JPH02279250A - Simultaneous two spindle interpolation control under simultaneous one spindle control by manual handle intervention - Google Patents

Abstract

PURPOSE:To carry out simultaneous two spindle interpolation by coupling a first one of required simultaneous two spindle to a manual handle while coupling the second one of them to a servomotor, and by controlling the movement of the second one which is computed in accordance with a movement of the first one by the manual handle. CONSTITUTION:If a workpiece W has a surface to be obliquely machined, a programing is made for a linearly interpolated section between start and terminal coordinates P1, P2 with respects to the tool center coordinates P1A, P2A, prior to simultaneous one spindle control. Then, a control section 200 starts machining from a surface (a) to be linearly machined in accordance with a manipulation order at a manipulation box, and reads the linearly interpolating program, previously, before the tool reaching the coordinate P1A. When the tool reaches the coordinate P1A, it automatically stops, and the manipulation box 100 displays thereon the present positions on X- to Z-axes, and an axis to be subjected to manual intervention, a turning direction of a handle and coordinates to be reached. Further, when, for example, a table 600a is moved by means of an X axis manual handle 800a, feed-back is made through the intermediary of a scale 700a, and follow-up control is made for a Y-axis saddle 600b through the intermediary of a controller 200, a servoamplifier 500, a change-over circuit 400 and a servomotor.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention allows one simultaneous single-axis control device to drive each control axis simultaneously for two or more drive shaft motors via a switching device. The present invention relates to a two-dimensional interpolation control method in which a control unit of a one-axis control device performs movement control while calculating other axis movements in response to one-axis movement by manual handle operation in a machine tool.

"Prior art and problems" Machine tools that have two or more control axes and a control device for simultaneous one-axis control can basically only perform straight-line cutting because of simultaneous one-axis control. When the machined surface has a diagonal or arcuate part, this has been dealt with either by manufacturing a special jig or by transferring it to a machine tool equipped with an NC control device that has linear and lining interpolation functions.

Furthermore, as a means to eliminate the above-mentioned complexity, when cutting an oblique or circular arc part, a line segment of about 0.1 mm (X,
In the Y plane, there is a method of dividing the line into X and Y axis line segments and sequentially switching each axis. This method requires a complicated program as shown in FIG. Cutting speed is sacrificed due to axis switching time constraints, and efficient cutting cannot be expected.

[X1 Problem and Means to be Solved] The present invention provides a simple means for simultaneous two-axis interpolation control for machining surfaces of diagonal or arcuate portions of workpieces, which is a problem in machine tools equipped with control devices for simultaneous one-axis control. The purpose of this study is to provide a new modified simultaneous two-axis interpolation control method that can be used.

In other words, in a machine tool where one simultaneous single-axis control device drives each control axis simultaneously via a switch for two or more drive shaft motors, one of the required two simultaneous axes must be driven manually. It is directly connected to the handle, and the remaining one axis is directly connected to the servo amplifier and servo motor, and in response to movement of one axis by manual handle operation, the control unit of the one-axis control device simultaneously controls the movement while calculating the movement of other axes. This is an axis interpolation control method. This makes it possible to perform diagonal cutting and circular arc cutting with simple single-axis intervention using a manual handle.

"Example" Fig. 1 is a block diagram showing a control system implementing the simultaneous two-axis interpolation control method of the present invention, Fig. 2 is a diagram showing an example of diagonal cutting,
FIG. 3 is a screen diagram showing an example of screen display, FIG. 4 is a line diagram showing an example of arc cutting, and FIG. 5 is a cutting control explanatory diagram showing a conventional example.

In Fig. 1, 100 is an operation box with a display panel for displaying positions and instructing operation procedures, and switches for data input, 200 is a control unit equipped with an interpolation calculation function and a deviation counter, and 300 is a servo amplifier, which is a control unit. Commands from and each pulse encoder PEX,
A motor driving force is output based on the rotational position and speed signals of the motor rotor obtained through a switch 300a that receives and switches feedback signals from PEY and PE2. A switching circuit 400 switches and transmits command power from one servo amplifier 300 to the servo motors MX, MY, and MZ of each axis, and opens and closes each relay contact in response to a control command from the program controller 500. 600a, 600
b and 600c are tables, saddles, and heads that are movable bodies for each axis driven by servo motors MX, MY, and MZ, and their movement amounts are determined by scales (detectors) 700a and 70Q.
b, 700c. Each table, saddle, and head are manually operated by a manual handle 800, and their movement positions are sent from the scale to the control unit 200. 900a, 900b, and 900c are brake members for braking and axis ramps for each axis, which are energized by a braking command from the program controller 500. Note that the program controller 500 centrally controls each member.

First, an example of diagonal cutting shown in FIG. 2 will be explained.

As shown in the figure, the workpiece W has an obliquely machined surface.

Prior to automatic operation of simultaneous l-axis control, start point coordinates PI (X□+'In) and end point coordinates P2 (X2#y
t) is programmed in the fallen tree G code (GIOI). The tool center coordinates at this time are P I
A, P 2A.

Next, in automatic operation with simultaneous single-axis control, machining is started from the linear machining surface (A) of the workpiece W parallel to the Y-axis. and,
Before the tool approaches the tool center coordinate PIA, the controller reads G101 in advance and performs PIA including tool radius correction.
Calculate points automatically. In response to this result, when the tool reaches the tool center coordinate PIA, the machine tool is automatically stopped and the screen shown in FIG. 3 is displayed on the display panel of the operation box. In the screen, 101, 102, and 103 indicate the current positions of the X, Y, and Z axes, 104 indicates the axis that requires manual intervention, and 105 indicates the direction of rotation of the handle. 106 displays the target coordinate position of the axis to be manually intervened (the next block is read in advance and the result of automatically calculating the geometric position including tool radius correction is displayed). The above display shows that the Y-axis servo motor MY is automatically connected to the servo amplifier 300, and the
This means that the table 600a should be moved to the left of the X-axis using the manual handle on the axis.

