KR20170126135A - Temperature control system for molds using cooling and heating device - Google Patents

Abstract

The present invention relates to a mold temperature control system for automatically controlling cold water and hot water, wherein the mold temperature control system is capable of controlling the temperature of a mold according to a product by selectively supplying cooling water through a temperature controller and a chiller or cooling tower circulation water. The mold temperature control system comprises: a temperature controller (10); cooling tower circulation water or a chiller (20); a mold (30) equipped with a first temperature sensor (31); a supply and collection distributor (40, 50); a supply line (60) and a collection line (70) connected between the cooling tower circulation water or chiller (20) and the supply and collection distributor (40, 50); a plurality of supply pipes (80) and collection pipes (90) connected between the mold (30) and the supply and collection distributors (40, 50); and a second temperature sensor (91) installed on the collection pipes (90).

Description

TECHNICAL FIELD [0001] The present invention relates to a mold temperature control system for automatically controlling cold water and hot water,

The present invention relates to a mold temperature control system for automatically controlling cold water and hot water, and more particularly to a mold temperature control system for automatically controlling cold water and hot water, which can selectively control cold water and hot water by simple operation, .

In general injection molds, the temperature of the mold should be adjusted appropriately to improve the product quality. Injection molding can be performed without controlling the temperature of the mold, but the mold has a considerable influence on the appearance, electrical characteristics, shrinkage ratio, dimensions, cycle time, etc. of the product depending on the temperature. ) Or a flow mark or the like.

As a method for improving appearance defects, a method of improving the appearance quality by raising the temperature of the mold is used. The method includes a method of using hot water or hot oil in the cooling line inside the mold, a method of heating by hot air, There have been various attempts such as a method of heating by a high frequency induction heating method, a method of sandwiching a heat plate between the cavity and core of a mold, a method of using a heat insulating effect by coating a super heat resistant polymer resin on the outer surface of a mold, Good results were obtained. However, the higher the mold temperature, the better the appearance, but the longer the cooling time, the lower the production efficiency of the product and the durability and the operability of the mold.

In order to realize the No-Weld product by introducing the rapid heating / cooling method of Japanese in domestic companies, attempts have been made to improve the appearance of the injection molding product by controlling the mold temperature.

This technology is called Rapid Heat Cycle Molding (RHCM). When the mold is heated by using the cooling line designed inside the mold, steam is used. When cooling, the temperature is changed by using the room temperature water or cold water It is a way to control.

The role of the cooling line in conventional molds is to uniformly control the mold temperature to the set temperature. On the other hand, in RHCM, two temperatures of high temperature and low temperature are set. When the plastic resin is injected, it is set to a high temperature state in order to minimize the property of solidifying in contact with the mold wall surface. It is operated in such a way. That is, in the process of filling the resin, the mold temperature is controlled in such a manner that the temperature is set to be equal to or higher than the glass transition temperature (Tg) of the plastic resin, and cooling is performed based on the completion of the product shape.

However, this RHCM processing technology has an advantage that it can improve the production efficiency of the product by rapidly cooling the mold as well as improving the outer surface of the mold. However, at the time of filling the resin, the heating is fixed to the set temperature according to the predetermined resin There is a limitation in that it is inevitably operated that the temperature of the mold is completely lowered by using cooling water and cooling water. In other words, even if injection is performed by a plurality of resins having different transition temperatures for molding one product, it is necessary to heat the mold to a set temperature, cool the mold again after charging, and then heat the mold to a temperature suitable for the other resin , There is a problem in that it is not efficient in terms of mass production for a variety of injection molding products.

In order to solve the above problems, the present invention provides a mold temperature control system for automatically controlling the temperature of a mold according to a product by selectively supplying cooling water through an on-off valve, a chiller and a cooling tower circulating water, .

According to an aspect of the present invention, there is provided a mold temperature control system for automatically controlling cold water and hot water. The system includes a hot water heater, a cooling tower circulating water or chiller, a mold having a first temperature sensor, A supply line and a recovery line connected between the cooling tower circulation water or chiller and the supply and recovery distributor, a plurality of supply pipes and a recovery pipe connected between the mold and the supply and recovery distributor, A hot water supply pipe provided between the on-off valve and the 3-way valve on the return line, and a hot water recovery valve provided between the on-off valve and the 3-way valve on the supply line, Way valve; an actuator installed between the 3-way valve and switching the flow of the cooling water passing through the 3-way valve; and a second temperature sensor of the mold and a second Also it consists as to sense the temperature of the sensor, and the early-on and cooling tower circulation passes the signal to the actuator to the controller to drive the operation of the 3way valve.

Therefore, in the mold temperature control system for automatically controlling the cold water and the hot water, the cooling water is selectively supplied by the 3-way valve and the actuator installed in the supply line and the collecting line, and the circulating water of the chiller and the cooling tower, It is possible to reduce the cost by making the structure compact and to control the temperature of the mold according to the product.

1 is a schematic view showing a mold temperature control system for automatically controlling cold water and hot water according to the present invention;
2 and 3 are schematic views showing the operation of an actuator and a 3-way valve according to the present invention;

The features of the present invention can be understood by the embodiments described below with reference to a mold temperature control system for automatically controlling cold water and hot water according to the present invention.

In the following description of the present invention, a detailed description of components that are widely known and used in the art to which the present invention belongs or does not belong will be omitted, and redundant description thereof will be omitted, To communicate more clearly.

