KR100644462B1 - Equipment and method for transportation of semi-solid slurry - Google Patents

Abstract

An equipment and a method for transferring a semi-solid slurry are provided to prevent an oxide film and pores from being generated in the slurry, thereby reducing defects of a product remarkably by injecting the slurry into a plunger in the state that the slurry of the transfer device is horizontally maintained at the same elevation as a slurry of a die-casting machine after placing a slurry on a rotatable semi-cylindrical transfer device. In a semi-solid slurry transfer equipment for transferring a semi-molten slurry to a sleeve(12) of a die-casting machine, an equipment for transferring a semi-solid slurry comprises: a transfer body(11) rotated and transferred to the sleeve by a drive motor(17); an opening-and-closing cover(16) connected to a front portion of the transfer body by a hinge; a plunger(13) for transferring a slurry placed on the transfer body to the sleeve; an optical sensor(18) for plunger recognition mounted on the transfer body; and a control part for controlling operation of the plunger, the opening-and-closing cover and the transfer body by receiving a signal of the optical sensor. The transfer body is formed in a semi-cylindrical shape.

Description

Equipment and method for transportation of semi-solid slurry}

Figure 1a is a schematic diagram showing a conventional slurry conveying apparatus.

FIG. 1B is a cross sectional view taken along the line “A-A” in FIG. 1A;

2 is a schematic view showing a slurry transport apparatus according to the present invention.

3 is a perspective view showing a slurry transport apparatus according to the present invention.

Figure 4 is a block diagram showing a control state of the slurry conveying apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: slurry cup 11: transfer body

12 sleeve 13 plunger

16: opening and closing cover 17: drive motor

18: Optical sensor for plunger recognition 19: Guide bar

The present invention relates to a reactor and slurry transport apparatus and method, and more particularly, to inject a liquid molten metal into the slurry cup, and then to a slurry in the reaction solid state through a method such as mechanical stirring or electromagnetic stirring; Reactor high slurry feeder to prevent the formation of oxide film and pores in the slurry that can occur in the slurry transfer part to the sleeve of the die casting machine after the slurry is manufactured, thereby significantly reducing product defects. And to a method.

Along with the development of low pollution emission process technology and energy-saving lightweight material development strategy to solve the environmental and energy problems, the reaction high-alloy manufacturing technology, a new structural metal material technology, is gaining worldwide attention as a new metal material processing field.

In particular, as a lightweight material, aluminum alloy is widely used for manufacturing lightweight parts for automobiles, and is mainly manufactured by die casting or molten metal forging.

However, the parts produced by these methods have a disadvantage in that toughness and durability are insufficient because dendritic structures are formed upon solidification.

In order to solve this disadvantage, it is necessary to break up the spherical densities by agitation during solidification in the liquid and solid phases, to form spheroids, and to manufacture an alloy having a uniform microstructure, and to reheat the billet in a semi-melt state. There is a need for a process technology that uses only properties to shape products.

The reaction solid (or semi-melt) process is a complex process that combines casting and forging, which was discovered at MIT in 1971 and is called leocasting, thixocasting, or stircasting.

Today's reactive solidification can be classified into two types: rheocasting and thixoforming.

Rheocasting is a slurry produced in a solid state, which is directly processed into a final product.Thixoforming is a billet cast in a solid state. Ground tissue), and the billet is reheated to a stable state in a slug cut to a suitable length to be forged or die casted into a final product.

Generally, the reaction solid (or semi-melt) metal is a slurry in which the grain boundary inside the metal is partially dissolved when the metal material is kept at the temperature of the reaction solid region, and the solid component of the undissolved crystal grain remains. It is defined as.

The reaction solid raw materials required for the formation of the reaction solid are manufactured by stirring, either mechanically or electromagnetically, in a state in which the solid and liquid components of the metal are mixed, and this manufacturing process is called rheocasting.

When the metal is stirred in the reaction solid state, the metal structure is composed of near spherical primary particles and a liquid surrounding the primary crystal instead of the coarse dendritic structure that is found in a general casting, thereby minimizing macroscopic segregation of solute atoms.

These solidified alloys have excellent fluidity in the solidified state and generally have a viscosity of about 0.01 to 100 Poise.

In addition, the reactive metal has a thixotrophic property of decreasing the viscosity as the pseudoplastic and the stirring force increases as the shear strain rate increases.

Therefore, the alloy of the reaction solid metal is well filled in the die in the slurry state, and is performed at a lower temperature than the liquid phase, so that the die life is long and the total solidification time is reduced. ), The porosity is reduced.

In addition, the reaction solid alloy needs a lower load in the secondary processing, such as rolling, extrusion, forging, there is an advantage that can easily form a complex shape parts.

It increases the fluidity during injection and lowers the deformation resistance, thereby making it possible to manufacture a thread-shaped product by pressure injection molding.

In addition, even in a solid-liquid coexistence state (solid phase ratio of 0.6 or more), billets can be transported as if they are solid, which is easy to handle, and the melting process is omitted, which is preferable in terms of environmental conservation.

