JP2837927B2 - Numerical control device with a function to display the trajectory of the rotation axis - Google Patents

Description

The present invention relates to a numerical controller having a trajectory display function,
In particular, the present invention relates to a numerical control device having a function of displaying a locus of a rotation axis.

[Related Art] In recent years, the development of a device for automatically controlling a machine tool or the like based on programmed information has been established as an industrially important field. Therefore, the operation of the conventional numerical control device having a locus display function will be described below.

FIG. 7 is a block diagram showing one embodiment of a conventional trajectory display device.

The apparatus includes a part program 1, a part program reading / analyzing unit 2, an axis command control unit 3, a function generating unit 7, a graphic drawing control unit 9, a coordinate system setting unit 4, and a CRT display unit 10. Have been.

The part program reading and analysis unit 2 is the
Is read and analyzed, and a command necessary for axis control is output from the part program 1 to the axis command control unit 3. The axis command controller 3 outputs axis commands necessary for axis movement of each axis to the function generator 7 based on the commands. Function generator 7 calculates the position command value D _x linear axes per unit time according to the axis command passed from said axis command control unit 3. On the other hand, the coordinate system setting unit 4 sets a linear axis as a horizontal axis and a vertical axis of a coordinate system (hereinafter, referred to as a graphic coordinate system) for displaying a trajectory (for example, an X axis as a horizontal axis and a Y axis as a vertical axis). set to) graphic drawing control unit 9 trajectory drawn according to the position command value D _x linear axes calculated by the function generator 7 on the graphic coordinate system. The CRT display unit 10 actually displays the trace drawing on the CRT.

FIG. 5 shows a cylindrical side processing (A axis) using a rotation axis (A axis).
2 shows an example of processing for performing a circular interpolation operation on the XA axis plane after the rotation of the shaft. FIG. 6 shows an example of a trajectory display according to the prior art of the machining. In this way, when the linear axis is set in the graphic coordinate system, the rotation axis component cannot be represented, so the trajectory on the side surface of the cylinder is displayed. Can not do it.

[Problems to be Solved by the Invention] In the numerical control device described above, when the machining of the cylindrical side surface using the rotation axis is programmed, when the machining by the program is displayed as a trajectory, the operation of the rotation axis is displayed on the graphic coordinate system. Because of this, the operator had to actually run the machine tool to test the program. Therefore, there is a disadvantage that it takes time to test the program. Further, if there is a defect in the machining program, it is a factor that causes a defect in the workpiece.

The present invention has been made under the circumstances described above,
An object of the present invention is to set a coordinate system in which a cylindrical side surface formed by two axes of a rotation axis of a numerical control device and a linear axis parallel to the center axis of the rotation axis is developed on a plane as a coordinate system for locus display. It is an object of the present invention to provide a numerical control device having a feature of displaying a locus of a rotation axis.

[Means for Solving the Problems] Parameter setting means for setting a parameter indicating whether the rotation axis is to be applied to the horizontal axis or the vertical axis of the coordinate system of the trajectory display, and from the center axis of the rotation axis to the machining surface The coordinates for converting the rotation axis into a linear axis according to the conversion coefficient calculated based on the distance of, and setting the coordinate system obtained by expanding the cylindrical side surface to a plane according to the coordinate axis allocation determined from the parameters as the coordinate system for the locus display. This is achieved by providing system setting means and trajectory display means for displaying a trajectory of a tool on the coordinate system of the set trajectory display.

[Operation] The method of displaying the trajectory of a rotating shaft according to the present invention is a coordinate system in which a cylindrical side surface formed by two axes of a rotating shaft of a numerical control device and a linear axis moving in parallel with the center axis of the rotating shaft is developed on a plane. Since the system is a graphic coordinate system, it is possible to easily display the trajectory of the machining curved surface, and thus it is possible to efficiently test the machining program.

Example An example of the present invention will be described below.

