WO2001026840A1 - Element de forgeage a froid et son procede de fabrication - Google Patents

Element de forgeage a froid et son procede de fabrication Download PDF

Info

Publication number
WO2001026840A1
WO2001026840A1 PCT/JP2000/007119 JP0007119W WO0126840A1 WO 2001026840 A1 WO2001026840 A1 WO 2001026840A1 JP 0007119 W JP0007119 W JP 0007119W WO 0126840 A1 WO0126840 A1 WO 0126840A1
Authority
WO
WIPO (PCT)
Prior art keywords
upright wall
forged product
outward flange
cold forged
base material
Prior art date
Application number
PCT/JP2000/007119
Other languages
English (en)
Japanese (ja)
Other versions
WO2001026840A9 (fr
WO2001026840A8 (fr
Inventor
Naoki Yoshioka
Jirou Aizaki
Original Assignee
Araco Kabushiki Kaisha
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
Application filed by Araco Kabushiki Kaisha filed Critical Araco Kabushiki Kaisha
Priority to AU76858/00A priority Critical patent/AU7685800A/en
Publication of WO2001026840A1 publication Critical patent/WO2001026840A1/fr
Publication of WO2001026840A8 publication Critical patent/WO2001026840A8/fr
Publication of WO2001026840A9 publication Critical patent/WO2001026840A9/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/30—Making machine elements wheels; discs with gear-teeth
    • 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
    • B21K23/00—Making other articles
    • B21K23/04—Making other articles flanged articles

