US20100151966A1 - Golf ball and method of manufacturing the same - Google Patents
Golf ball and method of manufacturing the same Download PDFInfo
- Publication number
- US20100151966A1 US20100151966A1 US12/709,778 US70977810A US2010151966A1 US 20100151966 A1 US20100151966 A1 US 20100151966A1 US 70977810 A US70977810 A US 70977810A US 2010151966 A1 US2010151966 A1 US 2010151966A1
- Authority
- US
- United States
- Prior art keywords
- support pin
- accommodating hole
- golf ball
- pin accommodating
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14065—Positioning or centering articles in the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14819—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being completely encapsulated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/54—Balls
Definitions
- the present invention relates to a golf ball molding die and a golf ball manufactured by using the die. More particularly, it relates to an improvement of a die used for molding a golf ball.
- a golf ball is usually manufactured by an injection molding process or a compression molding process.
- an injection molding die is used.
- this injection molding die a spherical cavity is formed.
- a weld-mark such as a bird footprint is formed on the surface of the golf ball (weld defect).
- a defect called “burning” may be produced by adiabatic compression of gas in the cavity.
- a large venting hole is conventionally provided to dissipate the gas.
- the clearance between the pin and the hole must be made large, which results in the production of relatively large burrs on the surface of the golf ball.
- a full-scale burr treatment process must be introduced, so that there arises a problem of significantly increased manufacturing cost.
- Japanese Unexamined Patent Application Publication No. 2004-215684 has proposed a technique in which a plurality of convex parts and concave parts are formed alternately in the circumferential direction on the side surface of the support pin. Thereby, the clearance between the concave part and the accommodating hole is increased.
- this support pin has a problem of being easily broken as compared with the case where the convex parts and concave parts are absent.
- the present invention has been made in view of the above circumstances, and accordingly an object thereof is to provide a golf ball molding die that can produce a golf ball having a satisfactory surface condition by preventing the formation of burrs while a gas generated at the time of molding can be released to the outside smoothly and surely, and a golf ball manufactured by using the die.
- the present golf ball molding die comprises at least two die bodies within which a cavity for molding a golf ball is formed by jointing of the die bodies; and a pin accommodating hole provided in at least one of the die bodies, wherein at least one groove, such as a slit, communicating directly with the cavity is provided in the wall surface of the pin accommodating hole.
- the pin accommodating hole can be made a support pin accommodating hole in which a support pin for supporting the golf ball in the cavity advances and retreats.
- One of the grooves can be provided on the opposite side from the center of the cavity with the center of the support pin accommodating hole being positioned therebetween.
- the grooves can be formed at two or more locations, and the grooves can be provided at predetermined intervals in the circumferential direction of the pin accommodating hole.
- the depth of the groove can be made not shallower than about 5 ⁇ m and not deeper than about 0.1 mm.
- the golf ball is manufactured by using the die comprising at least two die bodies within which the cavity for molding the golf ball is formed by jointing of the die bodies; and the pin accommodating hole provided in at least one of the die bodies, wherein at least one groove communicating directly with the cavity is provided in the wall surface of the pin accommodating hole.
- FIG. 1 is a sectional view of a golf ball molding die in accordance with one embodiment of the present invention.
- FIG. 2 is a plan view of a die viewed in the direction of the arrows A-A of FIG. 1 .
- FIG. 3 is an enlarged plan view of a support pin accommodating hole shown in FIG. 2 .
- FIG. 4 is an enlarged sectional view of a support pin accommodating hole viewed in the direction of the arrows B-B of FIG. 3 .
- FIG. 5 is an enlarged plan view of a support pin accommodating hole in accordance with another embodiment.
- FIG. 6 is an enlarged plan view of a support pin accommodating hole in accordance with still another embodiment.
- FIG. 7 is an enlarged plan view of a support pin accommodating hole in accordance with still another embodiment.
- FIG. 8 is an enlarged plan view of a support pin accommodating hole in accordance with still another embodiment.
- FIG. 9 is an enlarged plan view of a support pin accommodating hole in accordance with still another embodiment.
- an injection molding die 1 for example, as shown in FIG. 1 is used.
- This injection molding die 1 comprises an upper die 2 and a lower die 3 that are made of a metal.
- a spherical cavity 4 is formed in the die 1 .
- a two-piece solid golf ball is manufactured by molding a cover around a rubber elastic body.
- a large number of protrusions (not shown) for forming dimples on the ball surface (cover surface) are provided.
