JP2003225838A - Work piece clamping equipment for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide work piece clamping equipment enabling a manufacturing cost to be reduced by achieving compact and light-weighted index equipment, and enhancing the flexibility of a work piece surface to be processed. <P>SOLUTION: An index table 12 is reciprocally swivellingly supported on the top surface of a machine table 11, and work piece clamping equipment 6 is mounted via a mounting frame 15 on the top of a support member 14 fixed on the floor face. A swivel center shaft 25 is supported by the mounting frame 15, and a swivel support cylinder 30 is supported in a way that it can swivel around a swivel axis line by the swivel center shaft 25, and a pressure shaft 31 is penetrated and supported in a way that it can slide up and down relative to the swivel supporting cylinder 30. A clamping tool 17 is mounted on the lower end of the pressure shaft 31 and the swivel center shaft 25. A swivel force application mechanism 20, which makes the clamping tool 17 swivel using the swivel axis line as the center, is mounted on the support member 14. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work clamp device for a machine tool.

[0002]

2. Description of the Related Art Generally, in a machine tool, a work is fixed to a predetermined position on a non-rotatable table by a clamp device to machine the work, and an index device is used to rotate the work. There is a method of performing processing on a plurality of processed surfaces. In the latter machine tool using the index device, a clamp device for clamping a work from above is mounted on the upper surface of the index table so as to be rotatable in synchronization with the swing motion of the index table.

[0003]

However, since the above-described conventional work clamp device has a structure in which the work and the clamp device are swung on the index table, it is necessary to swivel a heavy weight clamp device, which is large. There was a problem that the index table of was needed.

Further, since the supporting member which constitutes the clamp device and extends in the vertical direction interferes with the working tool, there is a work surface that cannot be machined, or the space for moving the working tool back and forth is restricted, so that the work is machined. There was also a problem that the degree of freedom of the surface was reduced.

Further, since the conventional work clamp device is required to rotate and move, it is necessary to move pipes and wires to a clamp cylinder, a position detecting switch, etc., so that maintenance and inspection work is troublesome and durability is improved. There was also the problem that it was difficult.

The former work clamp device does not have the problems of the latter work clamp device. INDUSTRIAL APPLICABILITY The present invention can solve the problems existing in the above-mentioned conventional techniques, can reduce the size and weight of the index device, can improve the degree of freedom of the work surface of the work, and can further fix the piping and wiring. It is to provide a work clamp device for a machine tool that can be realized.

[0007]

In order to solve the above problems, the invention according to claim 1 supports an index table on a machine base so as to be rotatable about a vertical axis, and straddles the index table. A clamp jig that is provided on a support member that is erected so as to be pressed by the work supported on the upper surface of the index table is mounted by a swivel support mechanism so that the position can be switched between a plurality of clamp positions, and The gist of the present invention is that a plurality of clamping force applying mechanisms for clamping the work by pressing the clamp jig whose position has been switched downward are provided on the upper part of the member.

According to a second aspect of the present invention, in the first aspect, the swivel support mechanism of the clamp jig has a swivel center shaft that is vertically immovably supported at a predetermined position above the support member, and A revolving support cylinder supported so as to be capable of reciprocating reciprocating horizontally about the revolving axis about the revolving axis and immovable in the up and down direction, and reciprocating vertically in a revolving tubular portion of the revolving support cylinder. With a supported pressing shaft,
The clamp jigs are attached to the lower ends of the turning center shaft and the pressing shaft so that they can be turned around the turning axis of the turning center shaft by the turning motion of the pressing shaft and can be moved up and down by the lifting motion of the pressing shaft. The gist is that a turning force applying mechanism is provided between the clamp jig and the support member or the index table.

According to a third aspect of the present invention, in the second aspect, the plurality of clamping force applying mechanisms are a plurality of clamping cylinders arranged downward at a plurality of predetermined positions on the upper portion of the support member, and the plurality of clamping cylinders. A plurality of gripping mechanisms capable of engaging and gripping a locking flange formed at the upper end of the pressing shaft with respect to the lower end of the accompanying piston rod,
The gist of the present invention is that a guide mechanism for guiding and moving the locking flange of the pressing shaft lifted upward together with the clamp jig is provided between the gripping mechanisms.

