KR20100110980A - Diecasting mold device - Google Patents

Abstract

PURPOSE: A die casting mold device is provided to improve cooling performance by installing a cooler of coil shape in the inside of a mold. CONSTITUTION: A mold casting mold device comprises an upper mold(210), a low mold(220) and a coil type cooler(240). The upper and lower mold has cavity corresponding to the shape of product, respectively. The low mold faces to the upper mold. The coil type cooler is formed apart from the cavity as fixed distance. A cooling water inlet(241) is connected to one side of the coil type cooler. A cooling water outlet(242) is connected to the other side of the coil type cooler.

Description

Die casting mold device {DIECASTING MOLD DEVICE}

The present invention relates to a die casting mold apparatus, and more particularly, a cooler is installed inside the mold, and the coolant warmed while passing through the cooler is recycled back to the inside of the mold along the heating line, and a ball is poured into one side of the mold. The present invention relates to a die casting mold apparatus provided with a runner cutter for cutting a runner.

In general, diecasting is a precision casting method in which molten metal is injected into a steel mold that is accurately machined to perfectly match the required casting shape. The product is called diecast casting.

This die casting has the characteristics of excellent mechanical properties and mass production, in addition to the advantage that almost no need to be polished because the casting dimensions are accurate, the metal used is an alloy of zinc, aluminum, tin, copper, etc. The product is cast by solidifying by injecting by air casting, hydraulic pressure, hydraulic pressure, etc. using a cast casting machine.

Here, as shown in FIG. 1, the die casting mold is provided with the stationary mold 1 and the movable mold 3 movable with respect to the stationary mold 1, and the stationary mold 1 and movable. When shaping the die 3, the cavity 5 is formed therein.

In addition, a sleeve tube 7 for injecting molten metal is installed at one lower side of the movable mold 3, and a piston 11 of the injection cylinder 9 is disposed in the sleeve tube 7.

Therefore, after injecting molten metal into the sleeve tube 7 in a state in which the stationary mold 1 and the movable mold 3 are combined (S11), when the injection cylinder 9 is driven forward, the sleeve tube 7 The inside of the molten metal is injected into the cavity 5 through the molten metal 13 between the fixed mold 1 and the movable mold 3 (S12).

After cooling for a predetermined time in this state, the movable mold 3 is released from the stationary mold 1 to produce the casting 20 (S13).

As described above, in the conventional die casting mold apparatus, since the molten metal is gradually filled from the lower side of the cavity to the upper side of the mold, it is necessary to inject the molten metal at a considerably high pressure, and the temperature difference between the lower and upper portions of the cavity is increased. Due to the difference in cooling rate, the problem of product defects may occur.

On the other hand, in the case of a runner (filler) filled in the molten metal of the mold and hardened as it is, a cutting operation for releasing the product from the mold and then cutting it again has a problem of cost and time consumption.

The present invention is to solve the problems as described above, an embodiment of the present invention, in the die casting mold apparatus, the upper mold, the upper mold is formed to form a cavity corresponding to the product shape, the upper mold facing and corresponding to the product shape It is associated with the die casting mold apparatus including a lower mold in which the cavity is formed, and a coil-shaped cooler spaced apart from the cavity by a predetermined distance, and having a cooling water inlet connected to one side and a cooling water outlet connected to the other side.

According to one embodiment of the invention, in the die-casting mold apparatus, the upper mold is formed in the cavity corresponding to the product shape, the lower mold facing the upper mold and the cavity corresponding to the product shape is formed, and a predetermined distance from the cavity Is formed in a coil shape spaced apart, one side is provided with a die-casting mold apparatus including a coil-type cooler is connected to the cooling water inlet and the other side is connected to the cooling water outlet.

Here, the coil cooler may be formed inside the core forming the hollow portion of the product.

In addition, a plurality of heating lines are formed in the upper mold and the lower mold, the cooling water outlet is connected to one side of the heating line, the cooling water is recycled.

In addition, the upper one side of the upper mold is provided with a runner cutter for cutting the ball runner, it is possible to move back and forth by a drive cylinder installed at the rear.

In addition, a spout is provided on the upper side of the upper mold.

In addition, the lower one side of the cavity is connected to the vacuum pump through the vacuum pipe, between the cavity and the vacuum pipe, the chill vent is formed with a flow path having at least one bent portion to discharge the bubbles generated in the cavity to the outside do.

According to the die casting mold apparatus according to an embodiment of the present invention, the chill vent is provided on one side of the lower portion of the cavity, while the mouth is provided on the upper side of the mold, there is no need to apply a high pressure during the injection of the molten metal, and thus the installation space and installation cost This is reduced.

