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Carburization-like overloading tooth component tooth surface laser cladding powder material and repairing method thereof

A technology of laser cladding and powder materials, which is applied in laser welding equipment, metal material coating technology, coating, etc., can solve the problems of heavy-duty transmission carburized gear tooth surface repair that cannot be implemented with surfacing technology, plastic toughness reduction, Easy deformation of the substrate and other problems, to achieve the effect of excellent repair quality and performance

Inactive Publication Date: 2008-01-09
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the repair of the carburized gear tooth surface of heavy-duty transmission cannot be implemented by surfacing technology
The reasons are as follows: 1. After the transmission gear tooth surface wears and fails, the carbon content on the surface is still above 0.50%. During surfacing welding, it is easy to produce welding cracks in the surfacing layer and heat-affected zone due to the large amount of heat input; 2. , The matrix under the tooth surface is easily deformed, and the plasticity and toughness are reduced
Therefore, so far, the repair of the worn tooth surface of heavy-duty transmission carburized gears is still a blank

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Laser cladding repair of 18Cr2Ni4WA steel die forging gear wear failure tooth surface. When the new gear is manufactured, it is manufactured through machining, heat treatment (carburizing, quenching, tempering, etc.), grinding the tooth surface and other processes. The manufacturing process of the new product is complicated: after carburizing and air cooling at 910±10°C, normalizing at 890±10°C, high temperature stress relief tempering at 650±10°C, quenching in oil at 800±10°C, low temperature tempering at 150±10°C, carburizing The carbon content on the surface of the layer reaches 1%, the carburizing depth is 1.6mm-1.9mm, and the hardness of the tooth surface is HRC≥57. However, since this type of gear works in a complex and harsh environment with heavy load, high speed, and multiple impacts, the wear rate of this type of gear is very high. According to maintenance technical standards, when the wear amount of the common normal line exceeds 0.30mm, this type of gear is ...

Embodiment 2

[0026] Laser cladding repair of high-quality alloy carburizing steel 20Cr2Ni4A steel gear. The gear has 24 teeth in total. The average carbon content of the carburized layer after tooth surface wear is 0.6%.

[0027] (1) Melting in a medium-frequency induction furnace to prepare flux-type iron-based self-strengthening alloy powder, the powder composition is as follows (mass percentage): 0.98% C, 9.00% Mn, 1.14% Cr, 0.35% Mo, 2.00% B, 3.00% Si, 0.04% P, 0.03% S, and the rest is iron. The particle size is -140 mesh to +260 mesh.

[0028] (2) Adopt continuous wave Nd:YAG solid-state laser, adjust its process parameters, and the laser cladding power density per unit time is 1.6×10 8 W / m 2 , the specific laser cladding process parameters are: laser cladding power 1.5kW, spot diameter 4mm, laser beam scanning speed 140mm / min, powder feeding rate 10.0g / min.

[0029](3) The 12 teeth and 24 tooth surfaces of the gear are repaired by multi-pass laser cladding, and the lap rate is s...

Embodiment 3

[0033] Laser cladding repair of carburized 18Cr2Ni4WA steel gear tooth surface failure. The average carbon content of the worn tooth surface is 0.72%.

[0034] (1) The flux-type iron-based self-strengthening alloy powder is prepared by melting in a medium-frequency induction furnace. The powder composition is as follows (mass percentage): 0.80% C, 7.96% Mn, 1.30% Cr, 0.20% Mo, 3.50% B, 2.50% Si, 0.054% P, 0.03% S, and the rest is iron. The particle size is -140 mesh to +260 mesh.

[0035] (2) Using a direct output continuous wave semiconductor laser, adjusting its process parameters, the laser cladding power density per unit time is 1.35×10 8 W / m 2 , the specific laser cladding process parameters are: laser cladding power 0.9kW, spot size width 4mm, laser beam scanning speed 100mm / min, powder feeding rate 9.0g / min.

[0036] (3) Carry out multiple overlapping laser cladding repairs on each tooth surface of the gear, and the overlapping rate is selected as 40%. When laser c...

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PUM

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Abstract

A process for laser powder-melting onto the surfaces of the teeth parts that are of heavily loaded cemented steel to be repaired is disclosed herewith. The powder of grains = (-140-+260 mesh) comprises (mass%): C 0.80-1.10, Mn 7.50-9.00, Cr 0.90-1.30, Mo 0.20-0.35, B 2.00-3.50, Si 2.50-3.50, and balanced with Fe with impurities of P not more than 0.06 and S not more than 0.04. Laser power density is equal to 1.0 X 108W-109W / m2 per unit of time. The said powder has good re-melting property, self-enhancing and fatigue-resistance performances, so that it can be used to repair worn gears.

Description

technical field [0001] The invention relates to a laser cladding remanufacturing technology of the tooth surface of heavy-duty tooth parts which has been carburized and has been worn out during service in a high-speed and heavy-load environment, and belongs to the field of maintenance engineering. Background technique [0002] Toothed parts often fail due to sliding wear on the tooth surface or contact fatigue pitting. From the perspective of contemporary parts repair technology, the surface bearing contact fatigue stress can only be repaired by surfacing welding technology to ensure sufficient bonding strength between the repair layer and the substrate. However, the repair of the carburized gear tooth surface of heavy-duty transmission cannot be implemented by surfacing technology. The reasons are as follows: 1. After the transmission gear tooth surface wears and fails, the carbon content on the surface is still above 0.50%. During surfacing welding, it is easy to produce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23K26/34
Inventor 徐滨士董世运马运哲
Owner ACADEMY OF ARMORED FORCES ENG PLA
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