JPS6012679Y2 - Machining center spindle cleaning device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a spindle cleaning device for a machining center.

A spindle head 41 that moves up and down using a column 40 as a guide shown in FIGS. In a machining center 48 comprising a work feed device 47 equipped with a feed table 46 that moves in the front-rear and lateral directions, as shown in FIG. The tapered inner circumferential surface 51 of the tool receiver part 50 formed at the tip end of the tool holder is designed to properly hold the chuck body 53 that chucks the tool 52 and to improve machining accuracy. and cleaned before installing the next chuck body.

The above cleaning means includes an air passage 54 provided on the outer periphery of the spindle 49, that is, on the side of the spindle head 41, an air passage 55 formed in the radial direction of the spindle 49, and a clamp inserted in the axial direction of the center of the spindle 49. Air is supplied to the air passage of the bar 56, and the air is jetted from the jet hole at the tip of the air passage onto the tapered inner circumferential surface 51 of the tool receiver part 50 to remove cutting powder and dust. There is.

However, the seal 57 at the sliding contact portion between the main shaft 49 and the main shaft head 41 that rotatably supports the main shaft 49
is extremely difficult and the sealing material is damaged in a short period of time, resulting in
There is a problem that air leaks from this damaged portion, reducing the reliability of cleaning.

In addition, there is also a clamp bar that has a through hole in the center from the spout to the rear end to supply air, but this requires a long through hole, which is not desirable in terms of manufacturing or strength. .

This idea was devised in view of the above-mentioned conventional problems, and the main shaft of a machining center is constructed in such a way that air passages are not formed in the sliding contact parts, preventing air leakage between the passages, and allowing proper cleaning at all times. The purpose is to provide cleaning equipment.

Embodiments of this invention will be described below with reference to the drawings.

In Figure 1, 1 is the main shaft, 2 is the main shaft head, and the main shaft 1
is rotatably attached to a spindle head 2 via a bearing member 3, and the spindle head 2 is built into a column 4 of a machining center and reciprocates up and down, similar to the structure explained in the conventional example above.

The spindle head 2 has a built-in indexing mechanism 6 that indexes the spindle 1 to a quasi-reference position in the rotational direction, and is composed of, for example, a proximity switch 5 and a protrusion described later, and further stops the spindle 1 at an accurate fixed position in the rotational direction. A main shaft position indexing cylinder 7 is provided with a positioning portion 7a for adjusting the position.

The main shaft 1 has a tool receiving part 9 formed with a tapered inner circumferential surface 8 that widens toward the tip at its axial tip, and a driven pulley 10 is attached to its rear end, as shown in FIG. As such, a fixed position indexing stopper 11 is formed on the outer periphery of the shaft portion.

Therefore, the positioning portion 7a is brought into contact with the stopper 11 by the operation of the cylinder 7, and by bringing the positioning portion 7a into close contact with the stopper 11, the main shaft 1 is stopped at a fixed position in the rotational direction.

A first air passage 28 is formed in the positioning portion 7a, the upstream end of which is connected to an air supply source such as a near compressor (not shown) via a supply pipe 29, and the downstream end of which is open to the contact surface with the stopper. ing.

The driven pulley 10 is connected to a motor 13 via a belt 12.
The drive pulley 15 is connected to a drive pulley 15 fixed to a drive shaft 14 so as to be rotatable at the same time.

Therefore, the driving force of the motor 13 is transmitted to the main shaft 1 through the power transmission path of the drive shaft 14 → driving pulley 15 → belt 12 → driven pulley 10, and rotates the main shaft 1.

The indexing mechanism 6 includes a protrusion 1 provided on the driven pulley 10.
0a and the above-mentioned proximity switch 5, when the machining of the workpiece (not shown) is completed, the main spindle 1 is rotated at a low speed,
When the protrusion 10a approaches the proximity switch 5, this is detected and the rotation of the motor 13 is stopped. It is held in a position where it can come into contact with the positioning part 7a.

A clamp bar 16 is fitted inside the main shaft 1 so as to be slidable in the axial direction thereof, and the clamp bar 16 is reciprocated in the directions of arrows A and B by a drive mechanism (not shown).

A tool clamp section 17 is formed at the rear end of the tool receiving section 9.

The tool clamp section 17 is connected to the tool 1 as shown in FIG.
When the chuck body 19 that has chucked the chuck body 8 is fitted into the tool receiving portion 9 of the main spindle 1, the rear end portion 20 of the chuck body 19
is held properly, and the fourth
As shown in the figure, when the chuck body 19 is pulled out from the tool receiving portion 9, the holding of the rear end portion 20 is released.

That is, when the clamp bar 16 moves in the direction of the arrow A, the ball 17a of the tool clamp part 17 moves from the large diameter hole 21 connected to the rear side of the tool receiving part 9 of the main shaft 1, as shown in FIG. Furthermore, it is fitted into the small diameter hole 22 on the rear side, displaced in the axial direction, and engaged with the stepped portion 2Qc between the shaft portion 20a and the collar portion 20b that constitute the rear end portion 20 of the chuck body 19. When the chuck body 19 is held properly and the clamp bar 16 is moved in the direction of arrow B, the ball 17a moves into the large diameter hole 21 and can protrude radially outward as shown in FIG. Then, the chuck body 19 can be disengaged from the stepped portion 20c, and by pulling out the chuck body 19 in the direction of arrow C, the chuck body 19 can be extracted from the tool receiving portion 9 of the main spindle 1.

