JPH0144210Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention involves sandwiching a workpiece between a pair of rolling dies that are held in a fixed headstock and a movable headstock and driven to rotate, and moving the movable headstock towards the fixed headstock in a predetermined position. This invention relates to a rolling machine that performs rolling by sending only the rolling stroke.

In this type of rolling machine, it is necessary to accurately adjust the distance between the centers of the rolling dies, that is, the distance between the centers of the spindles at the start of rolling. This distance between centers not only differs depending on the rolling die, but also varies depending on the diameter of the workpiece even when the same rolling die is used. Therefore, when changing the rolling die or machining a workpiece with a different diameter, It is necessary to adjust the center-to-center distance each time. Additionally, rolling machines are known in which multiple rolling dies are attached to each spindle in order to reduce the frequency of replacing the rolling dies.
Even with this rolling machine, it is necessary to adjust the distance between centers each time the rolling die used is changed. Conventionally, center-to-center distance adjustment was performed by the operator manually turning an adjustment screw that adjusts the front pole position (end position of the rolling stroke) of the moving headstock, which required tedious work. Not only that, but accurate center-to-center adjustment is difficult and confirmation must be made by trial rolling, which is time-consuming.

This invention aims to eliminate such drawbacks,
It is an object of the present invention to provide a rolling machine with an automatic position switching device that can easily switch and adjust the center-to-center distance to a desired value in a very short time.

Embodiments of the present invention will be described below with reference to the drawings.
In Fig. 1, a fixed headstock 2, a rolling machine main body 1,
A movable headstock 3 is provided, and a pair of rolling dies 6A, 7A and 6B, 7B are attached to each headstock 2, 3 by spindles 4, 5, respectively. A motor 8 is installed at the rear of the main body 1, and its rotation is transmitted to the main shafts 4 and 5 via a belt 9, a gear 10, etc., and the rolling die is rotationally driven.

A center stand 11 is arranged between the headstocks 2 and 3, and holds a workpiece 12. The center stand 11 is movable in the axial direction of the workpiece 12, and a cylinder device 13 is provided to move the center stand 11. The workpiece 12 to be processed in this embodiment includes rolling dies 6A and 7 as shown in FIG. 5A.
A workpiece 12A processed by A and B processed by rolling dies 6B and 7B as shown in Fig. 5B.
There is a workpiece 12B, the cylinder device 13 is connected to the center stand 11, and the A workpiece 12A is connected to the rolling die 6.
Position processed at A, 7A (hereinafter referred to as A position)
It can be moved to a position where the B workpiece 12B is processed by the rolling dies 6B and 7B (hereinafter referred to as the B position) and a retreat position where loading and unloading of the workpiece is performed. In addition, the cylinder device 1
3 to stop the center stand 11 at the A position and the B position, limit switches LSA and LSB are provided.

The movable headstock 3 can move forward toward the fixed headstock 2 and vice versa, and cylinder mechanisms 14, 14 for advancing the movable headstock 3 are provided behind the movable headstock 3. ing. A spline mechanism 15 is provided on the transmission shaft so as not to interfere with the drive mechanism of the main spindle 5 during movement of the headstock 3 and the main spindle 5 held therein.

An automatic position switching device 20 is provided behind the headstock 3 for setting the rolling stroke and switching the distance between centers. As can be clearly seen from FIG. 2, the automatic position switching device 20 includes an adjusting screw rod 21 that is threadedly engaged with the movable headstock 3 in the moving direction thereof, and is arranged concentrically with the adjusting screw rod 21, and is attached to the main body 1. It has a rotating sleeve 22 which is rotatable but held so as not to move in the axial direction. The adjusting threaded rod 21 is axially movable relative to the rotary sleeve 22 but cannot rotate due to the key 23, so that the adjusting screw rod 21 rotates together with the rotary sleeve 22. The adjusting screw rod 21 has a threaded portion 24 that threadably engages with the headstock 3, a threaded portion 25 at the rear end, and a stepped portion 2 in the middle.
6, and the threaded portion 25 has a stroke adjustment shaft 27.
are screwed together. The stepped portion 26 is the adjustment threaded rod 2
1 moves forward in the direction of arrow a together with the movable headstock 3, it collides with the stepped portion 22A of the rotary sleeve 22, which acts as a stopper to prevent further movement. On the other hand, the stroke adjustment shaft 27 has a flange portion 27A that collides with a metal fitting 22B attached to the rear end of the rotating sleeve 22 when the adjustment screw rod 21 retreats; Acts as a stopper to prevent Thus, the adjusting threaded rod 21 and the movable headstock 3 connected thereto are movable in the axial direction by a predetermined distance S relative to the rotary sleeve 22, and this distance S becomes the rolling stroke. In other words, the stepped portion 22A of the rotating sleeve 22, the metal fitting 22B, the stepped portion 26 of the adjusting screw rod 21, and the stroke adjusting shaft 27,
A stopper device is configured to limit the axial movement of the adjusting threaded rod 21 to a predetermined rolling stroke S.
The rolling stroke S can be adjusted by rotating the stroke adjusting shaft 27 with respect to the threaded portion 25 of the adjusting screw rod 21 to move the adjusting screw rod 21 and changing the position of the flange portion 26 with respect to the rotating sleeve 22.

