At present, in the normal work of the CNC cutting machine used in the factory, the operator can successfully complete the cutting work by using the breakpoint continuous cutting function of the cutting machine. The method is as follows: when the operator wants to stop the work and save the breakpoint of the cutting site in the process of cutting, press the s key to stop when running to the idle section, and then press the Enter key to exit the cutting operation. At this time, the breakpoint data is memorized by the system. At this time, the operator should remember the coordinate values in X and Y directions, and then turn to the idle path operation to make the cutter move in the opposite direction until the coordinate values in X and Y directions are the same as the coordinate values memorized above, and the positive and negative signs are different (this position is the starting point of the program and also the origin of the steel plate). Next time when starting the machine, enter the letter C at the corner of the steel plate to continue to complete the last interrupted cutting operation.
According to the above operation method, the operator must first control the cutter to return to the starting point of the program (or the origin of the steel plate) in order to continue cutting in the next work. Obviously, if the cutting machine breaks down suddenly in normal operation (such as power failure, servo system failure, control computer crash, etc.), the operator cannot make it return to the starting point of the program (or the origin of the steel plate) because it has no power-off memory function.
In this case, our general practice is: after the cutting machine is repaired and restored to normal, the remaining steel plate is aligned, and then a new program is compiled by the programmer for cutting. In this way, some parts at the breakpoint are not cut completely, which makes them unable to be used, resulting in the waste of raw materials, increasing the production cost, and also bringing repetitive labor to the programmer, which leads to the reduction of production efficiency.
In the production practice, we successfully solve the problem of returning to the program starting point (or steel plate origin) after the cutting machine failure occurs by setting the zero point artificially. The specific operation method is as follows: first, operate the cutting machine to make the longitudinal sliding seat contact the measuring rod slowly, and compress the spring to make it deform properly. At this time, set the dial indicator head to “0”; then use the same method to set the dial indicator head of another zero setting device to “0”. No matter how many X and Y coordinates are displayed by the cutting machine, press Z key to make them all return to zero. This position is the zero point set by human for the cutting machine. Then operate the cutting machine according to the position of the steel plate to set the starting point of the program (or the origin of the steel plate). After setting, remember the coordinates of X and Y directions at this time. This coordinate value is the relative position between the zero point of the cutting machine and the starting point of the program (or the origin of the steel plate). When the fault occurs, first remove the fault, after the cutting machine returns to normal, use the above method to make it zero, and then use the coordinate value remembered to find the starting point of the program (or the origin of the steel plate). In this way, the breakpoint continuous cutting can be realized smoothly until the whole steel plate is cut.
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