KR20080081463A - Injection sleeve cooling system for die casting - Google Patents

Abstract

The present invention relates to an injection sleeve cooling system for die casting, and more particularly, a sleeve body having a molten metal moving passage formed therein and having a plurality of first longitudinal cooling passages disposed in a circumferential direction, and a second longitudinal cooling passage having a length. A sleeve biscuit portion extending in the circumferential direction and circumferentially spaced in the circumferential direction and interconnecting the connecting portions between the first and second longitudinal cooling passages, the sleeve biscuit portion extending in the circumferential direction of the sleeve body; Cooling water inlets and cooling water outlets connected to one end and the other end of the circumferential cooling flow path and exposed to one side of the sleeve biscuit part, respectively, to allow the inflow and outflow of the cooling water to the second longitudinal cooling flow path, and the first and In a configuration including a cooling water separator installed inside the second longitudinal cooling flow path, as the sleeve cooling is made smoothly, This reduces production cycle time and improves product quality and productivity.

Description

Cooling system of injection sleeve for die casting

Figures 1a and 1b is a state diagram showing the state before and after the operation of the die casting machine according to the prior art, respectively.

Figure 2 is a longitudinal cross-sectional view of the die casting injection sleeve according to the prior art.

Figure 3 is a block diagram of the die casting injection sleeve cooling system according to the present invention installed in the mold.

Figure 4 is a longitudinal sectional view showing the die-casting injection sleeve cooling system for cutting according to the present invention.

FIG. 5 is a cross-sectional view of the die casting injection sleeve cooling system corresponding to the portion “A-A” of FIG. 4;

※ Code explanation for main part of drawing ※

100: sleeve body 110: first longitudinal cooling flow path

120: molten metal moving path 200: sleeve biscuit part

210: second longitudinal cooling flow path 220: circumferential cooling flow path

300: cooling water inlet 400: cooling water outlet

500: cooling water separator 600: longitudinal blocking plug

700: circumferential blocking plug

The present invention relates to an injection sleeve cooling system for die casting, wherein a longitudinal cooling water channel and a circumferential cooling channel are formed in the sleeve biscuit portion of the sleeve body to which the molten metal is pressurized, thereby reducing the solidification time of the molten metal as the sleeve is smoothly cooled. The present invention relates to an injection sleeve cooling system for die casting, which can improve product quality.

In general, die casting is a precision casting method in which a molten metal such as aluminum or magnesium is injected into a mold that is precisely machined to match a desired casting shape, and thus a casting is obtained. It is rarely used and is widely used because of its excellent mechanical properties and mass production of molded products.

Figures 1a and 1b is a view showing a state before and after the operation of the die casting machine according to the prior art, respectively, Figure 2 is a view showing the injection sleeve for die casting according to the prior art.

As shown in FIGS. 1A to 2, the die casting method according to the conventional die casting method has a hollow injection sleeve 30 in which molten metal is injected is installed adjacent to the mold 10, and a plunger tip is inserted in the injection sleeve 30. The plunger rod combined with the 20 is installed to reciprocately move, and when the molten metal 40 is injected into the hollow portion of the injection sleeve 30, the molten metal 40 is pressed by the movement of the plunger tip 20. The pressurized molten metal is pressed into the mold 10 via the hollow portion of the injection sleeve 30 and solidified in the mold 10 after a predetermined time has elapsed. Thereafter, the plunger tip 20 is moved to its original position. When the molten metal 40 is injected into the injection sleeve 30 again, the casting operation cycle is repeated by the same process described above.

The injection sleeve 30 is heated to a high temperature by the molten metal 40 while repeatedly performing the casting operation as described above. If the heated injection sleeve 30 is not rapidly cooled, the injection sleeve 30 is thermally expanded. The shape may be deformed, such that a gap is generated between the plunger tip 20 and the inner circumferential surface of the injection sleeve 30, thereby reducing the pressing force of the molten metal 40 by the plunger tip 20, and thus the plunger tip 20. The reciprocating motion of) may also cause trouble. In order to solve this problem, the conventional injection sleeve 20 is formed by extending the cooling passage 31 in the circumferential direction by using the cooling water inlet and outlet through the cooling inlet 32 and the cooling outlet 33. Allow heating to cool.

