DE3202219A1 - Active pressing mould with pressing pressure acting on four sides of the moulding material for the production of highly compacted, low-texture pressed parts - Google Patents
Active pressing mould with pressing pressure acting on four sides of the moulding material for the production of highly compacted, low-texture pressed partsInfo
- Publication number
- DE3202219A1 DE3202219A1 DE19823202219 DE3202219A DE3202219A1 DE 3202219 A1 DE3202219 A1 DE 3202219A1 DE 19823202219 DE19823202219 DE 19823202219 DE 3202219 A DE3202219 A DE 3202219A DE 3202219 A1 DE3202219 A1 DE 3202219A1
- Authority
- DE
- Germany
- Prior art keywords
- pressing
- molding compound
- press
- mold
- texture
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/007—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a plurality of pressing members working in different directions
Abstract
Description
Bezeichnung: Aktive Preßform mit iseitiger Preßdruckbeaufschlagung der Preßmasse zur Merstellung hochverdichteter, texturarmer Preßlinge Die Erfindung betrifft eine Preßform zum Herstellen von hochverdichteten, texturarmen Preßlingen aus pulvrigen bis körnigen Stoffgemengen, bestehend aus ini wesentlichen vier, paarweise identischen beweglichen Formteilen, die so gestaltet sind, daß sie beim Einwirken einer äußeren Kraft in der Weise in- und übereinander gleiten, daß sich das Innenvolumen der Preßform kontinuierlich verkleinert und die darin befind liebe Preßmasse von 4 Seiten komprimiert wird, wobei die inaktiven oberen und unteren Deckplatten (Spiegelpiatten) der Preßform ein Ausweichen der Preßmasse in Richtung senkrecht zur Preßdruckeinwirkung verhindern.Designation: Active mold with pressure on the side the molding compound for the production of high-density, low-texture compacts The invention relates to a mold for producing high-density, low-texture compacts From powdery to granular mixtures of substances, consisting of essentially four, in pairs identical movable moldings, which are designed so that they act upon an external force slide in and over each other in such a way that the internal volume the mold is continuously reduced and the dear molding compound in it 4 sides are compressed, whereby the inactive upper and lower cover plates (mirror plates) of the mold, the molding compound gives way in the direction perpendicular to the action of the molding pressure impede.
Die Verdichtung von Preßmasse zu Preßlingen erfolgt beim "einseitigen" Pressen dadurch, daß der Preßstempel in die 5seitig geschlossene Preßform eintaucht, wodurch sich deren Innenvolumen verkleinert. Ticrl)ei wird die in der Preßform befindliche Preßmasse en@lüftel und durch Kornumlagerung in eine dichtere Packung gezwungen. Da die den Preßstempel berühren den Preßmassepar t ikel beim Verd i ehten den größten, d.h. einen dem Stempel hub entsprechenden Weg in der Preßform zurücklegen, wäbrend die an der gegenüberliegenden inaktiven Seite der Preßform befindlichen Partikel ihre Lage nicht verändern, kommt es, besonders ausgeprägt bei hohen Fornlaten, infolge der unterschiedlichen Relativbewegung der Preßmassepartikel in Bezug auf die Formseitenwände zu einer inhomogenen Verdichtung des Preßlings, die durch die Reibung der Partikel, die mit den Preßform-Seitenwänden Kontakt haben, zusätzlich beeinflußt wird.The compression of molding compound to compacts takes place in the "one-sided" Pressing in that the ram dips into the 5-sided closed mold, whereby their internal volume is reduced. Ticrl) ei becomes the one in the mold Pressing compound en @ lüftel and forced into a denser packing by grain rearrangement. Since the press ram touches the molding compound particle when thickening the largest, i.e. cover a path in the die corresponding to the punch stroke, while the particles located on the opposite inactive side of the mold do not change their position, it happens as a result, especially in the case of high formats the different relative movement of the molding compound particles in relation to the mold side walls to an inhomogeneous compression of the compact, which is caused by the friction of the particles, which are in contact with the side walls of the mold, is additionally influenced.
Hierdurch entstehen die bekannten pyramidenförmigen Preßtexturen, wobei der hochverdichtete Kern, auch Preßkegel genannt, mit seiner Grundfläche dem Preßstempel zugewendet ist und der von immer schwächer verdichteten Zonen in Richtung auf die inaktiven Preßformwände umgeben wird. Einseitig verdichtete Preßlinge weisen daher, insbesondere bei höheren Formaten, eine abnehmende Verdichtung über die Preßlingshöhe auf, wodurch die Qualität der Preßlinge beeinträchtigt wird.This creates the well-known pyramid-shaped pressed textures, where the high-density core, also called press cone, with its base area The ram is facing and that of increasingly weaker compacted zones in the direction is surrounded on the inactive mold walls. Pressings compacted on one side show therefore, especially with larger formats, a decreasing compression over the height of the compact on, whereby the quality of the compacts is impaired.
