KR101145186B1 - A method for plastic forming of high reactivity metal powders use of plastic forming apparatus having a rapid heating system using resistance heating - Google Patents

Abstract

The plastic working method of the highly reactive metal powder using the plasticizer having a rapid heating means using the resistance according to the present invention includes an equipment setting step (S100), titanium (Ti), zirconium (Zr), and niobium (Nb). , A powder rolling step (S200) of rolling a highly reactive metal powder made of one or more of molybdenum (Mo) into a low density plate and a low density by operating a rapid heating means for generating resistance to the low density plate guided inside the inert atmosphere. Resistance heating step (S300) for heating the plate, hot rolling step (S400) for manufacturing a rolled product by rolling the heated low density plate material, and rapidly cooling the rolled product guided to the outside by the inert atmosphere below 400 ℃ It is characterized by consisting of a rapid cooling step (S500) to limit the surface oxidation.

Description

A process for plastic forming of high reactivity metal powders use of plastic forming apparatus having a rapid heating system using resistance heating}

According to the present invention, a plasticizer having a rapid heating means using a resistance which enables hot rolling by forming a low density plate by rolling a metal powder and providing resistance and pressure of the rapid heating means to the low density plate to be heated and rolled. The present invention relates to a plastic working method of a highly reactive metal powder used.

In general, in the case of a metal material is heated to a high temperature, the flow stress for plastic processing is lowered to facilitate the molding. However, it is difficult to apply the hot forming method easily in the case of a metal material having high high temperature strength and high reactivity with air at high temperature.

In this case, various methods for reducing the reaction of the material itself with the atmosphere are introduced and used. The traditional method is as follows.

The first method is a metal material with relatively little surface oxidation, and the outside is wrapped with a thin dissimilar metal plate, etc., the inside is vacuumed and sealed, followed by hot rolling, and the finishing process is a mechanical or chemical method. Removing using

That is, US Pat. No. 4,917,858 introduces a method for removing external can materials after putting the powder material quantified in order to manufacture TiAl using Ti and Al powder in a can and rolling in a hot or cold state.

However, according to this method, an outer coating material is absolutely necessary, and after processing, it is difficult to remove the outer coating material again, and due to the outer coating material, it is also difficult to control the dimensions.

The second method is a method of coating and hot forming an antioxidant such as glass fiber on the surface of the alloy on the surface of the molding material before hot forming.

However, in this method, the surface oxidation prevention effect is not perfect, the coated antioxidant layer is removed or damaged during molding, and there is a problem that the surface oxidation may occur due to the surface is exposed to the atmosphere at high temperature during continuous molding.

In addition, after forming a uniform coating layer on the surface through a separate coating process and after rolling is required to remove the coating layer, there is a problem that the antioxidant effect is inferior compared to the metal packing method described above.

Finally, it is a method of shaping a board | plate material using the plastic working atmosphere itself as a vacuum or an inert atmosphere.

This method is published in International Patent Publication No. WO08 / 122075. In detail, the powder powder strip, which is rolled in the air, is induction heated in an argon atmosphere and hot rolled at a high temperature to produce a high density plate.

However, the induction heating used in this method is relatively low in thermal efficiency, and it is difficult to obtain theoretical density by itself. That is, since there is no method to remove the bubbles existing in the strip itself at the source, the cavity formed by the waste holes between the powder particles formed at the beginning remains intact after the post-process, and even though it is compressed by the post-process, the closed pore form Due to the presence of the cavity, the properties of the final plate will be degraded.

On the other hand, when rolling a plate, a bar, a mold using a metal powder material, if the metal powder is a metal Ti, Zr, Nb, Mo, etc. having high reactivity with the atmosphere at a high temperature, the surface oxidation even if molded by the various methods described above There is a difficulty in preventing, and there is a problem that continuous molding is impossible as a number of processes are required.

An object of the present invention is to solve the problems of the prior art as described above, to form a low density plate material by rolling Ti, Zr, Nb, Mo metal powder having high reactivity with oxygen, the resistance of the rapid heating means to the low density plate material And a plasticizing method of a highly reactive metal powder using a firing furnace having a rapid heating means using a resistance that provides a pressure to enable hot rolling by rapid heating and rolling.

It is another object of the present invention to provide a plastic working method for a highly reactive metal powder using a firing furnace having a rapid heating means using a resistance to improve the quality of a rolled product by rapidly cooling a hot rolled rolled product to suppress oxidation reaction. Is to provide.

