EP2790850B1 - Verfahren zur herstellung eines achsschenkels - Google Patents

Verfahren zur herstellung eines achsschenkels Download PDF

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Publication number
EP2790850B1
EP2790850B1 EP12812572.1A EP12812572A EP2790850B1 EP 2790850 B1 EP2790850 B1 EP 2790850B1 EP 12812572 A EP12812572 A EP 12812572A EP 2790850 B1 EP2790850 B1 EP 2790850B1
Authority
EP
European Patent Office
Prior art keywords
steering knuckle
die
forging
finished
contour
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.)
Active
Application number
EP12812572.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2790850A1 (de
Inventor
Markus Bachmann
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.)
CDP Bharat Forge GmbH
Original Assignee
CDP Bharat Forge GmbH
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Filing date
Publication date
Application filed by CDP Bharat Forge GmbH filed Critical CDP Bharat Forge GmbH
Publication of EP2790850A1 publication Critical patent/EP2790850A1/de
Application granted granted Critical
Publication of EP2790850B1 publication Critical patent/EP2790850B1/de
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/008—Incremental forging
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B21J5/025—Closed die forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/027—Special design or construction with punches 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
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/12—Making machine elements axles or shafts of specially-shaped cross-section

Definitions

  • the present invention relates to a method for producing a steering knuckle of commercial vehicles.
  • the final contour is to be understood as meaning the shape of the surface of the finished forging (before a possible mechanical fine machining such as trimming or hot-straightening), ie it also includes indentations, indentations, undercuts and the like.
  • Under outer contour is the part of the surface of the forging to see, which is generally directed away from the forging to the outside, and thus, for example, no undercuts, indentations or the like.
  • the outer contour is determined by the shape of the inner surfaces of the forging die.
  • a semi-finished or almost finished forged part with a smaller outer contour than the final contour is preferably obtained during the pre-forging.
  • the pre-forging can consist of one, but also of two or more forging steps, by means of which the forging of the final contour is approximated.
  • the die is filled in an optimal way "from the inside", resulting in much lower Committee by incomplete Gesenk spallung.
  • the provision of the extra step of forming, compared to the prior art, has advantages both in terms of economy and process stability.
  • Another advantage is that is displaced by the forming and in particular the insertion of the / the tool material and thus the fiber flow of the material is held parallel to the surfaces (the final contour).
  • the finished forged part is given increased strength, in particular at edges and bends as well as other more complicated geometric features of the surface of the forged part, such as, for example, bearing receptacles.
  • the tool which is introduced during forming in the forging, a mandrel or hollow mandrel.
  • a mandrel or hollow mandrel high forming forces can be applied, which lead to an efficient material displacement during forming and a complete filling of the die.
  • a hollow mandrel also allows a particularly precise shaping of the forged part at the insertion point and can thus be used particularly effectively for determining the final contour.
  • secondary molding elements of the finished forging are formed by the tool (s).
  • Belleformemia in the sense of the present application are forming features of the forged part surface, which forging technology is difficult or impossible to produce by dies (against each other moving die halves), for example, the shots for bearings on truck steering knuckles.
  • the formation of secondary features required in the prior art material-removing machining operations which not only increased the use of materials but also extended the process times.
  • the forming is carried out substantially at the temperature of the previous step of pre-forging.
  • the advantage here is that due to the still high temperatures from the forging process, a much less power-consuming forming is possible and at the same time no additional energy for heating the forging for the transformation is needed.
  • the forming / shaping directions determined by the tool / s substantially perpendicular to the closing direction of the die is / are.
  • the material forced towards the sides of the tool can thus almost completely fill the mold cavity defined by the die.
  • This mold cavity preferably defines the outer contour of the predetermined final contour, in other words the die determines the position of the substantially outwardly directed surfaces of the finished forging, while depressions, indentations or similar ancillary features can be defined by the tools (eg hollow mandrels).
  • FIG. 1 schematically shows the sequence of a manufacturing process of a truck steering knuckle according to the prior art.
