EP2080572B9 - 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
EP2080572B9
EP2080572B9 EP08151306A EP08151306A EP2080572B9 EP 2080572 B9 EP2080572 B9 EP 2080572B9 EP 08151306 A EP08151306 A EP 08151306A EP 08151306 A EP08151306 A EP 08151306A EP 2080572 B9 EP2080572 B9 EP 2080572B9
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EP
European Patent Office
Prior art keywords
fastener
cold forging
procedure
shank
diameter
Prior art date
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Application number
EP08151306A
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English (en)
French (fr)
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EP2080572B1 (de
EP2080572A1 (de
Inventor
Yu-Sheng Tseng
Jian-Shiun Tseng
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Individual
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Individual
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Publication date
Priority to SI200830021T priority Critical patent/SI2080572T1/sl
Priority to DE602008000489T priority patent/DE602008000489D1/de
Priority to PT08151306T priority patent/PT2080572E/pt
Priority to DK08151306.1T priority patent/DK2080572T3/da
Priority to PL08151306T priority patent/PL2080572T3/pl
Priority to AT08151306T priority patent/ATE453470T1/de
Priority to EP08151306A priority patent/EP2080572B9/de
Priority to ES08151306T priority patent/ES2339190T3/es
Application filed by Individual filed Critical Individual
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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    • 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: 1. Higher manufacturing cost and more procedures
  • the integral fastener includes higher strength than the raw shaft through the concatenating procedures of formations, the fastener still requires the heat treating procedure to enhance its case hardness, so that the fastener can be smoothly drilled into objects. Additionally, the fastener would facilely become rusty and corrosive by the carburized layer and the additional process for corrosion resistance is necessary, whereby the conventional method results of increasing the cost and adding more excess manufacturing procedures.
  • the procedure of heat treatment may assist the fastener to increase its case hardness but may negatively soften its core hardness susceptible of the high temperature in carburizing and quenching, thus decreasing the elongation of the fastener to result in the broken thereof or difficultly drilling the fastener into objects. Therefore, it would affect the screwing security.
  • 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:
  • the standard value of TABLE 2 is defined according to the value of the fasteners fabricated of iron materials. From the table 2, the elongation and the axial tensile strength of the present invention obviously exceeds the standard level except for the core hardness being located within the range of the level, which indicates the fastener can be well adapted to the automotive demand. Those numerals of the two charts indicate that the present invention is adapted to the relative fields and provides with high hardness and high strength.
  • the experiment carries out both Salt Spray Test and Kesternich Test procedure per DIN 50018 for corrosion tests, and the results indicate that the fastener does not appear patches of rust and corrosion thereon. Therefore, the fastener of the present invention substantially achieves a better corrosion resistance.
  • 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:
  • the present invention takes advantage of cold forging for initially preparing a preliminary shank with higher core and case hardness and subsequently passing through the head, the drilling portion and threads formations to generate the integral fastener with high strength and hardness.
  • the present invention deviates from the conventional heat treatment, which facilitates to decrease the manufacturing cost, improve the corrosion situation and simultaneously enhance the screwing security.

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

Claims (3)

  1. Eine Methode (3) enthält die Schritte für einen hohen starken Befestiger mit Austenit-300-Serie Material zu kaltschmieden:
    eine Vorbereitung (31), während der ein roher Schaft (41) mit Austenit-300-Serie Material und mit einem ersten Durchmesser (d1) vorbereitet wird; der erste Durchmesser (d1) wird durch der Kaltschmiede ursprünglich gequetscht, um ein Durchmesser über 15% kleiner als der erste Durchmesser zu verringern; deshalb ein einleitender Schaft (42) wird mit einem zweiten Durchmesser (d2) erzeugt, und der zweite Durchmesser (d2) ist kleiner als der erste Durchmesser (d1) ; daher kommt es, dass der Schaft (42) höheren Dichte und Festigkeit besitzt, um 1/2 größere Kraft als die des rohen Schafts (41) zu tragen;
    eine Kopfformation (32), während der ein Schraubenkopf (43) an einem Ende des Schaftes (42) geformt wird;
    eine Spitzeformation (33), während der ein Schraubenspitze (44) am anderen Ende des Schaftes (42) geformt wird, und der Schraubenspitze (44) befindet sich am entgegengesetzten Ende des Schraubenkopf (43), und
    eine Gewindeformation (34), während der viele Gewinde (45) zwischen den Kopf (43) und den Schraubenspitze (44) kontinuierlich und spiralig geformt werden; deshalb ein integraler Befestiger (4) ist erfüllt.
  2. Die Methode nach Anspruch 1, dadurch gekennzeichnet, dass ein Verfahren des Bleichens (35) nachdem der Gewinderformation (34) genommen wird, da eine primäre Farbe des Austenit-300-Serie Materialen wiedererlangt wird.
  3. Die Methode nach Anspruch 1, dadurch gezeichnet, dass, ein Verfahren der Korrosionsbeständigkeit (36)nachdem der Gewinderformation (34) genommen wird, da ein äußeres Oberfläche des integralen Befestigers (4) mit einer korrosionsbeständigen Schichte (46) überzieht, um der Korrosionsschutz zu erreichen.
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
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
DK08151306.1T DK2080572T3 (da) 2008-02-12 2008-02-12 Fremgangsmåde til koldsmedning af højstyrkefastgørelsesmiddel af austenitisk 300-serie-materiale
PL08151306T PL2080572T3 (pl) 2008-02-12 2008-02-12 Sposób kucia na zimno wysokowytrzymałego elementu mocującego z materiału austenitycznego serii 300
AT08151306T ATE453470T1 (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
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
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 EP2080572A1 (de) 2009-07-22
EP2080572B1 EP2080572B1 (de) 2009-12-30
EP2080572B9 true EP2080572B9 (de) 2010-07-14

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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)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105478650B (zh) * 2015-12-11 2018-01-23 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
EP4563262A1 (de) 2023-11-30 2025-06-04 SFS Group International AG Verfahren zur herstellung einer rostfreien hochfesten selbstbohrschraube
EP4722547A1 (de) 2024-10-03 2026-04-08 SFS Group International AG Selbstbohrende und gewindefurchende schraube aus edelstahl sowie verfahren zu deren herstellung
EP4480599A3 (de) 2024-10-04 2025-05-07 SFS Group International AG Verfahren zur herstellung einer rostfreien hochfesten selbstbohrschraube

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4233880A (en) * 1978-07-20 1980-11-18 Illinois Tool Works Inc. Stainless steel drill screw
US4296512A (en) * 1979-11-09 1981-10-27 Union Carbide Corporation Method for making fasteners
JP3050620B2 (ja) * 1990-10-17 2000-06-12 日本パワーファスニング株式会社 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

Also Published As

Publication number Publication date
HRP20100179T1 (hr) 2010-04-30
ATE453470T1 (de) 2010-01-15
PT2080572E (pt) 2010-04-06
SI2080572T1 (sl) 2010-04-30
DK2080572T3 (da) 2010-04-12
EP2080572B1 (de) 2009-12-30
ES2339190T3 (es) 2010-05-17
PL2080572T3 (pl) 2010-06-30
DE602008000489D1 (de) 2010-02-11
EP2080572A1 (de) 2009-07-22

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