JPS58165955A - Tail stock barrier setting and controlling method in numerically controlled lathe - Google Patents

Abstract

PURPOSE:To realize a smooth machining work by setting the tail stock barrier of a numerically controlled lathe in response to the position of a main body and the protruding quantity of a sleeve so that it can be moved freely without being fixed to a working origin continuously. CONSTITUTION:The main body 1a of a tail stock 1, a pulse generator 17 which is a position detection means of a sleeve 2, and a scale type position detector 16 are provided at the control portion of a numerically controlled lathe, and a barrier setting memory is provided storing the coordinates rectangular to the main axis 3 of reference points P0, P1...P5 when a tail stock barrier TSB is set and the positional relationship in the main axis 3 direction among the reference points provided around the sleeve and main body. Positions of the main body and sleeve in the main axis direction are detected by use of a position detection means so as to determine the coordinates of the reference points in the main axis direction, thereby the tail stock barrier TSB can be set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tailstock barrier setting control method suitable for application to a numerically controlled lathe, particularly a four-axis numerically controlled lathe.

In numerically controlled lathes, in order to prevent interference between the turret and the tailstock, a tailstock barrier is set in the space around the tailstock to surround the tailstock, and if the turret enters the barrier. In this case, the feeding operation of the tool rest is immediately stopped to prevent interference between the two.

FIG. 1 is a diagram showing a conventional method for setting a tail stock barrier, and FIG. 2 is a diagram showing the positional relationship between a workpiece and the tail stock barrier.

Conventionally, when setting the tail stock barrier T8B,
As shown in FIG. 1, a point Pl serves as a reference for the barrier T8B with respect to the processing origin ZP.

It was set by inputting the X coordinate value of P2 and the length L corresponding to the protrusion amount of the sleeve 2 of the tail stock l, but in this case, every time the protrusion amount of the sleeve 2 changes, the length L has to be set again. It was necessary to input and modify the barrier TUB. In addition, since the barrier TUB is only fixedly set in a continuous manner with the machining origin ZP, as shown in Fig. 2,
Barrier T8B could not be set at a position away from the processing origin ZP. However, with a 4-axis numerically controlled lathe,
Since the two turrets each make complicated movements in two-dimensional directions, the tail stock 7T8B cannot be set in a manner that accurately corresponds to the position of the main shaft 3, that is, the tail stock l, which is movable in the z-axis direction. However, there was a risk that the barrier TSB would obstruct the movement of the turret, or that the turret and tailstock would interfere with each other despite the presence of the barrier TSB.

In order to solve the above-mentioned drawbacks, the present invention allows the tailstock barrier to be set in a form that corresponds to the position of the tailstock body and the amount of protrusion of the sleeve, and in a form that allows it to move freely without being continuous with the 11011 origin. The object of the present invention is to provide a method for controlling the setting of a tailstock barrier in a numerically controlled lathe.

That is, the present invention provides a means for detecting the positions of the main body and the sleeve, and also detects the coordinates of the reference point in the direction perpendicular to the main axis when setting the tailstock barrier, and the mutual reference points provided around the sleeve and the main body. A barrier setting memory is provided in which the positional relationship between the main body and the sleeve in the main axis direction is determined, and the position detecting means detects the positions of the main body and the sleeve in the main axis direction to determine the coordinates of the reference point in the barrier setting memory in the main axis direction. Hereinafter, the present invention will be specifically explained based on the embodiments shown above.

