JPH0732202A - Chuck device and turning device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable both ends of a workpiece to be machined simultaneously in a general turning manner. A hollow chuck member 38 having collet parts 37 at both ends and two leaf collets 39 that expand and contract the diameter of the collet part 37 by relative movement are arranged in a main body 35. Compression spring 41
Is always urged in the chucking direction by means of a link mechanism 42 composed of two links 43, 44 and is relatively movable, and the pusher rod 28 is inserted into the main body 35 through a bush 52 fixed to the main body 35. Expand the two links 43 and 44 to expand the two leaf collets 3
The chuck device 1 configured to move 9 in the unchucking direction is rotated, and the workpiece W is moved by the cutting tool 13.
Both ends are processed simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck device suitable for simultaneous machining of both ends of a rod-shaped workpiece and a turning device using this chuck device.

[0002]

2. Description of the Related Art Conventionally, as a turning device for simultaneously processing both ends of a rod-shaped work, a clamping means for clamping the work is arranged in the center, and so-called centering machines are arranged on both left and right sides of the clamping means. There has been a centering machine having a main spindle (spindle) provided with one or a plurality of cutting tools so that an end of a work is turned by rotation and linear movement of the main spindle.

[Problems to be Solved by the Invention]

However, according to the conventional turning device described above, turning is performed by rotating and linearly moving the cutting tool, that is, so-called face cutting, so that it is not possible to machine a small diameter portion or a groove in a portion entering from the end of the work to the inside. It was not possible, and its application range was limited. In addition, since the cutting tool is fixed in position with respect to the center of rotation of the main shaft, it is not possible to perform external correction for cutting tool wear, and the machining shape is constant, and the cutting tool is frequently changed depending on the cutting tool wear or shape change. There was also the problem that productivity could not be increased as expected.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to enable both ends of a work to be simultaneously processed in a general turning manner, thereby expanding the range of application. Another object of the present invention is to provide a chuck device that greatly contributes to improvement in productivity and a turning device using the chuck device.

[0005]

In order to achieve the above object, a chuck device according to the present invention comprises a cylindrical body,
A hollow chuck member having outer diameter gripping collet parts at both ends and two leaf collets for expanding and contracting each of the collet parts by relative movement are provided, and the two leaf collets are axially arranged on the main body. The two leaf collets are slidably inserted, and the two leaf collets are always biased by a biasing means in a chucking direction for reducing the diameter of the collet portion, and the two leaf collets are connected by a link mechanism so as to be relatively movable. In addition, the main body is provided with an operation hole for operating the link mechanism.

Further, a turning device according to the present invention comprises a base for rotatably supporting the chuck device according to claim 1.
The driving means for rotating the chuck device and the link mechanism are operated through an operation hole of the chuck device.
An operation means for relatively moving two leaf collets in the unchucking direction; and two tool rests for supporting a cutting tool for processing a work and for moving the cutting tool to a processing position on both left and right sides of the chuck device, It is characterized by having done.

[0007]

In this chuck device, when the two leaf collets are moved in the unchucking direction by operating the link mechanism, the two collet parts of the chuck member are expanded in diameter and the work can be inserted into the chuck member. On the other hand, if the operation of the link mechanism is released from the above state, the two leaf collets are moved in the chucking direction by the urging force of the urging means, the two collet portions are reduced in diameter, and the rod-shaped work is It is surely chucked in two places.

Further, in the present turning device, since the chuck device constructed as described above is used as the main shaft to be rotated by the driving means, the tool rests provided on both sides of the chuck device are operated to operate in a general turning manner. Both ends of the work can be processed simultaneously with high efficiency.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a turning device according to the present invention. In these drawings, reference numeral 1 denotes a chuck device, which will be described in detail later, and is rotatably supported by a pair of left and right brackets 3 extending from a base 2 via bearings 4 (FIG. 4) described later. The base 2 is composed of a base 5 and a standing wall 6 standing upright on the back side of the base 5, and is configured to have an L-shape as a whole. The standing wall 6
Has a thick wall portion 6a on the left side of the center of the base 2 in the longitudinal direction (left and right direction in FIG. 1) and a thin wall portion 6b on the right side thereof. It is fixed to the front surface of the thick wall portion 6a of the standing wall 6.

