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US3869899A - Method of forming a strip having substantially differing thicknesses - Google Patents

Method of forming a strip having substantially differing thicknesses Download PDF

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Publication number
US3869899A
US3869899A US400228A US40022873A US3869899A US 3869899 A US3869899 A US 3869899A US 400228 A US400228 A US 400228A US 40022873 A US40022873 A US 40022873A US 3869899 A US3869899 A US 3869899A
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United States
Prior art keywords
strip
thinner
thicker
thickness
thinner portion
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Expired - Lifetime
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US400228A
Inventor
Robert S Bray
Claude D Tapley
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.)
General Electric Co
Aurubis Buffalo Inc
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Anaconda Co
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Application filed by Anaconda Co filed Critical Anaconda Co
Priority to US400228A priority Critical patent/US3869899A/en
Priority to CA209,769A priority patent/CA1005262A/en
Priority to JP10893074A priority patent/JPS5711730B2/ja
Application granted granted Critical
Publication of US3869899A publication Critical patent/US3869899A/en
Assigned to ATLANTIC RICHFIELD COMPANY, A PA CORP. reassignment ATLANTIC RICHFIELD COMPANY, A PA CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ANACONDA COMPANY THE, A DE CORP
Assigned to AMERICAN BRASS COMPANY, L.P., A DELAWARE LIMITED PARTNERSHIP reassignment AMERICAN BRASS COMPANY, L.P., A DELAWARE LIMITED PARTNERSHIP ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED Assignors: ATLANTIC RICHFIELD COMPANY, A CORP. OF DE.
Assigned to HELLER FINANCIAL CENTRAL, INC., A CORP OF DELAWARE, CONTINENTAL BANK OF CANADA, A CANADIAN CHARTERED BANK reassignment HELLER FINANCIAL CENTRAL, INC., A CORP OF DELAWARE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN BRASS COMPANY, L.P., A DELAWARE LIMITED PARTNERSHIP
Assigned to ANSONIA COPPER & BRASS, INC., A CORP. OF DE. reassignment ANSONIA COPPER & BRASS, INC., A CORP. OF DE. LICENSE (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN BRASS COMPANY
Assigned to BANCBOSTON FINANCIAL COMPANY reassignment BANCBOSTON FINANCIAL COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANSONIA COPPER & BRASS, INC.,
Assigned to NORSTAR BANK, NATIONAL ASSOCIATION, A NATIONAL BANKING ASSOCIATION reassignment NORSTAR BANK, NATIONAL ASSOCIATION, A NATIONAL BANKING ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMERICAN BRASS COMPANY, L.P., A DE. LIMITED PARTNERSHIP
Assigned to OUTOKUMPU AMERICAN BRASS, INC., A CORP. OF DE reassignment OUTOKUMPU AMERICAN BRASS, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN BRASS COMPANY, L.P., A DE LIMITED PARTNERSHIP
Assigned to ANACONDA DELAWARE CORPORATION, A CORP. OF DELAWARE reassignment ANACONDA DELAWARE CORPORATION, A CORP. OF DELAWARE MERGER (SEE DOCUMENT FOR DETAILS). JANUARY 12, 1977, DELAWARE Assignors: ANACONDA COMPANY, THE, A CORP. OF MONTANA
Assigned to AMERICAN BRASS COMPANY, L.P., A DE LIMITED PARTNERSHIP reassignment AMERICAN BRASS COMPANY, L.P., A DE LIMITED PARTNERSHIP RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). SECURITY AGREEMENT RECORDED AT REEL 4510 FRAMES 187-203 Assignors: HELLER FINANCIAL, INC. AS SUCCESSOR BY MERGER TO HELLER FINANCIAL CENTRAL, INC.
Assigned to AMERICAN BRASS COMPANY, L.P., A DE LIMITED PARTNERSHIP reassignment AMERICAN BRASS COMPANY, L.P., A DE LIMITED PARTNERSHIP RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). SECURITY AGREEMENT RECORDED AT REEL 5327 FRAME 729 Assignors: NORSTAR BANK, NATIONAL ASSOCIATION
Assigned to ATLANTIC RICHFIELD DELAWARE CORPORATION, A CORP. OF DELAWARE reassignment ATLANTIC RICHFIELD DELAWARE CORPORATION, A CORP. OF DELAWARE MERGER (SEE DOCUMENT FOR DETAILS). JANUARY 12, 1977 DELAWARE Assignors: ANACONDA DELAWARE CORPORATION, A CORP. OF DELAWARE
Assigned to BANCBOSTON FINANCIAL COMPANY A MA CORPORATION reassignment BANCBOSTON FINANCIAL COMPANY A MA CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANSONIA COPPER & BRASS, INC., A DE CORPORATION
Assigned to ANACONDA COMPANY, THE A CORP. OF MONTANA reassignment ANACONDA COMPANY, THE A CORP. OF MONTANA MERGER (SEE DOCUMENT FOR DETAILS). Assignors: ANACONDA ALUMINUM COMPANY A CORP. OF MONTANA, ANACONDA AMERICAN BRASS COMPANY A CORP. OF CONNECTICUT, ANACONDA WIRE AND CABLE COMPANY A CORP. OF DELAWARE (INTO), INTERNATIONAL SMELTING AND REFINING COMPANY A CORP. OF MONTANA
Assigned to BANK OF BOSTON CONNECTICUT A CORP. OF CONNECTICUT reassignment BANK OF BOSTON CONNECTICUT A CORP. OF CONNECTICUT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANSONIA COPPER & BRASS, INC. A CORP. OF DELAWARE
Anticipated expiration legal-status Critical
Assigned to ANSONIA COPPER & BRASS, INC. reassignment ANSONIA COPPER & BRASS, INC. TERM. OF SECURITY INTEREST Assignors: FLEET NATIONAL BANK F/K/A BANK OF BOSTON CT
Assigned to ANSONIA COPPER & BRASS, INC. reassignment ANSONIA COPPER & BRASS, INC. RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: FLEET NATIONAL BANK FKA A BANK OF BOSTON CT
Assigned to GENERAL ELECTRIC CAPITAL CORPORATION reassignment GENERAL ELECTRIC CAPITAL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ANSONIA COPPER & BRASS, INC.
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/0805—Flat bars, i.e. having a substantially rectangular cross-section