The invention according to claim 4 is the invention according to claim 2 or 3.
In the lower ends of the swivel center axis and the pressing shaft, the swivel motion of the pressing shaft can be swiveled around the swivel central axis, and the swivel central axis is moved along the vertical reciprocating motion of the pressing shaft. A gist is that a mounting board that is guided and moved is provided, and a clamp jig is mounted on the mounting board via a floating mechanism so as to be slightly swingable.

According to a fifth aspect of the present invention, in any one of the second to fourth aspects, the turning force applying mechanism is provided between the support member and the clamp jig, and the clamp jig or A guide rod that is directed downward is provided on the mounting substrate, and an engaging metal fitting attached to a column that is reciprocally mounted on the support member is movable in the vertical direction relative to the guide rod and is horizontally movable. The point is that they are linked so that they can move relative to each other.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a work clamp device embodying the present invention will be described below with reference to FIGS.

As shown in FIG. 1, an index table 12 is mounted on a machine base 11 on the upper surface of a bed 10 so as to be capable of reciprocating rotation by a servo motor (not shown) around a rotation axis O1 extending in the vertical direction. A plurality of work support tools 13 for supporting the lower surface of the work W are provided above the index table 12.

Arch-shaped support members 14 are erected on both left and right sides of the index table 12 so as to straddle the index table 12. A mounting frame 15 is mounted on the upper portion of the support member 14. The mounting frame 15 includes a pair of left and right side walls 15a and 15b, and a connecting wall 1 integrally connected to the lower ends of the side walls 15a and 15b.
5c and a top plate 15d bridged between the upper ends of the side walls 15a and 15b. A work clamp device 16 is provided on the support member 14 and the mounting frame 15.
Is installed.

The work clamp device 16 clamps the upper surface of the work W and a clamp jig 17 and a jig pivot support for reciprocally pivoting the clamp jig 17 about a pivot axis O2 extending in the vertical direction. The mechanism 18 is provided. Further, the work clamp device 16 is provided with a pressing shaft 3 which will be described later while the clamp jig 17 is rotating.
A guide mechanism 19 for guiding and moving 1 together with the clamp jig and a turning force applying mechanism 20 for applying a turning force to the clamp jig 17 are provided. Further, the work clamp device 16 applies a downward pressing force to the clamp jig 17 to clamp the work W while the clamp jig 17 is switched to the first clamp position P1 of the work. First clamping force applying mechanism 2
1 is provided. This work clamp device 16 is a second clamping force applying mechanism for applying downward pressing force to the clamp jig 17 in a state where the clamp jig 17 is switched to the second clamp position P2 of the work. 22
It has and. The clamp jig 17 is the upper mounting plate 1
7a and a clamper 17b fixed to the lower surface of the upper mounting plate 17a by hanging.

Therefore, the above-mentioned mechanisms will be sequentially described below. (Jig swivel support mechanism 18) A swivel center shaft 25 is supported by a tapered roller bearing 26 at a predetermined position on the connecting wall 15c of the mounting frame 15 so as to be immovable in the vertical direction and rotatable at a predetermined position. A mounting substrate 27 is horizontally supported at the lower end of the turning center shaft 25 via a slide bearing 28. A base end boss portion 30a of a swivel support cylinder 30 is rotatably supported at an intermediate portion in the vertical direction of the swivel center shaft 25. The swivel cylinder portion 30b of the swivel support cylinder 30 is mounted so as to be capable of reciprocating horizontal swivel about the swivel axis O2 of the swivel center shaft 25 and immovable in the vertical direction, and supports the pressing shaft 31. . The small-diameter portion 31a formed at the lower end of the pressing shaft 31 has the key 3
It is penetrated through the insertion hole 27a of the mounting substrate 27 through the non-rotatable structure. The clamp jig 17 is supported on the small-diameter portion 31a via a floating bearing 34 that constitutes a floating mechanism so as to be slightly floatable so as to uniformly press the clamp surface of the work.
The nut 35 prevents it from coming off. A connecting pin 36 is inserted into the mounting board 27 and the upper mounting plate 17a as shown in FIG. 1 to prevent relative rotation of both members. The turning radius of the pressing shaft 31 is set by the horizontal distance between the turning axis O2 and the pressing axis O3 of the pressing shaft 31. In this embodiment, the turning axis O1 and the turning axis O2 are set on the same straight line.