1 to 3, the mold temperature control system for automatically controlling the cold water and the hot water according to the present invention includes an on-off unit 10, a cooling tower circulating water or chiller 20, a mold 30, A supply line 60 and a recovery line 70 connected between the cooling tower circulation water or chiller 20 and the supply and recovery distributor 40 and 50, A plurality of supply pipes 80 and a return pipe 90 connected between the supply and recovery distributors 40 and 50 and a second temperature sensor 91 are installed in the return pipe 90, The hot water supply pipe 110 is installed between the warmer 10 and the 3-way valve 100 on the recovery line 70, A hot water recovery pipe 120 installed between the warmer 10 and the 3-way valve 100 on the supply line 60 and a hot water recovery pipe 120 installed between the 3-way valve 100 and the 3-way valve 100 Of cooling water The first temperature sensor 31 of the mold 30 and the second temperature sensor 91 of the return pipe 90 and the cooling tower circulation And a controller 140 for sensing the temperature of the water and guiding the operation of the 3-way valve 100 by transmitting a signal to the actuator 130.

It is preferable that the temperature controller 10 maintains the temperature of the cooling water at about 80 DEG C and supplies the temperature to the mold 30 side.

The cooling tower circulation water or chiller 20 is supplied with cooling water passing through the mold 30 after injection molding, directly supplied through a cooling tower, or cooled by chiller 20 to approximately 20 ° C.

The actuator 130 may be driven by hydraulic pressure or pneumatic pressure and may be connected to one side of the 3way valve 100 so that the 3way valve 100 installed in the supply line 60 and the recovery line 70 is operated simultaneously .

The first temperature sensor 31 is installed on the side of the mold 30 to transmit the temperature of the mold 30 to the controller 140.

The second temperature sensor 91 is installed in the recovery pipe 90 to detect the temperature of the cooling water that has passed through the mold 30 and transmits the detected temperature to the controller 140.

As described above, according to the present invention, the function and effect of the mold temperature control system for automatically controlling the cold water and the hot water will be described. The cooling water supplied from the cooling tower circulating water or the chiller 20 and the warmer 10, The cooling of the mold 30 proceeds continuously as the injection proceeds from the injection to the cooling of the mold, the opening of the mold, the extraction of the mold, and the mold closing.

The method of supplying cooling water to the mold 30 in this process will now be described. First, the cooling tower circulation water and the cooling water supplied by the chiller 20 are supplied to the operation of the actuator 130 Way valve 100 connected to the hot water supply / return observation on the side of the warm pre-heater 10 is closed and the cooling water flows sequentially through the supply distributor 40 and the supply pipe 80 along the supply line 60 And the cooling water that has passed through the mold 30 is sequentially passed through the recovery pipe 90 and the recovery and dispensing devices 40 and 50 and the recovery line 70, Water or the chiller 20 side.

3, the cooling water supplied from the warmer 10 flows into the cooling tower circulation water or the 3-way valve 100 side of the chiller 20 by the operation of the actuator 130, The cooling water is sequentially transferred through the hot water supply pipe 110 to the supply line 60, the supply distributor 40 and the supply pipe 80 via the 3way valve 100 and supplied to the mold 30 side And the cooling water having passed through the mold 30 passes through the return pipe 90, the collecting distributor 50 and the collecting line 70 in order and passes through the 3-way valve 100 to the hot water collecting pipe 120, And is recovered to the early stage 10 which has come along.

The cooling water circulated in the cooling tower or the cooling water in the chiller 20 and the warmer 10 senses the temperature passed by the temperature sensor installed in the recovery pipe 90 and transmits the sensed temperature to the control unit 140, The controller 140 selectively controls the cooling tower circulation water or the chiller 20 and the warmer 10 to appropriately adjust the temperature of the cooling water supplied to the mold 30 to reduce the cycle time and minimize the defect rate of the product You can do it.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Various modifications may be made by those skilled in the art.

10: On early 20: Cooling tower circulating water or chiller
30: mold 100: 3way valve
120: Actuator

Claims (1)

A heating unit 10, a cooling tower circulating water or chiller 20, a mold 30 provided with a first temperature sensor 31,
A supply and recovery distributor 40, 50,
A supply line 60 and a recovery line 70 connected between the cooling tower circulation water or chiller 20 and the supply and recovery distributor 40, 50,
A plurality of supply pipes (80) and a return pipe (90) connected between the mold (30) and the supply and recovery distributor (40, 50)
A second temperature sensor 91 is installed in the return pipe 90,
The 3-way valve 100 is installed in the supply line 60 and the recovery line 70,
A hot water supply pipe 110 provided between the warm pre-heater 10 and the 3-way valve 100 on the recovery line 70 and a hot water supply pipe 110 installed between the warm pre-heater 10 and the 3-way valve 100 on the supply line 60. [ A hot water recovery pipe 120,
An actuator 130 installed between the 3-way valves 100 for switching the flow of the cooling water passing through the 3-way valve 100,
The temperature of the cooling water passing through the first temperature sensor 31 of the mold 30 and the second temperature sensor 91 of the return pipe 90 is sensed and the 3way And a control unit (140) for guiding the cooling water in the cooling tower circulation water or the chiller (20) side to be selectively supplied by the open / close operation of the valve (100) The mold temperature control system automatically adjusts the temperature.

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