Definitions

  • the present invention relates to a plate-shaped cold forged product having a recess at the center and a method for producing the same.
  • BACKGROUND ART A cold forged product of this kind is disclosed in Japanese Patent Application Laid-Open No. H10-220239, which has a disk-shaped bottom and a radius from the outer peripheral edge of the upper surface of the bottom. It has a ring-shaped outward flange part with a predetermined thickness extending outward in the direction, and is manufactured by half-blanking forming a base material consisting of one flat plate in the cold forging process. .
  • the thickness of the connecting portion between the outer peripheral edge of the bottom and the inner peripheral edge of the outward flange is reduced due to the half blanking process in the cold forging process, and the strength is insufficient. Site.
  • ratchet teeth are formed on an inner periphery of an outward flange portion thereof. In this case, if the thickness of the connecting portion between the bottom of the cold forged product and the outward flange is reduced, the strength is insufficient and the load on the ratchet teeth cannot be withstood.
  • the necessary strength can be obtained by increasing the thickness of the connecting part.
  • the thickness of the part increases and the weight increases, and the molding pressure increases, so the molding equipment becomes large and the manufacturing equipment becomes expensive.
  • an object of the present invention is to form a plate-shaped cold forged product having a recess in the center into a structure different from the structure formed by the half blanking forming process, so that the outward forging of the cold forged product is performed.
  • An object of the present invention is to solve the problem of insufficient thickness at a connection portion with a bottom portion of a flange portion and a problem caused by this.
  • DISCLOSURE OF THE INVENTION In order to achieve the above object, the present invention relates to a plate-shaped cold forged product having a recess in the center, the plate-shaped bottom being formed from an outer peripheral edge of the bottom.
  • An object of the present invention is to provide a cold forged product comprising: an upright wall portion having a thickness larger than a thickness of a bottom portion; and an outward flange portion extending radially outward from an outer peripheral edge of a tip of the upright wall portion.
  • the wall thickness of the upright wall which is the connecting portion between the bottom and the outward flange, is desired regardless of the thickness of the bottom and the outward flange. It can be formed to a thickness, and can solve all the problems of the conventional cold forging described above.
  • a bottom portion and an outward flange portion of the cold forged product include a bottom portion corresponding to the bottom portion, an upright wall portion higher than the upright wall portion, and an outward flange portion corresponding to the outward flange portion.
  • a base material integrally formed in the same thickness in advance is vertically compressed and deformed between the bottom portion and the outward flange portion in a cold forging process to increase the wall thickness of the upright wall portion. It is desirable to be done.
  • the upright wall portion of the base material plastically flows due to vertical pressing, and is formed to a desired thickness set by a molding die.
  • the present invention provides a disk-shaped bottom portion, a cylindrical upright wall portion rising from an outer peripheral edge of the bottom portion, and an annular outward flange extending radially outward from a distal end outer peripheral edge of the upright wall portion.
  • a base material of the same thickness, in which a portion is integrally formed in advance, is prepared in advance, and the base material is vertically compressed and deformed between the bottom portion and the outward flange portion in a plurality of forging steps.
  • An object of the present invention is to provide a method for producing a disk-shaped cold forged product having a circular concave portion in the central portion in which a lateral pressure is applied to the portion to increase the thickness of the upright wall portion.
  • this manufacturing method when the internal teeth are formed on the inner peripheral surface of the upright wall portion of the above-described disc-shaped cold forged product, the strength of the internal teeth is ensured without causing dripping at the opening end of the outward flange portion. can do.
  • FIG. 1 is a perspective view of a ratchet plate which is an example of a cold forged product according to the present invention
  • FIG. 2 (a) is a partial longitudinal sectional view of the ratchet plate shown in FIG.
  • Fig. 2 (b) is a partial longitudinal sectional view of a conventional ratchet plate
  • Figure 3 (a) is a plan view of the base material of the ratchet plate shown in Figure 1;
  • Figure 3 (b) is a cross-sectional view of the base material shown in Figure 3 (a);
  • Figs. 4 (a) to 4 (d) are cross-sectional views showing the dies mounted on the press forming apparatus for the base material shown in Figs. 3 (a) and 3 (b) and their operation modes;
  • Fig. 5 shows the convex surface formed on the inner periphery of the die shown in Fig. 4 (a);
  • Fig. 6 (a) uses a mold that is substantially the same as the mold shown in Fig. 4 (a) Vertical sectional view showing the state in which the press forming apparatus at the top dead center is completed;
  • FIG. 6 (b) is a longitudinal sectional view showing a state where the press forming apparatus shown in FIG. 6 (a) is at the bottom dead center;
  • Fig. 7 (a) is a cross-sectional view of the base material compression-molded by the press-forming device shown in Fig. 6 (a);
  • FIG. 7 (b) to 7 (f) are cross-sectional views showing the compression molding process of the base material shown in FIG. 7 (a);
  • Fig. 8 (a) is a cross-sectional view of another base material that is compression-formed by the press-forming apparatus shown in Fig. 6 (a);
  • FIG. 1 shows a ratchet plate 10 which is an example of a cold forged product according to the present invention.
  • the ratchet plate 10 is a disk-shaped cold forged product having a circular recess in the center, and as shown in FIG. 1 and FIG. A bottom 11, a cylindrical upright wall 12 rising from the outer periphery of the bottom 11, and an annular outward flange 13 extending radially outward from the outer periphery of the tip of the upright wall 12.
  • Upright wall portion 1 2 forms a connecting portion of the bottom portion 1 1 and the outward flange portion 1 3, in c above Rachietsu preparative plate 1 0 its inner to circumference Rachietsu preparative teeth 1 4 is formed in an arc shape, a bottom portion 1 1 and the outward flange 13 are formed to have the same thickness, whereas the upright wall 12 has the bottom 11 and the outward flange.
  • FIG. 2 (b) is a partial cross-sectional view of the conventional ratchet plate 1 corresponding to FIG. 2 (a).
  • the conventional ratchet plate 1 has a disc-shaped bottom la and a bottom. It is formed by an annular outward flange portion 1b extending radially outward from the outer peripheral edge of the upper surface of the portion 1a.
  • the outward flange portion lb is directly connected to the outer peripheral edge of the bottom portion 1a, and ratchet teeth 1c are formed on the inner periphery of the outward flange portion 1b.
  • the ratchet sheet 1 is manufactured by half-blow molding a base material made of a single flat plate in the cold forging step, a connection portion between the bottom 1 a and the outward flange 1 b is formed.
  • the thickness of 1 d is inevitably reduced, and the strength of the ratchet teeth 1 c is reduced.
  • dripping occurs at the open end of the outward flange 1 b.
  • the wall thickness of the upright wall portion 12 which is a connecting portion between the bottom portion 11 and the outward flange portion 13 is increased.
  • sufficient strength can be ensured in the upright wall portion 12, and even if the bottom portion 11 and the outward flange portion 13 are made thinner to reduce the weight, drooping occurs at the opening end of the outward flange portion 13.
  • the required strength of the ratchet teeth 14 can be ensured without causing them.
  • FIGS. 3 and 4 (a) to 4 (d) show an example of a cold forging process of the ratchet plate 10.
  • the base material 30 shown in FIG. 3 includes a bottom 31 corresponding to the bottom 11 of the ratchet plate 10 as a finished product, and an upright wall 1 2 of the ratchet plate 10.
  • the higher standing wall portion 32 and the outward flange portion 33 corresponding to the outward flange portion 13 of the ratchet plate 10 are integrally formed in advance in a pressing process (not shown) to have the same thickness. It is.
  • the press forming apparatus for the base material 30 is equipped with a die composed of a die 40, an ejector 41, a gear punch 42 and a guide plate 43. Be activated. In this die, the inner peripheral surface of the die 40 has, as shown in FIG.
  • a convex surface 40a is formed in a portion corresponding to.
  • the gear punch 42 is lowered while the base material 30 is positioned on the upper surface of the ejector 41. Clamp the material 30.
  • the gear punch 42 is further lowered, and the base material 30 is pushed into the die 40.
  • the upright wall portion 32 of the base material 30 is wrung out by the inner peripheral convex surface 40a of the die 4 ⁇ , and a lateral pressure is applied radially inward on the outer peripheral surface thereof.
  • the upright wall portion 32 of the base material 30 is inserted into the die 40. Subsequently, as shown in FIG. 4 (c), the guide plate 43 is lowered and the outward flange portion 33 of the base material 30 is clamped on the upper surface of the die 40. Further, the guide plate 43 is lowered as shown in FIG. 4 (d), and the guide plate 43 and the ejector 41 are used to stand between the bottom 31 of the base material 30 and the outward flange 33.
  • the material of the base material 30 is radially inward around the upright wall 32.
  • a tooth profile corresponding to the shape of the gear punch 42 is formed on the inner peripheral surface of the upright wall 32.
  • the gear punch 4 2 is formed on the peripheral surface of the upright wall portion 32 of the base material 30.
  • the present invention can be applied to a case where a spline, a serration, a screw, or the like is formed instead of the tooth profile.
  • the flow of the material of the base material 30 in the upright wall portion 32 may be outward in the radial direction as long as the material flows in the circumferential direction of the upright wall portion 32.
  • the inner peripheral convex surface 40a of the die 40 is not necessarily provided.
  • a base material 10 previously press-formed into a cross-sectional shape as shown in FIG. 7 (a) or FIG. 8 (a) using a press forming apparatus shown in FIG. 6 (a).
  • a or 10b can be pressure-formed in a plurality of forging steps to produce a cold forged product as shown in FIG.
  • the press forming apparatus shown in FIG. 6A includes a lower die 21 and an upper die 22.
  • the lower mold 21 comprises an annular mold part 21a and a cylindrical cushion part 21b fitted to the mold part 21a, and the mold part 21a is a lower mold holder 23a.
  • the cushion portion 21b is fixedly attached to the cushion base 23b.
  • a support pillar 24b is provided upright at the center of the lower base plate 24a, and a lower holder 23a is received by a gas damper 25a fitted to the outside of the sabotbiller 24b. Gas damper 2 that is received and fits inside the support pillar 2 4 b
  • the cushion base 23b is received at 5b.
  • the upper mold 22 includes an annular mold portion 2 2a and a cylindrical pad portion 2 2b fitted to the mold portion 2 2a.
  • the mold portion 2 2a is connected via a spacer 26a.
  • the pad part 22 b is fixed to the pad base 26 c and assembled.
  • the upper die holder 26 b receives the upper die base plate 27 a and the pad base 2
  • a gas damper 27b provided at the center of the upper base plate 27a is connected to 6c.
  • the pad base 26 c is directly fixed to the upper base plate 27 a.
  • the press forming apparatus 20 is operated by hydraulic drive means (not shown).
  • the upper mold base plate 27a, spacer 26a, and mold part 22a of the upper mold 22 are moved from the top dead center shown in FIG. 6 (a) to the bottom dead center shown in FIG. 6 (b) by the pressure.
  • the base material 10a or 10b positioned between the lower mold 21 and the upper mold 22 is moved down to Fig. 4 (a) to 4
  • a compression forging process is performed in substantially the same state as the forging step in the press forming apparatus shown in (d) to produce a cold forged product 10 shown in FIG.
  • the base material 10a shown in Fig. 7 (a) has the disk-shaped bottom portion 11a rising from the outer peripheral edge of the bottom portion 11a.
  • the rising wall portion 12a expands outward toward the outward flange portion 13a.
  • the vertical wall is compressed and deformed in the vertical direction to increase the wall thickness of the standing wall 12a, and the inner wall of the standing wall 12a is formed in the final pressing process.
  • Ratchet teeth 14 are formed.
  • the base material 10 b shown in FIG. 8 (a) has an upright wall portion 1 2 b rising from the outer peripheral edge of the disk-shaped bottom portion 11 b toward the outward flange portion 13 b. It is formed in a tapered shape that spreads out in FIG. 6 (a), and is positioned in the upper surface of the lower die 21 of the press forming apparatus shown in FIG. b)-As shown in Fig.
  • Ratchet teeth 14 are formed on the inner peripheral surface.
  • the base material 10a (or 10b) is compressed vertically between its bottom 11a (or lib) and the outward flange 13a (or 13b).
  • an inward side pressure is applied in the radial direction around the upright wall portion 12a (or 12b), and the wall thickness of the upright wall portion increases.
  • the wall thickness of the upright wall 12 which is the connecting portion between the bottom 11 and the outward flange 13 is thick, and the strength of the upright wall 12 is required. The strength is secured.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