(First and second clamping force applying mechanisms 21,
22) Next, the first and second clamping force applying mechanisms 2
6, the first and second clamp cylinders 41, 42 are arranged parallel to each other at a predetermined interval in the horizontal direction and downwardly on the top surface of the top plate 15d of the mounting frame 15. It is installed. At the lower end of the piston rod 43 of the first clamp cylinder 41, a first gripping mechanism 44 capable of engaging a neck 31b formed at the upper end of the pressing shaft 31 and a locking flange 31c is mounted. The first gripping mechanism 44 includes an upper grip fitting 45 fitted and fixed to a small diameter portion 43a formed at the lower end of the piston rod 43, and a lower grip fitting fixed to the lower surface of the upper grip fitting 45 with a bolt. And 46.

A holding recess 46a of the lower holding metal fitting 46
When the pressing shaft 31 is moved to the first clamp position P1, one end is open and the other end is closed so that the locking flange 31c formed at the upper end of the pressing shaft 31 can enter. The first gripping mechanism 44 is provided on the piston rod 4
Although it is moved up and down together with 3, it is constructed so as not to rotate.

The same members as the above-mentioned first gripping mechanism 44, upper gripping metal fitting 45 and lower gripping metal fitting 46 are mounted on the lower end of the piston rod 47 of the second clamp cylinder 42. That is, the second gripping mechanism 48 is attached to the lower end of the piston rod 47. The second gripping mechanism 48 includes an upper grip metal fitting 49 fitted and fixed to a small diameter portion 47a formed at the lower end of the piston rod 47,
The lower grip member 50 is fixed to the lower surface of the upper grip member 49 with bolts. When the pressing shaft 31 is moved to the second clamp position P2, one end of the holding recess 50a of the lower holding metal fitting 50 is opened so that the locking flange 31c of the pressing shaft 31 can enter, and the other end is closed. There is. The second gripping mechanism 48 is configured to move up and down together with the piston rod 47, but not to rotate.

The upper grip fitting 45 of the first gripping mechanism 44 is
A detection mechanism is provided for detecting the vertical position of the upper grip fitting 45, that is, whether the clamp jig 17 and the pressing shaft 31 are in the clamp position or the unclamp position. This detection mechanism, as shown by the chain line in FIG.
A support rod 51 attached to the upper grip 45, a dog 52 attached to the tip of the support rod, and a pair of proximity switches 53 attached to the top plate 15d side at predetermined intervals in the vertical direction via a bracket (not shown). , 54. The second gripping mechanism 48 is also provided with a detection mechanism similar to the above-mentioned detection mechanism as shown by the chain line in FIG.

(Guide mechanism 19) The guide mechanism 19 has a predetermined height by the first clamp cylinder 41 or the second clamp cylinder 42 when the pressing shaft 31 and the clamp jig 17 are in the first clamp position or the second clamp position. In the unclamped state in which the pressing shaft 31 is lifted to the predetermined position, the pressing shaft 31 is guided along a predetermined turning locus having a planar arc shape. That is, the locking flange 31c of the pressing shaft 31 is guided and moved along the guide rail 61 disposed in an arc shape between the lower grip fitting 46 and the lower grip fitting 50, and the lower grip fitting 46 (first It guide-moves from the clamp position P1) to the lower grip fitting 50 (second clamp position P2) and vice versa.

(Turning force imparting mechanism 20) Next, referring to FIGS.
The configuration of the turning force applying mechanism 20 will be described with reference to FIGS.

