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Improve the tooth surface contact precision Gear grinding process The grinding process of the gear is to process the large gear to the dimensional accuracy required by the pattern, and the appropriate direction of the gear tooth thickness direction, by matching in the mating table or the reducer body (or A large-gear gear is measured on the detector, and a process method for correcting the pinion gear after finding the relative deviation of the tooth shape and the tooth direction is found.
Fit the contact on the mating table (1) Mount the large and small gears on the mating table, make the large and small gear axes parallel, and adjust the center distance to the size and tolerance required by the pattern... (2) On the tooth surface of the large gear On the upper side, brush a thin layer of red dan along the length of the tooth, turn the pinion, observe the contact position of the pinion and the horizontal contact area of ​​the level. (3) According to the 8 kinds of meshing contact conditions shown, select the adjustment end of the pinion gear, and raise the horizontal position of the tooth end until the contact position of the large and small gears along the tooth direction meets the requirements of the pattern, and measure the actual adjustment with a dial gauge. value. (4) Convert the measured adjustment value to the measured grinding helix angle b.
The tooth surface contact before and after adjustment is adjusted on the mating table. The adjustment operation is simple, the measurement is convenient, and the application range is wide. In the body directly contact with the direct contact in the body is based on the body bearing hole as the reference, adjust the tooth surface contact area, measure its adjustment value, calculated into a new parameter of the pinion with grinding. The specific operation steps are the same as the step (2) (6) of the matching step on the mating stage.
The method of contacting the high-speed bearing in the mating table is that the method is directly matched on the use reference, which can eliminate the tooth-to-earth error of the gear, the manufacturing error of the gear, etc., which affect the contact surface of the gear pair, and can directly reflect the inadequacy of the actual working condition of the gear. It is difficult to measure at high speed, and the application is narrow (such as vertical reducer), which increases the manufacturing cost of the product.
According to the measured value on the measuring instrument, the grinding is performed according to the measured value on the measuring instrument. The large gear is rough-finished and then measured. The actual tooth profile and tooth direction of the large gear machining are used as the reference tooth profile and the reference tooth direction. To control the tooth profile and tooth accuracy of the pinion. The influence of the tooth shape and tooth direction error of the two gears on the tooth surface contact is reduced to the influence of the tooth shape and the tooth direction error of one pinion on the tooth surface contact. This method measures the data accurately and can be matched at both the tooth height and the tooth length of the contact surface. However, this method cannot consider the influence of the manufacturing error on the tooth surface contact and is limited by the measuring range of the meter.
Gear grinding process loading and running gear process loading and running gear technology is to engage the gear and the mating gear in the normal way in the body, apply the grinding grease on the gear tooth surface, plus the appropriate speed and load to run Combined process.
Electric pulse grinding process Electric pulse grinding process is to apply the principle of EDM to the gear grinding teeth. Electric discharge machining is a processing method in which a part of a metal material is etched by using an electric erosion effect of a spark discharge between two electrodes in a certain processing medium. The electric pulse grinding tooth has high efficiency, is not limited by the hardness of the workpiece, and reduces the manual labor of the worker. However, during the grinding process, the lubricating oil is often poured into the meshing portion of the gear, and the linear speed of the gear is maintained at 1 m/s or more to form an oil film to generate an electric spark.
Electrolyte grinding process Electrolyte grinding is a new process that uses electrolytic machining and mechanical grinding to improve the accuracy of tooth surface contact. Electrolytic processing is to make the gear as the anode quickly form a thin and uniform high-resistance protective film during the electrolysis process, protect the metal surface from further electrolysis, and then scrape the protective film on the gear by the action of mechanical grinding. Then it was electrolyzed and scraped off. This protective film is continuously generated and continuously cast out, so that the contact surface of the gear working surface is rapidly expanded until the contact requirements are met.
Conclusion The improvement of cylindrical helical gear meshing is a comprehensive technology. In addition to the two aspects mentioned above, it also includes the quality control of the gear during the manufacturing process. The process optimization, including the use of suitable heat treatment methods, the selection of appropriate lubrication. Oil and so on, this article will not repeat, with the use of advanced computer-aided technology, the potential of this aspect can be fully exploited, so as to better improve the conditions of gear meshing.