F - Mech Eng,Light,Heat,Weapons – 16 – C
Patent
F - Mech Eng,Light,Heat,Weapons
16
C
64/1, 26/180
F16C 3/02 (2006.01) B21K 1/06 (2006.01) B21K 1/12 (2006.01)
Patent
CA 1190758
ABSTRACT OF THE DISCLOSURE A novel method is provided herein for manufacturing a case-harden- able, rotationally symmetric, hollow shaft, made from at least two shaft parts each of which parts is produced by the method of cold extrusion, the shaft parts being joined with each other by welding in regions of constant shaft diameter is provided herein. It includes the first step of forming the parts destined to be the two opposite shaft end parts by cold extrusion, each part having an axial cavity closed at one end thereof and constituting one of the ends of the hollow space in the shaft. Then any other, inter- mediate shaft part is likewise formed by cold extrusion, at least one of the shaft parts consisting of at least two stepped regions, each being of constant diameter, the diameters of these regions being stepped down toward a closed shaft end, the configuration of the internal wall of the hollow space in the hollow shaft corresponding substantially to the configuration of the outer shaft surface. Then the shaft parts are friction welded to- gether, with the weld between adjacent shaft parts being located in a joint plane, with the cavities of the adjacent shaft parts opening in the joint plane, and the cavity of at least one of the adjacent shaft parts having its largest diameter in the joint plane. In this way, a finished shaft having a continuous hollow space in its interior, sealed at all sides, is obtained. The lightweight shafts manlufactured by this method are easily manufactured and yet have strength properties guaranteeing safe operation. The method is particularly useful for manufacturing shafts, the diameter of which become smaller towards their ends and in which the total material used is not wasted in a substantial amount of wasteful turnings or the like.
389385
Borden Ladner Gervais Llp
Lanz Industrie-Technik Ag
LandOfFree
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