JP4135868B2 - Air self-contained rotary cutting tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary cutting tool such as a milling cutter and an end mill, and more particularly, to an air self-feeding rotary cutting tool provided with blades for blowing air to a cutting edge tip and a chip pocket.
[0002]
[Prior art]
When chips are accumulated around the cutting edge tip during cutting with the rotary cutting tool, the chips are bitten and the cutting edge is lost, or the tool body is worn due to chip abrasion. Excessive cutting heat also reduces the cutting edge life and causes deformation of the workpiece. There are cases where air is sprayed onto the cutting site to take measures against these problems. Conventionally, air is usually supplied through piping in a factory after being pressurized by a compressor. The air supply is generally an external supply method in which the tip of the nozzle is sprayed toward the cutting point, but recently, the air provided in the rotary cutting tool body through the air hole provided in the spindle or arbor of the machine tool. An internal supply system that injects from a hole is also in practical use.
[0003]
[Problems to be solved by the invention]
An object of the present invention is to easily create an air supply operation without requiring a special air supply device as described above. Another object is to eliminate the situation that an operator always has to accompany the external supply method.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides the following means.
The present invention is a rotary cutting tool in which a cutting edge tip is provided at the peripheral edge of the tip of an annular tool body, and a chip pocket is disposed in front of a rake face of the cutting edge tip, and the cutting tool of the tool body is The outer peripheral portion on the rear end side of the blade tip is notched, and a blade having a blowing action toward the tip is formed by the remaining portion of the notch, and an air hole for guiding the wind generated by the blade to the tip side is formed on the notch. It is drilled from the tip to the tip of the tool body . In other words, air can be supplied by air blowing like a fan.
[0005]
In the said invention, the said notch is good also as having a wall surface which faces a tool rotation direction.
Moreover, in the said invention, the said air hole is good also as inclining toward the tool rotation direction back with respect to the rotating shaft line of a tool main body.
[0006]
Further, in the above invention, the air hole has a blow-out opening that opens at the tip end surface of the tool body, and a communication groove that connects the blow-out opening and the chip pocket is recessed in the tip end face of the tool body. It is good also as being done. As a result, an air passage is formed between the communication groove and the surface of the work material, and between the chip pocket and the wall surface of the work material, and air is ejected from the front end to the rear end of the chip pocket.
[0007]
Moreover, in the said invention, the said air hole is good also as having a blowing outlet opened in the said chip pocket. By comprising in this way, the produced air comes to eject in the cutting blade vicinity, and brings the same effect as the conventional external supply system.
[0008]
Further, the present invention provides a cutting tool provided with a cutting edge tip at the tip peripheral portion of the annular tool body, and a mounting counterbore for mounting the tool body is provided at the center of the tip of the tool body. The mounting counterbore hole is cut out, and a blade having a blowing action toward the tip is formed by the remaining notch of the mounting counterbore, and air is drawn into the mounting counterbore notch. An air hole is drilled from the rear end side of the tool body to the notch of the mounting counterbore, and the outer peripheral side of the rear end side of the cutting tip of the tool body is notched. An inlet for the air hole is provided in the notch. In other words, air can be self-supplied by a blowing action like a ventilation fan. As a result, the air intake action due to the provision of the inlet in the notch on the outer periphery of the tool body is added to the suction action by the blades, and the air supply capability is enhanced.
[0009]
In the said invention, the notch of the said tool main body outer peripheral part is good also as having a wall surface which faces a tool rotation direction.
Moreover, in the said invention, it is good also as said air hole inclining toward the tool rotation direction back with respect to the rotating shaft line of a tool main body.
