US2157354A - Embossing metal plates - Google Patents

Embossing metal plates Download PDF

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US2157354A
US2157354A US189925A US18992538A US2157354A US 2157354 A US2157354 A US 2157354A US 189925 A US189925 A US 189925A US 18992538 A US18992538 A US 18992538A US 2157354 A US2157354 A US 2157354A
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metal
plate
die
flange
embossment
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US189925A
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Donald W Sherman
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AO Smith Corp
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AO Smith Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces
    • B21C37/292—Forming collars by drawing or pushing a rigid forming tool through an opening in the tube wall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • B21D19/088—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for flanging holes
    • 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
    • B21K23/00—Making other articles
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/496—Multiperforated metal article making

Definitions

  • This invention relates to embossing metal plates andis'particularly adapted to the embossing of sheet metal for forming a high circular embossment capable of being threaded.
  • the present invention is based upon the discovery that an embossment can be formed in ordinary sheet steel by a combined forming and 20 extruding operation, with a single stroke of the dies, and in which a higher embossment is produced having better threading quality.
  • the male and female die members are concentric and substan- 25 tially cylindrical in form and have a difference in radius less than the thickness of the sheet stock being worked upon.
  • the principal object of the invention is to provide a method of embossing sheet metal which 30 will produce a high embossment in a single operation of combined forming and coining.
  • Another object is to provide an embossment in plate metal which is stronger and more suitable for threading.
  • Figure 1 is a central longitudinal section through the die members before starting a forming operation and showing a sheet metal plate in position therebetween;
  • Fig. 2 is a similar view showing the dies as they start forming the flange
  • Fig. 3 is a similar view showing the completion of the flrst step in the formation of the flange;
  • Fig. 4 is a similar view showing the starting of the second step;
  • Fig. 5 is a similar view showing the completion" 7 I is provided with a relatively small hole 2 at the center of the proposed embossment to serve as a guide for the die and to prevent tearing of the metal as the dies move together.
  • the plate I is placed on the female die member 3 with the hole 2 centered .with respect to the opening 4 through member 3.
  • the opening 4 is of greater diameter than the desired final opening in plate I, but is of considerably less diameter relative 'to said final opening than would be necessary to allow for the formation of a flange of the same thickness as the plate I.
  • the male die member 5 preferably has two sections. Its forwardsection 5 has a small pilot projection I at the center of its forward end to engage in the hole 2 in plate I for centering the dies and plate relatively.
  • the section 6 is substantially cylindrical and is of a diameter preferably somewhat less than that of the final opening in plate I, but greater than would be necessary to allow for the formation between it and the die member 3 of a flange of the same thickness as that of plate I. 7
  • a circumferential groove 8 which is provided to relieve the metal of the flange from pressure as the second section 9 of the die enters into operation.
  • the second section 9 is substantially cylindrical and has the same diameter as that of the desired final opening in plate I.
  • Both sections 6 and 9 of the die 5 have rather blunt curved approaches at their forward ends to prevent tearing of the metal. It is understood that die life may be increased by utilizing a good lubricant as employed in general drawing practice and that for the more diiflcult operations a good drawing stock should be employed. Likewise where the embossmei to be formed is of relatively large size the hole 2 in the plate should beformedby, processes which eliminate any burrsor incipient cracks at the edge of the hole and it is well to have the lower corner edge slightly rounded as is clearly indicated in Figure 1 of the drawing.
  • the metal of the plate I around the hole 2 is pushed into the opening 4 in the die member 3.
  • the die section 6 advances it starts to extrude the metal ahead of it, thereby forming a flange between it and the die 3 of less thickness than the original stock and counteracting the stretching of the metal immediately adjacent the hole 2.
  • the stress on the metal at the edge *of hole 2 f is considerably reduced and tearing is prevented. This is illustrated in Fig. 2.
  • a cylindrical flange I is formed between it and die 3 of less thickness than that of the original stock, but preferably of greater thickness and less internal diameter than that of the final desired flange.
  • Fig. 4 illustrates the flnal completed operation in which the flange I0 is finally formed having the desired thickness and diameter.
  • Fig. 6 shows the finished flange or embossment In after the plate I has been removed from the dies.
  • Fig. 7 shows the final threaded flange.
  • metal flow in operation will depend largely upon the characteristics of the metal.
  • a soft, low carbon steel will have a wider range of possible metal flow than will a hard, relatively high carbon steel, and certain brittle or hard steels or metals may not be adaptable in many cases.
  • the invention finds its principal use in the softer drawing steels, preferably not in excess of 25% carbon, such as are used in many structures fabricated of sheet metal today.
