JPH0825112B2 - Work clamp device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work clamp device for fixing a work when machining the work, and in particular, clamping a deformed work having a complicated outer peripheral surface shape. The present invention relates to a workpiece clamping device for performing.

(Prior Art) When cutting or grinding a work, it is necessary to securely fix the work. In many cases, work pieces are fixed using screw members such as bolts, but in order to fix mass-produced products such as automobile parts,
It is necessary to automatically fix these works, and a hydraulic cylinder is often used.

(Problems to be Solved by the Invention) However, when the workpiece to be processed is a so-called irregularly shaped workpiece having a complicated outer surface shape such as an intake manifold or an exhaust manifold which is an engine component, a plurality of clamps is used. When the workpieces are simultaneously fastened by the jigs, there is a problem that the workpieces cannot be locked with a certain accuracy because the timings when the clamp jigs hit the workpieces are different in each part of the workpieces.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to enable highly accurate fastening of a deformed work to a jig body in a predetermined posture.

(Means for Solving the Problems) According to the present invention for achieving the above-mentioned object, an apparatus main body supporting a work is provided with at least one first reference surface formed as a flat surface for mounting the work on the work. At least one second reference provided at a position apart from the first reference surface as a supporting portion when the first positioning member that comes into contact is provided and is clamped to the work. A second positioning member that comes into contact with a surface is provided in the apparatus main body, and the first positioning member is used to fasten the work. A first cylinder that operates a first clamp piece and the second positioning member are fastened to the work. A second cylinder that operates a second clamp piece that is attached to the apparatus body, and after the first clamp piece completes the fastening by the first cylinder, A clamp device for a work, comprising a starting means for driving the second cylinder.

(Operation) In the state where the workpiece is placed on the apparatus body with the reference surface formed on the workpiece being in contact with the positioning member of the apparatus body,
First, by activating the first cylinder, the work is clamped by the first clamp piece. Then, the second cylinder is operated by the operation of the start-up means, and the work is further clamped by the second clamp piece. Therefore, since the first reference surface of the work is surely brought into close contact with the first positioning member of the apparatus main body by the first clamp piece to be fastened, the work is finally fastened by the second clamp piece. Clamping force does not cause floating between the first reference surface as the mounting plane and the first positioning member of the apparatus body, and the close contact state between the first reference surface and the first positioning member is reliably maintained. It As a result, the work is accurately fastened and fixed at a predetermined position of the apparatus body.

(Example) Hereinafter, the present invention will be described in detail based on an illustrated example.

1 to 3 are views showing a work clamp device according to an embodiment of the present invention, in which a lower support plate 10 and an upper support plate are shown.
The device body 12 is formed by 11 and this device body.
The deformed work W is placed on top of the twelve.
This deformed work W shows an exhaust manifold formed into a predetermined shape by casting, and a reference surface S1 as a mounting plane is cut at the two connecting portions W1 to be mounted on a cylinder head (not shown). It is processed. A positioning plate 13 to which the reference surface S1 is fixed when the deformed work W is placed on the apparatus main body 12.
Is fixed to the upper support plate 11 of the apparatus main body 12, and in this state, the other part of the deformed work W is separated from the upper support plate 11 as shown in FIG.

As shown in FIG. 3, in the deformed work W, another reference surface S2 is cut at a portion apart from the upper support plate 11 separately from the reference surface S1 as a support portion for clamping the work. A positioning member 14 that supports the reference surface S2 when the work W is placed on the apparatus main body 12 is attached to the upper support plate 11.

The device main body 12 has one connection part with the positioning plate 13.
A clamp piece 15a for clamping W1 is provided, and a hydraulic cylinder 16a for operating the clamp piece 15a is attached to the apparatus body 12. Further, a clamp piece 15b for clamping the other connecting portion W1 with the positioning plate 13 is provided, and a hydraulic cylinder 16b for operating the clamp piece 15b is attached to the apparatus main body 12.
Further, between the positioning plate 13 and the positioning plate 13, a clamp piece 15c for simultaneously clamping both connection parts W1 and W1 is provided in the device body, and a hydraulic cylinder 16c for driving this clamp piece 15c is attached to the device body. Has been. The two positioning members 13 form a first positioning member, the clamp pieces 15a to 15c form a first clamp piece, and the respective hydraulic cylinders 16a to 16c form a first cylinder.

A clamp piece 17 for fastening the work W with the positioning member 14 is provided in the apparatus body 12, and a hydraulic cylinder 18 for operating the clamp piece 17 is attached to the apparatus body 12. The clamp piece 17 constitutes a second clamp piece, and the hydraulic cylinder 18 constitutes a second cylinder.

A cylinder 20 is further attached to the apparatus main body 12, and the tip end of the clamp rod 21 slidably fitted in the cylinder 20 contacts the concave surface portion S3 of the work W. Oil chamber formed in this cylinder 20
A compression coil spring 23 for urging an elastic force in the direction of advancing the clamp rod 21 is built in the inside of 22,
The clamp rod 21 is moved by the spring 23 to the forward limit position. Then, when the work W is placed on the apparatus main body 12, the clamp rod 21 moves backward due to its own weight against the elastic force of the spring 23.

The cylinder 20 and the cylinder 18 constitute a second cylinder, which includes a clamp piece 17 and a clamp rod 21.
Together form the second clamp piece. The clamp pieces described above are all rotated by 90 ° so that when the work W is placed on the apparatus main body 12, the work W and the clamp pieces do not interfere with each other.

