KR102548762B1 - Injection mold supporting cooling using two coolants with different temperatures - Google Patents

Abstract

The present invention discloses an injection mold supporting cooling using two coolants having different temperatures. The injection mold includes a fixed mold (1) and a movable mold (2); a runner separation assembly 400 separating the runner injection molding material RP formed in the fixed mold 1; and a cooling device 800 for circulating first cooling water and second cooling water having different temperatures in at least one of the stationary mold 1 and the movable mold 2, wherein the cooling device 800, a first tank 810 in which the first cooling water is stored; a second tank 820 in which second cooling water having a temperature relatively lower than that of the first cooling water is stored; a first heat exchanger 811 disposed inside the first tank 810 and exchanging heat between the first cooling water and the refrigerant; a second heat exchanger 821 disposed inside the second tank 820 and exchanging heat between the second cooling water and the refrigerant; Compressor 801 for compressing the refrigerant; a first refrigerant pipe 851 connecting the compressor 801 and the first heat exchanger 811; a second refrigerant pipe 852 connecting the first heat exchanger 811 and the second heat exchanger 821; a third refrigerant pipe 853 connecting the second heat exchanger 821 and the compressor 801; an electronic expansion valve 802 disposed in the second refrigerant pipe 852 and expanding the refrigerant flowing from the first heat exchanger 811 to the second heat exchanger 821; It is disposed in the third refrigerant pipe 853, receives the refrigerant flowing from the second heat exchanger 821 to the compressor 801, separates the liquid refrigerant from the gaseous refrigerant, and transfers the separated gaseous refrigerant to the compressor ( an accumulator 803 provided to 801); and a controller 895 controlling operations of the compressor 801, the electronic expansion valve 802, and the accumulator 803 according to a cooling cycle.

Description

Injection mold supporting cooling using two coolants having different temperatures {INJECTION MOLD SUPPORTING COOLING USING TWO COOLANTS WITH DIFFERENT TEMPERATURES}

The present invention relates to a technique for cooling an injection mold, and more particularly, to an injection mold supporting cooling using two coolants having different temperatures.

Injection molding is a manufacturing method in which a synthetic resin is injected into the space between a cavity and a core and then cooled to make a molded product.

Molds for injection molding are mainly used to manufacture materials for automobile parts, aircraft parts, computers, and mobile phones, and are the most commonly used molds for making everyday products.

Injection molds are usually divided into 2-stage and 3-stage injection molds. Among them, 3-stage injection molds are small parts that require mass production, parts that require precision, parts that do not have a gate exposed to the outside, and resin. It has characteristics suitable for molding large parts that are not easy to flow.

A temperature controller is connected to the conventional injection mold, hot water heated to 100 degrees or less is supplied to properly maintain the temperature of the mold, and cooling water is supplied from the temperature controller to maintain an appropriate temperature for molding during injection.

For example, since the temperature control of the mold has a significant effect on the appearance, electrical properties, shrinkage, and dimensions of an injection-molded product, the temperature of the mold during molding must be appropriately adjusted according to the characteristics of the injection-molded product.

However, the conventional injection mold described above has a problem in that temperature control is not precise because only one type of cooling water is supplied.

Republic of Korea Patent No. 1598129 Republic of Korea Patent No. 1912564

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide an injection mold that supports cooling using two coolants having different temperatures.

The present invention includes a fixed mold (1) and a movable mold (2); and a cooling device 800 for circulating cooling water having different temperatures in the stationary mold 1 and the movable mold 2, wherein the cooling device 800 includes: a first tank in which a first cooling water is stored; A second tank in which the second cooling water is stored, wherein the first cooling water forms a higher temperature than the second cooling water, and either the first cooling water or the second cooling water is applied to the fixed mold 1 or the movable Provided is a runner take-out type injection mold that circulates through one of the molds (2).

The cooling device 800 includes a first heat exchanger 811 disposed inside the first tank 810 and exchanging heat between the first cooling water and the refrigerant; a second heat exchanger 821 disposed inside the second tank 820 and exchanging heat between the second cooling water and the refrigerant; Compressor 801 for compressing the refrigerant; a first refrigerant pipe 851 connecting the compressor 801 and the first heat exchanger 811; a second refrigerant pipe 852 connecting the first heat exchanger 811 and the second heat exchanger 821; a third refrigerant pipe 853 connecting the second heat exchanger 821 and the compressor 801; an electronic expansion valve 802 disposed in the second refrigerant pipe 852 and expanding the refrigerant flowing from the first heat exchanger 811 to the second heat exchanger 821; It is disposed in the third refrigerant pipe 853, receives the refrigerant flowing from the second heat exchanger 821 to the compressor, separates the liquid refrigerant from the gaseous refrigerant, and transfers the separated gaseous refrigerant to the compressor 801. An accumulator 803 provided; may be included.

