KR101277777B1 - Ingot manufacturing method using sintering - Google Patents

Abstract

PURPOSE: A method for manufacturing a sintered ingot is provided to facilitate the safe management and flexible operation of a manufacturing facility by forming pulverulent bodies at room temperature, thereby reducing energy consumption and environmental pollution. CONSTITUTION: A method for manufacturing a sintered ingot is as follows: a step of removing impurities from metal granular materials(10) and uniformly mixing the metal granular materials; a step of molding a pressed body(15) by inputting and pressing the metal granular materials in a mold(30); and a step for cooling the pressed body after the metal granular materials of the pressed body are fusion-welded in a continuous sintering furnace(60).

Description

Sintered ingot manufacturing method {INGOT MANUFACTURING METHOD USING SINTERING}

The present invention relates to a method for producing an ingot (ingot) used as a raw material of various metal products, the metal raw material granular material 10 is put into a mold (30) and compressed to form a compression molded body (15) After this, through the continuous sintering furnace 60 to induce fusion between the raw material granules 10, it is possible to manufacture the ingot 16 without the formation of molten metal (熔 湯).

Ingot (ingot) used as a raw material of various metal products is a kind of metal ingots having a constant shape and weight, and means ingots formed by melting a raw metal and then injecting it into a mold.

Ingots are used as raw materials and subsidiary materials for the manufacture of metal products, not as final finished products. They do not require strict specifications and strengths compared to metal finished products such as various machine parts and tools, but are distributed in bulk. Unlike raw materials, since it must maintain a certain shape and weight in the distribution process, it is usually manufactured as a metal cube in the form of a cube.

Such ingots are produced by heating the raw metal above the melting point to form a molten metal, pouring it into a sand mold or a mold, and cooling and demolding, as in the prior meaning of a synonym ingot.

Conventional ingots, or ingots, are manufactured by casting through the melting of raw metals, as described above.The raw metals are poured into crucibles, heated above the melting point to form molten metal, injected into sand molds or molds, and cooled. By hardening and demolding, a hexahedron shaped metal mass is completed. In the process of melting raw metal, enormous power or fuel is consumed, which increases manufacturing cost and causes severe environmental pollution, and also handles molten metal. Since it has to be complicated manufacturing process and safety management was difficult.

In addition, since the operation of the metal melting facility generally requires a lot of power or fuel that exceeds the amount of time required for normal operation at the time of restarting after a pause, and requires complicated preliminary work, casting of the ingot is inevitably performed continuously. Therefore, there was a problem in that it is impossible to operate a flexible facility according to demand.

In addition, molds or molds are generally used as molds in the manufacture of conventional casting ingots, and complicated processes are required in manufacturing, using, demolding, and reusing the molds, and many problems such as inadequate durability and increased manufacturing costs are caused. Is caused.

First, in the case of sand molds formed by embedding wooden molds or lead molds in molding sand molds, not only the sand molds must be manufactured at every ingot casting, but also the mold sands must be periodically replaced. There is a problem that the manufacturing efficiency is extremely low.

In addition, when the mold is applied, the ingot molding is adhered to the mold during the injection and cooling of the molten metal, so that it is difficult to separate the mold from the finished ingot, thereby applying mechanical vibration or impact to the mold. Of course, not only the mold is damaged, there is a problem that the manufacturing cost is increased due to the construction and operation costs of the related demolding equipment.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and in the method of manufacturing a metal ingot (16), a step of removing impurities in the metal raw material granules (10) and mixing them uniformly, and a manufacturing plan therein. Injecting and pressing the raw material granules 10 to the mold 30 having the recessed portion in the shape of the ingot 16 to form a compression molded body 15, and the compression molded body 15 is continuous It is a sintered ingot manufacturing method characterized in that the step of sintering the sintering furnace 60, followed by cooling.

In addition, the step of removing the impurities in the metal raw material granular material 10, a part of the raw material granular material 10 is put into the crusher 22 and pulverized into fine grains 11, and the impurities are removed Mixing the raw material granular material 10 and the fine granular material 11 and the raw material granular material 10 in a mold 30 in which a recess is formed in a shape of a manufacturing plan ingot 16 therein. And a step of adding and pressing the mixture of the fine grain granules 11 to form a compact 15, and inserting the compact 15 into a continuous sintering furnace 60, followed by sintering and cooling. Sintered ingot manufacturing method characterized by.

