JPH0577070A - Cutter and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent the physical properties of a cutter material from deteriorat ing and to obtain a satisfactory joining strength of an edge material by forming a diffusive layer where a base material and the edge material diffuse mutually at a joining part between the base material forming a cutter body and the edge material forming the edge part. CONSTITUTION:The diffusive layer 14 having a depth (h) is formed over all part joining the base material 10 and edge material 12. In this diffusive layer 14 the base material 10 and the edge material 12 diffuse into each other and the hardness is formed to become gradually lower toward the side of the base material 10 from the side of the edge material 12. Accordingly, stress is difficult to concentrate to this joining part and the joining part is difficult to crack. Further, it is possible to join the base material 10 to the edge material by a very short time of irradiation with laser beam or electron beam in the minimum rise of temperature, therefore, the cutter can be manufactured without deteriorating the property of material such as the edge hardness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade formed by joining a base material with a blade and a method for manufacturing the same.

[0002]

2. Description of the Related Art A knife (kitchen knife, etc.) of this kind is obtained by joining a base material forming a main body of a tool with a base material forming a cutting edge. FIG. 4 shows an example of a conventional blade of this type.
And as shown in FIG. 5, the joining of the blade material 2 to the base material 4 is performed as follows.

First, as shown in FIG. 5, a concave portion 4a is formed in the joint portion of the base material 4, and a convex portion 2a having a shape to be fitted in the concave portion 4a is formed in the joint portion of the blade material 2. Then, the convex portion 2a is fitted into the concave portion 4a in a state where both members 2 and 4 are heated, and this joint portion is tapped from the side surface to press the joint portions of both members 2 and 4 into pressure contact. After this, heat both members 2, 4 again,
Hit the joint from the side. After that, this operation is repeated several times to completely join the members 2 and 4 to manufacture the blade 6.

[0004]

By the way, the inventors have tried to manufacture a blade using a special alloy such as a Ni heat resistant alloy as the blade material. However, this type of special alloy is characterized in that the composition and strength change greatly depending on the temperature history. For example, when the above conventional blade manufacturing method is applied to a blade material of Ni heat resistant alloy, the blade material and the base material are The blade material is excessively heated at the time of joining, the crystal structure is changed, the physical properties such as the strength of the blade material are remarkably deteriorated, and there is a drawback that it cannot be recovered by the subsequent heat treatment.

The present invention provides a blade and a method of manufacturing the same which can prevent the physical properties of the blade from deteriorating while minimizing the effect of heat on the blade, and can obtain a sufficient blade joint strength. That is the issue.

[0006]

The invention according to claim 1 is
A base material that constitutes the main body of the blade, and a blade made of a blade material that is joined to the base material and that constitutes a cutting edge, and the entire joint portion between the base material and the blade material, these base material and the blade material. And a diffusion layer formed by mutually diffusing is formed.

According to a second aspect of the present invention, in the state where the joint surface formed on the base material forming the blade body and the joint surface formed on the blade material forming the cutting edge are in contact with each other, the joint surface is formed. It is a method for manufacturing a blade in which the base material and the blade material are welded to each other by irradiating a laser beam or an electron beam, and a diffusion layer is simultaneously formed.

[0008]

In the blade according to the first aspect, the joint portion between the base material and the blade material is a diffusion layer in which the base material and the blade material are mutually diffused, and the diffusion layer goes from the blade material side to the base material side. The hardness is gradually reduced as it is formed. Therefore, even when a force is applied to the cutting edge, stress is unlikely to concentrate on the joint portion,
Hard to break.

According to the method of manufacturing a blade according to claim 2,
The base material and the blade material are welded in a short time by irradiating the joining surface of the base material and the blade material with a laser beam or an electron beam.
Therefore, the temperature of the blade material hardly rises during joining, and the physical properties of the blade material do not deteriorate even when a special alloy is used as the material of the blade material.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 2 is a side view of a cutting tool according to an embodiment of the present invention, and FIG. 1 is an enlarged sectional view taken along line BB of FIG. The blade 8 shown in these figures is composed of a base material 10 that constitutes the blade body and a blade material 12 that constitutes the cutting edge. The base material 10 is made of SUS or a Ni heat resistant alloy that is softer than the blade material 12. The blade material 12 is made of a material having both hardness and toughness, and if one example is given, it is C by weight%.
r; 14-23%, Mo; 14-20%, W; 0.2
5%, Fe; 0.2-7%, Co; 0.2-2.5%, the balance of Ni and Ni unavoidable impurities hot-rolled Ni heat-resistant alloy (trade name: Hastelloy) solution treatment After applying, the cold working gives a plastic working with a working rate of 80% or more,
Then, a product obtained by heating this at 500 to 600 ° C. for 0.5 hour or more is preferable.

