JPH0631581A - Machining center - Google Patents

Abstract

PURPOSE:To provide a machining center which can always pour water to a working point freely in the horizontal direction and vertical direction. CONSTITUTION:A machining center is equipped with a water pouring device which consists of ring gears 22 and 23 installed in the lower part of the spindle outer cylinder of a machining center, ring gear positioning means which turns the ring gears 22 and 23 in the peripheral direction and positions the ring gears 22 and 23 at a prescribed position, installation block 24 which is formed integrally on the undersurface of the ring gear 23, water pouring nozzle 27 which extends from the installation block 24, liquid feeding means for feeding liquid, and a turning means for turning the root part side horizontal part of the water pouring nozzle 27 in the peripheral direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining center capable of constantly injecting a cooling liquid or the like into a working place.

[0002] In recent years, from the viewpoint of streamlining and unmanned production lines, a machining center (multi-function machine tool) capable of automatically and highly efficiently performing various machining processes such as milling, tapping and boring has been widely used. The machining center is generally as shown in FIG. 7, in which a spindle 3 is rotatably supported by a spindle outer cylinder 2 via a bearing 1, and a tapered chuck portion 4 provided on the lower end side of the spindle 3. The fitting taper portion 6 of the tool holder 5 is fitted and held in the.
A machining tool 8 is attached to the tool connecting shaft 7 below the tool holder 5 with a screw 10. Then, by rotating the spindle 3 at high speed, the machining tool 8 is rotated together with the tool holder 5, and the machining tool 8 can be pressed against a workpiece (not shown) to machine the workpiece. .

Even in the automatic machining by the machining center, it is necessary to inject the cooling liquid, the grinding liquid, etc., as in the normal machining work, and a water injection nozzle for discharging the cooling liquid, etc. is provided at an appropriate place in the machining center. Has been.

[0004]

However, since the water injection nozzle is fixed on the machining center side, when the machining points change one after another, the water injection direction cannot follow the change, and it is not appropriate. There is a problem that it becomes water injection and the heat generated during processing cannot be effectively cooled. If the water injection is off target, the machining tool will be damaged and the machining accuracy will be reduced. For this reason, the water injection nozzle is extended as shown in FIG. 8 so that the direction can be freely changed with fingers. However, the water injection nozzle 9 also has a limited range of water injection, In addition, changing the direction of the water injection nozzle 9 with each finger is complicated and not preferable.

Therefore, the present inventor has developed a water injection device for a machining center which can always inject water toward a processing point, and has already applied for a series of water injection devices (Japanese Patent Application No. Sho 6).
2-70847, application dated March 25, 1987). An example of these devices is shown in FIG. In this water injection device, a gear ring 11 is attached to a lower end portion of a spindle outer cylinder 2 so as to be rotatable in a circumferential direction and held by a support ring 12, and a water injection block 13 is attached to a lower end surface of the gear ring 11. From the side to the water injection block 13, water injection pipe 1
4 is connected, and water can be injected near the processing tool 8 via the water injection pipe 15 and the water injection nozzle 16. Two of the water injection nozzles 16 extend to the front side and the other side of the processing tool 8, and the tip end portion 16a thereof is shown in FIG.
As shown in FIG. 1 (a), the processing tool 8 and the workpiece 20 are aimed at a processing point where they are pressed against each other. In addition, 17
Is a winding part attached to the water injection pipe 15, and the water injection block 13 is rotated with the rotation of the gear ring 11, as will be described later. The extra portion is wound around this so that the water injection hose 18 extending to (not shown) does not hang down and contact the tool holder 5 and the processing tool 8.

According to the above-mentioned water injection device, since the ring gear 11 can be rotated by an appropriate rotary drive means provided on the side of the machining center, the water injection nozzle 16 can be moved in accordance with the movement of the machining point. It can be rotated in the horizontal direction, and water can always be injected aiming at the processing point. For example, as shown in FIG. 11A, when processing the periphery of a square work piece 20 from the point A to the point B, the water injection nozzle 16 is arranged as shown in FIG.
As shown in FIG. 6B, when processing from point B to point C, the water injection nozzle 16 is rotated by 90 °. In this way, water injection can always be aimed at the processing point. Therefore, it is possible to inject water much more effectively than in the past.

However, when the mounting position of the machining tool 8 or the length of the tool 8 itself up to the cutting edge is different, the height of the machining point is changed. Therefore, the water injection nozzle 16 is horizontally rotated by the water injection device. However, there is a problem in that the vertical shift cannot be eliminated and the proper processing point cannot be aimed. Therefore, when the processing point changes in the height direction, as shown in FIG. 9, the inclination angle of the tip end portion 16a of the water injection nozzle 16 is changed as shown by an arrow P so as to aim at the processing point. There is a strong need for improvement.