L'invention concerne un élément de forgeage à froid dont le procédé de fabrication permet de supprimer le problème rencontré lorsqu'un élément de forgeage à froid comportant une partie inférieure discoïde et une partie rebord annulaire faisant face à l'extérieur possédant une épaisseur spécifique, s'étendant dans le sens radial, vers l'extérieur, depuis la surface supérieure du bord périphérique extérieur de la surface supérieure de la partie inférieure, est formé par semi-étirage, et que l'épaisseur de paroi de la partie reliant la partie marginale périphérique extérieure de la partie inférieure et la partie périphérique intérieure de la partie rebord faisant face à l'extérieur, est amincie et que sa résistance est insuffisante. Ledit élément de forgeage à froid est un élément discoïde doté d'un évidement circulaire en son centre, qui se caractérise en qu'il comprend une partie inférieure discoïde (11), une partie de paroi verticale cylindrique (12) plus épaisse que la plaque de la partie inférieure, et une partie rebord annulaire faisant face à l'extérieur (13), s'étendant radialement vers l'extérieur depuis le bord périphérique extérieur d'extrémité de la partie paroi verticale.
PCT/JP2000/007119 1999-10-15 2000-10-13 Element de forgeage a froid et son procede de fabrication WO2001026840A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76858/00A AU7685800A (en) 1999-10-15 2000-10-13 Cold forging and method of manufacturing the cold forging

