JPH07171734A - Coolant feeding device for machine tool - Google Patents

Abstract

PURPOSE:To provide a coolant feeding device capable of surely allowing the coolant to reach the working point of a cutter. CONSTITUTION:A cutter 8 is mounted on a spindle 5 through upper and lower flanges 2, 3. The coolant is fed from a plurality of radial holes 7 to the front surface side. A plurality of guide grooves 11 are formed continuous to each hole in a guide member 10 of the lower flange to communicate the opening of the hole to the front end surface of the guide member. The guide grooves 11 are radially arranged relative to the spindle 5, and inclined to the radial direction of the spindle. A circumferential groove 12 continuous to the outer side of the outer end part of the guide groove 11 is provided in the front end surface of the guide member 10. The guide groove and the adjacent inner end edge 13 form an acute angle. The coolant passes through the radially-arranged holes and the guide groove 11, and is rotated together with the spindle 5 to obtain the full speed in the rotational direction, and is released from the end edge of the circumferential groove 12 by the inertia force to reach the cutter. Because the end edge of the groove is of acute angle, the coolant reaches the end surface of the mounting flange by the viscosity to reduce the amount of the coolant to be scattered from the cutter space to the circumference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coolant supply device for a machine tool that supplies coolant to a spindle of the machine tool.

[0002]

2. Description of the Related Art FIG. 2 shows a coolant supply device in a conventional machine tool. A spindle 101 of a spindle head 100 of a machine tool is provided with a mounting flange 104 including an upper flange 102 and a lower flange 103. On the rear surface (upper surface in the figure) of the upper flange 102 attached to the main shaft 101, a circumferential supply groove 105 for supplying the coolant is formed. In addition, the upper flange 102 communicates with the supply groove 105 and has a plurality of holes 10.
6 are formed radially. Each of these holes 106
The upper flange 102 is opened at the front surface (lower surface in the figure). The front surface (lower surface in the figure) of the lower flange 103 connected to the upper flange 102 is a tapered surface 107, and the blade 1 attached to this lower flange 103
08 projects downward from the end surface of the lower flange 103.

When the main shaft 101 is rotationally driven, the coolant supplied to the supply groove 105 of the upper flange 102 passes through each hole 106, and at that time, it is rotated together with the main shaft 101 to obtain a speed in the rotational direction. After that, the coolant that has passed through the holes 106 is scattered by the centrifugal force in the radial direction of the main shaft 101 and reaches the vicinity of the blade 108 via the tapered surface 107 of the lower flange 103.

[0004]

Since the radial holes 106 for guiding the coolant are short, the speed of the coolant in the main shaft rotation direction is not sufficiently given to the coolant when passing through these holes 106. Therefore, the coolant that has come out of the hole 106 is unlikely to reach the blade 108.

Further, the coolant that has come out of the hole 106 is transmitted to the end surface of the lower flange 103 via the tapered surface 107 of the lower flange 103 and then scattered. Therefore, most of the coolant comes out from between the blades 108, and only slightly reaches the processing point at the tip of the blades 108.

An object of the present invention is to provide a coolant supply device capable of reliably reaching the machining point of a cutting tool.

[0007]

A coolant supply device for a machine tool according to a first aspect of the present invention is provided in a machine tool in which a cutting tool is attached to a front side of a mounting flange attached to a spindle, and the front side of the flange is provided. In a coolant supply device of a machine tool for supplying coolant to the blade from a plurality of radial holes opened to the front surface of the flange, a plurality of holes for opening the front surface of the flange and the blade are communicated with each other. A coolant guide path is provided on the front surface of the flange.

A coolant supplying device for a machine tool according to a second aspect is the coolant supplying device for a machine tool according to the first aspect, wherein the inside of the coolant supplying device is outside the outer end of each of the guide paths. Is provided with a circumferential groove having an acute edge.

[0009]

The coolant passes through the radial holes and the guide path formed continuously with the radial holes, and rotates with the main shaft in the meantime to obtain a sufficient rotational speed. And the coolant is
It is released by inertial force from the edge of the circumferential groove and reaches the blade. Since the edge of the groove is an acute angle, the amount of the coolant that wraps around the end surface of the mounting flange due to viscosity and is scattered around between the blades is small.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A coolant supply device for a machine tool in a first embodiment will be described with reference to FIG. Machine tool spindle head 1
In, a mounting flange 4 including an upper flange 2 and a lower flange 3 is provided on the main shaft 5. Spindle 5
On the rear surface (upper surface in the figure) of the upper flange 2 attached to the, a circumferential supply groove 6 for supplying the coolant is formed. Further, a plurality of holes 7 communicating with the supply groove 6 are radially formed in the upper flange 2 toward the front. Each of these holes 7 is opened on the front surface (the lower surface in the figure) of the upper flange 2.

