JPH07237064A - Flexible machining jig - Google Patents

Abstract

PURPOSE:To shorten initial set-up change time by providing positioning pins or block devices and/or clamping devices each of which can be positioned optionally in the horizontal two-dimensional direction and has locking function for preventing dislocation after positioning. CONSTITUTION:Two sets of positioning reference pin devices each of which is formed of a reference pin 1, and a reference pin in-and-out driving hydraulic cylinder 2 and a link 2' built in a reference pin case 3 are installed in point symmetry around a workpiece W. The reference pin 1 is fitted into the reference hole of the workpiece W to position the workpiece W in a reference position. Four sets of clamping devices each of which is formed by connecting clamp metal 22, relative to reference metal 21 for supporting the machining load of cutting or the like and clamping force, to the rod of a clamp cylinder 23 by a link 22' are installed in point symmetry around the workpiece W. The workpiece W is fixed being clamped by these four sets of clamping devices.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible machining tool capable of mounting works, which are various kinds of workpieces such as cylinder heads, without changing jigs or jig parts, by easy step change. Regarding the ingredients.

[0002]

2. Description of the Related Art Jigs for dedicated machine tools and transfer machines have a fixed position corresponding to a reference hole or surface of a work, which is a work piece of many kinds such as a cylinder head, and a fixed position, and are different in different types of vehicles. When processing a work of a size, it was necessary to replace the jig 1 set or jig parts. Further, in an FMS line for mixed flow of several kinds of works, for example, a reference hole or surface of the work is common such that the position of the locate hole of the work fitted with the locate pin disclosed in JP-A-3-142140 is common. Jig, or Nissan Motor Co., Ltd., issued December 1986, "Nissan Giho" No.22 P1
In many cases, a jig with a common clamp position, such as a clamp seat, was used, as described in the lower right column of P151 of 50-156 "About FMS machining". However, both of these methods cannot handle different kinds of workpieces and have low flexibility.

As another prior art, for example, Japanese Utility Model Publication No. 62-
A device for changing the positioning pin pitch position by an eccentric shaft disclosed in FIG. 2 of JP-A-28365, JP-A-63-185.
No. 547, FIG. 1, two types of work positioning pin moving methods, and the shift method, disclosed in Japanese Utility Model Laid-Open No. 1-143329, changes clamp positions.
It is well known that the auxiliary knock pin corresponding to the fixed main knock pin disclosed in Fig. 2 of Japanese Patent Publication No. 3-73417 is movable in one direction, but the amount of movement of the positioning pin or the clamp position is small and various. It was not possible to handle workpieces and flexibility was low. FIG. 2 of Japanese Patent Laid-Open No. 3-66540 discloses a body assembly jig in which a locate pin is movable in three dimensions. A jig which receives a clamping load and a machining load such as cutting / grinding is disclosed. Since it does not have a lock function for preventing misalignment after positioning, it could not be used as a machining jig.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to enable setup change in a short time, a dedicated machine, a machining center,
The purpose of the present invention is to provide a flexible machining jig for machining such as cutting / grinding, which can be installed on a flexible transfer line (FTL) to form a more flexible machining line than conventional equipment. Another object of the present invention is to make it possible to mount workpieces, which are various kinds of workpieces, without changing jigs or jig parts, by easy step change.
It is to provide a flexible machining jig. A further object of the present invention is to provide a jig system that is low in initial cost and running cost without changing jigs or jig parts for many kinds of works. Still another object of the present invention is to provide a flexible machining jig capable of machining many kinds of works with high machining accuracy.