- a division plane PL of the upper die 2 and the lower die 3 is located at a position corresponding to the equator of the cavity 4 .
- three support pin accommodating holes 19 extending in the direction perpendicular to the division plane PL of the die 1 are provided.
- a support pin 6 for supporting a rubber elastic body (solid core) 5 is disposed so as to advance and retreat. By advancing these support pins 6 into the cavity 4 , the rubber elastic body 5 having been molded in advance in a separate process can be held in the central part of the cavity 4 . Further, at positions corresponding to the North Pole and the South Pole of the cavity 4 , a gas vent pin 10 for releasing a gas and an accommodating hole 9 for accommodating the gas vent pin 10 are provided.
- a ring-shaped runner 12 is provided so as to surround the equator of the cavity 4 .
- a plurality of molding material pouring gates 13 that are open into the cavity 4 are provided at equal intervals along the circumferential direction in the inner peripheral part of the ring-shaped runner 12 .
- a cover material whose main constituent is an ordinary thermoplastic resin is supplied by injection through the molding material pouring gates 13 . Immediately before the finish of injection of the cover material, the tip ends of the support pins 6 for supporting the rubber elastic body retreat to the level of the cavity wall surface 7 , and the injection molding is finished.
- a plurality of ejector pins 14 that can be raised and lowered in the direction perpendicular to the division plane PL are provided at plural locations. After molding, when the resin having cured in the runner 12 adheres to the interior of the die 1 and is difficult to separate, by raising these ejector pins 14 , a pressure is applied, by which mold release can be accomplished easily.
- the difference in diameter between the gas vent pin 10 and the accommodating hole 9 therefor is usually set at about 40 ⁇ m, and the difference in diameter between the support pin 6 and the accommodating hole 19 therefor is usually set at about 25 ⁇ m. Also, the difference in diameter between the ejector pin 14 and the accommodating hole 15 therefor is usually set at about 25 ⁇ m.
- the air that is present in the gap between the wall surface 7 of the cavity 4 and the rubber elastic body 5 and the volatile constituent such as a gas released mixedly with the resin are discharged to the outside of the die 1 through the gap between the gas vent pin 10 and the gas vent pin accommodating hole 9 .
- the air and the volatile constituent are also discharged to the outside of the die 1 through the gap between the support pin 6 and the support pin accommodating hole 19 .
- FIG. 3 is an enlarged plan view of the support pin accommodating hole 19 provided in the golf ball molding die 1 shown in FIG. 1 .
- a slit 16 a In the wall surface 20 of the support pin accommodating hole 19 is provided a slit 16 a.
- This slit 16 a has a shape depressed to the outside of the support pin accommodating hole 19 .
- the two side walls of the slit 16 a are formed on the straight lines radiating from the center O of the support pin accommodating hole 19 .
- the back wall of the slit 16 a is formed on the concentric circle of the support pin accommodating hole 19 .
- Symbol P denotes the direction toward the center of the cavity 4 .
- the slit 16 a is provided on the opposite side from the center of the cavity 4 with the center O of the support pin accommodating hole 19 being positioned between the slit 16 a and the cavity center.
- the clearance between the wall surface 20 of the support pin accommodating hole 19 and the support pin 6 is preferably as small as possible.
- the upper limit of the clearance between the wall surface 20 of the support pin accommodating hole 19 and the support pin 6 is preferably about 30 ⁇ m, further preferably about 25 ⁇ m.
- the lower limit thereof is preferably about 10 ⁇ m, further preferably about 15 ⁇ m.
- the lower limit of the depth of the slit 16 is preferably about 5 ⁇ m.
- the upper limit thereof is preferably about 0.1 mm, further preferably about 80 ⁇ m.
- FIG. 4 is an enlarged sectional view showing a part of the lower die 3 forming the die 1 shown in FIG. 1 .
- the support pin 6 supports the rubber elastic body 5 .
- the support pin 6 is tilted slightly in the direction Q opposite to the direction P toward the center of the cavity 4 by the weight of the rubber elastic body 5 . Therefore, the clearance in the direction Q between the support pin 6 and the support pin accommodating hole 19 decreases.
- the air and gas can be discharged through the slit 16 a provided in the direction Q as viewed from the center 0 of the support pin accommodating hole 19 .
- the number and shape of the slits are not limited to those shown in FIG. 3 .
- a variation explained below can be employed.