In addition, a coil-shaped cooler is provided inside the mold for cooling the mold, thereby improving cooling performance, and cooling water passing through the cooler is introduced into the heating line again and recycled in the mold, thereby improving cooling efficiency.

In addition, one side of the upper mold is provided with a runner cutter, the cutting of the runner is made automatically can reduce the cost and time.

Hereinafter, a preferred embodiment of a die casting mold apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

In addition, the following examples are not intended to limit the scope of the present invention but merely illustrative of the components set forth in the claims of the present invention, which are included in the technical spirit throughout the specification of the present invention and constitute the claims Embodiments that include a substitutable component as an equivalent in the element may be included in the scope of the present invention.

1 is a step-by-step state of use of the die casting mold apparatus according to the prior art, Figure 2 is a front sectional view of the die casting mold apparatus according to an embodiment of the present invention, Figure 3 is a plan view of an upper mold according to an embodiment of the present invention, Figure 4 is a plan view of a lower mold according to an embodiment of the present invention, Figure 5 is a side cross-sectional view of the die casting mold apparatus according to an embodiment of the present invention, Figure 6 is completed by the die casting mold apparatus of Figures 1 to 4 It is a perspective view which shows the example of a mold.

Example

2 to 5, the die casting mold apparatus 100 according to the exemplary embodiment of the present invention supports the upper mold 210 and the upper mold 210 at the lower portion of the upper mold 210. A lower mold 220 and a cooler 240 in which cooling water flows are included, and the upper mold 210 and the lower mold 220 are collectively referred to as a mold 200.

Here, the upper mold 210 and the lower mold 220 are formed with cavities (211, 221) so as to correspond to the shape of the product (M) to be cast during molding, the upper mold 210 is the upper holder 300 And, the lower mold 220 is supported by the lower holder 400, the lower side of the lower holder 400, a plurality of eject pins 510 to take out the product (M) from the mold 200 There is provided an ejectable plate 500 is provided.

On the other hand, the eject plate 500 is provided with a plurality of lower guide pins 520 for guiding the coupling direction with the lower holder 400, for guiding the combined direction of the upper mold 210 and the lower mold 220 A plurality of guide bars 212 and 222 are provided in the upper mold 210 and the lower mold 220, respectively.

Here, a cooler 240 is provided in the mold 200 to surround the cavities 211 and 221 in order to improve the cooling efficiency of the melt filled in the cavities 211 and 221. The cooler 240 is formed in a coil shape in which the coolant flows. In the case of casting the product M having the hollow part, it is preferable to be symmetrical about the axis of the core 230 inside the core 230 forming the hollow part of the product M, as shown in FIG. 1. It is preferable that it is formed in a coil shape.

Cooling water inlet 241 is connected to one side of the cooler 240 and the cooling water outlet 242 is connected to the other side, the coolant injected through the coolant inlet 241 passes through the cooler 240 to the cavity (211,221) When the filled molten metal and the mold 200 are cooled and discharged through the cooling water outlet 242, the temperature is increased by the heat transferred from the molten metal. As such, the cooler 240 is formed in a coil shape, thereby cooling the cooler 240. In the process of passing through the cooling water may have a sufficient cooling time compared to the linear shape, it is possible to prevent the mold 200 from being damaged by thermal expansion.

On the other hand, by supplying the pre-cooled cooling water to the heating line 600 formed in the upper mold 210 and the lower mold 220 it is possible to recycle the cooling water in the mold (200).

In this case, a plurality of heating lines 600 are installed in the mold 200 and the holders 300 and 400, and heating lines 600 may be inserted into the heating lines 600 to be electrically heated, and the mold may be heated by flowing hot water. It is also possible to increase or maintain the temperature of the 200, and considering the design conditions of the mold 200 such as the shapes of the cavity 211 and 221 and the cooling rate of the molten metal, the cooling water passing through the cooler 240 is a plurality of heating lines. Which heating line 600 to connect to 600 can be arbitrarily selected by the user.

Meanwhile, as illustrated in FIGS. 3 and 4, a plurality of cooling lines 700 may be installed in the mold 200 and the holders 300 and 400 to surround the cavities 211 and 221, and the outside of the mold 200. Cooling water supplied from the cooling line 700 passes through these cooling lines 700 to cool the molten metal and the mold 200 filled in the cavities 211 and 221.

An upper holder cover 310 covering the upper holder 300 is coupled to an upper side of the upper holder 300, and an upper guide pin 311 provided at one side of the upper holder cover 310 is attached to the upper holder 300. Guide the coupling direction of the upper holder cover 310, the upper side of the upper holder cover 310 is provided with a spout 320 connected to the cavity 211 of the upper mold 210 by the tang runner 321 do.