A mounting plate 71 is horizontally bridged at an intermediate height position of the support member 14 as shown in FIGS. A pair of upper and lower guide rods 72 are supported on the mounting plate 71 in parallel with each other and in the horizontal direction. A movable support body 73 is mounted on both guide rods 72 so as to be capable of reciprocating in the horizontal direction, and a column 74 is provided upright on the movable support body 73. An engagement fitting 75 is attached to the upper end of the column 74. On the lower surface of the mounting board 27, a guide rod 76 extends downward and penetrates into a guide recess 75a formed in the engaging fitting 75. As shown in FIG. 7, the guide concave portion 75a is formed in a U-shape in a plane, and allows the relative movement of the guide rod 76 in the horizontal direction and the relative movement of the engaging fitting 75 and the guide rod 76 in the vertical direction. It is supposed to do. A bracket 77 is attached to the lower surface of the attachment plate 71, and a cylinder 78 is horizontally supported at the tip thereof. This cylinder 7
A connecting member 80 is attached to the tip of the piston rod 79 of No. 8, and the connecting member 80 is connected to the movable support 73.

Therefore, when the piston rod 79 of the cylinder 78 is reciprocated, the movable support 73 is reciprocated along the guide rod 72, and the support column 74 and the engaging fitting 75 rotate the guide rod 76. Therefore, the clamp jig 1
7, the mounting substrate 27, the pressing shaft 31, etc. are swung around the swivel axis O2 of the swivel center shaft 25. (Operation of Work Clamp Device) Next, the operation of the work clamp device configured as described above will be described.

1 and 2, the work W is supported by the work support 13 on the upper surface of the index table 12, the pressing shaft 31 is pivotally moved to the first clamp position P1, and the engaging flange 31c of the pressing shaft 31 is moved. The state where the lower grip metal fitting 46 is engaged is shown. Further, the piston rod 43 of the first clamp cylinder 41 is moved downward, the mounting substrate 27 and the clamp jig 17 are moved downward, and the upper surface of the work W is pressed by the first clamp position P1. In this state, the front surface (right side surface in FIG. 2) of the work W is processed by a processing tool such as a drill. When this processing operation is completed, the piston rod 43 of the first clamp cylinder 41 is lifted, the pressing shaft 31 is lifted, and the mounting substrate 27 and the clamp jig 17 are lifted from the clamp position to the unclamp position. At this time, the mounting substrate 27 is guided and moved upward along the turning central axis 25 by the action of the slide bearing 28. The lower grip fitting 46 of the first gripping mechanism 44 lifted to the unclamp position is the guide rail 6
It is stopped at the same height as 1.

When this unclamping operation is completed, the index table 12 is swung clockwise by a predetermined angle (90 degrees in this embodiment) in FIG. 7 by a servo motor (not shown), which is the next machining surface of the work W. The side surface is switched to the front surface. On the other hand, the turning force applying mechanism 2 is synchronized with the turning motion of the index table 12.
The 0 cylinder 78 is actuated, the movable support 73 is moved along the guide rod 72, and by the above-described operation,
The mounting board 27, the clamp jig 17, and the pressing shaft 31 are swiveled 90 degrees clockwise in FIG. 7 about the swivel axes O1 and O2. Therefore, the position of the clamp jig 17 with respect to the work W is switched from the first clamp position P1 described above to the second clamp position P2.

On the other hand, immediately after this clamp position switching operation is started, the locking flange 31c of the pressing shaft 31 is provided.
Is released from the grip recess 46a, and then the locking flange 31
c is guided and moved along the guide rail 61 of the guide mechanism 19 to the grip recess 50a of the second grip mechanism 48. In this state, when the second clamp cylinder 42 is actuated and its piston rod is moved downward, the pressing shaft 31, the mounting substrate 27 and the clamp jig 17 are moved downward and held at the second clamp position P2. The upper surface of the held work W is pressed by the clamp jig 17, and the work is held at the second clamp position P2.

As described above, the workpiece clamped at the second clamp position P2 is subjected to the second machining by moving the machining tool such as a drill (not shown) forward.
When this processing operation is completed, the second clamp cylinder 42
The piston rod 47 is lifted upward, and the clamp jig 17 is moved and held from the clamp position to the unclamp position.