- FIG. 5 is an enlarged plan view of the support pin accommodating hole 19 comprising slits 16 a, 16 b and 16 c.
- This support pin accommodating hole 19 differs from the accommodating hole 19 shown in FIG. 3 in that the slits 16 b and 16 c are provided additionally.
- the slit 16 b is provided at a position moving through 90 degrees clockwise around the center O at the periphery of the support pin accommodating hole 19 from the slit 16 a .
- the slit 16 c is provided on the opposite side from the slit 16 b with the center O being positioned therebetween. That is to say, the space between the slit 16 a and the slit 16 b is equal to the space between the slit 16 a and the slit 16 c.
- FIG. 6 is an enlarged plan view of the support pin accommodating hole 19 comprising a slit 17 a.
- FIG. 6 shows the support pin accommodating hole 19 in which the slit 16 a shown in FIG. 3 is replaced with the slit 17 a.
- the slit 17 has a shape in which the corner parts of the slit 16 are rounded.
- FIG. 7 is an enlarged plan view of the support pin accommodating hole 19 comprising a plurality of slits 17 , that is, slits 17 a, 17 b and 17 c.
- the slit 17 is preferable because it can be formed easily.
- FIG. 8 is an enlarged plan view of the support pin accommodating hole 19 comprising a slit 18 a.
- FIG. 8 shows the support pin accommodating hole 19 in which the slit 16 a shown in FIG. 3 is replaced with the slit 18 a.
- the wall of the slit 18 is formed into an arcuate shape.
- FIG. 9 is an enlarged plan view of the support pin accommodating hole 19 comprising a plurality of slits 18 , that is, slits 18 a, 18 b and 18 c.
- the inventive golf ball molding die To manufacture the inventive golf ball molding die, a method in which the die is directly cut three-dimensionally by using three-dimensional CAD (Computer Aided Design) and three-dimensional CAM (Computer Aided Manufacturing) can be employed. Alternatively, wire machining or electrical discharge machining can also be performed.
- CAD Computer Aided Design
- CAM Computer Aided Manufacturing
- a golf ball manufactured by using the inventive golf ball molding die has a satisfactory surface condition because the formation of burrs can be prevented while air and volatile constituent are discharged through the slit 16 a.
Abstract
There are provided a golf ball molding die capable of manufacturing a golf ball having a satisfactory surface condition, and a golf ball manufactured by using the die. The present golf ball molding die comprises at least two die bodies within which a cavity for molding a golf ball is formed by jointing of the die bodies; and a pin accommodating hole provided in at least one of the die bodies, and is characterized in that at least one groove communicating directly with the cavity is provided in the wall surface of the pin accommodating hole.
Description
- This is a divisional of application Ser. No. 11/871,635 filed Oct 12, 2007. The entire disclosure of the prior application, application Ser. No. 11/871,635 is hereby incorporated by reference.
- The present invention relates to a golf ball molding die and a golf ball manufactured by using the die. More particularly, it relates to an improvement of a die used for molding a golf ball.
- A golf ball is usually manufactured by an injection molding process or a compression molding process. In the case of an injection molding process, an injection molding die is used. In this injection molding die, a spherical cavity is formed.
- When a golf ball is molded, air that is present in a gap between the wall surface of the cavity and a rubber elastic body, which is the core material for the golf ball, and a volatile constituent such as a gas released mixedly with a resin are discharged to the outside of the die through a gap between a support pin for supporting the golf ball in the cavity and a support pin accommodating hole.
- If the air and the volatile constituent such as a gas are not discharged well, what is called a weld-mark such as a bird footprint is formed on the surface of the golf ball (weld defect). Further, in some cases, a defect called “burning” may be produced by adiabatic compression of gas in the cavity. To prevent such defects, a large venting hole is conventionally provided to dissipate the gas. In this case, however, the clearance between the pin and the hole must be made large, which results in the production of relatively large burrs on the surface of the golf ball. As a result, a full-scale burr treatment process must be introduced, so that there arises a problem of significantly increased manufacturing cost.
- As another method for dissipating the gas, Japanese Unexamined Patent Application Publication No. 2004-215684 has proposed a technique in which a plurality of convex parts and concave parts are formed alternately in the circumferential direction on the side surface of the support pin. Thereby, the clearance between the concave part and the accommodating hole is increased. However, this support pin has a problem of being easily broken as compared with the case where the convex parts and concave parts are absent.
