JPH0650711U - Tool chuck - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a chuck for a tool having a structure that is sufficiently resistant to vibration and impact due to lateral force applied to the tool. [Constitution] A chuck for a tool, characterized in that an outer peripheral surface of a fixed side screw body 5 and an inner peripheral surface of a base end portion of a rotation guide tube 9 are closely fitted so as to be relatively rotatable.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chuck for tools.

[0002]

[Prior art]

 As this type of tool chuck, the one described in Japanese Utility Model Publication No. 59-20889 is known. This conventional one has a base end fixed cylinder having a fitting insertion part that is removably fitted in the equipment spindle and having openings on both sides in the axial direction, and a fixed side provided on the base end fixing cylinder. The chuck claw is screwed into the screw body and the fixed side screw body so as to be able to advance and retreat in the axial direction, and has a chuck claw that can be expanded and contracted in the radial direction on the front end side, and the chuck claw can be moved by moving in the axial direction. And an elevating screw shaft that expands and contracts in the radial direction, and is externally fitted to the fixed-side screw body so as to be rotatable and immovable in the axial direction, and is used for rotating operation of the elevating screw shaft. And a rotation guide tube that guides the chuck claws on the inner peripheral surface.

[0003]

[Problems to be solved by the device]

 The above-mentioned conventional type supports the cutting resistance force of the tool gripped by the chuck claw with a combined body consisting of a base end fixed tube, a fixed side screw body, a rotation guide tube, etc. The structure was not sufficiently resistant to vibration and shock due to force. That is, in the above-mentioned conventional type, the end faces of the base end fixed cylinder and the rotation guide cylinder face each other with a small gap, and the two are in sliding contact with each other only to cause a slight friction, so that they sufficiently resist shaft runout. I couldn't.

Therefore, the present invention aims to provide a tool chuck that solves the above problems.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention takes the following measures. That is, a feature of the present invention is that a base end fixing cylinder having a fitting portion that is removably fitted in the equipment spindle and having openings on both sides in the axial direction, and the base end fixing cylinder. The fixed side screw body is screwed into the fixed side screw body so as to advance and retreat in the axial direction, and has a chuck pawl that can be expanded and contracted in the radial direction on the tip end side. An elevating screw shaft that expands and contracts the chuck claws in the radial direction by movement, and a fixed screw body that is rotatably and immovably mounted on the fixed screw body so as to rotate the elevating screw shaft. In addition, in the tool chuck having a rotation guide tube that guides the chuck claw on the inner peripheral surface, the fixed side screw body is formed separately from the base end fixed tube, and The outer peripheral surface of the base part of the side screw body is tapered so that the diameter becomes smaller toward the base end. And forming the tip end side of the inner peripheral surface of the base end fixed cylinder into a taper portion to which the taper portion of the fixed side screw body is taper coupled, and the taper on the inner peripheral surface of the base end fixed cylinder. A bolt receiving portion is formed on the base side of the fixed portion, and the bolt receiving portion is inserted into the base side opening of the base end fixing cylinder so as to be rotatable from the base side opening and the fixing screw body. A fixing bolt that is screwed onto the fixed-side screw body and pulls the fixed-side screw body is rotatably inserted and held, and the outer peripheral surface of the fixed-side screw body and the inner peripheral surface of the base end portion of the rotation guide tube are opposed to each other. The point is that they are closely fitted to each other during rotation.

[0006]

[Action]

 According to the present invention, since the outer peripheral surface of the fixed side screw body and the inner peripheral surface of the base end portion of the rotation guide tube are closely fitted to each other so as to be rotatable relative to each other, the close contact portion acts on the tool. It is possible to receive the processing stress and vibration that occur, and to reduce vibration and impact.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a spindle provided in a machine tool, and a fitting hole 2 which is a large-diameter taper hole is formed in a downward opening in the spindle 1. The tool chuck 3 detachably attached to the spindle 1 includes a base end fixing cylinder 4, a fixed side screw body 5, a fixing bolt 6, and a lifting screw shaft 8 including a chuck claw 7, and a rotation guide cylinder 9. It is mainly composed of etc.

