KR101723365B1

KR101723365B1 - Temperature control system for molds

Info

Publication number: KR101723365B1
Application number: KR1020150091868A
Authority: KR
Inventors: 김영수
Original assignee: 김영수
Priority date: 2015-06-29
Filing date: 2015-06-29
Publication date: 2017-04-05
Also published as: KR20170002023A

Abstract

The present invention relates to a temperature control system for an injection mold that can reduce the manufacturing cost by minimizing the overall structure for rapid heating and rapid cooling of the mold, .

Description

[0001] TEMPERATURE CONTROL SYSTEM FOR MOLDS [0002]

The present invention relates to a temperature control system for an injection mold, and more particularly to a temperature control system for an injection mold, which can improve the structure of a temperature control system to enable rapid heating and rapid cooling of a mold, The present invention relates to a temperature control system for an injection mold.

As shown in FIG. 1, a conventional "high-speed injection molding mold rapid temperature control device and method" will be briefly described. A high temperature water tank 10 designed to store high-temperature and high-pressure water; A heater 20 which heats water in the hot water tank 10 by steam generated by heating the water to raise the temperature at which a phase change of liquid-gas between water occurs, thereby generating hot water; A mold 30 in which the supply valve opening / closing switch 17 is opened to supply hot water and preheated by a closed-loop rapid heating, and then an injection molding operation is performed; A low temperature water tank 40 for storing low temperature water used as cooling water; A cooling tower 60 for supplying cold water for heat exchange with cooling water to lower the temperature of the cooling water; The temperature of the cooling water is lowered through heat exchange between the cooling water flowing from the low temperature water tank 40 and the cold water flowing from the cooling tower 60 and the cooling water is supplied to the mold 30, The hot water tank 10 and the heater 20 constitute a heating circulation unit and the hot water is circulated in the mold 30 to cool the mold 30 And then returns to the hot water tank 10 via the heater 20 to perform a closed loop.

Thus, the conventional rapid temperature control apparatus and method of the mold can circulate high-temperature water in the mold instead of the high-temperature steam, so that the temperature of the mold can be rapidly heated and quenched in a shorter time than in the conventional apparatus. In addition, since waste water circulating in the water is recycled, it is possible to eliminate the waste of resources that need to be heated again by raising the low-temperature water, and it is unnecessary to change the state between the water and the steam, It is possible to greatly reduce the energy required for heating the substrate to a desired temperature and to shorten the heating time, thereby reducing costs and shortening the molding time.

However, the conventional rapid temperature control apparatus for a mold has a problem in that the overall structure for rapid heating and rapid cooling of water is complicated and efficiency is low and manufacturing cost is increased.

In the structure of the heater, water is exchanged while being in contact with the heater to heat the water, and foreign matter and scale are generated in the heater by the circulating water, so that the heater is frequently replaced. Therefore, There was a cost burden.

Published Patent Application No. 10-2010-0020836

In order to solve the above problems, the present invention reduces the manufacturing cost by simplifying the overall structure for rapid heating and rapid cooling of the mold, minimizes the rise of the internal pressure in the device for adjusting the temperature of the mold, The temperature control system of the injection mold.

According to an aspect of the present invention, there is provided a temperature control system for an injection mold, comprising: a mold; A body having a housing space communicated with the supply line and the collecting line to be circulated to the mold side and being inserted into the housing from the upper side of the body and discharging high temperature cooling water to the outside And a relief valve installed in the pressure-guiding pipe, and a water storage tank including a pressure- Wherein the cooling water inlet and outlet holes are formed in the upper and lower flanges and the cooling water inlet and outlet holes are formed in the upper and lower flanges, And a plurality of heating tanks for guiding the cooling water to circulate in a zigzag manner; A plurality of ceramic band heaters provided on the outer side of the cylinder of the heating tank; A first pump provided with a connection pipe between the heating tank and the recovery line and circulating the cooling water to the connection pipe; A first supply pipe installed between the recovery line and the water storage tank, a second supply pipe installed between the first supply pipe and the supply line, And a second pump installed in the second supply pipe for feeding the direct water or the storage water to the first and second supply pipes.

Therefore, the temperature control system of the injection mold for suppressing the internal pressure of the present invention is capable of adjusting the air pressure and the water level in the water storage tank by providing the internal pressure induction pipe in the water storage tank, thereby reducing damage to pipes and peripheral equipment There is an effect.

In addition, the present invention is capable of rapid heating and rapid cooling of a mold, thereby reducing the cycle time of the product and simplifying the overall structure,

Further, according to the present invention, a ceramic band heater is provided on the outer surface of the heating tank, and the cause of fixing of the heater generated by a conventional scale or foreign matter can be prevented in advance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an apparatus for rapid temperature control of a mold for high-gloss injection molding according to the related art,
FIG. 2 is a schematic view showing an apparatus for controlling temperature of an injection mold according to the present invention,
3 is a sectional view showing a water storage tank of the temperature control device according to the present invention,
4 is a sectional view showing a heating tank of the temperature control device according to the present invention.

