US3769103A - Method of heat treating articles - Google Patents

Method of heat treating articles Download PDF

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Publication number
US3769103A
US3769103A US00128040A US3769103DA US3769103A US 3769103 A US3769103 A US 3769103A US 00128040 A US00128040 A US 00128040A US 3769103D A US3769103D A US 3769103DA US 3769103 A US3769103 A US 3769103A
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United States
Prior art keywords
thread
articles
screw
zone
heating
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Expired - Lifetime
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US00128040A
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English (en)
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C Wardwell
N Holcomb
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Research Engineering and Manufacturing Inc
SPX Technologies Inc
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Research Engineering and Manufacturing Inc
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Assigned to AMCA INTERNATONAL CORPORATION, A CORP. OF DE., PHIPARD, HARVEY F., JR. reassignment AMCA INTERNATONAL CORPORATION, A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RESEARCH ENGINEERING & MANUFACTURING, INC., A CORP. OF MA.
Assigned to AMCA INTERNATIONAL CORPORATION, A CORP OF DELAWARE reassignment AMCA INTERNATIONAL CORPORATION, A CORP OF DELAWARE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMTEL, INC., A CORP OF RI.
Assigned to RESEARCH ENGINEERING & MANUFACTURING, INC., A CORP OF MASSACHUSETTS reassignment RESEARCH ENGINEERING & MANUFACTURING, INC., A CORP OF MASSACHUSETTS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMCA INTERNATIONAL CORPORATION, A CORP OF DE.
Assigned to AMTEL, INC. reassignment AMTEL, INC. MERGER (SEE DOCUMENT FOR DETAILS). JANUARY 22, 1986 Assignors: RESEARCH ENGINEERING & MANUFACTURING, INC.
Assigned to RESEARCH ENGINEERING & MANUFACTURING, INC. reassignment RESEARCH ENGINEERING & MANUFACTURING, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PHIPARD, HARVEY F., JR.
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Assigned to ROCKFORD PRODUCTS CORPORATION reassignment ROCKFORD PRODUCTS CORPORATION RELEASE OF PATENT LICENSES Assignors: CONGRESS FINANCIAL CORPORATION (CENTRAL)
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S148/00—Metal treatment
    • Y10S148/902—Metal treatment having portions of differing metallurgical properties or characteristics
    • Y10S148/907—Threaded or headed fastener