- The present invention has been made in view of the above circumstances, and accordingly an object thereof is to provide a golf ball molding die that can produce a golf ball having a satisfactory surface condition by preventing the formation of burrs while a gas generated at the time of molding can be released to the outside smoothly and surely, and a golf ball manufactured by using the die.
- To achieve the above object, the present golf ball molding die comprises at least two die bodies within which a cavity for molding a golf ball is formed by jointing of the die bodies; and a pin accommodating hole provided in at least one of the die bodies, wherein at least one groove, such as a slit, communicating directly with the cavity is provided in the wall surface of the pin accommodating hole.
- The pin accommodating hole can be made a support pin accommodating hole in which a support pin for supporting the golf ball in the cavity advances and retreats.
- One of the grooves can be provided on the opposite side from the center of the cavity with the center of the support pin accommodating hole being positioned therebetween.
- The grooves can be formed at two or more locations, and the grooves can be provided at predetermined intervals in the circumferential direction of the pin accommodating hole.
- The depth of the groove can be made not shallower than about 5 μm and not deeper than about 0.1 mm.
- Another aspect of the present invention is a golf ball. The golf ball is manufactured by using the die comprising at least two die bodies within which the cavity for molding the golf ball is formed by jointing of the die bodies; and the pin accommodating hole provided in at least one of the die bodies, wherein at least one groove communicating directly with the cavity is provided in the wall surface of the pin accommodating hole.
-
FIG. 1 is a sectional view of a golf ball molding die in accordance with one embodiment of the present invention. -
FIG. 2 is a plan view of a die viewed in the direction of the arrows A-A ofFIG. 1 . -
FIG. 3 is an enlarged plan view of a support pin accommodating hole shown inFIG. 2 . -
FIG. 4 is an enlarged sectional view of a support pin accommodating hole viewed in the direction of the arrows B-B ofFIG. 3 . -
FIG. 5 is an enlarged plan view of a support pin accommodating hole in accordance with another embodiment. -
FIG. 6 is an enlarged plan view of a support pin accommodating hole in accordance with still another embodiment. -
FIG. 7 is an enlarged plan view of a support pin accommodating hole in accordance with still another embodiment. -
FIG. 8 is an enlarged plan view of a support pin accommodating hole in accordance with still another embodiment. -
FIG. 9 is an enlarged plan view of a support pin accommodating hole in accordance with still another embodiment. - A configuration of one embodiment of the present invention will now be described in detail by reference to the accompanying drawings.
- In the case where a golf ball is manufactured by an injection molding process, an
injection molding die 1, for example, as shown inFIG. 1 is used. This injection molding die 1 comprises anupper die 2 and alower die 3 that are made of a metal. By separably joining theupper die 2 and thelower die 3 to each other, aspherical cavity 4 is formed in the die 1. - As a specific example, the case where a two-piece solid golf ball is manufactured by molding a cover around a rubber elastic body is explained. As shown in
FIG. 1 , on acavity wall surface 7 of thedie 1, a large number of protrusions (not shown) for forming dimples on the ball surface (cover surface) are provided. A division plane PL of theupper die 2 and thelower die 3 is located at a position corresponding to the equator of thecavity 4. As shown inFIG. 2 , on thecavity wall surface 7, three supportpin accommodating holes 19 extending in the direction perpendicular to the division plane PL of thedie 1 are provided. These three holes are located at the vertexes of a regular triangle T whose center of gravity is the center axis of the cavity. In each of the supportpin accommodating holes 19, asupport pin 6 for supporting a rubber elastic body (solid core) 5 is disposed so as to advance and retreat. By advancing thesesupport pins 6 into thecavity 4, the rubberelastic body 5 having been molded in advance in a separate process can be held in the central part of thecavity 4. Further, at positions corresponding to the North Pole and the South Pole of thecavity 4, agas vent pin 10 for releasing a gas and anaccommodating hole 9 for accommodating thegas vent pin 10 are provided. - A ring-shaped runner 12 is provided so as to surround the equator of the
cavity 4. A plurality of moldingmaterial pouring gates 13 that are open into thecavity 4 are provided at equal intervals along the circumferential direction in the inner peripheral part of the ring-shaped runner 12. A cover material whose main constituent is an ordinary thermoplastic resin is supplied by injection through the moldingmaterial pouring gates 13. Immediately before the finish of injection of the cover material, the tip ends of thesupport pins 6 for supporting the rubber elastic body retreat to the level of thecavity wall surface 7, and the injection molding is finished. - Also, above the periphery of the ring-shaped runner 12 of the