The present invention has been made in view of the above circumstances, and provides a machining center incorporating a water injection device which can change the water injection horizontally and vertically and can always inject water toward a processing point. To that end.

[0009]

To achieve the above object, a machining center according to the present invention comprises a ring gear rotatably attached to a lower portion of a spindle outer cylinder of the machining center and a predetermined position by rotating the ring gear in a circumferential direction. A ring gear positioning means for positioning the ring gear, a mounting block integrally mounted on the lower surface of the ring gear, one end side horizontally and rotatably fitted to the side surface of the mounting block, and the other end side having a liquid discharge port at the tip end in the discharge direction. And a liquid supply means for supplying a liquid to the water injection nozzle, and a water injection device comprising a rotating means for rotating a horizontal portion on the base side of the water injection nozzle in the circumferential direction. To take.

[0010]

Operation: That is, in this machining center, a mounting block for water injection is attached to a ring gear that rotates in accordance with the movement of a machining point, and a side surface of this mounting block
Attach the root of the water injection nozzle horizontally and freely,
By incorporating a rotating means for rotating the root portion in the circumferential direction, the water injection nozzle is incorporated not only for horizontally rotating the water injection nozzle but also for moving the tip of the water injection nozzle up and down. Is. Therefore, according to this machining center, when the machining point moves in the horizontal direction, the gear ring is rotated according to this movement angle so that the tip of the water injection nozzle always aims at the machining point, and the machining point moves in the height direction. In the case of changing to, it is possible to rotate the horizontal root part of the water injection nozzle and raise and lower its tip so as not to shift from the processing point.

Next, the present invention will be described in detail based on embodiments.

[0012]

1 shows an embodiment of the present invention.
The basic structure of this machining center is the same as that shown in FIG. 7, and the same parts are designated by the same reference numerals. However, as shown in the figure, a special water injection device is incorporated in this machining center, which is a major feature. That is, in the figure, reference numeral 21 denotes a ring-shaped guide portion, which holds two upper and lower ring gears 22 and 23 rotatably fitted to the spindle outer cylinder 2 from below. The ring gears 22 and 23 are individually rotated in the circumferential direction by a motor or the like attached to the machining center body side.

A mounting block 24 for water injection is mounted on the lower surface of the lower gear ring 23 of the gear rings 22 and 23.
The water injection pipe 25 is attached to the outward side surface 24 a of the. A water supply hose 26 extending from a water supply source (not shown) is connected to the water supply pipe 25, and cooling water is supplied to a water supply passage formed in the mounting block 24. This irrigation channel is a mounting block 2
4 communicates with a water injection nozzle 27 rotatably attached to the front side surface 24 b of the water injection nozzle 4, and the tip portion 2 of the water injection nozzle 27.
The cooling liquid is discharged from 7a toward the processing point. The rotatable mounting portion of the water injection nozzle 27 is sealed in a liquid-tight state.

The root portion L of the water injection nozzle 27 extends horizontally from the side surface 24b of the mounting block 24, as shown in FIG. 2 when the portion is looked up from below, and the bevel gear 28 is integrated with this horizontal portion. Is fitted on. The bevel gear 28 is the second bevel gear 2 orthogonal to the bevel gear 28.
A pinion 32 that meshes with the rack 9 (see FIG. 3) is mounted on the mounting shaft 30 of the second bevel gear 29. 33 is
A bearing that rotatably supports the shaft 30 and hangs from the lower surface of the gear ring 23.

A rack 31 that meshes with the pinion 32.
As shown in FIG. 3, since the upper part is connected and integrated with the lower end part of the shaft body 34, the upper part of which is screw-fixed to the upper ring gear 22, it moves integrally with the upper ring gear 22. . The lower ring gear 23 is provided with a long hole 35 (see FIG. 4 looking up from below) for escaping the shaft body 34 and the rack 31.