The first heat exchanger may operate as a condenser condensing the refrigerant, and the second heat exchanger may operate as an evaporator evaporating the refrigerant.

A flow control box 860 connected to the first tank and the second tank and circulating the first cooling water of the first tank or the second cooling water of the second tank to either the fixed mold or the movable mold may be further included. can

The present invention, a fixed mold (1) and a movable mold (2); A cooling device 800 circulating cooling water having different temperatures in the stationary mold 1 and the movable mold 2, wherein the cooling device 800 is disposed inside the first tank 810, , a first heat exchanger 811 for exchanging heat between the first cooling water and the refrigerant; a second heat exchanger 821 disposed inside the second tank 820 and exchanging heat between the second cooling water and the refrigerant; Compressor 801 for compressing the refrigerant; a first refrigerant pipe 851 connecting the compressor 801 and the first heat exchanger 811; a second refrigerant pipe 852 connecting the first heat exchanger 811 and the second heat exchanger 821; a third refrigerant pipe 853 connecting the second heat exchanger 821 and the compressor 801; an electronic expansion valve 802 disposed in the second refrigerant pipe 852 and expanding the refrigerant flowing from the first heat exchanger 811 to the second heat exchanger 821; It is disposed in the third refrigerant pipe 853, receives the refrigerant flowing from the second heat exchanger 821 to the compressor, separates the liquid refrigerant from the gaseous refrigerant, and transfers the separated gaseous refrigerant to the compressor 801. an accumulator 803 to provide; a flow control box 860 connected to the first tank and the second tank and circulating the first cooling water of the first tank or the second cooling water of the second tank to either the fixed mold or the movable mold; The hot water supply pipe 871 and the hot water recovery pipe 872 connecting the flow control box 860 and the first tank 810 are connected to the flow control box 860 and the second tank 820. The low temperature water supply pipe 873 and the low temperature water recovery pipe 874, and the movable mold supply pipe 875 and the movable mold recovery pipe 876 connecting the flow control box 860 and the movable mold 2, , the first pump 804 disposed in the fixed mold supply pipe 877 and the fixed mold recovery pipe 878 connecting the flow control box 860 and the fixed mold 1, and the movable mold supply pipe 875 ) and a second pump 805 disposed in the fixed mold supply pipe 877; a first temperature sensor 881 disposed in the movable mold supply pipe 875; a second temperature sensor 882 disposed in the movable mold recovery pipe 876; a third temperature sensor 883 disposed in the fixed mold supply pipe 877; a fourth temperature sensor 884 disposed in the fixed mold recovery pipe 878; a core temperature sensor 885 disposed in the fixed mold 1; A runner take-out type injection mold including a cavity temperature sensor 886 disposed in the movable mold is provided.

The present invention comprises the steps of comparing the temperature detected by the core temperature sensor 885 disposed in the fixed mold 1 with a reference temperature (S110); If the step S110 is satisfied, supplying the first cooling water to the fixed mold 1 by controlling the passage control box 860 (S120); After the step S120, determining whether the first temperature difference between the second temperature sensor 882 and the first temperature sensor 881 is greater than 0 and less than a first reference value (S130); If the step S130 is not satisfied, increasing the opening value of the first flow control valve 806 (S140); After the step S140, determining whether the first temperature difference between the second temperature sensor 882 and the first temperature sensor 881 is greater than 0 and less than a first reference value (S150); If the step S150 is not satisfied, the passage control box 860 is controlled to block the supply of the first cooling water to the fixed mold 1, and to supply the second cooling water to the fixed mold 1. Step (S160); After the step S160, determining whether the second temperature difference between the fourth temperature sensor 884 and the third temperature sensor 883 is greater than 0 and less than a second reference value (S170); If the step S170 is not satisfied, increasing the opening value of the second flow control valve 807 (S180); After the step S180, determining whether the second temperature difference between the fourth temperature sensor 884 and the third temperature sensor 883 is greater than 0 and less than a second reference value (S190); If the above step S190 is not satisfied, outputting a fixed mold overheat error code (S195); provides a method for controlling a cooling device for a runner take-out type injection mold including.

The present invention comprises the steps of comparing the temperature sensed by the cavity temperature sensor 886 disposed in the movable mold 2 with a reference temperature (S210); If the step S210 is satisfied, supplying the first cooling water to the movable mold 2 by controlling the passage control box 860 (S220); After the step S220, determining whether the first temperature difference between the second temperature sensor 882 and the first temperature sensor 881 is greater than 0 and less than a first reference value (S230); If the step S230 is not satisfied, increasing the opening value of the first flow control valve 806 (S240); After the step S240, determining whether the first temperature difference between the second temperature sensor 882 and the first temperature sensor 881 is greater than 0 and less than a first reference value (S250); If the step S250 is not satisfied, the passage control box 860 is controlled to block the supply of the first cooling water to the movable mold 2 and to supply the second cooling water to the movable mold 2. Step (S260); After the step S260, determining whether the second temperature difference between the fourth temperature sensor 884 and the third temperature sensor 883 is greater than 0 and less than a second reference value (S270); If the step S270 is not satisfied, increasing the opening value of the second flow control valve 807 (S280); After the step S280, determining whether the second temperature difference between the fourth temperature sensor 884 and the third temperature sensor 883 is greater than 0 and less than a second reference value (S290); If the step S290 is not satisfied, a step of outputting a movable mold overheating error code (S295); provides a method for controlling a cooling device for a runner take-out type injection mold including.

