KR101743255B1 - Low speed low-pressure die-casting molds and casting process - Google Patents

Low speed low-pressure die-casting molds and casting process Download PDF

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Publication number
KR101743255B1
KR101743255B1 KR1020150122393A KR20150122393A KR101743255B1 KR 101743255 B1 KR101743255 B1 KR 101743255B1 KR 1020150122393 A KR1020150122393 A KR 1020150122393A KR 20150122393 A KR20150122393 A KR 20150122393A KR 101743255 B1 KR101743255 B1 KR 101743255B1
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South Korea
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side mold
molten metal
cavity
movable
stationary
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KR1020150122393A
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Korean (ko)
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KR20170025640A (en
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이명숙
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대경제이엠 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

An ultra-low speed low pressure die casting die and a casting method thereof are disclosed. The low-speed low-pressure die casting die is a stationary-side die which extends from a cavity of a cast product shape, a gate for injecting molten metal into the cavity, and one end of the stationary-side mold, A fixed-side mold having an air vent for withdrawal; And a movable-side mold including a cavity or a core opposed to the cavity of the stationary-side mold, wherein the gate and the air vent are movable in a state of being in contact with the molten metal A diameter and a length are set so that the molten metal is injected into the cavity under the conditions of a flow rate of 0.5 to 5 m / sec and a molten metal injection time of 0.5 to 2 sec. An injection pressure of 150 to 250 kgf / cm 2 and an injection rate of 0.08 to 0.6 m / sec And the filling time of the molten metal is 0.8 to 2 seconds.

Description

TECHNICAL FIELD [0001] The present invention relates to a low-speed low-pressure die casting mold and casting process,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to die casting molds and casting processes, and more particularly, to ultra low-speed and low-pressure die casting molds and casting processes.

Die casting, which is a representative casting method of lightweight materials, is one of the economical casting methods that can produce complex shaped products at once. Among them, high pressure die casting is an efficient method of casting molten metal into casting mold at high speed and high pressure.

In this die-casting step, a gate is provided in a mold, and molten metal is injected through the gate to produce a casting.

The die casting method has the advantage of obtaining a beautiful casting surface and increasing the production speed, but there is a problem that pores are easily formed in the casting because the molten metal is injected at a high speed.

The defective rate of the casting due to the occurrence of such pores can be minimized according to how the position and size of the gate are set. However, there is no clear standard and method for the concrete method to date.

Korean Patent No. 10-1518411

Accordingly, an object of the present invention is to provide an ultra-low-speed low-pressure die casting die and a casting method which are capable of obtaining die casting products of good products.

A low-speed low-pressure die casting mold according to an embodiment of the present invention is a fixed-end mold comprising: a cavity in the form of a cast product; a gate for injecting the molten metal into the cavity and a cavity extending from the cavity toward one end of the fixed- A fixed-side mold having an air vent for discharging gas in the cavities to the outside; A movable-side mold including a cavity or a core opposed to the cavity of the stationary-side mold, the movable-side mold being movable so as to be in close contact with and spaced from the stationary-side mold; And a molten metal injection unit for injecting the molten metal into the cavity through the gate, wherein the gate and the air vent are injected into the cavity under the condition that the flow rate of the molten metal is 0.5 to 5 m / sec and the injection time of the molten metal is 0.5 to 2 sec. And the casting is carried out under the conditions of an injection pressure of 150 to 250 kgf / cm 2 , an injection speed of 0.08 to 0.6 m / sec, and a filling time of the molten metal of 0.8 to 2 sec.

The air vent may be plural.

An ultra low-speed and low-pressure die casting casting method according to an embodiment of the present invention includes a mold combining step of moving a movable-side mold toward a stationary-side mold by a die casting machine to combine the movable-side mold and the stationary-side mold; The molten metal is injected and moved into the gate located at one side of the stationary side mold through the molten metal injection part to inject the molten metal into the cavity located in the stationary side metal mold. The flow rate of the molten metal is 0.5 to 5 m / sec and the injection time of the molten metal is 0.5 to 2 sec A molten metal injection step of injecting a molten metal into the cavity under the condition; An injection step of injecting the injection material while maintaining the injection pressure of 150 to 250 kgf / cm 2 , the injection speed of 0.08 to 0.6 m / sec, and the filling time of the molten metal of 0.8 to 2 sec; And separating the molded product from the movable side mold after separating the movable side mold from the fixed side mold.

