EP2080572A1 - Verfahren zum Kaltschmieden eines hochfesten Befestigungsteils aus austenitischem Serie-300-Material - Google Patents

Verfahren zum Kaltschmieden eines hochfesten Befestigungsteils aus austenitischem Serie-300-Material Download PDF

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Publication number
EP2080572A1
EP2080572A1 EP08151306A EP08151306A EP2080572A1 EP 2080572 A1 EP2080572 A1 EP 2080572A1 EP 08151306 A EP08151306 A EP 08151306A EP 08151306 A EP08151306 A EP 08151306A EP 2080572 A1 EP2080572 A1 EP 2080572A1
Authority
EP
European Patent Office
Prior art keywords
fastener
procedure
cold forging
shank
diameter
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.)
Granted
Application number
EP08151306A
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English (en)
French (fr)
Other versions
EP2080572B1 (de
EP2080572B9 (de
Inventor
Yu-Sheng Tseng
Jian-Shiun Tseng
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.)
Tseng Jian-Shiun
Tseng Yu-Sheng
Original Assignee
Tseng Jian-Shiun
Tseng Yu-Sheng
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 to ES08151306T priority Critical patent/ES2339190T3/es
Priority to SI200830021T priority patent/SI2080572T1/sl
Priority to PL08151306T priority patent/PL2080572T3/pl
Priority to DK08151306.1T priority patent/DK2080572T3/da
Application filed by Tseng Jian-Shiun, Tseng Yu-Sheng filed Critical Tseng Jian-Shiun
Priority to AT08151306T priority patent/ATE453470T1/de
Priority to EP08151306A priority patent/EP2080572B9/de
Priority to DE602008000489T priority patent/DE602008000489D1/de
Priority to PT08151306T priority patent/PT2080572E/pt
Publication of EP2080572A1 publication Critical patent/EP2080572A1/de
Publication of EP2080572B1 publication Critical patent/EP2080572B1/de
Priority to HR20100179T priority patent/HRP20100179T1/hr
Application granted granted Critical
Publication of EP2080572B9 publication Critical patent/EP2080572B9/de
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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
    • B21K1/00—Making machine elements
    • B21K1/56—Making machine elements screw-threaded elements
    • 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
    • B21K1/44—Making machine elements bolts, studs, or the like
    • B21K1/46—Making machine elements bolts, studs, or the like with heads

