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US20090078021A1 - Metal sheet pressing method - Google Patents

Metal sheet pressing method Download PDF

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Publication number
US20090078021A1
US20090078021A1 US12/292,320 US29232008A US2009078021A1 US 20090078021 A1 US20090078021 A1 US 20090078021A1 US 29232008 A US29232008 A US 29232008A US 2009078021 A1 US2009078021 A1 US 2009078021A1
Authority
US
United States
Prior art keywords
metal sheet
pressing
perforated portion
baking
heated
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.)
Abandoned
Application number
US12/292,320
Inventor
Minoru Ishihara
Toshio Kayao
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US12/292,320 priority Critical patent/US20090078021A1/en
Publication of US20090078021A1 publication Critical patent/US20090078021A1/en
Priority to US12/585,799 priority patent/US20100218584A1/en
Priority to US12/960,934 priority patent/US20110265542A1/en
Priority to US13/429,481 priority patent/US20120180544A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • 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
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • B21D31/02—Stabbing or piercing, e.g. for making sieves
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling

Definitions

  • the present invention relates to a method for pressing a steel sheet and more particularly to improvement of a pressing method for pressing a fragile portion of a steel sheet.
  • an object of the present invention is to provide a metal sheet pressing method of pressing a metal sheet into an uneven-surface shape with press dies, in which a precision pressing work can be done with ease.
  • the present invention aims at providing a pressing method capable of pressing only a fragile portion so as to form an uneven-surface shape accurately when a metal sheet is subjected to precision-pressing work.
  • the perforated portion 1 a of the metal sheet 1 can be formed into a mesh-like shape as shown in FIG. 1 .
  • the metal sheet 1 when the metal sheet 1 is precision-pressed, only a fragile portion such as the perforated portion 1 a formed by drawing is heated by baking as shown in FIG. 3 .
  • the fragile portion after heated by baking is pressed with press dies 3 a , 3 b having an uneven-surface shape corresponding to the uneven-surface shape 1 b (shown in FIG. 2 ) to be finally formed. Consequently, the fragile portion can be stretched uniformly and largely through a single process. Consequently, uneven-surface shape can be formed accurately.
  • a metal sheet pressing method by which uneven-surface shape can be formed accurately without any formation defect is achieved. And, according to this method, forming speed can be reduced.
  • steel sheet, stainless steel sheet and the like can be employed as a metal sheet to be pressed. Namely, common steel, austenitic base stainless steel, ferrite base stainless steel, martensite stainless steel, two-phase stainless steel and the like can be employed.
  • the perforated portion is heated by baking and after it is heated by baking, the perforated portion is pressed with press dies into a desired uneven-surface shape.
  • a steel sheet to be adopted as that metal sheet it is preferable to use a steel sheet whose property is not changed despite annealing and which exerts the same characteristic as before heating after it is cooled.
  • the before described austenitic base stainless steel, ferrite base stainless steel, martensite stainless steel and two-phase stainless steel satisfy these requirements.
  • Heating of the perforated portion 1 a by baking can be carried out at temperatures of 800 to 1,000° C. with a heating unit such as a burner as shown in FIG. 3 .
  • a heating unit such as a burner as shown in FIG. 3 .
  • the fragile portion such as the perforated portion 1 a formed by drawing is heated accurately by baking.
  • a fence 4 is provided as shown in FIG. 3 to protect a flame of the heating unit 2 from swinging.
  • the fragile portion in the metal sheet formed by drawing is heated by baking, so that the uneven-surface shape can be formed precisely and easily by pressing. Consequently, the fragile portion in which a frame or meshes are formed by drawing can be stretched accurately into a proper shape with a uniform thickness and formed into an uneven-surface shape of a desired size. Consequently, productivity is improved and further, percentage of defects can be reduced.
  • FIG. 1 is a plan view for explaining a state in which a metal sheet is partially drawn
  • FIG. 2 is a sectional view taken along the line A-A of a metal sheet pressed according to the method of the present invention
  • FIG. 3 is a sectional view taken along the line A-A in FIG. 1 for explaining heating process by baking;
  • FIG. 4 is a sectional view taken along the line A-A in FIG. 1 for explaining a process of pressing a fragile portion after the heating process by baking.
  • Only the perforated portion 1 a formed in the mesh form is heated by baking locally to approximately 800 to 1,000° C. with a heating unit 2 such as a gas burner as shown in FIG. 3 .
  • a heating unit 2 such as a gas burner as shown in FIG. 3 .
  • a fence 4 is provided to prevent a flame from the heating unit 2 from swinging so that only the perforated portion 1 a is heated accurately by baking.
  • the perforated portion 1 a After that, as shown in FIG. 4 , by using pressing dies 3 a , 3 b corresponding to an uneven-surface shape to be formed finally as shown in FIG. 2 , the perforated portion 1 a , after heated by baking, is pressed into a protruded form having a radius of about 50 mm. Since at this time, other portion than the perforated portion 1 a subjected to heat treatment by baking is not heated, the other portion than the perforated portion 1 a maintains its proper shape as a frame so as to form an uneven-surface shape accurately when the perforated portion 1 a is pressed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1 a), the perforated portion (1 a) is heated by baking and after it is heated by baking, the perforated portion (1 a) is pressed with press dies into an uneven-surface shape.

