JPH0853701A - Material to be worked for metallic product and its production - Google Patents

Abstract

PURPOSE:To produce a material to be worked capable of obtaining a metallic product rich in uniqueness and having designability by kneading a metal powder and an aq. soln. of org. binder to obtain a clayey kneaded product, by forming the product into an optional shape by calcining the kneaded product an a specified temp. CONSTITUTION:A pure metal powder (Fe, Cu, Au, Ag, Pt, etc.) or a metal powder (having 5-100mum average grain diameter) consisting of one or more kinds of the alloy powder materials consisting essentially of the elements and an aq. soln. (about 5-6% concn.) of org. binder (methylcellulose, etc.) are kneaded to produce a clayey kneaded product, the product is formed into an optional shape, and the neaded product is calcined at 50-450 deg.C for 5-40min to obtain a stably formed material to be worked. The material is carved in a desired manner and sintered at a specified temp. to extremely easily obtain a metallic product rich in decorativeness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to precious metal jewelery, arts and crafts, interior decorations, tabletop decorations, etc. by sintering the surface of the metal after it has been sculpted or decorated. TECHNICAL FIELD The present invention relates to a processed material for a metal product which can be a metal product having a large craft factor and a method for manufacturing the same.

[0002]

[Prior Art] Conventionally, precious metal jewelry, arts and crafts,
Alternatively, in the case of an interior for construction or the like, if the shape is simple, press molding is used, but generally, the casting method is most often used. Among them, the lost wax casting method is a mainstream method although it is handled as a high-grade product because it has a great degree of freedom in design and can reproduce a complicated shape with high reliability.

However, the above-mentioned lost wax casting method requires a large amount of capital investment and requires a great deal of time to become skilled. The steps of this lost wax casting method are simply shown: prototype → split rubber mold → core molding (in the case of hollow) →
Press-fitting wax into the rubber mold including the core (wax mold) → Wax mold assembly → Mold making → Dewaxing → Mold baking → Metal melting → Pouring →
Disassembling the mold → cutting the sprue and runner → dissolving and removing the core → acid treatment → polishing → coloring → finished product, which requires a very long process (usually 7 days). In particular, the fixed cost has been increased due to problems such as shell molding, pollution problem of dewaxing firing, trouble of removing mold, facility for eliminating pollution of acid treatment, etc., but today no casting method superior to this is found.

On the other hand, there are mainly four sintering methods, namely, a pressure method, an injection molding method, a slurry method, and a clay hand-working method, but a clay-like molding material used in the clay hand-working method has already been developed. Has been marketed. This material has a particle size of 2 to 20 μm
It has a clay-like structure in which about 20% by weight of various binders such as methyl cellulose and ethyl cellulose, and water are added to the metal fine particles, and the process is prototype → rubber mold → sintering → polishing → coloring → completion. Since the number of steps is extremely smaller than that of the commercial product and the lost wax casting method, it is used as a method suitable for applications where shape and dimensional accuracy are not required.

[0005]

However, the above-mentioned clay-like molding material has the advantages that it is rich in plasticity, has high flexibility, and can be easily molded into an arbitrary shape. In such a case, it is necessary to devise a sticky material so that it does not adhere to the fingers, or does not deform when it is formed into a three-dimensional shape such as a ring shape or an annular shape. Also,
When finely engraving the surface of a molded product that was molded into an arbitrary shape, the surface had a caking property, so a sharp groove could not be formed, and even a craft designer could not perform a beautiful engraving. . Since the hardness is high when sintered and metallized, engraving, brazing, and bending could not be easily performed.

[0006]

The present invention was proposed in view of the above, and was obtained after kneading a metal powder consisting of one or more of pure metal powder and alloy powder and an aqueous solution of an organic binder. Clay-like kneaded product is molded into an arbitrary shape, 50-450 ℃
The present invention relates to a processing material for a metal product (hereinafter, simply referred to as a processing material) fired in 1. and a manufacturing method thereof.

The present inventor discloses the above clay-like kneaded material in Japanese Patent Application No. 5-112440 (filing date: April 2, 1993) as a method for producing a metal product having low shrinkability. Then, it is proposed to form this into an arbitrary shape and raise the temperature to the sintering temperature all at once to obtain the target metal product. The present invention is an improvement of the technology of this prior application in view of the above-mentioned problems, is suitable for users and has high practicality, and finally, like the invention of the prior application, is unique to the original invention of the user. The purpose is to produce (manufacture) a metal product having excellent design characteristics.

