KR20110097201A - Mold assembly and molding method using thereof - Google Patents

Abstract

The present invention provides a heating material applied to the surface of the hot water of the hot water portion, a gas pressure unit for pressurizing the hot water, an exhaust portion for discharging the combustion gas and the incoming gas of the heat material, a pressure gauge attached thereto, and gas pressure By the unit and the control unit for controlling the exhaust, the volume of the hot water can be greatly reduced compared to the existing mold assembly, and the production of the best quality molded products is possible. The present invention relates to a melt volume reduction mold assembly and a casting method using the same.

Description

MOLD ASSEMBLY AND MOLDING METHOD USING THEREOF}

The present invention provides a temperature maintenance function for the molten metal of the hot water part and a molten metal pressurization function by gas feeding, thereby simplifying the structure and reducing the volume of the hot water (mold) of the hot water part to reduce production costs and increase quality. An assembly and a casting method using the same.

Cast metals are used in a variety of applications, from ordinary steel to copper alloys and non-ferrous metals. In general, the hot water is installed to prevent replenishment and shrinkage defects of the melt due to shrinkage during solidification, and manages the temperature of the hot water. The solidification of the molten metal in the mold solidifies from the center of the mold away from the center of the mold and moves to the center of the molten metal. When the cast metal is solidified, it causes defects in the product due to shrinkage pores, pores, cracks due to solidification, and incorporation of impurities. Directional coagulation is required to coagulate from place.

In such a mold assembly, a technique for temperature management of the hot water part,

Korean Patent Publication No. 10-2006-0014533 (published on Feb. 16, 2006, hereinafter referred to as 'advanced technology') `` Integrated hot water heating device for propeller and metal casting '' is proposed,

The prior art consists of two lifting devices, four heat source devices, a distribution panel, and an integrated control panel in order to prevent various combinations occurring in the manufacture of products by continuously supplying heat in controlling the temperature of the inlet, and to improve casting quality. .

In the above prior art, the heat source device can be operated by selecting a self-drive method that can be driven in conjunction with a lift device by itself and an integrated control drive method that can be operated in an integrated control panel.

In the automatic mode, the head height of the elevating device is automatically controlled by detecting the voltage according to the output of the heat source device, and the function of detecting the signal of the thermocouple installed in the lower part of the hot water is automatically controlled, and the built-in function is automatically controlled.

The configuration is very complicated, which causes a high incidence of trouble, etc. In particular, there are many electrical control configurations as a whole, there is a problem that the entire operation of the device should be stopped when some error occurs.

In order to solve the above-mentioned problems, the molten metal of the molten metal of the pressure portion according to the present invention,

Core;

A mold body accommodating the core to form a cavity and a pressure part;

A heating material which is applied to the upper surface of the molten metal injected into the cavity and the molten portion of the mold body to ignite;

A cover unit covering and closing the mold body; And

A gas conveying unit configured to pressurize the molten metal to pressurize the molten gas into a space between the sealed cover unit and the pressure part;

Consisting of,

Pressurizing the molten metal of the pressure portion through the gas conveying unit, and by maintaining the molten metal temperature of the molten portion of the pressure portion through the heating material for a predetermined time, it is possible to reduce the volume of the melt filled in the molten portion It is characterized by.

In this case, the cover unit is characterized in that the exhaust portion for the discharge of the combustion gas and the compressed gas by the heat generating material, and the pressure gauge mounted thereto.

And it characterized in that it comprises a control unit for controlling the gas pressure unit and the exhaust unit.

And the heating material is characterized in that the aluminum, aluminum oxide, iron oxide, sodium oxide and ignition loss (Ig.loss) is mixed to form a powder.

On the other hand, in order to solve the above-mentioned problems, the casting method using the molten metal of the melt volume reduction mold assembly according to the present invention,

Installing a core in the mold body;

Injecting molten metal into a cavity and a pressure part formed by the mold body and the core installed therein;

Applying a heating material to the injected molten upper surface;

Covering and fixing the cover unit in the pressure portion of the mold body;

Pressurizing the molten metal of the pressure portion for a predetermined time through the gas pressure unit;

Removing the cover unit upon completion of pressurization, forcing or natural cooling the casting;

Separating the cooled casting and the core from the mold body; And

Removing the molten body and the core by the molten portion in the casting;

It is made, including.

At this time, when the molten metal is injected in the injection step, it is characterized in that the filling up to a position lower than the top height of the hot water.

The melt volume reduction mold assembly and the casting method using the same according to the present invention,

In the molding casting, the heating material applied to the hot water of the hot water portion forming the hot water body of the molded body and the hot water body is ignited, thereby maintaining a constant temperature for the hot water for a predetermined time and cooling the hot water by the pressurized gas. Prevent,

By pressurizing the hot water by the pressure of gas, the compactness can be increased to produce a molded article of the highest quality.

Since the volume height of the hot water can be greatly reduced, there is an effect that can contribute to the production cost reduction due to material savings.

