JPH09123006A - Chuck mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chuck mechanism for a simple both end cutting work machine capable of being rotated with a pillar shape workpiece clamped at both ends so that it can be cut without re-clamping it and also being easily clamped in a single operation. SOLUTION: A chuck mechanism, which is provided with a body of rotation 2 including a hollow space for inserting a pillar shape workpiece W and a mechanism for clamping the workpiece W in the interior of the hollow space with the workpiece W sticking out from the axial ends of the hollow space of the body of rotation 2, is a clamping mechanism for a both end cutting work machine for cutting both ends of the workpiece W by turning the workpiece together with the body of rotation 2. The clamping mechanism, which includes a claw member 5 and a tapering 6 which gives the claw member displacement to the inner and outer diameter direction and includes a tapered surface where the tapered surface of the claw member comes in contact, gives tapering 6 displacement by displacing a movable substance 9 in the axial direction and the displacement of the tapering 6 in the axial direction is converted to the displacement in the diameter direction of the claw member through the tapered surface of the claw member, thereby clamps the workpiece by the inner circumference of the claw member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for applying a cutting process to both axial ends of a workpiece while chucking the cylindrical workpiece, and in particular, by chucking the central portion of the workpiece in the apparatus, The present invention relates to a chuck mechanism that can perform cutting on both ends of a work protruding from the device without grasping the work.

[0002]

2. Description of the Related Art In the case where machining such as cutting and grinding is applied to both ends in the axial direction of a columnar or other columnar work, conventionally, as shown in FIG.
The processing method using the apparatus as shown in FIG. That is, this processing apparatus is based on the base shaft 1 rotatably supported between the grip member 102 of the lathe 101 and the center 103.
04 has a chuck mechanism having a structure in which fixed sleeves 105 and O-rings 106 are alternately arranged on the outer peripheral surface, and the work W is set on the outer periphery of this chuck mechanism before the nut 107
After fixing the work W by means of, the one end of the work W was processed by a cutting means (not shown). When the machining of one end is completed, the work is removed from the base shaft 104 manually or by a robot, and the work is inverted and then set again on the base shaft 104 to machine the other end. However, when the work is gripped like the above-mentioned conventional example, it takes a long time to grip, resulting in poor machining efficiency.
There is also a problem that the work is damaged when the grip is replaced. Further, in the above-mentioned conventional method, when the work W is detached from the base shaft 104, the center 103 is moved rearward (leftward) until the work comes out of the grip member 102, and the nut 7 is loosened. Since the work W has to be removed, it takes more time to remove the work, the total work time is increased, and the operating rate of the apparatus is lowered.

[0003]

As means for solving such a problem, Japanese Patent Application Laid-Open No. 58-120401 discloses a plurality of chucks that move in and out in a radial direction inside a hollow headstock, and the chucks are used to remove the problems. By holding and rotating the central part (non-end part) of the cylindrical work inserted in the hollow part, the work is grasped and reversed without being reversed.
A technique is disclosed that enables both ends of a workpiece to be processed simultaneously. However, this conventional technique has disadvantages such as a complicated structure, a large number of parts, an increase in cost, and an increase in failure rate. SUMMARY OF THE INVENTION The present invention has been made in view of the above, and its object is to provide a columnar work without causing problems such as a complicated structure, an increase in cost due to an increase in the number of parts, and an increase in failure occurrence rate. An object of the present invention is to provide a chuck mechanism for a double-sided cutting machine having a simple mechanism that can rotate in a clamped state so that it can be cut without grasping both ends and can be easily clamped with one touch.

[0004]

In order to solve the above-mentioned problems,
According to the invention of claim 1, a rotating body having a hollow portion into which a columnar work is inserted, a fixed body rotatably supporting the rotating body, and an axial direction of the hollow portion in the hollow portion of the rotating body. A clamp mechanism is provided for clamping the work in the hollow portion of the rotating body in a state where the work protrudes from both ends, and the work is rotated at the both ends to process both ends of the work. A chuck mechanism of a double-end cutting machine, wherein the clamp mechanism is disposed inside the rotating body so as to be movable in the inner and outer radial directions, and a claw member having a taper surface on an outer peripheral surface, and the claw member. By displacing the movable body in the axial direction, the taper ring has a taper surface that is movable in the axial direction to give a displacement in the inner and outer diametrical directions and has a tapered surface that contacts the tapered surface of the claw member. , The taper ring is displaced and the taper surface of the claw member is To te - the displacement in the axial direction of Paringu converted into displacement in the radial direction of the claw member, the follower by the inner peripheral surface of the pawl member - is characterized in that so as to clamp the click.

