JP3079576B2 - Chuck device for thread groove phase alignment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread groove phase matching chuck device for accurately performing the phase matching of a thread groove in advance, for example, when grinding a thread groove formed by cutting with a grinder.

[0002]

2. Description of the Related Art In order to grind a thread groove of a screw shaft in which a thread groove has been cut in advance on the outer surface with high precision, it is necessary to accurately apply a grinding wheel of a grinding machine to the thread groove. Therefore, conventionally, for example, the phase of the thread groove N with respect to the vignetting drive pin of the grinding machine has been previously adjusted using a thread groove phase matching device 1 as shown in FIG. In the figure, W is a screw shaft as a work, and a thread groove N is formed in advance by cutting. One end of the work W is supported by one center 2, and the other end is supported by the center 4 of the tailstock 3. A screwdriver 5 is inserted into the outer circumference of the end of the work W on the center 2 side, but the fixing bolt 5a is loosened. Then, the outer periphery of the end of the work W on the center 2 side is gripped by rubber rollers 11a and 11b, which are gripping members of the thread groove phase matching chuck device 10 shown in FIG. The rotation is stopped at the position where the ball 7a is fitted in the thread groove N, and the button 5 is fixed to the work W by tightening the button fixing bolt 5a. Then, the work W is moved to both centers 2 and 4.
From the center of the screw grinder, and automatic grinding is performed with the correct phase based on the dent 5 fixed as described above. During the grinding, the next work W is set in the thread groove phase matching device 1, and is gripped and rotated by the screw groove phase matching chuck device 7 in the same manner as described above to perform the phase matching. In this way, by setting the knurls 5 in the correct phase for each workpiece to be ground, highly accurate grinding can be performed. If the phase is not correct, the grinding wheel will not hit the surface of the thread groove N averagely, and the groove machining accuracy will soon collapse.

The conventional chuck device 10 for thread groove phase alignment is such that a pair of rubber rollers 11a and 11b as gripping members that rotate while gripping the outer peripheral surface of the end of the work W can be opened and closed about a fulcrum 12. Arm 13a, 13b. The side surface of one arm 13a is locked by a rod 14a of the air cylinder 14, and the rod 14a
The rubber roller 11a, 11b grips the workpiece W by the extension of. The rubber rollers 11a and 11b are respectively driven to rotate by a motor 15 as a rotating device via a toothed belt 16. In addition, 17 is a pulley.

[0004]

However, in the above-mentioned conventional chuck device 10 for thread groove phase alignment,
Since the gripping members of the work W are the rubber rollers 11a and 11b, when the work W is gripped, the work W is compressed by the elasticity of the rubber and the outer diameter of the roller changes. Therefore, there is a problem that even if an attempt is made to adjust the phase of the thread groove N while controlling the rotation by the number of pulses using the stepping motor 15 as the rotating device, the rotation angle of the workpiece W is different and the control becomes difficult.

Also, a fixing bolt 5 for fixing the
When a is tightened, the center of the bolt tip does not necessarily contact the outer peripheral surface of the work W perpendicularly, and the bolt is one-sided. When the tip of the fixing bolt 5a hits one side, the work W
A rotational force acts on. However, the gripping members of the conventional thread groove phase matching chuck device 10 are rubber rollers 11a and 11b having elasticity, and the work W is rotated because it cannot withstand the rotational force due to the tightening of the fixing bolt 5a. As a result, the kerf 5 and the thread groove N
Has a problem that the phase is shifted.

