JP3593758B2 - Cutting equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting device suitably used for performing a precision finishing process such as a honing process.
[0002]
[Prior art]
Honing is a process in which a cutting tool called a horn, in which a long and narrow whetstone with a rectangular cross section is attached to a radial holder, reciprocates in the axial direction at the same time as the rotational movement, precisely removing the inner surface of the hole previously drilled or reamed. Finishing work is widely used as finishing work for cylinders of internal combustion engines and hydraulic equipment.
[0003]
For this purpose, the honing machine attaches the horn to the main shaft and gives a rotary motion.However, in order to perform honing properly, it is essential that the horn be always inserted straight into the hole. It becomes.
[0004]
Conventionally, a horn is connected to the main shaft via a universal joint so that the horn can follow the hole without resistance even if the horn approaches the hole in a state that the horn is slightly positioned in the front, rear, right and left directions. , Only the rotational force and the axial force are applied so that it can be smoothly entered along the hole.
[0005]
[Problems to be solved by the invention]
By the way, another important condition of such honing is to supply a sufficient amount of cutting oil. Sufficient supply of the cutting oil has a great effect on reducing cutting heat, discharging chips, etc., and can greatly contribute to improving the machining accuracy of holes. However, conventionally, when a horn, which is a cutting tool, is inserted into a hole, cutting oil is supplied from outside, that is, from the mouth of the hole. For this reason, when the processing hole is deepened, the oil does not reach the inside of the hole, and as a result, there is a problem that the cutting oil amount and the pressure are insufficient and the processing accuracy of the hole is greatly reduced.
[0006]
The present invention has been made in view of such problems, and in various cutting processing fields such as honing, without impeding the proper support state of the cutting tool by a universal joint, through a hole through the cutting tool. It is an object of the present invention to provide a cutting device capable of directly supplying a sufficient amount of cutting oil to the inside of a cutting machine.
[0007]
[Means for Solving the Problems]
The present invention employs the following configuration in order to achieve the above object.
[0008]
That is, the cutting device according to the present invention is configured such that a cutting tool is connected to a rotating shaft via a universal joint, wherein an oil hole is provided at an axis of the cutting tool, and the oil hole is freely inserted at an inlet of the oil hole. Cutting oil is supplied from the rotating shaft side via a spiral tube wound around the outer periphery of the joint.
[0009]
With this configuration, even when the hole is honed, the cutting oil can be directly fed into the hole through the oil hole provided inside the horn with the horn inserted into the hole. Therefore, it is possible to supply a predetermined pressure and a required amount of oil to the inside of the hole irrespective of the depth of the hole. In addition, even with this configuration, since the tube connecting the rotating shaft side and the oil hole is spirally wound around the outer periphery of the universal joint, the external force applied to the universal joint from the tube cancels out in an 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 tube is unevenly distributed.
[0010]
Therefore, according to the cutting device of the present invention, even when performing deep hole drilling, it is possible to supply sufficient cutting oil to the cut portion without impairing the flexibility of a cutting tool such as a horn, and thereby drilling holes. An excellent effect that the accuracy can be drastically improved as compared with the related art is achieved.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0012]
The honing machine, which is a cutting device, is configured by attaching a horn 3 as a cutting tool to a honing machine main shaft 1 as a rotating shaft via a universal joint 2 as a universal joint.
[0013]
More specifically, the honing machine main shaft 1 is vertically suspended directly above the workpiece W, and is supported by a driving unit (not shown) so as to be axially movable and rotatable. A holder 4 is attached to the honing machine main shaft 1 at a lower end opening thereof by a screw 5 so as to be integrally rotatable.
[0014]
The universal joint 2 includes a first joint 6 and a second joint 7. The first joint portion 6 includes the holder 4, a cylindrical intermediate member 8 interposed between the holder 4 and the horn 3, and a pair of orthogonal members that connect the holder 4 and the intermediate member 8 to each other. And pins 9 and 10. The second joint part 7 includes the intermediate body 8, a shank 11 disposed below the intermediate body 8, and a pair of orthogonal pins 12 and 13 connecting the intermediate body 8 and the shank 11. Consists of
[0015]
That is, between the holder 4 and the intermediate member 8 and between the intermediate member 8 and the shank 11, the axial force and the rotational force can be effectively transmitted even if the respective shafts are eccentric or bent. Due to the synergistic effect of the joints 6 and 7, even if the shank 11 is displaced in a direction perpendicular to the axis with respect to the honing machine main shaft 1, the rotational force and the axial force of the honing machine main shaft 1 are effectively used. It can be transmitted to the shank 11. A disk member 14 is attached near the upper end of the shank 11 so as to be integrally rotatable. The mechanisms near these universal joints 2 are housed in a case 16. The case 16 is attached to the holder 4 with a screw 16a, and serves to protect the above-mentioned mechanisms and to regulate the range of movement of the horn 3 through the disk member 14.