Definitions

  • An article is hardened or tempered in a localized zone. Where the article is a thread-forming device the zone is that part of its thread that does the threadforming in the workpiece. The hardness of the remainder of the body of the article is left unchanged.
  • the localized hardening is carried out by a method that includes high frequency induction heating only of the zone followed by quenching of the zone whereby the hardened zone is a skin of predetermined depth.
  • a machine for making articles in accordance with the method comprises means for delivering the articles in succession to an induction heating element, a mechanism for advancing the articles through the heating element for progressive heating of the surface of the article in the localized zone to a predetermined depth, a quenching manifold for applying a spray of quenching liquid to the heated article, and means for removing the heated articles from the heating element and conveying them to the quenching manifold.
  • Case hardening involves heat treating in a special atmosphere, usually one that is enriched in carbon.
  • the screw or other workpiece is heated through its entire body, and during the heating the carbon penetrates a predetermined distance into the body.
  • the carburized skin forms a hardened shell or case.
  • a mild temper for stress relief may follow the quenching operation.
  • the zone of hardness is controlled or limited to a predetermined depth necessary to provide the workentering portion of the thread with such hardness as may be necessary to withstand the thread-forming pressure from the workpiece.
  • the thread-forming portion or zone need not have a knife edge as in a thread cutting device.
  • a further object of this invention is to provide a thread-swaging screw in which the depth of hardness of the localized zone is reasonably consistent throughout the circumference of the screw at such zone.
  • the thread-swaging screw may be of various known types; however, a type having an arcuate polygonal crosssection with arcuate sides and arcuate intermediate thread-swaging lobes is a particularly suitable form of this invention.
  • the core of the article that is surrounded by the hardened zone as well as the remainder of article remote from the zone is left substantially unchanged as to hardness.
  • the method is particularly suitable for thread-swaging screws of the type stated, but the principles are applicable to other kinds of threadforming devices (e. g. taps, locking screws or bolts) or to other types of screws wherein the hardening or tempering of only a portion of the article is desired.
  • the induced field results in a skin effect heating to a predetermined depth that may be controlled so as to be no greater than is acutally needed.
  • the process is carried out in ordinary ambient air.
  • a further object of this invention is to provide a machine for carrying out the aforesaid method to produce the zone hardened articles on a continuous flow, massproduction basis, or to temper articles on a mass-flow basis.
  • a more specific object of this invention is to provide a machine that comprises an induction heating element for heating articles only in a desired localized zone, mechanism for feeding the articles automatically to said induction heating element, mechanism for autorriatically removing the heated articles from the heating element, and a quenching manifold for spraying a quenching liquid, such as water or oil, onto the heated zone while the latter is still sufficiently hot to produce the desired hardness.
  • the machine is principally intended for zone hardening of screws, but other elongated articles might also be zone hardened by the machine.
  • articles such as thread-forming screws, are supplied from a hopper to a raceway in which the screws are fed, one at a time, by a pusher mechanism onto a support so that the shanks of the screws are disposed between and perpendicular to the general plane defined by parallel bars that form part of a single turn induction heater.
  • the height of the bars and their positions relative to the shanks of the screws are such that the bars induce a current field locally into the selected zone of each shank peripherally therearound.
  • a group of screws is positioned in abutting parallel relation between the bars so that the screws are progressively heated as they are pushed through the path between the bars in a step-by-step manner by the pusher.
  • An escapernent mechanism is interposed in the second raceway adjacent to the discharge end of the quenching manifold to allow a quenched screw to be released for further movement down the raceway to a receptacle as soon as a heated screw is discharged from the induction heater and approaches the quenching manifold.
  • FIG. 1 is a fragmentary perspective view showing portions of a machine constructed in accordance with and embodying the present invention
  • FIG. 2 is a fragmentary and elevational view of the machine
  • FIG. 3 is a front elevational view thereof
  • FIG. 4 is an enlarged fragmentary sectional taken along line 4-4 of FIG. 3;
  • FIGS. 5 and 6 are fragmentary sectional views taken along lines 5-5 and 6-6 respectively of FIG. 4;
