JPH06143087A - Chip suction type rotary cutting tool - Google Patents

Abstract

PURPOSE:To provide a chip suck-in type rotary cutting tool which eliminates a need for adjusting the amount of projection of a cover in the direction of a tool axial line, and concurrently can enhance a chip suck-in rate. CONSTITUTION:A chip cuck-in type rotary cutting tool is so constituted that a cutting blade tip 50 is installed at the outer circumferential section of the tip end of a tool main body rotated around an axial line, and a tool main body is provided with a cover 46 which covers the outside of the circumferential surface of the tool main body, and forms a chip housing room 74 opened to the tip end side of the tool, in such a way that the cover is freely rotatable around the tool axial line, and the cover 46 comprises a suck-in port 78 formed, which communicates the chip housing room 44 with the outside of the cover 46. Moreover, an exhaust nozzle 86 is formed to be opened at the side of the tip end section of the cover 46 while being faced to the tip end side of the tool across the whole of the circumferential direction, and concurrently a blow-in port 88 communicating the inside of the exhaust nozzle 86 with the outer side of the cover 46 is formed at the side of the tip end section of the cover 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip suction type rolling cutting tool capable of performing plane cutting of a work material while sucking chips, and more specifically, it improves a suction rate of generated chips. The present invention relates to an improvement of a chip suction structure that can be performed.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show an example of a conventional chip suction type rolling cutting tool. The chip suction type rolling cutting tool shown in these figures has a substantially cylindrical shape, and has a tool body 2 whose tip side is expanded, and a chip which covers the outside of the peripheral surface of the tool body 2 and opens to the tool tip side. And a cover 4 that defines a storage chamber (space) 5.

A plurality of throw-away tips (cutting edge tips) 8 are mounted on the outer peripheral portion of the tool body 2 on the tip end side at equal intervals in the circumferential direction by a wedge member 6 tightened by a clamp screw (not shown). A chip pocket 10 formed in correspondence with each throw-away tip (hereinafter abbreviated as “chip”) 8 and having an arcuate shape when viewed in the axial direction has a chip disposed at the tip of the tool body 2. Each tip portion 12a of the guide member 12 is provided with a slight gap from the rake face of the tip 8. A center hole 14 is formed in the center of the tool body 2 so as to penetrate the tool body 2 in the axial direction. The fitting shaft 18 of the arbor 16 is fitted into the center hole 14 and then tightened. Both are integrally fixed by a bolt 20. Arbor 16 is key 22
It is fixed to the spindle 24 of the machine tool via.

The cover 4 includes a support cover 28 fitted outside the radial bearing 26 fitted to the arbor 16, and a movable cover provided inside the support cover 28 so as to be slidable in the axial direction of the tool. 30 and is rotatable with respect to the tool body 2 around the tool axis. As shown in FIG. 5, a long hole 32 is formed in the support cover 28, and the movable cover 30 is slidable with respect to the support cover 28 by a bolt 34 inserted into the long hole 32 and screwed into the movable cover 30. It is fixed to. A suction port 36 that communicates the chip storage chamber 5 with the outside of the cover 4 is formed on the side of the cover 4, and a suction hose 40 connected to a suction device (not shown) is formed in the suction port 36. One end is connected via a discharge pipe 38.

In the above chip suction type cutting tool, after the cover 4 is positioned and fixed in the circumferential direction, the chip storage chamber 5 is provided.
The tool body 2 is rotated by the main shaft 24 while sucking the air in the suction port 36, and the cutting edge of the tip 8 provided so as to project outward in the axial direction and the radial direction causes the flat machining of the work material. To go. The chips successively generated by the cutting edge of the tip 8 are guided to the chip guide member 12 and sucked into the chip storage chamber 5 as shown in FIG. 6, and further transferred to the suction machine side through the suction port 36. , Will be collected. Note that FIG.
In the figure, the chip guide member 12 is shown in a simplified manner.

[0006]

By the way, in the chip suction type rolling cutting tool as described above, the tip of the cutting blade and the tip of the movable cover 30 in the axial direction of the tool are set in accordance with the cutting conditions (mainly the amount of cutting). In order to keep the distance L1 (see FIG. 6) within a predetermined range, the support cover 28 is provided each time.
It is necessary to adjust the protrusion amount of the movable cover 30 with respect to. That is, when the distance L1 is smaller than the cut amount L2 (FIG. 6), the tip of the movable cover 30 contacts the work material, and when the distance L1 is too large, the work material and the movable cover 30 are separated. The gap with the tip becomes too large, and the suction rate decreases. Therefore, in the conventional chip suction type rolling cutting tool, it is necessary to accurately adjust the protruding amount of the movable cover 30 each time, and this work is troublesome, and there has been a demand for improvement. .

