KR20190023453A - High vacuum system for forming die-casting - Google Patents

Abstract

The present invention relates to an evacuation system for a die-casting mold using a high pressure process of high vacuum die-casting, capable of minimizing bubble defect. According to the present invention, the evacuation system for a die-casting mold comprises: a mold module having a product cavity formed therein; a sleeve disposed in a state of communicating with the mold module; a plunger coupled to be able to move along the sleeve in one direction; and a vacuum module coupled to the mold module to maintain a vacuum state of the mold module when a product is molded. The vacuum module comprises: a vacuum valve disposed to communicate with the upper side of the vacuum module; a vacuum tank connected to the vacuum valve through a vacuum hose; a first suction filter disposed between the vacuum tank and the vacuum valve; a vacuum pump coupled to the vacuum tank to form a vacuum pressure; a second suction filter disposed between the vacuum pump and the vacuum tank; and a sleeve vacuum hose having one end disposed to communicate with the sleeve and coupling the other end to the first suction filter to evacuate air existing in the sleeve.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high vacuum system for forming die casting,

The present invention relates to a vacuum exhaust system for a die casting mold using a high vacuum die casting high pressure process and more particularly to a vacuum casting die casting process using a high vacuum die casting high pressure process capable of minimizing bubble defects in a die casting part formed by applying vacuum exhaust in a die casting process To a vacuum exhaust system of a die casting mold.

In general, die casting, also called die casting, is a precision casting method in which molten metal is injected into a precisely machined forced die to exactly match the required cast shape to obtain the same casting as the die. The product manufactured by such die casting casting has an advantage that it is not required to be reworked because the dimension is accurate, and also the mechanical property is excellent and mass production is possible. In addition, metal used in die casting casting is mainly made of zinc, aluminum, tin, copper, magnesium and other alloys. It is widely used for automobile parts, electric appliances, optical instruments, vehicles, textile machines, And many other products are being produced throughout the industry.

In the conventional die casting casting as described above, when the molten metal is injected into the mold, gas is generated while the molten metal is connected to the air inside the mold, and bubbles are generated in the material due to the gas, .

High-pressure die casting is a process in which a molten metal is charged into a mold in a very short time by a plunger advancing at high speed, and the molten metal is charged in a turbulent state. On the other hand, due to the speed problem of the plunger, turbulence may be generated and charging failure may be caused. In addition, air and gas existing in the molten metal injection part (including the sleeve and the runner) It may be generated as air bubbles to cause defects inside the product.

The bubbles in the product have a problem of lowering the mechanical properties and lowering the high strength characteristics and the weldability in various industrial fields including the automobile industry requiring large-sized aluminum parts.

Reference can be made to Patent Document No. 10-1362700 (Feb. 14, 2014) as a conventional document which suggests a high-vacuum die casting mold structure. The present invention discloses a cylindrical steam reformer for producing a reformed gas containing hydrogen as a main component by steam reforming a hydrocarbon-based fuel such as city gas or LPG.

The above-mentioned document is a mold structure for molding a high-performance molded article such as an automobile product such as a cylinder block or a cylinder head of an air compressor for an electric vehicle or a refrigerator compressor. The plunger continuously advances in the step of pressure- And a thermal expansion for reducing bubbles in the gate portion is taken into consideration. However, there is a limitation in disclosing a method for providing a high vacuum device for molding a die-casting component for molding a high-strength and light- have.

Also, since air in the slab is transferred to the mold module and then removed through the vacuum module, a small amount of air is supplied to the mold module There may arise a problem in that a problem arises.

(Korean Patent No. 10-1362700, February 14, 2014)

The present invention relates to a vacuum exhaust system for a die casting mold using a high vacuum die casting high pressure process, and more particularly, to a die casting mold using a high vacuum die casting high pressure process capable of minimizing bubble defects in a die casting part formed by applying vacuum exhaust in a die casting process. And a vacuum exhaust system.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a vacuum exhaust system of a die casting mold using a high-vacuum die casting high-pressure process for manufacturing a vehicle component using an aluminum alloy (Al-Alloy) according to an embodiment of the present invention includes a mold module ; A sleeve disposed in communication with the mold module; A plunger movably coupled in one direction along the sleeve; And a vacuum module coupled to the mold module to maintain a vacuum state therein when the product is molded in the mold module, wherein the vacuum module comprises a vacuum valve communicably disposed above the vacuum module; A vacuum tank connected to the vacuum valve through a vacuum hose; A first suction filter disposed between the vacuum tank and the vacuum valve; A vacuum pump for forming vacuum pressure to be coupled to the vacuum tank; A second suction filter disposed on the vacuum tank and on the vacuum tank; And a slit part vacuum hose which is disposed at one end to communicate with the slit part and whose other end is coupled to the first suction filter to exhaust air present in the slit part.