FIG. 4 is a diagram showing a hydraulic circuit for driving the above-mentioned cylinder. The clamp side port 30 is connected to the clamp side ports of the three first cylinders 16a to 16c, and the unclamp side port is connected. Unclamp channel 31
Is connected. In these flow paths 30 and 31, there are fastening positions.
A switching valve 32 that operates between the opening 32a and the open position 32b is connected to either the pump 33 or the tank 34.

The clamp side port of each of the two second cylinders 18 and 20 is connected to a clamp flow channel 40, and the flow channel 40 is connected to the clamp flow channel 30 via an activation start valve 43. This valve 43 has two positions, a first position 43a for setting the respective clamping flow channels 30, 40 to be connected to each other and a second position 43b for setting the clamping flow channel 30 to be returned to the tank. An actuating valve adapted to be actuated to the first position by an actuation rod 44 mounted on the cylinder 16c. The operation to the first position is the time when the clamp piece 15c completes the fastening of the work W by the operation of the cylinder 16c. At this time, it is the time when the clamp pieces 15a, 15b have also been fastened by the other cylinders 16a, 16b.

The unclamping side port of the cylinder 18 is connected to the unclamping channel 32 by the unclamping channel 41. However, since the spring 23 is built in the cylinder 20 as described above, oil is returned to the tank 34 through the clamp flow path 40 during unclamping. In addition, 42 shows a booster.

Therefore, in order to fasten the workpiece to the apparatus main body 12 using the workpiece clamping apparatus of the present invention as shown in the drawing, the reference surface S1 of the workpiece W is brought into contact with the positioning member 13 on the apparatus main body 12, The reference surface S2 is placed so as to be in contact with another positioning member (14). This placement work is automatically performed by a work transfer device (not shown).

Next, the switching valve 32 is set to the engagement position 32a. However, this setting may be done manually,
The valve 32 may be automatically operated as a solenoid valve. Further, each clamp piece is swiveled by, for example, about 90 ° so that the work W and the clamp piece do not interfere with each other when the work W is placed.
After being placed, each clamp piece swivels to
The posture shown in the figure is set. When the switching valve 32 is set to the engagement position, pressure oil is first supplied to the three first cylinders 16a to 16c, and these cylinders start operating. At this time, since the starting valve 43 is in the second position 43b, the other cylinders 18 and 20 do not operate. When the cylinders 16a to 16c are operated, the work W is fastened to the positioning member 13 at the connecting portion W1 by the three clamp pieces 15a to 15c.

When this fastening is completed or almost completed, the operating rod 44
Activates the start valve 43 to switch it to the first position 43a. Then, the pressure oil from the pump 33 flows through the clamp flow path 40.
Flow into the cylinders 18 and 20 through and the other parts of the work W are fastened by the operation of these cylinders.

In this way, a portion where the work W is fastened is provided with a time difference between the first cylinder and the second cylinder, and the work W is reliably connected at its connecting portion W1 to the positioning member 13.
It is fastened to the apparatus main body 12 in a state of being in close contact with the surface of the. Therefore, the work W can be fastened and fixed to the apparatus main body with high accuracy without the phenomenon that this surface floats. In this state, for example, the work W
If a specific portion of is cut, it will be cut by a cutting device (not shown).

It should be noted that the number of the first cylinders is not limited to the above-described embodiment, and the number of the first cylinders may be some other than three. Similarly, the number of the second cylinders is not limited to the illustrated embodiment. .

(Effects of the Invention) As described above, according to the present invention, when fixing a work having a deformed shape in which the entire lower surface is not flat, it is provided in the first and second cylinders having different operating times. The first clamp piece is used to fasten a predetermined portion of the work, and then the second clamp piece is used to fasten another portion of the work using the clamp piece. 1 reference plane is the first of the device body
Since the work is finally fastened by the second clamp piece after being firmly brought into close contact with the positioning member and fastened, the first reference surface as the mounting plane of the work and the first positioning member of the apparatus main body There is no floating due to the clamping operation force during the interval, and the close contact state between the first reference surface and the first positioning member can be reliably maintained. Therefore, the work is accurately fastened and fixed to a predetermined position of the apparatus main body, so that it becomes possible to significantly improve the working accuracy when the work is performed.

[Brief description of drawings]

FIG. 1 is a plan view showing a workpiece clamping device according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG.
FIG. 4 is a hydraulic circuit for controlling the operation of the cylinder according to the present invention. 12 ... Device body, 13 ... Positioning member (first positioning member), 14 ... Positioning member (second positioning member), 15a to 1
5c ... clamp piece (first clamp piece), 17 ... clamp piece (second clamp piece), 21 ... clamp rod (second clamp piece), 43 ... starting valve (starting means), W ... work, S1, S2 ... Reference plane.

Claims (1)

[Claims] 1. A main body for supporting a work is provided with a first positioning member that comes into contact with at least one first reference surface formed on the work as a plane for mounting the work, and clamps the work on the work. A second positioning member, which is provided separately from the first reference surface and is in contact with at least one second reference surface, which is formed separately from the first reference surface, is provided in the apparatus main body as a supporting unit in the case of The first cylinder that operates the first clamp piece that fastens the work by the first positioning member, and the second cylinder that operates the second clamp piece that fastens the work by the second positioning member Attached to the first clamp piece, and the first clamp piece completes the fastening by the first cylinder, and then a starting means for driving the second cylinder is provided. Click of the clamping device.