Aviation heavy-duty gear and preparation method thereof
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A gear and aviation technology, applied in the field of aviation parts manufacturing, can solve the problems of low process control accuracy, restricting the development of mechanical equipment, and heavy structure.
Pending Publication Date: 2021-12-10
BEIJING GOLDEN WHEEL SPECIAL MACHINE +1
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[0002] When the gear is working, the stress on the tooth surface is complicated. It is subjected to alternating contact stress during the meshing process, while rolling and sliding, and abrasive wear caused by particles mixed in the lubricating oil, etc., all increase the fatigue of the gear. failure rate
Due to more complex working conditions and harsher environments, heavy-duty gears have problems such as short life, heavy structure, and poor reliability, which seriously restrict the development of the entire mechanical equipment.
[0003] The fatigue performance of gears...
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[0031] The invention provides a method for preparing an aviation heavy-duty gear, comprising the following steps:
[0032] performing laser micro-texture treatment on the tooth surface of the heavy-duty gear base, forming a laser micro-texture layer on the tooth surface, and obtaining a micro-textured heavy-duty gear;
[0033] Carrying out carbonitriding, quenching and tempering sequentially on the surface of the micro-textured heavy-duty gear to form a penetration strengthening layer to obtain a strengthened heavy-duty gear;
[0034] After plasma cleaning the strengthened heavy-duty gear, vapor deposition is carried out to form a gradient hard anti-friction coating on the penetration enhancement layer to obtain an aviation heavy-duty gear; the gradient hard anti-friction layer includes deposition on the A Cr layer on the infiltration enhancement layer, a CrN layer deposited on the Cr layer, a CrWCN layer deposited on the CrN layer, and a WC-DLC layer deposited on the CrWCN la...
Embodiment 1
[0080]Put the planetary gear (9310 steel, outer diameter 82.43mm, modulus 4.5) and sun gear (9310 steel, outer diameter 118.36mm, modulus 4.5) into deionized water and water-based cleaning agent for ultrasonic cleaning, specifically The process parameters are shown in Table 2, and the cleaned gear is obtained;
[0081] A picosecond laser is used to micro-texture the cleaned gears. The laser processing parameters are set to a pulse width of 10 ps, a frequency of 405.5 kHz, a laser power of 11 W, and a pulse number of 15. The structure parameter is a laser micro-textured layer with a diameter of 45 μm, a depth of 10 μm, and an interval of 2 times the diameter of the micro-pit;
[0082] Carry out heat treatment on the gear with the above-mentioned laser micro-texture layer, and the conditions of carbonitriding heating are: pass through the mixed infiltration agent of methanol, acetone and ammonia for carbonitriding, the co-infiltration temperature is 925 ℃, and the holding time...
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Abstract
The invention belongs to the technical field of aviation part manufacturing, and particularly relates to an aviation heavy-duty gear and a preparation method thereof. According to the aviation heavy-duty gear and the preparation method thereof, the tooth surface of the heavy-duty gear is firstly subjected to laser micro-texture treatment, the macroscopic oil storage capacity and the self-lubricating performance of the working surface of the gear are improved, then the heavy-duty gear is subjected to carbonitriding, quenching and tempering heat treatment, a permeation strengthening layer is formed on the surface of a gear base body in a permeation mode, and the surface hardness of the gear is improved; good base body support is provided for vapor deposition plating of a gradient hard anti-friction coating on the surface of the gear base body in the next step, the eggshell effect of a soft base body and a hard coating is avoided, and the gradient hard anti-friction coating and the surface of the gear have good bonding performance; and the surface hardness, the contact fatigue performance and the self-lubricating performance of the gear are further improved by vapor deposition of the Cr layer, the CrN layer, the CrWCN layer and the WC-DLC layer gradient hard antifriction coating in sequence.
Description
technical field [0001] The invention belongs to the technical field of aviation parts manufacturing, and in particular relates to an aviation heavy-duty gear and a preparation method thereof. Background technique [0002] When the gear is working, the stress on the tooth surface is complicated. It is subjected to alternating contact stress during the meshing process, while rolling and sliding, and abrasive wear caused by particles mixed in the lubricating oil, etc., all increase the fatigue of the gear. probability of failure. Due to more complex working conditions and harsher environments, heavy-duty gears have problems such as short life, heavy structure, and poor reliability, which seriously restrict the development of the entire mechanical equipment. [0003] The fatigue performance of gears can be improved to a certain extent through surface strengthening technology, such as traditional methods such as carburizing, nitriding and carbonitriding, which can be improved th...
Claims
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