Universal type pitch circle positioning gear mill inner hole device

Abstract

The invention discloses a universal type pitch circle positioning gear mill inner hole device. The universal type pitch circle positioning gear mill inner hole device comprises a pitch circle clamp body, a roller locating ring and a roller, wherein the inner wall of the pitch circle clamp body and the bottom surface form a cavity for accommodating a gear; the inner wall comprises a plurality of curved surfaces; the path line of the curved surfaces is a curved line of which the curvature radius is decreased by degrees; the roller locating ring is arranged at the bottom of the pitch circle clamp body, and can rotate in a certain range at the bottom of the clamp body; the roller comprises a column core and an outer ring which is sleeved outside the column core; the inner diameter of the outer ring is greater than the diameter of the column core; and the column core is fixed on the roller locating ring. According to the universal type pitch circle positioning gear mill inner hole device, the roller is meshed with a gear pitch circle, the curved surfaces of the inner wall of the pitch circle clamp body are used for positioning in a matching mode, and the gear is rotated clockwise to finish positioning and clamping, and is rotated counterclockwise to finish dismounting, so that the clamping efficiency is very high; and the clamping direction of the gear is in accordance with the grinding direction of a grinding machine to ensure that the gear can not become loosened during grinding, so that the stability of the product quality is ensured.

Description

technical field [0001] The invention relates to a gear grinding inner hole fixture, in particular to a universal pitch circle positioning gear grinding inner hole device. Background technique [0002] There are many types of supporting gears for coal shearers, and the requirements for dimensional accuracy are high. At the same time, the machining process of the gear is long, and the machining accuracy of the previous process often has a greater impact on the machining accuracy of the subsequent process. If the final process of the gear is gear grinding, the gear end face and inner hole are usually used for positioning during the gear grinding process. The inner hole of the gear is used as the positioning reference of the gear grinding process, and the coaxiality tolerance of the inner hole of the gear after grinding the inner hole is required to be no more than 0.014mm. [0003] At present, in this process, the gears are usually clamped manually by a pressure plate or a fo...

AI Technical Summary

Problems solved by technology

[0003] At present, in this process, the gears are usually clamped manually by a pressure plate or a four-jaw chuck. This clamping method has the following two problems: (1) Difficulty in quality control: due to the lack of necessary special positioning fixtures, during the clamping process , it is necessary to repeatedly correct the indexing circle and the end face, the positioning accuracy of the part is subject to the subjective influence of the operator, and lacks stability; (2) Low clamping efficiency: because the tooling fixture is too simple, the runout accuracy of the end face needs to be recalibrated every time the gear is replaced and the indexing circle runout accuracy, the clamping efficiency is low. Taking a certain type of gear in the company as an example, the clamping time of the four-jaw chuck is about 45 minutes, and the clamping time of each gear is about 20 minutes, accounting for 10% of the total working hours of a single piece. 1 / 3 or more

In the process of grinding the inner hole and the end face, the pitch circle fixture is also used to clamp the gear, but after the barrel type pitch circle is clamped, the fixture will block the end face of the gear and cannot process the inner hole and the end face at the same time. Ordinary pitch circle fixtures usually use steel balls to contact the gear tooth surface, but the centering effect of multi-point contact is poor, and the precision is low. The point contact method makes the steel ball bear greater pressure and wear, which is likely to cause wear failure and affect the processing accuracy of the product.

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