KR20000042172A - Atomizing caster for producing multi-layer board - Google Patents

Abstract

PURPOSE: An atomizing caster is provided to produce a multi-layer board having an excellent adhesiveness and an upper atomized cast layer. CONSTITUTION: A gas atomizer(41) is connected to a disk camp(31) designed to form plural projections, and the rotation of the disk ca is changed to a reciprocal movement of a right and a left reciprocal movement arm(58). Herein, a movement transferring plate(59) vibration-moves so that a high pressure gas supply pipe(57) connected to the plate(59) is rotated and vibrated. The gas atomizer and the high pressure gas supply pipe are vibrated, and a molten steel spray(42) is vibrated or scanned. A lower alloy layer having regular thickness is formed while forming the projection with an atomized droplet sprayed on a lower plane board(43). When the plan board moves at a regular speed, plural gas atomizers are installed so that each spray forms a wide board by overlapping one another.

Description

Spray casting device for manufacturing multilayer composite board

The present invention relates to a spray casting apparatus for manufacturing a multilayer composite plate, and in particular, by generating a plurality of Gaussian peaks in one spray to form a plurality of protrusions in the spray-casting surface layer of the excellent adhesion between the alloy layer laminated The present invention relates to a spray casting device for producing a multilayer composite sheet having.

In general, a method of manufacturing a multilayer composite plate includes a method of charging a filler metal to a plate interface of a dissimilar metal and brazing the same, and a method of manufacturing an alloy to be joined using a welding rod to grow and weld the surface.

Here, the brazing joining method is basically subjected to a complicated process of charging and heating a filler metal suitable for each dissimilar material using a plate manufactured through a melting / casting / hot working process. In addition, the brazing method has a disadvantage in that it is difficult to manufacture a wide multi-layer composite material and low productivity. In addition, since a material such as high chromium-based cast iron having excellent abrasion resistance is difficult to process a plate, it is very difficult to manufacture a composite plate.

In addition, the multi-layer composite plate manufactured by the wet welding using the alloy welding rod can be coated with the same material as the hard-working high chromium-based cast iron, but not only cracking occurs in the coating layer but also the productivity of the composite layer is 4-15 kg per hour. There is a problem that this is low.

In addition, as a method for producing a molded article with high efficiency, the molten metal is atomized with a high-pressure gas, and then, dropping fine spray droplets on a lower substrate in a reaction state to form a bar, pipe, and plate. There is a spray casting method which can produce alloy shaped bodies of various shapes such as the like.

However, the conventional method has a purpose to produce an alloy plate mainly made of the same alloy. Therefore, in order to improve the peelability between the substrate and the production plate in spray plate production, it has been mainly performed using a ceramic substrate that is difficult to react with the metal alloy.

1 is a schematic view for explaining the components of the spray casting apparatus for producing a plate according to the prior art, which is described in US Patent No. 5,240,061 and US Patent No. 5,343,926.

As shown in FIG. 1, in the melting furnace 11, the molten metal is poured into the upper tundish 12, and the height of the bottom surface of the lower tundish 13 is controlled by controlling the stopper 14 mounted on the upper tundish 12. Keep it. When the molten metal flows downward through the molten orifice 15 of the lower tundish 13, a high-speed gas jet is sprayed from the gas atomizer 17 connected to the high-pressure gas supply pipe 16 to atomize the molten metal that falls. Let's do it. At this time, the substrate 19 mounted on the lower portion of the chamber 18 is horizontally moved with the rotation of the rollers 20 at both ends, and the stacked spray molten metal moves to the left while forming the plate 28 and continuously. Manufacture board.

In addition, in order to increase productivity, two gas atomizers 17 may be mounted as shown in FIG. In addition, a heating device 29 is provided at one side surface of the substrate 19 so as to prevent the generation of pores in the bottom surface of the plate material produced when the substrate 19 is cold. At this time, the thickness of the plate is determined by the ratio of the spraying-melting flow rate and the substrate moving speed.

In the following, an annular gas atomizer and a linear gas atomizer used in the spray casting apparatus for producing a sheet material will be described.

First, as shown in FIG. 2A, an annular gas atomizer is described in US Pat. No. 5,240,061 and US Pat. No. 5,343,926.

That is, as shown in Figure 2a, the spray 22 of the annular gas atomizer 21 has a kind of Gaussian distribution, so that there is much more mass in the center. In this case, the cross-sectional shape of the alloy plate 24 laminated on the substrate 23 has a thick center and becomes thinner as it goes to the edge.

