KR101426002B1 - Temperature control System of multi channel mold for reduction cooling cycle time - Google Patents

Abstract

The present invention can detect the temperature and flow rate of the cooling water supplied / passed through the mold and individually control the flow rate of the cooling water supplied to the mold in proportion to the temperature and flow rate of the cooling water, thereby enabling the uniform and partial cooling of the injection mold in the cooling step, To a multichannel mold temperature controller capable of reducing the overall cycle time.

Description

TECHNICAL FIELD [0001] The present invention relates to a multi-channel mold temperature control system for reducing cooling and cycle time,

More particularly, the present invention relates to a mold temperature control apparatus, and more particularly, to a method and apparatus for controlling a mold temperature by controlling the temperature and flow rate of cooling water passing through a mold and individually controlling the flow of cooling water supplied to the mold, The present invention relates to a multichannel mold temperature control apparatus capable of reducing the time required for manufacturing an injection molded product and cooling the mold.

Generally, in a mold for injection molding of a synthetic resin, it is necessary to accurately control the temperature of the mold by using an on-off machine and a cooler in order to improve the quality of the product to be molded, and the accurate temperature control of the mold affects the appearance, shrinkage and dimensions of the product Therefore, it is possible to reduce the defective rate of the product and to shorten the cooling time, thereby improving the productivity, in accordance with the characteristics of the injection-molded product for molding the temperature of the mold during the injection molding operation.

Typical injection molding methods consist of an injection step, a holding step, a cooling step, a mold step, a metering step, a take-out step and a mold-closing step.

The cooling step, which is an important part of the injection molding, is performed by a cooling step in which cooling water, which is cold water at a predetermined temperature, is circulated into the mold to cool the mold as the temperature of the mold is raised by the molten resin injected into the mold, The mold is cooled by the heat conduction of the mold when the temperature of the mold is lowered. 6, it is known that the cooling of the mold is continuously performed in the interval between the pressure holding step and the mold opening step in the control of the injection molding machine, but the cooling of the mold by the cooling water is substantially performed by injection, Weighing, cooling, mold opening, taking out, and continuous mold closing. In this way, even after the air layer between the mold and the molding is enlarged by the cooling water in the whole cycle section, the cooling temperature continues to be cooled by the cooling water, so that the temperature of the mold is lowered more than necessary. In order to perform injection molding in the next cycle, Since the molding can not be performed in a state in which it is more than necessary, the temperature of the molten resin can be raised to allow the resin to flow smoothly in the mold, or the temperature of the cooling water can be raised by using a warmer or the like, It is necessary to increase the temperature to an appropriate temperature, so that the whole cycle is long.

If the temperature of the mold for each physical property of the plastic resin falls below the required level, the physical properties or flow of the molten resin injected into the cavity deteriorates. In a portion where the thickness of the molded article in the cavity is thin, the molten resin is not properly supplied. There has been a problem that a weld is generated.

