A scribing method for a V-type diesel engine frame blank

Abstract

The invention relates to a marking method for a V-shaped diesel engine rack blank. The rack blank is provided with a plurality of coaxial main bearing holes longitudinally distributed in the center of the lower portion, two rows of parallel cylinder sleeve holes and two rows of guide cylinder holes, wherein the two rows of cylinder sleeve holes are symmetrically formed in the two sides of the top, and a 30-degree included angle is formed between the axes of the two rows of cylinder sleeve holes and the central line of a rack. The marking method is characterized in that under the premise that the machining allowance is ensured, the central lines of all the cylinder sleeve holes, the guide cylinder holes, camshaft holes and the main bearing holes, hole round machining lines, rack outline contour machining lines and the machining lines of the two end faces of the rack are marked through five marking positions on a horizontal worktable based on equilateral triangle three-dimensional space operation, wherein all the machining lines meet the design dimension requirements. According to the marking method, conventional marking tools and special single-foot clamping tools are used, the equilateral triangle three-dimensional space operation of the V-shaped rack is achieved at the five marking positions, and the advantages of lowing the production cost and avoiding quality accidents are achieved; the marking method has the advantages that operation is easy and convenient, and the marking precision is high; the marking method is suitable for marking operation of any V-shaped integrated rack and similar parts.

Description

technical field [0001] The invention relates to a manufacturing process of large diesel engine parts, in particular to a scribing method for a V-type diesel engine frame blank, and belongs to the technical field of diesel engine manufacturing. Background technique [0002] The frame is an important part of the diesel engine. It bears the pressure of the cylinder block and plays the role of guiding the piston, connecting rod and crankshaft in the working process. see figure 1 , on the frame of the medium-sized V-type diesel engine, there are several coaxial main bearing holes 11 distributed longitudinally in the center of the lower part; The positions where the frame center line OO' forms an included angle of 30° are symmetrically arranged on both sides of the top of the frame, and the center points A and B of the cylinder liner holes and the center point O of the main bearing hole on both sides form the vertices of an equilateral triangle Sixteen pairs of guide cylinder ho...

AI Technical Summary

Problems solved by technology

Such a scribing method has the disadvantages of cumbersome process, heavy workload of turning over the blank body, high labor intensity and high safety risk.

Images