Also, as shown in Fig. 2b, the linear gas atomizer is N.J. Grant, Casting of Near Net Shape Products, Ed. by Y. Sahai et al., Metallurgical Society, Warrendale, PA, pp.203-221 (1988).

That is, as shown in FIG. 2B, even in the case of the linear gas atomizer 25, since the mass distribution of the linear spray 26 shows an elongated rhombus, the cross-sectional shape of the laminated plate 27 becomes an elongated isosceles triangle shape. .

Conventional annular gas atomizers and linear gas atomizers as described above are not effective for the production of a plate having a constant thickness. In addition, there is a disadvantage that it is difficult to manufacture a wide plate. In other words, a certain level of width must be secured in the manufacture of plates to have commercial economic feasibility. However, the conventional annular gas atomizer 21 is limited to the width of the spray 22, it is impossible to manufacture a plate of more than 15cm wide. In addition, even when the linear gas atomizer 25 is applied, the molten metal flowing out of the linear orifice due to the surface tension of the molten metal is hardly maintained as it is, and is limited to the length of the linear gas atomizer 25. .

In particular, since interfacial bonding is important in securing multi-layer composite boards by securing the bonding property between dissimilar metals, it is necessary to form a small protrusion on the surface of the spray-casting plate at the bottom to increase adhesion to the spray-casting plate at the top. The solution should be presented.

Accordingly, the present invention has been made in order to solve the problems of the prior art as described above, by spraying droplets to have a plurality of Gaussian peaks to form a plurality of micro-projections to be laminated on the substrate to form a macroscopic uniform spray spraying It is an object of the present invention to provide a spray casting apparatus capable of manufacturing a multilayer composite plate having excellent adhesion with an upper spray casting layer by embossing the laminated surface while securing a layer.

In addition, another object of the present invention is to produce a wide multi-layer composite plate by applying a plurality of gas atomizers at the same time.

1 is a schematic view for explaining the components of the spray casting device for producing a plate according to the prior art,

Figure 2a is a schematic diagram showing the principle of the spray casting device for producing a plate using an annular gas atomizer,

Figure 2b is a schematic diagram showing the principle of the spray casting device for producing a plate using a linear gas atomizer,

3 is an explanatory view showing the principle of forming a plurality of Gaussian peaks in the spray of the gas atomizer according to the present invention;

4 is a schematic diagram illustrating a disk cam designed to form a plurality of Gaussian peaks in accordance with the present invention;

Figure 5 is a perspective view for explaining the components of the spray casting device for manufacturing a multilayer composite plate according to an embodiment of the present invention,

FIG. 6A is a cross-sectional view of the front surface of the spray casting apparatus for manufacturing a multilayer composite sheet shown in FIG. 5;

Figure 6b is a cross-sectional view cut away the side of the spray casting device for producing a multi-layer composite plate shown in FIG.

♠ Explanation of symbols on the main parts of the drawing ♠

31: disc cam 32: cam profile

41: annular gas atomizer 42: spray

43: substrate 51, 56: tundish

52: orifice 53: lower alloy layer

54 reaction layer 55 upper alloy layer

57: gas supply pipe 58: reciprocating arm

59: exercise plate 60: preheating device

The present invention for achieving the object as described above, is disposed in a direction perpendicular to the moving direction of the substrate and is disposed in the moving direction of the substrate at a predetermined interval so that the molten metal embedded in the tundish can be sprayed on the substrate And a plurality of droplet spraying means. The droplet ejection means includes a plurality of gas atomizers for spraying a metal melt embedded in a tundish onto a substrate using a gas supplied through a gas supply pipe, and a plurality of Gaussian peaks of droplets sprayed onto the substrate through the gas atomizer. And a converting member for connecting the disk cam with the gas cam and converting the rotational motion of the disk cam into reciprocating and vibrating motion. In addition, the present invention converts the rotational motion of the disk cam into the vibration of the gas atomizer to form a plurality of micro projections on the substrate droplets sprayed through the gas atomizer to form a uniform lower alloy layer at the same time Embossing is provided on the laminated surface to have excellent adhesion with the upper alloy layer formed by spraying from the top.

