CN103105337A - Experimental device and method for effectively, simply and conveniently measuring dynamic bending resistance characteristic of knife handle - Google Patents
Experimental device and method for effectively, simply and conveniently measuring dynamic bending resistance characteristic of knife handle Download PDFInfo
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- CN103105337A CN103105337A CN2013100013238A CN201310001323A CN103105337A CN 103105337 A CN103105337 A CN 103105337A CN 2013100013238 A CN2013100013238 A CN 2013100013238A CN 201310001323 A CN201310001323 A CN 201310001323A CN 103105337 A CN103105337 A CN 103105337A
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Abstract
The invention discloses an experimental device and method for effectively, simply and conveniently measuring dynamic bending resistance characteristic of a knife handle. The experimental device comprises a machine tool, a main shaft, a pull rod, a rivet, the knife handle, an L-shaped knife rod and a laser vibration detection instrument, wherein the main shaft is fixedly mounted on the machine tool; the knife handle is connected with the rivet; the pull rod is used for tightly pulling the rivet, so that the knife handle is connected with the main shaft; the L-shaped knife rod is mounted on the knife handle; and the laser vibration detection instrument is used for emitting laser light onto the knife handle and detecting a displacement vibration signal of the knife handle. The laser vibration detection instrument is connected with a computer, so that data is displayed and output by an LMS (least mean square) modal test system in a computer; when the main shaft drives the knife handle to rotate at a high speed, the L-shaped knife rod generates a centrifugal force due to asymmetric structure, the force excitation on the knife handle is formed, and the load deformation of the knife handle is caused; a vibration signal of the knife handle can be detected by the laser vibration detection instrument, the data is read and output by utilizing LMS software, and the load deformation of the knife handle can be obtained; and a basis is provided for prediction of the cutting stability and structure optimization of the knife handle.
Description
Technical field
The present invention relates to experimental provision and the method for the dynamic transverse property of a kind of effective easy measurement handle of a knife, can accurately obtain the radial-deformation of handle of a knife under different rotating speeds and load, belong to Machine Design, manufacturing, field tests.
Background technology
The transverse property of handle of a knife test during high rotating speed, mainly by customize specific workpiece and three-dimensional dynamometer be used in conjunction with complete, be specially: workpiece is arranged on three-dimensional dynamometer, according to different cutting parameter processing works, three-dimensional dynamometer can be monitored the resistance to cutting of cutter in process, be the load of handle of a knife, detect the load deformation amount of handle of a knife by laser vibration measurer, can obtain the transverse property of handle of a knife.Although this method can obtain the transverse property that handle of a knife obtains handle of a knife under given conditions, due to the interference of the safety problem in test process and liquid coolant, laser vibration measurer can't effectively be worked, and has influence on obtaining of handle of a knife load deformation amount.In addition, this method of testing can't arrange load value in advance, can only assess according to the resistance to cutting that obtains immediately in process the transverse property of handle of a knife, and testing apparatus is expensive, and these factors make the research to the handle of a knife transverse property be restricted.
Summary of the invention
The object of the invention is to, estimate the deficiency of the method for handle of a knife transverse property for utilizing processing work and three-dimensional dynamometer, when a kind of effectively easy high rotating speed of measurement is provided, experimental provision and the method for handle of a knife transverse property, optimize test process by manufacturing and designing new experimental provision.Set the dimensions of L shaped knife bar according to D'Alembert's principle, pre-control is carried out in the handle of a knife load.The present invention can be effective, easy the transverse property of research handle of a knife.
The present invention adopts following technological means to realize:
The experimental provision of the dynamic transverse property of a kind of effective easy measurement handle of a knife comprises lathe 1, main shaft 2, pull bar 3, blind rivet 4, handle of a knife 5, L shaped knife bar 6, laser vibration measurer 7; Main shaft 2 is connected with an end of handle of a knife 5, and L shaped knife bar 6 is arranged on the other end of handle of a knife 5, and lathe 1 drives main shaft 2 rotations, and main shaft 2 drives L shaped knife bar 6 rotations by handle of a knife 5; By changing L shaped knife bar 6, change the handle of a knife load; Laser vibration measurer 7 is beaten laser on handle of a knife 5 and is guaranteed that laser beam is perpendicular to the axis of handle of a knife 5, displacement vibration signal for detection of handle of a knife 5, laser vibration measurer 7 is connected with computing machine, obtains the deflection of handle of a knife load under specific handle of a knife load by the LMS mode test macro in computing machine.
Handle of a knife 5 links together by pull bar 3 and blind rivet 4 with main shaft 2.
Changing L shaped knife bar 6 fingers changes specification or the quality of L shaped knife bar 6 or changes simultaneously specification and quality.
Changing the handle of a knife load can also obtain by the rotating speed that changes handle of a knife 5.
The method of the dynamic transverse property of a kind of effective easy measurement handle of a knife, specific as follows:
Handle of a knife load F
HComputing formula is as follows:
F
H＝mω
2(l/2+r)
Wherein, m is the quality of L shaped knife bar 6, and ω is the angular velocity that handle of a knife 5 rotates, and r is the radius of the horizontal knife bar of L shaped knife bar, and l is the vertical distance of knife bar proximal end face from the end face of the horizontal knife bar of L shaped knife bar to distance.
