KR100361477B1 - Thermal Control System of Mold - Google Patents

Abstract

The present invention is to maintain the temperature of the plastic injection molding mold by supplying a cold and hot fluid to maintain the temperature of the molded product to improve the appearance of the molded product, and to easily remove the residual fluid remaining in the mold or system as needed. The temperature control system of the mold for supplying hot and cold water to the mold (1) to maintain the proper temperature, the fluid supply line (3) having a first fluid solenoid (2) is a pump ( 4, the supply line 5 of the pump 4 comprises an inlet line 8 with a hot water solenoid valve 7 of the heater tank 6 and a drain line 9 of the heater tank 6 Is connected in parallel to, and the drain line 9 of the heater tank 6 is connected to the mold (1), the drain line 10 of the mold (1) is a temperature sensor 12 installed in the semi-mould (11) To the branch point, the fluid drainage line 14 having a second fluid solenoid valve 13 And having a water level sensor (15) is made in a structure that is connected in parallel to each of the auxiliary tank (17) connected to the fluid supply line (3).

Description

Temperature Control System of Mold {Thermal Control System of Mold}

The present invention relates to a mold temperature control system for controlling the temperature of a synthetic resin mold, and more specifically, to perform a more precise temperature control of the mold during the injection molding operation to improve the quality of the injection molded product, if necessary, for example The present invention relates to a mold temperature control system that removes residual fluid in a mold or removes residual fluid to prevent freezing of the system during the winter season. Must be properly controlled, that is, injection molding is possible without controlling the temperature of the mold, but the temperature of the mold during the injection molding operation is affected because the temperature of the mold significantly affects the appearance, electrical properties, shrinkage or dimensions of the product. According to the characteristics of synthetic resin to be injection molded. Desperation is developing into a trend.

In general, in order to control the mold temperature, the hole for installing the temperature sensor must be processed in the mold, and the hole processing of the mold is considerably difficult. This is a heat treatment of the mold, which is already manufactured. In addition, it costs a lot of processing cost per mold and also installs the temperature sensor in the correct position due to the complicated structure in the mold (for example, mill pin, cooling water passage, etc.) Difficulties were raised.

In addition, the system that controls the temperature control of the mold by fluid has been raised problems such as temperature deviation and electrical energy loss increase even if the sensor is mounted in the mold.

Moreover, the conventional mold temperature control device does not have a separate fluid recovery device for recovering or draining the coolant medium in the system or the mold, if necessary, but also forcibly supplies air to blow out the remaining fluid. It is intended to be removed.

Meanwhile, referring to an example of a conventional mold temperature control device, temperature control is performed by heating and pumping a medium temperature, but such a temperature control method includes a change in working environment, a temperature of cooling water, a structure of a mold cooling line, or a mold cooling passage. Due to the scale of the mold, the difference between the actual temperature of the mold and the temperature of the coolant medium is significantly different on average. This temperature deviation causes many defects in the injection molding of the resin.

In addition, when the mold is replaced or exchanged as needed to produce a variety of products, it is not easy to remove residual water from the coolant fluid, and the pump of the temperature control system is often frozen due to the coolant remaining in the winter. It has a problem.

Therefore, the present invention was invented to solve the conventional problems as described above, while maintaining the temperature of the mold in the case of the synthetic resin injection mold to improve the appearance beauty of the product while improving the quality of the mold during winter freeze protection function The purpose is to provide a temperature control system for the mold which also serves as

1 is an overall circuit diagram of a mold temperature control system according to the present invention,

2 is a circuit diagram when the coolant is directly added,

3 is a circuit diagram using a heater tank,

Figure 4 is a circuit diagram when removing the residual water of the mold,

5 is a circuit diagram when removing residual water of the entire system;

6 is a diagram showing the opening and closing of each of the valves acting according to the invention.

-Explanation of symbols for the main parts of the drawing-

1: mold 2: first fluid solenoid valve

3: fluid supply line 4: pump

5: supply line 6: heater tank

7: hot water solenoid valve 8: inlet line

9: drainage line 10: drainage line

11: semi-mould 12: temperature sensor

13 second fluid solenoid valve 14 fluid drain line

15: level sensor 17: auxiliary tank

18 drain drain line 19 air solenoid valve

20: Air supply line 21a, 21b, 21c: check valve

22: third fluid solenoid valve

As a means for achieving the above object, the configuration of the present invention, the fluid supply line having a first fluid solenoid valve is connected to the pump, the supply line of the pump is connected in parallel to the inlet line and the drain line of the heater tank The drain line of the heater tank is connected to the mold, and the drain line of the mold is connected to the fluid supply line with a fluid drain line having a second fluid solenoid valve and a water level line with a temperature sensor installed at a semi-mold as a branch point. It consists of a structure that is connected in parallel to each of the auxiliary tanks.