[0005]

Therefore, according to the present invention, the positioning reference pin or the block device and / or the positioning reference pin or the block device and / or the block device which can be arbitrarily positioned in the horizontal two-dimensional direction and which has the locking function for preventing the positional deviation after the positioning are provided. The problem of the prior art described above has been solved by providing a flexible machining jig characterized by having a clamp device.
With such a configuration, it is possible to provide a flexible machining jig capable of easily attaching works, which are various kinds of workpieces, by exchanging jigs or jig parts with easy steps. Preferably, the clamp device has a reference metal which is disposed at a position facing the clamp metal of the clamp device, is positionable in any horizontal two-dimensional direction together with the clamp metal, and holds a work with the clamp metal. The clamp device can be arbitrarily positioned in the vertical direction and has a locking function to prevent misalignment after positioning. With such a configuration, a flexible machining jig that can process various kinds of workpieces with high processing accuracy can be provided. It was

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the attached FIGS. 1 is a block diagram showing a configuration of a clamp device for a flexible machining jig according to an embodiment of the present invention, FIG. 2 is a plan view of a wedge clamp plate taken along the line CC of FIG. 3, and FIG. 3 is a cross-sectional view taken along the central line III-III in FIG. 3B, which is a block diagram showing the configuration of a positioning reference pin device for a flexible machining jig according to an embodiment of the present invention. The flexible machining jig of one embodiment of the present invention is
Positioning reference pin device is 2 points symmetrically around the work W
4 sets of set and clamp device are installed. Although the positioning reference pin device is disclosed in this embodiment, a positioning reference block device for positioning the first to third surfaces of the work W may be used instead. A desired number of positioning reference pin devices or blocking devices and clamping devices may be installed at required positions. Each set of the positioning reference pin device and the clamp device will be described below.

The positioning reference pin device 1set of FIG. 3 is movable in the horizontal front-rear direction (X-axis direction) and the horizontal left-right direction (Z-axis direction), and the X-axis direction is "servo MOT with encoder" + "Precision feed screw" + "Wedge system slide" + "Lock function by wedge system slide":
The Z-axis direction is "servo MOT with encoder" + "precision feed screw" + "linear guide" + "with lock function by hydraulic clamping sleeve". More specifically, a reference pin 1 that can be fitted into a reference hole provided in the work W in advance.
Is connected to a hydraulic cylinder 2 for driving the reference pin 1 in and out by a link 2 ', and is incorporated in the reference pin case 3.
The reference pin case 3 is mounted on the pin support plate 4, and the linear slide 2 that moves in the horizontal Z-axis direction below the pin support plate 4.
Have 5. A support block 5 ′ that supports the pilot rod 5 for locking the displacement after positioning by the hydraulic clamping sleeve 16 is attached to the pin support plate 4. The hydraulic clamping sleeve 16 is supported and fixed on the wedge slide plate 12.

Below the pin support plate 4, a feed screw nut bracket 6 containing a linear slide nut is provided at one location. The Z-axis feed screw 6'is connected to a servomotor 17 with an encoder by a coupling 6 "and attached to a bracket 11 fixed on a wedge slide plate 12 for X-axis movement. The plate 12 has two T-slot guides 1 provided on the base 33.
5, the feed screw nut bracket 13 is attached to the lower side. X-axis precision feed screw 14 '
Is a servomotor with encoder 1 by coupling
4 and is mounted on the base 33. The wedge slide plate 12 is shown in FIG.
2, the wedge slide plate 12 moves in the direction of the arrow X in FIG. 2 while being guided by the cam follower 12 '. By appropriately selecting the angle of the inclined surface 12 ″ of the wedge slide plate 12, the wedge slide plate 12 has a position deviation preventing lock function after positioning.

The clamp device 1set of FIG. 1 is movable in the front-rear direction (X-axis direction) left-right (Z-axis direction) up-down (Y-axis direction): "hydraulic cylinder with position detector" in the X-axis and Z-axis directions. + "Sliding slide" + "With lock function by hydraulic circuit of hydraulic cylinder": Y-axis is "servo M with encoder"
"OT" + "screw jack with reduction gear" + "round guide sliding slide" + "with lock function by hydraulic clamping sleeve". More specifically, there is a clamp metal 22 facing a reference metal 21 that supports a machining load such as cutting / grinding and a clamping force, and the clamp metal 22 is connected to a rod of a clamp cylinder 23 by a link 22 '. The clamp cylinder 23 is mounted on a clamp support plate 24, and the clamp support plate 24 is provided with a speed reducer screw jack 28.
The rod tip and two vertically moving round guides 25 'are connected. The slide plate 29 includes a bracket 26 that supports the reference metal 21, a clamping sleeve 27 that has a slide guide function of a round guide and a function of locking the vertical position,
Also, the clamp support plate 24 fixedly supports the screw jack with reduction gear 28 driven by the servo motor with encoder 28 'for performing vertical movement in the Y-axis direction.

