JPH0454507A - Numerical controller containing locus display function of rotary axis - Google Patents

Abstract

PURPOSE:To facilitate a program test and to decrease the defects of a machining program and the cutting defects by using a coordinate system obtained by evolving the side face of a cylinder consisting of a rotary axis of a numerical controller and a linear axis parallel to the center axis of the controller for display of a locus. CONSTITUTION:When an axis command control part 3 decides a rotary axis command given from a part program reading/analyzing part 2, a coordinate system setting part 4 decides the horizontal and vertical axes of a graphic coordinate system. A coordinate axis conversion coefficient arithmetic part 6 obtains a coordinate axis conversion coefficient from the distance between the center axis of a rotary axis and a machining surface, i.e., the radius of a cylinder. A function generating part 7 generates the functions of each axis, and the axis decided as the rotary one by an axis command value conversion part 8 is converted into the position command value of a linear axis at each time based on the coordinate axis conversion coefficient. Then a graphic drawing control part 9 performs successively drawing operations based on the position command value of each axis until the end of generation of functions of all axes is decided at the part 7. Thus it is possible to facilitate the working test of a machining program and to decrease the program mistakes and the cutting mistakes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a numerical control device equipped with a trajectory display function, and particularly relates to a numerical control device equipped with a rotation axis trajectory display function.

[Background Art] In recent years, the development of devices that automatically control machine tools and the like based on programmed information has been established as an industrial field of application. Therefore, the operation of a conventional numerical control device equipped with a trajectory display function will be described below.

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

The device includes a part program 1, a part program reading analysis section 2, an axis command control section 3, a function generation section 7, a graphic drawing control section 9, a coordinate system setting section 4, and a CRT display section 10. has been done.

The part program reading analysis section 2 reads and analyzes the part program 1, and outputs commands necessary for axis control from the part program 1 to the axis command control section 3. Axis command control section 3
outputs axis commands necessary for axis movement of each axis to the function generating section 7 from the commands. The function generating section 7 is connected to the axis command control section 3.
The position command value D of the linear axis for each unit time is calculated according to the axis command passed from. On the other hand, the coordinate system setting unit 4 sets linear axes as the horizontal and vertical axes of a coordinate system (hereinafter referred to as graph ink coordinate system) for displaying the trajectory. (Setting) The graphic drawing control unit 9 draws a trajectory on the graphic coordinate system according to the position command value D of the linear axis calculated by the function generating unit 7. The CRT display section 10 actually displays the trajectory drawing on the CRT.

FIG. 5 shows an example of cylindrical side surface machining using a rotating axis (A-axis) (machining that performs circular interpolation on the X-A-axis plane after rotational movement of the A-axis). Figure 6 shows an example of trajectory display in the conventional technology for this processing. In this way, when the linear axis is taken as a graphic coordinate system, the rotational axis component cannot be expressed, so the trajectory of the cylinder side surface is displayed. Can not do it.

[Problems to be Solved by the Invention] In the numerical control device described above, when machining a cylindrical side surface using a rotary axis is programmed, and when the machining by the program is displayed as a trajectory, the operation of the rotary axis is displayed in a graphic coordinate system. Therefore, the operator had to test the program by actually operating the machine tool. Therefore, there was a drawback that it took time to test the program. Moreover, if there is a defect in the cannibal program, it may cause defects in the workpiece.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to flatten the cylindrical side surface formed by two axes, a rotation axis of a numerical control device and a linear axis parallel to the central axis of the rotation axis. An object of the present invention is to provide a numerical control device having a function of displaying a trajectory of a rotary axis, which is characterized in that a coordinate system expanded to a coordinate system for displaying a trajectory is used as a coordinate system for displaying a trajectory.

[Means for solving the problem] Using a conversion factor calculated based on the distance from the central axis of the rotating shaft to the machining surface, convert the rotating shaft to a linear axis.1. a setting means for setting, as a coordinate system for trajectory display, a coordinate system in which the side surface of a cylinder formed by two axes, a linear axis moving parallel to the axis, is expanded into a plane; and on the set coordinate system for trajectory display, This is achieved by providing a trajectory display means that displays the trajectory of the rotation axis.

