EP1919643A1 - Procede, ligne de fabrication et ebauche de piston destines a la fabrication d'un piston monopiece destine a des moteurs a combustion interne et piston destine a des moteurs a combustion interne - Google Patents

Procede, ligne de fabrication et ebauche de piston destines a la fabrication d'un piston monopiece destine a des moteurs a combustion interne et piston destine a des moteurs a combustion interne

Info

Publication number
EP1919643A1
EP1919643A1 EP06777828A EP06777828A EP1919643A1 EP 1919643 A1 EP1919643 A1 EP 1919643A1 EP 06777828 A EP06777828 A EP 06777828A EP 06777828 A EP06777828 A EP 06777828A EP 1919643 A1 EP1919643 A1 EP 1919643A1
Authority
EP
European Patent Office
Prior art keywords
piston
forging
blank
groove
recess
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Withdrawn
Application number
EP06777828A
Other languages
German (de)
English (en)
Inventor
João Lester Garcia
Heraldo Carlos Furquim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Metalurgica Campo Limpo Ltda
Original Assignee
ThyssenKrupp Metalurgica Campo Limpo Ltda
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=36950594&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1919643(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ThyssenKrupp Metalurgica Campo Limpo Ltda filed Critical ThyssenKrupp Metalurgica Campo Limpo Ltda
Publication of EP1919643A1 publication Critical patent/EP1919643A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/10—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B21J13/025—Dies with parts moving along auxiliary lateral directions
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/001—One-piece pistons
    • 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 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons
    • 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
    • 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
    • Y10T29/49256—Piston making with assembly or composite article making
    • Y10T29/49261—Piston making with assembly or composite article making by composite casting or molding
    • 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
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/534—Multiple station assembly or disassembly apparatus

