EP1839772A1 - Verfahren und Vorrichtung für die plastische Verarbeitung einer hohlen Zahnstange und hohle Zahnstange - Google Patents

Verfahren und Vorrichtung für die plastische Verarbeitung einer hohlen Zahnstange und hohle Zahnstange Download PDF

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Publication number
EP1839772A1
EP1839772A1 EP07005750A EP07005750A EP1839772A1 EP 1839772 A1 EP1839772 A1 EP 1839772A1 EP 07005750 A EP07005750 A EP 07005750A EP 07005750 A EP07005750 A EP 07005750A EP 1839772 A1 EP1839772 A1 EP 1839772A1
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EP
European Patent Office
Prior art keywords
wall thickness
work piece
rack bar
blank
mandrel
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Withdrawn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
EP07005750A
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English (en)
French (fr)
Inventor
Seiji Shiokawa
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.)
Shiokawa Hirohisa
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Shiokawa Hirohisa
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
Priority claimed from JP2006093190A external-priority patent/JP2007275896A/ja
Application filed by Shiokawa Hirohisa filed Critical Shiokawa Hirohisa
Publication of EP1839772A1 publication Critical patent/EP1839772A1/de
Withdrawn legal-status Critical Current

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    • 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
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/767—Toothed racks
    • 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
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/767—Toothed racks
    • B21K1/768—Toothed racks hollow

Definitions

  • the present invention relates to a production of rack bar in a steering mechanism of a vehicle from a pipe shaped blank by plastic working, and, more particularly, to its improvement, by which an increased reduction in the weight of the product is obtained in comparison with the prior art.
  • a rack bar is a main part of a steering system of a vehicle and has conventionally been produced by machining from a solid bar of a rounded cross-sectional shape by using originally a hobbing machine and recently a broaching machine.
  • a machining from a solid bar of rounded cross-sectional shape makes the product to be heavy. Therefore, a solution has been proposed, wherein the machined product is subjected to a subsequent boring by using a gun drill to obtain a hollow structure, thereby reducing the weight.
  • this solution makes the production cost to be increased on one hand and, on the other hand, makes the resource consumption efficiency to be reduced.
  • the present invention aims to overcome the above difficulties in the prior art and, in particular, to provide a technology, by which an effective use of the material along the entire length of the blank is realized, a desired performance as a rack bar is obtained and increased degrees of a weight reduction, a cost performance, a resource saving and a vehicle performance is realized.
  • a method for forging a of a rack bar of radially outwardly copied type wherein a pipe shaped work piece is held by a die set, the material of the work piece is plastically flown to the die set located diametrically outward from the work piece in a manner that a toothed shape of the die set is copied to the work piece.
  • the present invention features that an adjustment of the cross sectional area of the work piece is preliminary done by a local increase or decrease of wall thickness of the work piece prior to the execution of the rack forging process of radial expanded copied type.
  • An adjustment of the cross-sectional area according to the present invention is carried out by an apparatus, which is constructed by a combined die set having an elongated mandrel and a plurality of dies and a vertical or horizontal hydraulic cylinder mechanism, which is cooperated with the die set in a manner that a desired local increase or decrease of the wall thickness of the blank pipe is obtained at respective positions of the blank pipe along its length.
  • any suitable reciprocating mechanism such as a ball screw type, where a rotating movement is converted to a linear movement, may be employed.
  • a rack bar of VGR (variable gear ratio) type is usually used.
  • VGR variable gear ratio
  • the electric operated type requires an increased bending strength of toothed portion, i.e., an increased size of tooth part as well as an increased thickness.
  • the present invention can achieve this goal, while obtaining the maximum reduction of the weight of a rack bar.
  • a forging of toothed portions is done by a radially outwardly directed plastic flow of metal of a pipe shaped blank while preventing fibrous metals from being broken.
  • an adjustment of the cross sectional area of the blank pipe is essential and has been done by a grinding.
  • a plastic working is done for obtaining a desired increase or decrease in the wall thickness at locations along the length of the work piece, so as to obtain desired values of cross-sectional area, corresponding to the desired functions required at the respective locations.
  • a wall thickness corresponding to the wall thickness of the blank pipe is basically maintained, so that a desired toothed shape is obtained under the plastic flow, although a wall thickness increase by a diameter reduction can be taken when it is necessary.
  • a wall thickness reduction is done so long as a desired strength within a permissible range is obtained.