However, in the case of the conventional injection sleeve 30, as the cooling flow path 31 is formed in the body portion (intermediate position of the injection sleeve) of the injection sleeve 30, the injection sleeve (actually high pressure is produced by the pressure of the molten metal ( 30), in particular, the biscuit part having the thickest melt thickness does not have a problem in that cooling of the actual injection sleeve is not performed smoothly. As a result, the solidification time of the molten metal becomes long, which causes a limit in shortening the production cycle time, and there is a problem that the product quality is degraded.

An object of the present invention is to solve the above-mentioned problems of the prior art, to provide an injection sleeve cooling system for die casting to improve the product quality by allowing the cooling of the molten metal to the injection sleeve in which the molten metal is pressed.

In order to achieve the above object, the present invention provides a molten metal moving passage penetrating the inner side so that the molten metal is moved to the mold by a reciprocating motion by the plunger tip, and the first longitudinal cooling passage extending in the longitudinal direction is circumferentially formed. A plurality of sleeve bodies spaced apart; Protruding from the front end of the sleeve body is pressed by the plunger tip is made, the second longitudinal cooling flow path is formed in the longitudinal direction in communication with the first longitudinal cooling flow path on the same axis, the circumferential direction A sleeve biscuit portion having a circumferential cooling passage extending in a circumferential direction of the sleeve body such that the connection portions between the first and second longitudinal cooling passages spaced apart from each other are connected to each other; A coolant inlet and a coolant outlet respectively connected to one end and the other end of the circumferential cooling passage to expose one side of the sleeve biscuit part to allow inlet and outlet of coolant to the first and second longitudinal cooling passages; And a coolant separator installed inside the first and second longitudinal cooling flow paths so that the flow of the coolant flows.

In this case, the first longitudinal cooling flow path is formed in the rear end of the sleeve body, the longitudinal blocking plug for preventing leakage of cooling water is installed at the inlet position of the first longitudinal cooling flow path to the sleeve body, The circumferential cooling flow path is composed of a plurality of straight flow paths extending in a straight line along the circumferential direction of the sleeve biscuit part, the circumferential direction for preventing leakage of cooling water at the exposed end of the straight flow path exposed to the side surface of the sleeve biscuit part A plug plug can be inserted and installed. In addition, the coolant separator is preferably in the form of a flat plate bar that divides the first and second longitudinal cooling passages in the longitudinal direction.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a view showing a configuration in which the die casting injection sleeve cooling system according to the present invention is installed in the mold, Figure 4 is a view showing the die casting injection sleeve cooling system according to the present invention, Figure 5 is a view of FIG. FIG. 1 is a view illustrating a die-cast injection sleeve cooling system corresponding to an “AA” section.

As shown in FIGS. 3 to 5, the present invention includes a sleeve body 100 in which a plurality of first longitudinal cooling passages 110 extend in a longitudinal direction, and the first longitudinal cooling passages 110. A second sleeve cooling passage 210 is connected in the longitudinal direction and the circumferential cooling passage 220 is formed in the sleeve biscuit portion 200 extending in the circumferential direction of the sleeve body 100, and the first and second type Cooling water inlet 300 and the cooling water outlet 400 for inflow and outflow of the cooling water into the direction cooling passages 110 and 210, and the first and second longitudinal cooling passages to induce the flow of the inlet cooling water ( 110), 210 is a structure including a cooling water separator 500 is installed inside the.

Specifically, the sleeve body 100 has a hollow cylindrical shape disposed adjacent to the mold so that the injection molten metal can be press-fitted into the mold in which the casting operation is performed, the molten metal moving path 120 in which the injection molten metal is moved to the inside thereof. It penetrates in the direction, the plunger tip 20 for pressing the injection molten metal into the mold in the molten metal moving path 120 of the sleeve body 100 is inserted into the reciprocating movement.

