US2066372A - Method of making dies or punches - Google Patents

Method of making dies or punches Download PDF

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Publication number
US2066372A
US2066372A US43399A US4339935A US2066372A US 2066372 A US2066372 A US 2066372A US 43399 A US43399 A US 43399A US 4339935 A US4339935 A US 4339935A US 2066372 A US2066372 A US 2066372A
Authority
US
United States
Prior art keywords
punch
nub
shoulder
matrix
wings
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.)
Expired - Lifetime
Application number
US43399A
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English (en)
Inventor
Joseph J Tomalis
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.)
AMERICAN SCREW CO
Original Assignee
AMERICAN SCREW CO
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 BE417609D priority Critical patent/BE417609A/xx
Application filed by AMERICAN SCREW CO filed Critical AMERICAN SCREW CO
Priority to US43399A priority patent/US2066372A/en
Priority to GB25733/36A priority patent/GB465712A/en
Application granted granted Critical
Publication of US2066372A publication Critical patent/US2066372A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B21K1/463—Making machine elements bolts, studs, or the like with heads with recessed heads
    • 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
    • B21K5/00—Making tools or tool parts, e.g. pliers
    • B21K5/20—Making working faces of dies, either recessed or outstanding

Definitions

  • This invention relates to punches and to the method of making the same, and more particularly to punches of the type used in forming recesses in the heads of screws.
  • An important feature of the invention resides in the construction of. a punch comprising a projection or nub extending integrally from a shoulder on the end of a metal bar, wherein the metal of the punch is compressed and upset as a. result of cold pressing into a matrix and wherein simultaneously a fillet is formed at the junction of all of the surfaces of the projection and the said shoulder.
  • Another important feature of the invention resides in the method of forming a punch by first roughing it out by conventional tool-room methods using rotating tools and then forcing the punch projection cold into a matrix which changes the-heretofore machined surfaces and I the shape of the projection, compresses the metal and forms a fillet of short radius at the junctionr of the machined surfaces and the shoulder on the bar from which the punch projection is formed.
  • a further important feature of the invention resides in the forming of the punch proper first with arcuate surfaces and then reducing these surfaces to true planes in a cold forming operation using a matrix.
  • Figure 1 represents a bar or rod of metal prior Figure 2 shows the same rod afterturning in a lathe to form the punch nub thereon;
  • Figure 3 illustrates the operation of end milling the grooves
  • Figure 4 is an end view of theincompletely formed punch resulting from the operation of Figure 5 and the following figures are all on an enlarged scale and Figure 5 shows the incompletely formed punch about to'be driven into the matrix which is illustrated in verticaii central section;
  • Figure 6 is a 'plan view of the matrix
  • Figure 7 is a side elevation of the completed punch; and j Figure 8 is an end view thereof.
  • the form of recess now manufactured in such screws may be considered substantially like that from a central opening.
  • the wing slots taper 20 in length from a maximum at the head of the screw to substantially the size of the opening at I the bottom of the recess but remain substantially uniform in width at their edges, thickening however on' merging with the center.
  • the walls of 25 the wing slots and the walls of the connecting surface comprise a series-of flat or plane surfaces, rather than arcuate ones, and it has been demonstrated that these are highly desirable and in fact essential in holding the screw driver in the slot when considerable resistance to the entrance of the screw is exerted.
  • Recesses of the type just described are formed in the crudely up-set screw heads at a certain stage in their process of manufacture by holding the screw in a suitable anvil and forcing a properly shaped punch to the desired depth into the metal of the head whfle it is cold.
  • This operation is an extremely severe one both on the metal of the screw and on the metal of the punch.
  • the 40 punch must be formed to the reverse of the recess in the screw, and because of the severeness of the operation and the small size the punches are consumed rapidly. They must be exact in size and shape so that the fit of the recess on the screw driver is such that the screw can be held in place on the end of the driver for insertion into difficult places. This means that no substantial variation in the size of the recess, and hence the punch, is permitted.
  • th conventional tool-room practices are first to form a developed punch shapewhich is mine ⁇ - quently and by an additional operation changed to the exact desired final form while also being improved in strengthand texture of the metal.
  • a suitable metal stock is used from which to form the punches, preferably tool steel cut into short lengths of rod Ill such as shown in Figure 1. It is preferably circular and of a convenientdiameter'to be .held in the punching machine head.
  • the tool By turning in a lathe there is provided a the tool is presented along an axis at a slight. angleto thevertical axis of the rod and the nub.
  • the axis of the tool lies betweemthe axis of the j rod and theinclinedsurfaceof the nub. wltha the proper displacement from theflcenter of the "nub, this end mill is moved axially to out each inclined groove 15 substantially to the depth of the shoulder H.
  • the rod is indexed through90 semi-finished punch shown in Figures 3 and 4, all surfacesof which are curved and those of ,jlthe-groovej- Iiiibeing arcuate.
  • the surfaces It 1140* i curved in vertical section in accordance with the predeterminedshape of-the wings. Because of the; angle atfwhich the milling cutter is advanced,
  • the amount .of metal in the crudely'finished nub of the punch lis slightlygreater would be I normally accepted in thelf c fiof-the causing aflsinallamount of compressionan'dfup set of the metalasw'ell as achange of-its shape i as the is forced into thematrix. Any accidental considerable excess; of the metal will be forced downinto the-opening 18.
  • Thecurvature of the junction of the surfaces of the punch and its shoulder may be likened to fillets strengthening the punch at the .point of app ication of the stresses thereon where they are transferred to .the larger section of the rod.
  • the method of forming a punch for making screw head recesses of cruciform plan comprising turning the end of a bar of metal to provide a flat shoulder with a nub projecting therefrom having in longitudinal section substantially the form of a similar section through the wings of a finished punch, grooving the sides of the nub substantially longitudinally with a rotary tool to form alternate grooves, extending to said shoulder, and wings, reshaping said grooves and wings and forming a rounded fillet at the junction of each nub surface with the said shoulder solely by pressure on said surfaces.
  • the method of forming a punch for making screw head recesses of cruciform plan comprising turning the end of a bar of tool steel to provide a shoulder and a tapering nub projecting therefrom, grooving the sides of the nub at a slight inclination to the nub axis with an end mill to form alternate grooves and wings each extending to the shoulder, forcing the nub cold into a matrix to change the shape of all surfaces formed by the mill and to compress the metal of the nub and thereafter hardening the nub.
  • the method of forming a punch for making screw head recesses of cruciform plan comprising turning thejend of a bar of steel to provide asubstantially flat shoulder with a tapering nub projecting therefrom, grooving the nub with an end mill rotating on an axis extending between the nub axis and nub surface to thus form alternate grooves and wings each extending to the shoulder, forcing the nub into a matrix to change all arcuate surfaces formed by the mill to flat surfaces and simultaneously forming a rounded fillet at the junction of each changed surface and the said shoulder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US43399A 1935-10-03 1935-10-03 Method of making dies or punches Expired - Lifetime US2066372A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE417609D BE417609A (en(2012)) 1935-10-03
US43399A US2066372A (en) 1935-10-03 1935-10-03 Method of making dies or punches
GB25733/36A GB465712A (en) 1935-10-03 1936-09-22 Punches and method of making the same

