JPS6320601A - Numerical controller - Google Patents

Abstract

PURPOSE:To considerably shorten the program generation time and easily check programs by converting the move command on a cylinder side face to a move command on a cylinder coordinate system and performing the cutting work by simultaneous three-axis interpolation. CONSTITUTION:When a cylinder plane select command is inputted, a move command Y, Z on a rectangular coordinate system on a developed plane from a working program 1 is inputted to an interpolating circuit 3 to obtain coordinate values YN and ZN after an interpolation unit time DELTAT. These coordinate values are converted to cylinder coordinate values ZN and CN in a coordinate converting circuit 11 in accordance with formulas 1 and 2. Differences between these coordinate values and preceding values ZN1 and CN1 are obtained by an axis movement extent calculating circuit 5, and extents DELTAZ and DELTAC of movement per the interpolation unit time DELTAT for respective axes are calculated in accordance with equations 3 and 4. These results are given to an axial movement extent output circuit 5, and pulses are outputted from a pulse distributing circuit 6 which receives the output of the circuit 5, and a servo unit 7 is operated by these pulses to drive a motor 8. A detector 9 detects the extent of displacement of the motor and feeds back it to the servo unit 7 to drive it by a prescribed extent.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application J This issue 191 covers numerical control devices, 4. ) is a rotational axis and two straight axes perpendicular to the rotational axis are 41
This invention relates to a numerical control device for performing the addition of a cylindrical side face l- by a compound machine tool which performs the following operations using a movement command of a coordinate system of a face l2 which is an expanded cylinder side face.

[Current Technology J] Conventionally, this type of 11-value control device is shown in Fig. 4 (where (1) is a weighted program, (2)
is a control circuit that inputs this addition program (+), and is composed of an interpolation circuit (3) and an axis movement calculation circuit (4).
(5) is the axis movement amount output circuit, (6) is the pulse distribution circuit,
(7) indicates two servo units, (8) a motor, (9) a detection type, and (1O) one machine tool such as a lathe. Figure 5 (
If a) and (b) are explained below, the operation will be as follows.

When we want to add the curve H of the cylindrical side surface I, first, the progera L. Divide the curve of J+<Kaikoku 1- into minute II'r line commands; l;
Decompose into f line sleeve 0 movement command and force 11 lower program (1)
Create.

Next, this pressurized progera f, (1) is connected to the control circuit (2)
Enter. In the control circuit (2), the interpolation circuit (3) calculates the coordinate value after the interpolation unit time T from the movement command of each minute block, and the next axis movement calculation circuit (4) calculates the difference from the previous value. Movement 1 per interpolation median time ΔT for each wholesale 1
Calculate 11.

These results are sent to the axis movement amount output circuit (5), and pulses are output from the pulse distribution circuit (6) that receives the output of this axis movement amount output circuit (5), and the pulses are used to control the servo unit (7). is activated to drive the motor (8).

The detector (9) detects the displacement i+) of the motor (8) and feeds it back to the servo unit (7) to perform a predetermined movement. Pressure can be applied.

[Problems to be Solved by the Invention] In a conventional numerical control device for controlling such a lathe, when it is desired to load the side surface of a cylindrical workpiece, it is necessary to ',r:'+I ?The movement command of each small bronc is circle t1) The rotation of the coordinate system. 1
, itl+ and II′IVj-axis movement commands must be converted into movement commands. 1.11 It is always complicated; a huge amount of programming becomes 6 yellow, and there are problems such as long intervals between program creation screens and difficult program checking [, v was there.

This invention was made to solve the problems described in 1. Normally, when pressurizing the side surface of a cylinder with a machine tool having a control axis of a cylindrical coordinate system, the bottom surface of the side surface of the cylinder is What is a numerical control device that can perform machining by defining and converting movement commands programmed in iI'1iL- into movement commands in a cylindrical coordinate system? 1) To [
1 target.

[P-stage for solving the L problem] The number & i control device according to the present invention moves the cylinder between the buckets based on the movement command on the 4i plane, which is the expanded cylinder side surface, which is input from the progera t. An interpolation circuit that calculates the yP-target value after several hours, and a coordinate conversion circuit that converts the coordinate value into cylindrical coordinates (++'i) are provided, and the converted cylindrical coordinates A and the previously converted cylindrical coordinates are provided. Based on the difference with the value, the movement amount of the interpolated intermediate time dust for each axis is detected by the axis movement calculation circuit, and the cutting layer T is calculated by coplanar two-axis interpolation of the rotary axis and the linear axis. It is.

[Operation] In the numerical control device according to the present invention, the coordinate conversion circuit converts the side surface of the cylindrical workpiece after an interpolation unit time based on the movement command of the orthogonal I+ reference system set as data on the surface where the side surface is developed. The output of the interpolation circuit for determining the coordinate values of is input, and the output is converted into coordinate values of the cylindrical coordinate system 1- suitable for the control axis of the machine tool and output to the axis movement j11 calculation circuit.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure shows a configuration according to an embodiment of the present invention corresponding to the conventional example shown in FIG. An interpolation circuit (3) that calculates the coordinate t1 after the interpolation unit time based on a movement command on the top surface with the side surface expanded; and a coordinate conversion circuit (11) that converts the above coordinate area into cylindrical coordinate values; The cylindrical seat pi! An axis movement amount calculation circuit that calculates the movement amount per interpolation median time for each axis (l) based on the difference between the cylindrical coordinates (a) and (b) that have been converted 1 and 1i times.
4), converts a movement command on the cylinder side surface into a movement command in the cylindrical coordinate system and simultaneously performs 3411I? The cutting pressure is applied more between the IOs. The configuration of the area is the same as in the conventional example.