FIG. 3 is a block diagram showing an example of a control part of a numerically controlled lathe to which the present invention is applied, and FIG. 4 is a schematic diagram showing an example of a chief rest stock part of a numerically controlled lathe to which the present invention is applied. . 7, the numerically controlled lathe 5, as shown in FIG.
It has a main control section 6, to which are connected a feed shaft control section 7, a comparison circuit 9, and a tail stock barrier control section IO. A plurality of feed shaft drive motors 12 are connected to the feed shaft control unit 7, which drive the tool rests 22 and 23 in the directions of arrows A, B, C, and D in FIG. 4, that is, the Z and X axes. The motor 12 is provided with a turret position detector 13 connected to the comparison circuit 9 and the feed axis control section 7. On the other hand, the tail stock barrier 'llJm section 10 includes a barrier setting memory 15 and a scale type position detection means which is a sleeve position detection means. 16 and a pulse generator 17, which is a means for checking the position of the tailstock main body, are connected to the lathe 5, as shown in FIG.
is supported so as to be movable in three main shaft directions, that is, the directions of arrows A and 13, which is the Z axis, and a screw shaft 19 with a drive motor 18 connected to one end is screwed to the main body 1a of the tail stock l. The aforementioned pulse generator 17 is connected to the drive motor 18 via the belt 20, and the pulse generator 17 is connected to the main body la via the cylinders 4a and 4b of the drive cylinder section 4, which is configured in the main body 1a and the sleeve 2. With the sleeve 2 aligned with the main shaft 3, the sleeve 2 is aligned with the arrow A,
The sleeve 2 is supported so as to be movable and driven in the Bjj direction, and a scale type position detector 1b installed in the main body 1a is connected to the sleeve 2 via an arm 2a.

Since the numerically controlled lathe 5 has the above-described configuration, the movement of the tail stock l in the Z-axis direction, that is, the arrows A and B directions, is achieved by rotating the drive motor 18 in the forward and reverse directions together with the screw and the -shaft 19. The rotation of the motor 18 is transmitted to the pulse generator 117 via the belt 20, and the pulse generator 17 causes the tail stock 1 to move in the directions of arrows A and B every time the pulse generator 18 rotates by a predetermined angle. A pulse CP is generated every time the vehicle moves by a predetermined amount and is output to the tail stock barrier control section 10.

The control unit 10 counts the pulses CP in the direction of the operator in consideration of the rotational direction of the motor 18, and can determine the two coordinates of the main body 1a of the tail stock 1 from the integrated value TP. On the other hand, the barrier setting memory 15 contains a fourth
Reference points PO, PL, P2. which serve as references when attaching the tail stock barrier T8B shown in the figure. P3. P4. P5's, Z
Coordinates in the direction of arrows C and D, which is the X-axis direction perpendicular to the axis (note that the X-coordinate of point PO is naturally 0), and the sleeve 2
A reference point PO set around.

A Z-axis indicating the positional relationship between Pi and P5 and between reference points p2, p3, and p4 provided around the main body 1a;
That is, the distance in the main axis direction is stored, and the control unit 1O refers to the memory 15 and first calculates points P2 and P3 around the main body 18 from the integrated value TP.

Calculate the Z coordinate of P4 (the Z coordinate of main body 1a is the integrated value T
It is calculated from P, and the points P2 and P3.

Since P4 is a fixed point with respect to the main body 1a, the two coordinates of each point can be easily calculated. ). Tail stock body 1a
When the sleeve 2 is positioned on the two axes, the cylinder portion 4 is driven to move the sleeve 2 by a predetermined amount in the direction of the arrow in relation to the main body 1a. When the sleeve 2 moves, the arm 2a also moves in the same way, and the scale type position detector 16 is operated.
The detector 16 outputs the amount of protrusion of the sleeve 2 from the main body 1m to the barrier control unit IO as a position signal SS. Control part 1
0 determines the Z coordinates of points PO, Pi, and P5 by referring to the memory 15 from the signal 88 and the aforementioned integrated value TP. The two coordinates of the sleeve 2 are calculated from the integrated value TP and the signal SS, and the Z coordinates of the points PQ , PI, and P5 are constant points with respect to the sleeve 2, so the Z coordinate of each point can be easily calculated. ), immediately set a tailstock barrier TSB around the tailstock l with reference to points PQ, Pl, . . . P5.