In this embodiment, the plunger has a position sensor for confirming the position of the plunger, and the molten metal in the sleeve portion can be supplied to the mold module while changing the moving speed according to the position of the plunger identified through the position sensor.

In this embodiment, the mold module is provided with a movable mold and a stationary mold, and may include a mil-fin arranged to facilitate detachment of a product formed in the movable mold.

The vacuum exhaust system of the die casting mold using the high vacuum die casting high pressure process according to the present invention can minimize the amount of air moved to the mold module along the sleeve by firstly removing the air in the sleeve in advance, It is possible to more effectively apply the vacuum exhaust in the die casting process, thereby minimizing bubble defects in the molded die casting part, thereby forming a product having excellent quality.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a system diagram of a vacuum exhaust system of a die casting mold using a high-vacuum die casting high-pressure process according to an embodiment of the present invention.
2 is a view showing a process flow chart of a high-vacuum die casting high-pressure process according to an embodiment of the present invention.
FIG. 3 is a photograph conceptually showing that air is generated in the step (a) of FIG.
FIG. 4 is a photograph comparing a product formed by a high-vacuum die casting high-pressure process system according to an embodiment of the present invention and a non-applied product.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

Also, throughout the specification, when an element is referred to as " including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. Also, throughout the specification, the term " on " means located above or below a target portion, and does not necessarily mean that the target portion is located on the upper side with respect to the gravitational direction.

FIG. 1 is a system view of a vacuum exhaust system of a die casting die using a high vacuum die casting high pressure process according to an embodiment of the present invention, FIG. 2 is a view showing a process flow chart of a high vacuum die casting high pressure process according to an embodiment of the present invention, 3 is a photograph conceptually showing that air is generated in the step (a) of FIG.

1 to 3, a vacuum exhaust system of a die casting mold using a high vacuum die casting high pressure process is used to manufacture a vehicle component using an aluminum alloy (Al-Alloy), and includes a mold module 110, a sleeve 120 ), A plunger 130, and a vacuum module 140.

The mold module 110 is formed with a product cavity, and is formed as a pair so as to be in contact with each other, and may be formed of a stationary mold 110a and a movable mold 110b. The movable mold 110b may be formed with a plurality of spin pins 110b formed in a direction perpendicular to the longitudinal direction of the stationary mold 110 to facilitate separation of the product after the product is completed. The microneedle 110b can smoothly remove the molded product by applying pressure in the vertical direction of the product.

A gate runner (not shown) is formed to facilitate the inflow of the molten metal transferred through the sleeve 120 when the mold module 110 has a cavity for forming a rear floor of the vehicle, The gate runner can be branched and formed into a branched shape for filling a uniform molten metal. At this time, approximately 16 to 18 gate runners are formed, so that injection can be more smoothly provided to the cavity.

The sleeve 120 is disposed in communication with the mold module 110. The sleeve 120 is disposed in communication with the mold module 110 so that a space is formed therein to receive molten aluminum therein (hereinafter referred to as molten metal) and to receive molten metal along the mold module 110. At this time, a vacuum hose 146 disposed in communication with the sleeve 120 is disposed, and the vacuum hose 146 will be described later in detail.

The plunger 130 moves in one direction along the space formed inside the sleeve 120 to transfer the molten metal in the sleeve 120 to the mold module 110. When the plunger 130 reaches the "B" position, the operation of the vacuum module 140 is started. When the plunger 130 reaches the "D" The speed is changed to increase.

At this time, the plunger 130 includes a plunger position sensor 131 for confirming the position of the plunger 130 moving along one direction. The plunger position sensor 131 confirms the position of the plunger 130 moving in one direction and the control unit controls the moving speed of the plunger 130 moving according to the position of the sensed plunger 130 The molten metal can be smoothly introduced into the mold module 110. Preferably, the control unit (not shown) may operate the plunger 130 in the order of low speed, high speed, and pressure increasing, but the operation method thereof is not limited thereto.

The vacuum module 140 is coupled to the mold module 110 to maintain the interior of the mold module 110 in a vacuum state when the product is molded in the mold module 110 and includes a vacuum valve 141, a vacuum tank 142, A vacuum pump 144, a second suction filter 145, a sleeve vacuum hose 146, and a vacuum pressure sensing unit 147. The vacuum pump 144,

The vacuum valve 141 is disposed so as to communicate with the upper side of the mold module 110. The air inside the mold module 110 is discharged to the outside through the vacuum valve 141 to prevent the formation of pores when the product is molded in the mold module 110 so that the product can be manufactured more firmly and precisely can do.

