EP1133374A1 - Verfahren zur herstellung eines gesinterten bauteils mit nachverformung des grünlings - Google Patents
Verfahren zur herstellung eines gesinterten bauteils mit nachverformung des grünlingsInfo
- Publication number
- EP1133374A1 EP1133374A1 EP99955898A EP99955898A EP1133374A1 EP 1133374 A1 EP1133374 A1 EP 1133374A1 EP 99955898 A EP99955898 A EP 99955898A EP 99955898 A EP99955898 A EP 99955898A EP 1133374 A1 EP1133374 A1 EP 1133374A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- green compact
- component
- sintered
- shape
- pressing
- 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.)
- Granted
Links
- 238000007493 shaping process Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims description 32
- 238000000465 moulding Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 5
- 241001522319 Chloris chloris Species 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 238000005520 cutting process Methods 0.000 abstract description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H5/00—Making gear wheels, racks, spline shafts or worms
- B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
- B21H5/022—Finishing gear teeth with cylindrical outline, e.g. burnishing
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
-
- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/08—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of toothed articles, e.g. gear wheels; of cam discs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
- B30B15/022—Moulds for compacting material in powder, granular of pasta form
-
- 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
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
- B22F3/164—Partial deformation or calibration
- B22F2003/166—Surface calibration, blasting, burnishing, sizing, coining
-
- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the invention relates to a method for producing a sintered component from powdery material, in particular from sintered metallurgical powder.
- this method can be used for any geometry without undercuts if the press tool is adapted to the contours accordingly.
- uniform compaction can only be achieved with bodies with surfaces which are oriented essentially perpendicular to the direction of movement of the pressing tools.
- the described method reaches its technical limits.
- regions with a lower material density can arise due to the low flowability of the powder, which can lead to material defects such as cracks or breaks during subsequent sintering. In the same way it can too Overstressing and thus breakage at such exposed parts of the press tool.
- Geometries or undercuts on the component are machined to achieve the desired final component shape.
- the object of the invention is to provide a method which avoids the disadvantages described above.
- the object is achieved by a method for producing a sintered component from powdery material, in particular from a sintered metallurgical powder, in which firstly a green compact is formed, which forms a basic component shape, and in which at least one subsequent non-cutting reshaping of partial areas on the Basic component shape, the desired final component shape is generated, which is then sintered.
- this method offers the advantage that the green body for the
- Basic component shape can be produced in a correspondingly simplified pressing tool designed for uniform compression. It is expedient if the basic component shape comes as close as possible to the geometry of the final component shape.
- the special final shape of the component is then brought about by at least one further separate reshaping of the relevant subregions of the green body with the aid of another reshaping tool.
- pressure is applied to the sub-areas to be reshaped in separate reshaping tools.
- the first pressing step less densified areas can still be found recompress.
- special geometries in the partial areas of the basic component shape that are difficult or impossible to form in the first pressing step can be reshaped.
- the forming tools are equipped with pressure and counter pressure media. With these procedures, an isostatic pressure component can be transferred to the partial areas to be reshaped in such a way that deformability is still possible even with very brittle material. By reshaping the relevant sections of the green compact, the final component shape is produced, which can then be sintered.
- the shaping can be carried out by pressing and / or rolling.
- the forming can in particular be carried out in stages, with individual contours, such as undercuts on the final component shape, each being generated by at least one U-shape stage.
- the forming depth is increased in stages. It is thereby achieved that larger forming work can be carried out without destroying the material structure.
- the green compact is presintered before at least one reshaping to increase the green strength.
- This joining, referred to as pre-sintering, of the powdery and pressed powder material is preferably carried out at a lower temperature than the high sintering which leads to the final shape of the component.
- the pre-sintering is carried out in such a way that further forming work on the component is still possible is.
- the internal structure of the molded part is largely retained in the areas that have already been finally shaped when forming partial areas and a higher pressure can be applied to these partial areas for the forming.
- the component can be calibrated as a green body before sintering and / or as a solidified part after sintering.