The temperature regulator constituting the conventional temperature regulating device is a regulator for regulating the temperature of the compressed air having the compressed air solenoid valve in the refrigerant intake line equipped with the intake solenoid valve The line is connected and connected to an auxiliary tank with a level sensor. The supply line of the auxiliary tank is connected to the pump in parallel with another supply line of the heater tank and the outlet line of the pump is connected to the mold while the return line of the mold is connected to the heater tank, Is connected to the drain line. A temperature sensor and a check valve are provided on the return line of the mold, a drain line having a solenoid valve is connected to the heater tank, and a temperature sensor is disposed in front of the inlet solenoid valve of the inlet line. In order to lower the temperature of the mold to a predetermined set temperature, the intake solenoid valve of the refrigerant intake line is opened and a coolant (general 'cooling water') is used as a mold through the pump At this time, the flow of the refrigerant flows from the auxiliary tank → the supply line → the pump → the mold → the return line → the refrigerant drain line, and the temperature of the mold is lowered to the set temperature. At this time, the intake solenoid valve and the drain solenoid valve are opened, and the remaining drain solenoid valve, check valve, and compressed air solenoid valve are closed. In order to supply the hot water of the heater tank to the mold in order to raise the temperature of the mold to the set temperature, hot water is supplied along the heater tank → connection supply line → pump → mold → return line → check valve. At this time, only the check valve is opened, and the remaining intake solenoid valve, drain solenoid valve, drain solenoid valve and compressed air solenoid valve are all closed, and cold water and hot water are removed to prevent frost in winter or maintenance and inspection of the mold apparatus Removal of residual water for the purpose of removing residual water is performed by a compressed air line → auxiliary tank → connection supply line → heater tank → drain line; Compressed air line → auxiliary tank → supply line → pump → mold → return line → discharge the water along the drain line. Here, when the mold is cooled during the winter season, when the coolant of low temperature is taken into the auxiliary tank and immediately introduced into the mold, a sudden cooling action occurs and the control becomes impossible. Therefore, when the temperature of the mold rises above the set value, the intake solenoid valve and the drain solenoid valve are opened so that the cold water is supplied to the auxiliary tank, and the refrigerant is sucked and discharged simultaneously through the supply lines through the supply lines Thereby cooling the mold. That is, by sucking and mixing the cold water and the hot water at the same time, it is possible to prevent the temperature of the mold from dropping sharply even if the coolant temperature in the winter season is low. However, in such a conventional temperature control apparatus, only one exit line and a return line are connected between the temperature controller and the mold, so that the temperature of the mold is controlled to be kept constant at only one temperature. There is a problem that the quality of an injection molded product having various complicated structures and shapes can not be satisfied or optimized and the production time is delayed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a mold temperature control apparatus according to a first embodiment of the present invention; FIG. A plurality of supply refrigerant lines branched and connected to each other between the supply distributor and the mold; A plurality of exhaust refrigerant lines branched and connected to each of the supply refrigerant lines so as to have different flow paths to the metal mold; An outlet distributor in which the discharge refrigerant lines are branched and connected to have different flow paths, and the return line of the temperature regulator is connected; Heating means installed on the plurality of supply refrigerant lines to adjust the refrigerant to different temperatures; The valve means on the supply refrigerant line is constituted by a solenoid valve. In this way, in the conventional temperature control device of the mold, the refrigerant discharged to the outlet line by the operation of the temperature controller is supplied to the supply distributor at a temperature lower than the set minimum temperature of the mold, and the supplied refrigerant is again supplied through the branched distributor And is supplied onto each of the supplied refrigerant lines. At this time, the heater as the heating means on each supply refrigerant line is preheated by the control unit, and heats the refrigerant flowing into the mold through the supply refrigerant line. The solenoid valve on the discharge refrigerant line is closed by the control unit, and the refrigerant flowing through the supply refrigerant line remains on the mold and each supply and exhaust refrigerant line. Thereafter, when the pressures before and after the check valve become the same, the check valve is closed to cut off the supply of the refrigerant onto the supply refrigerant line, and the refrigerant remaining between the check valve and the solenoid valve and the refrigerant remaining in the form of the gold is continuously heated The respective set temperatures are reached. In order to supply the coolant to the mold, the coolant is circulated between the check valve and the solenoid valve by heating the coolant to a predetermined temperature by the heater, and during the time when the coolant is heated by the heater, The mold temperature is increased due to stagnation in the mold. At this time, there is a problem that the scale generation speed is rapidly progressed.

In order to solve these problems, the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for detecting the temperature and flow rate of cooling water passing through a mold, individually controlling the flow rate of cooling water supplied to the mold, And a multichannel mold temperature control device capable of reducing the overall cycle time of the injection molding.

Further, the present invention provides another multichannel mold temperature control device which can shorten the installation and assembly time by making a single block of the distributor, the temperature sensor, the flow rate and the automatic valve, as well as facilitating the replacement and repair work.

According to an aspect of the present invention, there is provided a multichannel mold temperature adjusting apparatus comprising: first and second molds; A body provided with a plurality of inlet lines and a plurality of collection lines connected to the first and second molds in the longitudinal direction for supplying / recovering the cooling water to the first and second molds, A distributor comprising a fixing bolt and a nut; A valve body integrally formed on an inflow line side of the distributor; and an operation valve installed in the distributor and operable to guide opening and closing of cooling water passing through the valve body; A flow sensor installed on the inflow line side of the distributor for sensing a flow rate of the cooling water passing through the automatic valve; A temperature sensor installed at a side of the recovery line of the distributor and sensing the temperature of the cooling water passing through the first and second molds; The flow sensor 100 senses the flow rate of the cooling water supplied to the first and second molds 10 and 11 and the temperature of the cooling water that passes through the first and second molds and is returned to the distributor is detected by the temperature sensor And controls the flow rate of the cooling water by controlling the opening and closing of the automatic valve, thereby controlling the interval of the air injecting device.