die 1, a plurality ofejector pins 14 that can be raised and lowered in the direction perpendicular to the division plane PL are provided at plural locations. After molding, when the resin having cured in the runner 12 adheres to the interior of thedie 1 and is difficult to separate, by raising theseejector pins 14, a pressure is applied, by which mold release can be accomplished easily. - In the golf ball molding die, the difference in diameter between the
gas vent pin 10 and theaccommodating hole 9 therefor is usually set at about 40 μm, and the difference in diameter between thesupport pin 6 and theaccommodating hole 19 therefor is usually set at about 25 μm. Also, the difference in diameter between theejector pin 14 and theaccommodating hole 15 therefor is usually set at about 25 μm. When a golf ball is molded, the air that is present in the gap between thewall surface 7 of thecavity 4 and the rubberelastic body 5 and the volatile constituent such as a gas released mixedly with the resin are discharged to the outside of thedie 1 through the gap between thegas vent pin 10 and the gas vent pin accommodatinghole 9. Alternatively, the air and the volatile constituent are also discharged to the outside of thedie 1 through the gap between thesupport pin 6 and the supportpin accommodating hole 19. -
FIG. 3 is an enlarged plan view of the supportpin accommodating hole 19 provided in the golf ball molding die 1 shown inFIG. 1 . In thewall surface 20 of the supportpin accommodating hole 19 is provided aslit 16 a. Thisslit 16 a has a shape depressed to the outside of the supportpin accommodating hole 19. The two side walls of theslit 16 a are formed on the straight lines radiating from the center O of the supportpin accommodating hole 19. The back wall of theslit 16 a is formed on the concentric circle of the supportpin accommodating hole 19. Symbol P denotes the direction toward the center of thecavity 4. - The
slit 16 a is provided on the opposite side from the center of thecavity 4 with the center O of the supportpin accommodating hole 19 being positioned between theslit 16 a and the cavity center. - The clearance between the
wall surface 20 of the supportpin accommodating hole 19 and thesupport pin 6 is preferably as small as possible. Specifically, the upper limit of the clearance between thewall surface 20 of the supportpin accommodating hole 19 and thesupport pin 6 is preferably about 30 μm, further preferably about 25 μm. The lower limit thereof is preferably about 10 μm, further preferably about 15 μm. - The lower limit of the depth of the slit 16 is preferably about 5 μm. The upper limit thereof is preferably about 0.1 mm, further preferably about 80 μm.
-
FIG. 4 is an enlarged sectional view showing a part of thelower die 3 forming thedie 1 shown inFIG. 1 . As can be seen fromFIG. 4 , thesupport pin 6 supports the rubberelastic body 5. Thesupport pin 6 is tilted slightly in the direction Q opposite to the direction P toward the center of thecavity 4 by the weight of the rubberelastic body 5. Therefore, the clearance in the direction Q between thesupport pin 6 and the supportpin accommodating hole 19 decreases. However, the air and gas can be discharged through theslit 16 a provided in the direction Q as viewed from the center 0 of the supportpin accommodating hole 19. - The number and shape of the slits are not limited to those shown in
FIG. 3 . For example, a variation explained below can be employed. -
FIG. 5 is an enlarged plan view of the supportpin accommodating hole 19 comprisingslits pin accommodating hole 19 differs from theaccommodating hole 19 shown inFIG. 3 in that theslits - The
slit 16 b is provided at a position moving through 90 degrees clockwise around the center O at the periphery of the supportpin accommodating hole 19 from theslit 16 a. Theslit 16 c is provided on the opposite side from theslit 16 b with the center O being positioned therebetween. That is to say, the space between theslit 16 a and theslit 16 b is equal to the space between theslit 16 a and theslit 16 c. -
FIG. 6 is an enlarged plan view of the supportpin accommodating hole 19 comprising a slit 17 a.FIG. 6 shows the supportpin accommodating hole 19 in which theslit 16 a shown inFIG. 3 is replaced with the slit 17 a. The slit 17 has a shape in which the corner parts of the slit 16 are rounded.FIG. 7 is an enlarged plan view of the supportpin accommodating hole 19 comprising a plurality of slits 17, that is, slits 17 a, 17 b and 17 c. The slit 17 is preferable because it can be formed easily. -
FIG. 8 is an enlarged plan view of the supportpin accommodating hole 19 comprising a slit 18 a.FIG. 8 shows the supportpin accommodating hole 19 in which theslit 16 a shown inFIG. 3 is replaced with the slit 18 a. The wall of the slit 18 is formed into an arcuate shape.FIG. 9 is an enlarged plan view of the supportpin accommodating hole 19 comprising a plurality of slits 18, that is, slits 18 a, 18 b and 18 c. - To manufacture the inventive golf ball molding die, a method in which the die is directly cut three-dimensionally by using three-dimensional CAD (Computer Aided Design) and three-dimensional CAM (Computer Aided Manufacturing) can be employed. Alternatively, wire machining or electrical discharge machining can also be performed.