Beim doppelseitigen Pressen, d.h. mit 2 aktiven Preßstempeln in einer vierseitig geschlossenen Preßform entstehen im Preßling zwei Preßkegel, die mit den Spitzen aufeinander stehen. Die Zone geringster Verdichtung, auch neutrale Zone genannt, ist eine Fläche senkrecht zur Preßrichtung und liegt beim gleichem ilub des Ober- und Unterstempels in der Preßlingsmitte. Die Textur im doppelseitig geprcßten Preßling entspricht im Oberteil bis zur neutralen one der eines einseitig gepreßten Preßlings und wiederholt sich dann spiegelbildlich im Preßlingsunterteil, d,h. die Ober- und Unterseite des Preßlings weisen die gleiche Verdichtung auf, was eine Qualitätsverbesserung gegenüber dem einseitigen Pressen bedeutet. Das doppelseitige Preßverfahren wird daher vornehmlich für höherwertige Produkte verwendet.With double-sided pressing, i.e. with 2 active press rams in one Four-sided closed mold results in two press cones in the pressed part, which with the tips stand on top of each other. The zone of least compression, also neutral zone called, is a surface perpendicular to the direction of pressing and is at the same ilub of the upper and lower punch in the middle of the pressed part. The texture in the double-sided pressed The compact corresponds in the upper part to a neutral one that is pressed on one side Pressings and then repeats itself in mirror image in the lower part of the pressing, d, h. the Top and bottom of the compact have the same compression, what a Means quality improvement compared to one-sided pressing. The double-sided The pressing process is therefore mainly used for higher quality products.
Höchstwertige, nahezu texturfreie Produkte mit fast homogener Dichteverteilung sind nur im isostatischell Preßverfahren herzustellen, bei dem der Preßdruck allseitig in gleicher ;iöhe auf den Preßling einwirkt.High quality, almost texture-free products with almost homogeneous density distribution can only be produced using the isostatic pressing process, in which the pressing pressure is applied on all sides acts in the same amount on the pressed part.
Diescs Verfahren eignet sich aber in allgemeinen nicht zur Fertigung von Massenartikeln (Ausnahmen sind z.B. Zündkerzenisolatoren und Mahlkörper), da os zu kosten-, lohn-, zeit- und kapitalintensiv ist und außerdem in den meisten Fällen eine Nachbearbeitung der Preßlingsoberfläche erforderlich wird.However, this method is generally not suitable for production of mass-produced articles (exceptions are e.g. spark plug insulators and grinding media), there os is too cost, wage, time and capital intensive and also in most Cases reworking of the compact surface is necessary.
Die Erfindung füllt die technologische Lücke zwischen dem zweiseitigen und isostatischen Pressen aus, indem sie durch "vierseitige" Preßdruckeinwirkung auf das Preßmaterial zu einer erheblichen Verminderung der Texturbildung und Erhöhung der Homogenität führt, ohne die einfache handhabung mechanischer Preßformen einzubüßen, wie es beim isostatischen Pressen der Fall ist. Auch eine Nachbearbeitung der Oberflächen cntfällt.The invention fills the technological gap between the two-sided and isostatic pressing made by applying "four-sided" pressing pressure on the molding material to a considerable reduction in texture formation and increase leads to homogeneity without losing the ease of use of mechanical compression molds, as is the case with isostatic pressing. Also a post-processing of the surfaces not applicable.
Die Einordnung der Erfindung in die verschiedenen Preßsysteme geht
aus der nachfolgenden Aufstellung hervor, wobei als Beispiel für eine Preßkörpergestalt
ein Kubus gewählt ist:
L e e r s e i t eL e r s e i t e
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823202219 DE3202219A1 (en) | 1982-01-25 | 1982-01-25 | Active pressing mould with pressing pressure acting on four sides of the moulding material for the production of highly compacted, low-texture pressed parts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19823202219 DE3202219A1 (en) | 1982-01-25 | 1982-01-25 | Active pressing mould with pressing pressure acting on four sides of the moulding material for the production of highly compacted, low-texture pressed parts |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3202219A1 true DE3202219A1 (en) | 1983-08-11 |
Family
ID=6153825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19823202219 Withdrawn DE3202219A1 (en) | 1982-01-25 | 1982-01-25 | Active pressing mould with pressing pressure acting on four sides of the moulding material for the production of highly compacted, low-texture pressed parts |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3202219A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8704860U1 (en) * | 1987-04-01 | 1987-09-17 | Dischler, Helmut, Dipl.-Ing., 4040 Neuss, De | |
US6660197B1 (en) | 1999-10-13 | 2003-12-09 | Novo Nordisk A/S | Method for producing an elongated drug formation |
-
1982
- 1982-01-25 DE DE19823202219 patent/DE3202219A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8704860U1 (en) * | 1987-04-01 | 1987-09-17 | Dischler, Helmut, Dipl.-Ing., 4040 Neuss, De | |
US6660197B1 (en) | 1999-10-13 | 2003-12-09 | Novo Nordisk A/S | Method for producing an elongated drug formation |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8130 | Withdrawal |