JP2000038603A - Production of sintered product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a sintered product using high m.p. metal whose forming is hard by diecasting and precision casting and capable of producing parts having a thin part. SOLUTION: Fishing tackle and the like including reels and lure parts are produced by subjecting metal, ceramics or the mixture thereof to injection molding. Then, by removing at least water from the molded body obtd. by the injection molding, a grown body is obtd., the brown body is subjected to debinder treatment, and, moreover, the brown body subjected to the debinder treatment is sintered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sintered product for producing parts such as fishing tackles such as reels or lure parts by injection molding metal, ceramic powder or a mixture thereof.

[0002]

2. Description of the Related Art Hitherto, as a method of manufacturing a fishing tackle including a reel and a lure part, a manufacturing method by die casting or precision casting has been used.

[0003]

However, in the conventional die casting, a high melting point metal such as Ti has not been industrially possible because there is no mold capable of withstanding high temperatures.

[0004] In precision casting, a high melting point metal such as Ti can be formed. However, when a thin portion having a thickness of 1 mm or less is used, casting is difficult and casting defects such as pinholes are caused. But the finish skin was bad. Furthermore, Ti
In the case of difficult-to-grind materials such as those described above, there is a problem that the finishing cost is required because the gate must be ground.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is intended to use a high melting point metal which is difficult to be formed by die casting and precision casting, and to produce a part such as a fishing tackle having a thin portion. It is an object of the present invention to provide a method for manufacturing a sintered product that can be manufactured.

[0006]

According to the present invention, there is provided a method for producing a sintered product, comprising: an injection molding step of molding a material selected from the group consisting of metals, ceramics and mixtures thereof into a predetermined shape by injection molding. It is characterized by having.

In the method of manufacturing a sintered product, the metal may be, for example, Ti, Ti alloy, stainless steel, Al, Al
Alloy, Cu, Cu alloy, W and W alloy, wherein the ceramic is TiC, S
one selected from the group consisting of iC, alumina, zirconia and magnesia.

In this case, a binder composed of agar and water or a binder composed of a thermoplastic and a wax is added to a material selected from the group consisting of the above-mentioned metals, ceramics and mixtures thereof, and the composition for molding is added. It is preferable to use

Further, in the method for producing a sintered product, a brown body is obtained by removing at least moisture from the obtained molded body, the brown body is subjected to binder removal, and the brown body subjected to binder removal is fired. It is preferable to tie.

The thickness of the sintered product is 0.2 mm to 2.0 mm.
mm, and a part or all of the sintered product may have a hollow structure.

Further, in the injection molding step, a material different from a material selected from the group consisting of metal, ceramics and a mixture thereof for the main body is simultaneously injection-molded to form a composite of the two materials, and the other main body is formed on the main body. The member may be configured to be integrally molded.

Further, the sintered product may be a fishing tackle component.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a sintered product according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a flowchart showing a method of manufacturing a sintered product according to the present embodiment in the order of steps, and FIG. 2 is a sectional view showing a kneading apparatus. In the present embodiment, the metal and ceramic used as raw materials are powders obtained by a gas atomization method, a water atomization method, or a high-pressure water atomization method.

For kneading, a kneading apparatus as shown in FIG. 2 is used. The kneading apparatus includes a kneading tank 1, a pressure lid 2, and two kneader blades 3,3. The kneading tank 1 has a mixing chamber 4 in which the inside is hollow with a bottom. The mixing room 4
The bottom part is divided into two substantially semi-cylindrical parts, and kneader blades 3 and 3 of an appropriate shape are arranged in parallel in each part. The two kneader blades 3, 3 rotate in directions different from each other, whereby the substances in the mixing tank 1 are mixed and kneaded. In addition, the mixing tank 1 has a double-walled and bottom structure. By supplying water or steam to the internal space, the temperature inside the mixing chamber 4 is adjusted and maintained at a predetermined value. It is configured to be able to. The pressure lid 2 seals the mixing tank 1 and the mixing tank 1
It is configured so that the internal pressure can be adjusted and maintained at a predetermined value.

In order to perform kneading, first, either a metal or ceramic powder or a mixed powder thereof is added to a binder and kneaded by a kneading apparatus to obtain a molding composition.

The binder is obtained by dissolving agar in water. Specifically, 15 to 35 parts, preferably 20 parts, of agar is added to 100 parts of water (parts by weight, hereinafter the same).
~ 30 parts are dissolved. Agar is a substance extracted from seaweed that is generally called "agar", but its main component is agarose, and other impurities are collectively called agaropectin. Agar is soluble in warm water, and its aqueous solution becomes a sol-like viscous liquid at 90 to 96 ° C.
When cooled to 35 to 45 ° C. or less, it gels and shrinks in volume to become an elastic fixed substance. This gel point is not significantly affected by the concentration of agar.

