Analysis of precision grade and tooth profile deviation of cutting machine gear
1. Magnitude grade of tooth deviation on the same side of gear
The diameter of the indexing drama is 5-Ioooo, and the modulus (normal modulus) is o. 5—70. Tooth surface tolerances on the same side of an involute cylindrical gear with a tooth width of 4—1000, including tangential comprehensive tolerance, one tooth tangential comprehensive tolerance, single pitch limit deviation, cumulative pitch deviation limit, tooth Cumulative total distance tolerance, total tooth profile tolerance and total spiral tolerance, GB / Tlo095.1-2008 stipulates fo, 1-12, a total of 13 accuracy levels, of which o-level is the highest and 12-level is the lowest.
2. Radial comprehensive deviation accuracy grade
The diameter of the indexing group is 5-1000, and the modulus (normal modulus) is o. 2 The overall radial comprehensive tolerance of a lenticular line-reading column gear and the radial comprehensive tolerance of a tooth, GB / D to095. 2—2008 stipulates that the factory 4-12 has a total of 9 accuracy levels, of which 4 is the highest and 12 is lowest.
3． Radial runout accuracy class
For the indexing return diameter is 5-10ooo, and the modulus (normal modulus) is o. Radial runout of 5—70 involute gears. (; B / cutting machine T1009E-22008 recommended o, l-12 a total of 13 accuracy levels, of which o is the highest. 12 is the lowest.
Among gear precision grades, o-grade 2 precision requirements are very high. At present, there are generally no manufacturing and measurement methods, and they are yet to be developed. Grades 3-5 are high-precision grades; grades 6-8 are medium-precision grades, which are most widely used; Level 9 is the lower precision level. Elo-12 level is the lower precision level.
The tooth profile of the involute gear reflects a change in shape. The amount that the actual tooth profile deviates from the designed tooth profile is called the tooth profile deviation, which is measured in the direction of the end plane and perpendicular to the involute tooth profile. The design tooth profile refers to the tooth profile that meets the design requirements. When there is no special requirement, it refers to the end tooth profile. The tooth profile includes the actual tooth profile, the design tooth profile, and the average tooth profile.
The working part of the halogen profile is usually a theoretical open line. In modern gear design, for high-speed gear transmission, in order to reduce the shock, vibration and noise caused by the base pitch deviation and the elastic deformation of the gear teeth, a modified tooth profile based on the theoretical involute tooth profile is often used, such as repair Edge tooth shape, convex tooth shape, etc. Therefore, the design tooth profile can be a split line tooth profile or a modified tooth layer.