  • a wall thickness reduction may be done by ironing, which causes the work piece to be axially elongated. Namely, in the present invention, the length of the product must be decided while an axial elongation as generated by the reduction of the wall thickness of the blank pipe is taken into the consideration.
  • a blank pipe of a reduced axial length for a value corresponding the axial elongation can be used, resulting in a corresponding reduction of the weight of product.
  • the weight of a product is almost equal to that of the blank pipe and is about 1,236kg when the blank of wall thickness of 4mm and of a diameter of 25mm has a length of 615mm.
  • the value of wall thickness at toothed portions is maintained to that of the blank pipe, i.e., 4mm and the wall thickness of the portion other than the toothed portion is reduced to 2mm by an ironing process, while keeping the desired strength of the product.
  • a weight reduction of the present invention is 25.6% over the prior art as in '378, '204, '205 or '703 patent and is, even, better than 60% over the prior art where a solid blank rather than the pipe shaped blank is used. Irrespective of such an additional process like a swaging or ironing for obtaining a cross sectional area control, a substantial reduction of the cost is obtained.
  • the redemption cost of the die set would be, at the most, 10yen per one product. It will thus be understood that a material cost reduction of about 48yen per one product is possible.
  • a resultant reduction in the weight of a vehicle is obtained, which assists in an improvement of a drive ability of the vehicle, on one hand, and, on the other hand, in a reduction in a fuel consumption efficiency.
  • the reduction in the fuel consumption efficiency per one car would be minimal but is significant in view of a huge automobile market, which might be amount to 70,000,000 cars in worldwide.
  • Figs. 1a to 1e illustrates a series of steps or stages for forming a rack bar according to the present invention.
  • a reference numeral 10 denotes a blank pipe (intermediate part) or a work piece supplied from a maker after subjected to a phosphate coating process.
  • the wall thickness of a blank is designated by to and its length by L 0 , respectively.
  • the wall thickness to has a value of 4mm, the material at a portion (tooth profile forming portion) of the blank pipe of this value of wall thickness is subjected to radially outwardly directed plastic flow, resulting in a formation of toothed portions of desired values of height and strength.
  • a first stage diameter reduction is done only at the tooth profile forming portion. Namely, at the location 10' of the blank pipe of a predetermined length from its left-hand end is subjected to a diameter reduction, so that the wall thickness t 1 is obtained, which is equal to or slightly increased over the wall thickness to of the blank pipe. Such a diameter reduction is done by a swaging process as will be explained later.
  • the length of the reduced diameter part 10' corresponds to that of a toothed part 11 (Fig. 1e) of a rack bar.
  • the remaining portion, which was not subjected to the diameter reduction, is designated by 10".
  • a wall thickness reduction is done at a part of a rack bar, which becomes a connection part (axially extended part from the toothed part).
  • a wall thickness to of 4mm of a blank pipe is suitable for the toothed part to obtain desired values of tooth height and strength needed for a rack bar product after the completion of a forging process.
  • such a value of wall thickness of 4mm is excessive for the connection part in view of its designated function, since the connection part is less stressed when compared with the toothed part.
  • t 2 a wall thickness reduction
  • an ironing process may be employed, which accompanies with an elongation of the blank pipe from a length of L 0 to L 1 .
  • a wall thickness reduced portion 10-2 of a wall thickness of t 2 is formed as shown in Fig. 1c.
  • the length L 1 corresponds to a length of a rack bar as a final product.
  • a blank pipe of a length corresponding to that of a product is needed.
  • the length L 1 corresponding to that a product is obtained by a wall thickness reduction accompanied with the corresponding axial elongation.
  • an initial blank pipe of a reduced length can be employed for a value corresponding to an axial elongation as obtained during a wall thickness reduction process.
  • a blank pipe length can be reduced from a value of L 1 to a value of L 0 .
  • a relatively short length portion 10-3 is left, which has a value of thickness to corresponding to that of the initial blank pipe.
  • This value of wall thickness at the portion 10-3 is suitable for machining screw threads for an engagement with a part of a steering mechanism.
  • a process for a diameter reduction is done so that a desired reduced value of inner diameter is obtained, which is suitable for the machining.
  • the reduced diameter portion 10-1 is obtained by additionally reduce the diameter of the portion 10' obtained at the second step in Fig. 2b.
  • a flattening is done at a location of the blank pipe where toothed portions are to be formed.
  • the reduced diameter portion 10-1 of the blank is, at its upper surface 10-1A, flattened, resulting in a semi-circular cross-sectional shape of the blank at the portion 10-1.