Description

  • This application is a continuation of U.S. application Ser. No. 11/598,072, filed Nov. 13, 2006, which is a continuation of U.S. application Ser. No. 11/374,149, filed Mar. 14, 2006, which is a continuation of U.S. application Ser. No. 11/141,049, filed Jun. 1, 2005, which is a continuation of U.S. application Ser. No. 10/621,309, filed Jul. 18, 2003.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a method for pressing a steel sheet and more particularly to improvement of a pressing method for pressing a fragile portion of a steel sheet.
  • 2. Description of Prior Art
  • As a conventional method for pressing a metal sheet such as steel sheet, it has been well known that a thin steel sheet is placed on dies and pressed with a punch into a product configuration.
  • The above-mentioned pressing method with the punch has various inconveniences described below and therefore, means for solving these problems has been demanded.
  • That is, a formation method of pressing with the punch comprised of simple processes is not good at formation of a complicated uneven-surface shape. To cope with this problem, it is necessary, for example, to retard pressing speed extremely or deepen the formation gradually through multiple pressing steps.
  • This problem is particularly remarkable in formation of a fragile portion in which a narrow frame or meshes are formed. In the case where such a fragile portion is formed according to the formation method of pressing with a punch, work efficiency and formation efficiency drop largely.
  • In the case of forming a fragile portion having the narrow frame or meshes into an uneven-surface shape according to the method of pressing with the punch, actually, such a form as the narrow frame, meshes is punched out and then, a final product is drawn gradually through several steps using multiple dies each having a different degree of unevenness.
  • Even if such a press work with a great deal of labor and time is conducted, an uniform shape in that fragile portion cannot be maintained and it is difficult to draw a target material into a correct shape with a uniform thickness. Further, because a partial fracture or the like is likely to occur, the percentage of defects and manufacturing cost are increased.
    • SUMMARY OF THE INVENTION
  • In view of the above-described defects of the conventional method which needs a great deal of time and labor, an object of the present invention is to provide a metal sheet pressing method of pressing a metal sheet into an uneven-surface shape with press dies, in which a precision pressing work can be done with ease. Particularly, the present invention aims at providing a pressing method capable of pressing only a fragile portion so as to form an uneven-surface shape accurately when a metal sheet is subjected to precision-pressing work.
  • The metal sheet pressing method of precision-pressing the metal sheet proposed by the present invention to achieve the above-described object will be described with reference to the accompanying drawings. That is, after a metal sheet 1 is partially drawn so as to form a perforated portion 1 a, the perforated portion 1 a is heated by baking and after it is heated by baking, the perforated portion 1 a is pressed with press dies 3 a, 3 b into an uneven-surface shape.
  • The perforated portion 1 a of the metal sheet 1 can be formed into a mesh-like shape as shown in FIG. 1.
  • According to the present invention, when the metal sheet 1 is precision-pressed, only a fragile portion such as the perforated portion 1 a formed by drawing is heated by baking as shown in FIG. 3. Next, as shown in FIG. 4, the fragile portion after heated by baking is pressed with press dies 3 a, 3 b having an uneven-surface shape corresponding to the uneven-surface shape 1 b (shown in FIG. 2) to be finally formed. Consequently, the fragile portion can be stretched uniformly and largely through a single process. Consequently, uneven-surface shape can be formed accurately. As a result, a metal sheet pressing method by which uneven-surface shape can be formed accurately without any formation defect is achieved. And, according to this method, forming speed can be reduced.