First, since the present invention includes a cooling device capable of supplying cooling water of different temperatures, it is possible to supply cooling water of an appropriate temperature according to the temperature of a fixed mold or a movable mold, thereby preventing the temperature of the mold from rapidly lowering. There are advantages to doing so.

Second, the present invention detects the temperature change by supplying the first cooling water having a high temperature, and when the cooling is not sufficient, increases the flow rate of the first cooling water and supplies it, then detects the temperature change again, and nevertheless cools If it is not sufficient, since cooling is performed by supplying the second cooling water having a low temperature, there is an advantage in preventing the temperature of the mold from rapidly lowering.

1 is a schematic cross-sectional view of an injection mold including a cooling device according to a first embodiment of the present invention.
FIG. 2 is a first diagram illustrating an operation example of the cooling device shown in FIG. 1 .
3 is a second diagram illustrating an operation example of the cooling device shown in FIG. 1;
4 is a third diagram illustrating an operation example of the cooling device shown in FIG. 1;
5 is a fourth diagram illustrating an operation example of the cooling device shown in FIG. 1;
6 is a flowchart illustrating a control method of an injection mold for cooling a movable mold.
7 is a flowchart illustrating a control method of an injection mold for cooling a fixed mold.
8 is a cross-sectional view showing only the injection mold from the injection mold including a cooling device according to an embodiment of the present invention.
9 is a partial enlarged view of FIG. 8 .
10 is a first view of an operation example showing an injection molding operation according to the injection mold of FIG. 8 .
11 is a second view showing an operation example of an injection molding operation according to the injection mold of FIG. 8 .
12 is a third view of an operation example showing an injection molding operation according to the injection mold of FIG. 8 .
FIG. 13 is a fourth view illustrating an operation example of an injection molding operation according to the injection mold of FIG. 8 .
FIG. 14 is a fifth view of an operation example showing an injection molding operation according to the injection mold of FIG. 8 .
15 is an enlarged view of a runner separation assembly according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification of the present invention, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated.

1 is a schematic cross-sectional view of an injection mold including a cooling device according to a first embodiment of the present invention. FIG. 2 is a first diagram illustrating an operation example of the cooling device shown in FIG. 1 . 3 is a second diagram illustrating an operation example of the cooling device shown in FIG. 1; 4 is a third diagram illustrating an operation example of the cooling device shown in FIG. 1; 5 is a fourth diagram illustrating an operation example of the cooling device shown in FIG. 1; 6 is a flowchart illustrating a control method of an injection mold for cooling a movable mold. 7 is a flowchart illustrating a control method of an injection mold for cooling a fixed mold.

The injection mold according to this embodiment includes a fixed mold (1), a movable mold (2), and a cooling device (800) for circulating cooling water of different temperatures in the fixed mold (1) and the movable mold (2). do.

The cooling device 800 is disposed inside a first tank 810 for storing the first cooling water, a second tank 820 for storing the second cooling water, and the first tank 810, 1. A first heat exchanger 811 for heat exchange between the cooling water and the refrigerant, a second heat exchanger 821 disposed inside the second tank 820 for heat exchange between the second cooling water and the refrigerant, and compressing the refrigerant. A compressor 801, a first refrigerant pipe 851 connecting the compressor 801 and the first heat exchanger 811, and connecting the first heat exchanger 811 and the second heat exchanger 821 The second refrigerant pipe 852, the third refrigerant pipe 853 connecting the second heat exchanger 821 and the compressor 801 are disposed in the second refrigerant pipe 852, and the first heat exchange The electronic expansion valve 802 expands the refrigerant flowing from the machine 811 to the second heat exchanger 821, and is disposed in the third refrigerant pipe 853, and the compressor in the second heat exchanger 821 and an accumulator 803 that receives the refrigerant flowing into the refrigerant, separates the liquid refrigerant from the gaseous refrigerant, and provides the separated gaseous refrigerant to the compressor 801.

The cooling device 800 includes a flow control box 860 connected in parallel to the first tank 810 and the second tank 820, and the flow control box 860 and the first tank 810. The hot water supply pipe 871 and the hot water recovery pipe 872 connected thereto, and the cold water supply pipe 873 and the cold water recovery pipe 874 connecting the flow control box 860 and the second tank 820. ), the movable mold supply pipe 875 and the movable mold recovery pipe 876 connecting the flow control box 860 and the movable mold 2, and the flow control box 860 and the fixed mold 1 The fixed mold supply pipe 877 and the fixed mold recovery pipe 878 connected to each other, the first pump 804 disposed in the movable mold supply pipe 875, and the first pump disposed in the fixed mold supply pipe 877 2 pumps 805.

