If the contact stress of the tooth surface fatigue pitting tooth surface exceeds the fatigue limit stress, the surface generates fatigue cracks, and the crack gradually expands, eventually causing the tooth surface metal piece to peel off and form fatigue pitting. Fatigue pitting is highly prone to occur in closed drives. Fatigue pitting is often found when the excavator pushes, turns, and lifts the gearbox to disassemble. Fatigue pitting is also the main form of failure in closed drives. The development of fatigue pitting will reduce the working surface area of ​​the gear teeth, destroy the smoothness of the tooth surface, produce stronger vibration and noise, the gear can not work normally, and the tooth will break when it is serious.
Measures to prevent gear failure, choose the appropriate gear material gear is the transmission of power parts, and work under alternating load, so the gear material should have a certain contact fatigue strength and bending fatigue strength. There is a large sliding friction on the tooth surface during gear transmission, which in turn requires the gear material to have sufficient hardness and wear resistance. In addition, the selected material should have a certain impact toughness, and meet the requirements of small heat treatment deformation and good cutting performance. WK-4 excavator push gear is cast steel. The cast steel has coarse grain and poor processing performance. Therefore, it is best to use carbon steel with carbon content of 0.15~0.6 and use forged blank. After forging and roughing, the internal structure forms favorable forging lines, thereby increasing the strength of the gear.
Improve gear design and manufacturing accuracy In order to improve the bending strength of the gear teeth, the gear modulus can be increased. By improving on the basis of the WK-4 excavator, the modulus of the WK-4A push gear and rack is from the original 24 increased to 27, the strength of the gear is increased, and the phenomenon of broken teeth is greatly reduced. In addition, it is necessary to improve the manufacturing precision of the gear as much as possible, increase the surface roughness, grind the root of the tooth, reduce the stress concentration caused by the machining of the tool mark, and leave enough transition circle to effectively reduce the stress. concentrated.
In order to avoid motion eccentricity, the installation eccentricity of the work table indexing worm gear should be reduced. In addition, the tool should be selected correctly so that its accuracy, installation accuracy, etc. meet the requirements. The parallel shaft helical gear meshing process is from one end face into the meshing, gradually transitioning to the other end face separation, the contact is a point-to-line, and then a line-to-point gradual process, and each instantaneous contact line is not the same along the tooth width. On the cylindrical surface, the error of the gear is not sensitive, the degree of coincidence is large, and the contact of the tooth surface is good, so the transmission is stable, the bearing capacity is high, and the impact, vibration and noise are small. Therefore, the spur gear can be replaced by a helical gear to improve the smoothness of the transmission.
Reasonable heat treatment of the gears In the processing of the gears, two heat treatment processes should be carried out according to different purposes. Proper operation Careful maintenance and maintenance of the life of the excavator gear is also largely dependent on the skill of the operator. For complex ore bodies, the operator should master the use of appropriate shaft thrust, push, walk, swing, and lift should be operated in strict accordance with the operating procedures; strictly implement the maintenance procedures of the excavator to ensure timely maintenance of the gear; The maintenance and replacement of gears must strictly abide by the technical specifications of the equipment to ensure the quality of maintenance. At the same time, the daily inspection of the operators and the full-time inspection of technicians should be strengthened to improve the technical level of maintenance, scientific management and rational use.
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