Prospective interpolation system for compressing and smoothening small segment paths

Abstract

The invention provides a prospective interpolation system for compressing and smoothening small segment paths. The prospective interpolation system comprises a path smoothening module, a curve scanning and segmenting module, a bidirectional acceleration module, a speed planning module and an interpolation module, wherein the path smoothening module is used for extracting small segment coordinate information in codes by reading information of G01 segments of numerical control codes G, conducting calculation according to the coordinate information and conducting path compression and smoothening on small segments; the curve scanning and segmenting module, the bidirectional acceleration module and the speed planning module complete S-shaped speed planning tasks with limited jerk; the interpolation module is used for generating discrete interpolation points according to planning speed obtained through calculation; the interpolation points can be stored and used for position closed-loop control. The prospective interpolation system is high in calculation efficiency in the whole process, small in calculation quantity, simple in programming realization and capable of being further applied to a high-speed and high-precision numerically-controlled machine tool.

Description

technical field [0001] The present invention relates to an off-line system in the technical field of numerical control machining, especially a system capable of generating B-splines according to small line segments (G01 code), and then performing speed planning with limited jerk, and then generating interpolation points, specifically relating to small line segment paths Compressed smooth look-ahead interpolation system. Background technique [0002] In CNC machining, usually the post-processor of CAM (Computer Aided Manufacturing) software will decompose the complex path into a series of tiny path segments according to the requirements of machining accuracy, and then the interpolator in the CNC system will The interpolation operation is performed on the segment path, and then the closed-loop control is carried out. On the one hand, a large storage space is required to store data; on the other hand, due to the incoherence of speed planning, it will inevitably lead to the red...

AI Technical Summary

Problems solved by technology

[0004] Searching the existing technologies found that Bezier curves are also used to transfer small line segments (CN102147600). However, due to the transfer method, the amount of data to be stored is still large, and it is not conducive to the continuity of speed planning.

In addition, the Bezier curve is inconvenient in design and modification due to its lack of local support.

In terms of speed planning, the general method adopts a continuous speed, that is, a limited acceleration method, so there may be a large jump, which will still cause a large impact on the mechanical structure

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