GB865581A - Method and apparatus for the cold-extrusion of articles with non-cylindrical bores - Google Patents

Method and apparatus for the cold-extrusion of articles with non-cylindrical bores

Info

Publication number
GB865581A
GB865581A GB12999/57A GB1299957A GB865581A GB 865581 A GB865581 A GB 865581A GB 12999/57 A GB12999/57 A GB 12999/57A GB 1299957 A GB1299957 A GB 1299957A GB 865581 A GB865581 A GB 865581A
Authority
GB
United Kingdom
Prior art keywords
mandrel
die
head
blank
supporting members
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.)
Expired
Application number
GB12999/57A
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
Publication of GB865581A publication Critical patent/GB865581A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/10—Making finned tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)

Abstract

865,581. Extruding. SCHONDELMAIER, C. April 24, 1957 [April 25, 1956], No. 12999/57. Class 83 (4). A hollow metal work-piece with a non- cylindrical bore (including substantially cylindrical bores containing fluting, grooves, and/or lands) is produced by extruding the work-piece through the aperture of an extrusion die of which the inner bore-producing mandrel is freely rotatable with respect to the outer die member, but is located axially relative thereto. A prebored blank 6 is inserted into the upper portion 5a of a channel in a die member 5 and a grooved mandrel 2 is inserted into the bore of the blank so as to project a short distance through the blank. A ram adapted to be moved relative to the die 5 comprises a cylindrical hollow head 1 having a bottom 1a (Fig. 1) from which a tubular ram member 1b projects for insertion into the upper portion 5a of the die-channel to exert a coldmoulding pressure upon the blank 6. The mandrel 2 is supported in and guided by the inner wall of the tubular ram member and has supporting members 3, 4 secured at one end to its head, the mandrel and supporting members extending through apertures 1c, 1d, 1e, respectively, in the bottom 1a of the ram head. These supporting members engage with the upper surface of the die-member 5 to limit the movement of the mandrel into the die channel to a point where its lower end extends slightly beyond the level of the lower end of the conical portion 5c. The blank and mandrel are free to turn relative to each other about the same axis and for this purpose the supporting members 3, 4 are provided at their upper ends with bearing-means which rotatably support the head of the mandrel. These bearing means may either consist of suitable anti-friction bearings or the supporting members may be provided with semi-circular head portions which engage in an annular groove 2c in the head of the mandrel and thus form a pair of slide bearings.
GB12999/57A 1956-04-25 1957-04-24 Method and apparatus for the cold-extrusion of articles with non-cylindrical bores Expired GB865581A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE865581X 1956-04-25

Publications (1)

Publication Number Publication Date
GB865581A true GB865581A (en) 1961-04-19

Family

ID=6801868

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12999/57A Expired GB865581A (en) 1956-04-25 1957-04-24 Method and apparatus for the cold-extrusion of articles with non-cylindrical bores

Country Status (1)

Country Link
GB (1) GB865581A (en)

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