JPH068442B2 - Molding equipment for fine powder molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention, in the production of parts for obtaining a product by molding and sintering fine powder of metal or non-metal, finely powders the molding material and The present invention relates to a molding device for a fine powder molded product that is molded by applying pressure in a molding die.

[Conventional technology]

A device for manufacturing parts that obtains products by pressing fine metal powder or non-metal fine powder mixed with it in a molding die and taking out the fine powder molded product from the mold and sintering Are known. The product thus obtained is porous and is widely used in various fields because it has features such as no need for cutting.

In particular, in the case of ceramics using ultrafine powder such as Al ₂ O ₃ , the demand for IC parts and parts for precision machines has been increasing in recent years.

In the manufacture of this kind of parts, conventionally, metal powder crushed by mechanical crushing, physicochemical methods such as reduction method, electrolysis method, etc. is filled in a molding die, and this is pressed or pressed with water pressure. A method has been adopted in which after pressurizing and molding, the fine powder molded product is taken out of the mold and sintered in a sintering furnace.

[Problems to be Solved by the Invention]

By the way, in the case of molding a fine powder molded product before sintering in manufacturing the required parts by molding and sintering the fine powder as described above, the fine powder as described above is filled in the mold, and this state Although it is molded by pressing with a press or water pressure at this time, the transmission of the pressing pressure tends to be non-uniform during this molding, the molded product becomes inhomogeneous and the quality of the sintered body deteriorates There was a problem that was damaged.

Such problems often occur when the molding material is insufficiently pulverized or the pulverized fine powder cannot be efficiently introduced into the molding die for molding.

Furthermore, in the conventional manufacturing apparatus, the above-mentioned fine powdering apparatus for finely forming the fine powder from the molding material, and the molding die for filling and solidifying the fine powder to perform molding are separately installed, and once. It is general that the finely divided fine powder material is taken out of the apparatus and then filled in a mold to be solidified, and the following problems are unavoidable.

That is, in the case of pulverized metal powder, for example, metal magnesium, surface activation comes out, and when it is exposed to the air, it causes a problem when performing solidification for filling the mold. .

Further, as described above, since the pulverization process and the molding process by filling and solidifying the mold are separately performed, there is also a problem that the molding cycle becomes long and the processing efficiency cannot be improved. It is hoped that some measures will be taken to clear the points.

The present invention has been made in view of the above points,
It is an object of the present invention to provide a molding apparatus for a new fine powder molded product, which makes it possible to obtain a molded product having uniform properties with high efficiency and in a short time.

[Means for Solving the Problems]

In order to meet such a demand, the apparatus for molding a fine powder molded article according to the present invention is a pulverization chamber that circulates a molding material together with a hard fluid pulverizing medium in a spiral to pulverize it and a pulverization chamber into which the fine powder is fed. It is equipped with a tower and a molding die that is integrally connected to the diffusion chamber of the crushing tower and is used for filling and solidifying the fine powder. The upper collision plate and the dish-shaped lower collision plate installed at the lower part of the crushing tower at a predetermined distance from the upper collision plate, the raw material supply port for supplying the molding material onto the lower collision plate, and the central portion of the lower collision plate. It is composed of a nozzle connected to an air blower that opens in an upward state and blows up the molding material with jet air to generate a spiral circulation flow between the upper and lower collision plates, and The inner surface of the cavity is lined with a perforated plate Together connect in the mold to a vacuum device, which is constituted so as to fill solidified in by suction fines pressurized state of the diffusion chamber in the depressurized mold in the vacuum apparatus.

