Manufacturing method for rack of marine low-speed diesel engine

Abstract

The invention discloses a manufacturing method for a rack of a marine low-speed diesel engine. The manufacturing method comprises the following steps that firstly, the rack is divided into a rack head segment module, a rack middle segment module and a rack tail segment module, wherein the rack middle segment module comprises a plurality of rack middle segments which are the same in structure and size; secondly, according to the design size of the rack, all part plates of all the rack segments are cut for blanking, then grooves are processed and welded, and finally the plates are stored in a classified mode; thirdly, a CO2 welding method is adopted for welding the rack head segment module, the rack middle segment module and the rack tail segment module step by step respectively; fourthly, the rack head segment module, the rack middle segment module and the rack tail segment module are jointed and folded; and fifthly, annealing treatment is finally conducted on connection weld joints to reduce residual stress produced by welding of connection areas, and after overall heat treatment on the rack is completed, aging treatment and flaw detection are conducted to make the rack reach all design standards. The manufacturing method has the advantages of being high in production efficiency and good in interchangeability and universality.

Description

technical field [0001] The invention belongs to the technical field of diesel engines, and in particular relates to a manufacturing method for modular welding and integral splicing of a frame of a large marine low-speed diesel engine. Background technique [0002] As an important part of the diesel engine, the frame plays an important role in supporting the cylinder block and forming the crankcase with the machine base. The performance of the frame directly affects the reliability of the diesel engine. The document with the patent number ZL02145176.1 discloses a welding method for the frame of a low-speed diesel engine, mainly through a series of positioning holes, positioning iron pipes, and complicated devices such as straps and tire frames to complete the overall welding of the frame , but this method is cumbersome to operate and the consistency of the manufactured rack is poor. The document with the patent number ZL201010530701.8 discloses an automatic welding system fo...

AI Technical Summary

Problems solved by technology

The document with the patent number ZL02145176.1 discloses a welding method for the frame of a low-speed diesel engine, mainly through a series of positioning holes, positioning iron pipes, and complicated devices such as straps and tire frames to complete the overall welding of the frame , but this method is cumbersome to operate and the consistency of the manufactured rack is poor

The document with the patent number ZL201010530701.8 discloses an automatic welding system for the frame frame of a marine diesel engine. The automatic welding method using real-time tracking welding replaces the traditional manual semi-automatic welding mode. This method realizes automation in the welding mode improvement, but lack of a certain welding strategy, low production efficiency and product interchangeability

[0003] The current known technology has the following defects: (1) the welding process is complicated, the efficiency is not high, the consistency between the same batch of racks is not good, and it is not suitable for mass production

(2) There is no structural modularization between the main modules of the rack, lack of interchangeability and versatility, local defects are likely to cause overall scrapping, and the manufacturing cost is high

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