Using a four-jaw chuck to find a machining crankshaft is laborious and time-consuming, and the work efficiency is low. Therefore, we have made a set of centering fixtures for machining crankshaft lathes. After years of use, the effect is better, and the work efficiency can be improved by more than 2 times, which not only ensures the processing quality but also improves the production efficiency. The centering fixture structure is shown in the figure. The top 1 is made of 20Cr steel and is carburized and quenched to a hardness of
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