Manufacturing method of welding type cylinder block of marine diesel engine

A technology of marine diesel engine and manufacturing method, which is applied in welding equipment, welding equipment, auxiliary welding equipment and other directions, can solve the problems of the influence of fatigue life of welding seam, large plate thickness drop, large welding stress, etc., and achieves easy repair and reduction of defects The effect of cold cracking and reducing production and processing costs

Inactive Publication Date: 2014-01-15
HUDONG HEAVY MACHINERY
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Problems solved by technology

[0007] 3. Due to the large difference in plate thickness, there is a large welding stress in the structure, which has a great impact on the fatigue life of the weld
[0008] 4. Most of the scavenging device is a cylinder with a plate thickness of about 10mm, which is easy to deform during welding, and the shrinkage allowance for assembly and welding must be strictly controlled

Method used

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  • Manufacturing method of welding type cylinder block of marine diesel engine
  • Manufacturing method of welding type cylinder block of marine diesel engine
  • Manufacturing method of welding type cylinder block of marine diesel engine

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Embodiment Construction

[0032] The manufacturing method of the welded cylinder block of the marine diesel engine of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention cannot be limited by this.

[0033] Step 1. Platform marking

[0034] 1.1. Before marking the line, the levelness of the platform should be checked first (to ensure that the width of the platform is within 6 meters and the length of 12 meters, the levelness error is ≤ 2mm,), because the levelness of the platform will directly affect the verticality of the parts and the bottom and panel machining allowance.

[0035] 1.2 Determine the datum plane for assembling the cylinder block on the platform, that is, take the bottom plate of the cylinder block as the datum plane, and then determine the installation marking line of the cylinder block on the platform, see figure 1 : Longitudinal centerline, transverse centerlin...

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Abstract

The invention discloses a manufacturing method of a welding type cylinder block of a marine diesel engine. The method comprises the steps of (1) drawing lines on a platform, (2) assembling a box body of the cylinder block, (3) assembling a triangular tube plate, and (4) assembling a scavenging device. According to the manufacturing method of the welding type cylinder block of the marine diesel engine, production cost is reduced; due to the fact that the structure of the welding type cylinder block is a combination of a cylinder block body and a scavenging collecting pipe, the machining amount of the cylinder block and the scavenging pipe is greatly reduced, the workload for secondary assembly is greatly reduced, assembly errors are reduced, the defect that cold cracks appear easily during casting is overcome, defect repairing is easy, and the discarding rate of cylinder blocks is reduced.

Description

technical field [0001] The invention relates to the technical field of cylinder blocks of marine diesel engines, in particular to a method for manufacturing welded cylinder blocks of marine diesel engines. Background technique [0002] Cylinder blocks of marine diesel engines are all produced by casting in China at present. Because defects such as cold cracks are easy to occur during the production process, it is not easy to weld repair, and there is color difference in the weld repair area. Even welding repair is very difficult, and there is a certain scrap rate. The processing dust is relatively large, resulting in an increase in production costs. [0003] The welded cylinder block is the latest design form of MAN B&W, which has a complex structure and high welding requirements. The biggest feature Compared with casting, the welded cylinder block can reduce the weight by 1 / 3, which can greatly reduce the production cost of the cylinder block. [0004] The structure of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02
CPCB23K31/02B23K37/00
Inventor 周磊朱正祥张杰
Owner HUDONG HEAVY MACHINERY
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