It is often encountered in machining. If the positioning reference selection is unreasonable, it will affect the precision of the machined parts and bring great difficulty to the production. What I am most impressed with is the feeling of the fourth stage of the high-pressure steam engine in the manufacturing process. 1. Part structure analysis The machined part is the fourth stage wheel of the core machine rotor, which is connected by vacuum welding and other wheel plates, which is very important. Therefore, the maximum outer diameter of the part is φ426.3mm (see Figure 1), and the minimum wall thickness is 1.5mm. It is a ring with a thin wall and a drum.
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