Optimization Of High-Strength Steel Variable Cross Section Roll Forming Interpolation Control Strategy

The new problems of variable cross section roll forming track curve fitting is solved in the paper, because feeding step length which is a short straight line approaching actual curve cause bow high error, a contour curve interpolation algorithm which limit bow high error and adjust the interpolation step size according to the radius of curvature change is proposed, and a method that according to the maximum allowable machining error and the minimum allowable machining precision calculate bow high error is presented, at the same time calculation method of curvature radius and the principle of adjustment of interpolation step is proposed, meanwhile the key methods and steps of automatically read and parse process documentation are presented. Plank contour curve connection mode is classified, the advantages and disadvantages of different connection mode is analyzed, and the stress distribution in the forming process is analyzed, the stress distribution characteristics of bilateral asymmetry and bilateral symmetric roll bending are different, single channel roll forming velocity distribution is different, the constraints condition of the no mutation speed, the largest of the gear rotation angle and the maximum rotational speed of the motor are proposed to prevent single-channel velocity exceed the limit value of high strength steel variable cross-section roll forming equipment, bilateral constant cross section, unilateral variable cross-section, bilateral variable cross-section and so on three kinds of variable cross section roll forming multichannel velocity distribution is analyzed, it is concluded that the imbalance of the each channel roll imposed force and velocity component in the X direction is the primary cause of local contraction or local spin phenomenon on the X direction local bump and partial concave phenomenon on the Z direction, meanwhile it is concluded that the imbalance of the each channel roll imposed force and velocity component in the Y direction is the primary cause of the forming defect on the Y direction, the unreasonable distribution of velocity can also lead to the noncoincidence between theoretical outline trajectory and the actual contour trajectory, according to the curve convergence point to find out sensitive speed, analysis the optimal acceleration and deceleration control points, and consider curve connection mode and variable speed distance etc, a acceleration and deceleration predictive control algorithm is proposed. the flow chart of the control principle of the control system must be appropriate adjusted according to the control algorithm is put forward, finally real-time planning and feedback regulation of motion control components are realizes according to the corresponding equation relation, calculation of the motor position control components, speed control components and the angular velocity control components, the theoretical research in3D roll forming prototype control system has been applied, the experimental results confirmed that it can meet the requirements of forming precision, effectively restrain the forming defects, with the engineering application prospects.