JPH05343U - Workpiece clamp confirmation device - Google Patents

Abstract

(57) [Summary] [Purpose] A magnet chuck is used to clamp a work piece in a machine tool, and the clamp check of the work piece is performed to easily and surely confirm that the work piece is clamped to this magnet chuck. To provide a device. A clamp device for a workpiece, in which a workpiece W is placed on a magnet chuck 7 and the workpiece W is clamped by excitation of the magnet chuck 7, wherein a fluid passage 21 is provided in the magnet chuck 7. The quality of the clamped state of the workpiece W with respect to the magnet chuck 7 is confirmed by detecting with a pressure switch 51 as a detection device for detecting the pressure of supplying compressed air as fluid to the passage 21. And

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In this invention, a magnet chuck is provided on a work table of a machine tool such as a rotary surface grinder, and a workpiece is placed on the magnet chuck to determine whether the workpiece is clamped by the magnet chuck. This is related to the clamp confirmation device for the workpiece to be confirmed.

[0002]

[Prior Art]

 Conventionally, in order to confirm the quality of the clamped state when a workpiece is clamped on a magnet chuck used for a machine tool such as a grinding machine, the operator can visually check or feel it by touch, or A displacement sensor is attached, and the upper surface of the magnet chuck is moved in parallel to detect it.

Moreover, as an example of confirming the clamped state and rejecting it, foreign matter such as sludge is trapped between the magnet chuck and the workpiece and the workpiece is tilted and clamped, or the clamp position is determined. When positioning is necessary, the positioning jig does not enter the positioning position, and there is a state in which the workpiece is tilted and clamped between the magnet chuck and the workpiece.

[0004]

[Problems to be solved by the device]

 By the way, among the means for confirming whether the clamped state of the workpiece is good or not, when confirming with the former operator's feeling as described above, a machining defect may occur due to an operator's confirmation error, or the workpiece and the blade There is a problem in that the workpiece and the blade may be damaged due to the collision of. Furthermore, this confirmation method cannot be automated or automated.

On the other hand, in the case of confirming with the latter displacement sensor described above, it is necessary to move the displacement sensor with high accuracy in parallel to the upper surface of the workpiece in order to detect the inclination of the workpiece in which a minute foreign substance has entered. In addition, when the inclination is large, it is necessary to avoid the interference between the displacement sensor and the work piece, resulting in a complicated and expensive structure.

In order to solve the above problems, an object of the present invention is to provide a clamp confirmation device for a workpiece, which is inexpensive and has a simple structure and which can confirm the clamped state of the workpiece on the magnet chuck. ..

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a workpiece clamping device for placing a workpiece on a magnet chuck and clamping the workpiece by exciting the magnet chuck. A clamp confirmation device for the workpiece was constructed by providing a detection device that confirms the quality of the clamped state by the fluid pressure of the fluid supplied to this fluid passage.

[0008]

[Action]

 By adopting the workpiece clamp confirmation device of the present invention, the workpiece is clamped by placing the workpiece on the magnet and exciting the magnet chuck. Then, when confirming whether the workpiece is clamped on the magnet chuck, when the fluid is supplied to the fluid passage provided on the magnet chuck, the fluid pressure of the supplied fluid is detected to determine whether the clamped state is good or bad. Is confirmed.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 4, a work table 5, which is vertically movable and rotatable, is placed on the left side of a bed 3 of, for example, a rotary surface grinder 1 in a machine tool. On the work table 5, for example, a magnet chuck 7 for adsorbing an I-shaped workpiece W is placed.

A ram 9 that is movable in the left-right direction in FIG. 4 is provided above the work table 5 on the bed 3 toward the right side. A position sensor 11 such as a linear scale for positioning the ram 9 is provided between the bed 3 and the ram 9.

A disk-shaped wheel 15 supported on a wheel shaft 13 is rotatably attached to the left end of the ram 9 in FIG. The rotation of the wheel shaft 13 is driven by a drive motor 17 provided in the upper right portion of the ram 9.

As the grinding wheel 15 moves toward the center from the outer circumference of the work table 5 due to the movement of the ram 9 in the left-right direction, the work table 5 rotates so that the work table 5 rotates gradually. Therefore, the work table 5 and the ram 9 can be ground regardless of their positions with a constant grinding amount.

As shown in more detail in FIG. 1, a workpiece W is placed on the axial center of the magnet chuck 7 via a disc-shaped adapter rate 19. When the workpiece W needs to be positioned in the center of the magnet chuck 7, a recess WA of the centering spigot is formed on the mounting surface (lower surface) of the workpiece W.

Fluid passages 21 and 23, which serve as a fluid circuit, for example, a compressed air circuit, are formed through the central portions of the magnet chuck 7 and the adapter plate 19. The fluid passages 21 and 23 are connected by an adapter 25, and a boss 27 of a center positioning jig connected to an air pressure circuit, which is a fluid pressure circuit described later, is attached to the upper surface of the fluid passage 23. There is. A hole 29 serving as an outlet for compressed air is formed in the boss 27, and the boss 27 is fitted into a recess WA formed in the mounting surface of the workpiece W.

