US2332175A - Method of forming brake drums - Google Patents

Method of forming brake drums Download PDF

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Publication number
US2332175A
US2332175A US402407A US40240741A US2332175A US 2332175 A US2332175 A US 2332175A US 402407 A US402407 A US 402407A US 40240741 A US40240741 A US 40240741A US 2332175 A US2332175 A US 2332175A
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United States
Prior art keywords
blank
web
annular
annular wall
brake drums
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US402407A
Inventor
Charles W Sinclair
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
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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.)
Filing date
Publication date
Application filed by Kelsey Hayes Co filed Critical Kelsey Hayes Co
Priority to US402407A priority Critical patent/US2332175A/en
Application granted granted Critical
Publication of US2332175A publication Critical patent/US2332175A/en
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Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to the manufacture of brake drums and refers more particularly to the method of forming brake drums from sheet metal of uniform gauge.
  • the invention has for one object to provide an improved method of forming a brake drum having a web of less thickness than the annular brake flange.
  • the invention has for another object to so form the brake drum that the steps in the method may be economically carried out.
  • Figure 1 is a side elevation of a flat circular sheet metal blank of uniform gauge from which the brake drum is to be formed;
  • Figures 2, 3, 4 and are sectional views illustratin successive steps in the manufacture
  • Figure 6 is a sectional view illustrating the completed brake drum
  • Figure '7 is an elevation thereof
  • Figure 8 is a cross section on the line 88 of Figure 7.
  • a flat circular sheet metal blank I shown in Figure 1
  • the blank is formed of a suitable steel and has a sufficient thickness to form the annular brake flange of the completed brake drum.
  • the blank I is subjected to a die-pressing step to form the bowled blank 2, shown in Figur 2.
  • the blank 2 has the Web 3 and the annular wall 4, the web being convex and extending axially beyond the annular wall.
  • the web has the flat central portion 5 and the frusto-conical outer portion 6 which is connected to the annular wall by a gradual curve.
  • the annular wall has the inner cylindrical portion I and the outer flared portion 8 which is gradually curved.
  • the blank is then subjected to a die-pressing step to depress the central portion of the web while maintaining the annular wall substantially unchanged, the blank ID of Figure 3 being formed.
  • the central portion l l of the Web is hat and located axially within the unchanged annular wall of the blank and the outer portion I2 of the web is frusto-conical and connects into the cylindrical portion of the annular wall by a returnbent gradual curve.
  • the previously formed central hole allows the metal of the web to move radially outwardly so that noticeable thinning of the web is avoided.
  • the central hole I3 of larger diameter than the central hole 9 is formed in the central portion I I, preferably by a punch, the hole [3 being shown in Figure 3.
  • the next step comprises forming and flanging the blank by necting at its inner edge into the annular flange l1 and located axially within the cylindrical portion I5, the substantially axially extending annular portion 20 connecting into the outer edge of the central portion l9, and the frustoconical outer portion 2
  • the hole I8 is of larger diameter than the hole I3 and the outer portion 2
  • the next step comprises reducing the thickness of the web by machining the same to produce the blank 22, illustrated in Figure 5, the cylindrical portion and annular flange of the annular wall remaining unchanged.
  • metal is removed from the outside faces of the flat central portion and the frusto-conical outer portion and also from inside the axial flange and the substantially axially extending annular portion connecting the central and outer portions.
  • the metal at the inner end of the cylindrical portion of the annular wall is preferably retained to reinforce the junction between the cylindrical portion and the frusto-conical outer portion of the web.
  • the next die-pressing step comprises ribbing and restriking the blank 22 to produce the blank 23, illustrated in Figures 6, 7 and 8.
  • the cylindrical portion I5 of the annular wall and the radially extending annular reinforcing flange It at the outer or free end of the cylindrical portion are maintained substantially unchanged.
  • the portions of the web, with the exception of the central axially extending flange 24, are radially ribbed at 25, the ribs being formed by depressing the metal toward the outer or free end of the cylindrical portion I5.
  • the method of forming a brake drum comprising the successive steps of die-pressing a flat circular sheet metal blank of uniform gauge to shape the same into a bowled blank having an annular wall and a Web, punching the web of the bowled blank to form a central hole therethrough, die-pressing the punched bowled blank to depress the central portion of the web axially within the annular wall while maintaining the annular wall 10 substantially unchanged, die-pressing the resulting blank to shape a portion of the annular wall into a cylindrical portion and to shape the central depressed portion of the web into a generally axially extending annular flang and a generally radially extending flat portion connecting into the annular flange, then machining the web to reduce the thickness thereof, and "finally die- CHARLES W. SINCLAIR.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Braking Arrangements (AREA)