  • a blank 10 made of steel is first compressed, pre-pressed and subjected to a first pre-forging step ( FIGS. 1a to c ), wherein the essential outer geometry of the finished component is generated.
  • Figure 1d the subsequent second pre-forging step ( Figure 1d ) are produced by the die, the detailed outer contours of this intermediate product 10 '(but not greater than the predetermined final contour).
  • FIG. 2 is for comparison with the conventional method of FIG. 1 the sequence of an exemplary method for the production of forgings shown according to the invention, again using the example of the truck steering knuckle.
  • a blank 20 is first compressed, pre-pressed and forged in two steps ( FIGS. 2a to d ) to substantially approximate the outer contour of the finished forging.
  • the pre-forging ie in the present case after the second pre-forging step
  • the blank 20 ' is still substantially at forging temperature
  • a deformation of the forging in a die is performed, the mold cavity of which the outer contour of the predetermined Final contour of the component defined.
  • each a hollow mandrel of the front and rear stub axle side in the semi-finished forging 20 'introduced and thereby the inwardly recessed bearing receivers 21 a and 21 b formed ( FIG. 2e and 3b ).
  • the hollow mandrels have exactly the shape and dimensions of the trainees bearing to be formed. Only then is removed by burring / hot straightening located in the forge blacksmithing excess, but the burring or hot straightening is no longer necessary to produce the complete final contour and thus takes much less time than the burring or hot straightening in due to the substantially lower material removal State of the art (cf.
  • FIG. 3 is shown in perspective and in sectional view, a comparison between the finished forged and deburred components.
  • the finished forged blank 10 'produced by the conventional method does not yet include recesses for the Bearing support, the corresponding side sections 11a and 11b are solid. Accordingly, the weight of the conventionally manufactured stub axle is 32kg.
  • the truck steering knuckle according to the invention already has the recesses for the bearing shells, so they no longer need to be made by machining under material rejects.
  • the weight of the finished forged blank, which is 29kg, is correspondingly lower. It can not only save about 10% of material but also significantly shorter process times can be achieved.
  • FIG. 4 is a perspective view of a die used in the method according to the invention shown, with the sake of clarity, only the lower die half 30 is shown. This is done in the second step of forging ( Figure 2d ) produced intermediate product 20 ', which is still substantially at the forging temperature, inserted into the die 30 and this closed by lowering the upper die half (not shown) (see arrow: "closing direction" in FIG. 4 ).
  • hollow dowels 31a and 31b are pressed from two directions (see arrows "forming direction") into the sides of the half-finished forging 20 'which form the bearing receptacles in the finished forged truck knuckle 20 "' Due to the still high temperatures from the previous forging process, due to the material displaced by the hollow mandrels 31a and 31b, the entire die shape, ie the predetermined final contour, is completely filled in. This is illustrated by the shaded contours of the forging 20 " , In other words, during the forming according to the invention, the material flows into the initially free mold spaces on the inner surfaces of the dies until the die mold has been filled.
  • slightly more material is preferably present in the die at the beginning of the forming, as is required in terms of volume for the final forging. During the subsequent displacement of the material due to the insertion of the tool / tools this flows into the burrs on the Die edges and thus always ensures a reliable, complete Gesenk hypollung.
  • the savings achieved by the inventive method of raw material is particularly good from the sectional drawing of FIG. 5 refer to.
  • the reference numeral 22 indicates that after the second pre-forging ( Figure 2d ) designated forged contour
  • reference numeral 23 denotes the final contour after the forming process according to the invention, that is, after the introduction of the hollow mandrels.
  • the predetermined by the die 30 outer end contour 23 is filled starting from the forged contour 22.
  • the volume fraction of the introduced hollow mandrel fills the die starting from the forged smaller forging contour 22 up to the predetermined final contour 23.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP12812572.1A 2011-12-16 2012-12-17 Verfahren zur herstellung eines achsschenkels Active EP2790850B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011088862A DE102011088862A1 (de) 2011-12-16 2011-12-16 Verfahren zum Umformen von Schmiedeteilen
PCT/EP2012/075757 WO2013087924A1 (de) 2011-12-16 2012-12-17 Verfahren zum umformen von schmiedeteilen

Publications (2)

Publication Number Publication Date
EP2790850A1 EP2790850A1 (de) 2014-10-22
EP2790850B1 true EP2790850B1 (de) 2016-06-01

