KR100415020B1 - High and low speed spindle unit of high frequency - Google Patents

Abstract

The present invention relates to a machine tool for processing a material while rotating a tool, as required, by rotating the spindle on which the tool is mounted at a high speed or low speed to perform rough machining as well as precision machining in one machine tool without carrying the material It is to be done.

To this end, a first stator 4 fixed inside the housing 3, a first spindle 5 to which the first rotor 6 rotating by electromotive force of the first stator 5 is fixed, and the first The second stator 7 fixed inside the spindle, the second spindle 8 on which the second rotor 9 rotating by electromotive force of the second stator is fixed, and the upper side of the second spindle is supported. Cap 10 is fixed to the housing by the fastening member 11 and the tool holder 13 is fitted to the bottom surface of the second spindle is fixed to the first spindle by the fastening member 12.

Description

High and low speed spindle unit of high frequency

The present invention relates to a machine tool for processing a material while rotating a tool, and more specifically, roughing as well as roughing in one machine tool without carrying the material by rotating the spindle on which the tool is mounted at a high speed or a low speed, as necessary. The present invention relates to a high speed and low speed spindle unit for both high and low speeds.

In general, the machine tool is equipped with a spindle for rotating the tool, the spindle has a structure that rotates as the rotational force transmitted by the drive of the motor through the gear or belt.

Accordingly, there is a limit to rotate the spindle at high speed, and there are many difficulties in precision machining of the material. Recently, a spindle unit for rotating the spindle at high speed using high frequency has been developed and used.

The high frequency spindle unit secures the stator to the housing, and the rotor to the spindle to mount the tool on the collet fixed to the spindle end, and then applies power to the coil wound on the stator. Since the magnetic force is generated to rotate the rotor at high speed, the workpiece is processed using a tool fixed to the spindle.

The high frequency spindle unit driven in this way, while the spindle rotates at a high speed, cannot obtain a strong cutting force, so roughing that requires a strong force is impossible, and thus is mainly used only in precision machining, which is a finishing process. .

Accordingly, in the initial machining of the raw material, the roughing uses a machine tool that rotates the spindle with a strong force by transmitting a rotational force through a gear or a belt according to the driving of the motor.

However, such a conventional machine tool cannot rotate the spindle at a high speed (many thousand RPM) for low speed and precision machining that requires a strong force during roughing by using a single machine tool. After roughing the material while clamping the material on a table of a general machine tool, the material should be unclamped and then transported and clamped again to a machine tool equipped with a high-frequency spindle unit capable of rotating the spindle at high speed. There was the following problem.

First, since the roughing machine tool and the machine tool equipped with the high frequency spindle unit were separately provided for processing the material, there was an economic burden due to the purchase of the machine.

Secondly, the semi-finished product, which was roughly processed between the processes, had to be transported to the machine tool equipped with the high frequency spindle unit for precision processing.

Third, productivity is reduced because it takes a long time to set a rough machining material on a table of a machine tool equipped with a high frequency spindle unit.

The present invention has been made in order to solve such a conventional problem, by configuring the spindle in two to make one spindle to rotate at a low speed and the other spindle to rotate at high speed as needed, the material in one machine tool Its purpose is to enable roughing as well as precision processing without carrying the material.

According to an aspect of the present invention for achieving the above object, a rotor for fixing the stator to generate a magnetic force as the power is applied to the coil in the housing in which the spindle is installed, and the spindle to the spindle to rotate by the magnetic force generated in the stator A fixed high frequency spindle unit comprising: a first stator fixed in an interior of a housing, a first spindle fixed with a first rotor rotating by electromotive force of the first stator, and a fixed inside of the first spindle A second spindle to which the second stator and the second rotor rotated by the electromotive force of the second stator are fixed, a cap fixed to the housing so as to support the upper side of the second spindle, and a cap of the second spindle. High frequency high, characterized in that consisting of a tool holder fitted to the bottom surface is fixed to the first spindle by a fastening member And combine the low-speed spindle unit is provided.

1 and 2 are longitudinal cross-sectional views showing the configuration of the present invention,

1 is a state diagram showing the rough machining

2 is a state diagram showing the time of precision processing

* Description of the symbols for the main parts of the drawings *

3: housing 4: first stator

5: first spindle 6: first rotor

7: second stator 8: second spindle

9: second rotor 10: cap

13 tool holder

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 and 2.