FIG. 1 is a block diagram showing an embodiment of a numerical control device having a function of displaying a locus of a rotating shaft according to the present invention.

The apparatus includes a part program 1, a part program read / analysis unit 2, an axis command control unit 3, a function generation unit 7, an axis command value conversion unit 8, a graphic drawing control unit 9, a terminal 12, a circular radius Storage unit 5, coordinate axis conversion coefficient calculation unit 6, parameter storage unit 11, coordinate system setting unit 4, CR
And a T display unit 10.

Part program 1 is part program reading and analysis unit 2
Is read and analyzed. The part program read / analysis unit 2 outputs a command necessary for axis control from the part program to the axis command control unit 3. The axis command controller 3 outputs axis commands necessary for axis movement of each axis to the function generator 7 based on the commands. On the other hand, parameters (contents of which will be described later) that determine the coordinate system of the trajectory display are input from a terminal operated by the operator and stored in the parameter storage unit 11. The coordinate system setting unit 4 determines the horizontal axis and the vertical axis of the graphic coordinate system based on the parameters. Further, the distance from the center axis of the rotating shaft to the processing surface, that is, the cylinder radius R is input from the terminal 12 operated by the operator and stored in the cylinder radius storage unit 5.

The coordinate axis conversion coefficient calculation unit 6 obtains a coordinate axis conversion coefficient for converting the coordinate value of the rotation axis into the coordinate value of the linear axis from the cylinder radius R. The coordinate axis conversion coefficient a is obtained as in equation (2).

Function generator 7 calculates the position command value D _x angle command value θ or linear axis of the rotary shaft per unit time according to the axis command output from the axis command control unit 3. Axis command value converter 8
Is the angle axis conversion coefficient a
Equation (3) based on, converts the position command value D _a linear axis.

D _a = a · θ (3) The graphic drawing control unit 9 draws a locus on the graphic coordinate system set by the coordinate system setting unit 4 according to the position command values. The CRT display unit 10 actually displays the trace drawing on the CRT.

FIG. 2 shows an example of a flowchart showing the flow of the operation of the device of the present invention. If the axis command is a rotation axis command determination S1 (S1 corresponds to the axis command control unit 3) and is determined to be a rotation axis command, the axis command is shifted to S2 (S2 corresponds to the coordinate system setting unit 4) in the graphic coordinate system. Determine the axis and the vertical axis. In S3 (S3 corresponds to the coordinate axis conversion coefficient calculation unit 6), the coordinate axis conversion coefficient a is obtained from the cylindrical radius R. In S4, a function is generated for each axis based on the axis command. For each axis determined to be a rotating axis in S5, the position command value D _{a of the} linear axis is determined based on the coordinate axis conversion coefficient a in S6 each time.
(S5 and S6 correspond to the axis command value converter 8)
Until it is determined in S8 that function generation for all axes has been completed (S4, S8)
Corresponds to the function generator 7, and S7 (S7 corresponds to the graphic drawing controller 9) performs graphic drawing according to the position command value of each axis.

FIG. 3 shows the difference between the graphic coordinate system when the rotation direction of the rotation axis is the normal rotation of ISO and the case of reverse rotation. (In the figure, the rotation axis is specified as the A axis. However, the same applies to other rotation axes.
Only the axis will be described. The same applies to FIG. ) When a part program as shown there is specified on the program coordinate system as shown in Fig. 3-1, the developed view of the actual machined surface on the machine tool shows the case where the rotation direction of the rotation axis is ISO normal rotation. Is shown in FIG. 3-2, and in the case of reverse rotation, FIG.
-3. Therefore, in order to draw each trajectory display in accordance with the actual machining shape, the graphic coordinate system must be taken as shown in FIGS. 3-4 and 3-5.