According to a second aspect of the present invention, a space is provided between the movable body which can be displaced in the axial direction and the cap fixed to the fixed body, and air is supplied to the space to move the movable body. It is characterized in that the axial displacement is applied to. According to a third aspect of the present invention, a clearance is provided between the movable body and the rotating body, a slide bearing is provided between the movable body and the cap, and a clearance is provided between the fixed body, the movable body and the cap. An O-ring is provided on each of the sliding parts. The invention of claim 4 is characterized in that a bearing is provided between the movable body and a pushing member for pushing the tapering. A fifth aspect of the present invention is characterized in that a compression spring that displaces the tapering outward in the axial direction is provided facing the pushing member.

According to a sixth aspect of the present invention, the fixed body and the rotating body are assembled via the bearing, and the rotating body is rotated by a pulley and a belt fixed to the rotating body. . The invention of claim 7 is characterized in that a plurality of the claw members are arranged at equal intervals in the circumferential direction. The invention of claim 8 is characterized in that an elastic pad is provided on a part of the claw member which is elastically displaceable in the radial direction, and the outer peripheral surface of the work is clamped by the pad. The invention of claim 9 is characterized in that a taper made of an elastic body or a supporter having an arc-shaped cross section is provided at the center of the inside of the rotating body. The invention of claim 10 is characterized in that the clamp mechanism is provided at both axial end portions of the rotating body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings. 1 (a) and 1 (b) are a longitudinal sectional view and a side view showing an overall configuration of an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part. The chuck mechanism includes a fixed body 1 fixed to the main body of the apparatus, a rotating body 2 rotatably supported and driven by the fixed body 1, and a clamp mechanism for holding a work W, which is a cylindrical member, in a clamped state. Is roughly divided into The rotating body 2 has a hollow portion that penetrates in the axial direction, and the work W is inserted into the hollow portion. The supporter 3 made of a material having a good slip property is provided on the inner wall of the hollow portion at the axial center position.
(Taper or an elastic body having an arc-shaped cross section) is projected, and the work W can be smoothly inserted into the hollow portion due to the presence of the supporter 3, and an elastic body (pad) described later. The claw member 5 having 4 is configured to hold the outer peripheral surface of the work W by the elastic body 4 by pinching and holding it by moving in the inner diameter direction by moving the taper ring 6 inward in the axial direction. The fixed body 1 is a hollow body, and a rotating body 2 is rotatably supported by a bearing 7 inside the hollow body of the fixed body 1. An annular cap 8 is fixed to both axial end portions of the inner wall of the hollow portion of the movable body 3, and an annular movable body 9 is supported inside the cap 8 so as to be movable in the axial direction. It is configured to move integrally with the pushing member 11 in the axial direction via the bearing 10. The inner peripheral surface of the movable body 9 is in sliding contact with the outer periphery of the axially outer end portion of the rotating body 2.

Inside the both axial end portions of the rotating body 2, there are annular claw members 5 arranged so as to be movable in the inner and outer radial directions, respectively.
An elastic body (pad) 4 fixed to the inner peripheral surface of the claw member 5,
Via the compression spring 15 wound around the outer peripheral surface of the claw member 5 and arranged, the tapered surface 5a formed on the outer circumferential body peripheral surface of each claw member 5, and the tapered surface 5a and the ring 16. And a taper ring 6 arranged so as to be movable in the axial direction. The compression spring 15 is in contact with the axially inner end surface of the taper ring 6 at one end,
The protrusion 11a located at the inner end portion of is in contact with the outer end surface of the taper ring 6. Therefore, as shown in FIG. 2, when the pushing member 11 moves inward in the axial direction, the projection 11a presses the taper ring 6 inward in the axial direction against the spring 15, so that the taper surface 6a inside the taper ring 6 is pressed. The claw member 5 is urged in the inner diameter direction via the ring 16 provided, and the elastic body 4 clamps the outer peripheral surface of the work W.
The clamp mechanism composed of the above-mentioned components, particularly the claw member 5, the taper ring 6 and the like are arranged at 120 ° intervals in this embodiment, but this is merely an example.

