US2645793A - Nut piercing method - Google Patents

Nut piercing method Download PDF

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Publication number
US2645793A
US2645793A US9977049A US2645793A US 2645793 A US2645793 A US 2645793A US 9977049 A US9977049 A US 9977049A US 2645793 A US2645793 A US 2645793A
Authority
US
United States
Prior art keywords
blank
punch
slug
die
side wall
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
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English (en)
Inventor
John H Friedman
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.)
National Machinery Co
Original Assignee
National Machinery 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
Application filed by National Machinery Co filed Critical National Machinery Co
Priority to US9977049 priority Critical patent/US2645793A/en
Priority to FR1021847D priority patent/FR1021847A/fr
Priority to GB1397750A priority patent/GB679946A/en
Priority to CH317978D priority patent/CH317978A/fr
Priority to DEN1082A priority patent/DE917044C/de
Application granted granted Critical
Publication of US2645793A publication Critical patent/US2645793A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/32—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds
    • B60G11/34—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs
    • B60G11/36—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs and also helical, spiral or coil springs
    • 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
    • B21K1/64—Making machine elements nuts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements
    • H04J1/045—Filters applied to frequency transposition
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2209—Guide
    • Y10T83/2213—Product-diverting conduit in or from hollow tool

Definitions

  • This invention relates tormethodsV for piercing blanks and is particularly adapted for use in connection with a cold header.
  • This invention is particularly advantageous Where the diameter of the v'punched hole is relatively large with regard to the diameter of the' K blank, in which case difficulty has been encountered due to expansion and permanent set ofthe blank as a result of a socketing or punching operation. It is an object of the invention to pierce blanks, such as nut blanks, while cold, without expanding the blanks and With'a minimum of tool wear and breakage.
  • this is accomplished by confining the blank side wall in a sliding die, bringing a punch or tool against the blank, socketing the blank or piercing the blank while conned and vuntil ⁇ a slug has broken loose, and if punching, continuing the' punching motion to force the slug clear of the ⁇ blank while simultaneously removing 'the confinement of the blank side wall.
  • the slugf'severing operation takes place While the blank is confined; although the blank may have thin side Walls, it will not be stretched or expanded beyond its elastic limit.
  • the punch is withdrawn from the blank after the latter hasbeen Acarried clear of the die by the punch, so that the blank is unconned during the stripping operation.
  • this is accomplished by stripping mechanism carried vbythe header slide which may be positioned independently of the punch.
  • the punch is stripped rfrom the blank after the latter has been withdrawn clear of the die, which produces little or no wear on the punch.
  • the blank can spring slightly during stripping which facilitates Withdrawal of the punch, but this expansion is not enough to cause a stress that exceeds the'elastic limit, so'that the blank returns to its original diameter.
  • Another object of the invention is to pcsitivel y and firmly break the'punched slug clear of the nose of the punch after the punch has expelled or pushed the slug into the slug discharge tube.
  • the initial pressure necessary to sever 'the slug from the'blank is often high enoughto cause the slug to adhere firmly to'the punch nose so that the slug tends to be withdrawn with the punch to remain in the blank, instead of being' deposited in the discharge tube provided for the slugs.
  • blank transfer fingers ⁇ r may be at punching operationi- I n the preferred arrange-A ment, theseobjects are attained byy providing one lowing detailed Adescription of a or'more prongsor extensions ⁇ n'iovablewit'h the header slide rthat 'stra'ddle or clear the transfer fingers and protrude axially forwardly.- These extensions engage the sliding die or sleeve that surrounds the blank' after the 'slug has been severed from tliefblank by .the'punch land force the dieclear'ofthefblank y l The .mannerinwhich these and 'other lobjects are accomplished will be apparent from the 'folpreferred embodimentof the'l invention. f
  • FIG. 1 is a simplified Asection'of a ⁇ cold heading device suitable for carrying kout the invention
  • FIG. 2' is a fragmentary elevation showing the tool assembly and a 'portion of the transfer fin-v gers;
  • Fig. 3 is a ⁇ section through the tool and'A die assembly of vthe apparatus disposed yjust as the punching operation f-b ⁇ egins; z
  • Fig. 4 is a section showing the apparatus just as the slug is severed from the blank
  • Fig. 5 shows the vslug broken loose from the end of the punch
  • Fig. 6 shows the header-slide 'retracted andthe punch partially'stripped from the blank.
