Production method for welded cylinder block of marine diesel engine

Abstract

The invention discloses a production method for a welded cylinder block of a marine diesel engine. The welded cylinder block comprises a scavenging device and a cylinder block box of a welded structure. The cylinder block box comprises a baseplate, a plurality of first transverse webs, a plurality of second transverse webs, a plurality of middle partitions, a first side palate, a second side plate, a plurality of triangular tube plates and a face plate. The production method includes step 1, scribing lines on a platform; step 2, assembling the cylinder block box; step 3, assembling the triangular tube plates; step 4, assembling the scavenging device. Technological measures such as control of scribing and mounting errors and proper shrinkage allowance are adopted, so that quality of the welded cylinder block is improved.

Description

technical field [0001] The invention relates to the processing of diesel engine components, in particular to a method for manufacturing a welded cylinder block of a marine diesel engine, which belongs to the technical field of diesel engines. Background technique [0002] The structure of the marine diesel engine cylinder block is usually a combination of the cylinder block and the scavenging manifold. At present, the cylinder block is generally produced by casting process, because the casting process of the cylinder block is easy to produce defects such as cold cracks, and it is not easy to weld and repair. Welding repair is also very difficult, and there is often color difference in the welding repair area, so the casting blank of the cylinder block has a certain scrap rate, resulting in an increase in production cost. In addition, the casting also has defects such as large machining dust. [0003] Recently, a welded cylinder block has appeared, and its biggest feature is ...

AI Technical Summary

Problems solved by technology

However, the structure of the welded cylinder block becomes complicated, and the welding requirements are also high. The key points and difficulties of its manufacture are:

[0004] 1. The thickness of the panel 16 of the welded cylinder block is 225mm, which is an ultra-thick steel plate, which is the key to the uniform shrinkage and deformation of the overall structure, and the quality of the welds of the parts connected to it is high, all of which meet the requirements of EN601M Q3 and are polished The arc R transition is required, so the welding process is more difficult

[0005] 2. The thickness of the triangular tube plate 17 in the cylinder body box 1 is 16mm. Because it adopts single-sided welding and double-sided molding, it must have high assembly accuracy, and the assembly gap is 3±0.5mm to ensure the welding quality of the weld seam Reliable, thus increasing the difficulty of manufacturing and assembling components

[0006] 3. Due to the large difference in plate thickness of each component, there is a large welding stress in the processed structure, which has a great impact on the fatigue life of the weld

[0007] 4. Most of the scavenging device is a cylinder with a plate thickness of about 10mm, which is easy to deform during welding, so strict requirements are put forward for controlling the shrinkage allowance of assembly and welding

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