Inside the rotating sleeve 22, spring receivers 28, 29 and a compression coil spring 30 are provided. Spring 3
0 pushes the stroke adjustment shaft 27 attached to the adjustment screw rod 21 backward, and the cylinder mechanisms 14, 14
is inoperable, the flange portion 27A is attached to the metal fitting 2.
I'm pushing it to 2B. The spring 30 therefore constitutes means for holding the adjusting screw rod 21 in the retracted position of the rolling stroke. Note that this means is not limited to the spring 30, but any means that can apply a force in the backward direction to the adjusting screw rod 21, such as a hydraulic cylinder or a pneumatic cylinder, may be used, and the mounting location is also the rotating sleeve. It is not limited to 22.

The rotating sleeve 22 has a gear 31 on its outer surface, and a small gear 33 of an operating shaft 32 meshes with the gear 31.
The operating shaft 32 further includes a large gear 34 .
is connected to a servo motor 38 via gears 35, 36, and 37, as shown in FIG. Thus, the servo motor 38 rotates the rotating sleeve 22 through each gear, and finally the adjusting screw rod 2
Rotate 1. A numerical control device 39 (see FIG. 1) is connected to the servo motor 38.

A tightening piece 40 and a tightening screw 41 for pressing and fixing the gear 31 against the main body 1 are provided near the rotating sleeve 22, and a cylinder device 42 is connected to the tightening screw 41 as shown in FIG. . The cylinder device 42 has a tightening screw 41,
Prior to activation of the servo motor 38, it is moved to the loosening position, and after the servo motor 38 is activated, it is moved to the tightening position. In addition, 43 in FIG. 4 is a limit switch that detects the loosened position and tightened position of the tightening screw 41.

Next, the rolling operation in the rolling machine will be briefly explained.

In FIG. 1, before rolling starts, the adjusting screw rod 21 is held in the retracted position by the spring 30, and the movable headstock 3 is in the retracted position. At this time, it is assumed that the center-to-center distance D is adjusted to a predetermined value suitable for the rolling die and the workpiece. Next, the workpiece 12 is mounted on the center base 11 at the retreat position, and after the center base 11 has moved to a predetermined machining position, the cylinder devices 14, 14 are activated to push the movable headstock 3 in the direction a, and The workpiece 12 is advanced by a predetermined rolling stroke S, and the rolling dies 6A and 7A rotated by the motor 8 perform rolling on the workpiece 12 in a predetermined manner. The center-to-center distance at the end of rolling is _DX .
After the rolling is completed, when the cylinder mechanisms 14, 14 are rendered inactive, the movable headstock 3 is returned to its original position (retracted position) by the spring 30 in preparation for the next machining.

Next, the adjustment of the front pole position of the movable headstock 3, that is, the switching adjustment operation of the center-to-center distance D will be explained. Normally, the adjusting screw rod 21 is held in the retracted position by a spring 30. In this state, when the tightening piece 40 is loosened and the servo motor 38 is rotated, this rotation is decelerated by a large number of gears, and the adjusting screw rod 21 is slowly rotated at a fixed position. Due to this rotation, the movable headstock 3 threadedly engaged with the adjusting threaded rod 21 moves, and the center-to-center distance D is adjusted. Here, since the amount of movement of the movable headstock 3 per rotation of the servo motor 38 is constant, by controlling the servo motor 38 with the numerical control device 39, the center-to-center distance D can be adjusted accurately. As the numerical control device 39, it is sufficient to appropriately design one that achieves the following functions, so a detailed explanation will be omitted and the control procedure will be explained.

(1) Set the origin of the movable headstock 3 (double-dashed line O in Figure 1) near the maximum center-to-center distance. In order to detect the origin, the movable headstock 3 is provided with, for example, a magnet switch 44 as an origin detection switch.

( ₂ ) If you want the rolling center distance ( _distance between centers at the end of rolling) to be D _X , set value _S
, and set this value on the operation panel.

(3) The control unit applies a rotation corresponding to the set value S _X to the motor 38 to move the movable headstock 3 forward from the origin by S _X to a desired center-to-center distance position.
In this way, the center-to-center adjustment is performed, and the above-mentioned rolling operation begins.

