The processing steps of the impeller are as follows:

There are mainly three procedure during the Impeller processing:

Process 1

According to the principle that the impeller processing must be aligned with the flow channel, the clamping method of the three-jaw self-centering chuck is used to back up the impeller inlet flow channel to realize alignment with the inlet flow channel, then the large outer circle of the impeller is turned first, and then the inner hole is rough-turned . Due to the relatively large size of the outer circle of the impeller, the blades in the middle part form intermittent cutting, so the cutting speed is slow and the feed rate is small.

Process 2

In order to ensure that the flow channel of the impeller outlet is used as the processing reference, we have designed a special three-jaw clamping and positioning mechanism. The positioning block is conical, and under the action of the spring force, it can ensure that it is in contact with both sides of the impeller flow channel and can move up and down, so as to compensate for the error of the width dimension of the flow channel of the impeller outlet during the casting process. This positioning mechanism has high positioning accuracy, high speed, and is convenient to use, which greatly shortens the time for clamping and alignment. This process can complete all the processing of the center hole and other parts of the impeller back cover.

Process 3

In order to ensure the beating requirements of the outer diameter of the impeller inlet to the hole. This process adopts special soft three-jaw clamping. Before processing, use three claws to clamp a cylinder to correct the inner hole and bottom surface of the clamping part of the soft claw. The diameter after processing should be basically the same as the outer diameter of the impeller, which is very important. Because the plane thread accuracy of the three-jaw self-centering chuck that determines the positioning accuracy of the chuck is not very high, the positioning accuracy of the three-jaw itself cannot meet the design requirements of the shape and position tolerance of the impeller. Therefore, it must be based on the size of the impeller diameter. Correct the clamping position of the soft jaw so that the clamping position of the soft jaw coincides with the center of rotation of the lathe. If the specifications of the processing impeller are changed and the outer diameter changes greatly, it should be re-calibrated, so as to avoid affecting the clamping and positioning accuracy of the chuck due to the change of the working part of the chuck's plane thread. When the impeller is clamped, the machined back cover plane of the impeller should be close to the bottom surface of the calibrated soft claw, so that the machining can ensure the shape and position tolerance of the impeller. 

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