JP3678494B2 - Rolling machine spindle drive - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle driving device for a rolling machine that rolls screws and the like, and in particular, drives a spindle of a through-rolling machine (walking rolling machine) that rolls screws and the like while moving a long workpiece in the axial direction. It relates to the device.
[0002]
[Prior art]
In general, a rolling machine for rolling screws and the like is shown in FIG. Reference numerals 101 and 101a denote a right spindle head and a left spindle head, respectively. A right spindle 102 and a left spindle 102a to which a pair of roll dies 103 and 103a are attached are rotatably supported. The left and right spindle heads 101 and 101a can turn with respect to the left and right spindle heads 104 and 104a around the turning pins 105 and 105a. On the left and right main shafts 102 and 102a, the rotation of the motor 110 is decelerated by the left and right gear boxes 109 and 109a via the drive shaft 111, and the pair of universal joints 106 and 107 (106a and 107a) and the intermediate shaft 100 connecting these are connected. It is transmitted through a two-stage universal joint consisting of 100a.
[0003]
Although the workpiece W is inserted between the roll dies 103 and 103a from the direction of the arrow A in the figure, the right spindle head 101, the right spindle 102 and the roll die 103 are moved together with the right spindle head 104, the right spindle 102 and the roll die 103 by the hydraulic mechanism or the like. Move to the left. As the roll die 103 is moved in this way, both the roll dies 103 and 103a are rotated and the thread of the roll dies 103 and 103a is pressed against the outer diameter of the work W to roll the screw while raising the thread on the work W. To do.
[0004]
Here, in order to roll a screw longer than the width of the roll dies 103, 103a, it is necessary to move the workpiece W in the direction of the arrow A during the rolling process, and the following method has been adopted conventionally.
1. When the leadless roll dies 103 and 103a are used, the work W is moved in the axial direction by one pitch every rotation by tilting the left and right roll dies 103 and 103a by the lead angle of the product screw to be rolled. .
2. When the roll dies 103 and 103a are used in which the lead angle of the roll dies 103 and 103a is different from the lead angle of the product screw, the work is performed by inclining the roll dies 103 and 103a by this angle difference. W is moved in the axial direction by an angular difference.
When the roll dies 103, 103a are tilted, the main shafts 102, 102a pivot about the pivot pins 105, 105a (see FIG. 7 showing the left side portion such as the left main shaft 102a). The distance 109a changes, but this is absorbed by the splines 108 and 108a. The spline 108 also absorbs axial displacement when the roll die 103 moves in the left-right direction.
[0005]
[Problems to be solved by the invention]
Thus, in the conventional mechanism in which the two-stage universal joints 106, 100, 107 (106a, 100a, 107a) are sandwiched in series between the main shafts 102, 102a and the gear boxes 109, 109a, as shown in FIG. Is increased, the difference between the input angle θα formed by the intermediate shaft 100a and the shaft of the gear box 109a and the output angle θβ formed by the main shaft 102a and the intermediate shaft 100a is increased, so that the constant velocity of the main shaft is deteriorated. . That is, the rotation irregularity of the main shaft occurs, and therefore the pitch accuracy of the thread to be rolled is poor, and a random walk occurs. In particular, when the rotation irregularities of the left and right main shafts are large and not synchronized with each other, these phenomena appear remarkably.
[0006]
SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a spindle driving device for a rolling machine in which the input angle and the output angle of a universal joint are made equal even if the inclination angle of the main shaft is changed so that rotation unevenness of the main shaft does not occur. Is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve this object, a main spindle drive device for a rolling machine according to the present invention includes a pair of motor side drive shafts to which rotation from a motor is transmitted, and a pair of reduction side drive units arranged in parallel to the motor side drive shafts. A pair of two-stage universal joints connecting the shaft, the pair of reduction side drive shafts and the pair of motor side drive shafts, and the pair of reduction side drive shafts perpendicularly intersecting the pair of main shafts It comprises a pair of reduction gears, and the input angle and the output angle of the pair of two-stage universal joints change equally according to the turning angle of the pair of main shafts.
