Analysis of the accuracy grade and tooth profile deviation of cutting machine gear
1. Amplitude grade of deviation of gear teeth on the same side
The diameter of the indexing drama is 5-Ioooo, and the modulus (normal modulus) is o. 5-70, tooth width of 4-1000 involute cylindrical gears on the same side of the tooth surface tolerance, including tangential comprehensive tolerance, one tooth tangential comprehensive tolerance, single pitch limit deviation, cumulative pitch limit deviation, tooth Accumulative total tolerance, total tooth profile tolerance and spiral total tolerance, GB / Tlo095.1-2008 stipulates fo, 1-12 with 13 accuracy levels, of which o is the highest and 12 is the lowest.
2. Accuracy grade of radial comprehensive deviation
The diameter of the indexing cluster is 5-1000, and the modulus (normal modulus) is o. The overall radial tolerance of the 2-to-1 lo column reading column gear and the radial comprehensive tolerance of one tooth, GB / D to095.2-2008 stipulates that the factory 4-12 has a total of 9 accuracy levels, of which the highest level 4 and the 12 lowest.
3． Radial runout accuracy class
For the index return diameter is 5-10ooo, 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-level is the highest. 12-level is the lowest.
Among gear accuracy grades, o-1 and 2-level accuracy requirements are very high. Currently, there are 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 the most widely used; Level 9 is a lower accuracy level. Elo-12 is a low accuracy 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, and it 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 complies with the design regulations. 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 the theoretical separation line. In modern gear design, for high-speed gear transmission, in order to reduce the shock, vibration and noise caused by the deviation of the base circle pitch and the elastic deformation of the gear teeth, a modified tooth profile based on the theoretical involute tooth profile is often used. The edge tooth shape, convex tooth shape, etc., therefore, the design tooth profile can be ashamed tooth profile or modified tooth layer.