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Technique for preventing defects of surfacing wear-resistant layer of part

A process method and wear-resistant layer technology, applied in manufacturing tools, welding equipment, arc welding equipment, etc., can solve the problems affecting the smooth delivery of products, lengthening the production cycle, poor welding processability, etc., to avoid unfused defects and reduce repairs. The number of times, the effect of improving the quality

Inactive Publication Date: 2015-01-28
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor welding process of aluminum bronze surfacing, after finishing, defects such as unfused layers, pores, slag inclusions and "bright spots" often occur
It is necessary to repair the welding or remove the original copper layer and re-surfacing, these problems will lengthen the production cycle, increase the cost, and seriously affect the smooth delivery of products

Method used

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  • Technique for preventing defects of surfacing wear-resistant layer of part
  • Technique for preventing defects of surfacing wear-resistant layer of part
  • Technique for preventing defects of surfacing wear-resistant layer of part

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with embodiment.

[0030] The present invention comprises the following steps:

[0031] 1) see figure 1 , the shape of the piston parts is roughed, and the parts with cylindrical boss structure are obtained, see figure 2 , an annular groove is provided on the large end cylindrical surface of the part along the circumferential direction, the cross section of the annular groove is an inverted isosceles trapezoid, and the bottom chamfer of the annular groove is 133°~137°;

[0032] 2) Surfacing the nickel-based superalloy auxiliary layer in the annular groove of the part in step 1), the material of the nickel-based superalloy auxiliary layer is GH536, the parts need to be cleaned before welding, and the surface to be welded is dipped in acetone Wipe with absorbent cotton to remove grease, and air dry, heat the parts to 150-200°C during welding, see image 3 , using cross-symmetrical welding, using DC a...

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Abstract

The invention discloses a technique for preventing defects of a surfacing wear-resistant layer of a part. By the technique, the surfacing quality of parts such as pistons is improved, the number of rework is reduced, the one-step delivery-check qualified rate of the parts is improved, and the production cost is reduced. According to the technical scheme, the technique comprises the following steps of (1) roughly turning outlines of a piston part to obtain a part with a cylindrical boss structure and forming an annular groove with the inverted-isosceles-trapezoid-shaped section in a cambered surface of a large end of the part; (2) surfacing a nickel-base superalloy auxiliary layer in the annular groove, performing crossing symmetrical welding, transversely welding the annular groove along the axial direction, sequentially welding the annular groove until surfacing on the whole annular groove of the part is finished and machining the auxiliary layer; (3) surfacing an aluminum bronze layer on the auxiliary layer and performing crossing symmetric welding; and (4) sequentially performing destressing treatment and finish machining on the piston part after the piston part is subjected to surfacing so as to obtain a finished product of a piston.

Description

technical field [0001] The invention belongs to the field of mechanical manufacturing, and in particular relates to a process method for preventing defects of wear-resistant layers of overlay welding of parts. Background technique [0002] In order to improve the service life of high-power naval parts, it is necessary to surfacing materials such as aluminum bronze on the surface of power piston parts with stainless steel substrates to increase the wear resistance and corrosion resistance of the parts. Due to the poor welding process of aluminum bronze surfacing, after finishing, defects such as unfused layers, pores, slag inclusions and "bright spots" often occur. It is necessary to repair welding or remove the original copper layer and re-surfacing. These problems will lengthen the production cycle, increase the cost, and seriously affect the smooth delivery of products. Contents of the invention [0003] In order to solve the problems in the prior art, the present inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/167B23K9/235
CPCB23K9/04B23K9/167B23K9/235
Inventor 杨桢李金声杨峰陈金平罗鹏袁轶
Owner AECC AVIATION POWER CO LTD
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