  • the invention is not limited to cold-headers, it is particularly adaptabeleto cold heading machines such as that shown'in the patent to Clouse, 1,856,027,.Apri1 26, 1932, and is also applicable to a nut machine such as disclosed in my pending application, Serial No.
  • Cold headers adaptable to effecting the invention include generally a die block, arec-iprocable header slide and tools, means to feed stock to the die block, means to shear kolf vblanksV'means totransfer the blanks consistently and ypositively prevented by dispos- I kbetween stations in the die block, means to advance andretract the Aheader slide to perform work on the blanks, and means to knock out the blanksfrom the dies into the transfer means.
  • the .header frame Il) ⁇ has guides II for reciprocably mounting a slide S.
  • Slide S is reciprocated by the usual crankshaft I2 rotatable in the machine frame which drives the crank or pitman I3 pivoted to the header slide as at I4.
  • a cam C is mounted on the crankshaft to control the operation of means to strip the punch from the blank.
  • a roller IB is mounted on a cam follower I1 which is pivoted tothe frame as at I8 and urged by spring apparatus I9 so that the roller bears against the cam.
  • the follower controls a plunger 2
  • the combined punching and stripping mechanism 22 is mounted in the header slide, the actual construction thereof being somewhat simplified in Fig.
  • Suitable transfer mechanism such as that disclosed in my application Serial No. 663,569, filed April 19, 1946, now Patent No. 2,542,864 granted February 20, 1951, operate transfer fingers T to transfer blanks from station to station.
  • a die block 26 and a punch or die station D are also provided which will be described hereinafter in more detail.
  • Figs. 2 and 3 Preferred constructional details of the tool and die assemblies are illustrated in Figs. 2 and 3.
  • the header slide S has screwed therein a sleeve 3l which acts as a retainer for a bushing 32 having forwardly projecting fingers 33 arranged to pass between the transfer fingers T.
  • the stripping sleeve 24 surrounds the punch P and slides within the bushing V32.
  • the punch P is retained in the slide by an inner sleeve 34 and a head 35 on the punch shank, these elements being forced against the bushing 32 by means of a plug 36 and a clamping wedge 23 in accordance with practice well known in the art.
  • the plunger 25 has forwardly extending pins 31 which extend through the apertures in the inner sleeve 34 and engage the rearward portion l38 of the stripping sleeve 24.
  • the die block 25 incorporates special die or punch station mechanism D.
  • a hardened sleeve member 4I is fastened in the die block and slidably mounts a two-part confining sleeve or die member made up of an outer member 42 and an inner hardened blank-confining sleeve or die 43.
  • a discharge tube 5I is mounted centrally in the die station, and includes a slug-receiving passageway 53, a tapered shoulder 54 for breaking the slug clear from the punch, and a slug-receiving mouth 52 concentric with the punch.
  • a blank is transferred by the transfer fingers T and their controlling mechanism to a position in front of the sliding die member 43.
  • the nose of punch P engages the blank O and forces it into sleeve member 43, springs 41 holding the sleeve member in its outermost position during this operation.
  • cam C is contoured so that surface 3
  • the position of the parts in Fig. 3 is such that the punch P has entube.
  • the stripping operation occurs when the blank has cleared the transfer lingers and while it is unconflned so that no permanent expansion may occur, and wear on the tool is greatly reduced.
  • the surface 34 of the cam is turned under the follower which permits the entire slide, including the stripping assembly to retract with the header slide.
  • any means having a similar mode of operation may be employed to effect independent motion of the punch and stripping sleeve.
  • thinwalled blanks can be pierced or punched without danger of permanent expansion of the blanks.
  • retraction of the tool is effected while the blanks are unconfined so that tool life is greatly prolonged.
  • the tool is stripped from the blank with the blank well clear of the die and transfer fingers so that no interference will be encountered.
  • the apparatus disclosed herein is claimed in clined surface thereby tilting the slug away from the end of the punch while the blank is cold and while it is coni-"ined, removing the confinement of the blank side wall, and withdrawing the punch j from the blank while the side wall thereof is unconiined.
  • a method of piercing blanks 4 comprising the steps of confining the side wall of a. blank s0 that it cannot radially expand, axially punching and severing a slug from the blank while cold and while it is coniined by moving apunch into Vthe blank for less than the full length of the blank and then tilting the slug and, continuing to ad- Vance the punch while simultaneously removing the conusement of the blank side wall behind the punch, and withdrawing the punch from the blank While the side wall thereof is unconiined,
  • a method of piercing blanks comprising the' steps of conning the side wall of a blank so that it cannot radially expand, axially punching and severing a slug from the blank While cold and while it is coniinedby moving a punch into the blank for less than the full length of the blank and then tilting the slug and, continuing to advance the punch entirely through the blank while simultaneously removing the confinement of the the punch while simultaneously Lremoving 'the confinement of the ,blank sidewall behind the punch axially'in the direction of punch movement, and withdrawing the punchfromthe blank while the side wall thereof is unconfined.
