EP0403040B1 - Verfahren und Vorrichtung zur Herstellung masshaltiger Presslinge - Google Patents
Verfahren und Vorrichtung zur Herstellung masshaltiger Presslinge Download PDFInfo
- Publication number
- EP0403040B1 EP0403040B1 EP90250140A EP90250140A EP0403040B1 EP 0403040 B1 EP0403040 B1 EP 0403040B1 EP 90250140 A EP90250140 A EP 90250140A EP 90250140 A EP90250140 A EP 90250140A EP 0403040 B1 EP0403040 B1 EP 0403040B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressing force
- tolerance band
- pressing
- travel
- press
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0094—Press load monitoring means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- 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
- B30B11/005—Control arrangements
Definitions
- the invention relates to a method for producing dimensionally stable compacts from pulverulent compositions according to the preamble of claim 1 and an apparatus for performing this method.
- DE 29 51 716 C2 discloses a method for pressing shaped articles with at least one step made of metal powder, with which shaped articles of constant height and density can be produced.
- the course of the pressing force of the ram is measured depending on the path and stored and compared with predetermined path-dependent setpoints.
- the height accuracy of the compacts is ensured by mechanical stops and the permanently adjustable stroke of the upper punch.
- the constant density is made possible within certain accuracy limits by the fact that the filling volume of the mold is reduced in the next working cycle when the comparison of the pressing force has shown that the setpoint has been exceeded. If the value falls below the setpoint, the procedure is reversed.
- the object of the invention is therefore to provide a method and a device for carrying it out which permits even tighter tolerances with regard to the shape accuracy of the compacts and at the same time further reduces the risk of rejects production.
- the basis of the invention is the knowledge that the accuracy of the molded part of a compact made from a powder material does not depend solely on the fact that the upper and lower dies which shape the mold are brought into a position in which their pressing surfaces are at a relative distance from one another that of the one to be produced Correspond to compacts.
- Each compact is in fact elastic to a certain extent, so it springs open after being molded out of the mold.
- the size of this suspension depends on the density of the compact and thus indirectly on the applied pressing force. In principle, the larger the press force, the stronger the spring-up. However, the relationship between density and pressing force is not linear and depends on the powder material used. If, in the production of compacts of identical shape per se, the press punches are brought into exactly the same position in relation to one another in the press end position, it is therefore in no way ensured that two compacts of exactly the same size also result. If one uses a greater pressing force than the other due to the greater bulk density of the powder filling, different parts will result in any case because the springing after the molding has been formed must be different.
- the invention has made use of this knowledge by providing that the spring deflection of the molded part is taken into account in the final determination of the end position of the press ram in the press end position.
- the applied pressing force must be measured on the stamp in question and a spring travel must be determined at this point in accordance with the spring characteristic of the compact (for example, in the case of a stepped compact at every height step).
- the greater the expected spring deflection the closer the pressing surfaces of opposing punches must be moved to each other.
- the course of the pressing force depending on the travel path of at least one, in the extreme case of each punch, which is to produce a dimensionally accurate part of the compact is detected and compared with a path-dependent tolerance band.
- a second path-dependent tolerance band of the pressing force can be provided for the press rams in question, when the latter leaves the control, a corresponding compensating change in the filling volume of the press mold is initiated in the next working cycle.
- this second tolerance band is wider than the first and completely covers it. In this way, even greater changes in the bulk density of the powder filling can be compensated for in their effects on the compact geometry.
- an even wider path-dependent tolerance band of the pressing force can be provided, the press of which is switched off when it is left. If the maximum permissible pressing force is exceeded, cold welding of punches, for example, may have been the cause, so that greater tool damage is avoided by stopping the press. Conversely, if the pressure drops below the minimum, the mold may have been filled insufficiently or not at all, for example due to a disturbance in the powder supply, so that even in such a case the press must be switched off in order to avoid damage to the mold.
- the iron powder 2 filled into a die 1 is compressed with an upper punch 3 and a lower punch 4 until the distance between the upper punch 3 and the lower punch 4 corresponds to the height of the pressed part 2 to be produced.
- This state is shown in Figure 1.
- a pressing force results, to which a specific springing of the pressing part 2 can be assigned, which occurs when the pressing part 2 is exposed from the mold.
- the curve of the pressing force as a function of the spring deflection has been determined in previous experiments for the iron powder used. As a rule, this curve can be linearized with sufficient approximation in the section relevant to the tolerance band.
