A
numerical control cutting bed movement control method based on offset amount NURBS (Non Uniform Rational B Spline) curve is as follows: a data read-in module reads in leather
processing path
control point information and offset amount of curve rail required to be adjusted, an interpolation module calculates node vector according to read-in information points; a distance amount calculated by taking particular values for a primary function and a
weight factor is calculated according to the node vector; deformation reconstruction of NURBS rational fraction is performed according to the offset amount and the distance amount, and the
weight factor is replaced by the offset amount; according to the reconstructed NURBS rational fraction, the whole path is divided into sections; then the
running time of each section is calculated, the variable quantity of U value can be obtained; an interpolation point can be obtained according to the variable quantity of the U value, and the interpolation control module outputs the interpolation point to a mechanical motion module to control a cutter to
machine a workpiece. Through the way, a spline method is used for interpolation, the
weight factor is replaced by the offset amount, and the disadvantages that a current leather
cutting bed is incapable of high precision
machining of a free - type path, the processed path cannot be simply adjusted, and NURBS method interpolation parameters are difficult to understand can be overcome.