JPH1015715A - Tool mounting device for turning center - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool mounting device which prevents cutting resistance force from acting to a bearing at time of cutting, in the tool mounting device for a turning enter exchanging to use a rotary tool and a turning tool. SOLUTION: A holding cylinder 5 is additionally mounted in a lower end surface of a ram 4, in this holding cylinder 5, a clamp cylinder unit 6, surrounded an external peripheral surface by an internal peripheral surface envelop a peripheral surface of a spindle 2 to form an external peripheral surface in a shape tapered downward, is provided, this clamp cylinder unit 6 is cut from the center along an axial line in a radial line shape, to be formed in at least three sector block shapes. Between this clamp cylinder unit 6 and an internal peripheral surface of the holding cylinder 5, a tapered cylinder unit 7, engaging an internal peripheral surface in a tapered shape, is provided to be interposed slidably in an axial direction, a moving mechanism 8 is provided, which fixes in a radial direction the spindle 2 in the clamp cylinder unit 6 by operating the tapered cylinder unit 7 when a turning tool (b) is used in the holding cylinder 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning center tool mounting device which is effective when a rotary tool and a turning tool are appropriately replaced and mounted.

[0002]

2. Description of the Related Art A rotary tool is attached to a main shaft of a turning center to perform drilling and tapping on a workpiece, or a turning tool is attached to a workpiece for turning. In general, a much larger cutting force is required in turning in comparison with drilling and tapping.

[0003] In particular, when a workpiece is cut from a black scale, cutting resistance is generated with intermittent impact, and the cutting resistance is directly applied to the bearing via the main shaft, thereby deteriorating the accuracy of the bearing. Sometimes there was a drawback that caused damage to the bearing.

In order to solve this problem, the inventors have developed a clamping means using a tapered body for fixing a spindle in a radial direction when a turning tool is used first. Filed a tool mounting device.

[0005] The inventors proceeded with further research after that, compared with the prior application in which a clamp cylinder is fitted into a tapered cylinder and the main shaft is firmly fixed in the radial direction by utilizing the wedge action of the tapered contact surfaces of the two. The present invention has been completed with a much simpler structure.

[0006]

The gist of the present invention will be described with reference to the accompanying drawings.

In a tool mounting device of a turning center for exchanging a rotary tool a and a turning tool b, a main shaft 2 for holding a taper shank 1 of a tool is provided rotatably with respect to a ram 4 via a bearing 3. A holding cylinder 5 is attached to the lower end surface of the ram 4, and an inner peripheral surface of the holding cylinder 5 is
The outer peripheral surface is provided with a tapered clamp cylinder 6 which tapers downward at the outer peripheral surface, and this clamp cylinder 6 is cut radially from the center along the axis to form at least three fan-shaped block shapes. , The clamp cylinder 6 and the holding cylinder 5
A tapered cylinder 7 whose inner peripheral surface is engaged with the tapered taper shape is interposed between the inner peripheral surfaces so as to be slidable in the axial direction. When the turning tool b is used for the holding cylinder 5, the tapered cylinder 7 is operated. In addition, the present invention relates to a tool mounting device for a turning center, wherein a moving mechanism 8 for fixing the main shaft 2 in the radial direction by the clamp cylinder 6 is provided.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings, which are examples of embodiments, showing the functions and effects.

The tapered shank 1 of the rotary tool a is fitted into the tapered hole 2 ′ of the main shaft 2, the moving mechanism 8 is released, and the main shaft 2 is rotated via the bearing 3 by a conventional method, and the work is rotated by the rotary tool a. Drill w and tap.

When performing turning, a rotary tool a is withdrawn from the main spindle 2, a taper shank 1 of the turning tool b is inserted into a tapered hole 2 ′ of the main spindle 2, and a taper cylinder 7 is axially moved by a moving mechanism 8. When the sliding is performed, the main shaft 2 is firmly fixed to the holding cylinder 5 by the wedge action of the tapered surface of the tapered cylindrical body 7 and the tapered surface of the clamp cylindrical body 6, so that the main shaft 2 is fixed in the radial direction, and the cutting resistance is reduced. Turning of the workpiece w can be performed without directly applying to the bearing 3.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a turning center according to a preferred embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view of a main part of the tool mounting device, and FIG.
It is a longitudinal cross-sectional view of the principal part of the tool mounting apparatus equipped with.

In a tool mounting device of a turning center for exchanging a rotary tool a and a turning tool b, a main shaft 2 for holding a taper shank 1 of a tool is provided rotatably with respect to a ram 4 via a bearing 3. A holding cylinder 5 is attached to the lower end surface of the ram 4, and an inner peripheral surface of the holding cylinder 5 is
The outer peripheral surface is provided with a tapered clamp cylinder 6 which tapers downward at the outer peripheral surface, and this clamp cylinder 6 is cut radially from the center along the axis to form at least three fan-shaped block shapes. , The clamp cylinder 6 and the holding cylinder 5
A tapered cylinder 7 whose inner peripheral surface is engaged with the tapered taper shape is interposed between the inner peripheral surfaces so as to be slidable in the axial direction. When the turning tool b is used for the holding cylinder 5, the tapered cylinder 7 is operated. Then, a moving mechanism 8 for fixing the main shaft 2 in the radial direction by the clamp cylinder 6 is provided.