  • a fifth step is shown in Fig. 1e, where a forging of toothed portions is done at the flattened portion 10-1A of the blank pipe.
  • the blank pipe is held by a die set and mandrels are inserted to the blank pipe alternately between left-handed and right-handed directions.
  • a rack bar forging is done in a manner that toothed portions on the die set are copied to the blank pipe, so that toothed portions 11 are formed as shown in Fig. 1e.
  • the rack bar fording may be done by a system as describe in any of '378, '204, '205 and '703 patents.
  • any of elongated type mandrel as in '378, '204 or '205 patent or a shuttle type mandrel as in '703 patent may be desirably used.
  • the latter shuttle type mandrel as shown in Fig. 2 is used.
  • Fig. 2 shows a combined type die set for a rack bar forging, which includes a bottom die 12 and a top die 14, between which the blank pipe 10 is held.
  • short sized mandrels (shuttles) 16a and 16b are arranged on the left-handed and the right-handed sides of the die set.
  • pusher rods 17a and 17b are respectively arranged in a manner that the pusher rods 17a and 17 engage, at respective ends, with recesses 15a and 15b at the ends of the shuttles 16a and 16b.
  • the reduced diameter portion 10-1 of the blank pipe is arranged between the upper and lower dies 12 and 14. Under a closed condition between the dies, the upper wall 10-1A of the reduced diameter portion 10-1 of the blank pipe is pressed by toothed portion 14A of the upper die 14 and is substantially flattened, thereby completing the flattening process as explained with reference to Fig. 1d and allowing the rack forging process to be instantly commenced.
  • a die set for practicing this step includes a die holder20, a die set constructed by a guide 22, a drawing die 23 and a squeezing die 24, which are, in series, inserted to the holder 20, and a mandrel 26 of a three stepped shape.
  • the mandrel 26 is connected to a hydraulic cylinder mechanism (not shown) .
  • the mandrel 26 is formed with a front portion 26-1 of reduced diameter and having a length corresponding to that of the toothed portion 11 (Fig. 1e) of a rack bar as a final product. Furthermore, the mandrel 26 is, at its rear end, formed with a rear portion 26-2 of an increased diameter.
  • a diameter reduction process as practiced by the device shown in Figs. 3a to 3c will be explained. Namely, at the first stage as shown in Fig. 3a, a blank pipe 10 after the completion of a phosphate coating process is mounted to the mandrel 8. As explained in Fig. 1a, the blank pipe 10 has a length of L 0 and a wall thickness of t 0 , which is uniform along the entire length.
  • the mandrel 26 is moved forward as shown by an arrow a in Fig. 3a, which causes the blank pipe 10 to be pushed as shown by arrows a' in Fig. 3b due to the fact that the diameter expanded portion 26-2 of the mandrel 26 contacts, at its end surface (shoulder), with the blank 10.
  • the blank 10 is, first, inserted into the die holder 20 and then into the guide 22 under a guide action of a tapered portion 22A at the inlet end of the guide 22.
  • the blank 10 is substantially not subjected to any plastic deformation, thereby keeping the outer diameter of the blank pipe to be unchanged. In other words, a small clearance exists between the inner diameter of the blank pipe 10 and the front portion 26-1 of the mandrel 26.
  • a further forward movement of the blank 10 causes the latter to be introduced into the drawing die 23 via its tapered inlet portion 23A, so that the blank 10 is subjected to a diameter reduction in a manner that a clearance with respect to the front portion 26-1 of the mandrel 26 is diminished.
  • a portion of the blank 10 thus subjected to diameter reduction is designated by a reference numeral 10' and a portion of the blank 10 of the original diameter not subjected to diameter reduction is designated by a reference numeral 10".
  • the reduced diameter portion 10' has a length, which corresponds to that of a toothed portion of a rack as the final product.
  • a worked blank intermediate product
  • the mandrel 26 is finally and additionally moved in the forward direction as shown in Fig. 3c, so that the reduced diameter portion 10' is, at its tip end, squeezed by a die 24 and the squeezed portion of the work piece is designated by a reference numeral 10"'.
  • a squeezed portion 10"' is not shown in the corresponding Fig. 1b, it is used for an engagement with a mandrel during a subsequent wall thickness reduction process and is cut and removed after the completion of the use.
  • FIGs. 4a to 4g illustrates the detail of a wall thickness reduction process and a diameter reduction process at the connecting portion of the rack bar as explained schematically in Fig. 1c.