Therefore, the clay-like kneaded material used in the present invention is the same as that of the prior application. The metal powder used for the clay-like kneaded material is made of one or more of pure metal powder such as Fe, Cu, Au, Ag, and Pt and alloy powder containing these elements as a main component, and has an average particle diameter of 5 to 100 μm or less. It is preferable to use those of The organic binder is methylcellulose (MC), ethylcellulose (EC), etc., as described on page 819 of "Powder theory and application" (Maruzen Co., Ltd., published on August 10, 1973). The above cellulose derivative can be used, and it is particularly preferable to use a high molecular weight one showing a viscosity of 7,000 to 10,000 centipoise when the concentration of the aqueous solution is 5 to 6%.

The above-mentioned metal powder and the organic binder aqueous solution are kneaded to prepare a clay-like kneaded product. After kneading by mechanical stirring and stretching with a large pressure, if left for 24 hours or more. , Conventionally, in order to moisten the thin film of the organic binder aqueous solution so as to be wrapped around the metal particles (about 30% by weight of the organic binder aqueous solution is used).
Compared with the above, it is possible to impart plasticity and retain moldability even with an organic binder aqueous solution in an extremely small amount. Particularly, it is preferable to knead 95 to 92% by weight of the metal powder and 5 to 8% by weight of the organic binder aqueous solution in accordance with the prior application because a metal product having less shrinkability at the time of sintering can be obtained.

In the present invention, after the clay-like kneaded product is molded into a molded body having an arbitrary shape, the temperature is not raised to the sintering temperature all at once as in the previous application, but at 50 to 450 ° C. for about 5 to 40 minutes. Bake. By this firing, the water and the organic binder in the molded body are partially or entirely sublimated (vapor).
The above-mentioned molded body may be molded using a support. For example, in order to form a thin-walled cylindrical shape, a clay-like kneaded material may be coated around a cylindrical resin molded body or a metal cylinder and fired under the above conditions. At this time, if a resin molded body is used, it is needless to say that the firing may be performed at a temperature lower than the softening point of the resin.

The thus obtained processed material of the present invention maintains a stable shape without being deformed by its own weight or some external force even if it is thin, and the caking property of the clay-like kneaded product is lost. The surface becomes dry. Therefore, the user can easily and clearly engrave a desired line drawing or pattern on the surface of the processed material using a general-purpose carving knife or the like. After that, if this processing material is heated to the sintering temperature, a metal product (sintered body) whose surface is engraved by the user himself can be easily produced. The sintering temperature is usually set to a temperature 100 to 150 ° C. lower than the melting point of the metal powder used. In this case, since the user only needs to purchase the processing material having the predetermined shape, the user does not touch the clay-like kneaded material at all and does not stain the fingers.

Further, the user may press the clay-like kneaded material formed into a small decorative component on the surface of the processed material and then heat it to the sintering temperature to produce a metal product, Dilute the clay-like kneaded product into a slurry and draw (paint) the desired line drawing or pattern using a brush.
After that, the metal product may be manufactured by heating to the sintering temperature.
In these cases, the user needs to purchase a clay-like kneaded material or a diluted solution thereof together with a processing material of a predetermined shape, but it is possible to add a great variety of creativity as compared with the case where only the engraving is performed. , It is possible to produce metal products with extremely unique characteristics. For example, when a clay-like kneaded product or a liquid obtained by diluting the clay-like kneaded product with a metal powder (or mixed powder) having a different color from the metal powder (or mixed powder) used for the processing material is used, It is possible to produce a metal product in which metal parts having different colors are appropriately combined, and the metal product has an extremely high decorative effect. Since clay-like kneaded products or liquids obtained by diluting them into clay-like liquid may be used, stains on the fingers may occur, but compared to the case where all the articles are molded with clay-like kneaded products as in the previous application. The degree of pollution is extremely small.

The liquid obtained by diluting the clay-like kneaded product into a sludge can be used as an adhesive liquid when the clay-like kneaded product is pressure-bonded to the processed material, or as a correction liquid for correcting the engraving applied. It can also be used.

As described above, the processed material of the present invention serves as a foundation for producing a metal product, and it is extremely easy to produce a metal product with rich decorativeness, which has been difficult for a craft designer in the past. You can

[0015]

EXAMPLES Examples of the present invention will be shown below.

Example 1 70 g of a 6% aqueous solution of methyl cellulose (viscosity 7,000 centipoise) was added to 930 g of pure silver (Ag) powder having an average particle size of 3 to 25 μm, and the mixture was stirred, and subsequently stretched by a machine (roll). Knead. Next, after leaving this kneaded product in a closed container for 24 hours, it became clay-like and had a diameter of 15 mm and a length of 30 mm.
It is molded into a tubular shape, and silica powder is packed in the inside. Then, put it in a heating furnace at about 200 ° C.
Heat for ~ 20 minutes, remove and cool at room temperature, Example 1
To obtain the processed material. On the outer peripheral surface of the obtained processed material, a clay-like kneaded material formed into a strip shape with a width of 2 mm and a thickness of 1 mm was spirally wound, and the liquid obtained by diluting the kneaded material into a sludge was used with a brush or the like. Apply it to the joint part to make it adhere. Then, the sintering temperature (10% from the melting point of pure silver of 960 ° C)
The temperature is rapidly raised to a low temperature of 864 ° C ± 10 ° C), held at this temperature for 20 to 40 minutes, then taken out of the furnace and allowed to cool.
A metal product (sintered product) having excellent decorativeness could be produced.

Example 2 Pure silver (Ag) powder (50%) and pure gold (Au) powder (50) each having an average particle size of 10 μm.
%), And a clay-like kneaded product was prepared in the same manner as in Example 1 except that 50 g of a 6% aqueous solution of methyl cellulose (viscosity 7,000 poise) was added. Next, the kneaded product is molded into a hemispherical shape by packing it in a previously prepared 20φ silicone rubber hemispherical mold material and taking it out. Then, put it in a heating furnace at 150 ° C. for 10
Heat for 20 minutes and cool to obtain the processed material of Example 2.
A line drawing of a doll is engraved on the surface of the obtained processed material using a chisel. Then, after sintering at 850 ° C. for 30 minutes,
Blue silver ornaments could be made. In order to reduce the thickness, the kneaded product may be thinly applied to the mold material, or the adhering kneaded product may be excavated to an appropriate thickness, and it may not be performed if not necessary. The sintering time may be adjusted accordingly.

[Embodiment 3] Pure gold having an average particle size of 10 μm (A
u) A clay-like kneaded product was prepared in the same manner as in Example 1 except that 60 g of a 6% aqueous solution of methyl cellulose (viscosity 7,000 centipoise) was added to 940 g of the powder.
Next, this kneaded material is 20 mm wide × 50 mm long × 1 thick
It is formed into a flat plate of mm, and both ends thereof are bent toward the inner surface in a tubular shape (two places). And it is 150 ~
It is put in a heating furnace at 200 ° C., heated for 30 minutes, and cooled to obtain the processing material of Example 3. Two dolls are drawn by using a liquid obtained by diluting the kneaded material using the pure silver powder of Example 1 into a slurry in the obtained processed material. Then, at 800 ℃ 60
After sintering for a minute, it was possible to produce an ornament in which a silver doll was drawn on a gold base.

[Example 4] Pure silver (Ag) powder having an average particle size of 10 to 20 µm and 920 to 850 g of 6% aqueous solution of methyl cellulose (viscosity 7,000 centipoise) 80 to 1
A clay-like kneaded product was prepared in the same manner as in Example 1 except that 50 g was added. Next, this kneaded product is formed into a flat plate shape having a width of 20 mm, a length of 50 mm and a thickness of 1 mm, and both ends thereof are bent inward toward a tube (diameter 5 mmφ). Then, this is put in a heating furnace at 150 to 250 ° C., heated for 30 minutes, and cooled to obtain the processing material of Example 4.
On the upper surface of the tubular portion of the obtained processed material, a liquid obtained by diluting the above kneaded product into a sludge is applied at 5 points to form a dot. Also, a doll engraving is applied to the flat part of the processed material.
Then, by sintering at 820 ° C. for 30 minutes and further brazing the stopper plate, a brooch made of silver having excellent decorative properties could be manufactured.