[0016]
In the present embodiment, the horn 3 attached to the shank 11 is provided with an oil hole 3a extending along the axial center and opening at the upper end. The nozzle 3b extends downward. Then, the cutting oil is supplied to the inlet 3c of the oil hole 3a from the honing machine main shaft 1 side via the spiral tube 17.
[0017]
More specifically, a donut-shaped rotary joint 15 which is fitted to the holder 4 is disposed at a position in sliding contact with the lower end surface of the honing machine main shaft 1. And is 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 for opening the screw hole 15a in the entire inner circumference. On the other hand, the holder 4 communicates with a vertical hole 4a extending on the axis, a horizontal hole 4b communicating the vertical hole 4a with the inner peripheral groove 15b, and a screw hole 4c provided on the lower end surface of the holder 4. And a lateral hole 4d to be provided.
[0018]
On the other hand, the shank 11 is provided with a vertical hole 11a communicating with the inlet 3c of the oil hole 3a of the horn 3 at the horn mounting position in a liquid-tight manner, and a horizontal hole 11b communicating with the vertical hole 11a at the upper end of the shank. The disk member 14 has an annular groove 14a communicating with the lateral hole 11b, and a lateral hole 14c communicating the annular groove 14a with a screw hole 14b formed at the upper end of the disk member 14.
[0019]
Then, a spiral tube 17 made of a flexible material is wound around the outer periphery of the intermediate body 8 constituting the universal joint 2, and the upper end thereof is screwed into the screw hole 4c of the holder 4 via a connector 17a. The lower end is screwed into a screw hole 14b of the disk member 14 via a connector 17b.
[0020]
In such a configuration, when cutting oil is supplied from the screw hole 15a of the rotary joint 15, the cutting oil is first supplied to the vertical hole 4a of the holder 4 through the annular groove 15b and the horizontal hole 4b as shown by the arrow in FIG. After that, the spiral tube 17 is introduced into the spiral tube 17 via the lateral hole 4d, the screw hole 4c, and the connector 17a. After that, the cutting oil enters the screw hole 14b of the disk member 14 via the connector 17b, and further flows through the horizontal hole 11b and the vertical hole 11a of the shank 11 via the horizontal hole 14c and the annular groove 14a, as shown by arrows in FIG. Reaches the inlet 3c of the oil hole 3a of the horn 3. Then, it is ejected from the outside through the nozzle 3b.
[0021]
With such a configuration, even when the horn 3 is inserted into the hole a of the workpiece W shown in FIG. 1, an oil hole provided inside the horn 3 is provided inside the hole a. Cutting oil can be fed directly through 3a. Therefore, it becomes possible to supply a predetermined pressure and a required amount of oil to the inside of the hole a irrespective 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 circumference of the intermediate body 8 which is a component of the universal joint 2. In addition, the external force applied to the universal joint 2 from the tube 11 can be canceled in a circular integral manner. Therefore, compared to a case where the screw holes 4c and 14b are directly connected by a tube, for example, an external force does not act in a biased manner, and an appropriate degree of freedom in a direction perpendicular to the axis of the horn 3 can be ensured. It becomes possible.
[0022]
As described above, the honing machine serving as the cutting device according to the present embodiment can supply sufficient cutting oil to the cutting portion without impairing the flexibility of the horn 3 even when performing deep hole drilling. Thereby, an excellent effect that the processing accuracy of the hole a, specifically, the roundness, the cylindricity, and the like can be remarkably improved as compared with the related art is exerted. Further, since the horn 3 can be easily cleaned through the oil hole 3a, the effect of extending the life of the tool is also exerted.
[0023]
The specific configuration of each unit is not limited to only the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
[Brief description of the drawings]
FIG. 1 is an external view showing a main part according to an embodiment of the present invention.
FIG. 2 is a partial longitudinal sectional view of FIG.
FIG. 3 is another partial longitudinal sectional view of FIG. 1;
[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)

In a configuration in which a cutting tool is connected to a rotating shaft via a universal joint, an oil hole is provided in an axis of the cutting tool, and a spiral tube wound around the outer periphery of the universal joint is provided at an inlet of the oil hole. A cutting oil is supplied from a rotating shaft side via a rotary shaft.

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