Definitions

  • PROCESS PROCESS, MANUFACTURING LINE AND PISTON ROLLING FOR
  • the invention relates to a method for producing a one-piece piston for internal combustion engines, having a piston skirt, a piston crown carried by the piston skirt and at least one laterally formed in a circumferential surface of the piston groove, by forging and final finishing.
  • the invention likewise relates to a production line for carrying out such a method, a piston blank produced in one piece by forging for the production of a piston for internal combustion engines and a correspondingly formed, finished piston.
  • Pistons for internal combustion engines are usually produced by means of casting or forging.
  • the casting production has the advantage that it allows the production of complex shaped pistons of low weight.
  • this requires a considerable manufacturing effort to be accepted. This is especially true when a steel material is to be used as a material to manufacture pistons that are suitable for particularly high loads.
  • Forged steel pistons may be formed integrally as well as two or more parts consist.
  • the individual parts are usually connected to one another in a force-locking and form-fitting manner by suitable joining methods in such a manner that they withstand the forces acting on them during practical use. Welding or conventional screwing of the individual parts of the piston are suitable for this purpose, for example.
  • a multi-part piston for an internal combustion engine is known from DE 102 44 513 A1.
  • This piston has on the one hand a forged steel piston upper part, in which a combustion bowl, an annular wall and a groove formed in the manner of a groove cooling channel are formed.
  • the piston has a piston lower part, which forms the piston upper part of the piston carrying the upper piston part and in which hub for receiving a piston connecting the piston with a connecting rod piston pin are formed.
  • the upper piston part and the lower piston part are preformed in separate operations by forging and then finished machined.
  • the finish machining of the upper piston part also includes the machining of the cooling channel delimiting wall sections, via which subsequently a material bond by welding or soldering connection to the piston lower part is produced.
  • a piston blank is first forged by forming in a bolt-like Schmiederohling, a so-called billet, starting from one end face of a recess whose outer wall forms the piston skirt of the piston blank. Subsequently, a recess is inserted into the piston skirt wall. For this purpose, a cutter or lathe tool from the outside is attached to the circumferential surface of the piston blank from the outside.
  • one-piece pistons produced in a known manner have the disadvantage that they are generally heavier than comparable pistons produced by casting.
  • the production engineering effort in the machining is high, since in the region of the formed on the peripheral edge of the piston crown top land and the piston skirt large amounts of material must be machined to produce the required finished shape. This high production cost leads to high production costs.
  • a recess is formed using the principle of the reverse flow extrusion in a forging blank starting from one end face whose formed by a flow of material against the direction of action of the punch outer wall forms the piston skirt.
  • a forge-depicting the forging tool acts on the provided with the groove peripheral surface of the forging blank.
  • the piston crown is formed by a crushing operation while maintaining the effect of the groove-forming forging tool.
  • a further forging device comprising a receptacle for the forging blank formed in the first forging device, a forging forming tool, an actuator for attaching the cullet forming forging tool to a peripheral surface of the forging blank held by the receptacle, and a plunger for forming the piston crown by upsetting the forging blank, starting from its end opposite the recess.
  • the inventive method and the inventively equipped production line allow the production of near-end close piston blanks, which in the course of final finishing only need to be machined to a small extent. This is achieved, on the one hand, by producing the piston skirt of the piston blank by means of backward extrusion. In this forming process, the material of the forging blank flows counter to the stroke direction of the forging punch used for forming in a suitably formed gap, so that a particularly great dimensional accuracy is achieved.
  • a fillet is already produced on the piston blank by a forming operation.
  • a special forging tool is provided, which acts after the generation of the piston skirt on the piston blank in such a way that forms at the latest during the subsequent forming of the piston crown, this groove.
  • the shaping of the fillet according to the invention which already takes place in the course of forging, enables a significant reduction in the weight of a piston produced according to the invention over conventionally produced forged pistons, since the forging blank present in each case need no longer comprise the volume present in the region of the fillet.
  • the cost of producing the groove is reduced to a minimum, since at most only minimal amounts of material must be removed in the course of cutting finishing in the region of the groove.
  • the forging tool can be used such that it forms the groove by active material displacement in the forging blank.
  • the relevant forging tool can Form the groove by a corresponding forming operation directly into the peripheral surface of the forging blank before the piston crown is generated.
  • the groove-forming tool then remains in its shaping position, so that the shape of the groove is maintained during the forming operation performed for the production of the piston crown.
  • a manufacturing technology particularly favorable embodiment of the method according to the invention which also allows to forge piston blanks whose dimensions deviate only minimally from the finished end shape of the piston to be produced, is characterized in that the forging blank after the generation of the piston skirt and before the action of the Hollow-forming forging tool in the region of the piston skirt has a larger diameter than in its hitherto undeformed section, so that the groove-forming forging tool can be placed in the region of the transition between the piston skirt and the previously undeformed portion of the forging blank, without larger To apply forming forces on the forging blank.
  • the compressed material of the forging blank fits against the forging tool held in its previously assumed position, so that a chamfer which corresponds to the dimensions of the tool in a particularly exact manner is imaged on the finished forged piston blank.
  • the recess can be preformed, for example, in a preliminary stage and then subsequently formed to form the piston skirt by application of the reverse flow extrusion. Accordingly, it may be expedient, in a production line according to the invention of the forging device for forming the recess in the forging blank, to precede a forging device for preforming the recess.
  • An inventively forged and integrally formed piston blank for the production of a piston for internal combustion engines which is provided with a piston skirt, a piston crown supported piston crown and at least one laterally formed in a circumferential surface of the piston blank groove, characterized in that the groove to a machining allowance of 4 mm from the corresponding finished dimension of the piston to be produced from the piston blank deviates.
  • the outlay for machining finishing is reduced to a minimum.
  • the final dimensional proximity of the piston blank produced according to the invention is preferably not limited to the region of the groove.
  • Pistons for internal combustion engines according to the invention which are produced from a piston blank produced in one piece by forging and have a piston skirt, a piston crown supported by the piston skirt and at least one groove formed laterally in a peripheral surface of the piston, are characterized in that the fiber shape of the structure on the surface of the Groove corresponds to the grain of the grain, the forging blank before finishing has at a distance of at most 3 mm from the surface of its groove. Due to the close proximity of the dimensions of a piston blank according to the invention designed and manufactured to the finished dimensions of the piston to be produced from it in the
  • the structure of the piston in this area has a fiber shape, in which at best the fibers lying next to the surface of the piston blank are cut or interrupted by the machining.
  • Figures Ia, Ib a forging device for preforming a forging blanket in two operating divisions;
  • Figures 2a-2d a forging device for molding the
  • Piston shaft in four operating positions
  • FIGS. 4a-4b show a forging device for shaping the groove and the piston crown
  • Figure 5 is a ready-forged piston blank.
  • the forging device Vl shown in FIGS. 1a, 1b for preforming a recess A in a cylindrical forging steel consisting of a forged steel S has a die 1 into which an upwardly open receptacle 2 for the forging blank S is formed.
  • the receptacle 2 In its lower region, the receptacle 2 has a portion 2 a, in which the diameter of the receptacle 2 corresponds to the diameter of the forging blank S.
  • a shell-shaped enlarged portion 2b connects to the portion 2a, so that the opening diameter of the receptacle 2 is larger than the diameter of the forging blank S.
  • the forging device Vl comprises a punch 3, which is moved in the direction of the die 1 for a forging stroke from a rest position arranged above the die 1.
  • the stamp 3 carries on its side facing the die 1 a convex bulging Embossing mandrel 4, which is arranged concentrically to the receptacle 2 of the die 1.
  • the head of a pusher In the bottom of the die 1 sits the head of a pusher, with which the forging blank S is ejected after preforming the recess A from the receptacle 2 of the die 1.
  • the forging temperature heated, obtained by dividing a rod material, not shown, cylindrical forging blank S in the receptacle 2 of the die 1 is set (Fig. Ia).
  • the punch 3 performs a forging stroke, in which the embossing mandrel 4 penetrates from its end face assigned to the punch 3 into the forging blank S.