In the molten metal injecting step, the gas in the cavity is discharged through a plurality of air vents provided at one side of the stationary-side metal mold.

According to the ultra low-speed low-pressure die casting mold and casting method according to the present invention, it is possible to manufacture a product having an inner porosity and an airtightness of a cast product because the product is molded by lowering the filling speed and the filling pressure. It is possible to obtain a die casting product of a good product, thereby optimizing the mold wear phenomenon, thereby extending the life of the mold.

FIG. 1A is a view showing a stationary side mold of an ultra low-speed low-pressure die casting mold according to an embodiment of the present invention.
FIG. 1B is a view showing a movable side mold of an ultra low-speed low-pressure die casting mold according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a process of an ultra low-speed and low-pressure die casting method according to an embodiment of the present invention.
FIGS. 3A to 3C are views illustrating states of respective steps of an ultra low-speed low-pressure die casting method according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an ultralow low pressure die casting die and a casting method according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

FIG. 1 is a view showing the construction of an ultra-low speed low pressure die casting mold according to an embodiment of the present invention.

Referring to FIG. 1, an ultra low-speed low-pressure die casting mold according to an embodiment of the present invention includes a stationary side mold 100, a movable side mold 200, and a melt injection unit 300.

The stationary-side mold 100 includes a cavity 110 of a cast product shape, a gate 120 for injecting molten metal into the cavity 110, a cavity 120 for supplying molten metal from the cavity 110 to the stationary-side mold 100, And an air vent 130 extending toward the one end of the cavity 110 to exhaust the gas in the cavities 110 to the outside. Here, the air vent 130 may be plural.

The movable-side mold 200 is configured to be movable so as to be in close contact with and spaced from the stationary-side mold 100. The movable side mold 200 may include a cavity or a core 210 opposed to the cavity 110 of the stationary side mold 100. Meanwhile, although not shown, the movable mold 200 may include a spin pin for taking out the molded cast product after the casting of the cast product is completed.

The molten metal injection unit 300 injects molten metal into the cavity 110 through the gate 120. The molten metal injection unit 300 includes a cylindrical injection sleeve 310 having a pouring spout 310a communicating with the cavity 110 of the stationary mold 100 and injecting molten metal therein, And may include a plunger 320 slidably inserted therein. When the molten metal is injected into the injection sleeve 310 through the pouring gate 310a, the molten metal injecting unit 300 can advance the plunger 320 to inject the molten metal into the cavity 110. [

The low-speed low-pressure die casting mold according to an embodiment of the present invention injects molten metal at low speed and low pressure, and the conditions are as follows.

The diameter and the length of the gate 120 and the air vent 130 are set such that the molten metal is injected into the cavity 110 under the conditions that the flow rate of the molten metal is 0.5 to 5 m / sec and the injection time of the molten metal is 0.5 to 2 sec. If the flow rate of the molten metal is less than 0.5 m / sec and the injection time of the molten metal is less than 0.5 sec, the discharge of the gas is easy, but the surface area of the gate 120 and the air vent 130 must be widened, Sec and the injection time of the molten metal exceeds 2 seconds, the pressure loss of the gas discharge becomes large, and sufficient gas discharge is difficult to be achieved.

According to the setting of the diameter and the length of the gate 120 and the air vent 130, casting is performed under the conditions of an injection pressure of 150 to 250 kgf / cm 2 , an injection speed of 0.08 to 0.6 m / sec, and a filling time of the molten metal of 0.8 to 2 sec .

Hereinafter, a molding method of a cast product using an ultra low-speed low-pressure die casting mold according to an embodiment of the present invention will be described. FIG. 2 is a flowchart illustrating a process of an ultra low-speed and low-pressure die casting method according to an embodiment of the present invention.

