公开(公告)号：DE1933483A1

公开(公告)日：1970-02-05

申请号：DE1933483

申请日：1969-07-02

Applicant: PRESS UND STANZWERK AG

Inventor： ROLF WE HMUELLER ,  GREINER PAUL ,  XANDER FRANZ

IPC: B21J5/06 ,  B21K21/04 ,  C21D9/16 ,  F42B5/28 ,  B21D51/54

Abstract: 1,263,938. Making cartridge cases; upsetting. WERKZEUGMASCHINEN-FABRIK OERLIKON-BUHRLE A.G. 11 July, 1969 [12 July, 1968; 16 July, 1968 (2)], No. 35107/69. Headings B3A and B3H. [Also in Division F3] A cartridge case is made by cold upsetting a blank sheared from a bar stock, backward extruding the blank and axially pressing the cupped article formed to shape the base of the case in one pressing. The degree of upsetting is selected so that any defects in the blank become visible as surface cracks. The defective blanks are sorted out either visually, mechanically, electrically or pneumatically. The bar stock is steel with a carbon content of below 0À3%, preferably 0À16 to 0À25%. The cupped article is heat treated to restore the strain-hardening property to the steel. The heat treatment comprises heating the article to above the A3 transformation point, holding this temperature for 1 to 5 minutes and rapidly cooling at 50‹ to 100‹ C. per minute. The heating may be induction or by a gas or oil furnace. This treatment prevents the formation of coarse grains particularly between the base and side walls of the case.

公开(公告)号：DE1933488A1

公开(公告)日：1970-01-15

申请号：DE1933488

申请日：1969-07-02

Applicant: PRESS UND STANZWERK AG

Inventor： WEYMUELLER ROLF ,  XANDER FRANZ

IPC: B21D51/54

Abstract: 1,261,766. Drawing. WERKZEUGMASCHINENFABRIK OERLIKON-BUHRLE A.G. 11 July, 1969 [12 July, 1968], No. 35106/69. Heading B3Q. An apparatus for drawing and calibrating a cartridge case 16 comprises a necking die 1 movable in a bushing 2, a spindle 10 for calibrating the mouth of the case 16 and an ejector 8 movable relative to the spindle 10. The cartridge case 16 is pushed by a ram 17 into the die 1 which is moved against the action of springs 7 to abut a member 6 and which tapers the mouth of the case 16. When the ram 17 is withdrawn, the die 1 is moved by the springs 7 until the drawn mouth is applied against a gauging die portion 12 of the spindle 10. The ejector 8 is then moved to cause its head 9 to force the mouth of the case 16 over the die portion 12. The rearward movement of the die 1 is limited by a collar 3 of the bushing 2. During the further forward movement of the ejector 8, pawls 14 are forced radially outwards against spring force 18 by the ejector surface 15 to cause release of the spindle 10 which can then travel together with the ejector 8.