JP2861688B2 - Milling tool with chip discharge mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip discharging mechanism capable of performing plane cutting of a work material while guiding and collecting chips.
Relates milling tool attached and, more specifically, relates to an improvement of the chip collecting structure capable of improving the recovery rate of the generated chips.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show an example of a conventional chip suction type milling tool. The chip suction-type milling tool shown in these figures has a substantially cylindrical shape, and has a tool body 2 whose tip side is enlarged in diameter, and a chip that covers the outer peripheral surface of the tool body 2 and opens to the tool tip side. And a cover 4 that defines a storage room (space) 5.

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

The cover 4 has a support cover 28 fitted outside a radial bearing 26 fitted on the arbor 16, and a movable cover provided inside the support cover 28 so as to be slidable in the tool axis direction. And relative rotation about the tool axis with respect to the tool body 2.
It is possible . As shown in FIG. 6, the support cover 28 has an elongated hole 32 formed therein. The movable cover 30 can be slid with respect to the support cover 28 by a bolt 34 inserted into the elongated hole 32 and screwed to the movable cover 30. It is fixed to. A chip storage room 5 is provided beside the cover 4.
A suction port 36 is formed which communicates with the outside of the cover 4. One end of a suction hose 40 connected to a suction machine (not shown) is connected to the suction port 36 via a discharge pipe 38. .

In the above-mentioned chip suction type milling tool, the chip storage chamber 5 is fixed after the cover 4 is positioned and fixed in the circumferential direction.
The tool body 2 is rotated by the main shaft 24 while sucking the air inside from the suction port 36, and the work material is flattened by the cutting edge of the tip 8 protruding outward in the axial direction and radially outward. go. Chips successively generated by the cutting blades of the chips 8 are guided to the chip guide member 12 and sucked into the chip storage chamber 5 as shown in FIG. 7, and further transferred to the suction machine side through the suction port 36. , Will be collected. FIG. 7 shows the chip guide member 12 in a simplified manner.

In the above-mentioned chip suction type milling tool, the distance L1 (FIG. 7) between the tip of the cutting blade and the tip of the movable cover 30 in the tool axis direction depends on the cutting conditions (mainly the cutting depth). Each time the movable cover 30 protrudes from the support cover 28, it is necessary to adjust the protrusion amount of the movable cover 30 so that the movable cover 30 is within a predetermined range. That is, if the distance L1 is smaller than the cut amount L2 (FIG. 7), the tip of the movable cover 30 comes into contact with the work material, and the distance L1
Is too large, the gap between the work material and the tip of the movable cover 30 becomes too large, and the suction rate decreases.
Therefore, in the conventional chip suction type milling tool, it is necessary to accurately adjust the amount of protrusion of the movable cover 30 each time, and this work is troublesome, and there has been a demand for improvement. .

[0007] The present invention further provides a chip suction type milling tool.
The tip of the cover is changed according to the cutting conditions.
The condition of the compressed air supplied from the
Chip removal that can further improve the chip recovery rate.
An object of the present invention is to provide a milling tool with an extension mechanism .

[0008]

SUMMARY OF THE INVENTION According to the present invention, a cutting tip is mounted on an outer peripheral portion of a tip end of a tool main body which is rotated around an axis, and the tool main body is covered around the outer peripheral surface of the tool main body. A cover that defines a chip storage room that opens to the side is provided.
In the milling tool with a chip discharge mechanism in which the cover has a discharge port communicating the chip storage chamber and the outside of the cover, a spout opening toward the tool front end side is provided at a front end portion of the cover. An air adjusting member which is formed in the circumferential direction and which has a distal end portion protruding inward in the radial direction of the cover is provided outside the distal end portion of the cover so as to be able to advance and retreat along the axial direction of the cover. .

Further, the air adjusting member may have a structure in which an inner peripheral portion thereof is screwed to an outer peripheral portion of the cover.

[0010]

In the milling tool with a chip discharging mechanism according to the above configuration, the cover is positioned and fixed in the circumferential direction, and the amount of the air adjusting member protruding from the cover in the axial direction is adjusted. Exhaust air from the outlet
Then, air is jetted from the jet port toward the tip of the tool, and the tool body is rotated about the axis in this state, and the workpiece is sequentially cut with the cutting tip mounted on the tool body.

At the time of cutting, the compressed air ejected from the ejection port comes into contact with the surface of the work material while surrounding the entire circumferential direction of the cover, and the flow of 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 the compressed air in contact with the surface of the work material is changed to the flow of air from the vicinity of the tip of the tool body toward the chip storage chamber.
Attracted and merged, guided from the outlet to the outside of the cover
Yuku been issued.

Therefore, the chips generated by the cutting edge chips are prevented from being scattered to the outside of the cover by the above-mentioned blocking layer, and at the same time, toward the chip storage chamber by the flow of the compressed air toward the chip storage chamber. Movement is further promoted, and the chip recovery rate is improved.

