US3768343A - Method for producing a punch - Google Patents

Method for producing a punch Download PDF

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Publication number
US3768343A
US3768343A US00262493A US3768343DA US3768343A US 3768343 A US3768343 A US 3768343A US 00262493 A US00262493 A US 00262493A US 3768343D A US3768343D A US 3768343DA US 3768343 A US3768343 A US 3768343A
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US
United States
Prior art keywords
punch
stock
slots
segments
producing
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
US00262493A
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English (en)
Inventor
C Hawkins
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Application granted granted Critical
Publication of US3768343A publication Critical patent/US3768343A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/16—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass plates with holes of very small diameter, e.g. for spinning or burner nozzles

Definitions

  • ABSTRACT A method for producing a punch for single-step forming a spinneret nozzle having a plurality of slot-like segments includes breaching an appropriately sized hole drilled into one end of soft punch stock to form the inside dimensions of the segments, then machining the punch stock to the outside dimensions of the segments and slotting and removing a portion of the punch at its tip end to form a plurality of male arcuate die segments. The tool is then heat treated.
  • spinneret capillaries used to form hollow filaments by polymer coalescence below the face of the spinneret require a complex nozzle.
  • These nozzles are made up of a plurality of short, shaped slots or orifices separated by webs of metal to provide points where air can enter the filaments and to provide support for the internal portion of the orifice.
  • the slots are shaped so as to provide more polymer at the ends of the slots.
  • a method for producing a die punch tool from soft punch stock for forming a complex spinneret nozzle having a plurality of slots each of said slots having inner and outer configurations comprising: machining a hole axially into one end of said soft punch stock; broaching said hole to conform to the inner configuration of said slots in said hole; machining the outer portion of said stock to conform to the outer configuration of said slots; removing punch stock material to form male die segments; and hardening the stock.
  • FIGS. 1 and 1a are partial elevation and end views, respectively, of a broach which may be used in producing a punch tool.
  • FIGS. 2 and 2a are partial top and elevation views, respectively, of a section of punch stock drilled to accept the broach of FIG. 1.
  • FIGS. 3 and 3a are top and elevation views similar to FIGS. 2 and 2a after broaching.
  • FIGS. 4 and 4a represent partial end and elevation views of the punch stock of FIGS. 2 and 3 after the machining is complete.
  • FIGS. 5 and 6 illustrate orifice configurations that can be made with a punch made according to the in vention.
  • a forming tool or broach 10 having a round stem 12 extending from tapered shoulder 14 has grooves 16 milled into stem 12.
  • This broach 10 is used to form the inner configuration of the punch tool in punch stock 20 which is axially drilled with holes 22, 24.
  • the hole 22 is the same diameter as the stem 12 of broach 10 and serves as a starter or guide hole.
  • the diameter of hole 24 is the same as the smallest distance between two opposed grooves 16 in broach 10, e.g., dimension s in FIG. 1a.
  • the forming tool is forced down into the drilled punch stock to a depth such as that shown by arrow B in FIG. 3a to produce a shaped internal surface having four protrusions 26.
  • the thusly shaped punch stock is then machined to provide a punch 30 having a tapered shoulder 32 and round stem 34, the outer surface of stem 34 will determine the outer configuration of spinning nozzle slots punched in a spinneret.
  • Slits 36 are then cut into the terminal portion of the stem 34. The center of the slits corresponds to the longitudinal axis of the grooves.
  • the tip end of the stem 34 is then removed at least as far back as the bottom of the starter hole 22 to form the punch which is then heat treated and polished.
  • the finished punch 30 terminates in four arcuate male die segments 38 having tapered inwardly extending enlargements 40.
  • the forming tool or broach 10 will ordinarily have the round stem 12 as shown but may be machined to other shapes.
  • the grooves 16 machined into the broach will determine, at least in part, the shape of the enlargements 40 of the arcuate die segments 38 of the punch.
  • the grooves 16 may be of any suitable cross-sectional configuration but preferably will be rounded rather than angular.
  • the shape of the forming tool will determine the shape of the inner configuration of the stock hole 24. This shape in turn determines the inner configuration of spinning nozzle slots punched in a spinneret.
  • the innermost part of the enlargements can be an are formed from the wall of the drilled hole 24.
  • FIG. 5 illustrates one of a plurality of spinning nozzles 50 usually provided in a spinneret plate as formed by a punch tool similar to that illustrated in FIGS. 4, 4a.
  • the inner and outer configurations of the slots as referred to above are the surfaces designated 35 and 37, respectively.
  • FIG. 6 Shown in FIG. 6 is another orifice configuration that can be provided with a punch of this invention.
  • Nominal values for dimensions indicated in this figure are: a, 0.033 inch; b, 0.004 inch; c, 0.003 inch; d, 0.0065 inch; e, 0.002 inch; R, 0.008 inch; r, 0.003 inch.
  • the line represented by radius R may be replaced by a straight line which may form an angle with the end of the segment as indicated at h and wherein a nominal value for h may be 45.
  • a method for producing a die punch tool from soft punch stock for forming a complex spinneret nozzle having a plurality of slots each of said slots having inner and outer configurations comprising: machining a hole axially into one end of said soft punch stock; broaching said hole to conform to the inner configuration of said slots; machining the outer portion of said stock to conform to the outer configuration of said slots; removing punch stock material to form male die segments; and hardening the stock.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
US00262493A 1972-06-14 1972-06-14 Method for producing a punch Expired - Lifetime US3768343A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26249372A 1972-06-14 1972-06-14