As chucks for machine tools, there are generally used three-jaw and four-jaw jaw chucks, collet chucks, and the like. In the jaw chuck, the jaws move in the radial direction of the chuck body. And there is play between the claw and the chuck body. Therefore, when a rotational force acts on the work W, the pawls are displaced in the circumferential direction by the amount of the play, which is not suitable as a chuck for adjusting the phase of the thread groove. In addition, since the collet chuck has a fixed gripping diameter, any workpiece having a fixed outer diameter may be used.
It is not possible to cope with a change in the work outer diameter.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to cope with works of various dimensions, so that the work is not deformed even if the work is gripped. Another object of the present invention is to provide a thread groove phase matching chuck device capable of fixing a dent in a correct position without causing a phase shift even if a rotational force acts on a work by tightening a fixing bolt.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a thread groove of a work, which has a thread groove on an outer surface thereof, the outer peripheral surface of the work supported between both centers is gripped by a gripping member, and is rotated by a rotating device. In the thread groove phase matching chuck device configured to perform phase matching, a ring-shaped chuck body formed so as to insert the work supported by the center at the center of rotation is provided, and the gripping member is a chuck body of the chuck body. A plate whose one end is fixed to the inner surface and the other end is a free end that can be displaced only in the radial direction of the chuck body so as to contact the outer peripheral surface of the work.
And a pressing member for pressing the free end of the gripping member from the back surface is provided inside the chuck main body so as to be movable in a radial direction of the chuck main body.

[0009]

When the workpiece is chucked by the chuck device for screw groove phase alignment, the end face of the work is rotatably supported at the center between both centers of the screw groove phase alignment device, and then the screw groove phase alignment is performed on one end side of the work. The chucking device is fed and set, and the free end of the gripping member is brought into contact with the outer peripheral surface of the end of the work from the tangential direction. Since the gripping member is formed of a plate-like elastic member capable of being displaced in the radial direction of the chuck body, it can easily cope with works of various dimensions having different outer diameters. Next, the pressing member is advanced in the radial direction of the chuck main body from the retracted position, is applied to the back surface of the holding member, and presses the holding member against the outer peripheral surface of the work. At this time, the plurality of pressing members advance radially at the same time and press the outer surface of the cylindrical work with the same opposing force, so that the work is centered accurately. The work thus held is rotated to perform phase matching using a positioning jig, but the holding member has high rigidity and does not deform like a rubber roller. Therefore, the rotation angle of the work and the rotation angle of the chuck body exactly match, and the rotation control by the stepping motor is easy.

Further, a fixing bolt 5 for fixing
When tightening a, even if a rotational force acts on the work, the gripping member has one end fixed to the inner surface of the chuck body, and the circumferential displacement of the chuck body is completely regulated, Rotational force generated by tightening the fixing bolt 5a can be counteracted to prevent rotation of the work. Therefore, unlike the related art, the work does not rotate relative to the gripping member, and the phases of the burrs and the screw grooves do not shift, and accurate positioning can be performed.

The pressing member moves in the radial direction of the chuck main body. However, even if there is play between the pressing member and the chuck main body, the pressing member presses the work via the gripping member. There is no deviation in the circumferential direction by the amount of play due to the rotational force acting on the work.

[0012]

1 to 3 show an embodiment of a chuck device for thread groove phase alignment according to the present invention. The thread groove phase matching chuck device 20 is mounted on the tailstock 3 of the thread groove phase matching device. That is, in this embodiment, the slide unit 21 which can move back and forth in the axial direction is attached to the tailstock 3 with the screw B1 via the bracket 21a, and the bracket 22 is attached to the slide unit 21 with the bolt B2.
The flange 23 of the chuck device 20 for thread groove phase matching is supported on the bracket 22 by bolts B3. The center of the flange 23 is open,
The center 4 of the tailstock 3 protrudes from the opening. On the front side of the flange 23, a case 24 of the chuck device 20 for thread groove phase matching is mounted. This case 2
A stepping motor 25 constituting a rotating device is mounted on the rear surface of the upper portion of the motor 4 with bolts B4, and a motor pulley 26 is mounted on the main power shaft 25a. on the other hand,
A ring-shaped cylinder pulley 28 as a chuck body is rotatably disposed concentrically with the center 4 via a bearing 29 on the front side of the lower portion of the case 24. 30
Reference numerals a and 30b denote retaining rings for holding the bearing 29.
The motor pulley 26 and the cylinder pulley 28 are connected by a timing belt 31. The above-mentioned cylinder pulley 2
On the inner surface of the cylinder 8, four cylinder blocks 32 are provided.
It is mounted at intervals of 0 degrees around the circumference. And
As shown in FIG. 3, a piston 34 as a pressing member is slidably mounted via a packing 35 in the cylinder bore of the cylinder block 32. These pistons 34 have a spherical head 34a, and a parallel pin 36 penetrates the piston body vertically. Both ends of the parallel pin 36 are inserted into and supported by elongated through holes provided in the side wall of the cylinder block 32.
4 functions as a stopper for preventing the cylinder bore from coming off. Each head 34a is set so as to be directed to the rotation center axis of the cylinder pulley 28, guided by the parallel pin 34, and slid in the radial direction (that is, in the radial direction of the cylinder pulley 28 as the chuck body). Note that 33
Is a lid for sealing air in the cylinder portion.

