JPH0527124B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides numerical control that makes it easy to program the machining of cams (arc-shaped grooves), especially when machining the side surfaces of cylinders, etc., by numerical control. This relates to a control device.

[Conventional technology]

Figure 4 shows a general numerical control device used when machining cams, etc. In the figure, 1 is an input unit such as a tape reader that reads a magnetic tape etc. and inputs the information, and 2 is an input unit for an operator to use a machine tool. (not shown) an operation unit for operating and controlling the 3
is axis data such as tool movement path data based on data or commands from the input section 1 or operation section 2,
A central processing unit that calculates and outputs speed data, etc., 4
5 is a control unit that outputs command signals such as pulse distribution, spindle startup, tool exchange, etc. to a machine tool (not shown) based on the output of the central processing unit 3, that is, machine control data; This is a drive unit that drives the motor. Conventionally, in the above numerical control device, axis control data G, X,
Z, C, I, K, F and machine control data M, S, T
The control unit 4 uses the data of the interpolation control circuit 41.
performs interpolation (pulse distribution) according to the type of interpolation, and the machine control circuit 42 sets the machine control data. FIG. 7 is a simple flowchart showing the processing flow of the control section during the above processing, in which pulse distribution control is activated at step 10. For example, first in step 11, the data is read from input section 1 in FIG.
Furthermore, the central processing unit 3 performs various processes such as data error checking to normalize the input data G,
Z, C, etc. are imported. In the next steps 12 to 15, the content of the designated G data regarding the type of interpolation is determined. As a result of this judgment, for example, if the type is linear interpolation, the process proceeds to step 12a, where linear interpolation is performed based on the data taken in at step 11, and then, at step 17, the interpolation result data is transferred to the output table of the control unit 4. Set to . These data are sent to the drive unit 5
is input to drive the machine tool. In this way, conventional numerical control devices are equipped with three interpolation circuits for straight lines, circular arcs, and screws, and when an attempt is made to cut any other curve, the curve is divided into multiple minute line segments. The coordinate values of each point were programmed and inputted from the input section 1 shown in FIG. 4, and the machine was driven using the linear interpolation path of the control section 4. In addition, the device that performs the above operation can, for example, reduce the circumference of the side surface of the cylinder by 1/1.
In the case of machining a cam that performs cutting by 4, interpolation is performed using a linear axis and a rotary axis, so the interpolation is performed continuously using an interpolation circuit (not shown) built into the device, as in the case of any arbitrary curve described above. As shown in Figure 6, the area from point _A0 to point B is divided into, for example, seven parts, and each dividing point is made into _A1 , _A2 , _A3 to _A6 points, and the line between each point is replaced with a straight line. I was programming.

The contents of this program are as follows.

(1) G00 Z30 C30; Positioning at A ₀ point (2) G01 Z32 C57.6 F100;
A Straight line cutting to ₁ point (Feed: 100min/min) (3) G01 Z38 C82.8; A ₂ 〃 (4) G01 Z47 C105.3; A ₃ 〃 (5) G01 Z60 C126; A ₄ 〃 (6) G01 Z73 C138.6; A ₅ 〃 (7) G01 Z90 C149.4; A ₆ 〃 (8) G01 Z110 C153; B 〃 However, G00 and G01 specify the type of interpolation.
Z30 to Z110 are Z-axis movement distances, C30 to C153 are C-axis movement distances, that is, rotation angles, and F is feed rate data. In this way, conventional devices program by dividing the rotary axis and linear axis into minute line segments.

[Problem that the invention seeks to solve]

With conventional numerical control devices such as those mentioned above, not only are the programs long, but they also require a lot of complicated calculations to divide the curve, and a great deal of effort is required to create the programs. However, there were problems such as the finished surface being rough.

This invention was made to solve these problems, and provides a numerical control device that can machine the cam on the side of a cylinder with high accuracy using a simple program without spending much time creating a program. The purpose is to obtain.