  • a plastic working device for a wall thickness reduction is provided, which includes a long stroke hydraulic cylinder device (not shown), a mandrel 30 connected to the hydraulic cylinder device so that the mandrel 30 is axially reciprocated, a die 32 cooperating with the mandrel 30 for a diameter reduction, and a striker 34 for a diameter expansion at an axial end and which is shown in Fig. 4a at its position radially outwardly retracted as illustrated by arrows b' .
  • the mandrel 30 forms a stepped member constructed by an inlet or front part 30-1, an intermediate part 30-2 of an increased diameter connected to the part 30-1 and a rear part 30-3 of a reduced diameter to that of the inlet part 30-1 for a connection with a hydraulic mechanism (not shown).
  • the inlet part 30-1 and the increased diameter part 30-2 have values of length, which correspond, respectively, to those of a toothed part and a connection part (shaft) of a rack bar as a final product.
  • Fig. 4a illustrates a condition of the plastic working device, whereat a blank pipe 10 after subjected to the preliminary diameter reduction process by the device in Fig. 3 is held by the mandrel 30.
  • the mandrel 30 has an outer profile, which corresponds to an inner profile of the blank at an area from the portion 10' to 10".
  • the inlet part 30-1 of the mandrel 30 is, at its leading end, contacted with the squeezed part 10"' as obtained at the process as shown in Fig. 3c.
  • a hydraulic pressure is introduced into the hydraulic cylinder mechanism, causing its piston rod (not shown) to be extended, so that the mandrel 30 in connection with the piston is moved forwardly as shown by an arrow a .
  • the blank 10 Due to the fact that the leading end of the inlet part 30-1 of the mandrel is in contact with the squeezed part 10"' of the mandrel 10, the blank 10 is entrained by the movement of the mandrel 30 toward the die 32 as shown by the arrow a . As a result, the blank 10 is introduced into the die 32 from the squeezed part 10"' .
  • the portion 10' of the blank after the squeezed part 10"' in the direction of its movement as shown by the arrow a has a value of an outer diameter, which is slightly larger than that of the inner diameter of the die 32. However, the difference in these values substantially corresponds to a clearance of the portion 10' with respect to the inlet part 30-1.
  • the portion 10' is subjected to a slight diameter reduction and the work piece is not substantially subjected to any wall thickness reduction or is subjected only to a very slight wall thickness reduction. Namely, it is shown in Fig. 4b that no wall thickness change occurs in the portions 10"' and 10' even after the passage of the die 32.
  • portion 10" of values of the wall thickness and the outer diameter, which are substantially unchanged with respect to those of the initial blank pipe.
  • the portion 10" has a value of an outer diameter, which is properly larger than that of an inner diameter of the die 32 for a wall thickness of the work piece. The difference of these values is, for example, about one half of the wall thickness of the work piece. As a result, the portion 10" (Fig.
  • the striker 34 is, from the radially retracted position, moved radially inwardly as shown by arrows b toward a position, whereat the front end of the striker 34 is contacted with the connection part 30-3 of the mandrel.
  • Fig. 4d which part has a value of wall thickness nearly equal to that of an initial blank pipe and which is radially outwardly expanded with respect to the wall thickness reduced part 10-2.
  • the part 10-3 may be subjected to a diameter reduction process, so as to obtain an increased wall thickness, which is suitable for a subsequent tapping operation.
  • Fig. 4d a fully retracted position of the mandrel 30 is illustrated.
  • a device for diameter reduction which comprises a mandrel 36 and a die 37.
  • the mandrel 36 is formed with a front part 36-1 of reduced diameter, a taper part 36-2 and a base part 36-3, which is in connection with a hydraulic cylinder (not shown).
  • An introduction of a hydraulic pressure to the hydraulic cylinder causes the mandrel 36 to be moved forward, so that the work piece on the mandrel 36 is introduced into the die 37.
  • the portions 10"' and 10' of the work are subjected to a diameter reduction for a value corresponding to a difference between the inner diameter of die 37 and the outer diameter of the work.
  • Fig. 4f illustrates the most forwardly moved position of the mandrel 36 with respect to the die 37, whereat the shoulder portion 36-2 of the mandrel 36 is faced with the die at its inlet end.
  • the part 10' (Fig. 4e) of the work is, at its entire length, subjected to a diameter reduction while keeping the wall thickness being unchanged, thereby obtaining a reduced diameter portion 10-1 as shown in Fig. 4f having a tip end as illustrated by 10-1'. From this extreme position, the mandrel 36 is retracted in the rearward or reverse direction as shown by an arrow c in Fig. 4g.
