The improvement of gears improves the machining accuracy of the gears. The machining accuracy of the original high-speed gears is increased from 8 to 7 to ensure the accuracy and precision of the gears in the machining stage, improve the meshing accuracy and load capacity of the gears, and make the gears Smooth, reduce vibration and noise, and protect bearings. Thereby increasing the service life of the gears and bearings. The use of the displacement gear is limited by the diameter and width of the gear, and it is impossible to increase the strength of the gear by increasing the number of teeth, the modulus and the tooth width. In addition, the center distance deviation and the basic circle diameter of the FJ350 combined reducer high-speed gear are 10.8 mm larger than the root circle, which cause the tooth tooth registration and transmission stability to decrease. The displacement gear not only improves the strength and coincidence of the gear, but also eliminates the deviation of the center distance and obtains a reasonable tooth profile. For this purpose, the high-speed Herringbone gear is used to transmit the pinion displacement coefficient x=0.4, and the large gear displacement coefficient x=-0.4.
Improvement of gear material and application of laser quenching The original high-speed gear shaft has a short service life, and pitting and broken teeth often occur. In order to improve the comprehensive mechanical properties of the gear material, the original high-speed gear shaft material is made of cast steel 42CrMo and 34CrNi3Mo; in order to improve the contact strength of the tooth surface, the tooth surface quenching is adopted. The technical requirements of the heat treatment were modified to: After the quenching and tempering treatment, the finished car was sent to our factory for laser quenching. Required hardness: quenching and tempering HB280-300, tooth surface and tooth groove laser quenching HRC45-50. Laser quenching makes the gear deformation very little, and can reduce the tooth surface roughness without grinding teeth. More importantly: the hardness value and the gradient of the hardness of the quenching hardness can be controlled in the tooth profile and the depth of the layer. The quenching along the tooth groove causes the prestressing stress to be generated in the tooth root, which can offset the tooth root in the machining and use of the tooth. The tensile stress generated. Due to the use of the process, the tooth surface performance of the high speed gear shaft is improved, thereby improving the tooth surface contact fatigue strength and the root bending fatigue strength. 3 Conclusion Through the continuous implementation of the above measures, the average continuous use time of the FJ350 combined reducer has been increased by 5 times, and the FJ320 combined reducer has been increased by 4 times. Compared with previous years, the number of joint reducer replacements has decreased by 11 times. A total reduction of economic losses of 1.738 million yuan. The problems existing in the wire workshop FJ350 and FJ320 combined reducer, through effective measures, many problems have been solved, and satisfactory economic benefits have been obtained.
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