- A golf ball manufactured by using the inventive golf ball molding die has a satisfactory surface condition because the formation of burrs can be prevented while air and volatile constituent are discharged through the
slit 16 a. - The above is an explanation of specific embodiments of the inventive golf ball molding die. However, the present invention is not limited to the above-described embodiments. All changes and modifications that are apparent to those skilled in the art are embraced in the technical scope of the present invention. For example, the shapes of the support pin and support pin accommodating hole can be determined appropriately.
Claims (10)
1. A golf ball manufactured by using a golf ball molding die,
wherein the golf ball molding die comprises:
at least two die bodies within which a cavity for molding a golf ball is formed by jointing of the die bodies; and
a support pin accommodating hole provided in at least one of the die bodies,
wherein a support pin for supporting the golf ball in the cavity advances and retreats in the support pin accommodating hole,
wherein at least one groove communicating directly with the cavity is provided in the wall surface of the support pin accommodating hole, except a center-axis side of the wall surface.
2. The golf ball of claim 1 , wherein the grooves are formed at two or more locations, and the grooves are provided at predetermined intervals in the circumferential direction of the support pin accommodating hole.
3. The golf ball of claim 1 , wherein a depth of the groove is not shallower than about 5 μm and not deeper than about 0.1 mm.
4. The golf ball of claim 1 , wherein a clearance between the wall surface of the support pin accommodating hole and the support pin is not less than about 10 μm and not greater than about 25 μm.
5. The golf ball of claim 1 , wherein the at least one groove is selected from the following group consisting of:
a groove having side walls formed on the straight lines radiating from the center of the support pin accommodating hole, and the back wall of the groove is formed on a concentric circle of the support pin accommodating hole;
a groove having a back wall, the back wall being formed on a concentric circle of the support pin accommodating hole, wherein the groove has a shape in which the corner parts of the wall of the support pin accommodating hole and the back wall are rounded; and
a groove having a wall formed in an arcuate shape.
6. A method for manufacturing a golf ball, comprising:
molding a cover around a rubber elastic body by using a golf ball molding die, wherein the golf ball molding die comprises:
at least two die bodies within which a cavity for molding a golf ball is formed by jointing of the die bodies; and
a support pin accommodating hole provided in at least one of the die bodies, wherein a support pin for supporting the golf ball in the cavity advances and retreats in the support pin accommodating hole,
wherein at least one groove communicating directly with the cavity is provided in the wall surface of the support pin accommodating hole, except a center-axis side of the wall surface.
7. The method of manufacturing of claim 6 , wherein the grooves are formed at two or more locations, and the grooves are provided at predetermined intervals in the circumferential direction of the support pin accommodating hole.
8. The method of manufacturing of claim 6 , wherein the depth of the groove is not shallower than about 5 μm and not deeper than about 0.1 mm.
9. The method of manufacturing of claim 6 , wherein the clearance between the wall surface of the support pin accommodating hole and the support pin is not less than about 10 μm and not greater than about 25 μm.
