US2112653A - Method of forming brake drums - Google Patents

Method of forming brake drums Download PDF

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Publication number
US2112653A
US2112653A US717497A US71749734A US2112653A US 2112653 A US2112653 A US 2112653A US 717497 A US717497 A US 717497A US 71749734 A US71749734 A US 71749734A US 2112653 A US2112653 A US 2112653A
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United States
Prior art keywords
blank
brake drums
die
thickness
flange
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Expired - Lifetime
Application number
US717497A
Inventor
Maclennan John
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.)
Kelsey Hayes Co
Original Assignee
Kelsey Hayes 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.)
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Publication date
Application filed by Kelsey Hayes Co filed Critical Kelsey Hayes Co
Priority to US717497A priority Critical patent/US2112653A/en
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Publication of US2112653A publication Critical patent/US2112653A/en
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    • 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
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/34—Making other particular articles wheels or the like brake drums
    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B21D35/006—Blanks having varying thickness, e.g. tailored blanks

Definitions

  • the invention relates to the manufacture of brake drums from sheet metal of uniform gauge and it is the object of the invention to obtain a product in which the braking flange is of greater thickness than the web portion of the drum.
  • the invention consists in the method as hereinafter set forth.
  • Fig. 1 is a side elevation of the uniform gauge sheet metal blank from which'the drum is to be formed;
  • Fig. 2 illustrates the first operation of reducing the thickness of the center portion of the blank relative to the thickness of the peripheral 5 portion thereof;
  • Fig. 3 illustrates the bowling of the blank and Fig. 4 the final operation of refashioning the bowled blank and forming the outwardly extending flange thereon.
  • the first step of my improved process is to cut a circular blank A from sheet metal of uniform gauge and of suificient thickness to form the cylindrical brake flange.
  • the mass of this blank corresponds to that of the finished product
  • the blank After removal from the dies B and C, the blank is reheated and subjected to a bowling operation, being pressed by a plunger D into a female die E.
  • the die E has the flaring mouth portion F in which the flat blank is first coned 45 before entering the cylindrical portion E and FIQE.
  • this conical portion is preferably provided with annular grooves F cut therein, leaving intermediate portions F of reduced area for fashioning the blank and thereby limiting the heat losses.
  • the space between the parallel cylindrical surfaces of the die D and cylindrical portion E of the die E is greater than the thickness of the metal in the peripheral portion of the blank so that during bowling a slight clearance will be left between the blank and the plunger D to facilitate the easy withdrawal of the latter.
  • the plunger D is provided with an enlarged portion D which in conjunction with the die E forms an outwardly obliquely flaring flange as indicated at G. This is subsequently refashioned to form a reinforcing flange for the drum.
  • the next step in the operation is the refashioning of the bowled blank by pressing it between dies H and I which suitably fashion the web portion.
  • dies H and I which suitably fashion the web portion.
  • annular dies J and K between which the oblique flange G is refashioned into the form indicated.
  • the drum constructed by the method above described has its web portion G -of a thin cross section in comparison with the cross section of the cylindrical flange G and the outwardly extending reinforcing flange G This increases finished product.
  • a method of forming blanks for brake drums the step of hot-pressing a circular sheet metal blank of uniform gauge between dies having parallel faces, the face of one of said dies being in a plane and the other die having a circular central portion less than the diameter of the blank in one plane, and a surrounding annular portion in an outwardly offset plane and squeezing the metal of the blank in the central portion thereof outwardly and thereby thinning this portion and increasing the diameter of the surrounding portion and the thickness thereof within the limits imposed by the opposite faces of said dies.