  • the amount of metal flow is limited between no reduction in thickness of the metal on the one hand and too great a reduction on the other.
  • the flange It will be of the same thickness as plate I and will not be satisfactory for the present invention.
  • the flange III By forming the flange III of less thickness than the plate I, as explained above, tearing of the edges, as the metal around the hole 2 is stretched, is prevented by the extrusion or pushing of the metal ahead of the die 5. If, on the other hand, it is attempted to form flange Ill too thin the metal of plate I will tend to shear off and pass through the opening 4 in die 3 as a slug. It is preferable, however, to extrude as much as possible on the first operation in order to compensate properly for the stretching of the metal.
  • the amount of metal flow obtainable will also be determined by the size of the opening desired and the relative thickness of the stock. In general, the larger the opening, the more severe the flow of metal, and the thicker the stock, the greater the reduction obtainable with a single die member.
  • the height of'the flange or embossment obtainable will depend upon the thickness of the stock and the diameter of the opening desired.
  • a .l0-.15% carbon steel of thickness was embossed to a height of approximately 1 around an opening of lsz" diameter and the embossment had a wall thickness of approximately This was accomplished with a single die section similar to section 6 and by providing a starting hole 2 of 1 5" diameter. Similarly, by the use of section 9 of the die the opening was expanded to 1%" in diameter, the embossment was reduced to approximately thick and was heightened to about
  • the embossments formed under the present invention are more suitable for threading since the metal is somewhat hardened by the cold working, thus giving it better machineability without being so hard as to cause excessive wear on cutting tools.
  • the material after extrusion has greater resistance to shear. This, in connection with its increased hardness is important to the final use of articles. Where tapped for bolt attachment the threads have greater resistance to stripping, and where bearing loads are imposed the greater hardness results in longer life.
  • pilot hole 2 may be made smaller without danger of tearing the metal.
  • the exact size of the pilot hole 2 in any case will be determined by the thickness of stock, the size of opening and the size of flange desired.
  • the edges of the hole 2 should be free from burrs or roughness whic might cause a tendency to start a tear.
  • the method of producing a tubular embossment of substantial length upon plate metal comprising providing a relatively small opening in Y the plate stock, applying male and female dies thereto having a clearance less than the thickness of the stock and extruding the metal ahead of the male die member to prevent tearing of the metal at the edge of the opening as it is flowed to form the embossment and thereafter applying a larger male die member to enlarge the opening through the embossment and further refine the embossment.
  • the method of embossing plate metal comprising providing male and female die members, the male die member having a forward section of less diameter than that of the finished opening through the embossment and a second section of substantially the same diameter as that of the finished opening, applying said die members to the plate stock to form an unfinished embossment between the forward section of the male die memberand the female die member of less thickness than the plate stock, relieving said embossment from the pressure of said dies and then applying said second die section to enlarge the opening and produce the finished embossment.

Description

y 9, 1939- D. w. SHERMAN 2,157,354
EMBOSSING METAL PLATES Filed Feb. 11, 1958 FIG. 1.
/////, \6 I Z IL 7 Donald Vlijlzerman IN VENTOR.
ATTORNEY.
Patented May 9, 1939 UNITED STATES EMBOSSING METAL PLATES Donald W. Sherman, Shorewood, Wis, assignor to A. 0. Smith Corporation, Milwaukee, Wis., a
corporation of New York 1 Application February 11, 1938, Serial No. 189,925
3. Claims.
This invention relates to embossing metal plates andis'particularly adapted to the embossing of sheet metal for forming a high circular embossment capable of being threaded.
Heretofore, in the embossing or flanging of plates around openings therein it has been the practice to employ male and female die members having a. dilference in radius equal to the thickness of the plate so that the flange produced 10 would be of the same thickness as the original plate. This was thought to be necessary to prevent the metal from tearing around the opening as the flange was formed. In this practice it was necessary to add the step of coining to ob- 15 tain the desired shape of opening and the flange was usually too short for eflicient threading.
The present invention'is based upon the discovery that an embossment can be formed in ordinary sheet steel by a combined forming and 20 extruding operation, with a single stroke of the dies, and in which a higher embossment is produced having better threading quality.
In carrying out the invention the male and female die members are concentric and substan- 25 tially cylindrical in form and have a difference in radius less than the thickness of the sheet stock being worked upon.
The principal object of the invention is to provide a method of embossing sheet metal which 30 will produce a high embossment in a single operation of combined forming and coining.
Another object is to provide an embossment in plate metal which is stronger and more suitable for threading.