In the above invention, the air hole has a blowout opening that opens in the notch of the mounting counterbore, and a communication groove that connects the blowout opening and the chip pocket is formed in the tool body. It is good also as being recessed in the front end surface. As a result, an air passage is formed between the communication groove and the surface of the work material, and between the chip pocket and the wall surface of the work material, and air is ejected from the front end to the rear end of the chip pocket.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention, which is an example of a throw-away face mill for right-angle shoulder cutting. This front milling machine is configured such that a cutting edge chip 2 is detachably mounted on a plurality of chip seats formed by cutting out at the peripheral edge of a tip of a tool body 1 having an annular shape. The cutting edge tip 2 has a parallelogram flat plate shape, and is mounted by a tightening screw 3 inserted into a mounting hole provided in the center. Further, one side surface of the cutting edge chip 2 is a rake surface 4, and a chip pocket 5 is formed in front of the rake surface 4.
[0011]
In the outer peripheral portion of the tool main body 1, notches 6 corresponding to the number of the cutting edge tips 2 are usually provided in a portion on the rear end side of the cutting edge tips 2. This notch 6 is formed so as to have an action of embracing air by rotating the tool and blowing air to the front side of the face mill. In other words, the remaining part of the notch 6 of the tool body 1 is shaped to be a fan blade 7. And the air hole 8 penetrated from the front-end | tip part of the notch 6 to the front-end | tip part of the tool main body 1 is drilled, The wind produced by tool rotation is sent to a front-end | tip through the air hole 8. FIG.
[0012]
The front end opening of the air hole 8 becomes an air outlet 9. Then, a communication groove 10 is formed in the distal end surface of the tool body 1 so as to include the outlet 9. One end of the communication groove 10 communicates with the end of the chip pocket 5. At the time of cutting, the air supplied from the outlet 9 flows out into the chip pocket 5 through the ventilation path formed by the communication groove 10 and the surface 12 of the work material 11.
[0013]
When the front milling machine is a right-angle shoulder milling machine, an air passage is formed between the chip pocket 5 and the wall surface 13 of the work material 11, so that air further flows from the front end of the chip pocket 5 toward the rear end. Try to flow out. At this time, the cutting chips are blown out of the chip pocket 5 with air momentum. The air also has an action of cooling the cutting edge of the cutting edge tip 2. Such action of chip discharge and cooling by air appears more prominently in grooving or deep digging of the wall surface 13.
[0014]
FIG. 4 shows a second embodiment of the present invention, in which the same parts as those described above are denoted by the same reference numerals. The feature of the present invention is that the air outlet 9 of the air hole 8 is provided in the chip pocket 5. The air supplied from the blow-out port 9 is directly sprayed and cooled on the cutting edge of the cutting edge tip 2 and has the effect of blowing away the chips accumulated in the chip pocket 5. FIG. 4 exemplifies a face mill for right-angle shoulder cutting, but it is practically suitable for an angular face mill for which it is difficult to form an air passage between the work material 11 and the wall surface 13. have.
[0015]
5 to 7 show a third embodiment of the present invention, and the same portions as those described above are denoted by the same reference numerals. A center hole 14 and a mounting counterbore 15 for mounting the front milling cutter to the arbor are provided at the center of the tool body 1. A notch 6 is formed on the inner peripheral surface of the mounting counterbore 15. This notch 6 has a shape having an action of embracing air by rotating the tool and blowing air to the front side of the face mill. In other words, the remaining part of the notch 6 of the tool body 1 has a shape that acts as a blade 7 of the ventilation fan.
[0016]
In order to supply air to the ventilating fan-shaped portion, an air hole 8 that is drilled from the rear end side of the cutter body 1 and opens in the notch 6 is provided. If the inlet 16 of the air hole 8 is provided in the notch 17 provided in the outer peripheral portion of the rear end side of the cutting blade tip 2 of the tool body 1, the air blowing action is added to the suction action by the blades 7, and the air The supply capacity will be further increased.