Further, the compressed air ejected from the ejection port is determined in a radial ejection direction (ejection angle) or a pressure at the time of ejection in accordance with the position of the air adjusting member in the axial direction with respect to the cover. It is ejected in a state suitable for the conditions. That is, if the cut is deep, the air adjustment unit
The air is moved by moving the material to a position
Jet pressure increases, effectively guiding thick and heavy chips.
Wear. If the cut is shallow, attach the air adjustment member first.
Move it to the end to reduce the air ejection pressure,
It can be guided without scattering chips. Especially when the work material
In the case of aluminum, etc., is the chip as light as paper?
Therefore, it is preferable that a compressed air flow is formed at a weak air pressure.
Good. In this way, the chip recovery rate can be further improved.
You .

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a chip discharging mechanism according to an embodiment of the present invention.
Is an axial cross-sectional view showing a milling tool attached, FIG. 2 is the same chips
It is a bottom view of the milling tool with a discharge mechanism .

The milling tool with a chip discharging mechanism shown in these figures has the same basic structure as that shown in FIGS. 4 to 7 except for the structure of a cover and a tip side portion described later. A tool body 42 having a substantially cylindrical shape and having a tip end side whose diameter is enlarged, and a cover 46 which covers the outer peripheral surface of the tool body 42 and defines a chip storage chamber 44 which is open to the tool tip side. It is provided with.

A plurality of chips 50 fixed by a wedge member 48 are mounted at equal intervals in the circumferential direction on an outer peripheral portion on the distal end side of the tool main body 42, and are inserted into chip pockets 52 formed corresponding to the respective chips 50. The chip guide member 54 is mounted and fixed by bolts 56. In the center of the tool body 42, a central hole 5 penetrating the tool body 42 in the axial direction is provided.
8 are formed, and the center hole 58 is fitted with the fitting shaft 6 of the arbor 60.
After the 2 is fitted, the tightening bolt 66 is tightened via the stepped sleeve 64, and both are fixed integrally. The arbor 60 is fixed to the main shaft of the machine tool via a key inserted into the key groove 68 in the same manner as the above described chip suction type milling tool.

The structure of the cover 46, which is a feature of the present embodiment, and the distal end portion thereof is as follows. Cover 46
Are radial bearings 70 fitted to the arbor 60,
An outer cover 74 fitted to the outside of the outer cover 72 and an inner cover 76 fixed to the inside of the outer cover 74 with screws 78 are provided, and are rotatable around the tool axis with respect to the tool body 42. ing.

Between the outer cover 74 and the inner cover 76,
A substantially ring-shaped air supply chamber 80 and the air supply chamber 8
An air supply path 82 extending in a cylindrical shape is formed below the air supply path 0, and a jet port 84 that opens toward the tool tip side over the entire circumferential direction is formed in a lower part of the air supply path 82 so as to communicate therewith. ing. Also, beside the air supply chamber 80,
An air inlet 86 communicating between the inside of the air supply chamber 80 and the outside of the cover 46 is formed. The other end of a tube 88 having one end connected to a compressed air supply means such as a compressor (not shown) is connected to the air inlet 86. It is connected to. The air supply chamber 80 and the air supply path 82 constitute a blowing section.

On the side of the cover 46, there is formed a suction port 90 for communicating the chip storage chamber 44 with the outside of the cover 46. The suction port 90 has a suction port connected to a suction machine (not shown). One end of the hose 92 is connected. A portion of the suction port 90 communicating with the air supply path 82 is filled with a seal member 94 to isolate the air supply chamber 80 from the inside of the suction port 90.

An air adjusting member 96 having a substantially cylindrical shape is provided outside the front end portion of the cover 46. A screw portion 46a is formed on the outer peripheral portion on the distal end side of the cover 46, and a screw portion 96a screwed to the screw portion 46a is formed on the inner peripheral portion of the air adjusting member 96. The cover 46 is rotated about its axis with respect to the cover 46, so that advance and retreat can be performed along the axial direction of the cover 46.

The distal end portion 98 of the air adjusting member 96 has a shape projecting radially inward of the cover 46 in a ring shape. In the present embodiment, in the axial section shown in FIG. 1, the angle θ1 formed by the tip inner surface 98a with respect to the tool axis X1 is set in the range of 30 ° to 60 °.

In the milling tool with a chip discharging mechanism according to the above configuration, the arbor 60 is mounted on the main shaft of the machine tool, and the cover 46 is positioned and fixed in the circumferential direction. After adjusting the amount of protrusion in the axial direction, the air in the chip storage chamber 44 is sucked from the suction port 90, and compressed air is blown in from the blow-in port 86 to be blown out from the blow-out port 84 toward the tool tip side. Then, in this state, the tool main body 42 is rotated around the axis, and the chip 50 mounted on the tool main body 42 sequentially performs plane cutting of the work material.

