JP2606416Y2 - Mounting structure of rotary tool for high pressure fluid - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a rotary tool, for example, a water jet nozzle or a drill, in which a high-pressure fluid circulation hole is formed in a shaft, to a rotary shaft such as a spindle.

[0002]

2. Description of the Related Art Conventionally, a drill chuck has been known as a tool for mounting a rotating tool having a flow hole through which a fluid such as water or oil passes through a shaft center on a rotating shaft. This conventional drill chuck is applied when the fluid is at a low pressure, and is not found to be applicable when the fluid is at a high pressure (500 kgf / cm2 or more).

[0003]

When the rotary tool is mounted on the rotary shaft, it is necessary to position the rotary tool so that the axis of the rotary tool exactly matches the predetermined position of the rotary shaft. . This is because if the axis of the rotary tool does not match the position determined with the axis of the rotary shaft as a reference, the rotary tool does not rotate at the predetermined position, making machining difficult.

When a high-pressure fluid is passed through a flow hole formed in the shaft center of the rotary tool, it is necessary to fasten the rotary tool so that the rotary tool does not protrude toward the tip due to the fluid pressure.
Further, it is necessary to provide a seal to prevent leakage of the high-pressure fluid.

The present invention has been made in view of the above points, and the rotating tool is operated by a simple operation such that the axis of the rotating tool coincides with a position determined with reference to the axis of the rotating shaft. It is an object of the present invention to provide a mounting structure for a high-pressure fluid rotating tool, which can accurately position the rotating tool and prevent the rotating tool from jumping out due to fluid pressure, and can prevent leakage of the high-pressure fluid.

[0006]

In order to solve the above-mentioned problems, in the mounting structure of the rotary tool for high-pressure fluid according to the first aspect of the present invention, a high-pressure fluid supply passage is formed in a shaft.
A holder is attached to the tip of the rotating shaft.
A tool insertion hole is formed from the tip surface to the back,
The back end of the tool insertion hole communicates with the supply flow path of the rotary shaft,
A rotary tool having a high-pressure fluid circulation hole formed therein;
It is inserted into the insertion hole, and the collet
The rotating tool is moved forward by tightening the collet
A collet chuck for fastening to the rotating shaft is provided.
In the rotating tool mounting structure, a stopper that abuts on the inner end face of the collet and regulates movement in the distal direction is screwed with a screw portion provided on the outer periphery of the rotating tool.
Thus, the outer peripheral surface of the rotary tool and the tool insertion hole are provided with a seal portion.

According to a second aspect of the present invention, in the mounting structure for a high-pressure fluid rotary tool according to the first aspect of the present invention, in the mounting structure for a high-pressure fluid rotary tool according to the first aspect, the rotary tool has an axis centered on the rotary shaft. An eccentric part for mounting eccentrically with respect to the axis is provided.

[0008]

In the mounting structure according to the first aspect of the present invention, the rotary tool is mounted on the rotary shaft via the holder. The rotating tool is inserted into a tool insertion hole formed in the holder, and is fastened by the collet chuck so that its axis coincides with the axis of the rotating shaft. Thus, since the collet chuck is provided, it is possible to easily attach and detach the rotary tool while positioning the rotary tool so that the axis of the rotary tool coincides with the axis of the rotary shaft.

The high-pressure fluid flows into the holder from a supply channel formed at the axis of the rotary shaft, and then flows into the flow hole of the rotary tool and is jetted from the tip. At this time, the pressure of the high-pressure fluid acts so as to cause the rotating tool to fly out toward the tip. The stopper protruding from the rotating tool comes into contact with the rear end face of the collet against the protrusion of the rotating tool, so that the movement of the rotating tool in the tip direction is restricted. Therefore, it is possible to prevent the rotating tool from jumping out with a simple structure.

[0010] The leakage of the high-pressure fluid can be prevented by a seal provided between the rotary tool and the tool insertion hole.

In the mounting structure according to the second aspect of the present invention, the rotary tool mounted on the rotary shaft via the holder is eccentric, so that the shaft center is mounted eccentrically with respect to the rotary shaft. For this reason, the rotating tool rotates with a predetermined amount of eccentricity due to the rotation of the rotating shaft.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG. 1 is a cross-sectional view showing a mounting structure according to the present embodiment. In FIG. 1, reference numeral 1 denotes a spindle.