  • a method of piercing blanks comprising the steps of confining the side wall of a blank so that it cannot radially expand, axially advancing a punch into said blank to severa slugfrom'the blank while it is co'nned, simultaneously removing the confinement of vthe blank side wall behind the head of the punch duringsaid advancing of said punch, continuing to advance the i punch entirely through the blank, withdrawing the punch with the blank thereon, and stripping the punch from the blank while 'the v side wall thereof is unconiined.v
  • a method of piercing blanks comprising the steps of confining the side Wall of 'a blank so that it cannot radially expand, axially advancing a punch into said blank to severa slug from the y blank while it is confined, simultaneously removing the confinement of the blank side wall behind the head of the punch during said advancing of said punch, continuing toadvance the i punch entirely through the blank, breaking theipunched slug loose from the punch while the punch is disposed in the punched hole of the blank, withdrawing the punch with the blank thereon, and stripping the punch from the blank while the side Wall thereof is unconiined.
  • a method of piercing blanks comprising the steps of confining the side wall of a blank so that fit cannot radially expand, axially advancingsa blank side wall behind the punch, withdrawing the punch with the blank thereon from the die, and stripping the punch from the blank while the side Wall thereof is unconfned.
  • a method of piercing blanks comprising the steps of confining the side wall of a blank so that it cannot radially expand, axially punching and severing a slug from the blank while cold and while it is confined, continuing toadvance the punch entirely through the blank while simultaneously removing the conusement of the blank side wall behind the punch, tilting the punched slug loose from the punch with the punch disposed in the punched hole of theblank, withdrawing the punch with theblank thereon from the die, and stripping the punch from'the blank while the side vwall thereof is unconned.
  • a method of piercing blanks comprising the steps of axially punching the blank with a tool to sever a slug from the blank while cold, forcing the slug partially through the blankinto engagen ment with an inclined surface with the tool thereby radially camming the free end of the slug to break it clear of the nose of the tool.
  • a method of piercing blanks comprising the steps of axially punching the blank with a tool to sever a slug from the blank while cold, forcing the slug partially through the blank with the tool into engagement with an inclined surface thereby tilting the slug clear of the nose of the tool, and withdrawing the tool within the blank thereon afterV the slug is broken clear.
  • a method of piercing blanks comprising the steps of conningthe side wall of a blank so that it cannot radially expand, axially punching and severing a slug from the blank while cold and while it is confined, continuing to advance punch into said blank while it is coniined, simultaneously removing the .confinement of the blank sidewall behind the head ofthe punchduring said advancing of said punch, continuing Vto re- 7 move the confinement of the blank sidewall, withdrawing the punch with the blank thereon, and stripping the punchfrom the blank 'while the side wall thereof is unconned.
  • a method of piercing a blank comprising the'steps of confining the side wall of a blank in a die opening, forcing a punch into said blank by relative axial movement of the punch and blank in one direction while the sidewall of the blank is coniined,'simultaneously removing the confinement ofthe blank side wall behindk the head of the punch during said advancing of said f punch by axial motion of said die relative to said blank in the same direction as the axial motion of said punch relative to said blank continuing the relative axial movement of said blank and said die to free the side wall of the pierced blank from said die, and stripping the punch'from the blank while the side wallof the blank is vunconnned by axial motion of the punch relative to said blank in the opposite direction rfrom said JOHN H.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Forging (AREA)
US9977049 1949-06-17 1949-06-17 Nut piercing method Expired - Lifetime US2645793A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US9977049 US2645793A (en) 1949-06-17 1949-06-17 Nut piercing method
FR1021847D FR1021847A (fr) 1949-06-17 1950-06-01 Perfectionnements apportés aux procédés et dispositifs pour percer ou perforer des ébauches
GB1397750A GB679946A (en) 1949-06-17 1950-06-05 Improvements in or relating to method of and apparatus for piercing metal blanks
CH317978D CH317978A (fr) 1949-06-17 1950-06-13 Procédé pour la perforation d'ébauches et machine pour la mise en oeuvre de ce procédé
DEN1082A DE917044C (de) 1949-06-17 1950-06-17 Verfahren und Vorrichtung zum Durchlochen von vorgeschmiedeten Werkstuecken, z.B. Muttern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9977049 US2645793A (en) 1949-06-17 1949-06-17 Nut piercing method