  • FIGS. 7 and 8 are fragmentary sectional views taken along lines 7-7 and 8-8 respectively of FIG. 6;
  • FIG. 9 is a perspective view of the induction heating element that forms part of the present invention.
  • FIG. 10 is a fragmentary plan view as seen from line 10-10 of FIG. 2;
  • FIG. 11 is a fragmentary sectional view taken along line 11-11 of FIG. 10;
  • FIG. 12 is an enlarged fragmentary sectional view taken approximately along line 12-12 of FIG. 11;
  • FIG. 13 is a fragmentary sectional view taken along line 13-13 of FIG. 12;
  • FIG. 14 is an enlarged fragmentary sectional view taken approximately along line 14-14 of FIG. 3;
  • FIG. 15 is an enlarged fragmentary sectional view taken along line 15-15 of FIG. 14;
  • FIG. 16 is a fragmentary longitudinal sectional view of a thread-forming screw constructed in accordance with and produced by the method of the present invention.
  • FIG. 17 is a sectional view taken along line 17-17 of FIG. 16.
  • the screw 2 includes a'shank 4 having a helical thread 6 thereon.
  • the thread 6 includes a threadswaging portion 8 at which the crest of the thread is of progressively decreasing diameter toward the workentering end 10 of the screw.
  • the cross-section of the thread defines a regular polygon with an odd number of sides. This crosssectional configuration may be present throughout the full length of the thread 6 or it may simply be in the thread-swaging zone 8 and such lead section 12 as may be present.
  • the crosssection of the thread defines three arcuate sides 14, l5, 16 with arcuate intermediate threadswaging lobes l7,
  • the screw 2 also has a head 20 that is larger in diameter than the adjacent part of the shank 4.
  • the machine generally designated at 22, comprises a hopper 24 for holding a supply of screws 2.
  • the hopper includes a feeding mechanism of known type for feeding the screws one by one into a downwardly inclined raceway 26.
  • the raceway 26 is mounted at the desired angle of inclination on an upstanding support 28 which is, in turn, mounted on a suitable frame portion 30 of the machine.
  • the raceway support 28 includes side members 32, 32 that are bolted to end blocks 34, 34. Passing through the end blocks 34, 34 are bolts 36, 36 for threaded engagement with rails 38, 38.
  • the screw head 20 rests on the tops of the rails 38, 38 and the screw shank 4 projects into the gap between the rails 38, 38.
  • the bolts 35 are disposed in elongated slots 40, one such slot being shown in FIG. 7.
  • a hold down bar 42 is disposed above the rails 38, 38 andis adjustably positioned so that the heads of the screws when on the rails 38, 38'keep the screws perpendicular to the raceway.
  • the mounting for the hold down bar 42 includes two assemblies 43, 43 each having a bracket 44 that is bolted to one of the side members 32. At its upper end the bracket has a flange 46 for receiving the threaded stud 48, the lower end of which is secured to the hold down bar 42.
  • a coil spring 50 encircles the stud 48 and is interposed between the flange 46 and the hold down bar 42, and above the flange 46 a hand screw 52 is threaded onto the stud 48.
  • the position of the hold down bar 42 may be adjusted relative to the rails 38, 38.
  • the feeding mechanism within the hopper 24 should maintain a supply of screws 2 in the raceway 26.
  • a light source 54 and a photocell 56 that may be used to control the motor that operates the feeder within the hopper-24.
  • the feeder begins to operate to discharge screws from the hopper 24 into the raceway 26.
  • the machine has an induction heating element 58 and related structure 59 for mounting the element in place and for providing a slide-support for the screws that pass through the element 58.
  • the heating element is in the nature of a one turn induction coil.
  • the element 58 is a tubular copper member of rectangular crosssections (see FIG; 8) having spaced parallel bars 60, 60, the forward ends of which have downturned legs 62, 62 that are cross connected by an end section 64. At its opposite ends there areadditional depending legs 66, 66 which are electrically and mechanically connected through fittings 68, 68 to electrical tubular copper leads 70, 70.
  • the leads 70, 70 may be clamped in a suitable manifold 72 (FIGS. 4 and 6).
  • the element 58 may be coated with glass or ceramic 61 for insulation purposes.
  • Current may be supplied to the leads 70, 70 from an induction heating generator 74 (FIG. 2) through a pair of tubular supply lines 76 that are respectively connected to the leads 70, 70.
  • cooling water may be circulated from a suitable source of supply through the lines 76 and the leads 70 to the coil 58 to maintain the coil at the desired operating temperature.
  • the electric current supply to the coil is preferably of a radio frequency and may be of the order of 400K112.
  • the structure 59 includes a base plate 78 that is bolted or otherwise rigidly secured to a frame portion 80 of the machine.
  • Bolted to the upper surface of the base plate 78 are spacer blocks 80 that support an upper block 82.
  • the upper block 82 is secured to the spacer blocks 80 by hand screws 84, 84.
  • On top of the block 82 are dielectric members 86, 86 which are dispoed on opposite sides of the coil bars 60, 60.
