JPH06335803A - Tool head with automatic balancer - Google Patents

Abstract

PURPOSE:To prevent the center of gravity of a tool head from being deviated when the slider of the tool head moves in the axial and radial direction. CONSTITUTION:A tool head 2 is attached to a main spindle 1 having therein a drive shaft 6 while at the lower part of main body 4 of the head 2 a slider driven by the drive shaft 6 is arranged slidably in the axial and radial direction. On this slider 5, a balance weight 16 is arranged and racks on the slider 5 and the balance weight 16 are meshed with a pinion, so that the balance weight 16 is interlocked with in the opposite direction of the moving direction of the slider 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool head with an automatic balancing device for preventing the center of gravity of a spindle of a machine tool from being unevenly distributed from the center of rotation.

[0002]

2. Description of the Related Art Conventionally, in machine tools such as machining centers, when carrying out boring, chamfering, grooving, taper cutting, etc., a tool head equipped with a slider equipped with a bite is used so as to be movable in the radial direction. Has been done. Such tool heads are disclosed in, for example, Japanese Patent Publication No. 4-4083, Japanese Patent Publication No. 3-10442, Japanese Utility Model Publication No. 62-16249, Japanese Utility Model Publication No. 61-40410, and the like. Is removably attached to the main shaft of a machine tool, and its movement in the radial direction orthogonal to the axis of the slider is controlled by a drive shaft provided outside or inside the main shaft.

[0003]

However, in the above-mentioned conventional example, when the slider moves in the radial direction, the center of gravity of the main shaft is unevenly distributed from the center of rotation, and the machining accuracy and the machining efficiency are reduced. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a tool head with an automatic balancing device in which the center of gravity of the spindle does not deviate from the center of rotation even if the slider moves.

[0005]

A tool head with an automatic balancing apparatus according to the present invention for achieving the above object comprises a main body mounted on a main shaft having a drive shaft which moves in the axial direction,
A slider movably provided in the main body in a radial direction orthogonal to the axis and interlocking with the drive shaft; a balance weight movably provided in a direction parallel to the slider and interlocking with the slider; the balance weight and the slider; And connecting means for connecting so as to move in mutually opposite directions.

[0006]

In the tool head with the automatic balancing device having the above-mentioned structure, the slider moves in the radial direction orthogonal to the axis when the drive shaft moves in the axial direction, and the balance weight connects the connecting means by the slider. Move in the opposite direction through the slider.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. 1 is a sectional view of a main part of this embodiment, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB. A tool head 2 is detachably mounted on a spindle 1 of a machine tool by a nut 3, and a slider 5 having a bite T is attached to a lower end of a main body 4 of the tool head 2 in a radial direction orthogonal to an axis of the main body 4. It is mounted slidably. The main shaft 1 has a hollow hole 1a through which the drive shaft 6 is inserted, a male screw 1b screwed into the female screw 3a of the nut 3, a contact end face 1c contacting the contact end face 4a of the body 4, and a female taper of the body 4. A male taper 1d that fits with 4b is provided. Here, the drive shaft 6 is installed concentrically with respect to the main shaft 1 and rotatable in the axial direction. On the contact end surface 1c of the spindle 1, the spindle 1
An appropriate number of drive keys 7 for transmitting the rotation of the main body 4 to the main body 4 are fixed by screws 7a.

On the other hand, the upper portion of the main body 4 is a flange 4c having a contact end surface 4a, and the flange 4c is provided with a number of key grooves 4d corresponding to the drive keys 7 at equal angular intervals. The lower portion of the flange 4c is an annular pressing groove 4e, and the pressing groove 4e communicates with the key groove 4d, and the claw 3b of the nut 3 is fitted therein.
An annular grip groove 4f is provided below the pressing portion 4e.
It is gripped by TC (Automatic Tool Controller). A hollow hole 4g communicating with the female taper 4b is provided at the center of the main body 4, and a piston member 8 is vertically movably fitted in the hollow hole 4g.

An appropriate number of lock holes 3c into which the arms 9a of the lock means 9 composed of, for example, a cylinder and a piston are fitted are provided on the outer periphery of the nut 3, and the arms 9a are fitted into the lock holes 3c. The nut 3 is fixed in the rotation direction.

The piston member 8 fitted in the hollow hole 4g of the main body 4 is connected to the drive shaft 6 via a connecting mechanism 10 and a shaft coupling 11. The connecting mechanism 10 is a retainer 1.
2, a sleeve 13, a steel ball 14, etc., and a drive shaft 6
By moving up and down, the connecting mechanism 10 operates, and the piston member 8 and the rotary shaft coupling are connected or separated. The lower end of the piston member 8 is a wedge-shaped portion 8a,
A cam surface 8b is formed at the lower end thereof.

Further, the slider 5 is slidable in the axial direction by fitting a fitting portion 5a formed on the slider 5 into a dovetail groove 4h formed on the main body 4. Further, the slider 5 is formed with a cam surface 5b which comes into contact with the cam surface 8b of the piston member 8 and a spring groove 5c which accommodates the spring 15, and the slider 5 is urged in the axial direction by the spring 15 to form the cam surface 5b. And the cam surface 8b are in contact with each other.