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP11/294154 1999-10-15
JP29415499 1999-10-15

Publications (3)

Publication Number Publication Date
WO2001026840A1 true WO2001026840A1 (fr) 2001-04-19
WO2001026840A8 WO2001026840A8 (fr) 2001-09-27
WO2001026840A9 WO2001026840A9 (fr) 2003-09-04

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Application Number Title Priority Date Filing Date
PCT/JP2000/007119 WO2001026840A1 (fr) 1999-10-15 2000-10-13 Element de forgeage a froid et son procede de fabrication

Country Status (2)

Country Link
AU (1) AU7685800A (fr)
WO (1) WO2001026840A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011025277A (ja) * 2009-07-24 2011-02-10 Canon Inc 金属部材の製造方法
CN109500230A (zh) * 2018-11-30 2019-03-22 四川航天长征装备制造有限公司 一种筒件成形及其法兰边校形方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60227943A (ja) * 1984-04-26 1985-11-13 Kanemitsu Doukou Yousetsushiyo:Goushi ねじ部を有する板金製品の製造方法
JPH049243A (ja) * 1990-04-27 1992-01-14 Kubota Tekkosho:Kk 回転体の製造方法
JPH04258337A (ja) * 1991-02-12 1992-09-14 Aida Eng Ltd カップ状部材の塑性加工方法
JPH07124657A (ja) * 1993-11-09 1995-05-16 Yutaka Giken Co Ltd ボス部の増肉成形方法及び成形装置
JPH07144245A (ja) * 1993-11-25 1995-06-06 Kubota Tekkosho:Kk 回転体ボス部の成形方法
JPH0839185A (ja) * 1994-07-27 1996-02-13 Fuji Kiko Co Ltd エンボス歯車及びその製造方法
JPH1054415A (ja) * 1996-08-09 1998-02-24 Kaneko Kinkoushiyo:Kk Ｔナット及びその製造方法
JPH11320021A (ja) * 1998-05-19 1999-11-24 Topre Corp 板金の厚肉化プレス工法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60227943A (ja) * 1984-04-26 1985-11-13 Kanemitsu Doukou Yousetsushiyo:Goushi ねじ部を有する板金製品の製造方法
JPH049243A (ja) * 1990-04-27 1992-01-14 Kubota Tekkosho:Kk 回転体の製造方法
JPH04258337A (ja) * 1991-02-12 1992-09-14 Aida Eng Ltd カップ状部材の塑性加工方法
JPH07124657A (ja) * 1993-11-09 1995-05-16 Yutaka Giken Co Ltd ボス部の増肉成形方法及び成形装置
JPH07144245A (ja) * 1993-11-25 1995-06-06 Kubota Tekkosho:Kk 回転体ボス部の成形方法
JPH0839185A (ja) * 1994-07-27 1996-02-13 Fuji Kiko Co Ltd エンボス歯車及びその製造方法
JPH1054415A (ja) * 1996-08-09 1998-02-24 Kaneko Kinkoushiyo:Kk Ｔナット及びその製造方法
JPH11320021A (ja) * 1998-05-19 1999-11-24 Topre Corp 板金の厚肉化プレス工法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011025277A (ja) * 2009-07-24 2011-02-10 Canon Inc 金属部材の製造方法
CN109500230A (zh) * 2018-11-30 2019-03-22 四川航天长征装备制造有限公司 一种筒件成形及其法兰边校形方法

Also Published As

Publication number Publication date
WO2001026840A9 (fr) 2003-09-04
AU7685800A (en) 2001-04-23
WO2001026840A8 (fr) 2001-09-27

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