A closed-loop control method for automatic dimensioning of CNC machine tools

Abstract

The invention discloses an automatic length cutting and loop closing control method for numerically-controlled machine tools, belongs to the technical field of numerically-controlled machine tool automatic control methods, and the automatic length cutting and loop closing control method for the numerically-controlled machine tools can achieve accurate automatic length cutting, has a simple control system, and is high in stability. The method includes the following steps: step 1, initial positioning; step 2, work piece walking and distance measurement; step 3, precision judgment, entering step 4 if a precision is not in the range of control precision, and entering step 5 if the precision is in the range of control precision; the step 4, calibration and accurate positioning; the step 5, completing length cutting. The method is suitable for machining of various work pieces by using the numerically-controlled machine tools, and particularly suitable for machining of work pieces with a preset walking distance by using saw drill joint numerically-controlled machine tools.

Description

technical field [0001] The invention specifically relates to a closed-loop control method for automatic sizing of a numerical control machine tool, and belongs to the technical field of automatic control methods for a numerical control machine tool. Background technique [0002] For CNC machine tools, especially saw-drilling combined CNC machine tools, in order to meet the technological requirements of high-speed positioning and precise cutting, the control system is required to be able to achieve accurate automatic sizing. In actual production, for workpieces such as rails with a long predetermined travel distance, usually It only calculates the fixed-length position accurately once, that is, the initial positioning position is calculated by the front and rear pinch roller motor encoders, and after a certain distance, the positioning position is recalibrated by the detection element at a fixed position, and then the final precise positioning is calculated by the measuring wh...

AI Technical Summary

Problems solved by technology

[0002] For CNC machine tools, especially saw-drilling CNC machine tools, in order to meet the technological requirements of high-speed positioning and precise cutting, the control system is required to be able to achieve accurate automatic sizing. In actual production, for workpieces such as rails with a long predetermined travel distance, usually It only calculates the fixed-length position accurately once, that is, the initial positioning position is calculated by the front and rear pinch roller motor encoders, and after a certain distance, the positioning position is recalibrated by the detection element at a fixed position, and then the final precise positioning is calculated by the measuring wheel encoder The position is precisely determined by the rear pinch roller encoder, and whether the final positioning is accurate will not be considered. This will cause an inaccurate fault in the actual travel distance caused by the pinch roller encoder, measuring wheel encoder or mechanical equipment.

If the general closed-loop control method is adopted, the stability will be affected due to the complexity of the system

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