Definitions

  • the present invention relates to a method of forming a metal fastener, in particular a method for cold forging high strength fastener with austenitic 300 series material.
  • a conventional method 1 of manufacturing a fastener comprises a sequence of procedures, which include a procedure of preparation 11, a procedure of head formation 12, a procedure of drill point formation 13, a procedure of threads formation 14 and a procedure of heat treatment 15; wherein, a raw shaft 21, made of the austenitic 302 or 304 stainless steel, is initially arranged in the preparation 11 and provides with a first diameter "d" for instance the specification of #12 (approximately of 5.5 mm) and a maximum shearing force approached 2630 pounds. Further, the raw shaft 21 respectively forms a head 23 and a shank 24 extended therefrom and thereafter forms a drilling portion 25 disposed reverse to the head 23 by the formation procedures 12 and 13.
  • a plurality of threads 26 are sequentially convolved on the shank 24 by a thread roller machine, thus obtaining a preliminary fastener.
  • the fastener is susceptible of carburizing and quenching inside a heat furnace for altering the molecular arrangement thereof and is also coated with a carburized layer 27 thereon for increasing the hardness thereof.
  • the above apparatuses here are omitted in Figures.
  • the conventional method may have some disadvantages:
  • the object of the present invention is to provide a method for cold forging high strength fastener with austenitic 300 series material which facilitates to achieve a high strength and an effective corrosion resistance, simultaneously to obtain a rapid manufacture, a lower manufacturing cost and the using security.
  • the method in accordance with the present invention comprises in sequence a procedure of preparation, a procedure of head formation, a procedure of drill point formation, and a procedure of thread formation. That is, preparing an austenitic raw shaft and reducing its diameter by cold forging so as to generate a preliminary shank, which can bear above 1/2 force more than the raw shaft; further passing through the formation procedures in sequence to build an integral fastener.
  • the entire cold forging work facilitates to fabricate the integral fastener with high strength and harness without any additional heating procedures, thus decreasing the manufacturing cost and process; moreover, the fastener has a better elongation to avoid being broken while screwing so as to increase the screwing security.
  • a method 3 of a first preferred embodiment for cold forging a high strength fastener comprises the steps of a process of preparation 31 for preparing a raw shaft 41 having a first diameter " d1 " fabricated of austenitic 300 series material, for instance of 302 or 304 stainless steel, and the raw shaft 41 is initially squeezed by cold forging for reducing above 15% of the first diameter " d1 " and a preliminary shank 42 with a second diameter " d2 " is hence generated.
  • the second diameter "d2" is measured of 5.5mm, and the first diameter should be predetermined at least of 6.325mm, so that the second diameter "d2" smaller than the first diameter " d1 " assists the shank 42 to undertake in excess of 1/2 force to the raw shaft 41, namely the shank 42 is subjected to the maximum shearing force of 4065.25 pounds, extremely larger than the conventional method (2630 pounds).
  • the preliminary shank 42 forms a screw head 43 at one end thereof through a procedure of head formation 32 and the head 43 has a third diameter "d3" greater than the second diameter "d2" of the shank 42.
  • a drilling portion 44 is thereafter cold forged at the other end of the shank 42, reverse to the head 43, so as to increase the hardness of the drilling portion 44.
  • a plurality of screw threads 45 are convolved on the shank 42 by a thread roller machine (not shown), hence an integral fastener 4 is accomplished.
  • the fastener 4 increases its case hardness and strength by passing from the cold forging of the preparation 31, thence to the head and the drill point formation 32, 33, and then to the thread forming formation 34 to impart multiple squeezing forces to the shank 42. Furthermore, the integral fastener 4 can additionally experience a procedure of whitening 35 for cleaning the remnants on the outer surface thereof, thereby retrieving primary colors of the raw austenitic 300 series materials and maintaining a bright appearance.
  • fastener 4 has been previously tested in different areas and provides with some experimental statistics as presented in tabled below: (1) For utilized in construction industry 8 random samples of fasteners made by the present invention and providing with the specification of #12 ⁇ 35 are adopted in the experiment and here the table 1 shows the numerals relative to the hardness, torque, shearing force and loading weight while in screwing: (Referring to Fig.
  • a second preferred embodiment of the present invention still comprises the same procedures of preparation 31 , the head formation 32, the drill point formation 33 and threads formation 34.
  • a procedure of corrosion resistance 36 can be carried out after the threads forming procedure 34 depend on the market demand in order to coat with a rust-resistant layer 46 (as shown in Fig. 7 ) on an outer surface of the integral fastener 4 for achieving superior corrosion protection.
  • the present invention has following advantages:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP08151306A 2008-02-12 2008-02-12 Verfahren zum Kaltschmieden eines hochfesten Befestigungsteils aus austenitischem Serie-300-Material Active EP2080572B9 (de)

Priority Applications (9)

Application Number Priority Date Filing Date Title
PL08151306T PL2080572T3 (pl) 2008-02-12 2008-02-12 Sposób kucia na zimno wysokowytrzymałego elementu mocującego z materiału austenitycznego serii 300
DK08151306.1T DK2080572T3 (da) 2008-02-12 2008-02-12 Fremgangsmåde til koldsmedning af højstyrkefastgørelsesmiddel af austenitisk 300-serie-materiale
PT08151306T PT2080572E (pt) 2008-02-12 2008-02-12 Método para forjagem a frio de um fixador de resistência elevada com um material austenítico da série 300
AT08151306T ATE453470T1 (de) 2008-02-12 2008-02-12 Verfahren zum kaltschmieden eines hochfesten befestigungsteils aus austenitischem serie-300- material
SI200830021T SI2080572T1 (sl) 2008-02-12 2008-02-12 Metoda za hladno kovanje visoko obremenljivih veznih sredstev iz avstenitnega materiala serije 300
DE602008000489T DE602008000489D1 (de) 2008-02-12 2008-02-12 Verfahren zum Kaltschmieden eines hochfesten Befestigungsteils aus austenitischem Serie-300-Material
ES08151306T ES2339190T3 (es) 2008-02-12 2008-02-12 Metodo para forjar en frio un elemento de fijacion de alta resistencia a partir de un material austetinico de la serie 300.
EP08151306A EP2080572B9 (de) 2008-02-12 2008-02-12 Verfahren zum Kaltschmieden eines hochfesten Befestigungsteils aus austenitischem Serie-300-Material
HR20100179T HRP20100179T1 (hr) 2008-02-12 2010-03-29 Postupak hladnog kovanja vijaka visoke čvrstoće iz materijala austenit serije 300