Publications (1)

Publication Number Publication Date
US3768343A true US3768343A (en) 1973-10-30

Family

ID=22997753

Family Applications (1)

Application Number Title Priority Date Filing Date
US00262493A Expired - Lifetime US3768343A (en) 1972-06-14 1972-06-14 Method for producing a punch

Country Status (5)

Country Link
US (1) US3768343A (enrdf_load_stackoverflow)
JP (1) JPS4961413A (enrdf_load_stackoverflow)
DE (1) DE2330326A1 (enrdf_load_stackoverflow)
FR (1) FR2187495B1 (enrdf_load_stackoverflow)
GB (1) GB1413706A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834251A (en) * 1973-02-27 1974-09-10 Du Pont Method
US4405851A (en) * 1981-06-11 1983-09-20 Washington State University Research Foundation, Inc. Apparatus for transfer of metallic materials by electric discharge
US5330348A (en) * 1992-08-05 1994-07-19 E. I. Du Pont De Nemours And Company Spinneret for the production of hollow filaments
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
US20200238412A1 (en) * 2019-01-25 2020-07-30 Snap-On Incorporated Method of manufacturing socket punches

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58169507A (ja) * 1982-03-26 1983-10-06 Tanaka Kikinzoku Kogyo Kk 中空糸紡糸用口金
JP3992161B2 (ja) * 1996-09-13 2007-10-17 株式会社ジェイテクト ハブユニット軸受フランジ部のボルト孔加工方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2066372A (en) * 1935-10-03 1937-01-05 American Screw Co Method of making dies or punches
US2847069A (en) * 1955-12-06 1958-08-12 John F Kopczynski Fluted perforating punch devices or tools
US3190107A (en) * 1962-12-13 1965-06-22 Extrusion Dies Inc Extrusion die

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2066372A (en) * 1935-10-03 1937-01-05 American Screw Co Method of making dies or punches
US2847069A (en) * 1955-12-06 1958-08-12 John F Kopczynski Fluted perforating punch devices or tools
US3190107A (en) * 1962-12-13 1965-06-22 Extrusion Dies Inc Extrusion die

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834251A (en) * 1973-02-27 1974-09-10 Du Pont Method
US4405851A (en) * 1981-06-11 1983-09-20 Washington State University Research Foundation, Inc. Apparatus for transfer of metallic materials by electric discharge
US5330348A (en) * 1992-08-05 1994-07-19 E. I. Du Pont De Nemours And Company Spinneret for the production of hollow filaments
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
US20200238412A1 (en) * 2019-01-25 2020-07-30 Snap-On Incorporated Method of manufacturing socket punches
US10987745B2 (en) * 2019-01-25 2021-04-27 Snap-On Incorporated Method of manufacturing socket punches

Also Published As

Publication number Publication date
GB1413706A (en) 1975-11-12
FR2187495A1 (enrdf_load_stackoverflow) 1974-01-18
DE2330326A1 (de) 1974-01-03
FR2187495B1 (enrdf_load_stackoverflow) 1976-11-12
JPS4961413A (enrdf_load_stackoverflow) 1974-06-14

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