- at least part of the forming work is performed by calibration. This calibration allows the surface, but also the structure of the component, to be qualitatively improved. In particular, it is possible to remove burrs and / or pointed or sharp edges.
- FIG. 3 shows an end view of a die for producing the component according to FIG. 1,
- FIG. 5 shows the shape of the green compact formed in the pressing step according to FIG. 4,
- FIG. 8 is a perspective view of a toothed ring
- FIG. 9 shows an enlarged detail for a tooth of the toothed ring according to FIG. 8,
- FIG. 10 is a plan view of the detail according to FIG. 9,
- FIG. 14 shows the forming press process for FIG. 13.
- the pinion 1 is shown in longitudinal section, which has a cylindrical base body 2, which is provided at one end with an external toothing 3.
- the teeth 4 of the external teeth 3 are designed as so-called curved teeth.
- the component is sintered from a sintered metallurgical powder.
- the pressing tool essentially consists of an outer contour which essentially Send die 5, a lower punch 6 and an upper form punch 7.
- the lower punch 6 is first lowered for filling by a predetermined amount and the molding space thus formed is filled with sintered metallurgical powder 8.
- the die 7 is then lowered, the outer contour 9 of which essentially corresponds to the inner contour 10 of the upper region of the die 5.
- 3 shows an end view of the molding die 7 »
- the forming die 7 is inserted into the die 5 and at the same time the lower die 6 is moved upwards, so that the forming die and lower die are guided against one another and thereby compress the powder filling which has only been poured into a solid green compact 1.1.
- the cylindrical base body 2 already has its final shape, while the teeth 4 of the external toothing 3 already have the curved tooth course in their lower region 4.1 due to the corresponding shape of the die 5, while the upper region 4.2 has the contour of a normal straight toothing.
- the intermediate shape of the green compact thus produced can be seen from FIG. 5. It can also be seen here that after the forming die 7 has been lifted, the green compact 1.1 can be ejected from the die 5 through the lower die 6, since there is no undercut.
- the green compact 1.1 is inserted in a second work step into a die 5.1, which has a lower punch 6.1, and the shape space of which is essentially formed by a tooth-shaped space 11.1, the geometry of which corresponds to the area 4.1 on the green compact (Fig. 2) corresponds.
- An upper die-shaped pressing tool 5.2 is provided with a tooth-forming space 11.2, which is identical to the area 4.1 on the green compact (FIG. 5) and which serves to shape the area 4.2 on the green compact, which is still in the form of straight teeth, in such a way that this toothed area corresponds to the one shown in FIG. 1 like given the final contour.
- An inner punch 12 is assigned to the upper die-shaped tool 5.2, so that the lower punch 6.1 and the inner punch 12 can be guided when the entire tool arrangement is moved together so that, apart from the reshaping of the external toothing, there are no relative displacements of the green body between the two tools 5.1 and 5.2. This pressing situation is shown in Fig. 7.
- FIG. 8 shows in perspective a ring 13 with an external toothing 14 of the type used, for example, as a clutch body in a manual transmission.
- the individual teeth 15 of the external toothing 14 are not designed as normal straight teeth, but have a complicated geometric shape.
- the tooth flanks 15.1 are shaped as involute surfaces, but are at an angle to one another, as shown in FIG. 10.
- the end face 16 is in this case straight, while the end face 17 is formed by two flat areas 17.
- this component Since the plane of the pressing tool required to manufacture this component is oriented perpendicular to the axis A of the component, i. H. the required press rams are guided in the direction of the axis A, it can be seen in particular in FIG. 10 that such toothing cannot be formed with a simple compression ram due to the given undercut.
- the manufacture of this component can also be carried out in such a way that in a first molding step the ring body and the external toothing are formed with the end faces 17.1, so that the subsequent side faces 15.1 are still designed as "straight teeth".
- the final shaping of the tooth flanks 15.1 is then effected again on the green body already pressed using a die-shaped tool, not only the mutual inclination in the axial direction but also the involute surfaces being molded on.