Description

Oct. 19, 1943. c. w. SINCLAIR METHOD OF FORMING BRAKE DRUMS Filed July 14, 1941 2 Sheets-Sheet l INVENTOR.
CHARLES W. SINCLAIR BY I TTORIVEYS Oct. 19, 1943. c. w. SINCLAIR 2,332,175
METHOD OF FORMING BRAKE DRUMS Filed July 14, 1941 2 Sheets-Sheet 2 INVENTOR. CHARLES W. SINCLAIR ATTORNEYS Patented Oct. 19, 1943 METHOD OF FORMING BRAKE DRUMS Charles W. Sinclair, Detroit, Mich., assignor to Kelsey-Hayes Wheel Company, Detroit, Mich,
a corporation of Delaware Application July 14, 1941, Serial No. 402,407
1 Claim.
The invention relates to the manufacture of brake drums and refers more particularly to the method of forming brake drums from sheet metal of uniform gauge.
The invention has for one object to provide an improved method of forming a brake drum having a web of less thickness than the annular brake flange.
The invention has for another object to so form the brake drum that the steps in the method may be economically carried out.
These as well as other objects of the invention will become apparent from the following description, taken in connection with the accompanying drawings, in which Figure 1 is a side elevation of a flat circular sheet metal blank of uniform gauge from which the brake drum is to be formed;
Figures 2, 3, 4 and are sectional views illustratin successive steps in the manufacture;
Figure 6 is a sectional view illustrating the completed brake drum;
Figure '7 is an elevation thereof;
Figure 8 is a cross section on the line 88 of Figure 7.
In my method of forming brake drums, a flat circular sheet metal blank I, shown in Figure 1, is used. The blank is formed of a suitable steel and has a sufficient thickness to form the annular brake flange of the completed brake drum. The blank I is subjected to a die-pressing step to form the bowled blank 2, shown in Figur 2. The blank 2 has the Web 3 and the annular wall 4, the web being convex and extending axially beyond the annular wall. The web has the flat central portion 5 and the frusto-conical outer portion 6 which is connected to the annular wall by a gradual curve. The annular wall has the inner cylindrical portion I and the outer flared portion 8 which is gradually curved. After the bowling step has been completed the central hole 9 is formed in the central portion 5 preferably by a punch, the hole also being shown in Figure 2.
The blank is then subjected to a die-pressing step to depress the central portion of the web while maintaining the annular wall substantially unchanged, the blank ID of Figure 3 being formed. The central portion l l of the Web is hat and located axially within the unchanged annular wall of the blank and the outer portion I2 of the web is frusto-conical and connects into the cylindrical portion of the annular wall by a returnbent gradual curve. During this step, the previously formed central hole allows the metal of the web to move radially outwardly so that noticeable thinning of the web is avoided. After the depressing step the central hole I3 of larger diameter than the central hole 9 is formed in the central portion I I, preferably by a punch, the hole [3 being shown in Figure 3. The next step comprises forming and flanging the blank by necting at its inner edge into the annular flange l1 and located axially within the cylindrical portion I5, the substantially axially extending annular portion 20 connecting into the outer edge of the central portion l9, and the frustoconical outer portion 2| connecting into the annular portion 20 and the cylindrical portion I5. The hole I8 is of larger diameter than the hole I3 and the outer portion 2| is convex.
The next step comprises reducing the thickness of the web by machining the same to produce the blank 22, illustrated in Figure 5, the cylindrical portion and annular flange of the annular wall remaining unchanged. During the machining, metal is removed from the outside faces of the flat central portion and the frusto-conical outer portion and also from inside the axial flange and the substantially axially extending annular portion connecting the central and outer portions. The metal at the inner end of the cylindrical portion of the annular wall is preferably retained to reinforce the junction between the cylindrical portion and the frusto-conical outer portion of the web.
The next die-pressing step comprises ribbing and restriking the blank 22 to produce the blank 23, illustrated in Figures 6, 7 and 8. During this die-pressing step the cylindrical portion I5 of the annular wall and the radially extending annular reinforcing flange It at the outer or free end of the cylindrical portion are maintained substantially unchanged. However, the portions of the web, with the exception of the central axially extending flange 24, are radially ribbed at 25, the ribs being formed by depressing the metal toward the outer or free end of the cylindrical portion I5.
What I claim as my invention is:
The method of forming a brake drum comprising the successive steps of die-pressing a flat circular sheet metal blank of uniform gauge to shape the same into a bowled blank having an annular wall and a Web, punching the web of the bowled blank to form a central hole therethrough, die-pressing the punched bowled blank to depress the central portion of the web axially within the annular wall while maintaining the annular wall 10 substantially unchanged, die-pressing the resulting blank to shape a portion of the annular wall into a cylindrical portion and to shape the central depressed portion of the web into a generally axially extending annular flang and a generally radially extending flat portion connecting into the annular flange, then machining the web to reduce the thickness thereof, and "finally die- CHARLES W. SINCLAIR.
US402407A 1941-07-14 1941-07-14 Method of forming brake drums Expired - Lifetime US2332175A (en)

