JPH1170428A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize be movable, and reduce the frequency of receiving the effect of the vibration by using leveler means to insulate the heat generated from a NC device which is incorporated in a base, from being transmitted to a machine main body and by preventing the vibration from being transmitted from a basic floor which has the base installed therein to the machine main body. SOLUTION: Leveler means 41 are installed in three positions on the top face of a base 1 so as to support the bottom face of a machine main body 11. Partial heat transmitted from the base l to the leveler means 41 is less transmitted to the machine main body 11 because of a heat insulating means of the leveler means 41. The leveler means 41 forms an air layer between the base 1 and the machine main body 11 so as to reduce the heat transmission further. The heat generated from the main body part 5A of the NC device 5 is less affected to the machine main body 11. The vibration from a basic floor can be prevented from being transmitted to the machine main body 11 by a vibration control means of the leveler means 41 so that the vibration is less affected to the machine main body 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a machine tool controlled by an NC device. More specifically, the present invention relates to a machine tool suitable for ultra-precision processing, fine processing, and the like.

[0002]

BACKGROUND ART A machine tool having a spindle head (aerostatic bearing spindle head) having a built-in spindle supported by an aerostatic bearing is known as a machine tool suitable for ultra-precision machining or micromachining. . The aerostatic bearing spindle head can achieve high-precision high-speed rotation due to the characteristics of the aerostatic bearing, so that finishing can be efficiently performed at a large cutting feed rate.

Recently, it has been possible to perform high-efficiency machining at a cutting feed speed of several meters per minute by rotating the spindle at a high speed of about several tens of thousands of revolutions per minute by utilizing the characteristics of the aerostatic bearing. Attempted. However, when the main spindle is rotated at a high speed of about several tens of thousands of revolutions per minute, vibrations are generated, so that there is a problem that high finished surface accuracy cannot be secured.

To solve this problem, the present applicant has previously proposed Japanese Patent Application No. 8-149104, "Machine Tool". In a machine tool including a bed having a table, a column erected on one end of the bed, and a spindle head provided on the column, the upper part of the column and the other end of the bed are connected to each other. Even if the spindle head has a built-in spindle that rotates at high speed by connecting with the support, the bed has been installed by reducing the occurrence of vibration, etc. and making the bed larger and heavier. It is designed to suppress the influence of vibration from the foundation floor.

[0005]

By the way, even with this type of machine tool, there is a demand for a machine tool that is smaller and can be moved in an installation place. However, in the above-mentioned structure, the bed is made large and heavy to suppress the influence of vibration from the base floor where the bed is installed, so it is difficult to install and move it, and a large installation place is secured. There was a problem that had to be done.

When the table is configured to move the table in the X and Y directions perpendicular to the plane and the spindle head in the Z direction perpendicular thereto, these movements are controlled by the NC device. Usually the NC
Since the device was installed near the machine body, there was also a problem of taking up space.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a machine tool which is small and movable, and which is hardly affected by vibration.

[0008]

According to the present invention, there is provided a machine tool comprising:
A machine tool controlled by a C device, a base including at least a part of the NC device, a machine body mounted on the base and driven and controlled by the NC device, the base and the machine body, A leveler means provided between the base, the leveler means comprising: a heat shut-off means for shutting off transmission of heat from an NC device incorporated in the base to the machine body; and a base on which the base is installed. Vibration isolating means for preventing vibration from the floor from being transmitted to the machine body.

Therefore, according to the above configuration, the base for supporting the machine main body is formed separately from the machine main body, and at least a part of the NC device is built in the base. Can be configured as possible. In addition, since the leveler means is interposed between the base and the machine main body, the heat generated from the NC device built in the base can be cut off by the leveler means.
The effect of vibration from the foundation floor can be suppressed. Therefore, it is possible to provide a small and movable machine tool that is less affected by vibration.

In the above configuration, if the base includes a movable caster, the base can be moved more easily.

In the above structure, it is preferable that the machine main body includes an air bearing spindle head which rotatably supports a main shaft on which a tool is mounted by an air bearing. In the air bearing spindle head, high-precision high-speed rotation can be obtained, so that high-efficiency machining can be realized.