[0008]
The input angle is an angle formed by intersecting the axis of the motor side drive shaft and the axis of the intermediate shaft of the two-stage universal joint, and the output angle is the axis of the deceleration side drive shaft and the intermediate shaft of the two-stage universal joint. This is the angle formed by intersecting the axes. The reduction gear has a worm wheel in which a worm and a reduction-side drive shaft are connected to a coaxial shaft. Furthermore, one of the motor side drive shafts can slide in its own axial direction.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to this invention, the rotation of the motor is equally transmitted to the pair of motor-side drive shafts, and the pair of motor-side drive shafts is transmitted to the deceleration-side drive shaft via the pair of two-stage universal joints. The rotation of the deceleration side drive shaft is decelerated by the worm and the worm wheel, and is transmitted to the left and right main shafts. Here, in order to perform thread rolling of a screw or the like, the left and right main shafts are tilted in opposite directions, and the roll dies are similarly tilted in opposite directions.
[0010]
By tilting the main shaft, the reduction-side drive shaft coupled to the main shaft via the reduction device also moves in either the vertical direction. Since the main shaft and the deceleration-side drive shaft intersect at a right angle, the deceleration-side drive shaft translates vertically without being inclined. The deceleration-side drive shaft and the motor-side drive shaft are connected by a two-stage universal joint, and the deceleration-side drive shaft and the motor-side drive shaft are kept in a parallel state. The input angle formed by the axis of the motor side drive shaft and the center axis of the intermediate shaft of the two-stage universal joint is equal to the output angle formed by the axis of the deceleration side drive shaft and the axis of the intermediate shaft of the two-stage universal joint. . Therefore, the constant speed of the left and right main shafts is maintained, and the rotation unevenness of the main shafts does not occur.
[0011]
Also, when rolling a workpiece, one of the main shafts contacts and separates, but the motor-side drive shaft corresponding to this can be slid in its own axial direction, so it can be absorbed. No problem at all.
[0012]
【Example】
A preferred embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a rolling machine incorporating the spindle driving device of the present invention, FIG. 2 is a rear view, and FIG. 4 is a diagram showing a structure in which the driving force of the motor is transmitted to the roll die, and FIG. 5 is a plan view.
[0013]
Reference numeral 1 denotes a base of a rolling machine body, on which a right spindle stock 2 and a left spindle stock 2a are placed. The left head stock 2a is fixed on the base 1, but the right head stock 2 is moved in the left-right direction of the arrow along the guide surface 26 by a hydraulic device 9 comprising a hydraulic cylinder or the like. The right spindle head 2 and the left spindle head 2a are attached to the right spindle head 3 and the left spindle head 3a so as to be rotatable in a vertical plane around pivot pins 7 and 7a aligned with each other (see FIG. 3). A right main shaft 5 and a left main shaft 5a are rotatably supported via bearings (only the front bearings 4 and 4a are shown in FIG. 1) from the right main shaft head 3 and the left main shaft head 3a. A pair of roll dies 6 and 6a are integrally attached to the right main shaft 5 and the left main shaft 5a. As shown in FIG. 3, the right spindle head 3 and the left spindle head 3a have a substantially rectangular parallelepiped shape, and worm boxes 8 and 8a are attached to the rear thereof. An operation panel 10 is provided with a centralized hydraulic gauge and various switches. Reference numeral 25 denotes a support base for supporting the workpiece W.
[0014]
A motor 11 is attached to the back surface of the base 1, and the rotation of the motor 11 is transmitted to the two motor-side drive shafts 13 and 14 via the pulleys 11a and 11b, the belt 11c, and the gear box 12 (see FIG. 4). Hereinafter, a structure in which the rotation of the drive shaft 13 is transmitted to the right main shaft 5 will be described.
[0015]
As shown in FIG. 4, a universal joint 16 is connected to one end of the motor side drive shaft 13, and a spline 13a is provided to the other end. The spline 13a is fitted with the female spline 15a inside the gear shaft 15, so that the motor side drive shaft 13 can move in the axial direction, and can follow this even if the right headstock 2 moves in the left-right direction. It is like that. The other universal joint 17 is coupled to the speed reducing drive shaft 19, and the universal joints 16 and 17 are coupled via a relatively short intermediate shaft 18 to form a two-stage universal joint 39. The intermediate shaft 18 uses a slide shaft provided with a spline 18a or the like, and can follow this even if the length connecting the motor side drive shaft 13 and the deceleration side drive shaft 19 changes.
