JPH0112958Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to blades.

As is well known, blades are required to have both hardness for wear resistance and toughness for tenacity. If only hardness is prioritized, it will become brittle, and conversely, if only toughness is prioritized, it will wear out quickly.

In order to solve this problem, a blade has been proposed in which the cutting edge and the blade body that make up the blade are made of a metal with high toughness. According to this, the toughness of the blade body can compensate for the fragility of the entire blade. For example, one of them is the technique found in Japanese Utility Model Application Publication No. 135501/1983.

However, in the case of the type of technology that uses a metal with high toughness for the blade body, the conventional technology uses steel. Compared to this steel blade, a blade made of cemented carbide is preferable for a blade that is harder and more wear-resistant, but in the case of a conventional blade made of cemented carbide, As seen in Publication No. 174987, since it consists of only one cemented carbide layer, it does not satisfy both the hardness and tenacity, which have been problems with the conventional method.

Therefore, regarding this single layer cemented carbide blade,
As proposed in the aforementioned Japanese Utility Model Publication No. 49-135501, it is conceivable to make the blade body highly tough, and this would produce the desired effect; Due to the difference in the materials of the cemented carbide and the cemented carbide, in order to integrate the two layers of the cemented carbide cutting edge and blade body, the two layers of steel must be integrated by forge welding as in Japanese Utility Model Application Publication No. 135501/1983. When using such technology,
There were manufacturing problems in achieving the original goal of creating a double-layered cemented carbide blade that had both wear resistance and tenacity, with the tenacity of the blade sufficiently compensating for the brittleness of the cutting edge. .

The present invention was developed in view of these points, and in a blade in which the blade body is made of a metal with high toughness among the cutting blade and blade body that constitute the blade; Both of the body are made of sintered cemented carbide, the cutting blade is made of a layer of cemented carbide, which has high hardness among cemented carbide, and the blade body is made of a layer of cemented carbide, which has high toughness, The cutting edge and the blade body are characterized by being constructed as a double layer of sintered cemented carbide whose interface is integrated when they are sintered. Among cemented carbide, we made it a material with higher hardness to further increase its wear resistance.In addition, when we originally increased this wear resistance, the brittleness also increased proportionally. However, despite this increased wear resistance, the objective is to provide a cemented carbide blade that avoids brittleness, and in particular, the interface is integrated when sintered, without simply joining the cutting edge and the blade body. By using a double layer of sintered alloy on the cutting edge and the blade body, the blade body firmly supports the cutting blade, making it possible to compensate for the brittleness of the cutting blade. The purpose is to make it easy to process.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows an example of a blade consisting of a cutting edge 2 and a blade body 3. In the present invention, the cutting edge 2 is formed of a layer of hardened cemented carbide, and the blade body 3 is made of a hard and durable layer. , it is formed of a layer of cemented carbide with high toughness, and is not simply an adhesive bonding of the hard layer of the cutting blade 2 and the high toughness layer of the blade body 3. , using a double-layer cemented carbide obtained by sintering, in which a layer rich in hardness forming the cutting edge 2 and a layer rich in toughness forming the blade body 3 are integrated,
As a result of sintering, an intermediate layer with no continuous interface is formed between the hard layer of the cutting blade 2 and the tough layer of the cutting body 3.

As an example of the above blade, HRA91 or higher,
For example, the cutting edge 2 is formed using extremely hard cemented carbide of HRA91 or HRA91.5, and the transverse rupture force is 230 kg/
^For example, the blade body 3 may be formed using an extremely strong and tough cemented carbide of mm ^{2 or more, for example 230 Kg/mm 2} or 250 Kg/mm ² , and the above sintered cemented carbide may be used as an example. In addition to tungsten carbide, titanium carbide may be used.

Furthermore, in the above example, the blade is made of the sintered double-layered cemented carbide itself, but the entire sintered cemented carbide blade 1 consisting of the cutting edge 2 and the blade body 3 may be joined to, for example, a steel handle. ,
You can use it as a blade.

As described above, the cutting blade 2 is made of a layer of cemented carbide with high hardness, and the blade body 3 is made of a layer of cemented carbide with high toughness that is integrally connected to the layer of cemented carbide with high hardness.
The blade is made of sintered double layer cemented carbide,
Abrasion resistant and tough (tenacity) at the same time
It has the following.

That is, since the cutting edge 2 of the blade of the present invention is made of cemented carbide, which has an extremely high hardness value among cemented carbide alloys,
It does not wear out easily and has better wear resistance. And if the hardness is even greater,
The brittleness increases proportionally, making it easier to break, but in the case of the present invention, the blade body 3 is integrally connected to the cutting blade 2, and the blade body 3 is a layer of extremely tough cemented carbide. , compensate for the increased fragility mentioned above,
It exhibits strength and has a high resistance to impact when using the blade, so it will not break. If the cutting edge is made of a layer of cemented carbide with high toughness, wear cannot be kept small, but as mentioned above, the cutting edge 2 is made of a layer of cemented carbide with high hardness, so it is resistant to wear. It is abrasive.

However, since the cutting blade 2 and the blade body 3 are integrated to the extent that there is no interface when sintered, the blade body 3 compensates for the fragility of the cutting blade 2 with its firmness, and its manufacturing process is This can be easily carried out as it only requires sintering.

[Brief explanation of drawings]

The attached drawings show an embodiment of the present invention, and FIG. 1 is an example of a blade, and FIG. 2 is a partial cross-sectional view of the double layer cemented carbide obtained by sintering that constitutes the blade. is a blade,
2 is a cutting edge, and 3 is a blade body.

Claims (1)

[Scope of utility model registration request] In a blade in which the blade 3 of the cutting blade 2 and blade body 3 that constitute the blade 1 is made of a metal with high toughness; both the cutting blade 2 and the blade body 3 are made of sintered carbide. The cutting blade 2 is made of an alloy and is connected to the blade body 3 of the highly tough cemented carbide. 3 is a blade characterized in that when these are sintered, the interface is formed as a double layer of sintered cemented carbide that is integrated.