A Processing Method of Small Diameter Inclined Hole

Abstract

The invention provides a method for machining a small-diameter inclined hole. The method is used for machining the small-diameter inclined hole with the diameter of 1.58+ / -0.007mm in the lateral wall of a part. The part comprises an annular part body made of titanium alloy, and a lining made of M50 steel is arranged on the inner side of the part body. The method includes the following steps: firstly selecting a 1.47mm high-hardness alloy milling cutter to bury a plane, stopping machining when the machining bottom face of the milling cutter rightly penetrates through the lining, then selecting a 1.5mm alloy bit to drill a hole, wherein the blade length of the bit is 2-4mm larger than the hole depth, selecting a 1.5mm alloy buried bit to correct the drilled hole, and finally selecting a 1.58mm reamer to machine the hole to enable the hole to be in the drawing size. According to the method, the service life of the cutter is prolonged by more than 1.5 times, the size out-of-tolerance rate of the inclined hole is greatly reduced, cutter hitting during machining is avoided, and the time of electro-spark machining caused by cutter hitting is shortened.

Description

technical field [0001] The invention relates to a method for machining a small-diameter oblique hole on the side wall of a part having two different materials on the machining surface, which is suitable for machining a small-diameter precision oblique hole on the inner ring bushing of a bearing housing. hole. Background technique [0002] When machining precision oblique holes on the inner wall of ring-shaped parts such as bearing seats, the aperture size of the oblique holes often cannot meet the requirements, and the tool is often cut, and electric sparks are required to remove the broken tool, and special pins are required. , the processing risk is relatively large, and the processing cost is relatively high, which cannot meet the requirements of mass production. [0003] For example, figure 1 Shown is a schematic cross-sectional processing of a part according to the present invention. The part may be a ring-shaped part of a bearing seat. It can be seen in the figure th...

AI Technical Summary

Problems solved by technology

The applicant found that this processing technology has the following defects: firstly, the selection of cutting tools is unreasonable, and they are basically ordinary alloy cutting tools.

Secondly, if the 1.5mm alloy milling cutter is used to bury the plane, due to the tool gap, the poor control of the processing depth will cause the aperture to be out of tolerance; the 1.5mm alloy drill bit has too large a length-to-diameter ratio and poor rigidity; Too much cutting allowance at the bottom, resulting in knife

Finally, ordinary cutting fluid is used during processing, generally E9010 (Masda), the cooling effect is not good, and the bushing is easy to rust

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