Method for machining diesel engine frame through bolt holes and tools thereof

Abstract

A method for machining diesel engine frame through bolt holes and tools thereof are provided. On a numerical control gantry milling machine, a rough milling tool and a finishing milling tool mounted on a shockproof shank connected to a power accessory are successively adopted to automatically complete rough milling and finishing milling of all the through bolt holes in a frame in a circular arc interpolation method according to a numerical control program command; the connection between the shockproof shank and the power accessory is subjected to interference fit processing, that is, the gap size of the connection surface of the shockproof shank and the power accessory is measured when the shockproof shank is first installed, and an interference fit gasket is customized according to the gap size and fixed on the connection surface of the shockproof shank. According to the method, the tool angle is optimized, the high-efficiency continuous full program control automatic machining is achieved, and the effects of small machining tremor, cutting temperature reduction and smooth chip discharge are achieved. Not only the hole wall machining quality is ensured, but also the machining efficiency is improved. The method is suitable for machining of the diesel engine frame through bolt holes and deep holes.

Description

technical field [0001] The invention relates to metal cutting processing of marine diesel engine parts, in particular to a processing method and cutting tool for diesel engine frame penetrating bolt holes, and belongs to the technical field of diesel engine manufacturing. Background technique [0002] The frame is one of the important parts of the marine diesel engine, please refer to figure 1 , the frame of the multi-cylinder diesel engine is provided with a plurality of through bolt holes F, and there are four through bolt holes F on the position of each cylinder. The bolt hole F is set on the inner triangular plate. The blank of the triangular plate is a solid steel plate. The two sides are welded in the depth below the upper plane of the frame. The distance from the upper plane of the frame is L=650mm, and the thickness of the plate is 30mm. [0003] Traditional hole processing methods are: drilling and boring. However, the traditional method is only applicable to the ...

AI Technical Summary

Problems solved by technology

However, the traditional method is only applicable to the case where the depth is about 3 times the hole diameter, and the depth of the through bolt hole F here is more than 600mm, which is more than 6 times the diameter of the hole. Because the hole is deep and the thickness of the steel plate is thin, the conventional drill bit is useless. In addition, due to the large hole diameter, the diameter of the drill bit is also large, so the drilling force generated is also large, so the steel plate blank is prone to elastic deformation after being stressed. When the drill bit drills through, It will also generate a rebound force to act on the drill blade and the hole wall, resulting in damage to the drill blade and deformation of the hole wall

Due to the large number of through-bolt holes F in the frame and the high tolerance requirements for hole diameter accuracy, it is difficult to guarantee the quality of the hole wall, and more man-hours are required

[0004] In short, the traditional hole processing method has the problems of low processing efficiency, inability to guarantee quality, and high processing cost, and is not suitable for the processing of the diesel engine frame through the bolt hole.

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