  • As a metal sheet to be pressed, steel sheet, stainless steel sheet and the like can be employed. Namely, common steel, austenitic base stainless steel, ferrite base stainless steel, martensite stainless steel, two-phase stainless steel and the like can be employed.
  • According to the present invention, after the metal sheet is partially drawn so as to form the perforated portion, the perforated portion is heated by baking and after it is heated by baking, the perforated portion is pressed with press dies into a desired uneven-surface shape. As a steel sheet to be adopted as that metal sheet, it is preferable to use a steel sheet whose property is not changed despite annealing and which exerts the same characteristic as before heating after it is cooled. The before described austenitic base stainless steel, ferrite base stainless steel, martensite stainless steel and two-phase stainless steel satisfy these requirements.
  • Heating of the perforated portion 1 a by baking can be carried out at temperatures of 800 to 1,000° C. with a heating unit such as a burner as shown in FIG. 3. At this time, preferably, the fragile portion such as the perforated portion 1 a formed by drawing is heated accurately by baking. Then, as a good measure for this purpose, a fence 4 is provided as shown in FIG. 3 to protect a flame of the heating unit 2 from swinging.
  • As described above, according to the present invention, only the fragile portion in the metal sheet formed by drawing is heated by baking, so that the uneven-surface shape can be formed precisely and easily by pressing. Consequently, the fragile portion in which a frame or meshes are formed by drawing can be stretched accurately into a proper shape with a uniform thickness and formed into an uneven-surface shape of a desired size. Consequently, productivity is improved and further, percentage of defects can be reduced.
    • BRIEF DESCRIPTION OF DRAWINGS
  • FIG. 1 is a plan view for explaining a state in which a metal sheet is partially drawn;
  • FIG. 2 is a sectional view taken along the line A-A of a metal sheet pressed according to the method of the present invention;
  • FIG. 3 is a sectional view taken along the line A-A in FIG. 1 for explaining heating process by baking; and
  • FIG. 4 is a sectional view taken along the line A-A in FIG. 1 for explaining a process of pressing a fragile portion after the heating process by baking.
    •  DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Hereinafter, the preferred embodiment of the present invention will be described with reference to the accompanying drawings.
  • When an austenitic base stainless steel sheet having a thickness of 0.5 t is formed by drawing into a desired product shape as shown in FIG. 1, its perforated portion 1 a is formed into meshes about 5 mm.
  • Only the perforated portion 1 a formed in the mesh form is heated by baking locally to approximately 800 to 1,000° C. with a heating unit 2 such as a gas burner as shown in FIG. 3.
  • According to the embodiment shown in FIG. 3, a fence 4 is provided to prevent a flame from the heating unit 2 from swinging so that only the perforated portion 1 a is heated accurately by baking.
  • After that, as shown in FIG. 4, by using pressing dies 3 a, 3 b corresponding to an uneven-surface shape to be formed finally as shown in FIG. 2, the perforated portion 1 a, after heated by baking, is pressed into a protruded form having a radius of about 50 mm. Since at this time, other portion than the perforated portion 1 a subjected to heat treatment by baking is not heated, the other portion than the perforated portion 1 a maintains its proper shape as a frame so as to form an uneven-surface shape accurately when the perforated portion 1 a is pressed.
  • Consequently, a product in which the perforated portion 1 a, which is the fragile portion, is formed such that it is largely protruded can be formed as shown in FIG. 2.
  • In the foregoing, preferable embodiment of the present invention is described, but the present invention is not limited to the above-described embodiment and can be carried out in various modes within the technical scope described in the claims.

