JPH0621805U - Chuck - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the chattering (micro vibration) of the workpiece gripping claws during workpiece machining and to eliminate the sliding surface of the chuck. [Structure] The cutouts 14, 1 are formed in the flat plate portion 8b of the operating body 8.
Rectangular mounting pieces D, E, F for mounting the work gripping claws, which are surrounded by 6, 18 and the grooves a, b, c, are formed in three directions. The thick outer diameter portion of the actuating body 8 is defined by the silling wall 2
It is fixed to the main body 2 forming c, and the lower side of each attachment piece D, E, F is connected to the piston 6. When the piston 6 is driven, the attachment pieces D, E, F are displaced, and the work gripping claws attached to the attachment pieces D, E, F are opened and closed. The operating body 8 is integrally processed from a single material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chuck used for machining a work by a machine tool.

[0002]

[Prior art]

 Japanese Unexamined Patent Publication (Kokai) No. 2-296513 discloses a work holding jig for machining which opens and closes a chuck by operating a diaphragm by air pressure.

[0003]

[Problems to be solved by the device]

 In the above conventional device, the diaphragm is directly driven by the air pressure, so that the driving position of the diaphragm cannot be set accurately. In addition, since the inner diameter of the diaphragm slides against the work stopper, the sliding parts between the diaphragm and the work stopper may wear due to the cutting chips and fine particles during processing, which causes a problem. Existed. The present invention aims to eliminate the above defects.

[0004]

[Means for solving problems]

 In order to achieve the above object, the present invention comprises a main body 2 which is detachably mounted on a spindle or the like of a machine tool and has a cylinder wall 2c formed in an inner diameter portion thereof, and slidably fitted on the cylinder wall 2c. A rectangular mounting piece D for mounting a work holding claw surrounded by the piston 6, notches 14, 16 and 18 on both sides and the upper and lower grooves a, b and c, each of which is connected to the piston 6 at the lower part. , E, and F are formed in a plurality of directions, and an operating body 8 integrally formed with a thick outer diameter portion 8a fixed to the main body 2 is provided.

[0005]

[Action]

 In the above configuration, the operating body 8 has no sliding surface, and the displacement amounts of the mounting pieces D, E, and F that support the workpiece gripping claws of the operating body 8 are accurately set by the amount of movement of the piston 6 with respect to the cylinder wall 2c. To be done. Further, since the operating body 8 is integrally machined from a single material, little vibration (chattering) occurs during the machining of the work.

[0006]

【Example】

 Hereinafter, the configuration of the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings. Reference numeral 2 denotes a cylinder body detachably attached to an end surface of a spindle of a machine tool, a base 2a having a cylinder wall 2c formed on a cylinder portion, and a plate fixed to an end portion of the cylinder portion of the base 2a. The base cover 2b is shaped like a base. A tube holder 4 is hermetically fitted in the inner diameter portion of the base 2a so as to be slidable in the axial direction. A fluid tube (not shown), which has a triple structure and is connected to a fluid pressure feeding device, is screwed into the tube holder 4. Reference numeral 6 denotes a piston, the outer peripheral surface of which is slidably fitted in the cylinder wall 2c of the base 2a in a sealing manner, and the outer peripheral surface of the tubular portion 6a of the piston 6 is the inner diameter of the base cover 2b. It is slidably fitted in a sealed part.

The flange portion of the tube holder 4 is fixed to the piston 6 with a screw. Reference numeral 8 denotes an actuating body, which is integrally formed with a thick tubular outer diameter portion 8a, a plate-shaped flat plate portion 8b, and a recessed portion 8c. The outer diameter portion 8a is fixed to the base cover 2b by screws 10 and 12, and the inner diameter portion of the bottom wall of the recessed portion 8c is screwed into the small diameter tubular portion 6b of the piston 6. The cross-sectional shape of the recessed portion 8c is formed in a substantially triangular shape. As shown in FIG. 3, in the flat plate portion 8b, the cutout portions 14, 16 and 18 and the groove on the one surface side which is perpendicular to the portions of the cutout portions 14, 16 and 18 which face each other in parallel. Rectangular mounting pieces D 1, E and F surrounded by a and grooves b and c on the other surface side are formed in three directions. Known work gripping claws (not shown) are fixed to the attachment pieces D, E, and F.

The recess 8c is integrally connected to the lower portion of the mounting pieces D, E, F. A cover 22 is fixed to the flat plate portion 8b by a screw 20, and a tubular inner diameter portion of the cover 22 is slidably fitted to a tip of a small diameter tubular portion 6b of the piston 6. Numeral 26 is a spacing pillar fixed to the flat plate portion 8b by a screw 20, and the other one is screwed into a hole of the base cover 2b.

Next, the operation of this embodiment will be described. In FIG. 1, the piston 6 moves to the right on the cylinder wall 2c, the recessed portion 8c of the actuating body 8 interlocking with the piston 6 moves to the right, and the mounting pieces D, E, and F move into the grooves a, b. When tilted to the right with the forming part as the fulcrum, the facing interval of the workpiece gripping claws becomes wider. Further, when the piston 6 moves to the leftward position shown in FIG. 1, the mounting pieces D, E, F of the actuation body 8 return to their original state, and the facing distance between the work gripping claws is narrowed.

The work gripping claw grips the work (not shown) or releases the gripping by expanding or contracting the facing interval of the work gripping claws. When moving the piston 6 to the right in FIG. 1, air is sent from the hole 24 to the left side surface of the piston 6, and the air on the right side surface of the piston 6 is removed. When the piston 6 is moved to the left in FIG. 1, air is sent to the right side of the piston 6 through the hole 30, the ring-shaped space 32, and the hole 28, and the air on the left side of the piston 6 is removed.

[0011]

【effect】

 As described above, in the present invention, since there is no sliding surface on the operating body that supports the workpiece gripping claw, there is no wear or failure caused by cutting chips or fine powder during processing. Also, since there is no sliding surface on the actuator, it is not necessary to lubricate this part. Further, since the operating body is formed by the integrated processing from a single material, there is an effect that the chattering phenomenon during the work processing can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view.

FIG. 2 is a right side view.

FIG. 3 is a right side view of the operating body.

FIG. 4 is a left side view of an operating body.

[Explanation of Codes] 2 Main Body 2a Base 2b Base Cover 4 Tube Holder 6 Piston 8 Actuator 10 Screw 12 Screw 14 Notch 16 Notch 18 Notch 20 Screw 22 Cover 24 Hole 26 Spacing Strut

Claims (1)

[Scope of utility model registration request] 1. A main body 2 which is detachably mounted on a spindle or the like of a machine tool and has a cylinder wall 2c formed in an inner diameter portion thereof.
And a piston 6 slidably fitted in the cylinder wall 2c, surrounded by notches 14, 16 and 18 on both sides and upper and lower grooves a, b and c, and each of the lower parts is the piston 6
A flat plate portion 8b formed with a plurality of rectangular attachment pieces D, E, and F for attaching a work gripping claw to be coupled to the main body 2 and a thick outer diameter portion 8a fixed to the main body 2 are integrally formed. A chuck provided with the formed actuation body 8.