2, an ultra-low speed and low pressure die casting method according to an embodiment of the present invention includes a mold combination step S110, a melt injection step S120, an injection step S130, and a product take-out step S140 .

In the mold combination step S110, the movable-side mold 200 is moved toward the stationary-side mold 100 to combine the movable-side mold 200 and the stationary-side mold 100.

In the molten metal injecting step S120, the molten metal is injected and moved into the gate 120 located at one side of the fixed-side mold 100 through the molten metal injecting unit 300 to inject the molten metal into the cavity located in the fixed-side mold 100 . At this time, the molten metal is injected into the cavity 110 under the condition that the flow rate of the molten metal is 0.5 to 5 m / sec and the injection time of the molten metal is 0.5 to 2 sec.

In the injection step (S130), the injection material is injected while maintaining the conditions of an injection pressure of 150 to 250 kgf / cm 2 , an injection speed of 0.08 to 0.6 m / sec, and a molten metal filling time of 0.8 to 2 sec. That is, the molten metal injected into the cavity 110 has a process of cooling and solidifying.

In the product taking-out step S140, the movable mold 200 is separated from the stationary-side mold 100, and then the molded product is separated from the movable-side mold 200. [

The low-speed low-pressure die casting mold according to an embodiment of the present invention can be used for molding various products, and can be used, for example, in manufacturing a vehicle oil pan body.

The use of the ultra-low speed low pressure die casting mold according to an embodiment of the present invention enables the production of a product having an inner porosity and an airtightness of a cast product because the product is molded by lowering the filling speed and the filling pressure, And the die-casting product of a good product can be obtained by optimizing the adhesion phenomenon, thereby optimizing the mold wear phenomenon and extending the life of the mold.

On the other hand, since the casting pressure is controlled under optimal conditions, the size of the mold can be minimized to half, and the manufacturing cost of the mold can be reduced by reducing the consumed raw material.

The wear-resistant coating layer is formed on the stationary-side mold 100 and the movable-side mold 200 of the ultra low-speed low-pressure die casting mold according to an embodiment of the present invention. The abrasion resistant coating layer is composed of a mixture of 96 to 98% by weight of chromium oxide (Cr 2 O 3 ) and 2 to 4% by weight of titanium dioxide (TiO 2 ) mixed in the fixed side mold 100 and the movable side mold 200 Sprayed, made to a thickness of 50 to 600 mu m, and hardened to a plasma coating of 900 to 1000 HV.

The wear-resistant coating layer is formed by spraying powder composed of 96 to 98% by weight of chromium oxide (Cr 2 O 3 ) and 2 to 4% by weight of titanium dioxide (TiO 2 ).

The reason why the ceramic coating is applied to the outer circumferential surfaces of the stationary-side mold 100 and the movable-side mold 200 is to prevent abrasion and corrosion. Compared to chrome plating or nickel chrome plating, the ceramic coating is excellent in corrosion resistance, scratch resistance, abrasion resistance, impact resistance and durability.

Chromium oxide (Cr 2 O 3 ) acts as a passivity layer to block oxygen entering the inside of the metal, thereby preventing rusting.

Titanium dioxide (TiO 2 ) is a white pigment because it is very stable physicochemically and has high hiding power. And is also widely used for ceramics having high refractive index because of high refractive index. And has characteristics of photocatalytic property and superhydrophilic property. Titanium dioxide (TiO 2 ) acts as an air purification function, an antibacterial function, a harmful substance decomposition function, a pollution prevention function, and a discoloration prevention function. This titanium dioxide (TiO 2 ) ensures that the wear-resistant coating layer is coated on the outer circumferential surface of the stationary-side mold 100 and the movable-side mold 200 and decomposes and removes the foreign matter adhering to the wear- .

Here, chromium oxide (Cr 2 O 3) and when using hayeoseo mixing titanium dioxide (TiO 2), the mixing ratio of these, chrome oxide (Cr 2 O 3) Titanium dioxide (TiO 2) in 96-98% by weight 2 By weight to 4% by weight.

When the mixing ratio of chromium oxide (Cr 2 O 3 ) is less than 96 to 98%, the coating of chromium oxide (Cr 2 O 3 ) is often broken in an environment such as a high temperature, 100 and the outer circumferential surface of the movable side mold 200 were reduced in abruptness.