- FIG. 11 shows a green compact 18 for a ring with internal teeth as a further design example.
- the green compact shown in FIG. 11 is produced as a basic component shape analogous to the method described with reference to FIGS. 2 and 4.
- FIG. 11 only one tooth 19 of the internal toothing is shown in a side view on an annular body 18.1 and in FIG. 12 several teeth 19 are shown in a development of the internal toothing in a top view.
- a green body contoured in this way can be produced in a first pressing step analogously to the illustration according to FIGS. 2 and 4 as the basic component shape, including the special contouring of the teeth 19.
- the application shown here for example, requires a tooth shape with undercuts, as shown in FIG. 13.
- This tooth shape can no longer be produced by a pure pressing process because of the undercuts 20 on both sides of the tooth flank.
- this is possible by means of a shaping process which - as indicated in FIG. 14 - is possible by rolling or rolling.
- the green compact 18 is held on a rotatable counter element 21, for example on a roller or in a support ring.
- the undercuts 20 are then produced with a correspondingly shaped rolling tool 22 as a pressure element, which rolls on the inner surface of the toothing when the counter element 21 rotates.
- the undercuts 20 are shown coarsened in FIG. 13. In practical use, these are only slight depressions compared to the adjacent areas of the tooth flanks.
- undercuts and designs can also be formed by forming, which cannot be produced in the "classic" pressing process.
- These are practically all shapes for which pressing forces are required, which run essentially transversely to the pressing direction, which are necessary for producing the basic component shape, for example according to FIGS. 3 and 4.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Ceramic Products (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19850326 | 1998-11-02 | ||
DE19850326A DE19850326A1 (de) | 1998-11-02 | 1998-11-02 | Verfahren zur Herstellung eines gesinterten Bauteils mit Nachverformung des Grünlings |
PCT/EP1999/008189 WO2000025960A1 (de) | 1998-11-02 | 1999-10-28 | Verfahren zur herstellung eines gesinterten bauteils mit nachverformung des grünlings |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1133374A1 true EP1133374A1 (de) | 2001-09-19 |
EP1133374B1 EP1133374B1 (de) | 2004-04-14 |
Family
ID=7886330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99955898A Expired - Lifetime EP1133374B1 (de) | 1998-11-02 | 1999-10-28 | Verfahren zur herstellung eines gesinterten bauteils mit nachverformung des grünlings |
Country Status (9)
Country | Link |
---|---|
US (1) | US6730263B2 (de) |
EP (1) | EP1133374B1 (de) |
JP (1) | JP2002528644A (de) |
AT (1) | ATE264153T1 (de) |
AU (1) | AU1266800A (de) |
CA (1) | CA2348429C (de) |
DE (2) | DE19850326A1 (de) |
ES (1) | ES2221459T3 (de) |
WO (1) | WO2000025960A1 (de) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1307199B1 (it) * | 1999-06-22 | 2001-10-29 | Mini Gears Spa | Procedimento per la realizzazione di ruote dentate da semilavoratiottenuti per sinterizzazione di polveri metalliche |