The chuck device 1 allows the rod-shaped work W to be inserted therein and chucked at two places, and a sprocket 7 is integrally provided on the outer periphery thereof. On the other hand, a box-shaped support base 8 is mounted on a portion of the base 5 corresponding to the thick wall portion 6a, and a servo motor 9 is mounted and fixed on one side of the support base 8. ing. A sprocket 10 is attached to the output shaft of the servo motor 9, and a chain 11 is wound around the sprocket 10 and the sprocket 7 of the chuck device 1. That is, the chuck device 1 is rotated by the operation of the servo motor 9.

In addition, on the upper front surface of the standing wall 6 of the base 2,
Two tool rests 12A and 12B are attached to the left and right sides of the chuck device 1, respectively. Each turret 12A, 12B
Is a swivel base 14 that supports the cutting tool 13, a slide mechanism (not shown) that movably supports the swivel base 14 in the left-right direction (horizontal direction) and the vertical direction (vertical direction), and the swivel base 14 is swung. A servo motor (not shown), and a horizontal feed and vertical feed servo motor 15 for driving the slide mechanism,
16 and. The servo motors are operated and controlled by a numerical control device (NC).
The cutting tool 13 moves to a predetermined processing position in response to a command from
Both ends of the work W chucked by the chuck device 1 are simultaneously processed.

Reference numerals 17A and 17B denote tailing devices arranged on both left and right sides of the chuck device 1. Each tailstock device 17A,
The center 17B includes a center 18 and a tailing cylinder 19 that supports the center 18 and moves on the axis of the work W chucked by the chuck device 1. Of the cylinders, the cylinder 19 of the left tailing device 17A is directly connected to the thick wall portion 6a of the standing wall 6 via the bracket 20 (FIG. 2), while the cylinder 19 of the right tailing device 17B is connected.
Is fixed to the output shaft end of the advancing / retreating cylinder 21 fixed horizontally to the thin wall portion 6b of the vertical wall 6 (FIG. 3). That is,
The tailstock 17A on the left side is fixedly provided, while the tailstock 17B on the right side is movably provided in a direction intersecting the axis of the work W. As a result, when the advancing / retreating cylinder 21 is operated toward the contraction side, the tailstock 17B on the right side is retracted from the axis of the work W, so that the work W can be freely taken in and out of the chuck device 1 from the right side. .

Reference numeral 22 is a stopper device provided on the support base 8 on the base 2. The stopper device 22 is for positioning the work W with respect to the chuck device 1, and includes a lifting cylinder 23 fixed to the upper plate 8a of the support base 8 inside the support base 8 and an upper portion of the support base. In the cylinder 23, it comprises an elevating plate 24 fixed to the output shaft end, and a slider 26 having a stopper plate 25 at the upper end and slidably mounted on the elevating plate 24 in the left-right direction. Lifting cylinder
When the lift plate 24 is raised by the operation of 23, the stopper plate 25
Moves up to a position where it crosses the axis of the work W chucked by the chuck device 1. Therefore, when the position of the slider 26 is appropriately adjusted to raise the stopper plate 25, the work W comes into contact with the stopper plate 25 and is positioned with respect to the chuck device 1.

Numeral 27 is an operation unit (operation means) for uncucking a chuck mechanism in the chuck device 1 which will be described later, and includes a cylinder 29 having a push rod 28 at the output shaft end and a base 5. The bracket 30 extends from the upper end of the standing wall 6 and supports the cylinder 29 so that the push rod 28 is directed downward on a vertical line orthogonal to the axis of the chuck device 1. Also, 31 is
It is a sensor that detects the rotational position of the chuck device 1 by engaging with a dog 32 provided on the outer periphery of the chuck device 1.

Here, the chuck device 1 is shown in FIGS.
It has a structure as shown in. In these figures,
Reference numeral 35 denotes a cylindrical main body, and both end openings of the main body 35 are closed by end plates 36 having a through hole 36a for the work W at the center. Inside the main body 35, a hollow chuck member 38 having collet parts 37, 37 at both ends and two leaf collets 39, 39 for expanding and contracting the collet parts 37, respectively, are arranged. Each leaf collet 39 has an inner diameter tapered surface at its tip.
39a are arranged in mutually opposite directions so as to slidably contact the outer diameter taper surface 37a of the collet portion 37, and are slidably inserted in the main body 35 via a bearing 40 in the axial direction. Further, a compression spring 41 is interposed between the end plate 36 of the main body 35 and each leaf collet 39. Due to the presence of the compression spring 41, the leaf collets 39 are urged toward each other, and normally act to reduce the diameter of the collet portion 37 of the chuck member 38. The chuck member 38 is held by the leaf collet 39 so that its hollow hole 38a is aligned with the insertion hole 36a of the end plate 36.