Description

March 29, 1938. J, MaCLENNAN 2,112,653
METHOD OF FORMING BRAKE DRUMS Filed March 26, 1934 INVENTOR g, W W
ATTORNEY/5' I Patented Mar. 29, 1938 METHOD OF FORlVIING BRAKE DRUMS John MacLennan, Detroit, Mich, assignor to Kelsey-Hayes Wheel Company, Detroit, Mich,
a corporation of Delaware Application March 26, 1934, Serial No. 717,497
1 Claim.
The invention relates to the manufacture of brake drums from sheet metal of uniform gauge and it is the object of the invention to obtain a product in which the braking flange is of greater thickness than the web portion of the drum. To this end the invention consists in the method as hereinafter set forth.
In the drawing:
Fig. 1 is a side elevation of the uniform gauge sheet metal blank from which'the drum is to be formed;
Fig. 2 illustrates the first operation of reducing the thickness of the center portion of the blank relative to the thickness of the peripheral 5 portion thereof;
Fig. 3 illustrates the bowling of the blank and Fig. 4 the final operation of refashioning the bowled blank and forming the outwardly extending flange thereon.
20 The first step of my improved process is to cut a circular blank A from sheet metal of uniform gauge and of suificient thickness to form the cylindrical brake flange. The mass of this blank corresponds to that of the finished product,
25 but its diameter is initially less than that required for forming the bowled blank. This blank A is then heated and subjected to a pressing operation between die members B and C. The die member C has its central portion C project- 30 ing beyond the peripheral portion C and intermediate these two portions is the tapering portion C Thus when pressure is applied, the central portion of the blank A will be squeezed to reduce its thickness and to flow the metal 5 radially outward into the space between the die B and the portion C of the die C. This will increase the diameter of the blank and may also effect an upsetting operation which will increase the thickness of the peripheral portion.
40 After removal from the dies B and C, the blank is reheated and subjected to a bowling operation, being pressed by a plunger D into a female die E. The die E has the flaring mouth portion F in which the flat blank is first coned 45 before entering the cylindrical portion E and FIQE.
this conical portion is preferably provided with annular grooves F cut therein, leaving intermediate portions F of reduced area for fashioning the blank and thereby limiting the heat losses. The space between the parallel cylindrical surfaces of the die D and cylindrical portion E of the die E is greater than the thickness of the metal in the peripheral portion of the blank so that during bowling a slight clearance will be left between the blank and the plunger D to facilitate the easy withdrawal of the latter. The plunger D is provided with an enlarged portion D which in conjunction with the die E forms an outwardly obliquely flaring flange as indicated at G. This is subsequently refashioned to form a reinforcing flange for the drum.
The next step in the operation is the refashioning of the bowled blank by pressing it between dies H and I which suitably fashion the web portion. There are also annular dies J and K between which the oblique flange G is refashioned into the form indicated.
The drum constructed by the method above described has its web portion G -of a thin cross section in comparison with the cross section of the cylindrical flange G and the outwardly extending reinforcing flange G This increases finished product.
What I claim as my invention is:
In a method of forming blanks for brake drums, the step of hot-pressing a circular sheet metal blank of uniform gauge between dies having parallel faces, the face of one of said dies being in a plane and the other die having a circular central portion less than the diameter of the blank in one plane, and a surrounding annular portion in an outwardly offset plane and squeezing the metal of the blank in the central portion thereof outwardly and thereby thinning this portion and increasing the diameter of the surrounding portion and the thickness thereof within the limits imposed by the opposite faces of said dies.
JOHN MACLENNAN.
US717497A 1934-03-26 1934-03-26 Method of forming brake drums Expired - Lifetime US2112653A (en)

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US717497A US2112653A (en) 1934-03-26 1934-03-26 Method of forming brake drums

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US717497A US2112653A (en) 1934-03-26 1934-03-26 Method of forming brake drums

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999312A (en) * 1955-12-29 1961-09-12 Smith Corp A O Flange reinforced embossment
US3055104A (en) * 1955-11-07 1962-09-25 Lyon Inc Method of preparing steel blanks for drawing
US3075068A (en) * 1958-07-22 1963-01-22 Douglas Aircraft Co Inc Sheet metal shrinker
US3188930A (en) * 1962-10-29 1965-06-15 Eastman Kodak Co Simulated lens mount
US3398667A (en) * 1964-08-21 1968-08-27 Agfa Gevaert Ag Shutter for photographic cameras
US5600991A (en) * 1995-02-10 1997-02-11 Ogihara America Corporation Stretch controlled forming mechanism and method for forming multiple gauge welded blanks
US20090255317A1 (en) * 2008-04-11 2009-10-15 Thyssenkrupp Steel Ag Method for the production of high-precision half shells with high dimensional precision
US20180050380A1 (en) * 2015-03-13 2018-02-22 Benteler Automobiltechnik Gmbh Method for producing a shaped sheet metal part having wall thicknesses differing from each other by region, and axle subframe

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3055104A (en) * 1955-11-07 1962-09-25 Lyon Inc Method of preparing steel blanks for drawing
US2999312A (en) * 1955-12-29 1961-09-12 Smith Corp A O Flange reinforced embossment
US3075068A (en) * 1958-07-22 1963-01-22 Douglas Aircraft Co Inc Sheet metal shrinker
US3188930A (en) * 1962-10-29 1965-06-15 Eastman Kodak Co Simulated lens mount
US3398667A (en) * 1964-08-21 1968-08-27 Agfa Gevaert Ag Shutter for photographic cameras
US5600991A (en) * 1995-02-10 1997-02-11 Ogihara America Corporation Stretch controlled forming mechanism and method for forming multiple gauge welded blanks
US20090255317A1 (en) * 2008-04-11 2009-10-15 Thyssenkrupp Steel Ag Method for the production of high-precision half shells with high dimensional precision
US8240184B2 (en) * 2008-04-11 2012-08-14 Thyssenkrupp Steel Ag Method for producing high-precision half shells
US20180050380A1 (en) * 2015-03-13 2018-02-22 Benteler Automobiltechnik Gmbh Method for producing a shaped sheet metal part having wall thicknesses differing from each other by region, and axle subframe
US10226809B2 (en) * 2015-03-13 2019-03-12 Benteler Automobiltechnik Gmbh Method for producing a shaped sheet metal part having wall thicknesses differing from each other by region, and axle subframe

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