Beneficial effect
The present invention does not need to process specific workpiece, does not need the dynamometry instrument yet, has reduced cost, has simplified process of the test, has guaranteed the safety of test.Simultaneously, when the handle of a knife deflection of needs research certain loads, can be according to the dimensions of the L shaped knife bar of handle of a knife load calculation formula pre-adjustment, so test unit can be measured the dynamic transverse property of handle of a knife simple and effectively.
Description of drawings
Fig. 1 is connection diagram of the present invention;
Fig. 2 is L shaped knife bar schematic diagram;
Fig. 3 is handle of a knife-L shaped knife bar mechanics schematic diagram;
Fig. 4 is principle of the invention schematic diagram;
In figure: 1 is lathe, and 2 is main shaft, and 3 is pull bar, and 4 is blind rivet, and 5 is handle of a knife, and 6 is L shaped knife bar, and 7 is laser vibration measurer.
Embodiment
The invention will be further described below in conjunction with Figure of description 1-accompanying drawing 4:
The ultimate principle of the present embodiment is to get rid of workpiece and dynamometer, and set the L shaped knife bar of dimension according to actual conditions, variation by centrifugal force reaches the purpose that changes the handle of a knife load, thereby obtains simply and effectively the transverse property of handle of a knife under fast state.This experimental provision comprises the lathe 1 in Fig. 1, main shaft 2, pull bar 3, blind rivet 4, handle of a knife 5, L shaped knife bar 6, laser vibration measurer 7.L shaped knife bar 6 clampings are on handle of a knife 5, and handle of a knife 5 is connected with blind rivet 4, and are linked together by pull bar 3 and main shaft 2, and laser vibration measurer 7 is connected with computer.The transverse property of handle of a knife has determined the cutting stability of handle of a knife under the resistance to cutting effect in the process, processing effect there is conclusive impact, therefore the handle of a knife of certain model design prepare to put goods on the market before, need to compare research to the transverse property of handle of a knife, analyze Novel knife handle with respect to the advantage of other old type handle of a knifes on transverse property.Handle of a knife deflection test in the transverse property research process is generally to choose a cross section on handle of a knife, this cross-sectional distance main shaft end face is a certain predeterminable range, when handle of a knife is loaded the different loads rotation, detect the displacement vibration signal of this section, be the load deformation amount of handle of a knife.The present invention designs a kind of L knife bar, replaces universal cutter to be arranged on handle of a knife, when handle of a knife is static, utilizes laser vibration measurer that laser beam is beaten on handle of a knife point apart from a certain predeterminable range of main shaft end face perpendicular to the handle of a knife axis.When main shaft drive handle of a knife rotates with specific rotation speeds, L shaped knife bar is because its unsymmetric structure produces along handle of a knife centrifugal force radially, the loading of formation to handle of a knife, this loading is similar to the resistance to cutting in working angles, and calculate load value at this moment according to handle of a knife load calculation formula, handle of a knife produces load deformation under the excitation of this load, the load deformation amount will be sent in LMS software in computer by laser vibration measurer, namely can read the occurrence of handle of a knife load deformation amount by LMS software.Load value is combined with the load deformation amount and is depicted as two-dimensional coordinate figure, can know the transverse property of handle of a knife.
The relation of handle of a knife load and L shaped knife bar dimensions can calculate out according to D'Alembert's principle, with handle of a knife and L shaped knife bar as research object, force diagram as shown in Figure 3, the column balancing equation
F
H＝F
IR＝mψ
2(l/2+r) （1）
m＝ρπr
2l （2）
ω＝2πn （3）
F wherein
HThe expression handle of a knife is subject to the reacting force of L shaped knife bar, i.e. handle of a knife load; F
IRThe inertial force that represents L shaped knife bar, m represent that L shaped knife bar length is the quality of l section, and ρ is density, and r is the knife bar radius, and ω is the angular velocity that handle of a knife rotates, and n represents rotating speed.
With formula (2) (3) substitution formula (1) as can be known
F
H＝mω
2(l/2+r)＝4π
3ρn
2r
2l(l/2+r) （4）
In following formula, π and ρ are known constants, and r and l belong to the physical dimension of L shaped knife bar, the sizing of L shaped knife bar as shown in Figure 2, n is the handle of a knife rotating speed.
In order to obtain handle of a knife at specific rotation speeds n, different load F
HThe time transverse property, the material that can adjust L shaped knife bar is the length l of ρ, knife bar radius r or the vertical knife bar of L shaped knife bar, can calculate F before test
H, record the load deformation of handle of a knife at vibration measurement with laser after, load value is combined with the load deformation amount and is depicted as two-dimensional coordinate figure, can know the transverse property of handle of a knife, the approximating method of load value and load deformation amount is not construed as limiting.