The plastic working method of the highly reactive metal powder using the plasticizer having a rapid heating means using the resistance according to the present invention includes an equipment setting step, titanium (Ti), zirconium (Zr), niobium (Nb), and molybdenum ( Resistance heating for heating a low density plate by operating a powder rolling step of rolling a highly reactive metal powder composed of one or more of Mo) to a low density plate, and a rapid heating means for generating resistance to the low density plate guided inside the inert atmosphere. And a hot rolling step of manufacturing the rolled product by rolling the heated low density plate material, and a rapid cooling step of limiting the surface oxidation by rapidly cooling the rolled product guided to the outside with the inert atmosphere below 400 ° C. It is done.

The resistance heating step is characterized in that the process of applying a different pole of the (-) pole and (+) pole to the first heating roller portion and the second heating roller constituting the rapid heating means.

In the equipment setting step, the second heating roller portion is provided with a plurality, characterized in that the plurality of second heating roller portion is arranged to have a different separation distance in the same direction with respect to the first heating roller portion.

The equipment setting step is characterized in that the process of setting the size of the resistance generated in the low-density sheet during the resistance heating step by adjusting the separation distance and the rotational speed of the second heating roller portion and the first heating roller portion.

The powder rolling step has a density of 60 to 95% and is characterized in that the process of molding a low density plate formed with a number of open pores.

The hot rolling step is characterized in that the low-density sheet material to be rolled into any one of the wire rod, plate, the shape using a forming groove formed on the outer peripheral surface of the hot rolling roller.

In the resistance heating step, the second heating roller portion and the first heating roller portion is characterized in that for selectively rolling the low density plate material.

After the rapid cooling step, characterized in that the cutting step for cutting the rolled product is further provided.

In the present invention as described above, a bulk powder material such as Ti, Zr, Nb, Mo, which has a high affinity with oxygen and is difficult to be hot rolled, is configured to be continuously heated and rolled using a resistance.

Therefore, since the process is simplified and the productivity is improved, the manufacturing cost is reduced.

In addition, it is possible to change the application distance to the various types of metal powder by adjusting the separation distance and the amount of energization of the first heating roller portion and the second heating roller portion has the advantage that the ease of use is improved.

In addition, by reducing the reaction with the atmosphere in an inert atmosphere and rapidly heating by taking a resistive heating method of the material it is possible to suppress the generation of the surface oxide layer to the maximum, there is an effect that can greatly improve the density and mechanical strength of the rolled article.

1 is a schematic view showing the configuration of a plastic processing apparatus having a rapid heating means using the resistance according to the present invention.
Figure 2 is a manufacturing process diagram showing the plastic working method of a highly reactive metal powder using a plastic working factory equipped with a rapid heating means using the resistance according to the present invention.

Plastic processing apparatus equipped with rapid heating means using the resistance according to the present invention (hereinafter referred to as `` calcination processing apparatus '') is a metal powder, such as Ti, Zr, Nb, Mo, which is difficult to heat the atmosphere due to reaction with the atmosphere during processing It is an apparatus for molding more easily.

That is, the calcined plasticizer is a device for rapidly heating by using a resistance after rolling the metal powder, the rapid surface oxidation occurs during heating using a low-density sheet, and imposes plastic deformation in a post-process.

Hereinafter, the configuration of the plastic processing apparatus 100 will be described with reference to FIG. 1.

The plastic processing apparatus 100 includes a powder rolling roller 110 for rolling a metal powder into a low density plate material P, a guide roller 120 for guiding a direction in which the low density plate material P is transported, and the guide roller. Rapid heating means 130 for generating resistance to the low-density sheet material P guided by 120 and heating it, a hot rolling roller 140 for rolling the heated low-density plate material P, and the hot rolling roller 140. It comprises a cooling means 150 for cooling the rolled article rolled in the) and the storage means 160 for storing the cooled rolled article.

The powder rolling roller 110 is composed of a pair is rotated in the opposite direction to each other to roll the metal powder to a low density plate material (P).

Therefore, the hopper 112 for storing and supplying the metal powder is provided on the upper side of the powder rolling roller 110.

The guide roller 120 is provided below the powder rolling roller 110. The guide roller 120 is a configuration for guiding the low density plate material P rolled by the powder rolling roller 110 in the right direction.

The rapid heating means 130 is provided on the right side of the guide roller 120. The rapid heating means 130 is a plurality of rollers that are spaced apart from each other adjacent to each other in the up / down direction to be spaced apart, so that resistance can be generated in the low-density sheet material (P) transferred from the guide roller 120.