  • the section of the forging blank S arranged in the upper widened section 2b of the die 2 is thereby widened such that its peripheral surface bears against the inner surface of the section 2b and a preform Av of the recess A is formed in the forging blank S by the embossing mandrel (FIG. ,
  • the forging device V2 shown in FIGS. 2a-2d for finish-forging the recess A likewise comprises a die 5 which has a receptacle 6a formed in a holder 6 for the forging blank S preformed in the device V1.
  • the height and the diameter of the receptacle 6a correspond to the height and the diameter of the undeformed portion of the forging blank S.
  • the forging device V2 is equipped with a punch 7, which on its side facing the die 5 concentric with the opening of the Receiving arranged 6a, convexly bulging at its top and otherwise cylindrical embossing mandrel 8 carries.
  • the outer shape of the tip of the embossing mandrel 8 corresponds to the inner shape of the recess A to be produced in the forging blank S.
  • the embossing mandrel 8 is surrounded by a likewise held in the punch 7, concentric with the embossing mandrel 8 aligned ring 9, whose opening diameter is greater than the outer diameter of the cylindrical portion of the embossing mandrel 8.
  • Opening diameter of the ring 9 and the outer diameter of the cylindrical portion of the embossing mandrel 8 greater than the diameter of the undeformed, seated in the receptacle 6a portion of the forging blank S is formed whose diameter is also greater than the diameter of the undeformed portion of the forging blank S.
  • a shoulder 11 is formed in the ring 9 so that the opening diameter of the ring 9 in this area is once again widened in relation to its opening diameter in the region of the annular gap 10.
  • the expanded in the region of paragraph 11 opening diameter of the ring 9 is adapted to the outer diameter of the cylindrically shaped holder 6, so that the ring 9 with its diameter-extended portion laterally includes the holder 6 when the punch 7 has reached the end position of the forging.
  • the height of the annular gap 10 is greater than the forging H, which performs the punch 7.
  • the Forging stroke and the position of the paragraph 11 of the ring 9 so dimensioned that when located in the end position of the forging punch 7 between the front side of the holder 6 opposite sales surface of the ring 9 is a distance.
  • the annular gap 10 and seated in the receptacle 6a of the holder 6 Schmiederohling S out open space 12 is formed.
  • the space 12 is used in the transformation of the forging blank S for receiving excess material that is present in the preformed area of the forging blank S, to ensure a secure filling of the annular gap 10, which, however, can not be absorbed by the volume of the annular gap 10.
  • the annular gap 10 is reliably filled with material during the forging of the forging blank S without the presence of excess material, the formation of the space 12 and accordingly the formation of the collar K on the forging blank S can be dispensed with.
  • the forged blank S preformed in the device V1 is placed with its undeformed part in the receptacle 6a of the holder 6, so that the section of the forging blank S expanded in preforming is freely above the holder 6 (FIG. 2a).
  • the punch 7 performs a forging stroke in which the tip of the embossing mandrel 8 moves into the preform Av of the recess A and initially displaces the material of the preformed section of the forging blank S until it meets the inner surface of the ring 9 (FIG ).
  • the material of the forging blank S can no longer escape laterally, it flows according to the principle of scrubnchens counter to the stroke direction X of the punch 7 in the annular gap 10 until it is completely filled. At the same time, the material of the forging blank S fills the space 12 (FIG. 2c). In this way, when the recess A is formed on the forging blank S, a cylindrical piston shank KS, which is formed by the material that has penetrated into the annular gap 10 and surrounds the recess A as an outer wall, is formed next to the recess A itself.
  • the forged blank S has, after the finished shaping of the recess A in the region of the transition from the piston shank KS to the hitherto undeformed part of the forging blank S, a circumferential collar K formed in the space 12, which protrudes laterally beyond the piston shank KS.
  • an ejector is again provided, the head of which is seated in the bottom of the receptacle 6a (FIG. 2d).
  • the forging devices Vl and V2 can together be part of a forging press not further illustrated here.
  • the collar K is separated from the forging blank S in a deburring device, not shown here.
  • the then obtained, freed from the collar K forging blanket S is shown in Fig. 3.
  • the device for separating the collar K from the forging blank S may be part of a second forging press, which additionally has a
  • the forging device V3 which is provided for the final forging of the piston blank R to be reshaped from the forging blank S.
  • the forging device V3 has a retaining pin 14 mounted on a base plate 13, the outer shape of which is adapted to the shape of the recess A formed in the forging blank S.
  • the height of the retaining pin 14 is greater than the height of the piston shaft KS.
  • the forging device V3 has two forging tools 15, 16 for forming a groove H on the piston blank R to be produced.
  • These forging tools 15,16 are each half-shell-shaped and movable by means of an actuator 17,18 from the lateral direction against the retaining mandrel 14 so that they enclose the scope of the retaining mandrel 14 in its working position and clamp the forging blank S on the retaining mandrel 14.
  • the forging tools 15,16 carry on their the inner mandrel 14 associated inner surface a horizontally oriented, over the entire width or the entire circumference of the respective inner surface radially extending projection 19.
  • the depth over which the projection 19 respectively opposite the inner surface of the forging tools 15th 16, corresponds to the depth of the throat Kue, which is formed in the preforming of the recess A in the region of the outside of the forging blank S at the transition from its undeformed portion to the deformed portion.
  • both the shape of the free end of the projection 19 and its height above the base plate 13 is dimensioned so that at the recess A on the retaining mandrel 14 attached Schmiederohling S and in-service position forging tools 15,16 whose projections 19 flush with the throat Kue abut.
  • the cross-sectional shape of the projection 19 corresponds to the cross-sectional shape of the in the piston blank R. To be formed by a fillet H.
  • the inner surfaces and the projections 19 of the forging tools 15,16 are held in the operating position at a distance from the retaining mandrel 14, the respective desired outer diameter the piston shaft KS and the piston crown B corresponds.
  • the height of the shoulder 20 above the base plate 13 is dimensioned such that the height existing between the shoulder 20 and the projection 19 corresponds to the desired height of the piston skirt KS.
  • the device V3 finally comprises a punch 22, which is supported by a yoke 23 and concentrically aligned with the holding mandrel 14.
  • the punch 22 On its end face assigned to the holding mandrel 14, the punch 22 carries elevations, by means of which the shape of the combustion bowls M to be shaped into the piston bottom B is determined.
  • the forging blank S is set at the holding mandrel 14 with its recess A positioned at rest from the holding mandrel 14 and the punch 22 at rest, so that the undeformed part of the forging blank S points freely in the direction of the punch 22 , Subsequently, the forging tools 15,16 are moved to their working position in which they are pressed against the located on the retaining mandrel 14 forging blank S, so that the finished shaped piston shaft KS is held in a defined position and the projections 19 flush in the throat Kue at the transition to the undeformed part of the forging blank S sit (Fig. 4a).
  • the yoke 23 with the punch 22 performs a forging stroke, through which the hitherto undeformed part of the forging blank S is compressed to form the piston head B of the piston blank R in the direction of the retaining mandrel 14.
  • the now compressed material of the hitherto undeformed part of the forging blank S abuts against the projections 19, so that in the region of the transition from the piston skirt KS to the piston head B, the fillet H is imaged accurately (FIG. 4b).
  • the punch 22 and the forging tools 15, 16 are moved back to their rest position, so that the finished forged piston blank R (FIG. 5) can be removed from the device V3.
  • the dimensions of the finished forged piston blank R deviate in the region of the bottom of the throat H by a machining allowance Zl of only 3 mm, in the region of the transition from the fillet H to the adjacent peripheral surfaces of the piston crown B and the piston shaft KS by a machining allowance Z2 of only 2 mm, in the region of the peripheral surfaces of the piston shaft KS by a machining allowance Z3 of likewise only 2 mm, in the region of the end face of the piston crown B by a machining allowance Z3 of likewise only 2 mm and in the region of the circumferential surface of the piston crown B by a machining allowance Z3 of turn only 3 mm from the final dimensions of the finished from the piston blank R to be produced, not shown here from.
  • the final machining finishing of the piston blank R is carried out in a conventional manner with conventional processing equipment.
  • the devices V1, V2 and V3 and the facilities required for the machining finishing are part of a further production line, not shown, in which from the forging blanks S finished machined piston are produced.
  • the production line in addition to the forging devices Vl, V2 and V3 presented here and the aforementioned devices for machining finishing, if necessary, comprise devices for heat treatment and cleaning, if necessary.
  • the forging blank S is forged during the formation of the recess A in the forging device Vl in such a way that the throat Kue in the region of the transition between the area undeformed until the end of the processing in the device Vl and the piston shaft KS of the forging blank S Throat Kue is formed, then simultaneously with the forming of the piston crown B, the groove H can be formed.
  • the invention thus enables increased productivity by shortening the cycle times with lower temperature losses of the forgings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forging (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