Through the present invention, not only can the manufacturing efficiency of the ingot 16 be significantly improved, but also the electric power or fuel can be significantly reduced as compared with the conventional casting method.

In addition, it is possible to form the powder at room temperature by removing the conventional high temperature molten metal molding, so it is easy to manage safety and elastic operation of the manufacturing facility, which can save energy and double the environmental pollution prevention effect. have.

In addition, by recycling by-products such as metal powder, cutting chips, scrap and sludge generated in the manufacturing process of various metal products as raw materials, it is possible to save resources and reduce waste disposal costs.

Brief Description of the Drawings Fig.
Figure 2 is an exploded perspective view of an embodiment of the mold of the present invention
3 is an exemplary view of a compression molded article of the present invention
Figure 4 is a process illustration of one embodiment of the present invention to which fine grains are applied

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory view showing the overall process of the present invention, and as shown, the present invention is first disclosed through the step of uniformly removing impurities in the metallic raw material granular material 10.

Here, the metallic raw material granular material 10 is a metallic granular material such as metal powder produced by pulverizing metal, as well as by-products generated during the manufacturing process of various metal products or pulverized products of waste metal products. Drying of cutting chips or metals generated during cutting, scrap generated during forging, rolling, injection, extrusion or welding after welding, and sludge generated after plating or etching processes Powder or the like may be applied.

Since these metal processing by-products may include various impurities such as nonmetallic contaminants and cutting oil, it is necessary to remove these impurities before full molding.

Impurities can be removed by washing the metal raw material granules 10 with water and drying them, or by performing magnetic screening or air flow screening. Since the matter can be selectively applied by those skilled in the art according to the impurity does not specifically limit the claims.

The raw material granules 10 from which impurities are removed are mixed into the stirrer or the mixer 21 to be uniformly mixed. Here, in the case of the raw material granules 10 composed of dissimilar metals, the homogeneous dissimilar metal particles are uniform. When the particle size is not constant even with the same metal, it refers to a process of stirring so that the large particle size granular material 10 is not biased to a specific site.

That is, in the mixing process of the present invention, mixing does not include a plurality of components for a specific purpose but means that stirring is performed for the purpose of uniformly maintaining the distribution state of the unit particles in the raw material granules.

On the other hand, during the sintering of the compression molded body 15 by imparting the binding force between the particles of the raw material granule 10 in the process of forming the compression molded body 15 through the injection and pressurization of the mold 30 of the raw material granule 10 to be described later A trace amount of a binder such as polyvinyl alcohol or starch may be added for the purpose of preventing collapse, and these binders are also added to the mixer 21 and stirred together with the raw material granules 10.

As such, the raw material granules 10 in which impurities are removed and mixed are injected into the mold 30 having the recesses formed in the shape of the manufacturing plan ingot 16 therein, and then pressurized to produce the production plan ingot 16. Compression molded body 15 of the same shape as the shape of the) is molded, the specific structure of such a press mold 30 and the molding method of the compression molded body 15 through it is shown in Figures 1 and 2.

2 shows a mold 30 and an accessory device for forming the compression molded product 15 applied to the present invention. As shown, the mold 30 of the present invention has the same shape as that of the manufacturing plan ingot 16. A high-strength metal enclosure having a recessed portion of the recess, the removable reaction plate 40 is coupled to the inner bottom of the recessed portion, and the pressing plate 50 having the same flat cross section as the recessed portion is coupled to the upper portion of the recessed portion. .

Further, the extraction pin 41 protrudes from the bottom surface of the reaction plate 40, and a pin coupling hole 31 is formed in the mold 30 to penetrate the bottom surface, thereby forming the mold 30 of the reaction plate 40. At the time of inner coupling, the extraction pin 41 has a structure that is accommodated in the pin coupling hole 31.