Claims (2)

1. A metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet is partially drawn so as to form a perforated portion, the perforated portion is heated by baking and after it is heated by baking, the perforated portion is pressed with press dies into an uneven-surface shape.
2. A metal sheet pressing method according to claim 1, wherein the perforated portion of the metal sheet is formed in a mesh shape.
US12/292,320 2002-07-19 2008-11-17 Metal sheet pressing method Abandoned US20090078021A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US12/292,320 US20090078021A1 (en) 2002-07-19 2008-11-17 Metal sheet pressing method
US12/585,799 US20100218584A1 (en) 2002-07-19 2009-09-24 Metal sheet pressing method
US12/960,934 US20110265542A1 (en) 2002-07-19 2010-12-06 Metal sheet pressing method
US13/429,481 US20120180544A1 (en) 2002-07-19 2012-03-26 Metal sheet pressing method

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP2002211158A JP2004050230A (en) 2002-07-19 2002-07-19 Press forming method for metal sheet
JP2002-211158 2002-07-19
US10/621,309 US20040016280A1 (en) 2002-07-19 2003-07-18 Metal sheet pressing method
US11/141,049 US20050204795A1 (en) 2002-07-19 2005-06-01 Metal sheet pressing method
US11/374,149 US20060150704A1 (en) 2002-07-19 2006-03-14 Metal sheet pressing method
US11/598,072 US20070056344A1 (en) 2002-07-19 2006-11-13 Metal sheet pressing method
US11/898,162 US20080006073A1 (en) 2002-07-19 2007-09-10 Metal sheet pressing method
US12/292,320 US20090078021A1 (en) 2002-07-19 2008-11-17 Metal sheet pressing method

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
US11/598,072 Continuation US20070056344A1 (en) 2002-07-19 2006-11-13 Metal sheet pressing method
US11/898,162 Continuation US20080006073A1 (en) 2002-07-19 2007-09-10 Metal sheet pressing method

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/585,799 Continuation US20100218584A1 (en) 2002-07-19 2009-09-24 Metal sheet pressing method

Publications (1)

Publication Number Publication Date
US20090078021A1 true US20090078021A1 (en) 2009-03-26

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ID=30767762

Family Applications (9)

Application Number Title Priority Date Filing Date
US10/621,309 Abandoned US20040016280A1 (en) 2002-07-19 2003-07-18 Metal sheet pressing method
US11/141,049 Abandoned US20050204795A1 (en) 2002-07-19 2005-06-01 Metal sheet pressing method
US11/374,149 Abandoned US20060150704A1 (en) 2002-07-19 2006-03-14 Metal sheet pressing method
US11/598,072 Abandoned US20070056344A1 (en) 2002-07-19 2006-11-13 Metal sheet pressing method
US11/898,162 Abandoned US20080006073A1 (en) 2002-07-19 2007-09-10 Metal sheet pressing method
US12/292,320 Abandoned US20090078021A1 (en) 2002-07-19 2008-11-17 Metal sheet pressing method
US12/585,799 Abandoned US20100218584A1 (en) 2002-07-19 2009-09-24 Metal sheet pressing method
US12/960,934 Abandoned US20110265542A1 (en) 2002-07-19 2010-12-06 Metal sheet pressing method
US13/429,481 Abandoned US20120180544A1 (en) 2002-07-19 2012-03-26 Metal sheet pressing method

