JPH09103932A - Device for supplying air to tool in machining head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool a spindle and the cutter part of a tool and to efficiently eliminate cut chips by forming an air flow passage in the spindle axial center of a machining head with a built-in motor so as to penetrate the same and ejecting compressed air to the cutter part of the tool from this air flow passage through an air flowing hole formed in the axial center of the tool. SOLUTION: Compressed air sent by pressure from a compressed air supply pipe 12 is supplied through an air ejecting pipe 11 to the air flow passage 7 of a spindle 5 and ejected from the lower end of this air flow passage 7, being passed through the air flowing hole 16 of a tool 15 and out of the lower end of the tool 15 to the outside. Cut chips produced by cutting performed by the tool 15 are eliminated to the outside direction by the compressed air ejected from the lower end of the tool 15 and the cutter part of the tool 15 is cooled. Also, the spindle 5 is cooled from the internal and external sides by air passed through the air flow passage 7 and a dust collection passage 14 and the durability of a bearing 6 for supporting this spindle is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air supply device for a tool in a machining head, which supplies air for dust removal and cooling to a tool mounted on a spindle of a machining head.

[0002]

2. Description of the Related Art As a conventional technique, a discharge pipe for discharging compressed air is attached to a side portion of a case of a machining head, and an outlet of the discharge pipe is directed to a blade portion of a tool attached to a spindle of a machining head, and the discharge pipe There is a device in which the chips generated in the blade portion of the tool are removed by the compressed air discharged from the pipe and the blade portion of the tool is cooled.

[0003]

In the above-mentioned prior art, since the discharge pipe is attached to the side portion of the case, the pipe is exposed at the peripheral portion of the processing head, which makes it difficult to attach the dust collecting cover. There is a drawback that the discharge pipe is separated from the blade portion and the chips cannot be efficiently removed.
The present invention forms an air flow passage through the shaft center of a spindle of a motor-incorporated machining head, and compresses the air flow path from this air flow path to the blade of the tool through an air passage hole opened in the shaft center of the tool. It is an object of the present invention to solve the above-mentioned drawbacks by discharging air, and to obtain an air supply device for a tool in a new machining head in which a spindle can be cooled.

[0004]

Means for Solving the Problems In order to achieve the above object, the present invention is configured as follows. That is, a machining head with a built-in motor is provided on a supporting member such as a column or a cross frame, an air passage is formed through the spindle of the machining head, and the air passage is formed on the spindle at one end of the spindle. A tool mounting hole that communicates with the flow path and fits with the shank of the tool is provided, the case of the machining head supports the air discharge pipe, and one end of the air discharge pipe is connected to the air flow path on the other end side of the spindle. A gap is maintained and fitted concentrically, the other end of the air discharge pipe is connected to a compressed air supply source, a tool having an air circulation hole is provided in the shaft center, and the shank portion of the tool is It is configured to be fitted and locked in the tool mounting hole of the spindle. In this case, an annular labyrinth groove is formed on the outer periphery of one end of the discharge pipe at a predetermined pitch in the axial direction, and one end of the discharge pipe is concentric with a small gap in the air passage on the other end of the spindle. It is preferable to fit the

[0005]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part thereof. In FIG. 1, reference numeral 1 is a machining head for a woodworking machine, and an upper and lower siler 2
Is supported by a holding member such as a column or a cross frame. In this machining head 1, a motor 4 is housed in an inverted manner in a cylindrical case (motor case) 3, and a tool 15 is attached to a lower end portion of a rotation shaft thereof, that is, a spindle 5 so as to project downward and be detachably attached. The spindle 5 is rotated by the motor 4 at about 20,000 revolutions per minute.

The spindle 5 has an axial center portion of the case 3 vertically extending therethrough, and upper and lower ends of the spindle 5 are rotatably supported on upper and lower walls of the case 3 by bearings 6. A small-diameter air passage 7 is formed through the shaft center of the spindle 5, and a taper-shaped tool mounting hole (not shown) having a large diameter downward is formed in the shaft center of the lower end of the spindle 5. The taper collet 8 that fits and holds the shank portion 15a of the tool 15 is fitted in the tool mounting hole, and the taper collet 8 is opened and closed by the cap 9 that is screw-fitted to the outer periphery of the lower end of the spindle 5. The upper end of the tool mounting hole is communicated with the air passage 7.

A top cover 10 surrounding the upper end of the spindle 5 is fixed to the upper end of the case 3, and an air discharge pipe 11 is attached to the top cover 10. This air discharge pipe 1
1 has a lower portion 11a protruding downward and a spindle 5
Is concentrically fitted to the upper part of the above, that is, the upper part of the air flow path 7, and a supply pipe 12 for supplying compressed air is connected to the upper end thereof. The supply pipe 12 is connected to a compressed air supply source such as an air pump. As shown in FIG. 2, for example, four annular labyrinth grooves 13 are formed on the outer circumference of the air discharge pipe 11 in the vertical direction at a predetermined pitch.