[0016]
A worm 20 is provided at the tip of the deceleration-side drive shaft 19 and meshes with the worm wheel 21 to decelerate. The gear 23 of the worm wheel shaft 22 meshes with the gear 24 at the rear end of the right main shaft 5 so that the rotation of the speed reducing drive shaft 19 is transmitted to the main shaft 5 intersecting at right angles thereto. The worm 20, the worm wheel 21, the worm wheel shaft 22 and the gears 23 and 24 are accommodated in the worm box 8 to constitute a reduction gear 40. In this way, the rotation of the motor 11 is transmitted to the right main shaft 5 via the motor side drive shaft 13, the two-stage universal joint 39, the reduction side drive shaft 19, and the reduction device 40.
[0017]
The structure in which the rotation of the other motor-side drive shaft 14 is transmitted to the left main shaft 5a is exactly the same as that of the motor-side drive shaft 13, but the left main shaft base 2a does not move. There is no need to spline fit between the gear shaft and move in the axial direction. As can be seen from FIG. 4, the motor-side drive shaft 14 is a drive shaft with the gear shaft extending as it is, and the tip is coupled to the universal joint 30. Reference numeral 33 denotes a deceleration side drive shaft, and one end (left side in FIG. 4) is coupled to another universal joint 31. Since the space between the universal joints 30 and 31 is open, a relatively long intermediate shaft 32 is attached between the universal joints 30 and 31 to form a two-stage universal joint 41. Similarly to the intermediate shaft 18, the intermediate shaft 32 uses a sliding shaft provided with a spline 32 a and the like. A worm 34, a worm wheel 35 meshing with the worm wheel, a worm wheel shaft 36, a gear 37 rotating with the worm wheel 35, and a gear 38 meshing with the gear 37 and rotating the main shaft 5a are housed in the worm box 8a to constitute a reduction gear 42. Yes. In this way, the rotation of the motor 11 is transmitted to the left main shaft 5a via the motor side drive shaft 14, the two-stage universal joint 41, the reduction side drive shaft 33, and the reduction device 42.
[0018]
The motor side drive shafts 13 and 14 and the deceleration side drive shafts 19 and 33 are arranged in parallel.
[0019]
In the present invention, when the roll die is tilted, the angles formed by the two-stage universal joint and the motor side and deceleration side drive shafts are equal. That is, as can be seen from FIG. 2, since the motor side drive shafts 13 and 14 and the deceleration side drive shafts 19 and 33 are always kept in parallel, the axis of the motor side drive shafts 13 and 14 and the intermediate shafts 18 and 32 The input angles θ1 and θ2 formed by the shaft center are always equal to the output angles θ3 and θ4 formed by the shaft center of the deceleration side drive shafts 19 and 33 and the shaft center of the intermediate shafts 18 and 32, respectively. That is, θ1 = θ3 and θ2 = θ4. As a result, the motor-side drive shaft 13 (14) and the deceleration-side drive shaft 19 (33) rotate at the same speed, and therefore the left and right main shafts 5 and 5a maintain constant speed.
[0020]
Conventionally, since a two-stage universal joint is provided between the main shaft and the speed reducer, this two-stage universal joint requires the same large torque as the main shaft and requires a large transmission capacity. Since the universal joint is provided in front of the speed reducer, these two-stage universal joints may have a small torque and a small transmission capacity.
[0021]
The operation of the present invention configured as described above will be described below.
[0022]
As shown in FIG. 3, the left and right spindle heads 3, 3a are tilted around the pivot pins 7, 7a by loosening bolts and the like, and the left and right spindles 5, 5a and the roll dies 6, 6a are tilted with respect to each other. When the leadless roll dies 6 and 6a are used as known, the lead angles of the product screws to be rolled are inclined with respect to each other, and when the roll dies 6 and 6a having an angle difference from the lead angles of the product screws are used, The roll dies 6, 6a are tilted by this angle difference. When the right main shaft 5 is tilted counterclockwise and the left main shaft 5a is tilted clockwise, the worm box 8 coupled to the right main shaft 5 moves upward and the worm box 8a coupled to the left main shaft 5a is moved downward. Move to.
