Closed-loop virtual system of numerically-controlled machine tool and its control method

Abstract

The invention discloses a closed loop virtual system of numerical control machine and a control method thereof, comprising a central control card, a power module, a servo virtual unit, a machine tools electric virtual unit and a peripheral hardware circuit. The work power is provided by the power module; controlling and data transformation are conducted between the servo virtual unit and the controller of the machine tool numeric control system axis of the machine tools as well as the machine tools electric virtual unit and the I / O controller of the numeric machine tool; the servo virtual unit and the machine tools electric virtual unit are respectively connected with the central control card; a closed loop virtual system software exists in the central control card. The method includes that a mathematic model is built, the control signal of the system is detected and transformed into a mathematic parameter to be substituted into the mathematic for calculation, the acquired control parameter is transferred into a feedback signal to the machine tool numeric system, and the control signal of the next period is output according to the feedback signal by the machine tool numeric system. The invention solves the test problem of large scale production by numeric control machine tool producers, and has good extendibility and replaceability.

Description

technical field [0001] The invention relates to a test system for testing the function, performance and precision of a numerical control system, especially a closed-loop virtual system of a numerical control machine tool capable of accurately testing the control performance of a numerical control system to a servo motor and the control performance of a discrete I / O point and its control method . Background technique [0002] In recent years, with the continuous development of the national economy, the requirements for manufacturing automation have become higher and higher. CNC machine tools have become popular, and the corresponding demand for various CNC systems has also increased. CNC systems have begun to be put into production on a large scale. In the production process of some CNC systems, the online testing method of connecting servo motors or directly connecting CNC machine tools to the CNC system becomes unfeasible. difficult or unaffordable. [0003] Numerical con...

AI Technical Summary

Problems solved by technology

The numerical control system itself is also a computer. The test and inspection of its computer characteristics can adopt the mature large-scale computer test method, but the numerical control system is used for the detection of the control ability of various mechanical quantities and switching quantities related to the flow direction of mechanical quantities. General computer detection methods cannot be realized

In the production process of small-scale CNC machine tools, each CNC system is generally used to connect the servo motor to control its torque and speed, or to install the CNC system on the CNC machine tool for actual processing to test the reliability of the CNC system and whether it meets the requirements of the CNC system. The factory standard, but when the CNC system needs to be mass-produced, the above-mentioned detection method becomes unfeasible, and the CNC system manufacturer cannot reach a balance between the number of servo motors or CNC machine tools and the testing time for the CNC system. Moreover, the number of motors that can be controlled by different types of CNC systems is different. One machine tool can only test one type of CNC system, which is obviously difficult to meet the needs of CNC system manufacturers.

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