US20070006628A1 - Molding method by forging and molding method for case - Google Patents

Molding method by forging and molding method for case Download PDF

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Publication number
US20070006628A1
US20070006628A1 US10/542,686 US54268604A US2007006628A1 US 20070006628 A1 US20070006628 A1 US 20070006628A1 US 54268604 A US54268604 A US 54268604A US 2007006628 A1 US2007006628 A1 US 2007006628A1
Authority
US
United States
Prior art keywords
forming
case
boss
thickness
forging
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.)
Abandoned
Application number
US10/542,686
Other languages
English (en)
Inventor
Youichi Tabei
Takashi Araki
Shinji Kouno
Shoichi Yanaoka
Takashi Miura
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.)
NINOMIYA CO Ltd
Robert Bosch GmbH
Bosch Corp
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIURA, TAKASHI, YANAOKA, SHOICHI, ARAKI, TAKASHI, KOUNO, SHINJI, TABEI, YOUICHI
Assigned to BOSCH AUTOMOTIVE SYSTEMS CORPORATION, NINOMIYA CO., LTD. reassignment BOSCH AUTOMOTIVE SYSTEMS CORPORATION CORRECTED ASSIGNMENT DOCUMENT SUBMISSION TO CORRECT THE NAME OF THE ASSIGNEE PREVIOUSLY RECORDED AT REEL/FRAME 018230/0869 Assignors: MIURA, TAKASHI, YANAOKA, SHOICHI, ARAKI, TAKASHI, KOUNO, SHINJI, TABEI, YOUICHI
Publication of US20070006628A1 publication Critical patent/US20070006628A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/02—Producing blanks in the shape of discs or cups as semifinished articles for making hollow articles, e.g. to be deep-drawn or extruded
    • 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
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • 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
    • 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
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • 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
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group