When the mixing ratio of titanium dioxide (TiO 2 ) is less than 2 to 4 wt%, the effect of titanium dioxide (TiO 2 ) is insignificant so that the purpose of mixing it with chromium oxide (Cr 2 O 3 ) is discolored. That is, titanium dioxide (TiO 2 ) decomposes and removes foreign matter adhered to the periphery of the stationary-side mold 100 and the movable-side mold 200 so that the outer peripheral surfaces of the stationary-side mold 100 and the movable- If the mixing ratio is less than 2 to 4% by weight, it takes a long time to decompose the adhered foreign matters.

The coating layer made of these materials has a thickness of 50 to 600 mu m around the outer circumferential surface of the stationary-side mold 100 and the movable-side mold 200, has a hardness of 900 to 1000 HV and a surface roughness of 0.1 to 0.3 mu m Lt; / RTI >

The abrasion resistant coating layer is sprayed with 50 to 600 占 퐉 by jetting the powdered powder and the gas at 1400 占 폚 around the periphery of the stationary-side mold 100 and the movable-side mold 200 at a Mach 2 speed .

If the thickness of the wear-resistant coating layer is less than 50 탆, the above-mentioned effect of the ceramic coating layer can not be guaranteed. If the thickness of the wear-resistant coating layer exceeds 600 탆, the above- There is a problem that working time and material cost are wasted.

The temperature of the outer circumferential surfaces of the stationary-side mold 100 and the movable-side mold 200 is raised while the wear-resistant coating layer is coated on the outer circumferential surfaces of the stationary-side mold 100 and the movable- The outer peripheral surface of the stationary-side mold 100 and the movable-side mold 200 are cooled by a cooling device (not shown) so that the temperature of the stationary-side mold 100 and the movable- do.

A sealing material made of anhydrous chromic acid (CrO 3 ) made of a metal-based glass quartz system may further be applied to the periphery of the abrasion-resistant coating layer. Anhydrous chromic acid is applied as an inorganic sealing material around a coating layer made of chromium nickel powder.

Anhydrous chromic acid (CrO 3 ) is used in places that require high abrasion resistance, lubricity, heat resistance, corrosion resistance and releasability, is not discolored in the atmosphere, has high durability, and has good abrasion resistance and corrosion resistance. The coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m. If the coating thickness of the sealing material is less than 0.3 占 퐉, the sealing material easily peels off even in a slight scratch groove, so that the above-mentioned effect can not be obtained. If the coating thickness of the sealing material is made thick enough to exceed 0.5 탆, pin holes, cracks, and the like will increase on the plated surface. Therefore, the coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m.

Therefore, since the coating layer having excellent wear resistance and oxidation resistance is formed around the outer circumferential surfaces of the stationary-side mold 100 and the movable-side mold 200, the outer circumferential surfaces of the stationary-side mold 100 and the movable- So that the service life of the stationary-side mold 100 and the movable-side mold 200 is prolonged.

On the other hand, the stationary-side mold 100 and the movable-side mold 200 are made of nodular cast iron. The nodular cast iron is heated to a temperature of 1600 to 1650 ° C to be molten, then subjected to desulfurization treatment, and subjected to spheroidizing treatment at a temperature of 1500 to 1550 ° C by adding a spheroidizing treatment agent containing magnesium in an amount of about 0.3 to 0.7% by weight.

Since nodular cast iron is a cast iron in which graphite is spherically crystallized during the solidification process by adding magnesium and the like to the molten metal of the common gray cast iron, the shape of the graphite is spherical compared to gray cast iron. Since the nodular cast iron has a small notch effect, the stress concentration phenomenon is reduced and the strength and toughness are greatly improved.

The fixed-side mold 100 and the movable-side mold 200 are manufactured by heating the nodular cast iron to 1600 to 1650 캜 to make a molten metal, and then performing a desulfurization treatment. A spheroidizing treatment agent containing about 0.3 to 0.7% And then subjected to a spheroidizing treatment at 1550 ° C followed by heat treatment.