In addition, a plurality of first longitudinal cooling passages 110 are formed in the longitudinal direction of the sleeve body 100 along the circumferential direction, and the first longitudinal cooling passages 110 are heated by injection molten metal. It is for cooling the sleeve body 100, is inserted in the front end direction from the rear end of the sleeve body 100 is formed extending in the longitudinal direction. At this time, a longitudinal blocking plug 600 is inserted into the inlet position (inlet) of the first longitudinal cooling passage 110 with respect to the sleeve body 100 to prevent leakage of the cooling water.

The sleeve biscuit part 200 is protruded in the longitudinal direction at the front end of the sleeve body 100. The sleeve biscuit portion 200 is a portion corresponding to the portion of the biscuit where the actual high pressure is formed when the molten metal is pressed by the plunger tip 20 to increase the thickness of the molten metal, and the same as that of the first longitudinal cooling flow path 110. A second longitudinal cooling flow path 210 extending on the axis extends in the longitudinal direction. Here, the biscuit refers to a shape in which the molten molten metal is cast in the shape of the product through a cylindrical injection sleeve, and the molten metal generated in the shape of the injection tip pushing the molten molten metal into the thickest shape.

In particular, the second longitudinal cooling flow path 210 is formed in the circumferential direction of the sleeve biscuit part 200 so as to correspond to the plurality of first longitudinal cooling flow paths 110 disposed in the circumferential direction of the sleeve body 100. A plurality of circumferential cooling passages 220 are formed to be connected to the connecting portions between the first and second longitudinal cooling passages 110 and 210 spaced apart in the circumferential direction.

The circumferential cooling passage 220 is for longitudinal and circumferential movement of the inlet coolant with respect to the sleeve body 100 and the sleeve biscuit 200, and the first and second longitudinal cooling passages spaced apart in the circumferential direction. The connection portion between the 110 and 210, but is connected to each other, it is composed of a plurality of straight passages 221 extending in linear communication along the circumferential direction of the sleeve biscuit portion (200). In this case, the connection portions of the first and second longitudinal cooling passages 110 and 210 are shared to the connection portions where the plurality of straight passages 221 communicate with each other, and the side surfaces of the sleeve biscuit portion 200 are shared. At the exposed end of the straight passage 221 exposed to the circumferential blocking plug 700 for preventing leakage of the cooling water is inserted.

In particular, a coolant inlet 300 is formed at any one of the exposed ends of the straight passage 221 so that the coolant flows into the first and second longitudinal cooling passages 110 and 210. The other one of the exposed end of the flow path 221 is formed with a coolant outlet 400 for discharging the coolant introduced through the coolant inlet 300. In this embodiment, the coolant inlet 300 and the coolant outlet ( 400 is preferably formed at each of the exposed ends of the straight channel 221 exposed in one direction of the sleeve biscuit part 200. At this time, the cooling water inlet 300 and the cooling water outlet 400 may be connected to the cooling water pipe 800 connected to the cooling water supply source.

On the other hand, inside the first and second longitudinal cooling flow paths 110 and 210, a cooling water separator 500 for separating the space in the longitudinal direction is installed. The cooling water separator 500 is for inducing the flow of the cooling water introduced through the circumferential cooling flow path 220, and is formed in a flat plate bar shape to form the first and second longitudinal cooling flow paths 110, ( 210 is inserted into the inside. Thus, the coolant introduced into the first and second longitudinal cooling passages 110 and 210 through the circumferential cooling passage 220 is connected to the first and second longitudinal cooling passages through the coolant separator 500. After the reciprocating movement in the longitudinal direction of (110), (210), the other first and second longitudinal cooling flow paths (110), 210 which are spaced apart in the circumferential direction again through the circumferential cooling flow path (220) Will be moved to. As a result, the coolant separator 500 allows the coolant flow smoothly from the coolant inlet 300 to the coolant outlet 400.

Referring to the operation of the present invention made of such a configuration as follows.

First, when the molten metal 40 flows into the molten metal moving path 120 of the sleeve body 100, the molten metal 40 from the inner side of the sleeve biscuit part 200 to the mold 10 by the pressure of the plunger tip 20. Indentation is made, and after a predetermined time, the molten metal solidifies in the mold 10. Thereafter, the plunger tip 20 is moved to the original position, and when the molten metal flows back into the injection sleeve, the process of pressing the introduced molten metal 40 into the mold is repeated.