On the side surface of each cylinder block 32, a work gripping member 37 has one end fixed with a screw B6 and extends cantilevered. In the case of this embodiment, the work gripping member 37 is formed of a leaf spring which is an elastic member, extends tangentially to the peripheral surface of the work W supported by the center 4, and has a chuck claw 38 at its free end. Is stuck. The back surface of the free end faces the head 34a of the piston 34. Thus, the chuck claw piece 38 is
8 so as to be displaceable only in the radial direction and to be able to contact and separate from the outer peripheral surface of the work W.

In order to operate the piston 34 with compressed air, an air port block 4 is provided at the center of the rear surface of the flange 23.
0 (see FIG. 3), an air circuit 42 is formed from the air port 41 to the space behind the piston 34 through the flange 23 and the cylinder pulley 28. Reference numeral 43 denotes an O-ring as a seal member for preventing the air circuit 42 from leaking. The O-ring 43 is attached to a connection point between the flange 23 and the air port block 40. Reference numeral 44 denotes a special O-ring as a seal member for preventing the air circuit 42 from leaking, and is attached to a connection portion between the flange 23 and the cylinder pulley 28.

Next, the operation will be described. The thread groove phase matching chuck device 20 is initially in a retracted position shown by a chain line in FIG. Further, the piston 34 is also retracted. When the work W is set in the screw groove phase matching device and chucked by the screw groove phase matching chuck device 20, first, the end face of the work W is first set to both centers (2, 2) of the screw groove phase matching device.
4) The center is supported rotatably by sandwiching between them. Thereafter, the slide unit 21 advances the chuck device 20 for thread groove phase alignment to the position shown by the solid line in FIG.

Next, the piston 34, which is a pressing member, is advanced from the retracted position, and the work gripping member 37 is pressed against the outer peripheral surface of the work. This operation is performed by the air port block 40.
This is performed by sending compressed air from a pressure source (not shown) previously connected to the air port 41 through the air circuit 42 to the rear side of the piston 34 in the cylinder bore of the cylinder block 32. The supply of this compressed air is 4
This is done simultaneously for the cylinder blocks 32. As a result, the four pistons 34 simultaneously advance toward the center of the cylinder pulley 28 and strongly press the outer surface of the cylindrical work W via the work holding member 37 with equal and opposite forces. Accordingly, the work W is centered accurately. The work gripping member 37 extends tangentially to the outer peripheral surface of the end of the work W, and its free end is
Chuck claw piece 3 which is elastically deformed and fixed
8 comes into contact with the outer peripheral surface of the work, clamps it and clamps it. As described above, the work holding member 37 can be displaced in the radial direction of the cylinder pulley 28, and can easily cope with the work W having different outer diameters.