Here, when the nodular cast iron is heated to less than 1600 ° C, the entire structure is not sufficiently melted. If the cast iron is heated above 1650 ° C, unnecessary energy is wasted. Therefore, it is preferable to heat the nodular cast iron to 1600 to 1650 ° C.

When the amount of magnesium is less than 0.3% by weight, the effect of injecting the spheroidizing agent is negligible. When the amount of magnesium is less than 0.3% by weight, the effect of injecting spheroidizing agent is insignificant. When the amount of magnesium is less than 0.3% There is a problem in that an expensive material cost is increased. Therefore, the mixing ratio of magnesium in the spheroidizing agent is preferably about 0.3 to 0.7% by weight.

When the spheroidizing treatment agent is injected into the molten nodular cast iron, it is subjected to spheroidizing treatment at 1500-1550 ° C. If the spheroidizing treatment temperature is lower than 1500 ° C., the spheroidizing treatment is not properly performed. If the spheroidizing treatment temperature is higher than 1550 ° C., the spheroidizing treatment effect is not greatly improved, but unnecessary energy is wasted. Therefore, the spheroidization treatment temperature is preferably 1500 to 1550 ° C.

Since the fixed-side mold 100 and the movable-side mold 200 are made of the nodular cast iron, the notch effect is small, so that the stress concentration phenomenon is reduced and the strength and toughness are greatly improved.

On the other hand, the air vent 130 is formed with a coating layer coated with a composition for anti-fouling coating so as to effectively prevent and remove the adhesion of contaminants. The composition for antifouling coating contains boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2, and the total content of boric acid and sodium carbonate is 1 to 10% by weight based on the total aqueous solution.

In addition, sodium carbonate or calcium carbonate may be used as the material for improving the coating property of the coating layer, but sodium carbonate is preferably used. The molar ratio of boric acid to sodium carbonate is preferably 1: 0.01 to 1: 2. If the molar ratio is out of the above range, the coating property of the substrate may be decreased or the moisture adsorption on the surface of the coating may increase.

The boric acid and sodium carbonate are preferably used in an amount of 1 to 10% by weight based on the total weight of the composition. When the amount is less than 1% by weight, the coating properties of the base material deteriorate. When the amount exceeds 10% by weight, easy to do.

On the other hand, as a method of coating the composition for antifouling coating on a substrate, it is preferable to coat it by a spray method. The thickness of the final coating film on the substrate is preferably 500 to 2000 angstroms, and more preferably 1000 to 2000 angstroms. When the thickness of the coating film is less than 500 ANGSTROM, there is a problem that it deteriorates in the case of a high-temperature heat treatment. When the thickness of the coating film is more than 2000 ANGSTROM, crystallization of the coating surface tends to occur.

Further, the composition for antifouling coating may be prepared by adding 0.1 mol of boric acid and 0.05 mol of sodium carbonate to 1000 mL of distilled water and then stirring.

Since the air vent 130 is coated with the anti-fouling coating composition, it is possible to effectively prevent and prevent the adhesion of the contaminants, thereby preventing the air vent 130 from being clogged.

Further, the outer surface of the stationary-side mold 100 can be coated with a discoloring portion whose color changes according to the temperature. The discoloring portion is coated on the surface of the stationary-side mold 100 with two or more color-change materials whose color changes when the temperature is equal to or higher than a predetermined temperature, and is separated into two or more sections according to the temperature change, And a protective film layer is coated on the discolored portion to prevent the discolored portion from being damaged.

Here, the discoloring unit is for detecting a change in the temperature of the paint by changing the color depending on the temperature of the stationary-side mold 100. [

The discoloring unit may be formed by coating a surface of the stationary-side mold 100 with a color-changing material whose color changes when the temperature of the discoloring unit is higher than a predetermined temperature. In addition, the temperature discoloring substance is generally composed of a microcapsule structure having a size of 1 to 10 탆, and the microcapsules can exhibit a colored and transparent color due to the bonding and separation phenomenon depending on the temperature of the electron donor and the electron acceptor.