The above-mentioned tool 15 comprises a router bit having a cylindrical shank portion 15a on the upper portion and a spiral blade 15b on the outer periphery of the lower portion, and an air circulation hole 16 is formed through the axial center portion. Then, the shank portion 15a is fitted and fixed in the tool mounting hole of the spindle 5 via the above-described taper collet 8.

A dust collecting passage 14 is vertically formed through the outer circumference of the motor 4 of the case 3, and a cylindrical dust collecting case 17 and a funnel-shaped cover 19 are attached to the lower and upper outer circumferences of the case 3, respectively. Attaching an annular brush 18 surrounding the outer periphery of the tool 15 to the outer periphery of the lower end of the dust collection case 17,
The upper part of the cover 19 is connected to a suction duct (not shown). Reference numeral 20 denotes a stopper pin for locking the rotation of the spindle 5 by fitting the tip (the left end in FIG. 1) to the upper end of the spindle 5 from the orthogonal direction when the tool 15 is attached to and removed from the spindle 5. is there.

According to the above-described embodiment, the compressed air fed under pressure from the compressed air supply pipe 12 is supplied to the air passage 7 of the spindle 5 via the air discharge pipe 11, and from the lower end of the air passage 7. The tool 1 is passed through the air circulation hole 16 of the tool 15.
It is discharged from the lower end of 5. In this case, since the lower portion 11a of the air discharge pipe 11 is fitted in the air flow path 7 of the spindle 5 in a non-contact state, it does not wear even when the spindle 5 rotates at high speed. In addition, the air discharge pipe 11
The lower portion 11a of the above is fitted in the air flow path 7 with a small gap, and the labyrinth groove 13 is formed on the outer periphery thereof,
Compressed air is less likely to leak to the outside from the fitting portion of both.

The chips generated by cutting with the tool 15 are removed outward by the compressed air discharged from the lower end of the tool 15, and the blade portion of the tool 15 is cooled. In addition, the spindle 5 is the air flow path 7
The air flowing through the dust collecting passage 14 is cooled from the inside and outside, and the durability of the bearing 6 that supports the cooling is increased. The chips removed outward from the tool 15 are prevented from being scattered to the outside by the brush 18, and are suctioned and removed by the suction duct through the dust collection case 17, the dust collection passage 14, and the cover 19.

[0012]

As is apparent from the above description, according to the present invention, the compressed air is supplied from the shaft center of the spindle to the air flow passage provided in the shaft center of the tool. The piping is not exposed at the part, and the dust cover can be easily attached to the processing head. Moreover, since the compressed air is discharged from the vicinity of the blade through the shaft center of the spindle, the spindle and the blade of the tool can be efficiently cooled and chips can be efficiently removed. it can. Further, since the air discharge pipe is fitted in the air flow path of the spindle in a non-contact state, it can be applied to a spindle rotating at a high speed. Further, since the air discharge pipe is fitted in the air passage with a small gap and has the labyrinth groove on the outer periphery thereof, compressed air is less likely to leak to the outside from the fitting portion of both, and the compressed air is used as a tool. There is an effect such that it can be efficiently supplied toward.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part of FIG.

[Explanation of symbols]

 1 processing head 2 upper and lower silates 3 case 4 motor 5 spindle 6 bearing 7 air flow passage 8 taper collet 9 cap 10 top or bar 11 air discharge pipe 11a lower part 12 supply pipe 13 labyrinth groove 14 dust collection passage 15 tool 15a shank part 15b blade 16 Air flow passage 17 Dust collection case 18 Brush 19 Cover 20 Stopper pin

Claims (2)

[Claims] 1. A machining head having a built-in motor is provided on a support member such as a column or a cross frame, and an air passage is formed through the spindle of the machining head so that the spindle has an air passage at one end of the spindle. , A tool mounting hole communicating with the air flow path and into which a shank portion of the tool is fitted, the air discharge pipe is supported in the case of the machining head, and one end of the air discharge pipe is connected to the air flow on the other end side of the spindle. A small gap is held in the passage to be fitted concentrically, the other end of the air discharge pipe is connected to a compressed air supply source, and a tool having an air circulation hole in the shaft center portion is provided, and the shank of the tool is provided. An air supply device for a tool in a machining head, wherein a part is fitted and locked in a tool mounting hole of the spindle. 2. An annular labyrinth groove is formed on an outer periphery of one end of the discharge pipe at a predetermined pitch in the axial direction, and one end of the discharge pipe is provided with a small gap in an air flow path on the other end side of the spindle. The air supply device for the tool in the machining head according to claim 1, wherein the air supply device and the air supply device are concentrically fitted together.