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Process method for preventing sand inclusion in through bolt hole of marine diesel engine

A marine diesel engine and through-bolt technology, which is applied in the field of marine diesel engines, can solve problems such as welding spatter, high welder skill requirements, and low efficiency, and achieve the effect of avoiding risks

Active Publication Date: 2018-11-30
中船发动机有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires high welder skills and low efficiency. At the same time, there will be welding spatter on the back side if there is a gap. If the penetration weld is poorly formed, sand inclusions will be generated at the weld toes on both sides. The Danger of Huawa

Method used

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  • Process method for preventing sand inclusion in through bolt hole of marine diesel engine
  • Process method for preventing sand inclusion in through bolt hole of marine diesel engine
  • Process method for preventing sand inclusion in through bolt hole of marine diesel engine

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] A process method for preventing sand inclusion in a through-bolt hole of a marine diesel engine, comprising the following steps:

[0037] Step 1: Perform sandblasting pretreatment on the surfaces of triangular plate 04, wing plate 03, and guide rail plate 02; before sandblasting pretreatment, use ISO 8502-4Elcometer319 dew point meter to detect the ambient humidity and substrate temperature, and the humidity is less than 85 %, the substrate temperature is at least 3°C ​​higher than the dew point;

[0038] Step 2: Weld the guide rail plate 02 and the wing plate 03, and then weld the two ends of the triangular plate 04 to the guide rail plate 02 and the wing plate 03 respectively. When welding, make the end of the triangular plate 04 close to the wing plate 03. After the welding is completed , clean up the welding slag and dirt at each welding ang...

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Abstract

The invention discloses a method for preventing sand inclusion in a through bolt hole of a marine diesel engine. The process method includes the following steps: the first step of conducting sandblasting processing on the surfaces of a triangular plate, a wing plate and a guide rail plate; the second step of welding the guide rail plate and the wing plate and then welding two ends of the triangular plate respectively to the guide rail plate and the wing plate; the third step of installing a protective baffle at the angle between the triangular plate and the wing plate; the fourth step of performing overall sandblasting processing on the through bolt hole where the protective baffle is installed; the fifth step of removing the protective baffle and a baffle jacking plate after the overall blasting is completed and cleaning the area protected by the protective baffle to remove surface rust and loose deposits; the sixth step of conducting overall painting on the through bolt hole. The protective baffle is arranged in the angle area of the triangular plate and the wing plate during overall sandblasting, sand inclusion in the angle area is avoided during sandblasting clearing, and the risk of the whole machine tiling is avoided.

Description

technical field [0001] The invention relates to the technical field of marine diesel engines, in particular to a process method for preventing sand inclusion in through bolt holes of marine diesel engines. Background technique [0002] The through bolt hole 01 in the frame of the MAN two-stroke diesel engine is surrounded by the guide rail plate 02, the wing plate 03 and the triangular plate 04, such as Figure 1-2 As shown, sanding and painting are required in the area of ​​the triangular through-bolt hole 01, and the angle between the triangle plate 04 and the wing plate 03 is 25°. Into the corner, it is difficult to clean out. When the main engine is running, the frame is under dynamic load, and the steel sand at the included angle may fall off due to the vibration of the main engine, and enter the main bearing kinematic pair with the main lubricating oil, which will cause serious consequences for the tiles. [0003] The existing technical means is to adjust the pairing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 魏宁李忠明李仁民戚佃亮戚明李红卓
Owner 中船发动机有限公司
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