At the time of cutting, the compressed air ejected from the ejection port 84 abuts on the surface of the work material while surrounding the entire circumferential direction of the cover 46, and between the tip of the cover 46 and the surface of the work material. The barrier layer is formed by the flow of the compressed air. Then, all or most of the flow of the compressed air in contact with the surface of the work material is attracted to the flow of the suction air from the vicinity of the tip end of the tool body 42 toward the chip storage chamber 44 and merges.
It is sucked from the suction port 90 to the outside of the cover 46. Therefore, the chips generated by the chips 50 are prevented from being scattered to the outside of the cover 46 by the compressed air flow blocking layer, and at the same time, the chips are stored in the chip storage chamber 44 by the flow of the compressed air toward the chip storage chamber 44. The oncoming movement is further promoted, which improves the chip suction rate.

Further, the compressed air ejected from the ejection port 84 comes into contact with the surface of the work material in a state where the state is adjusted by the distal end portion 98 of the air adjusting member 96. That is,
In the case of the embodiment shown in FIGS. 1 and 2, for example, the depth of cut is deep.
In this case, if the air adjusting member 96 is moved upward in the axial direction with respect to the cover 46, the pressure of the compressed air that is emitted from the ejection port 84 is increased toward the axis X1 in the ejection direction, and the pressure that is ejected at the same time is increased. Can be Therefore, thick and heavy
Chips can be effectively guided by the compressed air flow. Conversely, cut
When the air adjustment member 96 is moved downward in the axial direction, the inclination of the ejection direction toward the axis X1 is reduced,
The pressure at the same time is also reduced, and thin and lightweight chips are
It can be effectively guided without scattering. Therefore, by adjusting the position of the air adjusting member 96 in the axial direction, it is possible to make the compressed air ejection state suitable for the cutting conditions,
The chip suction efficiency is further improved.

The shape of the tip of the air adjusting member 96 is not limited to the shape shown in the above embodiment, but can be variously modified. For example, as shown in FIG. 3, as shown in FIG. 3, by making the inner surface 98 a of the distal end portion orthogonal to the axial direction, the pressure of the compressed air ejected from the ejection port 84 can be more easily adjusted. It is possible to do.

In the above embodiment, the air adjusting member 96 is screwed to the outer peripheral portion of the cover 46. For example, a long hole extending in the axial direction is formed in the air adjusting member 96 so that the cover 46 is bolted. It is also possible to adopt a configuration of stopping.

[0027]

As described above, according to the present invention, switching according to the present invention
According to the milling tool with a dust discharge mechanism , the axial adjustment amount of the air adjustment member is adjusted with respect to the cover, so that it is supplied from the tip of the cover according to cutting conditions such as the depth of cut and the weight of the work material. The state of the compressed air to be generated can be adjusted, and the chip recovery rate can be further improved.

[Brief description of the drawings]

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

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

FIG. 3 is a partially enlarged view according to another embodiment of the present invention.

FIG. 4 is an axial cross-sectional view showing a conventional chip suction type milling tool.

FIG. 5 is a bottom view of the chip suction-type milling tool of FIG. 4;

FIG. 6 is a view of the chip suction type milling tool of FIG.

FIG. 7 is a diagram for explaining position adjustment of a movable cover.

[Explanation of symbols]

 42 Tool main body 44 Chip storage chamber 46 Cover 50 Cutting blade tip 80 Air supply chamber 82 Air supply path 84 Spout port 86 Blow-in port 90 Suction port 96 Air adjustment member

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Shimizu 1511 Furamagi, Ishishita-cho, Yuki-gun, Ibaraki Pref. Mitsubishi Materials Corporation Tsukuba Works 58-146639 (JP, U) JP-B 63-5212 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23Q 11/00 B23C 9/00

Claims (2)

(57) [Claims] 1. A cutting tip is attached to an outer peripheral portion of a tip of a tool body rotated around an axis, and the tool body is
A cover that covers the outer peripheral surface of the tool main body and that defines a chip storage chamber that is open to the tool tip side is provided , and the cover has a discharge port that communicates the chip storage chamber with the outside of the cover. In a milling tool with a chip discharging mechanism, a spout opening toward the tool tip side is formed in a circumferential direction at a tip side portion of the cover, and a tip portion is formed outside the tip side portion of the cover. A rolling tool with a chip discharging mechanism , wherein an air adjusting member protruding radially inward of the cover is provided so as to be able to advance and retreat along the axial direction of the cover. 2. The milling tool with a chip discharge mechanism according to claim 1, wherein an inner peripheral portion of the air adjusting member is screwed to an outer peripheral portion of the cover.