An annular lower flange 3 is attached to the outer periphery of the upper flange 2. A blade 8 is attached to the outer periphery of the lower flange 3, and the tip of the blade 8 projects forward from the end surface of the attachment flange 4.

The front surface (lower surface in the figure) of the lower flange 3 is a concave tapered surface 9, and an annular guide member 10 is attached to the tapered surface 9. Guide member 10
A plurality of guide grooves 11 are continuously formed in each of the holes 7 on the front surface of the hole as a coolant guide path continuing to the holes 7. The guide groove 11 connects the opening of each hole 7 and the front end surface of the guide member 10.

As shown in FIG. 1 (b), each of the guide grooves 1
1 are arranged radially with respect to the main shaft 5, and are further inclined in a predetermined direction with respect to the radial direction of the main shaft 5. The direction of the inclination is such that the outer end of each guide groove 11 corresponds to the direction of rotation of the main shaft 5 indicated by the arrow in FIG.
It is set so as to come to the delay side from the inner end of 1.

On the front end face of the guide member 10, a continuous circumferential groove 12 is provided outside the outer end of each guide groove 11.
Is provided. As shown in FIG. 1, the cross-sectional shape of the groove 12 is triangular, and the inner edge adjacent to the guide groove 11 constitutes an edge 13 having an acute angle.

In the above structure, the spindle 5 of the machine tool is driven to rotate and the coolant is supplied to the spindle 5. Supply groove 6 from the rear surface side of the mounting flange 4 of the main shaft 5
The coolant supplied to passes through a plurality of radial holes 7 and further passes through a guide groove 11 continuous with each hole 7.

While the coolant is passing through the radial holes 7 and the guide groove 11 formed continuously with the holes 7, the coolant flows through the main shaft 5
Rotate with it to get sufficient velocity in the direction of rotation. The length of the continuous hole 7 and the guide groove 11 is sufficient to give the coolant sufficient speed in the rotational direction. In this embodiment, since the guide groove 11 is further inclined with respect to the radial direction of the main shaft 5,
The coolant gets the speed in the direction of rotation more efficiently.

The coolant having a sufficient speed in the rotating direction is discharged from the guide groove 11 by an inertial force and reaches the lower portion of the blade 8 and the workpiece 14. The coolant cools and cleans these, suppresses the temperature rise of the workpiece 14 to improve the machining accuracy, and prolongs the life of the blade 8.

In this embodiment, the groove 1 surrounding the guide groove 11
Since the second end edge 13 has an acute angle, the coolant is prevented from passing over the end edge 13 and being transmitted to the end surface 10a of the guide member 10 due to viscosity. Therefore, the amount of coolant scattered from between the blades 8 is reduced.

According to this embodiment, the temperature rise of the workpiece 14 is suppressed, the processing accuracy is improved, and the defective rate is reduced.
Further, since the material of the blade 8 can be changed to a hard one, the wear of the blade 8 is reduced, and the blade cost and the processing time can be reduced. Furthermore, due to the reduction of blade wear, the frequency of blade exchanges is reduced and the machine utilization rate is improved.

[0020]

According to the coolant supply device for a machine tool of the present invention, the coolant supplied from the plurality of holes formed in the mounting flange of the main shaft is further guided by the guide path continuous to each hole, and is sufficiently The rotation speed is given to ensure that the blade reaches the blade. Therefore, the blade and the workpiece are sufficiently cooled and washed, the temperature rise of the workpiece is suppressed, the processing accuracy is improved, and the life of the blade is extended.

[Brief description of drawings]

1A is a partial cross-sectional view of an embodiment of the present invention, and FIG. 1B is a bottom view of the same.

2A is a partial cross-sectional view of a spindle head of a machine tool having a conventional coolant supply device, and FIG. 2B is a bottom view of the same.

[Explanation of symbols]

 4 Mounting Flange 5 Spindle 7 Radial Hole 8 Blade 11 Guide Groove as Guide Path 12 Circular Groove 13 Sharp Edge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsunosuke Ozawa 629 Oshiba, Mobara-shi, Chiba Futaba Electronics Co., Ltd.

Claims (2)

[Claims] 1. A machine tool having a cutting tool mounted on the front side of a mounting flange mounted on a spindle.
In a coolant supply device of a machine tool for supplying a coolant to the blade through a front surface of the flange from a plurality of radial holes opened on a front surface of the flange, the holes and the blade opened on the front surface of the flange. A coolant supply device for a machine tool, characterized in that guide paths for a plurality of coolants to be communicated are provided on the front surface of the flange. 2. Outside the outer end of each of the guide paths,
2. The coolant supply device for a machine tool according to claim 1, further comprising a circumferential groove having an acute inner edge.