Other objects will appear hereinafter.
The practice of 'the invention is illustrated in the accompanying drawing in which:
Figure 1 is a central longitudinal section through the die members before starting a forming operation and showing a sheet metal plate in position therebetween;
Fig. 2 is a similar view showing the dies as they start forming the flange;
Fig. 3 is a similar view showing the completion of the flrst step in the formation of the flange; Fig. 4 is a similar view showing the starting of the second step;
Fig. 5 is a similar view showing the completion" 7 I is provided with a relatively small hole 2 at the center of the proposed embossment to serve as a guide for the die and to prevent tearing of the metal as the dies move together.
The plate I is placed on the female die member 3 with the hole 2 centered .with respect to the opening 4 through member 3. The opening 4 is of greater diameter than the desired final opening in plate I, but is of considerably less diameter relative 'to said final opening than would be necessary to allow for the formation of a flange of the same thickness as the plate I.
Where a very high flange is desired the male die member 5 preferably has two sections. Its forwardsection 5 has a small pilot projection I at the center of its forward end to engage in the hole 2 in plate I for centering the dies and plate relatively. The section 6 is substantially cylindrical and is of a diameter preferably somewhat less than that of the final opening in plate I, but greater than would be necessary to allow for the formation between it and the die member 3 of a flange of the same thickness as that of plate I. 7
At the upper end of section 6 is a circumferential groove 8 which is provided to relieve the metal of the flange from pressure as the second section 9 of the die enters into operation. The second section 9 is substantially cylindrical and has the same diameter as that of the desired final opening in plate I.
Both sections 6 and 9 of the die 5 have rather blunt curved approaches at their forward ends to prevent tearing of the metal. It is understood that die life may be increased by utilizing a good lubricant as employed in general drawing practice and that for the more diiflcult operations a good drawing stock should be employed. Likewise where the embossmei to be formed is of relatively large size the hole 2 in the plate should beformedby, processes which eliminate any burrsor incipient cracks at the edge of the hole and it is well to have the lower corner edge slightly rounded as is clearly indicated in Figure 1 of the drawing.
In carrying out the invention, the metal of the plate I around the hole 2 is pushed into the opening 4 in the die member 3. As the die section 6 advances it starts to extrude the metal ahead of it, thereby forming a flange between it and the die 3 of less thickness than the original stock and counteracting the stretching of the metal immediately adjacent the hole 2. By extruding or pushing the metal ahead of the die the stress on the metal at the edge *of hole 2 f is considerably reduced and tearing is prevented. This is illustrated in Fig. 2.
As section 6 of die 5 progresses through the plate I as illustrated in Fig. 3 a cylindrical flange I is formed between it and die 3 of less thickness than that of the original stock, but preferably of greater thickness and less internal diameter than that of the final desired flange.
The die section 9 progressively pushes the metal ahead of it and by a flowing operation -it gradually reduces the thickness of the flange and enlargesits diameter as shown in Fig. 4. Fig, 5 illustrates the flnal completed operation in which the flange I0 is finally formed having the desired thickness and diameter.
Fig. 6 shows the finished flange or embossment In after the plate I has been removed from the dies. Fig. 7 shows the final threaded flange.
In practicing the invention it is desirable to employ the two section die 5 as illustrated where severe flowing of the metal is desired, but in many cases a single section is sufficient, as where the dimensions of flange ID are satisfactory. With different types of metals there are rather definite optimum limits for the amount of flow that should be obtained with a single die section.
The limits as to metal flow in operation will depend largely upon the characteristics of the metal. A soft, low carbon steel will have a wider range of possible metal flow than will a hard, relatively high carbon steel, and certain brittle or hard steels or metals may not be adaptable in many cases. The invention, therefore, finds its principal use in the softer drawing steels, preferably not in excess of 25% carbon, such as are used in many structures fabricated of sheet metal today.
In general, the amount of metal flow is limited between no reduction in thickness of the metal on the one hand and too great a reduction on the other. Where there is no reduction in thickness the flange It will be of the same thickness as plate I and will not be satisfactory for the present invention. By forming the flange III of less thickness than the plate I, as explained above, tearing of the edges, as the metal around the hole 2 is stretched, is prevented by the extrusion or pushing of the metal ahead of the die 5. If, on the other hand, it is attempted to form flange Ill too thin the metal of plate I will tend to shear off and pass through the opening 4 in die 3 as a slug. It is preferable, however, to extrude as much as possible on the first operation in order to compensate properly for the stretching of the metal.