When the tail stock barrier TSB is set, the main control unit 6 drives the feed 9-axis control unit 7, and the control unit 7 rotates the feed shaft drive motor 12 to rotate the tool rest 22, 23 according to the arrow A in accordance with the nib program. , B, C, and D directions, but the coordinate positions of the tool rest 22 and 23 are the same as those of the motor 1.
The turret position detector 13 calculates the position information from the rotation angle device No. 2 and outputs it to the comparator circuit 9 as position information 8I. The comparison circuit 9 compares the position information 8I of the tool rest 22.23 with the setting range of the tail stock barrier TSB set by the barrier control unit IO, and places the tool rest 22.23 in the set area of the barrier TUB.
If it is recognized that the tool has entered, the alarm signal WS is immediately output to the main control unit 6, and the main control unit 6 stops driving the drive motor 12 via the feed shaft control unit 7, and the tool rest 22.2
3 and the tail stock l to prevent interference.

In the above embodiment, the scale type position detector 16 is used as the sleeve position detection means, and the pulse generator 17 is used as the tailstock body position detection means. Of course, any means such as a limit switch may be used as long as the position of the main body 1a can be detected. That is, sleeve 2
Normally, when the tail stock 1 does not engage with the workpiece 21, and therefore when the tail stock 1 is not used, it is kept fully moved in the entry direction or B direction with respect to the main body 1a, so the movement stroke of the sleeve 2 limit switches 26 and 27 are installed at the front and rear ends of the
Or, if the position of the sleeve 2 is detected by 27 and the barrier T8B is set according to the state of the sleeve 2, and the sleeve 2 and the workpiece 21 are abuttingly engaged and the tail stock l is used, By setting the machining origin ZP set on the end surface of the workpiece 21 as the reference point PO, the points P1゜P2
, P5 and set the barrier T8B. .

As explained above, according to the present invention, the pulse generator 17 and the scale type position detector 16, which are position detection means for the main body 1a of the tail stock 1 and the sleeve 2, are provided, and the tail stock barrier T8B is set. A barrier that stores the coordinates of the reference points PQ, P1,...P5 in the direction perpendicular to the main axis 3, and the positional relationship in the 3 main axis directions between the reference points provided around the sleeve and main body. A setting memory 5 is provided, and the position detection means detects the positions of the main body and sleeve in the main axis direction, determines the coordinates of the reference point in the main axis direction, and thereby sets the tail stock barrier TUB. T8B in a shape corresponding to the position of the main body la and the amount of protrusion of the sleeve 2,
Moreover, it can be set accurately in a way that it can move freely without being continuous with the machining origin zP, and there is no need for the conventional complicated work of inputting the length L every time the protrusion amount of the sleeve 2 changes. This can contribute to the realization of smooth machining operations in ordinary 2-axis numerically controlled lathes as well as 4-axis numerically controlled lathes in which the turret moves in a complicated manner.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional method of setting a tailstock barrier, Fig. 2 is a diagram showing the positional relationship between the workpiece and the tailstock barrier, and Fig. 13 is a control part of a numerically controlled lathe to which the present invention is applied. FIG. #14 is a schematic diagram showing an example of a tail stock portion of a numerically controlled lathe to which the present invention is applied. 1・・・・・・・・・Tail stock la...
・・・・・・Body 2・・・・・・・・・・・・Sleeve 3・・・・・・・・・Main shaft 5・・・・・・・・・・・・Numerical control lathe 15...
...Barrier setting memory 16...Position detection means (scale type position detector) 17...Position detection means (pulse generator)
PO, PI,...P5...Reference point T
UB...Tail stock barrier patent applicant Yamazaki Iron Works Co., Ltd. Agent Patent attorney Toni Aida (and 1 other person)

Claims (1)

[Claims] In a numerically controlled lathe having a main body movable in the main axis direction and a tailstock consisting of a sleeve provided on the core main body so as to freely protrude in the main axis direction, a means for detecting the positions of the main body and the sleeve is provided, and a tailstock barrier is set. A barrier setting memory is provided that stores the coordinates of the reference point in the direction perpendicular to the main axis, and the positional relationship in the main axis direction between the reference points provided around the sleeve and the main body, and the position detection means detects the main axis and the sleeve. A method for controlling the setting of a tailstock barrier in a numerically controlled lathe, comprising: detecting the position in the main axis direction of the barrier setting memory, determining the coordinates of the reference point in the main axis direction in the barrier setting memory, and setting the tailstock barrier accordingly.