10. The method of manufacturing of claim 6 , wherein the at least one groove is selected from the following group consisting of:
a groove having side walls formed on the straight lines radiating from the center of the support pin accommodating hole, and the back wall of the groove is formed on a concentric circle of the support pin accommodating hole;
a groove having a back wall, the back wall being formed on a concentric circle of the support pin accommodating hole, wherein the groove has a shape in which the corner parts of the wall of the support pin accommodating hole and the back wall are rounded; and
a groove having a wall formed in an arcuate shape.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/709,778 US20100151966A1 (en) | 2007-10-12 | 2010-02-22 | Golf ball and method of manufacturing the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/871,635 US7695264B2 (en) | 2007-10-12 | 2007-10-12 | Mold for forming golf ball |
US12/709,778 US20100151966A1 (en) | 2007-10-12 | 2010-02-22 | Golf ball and method of manufacturing the same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/871,635 Division US7695264B2 (en) | 2007-10-12 | 2007-10-12 | Mold for forming golf ball |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100151966A1 true US20100151966A1 (en) | 2010-06-17 |
Family
ID=40534772
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/871,635 Expired - Fee Related US7695264B2 (en) | 2007-10-12 | 2007-10-12 | Mold for forming golf ball |
US12/709,778 Abandoned US20100151966A1 (en) | 2007-10-12 | 2010-02-22 | Golf ball and method of manufacturing the same |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/871,635 Expired - Fee Related US7695264B2 (en) | 2007-10-12 | 2007-10-12 | Mold for forming golf ball |
Country Status (2)
Country | Link |
---|---|
US (2) | US7695264B2 (en) |
JP (1) | JP5364331B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013101807A1 (en) * | 2011-12-27 | 2013-07-04 | Nike International Ltd. | Golf ball with co-molded core and medial layer and method of making |
US8877110B2 (en) | 2011-12-27 | 2014-11-04 | Nike, Inc. | Method of molding a single-piece hollow shell including perforations |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8282376B2 (en) | 2009-06-12 | 2012-10-09 | Bridgestone Sports Co., Ltd. | Mold for forming golf ball and golf ball manufactured using the same |
US8926878B2 (en) | 2009-06-12 | 2015-01-06 | Bridgestone Sports Co., Ltd. | Golf ball and method for manufacturing the same |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3555620A (en) * | 1967-10-17 | 1971-01-19 | Harry R Bucy | Mold for pressure injected material vented through ejector pin guides |
US5803831A (en) * | 1993-06-01 | 1998-09-08 | Lisco Inc. | Golf ball and method of making same |
US5879599A (en) * | 1993-12-21 | 1999-03-09 | Bridgestone Sports Co., Ltd. | Method of molding golf balls |
US6050803A (en) * | 1996-12-19 | 2000-04-18 | Bridgestone Sports Co., Ltd. | Golf ball mold |
US20040058029A1 (en) * | 2002-09-19 | 2004-03-25 | Vargas Manuel G. | Golf ball core mold with improved ejector |
US6817852B2 (en) * | 2001-01-04 | 2004-11-16 | Callaway Golf Company | Direct cavity gate golf ball injection mold |
US20040251576A1 (en) * | 2003-06-11 | 2004-12-16 | Seiichiro Endo | Mold for golf ball |
US20050244530A1 (en) * | 2001-01-19 | 2005-11-03 | Acushnet Company | Apparatus and method for molding golf balls |
US20060269651A1 (en) * | 2005-05-25 | 2006-11-30 | Kabushiki Kaisha Toshiba | Metal mold apparatus |
US7201862B2 (en) * | 2003-08-29 | 2007-04-10 | Sri Sports Limited | Method of the production of a golf ball |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61235108A (en) * | 1985-04-12 | 1986-10-20 | Daiichi Kasei Kk | Structure of ejector mechanism for metal mold |
JPH03202333A (en) * | 1989-02-28 | 1991-09-04 | Citizen Watch Co Ltd | Injection molding device |
JPH05104530A (en) * | 1991-10-21 | 1993-04-27 | Matsushita Electric Works Ltd | Mold |
JP2990638B2 (en) * | 1993-09-09 | 1999-12-13 | ブリヂストンスポーツ株式会社 | Golf ball mold and golf ball |
JP4143778B2 (en) | 1998-07-23 | 2008-09-03 | ブリヂストンスポーツ株式会社 | Golf ball molding die and golf ball |
JP3716715B2 (en) * | 2000-07-10 | 2005-11-16 | 住友電装株式会社 | Pressure contact terminal fitting |
JP4614550B2 (en) | 2001-02-05 | 2011-01-19 | ブリヂストンスポーツ株式会社 | Golf ball mold and golf ball manufacturing method using the same |
