Oversampling output method for laser flight cutting control

Abstract

The invention discloses an oversampling output method for laser flight cutting control. A main station obtains time shift when laser is turned on or off, by means of DC or IRT, it is ensured that timebases are synchronously sent to an auxiliary station, and an event detector of the auxiliary station triggers a synchronous interrupt process; a single-chip microcomputer carries out judgment, if parameters are correct, one software pulse is triggered, at the ascending edge of each match, interruption is triggered, and counting is carried out in the interruption process; and after the counted number is larger than given time shift, pulse output of software is closed, hardware pulse output is triggered, and pulse output is converted into industrial 24V through an optical coupler to be output to a laser device. According to the oversampling output method for laser flight cutting control, laser signals can be subjected to switch processing within two bus periods, precision can reach 1 microseconds, the system structure is simple, the use cost is low, it can be ensured that the CNC period and the input and output module period are carried out synchronously, and the requirement for flightcutting can be met.

Description

technical field [0001] The invention relates to the field of over-sampling output of digital signals for laser flying cutting, in particular to an over-sampling output method for laser flying cutting control. Background technique [0002] Fly cutting is also called scan cutting. With the continuous rapid development of laser cutting processing technology, more and more new technologies and new cutting processes are widely used in actual part cutting processing, among which the "flying cutting" function is the current very popular advanced high-speed cutting processing Technology; "flying cutting" technology is very suitable for high-speed cutting of thin steel plates. It can place the cutting starting point of the contour on the tangent line of the laser head's movement track without using a lead wire, and minimize the change of the laser cutting direction during cutting. The time and times of perforation are reduced, and the laser head is always in a state of high-speed mo...

AI Technical Summary

Problems solved by technology

At present, the industry can only be realized through the built-in field programmable gate array (FPGA) of CNC or imported oversampling module, but the price and system complexity of these two implementation methods are relatively high

[0005] For the existing oversampling output technology of flight cutting digital signal, (see the attached figure 1 ) It is a logic to turn on the laser between two CNC cycle points, but this logic exceeds the running cycle of CNC and PLC, so it cannot write output periodically, and the CNC can only pre-judge the trajectory and current speed. Obtain the time shift of turning on the laser, that is, the turning on point (such as turning on the laser after 215 microseconds), and then send the time shift to the output module in the current cycle, but this method requires a field programmable gate array (FPGA) or an imported super The sampling module can only be realized, the price is high and the implementation is complicated, and the synchronization of the switching photoperiod cannot be guaranteed by using an ordinary output module

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