JPS61506A - Manufacture of rod-shaped body of composite sintered material - Google Patents

Abstract

PURPOSE:To obtain a slender rod-shaped body of a composite sintered material whose head part and supporting part are cemented with a body by charging the first material layer for a hard sintered body and the second material layer to be cemented with the first material layer into a container, and hot-pressing at high temps. and high pressure. CONSTITUTION:The first material layer for a hard sintered body contg. >=50% diamond powder or high pressure-phase boron nitride powder and the second material layer of a hard alloy to be cemented with the first layer are charged one upon another in the pressing direction into a hot-press container. The first material is sintered by hot pressing, and the obtained hard sintered body is cemented with the second material layer to form a composite material block. The block is fixed to a wire cut electric spark machine and cut, and >=2 slender columnar composite material body having thickness 1/6 times the original thickness and having a cross section having <=3mm. equivalent diameter are cut out. A rod-shaped body of a composite sintered material for drills, etc. wherein a sintered CBN layer is fixed to one end of the supporting part of a hard alloy is obtained in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for producing composite rods, preferably small diameter cylinders, with rigid heads.

More specifically, the present invention provides a small device comprising a hard head such as a diamond sintered body or a high-pressure phase boron nitride sintered body, and a support part formed integrally with the head and made of, for example, a cemented carbide. (Relating to a manufacturing method of a cross-sectional composite material rod-shaped body.

The composite rod-shaped body obtained by the manufacturing method of the present invention can be used as a material for a high-performance small-diameter drill or as a head for a dot printer.

BACKGROUND OF THE INVENTION Drills made of cemented carbide are widely used for drilling holes in metal and non-metallic materials. In particular, cemented carbide drills with a diameter of around 1 mm are used for drilling holes in printed circuit boards, a demand for which has been growing rapidly in recent years.

Various materials are used for printed circuit boards, but the main one used is a reinforced resin made by impregnating glass fiber with epoxy resin, which is generally referred to as a glass-epoxy board.

Drilling of such printed circuit boards is usually done using a highly rigid drill at a rotation speed of 50,000 to 60,000 rpm, but the glass fibers contained in the board wear out the carbide tool very quickly, A carbide drill reaches the end of its lifespan after 3,000 to 5,000 hits (hits refers to the number of holes drilled). These drill machines are equipped with an automatic tool changer, and the drill that has reached the end of its service life is automatically replaced, but the time required for automatic tool change is also an issue in order to improve production efficiency.
There is a strong desire to extend drill life and eliminate tool change calls, ie, reduce tool change time.

Looking at the characteristics of printed circuit boards, there is a strong demand for higher functionality by further improving heat resistance, etc., and although it is actually possible to manufacture such board materials, it is generally difficult to produce such high-performance materials. Due to cutting, the life of conventional cemented carbide drills is extremely short, and the reality is that this substrate material cannot be put to practical use.

Furthermore, it is desired to increase the rotational speed of the drilling drill in order to drill even more efficiently into ordinary glass epoxy substrates, but this also means that the lifespan of conventional cemented carbide drills rapidly decreases as the cutting speed increases. Since this decreases, high efficiency cannot be achieved from this point of view.

On the other hand, sintered diamond tools, whose usage has been rapidly increasing in recent years, are significantly harder and more wear resistant than carbide tools, and are extremely useful when cutting the reinforced resins mentioned above. Demonstrates high performance.

However, as shown in FIG. 1, this sintered diamond tool is made of a composite sintered body 13 in which a sintered diamond layer 11 is bonded to a support portion 12 of cemented carbide.

When manufacturing a drill using this composite sintered body 13, the composite sintered body 13 must be fixed to the tip of the shank 15 by some method as shown in FIG.

