EP2723516A1 - Forging method for producing a piston or piston shaft - Google Patents
Forging method for producing a piston or piston shaftInfo
- Publication number
- EP2723516A1 EP2723516A1 EP12730876.5A EP12730876A EP2723516A1 EP 2723516 A1 EP2723516 A1 EP 2723516A1 EP 12730876 A EP12730876 A EP 12730876A EP 2723516 A1 EP2723516 A1 EP 2723516A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- forging
- piston
- walls
- shaft
- forged
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/18—Making machine elements pistons or plungers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
- F02F2200/04—Forging of engine parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49249—Piston making
Definitions
- the present invention relates to a forging process for producing a piston or a piston stem.
- the invention also relates to a piston stem produced by this method and to a forging apparatus for carrying out the method.
- Known pistons are usually made cylindrical in a region of the piston crown in order to be able to close the space for the combustion taking place in an internal combustion engine.
- the pin bosses for receiving a piston pin with respect.
- the diameter of the piston skirt are set back inwards. Due to this circumstance, material can be saved in the outer regions and thus a weight reduction can be achieved.
- Shaft wall sections prevent in particular unwanted tilting about the pin axis in the top and bottom dead center.
- the two shank wall sections or the two shank walls are connected via box walls, which contain the piston pin bosses.
- From EP 0 838 587 B2 is a piston with shaft walls and this
- the form engraving in this case has an outer mold ring, a lower mandrel, through which a lower ejector is actuated and an upper mandrel, through which an upper ejector is actuated, wherein in the engraving of the upper mandrel a negative extension cone is provided.
- the mold is closed and the preform is formed by pressing the mandrels to each other, wherein by a combined actuation of the ejector and simultaneous opening of the mold, an ejection of the finished forged piston can take place.
- the present invention is concerned with the problem of providing an improved method for forging a piston skirt, with which, in particular, a weight-reduced piston with inclined box walls can be manufactured comparatively easily and thus economically.
- the present invention is based on the general idea
- Forging method for producing a piston skirt form two stages, being forged in a first stage with a first forging punch and in a subsequent second stage with a second forging punch.
- the piston skirt has, in a known manner, two skirt walls and two box walls connecting these skirt walls.
- the shaft walls can bend or widen conically outwards. A small expansion is required for better molding.
- the box walls are deformed such that their hub outer side substantially parallel to the piston axis or slightly open to the outside and the hub inner side to the free end out to the outside.
- the shank walls are simultaneously drawn into a position which is preferably parallel to the piston axis.
- Hub outside runs according to the Schmiedschrägen downwardly inside obliquely shaped, while the hub inner side approximately parallel to
- Piston axis that is in the present case substantially perpendicular.
- shank area ie the shank walls
- the increasing diameter does not refer to the wall thickness, but to the conical orientation of the
- the piston inner mold is at least in one
- inventive method comparatively simple and thus can be produced economically.
- the piston skirt is forged from an aluminum alloy and then annealed and / or tempered, in particular subjected to a T7 heat treatment.
- targeted heat treatments such as the Tempering or solution annealing can additionally increase the mechanical properties, in particular of aluminum materials.
- the principle of heat treatment is that by a
- the solution annealing is carried out for conventional piston alloys at temperatures between 480 ° and 550 ° C, wherein this temperature is chosen so that a sufficient amount of alloying elements is dissolved in the solid solution, so that the hardening effect after quenching and outsourcing actually occurs.
- the determining parameters here are in particular the solution annealing temperature, the preheating time, the temperature of the coolant, the temperature of the piston shaft at the moment of quenching and the aging temperature and duration.
- the piston or the piston shaft is forged from an iron alloy and then suitably cooled or heat treated to achieve the required strength and the desired residual stress state.
- the subsequent processing can be made from the forged a complete, one-piece piston or a piston base, which results in combination with a piston upper part by joining (eg by welding, gluing, soldering, etc.) or screw a piston.
- Fig. 1 shows an inventive two-stage forging process for
- Fig. 2 is an illustration of the two-stage according to the invention
- 3 is a view as in Fig. 1, but with a divisible
- Fig. 4 is a representation as in Fig. 2, but with spread two-piece second forging punch during the second forging stage.
- FIGS. 3 and 4 each show a complete sectional view parallel to the pin axis 4.
- FIGS. 1 and 3 a first forging stage of the overall two-stage forging method according to the invention is shown, whereas in FIGS. 2 and 4, the respectively associated second forging stage is shown.
- the skirt walls 2 are at least slightly conical outward and the box walls 3 have a hub inner side 7 approximately parallel to the piston axis 6 and one for the free End, that is in the present case down and inward pointing
- the shaft walls 2 are in the
- FIGS. 3 and 4 Sectional views according to FIGS. 3 and 4 not visible, since they are above or below the image plane.