  • the part 10-1 of a reduced diameter as also illustrated in Fig. 1c is thus obtained.
  • Figs. 5a to 5d illustrate a second embodiment of the present invention, wherein preliminary plastic working processes for obtaining a work piece, i.e., a diameter reduction at a location becoming a toothed part of a rack bar and a wall thickness reduction as a location becoming a connection part (shaft part) of the rack bar as illustrated in Figs. 1b and 1c, respectively are done under one shot principle from a blank pipe after subjected to the phosphate coating process followed only by a squeezing at its tip end.
  • a plastic working device is provided, which is constructed by a die set 38 and a mandrel 39.
  • the die set is constructed by an outer cylindrical body (die holder) 40 and an end-to-end connected structure of a series of members, which includes a first guide cylinder 42, a squeeze die 44, a second guide cylinder 46 and a diameter reduction die 48.
  • the outer cylindrical body 40 is, at its front end, formed with an inward projected portion 40-1, with which the diameter reducing die 48 located at the front end of the end-to-end connected combined die structure is engaged, while a retainer member 49 is screwed to the rear end of the outer cylindrical body 40 in manner that the member 49 is engaged with the first guide cylinder 42 located at the rear end of the end-to-end connected structure, so that the structure is fixed to the outer cylindrical body 40.
  • the first guide cylinder 42 has a front end 42A outwardly tapered for a smooth introduction of the blank by the mandrel 39, which is followed by a remained part of a uniformed inner diameter.
  • the squeeze die 44 is formed with an inner stepped part 44A, which is cooperated with the mandrel for obtaining a wall thickness reduction of blank.
  • the squeeze die 44 is connected, via the second guide cylinder 46 of an uniform inner diameter, to diameter reducing die 48, which has a tapered par 48A, which functions purely for diameter reduction of the tip end of the blank while keeping its wall thickness.
  • the combined die structure is cooperated with the mandrel 50 for carrying out the designated working.
  • the mandrel 39 is formed with a rear large diameter part 50, a middle diameter part 52 and a front small diameter part 52-2.
  • the mandrel 39 is connected with a hydraulic cylinder mechanism (not shown) for obtaining a reciprocated movement of the mandrel 39.
  • the middle diameter part 52 is formed with a tapered part 52-1, from which the small diameter part 52-2 is axially forwardly projected.
  • the plastic working device is further provided with a blank knockout pin 54 for removing a product after completion of the designated processes.
  • the work piece 10 is an original blank pipe supplied from a maker, to which a phosphate coating process has been completed.
  • the work piece has been subjected a squeezing process only at its leading end, while the remaining part is left at a straight shape with a uniform wall thickness.
  • the work piece (blank pipe) 10 is introduced into the plastic working device by means of the mandrel 39 moving in the left-handed direction as shown by an arrow a in Fig. 5a. Namely, the mandrel receives the work piece 10 without substantial clearance at the middle diameter part 52 and engages with the squeezed tip end 10a of the work piece at the front small diameter part 52-2.
  • the work piece 10 is entrained by the forward movement of the mandrel 39 as shown by the arrow a .
  • any substantial working is not obtained, i.e., the diameter as well as the wall thickness of the work piece are unchanged, until a condition is obtained, where the front end of the work piece 10 is made contact with the stepped part 44A of the squeezing die 44 as shown in Fig. 5a.
  • the portion 10"" of reduced diameter of the is made substantial contact with the front small diameter part 52-2 of the mandrel.
  • the value of wall thickness of the portion 10"" is slightly increased or substantially unchanged with respect to the value of wall thickness of the initial blank.
  • the portion 10""' of the blank which is located on the middle diameter part 52 of the mandrel and which is engaged with the squeezing die 44, is subjected to a wall thickness reduction.
  • the remaining portion 10-3 of the blank located rearward from the die 44 is not subjected to diameter reduction, i.e., the outer diameter is maintained.
  • this portion 10-3 of the unchanged outer diameter of the blank is pushed back on the middle diameter part 52 of the mandrel 39 in the rearward direction in accordance with the progress of the wall thickness reduction by the squeezing die 44.
  • a rearward push-back type wall thickness reduction is done.