The cooling device 800 periodically compresses the refrigerant of the compressor 801,

The refrigerant discharged from the compressor 801 passes through the first heat exchanger 811, the electronic expansion valve 802 and the second heat exchanger 821 and is returned to the compressor 801 to operate in a cooling cycle.

The first heat exchanger 811 operates as a condenser condensing the refrigerant, and the second heat exchanger 821 operates as an evaporator evaporating the refrigerant.

The cooling device 800 may further include a controller 895 that sequentially controls operations of the compressor 801, the electronic expansion valve 802, and the accumulator 803 according to a cooling cycle.

The controller 895 controls the flow path control box 860 based on the temperature detected by the cavity temperature sensor 886 installed in the fixed mold 1 or the temperature detected by the core temperature sensor 885 installed in the movable mold 2. ) can be controlled.

For example, the controller 895 may be a Micro Controller Unit (MCU) or a processor that processes instructions indicating at least one operation.

The first heat exchanger 811 exchanges heat between the refrigerant and water, and the water stored in the first tank 810 is heated through heat released during condensation of the refrigerant.

Water in the first tank 810 may be formed at 30 degrees to 50 degrees by the heat of condensation of the refrigerant. Water supplied from the first tank 810 is defined as first cooling water, and the first cooling water is lower than the temperature of the resin used in the injection mold.

The second heat exchanger 821 exchanges heat between the refrigerant and water, and the water stored in the second tank 820 is cooled through heat absorbed from the water stored in the second tank 820 during the evaporation of the refrigerant.

The water in the second tank 820 may be formed at 0 to 10 degrees by the evaporation heat of the refrigerant. Water supplied from the second tank 820 is defined as the second cooling water, and the second cooling water is lower than the temperature of the resin used in the injection mold.

The temperature of the first cooling water is higher than the temperature of the second cooling water and lower than the temperature of the resin.

The hot water supply pipe 871 and the hot water recovery pipe 872 connect the first tank 810 and the flow control box 860, and check valves are respectively disposed to prevent the cooling water from flowing backward.

The cold water supply pipe 873 and the cold water recovery pipe 874 connect the second tank 820 and the flow control box 860, and check valves are respectively disposed to prevent the cooling water from flowing backward.

The flow control box 860 includes a first tank suction port 831 connected to the first tank, a first tank discharge port 832, a second tank suction port 833 connected to the second tank, and a second tank discharge port 832 connected to the second tank. A tank discharge port 834 is included.

The high temperature water supply pipe 871 is connected to the first tank suction port 831, the high temperature water recovery pipe 872 is connected to the first tank discharge port 832, and the low temperature water supply pipe 872 is connected to the second tank suction port 833. The water supply pipe 873 is connected, and the low-temperature water recovery pipe 874 is connected to the second tank discharge port 834.

The flow control box 860 includes a first mold discharge port 841 connected to the fixed mold 1, a first mold recovery port 842, a second mold discharge port 843 connected to the movable mold, 2 mold return port 844.

The movable mold supply pipe 875 is connected to the first mold discharge port 841, the movable mold return pipe 876 is connected to the first mold return port 842, and fixed to the second mold discharge port 843. The mold supply pipe 877 is connected, and the fixed mold recovery pipe 878 is connected to the second mold recovery port 844.

A first pump 804 is disposed in the movable mold supply pipe 875, and a first flow control valve 806 for adjusting the flow rate discharged from the first pump 804 is disposed.

A second pump 805 is disposed in the fixed mold supply pipe 877, and a second flow control valve 807 for adjusting the flow rate discharged from the second pump 805 is disposed.

A first temperature sensor 881 is disposed in the movable mold supply pipe 875, a second temperature sensor 882 is disposed in the movable mold recovery pipe 876, and a third temperature sensor is disposed in the fixed mold supply pipe 877. 883 is disposed, and a fourth temperature sensor 884 is disposed in the fixed mold recovery pipe 878.

In the injection mold, a core temperature sensor 885 disposed on the core 610 in the movable mold 2 and a cavity temperature sensor disposed on the fixed side template 200 forming the cavity 210 in the fixed mold 1 (886).

The core temperature sensor 885 is disposed inside the core to directly sense the temperature of the core forming the molded product MP.

The cavity temperature sensor 886 is disposed around the gate 230 to directly sense the temperature around the cavity 210 adjacent to the gate 230 .

