Sectional push boring machining process for camshaft mounting holes

Abstract

The invention relates to a sectional push boring machining process for camshaft mounting holes. The process comprises the following steps of: (1) performing rough machining and semi finish machining on the camshaft mounting holes which are blank holes; (2) performing fine boring on two bearing holes at the leftmost end; (3) arranging a guide cutter bar; (4) boring two holes in the middle; (5) arranging an extension bar; and (6) boring the last two holes. By the process, the accuracy, coaxiality and cylindricity of the camshaft mounting holes can be ensured, and the problem that deep and long coaxial bearing holes in a camshaft supporting body are difficult to machine is solved; and the process is particularly suitable for the conditions that a special tool for supporting cannot be arranged in the middle, and the travel of a machine tool or the size of parts is limited.

Description

[0001] technical field [0002] The invention belongs to the technical field of mechanical processing, and in particular relates to a processing method for segmented push boring of a camshaft mounting hole. Background technique [0003] The engine camshaft support body is one of the key parts of the engine. The camshaft mounting hole on it is a high-precision long bearing hole, and the camshaft rotates at a high speed on the camshaft mounting hole. Therefore, the accuracy, coaxiality, and cylindricity of the camshaft mounting hole are very high, which has become a difficult point in the processing of the camshaft support body. [0004] Generally, engine processing factories use special machines (or special tooling) to process such holes. The principle is to process the tool rod through both ends and the middle support. Due to the limitation of the internal space on some parts, there is no place to install the middle support tool holder, so the special machine (or special t...

AI Technical Summary

Problems solved by technology

Due to the limitation of the internal space on some parts, there is no place to install the middle support tool holder, so the special machine (or special tooling) with the middle support tool holder cannot be used for the processing of such parts

If the method of push boring is adopted, the first hole is bored first, and then the second hole is bored with this hole as a guide and support, and so on, other holes are bored, but due to the long installation hole of the camshaft or the limitation of the shape of the part or The stroke of the machine tool does not meet the requirements

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