[Operations] The method for displaying the locus of a rotary axis according to the present invention consists of a rotary axis of a numerical control device and a linear axis that moves parallel to the central axis of the rotary axis.
Since the graphic coordinate system is a coordinate system in which the cylindrical side surface formed by the axis is expanded into a plane, it is possible to easily display the locus of the machined curved surface, and therefore, it is possible to efficiently test the cannibal program.

[Example] An embodiment 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 the locus of a rotary axis according to the present invention.

The device includes a part program 1, a part program reading analysis section 2, an axis command control section 3, a function generation section 7, an axis command value conversion section 8, a graphic drawing control section 9, a terminal 12, and a cylinder radius. A storage unit 5, a coordinate axis conversion coefficient calculation unit 6, a parameter storage unit 11, a coordinate system setting unit 4,
It is composed of a CR7 display section 10.

The part program 1 is read and analyzed by a part program reading analysis section 2. The part program reading analysis section 2 outputs commands necessary for axis control from the part program to the axis command control section 3.

Based on the command, the axis command control section 3 outputs an axis command necessary for moving each axis to the function generation section 7. On the other hand, parameters (details of which will be described later) that determine the coordinate system for trajectory display are input from the terminal 12 operated by the operator and stored in the parameter storage section 11. The coordinate system setting unit 4 determines the horizontal and vertical axes of the graphic coordinate system based on the parameters. Further, the distance from the central 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 is stored in the cylinder radius storage section 5.

The coordinate axis conversion coefficient calculation unit 6 calculates the coordinate axis conversion coefficient for converting the coordinate value of the rotation axis into the coordinate value of the linear axis based on the radius R of the cylinder.
Seek more. The coordinate axis conversion coefficient a is obtained as shown in equation (2).

The function generating section 7 calculates the angle command value θ of the rotary axis or the position command value D of the linear axis for each unit time according to the axis command output from the axis command control section 3. Axis command value converter 8
is the angle command value θ of the rotation axis, and the coordinate axis conversion coefficient a
Based on this, it is converted into a linear axis position command value D according to equation (3).

D -a·θ (3) The graphic drawing control unit 9 draws a trajectory on the graphic coordinate system set by the coordinate system setting unit 4 according to these position command values. The CR7 display unit 10 actually displays the trajectory drawing on the CRT.

FIG. 2 shows an example of a flowchart showing the flow of operation of the apparatus of the present invention. If the axis command is determined to be a rotational axis command in the rotational axis command judgment 5l (Sl corresponds to the axis command control section 3), the horizontal axis of the graphic coordinate system is determined at 52 (S2 corresponds to the coordinate system setting section 4). Determine the axes and vertical axes. 53(S
3 corresponds to a coordinate axis conversion coefficient calculation unit 6), a coordinate axis conversion coefficient a is determined from the cylinder radius R. In S4, a function is generated for each axis based on the axis command, and for each axis determined to be a rotational axis in S5, it is converted into a position command value D for the linear axis based on the coordinate axis conversion coefficient a in S6 (S5, S6 corresponds to the axis command value converter 8), until it is determined in S8 that function generation for all axes has ended (S4 and S8 correspond to the function generator 7), S7 (S7 corresponds to the graphic drawing control unit 9). (equivalent) performs graphic drawing according to the position command value of each axis.

FIG. 3 shows the difference in the graphic coordinate system when the rotation direction of the rotation axis is ISO forward rotation and when it is reverse rotation. (In the figure, the axis of rotation is specified as the A axis, but the case of other rotation axes can be considered in exactly the same way, so here, A
Only the axis will be explained. The same applies to FIG. ) When a part program as shown in Figure 3-1 is commanded on the program coordinate system, the actual developed view of the machined surface on the machine tool will be as follows: For reverse rotation, see Figure 3-2.
-3. Therefore, in order to draw each locus display in accordance with the actual machining shape, graphic coordinate systems must be set as shown in FIGS. 3-4 and 3-5, respectively.

