JPS60129804A - Numerical controller - Google Patents

Abstract

PURPOSE:To make highly accurate processing possible even when a tool having a non-circular sectional shape is to be used, by providing a function generator and changing cutter compensation vectors generated from a correcting vector section depending upon the direction. CONSTITUTION:At an interpolation calculation device 3 a command vector (a) is calculated and an interpolation vector (c) is obtained by calculating the sum of the calculated command vector (a) and a cutter compensation vector (b). A compensation vector generating section 3b does not generate the vector (b) having a fixed size always, but generates the vector (b) having different sizes depending upon the direction which becomes points on an ellipse. Generation of the vector (b) is made in such a way that the direction intersecting the vector (a) at right angles is first found and the found direction is given to an ellipse vector generating section 5. At the generating section 5, a point on the ellipse in the found direction is obtained from the given angle and the vector size until the obtained point is returned to the compensation vector generating section 3b. The vector (b) is calculated from the direction and size thus found.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a numerical control device (hereinafter referred to as NO device) for controlling a machine tool having a non-circular tool cross-sectional shape.

[Prior art]

Conventionally, there has been a device of this type as shown in FIG.

In this figure, 1 is an NC command input device (usually a paper tape reader or internal memory), and 2 is a preprocessing calculation that changes the NC commands input from this NC command input device 1 into a format that is easy to process in subsequent processes. The device 3 is an interpolation calculation device that performs interpolation calculation for performing the movement operation 7 based on the NC command, and its interior is composed of various parts, but here we will explain only the command vector calculation unit that is related to this invention. 3a.

The correction vector generation section 3b and the interpolation vector generation section 3c+interpolation calculation section 3dK will be explained separately. 4 is an output device that outputs instructions to the machine tool based on the calculation results.

Next, the operation will be explained.

The NC command inputted by the NC command input device 1 is processed by the preprocessing calculation device 2 into a format that is easy for the machine to handle, including converting numbers from decimal to binary and setting the corresponding register for each character. It is passed to the interpolation calculation device 3.

In the interpolation calculation device 3, from the command to the given t'1, the second
The command vector a has the relationship as shown in the figure.

The tool diameter correction vector b and the interpolation vector ct' are calculated by the generation units jb and 3e, respectively. The command vector a is NC
The tool radius correction vector b is orthogonal to the command vector a, and its magnitude is determined from the amount of movement itself given during the command. : A vector that matches the tool diameter correction amount. Also, the interpolation vector c is the above two vectors a+b
The machine tool moves by this vector.

The interpolation calculation unit 3d divides the movement amount corresponding to the interpolation vector C into a large number of vectors every minute time and passes the data to the output device 4 in real time. The output device 4 outputs this vector for each minute time as a pulse command to, for example, the X- and Y-axis drive motors of a machine tool.

Since the conventional NC device is configured as described above, its tool diameter correction function is sufficient for milling using a milling machine, where the cross-sectional shape of the tool is circular. However, in laser processing machines, the cross section of the laser beam takes various shapes depending on the mode of laser oscillation and the characteristics of the optical system, and elliptical beams are often used for cutting. In the case of machines in which the wire is vibrated with an ultrasonic vibrator for the purpose of speeding up machining, etc., the tool shape can be considered as an oval shape. [R feature of the invention] This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the tool diameter correction 4! !!The amount of correction due to the function is calculated in all directions (36o0
The object of the present invention is to provide an NC device Z that can perform highly accurate machining even when using a tool with a non-circular cross-sectional shape by having a specific direction rather than a uniform λ.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a configuration diagram showing one embodiment Y of the present invention, in which 1 is an NC command input device, 2 is a preprocessing calculation device, and 3 is a block diagram showing an embodiment of the present invention.
4 is an interpolation calculation device, and 4 is an output device, which are the same as the conventional example shown in FIG. 5 is an ellipse vector generator, which calculates a vector on an ellipse at an arbitrary angle based on two given vectors that are orthogonal to each other.

The operation of this embodiment is similar to that of a conventional NC device except for the interpolation calculation device 3. In the interpolation calculation device 3, the command vector a is calculated in the same manner as before, and the sum with the tool radius correction vector b is calculated to calculate the interpolation vector C. A constant tool radius correction vector bv is not generated, but a tool radius correction vector bv whose size differs depending on the direction of the point on the ellipse is generated. In this method, first, a direction perpendicular to the command vector a is determined, and fL is given to the elliptic vector generator 5. The ellipse vector generator 5 finds a point on the ellipse in that direction from the given angle t-, and corrects the magnitude up to that point by the vector generator 3bK. The tool radius correction vector b is calculated from the direction and magnitude thus determined. Note that the values of the major axis and minor axis are set in advance in the ellipse vector generator 5.

In the above embodiment, the tool diameter correction amount is elliptical, but if the ellipse vector generator 5 is replaced with any other function generator, various irregularly shaped tools such as squares and oblongs can also be handled. Needless to say, you can get it.

In addition, the tool radius correction amount can also be specified by specifying values in two directions perpendicular to each other.
can also be set to 5 so that it is given as a component parallel to either one of the two axes.

[Effects of the Invention] As explained above, the present invention is equipped with a function generator so that the tool radius correction vector generated in the correction vector generation section differs depending on the direction. Since highly accurate tool diameter correction can be performed even for machine tools with In machines, there are advantages such as the fact that the tool diameter correction amount can be given as values in the long axis and short axis directions.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional NC device, FIG. 2 is a diagram showing the relationship between vectors used in FIG. 1, and FIG. 3 is a block diagram of an example 711i of the present invention. In the figure, 1 is an NC command input device, 2 is a preprocessing calculation device, and 3
3a is an interpolation calculation device, 3a is a command vector calculation unit, 3b is a correction vector generation unit, 3c is an interpolation vector generation unit, 3d is an interpolation calculation unit, 4 is an output device, and 5 is an ellipse vector generation unit. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent: Masuo Oiwa (2 others, Figure 1)

Claims (1)

[Scope of Claims] DJ (command vector from a command vector calculation unit and correction vector) A tool radius correction function equipped with an interpolation calculation device that generates an interpolation vector in an interpolation vector generation unit from a tool radius correction vector from a tk generation unit. 1. A numerical control device comprising: a function generator for giving a command to the correction vector generating section for giving a tool radius correction amount as having directionality. (2) The numerical value according to claim (1), characterized in that the tool diameter correction amount can be given as a component of any two axes 1C"F among the X, yty, = t'zz axes. Control device.