In addition, in the present invention, it is preferable that a plurality of preheating devices are disposed on the substrate to prevent pores of the lower alloy layer. In addition, the present invention can replace the substrate with a general alloy plate material and by controlling the surface roughness and preheating temperature it is also possible to manufacture a multi-layer composite plate using only the alloy plate material and the lower alloy layer.

In the following, with reference to the accompanying drawings a preferred embodiment of the spray casting device for producing a multilayer composite plate according to the present invention will be described in detail.

3 is an explanatory view showing the principle of forming a plurality of Gaussian peaks in the spray of the gas atomizer according to the present invention.

In order to obtain a plurality of Gaussian peaks, the scan rate must be periodically changed in one spray 22 as shown in the lower part of FIG. Although the scan mode change mode is composed of triangular waves in the schematic diagram, changing to a sine wave or cosine wave forms not only a smooth scan rate change but also a macroscopic uniform thickness, A spray-casting surface layer having a fine protrusion can be obtained. In addition, the upper spray casting layer may be changed to a scanning speed for forming the lower spray casting layer, thereby obtaining a composite sheet having a uniform thickness. In other words, if the scanning speed is changed to a sine wave form at the time of forming the lower layer, the final composite plate may have a uniform thickness by changing to a cosine wave form at the time of forming the upper layer.

In the drawings, FIG. 4 is a schematic diagram illustrating a disk cam designed to form a plurality of Gaussian peaks in accordance with the present invention.

As shown in FIG. 4, the disc cam 31 includes a cam profile 32. The cam profile 32 has a plurality of protrusions 33 used to change the scan speed, and the number of the minute protrusions formed in one spray is determined by the number of such protrusions 33. Therefore, increasing the number of protrusions 33 in the cam profile 32 can be solved to form many Gaussian peaks in one spray. In addition, since the increase or decrease of the scan speed varies depending on the curvature of the protrusion 33 in the cam profile 32, the height of the surface protrusion of the lower spray casting layer may be controlled by adjusting the curvature size of the protrusion 33.

In the drawings, Figure 5 is a perspective view for explaining the components of the spray casting apparatus for manufacturing a multilayer composite plate according to an embodiment of the present invention, Figure 6a is a cutaway front of the spray casting apparatus for manufacturing a multilayer composite plate shown in FIG. FIG. 6B is a cross-sectional view of the side surface of the spray casting apparatus for manufacturing a multilayer composite sheet shown in FIG. 5.

As shown in Figure 5 and Figure 6a, the spray casting device for manufacturing a multi-layer composite plate material of the present invention is equipped with a plurality of annular gas sprayer 41 side by side in a direction perpendicular to the moving direction of the substrate 43 to mount the gas sprayer 41 to the substrate Vibration or scanning is performed in a direction perpendicular to the moving direction of 43. Then, when the molten metal flows downward through the molten orifice 52 of the tundish 51, a high-speed gas jet emerges from the gas atomizer 41 connected to the high-pressure gas supply pipe 57 so as to atomize the molten metal that falls. Consists of. The gas atomizer 41 is connected to a disk cam 31 designed to form a plurality of micro-projections, and the rotational motion of the disk cam 31 is changed to the reciprocating motion of the left and right reciprocating motion arms 58. At this time, the exercise transmission plate 59 is subjected to a vibrational movement is a high-pressure gas supply pipe 57 connected to the plate 59 is a rotary vibration movement. Then, the high pressure gas supply pipe 57 and the fixed gas atomizer 41 vibrate and vibrate or scan the melt spray 42. Then, a lower alloy layer 53 having a macroscopically uniform thickness is formed while forming a small protrusion by spray droplets sprayed onto the lower plate substrate 43.

In addition, when the flat substrate 43 moves at a constant speed, a plurality of gas atomizers 41 are mounted so that the respective sprays 42 slightly overlap each other to form a wide plate.

Further, in order to manufacture the upper composite layer, as shown in Figs. 5 and 6B, the same structure used to form the lower alloy layer 53 is formed in the rear, the turn in which the upper molten alloy alloy is inherent The upper alloy layer 55 is formed on the lower alloy layer 53 by molten metal sprayed from the dish 56. At this time, the reaction layer 54 is formed between the lower alloy layer 53 and the upper alloy layer 55.

In addition, by repeatedly providing a plurality of such device configurations, it is possible to manufacture a multilayer composite sheet material in which two or more dissimilar metals are laminated.