With the above-described configuration, as shown in FIG. 1, the concave portion WA of the work W is fitted into the boss 27 attached to the central portion of the adapter plate 19, and the magnet chuck 7 is excited to thereby excite the workpiece W. Will be clamped to the magnet chuck 7 via the adapter plate 19.

When confirming the clamped state of the workpiece W, the compressed air is supplied from below the fluid passage 21 formed in the central portion of the magnet chuck 7 as shown by the arrow. is there.

There is no mounting surface WA on the lower surface of the workpiece W, and there is no boss 27 of the center positioning jig on the upper surface of the fluid passage 23 formed in the central portion of the adapter plate 19. The state of clamping at 7 is shown in FIG. Also in FIG. 2, when confirming the clamped state of the workpiece W, the compressed air is supplied from below the fluid passage 21 formed in the central portion of the magnet chuck 7 as shown by the arrow. Is done.

FIG. 3 shows a pneumatic circuit 31 for supplying, for example, compressed air as a fluid to the fluid passage 21 formed in the magnet chuck 7. In FIG. 3, one end of a pipe 33 is connected to the fluid passage 21 and the other end of the pipe 33 is connected to an air pressure source 35. A rotary joint 37, a regulator 39, a speed controller 41, and a direction switching valve 43 are provided in the middle of the pipe 33 from the magnet chuck 7 side. Moreover, the pipe 33 between the rotary joint 37 and the regulator 39 is branched and connected to one ends of the pipes 45 and 47. The tank 49 is connected to the other end of the pipe 45 and the other end of the pipe 47 is connected to the other end. Is connected to a pressure switch 51 as a detection device. Further, an auto drain 53 is provided in the middle of the pipe 45.

With the above configuration, the compressed air from the air source 35 is supplied to the pipe 33, and when the direction switching valve 43 is switched, it is sent to the fluid passage 21 of the magnet chuck 7 via the speed controller 41, the regulator 39, and the rotary joint 37. .. The compressed air sent to the fluid passage 21 flows through the fluid passage 23 and then through the hole 29 formed in the boss 27. If the processed portion W is normally clamped by the magnet chuck 7, the compressed air flowing from the hole 29 may be in a normally clamped state because the pressure of the compressed air rises and the pressure switch 51 outputs a signal. It can be detected and it can be confirmed that the clamp state is normal.

When a foreign matter is present between the workpiece W and the magnet chuck 7, or when the workpiece W is tilted due to a positioning jig or the like and the clamp is not in a normal clamped state, that is, the magnet. When there is a gap between the chuck 7 and the workpiece W, the compressed air injected from the hole 29 formed in the boss portion 27 escapes to the outside, so the pressure of the compressed air does not rise and the pressure switch Since 51 does not work, it is possible to confirm that the clamp state is abnormal by detecting the abnormal clamp state.

As a means for confirming whether or not the pressure switch 51 has detected, for example, a lamp is provided on the pressure switch 51 so that the lamp lights up when the pressure of the compressed air rises. If the lamp lights up, it can be confirmed that the clamped state is normal, and if the lamp does not light up, the clamped state is abnormal. Also, the reverse order may be used, and other confirmation means may be used instead of the lamp.

Therefore, by forming the fluid passage 21 in the magnet chuck 7 and providing the pressure switch 51 as a detection device for detecting the pressure of the compressed air as the fluid flowing in the fluid passage 21, the workpiece W It is possible to easily and surely confirm the quality of the clamped state of. Moreover, the detection device can be a detection device having a low cost and a simple structure, such as a pressure switch, instead of the conventional displacement sensor. Therefore, the problem caused by the worker's mistake can be eliminated, and the man-hour of the worker can be reduced. Moreover, it is also possible to automate the confirmation of the clamped state of the work piece without the need of an operator.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. In this embodiment, the magnet chuck 7 provided on the work table 5 of the rotary surface grinder 1 has been described, but a clamp device for clamping a workpiece with a magnet used in other machine tools can also be applied.

[0025]

[Effect of the device]

 As can be understood from the above description of the embodiments, according to the present invention, since the configuration is as described in the scope of claims for utility model registration, the conventional operator confirmation and the displacement sensor are used. It is possible to easily and surely check the clamped state of the workpiece without using confirmation by using a detection device that is inexpensive and has a simple structure. As a result, the confirmation of the clamped state of the workpiece can be handled automatically and automatically.

[Brief description of drawings]

FIG. 1 is an enlarged detailed view of a main part of the present invention, which is an arrow view part in FIG.

FIG. 2 is an explanatory diagram of another embodiment replacing FIG.

FIG. 3 is an example of a pneumatic circuit for detecting a clamped state of a workpiece.

FIG. 4 is a schematic front view showing a rotary surface grinding machine according to an embodiment of the present invention.

[Explanation of symbols]

 1 rotary surface grinder 5 work table 7 magnet chuck 19 adapter plate 21, 23 fluid passage 27 boss 29 hole 37 rotary joint 51 pressure switch (detection device)

Claims (1)

[Claims for utility model registration] Claims: 1. A workpiece clamping device for placing a workpiece on a magnet chuck and clamping the workpiece by exciting the magnet chuck. The magnet chuck is provided with a fluid passage. A clamp confirmation device for a workpiece, comprising a detection device for confirming the quality of a clamped state by a fluid pressure of a fluid supplied to the fluid passage.