Method for smoothing feed speed of multi-axis numerical control (NC) machining

Abstract

The invention discloses a method for smoothing the feed speed of multi-axis numerical control (NC) machining, which can be applied to multi-axis linkage NC machines with any standard or different structures so as to realize the feed-speed smoothing in the process of machining complicated curved surfaces of the multi-axis linkage NC machines. The method disclosed by the invention comprises the following steps: constructing a kinematics model of a multi-axis linkage NC machine at the post-processing stage of multi-axis NC machining, calculating the generalized motion distance of a cutter by using the Jacobean matrix, and then calculating the nominal feed speed of each row of G codes according to an expected surface cutting speed. In the process of carrying out multi-axis linkage NC machining, the multi-axis linkage NC machine moves according to the nominal feed speed, the actual cutting speed of a cutting blade of the cutter relative to the machined surface of a workpiece is the expected surface cutting speed, and the speed is constant, thereby realizing the feed speed smoothing of the cutter, and significantly improving the surface machining quality of parts.

Description

A Feed Speed ​​Smoothing Method for Multi-Axis NC Machining technical field The invention belongs to the technical field of numerical control machining, and specifically relates to a method for smoothing the feed speed of multi-axis numerical control machining by post-processing, which can be used for standard and heterogeneous multi-axis linkage numerical control metal cutting machine tools and multi-axis linkage numerical control welding machine tools The feed rate is smooth when processing complex surfaces with multi-axis linkage CNC grinding machines. Background technique Multi-axis CNC machining technology can effectively improve machining accuracy, shorten production cycle, reduce labor costs, and improve corporate competitiveness. It is the latest development trend in complex parts processing and is widely used in aviation, aerospace, energy, power, automobiles, molds, etc. Cutting-edge industrial fields. Compared with the traditional three-axis CNC machining, the ...

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Problems solved by technology

In addition, although the constant Cartesian space synthesis speed can be realized by the CNC system, for the continuous high-speed processing of small line segment programs, the completion of the above tasks requires the CNC system to have a strong processing ability, and the general CNC system does not have this ability

There is a contradiction between the joint space and the Cartesian space in terms of speed stability, and the general CNC system cannot make up for this defect, which seriously restricts the improvement of the surface processing quality of parts

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