- the punches 3 and 4 are moved towards each other by the amount of this spring. With this procedure, after the pressing part 2 has been exposed, the springing that occurs exactly gives the height of the pressing part 2 that was required (FIG. 3).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
- Press Drives And Press Lines (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90250140T ATE96732T1 (de) | 1989-06-15 | 1990-05-31 | Verfahren und vorrichtung zur herstellung masshaltiger presslinge. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3919847 | 1989-06-15 | ||
DE3919847A DE3919847A1 (de) | 1989-06-15 | 1989-06-15 | Verfahren und vorrichtung zur herstellung masshaltiger presslinge |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0403040A2 EP0403040A2 (de) | 1990-12-19 |
EP0403040A3 EP0403040A3 (de) | 1991-03-06 |
EP0403040B1 true EP0403040B1 (de) | 1993-11-03 |
Family
ID=6382959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90250140A Expired - Lifetime EP0403040B1 (de) | 1989-06-15 | 1990-05-31 | Verfahren und Vorrichtung zur Herstellung masshaltiger Presslinge |
Country Status (5)
Country | Link |
---|---|
US (1) | US5024811A (ja) |
EP (1) | EP0403040B1 (ja) |
JP (1) | JPH082519B2 (ja) |
AT (1) | ATE96732T1 (ja) |
DE (2) | DE3919847A1 (ja) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3609107B2 (ja) * | 1992-11-20 | 2005-01-12 | インターメタリックス株式会社 | 圧粉成形体成形方法及び装置 |
WO1995014568A1 (en) * | 1993-11-24 | 1995-06-01 | Stackpole Limited | Phased split die |
WO1995014567A1 (en) * | 1993-11-24 | 1995-06-01 | Stackpole Limited | Undercut split die |
US6440357B1 (en) | 1996-05-09 | 2002-08-27 | Stackpole Limited | Compacted-powder opposed twin-helical gears and method |
US6165400A (en) * | 1996-05-09 | 2000-12-26 | Stackpole Limited | Compacted-powder opposed twin-helical gears and method |
DE19728767C1 (de) * | 1997-07-07 | 1999-01-07 | Forschungszentrum Juelich Gmbh | Preßwerkzeug zum uniaxialen Kaltpressen von Pulverproben |
DE19854075A1 (de) * | 1998-11-24 | 2000-05-25 | Henkel Kgaa | Verfahren zur Serienfertigung von Formkörpern mit geringer Härteschwankung |
US6669891B1 (en) * | 1999-04-02 | 2003-12-30 | Midwest Brake Bond Company | Method and apparatus for producing brake lining material |
US6531090B2 (en) * | 2000-02-17 | 2003-03-11 | Sumitomo Special Metals Co., Ltd. | Method for producing powder compact and method for manufacturing magnet |
GB2360825B (en) * | 2000-03-30 | 2004-11-17 | Formflo Ltd | Gear wheels roll formed from powder metal blanks |
JP3687492B2 (ja) * | 2000-06-21 | 2005-08-24 | 株式会社村田製作所 | 誘電体ブロックのプレス成形方法 |
DE10142772C2 (de) * | 2001-08-31 | 2003-09-25 | Fette Wilhelm Gmbh | Verfahren zur Herstellung von Pressteilen in einer Pulverpresse |
DE10151858A1 (de) * | 2001-10-24 | 2003-05-08 | Dorst Masch & Anlagen | Verfahren zum Einstellen bzw. Überwachen eines Pressen-Werkzeugs und Pressen-Werkzeug bzw. Pressen-Steuereinrichtung dafür |
DE10301224A1 (de) * | 2003-01-15 | 2004-08-05 | Maschinenfabrik Lauffer Gmbh & Co Kg | Verfahren zur Endpositionsregelung einer Presse für maßgenaue Formkörper |
DE102009004620A1 (de) * | 2009-01-15 | 2010-07-22 | Gkn Sinter Metals Holding Gmbh | Verfahren zum Betrieb einer Pressvorrichtung zur Herstellung von Presslingen konstanter Höhe aus pulverförmigen Stoffen, Steuergerät für eine derartige Pressvorrichtung und Pressvorrichtung |
CN102548745B (zh) * | 2009-07-03 | 2014-12-10 | 三和系统工程株式会社 | 粉体的压缩成形方法及其装置 |
US9283693B2 (en) * | 2010-07-30 | 2016-03-15 | Lg Innotek Co., Ltd. | Hot press sintering apparatus and press element |
CN112170843B (zh) * | 2020-09-29 | 2023-01-31 | 中国航发动力股份有限公司 | 一种旋流器流道的激光选区熔化成形工艺模型确定方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3389432A (en) * | 1966-04-18 | 1968-06-25 | Cincinnati Shaper Co | Load indicating device for compacting press |
US3698843A (en) * | 1971-02-24 | 1972-10-17 | Nat Forge Co | High production isostatic molding device |
DE2951716A1 (de) * | 1979-12-19 | 1981-07-02 | Mannesmann AG, 4000 Düsseldorf | Verfahren und vorrichtung zum pressen von formkoerpern |
JPS57209797A (en) * | 1981-06-19 | 1982-12-23 | Toyota Motor Corp | Method and apparatus for controlling die position of liquid pressure type powder press |
JPS58215299A (ja) * | 1982-06-09 | 1983-12-14 | Nippon Piston Ring Co Ltd | 複合バルブシ−トの製造方法 |
JPS59183998A (ja) * | 1983-04-02 | 1984-10-19 | Hitachi Powdered Metals Co Ltd | 圧粉体の成形不良防止法 |
SE456458B (sv) * | 1983-07-12 | 1988-10-03 | Nobel Elektronik Ab | Reglerkrets |
US4570229A (en) * | 1983-09-19 | 1986-02-11 | Pennwalt Corporation | Tablet press controller and method |
DE3715077A1 (de) * | 1987-05-06 | 1988-12-01 | Netzsch Maschinenfabrik | Verfahren zum steuern einer presse |
-
1989
- 1989-06-15 DE DE3919847A patent/DE3919847A1/de active Granted
-
1990
- 1990-05-31 EP EP90250140A patent/EP0403040B1/de not_active Expired - Lifetime
- 1990-05-31 AT AT90250140T patent/ATE96732T1/de not_active IP Right Cessation
- 1990-05-31 DE DE90250140T patent/DE59003294D1/de not_active Expired - Lifetime
- 1990-06-13 JP JP2154970A patent/JPH082519B2/ja not_active Expired - Lifetime
- 1990-06-15 US US07/539,065 patent/US5024811A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE3919847C2 (ja) | 1991-03-28 |
DE3919847A1 (de) | 1990-12-20 |
EP0403040A3 (de) | 1991-03-06 |
EP0403040A2 (de) | 1990-12-19 |
JPH082519B2 (ja) | 1996-01-17 |
ATE96732T1 (de) | 1993-11-15 |
US5024811A (en) | 1991-06-18 |
JPH0327897A (ja) | 1991-02-06 |
DE59003294D1 (de) | 1993-12-09 |
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