Publications (1)

Publication Number Publication Date
US2645793A true US2645793A (en) 1953-07-21

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ID=22276534

Family Applications (1)

Application Number Title Priority Date Filing Date
US9977049 Expired - Lifetime US2645793A (en) 1949-06-17 1949-06-17 Nut piercing method

Country Status (5)

Country Link
US (1) US2645793A (de)
CH (1) CH317978A (de)
DE (1) DE917044C (de)
FR (1) FR1021847A (de)
GB (1) GB679946A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358538A (en) * 1966-01-13 1967-12-19 Warner Swasey Co Punch die having means to prevent return of slugs

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2949051A (en) * 1957-04-12 1960-08-16 Lake Erie Machinery Corp Cold extrusion press
DE102010008654A1 (de) * 2010-02-20 2011-08-25 Bayerische Motoren Werke Aktiengesellschaft, 80809 Verfahren zur Herstellung eines gesinterten oder geschmiedeten Bauteils

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US490773A (en) * 1893-01-31 Charles osborne
US834372A (en) * 1906-05-07 1906-10-30 George Dunham Method of making hexagonal nuts.
US1100891A (en) * 1913-07-03 1914-06-23 John R Kreiser Nut-making machine.
US1795518A (en) * 1926-04-21 1931-03-10 William E Sharp Apparatus for producing bolt nuts
US1977163A (en) * 1933-07-22 1934-10-16 Waterbury Farrel Foundry Co Die mechanism
US2287214A (en) * 1941-11-10 1942-06-23 Waterbury Farrel Foundry Co Means for making articles having a polygonal cross section or the like
US2380584A (en) * 1944-03-22 1945-07-31 Towne Robinson Nut Company Nut retainer die and ejector
US2419862A (en) * 1944-04-29 1947-04-29 George F Wales Method of and apparatus for punching by transfer means

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE469900C (de) * 1926-01-14 1928-12-28 Alfred De Fries Auswerfvorrichtung in Warmmutternpressen
DE588462C (de) * 1930-11-27 1933-12-09 Fritz Hatebur Maschine zur Herstellung von Schraubenmuttern auf warmem Wege

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US490773A (en) * 1893-01-31 Charles osborne
US834372A (en) * 1906-05-07 1906-10-30 George Dunham Method of making hexagonal nuts.
US1100891A (en) * 1913-07-03 1914-06-23 John R Kreiser Nut-making machine.
US1795518A (en) * 1926-04-21 1931-03-10 William E Sharp Apparatus for producing bolt nuts
US1977163A (en) * 1933-07-22 1934-10-16 Waterbury Farrel Foundry Co Die mechanism
US2287214A (en) * 1941-11-10 1942-06-23 Waterbury Farrel Foundry Co Means for making articles having a polygonal cross section or the like
US2380584A (en) * 1944-03-22 1945-07-31 Towne Robinson Nut Company Nut retainer die and ejector
US2419862A (en) * 1944-04-29 1947-04-29 George F Wales Method of and apparatus for punching by transfer means

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358538A (en) * 1966-01-13 1967-12-19 Warner Swasey Co Punch die having means to prevent return of slugs

Also Published As

Publication number Publication date
GB679946A (en) 1952-09-24
FR1021847A (fr) 1953-02-24
DE917044C (de) 1954-11-29
CH317978A (fr) 1956-12-15

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