The amount of metal flow obtainable will also be determined by the size of the opening desired and the relative thickness of the stock. In general, the larger the opening, the more severe the flow of metal, and the thicker the stock, the greater the reduction obtainable with a single die member. The height of'the flange or embossment obtainable will depend upon the thickness of the stock and the diameter of the opening desired.
The following illustration of a specific application of the invention will serve as an example. A .l0-.15% carbon steel of thickness was embossed to a height of approximately 1 around an opening of lsz" diameter and the embossment had a wall thickness of approximately This was accomplished with a single die section similar to section 6 and by providing a starting hole 2 of 1 5" diameter. Similarly, by the use of section 9 of the die the opening was expanded to 1%" in diameter, the embossment was reduced to approximately thick and was heightened to about The embossments formed under the present invention are more suitable for threading since the metal is somewhat hardened by the cold working, thus giving it better machineability without being so hard as to cause excessive wear on cutting tools. Furthermore, the material after extrusion has greater resistance to shear. This, in connection with its increased hardness is important to the final use of articles. Where tapped for bolt attachment the threads have greater resistance to stripping, and where bearing loads are imposed the greater hardness results in longer life. I
It is also possible to utilize more of the plate stock and thereby produce higher flanges since the pilot hole 2 may be made smaller without danger of tearing the metal. The exact size of the pilot hole 2 in any case will be determined by the thickness of stock, the size of opening and the size of flange desired. The edges of the hole 2 should be free from burrs or roughness whic might cause a tendency to start a tear.
The invention is claimed as follows:
1.-'-'I'he method of producing a tubular embossment of substantial length upon plate metal comprising providing a relatively small hole in the plate stock and applying male and female die members having a clearance less than the thickness of the stock, and extruding the metal ahead of the male die member to prevent excessive stress on the metal at the edge of said hole as the metal is flowed to form the embossment.
2. The method of producing a tubular embossment of substantial length upon plate metal comprising providing a relatively small opening in Y the plate stock, applying male and female dies thereto having a clearance less than the thickness of the stock and extruding the metal ahead of the male die member to prevent tearing of the metal at the edge of the opening as it is flowed to form the embossment and thereafter applying a larger male die member to enlarge the opening through the embossment and further refine the embossment.
3. The method of embossing plate metal comprising providing male and female die members, the male die member having a forward section of less diameter than that of the finished opening through the embossment and a second section of substantially the same diameter as that of the finished opening, applying said die members to the plate stock to form an unfinished embossment between the forward section of the male die memberand the female die member of less thickness than the plate stock, relieving said embossment from the pressure of said dies and then applying said second die section to enlarge the opening and produce the finished embossment.
DONALD W. SHERMAN.
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Cited By (46)

* Cited by examiner, † Cited by third party
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US2636253A (en) * 1948-02-20 1953-04-28 Illinois Tool Works Means for and method of producing sheet metal lock washers
DE760990C (en) * 1939-11-04 1953-05-11 Siemens Schuckertwerke A G Rotation protection when screwing current-carrying components with only one screw
US2703419A (en) * 1951-03-06 1955-03-08 Barth Corp Method and tool for swaging internal threads
US2859510A (en) * 1955-01-13 1958-11-11 Wheeling Steel Corp Method of forming a boiler head or the like
US2861335A (en) * 1954-02-26 1958-11-25 Huet Andre Method of forming a hollow box in a metal wall
DE1078521B (en) * 1954-02-26 1960-03-31 Andre Huet Device for necking pipe sockets
US2932884A (en) * 1955-03-28 1960-04-19 Lyon George Albert Method of providing bomb head shells with drop ring sockets
US3038253A (en) * 1958-04-28 1962-06-12 Besly Welles Corp Method of contracting a hole and tool therefor
US3066556A (en) * 1958-07-02 1962-12-04 Smith Corp A O Method and apparatus for establishing high fluid pressure
US3076670A (en) * 1959-07-09 1963-02-05 Leer Ind Ltd Van Sheet metal containers and a method of and apparatus for the manufacture thereof
