Abstract
In order to reduce the fatigue damage in grooved cam mechanisms, grooved cam profile was reconstructed with non-uniform rational B-splines (NURBS). Considering joint friction, dynamic model of grooved cam mechanisms was established and the contact stress between grooved cam and follower was calculated using Hertz contact theory. Taking the minimum contact stress and the minimum acceleration as optimal objectives, integrated design model for respective kinematic and dynamic design approaches was set up. The integrated design mode was optimized to search Pareto-optimal solution by an improved artificial fish swarm algorithm, and optimized NURBS profile for grooved cam was acquired. The results show NURBS profile has better kinematic and dynamic performances. The impacts on grooved cam mechanism are reduced and wear characteristics are improved.
Highlights
As a kind of cam mechanisms, grooved cam mechanisms are widely used in various automatic machines, such as assembly manipulator, packing and agricultural machinery, etc
There are a series of studies to improve the mechanical properties of cam mechanisms by optimizing the structure parameters and using excellent motion curves such as polynomial curve [4], spline curve [5,6], nonuniform rational B-splines [7,8] and other curves, but all these researches are rarely related to grooved cam mechanisms
Maximum angular velocity and maximum angular acceleration are reduced by optimizing cam profile with non-uniform rational B-splines (NURBS) curve
Summary
As a kind of cam mechanisms, grooved cam mechanisms are widely used in various automatic machines, such as assembly manipulator, packing and agricultural machinery, etc. Mechanical properties of grooved cam mechanisms are concerned in industrial practices and frequently studied in literature [1,2,3]. There are a series of studies to improve the mechanical properties of cam mechanisms by optimizing the structure parameters and using excellent motion curves such as polynomial curve [4], spline curve [5,6], nonuniform rational B-splines [7,8] and other curves, but all these researches are rarely related to grooved cam mechanisms. Non-uniform rational B-splines was adopted to reconstruct the grooved cam profile and dynamic model of grooved cam mechanisms was established. Considering the kinematic and dynamic integration method, multi-objective optimization model of grooved cam mechanisms was set up for reducing the peak value of the contact stress and acceleration. An optimization simulation example was given to compare NURBS profile with traditional cam profile in the end
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