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

2 and 4, the temperature control system of the injection mold according to the present invention includes a mold 10, a water storage tank 30, a heating tank 20, a ceramic band heater 100, a first pump 60, first and second supply pipes 70, 80, and a second pump 82.

The mold 10 has a conventional structure and is not specifically described. A fourth temperature sensor 11 for sensing the temperature of the mold 10 is installed.

The heating tank 20 is connected to the cylinder 21 and the upper and lower flanges 22 of the cylinder 21 and the cooling water inflow hole 23 and the discharge hole 24 And a supply induction pipe 25 is provided in the inside of the inner tube 23 so as to communicate with the inflow hole 23 and the discharge hole 24, respectively.

In addition, the heating tank 20 may be provided in two or more in series, and the inflow hole 23 and the discharge hole 24 are communicated with each other by a connection pipe 28.

In the heating tank 20, a supply line 40 for supplying cooling water to the mold 10 is connected to the discharge hole 24 provided last.

The heating tank 20 is provided with a first temperature sensor 26 for sensing the temperature of the cooling water.

The first temperature sensor 26 senses the temperature of the cooling water passing through the heating tank 20.

The ceramic band heater 100 is installed to surround the outer surface of the heating tank 20 to heat the cooling water circulated into the heating tank 20.

A plurality of ceramic band heaters 100 may be installed on the outer surface of the heating tank 20 in accordance with the capacity of the heating tank 20.

In this way, the cooling water of the heating tank 20 is conveyed in zigzag by the first pump 60, and is heated by the ceramic band heater 100.

The water storage tank 30 includes a body 31 communicating with a collection line 50 and a supply line 40 through which the cooling water having passed through the metal mold 10 is collected, An internal pressure induction pipe 32 for guiding air and cooling water to be discharged to the outside when a pressure equal to or higher than a certain level in the body 31 is raised and a relief valve 34 provided in the internal pressure induction pipe 32.

The body 31 has a predetermined accommodation space therein, and a level gauge and a safety valve can be installed on the outer surface of the body 31.

The pressure-resistance induction pipe 32 is inserted into the body 31, and a discharge guide hole 33 communicating with the inside of the pressure-induction pipe 32 is formed in a predetermined length.

When the temperature of the cooling water in the body 31 rises, the pressure in the body 31 rises and the high-temperature cooling water and steam are supplied to the relief valve 32 through the pressure induction pipe 32. 34 so as to maintain the internal pressure of the body 31 in a correct state, to secure a sufficient amount of gas in the water storage tank 30, and to adjust the water level.

The first pump 60 is connected to the recovery line 50 and is forced to suck the water in the water storage tank 30 and pressurize the cooling water to the heating tank 20 and to supply / circulate the cooling water to the mold 10 side. .

The first supply pipe 70 is connected to the recovery line 50 and the water storage tank 30 so as to be communicated with the fourth and fifth valves 71 and 72 on the line connected to the recovery line 50, And a seventh valve (73) and a third pump (74) are installed on the side of the water storage tank (30).

A drain pipe (75) is provided between the fourth and fifth valves (71, 72).

A second temperature sensor 51 is installed at the intersection of the recovery line 50 and the first supply pipe 70.

The second temperature sensor 51 senses the temperature of the cooling water recovered from the mold 10 and controls the operation of the third valve 52 and the fourth valve 71 according to the sensed temperature. (Not shown in the figure).

The second supply pipe 80 is installed between the first supply pipe 70 and the supply line 40 and is connected to the second supply pipe 80 to supply a direct water or a storage water to the second pump 82 Respectively.

A third temperature sensor 83 is provided on the suction side of the second pump 82 to sense the temperature of the direct water or the storage water. A third temperature sensor 83 is provided on the discharge side of the second pump 82 connected to the second supply pipe 80, A valve 81 is provided.

The third temperature sensor 83 senses the temperature of the direct water or the stored water supplied to the second pump 82 and transmits a signal to the controller.

Meanwhile, a first valve 41 is installed in the supply line 40 and in the rear of the connection part to the heating tank 20.

And a second valve 42 is installed between the heating tank 20 and the second supply pipe 80 in addition to the supply line 40.

As described above, according to the present invention, the function and effect of the temperature control system of the injection mold will be described. First, the operation of the second pump 82 causes the direct or stored water to flow through the mold 10 and the water storage tank 30, The heating tank 20, the supply line 40, the recovery line 50, and the first and second supply pipes 70 and 80. Then, the water level of the water storage tank 30 is filled to a predetermined height, and the ceramic band heater 100 and the first pump 60 are operated by receiving power from the outside. The cooling water is fed zigzag along the connection pipe 28 and the supply induction pipe 25 of the heating tank 20 by the operation of the first pump 60 so that the ceramic band heater 100 and circulates through the supply line 40 and the mold 10 through the recovery line 50 to be heated up to the set temperature of the mold 10. [ In this process, the first and fourth valves 41 and 71 are in the closed state and the second and third valves 42 and 52 are in the open state.