According to the work clamp device of the above embodiment, the following features can be obtained. (1) In the above embodiment, the index table 12 for supporting the work W is rotatably supported on the upper surface of the machine base 11, while the work W is supported by the support member 14.
The work clamp device 16 for pressing and clamping the upper surface of the was attached. Therefore, the index table 1
It is possible to reduce the size and weight of the index table 12 by minimizing the power required to rotate the index table 2.

(2) In the above embodiment, the jig swivel support mechanism 18 and the guide mechanism 19 are mounted on the upper portion of the support member 14,
The clamp jig 17 is rotated by the turning force applying mechanism 20 mounted on the support member 14 in synchronization with the turning movement of the work W. For this reason, the position of the support member 14 does not change, the forward movement or the backward movement of the processing tool is not restricted, and the degree of freedom of the processing surface can be improved. Further, the work clamp device 16 can fix pipes and wirings that require flexibility, improve their durability, and can easily perform maintenance and inspection.

(3) In the above embodiment, the clamping force of the work W is changed by using the first clamp cylinder 41 and the second clamp cylinder 42 having different capacities. Therefore, according to the change of the processing surface of the work W, an appropriate clamping force is applied to the work to stabilize the clamped state, and the work W can be processed accurately and properly.

(4) In the above embodiment, the mounting substrate 27 is mounted on the lower ends of the turning center shaft 25 and the pressing shaft 31, and the clamp jig 17 is mounted on the lower end of the pressing shaft 31 via the floating bearing 34. did. Therefore, when the workpiece is clamped by the clamping jig 17, the lower end surface of the clamping jig 17 can be appropriately pressed against the upper surface of the workpiece, and the workpiece can be stably clamped. .

(5) In the above embodiment, the first clamp cylinder 41 and the second clamp cylinder 42 are mounted downward on the mounting frame 15, and the lower grip 4 is attached to the lower ends of the piston rod 43 and the piston rod 47.
6 and the lower grip 50. Further, a guide rail 61 for guiding and moving the locking flange 31c of the pressing shaft 31 is provided in a state where both the lower grip fittings 46 and the lower grip fitting 50 are held at the unclamp position. Therefore, the pressing shaft 31
The clamp position switching operation can be easily performed with a simple configuration.

(6) Since the work clamp device 16 and the index table 12 are separated in the unclamped state, it is not necessary to match the turning angles of the pressing shaft 31 and the index table 12.

Another embodiment of the work clamp device embodying the present invention will be described below with reference to FIGS. 8 and 9. Since this embodiment has a configuration in which the turning force imparting mechanism 20 of the work clamp device of the above-described embodiment is changed, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

In this embodiment, the turning operation shaft 91 is erected upward with respect to the outer peripheral surface of the second clamp cylinder 42, and the turning operation shaft 9 is set to the clamp jig 17.
The upper end portion of 1 is horizontally cantilever-supported by an actuated element 92 having a recess 92a that allows relative movement in the vertical and horizontal directions.

Therefore, according to this embodiment, the following characteristics can be obtained in addition to the characteristics described in the above embodiments. In the above embodiment, the structure of the turning force imparting mechanism 20 can be simplified, the manufacturing and assembling work can be easily performed, and the cost can be reduced.

In this embodiment, the turning angles of the clamp device 16 and the index table 12 are the same. The present embodiment may be modified as follows.

In the above embodiment, the first and second clamp cylinders 41 and 42 having different sizes are used, but they may be clamp cylinders having the same size. or,
Clamp cylinders may be provided at three or more positions to change and hold the posture of the work W at three or more positions.

The floating bearing 34 may be omitted.

[0041]

As described in detail above, according to the present invention, the index device can be made smaller and lighter to reduce the manufacturing cost, and the degree of freedom of the work surface of the work can be improved. The wiring can be fixed to improve its durability.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a work clamp device of a machine tool as seen from the back side.

FIG. 2 is a left side sectional view of the work clamp device.