A drain drain line is connected to the fluid drain line in the heater tank, and the drain line of the heater tank has a structure in which an air supply line having an air solenoid valve for supplying compressed air is connected.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall circuit system diagram showing a temperature control system of a mold according to an embodiment of the present invention. As shown in FIG. 1, the temperature control system of the mold according to an embodiment of the present invention includes hot water in the mold 1. And a temperature control apparatus of a mold for supplying cold water to maintain a proper temperature, wherein a fluid supply line 3 having a first fluid solenoid 2 is connected to a pump 4, and a supply line of the pump 4 is provided. (5) is connected in parallel with an inlet line (8) having a hot water solenoid valve (7) of the heater tank (6) and a drain line (9) of the heater tank (6), and the drain line of the heater tank (6) (9) is connected to the mold (1), the drain line (10) of the mold (1) has a temperature sensor (12) installed in the semi-mould (11) as a branch point, the second fluid solenoid valve (13) Parallel to the auxiliary tank (17) connected to the fluid supply line (3) with a fluid drain line (14) and a water level sensor (15) Made of structure.

Here, a separate drain drain line 18 having a third fluid solenoid valve 22 is installed in the heater tank 6 and connected to the fluid drain line 14, and the drain line of the heater tank 6 is provided. An air supply line 20 having an air solenoid valve 19 for supplying compressed air to 9 is connected.

In addition, check valves 21a, 21b and 21c for flowing fluid in one direction to the supply line 5 of the pump 4, the drain line 9 of the heater tank 6 and the inlet line of the auxiliary tank 17. Are installed respectively.

Referring to the temperature control action of the mold using the temperature control system of the mold according to the present invention made as described above, first, when the cold water fluid is to be supplied directly into the mold 1 as shown in FIG. It is a system that is directly injected into the mold (1) through a separate cold water fluid line without passing through), which is a delay of the mold cooling time due to the latent heat of the heater tank (6) is the temperature of the cold water fluid supplied to the mold (1) It is used to prevent.

As the first fluid solenoid valve 2 of the fluid supply line 3 is opened, the cold water fluid is supplied to the supply line 5 by the action of the pump 40, where the inlet line 8 of the heater tank 6 is provided. Since the hot water solenoid valve 7 is closed at), the cold water fluid is supplied directly to the mold 1 to lower the temperature of the mold 1.

And the cold water fluid discharged toward the drain line 10 of the mold 1 is introduced into the auxiliary tank 17 while the temperature is sensed by the temperature sensor 12 of the semi-mould 11, wherein the fluid drainage The second fluid solenoid valve 13 of the line 14 is closed.

Subsequently, the cold water fluid introduced into the auxiliary tank 17 is recycled as described above through the pump 4 until the mold 1 is maintained at a constant temperature.

More briefly, the temperature sensor 12 installed in the semi-mould 11 is discharged through the drain line 10 of the mold 1 in order to raise the temperature of the mold 1 and lower it to a constant temperature. The temperature of the fluid is measured to supply the cold water fluid when the temperature of the fluid is high, wherein the flow of cold water fluid is the cold water fluid → pump (4) of the fluid supply line (3) or auxiliary tank (17) → the supply line (5) → mold (1) → mold drain line (10) → auxiliary tank (17) to continuously recycle the cold water fluid to reduce the temperature of the mold (1) to an appropriate level.

In the fluid flow state as described above (see dotted line in FIG. 2), the first fluid solenoid valve 2 is open, but the hot water solenoid valve 7 and the second fluid solenoid valve 13 are closed.

When the temperature of the mold 1 decreases to a predetermined level, the second fluid solenoid valve 13 of the fluid drain line 14 is opened to discharge the cold water fluid discharged from the mold 1 to the outside.

