JPH0994756A - Cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed a sufficient quantity of cutting oil to a cutting part so as to improve cutting precision for a hole by arranging an oil hole in a spindle center part of a cutting tool and feeding the cutting oil to an inlet of the oil hole from a rotary shaft side via a spiral tube in a cutting device in which the cutting tool is connected to the rotary shaft via a universal joint. SOLUTION: In a honing machine, a honing head serving as a cutting tool is installed in a tip part, of a shank 11 arranged below an intermediate body 8 of a universal joint 2 via the universal joint 2 in a spindle 1. In this case, a vertical hole 11a and a horizontal hole 11b are formed in the shank 11, and cutting oil fed to a rotary joint 15 is passed through a vertical hole 4a, a horizontal hole 4d, a spiral tube 17, and a horizontal hole 14c and a circular groove 14a in a disk member 14 so as to be jetted to the outside via a nozzle in the honing head. In this way, a required quantity of oil can be fed to the inside of a hole in a workpiece at the predetermined pressure, so that machining precision for a hole can be greatly improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device that is preferably used when performing precision finishing such as honing.

[0002]

2. Description of the Related Art Honing is a horn cutting tool in which a long and slender grindstone with a rectangular cross section is attached to a radial holder, and is reciprocally moved in the axial direction at the same time as the rotational movement.
This is a process for precisely finishing the inner surface of a hole previously drilled with a drill or reamer, and is widely used as finishing work for internal combustion engines and cylinders of hydraulic equipment.

A honing machine for that purpose attaches such a horn to a main shaft to give a rotary motion, but in order to properly perform the honing process, the horn should always be inserted straight into a hole. It becomes an indispensable condition.

Therefore, conventionally, a horn is connected to the main shaft through a universal joint, and even if the horn approaches the hole in a state in which it is positioned slightly to the front, rear, left, and right, the horn follows the hole without resistance. By applying only the rotating force and the axial force from the rotating shaft, it is possible to forcefully enter along the hole.

[0005]

By the way, another important condition for such honing is to supply sufficient cutting oil. Sufficient supply of cutting oil has a great effect on reduction of cutting heat, discharge of chips, and the like, and can greatly contribute to improvement of hole machining accuracy.
However, conventionally, when a horn, which is a cutting tool, is inserted into a hole, cutting oil is supplied from the outside, that is, from the mouth of the hole. For this reason, when the processed hole becomes deeper, oil will not reach the inside of the hole, and as a result,
The amount of cutting oil and the pressure are insufficient, which causes a problem that the machining accuracy of the hole is significantly reduced.

The present invention has been made in view of such a problem, and in various cutting processing fields including honing processing, cutting can be performed without disturbing an appropriate supporting state of a cutting tool by a universal joint. An object of the present invention is to provide a cutting device capable of directly supplying a sufficient amount of cutting oil to the inside of a hole through a tool.

[0007]

In order to achieve the above object, the present invention employs the following configuration.

That is, the cutting device according to the present invention has a structure in which a cutting tool is connected to a rotary shaft via a universal joint, and an oil hole is provided in the axial center portion of the cutting tool, and an inlet of the oil hole is provided. In addition, the cutting oil is supplied from the rotating shaft side through a spiral tube wound around the outer circumference of the universal joint.

According to this structure, even when honing a hole, cutting oil can be directly fed into the hole through an oil hole provided inside the horn in a state where the horn is inserted into the hole. Therefore, it is possible to supply a predetermined amount of oil and a required amount of oil to the inside of the hole regardless of the depth of the hole. Moreover, even with this configuration, since the tube that connects between the rotary shaft side and the oil hole is spirally wound around the outer circumference of the universal joint, the external force applied from the tube to the universal joint cancels out in a circular integral manner. As a result, the degree of freedom in the direction perpendicular to the axis of the horn is properly secured as compared with the case where the tubes are unevenly distributed.

Therefore, according to the cutting apparatus of the present invention,
Even when performing deep hole drilling, sufficient cutting oil can be supplied to the cutting location without compromising the flexibility of the cutting tool such as the horn, which dramatically improves the drilling accuracy compared to the past. There is an excellent effect that it can be done.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

This honing device, which is a cutting device,
A horn 3 which is a cutting tool via a universal joint 2 which is a universal joint to a honing machine spindle 1 which is a rotating shaft.
It is composed by attaching.

More specifically, the honing machine main shaft 1 is suspended vertically above the workpiece W and is axially movable and rotatably supported by a drive unit (not shown). This honing machine spindle 1 has a holder 4 at its lower end opening.
Is attached by a screw 5 so as to be integrally rotatable.

The universal joint 2 comprises a first joint portion 6 and a second joint portion 7. First joint part 6
Is composed of the holder 4, a cylindrical intermediate body 8 interposed between the holder 4 and the horn 3, and a pair of mutually orthogonal pins 9 and 10 connecting the holder 4 and the intermediate body 8. Composed. The second joint portion 7 includes the intermediate body 8 and
The shank 11 is disposed below the intermediate body 8 and a pair of pins 12 and 13 that connect the intermediate body 8 and the shank 11 and are orthogonal to each other.

