Hole grinding fixture

Abstract

The invention discloses a hole grinding fixture, which comprises an expansion core and a Mohs hardness handle, wherein the expansion core is a taper expansion core, the expansion core is sheathed on one end of a grinder spindle, the Mohs hardness handle is matched with an inner taper hole of the grinder spindle, and a backstop pin is arranged between the expansion core and the Mohs hardness handle. The hole grinding fixture, provided by the invention, has the advantages of being short in correction time, saving a large amount of correction time, being sable in quality, high in production efficiency, firm in the fixture, protecting precision of the grinder and saving the fixture.

Description

Technical field [0001] The invention relates to a hole grinding fixture. Background technique [0002] Gearbox gears on light trucks require grinding on both the inner end surface and the tapered surface, and the axial size of the inner end surface, the axial position of the tapered surface and the runout requirements are quite high. In the process of development and trial production, ordinary grinding fixtures are far from being able to meet product requirements in terms of product accuracy and processing efficiency. [0003] In the prior art, this type of grinding fixture is generally tightened with a fixed core expansion sleeve and mounted on a three-jaw chuck. However, this structure has the following shortcomings: (1) Each correction takes a long time: according to product requirements, The runout of the end surface and the tapered surface is 0.015, and the cylindricity of the tapered surface is less than 0.008. Therefore, it is required that the radial jump of the fixed core...

AI Technical Summary

Problems solved by technology

In the process of development and trial production, the ordinary form of grinding fixtures is far from meeting the requirements of the product in terms of product accuracy and processing efficiency.

[0003] In the prior art, this type of grinding jig is generally tightened with a fixed core expansion sleeve and installed on a three-jaw chuck. However, this structure has the following disadvantages: (1) Each calibration takes a long time: according to product requirements, the internal The runout of the end surface and the cone surface is 0.015, and the cylindricity of the cone surface is less than 0.008. Therefore, the radial runout of the fixed core expansion sleeve of the grinding fixture is required to be less than 0.008. Due to the error of the three-jaw chuck itself and the manufacturing error of the fixture, the correction is very abnormal. Difficult, as long as about 2 hours; (2) Unstable quality and low production efficiency: Since each workpiece must be rotated and tightened with a wrench, the fixture is easy to move during the processing, and it is difficult for the operator to find it. I don't know when it moved. At this time, it is necessary to re-calibrate the fixture and re-check the quality of each workpiece in front. Therefore, on the one hand, it brings hidden dangers to the quality and makes the quality unstable. On the other hand, the production efficiency is low and the operation (3) Fixtures are easily damaged: During the calibration process, the three-jaw chuck is often knocked, which not only makes the chuck easily damaged, but also affects the spindle accuracy of the grinder; (4) Inconvenient to replace products: due to the There are many similar products, the batches are not large, and they need to be replaced frequently, so it brings difficulties to production arrangements

Images