The dispenser 20 of the present invention includes a body 21 having an inlet line 22 and a collecting line 24 formed thereon and an inlet port 22 disposed on the front surface of the body 21, And an inlet and outlet brackets 26 and 27 connected to the front and rear surfaces of the body 21. The inlet and outlet brackets 26 and 27 communicate with the inlet and outlet brackets 26 and 27, And a fixing bolt 29 and a nut 30 for fixing the blocking plate 28 to each other.

Accordingly, the multichannel mold temperature controller of the present invention senses the temperature and flow rate of the cooling water supplied / passed through the mold, and individually controls the flow rate of the cooling water supplied to the mold in proportion thereto to uniformly and partially cool the injection mold And the overall cycle time of the injection-molded product can be reduced.

In addition, the present invention has another effect of facilitating installation, replacement, and repair work by forming a block so that a temperature sensor, a flow rate, and an automatic valve are separately installed in the distributor and the distributor.

1 is a schematic diagram of a multi-channel mold temperature control apparatus according to the present invention,
FIG. 2 is an exploded perspective view showing a distributor of the multichannel mold temperature control apparatus according to the present invention,
3 and 4 are cross-sectional views illustrating a distributor according to the present invention,
5 is a schematic view showing a mold and a molded product according to the present invention,
FIG. 6 is a graph comparing the cooling cycle time of the multichannel mold temperature control method and the mold temperature control system according to the present invention.
FIG. 7 is a graph showing a result of a cooling test according to whether a multi-channel mold temperature control method and apparatus for shortening the cooling cycle time according to the present invention are applied.
8 is a photograph showing a comparison between the method of adjusting the temperature of the multichannel mold according to the present invention and the molded article taken out by the apparatus.

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

As shown in FIGS. 1 to 4, the multi-channel mold temperature control apparatus for shortening the cooling cycle time according to the present invention includes first and second molds 10 and 11, The flow sensor 100 and the temperature sensor 110 installed in the distributor 20 and the automatic valve 90 formed integrally with the distributor 20 are installed in the distributor 20, (40, 50) are provided between the first and second molds (10, 11) and the distributor (20), and a storage tank (60) A supply pipe 70 and a return pipe 80 are provided between the storage tank 60 and the distributor 20 and the temperature sensor 110 senses the temperature of the cooling water recovered by the distributor 20, And a control unit 180 for controlling opening and closing of the valve 90 to control the flow rate of the cooling water.

The first and second dies (10, 11) are provided with cooling lines (12) so that the inlet side and the discharge side communicate with each other, and the cooling water is circulated.

The distributor 20 includes a body 21 connected in the longitudinal direction, inlet / outlet brackets 26 and 27 installed on the front surface of the body 21, and blocking plates 26 and 27 installed on the rear surface of the body 21, 28 and fixing bolts 29 and nuts 30 for fixing the inlet / outlet brackets 26, 27, the body 21, and the blocking plate 28 to each other.

The body 21 is provided with a plurality of inflow lines 22 and a plurality of collection lines 24 for supplying / recovering cooling water to the first and second molds 10 and 11, .

An insertion hole (23) is formed to communicate with the inflow line (22), and an insertion hole (25) is formed to communicate with the recovery line (24).

A plurality of engagement holes 32 are formed on the inlet / outlet brackets 26, 27 and the blocking plate 28 in the same line.

The inlet / outlet brackets 26 and 27 are formed to protrude from the connection pipe 33 so as to be connected to the supply pipe 70 and the return pipe 80 side.

The blocking plate 28 is installed behind the body 21 to block one side of the inflow line 22 and the recovery line 24.

The fixing bolts 29 are first inserted into the coupling holes 32 of the inlet / outlet brackets 26 and 27 and the coupling holes 31 of the body 21, respectively, 32 and fastened and fixed by the nut 30.

The plurality of bodies 21 are coupled and fixed in the longitudinal direction by the fixing bolts 29 and the nuts 30.

The automatic valve 90 includes a valve body 91 and an actuating part 92 installed in the distributor 20 for guiding the opening and closing of the cooling water passing through the valve body 91. 90) is a typical structure and is not described in detail)

The valve body 91 is integrally formed with the inflow line 22 of the distributor 20 so that an upper portion of the valve body 91 is openable and closable by the actuating portion 92.