In addition, the temperature-changing materials can change color quickly, have various coloring temperatures, and the coloring temperature can be easily adjusted in various ways. Such a temperature-coloring material may be various kinds of temperature-coloring materials based on principles such as molecular rearrangement of an organic compound and spatial rearrangement of an atomic group.

For this purpose, it is preferable that the discoloring portion is formed so as to be separated into two or more sections according to the temperature change by coating two or more temperature discoloring materials having different discoloration temperatures. The temperature discoloring layer can form a discolored portion by using a temperature discoloring material having a discoloration temperature higher than that of the high temperature discoloration material and a temperature discoloring material having a discoloring temperature lower than that.

Accordingly, the temperature change of the stationary-side mold 100 can be checked step by step, thereby detecting the temperature change of the coating, thereby enabling the stationary-side mold 100 to be operated in an optimal state, It is possible to prevent the side mold 100 from being damaged and to prevent the product failure due to the relatively low melting temperature.

In addition, the protective film layer is coated on the discolored portion to prevent the discolored portion from being damaged due to the external impact, and it is easily confirmed whether the discolored portion is discolored or not, and at the same time, the transparent discoloration material .

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.

100: stationary side mold 110: cavity
120: gate 130: air vent
200: movable side mold 300: molten metal injection part

Claims (4)

