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Laser-arc compound remanufacturing method for TRT bearing cylinder iron castings

A casting and remanufacturing technology, which is applied in the field of repairing TRT iron castings, can solve the problems of increasing the width of the interface brittle zone and whitening tendency, large heat input of arc welding, and obvious diffusion of carbon elements, etc., and achieves low thermal expansion characteristics, The effect of reducing the tendency of cracking and improving the repair quality

Active Publication Date: 2018-05-11
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: First, the heat input of arc welding is too large, which directly leads to serious thermal damage of the substrate, increases the width of the interface brittle zone and the tendency of whitening
Second, the diffusion of carbon at the interface is obvious, and it is easy to form a brittle phase
Third, the brittleness at the interface is relatively high, the strength is not enough, and it is easy to cause cracking

Method used

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  • Laser-arc compound remanufacturing method for TRT bearing cylinder iron castings
  • Laser-arc compound remanufacturing method for TRT bearing cylinder iron castings
  • Laser-arc compound remanufacturing method for TRT bearing cylinder iron castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] There is a lot of corrosion and wear on the surface of the TRT bearing cylinder casting iron, the wear thickness reaches 30mm, and there are a lot of cracks on the surface, and the preliminary detection determines that the crack depth reaches 15mm. The remanufacturing repair steps are as follows:

[0028] (1) Removal of the fatigue layer of TRT bearing cylinder iron castings: use an angle grinder or a grinding wheel to remove the fatigue layer on the surface to be repaired, expose the fresh matrix, and smooth the surface;

[0029] (2) Clamping of cylinder-bearing cast iron parts: fix the cylinder-bearing cast iron parts on the working turntable, the axis of the cylinder-bearing cast iron parts coincides with the axis of the turntable, and the laser head is offset in the direction perpendicular to the cladding direction every time the cylinder is rotated once 2mm;

[0030] (3) Powder drying: Put the self-fluxing alloy powder into a vacuum oven, evacuate to below 0.1MPa,...

Embodiment 2

[0036] There are uneven corrosion and wear phenomena on the surface of TRT bearing cylinder castings. The maximum wear pit depth reaches 40mm, and there are a large number of cracks on the surface. The preliminary detection determines that the crack depth reaches 12mm. The remanufacturing repair steps are as follows:

[0037] (1) Removal of the fatigue layer of TRT bearing cylinder iron castings: use an angle grinder or a grinding wheel to remove the fatigue layer on the surface to be repaired, expose the fresh matrix, and smooth the surface;

[0038] (2) Clamping of cylinder-bearing cast iron parts: fix the cylinder-bearing cast iron parts on the working turntable, the axis of the cylinder-bearing cast iron parts coincides with the axis of the turntable, and the laser head is offset in the direction perpendicular to the cladding direction every time the cylinder is rotated once 1.8mm;

[0039] (3) Powder drying: Put the self-fluxing alloy powder into a vacuum oven, evacuate ...

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Abstract

The invention relates to a laser-arc compound remanufacturing method for TRT bearing cylinder iron castings. Alloy powder comprises the following components in percentage by weight: 0.01-0.03% of C, 2.5-3.5% of Si, 0.5-1.5% of B, 0.2-0.5% of Fe, 10-15% of Cu, and the balance of Ni. Self-melting alloy powder is adopted to perform the laser cladding-arc welding compound remanufacturing repair on theTRT bearing cylinder iron castings; and cladding layers are lower in heat expansion characteristic, and brittle phases in repair layer and basal body interface areas can be prominently reduced, so that the interface area strength is improved, interface area cracks are prevented, and the repair quality is improved.

Description

technical field [0001] The invention relates to a self-fluxing alloy powder used for repairing TRT bearing cylinder iron castings. More particularly, the present invention also relates to a method for repairing a TRT bearing cylinder iron casting. Background technique [0002] The TRT bearing cylinder iron casting is a ring-shaped ductile iron casting. The inner wall of the bearing cylinder casting iron is continuously damaged and peeled off after being eroded and corroded by sediment, cinder, etc. during service, and the inner wall cannot be used after the size of the inner wall is out of tolerance. In order to restore the size of the inner wall of the cast iron bearing cylinder, it is necessary to remanufacture and repair the inner wall surface. The common repair method is manual welding rod repair. The steps of the method are: directly performing welding repair after grinding the inner wall, hammering the weld seam during the repair process, and performing stress relief...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/348B23K35/30B23K26/70
CPCB23K26/348B23K26/702B23K35/3033
Inventor 董世运韩宏升闫世兴李永健韩佳杰王超赵荣星徐滨士
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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