At the joint between the base material 10 and the blade 12, a diffusion layer 14 having a thickness h is formed over the entire joint, as shown in FIG. The diffusion layer 14 is formed of the base material 10
And the blade material 12 are mutually diffused, and the blade material 1
The hardness is gradually reduced from the second side toward the base material 10 side. The thickness h of the diffusion layer is 0.5)
It is desirable to be formed to 10 mm. This is because if the thickness is less than 0.5 mm, the stress diffusion effect is small and the joint may be cracked. On the contrary, if it is thicker than 10 mm, the physical properties of the cutting material 12 may deteriorate when the diffusion layer is formed.

A method of manufacturing the above-mentioned blade 8 will be described with reference to FIG. First, the joining surface 10a of the base material 10 and the blade material 12
The joining surface 12a of is made flat.

Next, in a state in which the joint surfaces 10a and 12a are brought into contact with each other and brought into close contact with each other, a direction parallel to the joint surfaces 10a and 12a (FIG.
The laser beam is irradiated in the direction of arrow C). And
Along with the irradiation of this laser beam, the blade 8
Is moved in the longitudinal direction (the direction of arrow D in FIG. 2).

Although the desirable laser beam output condition varies depending on the thickness of the blade, it is generally as follows. Carbon dioxide laser output: 0.5-10kw

The radiated laser beam melts the joint portion between the base material 10 and the blade material 12 in a short time, and the base material 10 and the blade material 12 are melted.
The blade material 12 is welded to the blade material 12 to manufacture the blade 8.
At this time, the material of the base material 10 and the blade material 12 are attached to the joint portion.
The materials described above are mutually diffused to form the diffusion layer 14 shown in FIG. When the beam is irradiated, the heating range is widened due to the divergence angle of the laser.
It is preferable to bring 2 into contact with the cooling plate (heat sink). The thickness of the diffusion layer can be controlled by adjusting the degree of cooling by the heat sink.

According to the method for manufacturing a blade as described above, when the base material 10 and the blade material 12 are welded, the electron beam need only be irradiated for an extremely short time, so that the blade material 12 is hardly heated and the blade material 12 is not heated. The temperature rise is minimized. Therefore, the deterioration of the physical properties of the blade material 12 such as the decrease in the hardness of the cutting edge does not occur.

Further, in the blade 8 manufactured by such a manufacturing method, since the above-mentioned diffusion layer 14 is formed over the entire joint between the base material 10 and the blade material 12,
While the base material 10 and the blade material 12 are firmly joined,
Stress is less likely to concentrate on this joint, and the joint is less likely to crack.

In the above embodiment, the base material 10 and the blade material 12
Although the laser beam is used for the welding of, the electron beam may be similarly used.

In the above embodiment, the heat-resistant Ni alloy is preliminarily heat-treated at 500 to 600 ° C.
However, it is also possible to use a Ni heat resistant alloy that has not been subjected to the above heat treatment as a blade material, and to perform the above heat treatment after welding with the base metal.

[0020]

As described above, in the cutting tool of the present invention, the diffusion layer formed by the mutual diffusion of the base material and the blade material is formed over the entire joint portion between the base material and the blade material. As a result, the base material and the blade material are firmly joined together, and the stress concentration is less likely to occur at this joint portion, so that the joint portion is less likely to crack.

Further, according to the method for manufacturing a cutting tool of the present invention, the base material and the cutting material can be welded by irradiation of the laser beam or the electron beam for an extremely short time, and the temperature rise of the cutting material can be minimized. It is possible to suppress and bond the base material and the blade material. Thereby, the blade can be manufactured without deteriorating the physical properties such as the hardness of the blade.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view taken along line BB of FIG.

FIG. 2 is a side view showing a blade according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram according to the embodiment.

FIG. 4 is a side view showing a conventional blade.

5 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 10 Base Material 10a Bonding Surface (Base Material) 12 Blade Material 12a Bonding Surface (Blade Material) 14 Diffusion Layer

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[Procedure amendment]

[Submission date] August 27, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

According to the method for manufacturing a blade as described above, when the base material 10 and the blade material 12 are welded, it is sufficient to irradiate the laser beam for an extremely short time. The temperature rise is minimized. Therefore, the deterioration of the physical properties of the blade material 12 such as the decrease in the hardness of the cutting edge does not occur.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Kawaoka 1-297 Kitabukuro-cho, Omiya City, Saitama Prefecture Mitsubishi Materials Corporation Product Development Center

Claims (2)

[Claims] 1. A blade comprising a base material forming a blade main body and a blade material joined to the base material to form a cutting edge, wherein the base material and the blade material are joined to each other over the entire joint portion. A blade comprising a diffusion layer formed by mutual diffusion of a blade material and a blade material. 2. A laser beam or an electron beam is applied to the joining surface in a state where the joining surface formed on the base material forming the blade main body and the joining surface formed on the blade material forming the cutting edge are in contact with each other. And irradiating the base material with the blade material to form a diffusion layer at the same time.