JPH012804A - Machining tool mounting device on tool spindle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a processing tool mounting device on a tool spindle of a machine tool.

[Prior Art] In a conventional machine tool 1, for example, a machining tool mounting device for a tool spindle of a machine tool that performs automatic tool exchange, the attachment/detachment drive device is provided at the rear end of the tool spindle.

[Problems to be solved by the invention] In the conventional tool spindle machining tool mounting device,
If the main shaft drive is a belt drive, please use 1 when replacing the belt.
It is necessary to remove the detachable drive device.

Belt replacement and maintenance is troublesome. Furthermore, the coaxial feed screw must be attached to the rear of the attachment/detachment drive device, which inconveniently increases the size of the machine tool.

[Means for solving the problems] The processing tool mounting device on the tool spindle according to the present invention has the following features:
It is rotatably supported by the spindle head, and has a hollow hole in the axial direction and a slot in the axial direction that opens outward from the hollow hole.
A tool spindle with a tool attachment socket formed at its tip = a tension rod that is inserted into the hollow hole so as to be displaceable in the axial direction and has a tool holder and a tool push-out member at its tip; integrated with the tension rod through the slotted hole The first part fitted on the outer periphery of the tool spindle
a compression spring member sandwiched between the spring holding member and a second spring holding member attached to the outer periphery of the tool spindle and disposed in a distal direction from the first spring holding member; and The cylindrical actuator is fitted around the outer periphery of the compression spring member and operates in the axial direction to press or release the first spring holding member against the compression spring member. .

[Function] The cylindrical actuator releases the first spring holder, and the tension rod is pulled by the compression spring member via the first spring holder, and the tool holder at its tip grips the processing tool. Pull the processing tool into the socket at the tip of the tool spindle,
The machining tool is attached to the tool spindle.

When removing the mounted machining tool from the tool spindle, the cylindrical actuator is actuated to push out the tension rod in the distal direction via the first spring holding member against the compression spring member. Then, the tool holder releases the machining tool and pushes it out of the socket with the tip of the pull rod, so that the machining tool is removed from the tool spindle.

When attaching the machining tool to the tool spindle, the machining tool is inserted into the socket of the tool spindle, and the cylindrical actuator is operated in the direction of releasing the first spring holder. Then, the tension rod is pulled by the compression spring member via the first spring holding member, and the tool holder at the tip grips the machining tool and pulls the machining tool into the socket at the tip of the tool spindle, and the machining tool is Attached to the tool spindle.

[Example] Embodiments of the invention will be described with reference to the drawings.

The illustrated embodiment shows an example in which the present invention is applied to a tool spindle of a machine tool, particularly a machine tool that performs automatic tool exchange.

The spindle head 1 slides vertically on a guide surface (not shown) of the column 2, and is driven by a servo motor 3 for feeding the spindle head. That is, the nut member 5 attached to a portion of the spindle head body 4 that is slidably attached to the guide surface is connected to the servo motor 3 attached to the column 2.
It is threadedly engaged with a feed screw 6 connected to the drive shaft of.

A mounting sleeve 7 is fixed to the main shaft hole in the axial direction at the bottom of the main shaft head body 4.
It is sandwiched with some vertical movement gap between the 1-side weir attached ring body 8 and the lower side mounting ring body 9 which are respectively fixed to the upper and lower end surfaces of the
The upper cylinder and the lower cylinder are integrated, and a sleeve-shaped cylinder 11 having an inward flange [0] formed at the lower end is fitted, and the cylinder 11 is interposed between the upper end and the upper mounting ring 8. It is pressed toward the lower mounting ring body 9 by a compression spring 12 .

A sleeve-shaped piston 13 is fitted into the cylinder 11, and the upper end of the sleeve-shaped piston 13 has an inward flange! 4 is formed □.

