Machining method for connecting parts of segmented machine frames of marine diesel engine

Abstract

The invention discloses a machining method for connecting parts of segmented machine frames of a marine diesel engine. The method comprises the following steps that (1) three coordinate axis referencelines, a machine frame center line and allowance lines are correspondingly scribed in the front-segment machine frame and the rear-segment machine frame; (2) the front-segment machine frame and the rear-segment machine frame are inversely placed and placed on a lathe with connecting surfaces facing a gantry, and the connecting surfaces are machined; (3) the front-segment machine frame and the rear-segment machine frame are placed with the bottom downwards, the connecting surfaces face each other, the front-segment machine frame is close to a table board X-, the rear-segment machine frame is close to a table board X+, and positioning pin holes of the front-segment connecting surface and the rear-segment connecting surface are machined; (4) the front-segment machine frame is not moved, therear-segment machine frame is close to the front-segment machine frame, positioning and close-fitting pins are installed, the segments are connected into a whole, and front-segment inclined door framepart and rear-segment inclined door frame part are machined; and (5) by means of a plano milling machine table board line, a positioning groove, a positioning supporting fastening backer, center reference transfer cutter setting block calibration setting and inclined plane reference transfer cutter setting block calibration setting, all-axis turning errors of accessories are eliminated, the workpiece shape and position tolerance is guaranteed, and machining is completed with the combination of coordinate rotation and coordinate offset. The method is simple in operation, efficient and accurate, achieves the beneficial effect of guaranteeing the shape and position tolerance of the connecting parts of the segmented machine frames, and is suitable for machining of the diesel engine segmentedmachine frames and similar segmented parts on a numerical control plano milling machine.

Description

technical field [0001] The invention relates to the processing of diesel engine parts, in particular to a processing method for a segmented frame connection part of a marine diesel engine, and belongs to the technical field of diesel engine manufacturing. Background technique [0002] There are two types of marine diesel engine frames: integral type and segmented type, and segmented type is mostly used for super-large models. Most of the joints of segmented racks are frame structures with thin steel plates, weak rigidity, and difficult processing; mainly there are processing deformation, difficult control of shape and position differences, gaps in the joint parts after splicing, and cracks on the bottom plane and sides. Problems such as dislocation steps, misalignment of positioning pin holes and difficulty in installation. If the above problems are not controlled, oil leakage will occur after the marine diesel engine is assembled, which will lead to problems such as repair...

AI Technical Summary

Problems solved by technology

Most of the joints of segmented racks are frame structures with thin steel plates, weak rigidity, and difficult processing; mainly there are processing deformation, difficult control of shape and position differences, gaps in the joint parts after splicing, and cracks on the bottom plane and sides. Problems such as misaligned steps, misaligned positioning pin holes, and difficult installation

If the above problems are not controlled, oil leakage will occur after the marine diesel engine is assembled, which will lead to problems such as rework and increase the amount of repetitive labor for workers.

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