When not in operation, the drive source for moving the pushing member 11 which is urged outward in the axial direction by the spring 15 and is in the state shown in FIG. 1 to the inside in the axial direction to shift to the chuck state shown in FIG. There are various possible methods, and hydraulic pressure, pressing force by a motor, etc. can be adopted. In this embodiment, an example in which pressure by compressed air is adopted is shown. That is, by supplying compressed air through the air-supply pipe 20 to the space between the cap 8 fixed to the fixed body 1 and the movable body 9,
Moves axially inward. At this time, the pushing member 11 attached to the movable body 9 via the bearing 10 moves inward in the axial direction together with the movable body 9 to move the tapering 6 to the spring 1.
Push inward in the axial direction against 5. The taper ring 6 pushed inwardly displaces the claw member 5 through the ring 16 in the inner diameter direction through the taper 5a of the claw member 5, so that the elastic body 4 provided on the claw member 5 works. W will be clamped. The rotating body 2 is supported by the fixed body 1 via a bearing 7 while the work W is clamped, and a motor (not shown) is attached via a pulley 21 and a belt 22 fixed to the rotating body 2. While rotating the work W, the bite 23 set at a predetermined position is moved in the radial direction of the work W,
Both ends of the work W are cut and finished to a predetermined size. When releasing the chuck, the compressed air is exhausted and the pushing member 11 is returned to the position shown in FIG. That is,
After processing, when compressed air is exhausted from the pipe 20, the compression spring 15
As a result, the tapering 6 is pushed outward in the axial direction, the pawl member 5 elastically returns to its original state, and the clamp is released. At this time, the pushing member 11 and the movable body 9 are also pushed in the axial direction by the tapering 6 to return to the original state. The chuck mechanism (reference numerals 4, 5, 6, 8, 9, etc.) is 12 in the above embodiment.
Although it is composed of three groups of members arranged at 0 degree intervals, it goes without saying that these members operate in synchronization with a drive source such as air. Reference numeral 25 is a plain bearing, and 26 is an O-ring for increasing airtightness.

As described above, according to the present chuck mechanism,
It is possible to easily perform the cutting work and the fixed-size finishing work on both ends of the work in the axial direction at the same time without changing the grip and without damaging the work.
The workpiece to be chucked according to the present invention is not limited to a columnar shape, and may be a polygonal pillar, which means that it can be generally applied to a columnar body. Further, the chuck mechanism may be provided not only at both axial end portions of the rotating body 2 as in the above embodiment, but also at a position further displaced inward in the axial direction. If it is provided at both ends in the axial direction, it becomes possible to chuck a long work. The shape, position, etc. of the compression spring 15 are not limited to those illustrated. The driving method of the rotating body 2 is not limited to the method of using the pulley and the belt, and various forms such as a gear and a chain can be adopted. The elastic pad 4 is not limited to the one having a circular cross section as shown in the drawing, but various types such as a plate and an ellipse can be adopted.

[0011]

As described above, according to the first aspect of the invention, the rotating body having the hollow portion into which the columnar work is inserted, the fixed body rotatably supporting the rotating body, and the rotating body are provided. The hollow part is provided with a clamp mechanism for clamping the work in the hollow part of the rotary body in a state where the work sticks out from both axial ends of the hollow part, and the work is rotated together with the rotary body. A chuck mechanism of a double-end cutting machine for processing both ends of the work, wherein the clamp mechanism is arranged inside the rotating body so as to be movable in the inner and outer radial directions and has a taper surface on an outer peripheral surface. The movable member, and a taper ring having a tapered surface that is movable in the axial direction to give a displacement to the inner and outer diameters of the claw member and that has a tapered surface that contacts the tapered surface of the claw member. By displacing the body in the axial direction, it changes to the tapering. The axial displacement of the tapering is converted into a radial displacement of the pawl member via the taper surface of the pawl member, and the work is clamped by the inner peripheral surface of the pawl member. As a result, both end faces can be processed with one clamp without grasping the work and rotating the work, and the work can be easily attached and detached. . Further, since no manual work is required for clamping and unclamping, automation can be easily performed and the efficiency of processing can be improved.

According to a second aspect of the present invention, a space is provided between the movable body which is displaceable in the axial direction and the cap fixed to the fixed body, and air is supplied to the space to move the movable body. Since the axial displacement is applied to the piston, the piston movement by the air can be performed without using a device such as an air-cylinder. Therefore, the structure can be simplified and the chuck itself can be made compact. Become. Moreover, since the factory air is used, no special work is required.