L'invention concerne un procédé et une ligne de fabrication destinés à la fabrication d'ébauches de piston (R) dont les dimensions sont proches des dimensions finales et ne nécessitant qu'un travail minime d'enlèvement de copeaux pour la finition. Selon l'invention, la tige de piston (KS) de l'ébauche (R) est fabriquée par extrusion en arrière et l'ébauche (R) comporte une cannelure (H) produite par formage. A cet effet, on fait intervenir un outil de forgeage particulier agissant sur l'ébauche (R) après création de la tige de piston (KS) de telle manière que la cannelure (H) est formée au plus tard lors du formage de la base de piston. Ainsi, le poids d'un piston fabriqué selon l'invention est considérablement réduit par rapport aux pistons forgés habituels.
EP06777828A 2005-08-29 2006-07-18 Procede, ligne de fabrication et ebauche de piston destines a la fabrication d'un piston monopiece destine a des moteurs a combustion interne et piston destine a des moteurs a combustion interne Withdrawn EP1919643A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005041000A DE102005041000B4 (de) 2005-08-29 2005-08-29 Verfahren, Fertigungslinie und Kolbenrohling zum Herstellen eines einteilig ausgebildeten Kolbens für Verbrennungsmotoren, sowie Kolben für Verbrennungsmotoren
PCT/EP2006/064368 WO2007025799A1 (fr) 2005-08-29 2006-07-18 Procede, ligne de fabrication et ebauche de piston destines a la fabrication d'un piston monopiece destine a des moteurs a combustion interne et piston destine a des moteurs a combustion interne

