Clamp device for machining large-sized thin-walled impeller and finish machining method of large-sized thin-walled impeller

Abstract

The invention discloses a fixture device for machining large-scale thin-walled impellers and a finishing method for large-scale thin-walled impellers. The fixture device includes a bottom plate, and the working surface of the bottom plate is provided with a first recess and a second recess. The circular surface fits, and the second concave part cooperates with the second circular surface of the impeller end. The edge of the first concave part is provided with a first pressing part for pressing the impeller wall, and the center of the second concave part is detachably provided with a The second circular surface is locked to the second pressing part of the bottom plate. In the present invention, the first circular surface at the end of the impeller is positioned by setting the first recess, and the impeller is locked to the bottom plate through the first pressing part without welding. The fixing is convenient and fast. After the first round of machining of the impeller, the second concave part is set to position the second circular surface of the impeller, and the second pressing part is used to fasten the impeller to realize sequential machining of the impeller. Avoid the situation that some surfaces are not processed due to fixtures or other reasons, and improve the surface accuracy of the impeller.

Description

technical field [0001] The invention relates to the field of impeller processing, in particular to a fixture device for machining large-scale thin-walled impellers and a finishing method for large-scale thin-walled impellers. Background technique [0002] Centrifugal compressors or centrifugal pumps are used to provide pressurization for various fluid flows. This type of compressor or centrifugal pump contains an impeller. When the impeller rotates, the fluid enters in the axial direction, and then accelerates into the circumferential and radial directions. The high-velocity fluid enters the diffuser, and the high-pressure fluid is output after the speed is converted. For this type For compressors or centrifugal pumps, the impellers used are generally large thin-walled alloy precision casting impellers. No matter what kind of impeller, after casting or manufacturing, it is necessary to machine the impeller such as turning, heat treatment, and high-speed test before it can b...

AI Technical Summary

Problems solved by technology

[0003] 1) Since the impeller wall is relatively thin, especially for large thin-walled closed impellers, the thinnest part is less than 1.2mm, direct clamping is easy to cause deformation and rupture, causing damage to the impeller, which will not only further bring troubles for subsequent machining Difficulty, and in most cases, after the impeller is damaged, the impeller will be scrapped, which greatly increases the production cost;

[0004] 2) Due to the complexity of the clamping tool, more surfaces on the impeller have not been machined, which greatly reduces the precision of turning;

[0005] 3) The impeller is directly set on the impeller support base plate, without an effective positioning of the impeller, it is prone to radial deviation, so it is easy to cause cracks on the surface of the impeller due to vibration during the turning process, and at the same time, there are large Potential safety hazards, further reducing processing accuracy;

[0006] 4) Fixtures for processing cannot play a role in fast positioning, so more time is wasted for clamping and alignment

[0008] 6) The impeller is a casting, the overall surface roughness is poor, the positioning is not accurate, the efficiency of fixed alignment is low, the machining accuracy is reduced during turning, and it is easy to deform the workpiece, resulting in low yield

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