Definitions

  • ABSTRACT A method of forming a strip having substantially differing thicknesses including a wide thinner section adjacent one edge and a thicker section adjacent the thinner section.
  • the wide thinner section is formed by first rolling a longitudinal depressed indentation in the section of strip which will later be formed into the thinner section while providing an edge material portion between the indentation and the edge of the strip. Thereafter the strip is further rolled'to further reduce the indentation and to reduce the edge material portion to form the thinner section.
  • the present invention provides a double rolling technique using two sets of rollers each having different engaging configurations. Through the use of two rolling operations and through the design of the rollers, as herein described, a wide thinner section can be readily rolled as part of the strip.
  • the present invention comprises a two pass forming operation in which the stock strip of generally rectangular configuration is rolled to form an indentation in a portion of the strip adjacent a strip edge while leaving an edge material portion raised above the indentation between said strip edge and the indentation.
  • the first pass is followed by a second pass which flattens the edge material portion and further reduces the indentation to form a wide thinner section of generally uniform thickness.
  • the strip, as formed in such steps, has also a portion adjacent the thinner portion which is thicker than the thinner portion.
  • the thinner section can be rolled to accurate dimensions.
  • a strip can be rapidly fabricated without any machining operation being required.
  • FIG. 1 is a sectional view of a stock strip usable in the practice of the invention
  • FIG. 2 is a sectional view of the stock strip after the first pass operation
  • FIG. 3 is a sectional view of the strip after the second pass operation.
  • strip 1 is a copper-bearing rectangular cross-sectional stock material which is suitable for shaping and forming using rolling techniques.
  • Other metal strips capable of being shaped by rolling mills used in industry may also be used.
  • Strip 1 is first passed through a pair of opposed rolls shaped and positioned to reduce the thicknesses of left hand section 2 (as viewed in FIG. 1) and to simulta- I neously form in the right hand section 3 a depression or indentation 4.
  • the reduced thickness area 5 positioned below indentation 4 has a surface generally parallel to lower surface profile 6 of the strip.
  • Portion 8 provides a reservoirof material for distribution at and near the edge area of section 3 during the second rolling operation and provides an important part of the present invention. Portion 8 assists in rapid and effective material distribution during the second rolling operation. Stepped rollers are used in the second pass to form the configuration shown in FIG. 3 including formed thicker portion 10 and formed thinner portion 11.
  • the overall width of the strip is increased with each reduction and thicker portion 2 is also reduced in each pass.
  • the shape of the depressed indentation 4 may be varied through a vertically oriented ledge 12 defining the inner end portion of the indentation is preferred.
  • the sloping outer end portion 13 of the indentation may alternatively be vertically disposed, if desired, or disposed at any other suitable angle.
  • the strip after being rolled to the configuration of FIG. 3, may be cut up into short lengths of an inch or less and used as an electrical connectors or lead frames.
  • the strip of FIG. 3 may be further rolled and shaped using conventional stepped rollers if reduced dimensions are desired.
  • the thinner portion is a wide portion in relationship to the overall width of the strip in that, absent the two step forming methods herein disclosed, it would be difficult or impossible to form the thinner section with the desired dimensions demanded by industry for certain electrical and electronic uses.
  • a wide thinner section is one that would cause rolling problems using prior methods and includes in most cases a width more than one third of the overall width of the formed strip. The thinness of the formed thinner portion of the strip is illustrated through the dimensions and proportions set forth in this paragraph.
  • a method of continuous roll forming an elongated strip having a generally-rectangular cross-sectional area to form a strip with a cross-sectional area including a formed thicker portion and a wide formedthinner portion comprising a. rolling the generally-rectangular strip to initially form an intermediate configuration having a thicker portion which is less thick than the generally-rectangular strip and a thinner portion which thinner portion has no thickness as great as the thicker portion and having a longitudinal depression positioned in the thinner portion and spaced from the outer edge of the strip to thereby form an edge material portion having a thickness greater than the remainder of the thinner portion;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