A hollow tool main shaft 15 fitted into the sleeve-shaped piston 13 with a gap is rotatably attached to the upper mounting ring 8 and the lower mounting ring 9 via bearings 16 and 17.
A pulley 18 is fixed to the upper end protruding from the upper mounting ring 8, and a hollow hole 19 is provided at the lower end to accommodate the cutting tool T.
It is formed as a socket 20 into which the shank is inserted.

A tension rod 21 is fitted into the hollow hole 19 of the tool spindle 15, and a holder 2:) holding a plurality of steel balls 22 freely movable in the radial direction and a push bolt 2 are attached to the lower end of the tension rod 421.
Similarly, at the upper end of 4, a protruding engagement member 26 is fixed inside the body, and protrudes from a slot 25 diametrically drilled in the tool spindle 15 and communicated with the hollow hole 19 into the gap in the piston 13. .

An annular disc spring retainer 27 is fixed to the protruding engagement member 26 in the gap within the piston 13 .
A disc spring nut 2 screwed onto the surface and the outer peripheral surface of the tool spindle 15
A laminated disc spring 29 is fitted between the top surface of the disc spring holder 27 and the bottom surface of the inward flange 14 of the piston 13 , and the bottom surface of the disc spring nut 28 is connected to the bottom surface of the cylinder 11 . The upper surfaces of the inward flanges IO can be engaged with each other.

A belt 32 is wound around a drive shaft pulley 31 of a spindle drive motor 30 attached to the intermediate portion of the spindle head body 4 and a pulley 18 of the tool spindle.

The relationship among the cylinder 11, piston 13, disc spring retainer 27, disc spring nut 28, and disc spring 29 will be explained with reference to FIGS. 2 and 3.

A pipe line from a hydraulic control device (not shown) outside the spindle head body 4 is connected to oil passages A and B of the spindle head body 4 and the mounting sleeve 7, and the oil passages A and B are connected to each other by the hydraulic control device. A feeding/wandering switch is now performed. The oil passages A and B and the oil passages C and D of the cylinder 11 are in corresponding communication with each other regardless of some vertical movement of the cylinder 11, and the oil passage C is connected to the piston-upper chamber E, and the oil passage is connected to the piston-upper chamber E. They communicate with the piston lower chamber F, respectively.

The operation of the above tool spindle cutting tool mounting device will be described.

FIG. 1 shows a state in which a cutting tool T is attached.

The pulley 31 is driven by the main shaft drive motor 30. The tool spindle 15 is rotationally driven via the belt 32 and the boot 8.

Then, the pull stud P is gripped by the steel ball 22 of the tension rod 21 pulled up inside the tool spindle 15 by the disc spring 29, and the cutting tool T whose shank is fitted in the socket is rotationally driven, and the other The spindle head main body 4, to which a nut member 5 which is screwed into a feed screw 6 rotationally driven by a servo motor 3 is fixed, is fed along the guide surface of the column and subjected to cutting.

When the cutting tool T is removed from the tool spindle 15 which has returned to the predetermined position and has stopped rotating, oil passages A-C are connected to the piston upper chamber E.
At the same time, oil is supplied through the piston lower chamber F to the oil passage B-
Drain the oil through D. Then, the piston 13 is pushed down, and the lower surface of the inward flange 14 touches the disc spring retainer 2.
7 and the cylinder 11 also has a compression spring 12
The upper surface of the inward flange lO contacts the lower surface of the disc spring nut 28, and the cylinder 11
The lower end of the inward flange IO, that is, the lower surface of the inward flange IO is separated from the upper surface of the lower mounting ring 9. Thus, the disc spring 29 is attached to the piston 13 via the disc spring presser 27 and the disc spring nut 28.
When the piston 13 further descends, the disc spring 29 supported by the inward flange 10 via the disc spring nut 28 is held by the disc spring retainer 27. is compressed. This means that the tool spindle 15, which is supported by the inward flange lO of the cylinder 11 via the disk spring nut 28, is pulled by the inward flange 14 of the piston 13 via the disk spring retainer 27 and the protruding engagement member 2G. The rod 21 is pushed downward. Then, the pull stud of cutting tool T.