[0017]
The notch 6 and the chip pocket 5 communicate with each other through a communication groove 10 that is recessed in the tip surface of the tool body 1. At the time of cutting, the air sucked from the air hole 8 is sent out to the chip pocket 5 through the ventilation path formed by the communication groove 10 and the surface 12 of the work material 11. When this front milling machine is a right-angle shoulder milling machine, an air passage is also formed between the chip pocket 5 and the wall surface 13 of the work material 11, so that air flows from the front end to the rear end of the chip pocket 5. It begins to flow.
[0018]
【The invention's effect】
With the blades formed by cutting out the tool body of the rotary cutting tool, the air produced by the air blowing action or suction action accompanying the tool rotation is sent out in the direction of the milling tip, and can be supplied to the chip pocket and the vicinity of the cutting edge. Therefore, an effect equivalent to a normal air supply effect such as chip discharge and cutting edge cooling can be obtained without installing a dedicated air supply device. In addition, in the case of a configuration in which air flows out from the front end side to the rear end side of the rotary cutting tool by the communication groove, it is possible to create an air flow from the front end of the chip pocket to the rear end. It is effective in the face milling.
[Brief description of the drawings]
FIG. 1 shows a front view of a first embodiment of the present invention.
FIG. 2 shows a bottom view of FIG.
FIG. 3 shows a plan view of FIG. 1;
FIG. 4 shows a front view of a second embodiment of the present invention.
FIG. 5 shows a front view of a third embodiment of the present invention.
6 shows a bottom view of FIG.
7 shows a plan view of FIG.
[Explanation of symbols]
1 Tool body 2 Cutting edge tip 5 Chip pocket 6 Notch 7 Blade 8 Air hole 10 Communication groove

Claims (9)

A rotary cutting tool in which a cutting edge tip is provided at the peripheral edge of the tip of the annular tool body, and a chip pocket is disposed in front of the rake face of the cutting edge tip,
The outer peripheral portion on the rear end side of the cutting edge tip of the tool body is notched, and a blade having a blowing action toward the tip is formed by the remaining notch,
An air self-contained rotary cutting tool characterized in that an air hole for guiding wind generated by the blades to the tip side is formed from the tip of the notch to the tip of the tool body . The air self-contained rotary cutting tool according to claim 1, wherein the notch has a wall surface facing a tool rotation direction .   The air hole is inclined backward in the tool rotation direction with respect to the rotation axis of the tool body.
The air self-contained rotary cutting tool according to claim 1 or 2, characterized in that   The air hole has a blowout opening that opens at the tip surface of the tool body,
  A communication groove connecting the blowout port and the chip pocket is recessed in the tip surface of the tool body.
  The air self-contained rotary cutting tool according to any one of claims 1 to 3, wherein: The air hole has a blowout opening that opens in the chip pocket.
The air self-contained rotary cutting tool according to any one of claims 1 to 3, wherein: A cutting edge tip is provided at the peripheral edge of the tip of the annular tool body, and a rotary cutting tool in which a mounting counterbore for mounting the tool body is disposed at the center of the tip of the tool body,
The mounting counterbore is notched, and a blade having a blowing action toward the tip is formed by the remaining notch of the mounting counterbore,
An air hole for drawing air into the notch of the mounting counterbore hole is drilled from the rear end side of the tool body to the notch of the mounting counterbore hole,
A rear end side outer peripheral portion of the cutting tool tip of the tool main body is notched, and an inlet for the air hole is provided in the notch of the outer peripheral portion of the tool main body.
An air self-contained rotary cutting tool. The notch on the outer periphery of the tool body has a wall surface facing the tool rotation direction.
The air self-contained rotary cutting tool according to claim 6. The air hole is inclined backward in the tool rotation direction with respect to the rotation axis of the tool body.
The air self-supporting rotary cutting tool according to claim 6 or 7, wherein The air hole has a blowout opening that opens in the notch of the mounting counterbore,
A communication groove connecting the blowout port and the chip pocket is recessed in the tip surface of the tool body.
The air self-supporting rotary cutting tool according to any one of claims 6 to 8, wherein

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