The control unit 895 supplies the first cooling water or the second cooling water to the fixed mold 1 according to the temperature of the core temperature sensor 885, and measures the temperature difference between the first temperature sensor 881 and the second temperature sensor 882. A temperature change of the first cooling water or the second cooling water supplied to the fixed mold 1 may be sensed through and the first flow control valve 806 may be controlled according to the detected temperature change.

A temperature difference between the first temperature sensor 881 and the second temperature sensor 882 is defined as a first temperature difference. The "first temperature difference = (measured temperature of the second temperature sensor - measured temperature of the first temperature sensor)", and the value of the first temperature difference is a positive number.

That is, when the first cooling water or the second cooling water is supplied to the fixed mold 1 and then circulated and discharged, the temperature is increased and discharged, and in normal cases, the temperature of the second temperature sensor 882 is changed to the first temperature sensor ( 881).

The control unit 895 increases the flow rate of the first cooling water or the second cooling water supplied to the fixed mold 2 by increasing the opening value of the first flow control valve 806 when the first temperature difference is large, When the first temperature difference is small, the flow rate of the first cooling water or the second cooling water supplied to the fixed mold 2 is reduced by decreasing the opening value of the first flow control valve 806 .

This is a control logic corresponding to both the first cooling water and the second cooling water.

If the first temperature difference is greater than the first reference value despite supplying the first cooling water having a temperature lower than that of the resin, it is determined that the first cooling water is overheated, the supply of the first cooling water is cut off, and the temperature of the first cooling water is relatively lower than that of the first cooling water. The second cooling water is supplied to the fixed mold (1).

The first temperature difference and the first reference value may vary according to a temperature range of a resin for producing the molded product MP.

The control unit 895 supplies the first cooling water or the second cooling water to the movable mold 2 according to the temperature of the cavity temperature sensor 886, and the temperature difference between the third temperature sensor 883 and the fourth temperature sensor 884 Detects the temperature change of the first cooling water or the second cooling water supplied to the movable mold 2 through and adjusts the second flow rate according to the temperature change of the first cooling water or the second cooling water supplied to the movable mold 2 Valve 807 can be controlled.

A temperature difference between the second temperature sensor 883 and the fourth temperature sensor 884 is defined as a second temperature difference. The "second temperature difference = (measured temperature of the fourth temperature sensor - measured temperature of the third temperature sensor)", and the value of the second temperature difference is a positive number.

That is, when the first cooling water or the second cooling water is supplied to the movable mold 2 and then circulated and discharged, the temperature is increased and discharged, and in normal cases, the temperature of the fourth temperature sensor 884 is changed to the third temperature sensor ( 883).

The control unit 895 increases the flow rate of the first cooling water or the second cooling water supplied to the movable mold 2 by increasing the opening value of the second flow control valve 807 when the second temperature difference is large, When the second temperature difference is small, the opening value of the second flow control valve 807 is reduced to reduce the flow rate of the first cooling water or the second cooling water supplied to the movable mold 2 .

This is a control logic corresponding to both the first cooling water and the second cooling water.

After the first cooling water is supplied to the movable mold 2, if the second temperature difference is greater than the second reference value, it is determined that the movable mold 2 is overheated, the supply of the first cooling water is cut off, and the temperature is relatively lower than that of the first cooling water. The second cooling water is supplied to the movable mold (2).

The second temperature difference and the second reference value may vary according to the temperature range of the resin for producing the molded product MP.

2, when the first cooling water is supplied to the movable mold 2, the flow control box 860 connects the first tank suction port 831 and the first mold discharge port 841, and the second tank The suction port 832 and the second mold discharge port 842 are connected.

Pipes and valves capable of changing the flow path through control signals may be disposed inside the flow control box 860, and since this is a common technique for those skilled in the art, a detailed description thereof will be omitted.

Referring to FIG. 3 , when the second cooling water is supplied to the fixed mold 1, the flow control box 860 connects the second tank suction port 833 and the second mold discharge port 843, and the second tank The discharge port 834 and the second mold recovery port 844 are connected.

4, when the first cooling water is supplied to the fixed mold 1, the flow control box 860 connects the first tank suction port 831 and the second mold discharge port 843, and the second tank The suction port 832 and the second mold recovery port 844 are connected.

Referring to FIG. 5, when the second cooling water is supplied to the movable mold 2, the flow control box 860 connects the second tank suction port 833 and the first mold discharge port 841, and the second tank The discharge port 834 and the second mold discharge port 842 are connected.