  • the members 86, 86 may be secured to the block 82 by fiber nuts and studs 88.
  • Ceramic plates 90 that provide a relatively low friction surface for engagement by the heads of the screws 2 as the screws pass between the coil bars 60, 60.
  • insulating glass spacer rods 92, 92 Interposed between the upper surfaces of the bars 60, 60 and the ceramic plates 90 are insulating glass spacer rods 92, 92.
  • the heating is confined to the localized area of the thread-swaging zone 8 leaving substantially unheated the core of the screw that surrounds the heated zone and the parts of the screw axially remote therefrom.
  • the heating is progressive and may be readily controlled so that just the proper amount of depth of heating in the localized zones is attained.
  • the depth and length of the heated zone need only be that sufficient to withstand the thread-forming pressures to which the screws are intended to be subjected during use.
  • FIGS. 4 and 5 Suitably secured to the frame of the machine is an upstanding motor bracket 96 having a top plate 98 upon which is mounted a variable speed feeder motor 100.
  • the top plate 98 is apertured for receiving the motor shaft which has thereon a crank 102 that is journalled at one end of a connecting rod 104.
  • the other end of the connecting rod 104 is journalled on a pin 106 that is secured to a yoke 108.
  • the yoke 108 carries with it a depending angle bracket 110 which, in turn, carries a pusher 112.
  • the angle bracket 110 is adjustably secured to the yoke 108 by bolt 114 while the pusher 112 is adjustably secured to the angle bracket 110 by bolt 116. This allows for adjustments for various sizes of screws being processed.
  • the pusher 112 reciprocates .and has a stroke as determined by the throw of the crank 102.
  • a flange 118 is bolted to the motor bracket 96 for'rigidly supporting spaced parallel guide pins 120, 120.
  • Nuts 122, 122 retain the guide pins in place.
  • the edge 124 of the pusher 112 engages the bottommost screw in the raceway 26 and pushes it into the space between the coil'bars 60, 60 to commence the zone heating of the screw.
  • An anti-jam feature of the pusher 112 is also provided.
  • the vertical arm portion 126 of the pusher 112 is rigidly secured to a member 128 that is slidable within the horizontal portion 130 of the pusher 112.
  • a spring 132 is operatively interposed between the leading end of the slidable member 128 and the vertical arm portion 126. This biases the arm portion 126, into abutting relationship with the portion 130.
  • the leading edge 124 meets excessive resistance due to jamming of the machine, the member 128 will slide relative to the portion 130 causing the spring 132 to expand. The member 126 and the member 128 will then be able to move to the left (FIG. 4) relative to the member 130 to take up the stroke of the mechanism.
  • a plurality of screws 2 with the heads thereof in abutting relationship are supported on the ceramic plates 90 for step-bystep movement between the bars 60 so that each screw becomes locally heated a sufficient amount as it reaches the left hand end (FIGS. 4 and 6) of the heater.
  • the left hand end of the heater is suitably provided with a device for removing the heated screw and delivering the screw to a downwardly inclined raceway 134 for movement to a water quenching device, which forms part of the machine.
  • This feed off mechanism comprises a motor 136 that is mounted on a bracket 97 and includes a shaft 138 that has a feed off roller 140 overlying the ceramic plate 40 at the end of the coil. The periphery of the feed roller 140 engages the fully heated screw at the head thereof each time the pusher 112 feeds a screw from the raceway 26 into the space between the bars 60, 60.
  • the raceway 134 comprises opposed plates 142, 142 on which the head of the screw slides, and the plates define a gap 144 through which the screw shank projects.
  • the raceway plates 142, 142 may be mounted on the frame of the machine by a support structure 135.
  • a first electric eye control mechanism comprising a light transmitting source 146 and a photocell 148 that actuates a time delay safety mechanism. If a screw does not, within a specified period of time, interrupt the light beam, the machine is shut off. This may occur, for instance, should the machine jam.
  • a second photocell control arrangement comprising a light transmitting source 150 and a photocell 152 for the purpose of operating an escapement mechanism, to be hereinafter described.
  • a hold down member 154 is provided to maintain the screws 2 in the raceway in the proper positions, that is generally perpendicular to the plates 142, 142.
  • the hold down member 154 includes brackets 156, 156 that are mounted on one of the plates 142 and contain adjusting screws 158 by which the height of the member 154 relative to the raceway 134 may be adjusted for different sizes of screws.
  • quenching manifolds 164, 164 mounted on and depending from the raceway 134 a pair of opposed quenching manifolds 164, 164.
  • quenching manifolds 164i, 164 are orifices 166, which are disposed along a substantial length of the raceway 134 and provide a means by which quenching liquid, such as water or oil, may be applied to the heated screws in the localized zone at which the screws are heated in the induction heating element 58.