However, the diameter of the tip of this drill is about 1 mm, and if a drill with such a small diameter does not have a very strong joint strength with the shank 15, the joint 16 will be damaged by grinding the cutting edge after joining.
The drill will fall off, making it impossible to manufacture a good drill. In particular, sintered diamonds are chick-ground and have high grinding resistance.
Normal silver brazing is not strong enough. For example, electron beam welding can be considered as a bonding method with high bonding strength, but if electron beam welding were to be implemented, the drill manufacturing process would be complicated and the cost would be high, making it difficult to meet the rapid increase in demand for high-performance drills in recent years. There wasn't.

In order to strengthen the connection with the shank 15 and improve the cutting performance of the drill itself, it is ideal if the entire tip of the drill is made of cemented carbide, and the head part has a hard sintered body such as diamond. It is.

For this purpose, an elongated composite rod made of cemented carbide with a hard head is required. However, with the conventional techniques, it has not been possible to manufacture a composite sintered body with such a small cross section and a large axial length.

In other words, when manufacturing a product with a large axial length relative to its cross-sectional area, even if powder material is pressed in the axial direction and hot pressed, the pressure loss due to the powder material layer is large, and the required axial center portion is This is because no pressure is applied and a strong sintered body cannot be obtained.

If this is further pressurized in the axial direction to perform high-pressure hot pressing, the pressure distribution inside the hot press container will become extremely irregular, making it easy to buckle or bend. A: A sintered body cannot be obtained.

Therefore, in hot pressing of a long and narrow sintered material, the sintered material is laid down so that the axial direction of the sintered material is perpendicular to the pressing direction. Even when a long and narrow composite material is hot-pressed using this method, the pressure in the direction perpendicular to the interface between different material layers is small, and a sufficiently strong bond between the material layers cannot be obtained.

OBJECT OF THE INVENTION The present invention aims to solve the problems of the prior art described above, and more specifically, the present invention has a head made of a hard sintered body, and the head and the support part are integrated by sintering. The purpose of the present invention is to provide a method for manufacturing a joined rod-like body of a composite material having a small cross section and an elongated shape, preferably a cylindrical body having a small diameter, so that a drill having excellent wear resistance and rigidity can be easily and inexpensively manufactured therefrom. shall be.

A further object of the present invention is to provide a long-life drill at a low price that can easily and efficiently drill holes in difficult-to-cut substrates such as glass epoxy substrates.

Furthermore, it is an object of the present invention to provide a method for manufacturing a composite material rod-shaped body with a small cross section as an intermediate product that can easily manufacture an elongated member that requires a hard tip, such as a head of a dot printer. .

Structure of the Invention The present inventors manufactured a composite sintered body block by hot pressing a composite material block with a large cross-sectional area, and then cut this into a small diameter cylindrical body using electric discharge wire cutting. , succeeded in providing a rod-shaped composite sintered material having a hard head.

That is, according to the present invention, a first material layer for a hard sintered body containing 50% or more of diamond powder or high-pressure phase boron nitride powder; The hard sintered body and the second material layer to be joined are stacked in the same hot press container in the pressing direction, and hot pressed under high temperature and high pressure to sinter the first material layer. The obtained hard sintered body is joined to the second material layer side to form a composite material block having a layer of hard sintered body with a predetermined thickness, and the composite material block is subjected to an electric discharge wire cutting method. Cut the material in the thickness direction by
115 with respect to the material layer thickness direction thickness of the composite material block
Provided is a method for manufacturing an elongated composite material rod, which comprises cutting two or more elongated composite material rods having a cross section with an equivalent diameter of 3 mm or less and having a hard sintered body at the head. be done.

When hot pressing and sintering the composite material, according to the present invention, the axial length of the composite material block is equal to the equivalent diameter DB.
3 times, preferably 2 times or less. If a composite material block with an axial length exceeding three times is hot-pressed, the pressure distribution within the composite material block will become irregular, resulting in bending or the like. In this specification, equivalent diameter means a value converted to the diameter of a circle having the same cross-sectional area.