Definitions

  • the present invention relates to a method of forming by forging and a case forming method.
  • cup-shaped cases with a boss provided on the inside are widely employed in various fields.
  • the case of the electromagnetically controlled valve of an injection apparatus used to supply fuel to the cylinders in an internal combustion engine is a cup-shaped member with an integrally formed inside boss for affixing the electromagnetic coil and the magnetic core.
  • Cup-shaped cases such as these having an inside boss are also usually formed by forging, for cost reasons, and in the intermediate product form require the formation of overlays on the plate core material.
  • Japanese Unexamined Patent Application publication No. 2000-94088 discloses a method of forming a cup with an inside boss in which the material is obtained by spheroidizing annealing a forged slab and subjecting the material to shot bonderizing treatment. Because the method includes the step of cutting round steel bar, it endeavors to reduce the cutting cost by using round bar having a relatively small diameter, and gives the material a thick configuration suitable for forming a cup having an internal boss by forging the cut sections of round bar. To eliminate such tasks, there is also known a method of forming a case having an internal boss by preparing and forging a flat steel slab.
  • An object of the invention is to provide a method of forming by forging and a case forming method capable of overcoming the aforesaid problems of the prior art.
  • An object of the invention is to provide a method of forming for manufacturing a high-quality case by blanking of sheet material.
  • Another object of the invention is to provide a case forming method capable of manufacturing high-quality cases at low cost.
  • a characterizing feature of the invention is that the method of forming by forging material comprises a first step of preparing sheet material, and a second step in which a thickness of a circumferential portion of the material is made thinner than a thickness of a center portion of the material.
  • the case forming method comprises a first step of preparing the sheet material, and a second step in which a thickness of a circumferential portion of the material is formed to be thinner than a thickness of a center portion of the material.
  • the method of forming a cup-shaped case having an internal boss comprises a step of preparing sheet material, a step of forming a circumferential portion of the material to be thinner than a thickness of a center portion of the material while simultaneously time stamping-forming the thicker center portion into a concave shape, and a step of using forward drawing to stamping-form the intermediate product formed by the above stamping-forming into a cup-shaped member having a bottom that is thicker than the peripheral wall.
  • FIG. 1 is a diagram for illustrating the process of forming a case with an internal boss in accordance with the invention.
  • FIG. 2 is a diagram for illustrating the process of forming a case with an internal boss in accordance with the invention.
  • FIG. 3 is a diagram for illustrating the process of forming a case with an internal boss in accordance with the invention.
  • FIG. 4 is a diagram for illustrating the process of forming a case with an internal boss in accordance with the invention.
  • FIG. 5 is a diagram for illustrating the process of forming a case with an internal boss in accordance with the invention.
  • FIG. 6 is a diagram illustrating the forming process when the first intermediate formed product shown in FIG. 2 is used to manufacture a gear.
  • FIG. 7 is a diagram illustrating the forming process when the first intermediate formed product shown in FIG. 2 is used to manufacture a gear.
  • FIG. 8 is a diagram illustrating the forming process when the first intermediate formed product shown in FIG. 2 is used to manufacture a gear.
  • FIG. 9 is a diagram illustrating the forming process when the first intermediate formed product shown in FIG. 2 is used to manufacture a pulley.
  • FIG. 10 is a diagram illustrating the forming process when the first intermediate formed product shown in FIG. 2 is used to manufacture a pulley.
  • FIG. 11 is a diagram illustrating the forming process when the first intermediate formed product shown in FIG. 2 is used to manufacture a pulley.
  • FIGS. 1 to 5 are process ironings for explaining an embodiment of method of the invention, applied to the manufacture of the case of an electromagnetically controlled valve of a fuel injection apparatus used to supply fuel to an internal combustion engine.
  • the sheet member shown in FIG. 1 is prepared as material 1 .
  • the material 1 can be obtained by, for example, by blanking and stamping low-carbon steel sheet.
  • material 1 is a disk-shaped member, but it does not have to be disk-shaped.
  • upsetting is used to reduce the thickness of the periphery compared to the thickness at the center portion while forming a concavity in the thick center portion, forming the first intermediate formed product 2 shaped as shown in FIG. 2 .
  • the intermediate formed product 2 shown in FIG. 2 has a circumferential thin annular portion 21 , a thick portion 22 on the inside of the thin annular portion 21 that is thicker than the thin annular portion 21 , and a concave portion 22 A on the center portion of the thick portion 22 .
  • the thick portion 22 is formed into at least the case bottom and internal boss, so it is thickened to allow for at least the amount of material for the internal boss formed integrally with the bottom.
  • the first intermediate formed product 2 it is preferable for the first intermediate formed product 2 to be annealed to prevent cracking occurring in the subsequent process steps.
  • the first intermediate formed product 2 is stamping-formed to form the thick portion 22 into a bottom 32 and the thin annular portion 21 into a peripheral wall 31 that extends integrally from the bottom 32 , thereby forming a second intermediate formed product 3 shaped as shown in FIG. 3 .
  • the second intermediate formed product 3 of FIG. 3 can readily be obtained by the drawing and ironing process.
  • drawing and ironing are used to slightly thicken the outer edge 31 A of the peripheral wall 31 , giving the wall 31 a skirt-like shape.
  • the thickness of the peripheral wall 31 is less than the thickness of the bottom 32 . If an external flange is not needed, it is not necessary to thicken the outer edge 31 A.
  • the case 5 having an internal boss shown in FIG. 5 .
  • the bottom 52 and peripheral wall 51 are approximately the same thickness and the internal boss 53 and external boss 54 on the bottom 52 are coaxial.
  • the internal boss 53 is provided in order to incorporate an electromagnetic solenoid, and the external boss 54 is provided to accommodate a bearing.
  • An external flange 51 A on the outside edge of the peripheral wall 51 extends integrally at a right-angle to the peripheral wall 51 .
  • the first intermediate formed product 2 shown in FIG. 2 is a general-purpose member.
  • the first intermediate formed product 2 can be used as an intermediate product in the manufacturing of, for example, sprockets, gears, pulleys, cams, links and fixing brackets.
  • the first intermediate formed product 2 is prepared and subjected to forward/backward drawing forging steps whereby the thick center portion of the first intermediate formed product 2 is formed into a boss 61 and the thin portion is formed into a thin annular portion 62 having a uniform thickness.
  • the boss 61 is cup-shaped, formed as a cylinder with a bottom.
  • the intermediate formed product in FIG. 6 is stamped to remove the bottom 61 A of the boss 61 , forming the cylindrical boss 63 shown in FIG. 7 .
  • the periphery of the thin annular portion 62 is trimmed and blanked, forming a plurality of teeth 62 A to thereby obtain a gear 6 having a boss 63 ( FIG. 8 ).
  • the steps of using the first intermediate formed product 2 of FIG. 2 to manufacture a pulley will now be described with reference to FIGS. 9 to 11 .
  • the first intermediate formed product 2 is prepared and stamped to increase the thickness of the peripheral edge of the thin portion, thereby forming the outer ring 71 shown in FIG. 9 .
  • the outer ring 71 After forming the outer ring 71 , forward/backward drawing forging steps are used whereby the thick center portion is formed into a boss 72 and a thin annular portion 73 having a uniform thickness is formed between the outer ring 71 and the boss 72 ( FIG. 10 ).
  • the boss 72 is cup-shaped, formed as a cylinder with a bottom, and the outer ring 71 is formed to have the required dimensions for outer ring 74 .
  • a pulley 7 is obtained comprising the boss 75 and the outer ring 74 integrated by the thin annular portion 73 of uniform thickness.
  • a groove may be formed on the outer ring 74 by machining or the like.
  • the method of forming by forging and a case forming method according to the invention is useful for the low-cost fabrication of parts such as sprockets, gears, pulleys, cams and fixing brackets, and for the low-cost, high-quality manufacture of cup-shaped cases with an internal boss.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Gears, Cams (AREA)
  • Pulleys (AREA)
US10/542,686 2004-04-16 2004-04-16 Molding method by forging and molding method for case Abandoned US20070006628A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2004/005443 WO2005099929A1 (ja) 2004-04-16 2004-04-16 鍛造による成形方法及びケースの成形方法

