US3759080A - Cold forcing method and apparatus for producing a terminal - Google Patents

Cold forcing method and apparatus for producing a terminal Download PDF

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Publication number
US3759080A
US3759080A US00261771A US3759080DA US3759080A US 3759080 A US3759080 A US 3759080A US 00261771 A US00261771 A US 00261771A US 3759080D A US3759080D A US 3759080DA US 3759080 A US3759080 A US 3759080A
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United States
Prior art keywords
punch
diameter
center
die
flange
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Expired - Lifetime
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US00261771A
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English (en)
Inventor
N Sugahara
T Oguri
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Tokai Rika Co Ltd
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Tokai Rika Co Ltd
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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

Definitions

  • ABSTRACT A cold forging method and apparatus for producing a terminal comprising the steps of:
  • the terminal can be manufactured with the same accuracy as that of the cut products in the prior art without causing any waste of the material and the production cost can be reduced remarkably.
  • the present invention relates to a cold forging method for producing a terminal adapted to be inserted into casings or insulating boards of microswitches or other switch devices of synthetic resin and the like from a cylindrical material without causing waste of material.
  • the present invention aims to efficiently manufacture by forging a terminal of the type as described of the same high accuracy as those cut products in the prior art.
  • FIGS. 1 through 4 are vertical sectional front views showing forging sequences from a blank material to a final product
  • FIG. 5 is an inverted view of the finished product
  • FIG. 6 is a longitudinal sectional view of a forging apparatus.
  • a terminal formed in accordance with the method of the present invention is provided with a flange b above a columnar middle portion a, and a plurality of detent projections c on a lower surface of the flange, which projections taper and connects an outer circumference of the middle portion a with an outer circumference of the flange b.
  • a head d Extending from the flange b to the top end, there is a head d which has the same or slightly larger diameter than that of the middle portion a.
  • a deep blind bore e starting from the top surface of the head d to reach an approximately intermediate point of the middle portion a, and internally threaded at h is formed inside the terminal.
  • a projection f of a reduced diameter which is to be used as a rivet for caulking a washer inside a switch or an electrode plate or the like, and a bore g into which a caulking element is to be inserted is formed at an extreme end of the projection f.
  • the thread It is adapted to threadedly receive a threaded plug k.
  • the entire length extending from the lower surface of te middle portion a to the top of the head d is inserted into a synthetic resin member I, upon formation thereof, to provide an anti-drawing action by means of the flange b and a detent action by means of the detent projection c.
  • swaging means a forging process in which a material is striken to shorten its axial length while increasing its diametrical size.
  • the terminal as shown in FIGS. 4 and 5 is manufactured from a cylindrical blank material 1 shown in FIG. I through intermediate products as shown in FIGS. 2 and 3. Therefore, the present invention will now be described referring to those figures as well as FIG. 6.
  • the cylindrical blank material 1 shown in FIG. 1 has been preliminarily cut so that each piece has substantially uniform weight, then polished and annealed to regulate the hardness and then pickled and lubricated.
  • a swaging die 21 of the machine A has a die hole 22 having a diameter substantially corresponding with the outer diameter of the blank material.
  • a hole 23 of a reduced diameter, into which an ejector 26 is inserted is connectingly formed below said die hole 22.
  • Above the hole 22 is formed a hole of an enlarged diameter 25through a short tapered portion 24.
  • a first punch 27 substantially corresponding with the hole 25 in diameter has a small projection 28 centrally provided thereunder.
  • That portion of the blank material fed and inserted into the hole 22 which is located in the enlarged hole 25 is swaged by a strike of the first punch 27 to form a tapered portion 4 and an enlarged head 5 together above the middle portion 3 remaining in the hole 22 and still maintaining the original outer diameter of the blank material.
  • a center projection 6 is formed under the bottom of the portion 3 by extrusion into the hole 23 of the reduced diameter and a shallow recess 7 is formed at the center of the upper surface of the head 5 by a strike of the small projection 28 of the punch.
  • Forming of an intermediate product 8 as shown in FIG. 3 from the intermediate product 2 of FIG. 2 is carried out through a second process using a pre-pressing forging machine B shown in FIG. 6.
  • a pre-pressing die 29 of the machine B is provided with a die hole 30 of a diameter substantially corresponding with the outer diameter of the portion 3, that is the outer diameter of the blank material and an axial length slightly longer than that of the portion 3, and a die hole 32 of an en larged diameter substantially corresponding with the outer diameter of the enlarged head 5, through a tapered portion 31.
  • Centrally below the die hole 30 is a hole 33 of a reduced diameter in which an ejector 34 is inserted with its upper surface disposed slightly below the upper face of the reduced hole 33.
  • a second punch 35 is substantially the same in diameter as the shallow recess 7 and longer than that in axial length.