- the box walls 3 are now formed with a second forging punch 9 in such a way that whose hub outer sides 8 are directed substantially parallel to the piston axis 6 or slightly outwards (cf., broken line in FIG. 2) and their inner sides 7 towards the free end, that is to say in the present case, downward.
- the shank walls 2 are simultaneously pulled into a position approximately parallel to the piston axis 6 and thereby define the outside diameter of the piston shank 1.
- Piston lower part are forged with the forging method according to the invention or even a complete piston.
- the skirt walls 2 are drawn inwards by the widening of the box walls 3 until they rest against an outer circumferential surface 10 of the second forging die 9 that is parallel to the piston axis 6.
- this outer lateral surface 10 does not run conically, but in the sectional view according to FIG. 2 approximately parallel to the piston axis 6.
- the first and second forging dies 5, 9 are pressed at the respective forging stage against a die 1 1, wherein the located between the forging punch 5.9 and the die 1 1 piston shaft 1 either during the entire forging process in the die 1 1, that is remains in a die housing the forging apparatus 12 or between forging with the first forging punch 5 and the
- the piston skirt 1 can be made of, for example, an aluminum alloy, a magnesium alloy, a ceramic or an iron-based material
- the second forging punch 9 is designed as a split forging punch.
- the first forging stage is performed in accordance with FIG. 3 analogously to the first forging stage of FIG. 1, wherein the hub inner sides 7 are formed parallel to the piston axis 6 and the hub outer sides 8 obliquely downwards and inwards.
- the hub inner sides 7 are formed parallel to the piston axis 6 and the hub outer sides 8 obliquely downwards and inwards.
- the adjoining second forging becomes the first
- the forging device 12 can be produced comparatively easily and economically, in particular pistons or piston shanks 1 with oblique box walls 3, with the oblique box walls 3 a
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011078145A DE102011078145A1 (en) | 2011-06-27 | 2011-06-27 | Forging method for producing a piston or piston skirt |
PCT/EP2012/061827 WO2013000789A1 (en) | 2011-06-27 | 2012-06-20 | Forging method for producing a piston or piston shaft |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2723516A1 true EP2723516A1 (en) | 2014-04-30 |
EP2723516B1 EP2723516B1 (en) | 2016-07-20 |
Family
ID=46420119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12730876.5A Not-in-force EP2723516B1 (en) | 2011-06-27 | 2012-06-20 | Forging method for producing a piston or piston shaft |
Country Status (8)
Country | Link |
---|---|
US (1) | US8904634B2 (en) |
EP (1) | EP2723516B1 (en) |
JP (1) | JP5982477B2 (en) |
KR (1) | KR20140048152A (en) |
CN (1) | CN103596711B (en) |
BR (1) | BR112013032612A2 (en) |
DE (1) | DE102011078145A1 (en) |
WO (1) | WO2013000789A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104959500A (en) * | 2015-06-23 | 2015-10-07 | 柳州科尔特锻造机械有限公司 | Piston rod forging production method |
EP3406367A1 (en) * | 2017-05-24 | 2018-11-28 | ThyssenKrupp Metalúrgica Campo Limpo Ltda. | Method and apparatus for producing a piston top with a cooling chamber |
CN110508733B (en) * | 2019-03-15 | 2021-02-12 | 内蒙古北方重工业集团有限公司 | Method for manufacturing high-strength extrusion shaft |
JP7393236B2 (en) | 2020-02-07 | 2023-12-06 | 株式会社神戸製鋼所 | Forging equipment and vehicle knuckles |
CN116174638B (en) * | 2022-12-06 | 2023-09-22 | 江苏珀然股份有限公司 | Wheel forges mould cleaning device |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1835863A (en) * | 1928-08-06 | 1931-12-08 | Champion Machine & Forging Com | Method of forming pistons |
US2539903A (en) * | 1946-12-05 | 1951-01-30 | Smith Corp A O | Piston fabrication |
DE1210302B (en) * | 1959-12-02 | 1966-02-03 | Karl Schmidt Ges Mit Beschraen | Method of manufacturing pistons with a coolant space in the piston crown |