It should be noted that at last: above embodiment is only in order to illustrate the present invention and unrestricted technical scheme described in the invention; Therefore, although this instructions has been described in detail the present invention with reference to each above-mentioned embodiment,, it will be understood by those of skill in the art that still and can modify or be equal to replacement the present invention; And all do not break away from technical scheme and the improvement thereof of the spirit and scope of invention, as change the loading experiment of the shape test other types of L shaped knife bar, and it all should be encompassed in the middle of claim scope of the present invention.
Claims (4)
1. the experimental provision of the dynamic transverse property of effective easy measurement handle of a knife, comprise lathe 1, main shaft 2, pull bar 3, blind rivet 4, handle of a knife 5, L shaped knife bar 6, laser vibration measurer 7; Main shaft 2 is connected with an end of handle of a knife 5, and L shaped knife bar 6 is arranged on the other end of handle of a knife 5, and lathe 1 drives main shaft 2 rotations, and main shaft 2 drives L shaped knife bar 6 rotations by handle of a knife 5; Laser vibration measurer 7 is beaten laser on handle of a knife 5 and is guaranteed that laser beam is perpendicular to the axis of handle of a knife 5, displacement vibration signal for detection of handle of a knife 5, laser vibration measurer 7 is connected with computing machine, obtains the deflection of handle of a knife load by the LMS mode test macro in computing machine.
2. the experimental provision of the dynamic transverse property of a kind of effective easy measurement handle of a knife according to claim 1 is characterized in that: handle of a knife 5 links together by pull bar 3 and blind rivet 4 with main shaft 2.
3. method based on the dynamic transverse property of effective easy measurement handle of a knife of the described device of claim 1 is characterized in that:
lathe 1 is by main shaft 2, handle of a knife 5 drives L shaped knife bar 6 and rotates, change the specification of L shaped knife bar 6, perhaps quality, the perhaps rotating speed of handle of a knife 5, the perhaps combination in any between them, thereby change the handle of a knife load, then under specific handle of a knife load, laser vibration measurer 7 is beaten laser on handle of a knife 5 and is guaranteed that laser beam is perpendicular to the axis of handle of a knife 5, detect the displacement vibration signal of handle of a knife 5, laser vibration measurer 7 is connected with computing machine, obtain the deflection of handle of a knife load under specific handle of a knife load by the LMS mode test macro in computing machine, take the handle of a knife load as horizontal ordinate, the load deformation amount of handle of a knife is the transverse property figure that ordinate can be drawn handle of a knife, obtain the transverse property of handle of a knife.
4. the method for the dynamic transverse property of a kind of effective easy measurement handle of a knife according to claim 3, is characterized in that: described handle of a knife load F
HComputing formula is as follows:
F
H＝mω
2(l/2+r)
Wherein, m is the quality of L shaped knife bar 6 vertical knife bars, and ω is the angular velocity that handle of a knife 5 rotates, and r is the radius of the horizontal knife bar of L shaped knife bar, and l is the vertical distance of knife bar proximal end face from the end face of the horizontal knife bar of L shaped knife bar to distance.
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| CN201310001323.8A CN103105337B (en) | 2013-01-05 | 2013-01-05 | Experimental device and method for effectively, simply and conveniently measuring dynamic bending resistance characteristic of knife handle |
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| CN103105337B CN103105337B (en) | 2015-01-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115070096A (en) * | 2022-08-16 | 2022-09-20 | 成都航空职业技术学院 | Vibration reduction method of milling cutter |
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| JP2012166303A (en) * | 2011-02-14 | 2012-09-06 | Kira Corporation:Kk | Main spindle device |
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2013
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| US4478538A (en) * | 1982-04-23 | 1984-10-23 | Yoshiaki Kakino | Device for detecting tool abnormality |
| JP2012166303A (en) * | 2011-02-14 | 2012-09-06 | Kira Corporation:Kk | Main spindle device |
| CN102207420A (en) * | 2011-03-15 | 2011-10-05 | 清华大学 | Device and method for testing static and dynamic properties of joint face of main shaft and shank |
| CN102445317A (en) * | 2011-09-23 | 2012-05-09 | 北京工业大学 | Experimental apparatus for accurately measuring characteristic parameters of tool holder-main shaft combined part |
| CN102620921A (en) * | 2012-03-16 | 2012-08-01 | 北京工业大学 | Double-side locking tool handle-main shaft dynamic performance experimental device capable of regulating tool tension |
Non-Patent Citations (4)
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|---|
| A.ERTURK等: "Selection of design and operational parameters in spindle–holder–tool assemblies for maximum chatter stability by using a new analytical model", 《INTERNATIONAL JOURNAL OF MACHINE TOOLS AND MANUFACTURE》 * |
| E. BUDAK等: "A Modeling Approach for Analysis and Improvement of Spindle-Holder-Tool Assembly Dynamics", 《MANUFACTURING TECHNOLOGY》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115070096A (en) * | 2022-08-16 | 2022-09-20 | 成都航空职业技术学院 | Vibration reduction method of milling cutter |
| CN115070096B (en) * | 2022-08-16 | 2022-10-25 | 成都航空职业技术学院 | Vibration reduction method for milling cutter |
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| CN103105337B (en) | 2015-01-07 |
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