The shank of the cutting tool T is released from the grip of the steel ball 22 of the holder 23 and pushed by the tip of the push bolt 24, and the shank of the cutting tool T is
The cutting tool T is pushed out from the socket 19 and the tool spindle 1
It is removed from 5. Ultimately, the pressing force by the piston 13 is caused by the cylinder 11 (inward flange 10), which is maintained apart from the lower mounting ring 9 by the hydraulic pressure to the piston upper chamber E, causing a countersunk above the bearing of the tool spindle 15. Since it is supported via the spring nut 28, it does not reach the bearing of the tool spindle 15, let alone the lower mounting ring 9.

To attach the cutting tool T to the tool spindle 15, put the tool spindle 15 in the cutting tool removed state as described above, insert the shank of the cutting tool T into the socket 19, change the oil path, and connect the oil path B to the piston lower chamber F. -D, and at the same time oil is drained from the piston upper chamber E through oil passage A-C. Then,
The piston 13 is pushed up and its inward flange 14
As the lower surface separates from the upper surface of the disc spring retainer 27, the cylinder 11 is also pushed down by the expansion of the compression spring 12, and the upper surface of its inward flange lO separates from the lower surface of the disc spring nut 28, and the lower end of the cylinder 11, that is, the inward The lower surface of the flange IO contacts the L surface of the lower mounting ring 9. Thus,
The disc spring 29 expands as the compressive force through the single disc spring retainer 27 and the crooked spring nut 28 disappears, and is thereby pulled against the tool spindle 15 through the single disc spring retainer 27 and the protruding engagement member 26. The rod 21 is pulled upward.

Then, the pull stud of the cutting tool T is gripped by the steel ball 22 of the holder 23, the shank is pulled into the socket 19, and the cutting tool T is attached to the tool spindle 15.

[Effect of the invention] The present invention provides a cutting tool mounting device for a tool spindle.

The attachment/detachment drive device is built around the area between the bearings at both ends of the tool spindle, so it can be attached to the rear end of the tool spindle.

It saves space, makes it easy to attach and detach the belt, and is convenient for belt replacement and maintenance.In addition, the cutting tool mounting device of the machining spindle is not interposed between the feed screw and the tool spindle, which are coaxial. This has the advantage that the feed screw can be inserted into the hollow hole of the tool spindle, and the height of the machine tool can be reduced accordingly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a cutting tool mounting device for a tool spindle in an embodiment of the present invention. FIG. 2 is an enlarged partial view of FIG. 1. FIG. 3 is an enlarged partial view of FIG. 1 showing a state when the cutting tool is removed. l: Spindle head 2: Column 3: Servo motor 4: Spindle head body 5: Nut member 6: Feed screw 7: Mounting sleeve 8: Upper mounting ring 9: Lower mounting ring 10, 14: Inward flange 11 Niji cylinder 12: Compression spring 13: Piston 1
5: Tool spindle 16.17: Bearing 1B, 31
: Pulley 19: Hollow hole 20: Socket 2
1: Tension rod 22: Steel ball 23: Holder 24: Push bolt 25: Slot 26: Projecting engagement member 27: f [lL spring holder 28: @Spring nut 29: Belleville spring
30: Main shaft drive motor 32: Belt

Claims (1)

[Claims] It is rotatably supported by the spindle head, and has a hollow hole in the axial direction and a slot in the axial direction that opens outward from the hollow hole.
A tool main shaft having a tool mounting socket formed at its tip; a pull rod inserted into the hollow hole so as to be displaceable in the axial direction, and having a tool holder and a tool pushing member at its tip; integrated with the pull rod through the slotted hole; The first part fitted on the outer periphery of the tool spindle
a compression spring member sandwiched between the spring holding member and a second spring holding member attached to the outer periphery of the tool spindle at a distance from the first spring holding member in the distal direction; and A tool comprising a cylindrical actuator that is fitted around the outer periphery of the compression spring member and operates in the axial direction to press or release the first spring holding member against the compression spring member. Machining tool mounting device on the spindle