JPS63119944A (en) * | 1986-11-10 | 1988-05-24 | Honda Motor Co Ltd | Forging method for piston |
DE3811200A1 (en) * | 1988-04-01 | 1989-10-19 | Berchem & Schaberg Gmbh | PISTON BLANK FOR A FORGED PISTON |
DE69724035T2 (en) * | 1996-05-20 | 2004-02-19 | Yamaha Hatsudoki K.K., Iwata | Method of manufacturing a piston for an internal combustion engine |
DE19643778C2 (en) * | 1996-10-23 | 2000-04-13 | Alcan Gmbh | Lightweight pistons |
US6032570A (en) * | 1998-04-10 | 2000-03-07 | Yamaha Hatsudoki Kabushiki Kaisha | Composite piston for machine |
JP2000005840A (en) * | 1998-06-24 | 2000-01-11 | Yamaha Motor Co Ltd | Forging piston and its manufacture |
JP3942129B2 (en) * | 1998-07-09 | 2007-07-11 | ヤマハ発動機株式会社 | Manufacturing method of forged piston and forging die |
JP4155423B2 (en) * | 1998-07-23 | 2008-09-24 | ヤマハ発動機株式会社 | Manufacturing method of forged piston and forged molding material |
DE10113629A1 (en) * | 2001-03-21 | 2002-10-02 | Thyssen Krupp Automotive Ag | Production of pistons or piston components such as piston heads for internal combustion engines comprises pre-forging a base body in a specified axial direction and forging the pre-formed piston body in one further axial direction |
US6862977B2 (en) * | 2002-03-25 | 2005-03-08 | Erp-Rotax Gmbh & Co. Kg | Piston |
US7104183B2 (en) * | 2004-07-07 | 2006-09-12 | Karl Schmidt Unisia, Inc. | One-piece steel piston |
DE102005041000B4 (en) * | 2005-08-29 | 2012-07-05 | Thyssenkrupp Automotive Ag | Method, production line and piston blank for producing a one-piece piston for internal combustion engines, and pistons for internal combustion engines |
DE102005061354A1 (en) * | 2005-12-21 | 2007-06-28 | Continental Teves Ag & Co. Ohg | Piston for a hydraulic brake and method of manufacture |
DE102006020861B4 (en) | 2006-05-04 | 2010-08-26 | Gesenkschmiede Schneider Gmbh | Single-stage forging process and device for the production of bush-type forgings |
ES2357618T3 (en) * | 2006-09-26 | 2011-04-28 | ThyssenKrupp Metalúrgica Campo Limpo Ltda. | PROCEDURE FOR THE MANUFACTURE OF A PISTON FOR INTERNAL COMBUSTION ENGINES AND PISTON FOR AN INTERNAL COMBUSTION ENGINE. |
JP5300118B2 (en) * | 2007-07-06 | 2013-09-25 | 日産自動車株式会社 | Aluminum alloy casting manufacturing method |
FR2934607B1 (en) * | 2008-07-30 | 2011-04-29 | Alcan Int Ltd | ALUMINUM ALLOY MOLDED PART WITH HIGH FATIGUE AND HOT FLUID RESISTANCE |
EP2453034A4 (en) * | 2009-07-03 | 2017-08-23 | Showa Denko K.K. | Process for production of roughly shaped material for engine piston |
DE102009056917B4 (en) * | 2009-12-03 | 2018-12-20 | Mahle International Gmbh | Method for producing a piston for an internal combustion engine |
CN103025902A (en) * | 2010-06-16 | 2013-04-03 | 诺尔斯海德公司 | Castable heat resistant aluminium alloy |
-
2011
- 2011-06-27 DE DE102011078145A patent/DE102011078145A1/en not_active Withdrawn
-
2012
- 2012-06-20 JP JP2014517600A patent/JP5982477B2/en active Active
- 2012-06-20 KR KR1020137034471A patent/KR20140048152A/en not_active Application Discontinuation
- 2012-06-20 BR BR112013032612A patent/BR112013032612A2/en active Search and Examination
- 2012-06-20 EP EP12730876.5A patent/EP2723516B1/en not_active Not-in-force
- 2012-06-20 WO PCT/EP2012/061827 patent/WO2013000789A1/en active Application Filing
- 2012-06-20 CN CN201280027439.2A patent/CN103596711B/en active Active
- 2012-06-26 US US13/533,604 patent/US8904634B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2013000789A1 * |
Also Published As
Publication number | Publication date |
---|---|
US8904634B2 (en) | 2014-12-09 |
KR20140048152A (en) | 2014-04-23 |
WO2013000789A1 (en) | 2013-01-03 |
CN103596711B (en) | 2016-08-31 |
CN103596711A (en) | 2014-02-19 |
BR112013032612A2 (en) | 2017-01-24 |
DE102011078145A8 (en) | 2013-03-07 |
EP2723516B1 (en) | 2016-07-20 |
DE102011078145A1 (en) | 2012-12-27 |
US20130036608A1 (en) | 2013-02-14 |
JP2014519987A (en) | 2014-08-21 |
JP5982477B2 (en) | 2016-08-31 |
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