Sectional push boring machining process for camshaft mounting holes

A processing technology and camshaft technology, which is applied in the field of mechanical processing, can solve the problems that the stroke of the machine tool cannot meet the requirements, the installation hole of the camshaft is long, and the intermediate support tool bar cannot be used, so as to solve the problem of difficult machining and ensure the effect of precision

Active Publication Date: 2012-09-19
NO 70 INST OF CHINA NORTH IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Sectional push boring machining process for camshaft mounting holes
  • Sectional push boring machining process for camshaft mounting holes
  • Sectional push boring machining process for camshaft mounting holes

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Embodiment Construction

[0021] specific implementation

[0022] The technical solutions implemented will be described in detail below in conjunction with the accompanying drawings.

[0023] A machining process for segmented push boring of a camshaft mounting hole, which comprises the following steps:

[0024] ① Rough and semi-finishing where the camshaft mounting hole is a rough hole: The alignment pin holes on the surface of the camshaft support body coincide with the positioning datum during finishing machining, and two holes with the same diameter are bored out at the left and right ends of the camshaft support body. hole;

[0025] ②Finish boring of the two leftmost bearing holes: The positioning of the positioning pin holes on the camshaft support surface in step ① coincides with the positioning datum during finishing, and fine boring of the two leftmost bearing holes;

[0026] ③Install the guide tool rod: After boring the two bearing holes in step ②, loosen the tool rod and the tool handle, ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B35/00
Inventor 王好赵敏建董春荣建国
Owner NO 70 INST OF CHINA NORTH IND GRP
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