| 摘要 |
PURPOSE:To form an wear resistant layer in the smallest possible thickness and to reduce weight, by packing a wire rod for build up brazing between a cylindrical jig and a cylinder body, and melting and solidifying the same to Al-Si eutectic structure. CONSTITUTION:A cylinder body is cast of an Al alloy having good machinability, and the inside surface thereof is roughly finished by machining. A wire rod 17 for build up welding is wound on the outside circumference in the cylindrical part 15a of a jig for build-up brazing, whereafter the jig is inserted into the cylinder body in such a way that the rod 17 inscribe the cylinder body and that a flange 3 on a crank case side and a flange part 15b of the jig for build up brazing fit to each other. A masking sealant 18 is coated in the clearance between the flange 3 and the part 15b and the clearance between the flange 2 and a backing jig 16. The assembly is charged into a heating furnace and is heated for a prescribed time. The wire rod 17 melts to form a build-up brazed layer of Al-Si eutectic structure. The inside surface of the build-up brazed layer is subjected to finish working. |