A method of forming a strip having substantially differing thicknesses including a wide thinner section adjacent one edge and a thicker section adjacent the thinner section. The wide thinner section is formed by first rolling a longitudinal depressed indentation in the section of strip which will later be formed into the thinner section while providing an edge material portion between the indentation and the edge of the strip. Thereafter the strip is further rolled to further reduce the indentation and to reduce the edge material portion to form the thinner section.

Description

United States Patent [191 Bray et al.
[4 1 Mar. 11, 1975 METHOD OF FORMING A STRIP HAVING SUBSTANTIALLY DIFFERING THICKNESSES [75] Inventors: Robert S. Bray; Claude D. Tapley,
both of Cheshire, Conn.
[73] Assignee: Anaconda American Brass C0., Waterbury, Conn.
22 Filed: Sept. 24, 1973 21 Appl. No.: 400,228
FOREIGN PATENTS OR APPLICATIONS 360,767 10/1922 Germany 72/366 Primary Examiner-Lowell A. Larson Attorney, Agent, or Firm-Pennie & Edmonds [57] ABSTRACT A method of forming a strip having substantially differing thicknesses including a wide thinner section adjacent one edge and a thicker section adjacent the thinner section. The wide thinner section is formed by first rolling a longitudinal depressed indentation in the section of strip which will later be formed into the thinner section while providing an edge material portion between the indentation and the edge of the strip. Thereafter the strip is further rolled'to further reduce the indentation and to reduce the edge material portion to form the thinner section.
3 Claims, 3 Drawing Figures PATENTEDHARI 1 MS 9.999.999
FIG. 2
FIG. 3
METHOD OF FORMING A STRIP HAVING SUBSTANTIALLY DIFFERING THICKNESSES BACKGROUND OF THE INVENTION The rolling of metal strips to form a section thinner than the remainder of the strip has not presented substantial problems where the width of thinner section was not a substantial portion of the entire width of the strip. As the width of the thinner section was increased, problems in forming a strip of desired straightness and dimensional accuracy were experienced. For example, the step rolling technique of U.S. Pat. No. 3,488,989 to Rakich et al. entitled Method of Producing Dual Gauge Strip," which patent is owned by the assignee of the present application, has been found ineffective in some applications requiring wide thinner sections.
The present invention provides a double rolling technique using two sets of rollers each having different engaging configurations. Through the use of two rolling operations and through the design of the rollers, as herein described, a wide thinner section can be readily rolled as part of the strip.
SUMMARY OF THE INVENTION Broadly, the present invention comprises a two pass forming operation in which the stock strip of generally rectangular configuration is rolled to form an indentation in a portion of the strip adjacent a strip edge while leaving an edge material portion raised above the indentation between said strip edge and the indentation. The first pass is followed by a second pass which flattens the edge material portion and further reduces the indentation to form a wide thinner section of generally uniform thickness. The strip, as formed in such steps, has also a portion adjacent the thinner portion which is thicker than the thinner portion.
It is a feature of the present invention that the thinner section can be rolled to accurate dimensions.
It is a further feature of the invention that a strip can be rapidly fabricated without any machining operation being required.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a stock strip usable in the practice of the invention;
FIG. 2 is a sectional view of the stock strip after the first pass operation; and
FIG. 3 is a sectional view of the strip after the second pass operation.
A DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1, 2 and 3 of the drawings, strip 1 is a copper-bearing rectangular cross-sectional stock material which is suitable for shaping and forming using rolling techniques. Other metal strips capable of being shaped by rolling mills used in industry may also be used.
Strip 1 is first passed through a pair of opposed rolls shaped and positioned to reduce the thicknesses of left hand section 2 (as viewed in FIG. 1) and to simulta- I neously form in the right hand section 3 a depression or indentation 4. The reduced thickness area 5 positioned below indentation 4 has a surface generally parallel to lower surface profile 6 of the strip. During the first pass, there is formed in section 3 between depressed indentation 4 and the strip edge 7 an edge material portion 8. Portion 8 provides a reservoirof material for distribution at and near the edge area of section 3 during the second rolling operation and provides an important part of the present invention. Portion 8 assists in rapid and effective material distribution during the second rolling operation. Stepped rollers are used in the second pass to form the configuration shown in FIG. 3 including formed thicker portion 10 and formed thinner portion 11.
In the preferred practice of the invention, the overall width of the strip is increased with each reduction and thicker portion 2 is also reduced in each pass. The shape of the depressed indentation 4 may be varied through a vertically oriented ledge 12 defining the inner end portion of the indentation is preferred. The sloping outer end portion 13 of the indentation may alternatively be vertically disposed, if desired, or disposed at any other suitable angle.
The strip, after being rolled to the configuration of FIG. 3, may be cut up into short lengths of an inch or less and used as an electrical connectors or lead frames. The strip of FIG. 3 may be further rolled and shaped using conventional stepped rollers if reduced dimensions are desired.
Success in obtaining good dimensioning has been achieved in a configuration having an overall width of 0.875 inches, a 0.05 inch formed thicker portion, a 0.025 inch thinner portion and a thinner portion having a 0.325 inch width (see FIG. 3). The thinner portion is a wide portion in relationship to the overall width of the strip in that, absent the two step forming methods herein disclosed, it would be difficult or impossible to form the thinner section with the desired dimensions demanded by industry for certain electrical and electronic uses. A wide thinner section is one that would cause rolling problems using prior methods and includes in most cases a width more than one third of the overall width of the formed strip. The thinness of the formed thinner portion of the strip is illustrated through the dimensions and proportions set forth in this paragraph.
We claim:
1. A method of continuous roll forming an elongated strip having a generally-rectangular cross-sectional area to form a strip with a cross-sectional area including a formed thicker portion and a wide formedthinner portion comprising a. rolling the generally-rectangular strip to initially form an intermediate configuration having a thicker portion which is less thick than the generally-rectangular strip and a thinner portion which thinner portion has no thickness as great as the thicker portion and having a longitudinal depression positioned in the thinner portion and spaced from the outer edge of the strip to thereby form an edge material portion having a thickness greater than the remainder of the thinner portion;
b. further rolling both thicker and thinner portions of the strip to reduce the thickness of the thicker portion and to reduce the thickness of the intermediate thinner portion while at the same time reducing the edge material portion to a thickness desired for the formed thinner portion thereby forming a strip having a formed thicker portion and formed thinner portion.
outer edge of the strip, the upper surface of the strip and a sloping portion extending down from the upper surface to the depression surface of the thinner section.