Therefore, according to this machining center, the rotational drive given to the upper and lower ring gears 22 and 23 is
If it is shifted vertically or only one of them is rotationally driven, the rack 31 that moves integrally with the upper gear ring 22 and the lower gear ring 23 move integrally due to the difference in rotation. The position of the rack 31 is relatively displaced from that of the pinion 32, and this displacement causes the rack 31 to move.
Rotates the pinion 32, which rotates the second bevel gear 2
9 is transmitted to the bevel gear 28 and the water injection nozzle 2
The horizontal part of 7 can be rotated. Therefore, as shown by an arrow P in FIG. 1, the entire water injection nozzle 27 rotates in the vertical direction and the tip portion 27a moves up and down, so that the height in the water injection direction can be changed. If it is not necessary to change the water injection direction up and down, the upper and lower ring gears 22, 23
By integrally rotating the water injection nozzles in synchronization with each other, the water injection nozzle 27 is rotated only in the circumferential direction without moving in the vertical direction so as to follow the movement of the processing point on the horizontal plane.

As a result, the water injection nozzle 27 not only rotates in the circumferential direction by the rotation of the gear rings 22 and 23 to follow the change in the machining point in the horizontal plane, but also changes the type and attachment position of the machining tool 8. It is possible to follow the height difference of the processing point due to the difference, and it is possible to more accurately inject water to the processing point.

In the above embodiment, in order to rotate the water injection nozzle 27 in the vertical direction, the two gear rings 22,
However, the method of moving the water injection nozzle 27 up and down is not limited to this. For example, as shown in FIG. 5, the number of gear rings 40 is one, and a small motor 41 is attached to the attachment block 24 attached to the lower surface of the gear ring 40. The water injection nozzle 27 is attached from the motor 41 via the pulley 42 and the timing belt 43. The water injection nozzle 27 may be rotated in the vertical direction by rotationally driving the pulley 44 fitted on the horizontal portion L of the above.

In the above embodiment, the number of water injection nozzles 27 is one, but two water injection nozzles 27 may be provided so that water can be injected from both sides toward the processing point. . In this case, for example, when using a pulley and a timing belt, the motor 50 to the shaft 51
Are extended so that the water injection nozzles 27 are simultaneously driven to rotate. Of course, as in the previous embodiment, the two water injection nozzles 27 may be rotated in the vertical direction by rotating the bevel gear according to the rotation difference between the two gear rings 22 and 23.

[0020]

As described above, according to the machining center of the present invention, the mounting block for water injection is attached to the ring gear that rotates in accordance with the movement of the machining point, and the root of the mounting block is horizontally and rotatably attached to the side surface of the mounting block. A special water injection device is provided in which a water injection nozzle to which the section is attached is provided, and a root portion of the water injection nozzle rotates in the circumferential direction. For this reason, the water injection nozzle not only rotates in the horizontal direction together with the gear ring and the mounting block, but also its tip moves up and down. Therefore, according to this water injection device, when the machining point moves in the horizontal direction, the gear ring is rotated in accordance with this movement angle so that the tip of the water injection nozzle always aims at the machining point, and the machining point rises in height. When changing in the direction, the horizontal root portion of the water injection nozzle can be rotated so that its tip is moved up and down so as not to be displaced from the processing point. For this reason, it is possible to perform water injection aiming at the processing point very accurately, and it is possible to improve the processing accuracy and processing efficiency and to extend the service life of the processing tool.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory view of an essential part of the above embodiment, looking up from below.

FIG. 3 is an explanatory view of a main part of the above embodiment as viewed from the front.

FIG. 4 is an explanatory view of the ring gear of the above embodiment, which is looked up from below.

FIG. 5 is an explanatory view of a main portion of another embodiment of the present invention, which is looked up from below.

FIG. 6 is an explanatory view of a main portion of still another embodiment of the present invention, which is looked up from below.

FIG. 7 is a vertical cross-sectional view showing a conventional machining center.

FIG. 8 is a partial perspective view showing a water injection mechanism of a conventional machining center.

FIG. 9 is an explanatory diagram of a problem of the water injection mechanism.

FIG. 10 is an explanatory view of a water injection mechanism of the improved machining center.

11A and 11B are operation explanatory views of the water injection mechanism.

[Explanation of symbols]

 22,23 Ring gear 24 Mounting block 27 Water injection nozzle 28,29 Bevel gear 31 Rack 32 Pinion

Claims (1)

[Claims] 1. A ring gear rotatably attached to a lower portion of a spindle outer cylinder of a machining center, ring gear positioning means for rotating the ring gear in a circumferential direction to position the ring gear at a predetermined position, and an attachment integrally attached to a lower surface of the ring gear. A block, a water injection nozzle that has one end side horizontally and rotatably fitted to the side surface of the mounting block, and the other end side that has a liquid discharge port at the tip and extends in the discharge direction, and a liquid supply that supplies liquid to the water injection nozzle A machining center comprising: means and a water supply device comprising a rotating means for rotating a horizontal portion of the water injection nozzle at the base side in the circumferential direction.