Further, an alcohol may be further added to a binder composed of agar and water. As the alcohols, one or more of ethanol, methanol, isopropyl alcohol, 2,3-dibromopropanol and the like are used. The alcohols increase the gel strength of the agar in the gel state. When adding alcohols, it is preferable to use 5 to 30 parts of alcohols per 100 parts of water. If the alcohol is less than 5 parts, the effect of increasing the gel strength is insufficient, and if it exceeds 30 parts, the gel strength starts to decrease.

Next, the molding composition is granulated and pelletized.

The pellets are injected into an injection molding machine, the injection molding temperature is set to a temperature at which the binder maintains a sol state, and injection molding is performed to form a molded article having a desired shape.

The molded body is cooled to room temperature, the binder becomes a gel, and the shape is maintained. And the thing of this state is called a green body.

The water and alcohols contained in the binder of the compact are heated gradually from room temperature to 100 to 1
By removing water and alcohols at 50 ° C., a dry brown body is obtained. And what removed water and alcohols from a molded object is called a brown body.

Since the brown body has a moderately good hardness, it can be easily machined as required by various processing machines in this state, and can be thinned or holed as desired. Additional shapes can be added.

The brown body is heated to 200 to 400 ° C., and a binder and a part of the water-soluble polymer are thermally decomposed and removed to remove the binder.

After the binder is removed, the product is heated to a temperature of 1100 to 1500 ° C. in a heating furnace under a vacuum or an inert gas atmosphere and heated and sintered to obtain a product having a desired shape. When the brown body is not processed, heating for drying the green body and heating for removing the binder may be continued. Further, even when the brown body is processed, heating of the binder removal and heating for sintering may be continuously performed.

According to the present embodiment, a powder of metal, ceramics or a mixture thereof is kneaded with a binder and injection molded to obtain a molded body. The molded body is processed into an arbitrary shape in a state of a brown body from which moisture has been removed. afterwards,
A product having a desired shape is obtained through a binder removal process and a sintering process.

According to this embodiment, the binder is made of agar and water. However, the present invention is not limited to this. The binder may be made of a thermoplastic and a wax.

According to the present embodiment, it is preferable that the metal or ceramic is a true spherical fine powder which has been subjected to a surface treatment.

Next, a fishing tackle which can be manufactured by the method of the embodiment of the present invention will be described. FIG. 3 shows a rotor section 8 of a reel 5 as a first application example, and FIG.
FIG. 1 is a side view of a reel according to a first embodiment of the present invention,
(B) is a perspective view of a rotor portion of the reel.

The reel 5 has a foot 6, a rotor 8, and a spool 12. The rotor portion 8 is formed into a thin cylinder 9 having a thickness t of 0.2 to 2.0 mm by processing a brown body. Thereafter, through a binder removal process and a sintering process, a product having a desired shape is obtained in the processed brown body shape.

According to this embodiment, since the brown body can be processed by various processing machines, a thin fishing tackle can be formed. In addition, the material can be appropriately selected to enhance the weather resistance.

Next, as a second application example of the present invention, a fishing tackle manufactured by the method of the embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same components as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 is a front view showing the foot 6 of the reel 5 of this application example. The foot 6 has a hollow portion 7. A foot 6 having a hollow portion 7 is formed by processing a brown body. Then, through a binder removal process and a sintering process, a product having a desired shape is obtained. By processing into a desired shape, the foot 6 having the hollow portion 7 is formed without using a core.

According to this embodiment, the brown body is a hollow product 7
The core can be made unnecessary by processing into a shape having Therefore, it is possible to form a component having the hollow portion 7 which has been conventionally formed using a core by casting.

Next, as a third application example of the present invention, a fishing tackle manufactured by the method of the embodiment of the present invention will be described with reference to FIG. 5, the same components as those in FIG. 3 are denoted by the same reference numerals, and the detailed description thereof will be omitted.

FIG. 5 is a perspective view of a rotor portion of a reel according to a third application example of the present invention. In this embodiment, the rotor section 8 is formed by combining different metals. In this embodiment, W or W alloy different from the base material is insert-injection-molded as balance weights 10 and 11 on the side surfaces of the thin cylinder 9 of the rotor portion 8 to obtain a brown body.
By processing this brown body with various processing machines, the rotor portion 8 of the reel 1 is formed.

According to the present embodiment, it is possible to appropriately arrange the materials according to the functions. That is, if W or W alloy is applied as the balance weights 10 and 11 to the rotating body such as the rotor unit 8 of the reel 1, the rotational runout can be suppressed, and
The moment of inertia can be adjusted.