That is, the rapid heating means 130 is spaced apart from the first heating roller portion 132 and the first heating roller portion 132 connected to any one of the (-) pole or (+) pole and the first It comprises a second heating roller portion 134 is connected to the heating roller unit 132 and the other pole. In addition, the rapid heating means 130 is connected to a power supply means 170 for supplying power.

More specifically, the first heating roller 132 is configured in one embodiment in the embodiment of the present invention and the (-) pole is connected. In addition, in the embodiment of the present invention, the second heating roller part 134 is composed of two, and both of the positive electrodes are connected.

Therefore, when the power supply means 170 operates to apply different poles to the first heating roller part 132 and the second heating roller part 134, the first heating roller part 132 and the second heating roller part 132 are applied. Between the heating roller parts 134, a current flows through the low density plate material P so that heat of resistance can be generated.

And, the second heating roller portion 134 is composed of two in the embodiment of the present invention. Accordingly, high resistance due to powder contact is generated in the low density plate P between the two second heating roller parts 134, thereby enabling rapid heating, and second heating adjacent to the first heating roller part 132. Where the right side of the roller portion 134 is located, a relatively low resistance is generated.

In addition, the first heating roller portion 132 and the second heating roller portion 134 is configured such that the separation distance is selectively adjustable. This is because the distance between the first heating roller 132 and the second heating roller 134 and the magnitude of the resistance is proportional and the heating time is determined according to the feed rate of the plate, such a separation distance and a low density plate (P). The heating speed and the holding time are controlled by adjusting the feed speed of).

In addition, the first heating roller part 132 and the second heating roller part 134 are configured to selectively roll the low density plate material (P).

That is, the low density plate material P passing through the second heating roller part 134 on the left side of the two second heating roller parts 134 is in a heated state, so the second heating roller part 134 and the first heating part on the right side are heated. The roller portion 132 may be configured to selectively roll the low density board member P to be rolled a plurality of times.

At this time, the first heating roller 132 and the second heating roller 134, Cu-Cr-based, Cu-Be-based alloy materials having high electrical conductivity and high temperature strength and wear resistance may be used.

The hot rolling roller 140 is not provided with a separate heating element, and is configured to roll the low density plate material P as heat generated according to the resistance caused by the action of the rapid heating means 130.

Therefore, the hot rolling roller 140 is preferably configured to be hot rolling before the heated low density plate material P is disposed adjacent to the first heating roller part 132 and cooled.

Then, the hot rolling roller 140 is to roll the low-density sheet material (P) at a reduction ratio of 20-50%, where the density of the final rolled article reaches a theoretical density of 99% or more

The hot rolling roller 140 is configured to be capable of molding the low density plate material (P) into a continuous rolled article of various shapes.

That is, although not shown on the outer circumferential surface of the hot rolling roller 140, a molding groove for rolling the low density plate material (P) into a wire rod, a plate member, a shape may be provided.

The guide roller 120, the rapid heating means 130 and the hot rolling roller 140 is located in the inert atmosphere (180). The inert atmosphere 180 serves to suppress surface oxidation of the low density plate P by accommodating an inert gas such as argon (Ar) therein to maintain the inert atmosphere.

Cooling means 150 is provided on the outside of the inert atmosphere (180). The cooling means 150 is configured to rapidly cool the hot rolled rolled product.

That is, since the rolled article may be oxidized by reaction with the atmosphere when the temperature is high, immediately after exiting the inert atmosphere 180, the rolled article is rapidly cooled by using the cooling means 150.

At this time, it is apparent that the cooling means 150 can cool the rolled product by air cooling or water cooling.

The storage means 160 is provided on the right side of the cooling means 150. The storage means 160 is a configuration for winding and storing the rolled product, the hot rolling is completed to the outer peripheral surface.

The left side of the storage means 160 may be further provided with a cutter (not shown). The cutter is configured to cut the rolled article by a certain length, it is apparent that the cutter is provided and the storage means 160 may be replaced by a rack (not a roller type) during operation.

Hereinafter, the plastic working method of the highly reactive metal powder using the plastic working apparatus 100 configured as described above will be described with reference to FIG. 2.

2 is a manufacturing process diagram showing a plastic working method of a highly reactive metal powder using a plastic working factory having a rapid heating means using the resistance according to the present invention.

As shown in the figure, a method of plasticizing a highly reactive metal powder, the equipment setting step (S100), the powder rolling step (S200) for rolling the metal powder into a low density plate material (P) and the low density plate material (P) resistance The resistance heating step (S300) for heating the low density plate material (P) by operating the rapid heating means for generating a hot rolling, the hot rolling step (S400) for rolling the heated low density plate material (P), and cooling the rolled product It consists of a rapid cooling step (S500).