Since the valve body 91 is integrally formed on the upper portion of the distributor 20 so that only the operating portion 92 of the automatic valve 90 is fastened to the distributor 20 and the valve body 91, Work is easy.

The conventional automatic valve 90 is used as an automatic valve 90 by separately producing a valve body 91 as a casting and connecting an actuating part 92 to the valve body 91. However, the present invention can reduce the cost of the automatic valve (90) by manufacturing the valve body (91) integrally with the distributor (20).

The flow sensor 100 is installed in the fitting hole 23 of the inflow line 22 and senses the flow rate of the cooling water passing through the automatic valve 90 and transmits the signal to the controller 180.

The temperature sensor 110 is installed in the insertion hole 25 of the recovery line 24 and senses the temperature of the cooling water passing through the first and second molds 10 and 11 to transmit a signal to the controller 180 do.

An air injection device 120, an electric motor valve 130, a pressure gauge 140, and a temperature gauge 150 are installed in the supply pipe 70.

The electric motor valve 130 is a typical structure and is not described in detail. When the mold is separated from the first and second molds 10 and 11, the electric motor valve 130 is closed At the time when the plasticized material is filled in the cavities of the first and second molds 10 and 11 and injection of the molding is completed, the electric motor valve 130 is opened and cooling water is supplied Cooling of the first and second molds 10 and 11 can be selectively performed.

The air injector 120 is installed on the side of the supply pipe 70 and is connected to the distributor 20, the temperature sensor 110, the flow rate sensor 100, The scale generation in the first and second molds 10 and 11 is suppressed and the residual water in the first and second molds 10 and 11 is removed.

The pressure gauge 140 senses the pressure of the cooling water supplied from the storage tank 60 and transmits a signal to the controller 180.

The temperature gauge 150 senses the temperature of the cooling water supplied from the storage tank 60 and transmits a signal to the controller 180.

The storage tank 60 is filled with a certain amount of cooling water so as to be capable of supplying cooling water. The cooling water contains a large amount of components to be scaled, and a pump (not shown) is installed inside or on the inlet side.

A temperature controller and a chiller may be selectively installed to communicate with the supply pipe 70 and the return pipe 80 provided between the storage tank 60 and the distributor 20.

The control unit 180 controls the air injector 120, the electric motor valve 130, the pressure gauge 140, the temperature gauge 150 and the like and controls the temperature of the temperature sensor 110 and the flow rate of the flow sensor 100 And controls the flow rate of the cooling water according to the sensed condition of the temperature sensor 110 and the flow rate sensor 100 according to the opening and closing of the automatic valve 90 You can. The controller 180 can individually adjust the temperature of the cooling water passing through the first and second molds 10 and 11 and selectively apply the cooling water according to the cooling condition of the mold.

The control unit 180 closes the electric motor valve 130 and sends a signal to the air injection unit 120 so that the compressed air passes through the supply pipe 70 by the air injection unit 120 The cooling water remaining in the cooling line 12 of the first and second dies 10 and 11 is recovered via the distributor 20 or the foreign substances in the first and second dies 10 and 11 are removed, Thereby suppressing the generation.

In addition, regardless of the operation of the control unit 180, the air injection unit 120 may be set separately, and the compressed air may be injected by controlling the timer according to the period and time.

As described above, according to the present invention, the function and effect of the mold temperature control device will be described. After the cavity of the first and second molds 10 and 11 is filled with molten resin, As the molding cycle → the mold separation → the mold closing mold cycle proceeds, the pulses of the first and second molds 10 and 11 are cooled only in a part of the cooling step. More specifically, when the first and second molds 10 and 11 are completely injected and filled with resin, they are raised to a predetermined temperature, and the molded products are sequentially molded according to the shape, The cooling water is supplied from the control unit 180 to the inflow line 22 side of the distributor 20 through the supply pipe 70 so that the cooling water is automatically supplied to the first and second molds 10 and 11. [ The cooling water that has passed through the automatic valve 90 passes through the supply connection portion 40 through the flow sensor 100 provided in the distributor 20 and flows into the mold 10 and 11 are cooled. The cooling water that has passed through the molds 10 and 11 passes through the recovery connection unit 50 and the temperature sensor 110 installed in the distributor 20 in order to be stored along the recovery pipe 80 connected to the distributor 20 And is returned to the tank 60.