1 is a plan view showing a mold assembly according to the present invention;
2 is a side configuration diagram of FIG. 1;
3 is a block diagram showing the molding by the mold assembly according to the present invention,
4 is a flow chart showing a casting method according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

As shown in Figures 1 to 4, the melt volume reduction mold assembly and the casting method using the same,

It is composed of a core (10), the mold main body 20, the heat generating material 30, the cover unit 40 and the gas pressure unit (50).

Looking at each configuration,

Core 10

It is made of a structure manufactured to suit the shape of various molded products.

The mold main body 20

The core 10 is accommodated to form a cavity 21 and a pressure part 22,

The upper part may be formed in an open rectangular frame structure.

In the present invention, it is composed of four powders 20A to facilitate insertion of the core 10 and the demoulding for separation of the molded casting 2 and the core 10.

At this time, the four powders 20A are arranged in a rectangular structure, and a driving means (not shown) for advancing and retreating the respective powders 20A is provided.

Therefore, the four powders 20A are arranged in a mutually open form by the corresponding driving means, and are narrowed to form a rectangular frame.

In the state where the core 10 is accommodated in the four powders 20A, the four powders 20A are narrowed to form the rectangular frame, thereby fixing the core 10 while forming the rectangular frame. ) And the pressure portion 22 to be formed.

And the mold body 20 may be provided with a holding unit 23 for fixing the covered cover unit 40,

In addition, a molten metal injection part 24 for temporarily storing the hot molten molten metal is separately provided, and the molten metal injection part 24 is rotated to one powder 20A of the four powders 20A constituting the mold main body 20. It can be implemented to be hinged if possible.

Heating material 30

It is applied to the upper surface of the molten metal (1) injected into the cavity 21 and the pressure portion 22 of the mold body 20 to ignite,

Aluminum, aluminum oxide, iron oxide, sodium oxide and ignition loss (Ig.loss) are mixed to form a powder.

As a result, the heat generating material 30 is ignited by the molten metal 1 that has been hot melted, and as the heat by ignition is transferred into the surface of the molten metal 1 and a predetermined depth of the molten metal part 22, the molten metal part 22 The molten metal (1) located at) maintains a constant temperature for a predetermined time,

By reducing the difference in cooling rate between the molten metal (1) located in the cavity 21 and the molten metal (1) located in the pressure portion 22 to prevent damage, such as cracks contribute to the molding of the highest quality.

Hereinafter, the molten metal 1 located on the molten metal part 22 (ie, filled) will be referred to collectively as 'melt' for use separately from the molten metal 1 located on the cavity 21, and reference numerals will be referred to here. It is indicated by '1a'.

The cover unit 40

As shown in Figs. 1 to 3,

To cover and close the mold body 20,

A plate 41 having a size enough to seal the hot water portion 22 by being placed on the upper end of the four powders 20A of the mold body 20,

A recess 42 recessed upwardly from the center of the plate 41,

An exhaust portion 43 connected to one end of the recess 42 for discharging the combustion gas and the compressed gas by the heat generating material 30, and

Pressure gauge 44 mounted on the exhaust portion 41

It is made, including.

The present invention will further include a control unit 60 for controlling the gas delivery unit 50 and the exhaust unit 41,

The control unit 60 is

The gas pressure amount of the gas pressure unit 50 and the exhaust portion 41 of the gas pump unit 50 are received by receiving the measured value of the gas amount pumped by the gas pressure unit 50 and the measured value of the pressure gauge 44. By adjusting the displacement, the pressure in the hot water part 22 can be kept constant.

The cover unit 40 is moved up and down from the mold main body 20 by a separate driving means (not shown), or moved or moved by a moving means (not shown) and placed or separated on the mold main body 20. Can be implemented to do that.

Gas pressure unit 50 is

As shown in Figs. 1 to 3,

In order to pressurize the molten metal (1) of the hot water unit 22 by forcing the gas to the space (S) between the cover unit 40 and the hot water unit 22 is sealed,

It is connected to the recess 42 of the cover unit 40 by a connecting line.

Therefore, the gas pushed by the gas pressure unit 50 is introduced into the recess 42 of the cover unit 40 along a connecting line, so that the recess 42 and the pressure part 22 of the cover unit 40 are introduced. ) Stays in the empty space S, but presses the upper portion of the plunger 1a of the plunger 22 by the pressure to be delivered, thereby increasing the density of the plunger 1a by pressurizing the gas. do.

In addition, the oxygen contained in the gas pumped by the gas pressure supply unit 50 acts as an element for ignition until the heat generating material 30 is completely burned.

Looking at the casting method using a mold assembly according to the present invention made of the above configuration,

As shown in FIG. 4,

Installing the core 10 in the mold body 20 (S10),

Injecting the molten metal 1 into the cavity 21 and the hot water part 22 formed by the mold body 20 and the core 10 installed therein (S20),

Applying the heating material 30 to the injected molten metal (1) upper surface (S30),

Covering and fixing the cover unit 40 to the pressure portion 22 of the mold body 20 (S40),

Pressing the molten metal 1 (ie, the molten metal 1a) of the molten portion 22 through the gas conveying unit 50 for a predetermined time (S50),

After the pressurization is completed, the cover unit 40 is removed, and forced or natural cooling of the casting 2 (S60),

Separating the cooled casting (2) and the core (10) from the mold body (20), and

Removing the hot water body and the core 10 by the hot water unit 22 in the casting (S80) (S80)

It is made, including.