The equipment setting step adjusts the separation distance and rotational speed of the second heating roller part 134 and the first heating roller part 132, the first heating roller part 132 and the second heating roller part 134 ) Is a process of connecting the other polarity of the power supply means (170).

In addition, the hopper 112 is filled with metal powder for molding into a low density plate material (P).

When the equipment setting step is completed, by dropping the metal powder in the hopper downward to form a low-density sheet material (P) using the powder rolling roller 110 (powder rolling step: S200).

At this time, the low density plate (P) is in a state having a low density of 60 to 95%.

Thereafter, the low density plate material P is introduced into the inert atmosphere 180 and guided in the right direction by the guide roller 120.

Thereafter, the low density plate material P is subjected to the resistance heating step S300 which is rapidly heated by the resistance while passing through the second heating roller part 134.

In addition, the low density plate material (P) is selectively heated as well as the rolling process by the first heating roller portion 132 and the second heating roller portion 134.

Since the low density plate (P) heated by the rapid heating means 130 is rolled by a rolling ratio of 20 to 50% by the hot rolling roller 140 can increase the density of the material and the homogeneity of the tissue, 99 A rolled article having a theoretical density of% or more can be produced (hot rolling step: S400).

The rolled product is drawn out to the inert atmosphere 180 and at the same time it is cooled to 400 ° C. or less by the cooling means 150 (quick cooling step: S500).

After the rapid cooling step (S500), the rolled product is cut by a predetermined length using a cutter, or is wound and stored in a roller-type storage means 160 as shown in FIG.

According to the above process, the continuous plastic working of the highly reactive metal powder is completed, and in order to produce a rolled product having a density of 100%, a vacuum sintering or cold rolling process may be added if necessary.

At this time, the low density plate (P) is to have a low density of 60 to 95%, it will be advantageous to remove the remaining pores during vacuum sintering by maintaining the open pores (open pore) form of the internal pores to the outside.

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

100. Plastic Processing Equipment 110. Powder Rolling Roller
112. Hopper 120. Guide roller
130. Rapid heating means 132. First heating roller section
134. Second heating roller section 140. Hot rolling roller
150. Cooling means 160. Storage means
170. Power supply unit 180. Inert atmosphere
P. Low Density Sheet S100. Equipment setting stage
S200. Powder rolling step S300. Resistance heating stage
S400. Hot rolling step S500. Rapid Cooling Step

Claims (8)

An equipment setting step of setting a size of a resistance to be generated in the low density plate by adjusting a distance between the second heating roller part and the first heating roller part, which is one component of the rapid heating means for heating the low density plate using a resistance;
A powder rolling step of rolling the bulk titanium (Ti) powder with a powder rolling roller to form a low density plate member having a density of 60 to 95% and having many open pores;
The low density plate is guided to the inert atmosphere to the inside, and the first heating roller part and the second heating roller part are applied with different ones of (-) and (+) poles to generate resistance to the low density plate and heated. Resistance heating stage,
A hot rolling step of manufacturing a rolled product by rolling the heated low density sheet at a reduction ratio of 20-50%,
Highly reactive metal powder using a plasticizer with rapid heating means using a resistance, characterized in that the rapid cooling step to limit the surface oxidation by rapid cooling the rolled article guided to the outside in the inert atmosphere below 400 ℃ Plastic processing method. The method of claim 1, wherein the first heating roller portion and the second heating roller portion,
A plastic working method of a highly reactive metal powder using a plasticizer having a rapid heating means using resistance characterized in that it is formed of at least one of a Cu-Cr alloy and a Cu-Be alloy. According to claim 2, In the equipment setting step,
The second heating rollers are provided in plural, and the plurality of second heating rollers are disposed to have different separation distances in the same direction with respect to the first heating rollers. Plastic processing method of highly reactive metal powder using a device. delete delete The method of claim 3, wherein the hot rolling step is a process of rolling a low density plate into any one of wire, plate, and form using a forming groove formed on the outer circumferential surface of the hot rolling roller. Plastic working method of highly reactive metal powder using plasticizer. The method of claim 6, wherein in the resistance heating step,
And the second heating roller portion and the first heating roller portion selectively roll the low-density sheet material. The plastic working method of the highly reactive metal powder using the firing furnace having a rapid heating means using resistance. 8. The method of claim 7, wherein after the rapid cooling step, a cutting step of cutting the rolled product is further provided. .

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