Referring to FIG. 6 , this embodiment performed by the cooling device 800 (or more specifically, performed by the control unit 895 included in the cooling device 800) to cool the movable mold 2 The injection mold control method according to the example includes the steps of comparing the temperature detected by the core temperature sensor 885 installed in the movable mold 2 with a first reference temperature (S110), and the temperature detected in step S110 is the reference temperature. When the temperature exceeds the temperature, supplying the first cooling water to the fixed mold 1 by controlling the flow control box 860 (S120), and the second temperature sensor at the time of the lapse of the first preset time after the step S120 Step (S130) of determining whether the first temperature difference between the 882 and the first temperature sensor 881 is greater than 0 and less than a first reference value, and if the first temperature difference is greater than the first reference value in step S130, the first Step 1 of increasing the opening value of the flow control valve 806 (S140), and at the lapse of a preset second time after the step S140, the second temperature sensor 882 and the first temperature sensor 881 1 Determining whether the temperature difference is greater than 0 and less than a first reference value (S150), and when the first temperature difference is greater than the first reference value in the step S150, controls the flow path control box 860 so that the first cooling water is Blocking the supply to the stationary mold 1 and supplying the second cooling water to the movable mold 2 (S160), and a second temperature sensor (882) at the lapse of a preset first time after the step S160. ) and the first temperature sensor 881, determining whether the first temperature difference is greater than 0 and smaller than the second reference value (S170), and when the first temperature difference is greater than the second reference value in step S170, the first flow rate The first temperature difference between the second temperature sensor 882 and the first temperature sensor 881 at the time of increasing the opening value of the control valve 806 (S180) and a second preset time after the step S180. Determining whether is greater than 0 and less than a second reference value (S190), and outputting a movable mold overheating error code when the first temperature difference is greater than the second reference value in step S190 (S195).

When the temperature detected in step S110 does not exceed the first reference temperature, it is determined that the temperature of the movable mold 2 is lower than the reference temperature, and the first cooling water and the second cooling water are not supplied.

When the first temperature difference is greater than 0 and less than the first reference value in step S130, the process returns to step S120 and the first cooling water is continuously supplied.

When the case where the first temperature difference is greater than 0 and less than the first reference value is satisfied in step S150, the process returns to step S140, and the first cooling water with increased flow rate is continuously supplied.

When the first temperature difference is greater than 0 and less than the first reference value in step S170, the process returns to step S160, and the second cooling water is continuously supplied.

When the first temperature difference is greater than 0 and less than the first reference value in step S190, the process returns to step S180, and the second cooling water with increased flow rate is continuously supplied.

Referring to FIG. 7 , in order to cool the fixed mold 1, the injection mold performed by the cooling device 800 (or more specifically, performed by the control unit 895 included in the cooling device 800) The control method includes the step of comparing the temperature detected by the cavity temperature sensor 886 installed in the fixed mold 1 with the second reference temperature (S210), and the temperature detected in step S210 exceeds the second reference temperature. In this case, the step of supplying the first coolant to the fixed mold 1 by controlling the flow control box 860 (S220), and the fourth temperature sensor 884 at the lapse of a preset first time after the step S220 and determining whether the second temperature difference between the third temperature sensors 883 is larger than 0 and smaller than the first reference value (S230), and if the second temperature difference is greater than the first reference value in step S230, the second flow rate is adjusted. The second temperature difference between the fourth temperature sensor 884 and the third temperature sensor 883 at the time of increasing the opening value of the valve 807 (S240) and a preset second time after the step S240. Determining whether is greater than 0 and less than a first reference value (S250), and when the second temperature difference is greater than the first reference value in the step S250, the flow control box 860 is controlled so that the first cooling water forms the fixed mold Blocking the supply to (1) and supplying the second cooling water to the fixed mold 1 (S260), and at the time of elapse of the first preset time after the step S260, the fourth temperature sensor 884 and Determining whether the second temperature difference of the third temperature sensor 883 is greater than 0 and smaller than the second reference value (S270), and when the second temperature difference is greater than the second reference value in step S270, the second flow control valve ( 807), the second temperature difference between the fourth temperature sensor 884 and the third temperature sensor 883 is greater than 0 after the step of increasing the opening degree (S280) and the lapse of a preset second time after the step S280. It includes determining whether it is smaller than the second reference value (S290), and outputting a fixed mold overheating error code when the second temperature difference is greater than the second reference value in the step S290 (S295).

If the temperature detected in step S210 does not exceed the second reference temperature, it is determined that the temperature of the fixed mold 1 is lower than the reference temperature, and the first cooling water and the second cooling water are not supplied.

When the second temperature difference is smaller than the first reference value in step S230, the process returns to step S220 and the first cooling water is continuously supplied.

When the second temperature difference is less than the first reference value in step S250, the process returns to step S240, and the first cooling water with increased flow rate is continuously supplied.

When the second temperature difference is smaller than the first reference value in step S270, the process returns to step S260, and the second cooling water is continuously supplied.

When the second temperature difference is smaller than the first reference value in step S290, the process returns to step S280, and the second cooling water with increased flow rate is continuously supplied.

8 is a cross-sectional view showing only the injection mold from the injection mold including a cooling device according to an embodiment of the present invention. 9 is a partial enlarged view of FIG. 8 . 10 is a first view of an operation example showing an injection molding operation according to the injection mold of FIG. 8 . 11 is a second view showing an operation example of an injection molding operation according to the injection mold of FIG. 8 . 12 is a third view of an operation example showing an injection molding operation according to the injection mold of FIG. 8 . FIG. 13 is a fourth view illustrating an operation example of an injection molding operation according to the injection mold of FIG. 8 . FIG. 14 is a fifth view of an operation example showing an injection molding operation according to the injection mold of FIG. 8 .

