JPH06190681A - Cutting tool - Google Patents

Abstract

PURPOSE:To provide an excellent cutting tool in which liquid can be sufficiently supplied to a cutting point, in a cutting tool using cutter tips. CONSTITUTION:A water injection member having a discharge port 19 through which high pressure liquid can be discharged toward the cutting edge flanks 14a of cutter tips 14 are provided at regular intervals on the outer circumferential part of recessed face 17 inside the underside of a holder 11. A water injection passage 18 communicating to the discharge port 19 is formed in the water injection member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool such as a face mill.

[0002]

2. Description of the Related Art Conventionally, in cutting, a liquid such as oil or water is applied to the cutting portion for the purpose of cooling the cutting portion and removing chips. However, the cutting point itself is because the cutting edge of the workpiece and the cutting tool are in pressure contact,
It is not easy to apply enough liquid to the cutting point. If the liquid is not sufficiently applied to the cutting point, the cutting edge will be damaged by the cutting heat, and the chips with the cutting heat will cover the surface of the workpiece and a part of the machine. When heated and expanded and cutting in that state, the processing dimensions are distorted, the work surface is melted by the cutting heat, and the molten metal adheres to the cutting edge of the cutting tool to form a so-called "constituent edge" and cutting is possible. Since problems such as disappearance occur, the solution is strongly desired.

Therefore, recently, in order to make it possible to spray liquid nearer the cutting point, for example, in a cutting tool having a cutter tip 2 attached to the tip of the holder 1, as shown in FIG. As shown in FIG. 9, a water channel 3 is formed so that liquid can be sprayed toward the cutting edge of the cutter tip 2 or a drill tool, as shown in FIG.
A spiral water injection channel 4 was formed on the inside of the blade, and it was developed that the liquid can be sprayed from the center of the tool tip.
Used in part. Corresponding to these tools, machine tools such as lathes and machining centers having a water injection means communicating with the water injection paths 3 and 4 of the tools have been developed.

[0004]

However, these tools with a liquid spraying function are designed to carry out liquid spraying from the sliding surface side of the cutting edge solely for the purpose of chip removal. Although it is possible to suppress the heat generation to a certain extent, it is not possible to directly cool the cutting point and its surroundings, so various troubles due to the cutting heat are likely to occur.

The present invention has been made in view of such circumstances, and in a cutting tool using a cutter tip,
It is an object of the present invention to provide an excellent cutting tool that can sufficiently apply liquid to a cutting point.

[0006]

In order to achieve the above object, the cutting tool of the present invention has a plurality of cutout recesses formed at predetermined intervals in the circumferential direction at the lower portion of a substantially cylindrical holder, and the cutout recesses of each cutout recess are formed. In a cutting tool in which a cutter tip is attached to one side and the inside of the bottom surface other than this cutter tip mounting portion is recessed, a high pressure is applied to the recessed surface on the inside of the bottom surface of the holder toward the cutting edge flank of each cutter tip. A water injection member in which ejection ports capable of ejecting liquid are formed at predetermined intervals in the circumferential direction is attached, and a water injection passage communicating with the ejection port is formed in the water injection member.

[0007]

That is, the present inventor has conducted a series of researches on a structure in which a cutting tool having a cutter tip attached thereto is sufficiently liquid-poured toward the vicinity of the cutting point. Then, in the process, in the cutting tool such as a face milling machine, in which the cutter tips are attached to the lower part of the holder at predetermined intervals in the circumferential direction, the inner portion of the lower surface other than the cutter tip attaching portion is concavely recessed to the workpiece. Paying attention to the fact that there is a gap, on the other hand, using this gap, it is not possible to apply liquid to the flank of the cutting edge, which was conventionally thought to be impossible. Recalling
Further series of research was repeated. As a result, the concave surface is attached with a water injection member having a discharge port capable of discharging high-pressure liquid toward the cutting edge flank of each cutter tip, and the high-pressure liquid is supplied from each discharge port to the cutting edge flank of the cutter tip. It was found that the cutting point can be directly cooled from the flank side by discharging, and the present invention was reached.

Next, the present invention will be described in detail based on embodiments.

