B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1113
B29C 43/20 (2006.01) B22F 3/02 (2006.01) B22F 5/00 (2006.01) B22F 7/06 (2006.01) B29C 43/14 (2006.01) B30B 11/02 (2006.01) B32B 1/00 (2006.01) B29C 43/00 (2006.01) B29C 43/36 (2006.01)
Patent
CA 1315939
Abstract of the Disclosure The invention concerns a method for the manufacture of a rivet for a fixed spike or for a sleeve-mounted spike, respectively, by pressing in a mould. In the method of the invention, the cavity space in the mould , corresponding to the shape of the spike to be manufac- tured, is first filled to the desired extent with a first material to form the body part of the spike. Hereupon a first punch , whose diameter is substantially smaller than the diameter of the cavity space in the mould, is fitted into the cavity space con- centrically with the cavity space, and the annular space between said first punch and the cavity space is filled with a second material so as to form the wear-resistant surface layer for the spike. Next, the first punch is removed, and the space remaining after said punch is filled with a third material. Ultimately the spike is pressed to the desired shape and density, whereinafter the spike is removed from the mould. The invention also concerns equip- ment for carrying out the method.
610481
Marks & Clerk
Neste Oy
Suvanto Erkki
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