Publications (1)

Publication Number Publication Date
EP1919643A1 true EP1919643A1 (fr) 2008-05-14

Family

ID=36950594

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06777828A Withdrawn EP1919643A1 (fr) 2005-08-29 2006-07-18 Procede, ligne de fabrication et ebauche de piston destines a la fabrication d'un piston monopiece destine a des moteurs a combustion interne et piston destine a des moteurs a combustion interne

Country Status (5)

Country Link
US (1) US8572843B2 (fr)
EP (1) EP1919643A1 (fr)
BR (1) BRPI0615600A2 (fr)
DE (1) DE102005041000B4 (fr)
WO (1) WO2007025799A1 (fr)

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CN107443019A (zh) * 2017-08-14 2017-12-08 上海汽车变速器有限公司 深孔输入轴的温冷复合锻造成形方法

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DE102009040084A1 (de) 2009-09-04 2011-03-10 Mahle International Gmbh Verfahren zur Herstellung eines Kolbens für einen Verbrennungsmotor
DE102009040120A1 (de) 2009-09-04 2011-03-10 Mahle International Gmbh Verfahren zur Herstellung eines Aluminiumkolbens für einen Verbrennungsmotor
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US20090013531A1 (en) 2009-01-15
US8572843B2 (en) 2013-11-05
BRPI0615600A2 (pt) 2011-05-24
DE102005041000B4 (de) 2012-07-05

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