Statistical model-based moving beam type gantry type machine tool dual-drive feed error compensation method and model

Abstract

The invention discloses a statistical model-based moving beam type gantry type machine tool dual-drive feed error compensation method and model. According to the method, based on two-shaft non-synchronous error analysis, multiple linear regression is adopted to find the relationship between dual-drive non-synchronous errors and main influencing factors, and a statistical analysis model is established, and instruction feed-forward compensation is performed on the dual-drive non-synchronous errors, and therefore, the accuracy of dual-drive synchronous control is improved. The method of the invention is a novel dual-drive non-synchronous error compensation method. With the method of the invention adopted, problems in moving beam type gantry type machine tool dual-drive non-synchronous error dynamic compensation can be solved. Different positions of the double driving shafts where a cross beam is located, the speed of the double driving shafts, and influence of the change of the mass of double-shaft load on dual-drive non-synchronous errors when a main shaft moves on the cross beam are considered.

Description

【Technical field】 [0001] The invention relates to the technical field of error compensation, in particular to an error compensation method for a double-drive feed system of a moving beam type gantry machine tool. 【Background technique】 [0002] The beam part (or two columns) of the moving beam type gantry machine tool is jointly driven by double motors and double lead screws. Due to the inconsistency of the mechanical and electrical characteristics of the double drive shafts, the structural coupling of the two shafts, and the different positions of the spindle on the double drive beam Factors such as inconsistent loads on the two axes will cause the dual drives to be out of sync, which will affect the positioning / repeat positioning accuracy of the machine tool and the machining accuracy of the parts. In severe cases, the dual drive and two axes will lock up. [0003] The traditional compensation method measures the error in the machining process of the CNC machine tool, esta...

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Problems solved by technology

[0002] The beam part (or two columns) of the moving beam type gantry machine tool is jointly driven by double motors and double lead screws. Due to the inconsistency of the mechanical and electrical characteristics of the double drive shafts, the structural coupling of the two shafts, and the different positions of the spindle on the double drive beam Due to factors such as inconsistent loads on the two axes, the dual drives will not be synchronized, which will affect the positioning / repeat positioning accuracy of the machine tool and the machining accuracy of the parts. In severe cases, the dual drive and two axes will lock up.

[0003] The traditional compensation method measures the error in the machining process of the CNC machine tool, establishes a corresponding compensation table, and embeds it into the CNC system to compensate the points within the entire stroke. Although it can achieve the effect of error compensation, the error will vary with the working conditions. changes, so the error compensation table is difficult to establish accurately, and cannot characterize the main factors affecting the synchronization error

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