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08151306A EP2080572B9 (de) 2008-02-12 2008-02-12 Verfahren zum Kaltschmieden eines hochfesten Befestigungsteils aus austenitischem Serie-300-Material

Publications (3)

Publication Number Publication Date
EP2080572A1 true EP2080572A1 (de) 2009-07-22
EP2080572B1 EP2080572B1 (de) 2009-12-30
EP2080572B9 EP2080572B9 (de) 2010-07-14

Family

ID=39618967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08151306A Active EP2080572B9 (de) 2008-02-12 2008-02-12 Verfahren zum Kaltschmieden eines hochfesten Befestigungsteils aus austenitischem Serie-300-Material

Country Status (9)

Country Link
EP (1) EP2080572B9 (de)
AT (1) ATE453470T1 (de)
DE (1) DE602008000489D1 (de)
DK (1) DK2080572T3 (de)
ES (1) ES2339190T3 (de)
HR (1) HRP20100179T1 (de)
PL (1) PL2080572T3 (de)
PT (1) PT2080572E (de)
SI (1) SI2080572T1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105478650A (zh) * 2015-12-11 2016-04-13 中国航空工业标准件制造有限责任公司 一种法兰盘螺栓头部热镦成型的方法
EP3945145A1 (de) 2020-07-29 2022-02-02 SFS Intec Holding AG Zn-ni als beschichtungslage auf selbstbohrenden schrauben aus austenitischem edelstahl

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2025810A (en) * 1978-07-20 1980-01-30 Illinois Tool Works Stainless steel drill screws and methods of making
EP0028985A1 (de) * 1979-11-09 1981-05-20 Union Carbide Corporation Verfahren zur Herstellung von Befestigungselementen durch Ziehen gekühlten Drahts oder einer gekühlten Stange
JPH04219512A (ja) * 1990-10-17 1992-08-10 Nippon Power Fuasuningu Kk ステンレス鋼製ドリルねじの製造方法
US6017274A (en) * 1997-09-02 2000-01-25 Automotive Racing Products, Inc. Method of forming a fastener

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2025810A (en) * 1978-07-20 1980-01-30 Illinois Tool Works Stainless steel drill screws and methods of making
EP0028985A1 (de) * 1979-11-09 1981-05-20 Union Carbide Corporation Verfahren zur Herstellung von Befestigungselementen durch Ziehen gekühlten Drahts oder einer gekühlten Stange
JPH04219512A (ja) * 1990-10-17 1992-08-10 Nippon Power Fuasuningu Kk ステンレス鋼製ドリルねじの製造方法
US6017274A (en) * 1997-09-02 2000-01-25 Automotive Racing Products, Inc. Method of forming a fastener

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105478650A (zh) * 2015-12-11 2016-04-13 中国航空工业标准件制造有限责任公司 一种法兰盘螺栓头部热镦成型的方法
EP3945145A1 (de) 2020-07-29 2022-02-02 SFS Intec Holding AG Zn-ni als beschichtungslage auf selbstbohrenden schrauben aus austenitischem edelstahl
US11920624B2 (en) 2020-07-29 2024-03-05 SFS Group International AG Zn-Ni as a coating layer on self-drilling screws of austenitic stainless steel

Also Published As

Publication number Publication date
DE602008000489D1 (de) 2010-02-11
PL2080572T3 (pl) 2010-06-30
DK2080572T3 (da) 2010-04-12
HRP20100179T1 (hr) 2010-04-30
SI2080572T1 (sl) 2010-04-30
ES2339190T3 (es) 2010-05-17
PT2080572E (pt) 2010-04-06
EP2080572B1 (de) 2009-12-30
ATE453470T1 (de) 2010-01-15
EP2080572B9 (de) 2010-07-14

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