On the other hand, in order to increase the temperature of the mold 1 to a certain level, as shown in FIG. 3, the fluid supplied to the fluid supply line 3 or the auxiliary tank 17 side is supplied to the heater tank through the pump 4 (6), where the fluid is heated in the heater tank (6) and the drain line (9) as the hot water solenoid valve (7) installed in the inlet line (8) of the heater tank (6) is opened. The mold 1 is supplied into the mold 1 to raise the mold 1 to an appropriate temperature.

Here, the hot water fluid passed through the mold is continuously recycled until the temperature is measured by the temperature sensor 12 installed in the semi-mould 11 and the mold is covered with the proper temperature, and the mold 1 is maintained at the proper temperature. When the second fluid solenoid valve 13 of the fluid drain line 14 is opened, the hot water medium is discharged to the outside.

At this time, the flow of the hot water fluid is as follows: auxiliary tank (17) → pump (4) → hot water solenoid valve (7) → heater tank (6) → drain line (9) → mold (1) → temperature sensor (12) → auxiliary tank Recycled to (17) (see FIG. 3).

Here, the temperature of the cold water or hot water fluid discharged from the mold 1 is checked and managed by the temperature sensor 12 mounted on the semi-mould 11, and a separate temperature sensor does not need to be installed in the mold. The temperature deviation of the mold 1 can be reduced.

4 and 5 are for discharging the fluid remaining in the mold 1 and the fluid remaining in the entire system as needed, Figure 4 is to remove the residual fluid of the mold, the first fluid solenoid When the air solenoid valve 19 connected to the drain line 9 is opened while the valve 2 and the hot water solenoid valve 7 are closed, the second fluid solenoid opened through the mold 1 through the compressed air. It is discharged to the fluid drain line 14 through the valve (13).

When the fluid residue in the mold 1 is completely removed in this way, the mold 1 can be replaced with another mold for another injection molding.

5 is for completely removing the cold water or hot water fluid remaining in the temperature control system of the mold according to the present invention, as required by the maintenance and inspection of the winter or the system or winter, such as the first fluid solenoid valve (2) ) And supply the compressed air with the hot water solenoid valve (7) and the second fluid solenoid valve (13) open from the open air solenoid valve (19) side of the air supply line (2). And the remaining fluid remaining inside the system is discharged to the fluid drain line 14 along the dotted line in the figure.

In addition, a third fluid solenoid valve 22 is installed in the drain drain line 18 for the purpose of removing the scale of the heater tank 6 and the respective lines and the mold cooling water passages.

On the other hand, Figure 6 is a diagram showing the open and closed state of each valve when supplying or removing cold water and hot water and residual fluid.

The opening and closing states of the valves shown in this diagram are intended to act simultaneously by known electrical circuits.

In addition, it is found that the mold temperature control system according to the present invention can be applied to any fluid having good preheating and cooling efficiency as well as water.

As described above, the present invention can effectively control the temperature of the mold which directly affects the injection molding of the resin, thereby obtaining a better appearance of high-quality upper mold products, and economically and efficiently controlling the temperature of the mold even during frequent mold changes. However, when the mold is not used in the cold weather such as winter season, it has the advantage of protecting the system from freezing by effectively removing the residual fluid remaining inside the system.

Claims (3)

In the temperature control device of the mold for supplying hot water and cold water to the mold (1) to maintain the proper temperature, A fluid feed line 3 with a first fluid solenoid 2 is connected to the pump 4, the supply line 5 of which is equipped with a hot water solenoid valve 7 of the heater tank 6. It is connected in parallel to the water supply line (8) and the drain line (9) of the heater tank (6), the drain line (9) of the heater tank (6) is connected to the mold (1). The drain line 10 of the mold 1 is a fluid drain line 14 and a water level sensor having a second fluid solenoid valve 13 with a temperature sensor 12 installed at the semi-mould 11 as a branch point. 15) and a temperature control system of the mold, characterized in that each made in parallel to the auxiliary tank (17) connected to the fluid supply line (3). The heater tank (6) is provided with a separate drain drain line (18) having a third fluid solenoid valve (22) and connected to the fluid drain line (14). The temperature control system of the mold, characterized in that the air supply line 20 is provided with an air solenoid valve 19 for supplying compressed air to the drain line (9) of. According to claim 1, wherein the supply line 5 of the pump 4, the drain line 9 of the heater tank 6 and the inlet line of the auxiliary tank 17, the check valve (21a) for flowing the fluid in one direction 21b, 21c) is a temperature control system of the mold, characterized in that made respectively.