The Analysis and Verification for the Forming Method of Novel Toroidal Worm

The novel toroidal worm pair is an improved type of transmission.Based on the forming method,the method of error assess of w orm surface is put forw ard to verify the feasibility of the machining method.The actual coordinates,w hich are obtained by contact measurement of the three-coordinate instrument,are matched w ith theoretic coordinates w ith the radius compensation and coordinate conversion.The actual surface is fitted by bicubic B-spline surface,the sketch of the tooth profile error is obtained w ith the method of normal error,and the impact of error on the meshing points is analyzed.The results show that the tooth profile error is less than 0.0021mm,the trend of the actual tooth profile is consistent w ith theoretic,and the actual meshing points also meet the design requirement,thus verifying the correctness of machining methods.