FIG. 4 shows a graphic coordinate system according to a difference between a program coordinate system when the development plane shown in FIG. 4-3 is viewed from the tool side and a program coordinate system when viewed from the opposite side of the tool. It shows the difference. FIG.
Considering the development view of the actual machined surface of the machine tool when the rotation direction of the rotation axis is the ISO normal rotation as shown in -3, if a part program similar to that in FIG. Fig. 4-1 when viewed from the tool side of the plane, and Fig. 4-2 when viewed from the opposite side of the tool. At this time,
In order to draw the locus display with an image similar to that of FIG. 4-1 or FIG.
4, must be taken as shown in Fig. 4-5.

In this way, the way of setting the coordinate axes of the graphic coordinate system changes depending on the direction of rotation of the rotation axis and the way of setting the coordinate system when building a program.
When setting the graphic coordinate system, specify whether to assign the rotation axis to the horizontal axis or the vertical axis of the locus display coordinate system.
There is provided a means for displaying a trajectory with an image intended by the operator by setting the parameters. Also, in the block diagram of FIG. 1, a method in which the operator inputs the parameter directly from the terminal 12 to the parameter storage unit 11 is shown, but the parameter is incorporated into the part program 1 and read and analyzed by the part program read / analysis unit 2 to store the parameter. It is also possible to store it in the unit 11.

[Effects of the Invention] Even in cylindrical side machining, the trajectory can be displayed in a form developed on a plane, and the machining shape can be visually confirmed, so that the operation test of the machining program becomes easy,
Program mistakes and cutting mistakes can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the apparatus of the present invention, and FIG. FIG. 3-1 shows the difference between the graphic coordinate systems in the case of rotation, and FIG.
The coordinate system of the machine tool in the case of forward rotation of ISO, FIG. 3-3 is the coordinate system of the machine tool in the case of reverse rotation, and FIGS. 3-4 and 3-5 are the cases of FIGS. 3-2 and 3-3, respectively. Fig. 4 shows the difference between the graphic coordinate systems depending on how the coordinate system is set when the program is assembled. Fig. 4-1 shows the development plane of Fig. 4-3 as viewed from the tool side. FIG. 4-2 is a program coordinate system when the development plane of FIG. 4-3 is viewed from the opposite side of the tool, and FIG.
Machine tool coordinate system in case of ISO forward rotation, Fig. 4-4, Fig. 4
-5 is a graphic coordinate system in the case of FIGS. 4-1 and 4-2, respectively. FIG. 5 is an example of cylindrical side processing using a rotating shaft. FIG. 6 is a conventional cylindrical side processing of FIG. FIG. 7 is a block diagram showing an embodiment of a trajectory display device according to the prior art. DESCRIPTION OF SYMBOLS 1 ... Part program 2 ... Part program reading analysis part 3 ... Axis command control part 4 ... Coordinate system setting part 5 ... Cylinder radius storage part 6 ... Coordinate axis conversion coefficient calculation part 7 ... Function generation part 8 ... ... Axis command value converter 9 ... Graphic drawing controller 10 ... CRT display unit 11 ... Parameter storage unit 12 ... Terminal

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G05B 19/4061-19/4069 G05B 19/4093 G05B 19/4097

Claims (1)

(57) [Claims] 1. A numerical controller having a locus display function on a cylindrical side surface comprising a rotation axis of the numerical controller and two linear axes moving in parallel with the center axis of the rotation axis. Parameter setting means for setting a parameter indicating whether the axis is to be applied to the horizontal axis or the vertical axis of the coordinate system of the trajectory display; and a conversion coefficient calculated based on the distance from the center axis of the rotation axis to the processing surface. Therefore, a coordinate system setting means for converting the rotation axis into a linear axis, and setting a coordinate system in which the cylindrical side surface is developed on a plane in accordance with the coordinate axis assignment determined from the parameter, as a coordinate system for trajectory display, And a trajectory display means for displaying a trajectory of the tool on the coordinate system of the trajectory display, wherein the numerical controller is provided with a trajectory display function of a rotary axis, wherein the trajectory display includes a rotary axis component.