Manufacturing method of pedestal bearing for turbocharger and positioning tool for same

Abstract

The invention discloses a manufacturing method of a pedestal bearing for a turbocharger and a positioning tool for the same. The manufacturing method comprises the following machining procedures of: 1), roughly turning one end surface and a hole of a workpiece; 2), roughly turning the other end surface and an outer circle of the workpiece; 3), annealing the workpiece to remove stress; 4), carrying out finish turning on the end surface and the hole; 5), carrying out the finish turning on the other end surface and the hole; 6), milling a semicircular positioning groove; 7), drilling radial holes at two ends; 8), milling the flat and square parts of the outer circle; 9), removing burrs by a bench worker; 12), milling an oil applying wedge surface of a thrust surface; 13), carrying out flaw detection; 14), removing the burrs by the bench worker and cleaning a part; and 15), carrying out comprehensive detection. The procedure 3) is adopted between the procedure 2) and the procedure 4) to anneal the workpiece to remove the stress; a procedure 10) and a procedure 11) are adopted between the procedure 9) and the procedure 12); the procedure 10) comprises the following steps of: adopting the positioning tool, positioning the outer circle of the workpiece by utilizing a tool hole, compacting the thrust surface of the workpiece, and accurately grinding the holes; and the procedure 11) comprises the following steps of: positioning the holes by utilizing a taper shaft, and accurately grinding the outer circle and the thrust surface. The manufacturing method and the positioning tool have the advantages that the procedures are arranged reasonably, and the machining quality and the machining efficiency can be effectively improved.

Description

technical field [0001] The invention relates to a manufacturing method of a supporting bearing and a positioning tool thereof, in particular to a manufacturing method of a turbocharger supporting bearing and a positioning tool thereof. Background technique [0002] There are 15 processes in the existing turbocharger support bearing manufacturing method, which are: (1) casting annealing to relieve stress; (2) rough turning end face and hole; (3) rough turning the other end face and outer circle; 4) Finish turning end face and hole; (5) Finish turning the other end face and outer circle; (6) Milling semicircle positioning groove; (7) Drilling radial holes at both ends; (8) Milling outer circle flat square; (9) Deburring by the fitter; (10) hard three-jaw clamp outer circle, fine grinding hole and thrust surface; (11) positioning hole with tapered mandrel, fine grinding outer circle; (12) milling oil wedge surface on thrust surface; (13) Flaw detection inspection; (14) fitter ...

AI Technical Summary

Problems solved by technology

[0003] Although the turbocharger support bearing can be manufactured according to the above-mentioned manufacturing method, there are the following disadvantages in the above-mentioned method of manufacturing the turbocharger support bearing: 1, in the process (2) and (3), it is easy to produce machining after the rough turning of the workpiece stress, the processing stress must be eliminated, but the workpiece is stress-relieved in process (1), which only eliminates the stress of the workpiece, but cannot eliminate the processing stress. For high-precision parts, there are still defects of deformation

[0004] 2. When the hole and thrust surface are finely ground in process (10), hard three jaws are used. If the clamping force is too large, the parts will be deformed, and the roundness of the finely ground holes is seriously out of tolerance, causing the parts to be scrapped.

[0005] 3. After process (11) uses the deformed hole in process (10) to position and process the outer circle, the roundness of the outer circle is seriously out of tolerance and scrapped, which not only increases the processing cost, but also increases the processing cycle and seriously reduces the production efficiency

[0008] In the above process, although the soft three jaws can overcome the deformation of the part after clamping the part during the processing, it still has the following shortcomings: 1. In the process (2) and (3), the workpiece is rough It is easy to produce processing stress after turning, and the processing stress must be eliminated, but the workpiece is subjected to stress relief treatment in process (1), which only eliminates the stress of the workpiece, but cannot eliminate the processing stress. For high-precision parts, there is still deformation defect

[0009] 2. The outer circle is clamped by soft three claws, but there is still deformation, and the roundness of the parts cannot be fully guaranteed.

[0010] 3. Since the radial holes at both ends are drilled in the process (7), the turning in the process (10) is intermittent cutting, and small protrusions will appear on the edge of the radial holes, resulting in the workpiece still not meeting the roundness requirements

[0011] 4. In order to eliminate the small protrusions in the inner hole processed by the process (10), it is necessary to add the process (11) to scrape the inner hole, but this will cause the inner hole to fail to meet the roundness requirements after scraping the inner hole

[0012] 5. In the process (10), the finishing hole is used for processing. Due to the comparison between finishing turning and grinding, the roughness accuracy is low and cannot meet the requirements of the workpiece. Finally, the roughness requirement can only be achieved by polishing the hole, but the overall circle of the hole The degree cannot be guaranteed, causing the workpiece to be scrapped

[0013] 6. The thrust surface is turned, and the roughness cannot reach Ra0.8

[0014] 7. The hole size tolerance of turning control level 6 precision is not easy to guarantee without grinding

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