[Embodiment 5] Pure gold having an average particle size of 5 μm (A
u) A clay-like kneaded product was prepared in the same manner as in Example 1 except that 50 g of a 6% aqueous solution of methyl cellulose (viscosity 7,000 centipoise) was added to 950 g of the powder.
Next, this kneaded material is 5 mm wide x 50 mm long x 2 m thick
m is formed into a thin linear shape, which is then bent into an annular shape to form a ring shape. Then, it is placed in a heating furnace at 250 to 300 ° C., heated for 10 minutes, and cooled to obtain the processing material of Example 5. At the center of the obtained processed material, pure gold (Au) powder (80%) and pure silver (A
g) A powder (20%) and a clay-like kneaded product obtained in accordance with Example 1 were used, and the width was 2 mm, the length was 30 mm, and the thickness was 1.
mm line and wrap. Also, on the adhesive part,
A liquid obtained by diluting the kneaded product of the pure gold powder into a slurry is applied with a brush. After that, when sintered at 850 to 900 ° C. for 30 minutes, a ring with a pure gold-colored bluish linear decoration could be produced.

[Embodiment 6] Methyl cellulose 6% to 950 g of pure silver (Ag) powder having an average particle diameter of 10 to 20 μm.
A clay-like kneaded product was prepared in the same manner as in Example 1 except that 50 g of an aqueous solution (viscosity 7,000 centipoise) was added. Next, this kneaded product is molded into a flat plate having a width of 30 mm, a length of 50 mm and a thickness of 2.5 mm, and is further bent into a cylindrical shape, and silica powder is packed inside to prevent deformation. . Then, heat it vertically (40
(0 ° C.), heated for 20 minutes, and cooled to obtain the processed material of Example 6. Average particle size of 1 on the surface of the obtained processed material
Pure silver (Ag) powder of 0 μm (70%) and average particle size of 10 m
The pure copper (Cu) powder (30%) and the clay-like kneaded product are spirally wound into a linear shape having a width of 2 mm, a length of 60 mm and a thickness of 1.5 mm. After that, when it was sintered at 800 ° C. for 30 minutes in a reducing atmosphere furnace, it was
It was possible to produce a pendant head that was decorated with a tinge of reddish silver wires.

[Embodiment 7] Pure gold having an average particle size of 5 μm (A
u) A clay-like kneaded product was prepared in the same manner as in Example 1 except that 50 g of a 6% aqueous solution of methyl cellulose (viscosity 7,000 centipoise) was added to 950 g of the powder.
Next, this kneaded product is molded into a hemispherical shape by packing it in a previously prepared silicone rubber hemispherical mold material and taking it out. Then, it is placed in a heating furnace at 250 ° C., heated for 10 minutes, and cooled to obtain the processing material of Example 7. A line drawing is applied to the surface of the obtained processed material with a chisel. Then 8
Sintering at 50 ° C. for 30 minutes made it possible to produce a pendant head having a hemispherical outer surface and inner surface with clear engraving.

[Embodiment 8] Platinum (P
t) A clay-like kneaded product was prepared in the same manner as in Example 1 except that 50 g of a 6% aqueous solution of methyl cellulose (viscosity 7,000 centipoise) was added to 950 g of the powder.
Next, this kneaded material is 2 mm wide x 50 mm long x 1 m thick
m, and bend it to form a ring. Then, it is placed in a heating furnace at 450 ° C., heated for 10 minutes, and cooled to obtain the processing material of Example 8. A line drawing is applied to the outer surface of the obtained processed material using a chisel. Then, by sintering at 1650 ° C. for 60 minutes, a Pt ring having a clear line drawing could be manufactured. Further, a ring can be similarly produced by using an alloy obtained by adding palladium (Pd) powder to the platinum powder.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-mentioned embodiments, and can be carried out in any manner as long as the configuration described in the claims is not changed. You can

[0025]

As described above, the processing material of the present invention is used for producing metal products such as precious metal jewelery, arts and crafts, interiors, and tabletop decorations, on the surface of which a general-purpose chisel or the like is used. Can be used to make a clear engraving, or a clay-like kneaded product containing metal powder can be pressed into a small decorative part, or a liquid obtained by diluting the kneaded product into a sludge form can be used. A desired line drawing or pattern can be drawn with a brush or the like, and then heated to the sintering temperature to produce a metal product having a unique design.

Therefore, the user can extremely easily give a clear design to the surface of the purchased processing material, and at that time, the user can work without soiling his / her fingers.

Claims (2)

[Claims] 1. After kneading a metal powder consisting of one or more of pure metal powder and alloy powder and an aqueous solution of an organic binder, the obtained clay-like kneaded product is molded into an arbitrary shape at 50 to 450 ° C. Processing material for fired metal products. 2. A clay-like kneaded product obtained by kneading metal powder consisting of one or more of pure metal powder and alloy powder and an organic binder aqueous solution is molded into an arbitrary shape at 50 to 450 ° C. A method of manufacturing a processed material for a metal product to be fired.