Accordingly, the molten metal injected into the cavity 211 of the upper mold 210 through the spout 320 flows downward downward naturally by gravity, filling the cavity 221 of the lower mold 220 first, and then the upper mold. Filling the cavity 211 of the 210, and thus can be filled in the cavity (211, 221) of the mold 200 without a separate injection cylinder for pressing the molten metal as in the conventional embodiment shown in FIG.

At this time, in order to prevent the occurrence of bubbles, the tanggu 320 is formed to be spaced apart from the central axis of the cavity (211,221) by a predetermined distance flows a predetermined distance in the horizontal direction along the tanggu runner 321 is injected into the tanggu 320 After that, it is preferable to flow in the downward direction and injected into the cavities 211 and 221. The molten metal solidified in the tap runner 321 is cut by the runner cutter 800 described later.

One side of the upper holder 300 is provided with a runner cutter 800 to cut the solid melt in the above-described hot runner 321, the runner cutter 800 is the rear of the runner cutter 800, that is, the upper holder ( It is coupled to the front end of the drive cylinder 810 installed on the outside of the 300, and is moved back and forth by the operation of the drive cylinder 810 to cut the solid molten metal to the runner runner 321.

In this case, the driving cylinder 810 may be automatically controlled by a temperature sensor (not shown) or a timer (not shown) installed on one side of the mold 200.

On the other hand, the gas (gas) generated during the melt filling process during die casting is inevitable, and the residual bubbles generated in the molten state remain in the product (M) in a void state to reduce the quality of the product (M). In order to solve this problem, it is necessary to forcibly suck the bubble to the outside of the mold 200 by using a vacuum device, the die casting mold apparatus 100 according to an embodiment of the present invention is the upper holder 300 and Chill vents 900 are provided outside the joining surface of the lower holder 400, and a plurality of vacuum pipes 940 connected to one side of the chill vents 900 are provided in the lower mold 220. Connected from), the other side of the chill vent 900 is provided with a vacuum pump (not shown).

Therefore, bubbles in the cavities 211 and 221 flow into the chill vent 900 together with the molten metal and are discharged to the outside of the mold 200 during the operation of the vacuum pump.

Here, the chill vent 900 includes an upper chill vent 910 provided at one side of the upper holder 300 and a lower chill vent 920 provided at one side of the lower holder 400 to correspond to the upper chill vent 910. And the upper chill vent 910 and the lower chill vent 920 are in contact with each other to form a flow path 930 having a plurality of bent portions. As a result, the molten metal flowing into the flow path 930 is rapidly formed. Cooling and increasing the viscosity of the melt and consequently the flow of the melt is stopped to prevent the melt from scattering.

At this time, the plurality of vacuum pipes 940 connected to the cavity 221 is preferably connected at equal intervals along the circumference of the cavity 221, the recessed portion 941 is concave at the tip of the vacuum pipe 940 In the process of forming a molten metal from the cavity 221 to the recessed portion 941, it is preferable to allow impurities mixed in the molten metal to remain in the recessed portion 941.

In addition, the length of the vacuum pipe 940 is preferably secured sufficiently so that the melt flowing along the vacuum pipe 940 toward the chill vent 900 can be sufficiently cooled. Thus, as shown in FIG. When the distance between the 941 and the chill vent 900 is short, it is preferable that a plurality of bent portions are formed in the vacuum pipe 940 so that the overall length becomes long.

Meanwhile, those skilled in the art may form the chill vent 900 integrally without being divided into the upper chill vent 910 and the lower chill vent 920, and the upper chill vent 910 may also be formed. It is also possible to combine the lower chill vent 920 first and then to the upper mold 210 or the lower mold 220.

Operation of the die casting mold apparatus 100 according to an embodiment of the present invention is as follows.

The lower holder 400 is coupled to the lower guide pin 520 provided on the eject plate 500, the lower mold 220 is coupled to the lower holder 400, and the upper portion is provided on the upper holder cover 310. The upper holder 300 is coupled along the guide pin 311, and the upper mold 210 is coupled to the upper holder 300.

Thereafter, when the upper mold 210 and the lower mold 220 are combined along the guide bars 212 and 222, as illustrated in FIGS. 1 and 5, the molded product 200 is to be cast (M). Cavities 211 and 221 are formed in the shape of.

At this time, one side of the upper holder cover 310 is installed a driving cylinder 810 coupled to the runner cutter 800 at the tip, one side of the upper mold 210 and the lower mold 220, that is, the upper holder ( A chill vent 900 is interposed between the 300 and the lower holder 400, and a vacuum pump is connected to the chill vent 900.

