A Design Method of Cam Contour

Abstract

The present invention relates to the technical field of cams, in particular to a design method of a cam profile, comprising the following steps: (1) determining the motion law of the heald frame, establishing a general curve motion law equation, and selecting the characteristic factor T 1 =T 2 =0.1,T 3 =T 4 =0.5, T 5 =T 6 =0.9, get the corresponding parameter C i , B i 、A 1 and A 2 ; (2) Establish the function expression of the cam push and return section; (3) Draw the cam profile through Adams modeling. The present invention adopts the general curve movement law of the correction coefficient to reduce the maximum speed and maximum acceleration of the cam, and the speed, acceleration and jerk curves are smooth and continuous, have good kinematics characteristics, and achieve ideal design effects. The opening machine of textile machinery is a medium-high-speed medium-load mechanism, and the characteristic value V of the cam curve should be selected in the cam design. m 、A m and (AV) m Smaller curves to improve stress conditions are calculated when T 1 =T 2 =0.1,T 3 =T 4 =0.5, T 5 =T 6 =0.9, V m 、A m and (AV) m Obtaining the optimal value improves the scientific accuracy of cam design, reduces errors, and avoids the problems of low precision and poor dynamic characteristics of related products.

Description

technical field [0001] The invention relates to the technical field of cams, in particular to a method for designing a cam profile. Background technique [0002] At present, in the design of the cam structure of the shedding machine of textile machinery, it is necessary to use the Adams software to establish a virtual prototype model according to the motion diagram of the mechanism. First, select the appropriate function to design the motion law of the heald frame. The motion laws usually selected include: 3-4-5 order polynomial displacement, harmonic displacement (cosine acceleration), cycloid displacement (sine acceleration), trapezoidal acceleration, equal jerk motion law, improved trapezoidal acceleration, improved sine acceleration, 4-5-6-7th order polynomial displacement and high degree polynomial displacement curve, etc. However, the above motion rules cannot meet the design requirements. The maximum speed and maximum acceleration of the cam designed by the traditio...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the cam designed by the existing cam profile design method has poor motion characteristics and easily deviates from the actual cam profile

Images