The spindle 1 serves as a rotating shaft of a machine tool, and a high-pressure water supply passage 10 is formed at the axis thereof. The tip of the spindle 1 has a holder 2
The water jet nozzle 3 as a rotary tool is mounted on the spindle 1 via the holder 2.

The water jet nozzle 3 is a rod-shaped nozzle having a high-pressure water circulation hole 30 formed in the axis thereof. A collar 31 serving as a stopper is screwed to the water jet nozzle 3 at a position near the base end thereof. Further, the base end side from the collar 31 is formed to have a slightly smaller diameter, and an O-ring 33 and a backup ring 34 as seal members are provided on the outer periphery of the small-diameter portion 32. The water jet nozzle 3 is used, for example, for deburring the inside of a cut hole by injecting high-pressure water from an orifice 30a formed at the tip.

The holder 2 is disposed on the tip end surface of the spindle 1 so that its axis coincides with the axis of the spindle 1.
It is attached by bolts 4. The tool insertion hole 20 is formed in the holder 2 so that its axis coincides with the axis g of the spindle when the tool insertion hole 20 is attached to the spindle 1 from the distal end face toward the back.
0 is communicated with the supply flow path 10 of the spindle 1 through a communication hole 21. A tapered hole 20a is formed at the tip end of the tool insertion hole 20, and the tapered hole 20a
A large-diameter hole 20b is formed on the back side of the large-diameter hole 20b.
A small-diameter hole portion 20c is formed on the back side of b. The tool insertion hole 20, the communication hole 21, and the tapered hole 20a are
When the holder 2 is attached to the spindle 1, the axis of the holder 2 is formed to coincide with the axis g of the spindle.

A water jet nozzle 3 is inserted into the tool insertion hole 20. A collet chuck 22 for fastening the water jet nozzle 3 to a position where the axis of the water jet nozzle 3 coincides with the axis of the spindle 1 is provided on the holder 2.
Is provided at the tip of the camera. This collet chuck 22
Is a collet nut 22 screwed to the outer periphery of the tip of the holder 2.
a, and a collet 2 fitted in the tapered hole 20a.
2b. The collet 22b has a tightening portion 22c that coincides with the axis of the tapered hole portion 20a. When the collet nut 22a is rotated, the collet 22b moves in the tapered hole portion 20a in the axial direction while moving in the axial direction. Since the water jet nozzle 3 expands and contracts, the water jet nozzle 3 can be detachably fastened in a state where the water jet nozzle 3 is accurately aligned with the axis of the spindle 1.

The water jet nozzle 3 has a collar 31 serving as a stopper inserted into the tool insertion hole 20 in a state in which the collar 31 comes into contact with a rear end face of the collet 22b. Therefore, the movement of the water jet nozzle 3 in the tip direction is
It is regulated by the engagement between the collar 31 and the collet 22b.

The water jet nozzle 3 is inserted into the tool insertion hole 20 with the small diameter portion 32 fitted in the small diameter hole portion 20c. Therefore, the O provided on the small diameter portion 32
A seal portion 35 is formed between the small diameter hole portion 20c and the ring 33 and the backup ring 34. By fitting the small-diameter portion 32 into the small-diameter hole portion 20c as described above, the water jet nozzle 3 can be supported at two locations, that is, the fitting portion and the collet 22b. Positioning can be further ensured.

Next, the operation of the embodiment will be described. The water jet nozzle 3 as a rotating tool is mounted on the spindle 1 via a holder 2 mounted so that its axis coincides with the axis g of the spindle 1. In this case, the water jet nozzle 3 is inserted into a tool insertion hole 20 formed in the holder 2, and is fastened by the collet chuck 22 so that its axis coincides with the axis of the spindle 1. As described above, since the collet chuck 22 is provided,
The water jet nozzle 3 can be easily attached and detached while positioning the water jet nozzle 3 so that the axis of the water jet nozzle 3 and the axis of the spindle 1 coincide.

The high-pressure water flows into the holder 2 from the supply channel 10 formed in the axis of the spindle 1 and then flows into the flow hole 30 of the water jet nozzle 3 to be injected from the orifice 30a at the tip. Is done. At this time, the pressure of the high-pressure water acts to cause the water jet nozzle 3 to protrude toward the tip. In response to the protrusion, the collar 31 protruding from the water jet nozzle 3 comes into contact with the rear end face of the collet 22b, so that the movement of the water jet nozzle 3 in the distal direction is restricted. Therefore, it is possible to prevent the water jet nozzle 3 from jumping out with a simple structure.