Hereinafter, in the casting 2 formed by the cavity 21 and the hot water part 22, the shape solidified by the cavity is collectively referred to as a 'molding body', and the shape solidified by the hot water part is referred to as a 'hot water body'. Collectively.

When the volume of the hot water part 22 of the present invention is H, the existing mold assembly fills the molten metal by the height H, so that the cracks due to the difference in the cooling rate between the molded body and the hot water body of the casting 2 are reduced. Even if it occurs, the effect on the molded body is minimized to minimize the quality deterioration.

As a result, the existing mold assembly was intended to improve the compactness of the molded body by the gravity and gravity of the hot water filled in the hot water portion, and to overcome the problems caused by the difference in cooling rate through the amount of hot water, that is, the high pressure as described above.

On the other hand, the mold assembly of the present invention allows the temperature of the hot water (1a) to be maintained for a predetermined time through the heating material 30 to be ignited, as well as the hot water by the gas pressurized by the gas pressure unit (50) ( To prevent 1a) from cooling down,

In addition, by pressurizing the pressure bath (1a) by the pressurized gas through the gas pressure unit 50 to increase the compactness of the molded body and the molten body of the casting (2),

Compared to the existing mold assembly, a small amount of hot water 1a can be filled in the hot water part 22.

In other words, under conditions for producing a molded body of the same or similar quality, the mold assembly of the present invention has a height corresponding to half or a smaller range than the height H compared to the hot water height H filled in the hot water portion of the existing mold assembly. The hot water 1a can be filled up to about h (≒ H / 2), so that the hot water 1a can be filled to a position lower than the height of the top of the hot water part 22 when the hot water 1 is injected in the injection step S20. do.

Therefore, it is possible to reduce the amount of the hot water for the crushed body that is discarded or recycled by more than half can be expected to significantly reduce the production cost.

In addition, in the removing step (S80), by removing the core 10 from the molded body and the molten body forming the casting 2 and the core 10, only the final molded product remains.

In the above description of the present invention, with reference to the accompanying drawings, a specific shape and structure of the molten metal of the melt-decreasing mold assembly and the casting method using the same, but the present invention has been described various modifications and changes by those skilled in the art It is to be understood that such modifications and variations are intended to be included within the protection scope of the present invention.

1: melt 1a: pressure
2: casting S: space part
10: core
20: template body
20A: powder 21: cavity
22: pressure unit 23: holding unit
24: molten metal injection part
30: heating material
40: cover unit
41: plate 42: recess
43: exhaust 44: pressure gauge
50: gas conveying unit
60: control unit

Claims (6)

A core 10;
A mold body 20 in which the core 10 is accommodated to form a cavity 21 and a pressure part 22;
A heat generating material 30 applied to the upper surface of the molten metal 1 injected into the cavity 21 and the pressure portion 22 of the mold body 20 to ignite;
A cover unit 40 covering and closing the mold body 20; And
A gas pressure unit (50) for pressurizing the gas into the space (S) between the sealed cover unit (40) and the pressure unit (22) to press the molten metal (1) of the pressure unit (22);
Consisting of,

Pressurizing the molten metal 1 of the molten portion 22 through the gas conveying unit 50, and maintains the temperature of the molten metal 1 of the molten portion 22 through the heating material 30 for a predetermined time. And to reduce the volume of the molten metal (1) filled in the molten metal portion (22).
The method of claim 1,
The cover unit 40 includes an exhaust unit 43 for discharging the combustion gas and the pressurized gas by the heating material 30, and a pressure gauge 44 mounted thereto. Melt volume reduction mold assembly.
The method of claim 2,
And a control unit (60) for controlling the gas delivery unit (50) and the exhaust unit (43).
The method according to any one of claims 1 to 3,
The heating material 30 is a molten metal volume reduction mold assembly, characterized in that the aluminum, aluminum oxide, iron oxide, sodium oxide and ignition loss (Ig.loss) is mixed to form a powder.
Installing the core 10 in the mold body 20 of claim 1 (S10);
Injecting molten metal (1) into the cavity (21) and the hot water portion (22) formed by the mold body (20) and the core (10) installed therein (S20);
Applying a heating material (30) to the injected molten metal (1) upper surface (S30);
Covering and fixing the cover unit 40 of claim 1 to the pressure portion 22 of the mold body (20) (S40);
Pressing the molten metal (1) of the pressure portion 22 for a predetermined time through the gas pressure unit (50) of claim 1 (S50);
Removing the cover unit 40 when the pressurization is completed, forcibly or naturally cooling the casting 2 (S60);
Separating the cooled casting (2) and the core (10) from the mold body (20) (S70); And
Removing the molten body and the core (10) by the molten part (22) in the casting (S80);
Casting method using the melt volume reduction mold assembly made of a pressure portion.
The method of claim 5, wherein
Casting method using the melt volume reduction mold assembly of the molten portion, characterized in that the filling step (20) when the molten metal (1) is injected to a position lower than the top height of the molten portion (22).

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