If the temperature of the cooling water is sensed by the temperature sensor 110 installed in the distributor 20, the control unit 180 processes the data by the electronic control method and transmits the data to the distributor 20 from the controller 180. [ The automatic valve 90 is opened and closed individually to achieve uniform cooling with little temperature variation of the molding. In other words, the flow rate of the cooling water is individually circulated by the automatic valve 90 according to the injection molding, so that the molding can be uniformly cooled by the flow rate control, and the temperature of the product and the mold A part of the automatic valve 90 is shut off according to the deviation, so that partial cooling is possible.

The controller 180 controls the temperature of the cooling water passing through the first and second molds 10 and 11 by receiving feedback signals from the temperature sensor 110 and the flow rate sensor 100, It is possible to minimize the defective ratio of the injection-molded article by cooling the molded article in an optimal state.

In the present invention, a single block is provided so that the temperature sensor 110, the flow rate sensor 100, and the automatic valve 90 are installed in the distributor 20 and the distributor 20 to facilitate installation, There are advantages.

At the time when the first and second molds 10 and 11 are replaced or the molding is completed, the control unit 180 selectively sends a signal to the air injecting apparatus 120, The compressed air having the pressure wave and the cooling water are sequentially supplied through the supply pipe 70, the distributor 20 and the first and second molds 10 and 11 and then the distributor 20, the return pipe 80, , And the storage tank (60). In this way, scale components can be removed in the pipe through which the compressed air and the cooling water are circulated, and the cooling water remaining in the first and second molds 10 and 11 can be forcibly recovered.

5 to 8, in the injection molding method of the present invention, the molten resin is injected into the first and second molds 10 and 11 maintained at the proper temperature to form the first and second molds 10 and 11 A supply of the cooling water is started by the operation of the automatic valve 90 after the holding step, and the supply of the cooling water is started by the operation of the automatic valve 90 after the holding step, The first and second molds 10 and 11 are separated from each other after the cooling step in which the cooling of the molds 10 and 11 is performed only in a certain section and the cooling step is not performed for a predetermined time, A mold opening step; A take-out step of separating the molded article from the first and second molds 10 and 11, and a mold-closing step of closing and returning the first and second open molds when the molded article is taken out.

In the present invention, the cooling step of the multichannel mold temperature control method will be described. In the cooling step, the temperature of the molds 10 and 11 is controlled by the heat of the molten resin injected into the molds 10 and 11 The cooling water is circulated into the molds 10 and 11 to cool the molds 10 and 11. When the temperature of the molds 10 and 11 is lowered, And 11 are cooled by the heat conduction of the molds. In this process, cooling of the cooling water is performed discontinuously in only a part of the cooling step after the pressure holding step.

The cooling water having a predetermined pressure is introduced into the distributor 20 and the respective automatic valves 90 connected to the distributor 20 are opened at the same time The cooling water is supplied to the cooling line 12 side of the first and second molds 10 and 11. The temperature sensor 110 senses the temperature of the cooling water that has passed through the cooling line 12, The automatic valve 90 individually blocks the supply of the cooling water passing through the cooling line 12 according to the thickness of the molded product in the control unit 180 by feedback-controlling the cooling water temperature of each cooling line. However, if the thickness of the molding is not constant, even if the cooling is performed uniformly, since the amount of heat of the molten resin in the thinned portion (a) is small, the amount of heat emitted is relatively small . That is, the amount of heat released by each part of the molded article depends on the cooling efficiency of the part and the total heat amount of the molten resin. As described above, according to the present invention, when the control unit 180 receives the signal of the temperature sensor 110 and individually blocks the flow of the cooling water supplied to the first and second molds 10 and 11 by the automatic valve 90 As shown in FIGS. 5 and 8, when the thinned portion (a) of the molded product is rapidly cooled and the flow of cooling water on the cooling line 12 side is blocked by the automatic valve 90 to reduce the flow rate, The cooling water supply pressure on the side of the distributor 20 is increased and the flow rate of the cooling water in the other cooling line 12 is increased and the Reynolds Number is increased by the balloon effect to change from laminar flow to turbulent flow, (A) and the thick part (c) of the molded product at the time of taking out can be maintained within 10 ° C as the cooling is progressed to the thick part (c) The first and second molds 10 , 11) can be uniformly cooled, thereby reducing the occurrence of deformation of the molded product, thereby making it possible to produce an optimized molded product.