In the invention of claim 3, a clearance is provided between the movable body and the rotating body, a slide bearing is provided between the movable body and the cap, and the fixed body, the movable body and the In the invention of claim 4, wherein each sliding portion between the caps is provided with an O-ring, a bearing is provided between the movable body and the pressing member for pushing the taper ring. The fixed body and the rotary body are assembled through the bearing, and the rotary body is configured to rotate by the pulley and the belt fixed to the rotary body. Therefore, the movement of the movable body is smoothed, and The rotating body and the pressing member can be stably rotated. That is, the sliding bearing stably holds the movable body, and the bearing attached to the movable body can stably rotate.

According to the fifth aspect of the present invention, since the compression spring is provided facing the pushing member to displace the tapering outward in the axial direction, the clamp can be released smoothly and quickly. The transition to the process becomes easy. According to the invention of claim 7, since the plurality of claw members are arranged at equal intervals in the circumferential direction, the work can be stably clamped by arranging the plurality of claw members equally. In the invention of claim 8, an elastic pad is provided on a part of the claw member which is elastically displaceable in the radial direction, and the work outer peripheral surface is clamped by the pad. It will not hurt you. In the invention of claim 9, since a taper made of an elastic material or a support having an arc-shaped cross section is provided in the central portion of the inside of the rotating body, the work is smoothed by the elastic material supporter. It can be inserted into the chuck easily and can be processed in a stable state even during rotation. Claim 10
In the invention, since the clamp mechanism is provided at both axial ends of the rotating body, the long work can be stably clamped.

[Brief description of the drawings]

1A and 1B are a sectional view and a side view of an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1 (a).

FIG. 3 is an explanatory view of a conventional example.

[Explanation of symbols]

1 fixed body, 2 rotating body, 3 supporter, W work,
4 elastic body (pad), 5 claw members, 5a tapered surface, 6 taper ring, 7 bearing, 8 cap, 9 movable body, 10 bearing 11 pushing member, 1
5 compression springs, 16 rings, 21 pulleys, 22 belts, 23 bytes.

Claims (10)

[Claims] 1. A rotating body having a hollow portion into which a columnar work is inserted, and a fixed body rotatably supporting the rotating body.
The rotary body is provided with a clamp mechanism for clamping the work in the hollow portion of the rotary body in a state where the work sticks out from both ends of the hollow body in the axial direction. A chuck mechanism of a double-sided cutting machine for rotating both ends of the work by rotating together with the work, wherein the clamp mechanism is arranged inside the rotating body so as to be movable in the inner and outer radial directions and has a taper on the outer peripheral surface. A pawl member having a pawl surface, and a taper ring having a tapered surface that is movable in the axial direction in order to give the pawl member a displacement in the inner and outer radial directions and that is in contact with the tapered surface of the pawl member. Then, by displacing the movable body in the axial direction,
Displacement is applied to the paring, and the taper surface of the pawl member
A chuck mechanism, wherein displacement in the axial direction of paring is converted into displacement in the radial direction of the pawl member, and the work is clamped by the inner peripheral surface of the pawl member. 2. A space is provided between the movable body which is axially displaceable and a cap fixed to the fixed body, and air is supplied to the space so that the movable body can be displaced in the axial direction. The chuck mechanism according to claim 1, wherein the chuck mechanism is provided. 3. A clearance is provided between the movable body and the rotating body, a slide bearing is provided between the movable body and the cap, and sliding between the fixed body, the movable body and the cap. The chuck mechanism according to claim 2, wherein an O-ring is provided in each part. 4. The chuck mechanism according to claim 1, wherein a bearing is provided between the movable body and a pushing member that pushes the tapering. 5. The chuck mechanism according to claim 1, further comprising a compression spring facing the pushing member and displacing the tapering outward in the axial direction. 6. The fixed body and the rotary body are assembled through the bearing, and the rotary body is rotated by a pulley and a belt fixed to the rotary body. The chuck mechanism according to 3, 4, or 5. 7. A plurality of said claw members are arranged at equal intervals in the circumferential direction, 1, 2, 3, 4, 5.
Alternatively, the chuck mechanism according to item 6. 8. An elastic pad is provided on a part of the claw member that is elastically displaceable in the radial direction, and the pad is used as a work.
The chuck mechanism according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the outer peripheral surface of the chuck mechanism is clamped. 9. An elastic body is attached to a central portion of the inside of the rotating body.
The chuck mechanism according to claim 1, 2, 3, 4, 5, 6, 7, or 8, wherein a support having a cross section of a circular arc or a circular arc is provided. 10. The clamp mechanism is provided at both axial end portions of the rotary body.
The chuck mechanism according to 4, 5, 6, 7, 8 or 9.