On the other hand, thixotropic materials, like butter, honey, and some paints, flow as a liquid when shear stress is applied, and thicken up when opposing forces are applied.

Their viscosity is dependent on shear rate and time. When the fully liquid material is continuously stirred while the temperature is lowered to the semi-solid state, which is a solid-liquid coexistence area, the viscosity of the material is remarkably inferior in viscosity as compared with the material in which the stirring process is omitted.

In addition, it is possible to make the particles fine by breaking the dendritic branches produced during solidification through a strong stirring process, wherein the microstructure in the solid-liquid coexistence region is composed of a liquid phase and spherical solid phases surrounded by the liquid phase.

The formation of these microstructures is an essential process for the semisolid process and thixotropic behavior. When the semisolid can support itself, the spherical particles aggregate and thus the viscosity increases with time.

If the material is subjected to shear stress, the aggregated particles break and lose their viscosity. If the material is able to support its own weight in a semi-solid state with a solid content of 30% to 50%, it is considerably easier to handle the material as it does for solids.

When it is subjected to shear stress, the material can flow with a drop in viscosity similar to that of machine oil. This is the nature of the slurry to be used in the semisolid process.

Semi-solid processes are being developed competitively for military aviation and, most notably, for automotive parts production.

In the automotive sector, suspension parts, engine brackets and fuel rails are produced, and in other fields, high-strength parts such as mountain bikes or snowmobiles are being developed.

In the electronic material parts, magnesium alloy dixoforming processes are used for laptop cases and electronic product cases.

1A and 1B illustrate a conventional slurry conveying apparatus, in which a sheet conveying apparatus 100 conveys the slurry 120 to the sleeve 112 of the injection apparatus 110 and the slurry conveying apparatus 100 of the conveying apparatus 100. The slurry is introduced into the sleeve 112 while the center portion is opened.

However, in this process, the slurry is damaged by the impact, the oxide film or pores are mixed, there is a problem that a defect occurs.

The present invention has been made in view of the above-mentioned point, and after injecting a liquid molten metal into a slurry cup, a die casting machine after slurry production in a device for producing a slurry in a reaction state through a method such as mechanical stirring or electromagnetic stirring The slurry is transported until the slurry is seated in a rotatable semi-cylindrical conveying device, and the slurry is injected into the plunger while being level with the sleeve of the die casting machine to prevent the occurrence of oxide film and pores in the existing slurry. It is an object of the present invention to provide an apparatus and a method for conveying slurry slurry that can significantly reduce product defects.

In the present invention for achieving the above object is a semi-slurry slurry transfer device in which the semi-melt slurry is transferred to the sleeve of the die casting machine,

A transfer body rotated by a drive motor to transfer to the sleeve; An opening and closing cover hinged to the front end of the transfer body; A plunger for transferring the slurry seated on the conveying body to the sleeve; An optical sensor for plunger recognition mounted to the conveying body; A control unit which receives the signal of the optical sensor and controls the operation of the plunger, the opening / closing cover and the conveying body; Characterized in that configured to include.

In a preferred embodiment, the transfer body is characterized in that the semi-cylindrical.

In a more preferred embodiment, the step of placing the semi-melt slurry prepared in the slurry cup to the transfer body; Rotating the transfer body by the drive motor to coincide with the sleeve of the die casting machine; Receiving the operation signal of the control unit and inserting the plunger into the conveying main body; The control unit receives the detection signal of the optical sensor for recognizing the plunger mounted on the transfer body in the step of sending the open signal to the opening and closing cover of the transfer body; Opening and closing the cover in this step and transferring the slurry to the sleeve by a plunger; Characterized in that comprises a.

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

2 is a schematic view showing a slurry conveying apparatus according to the present invention, Figure 3 is a perspective view showing a slurry conveying apparatus according to the present invention, Figure 4 is a block diagram showing a control state of the slurry conveying apparatus according to the present invention. .

The present invention relates to a reactor slurry transfer device for transferring slurry (14) to the die casting machine after the slurry (14) production.

The present invention improves problems such as formation of an oxide film in the slurry 14 and damage to the slurry shape due to impact during injection into the sleeve, which may occur in the portion of the slurry 14 transferred to the die casting machine after the slurry 14 is manufactured. There is a focus on this.

The present invention provides a slurry cup 10, a transfer main body 11 on which the slurry 14 prepared in the slurry cup 10 is seated, and a plunger for transferring the slurry 14 to the sleeve 12 of the die casting machine ( 13) and a control unit for controlling the operation of the conveying body 11 and the plunger 13.

After receiving the molten metal produced in the furnace and transferred to the ladle in the slurry cup 10, the slurry 14 produced in the slurry cup 10 is transferred to the sleeve 12 of the die casting machine by the transfer device according to the present invention. ) Is transferred into.

At this time, the outer peripheral surface of the slurry cup 10 is tapered so that the slurry 14 is easily taken out to the bottom.