In addition, a coil cooler 240 in which cooling water flows is installed in the middle 230 of the lower mold 220, and a plurality of heating lines 600 and cooling lines are provided in the upper mold 210 and the lower mold 220. 700 is provided.

Thereafter, the molten metal is injected into the pouring holes 320 provided on the upper holder cover 310 to fill the cavities 211 and 221. In this case, the injection of the molten metal may also be performed by gravity, and the molten metal may be injected by an operation of an injection cylinder (not shown) having a piston (not shown) that connects a sleeve (not shown) to the molten metal and moves up and down within the sleeve. It is possible.

The molten metal injected into the cavities 211 and 221 first fills the cavity 221 of the lower mold. The molten metal flows to the chill vent 900 along the vacuum pipe 940 by the operation of the vacuum pump. In this process, impurities in the molten metal remain in the recess 941 formed at the tip of the vacuum pipe 940, and bubbles are discharged to the outside of the mold 200 through the chill vent 900, and the chill vent 900. The molten metal flowing along the flow path 930 is stopped while increasing in viscosity while rapidly cooling.

On the other hand, in the filling and solidification process of the molten metal injected into the cavity (211,221) by the heating wire or preheated hot water or oil (oil), by supplying heat to the mold 200 along the heating line 600 inside the cavity (211,221) By reducing the temperature difference of the product can prevent the occurrence of defects, the cooling of the mold 200 and the molten metal is made by a fluid such as cooling water flowing along the cooling line (700).

At this time, the molten metal filled in the cavities (211, 221) by the coil-shaped cooler 240 installed inside the core 230 can be cooled for a sufficient time to improve the cooling efficiency, preheating while passing through the cooler 240 By inducing the cooled water back to the heating line 600, it is possible to improve the productivity by recycling the cooling water in the mold 200.

When the product is completely solidified, the driving cylinder 810 is operated to cut the runner runner 321, the runner cutter 321, after the release of the upper mold 210 and the lower mold 220, the eject plate 500 Eject pin 510 is raised together with the product is taken out from the mold (200).

It will be apparent to those skilled in the art that the above-described steps such as incorporation, molten metal injection and coagulation, mold release, and product extraction can be automatically performed by an automated device, for example, a temperature sensor installed at one side of a mold. Alternatively, each step may be performed sequentially by a timer.

At this time, the amount of heat supplied to the heating line and the cooling line for controlling the temperature of the mold can of course be adjusted.

1 is a step-by-step state of use of the die casting mold apparatus according to the prior art.

Figure 2 is a front sectional view of the die casting mold apparatus according to an embodiment of the present invention.

3 is a plan view of the upper mold according to an embodiment of the present invention.

4 is a plan view of a lower mold according to an embodiment of the present invention.

Figure 5 is a side cross-sectional view of the die casting mold apparatus according to an embodiment of the present invention.

6 is a perspective view showing an example of a mold completed by the die casting mold apparatus of FIGS. 1 to 4;

Explanation of symbols on the main parts of the drawings

100: die casting mold apparatus 200: mold

210: upper mold 220: lower mold

230: middle 240: cooler

300: upper holder 310: upper holder cover

320: tanggu 321: tanggurunner

400: lower holder 500: eject plate

510: eject pin 600: heating line

700: cooling line 800: runner cutter

810: driving cylinder 900: chill vent

930: flow path 940: vacuum piping

Claims (7)

In die casting mold apparatus, An upper mold having a cavity corresponding to the product shape; A lower mold which opposes the upper mold and forms a cavity corresponding to the product shape; And And a coil type cooler formed in a coil shape spaced apart from the cavity by a predetermined distance, and having a cooling water inlet connected to one side thereof and a cooling water outlet connected to the other side thereof. The method of claim 1, wherein the coil cooler, Die casting mold apparatus, characterized in that formed in the core to form a hollow portion of the product. The method according to claim 1 or 2, A plurality of heating lines are formed in the upper mold and the lower mold, the cooling water outlet is connected to one side of the heating line, die casting mold apparatus characterized in that the cooling water is recycled. The method according to claim 1 or 2, Die casting mold apparatus, characterized in that the upper one side of the upper mold is provided with a runner cutter for cutting the ball runner. The method according to claim 4, wherein the runner cutter, Die-casting die device, characterized in that the movable back and forth by a drive cylinder installed in the rear. The method according to claim 1 or 2, Die casting mold apparatus characterized in that the mouth is provided on the upper side of the upper mold. The method according to claim 1 or 2, The lower one side of the cavity is connected to the vacuum pump through a vacuum pipe, between the cavity and the vacuum pipe, the chill vent formed with a flow path having at least one bent portion to discharge the bubbles generated in the cavity to the outside Die casting mold apparatus characterized in that the provided.

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