Family Applications Before (5)

Application Number Title Priority Date Filing Date
US10/621,309 Abandoned US20040016280A1 (en) 2002-07-19 2003-07-18 Metal sheet pressing method
US11/141,049 Abandoned US20050204795A1 (en) 2002-07-19 2005-06-01 Metal sheet pressing method
US11/374,149 Abandoned US20060150704A1 (en) 2002-07-19 2006-03-14 Metal sheet pressing method
US11/598,072 Abandoned US20070056344A1 (en) 2002-07-19 2006-11-13 Metal sheet pressing method
US11/898,162 Abandoned US20080006073A1 (en) 2002-07-19 2007-09-10 Metal sheet pressing method

Family Applications After (3)

Application Number Title Priority Date Filing Date
US12/585,799 Abandoned US20100218584A1 (en) 2002-07-19 2009-09-24 Metal sheet pressing method
US12/960,934 Abandoned US20110265542A1 (en) 2002-07-19 2010-12-06 Metal sheet pressing method
US13/429,481 Abandoned US20120180544A1 (en) 2002-07-19 2012-03-26 Metal sheet pressing method

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US (9) US20040016280A1 (en)
JP (1) JP2004050230A (en)

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* Cited by examiner, † Cited by third party
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JP6085878B2 (en) * 2012-09-12 2017-03-01 内山工業株式会社 Metal plate processing method and metal net
CN104014674B (en) * 2014-05-23 2016-09-28 中国第一重型机械集团大连加氢反应器制造有限公司 A kind of baking type steel sheet pressure head heating device and using method thereof
CN105887705B (en) * 2016-06-21 2017-11-10 管伟 A kind of horizontal concrete goes up spike devices automatically
CN109108131A (en) * 2018-07-24 2019-01-01 阜阳市圣贝诺装饰工程有限公司 A kind of electromechanical equipment Hardware fitting heat pressing forming device
CN111421049B (en) * 2018-12-23 2022-03-08 南京理工大学 A kind of preparation method of double-phase isomerism strengthening weldless box body
KR20210155437A (en) * 2020-06-15 2021-12-23 삼성디스플레이 주식회사 Window molding apparatus and window molding method using the same

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US3123910A (en) * 1964-03-10 neilson
US3307387A (en) * 1963-12-11 1967-03-07 Rohr Corp Method and apparatus for perforating and corrugating metallic ribbon
US3373480A (en) * 1965-12-08 1968-03-19 Western Electric Co Methods for shaping honeycomb structures
US3627608A (en) * 1969-06-16 1971-12-14 Woodall Industries Inc Method of forming a panel having a compound curvature
US3703093A (en) * 1969-11-11 1972-11-21 Aisin Seiki Process and apparatus for performing a simultaneous and combined press-forming and heat-treatment of steel stock
US3914969A (en) * 1973-04-18 1975-10-28 Nasa Apparatus for forming dished ion thruster grids
US4462144A (en) * 1980-03-20 1984-07-31 White Charles A Stamped low friction bearing, and process for making same
US4615205A (en) * 1984-06-18 1986-10-07 Rca Corporation Forming a shadow mask from a flat blank
US4846747A (en) * 1986-07-04 1989-07-11 Kabushiki Kaisha Toshiba Shadow mask, and method of manufacturing the same
US5119658A (en) * 1989-12-18 1992-06-09 Sollac Method and device for forming a sheet-metal blank in particular in order to make a cathode ray tube mask, and cathode ray tube mask obtained according to this method
US5271142A (en) * 1991-05-09 1993-12-21 Soundwich, Inc. Method for producing a sound-dampened automotive enclosure
US5306190A (en) * 1991-10-23 1994-04-26 Videocolor Spa Forming process for a sheet of perforated metal and process implementation device
US5390519A (en) * 1992-11-27 1995-02-21 Nippondenso Co., Ltd. Method for manufacturing long products by press working
US5626051A (en) * 1994-04-22 1997-05-06 Packinox Process and device for forming a corrugated metal sheet and corrugated metal sheet obtained by this process
US6003359A (en) * 1997-03-04 1999-12-21 Institute Of Technology Precision Electrical Discharge Works Progressive deep-drawing machine
US6401509B1 (en) * 1999-09-17 2002-06-11 Peter Amborn Method for producing a hollow body made of metal
US7024907B2 (en) * 2001-02-09 2006-04-11 L'air Liquide - Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and device for manufacturing a structured packing corrugation, and corresponding fluid-treatment apparatus