Subsequently, the stepping motor 25 is started, and the cylinder pulley 28 is
Is driven to rotate. Then, a retaining ring 30 b for holding the inner ring of the bearing 29, four cylinder blocks 32, a lid 33 for sealing air in the cylinder part, a piston 34, a packing 35, a parallel pin 36, a work gripping member 37, a chuck claw piece 38. Rotates integrally with the cylinder pulley 28. Thus, the work W is rotated, and the phase is adjusted using the positioning jig 7. In that case, the work gripping member 37
Is a spring plate and has high rigidity, so that the conventional rubber roller 11a,
There is no deformation like 11b. Therefore, work W
And the rotation angle of the cylinder pulley 28 always exactly match, and the rotation control by the stepping motor 25 is easy.

When the positioning by the positioning jig 7 is completed, the fixing bolts 5a are tightened to fix the knurls 5.
At this time, even if the fixing bolt 5a hits against the outer surface of the work W and a rotational force acts on the work W, the work holding member 3
7 has a base end fixed to the cylinder block 32 on the inner surface of the cylinder pulley 28, and the displacement of the cylinder pulley 28 in the circumferential direction is completely regulated. As a result, the rotation of the work W can be completely prevented. Therefore, unlike the related art, the work does not rotate relative to the gripping member, and the phases of the burrs and the screw grooves do not shift, and accurate positioning can be performed. Even if there is play between the piston 34 that moves in the radial direction of the cylinder pulley 28 and the cylinder bore of the cylinder block 32, the work gripping member 37
Therefore, even if the fixing bolt 5a of the button is tightened on one side, the phase between the thread groove N and the button 5 does not shift as in the related art.
When releasing the clamp of the work W, the supply of the compressed air to the air port 41 is stopped, and a switching (not shown) is operated to release the pressure at the rear of the piston 34. Then, the piston 34 retreats due to the elastic restoring force of the work holding member 37, and the clamping of the work by the chuck claws 38 is released.

In the above embodiment, the case where compressed air is used to drive the piston 34 has been described. However, the present invention is not limited to this, and other pressure gas or hydraulic pressure may be used. In the above description, the piston 34 is used as the pressing means of the workpiece gripping member 37. However, other electrical means such as a solenoid, or mechanical means such as a lever or a screw may be used.

[0020]

As described above, the chuck device for thread groove phase alignment according to the present invention is provided with a ring-shaped chuck body formed so that a work supported at the center is inserted around the center of rotation. Is a plate shaped with one end fixed to the inner surface of the chuck body and the other end as a free end that can be displaced only in the radial direction of the chuck body so as to contact the outer peripheral surface of the work
And a plurality of pressing members for pressing the free end of the gripping member from the back surface are provided inside the chuck main body so as to be movable in the radial direction of the chuck main body. Can be easily displaced, and does not deform even if the work is gripped. It has the effect that it can be fixed.

[Brief description of the drawings]

FIG. 1 is a front view showing a part of an embodiment of the present invention with a part cut away.

FIG. 2 is a left side view of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a front view of a thread groove phase matching device having a conventional thread groove phase matching chuck device.

FIG. 5 is a side view of a conventional thread groove phase matching chuck device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thread groove phase matching device 2, 4 center 10, 20 Thread groove phase matching chuck device 28 Chuck body (cylinder pulley) 34 Pressing member (piston) 37 Work holding member N Thread groove W Work

Claims (1)

(57) [Claims] 1. A work having a screw groove on its outer surface and holding an outer peripheral surface of a work supported between both centers by a holding member, and applying rotation by a rotating device to perform phase adjustment of the work screw groove. In the chuck device for thread groove phase alignment, a ring-shaped chuck main body formed so as to insert the work supported by the center at the center of rotation is provided, and the gripping member is fixed at one end to an inner surface of the chuck main body, and the like. A pressing member that presses the free end of the gripping member from the back surface is formed by a plate-shaped elastic member that is configured to contact the outer peripheral surface of the work as a free end that is displaced only in the radial direction of the chuck main body. A chuck device for thread groove phase alignment, wherein the chuck device is provided inside a chuck main body so as to be movable in a radial direction of the main body.