  • the portion 3 of the intermediate product 2 maintaining the original outer diameter of the blank material is fed and inserted into the die hole 30 so that the taper 4 engages with the tapered portion 31, and the second punch 35 is driven deeply into the center of the recessed hole 7.
  • the punch 35 driven as deep as half of the total length of the portion 3, the center projection 6 is extruded increasingly until it reaches the upper surface of the ejector 34 to form a shaft 6a.
  • the upper half of the portion 3, the tapered portion 4 and the en larged head 5 are extruded behind the second punch and extended in length respectively to form an extended middle portion 3a still maintaining the original outer diameter of the blank material, an extended tapered portion 4a and an extended enlarged head 5a as well as a deep center bore 7a having a diameter substantially corresponding with the outer diameter of the second punch 35.
  • Forming of the flnal productas shown in FIGS. 4 and 5 from the intermediate product 8 of FIG. 3 is carried out through a third process using a finalforging press machine C shown in FIG. 6.
  • a forming die 36 of the machine C is formed a die hole 37 whose length is substantially equal to the length from the bottom of the middle portion a of the intended product to the lower end of the flange b and whose diameter is substantially equal to the inner diameter of the die hole 30.
  • a flange forming die hole 38 of enlarged diameter which opens in the upper surface of the die 36.
  • a third punch 43 comprises three parts, that is, a center punch 44 having the same diameter as that of the second punch 35, a tubular stripper 45 slidably fitted around the outer periphery of the center punch 44 and biased by a spring 46, and an outer punch 47 encircling the outer periphery of the stripper 45.
  • the inner diameter of the outer punch 47 is made to correspond with the outer diameter of the head d of the product shown in FIG. 4.
  • the extended portion 3a of the intermediate product 8 maintaining the original outer diameter of the blank material is fed and inserted into the die hole 37 of the forming die 36 so that the extended tapered portion 4a engages with a shoulder 37a at the upper end of said hole 37, and the extended enlarged head 5a protrudes above the upper surface of the die 36.
  • the third punch 43 descends to start the forming operation.
  • the center punch 44 reaches near the bottom of the Center bore 7a to sustain the inner face thereof so as not to be changed in diameter
  • the stripper 45 compresses the spring 46 upward through an abutment 48, which in turn abuts against an abutment 49 of the outer punch 47 as shown in FIG. 6 thereby to press the upper surface of the head 50.
  • the outer punch 47 presses its lower surface against the upper surface of the forming die 36 to block the flange forming die hole 38.
  • the entire inter mediate product 8 is pressed and a part of the extended tapered portion 4a is urged into the slanting grooves 39 to form equiangularly spaced detent projections 0, while the remaining part of the tapered portion 4a is squeezed by the shoulder 37a to reduce its diameter and connect with the columnar portion a of the final product which is formed from the extended portion 30 having the original outer diameter of the blank material.
  • the lower surface of the shaft 60 pressed down into the ejector containing hole 40 is correlatively pressed by the cone 42 of the ejector 41 to provide shaping of the projection f of reduced diameter and forming of a press-in hole
  • the stripper 45 presses the extended enlarged head 5a, to swage it into a chamber blocked by the outer punch 47 and the forming die 36 that is the flange forming die hole 38 thereby to form the flange b.
  • the head d is formed through enlargement of the diameter so as to correspond with the inner diameter of the outer punch 47, and in the center hole 70 held its shape by the center punch 44 is formed a blind bore e.
  • the center punch 44 in the third punch 43 of the final forging press machine C may be provided with, instead of the stripper 45, a peripheral step of enlarged diameter which is equal to that of the stripper.
  • the present invention relates to forming of'a terminal as shown in FIGS. 4 and 5 from a cylindrical blank material 1 by means of cold forging method, in which there occurs no waste of material such as chip or the like which would inevitably arise in the prior cutting method.
  • the present invention also allows forming of the terminal in a precise shape and highly improves forming efficiency and hence enables the production cost to be reduced remarkably.
  • a cold forging method for producing a terminal comprising the steps of:
  • a cold forging apparatus for producing a terminal which comprises; a swaging press machine including a swaging die having a first die hole comprised of a first portion of substantially the same diameter as the diameter of a cylindrical blank material, a second portion of enlarged diameter formed above said first portion and connected therewith through a first tapered portion and a third portion of reduced diameter into which a first ejector is inserted and formed below and connected with said first portion; a first punch substantially corresponding in diameter with said second portion and having a small projection centrally provided thereunder, said first punch being adapted for swaging said cylindrical material in said swaging die to form an enlarged head portion having a shallow recess and a center projection respectively above and below a midde portion having the original outerdiameter of the blank material; a pre-pressing forging machine including a pre-pressing die having a second die hole comprised of a first section of substantially the same diameter as the diameter of said middle portion and an axial length slightly longer than that of said middle portion,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US00261771A 1971-06-14 1972-06-12 Cold forcing method and apparatus for producing a terminal Expired - Lifetime US3759080A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46042410A JPS5147659B1 (enrdf_load_stackoverflow) 1971-06-14 1971-06-14