As described above, the present invention is characterized in that, during the course of the '1' cycle, during the cooling step excluding the actual cooling step, which is a part of the injection step, the holding step and the cooling step, The flow of cooling water is blocked by the automatic valve.

In the present invention, the first and second molds 10 and 11 are cooled by opening / crossing the automatic valve 90 only during a pulse interval that is an actual cooling interval in the control unit 180 in the cooling step, Since the first and second molds 10 and 11 are not cooled more than necessary, the temperature of the cavity wall of the first and second molds 10 and 11 can be appropriately maintained. In cooling the conventional mold continuously, It is possible to solve the problem of raising the temperature of the molten resin or raising the temperature of the mold to an appropriate temperature by using a pre-heater or a preheater. As described above, the present invention has an advantage in that the overall cycle time and energy can be wasted without the need for a warm-up preheater or a preheater applied to adjust the temperature of a conventional mold to a proper temperature.

The first and second molds 10 and 11 are cooled only in a pulse section that is an actual cooling section in which the air layer between the inner wall of the cavity and the molded product is formed in the control section 180 so that the contraction ratio of the molded product can be reduced So that it is possible to solve problems such as deformation and warping.

In addition, the cavity wall temperature of the first and second molds 10 and 11 can be maintained at a proper temperature, and the unformed or welded portion can be minimized in the thinned portion of the molded product during the injection step. Thus, the injection step smoothly supplies the molten resin, thereby shortening the time of the injection step and the holding step.

7 and 8 show an example in which the multichannel mold temperature control method and apparatus according to the present invention as described above are applied.

This is an example in which a primary test is performed according to whether the method and apparatus according to the present invention are applied to an injection apparatus and a secondary test is performed on whether or not the method and apparatus according to the present invention are applied to the injection apparatus.

As a result of applying the first test to the method and apparatus according to the present invention, it was found that the cooling time was reduced by 33.3% as compared with the case where the method and apparatus according to the present invention were not applied. As a result of applying the method and the apparatus according to the present invention to the injection apparatus, the cooling time was reduced by 19.44% as compared with the case where the method and apparatus according to the present invention were not applied.

10: first mold 11: second mold 20: distributor 22: inflow line 24: recovery line 25:
26,27: inlet and return brackets 28: blocking plates
29: Fixing bolt 30: Nut 40: Supply connection
50: Recycle connection 60: Storage tank 90: Automatic valve
91: valve body 92:

Claims (2)

First and second molds 10 and 11;
A plurality of inlet lines 22 connected to the first and second dies 10 and 11 and connected to the first and second dies 10 and 11 for supplying and recovering cooling water, An inlet and a withdrawal bracket 26 and 27 provided on the front surface of the body 21 and communicating with the inflow line 22 and the recovery line 24, A fixing bolt 29 for fixing the inflow and recovery brackets 26 and 27 and the blocking plate 28 to the front and rear surfaces of the body 21 and a nut 30; < / RTI >
A valve body 91 integrally formed on the inflow line 22 side of the distributor 20 and an actuating part 92 mounted on the distributor 20 for guiding the opening and closing of the cooling water passing through the valve body 91 (90);
A flow rate sensor 100 installed on the inflow line 22 side of the distributor 20 for sensing a flow rate of the cooling water passing through the automatic valve 90;
A temperature sensor 110 installed on the side of the recovery line 24 of the distributor 20 for sensing the temperature of the cooling water passing through the first and second molds 10 and 11;
The temperature sensor 110, the flow rate sensor 100, and the automatic valve 90 installed in the distributor 20 and the distributor 20 are configured as one block,
The compressed air and the cooling water are moved together and the inflow line 22 and the recovery line 24 of the distributor 20 are connected to each other, An air injection device 120 for removing the scale component being generated in the cooling line of the automatic valve 90, the flow rate sensor 100, the temperature sensor 110, and the first and second dies 10 and 11;
The flow sensor 100 senses the flow rates of the cooling water supplied to the first and second molds 10 and 11 and passes through the first and second molds 10 and 11 to be recovered to the distributor 20 The temperature sensor 110 senses the temperature of the coolant flowing through the thin portion a and the thick portion c of the coolant by individually controlling the opening and closing operations of the automatic valve 90 and the flow rate of the cooling water, And a control unit (180) capable of shortening the cooling time and performing uniform cooling, and adjusting an interval between the air injecting unit (120) and the multi-channel mold temperature controlling unit.
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