Electrode wire diameter on-line automatic detection and compensation system during linear cutting

Abstract

The invention provides an electrode wire diameter on-line automatic detection and compensation system during linear cutting, which comprises a data acquiring device, a movement controlling and executing device, an error value analog input device and a linear cutting numerical control system. The movement controlling and executing device conveys the data acquiring device to a testing point for multiple measurement to acquire an average value; the average value is compared with the initial diameter of the electrode wire to acquire a compensation value; the compensation value is converted into akeyboard signal to be fed back to the linear cutting numerical control system through keyboard data conversion circuit in the error value analog input device; and a linear cutting machine controls a linear cutting machine again for compensation cutting after receiving the keyboard signal. Due to the adoption of the new electrode wire automatic detection and compensation method, the system has theadvantages of realizing automatic compensation and zero-labor participation, and saving manpower and financial resource, and also has the advantages of practical data processing method, simple circuit, reasonable structure, low cost, stability and reliability and high compensation precision.

Description

technical field [0001] The invention belongs to the high-precision measurement of the diameter of a wire cutting electrode wire. Background technique [0002] The processing accuracy of wire cutting machine tools for parts (mainly refers to the processing shape accuracy and position accuracy) is not only related to the inherent structural design accuracy of the machine tool, but also has a certain relationship with the cutting diameter accuracy retention. Wire cutting is widely used in processing fields such as precision small cavities, narrow seams, grooves, corners, holes and deep cutting in molds. The self-loss of the electrode wire during use will greatly affect the precision of the mold processing, so it is necessary to measure the diameter of the electrode wire in time to compensate for the loss of the electrode wire during wire cutting. At present, there are mainly two methods for measuring the diameter of the electrode wire: non-contact and contact methods. The non-...

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Problems solved by technology

However, this technology has some disadvantages: the wire cutting processing environment is harsh, and impurities such as oil, coolant, and processing residual particles on the electrode wire are not easy to distinguish after imaging, which greatly affects the measurement accuracy.

[0005] However, the real-time performance of the manual measurement method is not good, it is costly and labor-intensive, and it is inconvenient to implement, and it is difficult to guarantee the accuracy of the measurement.

[0006] When using other detection methods such as CCD technology or manual measurement methods, to compensate the error caused by the loss of electrode wire diameter, it can only be compensated by manual input, and automatic compensation cannot be realized.

[0007] In the existing wire cutting numerical control system, if you want to realize compensation cutting, you can only input it manually, and cannot realize automatic input compensation cutting

If the control system software is modified to provide an interface for compensation, this can solve the compensation problem very well, but the manufacturer will not easily change the control system software according to user needs, and the cost is high, and the debugging is more complicated; To realize the input of compensation parameters, the existing CNC system provides a dialogue window where the diameter of the molybdenum wire can be modified, which requires manual input, which is not conducive to the automation of the entire system

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