Through the mold 30 having such a structure, the compression molded body 15 of the raw material granular body 10 is molded as in the center portion of FIG. 1. The mold 30 is in the state in which the reaction force plate 40 is coupled to the mold 30. After inserting the raw material granular material 10 into the recessed part of the 30, and pressing the pressure plate 50 with the recessed part of the mold 30 to pressurize it at high pressure, the pressure plate 50 is withdrawn and the ejection pin 41 is removed. As shown in FIG. 3, the compression molded body 15 having the same shape as that of the manufacturing plan ingot 16 can be completed as shown in FIG. 3.

In this state, the compression molded body 15 is retained by the high pressure adhesion between particles of the raw material granules 10 or the adhesion through the above-described binder, and thus the structure is not collapsed. Then, the desired strength is achieved through fusion between the particles of the raw material granules 10 through sintering.

Sintering is to induce fusion between particles by heating metal particles below melting point, and is usually applied to the manufacture of tools requiring high hardness, and various additives are added and various atmosphere gases are injected during heating. Although a process is required, not only high strength or precision is required in the present invention, but also a close sintered fusion welding state leading to the deep part of the compression molded body 15 is not required, as shown in FIG. In order to ensure the compression molded body 15 to the continuous sintering furnace 60 to enable the continuous production of the ingot 16.

As the compression molded body 15 passes through the continuous sintering furnace 60, it is cooled and cured after sintering, thereby completing the ingot 16, and the finished ingot 16 can be cleaned without casting through complete melting of the raw metal. Not only the size and weight can be maintained, but also the basic molding process is performed through cold powder processing at room temperature, thereby greatly improving work convenience and efficiency.

On the other hand, Figure 4 is to artificially adjust the particle size distribution (금속 度 分布) of the metal granules to be processed by the compression molded body 15 to form a more dense structure, it will be described as follows.

First, as described above, the step of removing impurities in the metal raw material granular material 10 is performed once, and then, a part of the raw material granular material 10 is put into the grinder 22 to be pulverized into fine grains 11. do.

The grinding of the raw granular material 10 into the fine granular material 11 is not performed with respect to the total amount of the raw granular material 10, but is divided into portions, and as shown in FIG. Fine granular granules having a fine particle diameter are formed through the granulator 22 such as a charged ball mill. To 11).

As such, the fine granules 11 and the raw material granules 10 from which the impurities are removed are uniformly mixed by being introduced into the mixer 21 and stirred together, and then mixed into the mold 30 in the lower circle of FIG. 4. As in the enlarged portion, the fine grain 11 is bonded to the pores of the raw material granules 10 to form a dense structure.

The mixture of the raw granules 10 and the fine granules 11 injected into the recesses of the mold 30 is press-molded and then taken out to form the compact 15, after which the compact 15 is continuously sintered. The ingot 16 is completed by sintering, cooling, and hardening by being input into the furnace 60.

10: raw material grain
11: fine granular body
15:
16: Ingots
21: Mixer
22: grinder
30: Mold
31: pin coupler
40: reaction plate
41: blowout pin
50: pressure plate
60: continuous sintering furnace

Claims (2)

In a method for manufacturing a metal ingot (16)
Removing impurities in the metallic raw material granules 10 and mixing them uniformly;
Inserting and pressing the raw material granular material 10 into a mold 30 having a recessed portion formed in the shape of a manufacturing plan ingot 16 therein to form a compressed molded product 15;
Method for producing a sintered ingot, characterized in that the compression molding (15) to the continuous sintering furnace (60) to perform the fusion between the raw material granules (10) particles through sintering and to cool.
In a method for manufacturing a metal ingot (16)
Removing impurities in the metallic raw material granules (10);
Injecting a part of the raw material granular material (10) into the grinder (22) to grind the fine granular material (11);
Mixing the granular material (10) and the fine granular material (11) from which the impurities are removed;
The compression molded body 15 is pressurized by putting a mixture of the raw material granular body 10 and the fine grain granular body 11 into a mold 30 having a recessed portion formed in the shape of a manufacturing plan ingot 16 therein. Forming;
Method for producing a sintered ingot, characterized in that the compression molding (15) to the continuous sintering furnace (60) to perform the fusion between the raw material granules (10) particles through sintering and to cool.

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