The vacuum tank 142 is connected via a vacuum hose H.

The first suction filter 143 is coupled to the vacuum hose H so as to primarily remove foreign substances other than air supplied through the vacuum hose H to prevent foreign matter from accumulating in the vacuum tank 142.

The vacuum pump 144 is connected to the vacuum tank 142 and the vacuum pump 144 is provided between the vacuum tanks 142 to form a second suction filter 145 to remove foreign matter. Therefore, it is possible to induce the entire facility of the vacuum module 140 to be stably used through the removal of the impurities from the first and second order.

The vacuum hose 146 is disposed at one end to communicate with the sleeve portion 120 and the other end to the first suction filter 146. As shown in FIG. 3, when the molten metal is poured into the sleeve 120, air (a) is formed. The air (a) flows together with the molten metal into the mold module 110, (130). ≪ / RTI >

At this time, the vacuum hose 146 primarily discharges the generated air in advance before it is transferred to the mold module 110. This minimizes air present in the sleeve 120 when the molten metal is transferred to the mold module 110 through the plunger 130. Therefore, when the product is molded by injecting the molten metal into the mold module 110 through the plunger 130, since the product is molded in a state where the remaining air is minimized, it is possible to form a product having a clean and high- (See FIG. 4).

On the other hand, when the plunger 130 reaches the position of B in Fig. 1, the vacuum hose 146 is stopped to prevent the supply of the molten metal along the vacuum hose 146.

When the vacuum is formed through the vacuum pump 144, the vacuum pressure sensing unit 147 senses whether or not the generated pressure maintains a predetermined range. If it is determined that the sensed pressure range is out of the predetermined range, the control unit (not shown) suspends the operation of the vacuum pump 144 and the operation of the plunger 130. Then, the control unit drives an alarm unit (not shown) to form an alarm, and notifies the manager so that the vacuum pump 144 can be normally operated. At this time, the controller can provide the alarm to the manager through the wireless communication system more quickly through the mobile system or the wireless network system disposed in the factory.

As described above, the vacuum exhaust system of the die casting mold using the high vacuum die casting high pressure process according to the present invention sufficiently exhausts the inside of the cavity with a vacuum pump or the like to reduce the gas to be pushed, thereby eliminating bubble defects. In addition, the product group obtained through the high-vacuum die casting process can manufacture a large-area thin-walled product compared with the general high-pressure die casting product group, and can be lightened by high strength.

In addition, it can be applied to structural parts by welding and heat treatment, and it is possible to manufacture large-sized parts as well as to form thin-walled products. In addition, since the impregnation process can be eliminated, it can be applied to large parts requiring welding characteristics and high strength properties such as automobile structural parts and bodies.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of the present invention in order to facilitate description of the present invention and to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

110: mold module
110a: Fixed mold
110b: movable mold
110c:
120: Sleeve
130: plunger
131: plunger position sensor
140: Vacuum module
141: Vacuum valve
142: Vacuum tank
143: First suction filter
144: Vacuum pump
145: second suction filter
146: Sleeve Vacuum Hose
147: Vacuum pressure sensing part

Claims (3)

A vacuum exhaust system for a die casting mold using a high-vacuum die casting high-pressure process for manufacturing a vehicle component using an aluminum alloy (Al-Alloy)
A mold module in which a product cavity is formed;
A sleeve disposed in communication with the mold module;
A plunger movably coupled in one direction along the sleeve; And
And a vacuum module coupled to the mold module to maintain a vacuum in the mold when the product is molded in the mold module,
In the vacuum module,
A vacuum valve disposed in communication with the upper side of the mold module;
A vacuum tank connected to the vacuum valve through a vacuum hose;
A first suction filter disposed between the vacuum tank and the vacuum valve;
A vacuum pump for forming a vacuum pressure to be coupled to the vacuum tank;
A second suction filter disposed on the vacuum pump and the vacuum tank; And
And a sleeve-type vacuum hose having one end connected to the slit portion and the other end coupled to the first suction filter to exhaust air existing in the slit portion. The die casting mold according to claim 1, Of the vacuum exhaust system. The method according to claim 1,
The plunger,
And a position sensor for confirming the position of the plunger,
And the molten metal in the slit portion is supplied to the mold module while changing the moving speed according to the position of the plunger identified through the position sensor. The vacuum exhaust system of the die casting mold using the high vacuum die casting high pressure process. The method according to claim 1,
The mold module includes:
A vacuum exhaust system for a die casting mold using a high vacuum die casting high pressure process, which comprises a movable mold and a fixed mold, and a mil fin disposed to facilitate detachment of a product formed in the movable mold.

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