JP2003190332A (en) | 2001-12-28 | 2003-07-08 | Bridgestone Sports Co Ltd | Solid golf ball |
JP2004042295A (en) * | 2002-07-09 | 2004-02-12 | Mitsumi Electric Co Ltd | Ejector pin for mold |
JP2004215684A (en) | 2003-01-09 | 2004-08-05 | Sumitomo Rubber Ind Ltd | Forming die for golf ball and manufacturing method for golf ball |
JP4259159B2 (en) * | 2003-03-27 | 2009-04-30 | 東海ゴム工業株式会社 | Molding die, method for producing elastic roll using the same, and elastic roll obtained thereby |
JP4327564B2 (en) * | 2003-11-12 | 2009-09-09 | Sriスポーツ株式会社 | Golf ball mold and golf ball manufacturing method |
JP2006304943A (en) | 2005-04-27 | 2006-11-09 | Yokohama Rubber Co Ltd:The | Die for molding golf ball and golf ball |
-
2007
- 2007-10-12 US US11/871,635 patent/US7695264B2/en not_active Expired - Fee Related
-
2008
- 2008-10-07 JP JP2008260492A patent/JP5364331B2/en not_active Expired - Fee Related
-
2010
- 2010-02-22 US US12/709,778 patent/US20100151966A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3555620A (en) * | 1967-10-17 | 1971-01-19 | Harry R Bucy | Mold for pressure injected material vented through ejector pin guides |
US5803831A (en) * | 1993-06-01 | 1998-09-08 | Lisco Inc. | Golf ball and method of making same |
US5879599A (en) * | 1993-12-21 | 1999-03-09 | Bridgestone Sports Co., Ltd. | Method of molding golf balls |
US6050803A (en) * | 1996-12-19 | 2000-04-18 | Bridgestone Sports Co., Ltd. | Golf ball mold |
US6817852B2 (en) * | 2001-01-04 | 2004-11-16 | Callaway Golf Company | Direct cavity gate golf ball injection mold |
US20050244530A1 (en) * | 2001-01-19 | 2005-11-03 | Acushnet Company | Apparatus and method for molding golf balls |
US20040058029A1 (en) * | 2002-09-19 | 2004-03-25 | Vargas Manuel G. | Golf ball core mold with improved ejector |
US20040251576A1 (en) * | 2003-06-11 | 2004-12-16 | Seiichiro Endo | Mold for golf ball |
US7201862B2 (en) * | 2003-08-29 | 2007-04-10 | Sri Sports Limited | Method of the production of a golf ball |
US20060269651A1 (en) * | 2005-05-25 | 2006-11-30 | Kabushiki Kaisha Toshiba | Metal mold apparatus |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013101807A1 (en) * | 2011-12-27 | 2013-07-04 | Nike International Ltd. | Golf ball with co-molded core and medial layer and method of making |
US8877110B2 (en) | 2011-12-27 | 2014-11-04 | Nike, Inc. | Method of molding a single-piece hollow shell including perforations |
Also Published As
Publication number | Publication date |
---|---|
JP2009095668A (en) | 2009-05-07 |
US20090098950A1 (en) | 2009-04-16 |
US7695264B2 (en) | 2010-04-13 |
JP5364331B2 (en) | 2013-12-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPH11137727A (en) | Mold for forming golf ball and golf ball | |
US9108347B2 (en) | Golf ball mold and golf ball manufacturing method | |
US8083977B2 (en) | Golf ball mold, golf ball and method of manufacturing a golf ball | |
US7695264B2 (en) | Mold for forming golf ball | |
US5458473A (en) | Molds for forming golf balls | |
JPH10258141A (en) | Production of golf ball using injection molding die | |
JP4327564B2 (en) | Golf ball mold and golf ball manufacturing method | |
JPH08308957A (en) | Manufacture of golf ball | |
JP2005305921A (en) | Molding mold | |
US7842220B2 (en) | Mold for forming golf ball and golf ball manufactured using the same | |
US20120329578A1 (en) | Mold for forming golf ball and golf ball manufactured using the same | |
US8267809B2 (en) | Mold for forming golf ball, method to manufacture golf ball with same, and golf ball manufactured using the same | |
JP2990638B2 (en) | Golf ball mold and golf ball | |
JP4143778B2 (en) | Golf ball molding die and golf ball | |
US7780887B2 (en) | Golf ball and die for molding the same | |
JP4614550B2 (en) | Golf ball mold and golf ball manufacturing method using the same | |
JP2010162350A (en) | Golf ball-molding tool and golf ball | |
JP4069376B2 (en) | Golf ball manufacturing method and golf ball | |
JPH09661A (en) | Golf ball molding and mold therefor | |
CN220741964U (en) | Injection molding structure for preventing uneven thickness of transition area | |
JP3636257B2 (en) | Golf ball injection mold | |
JPH09660A (en) | Golf ball molding and mold therefor | |
JP2004215684A (en) | Forming die for golf ball and manufacturing method for golf ball | |
JP2004058150A (en) | Complex molding metallic mold |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |