| 摘要 |
Pairs of bearing sections of a crankshaft, each pair comprising a line bearing and an adjacent stroke bearing are machined consecutively starting with a pair close to one end of the crankshaft and proceeding pair by pair towards the other end of the crankshaft. In this operation the section of the crankshaft located between the pair in cutting engagement with the tools and the other end of the crankshaft is left radially upsupported and freely to undergo any deformation that may result from the removal of stock by the tools, whereas the other section of the crankshaft including the pair of bearings machined in the preceding operation is held by engagement with suitable clamping means. As a result of this method any deformation of the character just explained is eliminated by the subsequent machining operation and the end product is free from any deformation. Therefore, it is no longer necessary, as heretofore, to subject the crankshaft after the roughing operation to a truing and finishing operation prior to the heat treatment and the grinding operation. |