[Action]

According to the present invention, the molding material supplied into the grinding chamber of the grinding tower and the hard fluidized grinding medium are circulated spirally by the jet air in the grinding chamber, whereby the molding material is rubbed with the hard fluidized grinding medium and ground. It is pulverized by collision with the outdoor wall. Further, at this time, since the pressure inside the molding die provided integrally with the crushing tower is reduced by the vacuum device, the finely divided molding material is sucked into the mold due to the pressure difference, and then the inner wall surface thereof is sucked. It is filled and solidified in a pressed state where it is pressed. The fine powder molded product taken out of the mold is sent to the sintering process.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

1 and 2 show an embodiment of a molding apparatus for a fine powder molded article according to the present invention. FIG. 1 is a schematic configuration diagram of the molding apparatus, and FIG. 2 is a molding powder for a fine powder molded article. It is a longitudinal cross-sectional view showing the details of the mold.

In these figures, reference numeral 1 denotes a crushing tower formed in a closed cylindrical shape, and a middle-higher part thereof is formed in an umbrella shape having a diameter smaller than that of the crushing tower 1, and a molding material to be described later is hard-flowed under the umbrella shape. An upper collision plate 2 for generating a vortex flow for circulating the crushing medium is installed, and the vortex flow described above is generated in the lower part of the crushing tower 1 in cooperation with the collision plate 2 on the state side. A lower collision plate 3 formed in a dish shape is installed.

A diffusion chamber 4 and a crushing chamber 5 are formed above and below the upper collision plate 2 as a boundary, and a valve 6 is provided at the center of the lower end of the crushing chamber 5 by the lower collision plate 3. A nozzle 9 connected to the blower 8 by a pipe 7 is opened upward. Further, the grinding chamber 5 has a wear resistance of, for example, diamond or superhard steel of 0.5 m.
A fluidized pulverizing medium having a diameter of about m is put in, and the molding material can be pulverized by friction with the supplied molding material.

On the outer wall of the crushing chamber 9, a raw material supply port 10 for supplying, for example, a powder of Al ₂ O ₃ as a molding material is opened at the peripheral portion of the lower collision plate 3.

On the other hand, above the crushing tower 1, a plurality of molds 11 are provided integrally connected to the diffusion chamber 4 by a pipe 13 having a valve 12. As shown in FIG. 2, each of these molds 11 is formed in a half-divided shape having a cavity 14 of the same shape as the molded product, and is clamped by a normal mold clamping, mold opening device, bolts, or the like. Is configured. A perforated plate 15 is lined on the inner surface of the cavity 14.

Reference numeral 16 is a dust removing device connected to each mold 11 by a pipe 17, and a vacuum pump 18 is provided with a pipe 19 for removing the dust.
And is configured to suck air in the mold 11 to remove dust and then discharge the air to the outside of the machine.

A molding method by the molding apparatus for a fine powder molded product having the above configuration will be described below.

That is, after applying a mold release agent such as a polyimide alcohol solution to the inner surface of the perforated plate 15 with a plurality of molds 11 having a cavity 14 of the same shape as the fine powder molded product, piping between the crushing tower 1 and the dust removing device 16 A fluidized grinding medium having a diameter of about 0.5 mm and having wear resistance, such as diamond or superhard steel, is placed in the grinding chamber 5 and connected with each other.

Then, after the powder of Al ₂ O ₃ as a molding material is supplied from the raw material supply port 10, the blower 8 and the vacuum pump 18 are started, and the air ejected from the nozzle 9 is indicated by an arrow A in the figure. As shown in the drawing, a spiral circulation flow is generated by alternately colliding with the upper and lower collision plates 2 and 3, and the air in the moldable mold 11 is sucked by the vacuum pump 18. As a result, for example, Al ₂ O ₃ powder and diamond grains are circulated spirally in the crushing chamber 5 together with the jet air, causing friction due to mutual collision and the upper and lower collision plates 2, 2.
The Al ₂ O ₃ powder is pulverized to 1 μm or less by collision with the wall surface of the crushing chamber 5 including 3 and the like. And, this fine powder is the collision plate 2
Is raised in the diffusion chamber 4 from the surroundings, is sucked into the mold 11 together with air, and is filled in the mold 11 in a pressurized state so as to be pressed against the perforated plate 15 due to the reduced pressure in the mold 11. By being solidified, a molded product is molded in the cavity 14.