Family

ID=47520923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12812572.1A Active EP2790850B1 (de) 2011-12-16 2012-12-17 Verfahren zur herstellung eines achsschenkels

Country Status (9)

Country Link
US (1) US9375778B2 (es)
EP (1) EP2790850B1 (es)
JP (1) JP6087372B2 (es)
KR (1) KR102031596B1 (es)
BR (1) BR112014014742B1 (es)
CA (1) CA2859332C (es)
DE (1) DE102011088862A1 (es)
MX (1) MX344480B (es)
WO (1) WO2013087924A1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107792173A (zh) * 2017-09-27 2018-03-13 湖北三环锻造有限公司 与拉杆臂一体化成形的汽车转向节

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104607544B (zh) * 2015-01-16 2016-06-22 芜湖三联锻造有限公司 一种长轴类转向节新型校正模具
CN108044019A (zh) * 2017-11-30 2018-05-18 枣庄远东实业开发总公司 一种基于空气锤预坯的汽车转向节立式锻造装置及工艺
CN109622845B (zh) * 2019-02-18 2021-07-13 湖北三环锻造有限公司 一种鼓式转向节预锻件闭式近净成形工艺及模具
CN112756530B (zh) * 2020-12-25 2022-07-22 章丘市普锐锻压有限公司 一种锻压工艺及锻压生产线

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
US4361360A (en) * 1979-03-05 1982-11-30 Siegfried Kuether Tube end forging process
US4321818A (en) * 1979-10-03 1982-03-30 Kawaski Yukon Kabushiki Kaisha Closed forging press
JPS605949Y2 (ja) * 1980-08-08 1985-02-25 トヨタ自動車株式会社 鍛造製品バリ取り仕上装置
JPS5853150Y2 (ja) * 1980-11-14 1983-12-03 トヨタ自動車株式会社 鍛造品のためのバリ取り用プレス型
JPS6277143A (ja) * 1985-09-30 1987-04-09 Nissan Motor Co Ltd 鍛造方法
JPH07100210B2 (ja) * 1986-10-03 1995-11-01 トピ−工業株式会社 履帯連結用リンクの製造方法
DE3701703A1 (de) * 1987-01-22 1988-08-18 Doege Eckart Verfahren und vorrichtung zur herstellung von kegelraedern
US4910990A (en) * 1987-06-18 1990-03-27 Delio Ralph D Apparatus for making substantially forged articles such as tank tread connectors
JP3239345B2 (ja) * 1993-03-25 2001-12-17 東芝ホームテクノ株式会社 炊飯器
JPH07124680A (ja) * 1993-10-31 1995-05-16 Riken Tanzou Kk 鍛造部品及びその製造方法
US5544413A (en) * 1994-06-10 1996-08-13 Omni Forge, Inc. Method and apparatus for manfacturing a flashless metal connecting rod
US5516130A (en) * 1994-12-22 1996-05-14 Interstate Forging Industries Inc. Forged control arm
AR001266A1 (es) * 1995-03-21 1997-09-24 Eaton Corp Conjunto de rotula de dirección y freno para camiones de trafico pesado o mediano
US6427326B1 (en) * 1999-06-17 2002-08-06 Honda Giken Kogyo Kabushiki Kaisha Method of manufacturing connecting rod
JP3777942B2 (ja) * 2000-03-15 2006-05-24 株式会社豊田自動織機 圧縮機用中空ピストンの製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107792173A (zh) * 2017-09-27 2018-03-13 湖北三环锻造有限公司 与拉杆臂一体化成形的汽车转向节

Also Published As

Publication number Publication date
JP2015500744A (ja) 2015-01-08
DE102011088862A1 (de) 2013-06-20
MX344480B (es) 2016-12-16
KR102031596B1 (ko) 2019-11-08
BR112014014742B1 (pt) 2020-10-13
WO2013087924A1 (de) 2013-06-20
JP6087372B2 (ja) 2017-03-01
US20150013408A1 (en) 2015-01-15
CA2859332C (en) 2020-01-21
CA2859332A1 (en) 2013-06-20
MX2014007088A (es) 2014-08-01
EP2790850A1 (de) 2014-10-22
KR20140103154A (ko) 2014-08-25
US9375778B2 (en) 2016-06-28
BR112014014742A2 (pt) 2017-06-13

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