JPH0825108A - Cutting tool - Google Patents

Abstract

PURPOSE:To provide a cutting tool which radiates machining heat generated in a cutting edge tip because of cutting resistance during cutting operation without using any cooling fluid such as oil and cooling air specially. CONSTITUTION:In a cutting tool in which a cutting edge tip 1 is pressed and fixed in a shank 2 by means of a tip holder 3, a cluster diamond layer 2a having good heat conductivity is formed on a surface of each of the shank 2 and the tip holder 3, so that machining heat in the cutting edge point tip 1 is radiated via the cluster diamond layers 2a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool used for cutting, and is particularly characterized by a heat dissipation structure for processing heat generated during processing.

[0002]

2. Description of the Related Art Generally, a cutting tool is used for cutting metal materials. FIG. 3 is an exploded perspective view showing an example of a conventional cutting tool, in which 1 is a cutting edge tip for actually cutting, 2 is a shank to which the cutting edge tip 1 is attached, and 3 is the cutting edge tip. 1 is a chip holder that press-fixes the shank 2 to the shank 2. The central part of the chip holder is firmly fixed to the shank 2 by a screw 4 at the time of mounting, and the cutting edge chip 1 is press-fixed to the shank 2 at the tip thereof. . Conventionally, the shank 2 mainly functions as a mounting base, and a soft steel material whose size and length can be freely changed according to the shape of the mounting portion of the equipment and the shape of the workpiece is used. I didn't need any restrictions. On the other hand, the cutting edge tip 1 is
The tip life is determined by conditions such as the roughness of the machined surface, dimensional accuracy, cutting waviness, and sharpness, and frequent replacement is required, so the shape is extremely compact and standardized for easy replacement. Has become.

When cutting is performed, the generation of cutting heat is unavoidable, and this cutting heat causes a temperature rise in the cutting tool itself, resulting in variations in machining dimensions and roughness of the machined surface. Was the cause of deterioration of the tool life and shortening of the tool life. Further, the amount of cutting heat generated increases in proportion to the cutting resistance, and how to suppress the temperature rise of the cutting edge and perform stable cutting was an important technical element.

Therefore, conventionally, the processing heat generated in the cutting edge tip can be prevented from rising by forced cooling. Specific means include cutting oil such as oily or water-based cutting oil, cooling air, and the like. During cutting, these are always jetted to the cutting edge tip to cool them.

[0005]

The cooling means as described above requires a device for constantly injecting oil, air, or the like, into the cutting edge tip portion, and the use thereof causes environmental pollution. Due to problems and chip disposal,
There was a problem that the cutting device was complicated and upsized.

The present invention has been made in consideration of the above conventional problems, and an object of the present invention is to provide a cutting tool capable of effectively suppressing a temperature rise without increasing the size of the device.

[0007]

In order to achieve the above object, the present invention provides a cutting tool in which a cutting edge tip is pressed and fixed to a shank by a tip holder, and a cluster diamond layer is formed on at least the surface of the shank. And Further, in the present invention, the shank is provided with a fin for heat dissipation.

[0008]

In this structure, diamond has a thermal conductivity about 5 times that of copper. Therefore, the cutting heat generated in the cutting edge tip during cutting can be dissipated into the air through the cluster diamond layer formed on the surface of the shank, and the fins formed on the shank can effectively dissipate the heat. Therefore, it is possible to achieve cutting conditions of high efficiency, high accuracy, and long life with a simple equipment configuration that does not particularly require other cooling means as in the conventional case.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of the cutting tool of the present invention, and the same components as those of the conventional example shown in FIG. 3 are designated by the same reference numerals.

A feature of this embodiment is that a cluster diamond layer 2a having a grain size of 40 nm to 60 nm is formed on the surfaces of the shank 2 and the tip holder 3. The cluster diamond layer 2a has a thickness of 0.015 mm
And immersing the shank 2 and the chip holder 3 in an electrode nickel plating liquid having a ratio of 87% by weight of nickel, 9.3% by weight of phosphorus and 3.7% by weight of cluster diamond,
It is formed by electroless plating.

According to this structure, since the thermal conductivity of diamond is extremely high, the heat generated in the cutting edge tip 1 is quickly transferred to the shank 2 and the tip holder 3 by the cluster diamond layer 2a. A partial temperature rise of the cutting edge tip 1 is suppressed, and stable cutting can be expected. This eliminates the need for cooling means such as cutting oil, which has been conventionally required, and enables clean cutting with a simple structure.

FIG. 2 shows another embodiment of the present invention.
In this embodiment, a large number of so-called cooling fins 2b are formed on a part of the shank 2, and a cluster diamond layer is also formed on this cooling fin 2b.

The thickness of the cluster diamond layer may be 0.01 mm or more. The thicker the layer, the better the heat dissipation effect, but the problems of mechanical strength, economical efficiency, etc., are less than 0.01 mm. It is preferably about 02 mm.

In the above embodiment, the electroless nickel plating method was introduced as the method for forming the cluster diamond layer, but electroless plating of cobalt, copper, gold or the like, or electrolytic plating may be used.

[0015]

As is apparent from the above description of the embodiments, according to the present invention, it is possible to effectively achieve the heat dissipation of the cutting edge tip with the simple structure of forming the cluster diamond layer on the shank. In particular, cooling oil, which has hitherto been regarded as a problem from the viewpoint of environmental pollution, may be used, and its effect is great.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a cutting tool according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a cutting tool according to another embodiment of the present invention.

FIG. 3 is an exploded perspective view of a conventional cutting tool

[Explanation of symbols]

 1 Cutting edge tip 2 Shank 2a Cluster diamond layer 2b Cooling fin 3 Tip holder

Claims (2)

[Claims] 1. A cutting tool in which a cutting edge chip is pressed and fixed to a shank by a chip holder, wherein a cluster diamond layer is formed on at least the surface of the shank. 2. The cutting tool according to claim 1, wherein the shank has a fin for heat dissipation.