Publications (1)

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US3759080A true US3759080A (en) 1973-09-18

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US00261771A Expired - Lifetime US3759080A (en) 1971-06-14 1972-06-12 Cold forcing method and apparatus for producing a terminal

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US (1) US3759080A (enrdf_load_stackoverflow)
JP (1) JPS5147659B1 (enrdf_load_stackoverflow)
DE (1) DE2228986A1 (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893325A (en) * 1973-07-10 1975-07-08 Yoshio Sato Process for manufacturing a base for a semiconductor device
US4078415A (en) * 1975-12-23 1978-03-14 Peltzer & Ehlers Process of manufacturing shaped bodies by cold shaping
US4147049A (en) * 1977-06-16 1979-04-03 Textron, Inc. Drawing heavy walled parts
US4287747A (en) * 1978-07-18 1981-09-08 Nissan Motor Co., Ltd. Process of closed extrusion shaping of a metal rod material and an apparatus therefor
US6357274B1 (en) * 1999-10-21 2002-03-19 Denso Corporation Sparkplug manufacturing method
WO2004043626A1 (en) * 2002-11-12 2004-05-27 Amafa Service Srl. Methods for the cold extrusion of metallic elements with dead or through holes and plant for carrying out said methods
US20040110569A1 (en) * 2002-12-06 2004-06-10 Avk Industrial Products, A Division Of Sps Technologies Inc. Blind threaded fastener forming technique
US20050039514A1 (en) * 2003-08-20 2005-02-24 Inch Gordon R. Scallop output shaft tools
US20060048559A1 (en) * 2004-09-07 2006-03-09 Chien-Chuan Huang Method for making punch head of paper punch
WO2006061863A1 (en) * 2004-12-10 2006-06-15 Amafa Service S.R.L. Press unit provided of multiple dies for obtaining manufactured products
US20080216550A1 (en) * 2004-07-13 2008-09-11 National Machinery Llc Forged roller
US20120090375A1 (en) * 2009-06-17 2012-04-19 Yongnian Yan Zoning closed-die extruding device and method
EP2226136A3 (en) * 2009-03-03 2015-03-04 NGK Spark Plug Co., Ltd. Method of producing metallic shell for spark plug and die for producing the metallic shell
US20170011833A1 (en) * 2011-04-07 2017-01-12 Indimet Inc. Solenoid Housing and Method of Making the Same
CN108817290A (zh) * 2018-06-25 2018-11-16 太仓久信精密模具股份有限公司 一种喷油嘴针阀体冷挤压成形工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3475490D1 (en) * 1984-09-01 1989-01-12 Koenig Metallwarenfab Gmbh Method of making an extruded fitting for panel radiators

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3036367A (en) * 1957-12-23 1962-05-29 Thompson Ramo Wooldridge Inc Method of making ball studs
US3186209A (en) * 1960-04-14 1965-06-01 Nat Machinery Co Method of cold forming an elongated hollow article
US3267500A (en) * 1963-09-18 1966-08-23 Nat Machinery Co Apparatus for forming hollow articles
US3555673A (en) * 1966-12-16 1971-01-19 Aerpat Ag Electrical connector socket
US3651683A (en) * 1969-03-15 1972-03-28 Rudolf Liebergeld Cold moulding press
US3665600A (en) * 1969-07-25 1972-05-30 Auto Swage Products Inc Method of forming electrical connectors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3036367A (en) * 1957-12-23 1962-05-29 Thompson Ramo Wooldridge Inc Method of making ball studs
US3186209A (en) * 1960-04-14 1965-06-01 Nat Machinery Co Method of cold forming an elongated hollow article
US3267500A (en) * 1963-09-18 1966-08-23 Nat Machinery Co Apparatus for forming hollow articles
US3555673A (en) * 1966-12-16 1971-01-19 Aerpat Ag Electrical connector socket
US3651683A (en) * 1969-03-15 1972-03-28 Rudolf Liebergeld Cold moulding press
US3665600A (en) * 1969-07-25 1972-05-30 Auto Swage Products Inc Method of forming electrical connectors