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US465712XA 1935-10-03 1935-10-03
US811218XA 1935-10-03 1935-10-03
US43399A US2066372A (en) 1935-10-03 1935-10-03 Method of making dies or punches

Publications (1)

Publication Number Publication Date
US2066372A true US2066372A (en) 1937-01-05

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ID=27366324

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US43399A Expired - Lifetime US2066372A (en) 1935-10-03 1935-10-03 Method of making dies or punches

Country Status (3)

Country Link
US (1) US2066372A (en(2012))
BE (1) BE417609A (en(2012))
GB (1) GB465712A (en(2012))

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455538A (en) * 1945-01-08 1948-12-07 J F Helmold & Bro Inc Method of making cutting tools
US2537029A (en) * 1946-08-06 1951-01-09 Phillips Screw Co Method for manufacturing screw drivers
US2565948A (en) * 1946-08-06 1951-08-28 Phillips Screw Co Method of manufacturing screw drivers
US2627192A (en) * 1950-09-25 1953-02-03 Res Eng & Mfg Process of making driver bits
US2638019A (en) * 1950-06-08 1953-05-12 Domnic V Stellin Method of making a vaned member
US2673359A (en) * 1951-01-11 1954-03-30 Domnic V Stellin Tool for forming recesses and sockets of high torque strength
US2699693A (en) * 1953-05-11 1955-01-18 American Screw Co Matrix and method of making same
US2755689A (en) * 1951-07-19 1956-07-24 Paul P Sundback Method of hobbing steels
US2797595A (en) * 1954-04-02 1957-07-02 American Screw Co Method of hobbing recess-forming punches
US2822708A (en) * 1954-03-16 1958-02-11 Kropp Forge Company Method of making a forging die
US2826940A (en) * 1954-01-20 1958-03-18 American Screw Co Method of piercing type for hobbing punches
US2854867A (en) * 1953-04-29 1958-10-07 American Screw Co Method of making header dies
US2906197A (en) * 1955-08-16 1959-09-29 Meyer & Wenthe Inc Seal press support and die and method for forming the latter
US3055567A (en) * 1957-10-22 1962-09-25 Frank M Sayford Company Blank forming apparatus and method
US3060565A (en) * 1959-01-09 1962-10-30 Rudolph M Vaughn Method of making improved screw driver
US3124975A (en) * 1964-03-17 Methods of making combination recess-forming
US3290918A (en) * 1963-12-06 1966-12-13 Anthony V Weasler Method of manufacturing a shaft coupling
US3517587A (en) * 1950-08-28 1970-06-30 Us Army Method of producing a fluted cone mandrel
US3768343A (en) * 1972-06-14 1973-10-30 Du Pont Method for producing a punch
US3793911A (en) * 1972-10-02 1974-02-26 Western Electric Co Extrusion die and method for making the same
US4068518A (en) * 1975-05-20 1978-01-17 Lucas Industries Limited Method of manufacturing an extruded steel component
US4241598A (en) * 1978-10-16 1980-12-30 Sack & Kiesselbach Maschinenfabrik Gmbh Method for producing a cross-slotted heading die
US4594876A (en) * 1981-10-26 1986-06-17 Union Special Corporation Apparatus for forming the stitch forming area of a sewing machine throat plate
WO2003025403A3 (en) * 2001-09-17 2003-10-30 Uniscrew Ltd Screw head formation
US20070065253A1 (en) * 2005-08-17 2007-03-22 Uni-Screw Worldwide, Inc. Fasteners with multi-tiered recesses and drivers with multi-tiered driving tips
CN102626847A (zh) * 2012-04-06 2012-08-08 常熟市建华模具有限责任公司 玻璃模具用的冲头的加工方法