Publications (1)

Publication Number Publication Date
US20070006628A1 true US20070006628A1 (en) 2007-01-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/542,686 Abandoned US20070006628A1 (en) 2004-04-16 2004-04-16 Molding method by forging and molding method for case

Country Status (6)

Country Link
US (1) US20070006628A1 (de)
EP (1) EP1736255B1 (de)
JP (1) JPWO2005099929A1 (de)
CN (1) CN1784278A (de)
DE (1) DE602004030279D1 (de)
WO (1) WO2005099929A1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090282885A1 (en) * 2008-05-16 2009-11-19 Masakazu Ooka Method of forming spring washer blind-holes into a piston for an automobile transmission
US20110016944A1 (en) * 2009-07-24 2011-01-27 Canon Kabushiki Kaisha Method of producing metallic member
US20120299673A1 (en) * 2007-04-19 2012-11-29 Indimet Inc. Solenoid housing and method of providing a solenoid housing
US20140111295A1 (en) * 2011-04-07 2014-04-24 Indimet Inc. Solenoid housing and method of making the same
US20150020563A1 (en) * 2013-07-18 2015-01-22 GM Global Technology Operations LLC Method for the manufacture of motor vehicle body parts
US9079808B2 (en) 2010-10-06 2015-07-14 Nippon Kayaku Kabushiki Kaisha Gas generator, gas generator holder and method for manufacturing gas generator holder
WO2015147297A1 (ja) * 2014-03-28 2015-10-01 新日鐵住金株式会社 複数の増肉部分を有する板状成形体の製造方法及び複数の増肉部を有する板状成形体
US11148186B2 (en) * 2017-04-03 2021-10-19 Matec Co., Ltd. Method of manufacturing cup structure
US11192162B2 (en) * 2016-04-04 2021-12-07 Thyssenkrupp Steel Europe Ag Method and device for forming a semi-finished product

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100709458B1 (ko) * 2006-05-17 2007-04-18 주식회사 영진전기 휴대폰용 카메라모듈커버의 성형방법
US8261592B2 (en) * 2007-04-19 2012-09-11 Indimet Inc. Method of providing a solenoid housing
JP5609455B2 (ja) * 2010-09-10 2014-10-22 トヨタ自動車株式会社 鍛造方法
CN102554084A (zh) * 2010-12-10 2012-07-11 上海重型机器厂有限公司 第三代核电站蒸汽发生器水室封头的锻造方法
CN102554114A (zh) * 2012-01-06 2012-07-11 山东伊莱特重工有限公司 一种大型风电机组用轴承环件锻造碾环加工方法
CN103386585B (zh) * 2012-05-10 2016-01-20 昆山永年先进制造技术有限公司 壳台或管台成形工艺及其所用的反挤压模
CN103143628A (zh) * 2013-03-04 2013-06-12 江苏泽恩汽机车部品制造有限公司 分步骤厚壁拉伸成型模具
CN104107871B (zh) * 2013-04-19 2016-04-27 宝钢特钢有限公司 以镦抛结合平砧旋转锻边方式锻造大型饼件的方法
CN105728607A (zh) * 2016-04-19 2016-07-06 贵州航天新力铸锻有限责任公司 大型双耳u形锻件成型用的坯料
CN107695276A (zh) * 2017-11-08 2018-02-16 浙江申吉钛业股份有限公司 带球形法兰芯轴类零件新的制造工艺和模具

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Publication number Priority date Publication date Assignee Title
US5732587A (en) * 1996-02-26 1998-03-31 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Metallic workpiece having to-be-ironed section and method for forming the same
US5950480A (en) * 1997-06-25 1999-09-14 Sanden Corporation Method for manufacturing shoe for swash plate-type compressor
US5987951A (en) * 1985-03-15 1999-11-23 Weirton Steel Corporation Fabricating one-piece can bodies with controlled side wall elongation
US6000269A (en) * 1997-04-25 1999-12-14 Kataoka; Tetsuji Method of forging and forging equipment
US6545458B2 (en) * 2000-03-30 2003-04-08 Nagase Sangyo Kabushiki Kaisha Low-temperature test equipment