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893325A (en) * 1973-07-10 1975-07-08 Yoshio Sato Process for manufacturing a base for a semiconductor device
US4078415A (en) * 1975-12-23 1978-03-14 Peltzer & Ehlers Process of manufacturing shaped bodies by cold shaping
US4147049A (en) * 1977-06-16 1979-04-03 Textron, Inc. Drawing heavy walled parts
US4287747A (en) * 1978-07-18 1981-09-08 Nissan Motor Co., Ltd. Process of closed extrusion shaping of a metal rod material and an apparatus therefor
US6357274B1 (en) * 1999-10-21 2002-03-19 Denso Corporation Sparkplug manufacturing method
WO2004043626A1 (en) * 2002-11-12 2004-05-27 Amafa Service Srl. Methods for the cold extrusion of metallic elements with dead or through holes and plant for carrying out said methods
RU2323061C2 (ru) * 2002-11-12 2008-04-27 Амафа Сервис Срл. Способы холодного прессования для получения металлических деталей с глухими или сквозными отверстиями и установка для осуществления указанных способов
US20050145004A1 (en) * 2002-11-12 2005-07-07 Alessandro Vescovini Methods for the cold extrusion of metallic elements with dead or through holes and plant for carrying out said methods
US7347075B2 (en) 2002-11-12 2008-03-25 Amafa Service S.R.L. Methods for the cold extrusion of metallic elements with dead or through holes and plant for carrying out said methods
CN1329141C (zh) * 2002-11-12 2007-08-01 阿马法服务有限责任公司 用于带有盲孔或通孔的金属元件的冷挤压的方法和实施该方法的装置
US20040110569A1 (en) * 2002-12-06 2004-06-10 Avk Industrial Products, A Division Of Sps Technologies Inc. Blind threaded fastener forming technique
US6857962B2 (en) * 2002-12-06 2005-02-22 Avk Industrial Products, A Division Of Sps Technologies Inc. Blind threaded fastener forming technique
US7036349B2 (en) * 2003-08-20 2006-05-02 American Axle & Manufacturing, Inc. Scallop output shaft tools
WO2005018849A3 (en) * 2003-08-20 2006-01-26 American Axle & Mfg Inc Scallop output shaft tools
US20050039514A1 (en) * 2003-08-20 2005-02-24 Inch Gordon R. Scallop output shaft tools
US20080216550A1 (en) * 2004-07-13 2008-09-11 National Machinery Llc Forged roller
US7634934B2 (en) * 2004-07-13 2009-12-22 National Machinery Llc Forged roller
US20060048559A1 (en) * 2004-09-07 2006-03-09 Chien-Chuan Huang Method for making punch head of paper punch
WO2006061863A1 (en) * 2004-12-10 2006-06-15 Amafa Service S.R.L. Press unit provided of multiple dies for obtaining manufactured products
EP2226136A3 (en) * 2009-03-03 2015-03-04 NGK Spark Plug Co., Ltd. Method of producing metallic shell for spark plug and die for producing the metallic shell
US20120090375A1 (en) * 2009-06-17 2012-04-19 Yongnian Yan Zoning closed-die extruding device and method
US20170011833A1 (en) * 2011-04-07 2017-01-12 Indimet Inc. Solenoid Housing and Method of Making the Same
CN108817290A (zh) * 2018-06-25 2018-11-16 太仓久信精密模具股份有限公司 一种喷油嘴针阀体冷挤压成形工艺
CN108817290B (zh) * 2018-06-25 2024-05-03 太仓久信精密模具股份有限公司 一种喷油嘴针阀体冷挤压成形工艺

Also Published As

Publication number Publication date
DE2228986A1 (de) 1972-12-21
JPS5147659B1 (enrdf_load_stackoverflow) 1976-12-16

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