US6946012B1 (en) * | 2000-05-18 | 2005-09-20 | Fleetguard, Inc. | Filter and forming system |
DE10142805C2 (de) * | 2001-08-31 | 2003-10-16 | Gkn Sinter Metals Gmbh | Einteiliger Gelenkkörper |
DE10203283C5 (de) * | 2002-01-29 | 2009-07-16 | Gkn Sinter Metals Gmbh | Verfahren zur Herstellung von gesinterten Bauteilen aus einem sinterfähigen Material und gesintertes Bauteil |
DE102004002714B3 (de) * | 2004-01-19 | 2005-05-19 | SCHWäBISCHE HüTTENWERKE GMBH | Verfahren zum Leichtmetall-Legierungs-Sintern |
FR2866254B1 (fr) * | 2004-02-17 | 2006-06-09 | Fed Mogul Operations France Sa | Procede de fabrication de pieces mecaniques frittees |
US7237730B2 (en) * | 2005-03-17 | 2007-07-03 | Pratt & Whitney Canada Corp. | Modular fuel nozzle and method of making |
JP5421115B2 (ja) * | 2006-12-12 | 2014-02-19 | ジーケーエヌ シンター メタルズ、エル・エル・シー | 粉末金属鍛造品とその製造方法及び該粉末金属鍛造品成形用金型セット |
JP5922861B2 (ja) * | 2007-02-12 | 2016-05-24 | ジーケーエヌ シンター メタルズ、エル・エル・シー | 金属粉末鍛造物を製造する方法及びその方法によって製造された金属粉末鍛造物 |
CN101678516A (zh) * | 2007-04-04 | 2010-03-24 | Gkn烧结金属有限公司 | 粉末金属锻件以及制造的方法和设备 |
US8316541B2 (en) * | 2007-06-29 | 2012-11-27 | Pratt & Whitney Canada Corp. | Combustor heat shield with integrated louver and method of manufacturing the same |
AT507738B1 (de) * | 2008-12-16 | 2011-03-15 | Miba Sinter Austria Gmbh | Verfahren zur hinterlegung der innenverzahnung einer pulvermetallurgisch hergestellten schiebemuffe für ein schaltgetriebe |
AT509456B1 (de) * | 2010-08-31 | 2011-09-15 | Miba Sinter Austria Gmbh | Gesintertes zahnrad |
US9249836B2 (en) | 2013-08-15 | 2016-02-02 | Means Industries, Inc. | Coupling assembly having reduced undesirable noise and contact stress caused by a transition between operating modes of the assembly |
DE102014110903A1 (de) * | 2014-07-31 | 2016-02-04 | Hoerbiger Antriebstechnik Holding Gmbh | Verfahren zur Herstellung eines Schiebemuffenrings |
JP6751251B2 (ja) * | 2015-10-15 | 2020-09-02 | セイコーエプソン株式会社 | 三次元造形物の製造方法及び三次元造形物の製造装置 |
CN209524062U (zh) * | 2019-01-29 | 2019-10-22 | 浙江春风动力股份有限公司 | 一种花键齿、齿轮接合机构及变速箱 |
US20220152701A1 (en) * | 2019-04-24 | 2022-05-19 | Sumitomo Electric Industries, Ltd. | Method of making sintered body, and powder compact |
CN114789250B (zh) * | 2022-04-07 | 2024-04-09 | 中国航发北京航空材料研究院 | 一种粉末高温合金圆柱直齿轮构件的制备方法 |
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US2540457A (en) * | 1945-12-05 | 1951-02-06 | Isthmian Metals Inc | Method of making metal articles and products |
US2542912A (en) * | 1945-12-08 | 1951-02-20 | Ford Motor Co | Process and apparatus for coining sintered articles |
US3665585A (en) * | 1970-12-04 | 1972-05-30 | Federal Mogul Corp | Composite heavy-duty mechanism element and method of making the same |
CA1165514A (en) * | 1979-07-09 | 1984-04-17 | William J. Chmura | Thread forming of sintered porous metal shapes |
JPS5893801A (ja) * | 1981-11-30 | 1983-06-03 | Asahi Denka Kogyo Kk | 粉末焼結物品の製造方法 |
JPS58181805A (ja) * | 1982-04-15 | 1983-10-24 | Micro Filter Kk | 高緻密シ−ムレスパイプの製造方法 |
DE3325037C1 (de) * | 1983-07-11 | 1984-07-12 | Sintermetallwerk Krebsöge GmbH, 5608 Radevormwald | Mit wenigstens einer Verzahnung versehener Sintermetallkoerper |
JPS60141805A (ja) * | 1983-12-28 | 1985-07-26 | Fujitsu Ltd | 焼結丸軸の製造方法 |
