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Bearing seat inner hole abrasion remanufacturing spray repair method

A repair method and bearing seat technology, which are applied in coating, fusion spraying, metal material coating process, etc., can solve the problems of large shrinkage rate of spray coating and high repair cost, and improve mechanical matching and physical compatibility. , strong versatility, solve the effect of easy wear and tear

Active Publication Date: 2017-11-03
济宁拓源精密机械股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problems of high mechanical repair cost of bearing seat wear and large shrinkage rate of spray coating in the prior art, the present invention provides a method for remanufacturing and spraying repair of bearing seat inner hole wear

Method used

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  • Bearing seat inner hole abrasion remanufacturing spray repair method
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  • Bearing seat inner hole abrasion remanufacturing spray repair method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The wear remanufacturing and spraying repair method of the inner hole of the bearing seat in this embodiment is applied to the repair of the inner hole of the large and medium-sized bearing seat, and the steps are as follows:

[0064] Step 1. Surface pretreatment of the inner hole of the bearing seat:

[0065] A. Remove oil stains and oil stains on the surface of the inner hole of the bearing seat;

[0066] B. Grinding the fatigue layer of the inner hole of the bearing seat;

[0067] C. Clean the surface to be sprayed with detergent;

[0068] D. The inner hole of the bearing seat is roughened before spraying to improve the adhesion of the coating;

[0069] Step 2. Preheating before spraying: place the bearing seat in the preheating device for preheating treatment to eliminate moisture and humidity on the surface to be sprayed, increase the interface temperature between the sprayed particles and the workpiece, and reduce the thermal expansion caused by the workpiece. ...

Embodiment 2

[0079] The basic steps of the method for remanufacturing and spraying the wear of the inner hole of the bearing housing in this embodiment are the same as those in Embodiment 1. The difference and improvement are that in step D of the first step, 24# special emery for thermal spraying is used for roughening treatment. The final surface roughness is Ra6~8; in step 2, the preheating temperature is controlled at 80°C; in step 3, use NiA1 material as the base, and its thickness is 0.08mm, which can eliminate the wear-resistant working layer and the inner hole of the bearing seat. The problem of thermal expansion coefficient mismatch between the base layer is to reduce the thermal stress caused by the mismatch between the expansion coefficient of the working layer and the base layer of the inner hole of the bearing seat, and improve the mechanical matching and physical compatibility between the working layer and the base layer of the inner hole of the bearing seat The working layer ...

Embodiment 3

[0085] The basic steps of the bearing seat inner hole wear remanufacturing and spraying repair method in this embodiment are the same as those in Embodiment 2, the difference and improvement are: in step D of the first step, the roughening treatment is carried out with 24# special emery for thermal spraying, and the coarsening The final surface roughness is Ra8; in step 2, the preheating temperature is controlled at 90°C; in step 3, use NiA1 material as the primer, and its thickness is 0.1mm; the working layer uses NiCr-Cr 3 C 2 Composite coating with a thickness of 0.50mm. NiCr alloy has excellent heat resistance, corrosion resistance, high temperature oxidation resistance and other properties, and also plays the role of bonding phase. Cr 3 C 2 It has good high-temperature hardness and high-temperature oxidation resistance, and acts as a hard phase. In the coating, it also mainly plays the role of dispersion strengthening of the second phase particles, which can solve the ex...

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Abstract

The invention discloses a bearing seat inner hole abrasion remanufacturing spray repair method and belongs to the technical field of bearing seat repair. Through the steps of bearing seat inner hole surface pretreatment, preheating before spraying, spray material preparation, supersonic spraying and coating processing, a NiCr or NiAl material is selected for spray material priming, the problem that the material thermal expansion coefficients of an abrasion-resistant working layer and a bearing seat inner hole basic layer are not matched can be solved, thus, the thermal stress caused by mismatching of the expansion coefficients of the working layer and the bearing seat inner hole basic layer is reduced, and mechanical matching and physical compatibility of the working layer and the bearing seat inner hole basic layer are improved; and a WC-12Co composite coating or a NiCr-Cr3C2 composite coating is used as the working layer. Through repair step optimization, multicomponent alloy coating compositions and distribution, the good erosive abrasion resistance is achieved, and the problems of high mechanical repair cost of bearing seat abrasion and large shrinkage percentage of spraying coatings are solved.

Description

technical field [0001] The invention relates to the technical field of repairing of bearing seats, in particular to a method for remanufacturing and spraying the inner hole of the bearing seat for wear and repair. Background technique [0002] Wear is one of the three main causes of failure of metal parts (wear, corrosion and fatigue). The economic loss it causes is very huge, such as the figure announced by the United States in 1981, the annual loss due to wear and tear is as high as 100 billion US dollars. Among them, the material consumption is about 20 billion US dollars, which is equivalent to 7% of the annual output of materials. Due to the poor wear resistance of materials, the lost life of a large number of basic parts in my country is generally much lower than that of foreign advanced products, so the direct and indirect economic losses are also very alarming. According to the incomplete statistics of the five industrial sectors of metallurgy, mining, agricultural...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C4/08C23C4/129C23C4/02C23C4/18B23P6/00
CPCB23P6/00C23C4/02C23C4/06C23C4/08C23C4/129C23C4/18
Inventor 凤国保李志忠
Owner 济宁拓源精密机械股份有限公司
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