FIG. 3 is a plan view of a work clamp device.

FIG. 4 is a plan view showing a guide mechanism of a pressing shaft.

FIG. 5 is a plan view of the vicinity of a swivel support cylinder.

FIG. 6 is a vertical sectional view showing first and second clamping force applying mechanisms.

FIG. 7 is a plan view showing a turning force applying mechanism.

FIG. 8 is a front view of a work clamp device according to another embodiment of the present invention.

9 is a left side sectional view of the work clamp device shown in FIG.

[Explanation of symbols]

W ... Work, O1, O2 ... Swivel axis, 11 ... Machine stand, 12
... index table, 14 ... support member, 17 ... clamp jig, 19 ... guide mechanism, 20 ... turning force applying mechanism, 2
5 ... Revolving central axis, 27 ... Mounting board, 30 ... Revolving support tube,
30b ... Revolving cylinder part, 31 ... Pressing shaft, 31c ... Locking flange, 43, 47, 79 ... Piston rod, 72, 76 ...
Guide rods, 74 ... stanchions, 75 ... engaging metal fittings.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroyuki Tanabe             100 Fukuno-cho, Tonami-gun, Toyama Prefecture Co., Ltd.             Nippira Toyama Toyama Factory F-term (reference) 3C016 CA05 CB02 CB11 CC01

Claims (5)

[Claims] 1. A workpiece supported on a top surface of the index table, the index table being supported on a machine base so as to be rotatable about a vertical axis, and provided on a support member standing upright so as to straddle the index table. A clamp jig that is pressed against is mounted by a swivel support mechanism so that the position can be switched between a plurality of clamp positions, and the position-switched clamp jig is pressed downward on the upper part of the support member to clamp the workpiece. Work clamp device in a machine tool provided with a plurality of clamping force applying mechanisms. 2. The swivel support mechanism of the clamp jig according to claim 1, wherein the swivel support mechanism is vertically immovably supported at a predetermined position on the upper portion of the support member, and the swivel center shaft is pivoted with respect to the swivel center axis. A swivel support cylinder supported so as to be capable of horizontally reciprocating swivel around an axis and immovable in the vertical direction, and a pressing shaft supported by a swivel cylinder portion of the swivel support cylinder so as to be vertically reciprocable. The clamp jig is provided at the lower ends of the swivel center axis and the pressing shaft so that the clamp jig can swivel around the swivel axis of the swivel central axis by the swiveling motion of the pressing shaft and can move up and down by the lifting motion of the pressing shaft. Installed,
A work clamp device in a machine tool, wherein a turning force applying mechanism is provided between the clamp jig and a support member or an index table. 3. The plurality of clamping force applying mechanisms according to claim 2, wherein the plurality of clamping cylinders are provided downward at a plurality of positions at predetermined positions on the upper portion of the support member, and lower end portions of piston rods attached to the plurality of clamping cylinders. On the other hand, a plurality of gripping mechanisms capable of engaging and gripping the locking flange formed on the upper end portion of the pressing shaft are provided, and between the gripping mechanisms, the pressing shaft lifted upward together with the clamp jig is provided. A work clamp device in a machine tool provided with a guide mechanism for guiding and moving a locking flange. 4. The revolving center shaft and the pressing shaft are reciprocally movable at the lower ends of the revolving center shaft and the pressing shaft by the revolving motion of the pressing shaft about the revolving central shaft, and the reciprocating motion of the pressing shaft in the vertical direction. A work clamp device for a machine tool, in which a mounting board is provided that is guided and moved on the central axis of rotation in response to movement, and a clamp jig is mounted on the mounting board via a floating mechanism so as to be slightly swingable. . 5. The method according to any one of claims 2 to 4,
The turning force applying mechanism is provided between the support member and the clamp jig, and the clamp jig or the mounting substrate is provided with a guide rod directed downward, and is mounted so as to be reciprocally movable with respect to the support member. Work clamp device in a machine tool in which an engagement fitting attached to a fixed column is linked to the guide rod so as to be vertically movable and horizontally movable.