The slurry 14 is cylindrical and manufactured by stirring mechanically or electromagnetically in a state where a solid phase and a liquid component of a metal are mixed.

The transfer body 11 is semi-cylindrical, and the opening and closing cover 16 is hingedly coupled to the front end of the transfer body 11 adjacent to the sleeve 12 of the die casting machine. At this time, the opening and closing cover 16 is provided with a solenoid valve to receive the electrical signal of the control unit to rotate back and forth.

In addition, a hollow portion is formed in the inside of the transfer body 11 to allow the slurry 14 to be seated thereon, so that an impact is not applied when the slurry 14 is taken out from the slurry cup 10 to the transfer body 11. The angle 14 is inclined so that the slurry 14 rests at an angle to the hollow portion of the transfer body 11 and does not fall downward to the transfer body 11 by the opening / closing cover 16.

A drive motor 17 is installed on the bottom of the transfer body 11, and the drive motor 17 is capable of speed adjustment and forward and reverse rotation so that the transfer body 11 rotates at a predetermined angle about the drive motor shaft. do.

In addition, an optical sensor 18 for plunger recognition is installed at the rear end of the conveying main body 11 so that when the plunger 13 is inserted into the conveying main body 11, it detects this and sends a signal to the control unit.

The control unit receives the signal of the optical sensor for plunger recognition to control the operation of the plunger 13, the transfer body 11 and the opening and closing cover 16.

The plunger 13 is installed at the rear of the conveying body 11 and fixed by the guide bar 19 to move from side to side, and the plunger 13 is also moved by receiving an electrical signal from the controller.

Referring to the reaction slurry slurry transfer method according to the present invention by such a configuration as follows.

① The slurry produced in the slurry cup 10 is taken out at an angle to the hollow portion of the conveying body 11 inclined 45 degrees.

② The transfer body 11 on which the slurry 14 is seated is horizontally rotated by the drive motor 17 so as to lie in a straight line behind the sleeve 12 of the die casting machine.

③ In the above step, the plunger 13 is inserted into the transfer body 11 by receiving a signal from the controller.

④ In the above step, the plunger recognition optical sensor 18 detects the plunger 13 inserted into the transfer body 11 and outputs a signal to the controller, and the opening / closing cover 16 of the transfer body 11 is It receives the signal from the controller and rotates forward to open.

⑤ In this step, the slurry 14 is introduced into the sleeve 12 of the die casting machine by the plunger 13.

According to this conveying method, the viscosity of the slurry 14 according to the shear force and time, and the formation of the oxide film from the manufacture of the slurry 14 to the injection into the sleeve 12 of the die casting machine and the impact of the slurry during injection into the sleeve 14 ) Problems such as shape breakage can be improved.

That is, the semi-molten slurry 14 produced in the slurry cup 10 is seated on the 45 ° slanted conveying body 11 to alleviate the impact, and keep the plunger horizontal to the same height as the sleeve 12 of the die casting machine. In the process of being transferred to the inside of the sleeve 12 by the (13) it is possible to maintain the viscosity due to the minimum time, and to maintain the shape during the slurry injection into the sleeve 12, thereby oxidizing according to the destruction of the shape of the slurry (14) There is an advantage that can prevent film mixing and pore mixing.

As described above, according to the reaction apparatus slurry transfer apparatus and method according to the present invention, the semi-molten slurry produced in the slurry cup is seated on the 45 ° tilted transfer body to mitigate the impact, the same height as the sleeve of the die casting machine It is possible to maintain the viscosity due to the minimum time in the process of conveying the inside of the sleeve by the plunger by maintaining the furnace horizontally, and maintaining the shape during slurry injection into the sleeve, thereby preventing the oxide film mixing and pore mixing due to the slurry shape destruction. There is an advantage to stop.

Claims (3)

In the reaction vessel slurry transfer device in which the semi-melt slurry is transferred to the sleeve 12 of the die casting machine, A transfer main body 11 rotated by a drive motor 17 to transfer to the sleeve; An opening and closing cover (16) hingedly coupled to the front end of the transfer body; A plunger (13) for transferring the slurry seated on the conveying body to the sleeve; An optical sensor 18 for plunger recognition mounted to the conveying body; A control unit which receives the signal of the optical sensor and controls the operation of the plunger, the opening / closing cover and the conveying body; Reactor slurry transport apparatus characterized in that comprises a. The apparatus of claim 1, wherein the transfer body has a semi-cylindrical shape. In the reaction slurry transfer method, Placing the semi-molten slurry prepared in the slurry cup on the conveying body; Rotating the transfer body by the drive motor to coincide with the sleeve of the die casting machine; Receiving the operation signal of the control unit and inserting the plunger into the conveying main body; The control unit receives the detection signal of the optical sensor for recognizing the plunger mounted on the transfer body in the step of sending the open signal to the opening and closing cover of the transfer body; Opening and closing the cover in this step and transferring the slurry to the sleeve by a plunger; Reactor solid slurry transfer method comprising a.

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