[0023]
Here, since the main shafts 5 and 5a and the deceleration-side drive shafts 19 and 33 intersect at right angles, the deceleration-side drive shafts 19 and 33 are not inclined and the deceleration-side drive shaft 19 is in parallel with the motor-side drive shaft 13. The deceleration side drive shaft 33 moves downward while maintaining a parallel state with the motor side drive shaft 14. Therefore, the intermediate shafts 18 and 32 are inclined as shown in FIGS. 2 and 4, and as described above, the input made by intersecting the axis of the motor side drive shaft 13 (14) and the axis of the intermediate shaft 18 (32). The angle θ1 (θ2) is equal to the output angle θ3 (θ4) formed by intersecting the axis of the deceleration side drive shaft 19 (33) and the axis of the intermediate shaft 18 (32).
[0024]
While the work W is placed on the support base 25 and the roll dies 6 and 6a are rotated, the roll die 6 is moved leftward in FIG. 1 and the work W is pressed by the roll dies 6 and 6a to roll the screw. Since the workpiece W is moved in the axial direction, a screw is rolled on the outer periphery, and the left and right main shafts 5 and 5a maintain constant speed, so that the screw accuracy of the rolled product is extremely good.
[0025]
So far, the rolling of the screw has been described, but when the burnishing rolling is performed in addition to the rolling of the screw, the workpiece W is moved in the axial direction by similarly tilting the pair of burnishing roll dies, and the burnishing rolling is performed. can do.
[0026]
【The invention's effect】
As described above, according to the rolling disk spindle driving device of the present invention, the following effects can be obtained.
1. Even if the inclination angle of the main shaft changes, the input angle and the output angle of the two-stage universal joint are always equal, so the main shaft is kept at a constant speed and rotation unevenness does not occur. be able to.
Since the 2.2-stage universal joint can be used with a small transmission capacity, it is inexpensive.
3. Only the speed reducer is connected to the rear of the main shaft, and the depth of the machine can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a front view of an embodiment of a rolling machine incorporating a spindle driving device of the present invention.
FIG. 2 is a rear view of the rolling machine of FIG.
FIG. 3 is a cross-sectional view taken along the line MM in FIG. 2;
FIG. 4 is a diagram showing a structure in which a driving force of a motor is transmitted to a roll die.
FIG. 5 is a plan view of FIG. 1;
FIG. 6 is a schematic plan view of a main part of a conventional rolling machine.
FIG. 7 is a view showing the inclination of the main shaft of a conventional rolling machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2, 2a Headstock 3, 3a Spindle head 5,5a Spindle 6,6a Roll dice 7, 7a Swiveling pin 8, 8a Worm box 11 Motor 12 Gear box 13, 14 Motor side drive shaft 16, 17 Universal joint 18 Intermediate Axis 19 Deceleration side drive shaft 20 Worm 21 Worm wheel 30, 31 Universal joint 32 Intermediate shaft 33 Deceleration side drive shaft 34 Worm 35 Worm wheel 39 Two-stage universal joint 40 Deceleration device 41 Two-stage universal joint 42 Deceleration device W Workpiece

Claims (4)

In a rolling machine having a pair of main shafts that can be swiveled in a vertical plane and one of which can contact and separate from the other, a pair of motor-side drive shafts that transmit rotation from the motor, and each motor side A pair of reduction-side drive shafts arranged in parallel with the drive shaft; a pair of reduction devices each having the reduction-side drive shaft and rotating a corresponding main shaft; the pair of reduction-side drive shafts and the pair of motors A pair of two-stage universal joints connecting the side drive shafts, the pair of deceleration side drive shafts intersecting the pair of main shafts at right angles, and the pair of main shafts according to the turning angle of the pair of main shafts A rolling disk spindle driving device characterized in that the input angle and output angle of a two-stage universal joint change equally. The input angle is an angle formed by intersecting the axis of the motor side drive shaft and the axis of the intermediate shaft of the two-stage universal joint, and the output angle is between the axis of the deceleration side drive shaft and the intermediate shaft. 2. The spindle driving device for a rolling machine according to claim 1, wherein the rotation angle is an angle formed by intersecting axes. 3. The spindle driving device for a rolling machine according to claim 1, wherein the speed reduction device has a worm wheel in which a worm and the speed reduction side drive shaft are connected to a coaxial shaft. 4. 4. The spindle driving device for a rolling machine according to claim 1, wherein one of the motor-side driving shafts is slidable in its axial direction. 5.

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