Method for scribing integral cylinder block blanks of large diesel engines

Abstract

The invention discloses a method for scribing integral cylinder block blanks of large diesel engines. A plurality of groups of coaxial cylinder liner blank holes and gland blank holes are formed in each cylinder block blank. The method is characterized in that three-dimensional space scribing tasks are completed in a two-dimensional scribing mode on the premise that machining allowance is guaranteed, and center lines of various cylinder liner holes and gland holes and position lines of reference end surfaces of the various cylinder liner holes and the gland holes can be scribed by the aid of two scribing positions of each cylinder block blank on a scribing platform, and meet dimensional requirements. The method is combined with an existing scribing technology, so that stereoscopic scribing operation can be implemented on each cylinder block at the two corresponding scribing positions by the aid of conventional scribing tools, effects of reducing the production cost and preventing safety and quality accidents can be realized, and the method has the advantages of simplicity and convenience in operation and high scribing precision, and is applicable to scribing operation on optional integral cylinder blocks and similar large castings.

Description

technical field [0001] The invention relates to a manufacturing process method for large diesel engine parts, in particular to a marking method for a large diesel engine integral cylinder block blank, and belongs to the technical field of diesel engine manufacturing. Background technique [0002] The cylinder block is an important main part of a diesel engine. It is equipped with a cylinder head, a cylinder liner and a cooling water channel for cooling the cylinder liner and cylinder head. It also cannot allow fuel to leak into the crankcase of the fuselage. The overall parts of the large diesel engine cylinder block are bulky and heavy, which brings great difficulties to the processing. The casting blank of the integral cylinder block of a large diesel engine generally needs to go through a scribing process before machining. The scribing method and the formed line shape and line quality have a significant impact on the quality, cycle and turnover of machining. [0003] se...

AI Technical Summary

Problems solved by technology

[0005] The first type of scribing method has the advantage of high scribing accuracy, but also because the center of gravity of the cylinder block blank is too high in the second scribing upright position, there is a great safety hazard, and the end plate cannot bear the weight of the cylinder block. This leads to the problem of cracks in the cylinder block at the support of the jack 3; the disadvantage of the second type of marking method is that the actual size and design of the cylinder liner hole 1, the gland hole 2, and the end face D cannot be checked in the first time. There are major quality risks due to size errors

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