Method of resuming transmission from breakpoints during online processing of CNC machine tool dnc

Abstract

The invention discloses a break-point resuming method of a numerical-control machine tool at the time of direct numerical control (DNC) machines online. The break-points resuming method is achieved by sequentially conducting the following steps of machine tool pause operation, latch of the current machine tool coordinate value and the spindle speed value, exception handling, recovery of spindle status, recovery of DNC online machining, recovery of mechanical coordinates of each shaft of the machine tool and execution of following procedures. According to the break-point resuming method of the numerical-control machine tool at the time of the DNC machines online, after abnormal conditions are handled, the machining procedure does not need to start from the beginning of the procedure, the procedure does not need to be deleted, the current position of the procedure, the current coordinate value of the machine tool and the spindle speed value do not need to be recorded manually, the machining efficiency is high, and the operation is convenient.

Description

technical field [0001] The invention relates to a breakpoint resume transmission method, in particular to a breakpoint resume transmission method during DNC online processing of a numerical control machine tool. Background technique [0002] During the automatic operation of CNC machine tools, due to abnormal conditions such as tool breakage, wear, or the need to observe the quality of the processed workpiece, the operation has to be suspended to perform operations such as changing the blade, observing the workpiece, etc., reinstalling the tool or observing the processed workpiece Finally, when the CNC machine tool needs to continue to work, it is generally realized by the following methods: when the processing program is small, the program can be copied to the system memory, and the program restart function provided by the system can be used to find the interrupt point just now, and M, S , T function pre-running, in the automatic mode and then carry out the processing of th...

AI Technical Summary

Problems solved by technology

[0003] However, since the memory of the system is generally small, generally between 256KB and 1MB, large programs cannot be stored in the memory before processing, which requires a connection between the system and the computer, and the computer directly controls the processing, that is, transfers the program While processing, that is to say, DNC online processing, the system caches data as the processing proceeds and discards the program to be executed while caching the program to be executed. If the above abnormal situation occurs during CNC machine tool DNC online processing, the CNC machine tool stops running. After the tool is reinstalled or the workpiece is observed, when the CNC machine tool needs to continue to work, there are two existing methods, one is to run the program from the beginning, that is, the processing program starts from the beginning of the program, and the other is to operate the machine when an abnormal situation occurs The personnel manually record the current position of the program, the current machine coordinate value and the spindle speed value. After the abnormal situation is handled, use the previously recorded program position to delete the program that has been executed on the computer, and manually restore the M, S, T commands. Use the previously recorded spindle speed value to manually restore the spindle to the speed before the pause, and use the previously recorded machine coordinate value to manually move the machine coordinates to the marked position and run the rest of the program. One of these two operations requires reprocessing, It will inevitably cause repetitive labor, which will affect the processing efficiency and quality of the workpiece. The other one needs to delete the program, which is highly professional and inconvenient to operate. Improper operation will cause the CNC machine tool to perform wrong actions, which is very prone to danger and abnormality. In some cases, the operator needs to manually record the current position of the program, the current coordinate value of the machine tool and the spindle speed, which is troublesome