At this time, the coolant flows through the first longitudinal cooling passage 110 and the second longitudinal cooling passage 210 of the sleeve body 100 and the sleeve biscuit part 200, and the cooling water is repeatedly formed by casting. The sleeve body 100 and the sleeve biscuit part 200 to be heated are cooled.

That is, when the coolant is introduced through the coolant inlet 300, the coolant flows to the connection positions of the first and second longitudinal cooling passages 110 and 210 along the circumferential cooling passage 220. In addition, the coolant separator 500 reciprocates the first and second longitudinal cooling passages 110 and 210. Subsequently, the coolant having moved the first and second longitudinal cooling passages 110 and 210 may be spaced apart from each other in the circumferential direction of the sleeve body 100 along the circumferential cooling passage 220. It moves to the second longitudinal cooling flow path (110, 210). The cooling water moves the plurality of first and second longitudinal cooling passages 110 and 210 spaced apart along the circumferential direction of the sleeve body 100 to cool the sleeve body 100 heated by the molten metal. It is finally discharged to the outside through the cooling water outlet 400.

As described above, in the case of the die casting injection sleeve cooling system of the present invention, the cooling of the sleeve is smoothly performed even by the distribution of the coolant even in the biscuit having the thickest melt thickness, thereby shortening the production cycle time by reducing the melt solidification time. The advantage is that you can. Thus, the present invention can solve the problem of the prior art that the cooling is not made smoothly because the cooling water is not distributed to the biscuit portion where the molten metal thickness is formed thickest.

While the invention has been shown and described with respect to specific embodiments thereof, it will be appreciated that the invention can be variously modified and varied without departing from the spirit or scope of the invention as provided by the following claims. It will be obvious to those of ordinary skill.

As described above, according to the present invention, as the sleeve cooling is smoothly performed by the distribution of the cooling water even in the biscuit portion having the thickest melt thickness, the production cycle time is shortened by shortening the solidification time of the molten metal. This has the advantage of improving quality and productivity.

Claims (4)

A plurality of first longitudinal cooling passages 110 are formed in the circumferential direction so that the molten metal moving passage 120 penetrates the inner side so that the molten metal is moved to the mold by a reciprocating motion by the plunger tip. Sleeve body 100 to be; Protruding to the front end of the sleeve body 100 is melt pressure by the plunger tip is made, the second longitudinal cooling flow path 210 is in communication with the first longitudinal cooling flow path 110 on the same axis line length Extending in the circumferential direction, the circumferential cooling flow path 220 for interconnecting the connecting portion between the first and second longitudinal cooling flow paths 110, 210 are arranged in the circumferential direction extending in the circumferential direction Being sleeve biscuit portion 200; The first and second longitudinal cooling passages 110 and 210 are respectively connected to one end and the other end of the circumferential cooling passage 220 so that inflow and outflow of cooling water is made. Cooling water inlet 300 and the cooling water outlet 400 exposed on one side; An injection sleeve cooling system for die casting, comprising: a coolant separator (500) installed inside the first and second longitudinal cooling passages (110) and (210) to guide the flow of introduced coolant. According to claim 1, wherein the first longitudinal cooling flow path 110 is formed at the rear end of the sleeve body 100, the retracted position of the first longitudinal cooling flow path 110 with respect to the sleeve body (100) The injection molding cooling system for die casting, characterized in that the longitudinal plug plug 600 is installed to prevent leakage of the coolant. According to claim 1 or claim 2, The circumferential cooling flow path 220 is composed of a plurality of straight flow paths 221 extending in linear communication along the circumferential direction of the sleeve biscuit portion 200, the sleeve An injection sleeve cooling system for die casting, characterized in that the circumferential blocking plug 700 is inserted into the exposed end of the straight passage 221 exposed on the side surface of the biscuit part 200 to prevent leakage of cooling water. The die casting of claim 1 or 2, wherein the coolant separator 500 has a flat plate bar shape that divides the first and second longitudinal cooling passages 110 and 210 in the longitudinal direction. Injection sleeve cooling system.

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