  • quenching manifolds 164, 164 should be mounted at distances below the raceway plates 142, 142 such that the orifices 166 are approximately in alignment with the locally heated thread-swaging zone 8, as seen in FIG. 15.
  • Water for the quenching manifold may be stored in a suitable'reservoir or tank 168 (FIG. 2).
  • a pump 170 driven by electric motor 172, draws water from the tank 168 and delivers the water under pressure to manifold piping 174 which connects with pipe sections 176, 176 (FIG. for delivery of the fluid to the respective manifolds 164, 164.
  • the quenching water that impinges upon the screws drops downwardly between the manifolds and may be suitably collected for recirculation to the supply tank 168.
  • the initial quenching is quite rapid, which gives desired hardness properties to the localized zone. Further cooling of the screws 2 takes place at the lower portions of the quenching manifolds 164 where, as shown in FIG. 10, several screws 2 may be positioned, the lowermost of which is in abutment with an escapement mechanism 178.
  • the escapement mechanism 178 is of a type that is capable of operating faster than the normal machine feed and independently thereof.
  • the escapement mechanism 178 includes a sector-shaped member 180 that is journalled for rocking movement on a pin 182, the pin 182 being carried by an escapement mounting bracket 184 that is bolted to one of the raceway plates 134.
  • a pneumatic piston and cylinder assembly 186 is pivotally connected to the member 180 and also pivotally connected to the bracket 184, the connection to the latter being at pivot pin 188.
  • the piston of the assembly 186 operates to rock the escapement member 180 back and forth through one cycle of operation when the stack or group of screws fills the raceway 134 up to the beam from the light source 150.
  • the photocell 152 controls the actuation of the piston and cylinder assembly 186.
  • the arrangement of suitable valves for the assembly 186 and the manner of operating them by the photocell 152 can be carried out in accordance with known techniques.
  • Arcuate plates 189, 189 are bolted to the free ends of the sector member 180 and present portions 190, 192 that define an opening 194 (FIG. 12).
  • a screw 2 will drop into the opening 194 and will be held therein between the portions 190, 192.
  • the offset portion 192 will be out of the way of the screw in the opening 15M so that the screw will slide freely down the raceway 134 to a receptacle below.
  • the next screw in line abuts the up raceway side of the member 190.
  • the plate 189 moves back counterclockwise past dead center, the aforesaid next screw will become lodged in the opening 194.
  • the screws 2 thus treated are now locally hardened uniformly in an annular zone which is of a predetermined depth from the periphery of the swaging portion 8 of the screw thread.
  • Such depth of hardness is indicated by the line 94 in FIGS. 16 and 17.
  • This depth may be only a minor fractional part of the nominal diameter of the screw threads and need encompass only a few turns of the thread, namely those that do the threadswaging in the work.
  • the core of the screw surrounded by the locally hardened zone and the part of the screw axially of the hardened zone is of optimum hardness for intended use. Those regions are essentially unchanged as to composition or grain structure as a result of the process of this invention.
  • a method that comprises providing an induction heating device that produces a region with a .high frequency alternating current field, passing said discrete articles through said field progressively such that a number of said articles are similarly oriented in said field at one time and the articles in said field are inductively coupled, and by said inductive heating locally heating the articles in their respective zones circumferentially therearound, and then quenching each article at its zone to leave a hardened part of a depth that includes at least a portion of the thread thereat while leaving a core of the shank that is surrounded by said hardened part and a portion of the shank remote from said zone substantially unchanged as to hardness.
  • a method according to claim 3 in which a plurality of screws are disposed between said bars at one time and the screws are advanced along said bars progressively.
  • a method that comprises providing an induction heating device that produces a region with a high frequency alternating current field, passing said discrete articles through said field for inductive heating and by said inductive heating locally heating the articles in their respective zones circumferentially therearound, and then quenching each article at its zone to leave a hardened part of a depth that includes at least a portion of the thread thereat while leaving a core of the shank that is surrounded by said hardened part and a portion of the shank remote from said zone substantially unchanged as to hardness.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
US00128040A 1971-03-25 1971-03-25 Method of heat treating articles Expired - Lifetime US3769103A (en)