When the temperature of the mold 10 reaches the set temperature by the fourth temperature sensor 11, the second and third valves 42 and 52 are closed. At the same time, the first valve (41) opens and the high temperature cooling water is not supplied to the second valve (42), and the direction is switched to the first valve (41) 1 valve (41). At this time, if the temperature of the cooling water passing through the heating tank 20 reaches the set temperature, the operation of the ceramic band heater 100 may be stopped.

When the injection of the product is completed in the mold 10, when the second pump 82 is driven, the cooling water passes through the second supply pipe 80 and the supply line 40 through the mold 10 And sent to the collection line 50 side. At this time, the third and sixth valves (52, 81) are opened and the fourth valve (71) is closed. Here, the third temperature sensor 83 senses the temperature of the direct water and the stored water, and supplies the cooling water to the proper temperature, thereby maximizing the cooling efficiency of the metal mold 10.

The third valve 52 is continuously opened when the temperature of the cooling water transferred from the mold 10 by the second temperature sensor 51 is equal to or higher than the set temperature, When the temperature of the third valve 51 becomes equal to or lower than the set temperature, the third valve 52 is closed.

Cooling water having a temperature equal to or higher than a set temperature passing through the mold 10 is supplied to the heating tank 20 and the first line of the supply line 40 by the first pump 60, And is circulated to the valve 41 side. At this time, when the temperature above the predetermined temperature is continuously increased while circulating to the first valve (41) side of the first pump (60), the heating tank (20) and the supply line (40) , Cooling water having a temperature equal to or higher than a predetermined temperature is transferred into the water storage tank 30 so that the cooling water having a temperature equal to or higher than the set temperature is supplied into the water storage tank 30 to raise the temperature of the cooling water stored in the water storage tank 30 The relief valve 34 is opened and the cooling water stored in the water storage tank 30 is discharged to the outside along with the discharge guide hole 33 of the pressure guiding pipe 32, And the water level can be adjusted. This makes it possible to minimize the causes of troubles such as piping and peripheral equipment.

When the temperature of the cooling water passing through the recovery line 50 is lower than the set temperature by the second temperature sensor 51, the driving of the second pump 82 is stopped, The fourth valve 71 is opened and is sent to the outside through the drain pipe 75 or is filled into the water storage tank 30 through the seventh valve 73 by the third pump 74 It can be.

As described above, rapid heating and rapid cooling of the mold 10 are possible, which can reduce the cycle time of the product and simplify the overall structure, which is advantageous in that the manufacturing cost is not limited by the installation work.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. will be.

10: mold 20: heating tank
30: Water storage tank 40: Supply line
50: recovery line 60: first pump
70: first supply pipe 80: second supply pipe

Claims

A mold 10;
A body 31 communicating with the supply line 40 and the collecting line 50 for circulating the mold 10 to the mold 10 and having a receiving space therein; Pressure induction pipe 32 having a discharge inducing hole 33 for inducing high-temperature cooling water to be discharged to the outside when the internal pressure of the body 31 rises above a certain level, and a relief valve 34 (30);
A cylindrical body 21 provided between the supply line 40 and the recovery line 50 and a flange 22 coupled to upper and lower portions of the cylinder 21, 22 is formed with a cooling water inflow hole 23 and a discharge hole 24 and a supply induction pipe 25 communicating with the inflow hole 23 and the discharge hole 24 to circulate cooling water in a zigzag manner A plurality of heating tanks (20) for inducing the heating tanks (20);
A plurality of ceramic band heaters (100) installed on the outer surface of the cylinder (21) of the heating tank (20);
A first pump (60) installed between the heating tank (20) and the recovery line (50) and circulating the cooling water;
A first supply pipe 70 provided between the recovery line 50 and the water storage tank 30 and a second supply pipe 80 installed between the first supply pipe 70 and the supply line 40;
A second pump (82) installed in the second supply pipe (80) for feeding direct water or storage water to the first and second supply pipes (70, 80);
A second valve 42 is installed in the supply line 40 and the circulation of the water storage tank 30, the first pump 60, and the heating tank 20 by the closing operation of the second valve 42 And a first valve (41) for guiding the temperature of the injection mold.

The method according to claim 1,
A second temperature sensor 51 is provided at a point of intersection between the recovery line 50 and the first supply pipe 70. After the injection molding, 52, 71) of the injection mold.

delete

The method according to claim 1,
Wherein the first supply pipe (70) is provided with fourth and fifth valves (71, 72), and a drain pipe (75) is further provided between the fourth and fifth valves Temperature control system.