[0009]

1 is an embodiment in which the present invention is applied to a face milling machine. The left half shows a front view and the right half shows a sectional view. Further, FIG. 2 is a view of the front milling cutter 10 looked up from directly below. The front milling cutter 10 has a large-diameter hollow portion 11a formed in a lower portion of a substantially cylindrical holder 11, and cutout concave portions 11b are provided at predetermined intervals on the outer periphery thereof. Then, on one surface in each notch recess 11b,
A cemented carbide cutter tip 14 is held via a sheet 12 and a supporter 13, and next to this, a top and bottom 2
The wedges 15 and 16 are individually screwed by a clamp screw (not shown). This wedge 1
By screwing 5, 16 the cutter tip 14
Together with the seat 12 and the supporter 13 are pressed and fixed to one surface in the cutout recess 11b.

As shown in FIG. 2, a disc-shaped water injection member 31 is attached to the recessed surface 17 of the holder 11 by three screws 30. Around the water injection member 31, there are provided six discharge ports 19 that extend obliquely from the six water injection passages 18 radially formed therein and are opened. As shown in
The high-pressure liquid is discharged toward the cutting edge flank 14a of the cutter tip 14. In addition,
The water injection into the water injection passage 18 is performed by using a mounting shaft (not shown) to which the front milling cutter 10 is attached.

The front milling cutter 10 is mounted on a known milling machine device (having a function of pouring water into the water filling passage 18 of the water pouring member 31), and the high pressure liquid is supplied from the discharge port 19 of the front milling cutter 10 by the arrow P. When the cutting process is performed by discharging as shown in, the liquid can be directly sprayed from the cutting edge flank 14a in the vicinity of the cutting point where the cutter tip 14 is pressed against the workpiece X. Most of the heat generated in the work piece X and the face milling cutter tip 1
4 does not conduct inside, and neither the workpiece X nor the cutting edge of the cutter tip 14 is thermally damaged. As a result, high-speed cutting for hard workpieces that have had many problems in the past,
It can be done well over a long period of time.

In the above face milling cutter 10, as shown in FIG. 3, the liquid can be directly sprayed to the cutting edge flank 14a, which has been conventionally difficult to spray, to a position very close to the cutting point. Even if the cutting edge flank surface 14a of the cutter tip 14 is initially a smooth surface, this surface wears along with the progress of cutting and many streaks are formed in the vertical direction. It seems that it is because it enters. Then, once the liquid enters this streak, not only the effect of directly cooling the cutting point but also the cutting edge flank 14a
The smoothness of the surface is improved, and the wear on this surface is significantly suppressed.

By the way, in the front milling cutter 10, the liquid is sprayed by the cutting edge flank 14a of the cutter tip 14.
It is suitable not only to perform it on the cutting edge sliding surface 14b. Therefore, as shown in FIG. 4, for the cutting edge sliding surface 14b, a discharge port 20 is provided on the end surface of the wedge 16 on the tip side of the two, and the cutting edge sliding of the cutter tip 14 is provided from this discharge port 20. It is preferable to discharge the high-pressure liquid toward the surface 14b as indicated by the arrow Q. In this case, the water injection path 21 reaching the discharge port 20 is formed in the holder 11 and the wedge 16. According to the face milling cutter 10 ', as shown by the arrow P, the high pressure fluid is sprayed onto the cutting edge flank 14a, so that the effect as described above can be obtained.
Since liquid is sprayed with the high-pressure liquid on the cutting edge sliding surface 14b as shown by the arrow Q, the generated chips can be immediately cooled and removed, the cutting accuracy is further improved, and the tool life is extended.

By the way, when a face milling machine having the same construction as that shown in FIG. 4 was used and a planing process was carried out under the following conditions, it could not be machined under the following conditions in the past, but a good work finish was obtained. I got the goods.