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US12804071A 1971-03-25 1971-03-25

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US05/334,705 Expired - Lifetime US4112812A (en) 1971-03-25 1973-02-22 Heat-treated article

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US (2) US3769103A (enrdf_load_stackoverflow)
JP (1) JPS5525289B1 (enrdf_load_stackoverflow)
AU (1) AU471188B2 (enrdf_load_stackoverflow)
BE (1) BE780527A (enrdf_load_stackoverflow)
CA (1) CA950808A (enrdf_load_stackoverflow)
DK (1) DK131384B (enrdf_load_stackoverflow)
FR (1) FR2130676B1 (enrdf_load_stackoverflow)
GB (2) GB1376025A (enrdf_load_stackoverflow)
IT (1) IT952337B (enrdf_load_stackoverflow)
SE (2) SE391194B (enrdf_load_stackoverflow)

Cited By (11)

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US4021274A (en) * 1975-03-26 1977-05-03 Russell, Birdsall & Ward, Inc. Method for heat treating by induced current
US6086305A (en) * 1999-01-13 2000-07-11 Illinois Tool Works Inc. Nails having selected heat treatment and hardening
US6109851A (en) * 1999-01-13 2000-08-29 Illinois Tool Works Inc. Screws having selected heat treatment and hardening
LU90537B1 (de) * 2000-03-02 2001-09-04 Trefil Arbed Bissen S A Nagel
US6436474B2 (en) 1999-01-13 2002-08-20 Illinois Tool Works Inc. Method of chemically coating fasteners having improved penetration and withdrawal resistance
US6758921B1 (en) * 1999-09-02 2004-07-06 Benteler Ag Method of manufacturing a bending-resistant, torsionally yielding tubular profiled member as a transverse support for a twist beam rear axle of a passenger car
US20040235576A1 (en) * 2003-04-08 2004-11-25 Ejot Gmbh & Co Kg Screw with a partially hardened functional tip and process for the production thereof
US20070243043A1 (en) * 2006-04-17 2007-10-18 Acument Intellectual Properties, Llc High performance thread forming screw
US20120223518A1 (en) * 2009-11-06 2012-09-06 Yazaki Kako Corporation Thin joint member producing method and pair of thin joint members
US10662993B2 (en) * 2017-02-01 2020-05-26 Kamax Holding Gmbh & Co. Kg High-strength screw including an unhardened thread end
CN112680584A (zh) * 2020-11-27 2021-04-20 上海宏挺紧固件制造有限公司 一种尼龙头螺丝及其加工方法

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US4674312A (en) * 1985-01-18 1987-06-23 Westinghouse Electric Corp. Pilgering apparatus
GB2265911B (en) * 1992-04-02 1995-04-05 Inlex Locking Ltd Method of heat treating a zone of each of a plurality of articles
US7740436B2 (en) * 2006-03-22 2010-06-22 R B & W Manufacturing Llc Clinch nut
FI125577B (en) * 2006-06-22 2015-11-30 Wärtsilä Finland Oy A method for handling a crankshaft
US7914244B2 (en) * 2007-10-03 2011-03-29 Illinois Tool Works Inc. Fastener with zoned, varying wave-form thread
CN103723486A (zh) * 2013-11-14 2014-04-16 苏州昌飞自动化设备厂 一种电子元件的双侧边脚焊接机的边脚自动进料机构
DE102018103325A1 (de) * 2018-02-14 2019-08-14 Ejot Gmbh & Co. Kg Gewindefurchende Schraube und Herstellung derselben
CN108927475B (zh) * 2018-09-06 2019-09-03 杭州浩合螺栓有限公司 一种螺栓加工系统
CN112244651B (zh) * 2020-10-16 2025-08-01 惠州拓邦电气技术有限公司 一种投料装置及炒菜机器人
CN113060536B (zh) * 2021-02-07 2022-12-02 机械工业第九设计研究院股份有限公司 一种可升降滑橇定位销机构
CN118143178B (zh) * 2024-03-25 2024-12-03 徐州博莱康精密机械有限公司 一种五金紧固件加工用热镦成型设备

