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Method for remedying water-eroded defects on finished surface of engine cylinder block

An engine cylinder and surface machining technology is applied in the field of repairing water erosion defects on the machined surface of an engine cylinder block, which can solve the problems of unreliable repair methods, difficulty in remanufacturing the engine cylinder block, and the like, and achieves dense tissue without defects and a small thermal action zone. , to ensure the effect of dimensional accuracy

Active Publication Date: 2015-04-15
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for repairing water erosion defects on the machined surface of engine cylinder blocks, so as to solve the unreliable repair method for existing water erosion defects on the machined surface of engine cylinder blocks, which makes it difficult to realize the repair of engine cylinders with water erosion defects. Technical issues of body remanufacturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Repair the water erosion defect of the upper plane water hole of the engine cylinder block. The upper plane water hole is the machined surface on the engine cylinder block. The repair process of corresponding defects on other machined surfaces is the same, which includes the following steps:

[0037] (1) According to the shape of the defective part, use a steel wire wheel to grind the surface of the defective part, remove the surface oxide layer, oil stains and other factors that are not conducive to the combination of the welding material and the cylinder body in the subsequent welding process, and expose the cylinder body ;

[0038] (2) Grind the sharp corners or edges on the cylinder body with a steel wire wheel, so that the sharp corners or edges on the cylinder body can achieve a smooth transition, and avoid poor bonding in the subsequent welding process;

[0039] (3) Apply alcohol to the defective part after grinding and ignite it to remove the oil immersed in the...

Embodiment 2

[0047] Repair the water erosion defect of the upper plane water hole of the engine cylinder block. The upper plane water hole is the machined surface on the engine cylinder block. The repair process of corresponding defects on other machined surfaces is the same, which includes the following steps:

[0048] (1) According to the shape of the defective part, use a pneumatic grinding wheel dresser to grind the surface of the defective part to remove the oxide layer, oil stains and other factors that are not conducive to the combination of the welding material and the cylinder body in the subsequent welding process, and expose the defective part. Cylinder block body;

[0049] (2) Use a pneumatic grinding wheel dresser to grind the sharp corners or edges on the cylinder body, so that the sharp corners or edges on the cylinder body can achieve a smooth transition, and avoid poor bonding in the subsequent welding process;

[0050] (3) Apply alcohol to the defective part after grinding ...

Embodiment 3

[0058] Repair the water erosion defect of the water jacket plugging hole of the engine cylinder block. The water jacket plugging hole is the blank surface on the engine cylinder block. The corresponding defect repair process of other blank surfaces is the same, which includes the following steps:

[0059] (1) According to the shape of the defective part, use steel wire wheel, pneumatic grinding wheel dresser or other suitable grinding tools to grind the surface of the defective part to remove the oxide layer and oil stains on the surface of the defective part, which are not conducive to the subsequent welding process. The combination of the material and the cylinder body exposes the cylinder body;

[0060] (2) Use wire wheel, pneumatic grinding wheel dresser or other suitable grinding tools to grind the sharp corners or edges on the cylinder body, so that the sharp corners or edges on the cylinder body can achieve a smooth transition, Avoid poor bonding in the subsequent weldi...

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Abstract

The invention discloses a method for remedying water-eroded defects on the finished surface of an engine cylinder block and belongs to the technical field of engine cylinder block refabrication. The method includes: polishing the defective surface to expose a cylinder block body; polishing sharp corners or edges on the cylinder block body; removing oil at defective positions; re-polishing; cleaning the defective positions; remedying the defective positions by electric spark ionic microwelding to make the welded positions level to the finished surface of the cylinder block; polishing the welded positions to make the welded positions lower than the finished surface of the cylinder block; remedying the welded positions by pulse cold welding to make the welded positions higher than the finished surface of the cylinder block; and polishing the welded positions to make the welded positions level to the finished surface of the cylinder block. The method effectively guarantees fine bonding of welding material and substrate during welding. The electric spark ionic microwelding is reasonably combined with the pulse cold welding, so that efficiency is increased and the remedied texture is kept dense and non-defective.

Description

technical field [0001] The invention belongs to the technical field of engine cylinder block remanufacturing, and in particular relates to a method for repairing water erosion defects on the machined surface of an engine cylinder block. Background technique [0002] Remanufacturing is an industry that implements high-tech repair and transformation of waste products. It is aimed at damaged or about to be scrapped parts. On the basis of performance failure analysis, life evaluation and other analysis, remanufacturing engineering design is carried out. Technology to restore the shape and precision of the workpiece, so that the quality of remanufactured products can reach or exceed that of new products. [0003] Engine cylinder block water erosion is a common defect in the old engine cylinder block, and it generally exists on the upper plane of the engine cylinder block, the corresponding position of the plugging hole of the water jacket cavity, and other surfaces in contact wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/02
Inventor 韩继胜王圣斌张兰春丁韬杨生明孙占昌
Owner WEICHAI POWER CO LTD
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