In addition, the thickness of the plate laminated in the manufacture of the plate width of a predetermined width is determined by the ratio of the moving speed of the substrate to the total melt flow rate. In general, it is easy to control the horizontal moving speed of the substrate rather than the flow rate of the molten metal, it is not only easy to operate industrially but also accurate. And, the width of the plate can be changed according to the number of gas atomizers and the vibration displacement amount. That is, the width of the plate can be increased by increasing the number of installed gas atomizers, but there is a disadvantage in that the equipment investment cost is too large because the gas supply amount required for the process increases exponentially. Therefore, if the number of gas atomizers is fixed at 4 to 5, and the width of the plate is to be widened, it is possible to manufacture a wider plate by increasing the vibration displacement of each gas atomizer and inducing the spray to be elongated. . Of course, at this time, the distance between each gas atomizer should be increased according to the width of the plate.

In addition, when the substrate is too cold, there is a fear that pores are generated on the bottom of the plate produced. To prevent this, preheating the substrate prior to spray deposition results in a better bottom spray casting layer. At this time, the preheater 60 may use an oxygen-acetylene torch, a plasma torch, an induction heating device or the like. In the manufacture of a wide plate, a single preheating device is not sufficient, and a plurality of preheating devices can be mounted so as to evenly preheat the whole in the width direction of the substrate.

In addition, a low-cost alloy plate material is mounted on the substrate 43 instead of ceramic, and the preheating temperature is increased, and the surface roughness is adjusted to secure adhesion between the lower alloy layer sprayed and cast, thereby forming a double composite made of the substrate material and the lower sprayed casting layer. Plate manufacturing is also possible. For example, by spraying a high chromium-based alloy molten metal on a general mild steel plate can be produced a double plate material of a composite cast of mild steel and high chromium-based alloy. This technique can also be applied as a future alternative to the fusing welding technique that is currently widely used.

As described in detail above, the spray casting apparatus for manufacturing a multilayer composite sheet of the present invention macroscopically stacks a plurality of minute protrusions on a substrate by controlling the disk cam to have a plurality of Gaussian peaks in the amount of droplets sprayed from one spray. While securing a uniform lower spray casting layer and at the same time having the embossing (embossing) on the laminated surface can be produced a multi-layer composite plate having excellent adhesion with the upper spray casting layer.

In addition, the spray casting device for manufacturing a multi-layer composite plate of the present invention can apply a plurality of gas atomizers at the same time to produce a wide composite plate and a multi-layer composite plate.

In addition, the spray casting device for manufacturing a multi-layer composite plate of the present invention can adjust the vibration displacement of the gas atomizer more easily, the width of the plate can be more easily adjusted, by applying a plurality of gas atomizers there is an excellent work productivity is excellent.

Although the technical idea of the spray casting apparatus for manufacturing a multilayer composite sheet material of the present invention has been described together with the accompanying drawings, this is illustrative of the best embodiment of the present invention and is not intended to limit the present invention.

Claims (3)

In the spray casting apparatus for producing an alloy sheet material by spraying a molten metal with a gas of high pressure and then laminated on a substrate, It is disposed in the direction perpendicular to the direction of movement of the substrate and includes a plurality of droplet spray means arranged in the movement direction of the substrate at a predetermined interval to spray the metal melt embedded in the tundish, The droplet injection means includes a plurality of gas sprayers for spraying a metal melt embedded in a tundish on a substrate by using a gas supplied through a gas supply pipe, and a plurality of Gaussian peaks for droplets sprayed onto the substrate through the gas sprayer. And a converting member for connecting the disk cam to the disk cam and a plurality of gas atomizers to convert rotational motion of the disk cam into reciprocating and vibrating motion. The rotational motion of the disk cam is converted into the vibrational motion of the gas atomizer, and droplets sprayed through the gas atomizer form a plurality of micro-projections on the substrate and form a uniform lower alloy layer at the same time, while embossing the laminated surface. Spray casting apparatus for producing a multi-layer composite plate material characterized in that to have an embossing to have excellent adhesion to the upper alloy layer formed by spraying from the top. The spray casting apparatus of claim 1, wherein a plurality of preheating devices are disposed on the substrate to prevent pores of the lower alloy layer. The method of claim 1 or 2, wherein the substrate is replaced with a general alloy plate material, and the surface roughness and preheating temperature is controlled to manufacture a multilayer composite plate material using only the alloy plate material and the lower alloy layer. Spray casting equipment.