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US1953445A (en) * 1932-04-25 1934-04-03 Hodgson S Pierce Method of heat treating articles
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Cited By (20)

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US4021274A (en) * 1975-03-26 1977-05-03 Russell, Birdsall & Ward, Inc. Method for heat treating by induced current
US6086305A (en) * 1999-01-13 2000-07-11 Illinois Tool Works Inc. Nails having selected heat treatment and hardening
EP1022346A1 (en) * 1999-01-13 2000-07-26 Illinois Tool Works Inc. Nails having selected heat treatment and hardening
US6109851A (en) * 1999-01-13 2000-08-29 Illinois Tool Works Inc. Screws having selected heat treatment and hardening
US6273974B1 (en) 1999-01-13 2001-08-14 Illinois Tool Works Inc. Selected heat treatment and hardening method for nails
US6364972B1 (en) 1999-01-13 2002-04-02 Illinois Tool Works Inc. Method for selectively hardening a carbon steel screw
US6436474B2 (en) 1999-01-13 2002-08-20 Illinois Tool Works Inc. Method of chemically coating fasteners having improved penetration and withdrawal resistance
US6758921B1 (en) * 1999-09-02 2004-07-06 Benteler Ag Method of manufacturing a bending-resistant, torsionally yielding tubular profiled member as a transverse support for a twist beam rear axle of a passenger car
LU90537B1 (de) * 2000-03-02 2001-09-04 Trefil Arbed Bissen S A Nagel
WO2001065125A1 (de) * 2000-03-02 2001-09-07 Trefilarbed Bissen S.A. Nagel
US20040235576A1 (en) * 2003-04-08 2004-11-25 Ejot Gmbh & Co Kg Screw with a partially hardened functional tip and process for the production thereof
US7247099B2 (en) 2003-04-08 2007-07-24 Ejot Gmbh & Co. Kg Screw with a partially hardened functional tip and process for the production thereof
US20070243043A1 (en) * 2006-04-17 2007-10-18 Acument Intellectual Properties, Llc High performance thread forming screw
US20090286608A1 (en) * 2006-04-17 2009-11-19 Price David R Method of forming a high performance thread forming screw
US8172692B2 (en) 2006-04-17 2012-05-08 Acument Intellectual Properties, Llc Method of forming a high performance thread forming screw
US20120223518A1 (en) * 2009-11-06 2012-09-06 Yazaki Kako Corporation Thin joint member producing method and pair of thin joint members
US9303668B2 (en) * 2009-11-06 2016-04-05 Kabushiki Kaisha Yoshino Kosakujo Thin joint member producing method and pair of thin joint members
US10662993B2 (en) * 2017-02-01 2020-05-26 Kamax Holding Gmbh & Co. Kg High-strength screw including an unhardened thread end
CN112680584A (zh) * 2020-11-27 2021-04-20 上海宏挺紧固件制造有限公司 一种尼龙头螺丝及其加工方法
CN112680584B (zh) * 2020-11-27 2022-08-16 上海宏挺紧固件制造有限公司 一种尼龙头螺丝及其加工方法

Also Published As

Publication number Publication date
FR2130676A1 (enrdf_load_stackoverflow) 1972-11-03
DK131384C (enrdf_load_stackoverflow) 1975-12-01
DE2211608A1 (de) 1972-10-05
JPS5525289B1 (enrdf_load_stackoverflow) 1980-07-04
IT952337B (it) 1973-07-20
SE391194B (sv) 1977-02-07
DE2211608B2 (de) 1976-09-30
DK131384B (da) 1975-07-07
BE780527A (fr) 1972-07-03
AU4037872A (en) 1973-09-27
US4112812A (en) 1978-09-12
CA950808A (en) 1974-07-09
SE7410621L (enrdf_load_stackoverflow) 1974-08-21
FR2130676B1 (enrdf_load_stackoverflow) 1977-01-14
GB1376025A (en) 1974-12-04
GB1376026A (en) 1974-12-04
AU471188B2 (en) 1973-09-27
SE395718B (sv) 1977-08-22

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