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124975A (en) * 1964-03-17 Methods of making combination recess-forming
US2455538A (en) * 1945-01-08 1948-12-07 J F Helmold & Bro Inc Method of making cutting tools
US2537029A (en) * 1946-08-06 1951-01-09 Phillips Screw Co Method for manufacturing screw drivers
US2565948A (en) * 1946-08-06 1951-08-28 Phillips Screw Co Method of manufacturing screw drivers
US2638019A (en) * 1950-06-08 1953-05-12 Domnic V Stellin Method of making a vaned member
US3517587A (en) * 1950-08-28 1970-06-30 Us Army Method of producing a fluted cone mandrel
US2627192A (en) * 1950-09-25 1953-02-03 Res Eng & Mfg Process of making driver bits
US2673359A (en) * 1951-01-11 1954-03-30 Domnic V Stellin Tool for forming recesses and sockets of high torque strength
US2755689A (en) * 1951-07-19 1956-07-24 Paul P Sundback Method of hobbing steels
US2854867A (en) * 1953-04-29 1958-10-07 American Screw Co Method of making header dies
US2699693A (en) * 1953-05-11 1955-01-18 American Screw Co Matrix and method of making same
US2826940A (en) * 1954-01-20 1958-03-18 American Screw Co Method of piercing type for hobbing punches
US2822708A (en) * 1954-03-16 1958-02-11 Kropp Forge Company Method of making a forging die
US2797595A (en) * 1954-04-02 1957-07-02 American Screw Co Method of hobbing recess-forming punches
US2906197A (en) * 1955-08-16 1959-09-29 Meyer & Wenthe Inc Seal press support and die and method for forming the latter
US3055567A (en) * 1957-10-22 1962-09-25 Frank M Sayford Company Blank forming apparatus and method
US3060565A (en) * 1959-01-09 1962-10-30 Rudolph M Vaughn Method of making improved screw driver
US3290918A (en) * 1963-12-06 1966-12-13 Anthony V Weasler Method of manufacturing a shaft coupling
US3768343A (en) * 1972-06-14 1973-10-30 Du Pont Method for producing a punch
US3793911A (en) * 1972-10-02 1974-02-26 Western Electric Co Extrusion die and method for making the same
US4068518A (en) * 1975-05-20 1978-01-17 Lucas Industries Limited Method of manufacturing an extruded steel component
US4241598A (en) * 1978-10-16 1980-12-30 Sack & Kiesselbach Maschinenfabrik Gmbh Method for producing a cross-slotted heading die
US4594876A (en) * 1981-10-26 1986-06-17 Union Special Corporation Apparatus for forming the stitch forming area of a sewing machine throat plate
WO2003025403A3 (en) * 2001-09-17 2003-10-30 Uniscrew Ltd Screw head formation
US20070065253A1 (en) * 2005-08-17 2007-03-22 Uni-Screw Worldwide, Inc. Fasteners with multi-tiered recesses and drivers with multi-tiered driving tips
CN102626847A (zh) * 2012-04-06 2012-08-08 常熟市建华模具有限责任公司 玻璃模具用的冲头的加工方法

Also Published As

Publication number Publication date
BE417609A (en(2012))
GB465712A (en) 1937-05-13

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