The runner take-out type three-stage injection mold of the present invention separates the fixed mold (1) and the movable mold (2) and the runner injection molding (RP) disposed in the fixed mold (1) and formed in the stationary mold (1) It includes a runner separation assembly 400.

In this embodiment, the movable mold 2 may be moved in a horizontal direction to be in close contact with the stationary mold 1.

The stationary mold 1 is disposed on the side of the movable mold 2 based on the fixed-side mounting plate 100 on which the sprue 110 is formed and the fixed-side mounting plate 100, and the cavity 210 is formed. It includes a fixed-side template 200 and a stripper plate 300 disposed between the fixed-side template 200 and the fixed-side installation plate 100 and to which one surface of the runner injection molding material RP is in close contact during injection.

In this embodiment, the fixed-side installation plate 100, the stripper plate 300, and the fixed-side template 200 are sequentially stacked from right to left in the drawing. In the fixed mold 1, guide pins (GP) penetrating the fixed-side mounting plate 100, the stripper plate 300, and the fixed-side template 200 may be further disposed, and the stripper plate 300 and the fixed The side template 200 may move along the guide pins GP.

The runner separation assembly 400 includes a runner pin 401 disposed to pass through the stripper plate 300 and an elastic member that elastically supports the runner pin 401 and is inserted into the fixed side installation plate 100 440, a first ferromagnetic body 450 disposed on the fixed side mounting plate 100, and a first ferromagnetic body 450 disposed on the runner pin 401, forming an attraction through magnetic force with the first ferromagnetic body 450 2 The ferromagnetic material 460 and the runner pin 401 disposed on the fixed-side mounting plate 100 are moved to the fixed-side template 200 to form the first ferromagnetic material 450 and the second ferromagnetic material 460. and an actuator 470 that releases the attractive force between the first ferromagnetic material 450 and the second ferromagnetic material 460 by spacing them apart.

The runner separation assembly 400 is installed on the fixed-side mounting plate 100 and the stripper plate 300, and presses the runner injection molding material (RP) toward the movable mold (2), so that the stripper plate 300 is in close contact with the The runner injection product (RP) can be separated from the stripper plate (300).

In this embodiment, the runner separation assembly 400 ejects the runner pin 401 with a mechanism like a crossbow.

In the runner separation assembly 400, since the attractive force of the first ferromagnetic body 450 and the second ferromagnetic body 460 is greater than the elastic force of the elastic member 440, the first ferromagnetic body 450 and the second ferromagnetic body 460 When is approached, the runner pin 401 can maintain close contact with the fixed-side installation plate 100 due to attraction by magnetic force.

When the actuator 470 separates the first ferromagnetic material 450 and the second ferromagnetic material 460 to release the attractive force (when the elastic force is formed greater than the attractive force through the separation), the elastic force of the elastic member 440 The runner injection molding material RP may be separated by hitting the right side of the runner injection molding material RP by the runner pin 401 .

The runner pin 401 is inserted into the stripper plate 300 and slides, and the first pin body 410 protrudes from the first pin body 410 in the opposite direction to the stripper plate 300 to The second pin body 420 inserted into the fixed-side installation plate 100 and protruding outward from either the first pin body 410 or the second pin body 420, the stripper plate 300 ) and a locking body 430 forming a mutual lock.

In this embodiment, the first pin body 410 and the second pin body 420 are formed in a cylindrical shape. Unlike the present embodiment, at least one of the first pin body 410 and the second pin body 420 may be formed in an angular shape.

In this embodiment, the left side of the first pin body 410 is the hitting surface 411 in contact with the runner injection molding material RP.

The elastic member 440 uses a coil spring and is disposed to surround the outer circumferential surface of the second pin body 420 .

In order to minimize the installation space by the elastic member 440, the diameter of the second pin body 420 may be formed smaller than the diameter of the first pin body 410.

The left end of the elastic member 440 is in close contact with the locking body 430, and the right end is in close contact with the fixed side mounting plate 100.

In order to prevent the elastic member 440 from being displaced, the runner pin 401 is formed on the locking body 430, and a locking groove 435 into which the elastic member 440 is inserted may be further formed. there is.

In this embodiment, the locking body 430 has a ring shape protruding outward in the radial direction from the first pin body 410 .

The hooking body 430 forms a mutual hooking with the stripper plate 300 to prevent the elastic member 440 from leaving the stripper plate 300, the first hooking part 431 and the first hooking part ( It includes a second hooking part 432 bent toward the fixing side installation plate 100 at 431 to form the hooking groove 435 .