In addition, the small-diameter portion 32
The high-pressure water can be prevented from leaking by the seal portion 35 between the small-diameter hole portion 20c and the small-diameter hole portion 20c.

Next, an embodiment according to claim 2 will be described with reference to FIG. In this embodiment, the collet 23b and the small-diameter portion 32 of the collet chuck 23 are attached to the tapered hole 20a of the holder 2 and the shaft centers g and t of the spindle 1 are set.
It is characterized in that the tightening portion 23c which is only eccentric is provided as the eccentric portion 24. Since other configurations are the same as those of the above-described embodiment, the same reference numerals are given and the description is omitted. In this case, when the water jet nozzle 3 is mounted on the tightening portion 23c, the rotation of the spindle causes
Since the water jet nozzle 3 is eccentric by t and rotates with its radius as a radius, if an orifice is provided in the outer periphery, processing can be performed at a position very close even if the diameter of the water jet nozzle is smaller than the diameter of the processing hole. . In this case, as shown in FIG. 2, by oscillating the water jet nozzle in a part of the range, it is possible to efficiently process an arc-shaped notch without damaging other parts. Conversely, if an orifice is provided in the inner circumference, the orifice can be rotated at a position as far as possible from the processing site depending on the material of the work or the like.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to this embodiment. For example, in the embodiment, a water jet nozzle is taken as an example of a rotary tool, but the present invention can be applied to a drill and the like.
In addition, the holder can be attached to the rotating shaft in addition to the bolting of the embodiment, and the holder can be screwed into the rotating shaft for attachment, or the stopper can be formed integrally with the rotating tool. Good.

As shown in FIG. 3, the water jet nozzle 3 may be eccentrically rotated by eccentricizing the axis of the holder 2 with respect to the axis of the spindle 1.

[0025]

As described above, in the mounting structure of the rotary tool for high-pressure fluid according to the first aspect of the present invention, since the collet chuck is provided, the rotary tool can be operated by a simple operation.
Positioning can be performed so that the axis coincides with the axis of the spindle, and the attachment and detachment can be performed easily. Further, since the rotary tool is provided with the stopper, it is possible to prevent the rotary tool from jumping out due to the fluid pressure and to prevent leakage of the high-pressure fluid by the seal portion.

Further, in the mounting structure of the rotary tool for high-pressure fluid according to the second aspect, the size and shape of the processed portion of the work,
The effect is obtained that appropriate processing can be performed depending on the material and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mounting structure according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a mounting structure according to an embodiment of the present invention;

FIG. 3 is a sectional view showing a mounting structure of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle (rotating shaft) 10 Supply flow path 2 Holder 20 Tool insertion hole 21 Communication hole 22, 23 Collet chuck 22a Collet nut 22b, 23b Collet 23c Tightening part 24 Eccentric part 3 Water jet nozzle (rotary tool) 30 Flow hole 31 Collar (stopper) 35 Seal part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B26F 3/00 B05B 15/06 B24C 5/04

Claims (2)

(57) [Scope of request for utility model registration] A high-pressure fluid supply passage is formed in a shaft.
The holder is attached to the tip of the rotating shaft
The tool insertion hole is formed from the tip
Of the tool insertion hole communicates with the supply flow path of the rotary shaft.
A rotating tool with a high-pressure fluid flow hole formed in the shaft
The tool is inserted into the tool insertion hole.
Tighten the collet with a nut to
A collet chuck for fastening a tool to the rotating shaft is provided.
In the rotating tool mounting structure, a stopper is provided on the outer periphery of the rotating tool, the stopper being in contact with the inner end face of the collet and restricting movement in the distal direction.
A high-pressure fluid characterized by being provided with a sealing portion between the outer periphery of the rotary tool and a tool insertion hole by being screwed in the axial direction by screwing with the threaded portion. Mounting structure for rotary tools 2. The mounting structure for a high-pressure fluid rotary tool according to claim 1, further comprising an eccentric portion for mounting the rotary tool with its axis being eccentric with respect to the axis of the rotary shaft. Mounting structure for high-pressure fluid rotary tools.