US3087362A (en) * 1958-12-04 1963-04-30 Babcock & Wilcox Ltd Apparatus for extruding lateral nozzles on cylindrical body
US3104481A (en) * 1960-11-17 1963-09-24 Auburn Machine Works Inc Trench digger blade
US3178806A (en) * 1961-12-11 1965-04-20 Olin Mathieson Metal fabrication
US3257134A (en) * 1962-10-05 1966-06-21 Townsend Company Spur plate
US3358546A (en) * 1966-01-04 1967-12-19 Monarch Rubber Company Plate metal products with two-way extruded nuts
US3365997A (en) * 1964-12-21 1968-01-30 Monarch Rubber Company Extruded and threaded plate metal sleeve structures
US3365926A (en) * 1964-11-17 1968-01-30 Monarch Rubber Company Manufacture of plate metal parts with integral threaded fasteners
US3412593A (en) * 1965-12-16 1968-11-26 Monarch Rubber Company Manufacture of plate metal products with extended extruded integral sleeves
US3447357A (en) * 1965-09-28 1969-06-03 Heim Universal Corp Method of manufacturing a link member with a spherical bearing
US3457761A (en) * 1967-03-20 1969-07-29 Western Electric Co Method and apparatus for drawing and stretching a flat blank into a tubular shell
US3497890A (en) * 1967-08-31 1970-03-03 Threadline Fastener Corp Fastener and method of making the same
US3548430A (en) * 1968-08-02 1970-12-22 Ashtabula Bow Socket Co Wedge nut
US3985172A (en) * 1971-06-17 1976-10-12 General Motors Corporation Panel extruding nut and assembly
US4077247A (en) * 1975-09-30 1978-03-07 United Technologies Corporation Method and apparatus for improving the formability of sheet metal
US4109501A (en) * 1974-09-11 1978-08-29 Hidaka Engineering Co., Ltd. Method for the production of heat exchanger fins
US4111029A (en) * 1976-01-09 1978-09-05 Creusot-Loire Manufacture of pipe stubs in walls of very great thickness
US4161873A (en) * 1978-01-26 1979-07-24 Combustion Engineering, Inc. Internal and external extruded nipples or nozzles in pipe headers or boiler drums
US4254540A (en) * 1978-09-27 1981-03-10 William Bilak Stamped bevel gear
US4319477A (en) * 1979-01-29 1982-03-16 Koninklijke Emballage Industrie Van Leer B.V. Method and tool for producing a bushing structure having a polygonal flange
US4545231A (en) * 1982-08-16 1985-10-08 Grove Valve & Regulator Company Method of manufacturing a weld neck flange
US5312198A (en) * 1992-12-29 1994-05-17 Ran Enterprises, Inc. Jack extension tube
US5312080A (en) * 1992-03-12 1994-05-17 Walbro Corporation Fuel regulator mounting plate and forming process
EP0633132A1 (en) * 1993-06-26 1995-01-11 VAW Aluminium AG Sandwich panel with reinforced connecting holes and method for making it
US5536100A (en) * 1992-12-29 1996-07-16 Ran Enterprises, Inc. Mechanically joined tubular connection and process to form same
US5806358A (en) * 1995-12-08 1998-09-15 Leico Gmbh & Co. Werkzeugmaschinenbau Method and apparatus for the manufacture of a workpiece having a boss
US20040244458A1 (en) * 2003-06-04 2004-12-09 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.) Die set for press forming metal sheet and press forming method of metal sheet
US20070234776A1 (en) * 2006-04-11 2007-10-11 Fujifilm Corporation Press die, burring machining method, method of manufacturing pressed product, and pressed product
US20130152656A1 (en) * 2011-12-19 2013-06-20 Ricoh Company, Ltd. Thin plate burring processing method and thin plate female screw-forming method
US20150114067A1 (en) * 2012-04-27 2015-04-30 Kabushiki Kaisha F.C.C. Method for molding pressed component, method for manufacturing pressed component, and die for molding pressed component
US9174260B2 (en) * 2012-05-28 2015-11-03 Topre Corporation Hot press product and method of forming the same
US20160354833A1 (en) * 2015-06-02 2016-12-08 International Business Machines Corporation Manifold for a liquid cooling system
CN109175902A (en) * 2018-09-21 2019-01-11 北京长城华冠汽车科技股份有限公司 The manufacturing process of beam upper installing hole
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US10941799B2 (en) 2014-10-13 2021-03-09 Monogram Aerospace Fasterners, Inc. Deformable sleeve nut and a method of manufacturing
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Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760990C (en) * 1939-11-04 1953-05-11 Siemens Schuckertwerke A G Rotation protection when screwing current-carrying components with only one screw
US2636253A (en) * 1948-02-20 1953-04-28 Illinois Tool Works Means for and method of producing sheet metal lock washers
US2703419A (en) * 1951-03-06 1955-03-08 Barth Corp Method and tool for swaging internal threads
US2861335A (en) * 1954-02-26 1958-11-25 Huet Andre Method of forming a hollow box in a metal wall
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US2859510A (en) * 1955-01-13 1958-11-11 Wheeling Steel Corp Method of forming a boiler head or the like
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