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JP3211157B2 (ja) * 1997-12-22 2001-09-25 株式会社フジユニバンス ベルト式無段変速機のスライドプーリー及びその製造方法
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Publication number Priority date Publication date Assignee Title
US5987951A (en) * 1985-03-15 1999-11-23 Weirton Steel Corporation Fabricating one-piece can bodies with controlled side wall elongation
US5732587A (en) * 1996-02-26 1998-03-31 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Metallic workpiece having to-be-ironed section and method for forming the same
US6000269A (en) * 1997-04-25 1999-12-14 Kataoka; Tetsuji Method of forging and forging equipment
US5950480A (en) * 1997-06-25 1999-09-14 Sanden Corporation Method for manufacturing shoe for swash plate-type compressor
US6545458B2 (en) * 2000-03-30 2003-04-08 Nagase Sangyo Kabushiki Kaisha Low-temperature test equipment

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9636741B2 (en) * 2007-04-19 2017-05-02 Indimet, Inc. Solenoid housing and method of providing a solenoid housing
US20120299673A1 (en) * 2007-04-19 2012-11-29 Indimet Inc. Solenoid housing and method of providing a solenoid housing
US10566122B2 (en) * 2007-04-19 2020-02-18 Indimet Inc. Solenoid housing and method of providing a solenoid housing
US20170243685A1 (en) * 2007-04-19 2017-08-24 Indimet, Inc. Solenoid Housing and Method of Providing a Solenoid Housing
US7823432B2 (en) * 2008-05-16 2010-11-02 Ibaraki Steel Center Co., Ltd. Method of forming spring washer blind-holes into a piston for an automobile transmission
US20090282885A1 (en) * 2008-05-16 2009-11-19 Masakazu Ooka Method of forming spring washer blind-holes into a piston for an automobile transmission
US20110016944A1 (en) * 2009-07-24 2011-01-27 Canon Kabushiki Kaisha Method of producing metallic member
US9079808B2 (en) 2010-10-06 2015-07-14 Nippon Kayaku Kabushiki Kaisha Gas generator, gas generator holder and method for manufacturing gas generator holder
US20140111295A1 (en) * 2011-04-07 2014-04-24 Indimet Inc. Solenoid housing and method of making the same
US9478340B2 (en) * 2011-04-07 2016-10-25 Indimet, Inc. Solenoid housing and method of making the same
US20150020563A1 (en) * 2013-07-18 2015-01-22 GM Global Technology Operations LLC Method for the manufacture of motor vehicle body parts
US10464116B2 (en) 2014-03-28 2019-11-05 Nippon Steel Corporation Method of manufacturing plate-like molded body having a plurality of thickened portions, and plate-like molded body having a plurality of thickened portions
WO2015147297A1 (ja) * 2014-03-28 2015-10-01 新日鐵住金株式会社 複数の増肉部分を有する板状成形体の製造方法及び複数の増肉部を有する板状成形体
US11192162B2 (en) * 2016-04-04 2021-12-07 Thyssenkrupp Steel Europe Ag Method and device for forming a semi-finished product
US11148186B2 (en) * 2017-04-03 2021-10-19 Matec Co., Ltd. Method of manufacturing cup structure

Also Published As

Publication number Publication date
EP1736255A8 (de) 2007-06-20
WO2005099929A8 (ja) 2007-04-12
DE602004030279D1 (de) 2011-01-05
EP1736255B1 (de) 2010-11-24
EP1736255A4 (de) 2007-05-02
EP1736255A1 (de) 2006-12-27
WO2005099929A1 (ja) 2005-10-27
JPWO2005099929A1 (ja) 2007-08-16
CN1784278A (zh) 2006-06-07

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Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TABEI, YOUICHI;ARAKI, TAKASHI;KOUNO, SHINJI;AND OTHERS;REEL/FRAME:018230/0869;SIGNING DATES FROM 20060316 TO 20060828

AS Assignment

Owner name: BOSCH AUTOMOTIVE SYSTEMS CORPORATION, JAPAN

Free format text: CORRECTED ASSIGNMENT DOCUMENT SUBMISSION TO CORRECT THE NAME OF THE ASSIGNEE PREVIOUSLY RECORDED AT REEL/FRAME 018230/0869;ASSIGNORS:TABEI, YOUICHI;ARAKI, TAKASHI;KOUNO, SHINJI;AND OTHERS;REEL/FRAME:018718/0654;SIGNING DATES FROM 20060316 TO 20060828

Owner name: NINOMIYA CO., LTD., JAPAN

Free format text: CORRECTED ASSIGNMENT DOCUMENT SUBMISSION TO CORRECT THE NAME OF THE ASSIGNEE PREVIOUSLY RECORDED AT REEL/FRAME 018230/0869;ASSIGNORS:TABEI, YOUICHI;ARAKI, TAKASHI;KOUNO, SHINJI;AND OTHERS;REEL/FRAME:018718/0654;SIGNING DATES FROM 20060316 TO 20060828

STCB Information on status: application discontinuation

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