The present invention has been made in view of the above circumstances, and eliminates the work of adjusting the protrusion amount of the cover in the axial direction of the tool, and at the same time, the chip suction type rolling device capable of increasing the chip suction rate. The purpose is to provide a cutting tool.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a cutting blade tip is attached to the outer periphery of the tip of a tool body that is rotated around an axis, and the tool body is provided with an outer peripheral surface of the tool body. A cover that defines a chip storage chamber that opens to the tip side is provided rotatably around the tool axis, and a suction port that connects the chip storage chamber and the outside of the cover is formed in the cover. In the type rolling tool, a jet port that opens toward the tool tip side over the entire circumferential direction is formed in the tip side portion of the cover, and the inside of the jet port and the outside of the cover are formed in the cover. It is characterized in that a communicating air inlet is formed.

[0009]

In the chip suction type rolling tool having the above structure, the cover is positioned and fixed in the circumferential direction, the air in the chip storage chamber is sucked from the suction port, and the compressed air is blown from the blow port. Insert and eject from the ejection port toward the tool tip side, in this state rotate the tool body around the axis,
With the cutting edge tip attached to the tool body, the work material is sequentially plane-cut.

During cutting, the compressed air ejected from the ejection port abuts the surface of the work material while surrounding the entire circumference of the cover, and the compressed air flows between the tip of the cover and the surface of the work material. To form a barrier layer. Then, all or most of the flow of compressed air contacting the surface of the work material is attracted and merged with the flow of suction air from the vicinity of the tip of the tool body toward the chip suction chamber, and then from the suction port to the outside of the cover. It is sucked.

Therefore, the chips generated by the cutting blade tip are prevented from scattering to the outside of the cover by the blocking layer, and at the same time, due to the flow of compressed air toward the chip storage chamber, the chips are directed toward the chip storage chamber. The movement is further promoted, which significantly improves the chip suction rate.

Further, since the blocking layer is formed between the tip of the cover and the surface of the work material, the distance between the tip of the cutting edge and the tip of the cover in the tool axis direction is defined as the maximum cutting amount used during cutting. By setting a larger value with a margin, the cover will not come into contact with the work piece, and the gap between the work piece and the tip of the cover will increase, reducing the suction rate. It doesn't get lost. Therefore, the work of adjusting the protrusion amount of the cover in the tool axis direction becomes unnecessary.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an axial sectional view showing a chip suction type rolling tool according to an embodiment of the present invention, and FIG. 2 is a bottom view of the chip suction type rolling tool.

The chip suction type cutting tool shown in these figures is
The basic configuration except the structure of the tip side portion of the cover, which will be described later, is the same as that shown in FIGS. 3 to 6 described above, and has a substantially cylindrical shape, and the tip side of the tool body 42 has an enlarged diameter. A cover 46 that covers the outside of the peripheral surface of the tool main body 42 and defines a chip storage chamber 44 that opens toward the tool tip side.

A wedge member 4 is provided on the outer peripheral portion of the tool body 2 on the tip side.
A plurality of chips 50 fixed by 8 are mounted at equal intervals in the circumferential direction, and a chip guide member 54 is provided in a chip pocket 52 formed corresponding to each chip 50.
It is mounted and fixed by 6. A central hole 58 is formed in the center of the tool body 42 so as to penetrate the tool body 42 in the axial direction.
And the fitting shaft 62 of the arbor 60 is formed in the center hole 58.
After being fitted, the tightening bolt 66 is tightened via the stepped sleeve 64 to integrally fix the two.
The arbor 60 is fixed to the spindle of the machine tool through the key inserted into the key groove portion 68, similarly to the above-described chip suction type rolling cutting tool.

The cover 46 is provided with a support cover 74 fitted to the outside of the radial bearings 70 and 72 fitted to the arbor 60, and inside the support cover 74 so as to be slidable in the tool axis direction. It is composed of a movable cover 76 and is rotatable about the tool axis with respect to the tool main body 42. A long hole 80 extending in the tool axis direction is formed in the support cover 74.
The movable cover 76 is slidably fixed to the support cover 74 by a bolt 82 inserted into the movable cover 76 and screwed into the movable cover 76. Also, on the side of the cover 46,
Suction port 7 that connects the chip storage chamber 44 and the outside of the cover 46
8 is formed, and one end of a suction hose 84 connected to a suction device (not shown) is connected to the suction port 78.