JPS6439304A (en) * | 1987-08-05 | 1989-02-09 | Fujitsu Ltd | Production of iron-cobalt sintered alloy |
DE3839800A1 (de) * | 1988-11-25 | 1990-05-31 | Sinterstahl Gmbh | Verfahren und vorrichtung zur umformung von zahnflanken pulvermetallurgisch hergestellter kupplungskoerper |
US5009842A (en) * | 1990-06-08 | 1991-04-23 | Board Of Control Of Michigan Technological University | Method of making high strength articles from forged powder steel alloys |
GB2250227B (en) * | 1990-10-08 | 1994-06-08 | Formflo Ltd | Gear wheels rolled from powder metal blanks |
US5711187A (en) * | 1990-10-08 | 1998-01-27 | Formflo Ltd. | Gear wheels rolled from powder metal blanks and method of manufacture |
US5215946A (en) * | 1991-08-05 | 1993-06-01 | Allied-Signal, Inc. | Preparation of powder articles having improved green strength |
US5903815A (en) * | 1992-02-12 | 1999-05-11 | Icm/Krebsoge | Composite powdered metal component |
DE4211319C2 (de) * | 1992-04-04 | 1995-06-08 | Plansee Metallwerk | Verfahren zur Herstellung von Sintereisen-Formteilen mit porenfreier Zone |
US5390414A (en) * | 1993-04-06 | 1995-02-21 | Eaton Corporation | Gear making process |
JP3709200B2 (ja) * | 1993-04-30 | 2005-10-19 | ザ・ダウ・ケミカル・カンパニー | 高密度化した微粒子の耐火性金属または固溶体(混合金属)炭化物セラミック |
US5659955A (en) * | 1994-01-21 | 1997-08-26 | Plamper; Gerhard | Method of making powder metal helical gears |
US5762843A (en) * | 1994-12-23 | 1998-06-09 | Kennametal Inc. | Method of making composite cermet articles |
JP3499370B2 (ja) * | 1996-04-22 | 2004-02-23 | 株式会社日立ユニシアオートモティブ | 焼結冷間鍛造方法 |
JP3511553B2 (ja) * | 1996-08-02 | 2004-03-29 | 日立粉末冶金株式会社 | 焼結含油軸受の製造方法 |
US6110419A (en) * | 1997-12-02 | 2000-08-29 | Stackpole Limited | Point contact densification |
US6044555A (en) * | 1998-05-04 | 2000-04-04 | Keystone Powered Metal Company | Method for producing fully dense powdered metal helical gear |
-
1998
- 1998-11-02 DE DE19850326A patent/DE19850326A1/de not_active Ceased
-
1999
- 1999-10-28 AU AU12668/00A patent/AU1266800A/en not_active Abandoned
- 1999-10-28 DE DE59909201T patent/DE59909201D1/de not_active Expired - Fee Related
- 1999-10-28 WO PCT/EP1999/008189 patent/WO2000025960A1/de active IP Right Grant
- 1999-10-28 CA CA002348429A patent/CA2348429C/en not_active Expired - Fee Related
- 1999-10-28 JP JP2000579386A patent/JP2002528644A/ja active Pending
- 1999-10-28 ES ES99955898T patent/ES2221459T3/es not_active Expired - Lifetime
- 1999-10-28 EP EP99955898A patent/EP1133374B1/de not_active Expired - Lifetime
- 1999-10-28 AT AT99955898T patent/ATE264153T1/de not_active IP Right Cessation
-
2001
- 2001-05-02 US US09/847,116 patent/US6730263B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0025960A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2348429A1 (en) | 2000-05-11 |
CA2348429C (en) | 2009-07-28 |
ATE264153T1 (de) | 2004-04-15 |
DE19850326A1 (de) | 2000-05-04 |
JP2002528644A (ja) | 2002-09-03 |
US20020090314A1 (en) | 2002-07-11 |
AU1266800A (en) | 2000-05-22 |
US6730263B2 (en) | 2004-05-04 |
DE59909201D1 (de) | 2004-05-19 |
WO2000025960A1 (de) | 2000-05-11 |
ES2221459T3 (es) | 2004-12-16 |
EP1133374B1 (de) | 2004-04-14 |
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