(4) Next, to change the rolling center spacing, set a new rolling center spacing, for example, a setting value S _XA corresponding to D _XA , on the operation panel. The control unit calculates the difference between the new _{set value S XA} and _the original set value _S
is applied to advance the movable headstock 3 to a new desired center-to-center distance position. If _{S XA −S} give to
The movable headstock 3 is advanced to a desired center-to-center distance position. The movable headstock 3 is positioned in the forward direction at a desired center-to-center distance position in order to maintain the same backlash conditions and improve the accuracy of center-to-center distance adjustment.

(5) Instead of setting the set value on the operation panel each time the center-to-center distance is changed, the set values for various workpieces can be stored in the storage device of the control unit, and these set values can be changed by operating a switch on the operation panel. may be called to adjust the center-to-center distance.

(6) In Fig. 1, the control device 39 for the servo motor 38
Although only the rolling machine of this embodiment is shown, it has an overall control device (not shown), and automates the rolling operation including the center-to-center switching operation. 6th A
6B and 6C are its operation diagrams. This operation diagram shows the fifth workpiece as the workpiece 12.
This is when rolling is performed on either the A work 12A as shown in Figure A or the B work 12B as shown in Figure 5B.
The set value S _XA for the B work 12B and the set value S _XB for the B work 12B are programmed in advance. Here, S _XA > S _XB .

As can be seen from this operation diagram, when a workpiece is selected with the changeover switch, subsequent switching between spindle centers, center table movement, work loading, rolling operations, etc. are automatically performed. Further, the workpiece selection operation can also be automated by inputting an external signal related to the type of workpiece instead of inputting the changeover switch.

(7) The rolling machine shown in Figure 1 can be used not only when rolling one workpiece at one location, but also when rolling one workpiece at two locations. That is,
Rolling dies 6A, 7A at one location on one workpiece
When rolling is performed using the rolling dies 6B and 7B, it is also possible to shift the workpiece in the axial direction and roll the workpiece at another location using the rolling dies 6B and 7B. Also in this case, by programming the set values S _XA and S _XB for each rolling operation in advance, the center-to-center distance can be automatically switched prior to each rolling operation.

As described above, in the present invention, the adjusting screw rod 21 is threadedly engaged with the movable headstock 3, and the moving distance of the adjusting screw rod 21 is regulated by the stopper device, so that the movable headstock 3 can achieve a predetermined rolling. The adjustment screw rod 21 is configured to be able to move by the stroke, and also rotated by a servo motor 38 controlled by a numerical control device. Therefore, it is possible to adjust the position of the movable headstock 3 and switch the distance between the spindle centers to a desired value very easily and accurately, and it is possible to significantly shorten the setup time for different types of workpieces. Further, it is possible to roll different workpieces with a constant rolling stroke. Furthermore, since a means is provided to move the center stand that holds the workpiece in the axial direction of the workpiece, after rolling is performed at one location on the workpiece, the workpiece is moved in the axial direction and the servo motor is used to move the workpiece in the axial direction. By changing the center-to-center position of the spindle, rolling of different diameters can be performed at different positions on the workpiece. In this way, the rolling machine of the present invention can extremely quickly roll different types of workpieces and roll different positions within one workpiece, and has the effect of improving processing efficiency. have.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of one embodiment of the present invention;
3 is a front view showing the gear train from the operating shaft 32 to the servo motor 38, FIG. 4 is a front view showing the operating mechanism of the tightening screw 41 of the tightening piece 40, and FIG. 5A and 5B are plan views showing the machining states of the A arc 12A and the B workpiece 12B, respectively, and FIGS. 6A, 6B, and 6C are operational diagrams of the rolling machine shown in FIG. 1. 1...Rolling machine body, 2...Fixed headstock, 3...
Movable headstock, 4, 5...Main spindle, 6A, 6B, 7
A, 7B...Rolling die, 11...Center stand, 1
2, 12A, 12B...Work, 20...Automatic position switching device, 21...Adjustment screw rod, 22...Rotary sleeve, 27...Stroke adjustment shaft, 30...
Spring, 38... Servo motor, 39... Numerical control device.

Claims (1)

[Scope of Claim for Utility Model Registration] A workpiece held on a center stand is sandwiched between a pair of rolling dies held by a fixed headstock and a movable headstock and driven to rotate, and the movable headstock is replaced by a fixed headstock. In a rolling machine that performs rolling by advancing toward the moving headstock, an adjusting threaded rod is threadedly engaged in the moving direction of the movable headstock, and the axial movement of the adjusting threaded rod is limited to a predetermined rolling stroke. a stopper device, a means for holding the adjusting threaded rod at a backward position of the rolling stroke, a servo motor for rotationally driving the adjusting threaded rod, and a means for driving the servo motor so that the main shaft moving table moves to a desired position. An automatic positioning device comprising: an automatic position switching device having a numerical control device that controls rotation by a required number of rotations; and means for moving a center table that holds a workpiece in the axial direction of the held workpiece. Rolling machine with switching device.