The two leaf collets 39,
39 is connected by a pair of link mechanisms 42, 42 arranged between the two so as to be relatively movable. A pair of link mechanisms 42
Are arranged in symmetrical positions with the positions of 180 degrees displaced in the circumferential direction of the leaf collet 39.
It consists of two links 43 and 44 combined in a mountain shape outward in the radial direction. More specifically, as shown in FIG. 6, each of the links 43, 44 is composed of a pair of plate-like bodies 43a, 44a, and the tip ends of the respective links are rotatably connected using a common shaft 45. . An annular receiving member 46 is non-rotatably fitted to the central portion of the shaft 45, and the pair of plate-like members 43a and 44a are arranged with the receiving member 46 interposed therebetween at different intervals. ing. On the other hand, the pair of plate-like bodies 43a,
The base end portion of 44a is extended to both sides of a boss portion 47 projecting from the rear end of each leaf collet 39, and is rotatable about each leaf collet 39 using a shaft 48 in which the boss portion 47 is inserted. It is connected.

As well shown in FIGS. 5 and 6, the main body 35 has a connection point on the inner peripheral surface of the two links 43, 44 constituting each of the link mechanisms 42, that is, a link mechanism.
Recesses 49, 49 for receiving the peaks of the mountain shape of 42 are formed, and through holes 50, 50 (operation holes) penetrating from the recess 49 to the outer peripheral surface are formed on the peripheral wall thereof. Further, on the outer periphery of the main body 35, an annular ring 51 having a stepped hole 51a communicating with the through hole 50 is fitted.
A bush 52 for slidingly guiding the push rod 28 of the operation unit 27 is fitted therein. On the other hand, a receiving member fitted to a shaft 45 that connects the two links 43 and 44.
A conical recess 46a is formed on the outer periphery of 46, and the recess 46a faces the through hole 50 of the main body 35.

The tip of the push rod 28 is formed into a tapered taper portion 28a, and the chuck device 1 is fixed in the rotational direction so that the through hole 50 of the main body 35 is directed toward the push rod 28 of the operation unit 27. When the push rod 28 is lowered by the operation of the cylinder 29, the push rod 28 is inserted through the bush 52, and the tapered portion 28a at the tip end thereof engages with the recess 45a of the receiving member 46. Therefore, if the push rod 28 is further lowered after this,
The shaft 45 supporting the receiving member 46 descends, whereby the two links 43, 44 forming the link mechanism 42 are expanded as shown in FIG. 7, and the two leaf collets 39,
39 moves away from each other, that is, in the unchucking direction, and as a result, the collet portion 37 of the chuck member 38 expands in diameter. The bearing 4 for rotatably supporting the chuck device 1 on the bracket 3 of the base 2 is
The sprockets 7 that are fitted to both ends of the main body 35 and that rotate the chuck device 1 are fitted to the main body 35 adjacent to one of the bearings 4.

The operation of the turning device and chuck device 1 configured as described above will be described below.

In turning, the chuck unit 1 is rotationally fixed in advance so that the through hole 50 of the main body 35 is directed to the push rod 28 of the operation unit 27 by the signal of the sensor 31 (FIG. 1) in advance, and the operation unit is rotated. The push rod 28 is lowered by the operation of the cylinder 29 of 27. Then, the push rod 28 is inserted through the bush 52 and abuts on the receiving member 46,
The two links 43, 44 of the link mechanism 42 are expanded. As a result, the two leaf collets 39, 39 move in the unchucking direction, and the collet portion 37 of the chuck member 38 expands in diameter. Next, the cylinder 21 for advancing and retracting is actuated to the right (Fig. 1)
Of the tailing device 17B of the chuck 1 on the axis of the chuck device 1 (home position)
At the same time as it is evacuated, the elevating plate 23 of the stopper device 22 is raised by the operation of the elevating cylinder 23, and the stopper plate 25 is positioned on the axis of the chuck device 1. Then, under this preparatory state, the work W is inserted into the chuck member 38 in the chuck device 1 from the right side in FIG. 1, the chuck device 1 is inserted, and the tip thereof is pushed until it abuts the stopper plate 25.