The base end fixed cylinder 4 is hollow and opens on both sides in the axial direction, and has a base side opening 10 and a tip side opening 11 (hereinafter referred to as “base side” or “base side”). Refers to the upper side of the drawing, and "tip side" refers to the lower side of the drawing). The outer peripheral surface of the fitting portion 12 has a taper shape whose diameter becomes smaller toward the base end, is detachably fitted in the fitting hole 2 of the spindle 1, and is fixed to the spindle 1 by a draw bar (not shown). It In the base end fixed cylinder 4, the draw bar mounting portion 15 into which the draw bar is inserted and screwed, the bolt receiving portion 16, the taper portion 17, and the large-diameter fitting portion 18 are arranged in this order from the base end to the tip. They are connected in the axial direction. The bolt receiving portion 16 has a diameter smaller than that of the drawbar charging portion 15 and the taper portion 17, and the taper portion 17 has a taper shape having a diameter smaller toward the base end.

The fixed-side screw body 5 is formed into a tubular shape that is open on both sides in the axial direction, and the outer peripheral surface of the base portion has a taper portion 19 that has a taper shape whose diameter decreases toward the base end. The taper portion 19 is detachably taper-coupled to the taper portion 17 of the base end fixing cylinder 4 and projects downward from the base end fixing cylinder 4. On the inner peripheral surfaces of the base side and the tip side of the fixed side screw body 5, screw parts 20 and 21 are engraved, respectively, and the fixed side screw body 5 projects downward from the base end fixed barrel 4. A ring-shaped guide portion 22 that projects outward in the radial direction is integrally formed in this portion.

The fixing bolt 6 is removably inserted into the bolt receiving portion 16 from the base side opening 10 of the base end fixing cylinder 4 and is rotatably held by its head 6a. The base side opening 10 is pivotally operable and is detachably connected to the base side screw portion 20 of the fixed side screw body 5 so as to pull the fixed side screw body 5 and to pull the fixed side screw body 5. -The taper portion 19 is releasably taper-joined to the taper portion 17 of the base end fixed cylinder 4.

The lifting screw shaft 8 is inserted into a screw part 21 on the tip side of the fixed side screw body 5 so as to be movable back and forth in the axial direction, and a chuck for releasably fixing a tool to the tip part side. The claws 7 are provided so as to be expandable and contractible in the radial direction, and the chuck claws 7 are expanded and contracted in the radial direction by the movement of the lifting screw shaft 8 in the axial direction. The rotation guide tube 9 is rotatably fitted over the base of the fixed-side screw body 5, and is constituted by connecting a main body 23, a holding member 24, and a fixed nut 25 in the axial direction. Has been. The main body 23 is located on the tip end side of the rotation guide tube 9, and a holding member 24 is detachably screwed or fixed to the base of the main body 23. The tip end of the holding member 24 is rotatably fitted to the tip end side of the fixed side screw body 5, and the base side thereof protrudes above the guide portion 22 of the fixed side screw body 5. A large number of guide balls 26, which are located between the outer peripheral surface of the fixed screw body 5 and the inner peripheral surface of the sandwiching member 24, are rollably arranged on the guide portion 22 in the circumferential direction. The fixed nut 25 is screwed into the base end portion of the holding member 24 and externally fitted so as to be rotatably slidably contacted with the fixed side screw body 5, and by the holding member 24 and the fixed nut 25, By sandwiching the guide portion 22 and the guide ball 26 in the axial direction, the rotation guide cylinder 9 is prevented from moving in the axial direction with respect to the fixed screw body 5. Further, the main body 23 is movably engaged with the elevating screw shaft 8 only in the axial direction, and the elevating screw shaft 8 is rotatably operated by the rotation of the rotation guide tube 9. The chuck claw 7 is guided by the inner peripheral surface of the tip end side of 23. A plurality of tool engagement recesses 27 are circumferentially arranged on the outer peripheral surface of the main body 23.