  • 1c is created, which is constructed by a diameter reduced part 10-1 of a value of wall thickness unchanged with respect to that of the initial blank pipe (a part becoming a toothed part of a rack bar as a final product), a wall thickness reduced part 10-2 of a value of the thickness reduced, for example, to one half of that of the blank pipe (a part becoming a connection part of the rack bar as a final product) and an end part 10-3 having a cross sectional area allowing an additional tapping working (a part for forming a screw portion for connection with an adjacent part).
  • this second embodiment is advantageous in that a worked blank for forging a rack bar is obtained under one shot process from a straight blank pipe while preparatory works are eliminated except for a squeezing process at the tip end, resulting in a high efficiency of the process.
  • the hydraulic cylinder device for operating a mandrel is illustrated as horizontal type.
  • a hydraulic cylinder device of vertical type may also be used.
  • a mechanism such as an elongated ball screw operated by a servomotor of a variable velocity may also be used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP07005750A 2006-03-30 2007-03-21 Verfahren und Vorrichtung für die plastische Verarbeitung einer hohlen Zahnstange und hohle Zahnstange Withdrawn EP1839772A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006093190A JP2007275896A (ja) 2006-03-16 2006-03-30 中空ラックの塑性加工方法及び装置及び中空ラック

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EP1839772A1 true EP1839772A1 (de) 2007-10-03

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EP2929954A1 (de) * 2014-04-08 2015-10-14 U.S. Manufacturing Corporation Verfahren zur herstellung einer leichtgewichtigen achswelle mit variabler wand mit reibungsgeschweisstem flansch und achswelle
US9630451B2 (en) 2014-06-18 2017-04-25 American Axle & Manufacturing, Inc. Method of manufacturing hollow axle shaft for a vehicle
US9670951B2 (en) 2014-04-08 2017-06-06 A.A.M International S.A.R.L. Variable-wall light-weight axle shaft with an integral flange member and method for making the same
DE102021201652A1 (de) 2021-02-22 2022-08-25 Thyssenkrupp Ag Verfahren zur Herstellung einer Zahnstange für ein Lenkgetriebe eines Kraftfahrzeugs, Zahnstange für ein Lenkgetriebe eines Kraftfahrzeugs und Lenkgetriebe für ein Kraftfahrzeug

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JP6576058B2 (ja) * 2015-03-10 2019-09-18 日本製鉄株式会社 パイプの増肉成形方法
JP2016179475A (ja) * 2015-03-23 2016-10-13 高周波熱錬株式会社 ラックバー及びラックバーの製造方法
EP3371034B1 (de) 2015-11-04 2020-02-26 Neturen Co., Ltd. Verfahren zur herstellung von zahnstangen
DE102016212308B4 (de) 2016-07-06 2018-02-22 Thyssenkrupp Ag Verfahren zur Herstellung einer Zahnstange für ein Lenkgetriebe eines Kraftfahrzeugs, sowie Zahnstange
DE102016212303A1 (de) 2016-07-06 2018-01-11 Thyssenkrupp Ag Zahnstange und ein Verfahren zur Herstellung einer Zahnstange für ein Lenkgetriebe eines Kraftfahrzeugs
DE102016212304B4 (de) 2016-07-06 2018-02-22 Thyssenkrupp Ag Verfahren zur Herstellung einer Zahnstange für ein Lenkgetriebe eines Kraftfahrzeugs, sowie Zahnstange
DE102016212301A1 (de) * 2016-07-06 2018-01-11 Thyssenkrupp Ag Zahnstange und ein Verfahren zur Herstellung einer Zahnstange für ein Lenkgetriebe eines Kraftfahrzeugs
JP6840582B2 (ja) * 2017-03-16 2021-03-10 高周波熱錬株式会社 ラックバーの製造方法
JP7133304B2 (ja) * 2017-11-21 2022-09-08 高周波熱錬株式会社 中空ラックバーの製造方法及び製造装置
DE102020101851B4 (de) * 2020-01-27 2022-05-25 Benteler Automobiltechnik Gmbh Federbeingabel sowie Verfahren zur Herstellung einer Federbeingabel
CN116787085A (zh) * 2023-07-21 2023-09-22 东风襄阳旋压技术有限公司 一种半空心电机轴及其成型工艺与装置

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CN106660092B (zh) * 2014-04-08 2019-04-16 美国轮轴制造国际有限责任公司 形成具有摩擦焊接凸缘的可变壁轻型车轴的方法
US10543717B2 (en) 2014-04-08 2020-01-28 Aam International S.À R.L. Variable-wall light-weight axle shaft with an integral flange member and method for making the same
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