The average particle size of the diamond powder or high-pressure phase boron nitride powder is preferably 30 μm or less, and a composite sintered material with excellent wear resistance and rigidity can be obtained with a diamond or high-pressure phase boron nitride sintered body having a particle size in this range.

However, when making cutting tool tips using diamond powder, if diamond powder with an average particle size exceeding 10 μm is used as a raw material, the cutting edge of the cutting tool will be formed by processing this composite sintered material cylindrical body. The hard sintered part cannot be formed sharply and therefore does not have high performance.
Preferably, it is made of sub-μm diamond or high-pressure phase boron nitride.

According to a preferred feature of the invention, the axial length of the hard sintered portion is between 0.3 and 2 mm.

When the first material layer is mainly composed of diamond powder, it may be made of diamond powder alone or a mixed powder containing 70% or more of diamond and a binder powder containing Fe, Co, or N1 as the main component. be. A preferred example of the first material layer of diamond powder is a mixed powder of 70% or more diamond powder and WC-5 to 15% Co powder.

In addition, when using diamond powder alone as the material of the first material layer, sintering 1 of the first material layer
Sintering of the first material layer is sometimes achieved by infiltrating the binder component in the second material layer into the first material layer powder.

When the first material layer is high-pressure phase boron nitride-based, high-pressure phase boron nitride powder alone or 40% or more of high-pressure phase boron nitride powder is used.
There are sintered materials in which carbides, nitrides, carbonitrides of group a, 5a, and 6a elements, and aluminum and/or silicon are added as binders.

Here, high-pressure phase boron nitride is cubic. Means crystalline boron nitride and wurtzite boron nitride.

The second material layer forming the support portion is made of a so-called cemented carbide, that is, a carbide, nitride, carbonitride, boride, silicide, or mutual solid solution carbide of an element of group 4a, 5a, or 6a of the periodic table. These are sintered alloys or cermets bonded with Re5Co or N1 iron group metals, or their powder raw materials. An example of cermet is (Mo, w)
There is one in which C carbide is bonded with N1 or Co, an iron group metal.

Furthermore, as another second material layer, W is 80 to 98% by weight.
There is a sintered alloy called a so-called heavy metal in which the remainder is Ni-Fe or N1-Fe-Co, or its powder raw material.

The second material layer may be a solid cemented carbide that has already been sintered, or may be a powder of a cemented carbide material. However, considering handling convenience during hot pressing and ease of applying high pressure, it is preferable to use a sintered cemented carbide block.

One of the important features of the method for manufacturing a composite rod-shaped body of the present invention is that the hard sintered part and the support part are joined during the sintering process of the hard sintered part. Therefore, the components of the second material layer are:
The material needs to be capable of bonding with the first material layer during the sintering process of the first material layer.

However, within the range of the components of the hard sintered part and the support part mentioned above, there are infinite combinations, and in the sintering process of diamond or high-pressure phase boron nitride by hot pressing under high pressure and high temperature, the above-mentioned combinations are possible. As such, the ferrous metal binding material in the support member is infiltrated and the hard sintered part and the support part are easily joined. Therefore, it goes without saying that those skilled in the art can select the components of the hard sintered part and the supporting part as needed within the above-mentioned range. Further, the high-pressure phase boron nitride powder can be sintered alone as described above, and the connection with the support part is achieved during the sintering process.

Furthermore, according to one aspect of the present invention, hot pressing is performed with an intermediate bonding layer having a thickness of 0.5 mm or less disposed between the first material layer and the second material layer.

The intermediate bonding layer is made of less than 70% high-pressure phase boron nitride and the remainder is one of carbides, nitrides, carbonitrides, or borides of Ti, Zr, or Hf in group 4a of the periodic table, or a mixture thereof, or a mixture thereof. It is preferable to use a compound mainly composed of a solid solution compound and a compound containing 0.1% by weight or more of AI and/or Si.