1 and 2 are longitudinal cross-sectional views showing the configuration of the present invention, in which the first stator 4 is fixed inside the housing 3 fixed to the main body 1 by the mounter 2, and the housing The first rotor 6 which rotates by the electromotive force of the said 1st stator is being fixed to the outer peripheral surface of the 1st spindle 5 of the hollow shaft provided in (3).

The second stator 7 is fixed to the inside of the first spindle 5 formed of the hollow shaft, and on the outer circumferential surface of the second spindle 8 rotatably installed inside the first spindle, an electromotive force of the second stator is applied. The 2nd rotor 9 which rotates by this is fixed.

The number of turns of the coil wound around the cores of the first and second stators 4 and 7 is not limited because it depends on the size of the spindle unit and the thickness of the coil.

On the other hand, the cap 10 for supporting the upper side of the second spindle 8 is provided on the upper surface of the housing 3 to fasten the first spindle 5 when the second spindle 8 rotates the fastening member 11. It is intended to be fixed to the furnace housing 3 in order to prevent the first spindle 5 from rotating when the second spindle 8 rotates.

In addition, the first spindle (5) is provided with a tool holder 13 is fitted to the bottom surface of the second spindle (8) when the first spindle is rotated to be fastened to the fastening member 12, which is the first spindle (5) To rotate the second spindle 8 together with the first spindle.

The tool holder 13 is provided with a receiving space 13a to accommodate the second collet 14 fixed to the second spindle 8.

Referring to the operation of the present invention configured as described above is as follows.

First, in order to rough the material while clamping the material to be processed on a table (not shown), the spindle must be slowly rotated with a strong force.

That is, the second spindle 8, which is installed at the center of the first spindle 5 and rotates at high speed, needs to rough-process the raw material while rotating only the first spindle.

To this end, as shown in FIG. 1, when the tool holder 13 is inserted into the second collet 14 of the second spindle 8, the second collet 14 is formed in the tool holder 13. The first and second spindles 5 and 8 are integrated by fixing the tool holder 13 to the first spindle 5 with the fastening member 12.

When power is applied to the first stator 4 in such a state, electromotive force is generated by the coil wound around the first stator, and the first spindle 5 to which the first rotor 6 is fixed is hundreds of thousands to thousands with strong force. Since it rotates within the RPM it is possible to rough machining the material using the tool (16a) mounted on the first collet (15).

As described above, after roughing of the raw material is completed while rotating the first spindle 5 at a low speed with a strong force, the driving of the first spindle 5 is stopped and the second spindle 8 is rotated at high speed. The material must be precisely processed.

To this end, the fastening member 12 holding the tool holder 13 to the first spindle 5 is released to separate the tool holder 13 to which the tool 16a is fixed from the first spindle and the second spindle. The tool 16b should be mounted on the second collet 14 of (8) as shown in FIG.

Thereafter, when power is applied to the second stator 7 and the second spindle 8 rotates, the first spindle 5 located outside the second stator 7 is fixed to the upper end of the housing 3 so that the first spindle 5 does not rotate. The fastening member 11 is fastened to the cap 10 supporting the spindle 5 to fix the first spindle 5 to the housing 3.

Accordingly, when the second spindle 8 is rotated by the electromotive force generated by applying power to the second stator 7 fixed to the inner circumferential surface of the first spindle 5, the first spindle 5 is connected to the fastening member ( 11) it is supported by the housing 3 and the fixed cap 10, so that it does not rotate, so that the material can be precisely processed while rotating the second spindle 8 at a high speed (a few tens of thousands of RPM).

As described above, the present invention provides the first and second spindles 5 and 8 in the housing 3 so that the first and second stators 4 and 7 are applied to the first and second stators 4 and 7, respectively. 2 Spindles can be selectively rotated so that roughing and precision machining can be performed simultaneously while rotating the tool at a low or high speed with a strong force, depending on the material's application, without carrying the clamped material on the table. In addition, it is possible to reduce the purchase cost of equipment because it is not necessary to purchase a roughing machine tool separately.

Claims (1)

A high frequency spindle unit in which a stator for generating a magnetic force is fixed to a housing in which a spindle is installed, and a rotor is fixed to a spindle for rotating the spindle by a magnetic force generated in the stator. A fixed first stator, a first spindle fixed with a first rotor rotating by electromotive force of the first stator, a second stator fixed inside the first spindle, and an electromotive force of the second stator A second spindle to which the rotating second rotor is fixed, a cap fixed to the housing so that an upper side of the second spindle is supported by a fastening member, and a bottom spindle of the second spindle, which is fixed to the first spindle by a fastening member High speed and low speed spindle unit for high frequency, characterized in that consisting of a tool holder.