In addition, Fig. 2.3 shows a workpiece W to be cut by a three-axis MS having linear axes X and Z perpendicular to the rotation axis C, where 0 is the origin of the coordinate system (cylindrical coordinate system) of the programming button of the lathe. , and each point is found in the circular t51 coordinate system (R, Z, C). And the tool is at the starting point S (Rs, Zs, C:s)
, and if you want one tool to move on the arc SE as shown in Figure 3, the side you want to cut (゛t
Assuming a plane that expands the plane R), define this plane by two axes, the virtual linear axis Y, and simply command the above SE on this plane '2 to calculate z, CIkIl inside the numerical controller. The arc SEL is interpolated and controlled so that both arcs SEL move.

At this time, the origin of the orthogonal coordinate system of the virtual plane is a point (R, 0, 0) on the cylindrical coordinate system.

When cutting along the arc SE on the side surface of the workpiece W, first, the orthogonal coordinate system is created using a normal interpolation method using a movement command given in the orthogonal coordinate system (Y-Z) on the plane where the side surface is developed. Find the coordinate values (YN, ZN) of

Next, the coordinate values of this orthogonal coordinate system E are converted into coordinate values of the cylindrical coordinate system using the following equation.

ZN=ZN...(1)CM=Y
N/R・180/π...(2) With this, if the r tool moves in the Z and C axis directions by ΔZ and ΔC, the tool will move along the arc S.
It is possible to move along Eh and realize a predetermined processing.

Next, specific operations will be explained. When the cylindrical surface selection finger '''GIG°'' is input, the machining program (1)
The movement commands Y and Z in the orthogonal coordinate system with respect to the developed work surface are input to the interpolation circuit (3), and after the interpolation unit time Δτ, the coordinates Y and Z are input to the interpolation circuit (3).
N and ZN are required.

Next, these coordinate values are converted into the above (
1) and (2) on the cylindrical coordinate system: converted to Z+, CN. SoL Te441+ '4'j-motion jI: Calculation r
++] road (5) Te+i+ f”l Find the difference between Neu direct ZN1 and N+ and ΔZ=ZsZN1...(3) Δ C=C
NCN+...
(Movement variation ΔZ per interpolated median time ΔT for each of the four cars
.

ΔC is calculated using equations (3) and (4) above. Convert these results to the axis movement amount output circuit (5) and this axis movement 11!
A pulse is output from the pulse distribution circuit (6) which receives the output from the output circuit (5), and this pulse is used to control the servo unit (7).
) to drive the motor (8).

The detector (9) detects a displacement of the motor (8) and feeds it back to the servo unit (7) to drive it by a predetermined amount. As a result, the workpiece is cut along the commanded path on the cylindrical side surface.

In the above embodiment, "G16" is used as the cylinder side selection command.
”, but other unused G codes etc. can also be used.

[Effects of the Invention] As described above, according to the present invention, when a cylinder side is loaded, a machining program can be programmed in a rectangular coordinate system on a plane in which the cylinder side surface is expanded, and programming is facilitated. This has the effect of greatly reducing time and making it easier to check programs.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of the setting of a plane in which the side surface of a workpiece is developed, and FIG. 3 is an explanatory diagram of cutting and cutting the workpiece. FIG. 4 is a block configuration diagram showing the control process configuration of a conventional numerical control device, and FIGS. 5(a) and 5(t) are explanatory diagrams of conventional machining of a workpiece. In the figure, C is a rotation axis, X and Z are two linear axes, Y is a temporary linear axis, (3) is an interpolation circuit, (4) is an axis movement amount calculation circuit, and (11) is a coordinate conversion circuit. In each figure, the same reference numerals indicate the same or Japanese names. Agent Masuo Oiwa Figure 2 14ReFl□jit1%jLfC! t Figure 3 Figure 5 Procedural amendment (voluntary) Showa year, month, day 2, Due to the name of the invention (11'i control device 3, relationship with the case of the person making the amendment Patent applicant's address Marunouchi, Chiyoda-ku, Tokyo) 2-2-3 Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4, Agent address 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo, 1fflli +'; Detailed explanation of the invention 1) column,
and 14 sides. 6. Contents of supplementary IF (1) Specification, 1: The description "program" on page 2, line 17 is corrected to "programmer." (2) Specification, 1; The word “detection” and precept in the second line of page 5 are amended to “calculation”. (3) The word “the place” in the seventh line of page six of the specification is amended to “calculation”.
"Other" is corrected. (4) “Can be used” on page 8, line 18 of the specification
The statement "can also be used" will be amended to read "can also be used." (5) Correct the third figure in the drawing as shown in the attached sheet. 7.Attachment 1 or more catalog drawings of Category 9 District 3

Claims (1)

[Claims] A rotation axis and straight lines 2 that are perpendicular to the rotation axis and orthogonal to each other.
In a numerical control device that controls a complex multi-axis machine tool with axes, coordinate values after an interpolation unit time are determined based on movement commands on a plane that expands the side surface of a cylindrical workpiece input from a machining program. an interpolation circuit; a coordinate conversion circuit that converts the coordinate values into cylindrical coordinate values; and the interpolation unit time for each axis based on the difference between the converted cylindrical coordinate value and the previously converted cylindrical coordinate value. A numerical control device comprising an axis movement amount calculation circuit that calculates the amount of movement per hit, converting a movement command on a cylindrical side surface into a movement command in a cylindrical coordinate system, and performing cutting processing by simultaneous three-axis interpolation.