According to the embodiment having the above-mentioned configuration, when assembling the tool chuck 3, the lifting screw shaft 8 having the chuck claw 7 and the rotation guide tube 9 are assembled to the fixed screw body 5. Make up a unit. Then, the unit body is inserted from the front end opening 11 of the base end fixing cylinder 4, and the fixing bolt 6 is inserted from the base side opening 10 of the base end fixing cylinder 4 into the bolt receiving portion 16 to open the base side opening. By rotating the fixing bolt 6 from 10, the fixing bolt 6 is screwed to the base side screw portion 20 of the fixed side screw body 5, and the fixed side screw body 5 is pulled up, so that the taper portion 19 is fixed. The taper is joined to the taper portion 17 of the end fixing cylinder 4, and thus the tool chuck 3 can be easily assembled.

During assembly of the tool chuck 3, only the holding member 24 of the rotation guide tube 9 and the fixing nut 25 are assembled to the fixed side screw body 5, and the fixed side screw body 5 is fixed to the base end fixed tube 4. After mounting on the fixed side screw body 5, the lifting screw shaft 8 provided with the chuck claw 7 and the main body 23 of the rotation guide tube 9 may be assembled. Further, in the embodiment, the fixed nut 25 of the rotation guide tube 9 is screwed into the proximal end portion of the holding member 24 and externally fitted so as to be rotatably slidably contacted with the fixed screw body 5. The processing stress and vibration acting on the tool can be more reliably received.

[0014]

[Effect of device]

 According to the present invention, since the outer peripheral surface of the fixed side screw body and the inner peripheral surface of the base end portion of the rotation guide tube are closely fitted to each other so as to be rotatable relative to each other, the close contact portion acts on the tool. It is possible to receive the processing stress and vibration that occur, and to reduce vibration and impact.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a first embodiment of the present invention.

[Explanation of symbols]

 1 Equipment spindle 4 Base end fixed cylinder 5 Fixed side screw body 6 Fixing bolt 7 Chuck claw 8 Lifting screw shaft 9 Rotation guide cylinder 10 Opening 11 Opening 12 Fitting part 16 Bolt receiving part 17 Taper part 19 Taper part

Claims (1)

[Scope of utility model registration request] 1. A base end fixed cylinder (4) having a fitting part (12) which is removably fitted in the equipment spindle (1) and having openings (10, 11) on both sides in the axial direction, and the base end fixed cylinder (4). A fixed side screw body 5 and a fixed side screw body 5 that is screwed into the fixed side screw body 5 so as to be able to move forward and backward in the axial direction, and has a chuck claw 7 that can be expanded and contracted in the radial direction on the tip side. By moving in the direction
An elevating screw shaft 8 that expands and contracts 7 in a radial direction, and a fixed side screw body 5 are rotatably and immovably mounted on the fixed screw body 5 so as to rotate the elevating screw shaft 8. In both, a tool chuck having a rotation guide tube 9 for guiding the chuck claw 7 on the inner peripheral surface, the fixed side screw body 5 is formed separately from the base end fixed tube 4, and The outer peripheral surface of the base portion of the fixed screw body 5 has a taper portion 19 having a taper shape whose diameter becomes smaller toward the base end.
The inner peripheral surface of the base end fixed barrel 4 is formed at the tip end side with a taper portion 17 to which the taper portion 19 of the fixed side screw body 5 is taper-joined, A bolt receiving portion 16 is formed on the circumferential surface on the base side of the taper portion 17, and the bolt receiving portion 16 is inserted from the base side opening 10 of the base end fixing cylinder 4 and rotated from the base side opening 10. A fixing bolt 6 that can be operated and is screwed to the fixed screw body 5 to draw the fixed side screw body 5 is rotatably inserted and held, and the outer peripheral surface of the fixed side screw body 5 and the rotation guide tube. A chuck for a tool, which is closely fitted to the inner peripheral surface of the base end portion of 9 so as to be relatively rotatable.