JPH0677207B2 - Method of determining evacuation / reentry route in numerical control device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a method of determining a retreat / reentry path in a numerical controller, and in particular, it is automatically optimized by a retreat / reentry external signal for avoiding an abnormal situation. The present invention relates to a method of determining a retreat / reentry route in a numerical control device capable of generating a retreat / reentry movement route.

(Technical background of the invention and its problems) A numerical control (NC) device normally executes a numerical control process according to a numerical control program data, controls a machine based on this process, and performs machining according to a command on a work. It is designed to let you. Subprograms and user macro functions have been added to recent numerical control devices. If an abnormality occurs during machining, an external signal that notifies the abnormality is received, and the normal numerical control program flow is changed. The flow of the program was switched to the sub-program for error processing and the user macro.

However, it is difficult to prepare the optimum sub-programs and user macros for abnormal processing. Even if they are prepared, a large number of sub-programs, so that they are suitable for each aspect of a normal numerical control program, User macro had to be prepared and not practical.

(Object of the Invention) The present invention has been made under the circumstances as described above, and an object of the present invention is to store the axis movement path data of a normal numerical control program and to avoid an abnormal situation based on this. Therefore, it is an object of the present invention to provide a method of determining an evacuation / reentry path in a numerical control device, which is capable of automatically generating an optimal evacuation / reentry operation avoidance path for abnormality processing.

(Summary of the Invention) The present invention executes a numerical control process based on a numerical control program, controls a machine by the process, and causes a workpiece to perform a machining according to a command. Regarding the determination method, an area requiring evacuation / reentry operation for abnormality processing is set, and a movement route that has entered the area is stored during execution of the numerical control program, and If there is a closed loop, the closed loop is deleted and stored, and when an evacuation / reentry external signal requesting abnormal processing is input, the evacuation / reentry route is automatically set based on the stored travel route. It was decided to decide.

(Embodiment of the Invention) FIG. 1 shows an example of a device for realizing a method of determining a retreat / reentry path in a numerical control device of the present invention, in which a numerical control program is input to a numerical control program decoding means 1, The decrypted numerical control program is input to the area determination means 2 and the axis movement data selection means 6. The result of the movement route determined by the area determination unit 2 is the movement route storage unit 3
Is input to and stored in, and when the moving path has a closed loop, it is deleted by the closed loop moving path deleting means 4. The movement path from which the closed loop has been deleted by the closed loop movement path deletion means 4 is input to the evacuation / reentry axis movement data generation means 5 and is input and selected to the axis movement data selection means 6 together with the evacuation external signal and the reentry external signal. The data is transmitted to the axis movement control means 7.

With such a configuration, its operation will be described with reference to the flowchart of FIG.

First, the numerical control program is decoded by the numerical control program decoding means 1 (step S1), axis movement data and the like are generated and transmitted to the axis movement data selection means 6 and the area determination means 2. The area judging means 2 judges whether or not the generated axis movement data is within the specified area (step S
2) If the axis movement data is within the designated area, the movement path storage means 3 is input and stored (step S3).
3) The read movement path is input to the closed loop movement path deletion means 4, and if there is a closed loop, it is deleted (step S4). In the example of FIGS. 3 and 4, the routes after the moving routes b to c are in the designated area, and the moving route storage means 3 is moved by the data as shown in FIGS. 6 to 8, for example. The route is stored. When the closed-loop moving path is stored in the moving-path storing means 3, for example, when the closed-loop data is between (X _c , Z _c ) to (X _f , Z _f ) in FIG. The moving route deleting means 4 deletes the closed loop data as shown in FIG.

After the closed loop is determined and deleted by the closed loop movement route deleting means 4, or when the movement route is determined to be outside the designated region in the area determination in step S2, a save external signal or a re-entry external signal is output. It is determined whether or not an external signal is input (step S5). And, for example, the fourth
When an evacuation external signal is input at the point h in the figure, the evacuation / reentry axis movement data generation means 5 saves the evacuation axis movement data at the points H → g → f → b according to the movement path data in FIG. When a generation signal and then a re-entry external signal are input, similarly, re-entry axis movement data of points b → f → g → h are generated (step S7). When there is no external signal, the axis movement data selection means 6 selects the axis movement data according to a normal numerical control program (step S6), and when there is the above-mentioned evacuation or re-entry external signal, the evacuation / re-entry generated. The input axis movement data is selected (step S8) and sent to the axis movement control means 7 to control the axis movement.

6 to 9 show examples of the stored data in the axis movement path storage means 3, and FIG. 6 shows that the program shown in FIG. It shows the contents when it is done. Further, FIG. 7 shows the contents of the result of deleting the closed loop movement route data when the movement route storing means 3 stores the closed loop movement route, and FIG. 8 shows the contents after FIG. The contents of the movement route storage means 3 until an external signal is input are shown.

(Effects of the Invention) As described above, according to the method for determining the evacuation / reentry path in the numerical control device of the present invention, the optimal evacuation / reentry operation avoidance path for abnormality processing is automatically generated for avoiding an abnormal situation. Since it can be generated automatically, it is possible to realize highly reliable and economical work machining without complicating the numerical control program.

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an example of an apparatus for realizing the method of the present invention, FIG. 2 is a flow chart showing an operation example of the present invention, and FIG. 3 is a diagram showing an example of a numerical control program used for explaining the present invention. FIG. 4 is a diagram showing an example of a moving route of a numerical control program, FIG. 5 is a route diagram of evacuation / reentry for abnormality processing in the examples of FIGS. 3 and 4, and FIGS. FIG. 3 is a diagram showing an example of data stored in a moving route storage means. 1 ... Numerical control program decoding means, 2 ... Area determination means, 3 ... Moving path storing means, 4 ... Closed loop moving path deleting means, 5 ... Retract / reentry axis moving data generating means, 6
...... Axis movement data selection means, 7 ...... Axis movement control means.

Claims (1)

[Claims] 1. A method of deciding an evacuation / reentry path in a numerical controller for executing numerical control processing based on a numerical control program, controlling a machine by the processing, and causing a work to perform machining according to a command. Evacuation for error handling /
An area that requires reentry operation is set, the moving path that entered the area is stored during execution of the numerical control program, and if the moving path has a closed loop, the closed loop is deleted. When the evacuation / reentry external signal requesting abnormal processing is input, the evacuation / reentry route is automatically determined based on the stored travel route. A method for determining a retreat / reentry route in a control device.