The clamp bar 16 is provided with an air passage 23 provided in the radial direction and an air passage 24 formed in the axial direction and communicating with the air passage 23, and the air passage 24 opens into the tool clamp portion 17. In the tool clamp part 17, there is a spout 25 for spouting air into the tool receiving part s of the main spindle 1.
A nozzle 25 provided with a is housed so as to be freely axially movable.

The air passage 23 communicates with an annular passage 26 formed by the inner periphery of the internal hole 1a formed in the main shaft 1 and the outer periphery of the clamp bar 16, and this annular passage 26 is clearly defined in FIG. It communicates with the air passage 11a of the fixed position indexing stopper 11 formed on the outer periphery of the main shaft 1 through a passage 27 formed in the radial direction of the main shaft 1, and is open to the atmosphere.

That is, the air passages 23, 24 and the jet nozzle 25a in FIG.
A second air passage 31 is formed by the first annular passage 26 and the passage 27 shown in FIG. The upstream end formed on the contact surface is connected to the downstream end of the first air passage, and the downstream end provided with the spout 25a for cleaning the tool receiving portion 9 of the main spindle 1 is connected to the tool of the clamp bar 16. It opens at the tip end on the side of the receiving part 9 and communicates with the first air passage 28 in a series.

In the figure, 30 indicates a spring.

In the above configuration, the main spindle 1 is stopped at a quasi-reference position in the rotational direction by the indexing mechanism 6 at the end of machining the workpiece (see FIG. 5).

Subsequently, the spindle head 2 moves up to the tool exchange position, that is, the position shown in FIG. 1, using the column 4 as a guide.

Thereafter, the spindle position indexing cylinder 7 operates, and the positioning portion 7a presses the fixed position indexing stopper 11 formed on the outer periphery of the spindle 1, so that the spindle 1 is brought to a fixed position in the rotational direction as shown in FIG. The air passage 11a and the air passage 28 are brought into communication with each other.

Then, the clamp bar 16 moves in the direction of arrow B to reach the state shown in FIG. 4, and the chuck body 19 is extracted from the tool receiving portion 9 of the main spindle 1 by a tool extraction mechanism (not shown).

Therefore, the air supplied from the compressed air supply source passes from the supply pipe 29 through the first air passage 28 to the air passage 11a→
Machining passage 27→annular passage 26→air passage 23→air passage 24→air passage 24→sprayed from the second air passage 31 consisting of the spout 25a of the nozzle 25 onto the tapered inner circumferential surface 8 of the tool receiver 9, removing cutting powder and dust. Remove and clean properly.

In the above embodiment, the spindle position indexing cylinder 7 is disposed below the spindle 1 in the spindle head 2, and by pushing up from below, the positioning portion 7a abuts against the fixed position indexing stopper 11, and the spindle 1 is moved. Although we have described an example in which the rotation direction is stopped at a fixed position, as shown in FIG. 7a is provided,
The main shaft 1 may be configured to come into contact with a fixed position indexing stopper 11 formed on the outer periphery of the main shaft 1 to stop the main shaft 1 at a fixed position in the rotational direction.

As explained above, this invention releases air when the positioning part at the tip of the spindle position indexing cylinder that stops the spindle at a fixed position in the rotational direction comes into contact with the fixed position indexing stopper formed on the outer circumference of the spindle. Since the spindle is configured to be connected to the spindle, an air passage is not formed in the sliding contact portion between the spindle and the spindle head as in the conventional case, so air leakage does not occur.

Therefore, the tapered inner circumferential surface of the tool receiving portion can be properly cleaned at all times.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional side view of the spindle cleaning device according to this invention, Fig. 2 is a sectional view showing the state of contact between the fixed position indexing stopper and the main spindle position indexing cylinder tip positioning part, and Fig. 3 is the chuck. 4 is a sectional view showing the clamped state of the rear part of the body; FIG. 4 is a sectional view showing the unclamped state; FIG. 5 is a sectional view showing the main shaft stopped at a semi-reference position in the rotational direction by the indexing mechanism; 7 is a sectional view showing another embodiment of the contact state between the fixed position indexing stopper and the main shaft position indexing cylinder tip positioning part, and FIGS. 7 and 8 are a side view and a front view schematically showing the machining center. , FIG. 9 is an explanatory diagram of a conventional example. 1... Spindle, 2... Spindle head, 7.
...Spindle position indexing cylinder, 7a...Positioning part, 9...Tool receiving part, 11...
・Stopper for fixed position indexing, 16... Clamp bar, 17... Tool clamp part, 25a...
...Blowout port, 28...First air passage, 31.
...Second air passage.

Claims (1)

[Scope of utility model registration request] A spindle head, a spindle that is rotatably attached to the spindle head, has a tool receiving part at its axial tip, and a fixed position indexing stopper on the outer periphery of the spindle; A clamp bar is provided so as to be slidable in the axial direction and has a tool clamp section formed at the tip of the tool receiver side behind the tool receiver, and the tip contacts the stopper to determine the rotational direction of the main shaft. a main shaft position indexing cylinder, which is provided with a positioning part for stopping at the position and brings the positioning part into close contact with the stopper through the abutment; A first air passage that opens to a surface that comes into close contact with the stopper, and a first air passage that extends between the stopper, the main shaft, and the clamp bar, and which is connected to the positioning portion of the stopper in a state where the positioning portion is in close contact with the stopper. The upstream end formed on the contact surface is connected to the downstream end of the first air passage, and the downstream end provided with a spout for cleaning the tool receiving part of the main shaft is the tool receiving part side tip of the clamp bar. 1. A main shaft cleaning device for a machining center, comprising: a second air passage that is open in a continuous manner and communicates with the other air passages.