Machining device and machining method of forming hole

Abstract

The invention provides a machining device and method of a forming hole. The machining device comprises a grinding wheel (4) and a grinding wheel rod (5), wherein the grinding wheel (4) is fixedly connected with a grinding wheel mounting part (52) at one end of the grinding wheel rod (5); a grinding wheel mounting hole (41) in the grinding wheel (4) is in interference fit with the grinding wheel mounting part (52) on the grinding wheel rod (5); the other end of the grinding wheel rod (5) is provided with a grinding wheel rod clamping part (51); the axial width of the grinding wheel (4) is smaller than the axial width of the forming hole; the diameter tolerance of the grinding wheel mounting hole (41) is 0-0.01 mm; and the diameter tolerance of the grinding wheel mounting part (52) is 0.01-0.02. When the machining device is used for grinding the forming hole, the machining of the forming hole by a longitudinal reciprocating and transverse feeding grinding mode can be realized, so that a lot of grinding wheel finishing time and grinding tool setting time are saved, and the machining productivity of the forming hole is greatly improved.

Description

technical field [0001] The invention relates to the technical field of machining of cemented carbide parts, in particular to a processing device and a processing method for a forming hole on a cemented carbide part. Background technique [0002] like figure 1 The forming hole 2 on the hard alloy machined part 1 shown has high dimensional accuracy and high positional accuracy, the width dimension h3±0.02, the diameter of the forming hole 2 φd2±0.02, and the angle of the taper surface of the port part of the forming hole 2 requires A °±0.3°, and the distances h1 and h2 between the two end faces of the forming hole 2 and the two end faces of the adjacent processed part 1 are 0.02 apart. [0003] In order to process the above-mentioned forming holes, most of the existing processing methods adopt the cutting and grinding mode of the forming grinding wheel, that is, after the forming grinding wheel is inserted into the through hole on the processed part, the grinding wheel only p...

AI Technical Summary

Problems solved by technology

[0005] First, during processing, the height consistency of the processed parts is required to be high, and the dimensional consistency must be within ±0.01, otherwise, the distance between the two ends of the processed forming hole and the end faces of the adjacent processed parts will be The size difference between h1 and h2 exceeds the process range, resulting in defective processing;

[0006] Second, when the forming hole is wider, the grinding wheel used also needs to be widened accordingly. During grinding, as the width of the grinding wheel increases, the grinding force also increases, which easily causes the deformation of the grinding wheel rod. It is difficult to ensure that the diameter of the forming hole Φd2 is qualified; and in order to reduce the grinding force, the feed speed needs to be controlled very small, which in turn leads to low processing efficiency of the forming hole

[0007] Third, for the grinding of cemented carbide parts, diamond grinding wheels are used, but for the dressing of diamond grinding wheels, it is impossible to directly dress with a diamond pen, and only the way of dressing outside the machine can be used.

For forming holes with such high precision, during processing, the grinding wheel needs to be trimmed every time 5 parts are processed. Each time the grinding wheel is trimmed, the grinding wheel must be removed together with the grinding wheel rod. When replacing the grinding wheel, due to the different length and width of the grinding wheel, It is very time-consuming and labor-intensive to re-set the tool after trimming, and the processing efficiency is very low

Images