Figure 4 shows the graphic coordinate system depending on whether the program is programmed in the program coordinate system when the development plane in Figure 4-3 is viewed from the tool side or the program coordinate system when viewed from the opposite side of the tool. This shows the difference. Figure 4-
As shown in Figure 3-3, considering the developed view of the actual machined surface on a machine tool when the rotating direction of the rotation axis is ISO forward rotation, if a part program similar to that shown in Figure 3-1 is commanded, the developed plane When viewed from the tool side, it is represented as shown in Figure 4-1, and when viewed from the opposite side of the tool, it is represented as shown in Figure 4-2. At this time,
In order to draw the trajectory display in an image similar to that shown in Figure 4-1 or Figure 4-2, the graphic coordinate system should be changed to Figure 4-1 or Figure 4-2.
4. It must be taken as shown in Figure 4-5.

In this way, the way the coordinate axes of the graphic coordinate system are set changes depending on the direction of rotation of the rotation axis and the way the coordinate system is set when programming, so when setting these as parameters and setting the graph ink coordinate system, the rotation The apparatus is provided with a means for displaying a trajectory in an image intended by an operator by setting the parameter to determine whether an axis is assigned to a horizontal axis or a vertical axis of a coordinate system for displaying a trajectory.

In the block diagram of FIG. 1, a method is shown in which the operator inputs the parameters directly from the terminal 12 to the parameter storage section 11, but the parameters are incorporated into the part program 1, read and analyzed by the part program reading analysis section 2, and then stored in the parameter storage section. It is also possible to store it in the section 11.

[Effects of the invention] Even when machining a cylindrical side surface, the locus can be displayed in a flattened form, and the machining shape can be visually confirmed, making it easier to test the operation of the machining block and reducing program errors. Cutting errors, etc. can be reduced.

[Brief explanation of drawings]

Fig. 1 is a block configuration diagram showing an embodiment of the present invention, Fig. 2 is a flowchart explaining the operation of the device of the present invention, and Fig. 3 shows the rotation direction of the rotary shaft or the case of normal ISO rotation and reverse rotation. This shows the difference in graphic coordinate systems in the case of rotation. Figure 3-1 is the program coordinate system, Figure 3-2 is the machine tool coordinate system when the rotation axis is 150 degrees forward rotation, and Figure 3-3 is the reverse. The coordinate system of the machine tool in the case of rotation, Figures 3-4 and 3-5 are the graphic coordinate systems in the case of Figures 32 and 3-3, respectively, and Figure 4 is how to set the coordinate system when creating a program. Figure 4-1 shows the difference in graphic coordinate systems according to
is the program coordinate system when the development plane in Figure 4-3 is viewed from the tool side, Figure 4-2 is the program coordinate system when the development plane in Figure 4-3 is viewed from the opposite side of the tool, and Figure 4-3 is the coordinate system of the machine tool when the rotation axis rotates in the ISO forward direction, Figure 4-4,
Figure 4-5 is the graphic coordinate system for the cases of Figures 4-1 and 4-2, respectively. Figure 5 is an example of cylindrical side machining using a rotation axis. Figure 6 is the cylindrical side machining of Figure 5. FIG. 7 is a block diagram showing an example of a trajectory display device according to the prior art. 1... Part program 2... Part program reading analysis section 3...
Axis command control section 4 ... Coordinate system setting section 5 ... Cylinder radius storage section 6 ... Coordinate axis conversion coefficient calculation section 7 ... Function generation section 8 ... Axis command value conversion section 9 ... Graphic drawing Control unit 10... CRT display unit 11... Parameter storage unit 12... Terminal

Claims (2)

[Claims] (1) In a numerical control device equipped with a trajectory display function of a cylindrical side surface, which is composed of two axes: a rotation axis of the numerical control device and a linear axis that moves parallel to the central axis of the rotation axis, a setting means for converting the rotary axis into a linear axis according to a conversion coefficient calculated based on the distance from the central axis to the machined surface, and setting a coordinate system in which the cylindrical side surface is expanded into a plane as a coordinate system for displaying the trajectory; A numerical control device equipped with a rotary axis trajectory display function, characterized in that a trajectory including a rotation axis component is displayed by a trajectory display means that displays a tool trajectory on the set trajectory display coordinate system. (2) The means for setting the coordinate system for displaying the trajectory includes means for determining whether to allocate the rotation axis to either the horizontal axis or the vertical axis of the coordinate system for displaying the trajectory, based on parameters input from the outside. A numerical control device having a function of displaying a trajectory of a rotation axis according to claim (1).