Furthermore, according to one aspect of the invention, the second material layer, ie the support section, is comprised of two or more material layers in the axial direction. As one such example, the supporting side layer of the second material layer is WC-Co, and the hard head side layer is (Mo,
w) There are cermets in which carbon carbide is bonded with iron group metals such as Ni or Co.

Furthermore, the first material layer is placed above and below the second material layer, hot-pressed, and the resulting composite material block is cut into a rod-shaped body with a small cross section in the coaxial direction, and hard heads are formed at both the upper and lower ends. It is also possible to manufacture a rod-shaped body having

Next, the shape of the composite sintered material rod obtained by the manufacturing method of the present invention will be explained.

The attached FIGS. 3(a) and 3(b) are perspective views of examples of composite rod-shaped bodies obtained by the manufacturing method of the present invention.

The rod-shaped composite sintered material shown in FIG. 3(a) has a cylindrical shape as a whole, and the hard sintered part 21 is directly joined to the support part 22.

On the other hand, in the composite sintered material rod-shaped body shown in FIG. 3(b), the hard sintered part 21 and the support part 22 are joined via the intermediate joining layer 24.

However, the composite material rod-shaped body obtained by the manufacturing method of the present invention is not limited to the cylindrical shape, but may of course be prismatic.

(The rod-shaped composite sintered material obtained by the method of the present invention has a diameter of 3 mm.
The following is a cross section with the equivalent diameter. Composite material rods having a cross section with an equivalent diameter of more than 3 mm are unsuitable as materials for drilling holes in printed circuit boards, and even if they are ground for use, the grinding allowance becomes large and uneconomical.

Moreover, the length of the hard sintered part 21 in the axial direction is 0.3 to 2II.
Iil range. If it is less than 0.3 mm, no improvement in cutting performance can be expected when used as the tip of a drill.
If the length exceeds 2+++ m, a large amount of expensive diamond powder etc. will be used, which is uneconomical.

Moreover, rod-shaped bodies having a diameter exceeding 3 mm can be manufactured by conventional methods other than the method of the present invention.

Furthermore, the length of the support part 22 needs to be five times or more the length of the hard sintered part 21. When manufacturing a drill, it is necessary to ensure the length of the face of the drill and embed the end in the shank, so as described above, a support portion that is five times or more long is required.

Next, FIG. 4 shows an example in which the composite material rod obtained by the manufacturing method of the present invention is applied to a drill.

As shown in FIG. 4(a), a hole 26 having the same diameter as that of the composite material rod (in the illustrated example, a cylinder) is bored at the tip of the shank 25 of the drill. The supporting portion side end of the composite material rod-shaped body 23 is pushed into this hole 26 and fixed.

At this time, brazing material may be dripped into the hole 26 and brazed.

As shown in FIG. 4(a), the composite material rod-shaped body 23 fixed to the shank was machined to have a cutting edge, thereby obtaining a drill as shown in FIG. 4(b).

To explain the method of cutting out the composite material rod shown in FIGS. 3 and 4, the composite sintered body block 33 obtained by hot pressing as described above is as shown in FIG. 5(a).
It consists of a diamond sintered body layer 31 with a thickness of 1 mm and a cemented carbide layer 32 bonded thereto, and when an intermediate bonding layer is included, the diamond sintered body layer 31 and the cemented carbide layer 32 are bonded to the diamond sintered body layer 31 as shown in FIG. 5(b). It is bonded to layer 32 via an intermediate bonding layer.

Although the illustrated example shows a cylindrical composite sintered body block, it goes without saying that the composite sintered body block may be a cylindrical body or a prismatic body.

As shown in Fig. 6, these composite sintered blocks were cut into rod-shaped bodies with an equivalent diameter of 3 mm or less in the coaxial direction of the composite sintered blocks using the electric discharge wire cutting method. b) Cut into composite rods with hard heads as shown in FIG.

In this electric discharge wire cutting method, a high voltage is applied between a wire and a composite sintered block, and the wire is run under tension to cut the block.The details are described in U.S. Patent No. 4.103. See No. 137.

Hereinafter, the manufacturing method of the present invention will be explained with reference to Examples. However, these Examples are merely illustrative of the present invention, and do not limit the scope of the present invention.

In this specification, unless otherwise specified, percentages are expressed as volume percentages.

Example 1 WCl with an outer diameter of 18 mm, an inner diameter of 14 mm, and a height of 15 mm.
2%C.

Cemented carbide ring, outer diameter 14mm, height 12mm WC
-12%Co cemented carbide cylindrical block, outer diameter 14mm
, consisting of a 0.5 mm thick WC-12% Co cemented carbide disk, 85% diamond powder with a grain size of 0.5 μm, and the remainder WC-15% Co cemented carbide powder with a grain size of 0.5 μm or less. A mixed powder was prepared.

A superalloy cylindrical block is inserted into the inner diameter of the superalloy ring, and the mixed diamond powder is filled into a recess with a diameter of 14 mm and a depth of 3 mm formed by the inner surface of the cemented carbide ring and the upper surface of the cemented carbide cylindrical block. Press to reduce the height of the mixed powder by 1
．． After setting the thickness to 5 μm and covering it with a cemented carbide disk, it was placed in an ultra-high pressure sintering device, and sintered for 15 minutes at a pressure of 55 kb and a temperature of 1370° C. After cooling, the upper cemented carbide disk of the enclosure was removed by depressurization and removed by grinding, and a 1 mm thick sintered diamond layer was bonded to the top surface of the 12 mm high cemented carbide support, forming a layer around it. A composite block was obtained in which the cemented carbide ring was also bonded to the support and to the sintered diamond layer.

As shown in Fig. 6, this composite block is
Attach it to an electric wire cutting machine and perform electric wire cutting to create a diameter of 1 mm from the axial direction of the composite block.
mm, a round bar with a length of 13 mm, and the support part is WC-12%C.
.

A rod-shaped body made of cemented carbide and having a 1 mm long sintered diamond layer fixedly formed on one end thereof was obtained.

Example 2 ■Outer diameter 18 each made of WC-12%Co cemented carbide
mm, inner diameter 14mm, height 20mm ring, outer diameter 14mm.

A cylindrical block with a height of 18 + n + n, ■ A disk with an outer diameter of 14 mm and a thickness of 0.5 mm, and a mixed powder consisting of 90% diamond powder with a particle size of 3 μm and the remainder being Co powder, with a particle size of 3 μm.
A mixed powder consisting of 60% high-pressure phase boron nitride (hereinafter cubic boron nitride will be abbreviated as CBN) powder and the balance (TiN - 10% by weight) was prepared.

After applying a solution of the CBN mixed powder in a solvent to a thickness of 50 μm on the top surface of a cemented carbide cylindrical block, the solvent was removed by heating, and the cemented carbide cylindrical block subjected to this treatment was adjusted to the inside diameter of the cemented carbide ring. inserted into.

Next, after filling the recess formed by the inner surface of the cemented carbide ring and the upper surface of the cemented carbide cylindrical block coated with the CBN mixed powder, the diamond mixed powder was press-molded to a thickness of 19.8 mm. After forming the diamond mixed powder layer of
It was covered with a cemented carbide disc.

Next, this container was placed in an ultra-high pressure sintering device, and the pressure was 55k.
b. After sintering at a temperature of 1400°C for 10 minutes, cooling;
The pressure was reduced and the container was taken out. When the upper cemented carbide disk of the container is removed by grinding, a sintered diamond layer with a thickness of 1.2 mm is bonded to the top surface of the cemented carbide support with a height of 18 mm via a sintered CBN layer with a thickness of 25 μm. A composite block was obtained in which a cemented carbide ring was bonded to a support and a sintered diamond layer.

This composite block was mounted on an electric discharge wire cutting and processing machine, and the supporting body part was a round bar with a diameter of 2 mm and a length of 19.2 mm from the axial direction of the composite body by electric discharge wire cutting.
- Made of 42% Co cemented carbide, with a length of 1.2 mm at one end.
Sintered CBN with a thickness of 25 μm and a sintered diamond layer of mm
A rod-shaped body was obtained which was bonded through an interface layer.

Example 3 (Mo7, W3) Made of C-11%Co cemented carbide,
Cylindrical block 07 with an outer diameter of 24 mm and a height of 25 mm, with a circular recess of 20 mm in diameter and 3 mm in depth on the top surface, outer diameter of 20 m
m, a diamond consisting of a 0.5 mm thick WCl 2% Co cemented carbide disk, 80% diamond powder with a grain size of 0.5 μm, and the remainder WC-15% Co cemented carbide powder with a grain size of 0.5 μm or less. A mixed powder was prepared.

This diamond mixed powder was filled into the recess on the upper surface of the cemented carbide cylindrical block and then pressed to form a diamond mixed powder layer with a height of 2.3 mm. Next, after covering this with a cemented carbide disk, it was placed in an ultra-high pressure sintering device, and the pressure was 55k.
b. Sintered at a temperature of 1400°C for 15 minutes.

After sintering, the enclosure was taken out and the cemented carbide lid on the top surface was ground and removed to reveal a sintered diamond layer with a thickness of 1.5 mm in the circular recess on the top surface.
A composite block was obtained that was firmly bonded to the 1% Co alloy container.

This composite block was mounted on an electric discharge wire cutting machine, and the support part was cut from the axial direction of the composite block using a round bar with a diameter of 21'nm and a length of 23.5mm (Mo2, W3)C- A rod-shaped body made of 11% Co cemented carbide and having a 1.5 mm long sintered diamond layer fixedly formed on one end thereof was obtained.

Example 4 WC with an outer diameter of 18 mm, an inner diameter of 14 mm, and a height of 15 mm.
-12%Co cemented carbide ring, outer diameter 14mm, height 1
2 mm cylindrical block made of 96 wt% W-3 wt% Ni-1 wt% Cu alloy, outer diameter 14 mm, thickness 0.5 m
m WC-12% Co cemented carbide disk and CB with grain size 3 μm
N85% and the remainder TlN0. After mixing l12 powder and ^1 powder at a weight ratio of 80:20, it was heated at 1000℃ for 30 minutes.
A mixed CBN powder consisting of a powder crushed to 0.3 μm was prepared after bottle processing in a vacuum furnace.

A W alloy cylindrical block is inserted into the inner diameter of the cemented carbide ring, and the CB is inserted into a recess with a diameter of 14 mm and a depth of 3 mm formed by the inner surface of the cemented carbide ring and the upper surface of the W alloy cylindrical block.
N mixed powder was filled and pressurized to form a CBN mixed powder layer with a height of 1.7 mm. Next, a cemented carbide disk is placed on the lid, and the entire cemented carbide container is placed in an ultra-high pressure sintering device, after which the pressure is 50 kb and the temperature is 1.
Sintering was performed at 250°C for 20 minutes.

After sintering, take out the cemented carbide container and remove the WC-12% on the top surface.
When the Co cemented carbide lid is ground and removed, a 1 mm thick sintered CBN layer is bonded to the top surface of the 12 mm high W alloy support, and a cemented carbide ring is placed around the support and the sintered CB.
A composite block bonded to the N layer was obtained.

This composite block was mounted on an electrical discharge wire cutting machine, and the supporting part was cut from the axial direction of the composite block using a round bar with a diameter of 1 mm and a length of 13 mm, which was 96% W-3% N1-1. A rod-shaped body made of a Cu alloy with a length of 1 mm and a sintered CBN fixedly formed on one end thereof was obtained.

Example 5 WC-1 with an outer diameter of 40 mm, an inner diameter of 36 mm, and a height of 40 mm.
2%Co cemented carbide ring, outer diameter 36mm, height 34mm
WC-12%Co cemented carbide cylindrical block, outer diameter 36m
A CBN mixed powder consisting of a WC-12% Co cemented carbide disk having a thickness of 0.5 mm and a CBN powder having a particle size of 3 μm and a composition of 6 μm was prepared.

First, the CBN mixed powder was made into a diameter of 36 mm and a thickness of 2. 5mm
1. A cemented carbide disc, a CBN molded body, a cemented carbide cylindrical block, a CBN molded body, and a cemented carbide disc are stacked on the inner diameter of the cemented carbide ring in this order from the bottom. ,
The entire set container was placed in an ultra-high pressure sintering device and sintered at a pressure of 40 kt and a temperature of 1200° C. for 20 minutes.

When taken out after sintering and the upper and lower cemented carbide lids were ground and removed, a diameter of 36 mm was formed on the upper and lower surfaces of the 34 mm high cemented carbide cylindrical block.
A sintered CBN layer with a thickness of 1.5 mm and a thickness of 1.5 mm is firmly formed.
Furthermore, a composite block was obtained whose periphery was covered with a cemented carbide ring.

Next, this composite block is mounted on an electric discharge wire cutting machine, and the diameter of the composite block is 2 mm from the axial direction by electric discharge wire cutting. A sintered CBN layer of 1.5 mm in length was fixedly formed on both ends of a round bar of 5 mm in length and 37 mm in length.

By further cutting this round bar into two parts at the center in the length direction, it becomes a round bar with a diameter of 2.5 mm and a length of 18 mm, and the support part is WC.
A rod-shaped body made of -12% Co cemented carbide and having a sintered CBN layer with a length of 1.5 mm fixedly formed on one end was obtained.

[Brief explanation of the drawing]

The "brush" figure shows the structure of a conventional composite diamond sintered body. FIG. 2 shows a drill in which a conventional composite sintered body is fixed to the cutting edge. FIGS. 3(a) and 3(5) respectively show examples of composite sintered material rods manufactured by the method of the present invention. FIG. 4(a) illustrates a method of making a drill using a composite material rod obtained by the method of the present invention, and FIG. 4(a) shows the drill. FIG. 5(a) shows an example of a composite material block obtained according to the method of the invention, and FIG. 5(b) shows an example of a composite material block with an intermediate joint. FIG. 6 shows the location of cutting out rods from a block of composite material according to the invention. (Main reference numbers) 11...Sintered diamond layer of conventional diamond tool, 12...Cemented carbide support part, 13...Conventional composite sintered diamond tip, 15...Shank , 21... Hard sintered part of the composite sintered material rod-shaped body by the method of the present invention, 22... Supporting part, 23... Composite sintered material rod-shaped body of the present invention, 24... Intermediate joint part, 31... Hard sintered part of composite material block, 32... Support part, 33...
...Composite material block, 34...Intermediate joint, Patent applicant Sumitomo Electric Industries Co., Ltd. Agent Masahiko Arai (αn (b) Figure 6 Procedural amendment (voluntary) July 4, 1985 1, Indication of the case 1985 Patent Application No. 120219 2, Name of the invention Method for manufacturing composite sintered material rod-shaped body 3 , Relationship with the case of the person making the amendment Patent applicant address 5-15 Kitahama, Higashi-ku, Osaka Name (21
3) Sumitomo Electric Industries Co., Ltd. 4, Agent address: 1-10-76 Higashikanda, Chiyoda-ku, Tokyo 101
, Date of amendment order (voluntary) 7. Subject of amendment (1) Claims column of the specification (
2) Column 8 of the detailed description of the invention in the specification, contents of amendment (1), and claims are amended as shown in the attached sheet. (2), “1” stated on page 10, lines 4 to 6 of the specification.
15 or less and..." is corrected to "the head is equipped with a hard sintered body having a cross section with an equivalent diameter of 1/6 or less and 3 mm or less." Claims (1) A first material layer for a hard sintered body containing 50% or more of diamond powder or high-pressure phase boron nitride powder;
In the sintering process of the first material layer, the hard sintered body of the first material and the second material layer to be bonded are stacked in the pressing direction in the same hot press container, and are heated at high temperature and high pressure. The first material layer is sintered by hot pressing at the bottom, and the obtained hard sintered body is joined to the second material layer to form a hard sintered body layer with a predetermined thickness. A composite material block is formed, and the composite material block is cut in the material layer thickness direction by an electric discharge wire cutting method, and the thickness is equal to or less than 1/6 of the material layer thickness direction of the composite material block and 3 mm or less. A method for producing an elongated composite material rod-like body, which comprises cutting two or more elongated composite material cylinders each having a hard sintered body at the head with a diameter cross section. (2) The method for producing an elongated composite material rod according to claim 1, wherein the diamond powder or high-pressure phase boron nitride powder in the hard sintered part has an average particle size of 30 μm or less. (3) The method for manufacturing a slender composite material rod according to claim 1, wherein the diamond powder or high-pressure phase boron nitride powder in the hard sintered part has an average particle size of 10 μm or less. (4) The second material layer is made of materials from periodic table 4a, 5a,
6. The elongated composite material rod shape according to any one of claims 1 to 3, which is a cemented carbide made by bonding carbides of Group A elements or their mutual solid solution carbides with iron group metals. How the body is manufactured. (5) The second material layer contains 80 to 98% by weight of W, with the remainder being an alloy of Ni-Fe or Ni-Pe-Cu. 4. A method for producing an elongated composite material rod according to any one of Item 3. (6) The first material layer and the second material layer are pressed by disposing an intermediate bonding layer having a thickness of approximately 5 mm or less. Items 1 to 5
A method for producing an elongated composite material rod according to any one of Items 1 to 3.

Claims (6)

[Claims] (1) Diamond powder or high pressure phase boron nitride powder
The first material layer for the hard sintered body containing 0% or more and the second material layer bonded to the hard sintered body of the first material in the sintering process of the first material layer are the same. The first material layer is sintered by hot pressing under high temperature and high pressure, and the obtained hard sintered body is placed in the second material layer. A composite material block having a layer of hard sintered body having a predetermined thickness is formed by joining the sides, and the composite material block is cut in the thickness direction of the material layer by an electric discharge wire cutting method to determine the material of the composite material block. It is characterized by cutting two or more elongated composite material rods having a cross section with an equivalent diameter of 1/5 or less of the thickness in the layer thickness direction and 3 mm or less, and having a hard sintered body at the head. A method for manufacturing an elongated composite material rod. (2) The method for producing an elongated composite material rod according to claim 1, wherein the diamond powder or high-pressure phase boron nitride powder in the hard sintered part has an average particle size of 30 μm or less. (3) The method for manufacturing a slender composite material rod according to claim 1, wherein the diamond powder or high-pressure phase boron nitride powder in the hard sintered part has an average particle size of 10 μm or less. (4) The second material layer is made of materials 4a, 5a, and 6 of the periodic table.
The elongated composite material rod shape according to any one of claims 1 to 3, which is a cemented carbide made by bonding carbides of Group A elements or their mutual solid solution carbides with iron group metals. How the body is manufactured. (5) The second material layer contains 80 to 98% by weight of W, with the remainder being an alloy of Ni-Fe or Ni-Fe-Cu. 4. A method for producing an elongated composite material rod according to any one of Item 3. (6) Hot pressing is performed by disposing an intermediate bonding layer having a thickness of 0.5 mm or less between the first material layer and the second material layer, as claimed in claim 1. 6. A method for producing an elongated composite material rod according to any one of items 5 to 5.