That is, between the holder 4 and the intermediate body 8 and between the intermediate body 8 and the shank 11, even if the respective axes are eccentric or bent, the axial force and the rotational force can be effectively transmitted. It is possible, and these both joint parts 6, 7
Due to the synergistic effect of the shank 11, the honing machine spindle 1
On the other hand, the rotational force and the axial force of the honing machine main shaft 1 can be effectively transmitted to the shank 11 even if the honing machine main shaft 1 is deviated in the direction perpendicular to the axis. A disc member 14 is integrally rotatably attached near the upper end of the shank 11, and the mechanism near the universal joint 2 is housed in a case 16. The case 16 is attached to the holder 4 by means of a screw 16a and serves to protect the above-mentioned mechanisms and at the same time regulate the movement range of the horn 3 through the disc member 14.

In the present embodiment, however, the horn 3 attached to the shank 11 is provided with the oil hole 3a extending along the axial center portion and opening at the upper end, and the oil hole 3a is radiated from the intermittent position of the oil hole 3a. Nozzle 3 facing downward and diagonally
b is extended. Then, the inlet 3c of the oil hole 3a is supplied with cutting oil from the honing machine main shaft 1 side through the spiral tube 17.

More specifically, a donut-shaped rotary joint 15 which is fitted onto the holder 4 is disposed at a position where it comes into sliding contact with the lower end surface of the honing machine main shaft 1. The rotary joint 15 is a holder. 4 is slidable relative to 4, and is itself supported by a fixed portion of the honing machine at a position not shown. The rotary joint 15 is provided with a screw hole 15a to which a connector 15c for introducing cutting oil is connected, and an annular groove 15b which opens the screw hole 15a in the entire inner circumference. On the other hand, the holder 4 has a vertical hole 4a extending axially, a horizontal hole 4b for allowing the vertical hole 4a to communicate with the inner circumferential groove 15b, and a vertical hole 4a for communicating with a screw hole 4c provided on the lower end surface of the holder 4. A horizontal hole 4d is provided.

On the other hand, the shank 11 is provided with a vertical hole 11a which fluid-tightly communicates with the inlet 3c of the oil hole 3a of the horn 3 at the horn mounting position, and a horizontal hole 11b which communicates with the vertical hole 11a at the upper end of the shank. Further, the disk member 14 has an annular groove 14a communicating with the lateral hole 11b.
And a lateral hole 14c for communicating the annular groove 14a with a screw hole 14b opened at the upper end of the disk member 14.

Then, a spiral tube 17 made of a flexible material is wound around the outer circumference of the intermediate body 8 constituting the universal joint 2, and the upper end thereof is connected to the connector 1
It is screwed into the screw hole 4c of the holder 4 via 7a, and its lower end is screwed into the screw hole 14b of the disk member 14 via the connector 17b.

In such a structure, when the cutting oil is supplied from the screw hole 15a of the rotary joint 15, the cutting oil first flows in the annular groove 1 as shown by the arrow in FIG.
5b and the horizontal hole 4b into the vertical hole 4a of the holder 4,
Then, it is introduced into the spiral tube 17 through the lateral hole 4d, the screw hole 4c and the connector 17a. afterwards,
The cutting oil enters the screw hole 14b of the disk member 14 through the connector 17b, further flows through the horizontal hole 14c and the annular groove 14a, and then through the horizontal hole 11b and the vertical hole 11a of the shank 11,
As shown by the arrow in FIG. 3, the inlet 3c of the oil hole 3a of the horn 3
To reach. Then, it is ejected from here through the nozzle 3b.

With such a structure, even if the horn 3 is inserted into the hole a of the workpiece W shown in FIG. 1, the horn 3 is provided inside the hole a inside the horn 3. The cutting oil can be directly fed through the oil hole 3a.
Therefore, it is possible to supply a predetermined amount of oil and a required amount of oil to the inside of the hole a, regardless of the depth of the hole a. Moreover, even with such a configuration, the tube 11 connecting the honing machine main shaft 1 side and the oil hole 3 is spirally wound around the outer periphery of the intermediate body 8 which is a component of the universal joint 2. It is possible to cancel the external force applied from the tube 11 to the universal joint 2 in a circular integral manner. Therefore, for example, as compared with the case where the screw holes 4c and 14b are directly connected by a tube, the external force does not act unevenly, and an appropriate degree of freedom in the direction perpendicular to the axis of the horn 3 can be secured. It will be possible.

As described above, the honing machine, which is the cutting device of this embodiment, does not impair the flexibility of the horn 3 even when performing deep hole drilling and supplies sufficient cutting oil to the cutting location. As a result, it is possible to dramatically improve the processing accuracy of the hole a, specifically, the roundness, the cylindricity, etc., as compared with the conventional technique. Further, since the horn 3 can be easily washed through the oil hole 3a, the tool life can be extended.

The specific structure of each part is not limited to the above-described embodiment, but various modifications can be made without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is an external view showing a main part according to an embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view of FIG.

3 is another partial vertical cross-sectional view of FIG.

[Explanation of symbols]

 1 ... Rotary shaft (Honing machine main shaft) 2 ... Universal joint (Universal joint) 3 ... Cutting tool (horn) 3a ... Oil hole 3c ... Inlet 17 ... Spiral tube

Claims (1)

[Claims] 1. A structure in which a cutting tool is connected to a rotary shaft via a universal joint, wherein an oil hole is provided in an axial center portion of the cutting tool, and an oil hole is wound around an outer periphery of the universal joint at an inlet of the oil hole. A cutting device characterized in that cutting oil is supplied from the rotating shaft side through a spiral tube that has been turned.