The position can be finely adjusted by a screw jack with a reduction gear 28, and the clamping sleeve 27 accurately locks this set position. The mechanism for moving the clamp support plate 24 in the vertical Y-axis direction may be omitted in several kinds of workpiece processing jigs having substantially similar clamp heights. Slide plate 29
Is connected to the rod of a hydraulic cylinder 30 with a position detector for driving the Z-axis (see the lower dotted line in FIG. 3) via a joint 30 '. The hydraulic cylinder 30 with a position detector has a function of locking the Z axis direction positioning setting position by an appropriate hydraulic circuit (not shown). The guide 31 'of the Z-axis sliding slide is provided on the slide plate 31 in the front-rear direction (X-axis), and the slide plate 31 is connected to the rod of the hydraulic cylinder 32 with a position detector for driving the X-axis through a joint 32'. It is connected. The hydraulic cylinder 32 has a function of locking the set position in the X-axis direction by a hydraulic circuit (not shown). Guide 34 of X-axis slide plate 31
And the hydraulic cylinder 32 for X-axis slide drive has a base 33.
It is fixedly supported on. By using the hydraulic cylinder 32 with a position detector having a lock function in the hydraulic circuit, the jig can be constructed at low cost.

Next, the operation of the flexible machining jig will be described. First, the positioned work W supported by the transport device (not shown) is set on the reference gold 21 at four locations (only two locations are shown in FIG. 1). Work W installed
The reference pin 1 is inserted into the reference holes (2 places) by the hydraulic cylinder 2. Incidentally, the reaction force at the time of insertion shall be received by the transport device. Workpiece W positioned by reference pin 1
Are clamped by the clamps 22 at four places. The upper surface of the work W is processed in the above state. As a step change procedure, as an example of the work W, for example, in the case of different types of cylinder heads, the positioning pin hole position and the clamp position are changed with respect to the work center.
Generally, various dimensions change depending on (single overhead cam), DOHC (double overhead cam), V4 (4 cylinders), V6 (6 cylinders), and the like. In order to deal with the above, the positioning reference pins of the flexible machining jig of one embodiment of the present invention are the X and Z axes, and the clamping device is
The X, Z and Y axes can be moved.

Positioning reference pin device: X-axis movement-By driving the servomotor 14, the feed screw and the wedge slide plate 12 move in the X-axis direction, and position detection is performed by an absolute encoder attached to the servomotor. To move: Z-axis movement-By cutting the hydraulic pressure to the clamping sleeve 16 and driving the servo motor 17 in a movable state, the pin support plate 4 moves in the Z-axis direction via the feed screw, and position detection is performed by the servo. It is performed by the absolute encoder attached to the motor. After moving to the pre-programmed position, hydraulic pressure is applied to the clamping sleeve 16 to lock the position of the pin support plate 4. Clamping device unit: X-axis, Z-axis movement-moving the hydraulic cylinder with position detector to a pre-programmed position moves the clamp metal in the X-axis and Z-axis directions: Y-axis movement-clan With the hydraulic pressure applied to the ping sleeve 27 cut off to allow movement, the screw jack with reduction gear 2
By driving a servo motor attached to the lift plate 8, the lift plate 24 moves up and down via a screw jack. Position detection is performed by an absolute encoder attached to the servo motor. After moving to the pre-programmed position, hydraulic pressure is applied to the clamping sleeve to lock it.

(Preferred Embodiment) The present invention is shown in FIGS.
Although the flexible machining jig of one embodiment shown in FIG. 1 has been described, the present invention has the following preferred embodiments instead. (1) A flexible machining jig having a reference platform for supporting a work, which is supported by a base instead of the reference gold. (2) A flexible machining jig having a clamp device that can be arbitrarily positioned in a two-dimensional horizontal direction and has a locking function to prevent misalignment after positioning. (3) Horizontal direction 2 via a slide slide to a hydraulic cylinder with a lock function by a hydraulic circuit and with a position detector
A flexible machining jig having a positioning reference pin or a block device that is movable in the dimension. With this configuration, the jig can be constructed at low cost.

[0014]

Among the conventional equipment, the jig is said to have the lowest flexibility, but the present invention enables setup change in a short time, making it suitable for dedicated machines, machining centers, and flexible transfer lines (FTL). By installing it, it is possible to provide a flexible machining jig for machining such as cutting / grinding, which can form a machining line more flexible than conventional equipment. In addition, according to the present invention, it is possible to attach workpieces, which are various kinds of workpieces, by easy step change without exchanging jigs or jig parts. Further, according to the present invention, various kinds of workpieces can be attached to jigs or jigs. It was decided to provide a jig system with low initial cost and running cost without having to prepare many jigs without replacing parts. Further, it is intended to provide a flexible machining jig capable of processing various kinds of works with high processing accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a clamp device configuration of a flexible machining jig according to an embodiment of the present invention.

FIG. 2 is a plan view of the wedge clamp plate taken along the line CC of FIG.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1 and is a block diagram showing the configuration of a positioning reference pin device for a flexible machining jig according to an embodiment of the present invention.

[Explanation of symbols]

1. ． Reference pin 4. ． Pin support plate 12. ． Wedge slide plate 14. ． Servo motor with X-axis movement encoder 17. ． Servo motor with encoder for Z-axis movement 21. ． Reference money 22. ． Clamp 24. ． Clamp support plate 28. ． Screw jack with reduction gear 28 '. ． Servo motor with encoder for Y-axis movement 29. ． Slide plate (Z axis) 30. ． 31. Hydraulic cylinder with position detector for Z-axis drive (second hydraulic cylinder) 31. ． Slide plate (X axis) 32. ． Hydraulic cylinder with position detector for X-axis movement (first hydraulic cylinder) 33. ． base

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuto Tatsuda 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (4)

[Claims] 1. A flexible device having a positioning reference pin or a block device and / or a clamping device, each of which can be arbitrarily positioned in a horizontal two-dimensional direction and which has a locking function for preventing displacement after positioning. Machining jig. 2. The clamp device is provided at a position facing the clamp metal of the clamp device, is positionable in any horizontal two-dimensional direction together with the clamp metal, and has a reference metal for sandwiching a work with the clamp metal. The flexible machining jig according to claim 1, wherein the clamp device can be arbitrarily positioned in the vertical direction and has a locking function for preventing misalignment after positioning. 3. The positioning reference pin or the block device has a base, and a servomotor with an encoder fixed on the base is movable in one horizontal direction to a wedge slide having a lock function via a precision feed screw. Wedge slide plate, pin or block support plate on which a servomotor with an encoder fixed on the wedge slide plate is movable in the other horizontal direction via a linear guide, and the pin or block supported on the wedge slide plate and the pin or The flexible machine according to claim 1, further comprising: a first hydraulic clamping sleeve that prevents the block support plate from being displaced after the positioning is set, and a reference pin or block that is movably supported on the pin or block support plate. Processing jig. 4. The first clamp device, which is fixed on the base and has a lock function in a hydraulic circuit, and which has a position detector.
A first slide plate which is movable in one horizontal direction via a sliding slide to the hydraulic cylinder of No. 1, and a first slide plate which is fixed on the first slide plate and has a lock function in a hydraulic circuit and which has a position detector. A second slide plate that is movable in one horizontal direction via a sliding slide to the second hydraulic cylinder, and a clamp cylinder that operates the reference metal and the clamp metal that are respectively fixed on the second slide plate. 3. A screw jack with a speed reducer driven by a servo motor with an encoder that moves a clamp support plate that supports the clamp support plate, and a second hydraulic clamping sleeve that prevents displacement of the clamp support plate after positioning setting. Flexible machining jig.