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US402407A US2332175A (en) 1941-07-14 1941-07-14 Method of forming brake drums

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US2332175A true US2332175A (en) 1943-10-19

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158285A (en) * 1962-10-31 1964-11-24 Continental Can Co Welded bail ear with segmented flange
US3219225A (en) * 1963-05-21 1965-11-23 Mcdowell Mfg Co Multi-part cathode-ray cone
US3285050A (en) * 1962-05-16 1966-11-15 Borg Warner Method of forming a clutch cover plate
US3291413A (en) * 1963-12-19 1966-12-13 Philip S Cushing Cap for paper core
US3335595A (en) * 1964-12-30 1967-08-15 Borg Warner Cover plate for friction device
US4109600A (en) * 1975-11-13 1978-08-29 Post Willem P Process for applying a threaded seat in a metal plate
US5709313A (en) * 1995-06-22 1998-01-20 E & H Investments Drum outlet construction
US20030189371A1 (en) * 2001-10-02 2003-10-09 Collins Cecil A. Side plate with integral boss

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285050A (en) * 1962-05-16 1966-11-15 Borg Warner Method of forming a clutch cover plate
US3158285A (en) * 1962-10-31 1964-11-24 Continental Can Co Welded bail ear with segmented flange
US3219225A (en) * 1963-05-21 1965-11-23 Mcdowell Mfg Co Multi-part cathode-ray cone
US3291413A (en) * 1963-12-19 1966-12-13 Philip S Cushing Cap for paper core
US3335595A (en) * 1964-12-30 1967-08-15 Borg Warner Cover plate for friction device
US4109600A (en) * 1975-11-13 1978-08-29 Post Willem P Process for applying a threaded seat in a metal plate
US5709313A (en) * 1995-06-22 1998-01-20 E & H Investments Drum outlet construction
US20030189371A1 (en) * 2001-10-02 2003-10-09 Collins Cecil A. Side plate with integral boss
US7165812B2 (en) * 2001-10-02 2007-01-23 Fisher Dynamics Corporation Side plate with integral boss

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