Next, as a fourth application example of the present invention, a fishing tackle manufactured by the method of the embodiment of the present invention will be described with reference to FIG. 6, the same components as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 6 is a perspective view of a spool of a reel according to a fourth application example of the present invention. The spool 12 has a base 13
And a tip portion 14. The base 13 and the tip 14 are integrally injection-molded from two different materials to obtain a brown body. The spool 12 of the reel 1 is formed by processing the brown body by various processing machines. In this case, the tip portion 14 is formed of SiC in order to improve wear resistance.

According to this embodiment, if the material corresponding to the function can be appropriately arranged and SiC or ZrO ₂ which is excellent in wear resistance is applied to the tip portion 14 of the spool 12 in which abrasion is severe, the spool can be provided. 12 can also be extended.

According to the present embodiment, the distal end portion 14 of the spool 12 is integrally formed with the spool 12 by injection molding. However, the present invention is not limited to this, and the base portion 13 and the distal end portion 14 of the spool 12 may be formed by composite molding. Can also.

According to the above-described embodiment, the brown body is formed by forming and hollowing into a thin cylinder 9; however, the processing of the brown body is not limited to this, and mechanical processing such as drilling or grinding is performed. Processing can be performed.

Further, according to the above embodiment, the present invention is applied to the reel 5, but it is needless to say that the present invention is applicable to lure parts or other fishing tools. In addition to the fishing tackle, the present invention can be applied to ski hardware, bicycle gear, leisure equipment, and the like.

Further, according to the above embodiment, the influence on the environment can be reduced by using W or W alloy as the material of the weight of the fishing tackle.

[0044]

According to the present invention, a fishing tackle having a high melting point metal which is difficult by die casting and a thin product which is difficult by precision casting can be manufactured.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a method of manufacturing a fishing tackle in the order of steps.

FIG. 2 is a sectional view showing a kneading device.

FIG. 3A is a side view of a reel according to a first application example of the present invention, and FIG. 3B is a perspective view of a rotor portion of the reel.

FIG. 4 is a front view showing a foot portion of a reel according to a second application example of the present invention.

FIG. 5 is a perspective view showing a rotor portion of a reel according to a third application example of the present invention.

FIG. 6 is a perspective view showing a rotor portion of a reel according to a fourth application example of the present invention.

[Explanation of symbols]

1; kneading tank, 2; pressure lid, 3; kneader blade,
4; mixing room; 5; reel; 6; foot; 7; hollow; 8; rotor; 9; circular cylinder; 10, 11; balance weight; 12; spool;
4; tip; t; wall thickness

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 35/00 C04B 35/00 X 35/632 108 F-term (Reference) 2B107 BA70 4G030 AA07 AA17 AA36 AA45 AA47 CA07 GA14 GA21 PA21 4K018 AA03 AA06 AA14 AA19 AA33 AB01 AB02 CA07 CA08 CA09 CA29 DA01 DA03 HA10 JA02 KA70

Claims (8)

[Claims] 1. A method for producing a sintered product, comprising an injection molding step of molding a material selected from the group consisting of metals, ceramics and mixtures thereof into a predetermined shape by injection molding. 2. The metal is selected from the group consisting of Ti, Ti alloy, stainless steel, Al, Al alloy, Cu, Cu alloy, W and W alloy, and the ceramic is TiC, SiC, alumina. The method for producing a sintered product according to claim 1, wherein the method is selected from the group consisting of zirconia and magnesia. 3. A molding composition by adding a binder consisting of agar and water or a binder consisting of a thermoplastic and a wax to a material selected from the group consisting of the metal, ceramics and a mixture thereof. The method for producing a sintered product according to claim 1 or 2, wherein: 4. After the injection molding step, at least water is removed from the obtained molded body to obtain a brown body, the brown body is subjected to binder removal processing, and the brown body subjected to binder removal processing is sintered. The method for producing a sintered product according to any one of claims 1 to 3, wherein: 5. The method for producing a sintered product according to claim 1, wherein the thickness of at least a part of the sintered product is 0.2 mm to 2.0 mm. . 6. The method for producing a sintered product according to claim 1, wherein a part or all of the sintered product has a hollow structure. 7. The injection molding step, wherein a material different from a material selected from the group consisting of metal, ceramics, and a mixture thereof for the main body is simultaneously injection-molded, and both materials are composite-molded, and another main body is formed on the main body. The method for producing a sintered product according to any one of claims 1 to 6, wherein the member is integrally molded. 8. The method according to claim 1, wherein the sintered product is a fishing tackle component.