Feed rate control system for five-axis digital control processing

Abstract

The invention relates to a feed rate control system for five-axis digital control processing, which belongs to the technical field of mechanical digital control processing. The system comprises a processing code reading module, a coordinate transformation module and a feed rate optimization control module, wherein the processing code reading module is connected with the coordinate transformation module and the feed rate optimization control module and transmits the information of a coordinate position in a machine tool coordinate system; and the coordinate transformation module is connected with the feed rate optimization control module and transmits the information of a cutter location in a workpiece coordinate system. The system has high computational efficiency and is suitable for controlling the feed rates of five-axis linkage digital control processing codes of various structural types.

Description

technical field [0001] The invention relates to a system in the technical field of mechanical numerical control machining, in particular to a five-axis numerical control machining feed rate control system based on the kinematics performance of machine tools and tool tip points. Background technique [0002] CNC machine tools have been widely used in the manufacturing industry. Compared with traditional three-axis CNC machining, five-axis CNC machining can significantly improve processing efficiency, enhance tool accessibility and shorten tool length, providing an effective solution for the processing of complex parts. means. In five-axis CNC machining, there are many problems at a constant feed rate. Due to the different geometric surfaces of the parts, the cutting allowance of each part of the blank is also different. The actual speed and acceleration of the tool tip point change drastically under the same feed rate. If the feed rate is too high, it may exceed the speed an...

AI Technical Summary

Problems solved by technology

In five-axis CNC machining, there are many problems at a constant feed rate. Due to the different geometric surfaces of the parts, the cutting allowance of each part of the blank is also different. The actual speed and acceleration of the tool tip point change drastically under the same feed rate. If the feed rate is too high, it may exceed the speed and acceleration limits of the machine tool axis, causing vibration of the machine tool, resulting in unstable machining process, reducing the machining quality and tool life. At the same time, the feed rate is also one of the main factors determining the cutting force. If the feeding rate is too low, the processing efficiency will be greatly reduced

However, the shortcoming of these commercial software is that it does not take into account the constraints of the kinematics of the machine tool itself on the feed rate: the movement speed of the machine tool cannot exceed a certain value, otherwise it will cause damage to the mechanical structure of the machine tool

Similarly, the mutation value of the machine tool movement speed means that the acceleration cannot exceed a certain value, otherwise it will cause the movement of the machine tool to shake, affect the machining accuracy of the machine tool, and at the same time cause damage to the machine tool machinery and servo mechanism

Therefore, the planned NC program may lose its usability because the performance of the machine tool cannot be achieved

[0004] After searching the literature of the prior art, it was found that there is a speed preprocessing method constrained by the kinematic characteristics of the machine tool (Zhao Donglin, Research on the Feed Speed ​​Planning Algorithm for Continuous Machining Paths, Combined Machine Tool and Automatic Processing Technology 1001-2265(2006)) , under the premise of satisfying the mechanical characteristics of the machine tool and the characteristics of the motion trajectory, the maximum feed rate is calculated, but this method does not consider the speed and acceleration limits of the tool tip point in the workpiece coordinate system, and is only used for three-axis CNC machining, and cannot For 5-axis machining

Images