In this case, the machine body includes a slider for holding the air bearing spindle head, a cross rail for movably holding the slider, and a lower portion larger than the upper portion for holding both ends of the cross rail. It is desirable to have a column which is provided. According to this, even in the case of an air bearing spindle head whose main spindle rotates at a high speed, the occurrence of vibration can be reduced, so that a highly-accurate finished surface can be secured while realizing highly efficient machining.

Further, it is desirable that the machine main body is provided with a splash guard whose inside can be seen through and which can be opened and closed. According to this, the operator can continue the work while observing the state of the work or the tool being machined.

It is preferable that an air flow means for dissipating heat from the NC device built in the base is provided. Thereby, heat generated from the NC device built in the base can be efficiently radiated to the outside, so that the influence of the heat can be reduced as much as possible. At this time, it is more economical if the air is supplied to the air flow means and the air bearing spindle head by one air source.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a machine tool according to the present embodiment, and FIG. 2 is a sectional view thereof. As shown in these drawings, the machine tool according to the present embodiment is a machine tool controlled by an NC device, and includes a base 1 and a machine main body which is installed on the base 1 and driven and controlled by an NC device 5. 11, a leveler means 41 provided between the base 1 and the machine main body 11, and an air flow means 51 provided on the back side of the machine main body 11.

The base 1 is formed in a rectangular base shape, and a plurality of movable casters 2 and height-adjustable legs 3 are attached to the bottom surface thereof, and a space 4 is formed inside. . At least a part of the NC device 5 that drives and controls the machine body 11 is built in the space 4. Here, the main body portion 5A excluding the display device 5B is built in, but may be another portion.

The machine main body 11 is a bed 1 mounted on the upper surface of the base 1 via the leveler means 41.
2, a table 13 provided on the upper surface of the bed 12 so as to be movable back and forth (Y direction), a pair of columns 14 and 15 erected on both sides of the bed 12, and a pair of columns 14 and 15. Cross rail 16 spanned between upper parts
Along the cross rail 16 in the left-right direction (X direction)
The slider 17 is provided so as to be movable in the vertical direction, the spindle head 18 is provided in the slider 17 so as to be able to move up and down in the vertical direction (Z direction), and the inside is provided so as to cover the front part between the columns 14 and 15. A splash guard 19 that can be seen through and that can be opened and closed in the vertical direction with the upper end as a fulcrum.

The bed 12 is provided with a guide (not shown) for guiding the table 13 and a Y-axis drive mechanism 21 for moving the table 13 in the Y direction. As the Y-axis drive mechanism 21, a feed mechanism including a motor and a feed screw shaft rotated by the motor is used. A joystick 22 for manual operation for moving the table 13 in the Y direction, moving the slider 17 in the X direction, and moving the spindle head 18 in the Z direction is provided on the front end face via the NC device 5. I have. Each of the columns 14 and 15 is formed in a substantially triangular shape in which a side surface shape is wider at a lower portion than at an upper portion. Thus, since the lower portion has a stable structure, even if the spindle head 18 rotates at a high speed, generation of vibration can be reduced.

The cross rail 16 is provided with two guide rails 23 for movably guiding the slider 17 and an X-axis drive mechanism 24 for moving the slider 17 in the X direction. . The slider 17 has a guide (not shown) for guiding the spindle head 18 in the Z direction, and a spindle head 18.
There is provided a Z-axis drive mechanism 25 for raising and lowering in the Z direction. As for the drive mechanisms 24 and 25, similarly to the Y-axis drive mechanism 21, a feed mechanism including a motor and a feed screw shaft rotated by the motor is used.

The spindle head 18 comprises an air bearing spindle head as shown in FIG. That is, a housing 31 is provided on the cross rail 16 so as to be able to move up and down and is moved up and down by the Z-axis drive mechanism 25, and the housing 31 has air bearings 32, 33,
The air bearing spindle head is provided with a main shaft 35 rotatably supported through a shaft 34 and parallel to the Z direction and having a flange 35A on the way, and a motor 36 for driving the main shaft 35 to rotate.