[Means for solving problems]

The numerical control device according to the present invention interpolates the processing of the side surface of a cylinder, etc. on a planar figure, and determines the amount of displacement of the rotating shaft using a conversion circuit.

[Effect]

In this invention, the conversion circuit provided in the control unit determines the displacement amount of the rotary shaft based on the value interpolated on the planar figure of the side surface of the cylinder, etc., so the program is easy and economical.

〔Example〕

FIG. 1 is a detailed block diagram showing an embodiment of the present invention, and the same reference numerals as in FIG. 5 indicate the same or corresponding parts. In FIG. 1, among the axis-related data of the central processing unit 3, R is data indicating the radius value of the cylinder, and the conversion circuit 43 of the control unit 4
is a characteristic component of this invention, and the above R
This is a circuit that receives data and outputs the amount of displacement of the rotating shaft. Here, regarding the above displacement amount, see Figure 2A and Figure 2.
This will be explained with reference to Figure B. First, Figure 2B is a front view of a cylinder, with a 1/4 arc on its outer circumference.
A′B′ is shown. The second figure represents the arc from point A' to point B' in Figure 2B on a plane.
This is diagram A, and the diagram shows the distance from point A to point B in the C-axis direction. This corresponds to =A'B' in the front view of the rotating shaft in FIG. 2B. Also, if the angle formed by A' and B' in Figure 2B is α and the radius of the cylinder is R, then α = 2π × A'B' / 2πR = AB / R (rad), which means that In the plan view (developed view) of Figure 2A, the rotational axis C is regarded as the linear axis C', and the displacement of the rotational axis is calculated by 1/R of the C-axis component obtained by circular interpolation between the 2-linear axes. It represents what is possible.

That is, in the control section 4 in FIG. This indicates that the amount of displacement of the rotating shaft can be calculated by calculating the data. FIG. 3 is a flow diagram showing the flow of the process in FIG.
19a and 19b correspond to the steps for processing the displacement amount of the rotation axis, and when the central processing unit 3 in FIG. Interpolation 19a is performed, and the conversion circuit 43 takes in the C-axis component of the interpolation result and the R data (radius) input from the central processing unit 3 (step 19b), and sets the interpolation result in the output table. . Thereafter, the drive unit 5 automatically operates the processing machine (not shown) based on the above interpolation result.

〔Effect of the invention〕

As explained above, this invention is configured by providing the control unit with a conversion circuit that calculates the displacement amount of the rotation axis from the circularly interpolated C-axis component and the value of the radius R of the cylinder, so that cylinders etc. can be processed by numerical control. In this case, the machining program does not require a large amount of time and can be easily created, which is an economical effect.

[Brief explanation of the drawing]

FIG. 1 is a detailed block diagram of the main parts of a numerical control device showing an embodiment of the present invention, and FIGS. 2A and B illustrate an interpolation method when machining a cylindrical side surface using the numerical control device of FIG. 1. Fig. 3 is a schematic flow diagram showing the processing process in Fig. 1, Fig. 4 is a block diagram showing the general configuration of a general numerical control device, Fig. 5 is a conventional numerical control A detailed block diagram showing the main parts of the device, FIG. 6 is a plan view for explaining the interpolation method when machining the side surface of a cylinder using the numerical control device shown in FIG. 5, and FIG. 7 shows the processing process shown in FIG. 5. FIG. In the figure, 1 is an input section, 3 is a central processing section, 4 is a control section, 5 is a drive section, 41 is an interpolation control circuit, 43
is a conversion circuit. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. In a numerical control device that numerically controls the machining of a cylindrical side surface, the control unit that performs the numerical control performs biaxial interpolation on a plane in which the machining shape of the cylindrical side surface is developed into a planar figure. A numerical control device comprising: an interpolation control circuit that performs the interpolation; and a conversion circuit that receives the result of the two-axis interpolation and converts one axis of the two-axis interpolation into a displacement amount of a rotation axis.