Design special fixture to process high-precision eccentric valve body (figure)
For lathes, there are three main types of difficult-to-machine parts: slender shafts, high-precision eccentric parts, and thin-walled parts. Special fixtures, tools and other auxiliary devices must be used for the above three types of parts, and special machining methods are used to ensure the machining accuracy and surface quality of the parts. Now take the valve body of the oil logging tool as an example to study the turning technology of high-precision eccentric parts.
For general eccentric parts, such as eccentric shafts or parts with one or two eccentric holes, four-jaw single-action or three-jaw self-centering chuck spacers are generally used to achieve machining accuracy requirements. However, for the eccentric hole with high precision requirements on the parts of the turning valve body (see Figure 1), whether it is single-piece small batch production or mass production, it is difficult to meet the processing precision requirements if the general center-finding method is used. Increased the difficulty of processing. Therefore, in order to improve the machining accuracy and machining efficiency of Figure 1, a special lathe fixture for machining the valve body parts has been designed, which has an eccentric indexing rotation function. When processing an eccentric hole, ensure that the center of the eccentric hole and the spindle axis coincide with each other to the highest ideal state, and adjust the balance block to ensure the stability of the workpiece and spindle rotation. The specific design and method of the eccentric indexing slewing fixture are described below.
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