The fixed side mold 100 includes a cavity 110 having a cast product shape, a gate 120 for injecting the molten metal into the cavity 110, and a gate 120 extending from the cavity 110 to one side end (100) having an air vent (130) extending toward the cavity (110) to exhaust the gas in the cavities (110) to the outside;
A movable side mold (200) configured to be movable so as to be closely contactable with and spaced from the fixed side mold (100), wherein a cavity or core (210) opposed to the cavity (110) of the fixed side mold A movable-side mold 200; And
And a molten metal injection unit (300) for injecting molten metal into the cavity (110) through the gate (120)
The diameter and the length of the gate 120 and the air vent 130 are set such that the molten metal is injected into the cavity 110 under the conditions that the flow rate of the molten metal is 0.5 to 5 m / sec and the injection time of the molten metal is 0.5 to 2 sec. The casting is performed under the conditions of a pressure of 150 to 250 kgf / cm 2 , an injection speed of 0.08 to 0.6 m / sec, and a filling time of the molten metal of 0.8 to 2 sec;
The air vents 130 are plural;
A wear-resistant coating layer is formed on the stationary-side mold 100 and the movable-side mold 200. The wear-resistant coating layer contains 96 to 98% by weight of chromium oxide (Cr 2 O 3 ) and 2 to 4 And a hardness of from 900 to 1000 HV is plasma-coated, and the powder is sprayed onto the fixed-side mold 100 and the movable-side mold 200 to have a thickness of 50 to 600 mu m, A sealing material made of anhydrous chromic acid (CrO 3 ) made of a metal-based glass quartz system is further applied to the periphery of the abrasion-resistant coating layer, and the coating thickness of the sealing material is 0.3 to 0.5 탆;
The fixed-side mold 100 and the movable-side mold 200 are made of nodular cast iron. The nodular cast iron is heated to 1,600 to 1,650 캜 to be molten and then subjected to a desulfurization treatment. The magnesium is contained in an amount of 0.3 to 0.7% Followed by spheroidizing treatment at 1500~1550 ° C., followed by heat treatment;
The air vent 130 is formed with a coating layer coated with a composition for antifoulant coating. The composition for antifoulant coating includes boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2;
The discoloring unit changes color depending on the temperature on the outer surface of the stationary-side mold 100. The discoloring unit has two or more temperature-discoloring materials whose color changes when the temperature becomes a certain temperature or more, And a protective film layer is coated on the discoloring part to prevent the discoloration part from being damaged. The optical disc according to claim 1,
Ultra low speed low pressure die casting mold. delete The fixed side mold 100 includes a cavity 110 having a cast product shape, a gate 120 for injecting the molten metal into the cavity 110, and a gate 120 extending from the cavity 110 to one side end (100) having an air vent (130) extending toward the cavity (110) to exhaust the gas in the cavities (110) to the outside; A movable side mold (200) configured to be movable so as to be closely contactable with and spaced from the fixed side mold (100), wherein a cavity or core (210) opposed to the cavity (110) of the fixed side mold A movable-side mold 200; And a molten metal injection unit 300 for injecting the molten metal into the cavity 110 through the gate 120. The gate 120 and the air vent 130 are disposed at a flow rate of 0.5 to 5 m / A diameter and a length are set so that the molten metal is injected into the cavity 110 under the condition of the injection time of the molten metal of 0.5 to 2 seconds, the injection pressure is 150 to 250 kgf / cm 2 , the injection rate is 0.08 to 0.6 m / The casting is performed under the condition of 0.8 to 2 sec; The air vents 130 are plural; A wear-resistant coating layer is formed on the stationary-side mold 100 and the movable-side mold 200. The wear-resistant coating layer contains 96 to 98% by weight of chromium oxide (Cr 2 O 3 ) and 2 to 4 And a hardness of from 900 to 1000 HV is plasma-coated, and the powder is sprayed onto the fixed-side mold 100 and the movable-side mold 200 to have a thickness of 50 to 600 mu m, A sealing material made of anhydrous chromic acid (CrO 3 ) made of a metal-based glass quartz system is further applied to the periphery of the abrasion-resistant coating layer, and the coating thickness of the sealing material is 0.3 to 0.5 탆; The fixed-side mold 100 and the movable-side mold 200 are made of nodular cast iron. The nodular cast iron is heated to 1,600 to 1,650 캜 to be molten and then subjected to a desulfurization treatment. The magnesium is contained in an amount of 0.3 to 0.7% Followed by spheroidizing treatment at 1500~1550 ° C., followed by heat treatment; The air vent 130 is formed with a coating layer coated with a composition for antifoulant coating. The composition for antifoulant coating includes boric acid and sodium carbonate in a molar ratio of 1: 0.01 to 1: 2; The discoloring unit changes color depending on the temperature on the outer surface of the stationary-side mold 100. The discoloring unit has two or more temperature-discoloring materials whose color changes when the temperature becomes a certain temperature or more, And a protective layer is coated on the discoloring portion to prevent the discoloration portion from being damaged. In addition, the discoloring portion is coated with a protective film layer on the discoloring portion, As a low speed low pressure die casting casting method,
A mold combining step (S110) of moving the movable-side mold toward the stationary-side mold by a die-casting machine to combine the movable-side mold and the stationary-side mold;
The molten metal is injected and moved into the gate located at one side of the stationary side mold through the molten metal injection part to inject the molten metal into the cavity located in the stationary side metal mold. The flow rate of the molten metal is 0.5 to 5 m / sec and the injection time of the molten metal is 0.5 to 2 sec A molten metal injection step (S120) of injecting molten metal into the cavity (110);
An injection step (S130) of injecting the injection material while maintaining the conditions of an injection pressure of 150 to 250 kgf / cm 2 , an injection speed of 0.08 to 0.6 m / sec, and a filling time of the molten metal of 0.8 to 2 sec;
(S140) of separating the molded product from the movable-side mold after separating the movable-side mold from the fixed-side mold;
Wherein the gas in the cavity is discharged through a plurality of air vents provided at one side of the stationary-side mold at the step of injecting the molten metal.
Ultra Low Speed Low Pressure Die Casting Casting Method. delete
KR1020150122393A 2015-08-31 2015-08-31 Low speed low-pressure die-casting molds and casting process KR101743255B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000052016A (en) * 1998-08-12 2000-02-22 Nippon Light Metal Co Ltd Method of manufacturing die-cast products with less casting defects
KR200274711Y1 (en) 2002-02-21 2002-05-04 김헌규 Diecast mould

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KR101518411B1 (en) 2014-03-17 2015-05-07 이권열 Die casting mold having high density compressed filling up structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000052016A (en) * 1998-08-12 2000-02-22 Nippon Light Metal Co Ltd Method of manufacturing die-cast products with less casting defects
KR200274711Y1 (en) 2002-02-21 2002-05-04 김헌규 Diecast mould

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