Claims (3)

1. A method of continuous roll forming an elongated strip having a generally-rectangular cross-sectional area to form a strip with a cross-sectional area including a formed thicker portion and a wide formed thinner portion comprising a. rolling the generally-rectangular strip to initially form an intermediate configuration having a thicker portion which is less thick than the generally-rectangular strip and a thinner portion which thinner portion has no thickness as great as the thicker portion and having a longitudinal depression positioned in the thinner portion and spaced from the outer edge of the strip to thereby form an edge material portion having a thickness greater than the remainder of the thinner portion; b. further rolling both thicker and thinner portions of the strip to reduce the thickness of the thicker portion and to reduce the thickness of the intermediate thinner portion while at the same time reducing the edge material portion to a thickness desired for the formed thinner portion thereby forming a strip having a formed thicker portion and formed thinner portion.
1. A method of continuous roll forming an elongated strip having a generally-rectangular cross-sectional area to form a strip with a cross-sectional area including a formed thicker portion and a wide formed thinner portion comprising a. rolling the generally-rectangular strip to initially form an intermediate configuration having a thicker portion which is less thick than the generally-rectangular strip and a thinner portion which thinner portion has no thickness as great as the thicker portion and having a longitudinal depression positioned in the thinner portion and spaced from the outer edge of the strip to thereby form an edge material portion having a thickness greater than the remainder of the thinner portion; b. further rolling both thicker and thinner portions of the strip to reduce the thickness of the thicker portion and to reduce the thickness of the intermediate thinner portion while at the same time reducing the edge material portion to a thickness desired for the formed thinner portion thereby forming a strip having a formed thicker portion and formed thinner portion.
2. The method of claim 1 in which the width of formed thinner portion is one third as wide as the overall strip width.
US400228A 1973-09-24 1973-09-24 Method of forming a strip having substantially differing thicknesses Expired - Lifetime US3869899A (en)

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US400228A US3869899A (en) 1973-09-24 1973-09-24 Method of forming a strip having substantially differing thicknesses
CA209,769A CA1005262A (en) 1973-09-24 1974-09-23 Method of forming a strip having substantially differing thicknesses
JP10893074A JPS5711730B2 (en) 1973-09-24 1974-09-24

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2515541A1 (en) * 1981-10-30 1983-05-06 Griset Ets
FR2622488A1 (en) * 1987-10-28 1989-05-05 Griset Ets Installation for manufacturing a strip of deformable material with a non-constant cross section, particularly a metal strip and, in particular a copper strip
RU2650464C1 (en) * 2017-06-05 2018-04-13 Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" (УрФУ) Method of rolling the trapezoidal profiles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0354851A (en) * 1989-07-24 1991-03-08 Goto Seisakusho:Kk Manufacture of lead frame for semiconductor device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1915084A (en) * 1932-03-31 1933-06-20 P H Murphy Co Process of making sheets
US2371671A (en) * 1943-03-23 1945-03-20 Western Electric Co Metal rolling process
US3488989A (en) * 1967-09-27 1970-01-13 Anaconda American Brass Co Method of producing dual gauge strip

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1915084A (en) * 1932-03-31 1933-06-20 P H Murphy Co Process of making sheets
US2371671A (en) * 1943-03-23 1945-03-20 Western Electric Co Metal rolling process
US3488989A (en) * 1967-09-27 1970-01-13 Anaconda American Brass Co Method of producing dual gauge strip

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2515541A1 (en) * 1981-10-30 1983-05-06 Griset Ets
FR2622488A1 (en) * 1987-10-28 1989-05-05 Griset Ets Installation for manufacturing a strip of deformable material with a non-constant cross section, particularly a metal strip and, in particular a copper strip
RU2650464C1 (en) * 2017-06-05 2018-04-13 Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" (УрФУ) Method of rolling the trapezoidal profiles

Also Published As

Publication number Publication date
JPS5059266A (en) 1975-05-22
JPS5711730B2 (en) 1982-03-06
CA1005262A (en) 1977-02-15

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