When such a state occurs, the operator slowly moves the daple 600a to the left of the X-axis using the X-axis manual handle while looking at the X-axis display . . . xso, ooo on the display panel. The X-axis position feedback pulse is now sent to the control unit 200. The control unit 200 receives this feedback pulse,
The amount of movement on the Y axis to obtain the shape of the predetermined obliquely machined surface (b) is calculated, and the results are sent to the servo amplifier every moment. Therefore.

The Y-axis will be automatically controlled by a servo motor,
Since the Y-axis moves with the movement of the manual handle on the X-axis, a predetermined composite shape "oblique machined surface (b)" is formed. In this way, the operator continues to rotate the handle while monitoring the cutting state fR until the position display coordinates match the target coordinate position P2A, and when they match, pull out the handle, press the cycle start button, and start the next machining surface ( We will move on to c) automatic processing.

Next, an example of arc cutting will be explained with reference to FIG.

As shown in the figure, the workpiece W has a circular arc machined surface.

Prior to automatic operation of simultaneous one-axis control, the starting point position 1i11P1 (Xxt yt) and end point coordinate P2 (xz
The circular interpolation interval of wy2) and the radius of curvature r of the circular arc are programmed in the G code (G102), for example. The tool center coordinates at this time are PIA and P2A.

Next, the linear machining surface (a) of the workpiece W parallel to the Y-axis is machined by automatic operation under simultaneous single-axis control.

And before the tool approaches the tool center coordinate PIA.

The controller (roller reads G101 in advance and automatically calculates the P point including tool diameter correction. Based on this result,
When the tool reaches the tool center seat IF'lA, the machine tool is automatically stopped and the screen shown in Figure 3 is displayed on the display panel of the operation box.7 The control unit 200 reads 0102, and the machine tool is automatically stopped and the operation is started. The screen shown in FIG. 3 is displayed on the display panel of the box as in the case of the diagonal processing described above.

In the above state, Y@servo motor MY is connected to servo amplifier 30.
Automatically connects to table 600 using the X-axis manual handle.
This means moving a to the left of the X axis.

When such a state occurs, the operator slowly moves the table 600a to the left of the X-axis using the X-axis manual handle while looking at the X-axis display...X 50 , 000 on the display panel. The X-axis position feedback pulse is now sent to the control unit 200. The control unit 200 receives this feedback pulse, calculates the amount of movement on the Y axis to obtain the shape of the predetermined arc-machined surface (b), and instructs the servo amplifier to receive the result from time to time. Therefore.

The Y-axis will be automatically controlled by a servo motor,
Since the Y-axis moves with the movement of the manual handle on the X-axis, two predetermined composite shapes "arc-machined surfaces (b)" are formed. The operator continues rotating the handle while changing the cutting state until the position display coordinates match the target coordinate position P2A, then pulls out the handle when they match, presses the cycle start button, and starts the next machining surface. (
We will move on to c) automatic processing.

” In the two-legged embodiment, the X-axis is the intervention axis of the manual handle, and the Y-axis is the intervention axis of the manual handle.
Although the axis has been described as a control axis that is automatically controlled by a servo motor, any axis may be used as the control axis, and it is preferable that the axis with a large amount of movement be used as the intervention axis of the manual handle.

"Effect" According to the present invention, one of the required two simultaneous axes is directly connected to the manual handle, and the remaining one axis is directly connected to the servo amplifier and servo motor, supporting single-axis movement by manual handle operation. Since the control unit of the 1-axis control device performs movement control while performing other axis movement calculations, the simultaneous 2m movement of the diagonal or circular arc portion of the workpiece is a problem in machine tools with simultaneous 1-axis control control devices. Interpolation control can be done by simple means. In addition, machining of diagonal or arcuate parts of a workpiece can be performed mainly by operating a single manual handle, allowing the operator to utilize his unique skills.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a control system implementing the simultaneous two-axis interpolation control method of the present invention, FIG. 2 is a diagram showing an example of diagonal cutting,
FIG. 3 is a screen diagram showing an example of screen display, FIG. 4 is a line diagram showing an example of arc cutting, and FIG. 5 is an explanatory diagram of cutting control showing a conventional example. Control unit, 300... Servo amplifier, PEX. PE'/, PEZ...Pulse encoder, 300a"
"Switcher, MX, MY, MZ--Servo motor, 50
0...Program controller, et OOa, 600b
, 600c ” ” ” Movable body for each axis, 700a, 70
0b, 700'e...Scale (detector), 800
...Manual handle, 9Q0a, 900b, 900c・
...Brake parts. (c)... Oblique and circular cutting surface, W... Workpiece,
PI (Xxt yx)...Starting point coordinates of diagonal and circular arc machining surfaces, P2 (Xxt yz)...End point coordinates of diagonal and circular machining surfaces, PI, A, P2A...Tool center coordinates, r... Radius of curvature of the arc.

Claims (1)

[Claims] (1) In a machine tool in which one simultaneous single-axis control device drives each control axis simultaneously via a switch for two or more drive shaft motors, the required simultaneous drive of one of the two axes is It is directly connected to the manual handle, and the remaining one axis is directly connected to the servo amplifier and servo motor, and in response to movement of one axis by manual handle operation, the control unit of the one-axis control device performs movement control while calculating the movement of other axes. A simultaneous two-axis interpolation control method for simultaneous one-axis control using manual handle intervention, characterized by: