JPS61144229A - Manufacture of super corrosion-resistant composite-alloy tool - Google Patents

Abstract

PURPOSE:To obtain a super corrosion-resistant and high-toughness composite-alloy tool by providing prescribed hot hydrostatic extrusion and hot equidirectional press- working to a core stock of hard material covered with an outer-periphery stock of tough material, before heat-treating it through plastic working and outer-shape working. CONSTITUTION:A bar-shaped member formed by covering a core stock 2 consisting of hard material with an outer-periphery stock 3 of tough material is heated to a prescribed temperature in a furnace of inert-gas atmosphere, and is press-formed by hot extrusion with the aid of a die of sintered hard alloy. The obtained bar-shaped composite alloy is provided with hot equidirectional press-working in a vacuum Ar- atmosphere furnace under prescribed temperature, pressure and time to form the porous structure in the central part into a perfect close-packed one. The composite alloy provided with said workings are worked into a micropunch 14, an ejector 15 and a microdrill 16, etc. through plastic working and shape working, and then they are finished into final products by heat-treating them. In this way, a composite alloy tool super in corrosion-resistance and excellent in toughness is manufactured.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention is applicable to tools having a diameter of 10 mrn or less, such as drills, punches, ejector turbines for engineering plastics, nesting pins, end mill cutters, cutting chip cutters, This invention relates to a method for manufacturing a super wear-resistant composite alloy tool for manufacturing reamers and the like.

"Prior Art" Conventionally, when manufacturing tools, a single piece of material such as high speed steel, carbide, cermet, etc. was formed into a predetermined tool shape by cutting, grinding, or other processing. For this reason, there were drawbacks as listed below.

(1) Powder alloys such as powdered HSS and powdered tungsten carbide are molded and sintered one by one, resulting in poor productivity, high processing time, and high costs.

(2) Since the entire structure is made of an expensive powder alloy, the material cost is high.

(3) Since the material is formed into a tool product, sintered, and processed into the specified shape by grinding or other machining processes, the toughness of the material is inherently low, so the higher the precision, the more likely it will break. .

``Object of the present invention'' In view of the above-mentioned drawbacks of the conventional products, the present invention provides a tool that is easy to process and has a hardness of HV 1 in the part that becomes the blade of the tool compared to conventional products.
To provide a method for manufacturing a super wear-resistant composite alloy tool that can be manufactured at low cost and has a wear resistance of 500 degrees or more, has a long life due to the use of tough members in parts that are subjected to rotational and vibration loads.

"Means for Achieving the Object of the Invention" The present invention consists of a core material and an outer material covering the outer periphery of the core material, both of which are made of a tough material and the other of which is made of a hard material. A rod-shaped member forming process in which a rod-shaped member is formed by hydraulic extrusion molding, and a hot isostatic pressing process in which the rod-shaped member formed in this rod-shaped member forming process is subjected to hot isostatic pressing to achieve a tissue density of 100%. process, a plastic working process in which the product that has gone through this hot isostatic pressing process is subjected to plastic working such as prescribed fire forging, roll rolling, wire drawing, etc. to make a tool product, and this plastic working process. It is characterized by including an external shape processing step in which the processed material is processed into a predetermined external shape by cutting, cutting, grinding, etc., and a heat treatment processing step in which the processed product is subjected to heat treatment.

"Embodiments of the present invention" The present invention will be described in detail below with reference to embodiments shown in the drawings.

In the embodiment shown in FIG. 1, 1 is a core material 2 made of a hard material, and the outer periphery of this core material 2 is covered with a cylindrical outer material 3 made of a tough material, which is then hot hydrostatically extruded. In the rod-shaped member forming process in which a rod-shaped member 4 is formed by molding, this rod-shaped member forming process 1 includes a composite process 5 in which the outer circumference of the core material 2 is covered with a cylindrical outer member 3; The composite rod-shaped member 4 is heated to 1000° C. or higher in a heating furnace with an inert gas atmosphere such as argon, and is extruded and pressure-molded using a carbide mold die 6 while applying a reduction with a cross-section reduction rate of 20% or more. , a composite alloy processing step 7 in which two or more types of 111 m of core material 2 and external material 3 are bonded and diffused and processed into a bar-shaped composite alloy 4A.

As the hard material used for the core material 2, for example, alloy tool steel, sintered high-speed steel, cermet alloy, nitride-containing sintered titanium alloy, etc. are used. The tough material used for the external member 3 includes, for example, martensitic stainless steel alloy, carbon tool steel, alloy tool steel, molybdenum-containing high-speed steel, structural alloy steel, and the like.

8 is a hot isostatic pressing step in which the rod-shaped composite alloy 4A formed in the rod-shaped member forming step 1 is subjected to hot isostatic pressing to bring the tissue density to 100%; In the processing step 8, the rod-shaped composite alloy 4A is subjected to hot isostatic pressing at 1000°C or higher and 1500 atm or higher for 15 minutes or more in a furnace 9 in a vacuum argon gas atmosphere, and during hot extrusion pressure forming processing. The porous structure in the center created by surface processing is made into a 100% dense structure.

Reference numeral 10 denotes a plastic working step in which a predetermined plastic working process such as artificial forging, roll rolling, wire drawing, etc. is performed to produce a tool product from the product that has passed through the hot isostatic pressing step 8.

11 is cutting the material that has undergone the plastic working step 10;
By grinding etc., a predetermined external shape, for example, Figs. 2 and 3
The micro punch 14 shown in the figure, the ejector turbine 15 shown in FIGS. 4 and 5 or 6 and 7.
15A1 Micro drill 16 shown in Figs. 8 and 9
This is an external shape processing process.

Reference numeral 12 denotes a heat treatment process in which the material that has passed through the external shape process 11 is heat treated, and this heat treatment process 12 is performed in a vacuum or argon gas atmosphere at 1180°C or higher in a heat treatment furnace for 1 minute per diameter 1cjI. After the temperature is maintained at 100°C to 120°C, a rapid cooling and quenching process 12A is performed in which the temperature is rapidly cooled and quenched, and the product that has gone through this rapid cooling and quenching process 12A is placed in a nitrogen gas atmosphere furnace for tempering, and heated at 500°C. ℃~600℃ for 60 minutes or more.

"Different Embodiments of the Invention Different Embodiments of the Invention"
One example will be explained. In the description of this embodiment, the same components as those in the embodiment of the present invention will be denoted by the same reference numerals and redundant explanation will be omitted.

In the embodiment shown in FIG. 10, the main difference from the embodiment of the present invention is a rod-shaped member 4, which has a core material 2A.
By using such a structure, the micro drill 18 shown in FIGS.
Alternatively, it can be processed into a bottle 19 as shown in FIGS. 13 and 14.

Note that the core material 2.2A and the outer material 3.3A may be formed into a plurality of layers.

"Effects of the Present Invention" As is clear from the above description, the present invention has the following effects.

(1) Since a tough material is used for either the core material or the outer material, and a hard material is used for the other, a tool with sufficient hardness and toughness can be obtained.

(2) By making the external material a tough material,
Compared to those that process hard materials, machining of the external shape is easier and productivity can be improved.

3) The material cost is low because either the core material or the external material is made of a tough material that is cheaper than a hard material.

(4) Costs can be reduced by the above (2) and (3).

[Brief explanation of the drawing]

Fig. 1 is a process diagram showing one embodiment of the present invention, Figs. 2 and 3 are explanatory diagrams of a micro punch, Figs. 4 and 5, and Figs. 6 and 7 are explanatory diagrams of an ejector turbine, respectively. Figures 8 and 9 are explanatory diagrams of the micro drill;
FIG. 10 is a process diagram showing different embodiments of the present invention, and FIG.
1 and 12 are explanatory diagrams of a micro drill, and FIGS. 13 and 14 are explanatory diagrams of a bottle. 1: Rod-shaped member forming process, 2.2A: Core material, 3.3A: External material, 4: Rod-shaped member, 4A: Composite alloy, 5:
Composite process, 6: Carbide mold die, 7: Composite alloy processing process, 8: Hot isostatic pressing process, 9: Inside the furnace, 10: l! 7 sex processing process, 11
: External shape processing step, 12: Heat treatment processing step, 12A:
Rapid cooling quenching process, 12B: Tempering process, 14: Micro punch, 15
．． 15A: Eject turbine, 16: Micro drill, 18: Micro drill, 19
:pin. Patent Applicant: Yoshikatsu Satoshi Fuji Figure 8 Figure 11 A Figure 13 A Figure 9 Figure 12 Simplified Figure 14

Claims (1)

[Scope of Claims] 1) A rod-shaped member formed by hot hydrostatic extrusion using a tough material for one of a core material and an external material covering the outer periphery of the core material and a hard material for the other. A rod-shaped member forming step in which the rod-shaped member is formed, a hot isostatic pressing step in which the rod-shaped member formed in this rod-shaped member forming step is subjected to hot isostatic pressing to achieve a tissue density of 100%, and this hot, etc. A plastic working process in which plastic working is performed on at least one of the prescribed processes such as fire forging, roll rolling, wire drawing, etc. in order to make a tool product from a product that has undergone a pressure working process, and this plastic working process. an external shape processing process in which the product that has undergone the above process is processed into a predetermined external shape by at least one or more processes such as cutting, cutting, grinding, etc.; and a heat treatment process in which the product that has undergone this external shape processing process is heat treated. A method for manufacturing a super wear-resistant composite alloy tool, comprising: 2) Claim 1, characterized in that martensitic stainless steel alloy, carbon tool steel, alloy tool steel, molybdenum-containing high-speed steel, structural alloy steel, etc. are used as the tough material. The method for manufacturing the super wear-resistant composite alloy tool described above. 3) Claim 1 or 2, characterized in that alloy tool steel, sintered high-speed steel, cermet alloy, nitride-containing titanium, sintered titanium alloy, etc. are used as the hard material.
A method for manufacturing a super wear-resistant composite alloy tool as described in . 4) The rod-shaped member forming process includes a composite process in which the outer periphery of the core material is covered with an external material, and the composite product in this composite process is heated for 10 minutes in a heating furnace in an inert gas atmosphere such as argon.
The material is heated to 00°C or higher and is extruded and pressure-formed using a carbide mold die while applying a reduction with a cross-section reduction rate of 20% or more to bond and diffuse the two or more structures of the core material and external material to form a composite alloy. A method for manufacturing a super wear-resistant composite alloy tool according to any one of claims 1 to 3, characterized in that the method comprises a composite alloy processing step of: 4) In the hot isostatic pressing process, the rod-shaped member that has undergone the rod-shaped member forming process is heated to 1000°C in a furnace in a vacuum argon gas atmosphere.
The above is subjected to hot isostatic pressing at 1500 atmospheres or more for 15 minutes or more to transform the porous structure in the center created by surface processing during hot extrusion pressure molding into a 100% dense structure. A method for manufacturing a super wear-resistant composite alloy tool according to any one of claims 1 to 4, characterized in that: 6) In the heat treatment process, the product that has undergone the external shape processing process is kept at a temperature of 1180℃ or higher in a vacuum or argon gas atmosphere for 1 minute per 1cm diameter in a heat treatment furnace, and then heated to 100℃ to 120℃. There is a rapid cooling and quenching process in which the product is rapidly cooled and quenched to a temperature of
6. The method for manufacturing a super wear-resistant composite alloy tool according to any one of claims 1 to 5, comprising a tempering step of holding at 0°C to 600°C for 60 minutes or more.