On the inner peripheral surface of each of the air bearings 32, 33, and 34, a plurality of outlets 37 for blowing air toward the main shaft 23 from a direction orthogonal to the axis are formed. A radial bearing for supporting the main shaft 35 in the radial direction is formed by the air jetted from each of the outlets 37. A plurality of outlets 38 for ejecting air toward the flange 35A of the main shaft 35 are formed on the axial end faces of the air bearings 33 and 34 facing each other. A thrust bearing for supporting the main shaft 35 in the thrust direction by the air jetted from each of the outlets 38 is formed. In FIG. 3, reference numeral 39 denotes an air supply passage for supplying high-pressure air to each of the outlets 37 and 38, 40 denotes an exhaust passage, and T denotes a tool.

The leveler means 41 is installed at three places on the upper surface of the base 1 (on the front center and on the rear side) and supports the bottom surface of the machine body 11. The leveler means 41 arranged at each position is provided with an NC built in the base 1 in addition to the height level adjusting means of the machine body 11.
A heat blocking means for blocking heat from the main body portion 5A of the device 5 from being transmitted to the machine body 11, and a vibration isolating means for preventing vibration from a base floor on which the base 1 is installed from being transmitted to the machine body 11; And

More specifically, as shown in FIG. 4, three wedge members 42, 43, 44 and an intermediate wedge member 43 are moved forward and backward with respect to the upper and lower wedge members 42, 44 to form an upper wedge member. It comprises a screw-type adjustment mechanism 45 for adjusting the height level of 42 and a vibration-insulating member 46 having heat insulation attached to the lower surface of the lower wedge member 44. The anti-vibration member 46 is made of rubber or plastics mixed with vegetable fibers (for example, shiroko) and formed into a predetermined thickness, and thus has a heat-shielding function and an anti-vibration function.

The air flow means 51 includes a cover 52 installed on the back side of the machine main body 11 and communicating with the space 4 of the base 1, an air outlet 53 provided on the upper surface of the cover 52, 53 and a fan (not shown). By driving the fan, an airflow is formed that flows from the space 4 of the base 1 through the cover 52 to the outside from the outlet 53. Reference numeral 54 denotes a compressor for supplying air to the air bearing spindle head 18, but the air flow may be formed by using the compressor. Further, instead of the compressor, an air flow may be formed using an air pipe or the like provided in a factory.

Next, the operation of the present embodiment will be described. In processing the work, after setting the work on the table 13, the table 13 and the spindle 35 are relatively moved in the X, Y, and Z directions by the NC device 5 or the joystick 22, and the tool mounted on the spindle 35 is processed. Work is processed by T. That is, the table 13 is mounted on the main shaft 35 while moving the table 13 in the Y direction via the Y-axis drive mechanism 21 and moving the spindle head 18 in the X and Z directions via the X-axis drive mechanism 24 and the Z-axis drive mechanism 25, respectively. The workpiece is machined by the tool T.

During this time, even when the main shaft 35 is rotated at a high speed, both ends of the cross rail 16 supporting the spindle head 18 having the main shaft 35 are held by the generally triangular columns 14 and 15 whose lower part is wider than the upper part. Therefore, generation of vibration can be reduced. Most of the heat generated from the main body portion 5A of the NC device 5 built in the base 1 is radiated to the outside by the air flow of the air flow means 51. Base 1 to leveler means 4
1 is less likely to be transferred to the machine body 11 by the heat blocking means of the leveler means 41, and an air layer is formed between the base 1 and the machine body 11 by the leveler means 41. Therefore, heat conduction can be further reduced, so that heat generated from the main body portion 5A of the NC device 5 hardly affects the machine main body 11.

Also, vibration from the base floor on which the base 1 is installed is not transmitted to the machine body 11 by the vibration isolating means of the level means 41, so that the vibration does not affect the machine body 11.