As shown in the perspective view of FIG. 4, a balance weight 16 is provided on the slider 5 so as to be movable relative to the slider 5 in order to prevent uneven distribution of the center of gravity due to the movement of the slider 5. The balance weight 16 is formed in a substantially U-shape, and is a cover member 17 fixed to the main body 4.
It is supported by a and 17b. Racks 18a and 18b are provided on both sides of the slider 5, and racks 19a and 19b are also provided on both sides of the balance weight 16. A pinion 20 is provided between the rack 18a and the rack 19a.
a is engaged, and a pinion 20b is engaged between the rack 18b and the rack 19b. These pinion 20
The a and 20b are rotatably attached to the lower portion of the main body 4.

On the other hand, as shown in FIG. 5, the main spindle 1 to which the tool head 2 is attached has a main spindle head 21 and bearings 2.
It is rotatably supported via 2 and 23, and is rotationally driven by the drive means 24. A nut 25 is fixed to the upper end of the hollow hole 1a of the main shaft 1, and the drive shaft 6 is spline-coupled to the nut 25 so that the drive shaft 6 is integrated with the nut 25 in the rotation direction. It is supposed to be movable in the axial direction. A screw shaft 27 is connected to the upper end of the drive shaft 6 via a joint 26, and a screw nut 28 is connected to the screw shaft 27 by a ball screw mechanism and fixed to a fixed portion of the machine tool. A pulley 29 is fixed to the outside of the screw nut 28.
Is connected to a servo motor 32 via a timing belt 30 and a pulley 31, so that the drive shaft 6 is driven by the servo motor 32, and the main shaft 1 driven by the drive means 24 and the servo motor 32. The drive shafts 6 driven by 32 are individually driven.

When the servo motor 32 is rotated by such a configuration, this rotation is transmitted to the screw nut 28 via the pulley 31, the timing belt 30, and the pulley 29,
The screw nut 28 rotates. By the rotation of the screw nut 28, the screw shaft 27 moves in the axial direction, and the drive shaft 6 splined to the nut 25 moves in the axial direction.
By the movement of the drive shaft 6, the rotary shaft coupling 11 and the coupling mechanism 10
The piston member 8 coupled via the shaft moves in the axial direction. When the piston member 8 moves, the cam surface 8b and the cam surface 5b that are in contact with each other move, and the slider 5 moves in the axial direction. By moving the slider 5, the rack 18a,
The pinions 20a and 20b rotate via 18b, and the racks 19a and 19b are rotated by the rotation of the pinions 20a and 20b.
The balance weight 16 moves the slider 5 in the opposite direction via b.

Thus, when the slider 5 moves in the radial direction orthogonal to the axis, the center of gravity of the main shaft 1 tends to be unevenly distributed from the center of rotation, but the balance weight 16 moves in the opposite direction, so that the center of gravity of the main shaft 1 is The equilibrium state of the center of rotation is maintained.

In this embodiment, the tool head 2 is connected to the main spindle 1 by using the nut 3, but a male taper is formed on the main body 4 and a female taper is formed on the main spindle 1 to fit them. You may make it connect. Also in this case, it is better to install the drive shaft 6 at the center of the main shaft 1 or the main body 4. Further, although the connecting mechanism 10 including the retainer 12, the sleeve 13, the steel ball 14 and the like is used to connect the piston member 8 to the drive shaft 6, another connecting mechanism may be used. Further, although the balance weight 16 is formed in a substantially U shape, if the weight of the cutting tool T is large, for example, another balance weight can be added to the slider 5 according to the weight of the cutting tool T. Further, the slider 5 and the balance weight 16 are connected by the racks 18a, 18b, 19a, 19b and the pinions 20a, 20b. However, if the means for interlocking the slider 5 and the balance weight 16 in mutually opposite directions, the structure thereof Is not a question.

[0017]

As described above, in the tool head with an automatic balancing apparatus according to the present invention, the balance weights are moved in opposite directions to each other through the connecting means, so that the center of gravity of the main shaft is unevenly distributed from the center of rotation. This can be prevented, and the processing accuracy and processing efficiency of the workpiece can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a perspective view of a slider and a balance weight.

FIG. 5 is an overall sectional view.

[Explanation of symbols]

 1 Spindle 2 Tool Head 4 Main Body 5 Slider 6 Drive Shaft 8 Piston Member 10 Connecting Mechanism 16 Balance Weight 18a, 18b, 19a, 19b Rack 20a, 20b Pinion

Claims (2)

[Claims] 1. A main body mounted on a main shaft having a built-in drive shaft that moves in the axial direction, a slider that is movably provided in the main body in a radial direction orthogonal to the axis, and interlocks with the drive shaft, and a slider that is parallel to the slider. A balance weight that is movable in any direction and that interlocks with the slider, and a connecting means that connects the balance weight and the slider so as to move in opposite directions. . 2. The connecting means comprises a first rack provided on the slider, a second rack provided on the balance weight, and a pinion meshing with the first and second racks. Item 1. A tool head with an automatic balancing device according to item 1.