[0013] The lower end surface of the angular ram 4 which is guided by the tool rest 51 and moves up and down is seated, a bearing holder 11 for fastening the bearing 3 is fitted into the seated portion, and the bearing holder 11 is fastened with fastening bolts. Secured to ram 4 and bearing holder
The fitting projection of the holding cylinder 5 is fitted into the counterbore surface of the ram 4 on the lower surface of the 11 and the holding cylinder 5 is fastened to the lower end face of the ram 4 with fastening bolts.

An upper sliding hole 13 is drilled in the holding cylinder 5, and a lower end of the upper sliding hole 13 is inserted through an upper step 13 ′.
A lower sliding hole 14 having a smaller diameter is provided, and a cylindrical portion 15 surrounding a lower peripheral portion of the lower end of the main shaft 2 via a lower step portion 14 'at a lower end of the lower sliding hole 14 with a small gap therebetween. Provide. In the holding cylinder 5, a tapered clamp cylinder 6 whose inner peripheral surface surrounds the outer peripheral surface of the main shaft 2 and whose outer peripheral surface gradually tapers downward is provided. The clamp cylinder 6 is radiated from the center of the cylinder 6. Cut along the axis to form at least three (four in the example) fan-shaped block shapes.
Of the divided block pieces 6 ₁ , 6 ₂ , 6 ₃ , 6 ₄ , are respectively provided with locking holes 16, 16 ′ facing each other so as to face each other, and between the respective facing locking holes 16, 16 ′. block pieces 6 of each of both end portions fitted to the clamp cylinder 6 repression spring 17 to ₁ ·
In a normal state, 6 ₂ 6 ₃ 6 ₄ is urged from the center of the clamp cylinder 6 in the centrifugal direction.

A tapered cylinder 7 whose inner peripheral surface is engaged with the tapered outer peripheral surface of the clamp cylinder 6 is axially slid between the outer peripheral surface of the clamp cylinder 6 and the inner peripheral surface of the holding cylinder 5. Intervenes as possible. In the illustrated embodiment, the outer peripheral portion of the tapered cylindrical body 7 is slidably engaged with the upper sliding hole 13 of the holding cylinder 5 through the large sliding diameter portion 19 and the stepped portion 19 '. It is formed by a small sliding diameter portion 20 that slides into engagement with the hole 14.

Reference numerals 21 and 22 denote O-rings.

The moving mechanism 8 will be described.

A plurality of mounting holes 23 are formed concentrically on the lower end surface of the holding cylinder 5, and a stepped portion is provided in the mounting holes 23 so that
A smaller-diameter bolt hole is drilled, a return bolt 24 is inserted into the bolt hole, and a male screw at the tip of the return bolt 24 is screwed to the lower end surface of the tapered cylindrical body 7. A plurality of sets of coned disc springs 25 are superposed on the body of the return bolt 24 between the lower surface of the head of the return bolt 24 (upper part in the figure) in a facing state and mounted in a resilient state to form a tapered cylindrical body 7. Is biased downward.

A hydraulic pressure channel 27 is provided in the holding cylinder 5, and the end of the hydraulic pressure channel 27 faces the small sliding diameter portion 20 of the tapered cylinder 7, and the liquid pressure is supplied to the hydraulic pressure channel 27. When actuated, the liquid pressure presses between the large sliding diameter portion 19 and the small sliding diameter portion 20, and the tapered cylinder 7 moves upward using the upper sliding hole 13 and the lower sliding hole 14 as guides, thereby causing taper. The inner peripheral surface of the clamp cylinder 6 is the outer peripheral surface of the main spindle 2 and the outer peripheral surface of the clamp cylinder 6 is the taper cylindrical body due to the wedge action of the tapered female part surface of the cylindrical body 7 and the tapered male part surface of the clamp cylinder 6. 7 is pressed firmly, so that the main shaft 2 is firmly fixed to the ram 4.

When the liquid pressure is released, the return bolt 24 is moved downward by the elastic force of the disc spring 25, and the tapered cylinder 7 is lowered. At the same time, each block piece 6 _1. 6 slackness _{2.6 3.6 4} in a centrifugal direction, wedge action returns to the released source state.

Reference numeral 28 in FIG.
A rotating ring 29 that rotates together with the lower ring 14 'is a locking ring provided on the lower step portion 14'. The ring 28 and the locking ring 29 prevent foreign matter from entering the main shaft portion from the outside by a labyrinth effect. Reference numeral 30 denotes a labyrinth groove provided on the outer peripheral portion of the main shaft 2 for the same purpose.

One end of the lower end surface of the main shaft 2 is cut out in a concave shape, and an end surface key 31 is provided in this concave groove for engaging the key groove a 'of the rotary tool a. the locking groove 32 that engages the locking portion b ₃ of the tool holder b ₂ for attaching the b ₁ to穿溝.