The structure of the tip side portion of the cover 46, which is a feature of this embodiment, is as follows. A jet port 86 that opens toward the tool tip side is formed at the tip of the movable cover 76 over the entire circumferential direction. Further, in the axial cross section shown in FIG. 1, the angle θ1 formed by the extending direction of the ejection port 86 with respect to the tool axis is set to 15 ° or more and 60 ° or less. When θ1 is less than 15 °, the compressed air is blown out from the jet outlet 86, so that the chip suction effect described later cannot be sufficiently obtained, and when it is more than 60 °, the outer diameter of the cover 46 is more than necessary. And the chip suction efficiency decreases.

At the side of the tip of the movable cover 76, a blow-in port 88 is formed which connects the inside of the jet outlet 86 and the outside of the movable cover 76. The other end of the tube 90, one end of which is connected to a compressed air supply unit such as a compressor (not shown), is connected to the air inlet 88.

In the chip suction type cutting tool having the above structure, the arbor 60 is mounted on the main shaft of the machine tool, and the cover 4 is attached.
After positioning and fixing 6 in the circumferential direction, the chip storage chamber 44
The air inside is sucked from the suction port 78, and
Compressed air is blown in from 8 and ejected from the ejection port 86 toward the tool tip side. Then, in this state, the tool body 42
Is rotated around the axis, and the chip 50 mounted on the tool main body 42 sequentially performs the planar cutting of the work material.

At the time of cutting, the compressed air ejected from the ejection port 86 abuts on the surface of the work material while surrounding the entire circumferential direction of the cover 46, and between the tip portion of the cover 46 and the surface of the work material. A barrier layer is formed by the flow of compressed air. Then, all or most of the flow of the compressed air contacting the surface of the work material is attracted and merged with the flow of the suction air from the vicinity of the tip of the tool body 42 toward the chip suction chamber 44,
It is sucked from the suction port 78 to the outside of the cover 46.

Therefore, the chips generated by the tip 50 are prevented from scattering to the outside of the cover 46 by the blocking layer of the compressed air flow, and at the same time, the flow of the compressed air toward the chip storage chamber 44 causes the chips to be stored. The movement towards the chamber 44 is further promoted, which significantly improves the chip suction rate. That is, the compressed air ejected from the ejection port 86 not only prevents the scattering of chips, but also serves to remarkably enhance the efficiency of chip recovery due to the synergistic effect with the suction air flow generated from the suction port. It also has the effect of enhancing the cooling effect of the cutting edge and extends the life of the tip 50.

Further, since the blocking layer is formed between the tip of the cover 46 and the surface of the work material, it is not necessary to adjust the protruding amount of the movable cover 76 in the tool axis direction. That is, if the distance between the tip of the cutting blade in the tool axis direction and the tip of the movable cover 76 is set to a value that is larger than the maximum cutting amount used during cutting and has a margin, the cover 46 is a work material. It does not abut, and the chip suction rate does not decrease because the gap between the work material and the tip of the cover 46 increases. Therefore, basically, the movable cover 76 may not be provided (the ejection port is formed at the tip end side portion of the support cover). However, when a sufficient compressed air flow cannot be obtained, the position of the movable cover 76 may be supplementarily adjusted to some extent (it is not necessary to be accurate as in the conventional case).

[0023]

As described above, according to the chip suction type rolling cutting tool according to the present invention, the work for adjusting the protrusion amount of the cover in the tool axial direction is not required and the work efficiency is improved and the chip suction The rate can be significantly improved.

[Brief description of drawings]

FIG. 1 is an axial sectional view showing a chip suction type rolling tool according to an embodiment of the present invention.

FIG. 2 is a bottom view of the chip suction type cutting tool.

FIG. 3 is an axial sectional view showing a conventional chip suction type rolling tool.

4 is a bottom view of the chip suction type cutting tool of FIG. 3. FIG.

5 is a view from the direction V of the chip suction type cutting tool of FIG.

FIG. 6 is a diagram for explaining the position adjustment of the movable cover.

[Explanation of symbols]

 42 Tool Main Body 44 Chip Storage Chamber 46 Cover 50 Cutting Blade Tip 78 Suction Port 86 Jet Outlet 88 Inlet

Claims (1)

[Claims] 1. A chip storage chamber in which a cutting blade tip is attached to a tip outer peripheral portion of a tool body rotated about an axis, and the tool body is provided with an outer peripheral surface of the tool body and is open to a tool tip side. In the chip suction type rolling tool, the cover defining the above is provided rotatably around a tool axis, and the cover has a suction port that communicates the chip storage chamber with the outside of the cover. A jet opening that is open toward the tool tip side over the entire circumferential direction is formed at the tip side portion of the, and a blow opening that communicates the inside of the jet opening with the outside of the cover is formed in the cover. A chip suction type cutting tool characterized by this.