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US3213658A (en) * 1963-11-21 1965-10-26 Buckbee Mears Co Forming dome-shaped mesh
US4077247A (en) * 1975-09-30 1978-03-07 United Technologies Corporation Method and apparatus for improving the formability of sheet metal
ES2042037T3 (en) * 1988-10-05 1993-12-01 Sollac PROCEDURE AND DEVICE FOR CONFORMING A PIECE OF SHEET, ESPECIALLY TO PERFORM A CATHODIC TUBE SCREEN OBTAINED ACCORDING TO THIS PROCEDURE.

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Publication number Priority date Publication date Assignee Title
US3123910A (en) * 1964-03-10 neilson
US3307387A (en) * 1963-12-11 1967-03-07 Rohr Corp Method and apparatus for perforating and corrugating metallic ribbon
US3373480A (en) * 1965-12-08 1968-03-19 Western Electric Co Methods for shaping honeycomb structures
US3627608A (en) * 1969-06-16 1971-12-14 Woodall Industries Inc Method of forming a panel having a compound curvature
US3703093A (en) * 1969-11-11 1972-11-21 Aisin Seiki Process and apparatus for performing a simultaneous and combined press-forming and heat-treatment of steel stock
US3914969A (en) * 1973-04-18 1975-10-28 Nasa Apparatus for forming dished ion thruster grids
US4462144A (en) * 1980-03-20 1984-07-31 White Charles A Stamped low friction bearing, and process for making same
US4615205A (en) * 1984-06-18 1986-10-07 Rca Corporation Forming a shadow mask from a flat blank
US4846747A (en) * 1986-07-04 1989-07-11 Kabushiki Kaisha Toshiba Shadow mask, and method of manufacturing the same
US5119658A (en) * 1989-12-18 1992-06-09 Sollac Method and device for forming a sheet-metal blank in particular in order to make a cathode ray tube mask, and cathode ray tube mask obtained according to this method
US5271142A (en) * 1991-05-09 1993-12-21 Soundwich, Inc. Method for producing a sound-dampened automotive enclosure
US5306190A (en) * 1991-10-23 1994-04-26 Videocolor Spa Forming process for a sheet of perforated metal and process implementation device
US5390519A (en) * 1992-11-27 1995-02-21 Nippondenso Co., Ltd. Method for manufacturing long products by press working
US5626051A (en) * 1994-04-22 1997-05-06 Packinox Process and device for forming a corrugated metal sheet and corrugated metal sheet obtained by this process
US6003359A (en) * 1997-03-04 1999-12-21 Institute Of Technology Precision Electrical Discharge Works Progressive deep-drawing machine
US6401509B1 (en) * 1999-09-17 2002-06-11 Peter Amborn Method for producing a hollow body made of metal
US7024907B2 (en) * 2001-02-09 2006-04-11 L'air Liquide - Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and device for manufacturing a structured packing corrugation, and corresponding fluid-treatment apparatus

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US20050204795A1 (en) 2005-09-22
US20080006073A1 (en) 2008-01-10
US20120180544A1 (en) 2012-07-19
JP2004050230A (en) 2004-02-19
US20060150704A1 (en) 2006-07-13
US20040016280A1 (en) 2004-01-29
US20100218584A1 (en) 2010-09-02
US20070056344A1 (en) 2007-03-15
US20110265542A1 (en) 2011-11-03

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