Since the embodiment of the present invention is constructed as described above, when the rotary tool a is mounted and drilled and a tapping operation is performed, first, the taper shank 1 of the rotary tool a is fitted into the tapered hole 2 ′ of the main shaft 2. Then, when the pull stud portion of the head of the rotary tool a is pulled upward by the drawbar mechanism 52, the key groove a 'of the rotary tool a is engaged with the end face key 31 of the main spindle 2, and the rotary tool a is connected to the tapered hole of the main spindle 2. Fits tightly in 2 '.

In this state, since the moving mechanism 8 is not operated, the tapered cylinder 7 is held at the lower position by the elastic force of the disc spring 25 of the return bolt 24, and the respective block pieces 6 of the clamp cylinder 6 are held. ₁・ 6 ₂・ 6 ₃・ 6 ₄ are resilient springs 17
Therefore, the main shaft 2 is rotated via the bearings 3 by the electric motor 53 by a conventional method, so that the work w is drilled and tapped.

When performing a turning operation, a rotary tool a is extracted from the spindle 2 and a turning tool b ₁ is inserted into a tapered hole 2 ′ of the spindle 2.
The taper shank 1 of the tool holder b ₂ with the attached tool is fitted, and the tool holder b is drawn by the drawbar mechanism 52 as described above.
_{When the} pull-stat portion of the head of ₂ is pulled, the bite holder b ₂ is firmly fitted into the tapered hole 2 ′ of the main shaft 2 while the locking portion b ₃ of the bite holder b ₂ is engaged with the locking groove 32 of the holding cylinder 5. Is done.

When the liquid pressure is applied to the hydraulic pressure passage 27, the tapered cylinder 7 moves upward against the urging force of the disc spring 25 mounted on the return bolt 24, and the tapered cylinder 7 and the clamp cylinder 6 are moved upward. The main shaft 2 is firmly fixed to the ram 4 by the wedge action of the taper.

At this time, the tapered cylinder 7 and the clamp cylinder 6
Is formed in a tapered shape, so that the axis of the main shaft 2 automatically coincides with the axis of the ram 4, and the main shaft 2 is fixed to the ram 4 in the correct radial position via the bearing 3. You.

The cutting resistance of the work w is determined by the tool holder b ₂
Through the locking groove 32 from the engagement portion b ₃ of which it is transmitted to the ram 4,
Since the main spindle 2 into which the turning tool b is fitted is firmly fixed in the radial direction by the clamp cylinder 6 and the tapered cylinder 7, cutting resistance is not directly transmitted to the bearing 3 via the main spindle 2 as in the related art. Therefore, heavy cutting can be performed without deteriorating the accuracy of the bearing 3 or damaging it.

[0029]

Since the embodiment of the present invention is constructed as described above, when drilling or tapping a workpiece by mounting a rotary tool, the moving mechanism is released and the main shaft is mounted as in the conventional case. A predetermined processing can be performed on the workpiece by allowing the ram to rotate freely via the ram.

When cutting is performed with the turning tool mounted, the taper cylinder is slid in the axial direction by the moving mechanism, and the taper surface of the taper cylinder and the taper surface of the clamp cylinder are clamped by the wedge action. In a state where the outer peripheral surface of the main shaft is firmly pressed over the entire length of the inner diameter of the cylindrical body, and the outer peripheral surface of the clamp cylindrical body firmly presses the tapered cylindrical body, the main shaft is fixed to the ram and the bearing is not damaged. Since turning can be performed, there is a structure in which the cutting resistance is transmitted to the bearing via the main shaft and does not deteriorate the bearing accuracy or lead to damage, as in the conventional tooling equipment for turning centers. It is a simple and inexpensive turning center tool mounting device.

[Brief description of the drawings]

FIG. 1 is an explanatory front view showing a schematic configuration of a turning center according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a tool mounting device equipped with a rotary tool according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a main part of the tool mounting device according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a main part of a tool mounting device equipped with a turning tool according to an embodiment of the present invention.

[Explanation of symbols]

 a rotating tool b turning tool 1 taper shank 2 spindle 3 bearing 4 ram 5 holding cylinder 6 clamp cylinder 7 tapered cylinder 8 moving mechanism

Claims (1)

[Claims] 1. A turning center and a turning tool for exchanging and using a turning tool, wherein a main shaft for holding a tapered shank of the tool is rotatably provided on a ram via a bearing, and a lower end surface of the ram. A holding cylinder is attached to the inside of the holding cylinder, and an inner peripheral surface surrounds the outer peripheral surface of the main shaft and the outer peripheral surface is provided with a tapered clamp cylinder tapered downward,
This clamp cylinder is cut into a radial shape from the center along the axis to form at least three fan-shaped blocks,
An inner peripheral surface between the clamp cylindrical body and the inner peripheral surface of the holding cylinder is slidably interposed in the axial direction so that the tapered cylindrical body engages with the tapered tapered shape. A tooling device for a turning center, comprising a moving mechanism for operating a body to fix a main shaft of a clamp cylinder in a radial direction.