Therefore, according to the present embodiment, the machine body 1
Since the base 1 for supporting the main body 1 is formed separately from the machine main body 11, and the main body 5A of the NC device 5 is built in the base 1, the base 1 can be configured to be small and movable. In addition, since the casters 3 are provided on the bottom surface of the base 1, the movement is easy. Further, since the leveler means 41 is interposed between the base 1 and the machine main body 11, the heat generated from the NC device 5 built in the base 1 can be cut off by the leveler means 41 and the leveler means 41 can be removed from the base floor. The effect of the vibration of can be suppressed.

The machine body 11 includes a bed 12, a table 13 provided on the upper surface of the bed 12 so as to be movable in the Y direction, and a pair of columns 14, 15 erected on both sides of the bed 12. A cross rail 16 spanned between the two columns 14 and 15;
Slider 17 movably provided in the X direction along
And a spindle head 18 provided on the slider 17 so as to be able to move up and down in the Z direction, and the side surfaces of the columns 14 and 15 are formed in a substantially triangular shape in which the lower part is wider than the upper part. Even if the spindle of the spindle head 18 rotates at high speed, the generation of vibration can be reduced, and a highly accurate finished surface can be obtained.

The spindle head 18 is connected to the spindle 35
Is an air bearing spindle head rotatably supported by air bearings 32, 33, and 34. In other words, with the air bearing spindle head, high-precision high-speed rotation can be obtained, so that machining can be efficiently performed at a large cutting feed rate. Can be done. Further, since the splash guard 19 which can be opened and closed is provided so as to cover the front portion between the columns 14 and 15, the machining operation can be continued while observing the state of the workpiece or the tool being machined. .

An air flow means 5 for dissipating heat from the main body 5A of the NC device 5 built in the base 1.
1, the heat generated from the main body portion 5A of the NC device 5 can be efficiently radiated to the outside.

In the above embodiment, the spindle head 18 is an air bearing spindle head whose main shaft is rotatably supported by an air bearing. However, the present invention is not limited to this. A spindle head in which the main shaft is rotatably supported by a ball bearing or the like may be used.

[0033]

According to the machine tool of the present invention, it is possible to expect an effect that it is small and movable, and is less affected by vibration.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a machine tool according to the present invention.

FIG. 2 is a longitudinal sectional view of the embodiment.

FIG. 3 is a sectional view of a spindle head according to the embodiment.

FIG. 4 is a perspective view of a leveler means in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Caster 5 NC apparatus 5A Main part of NC apparatus (part of NC apparatus) 11 Machine main body 14, 15 Column 16 Cross rail 17 Saddle 18 Spindle head 19 Splash guard 41 Leveler means 51 Air flow means 54 Compressor (Air source )

Claims (7)

[Claims] 1. A machine tool controlled by an NC device, comprising: a base including at least a part of the NC device; a machine body mounted on the base and driven and controlled by the NC device; And a leveler means provided between the main body and the machine body, the leveler means comprising: a heat shutoff means for blocking heat generation from an NC device incorporated in the base from being transmitted to the machine body; A vibration isolating means for preventing vibration from a foundation floor on which is installed to be transmitted to the machine main body. 2. The machine tool according to claim 1, wherein the machine main body includes an air bearing spindle head having a main shaft on which a tool is mounted rotatably supported by an air bearing. . 3. The machine tool according to claim 2, wherein the machine body includes a slider for holding the air bearing spindle head, a cross rail for movably holding the slider, and both ends of the cross rail. And a pair of columns having a lower portion formed larger than the upper portion. 4. The machine tool according to claim 1, wherein the machine body is provided with a splash guard whose inside is transparent and can be opened and closed on a front surface portion. Machine Tools. 5. The machine tool according to claim 1, wherein the base includes a movable caster. 6. The machine tool according to claim 1, further comprising an air flow means for dissipating heat generated from said NC device built in said base. . 7. The machine tool according to claim 6, wherein the machine body includes an air bearing spindle head having a main shaft on which a tool is mounted rotatably supported by an air bearing, and supplies the spindle to the air bearing spindle head. A machine tool comprising a common air source for air to be used and air used in the air flow means.