A machining method for camshaft hole of marine diesel engine frame

Abstract

A method for processing a camshaft hole of a marine diesel engine frame. The camshaft hole includes a camshaft hole that is difficult to bore in parallel. One side of the camshaft hole that is difficult to bore in parallel has a normal distance from the adjacent camshaft hole. There is a narrow interval between the adjacent camshaft hole and the boring tool that cannot be entered, and it is characterized in that on the adjacent camshaft hole that has a normal interval with the difficult-to-sequence-boring camshaft hole, the diameter of the hole that does not reach the design size is first sequentially bored. Pre-boring, and then back-boring a step hole that is slightly larger than the pre-boring diameter but still less than the design size, and then use the dial indicator to measure the center deviation between the pre-boring hole and the step hole, and use a boring tool for back-boring The center zero position of the center is corrected, and finally the remaining camshaft hole is back-bored to reach the design size. The invention ensures the coaxiality of the forward boring hole and the reverse boring hole, improves the machining accuracy of the camshaft hole, saves the machining time and improves the machining efficiency.

Description

technical field [0001] The invention relates to the processing of a marine diesel engine, in particular to a processing method for a camshaft hole of a frame of a marine diesel engine, and belongs to the technical field of diesel engines. Background technique [0002] The frame of the in-line medium-speed marine diesel engine has many differences in structure from the V-type medium-speed frame. In the processing of this in-line medium-speed machine type, the processing of the camshaft hole is undoubtedly one of the most difficult difficulties. The total length of the frame is 5730mm (taking a 9-cylinder machine as an example), and there are 11 gear camshaft holes on both sides. The coaxiality between the bearing hole and the camshaft holes on both sides is required to be within 0.10mm, the gear opening in the camshaft hole is small, and the length of the camshaft hole at the fuel cam is longer, about 220mm. [0003] Since the camshaft holes of this model are close to both ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a machining method for the camshaft hole of the frame of a marine diesel engine, by back-boring a shoulder grid on a camshaft hole that has not been bored to size, Afterwards, use the dial indicator to correct, and then finish boring the remaining camshaft holes, so as to solve the problem that the coaxiality cannot be guaranteed, improve the machining accuracy, and reduce the repeated labor of the operator

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