On the other hand, the air discharged from the mold 11 is discharged to the outside of the machine after the dust is removed by the dust removing device 16.

Further, after the molding, the mold 11 is divided into half and an unsintered molded product is taken out and sintered in a sintering furnace to obtain an Al ₂ O ₃ ceramic product.

In addition, although the powder of Al ₂ O ₃ is exemplified as the molding material in the present embodiment, other metal powder may be used, or non-metal powder may be mixed.

〔The invention's effect〕

As described above, according to the molding apparatus for a finely powdered molded product according to the present invention, the molding material and the hard fluidized grinding medium supplied into the grinding chamber of the grinding tower are circulated as a swirl flow by the jet air in the grinding chamber to form the molding material. Is pulverized by friction with a hard fluid pulverizing medium and collision with the crushing chamber wall surface, upper and lower collision plates, and this fine powder is decompressed by a vacuum device arranged integrally in communication with the diffusion chamber of the pulverizing tower. Since it is designed to be sucked into the molding die and then filled and solidified under pressure, the molding material is finely powdered and finely powdered and solidified despite the simple structure. Molding process can be performed in series, and efficient pulverization in the pulverization chamber of the pulverization tower and uniform filling and solidification of fine powder in the molding die are possible, resulting in a homogenized pulverized product and improving product quality. Can be improved and in a short time Form cycle is complete and the productivity is improved.

In particular, according to the present invention, the pulverization tower having a pulverization chamber as a molding device and a molding die that is connected to the pulverization tower and performs molding by filling and solidifying the fine powder are made into a series of fine particles. Without taking the material out of the equipment, it can be sucked into the mold in a sealed state and filled and solidified.For example, finely divided metal powder such as metal magnesium shows surface activity and becomes solid in the air. When exposed to water, there is an advantage that the problem of absorbing the water and causing deterioration is prevented, and the fine metal powder can be easily and appropriately molded.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a molding apparatus for a fine powder molded product according to the present invention, and FIG. 2 is an enlarged vertical sectional view showing a molding die for a fine powder molded product. 1 ... Grinding tower, 2, 3 ... Upper and lower collision plates, 4 ... Diffusion chamber, 5 ... Grinding chamber, 7 ... Piping, 8 ... Blower, 9 ...
... Nozzle, 10 ... Raw material supply port, 11 ... Mold for molding,
12 ... valve, 13 ... piping, 14 ... cavity,
15 ... Perforated plate, 16 ... Dust removing device, 17 ... Piping, 18 ... Vacuum pump, 19 ... Piping.

Claims (1)

[Claims] 1. A pulverizing chamber which circulates a molding material together with a hard fluid pulverizing medium in a spiral shape to pulverize it by collision with a wall surface and friction between the molding material and the hard fluid pulverizing medium, and a fine powder pulverized in the pulverizing chamber. Is provided with a pulverization tower consisting of a diffusion chamber and a diffusion die of the pulverization tower, which is provided integrally in communication with the diffusion chamber, and is provided with a molding die for performing a molding process by filling and solidifying the fine powder. , A small-diameter umbrella-shaped upper collision plate erected in the high-middle part of the crushing tower and a dish-shaped lower collision plate erected at the lower part of the crushing tower with a predetermined interval therebetween, and a molding material on the lower collision plate And a raw material supply port for supplying the above-mentioned material to the central part of the lower collision plate, which is opened upward and blows up the molding material by the blowing air to generate a spiral circulation flow between the upper and lower collision plates. Consists of a nozzle connected to a blower The inner surface of the cavity of the molding die is lined with a perforated plate and is connected to a vacuum device. The vacuum device depressurizes and sucks the fine powder of the diffusion chamber into the die. A molding apparatus for a fine powder molded product, which is configured to be filled and solidified in a state.