Then, the push rod 28 is raised by reactivating the cylinder 29 of the operation unit 27. Then, the biasing force of the compression spring 41 causes the two leaf collets 39, 39 to move in a direction in which they approach each other (chucking direction), whereby the two collet portions 37, 37 of the chuck member 38 are reduced in diameter and work. W is chucked in two places. After that, the stopper plate 25 is lowered by reactivating the lifting cylinder 23 of the stopper device 22, and the right tailstock device 17B is advanced to the original position by the operation of the advancing / retreating cylinder 21. Cylinder of pushing device 17A, 17B
Both centers 18 are moved forward by the operation of 19 to support the work W from both ends.

Next, the chuck device 1 is rotated by the operation of the servo motor 9. Then, since the connecting point (vertex of the mountain) of the two links 43, 44 connecting the left and right leaf collets 39, 39 is a free end, a large centrifugal force acts on the connecting point, and the left ・The right leaf collets 39, 39 are attracted to each other by a force that doubles the biasing force of the compression spring 41, and the tightening force of the collet portions 37, 37 of the chuck member 38 increases.
Under this condition, the left and right turrets 12A,
12B actuates simultaneously, and the two cutting tools 13, 13 approach both ends of the work W and execute machining simultaneously. After the processing is completed, the chuck device 1 is stopped at a fixed position by the signal from the sensor 31, the push rod 28 of the operation unit 27 is lowered, and the two leaf collets 39, 39 are moved through the link mechanism 42 in the same manner as described above. Slide 39 in the unchucking direction. Further, by the operation of the advancing / retreating cylinder 21, the right tailing device 17B is retracted from the original position, and the workpiece W is extracted from the chuck device 1, and the both-end machining is completed.

In the chuck device 1, especially on the left
Since the link mechanism 42 that connects the right leaf collets 39, 39 is composed of two mountain-shaped links 43, 44, a large centrifugal force acts on this, and therefore the left and right leaf collets 39, 39 are chucked. As the compression spring 41 for urging in the direction, a small one can be used, and the chuck device 1 can be miniaturized. The number of link mechanisms 42 is arbitrary, and three or more may be provided. However, in order to prevent the rotation of the chuck device 1 from becoming unbalanced, it is necessary to provide the leaf collet 39 at positions equidistantly arranged in the circumferential direction. Further, in the turning device, the tailing devices 17A and 17B are arranged on both sides of the chuck device 1 so that the work W is supported by both the centers 18, so that a long work W may be used. Deflection during processing is suppressed,
The desired processing precision can be guaranteed. The tailing device is not necessary when the short work W is symmetrical.

[0025]

As described above in detail, according to the chuck device of the present invention, since the rod-shaped work can be reliably chucked at two places, it can be used as a main shaft. Some have high value. Further, according to the turning device of the present invention, the chuck device is used as the main shaft, and the tool rests provided on both sides of the device can be operated to simultaneously process both ends of the work with high efficiency in a general turning manner. ,
Not only the range of application can be expanded, but also the productivity can be significantly improved.

[Brief description of drawings]

FIG. 1 is a front view showing the structure of a turning device according to the present invention.

FIG. 2 is a side view taken along the line A of FIG.

FIG. 3 is a side view taken along the line B of FIG.

FIG. 4 is a cross-sectional view showing the structure of a chuck device according to the present invention.

5 is a cross-sectional view taken along the line C-C of FIG.

6 is an enlarged sectional view of a D part of FIG.

FIG. 7 is a cross-sectional view showing how the chuck device is used.

[Explanation of symbols]

 1 chuck device 2 base 4 bearing 9 chuck device driving servo motor 12A cutting tool stand 12B cutting tool stand 13 cutting tool 17A tailing device 17B tailing device 27 operation unit 28 push rod 35 body 37A collet part 37B collet part 38 chuck member 39 leaf Collet 42 Link mechanism 43 Link 44 Link W Work

Claims (2)

[Claims] 1. A hollow chuck member having outer diameter gripping collet portions at both ends, and two leaf collets for expanding and contracting each of the collet portions by relative movement are provided in a tubular body. The two leaf collets are slidably fitted in the main body in the axial direction, and the two leaf collets are normally biased by a biasing means in a chucking direction for reducing the diameter of the collet portion. A chuck device, wherein a leaf collet is connected by a link mechanism so as to be relatively movable, and an operation hole for operating the link mechanism is provided in the main body. 2. A base for rotatably supporting the chuck device according to claim 1, drive means for rotating the chuck device, and the link mechanism operated through an operation hole of the chuck device to operate the two members. An operation means for relatively moving the leaf collet in the unchucking direction, and two tool rests for supporting a cutting tool for processing a work and moving the cutting tool to a processing position on both left and right sides of the chuck device are provided. Characteristic turning device.