Workpiece: Material SKD61 Hardness HRC45 ° Shape Flat plate Face milling: Material of chip Cutting conditions: Cutting speed 100m / min: Depth of cut 3mm: Feed rate 0.1mm / revolution / per blade

In the above embodiment, the disk-shaped water injection member 31 is attached to the recessed surface 17 of the holder 11 and the discharge port 19 is provided around the disk injection member 31. As shown, six individual water injection nozzles 32 may be attached to inject water from inside the holder 11. Of course, the tip discharge port 32a of each nozzle 32 must face the cutting edge flank 14a of each cutter tip 14. In addition, the water injection nozzle 32,
There is no problem even if the water injection nozzles 32 are radially extended around the small-diameter disk-shaped water injection member instead of being directly attached to the recessed surface 17 of the holder 11.

Further, although the face milling cutter 10 is used as the cutting tool in these embodiments, the present invention is not limited to this, and is applied to various cutting tools for planing, drilling, grooving and the like. can do. And it is not limited to the one mounted on the milling machine,
It can be applied to those that can be mounted and used in various cutting devices such as NC lathes.

The high-pressure liquid discharged from the discharge port 19 (and the discharge port 20 of the wedge 16) may be water or oil, or may contain various chemicals. . The discharge pressure is set appropriately according to the cutting conditions, but generally 5 to 200 kg.
It is preferable to set to / cm ² .

Depending on the cutting tool, as shown in FIG. 7, a portion for holding the cutter tip 14 (corresponding to the supporter 13 in the above embodiment) and a portion for attaching the whole to the holder 11 (corresponding to the wedge 16). There is a case where the square cartridge 22 integrally formed with and is used. In this case, in the portion corresponding to the wedge of the square cartridge 22, the discharge port 20 and the injection port similar to those provided in the wedge 16 in FIG. A waterway 21 is formed to form a cutting edge sliding surface 14
If liquid is applied to b as well, the same effect as in the above embodiment can be obtained.

[0020]

As described above, the cutting tool of the present invention is
A water injection member having a discharge port capable of discharging the high-pressure liquid toward the cutting edge flank of each cutter tip provided at a predetermined interval on the outer peripheral portion is attached to the concave surface inside the lower surface of the holder. Therefore, according to the present invention, since it is possible to directly pour liquid in the vicinity of the cutting point from the flank of the cutting edge, which has hitherto been considered impossible to pour liquid, it is possible to exhibit a very excellent cooling effect. It is possible to maintain good cutting performance for a long period of time. Moreover, since liquid enters the cutting edge flank surface, the cutting edge flank surface, which was often damaged by friction with the workpiece, is as smooth as possible, so that damage to this surface can be suppressed. Also effective.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a cutting tool used in the present invention.

FIG. 2 is a view of the tip portion of the cutting tool as seen from below.

FIG. 3 is an explanatory diagram of a usage mode of a cutting edge flank of a cutter tip.

FIG. 4 is a view of the tip of the cutting tool as seen from below.

FIG. 5 is a configuration diagram showing another embodiment of the cutting tool used in the present invention.

FIG. 6 is a view of the tip of the cutting tool as seen from below.

FIG. 7 is a perspective view of a square cartridge.

FIG. 8 is an explanatory diagram of an example of a conventional cutting tool.

FIG. 9 is an explanatory diagram of another example of a conventional cutting tool.

[Explanation of symbols]

 10 Front Milling Cutter 11 Holder 14 Cutter Tip 14a Cutting Edge Relief Surface 17 Recessed Surface 18 Water Injection Channel 19 Discharge Port 31 Water Injection Member X Workpiece

Claims (2)

[Claims] 1. A plurality of cutout recesses are formed in a lower portion of a substantially cylindrical holder at predetermined intervals in a circumferential direction, and a cutter tip is attached to one side of each cutout recess. In a concave cutting tool, a water injection member in which a discharge port capable of discharging high-pressure liquid toward the cutting edge flank of each cutter tip is formed at a predetermined interval in the circumferential direction on the concave surface inside the lower surface of the holder. And a water injection passage communicating with the discharge port is formed in the water injection member. 2. Each of the cutter tips is attached together with a wedge, and an ejection port capable of ejecting a high-pressure liquid toward a cutting edge sliding surface of the cutter tip is formed on an end surface of each wedge, and the ejection tip is formed. The cutting tool according to claim 1, wherein the water injection passage communicating with the outlet is formed in the wedge and the holder.