The second locking portion 432 is spaced apart from the outer circumferential surface of the second pin body 420 to form the locking groove 435 .

The stripper plate 300 is connected to the first runner hole 310 into which the first pin body 410 is inserted and slides, and the first runner hole 310, and is more than the first runner hole 310. It is formed with a large diameter and includes a stopper groove 320 forming mutually engaging with the first engaging portion 431 .

The first runner hole 310 has a hole shape in which left and right sides are respectively opened so as to pass through the stripper plate 300 .

The stopper groove 320 is a ring-shaped groove formed concavely from the right side of the stripper plate 300 toward the left side, and the first runner hole 310 is disposed at the center of the stopper groove 320.

The fixed-side mounting plate 100 is a plate fixed to the rightmost side of the injection mold.

The fixed-side installation plate 100 includes a sprue bush 120 forming the sprue 110 and a locating ring 130 fixing the sprue bush 120 .

A sprue 110 is formed inside the sprue bush 120, and the formed sprue 110 serves as an injection hole for injecting molten resin from a nozzle, and at the same time, the injected resin is passed through the runner 220 and the gate 230, the locating ring 130 fixes the sprue bush 120 under high injection pressure.

The sprue bush 120 is formed on the right side of the fixed side installation plate 100. The sprue bush 120 is formed concave from the right side of the fixed side mounting plate 100 to the left side, and the sprue 110 penetrates the stripper plate 300 at the inner center of the sprue bush 120 By being formed, the resin passes through the stripper plate 300 and reaches the runner 220 and the gate 230.

The fixed-side installation plate 100 is connected to the second runner hole 140 into which the second pin body 420 is inserted and slides, and the second runner hole 140, and the elastic member 440 It further includes a locking groove 145 into which the right end is inserted and supported.

The locking groove 145 is formed concavely with a smaller diameter than the second runner hole 140 at the right end of the second runner hole 140 .

When viewed from the left side of the fixed-side installation plate 100, the locking groove 145 is formed in a concave ring shape, and a pin support portion 146 supporting the second pin body 420 is formed on the inside. The pin support portion 146 is formed in a circular shape.

In this embodiment, the second hooking part 432 is also inserted into the second runner hole 140 and slides.

The first ferromagnetic material 450 and the second ferromagnetic material 460 are permanent magnets forming N poles and S poles, respectively, and neodymium material may be used in this embodiment.

The first ferromagnetic material 450 is disposed on the pin support part 146, and the second ferromagnetic material 460 is disposed on the right side of the second pin body 420.

The first ferromagnetic material 450 and the second ferromagnetic material 460 are disposed to face each other.

The first ferromagnetic material 450 and the second ferromagnetic material 460 are spaced apart from the axis center O of the runner pin 401 by a predetermined distance.

Each of the first ferromagnetic material 450 and the second ferromagnetic material 460 may be disposed in plurality. A plurality of the first ferromagnetic material 450 and the second ferromagnetic material 460 may be arranged in a circumferential direction while being spaced apart from each other by a predetermined radius around the axis O.

When the first ferromagnetic material 450 and the second ferromagnetic material 460 are brought closer to each other by a predetermined distance or more, they may be attracted to each other and brought into close contact with each other due to attraction caused by magnetic force.

When the actuator 470 pushes the runner pin 401 to separate the first ferromagnetic material 450 and the second ferromagnetic material 460 by a predetermined distance or more, an arrow is fired from the crossbow by the elastic force of the elastic member 440 The runner pin 401 may be ejected from the first runner hole 310 .

The injection distance of the injected runner pin 401 is limited by the first hooking part 431 being caught in the stopper groove 320 .

Since the runner pin 401 is injected like an arrow, the runner injection material RP adhering to the left side of the stripper plate 300 can be quickly separated.

The actuator 470 includes a piston 471 that pushes or pulls the runner pin 401 and a cylinder 472 that moves the piston 471 forward or backward. The actuator 470 may move the piston 471 to the left or to the right by supplying or discharging working fluid.

The piston 471 includes a piston head 473 providing operating force to the runner pin 401 and a piston rod 474 connected to the piston head 473 and connected to the cylinder 472.

The piston head 473 and the piston rod 474 are disposed at the center of the axis O, and can move left and right along the center of the axis O.

The first ferromagnetic material 450 and the second ferromagnetic material 460 may be disposed outside the piston rod 474 in the radial direction.

The runner pin 401 includes a head space 480 in which the piston head 473 is accommodated and the piston head 473 slides in the left and right directions, and the head space 480 at one side of the head space 480. ) It may further include a rod hole 424 extending to a narrower diameter than the piston rod 474 to slide.

The rod hole 424 is formed in the second pin body 420 and is disposed at the axis center O.

The rod hole 424 passes through the second pin body 420 and is connected to the head space 480 .

The piston head 473 may have a cylindrical shape, and the head space 480 may also have a cylindrical shape.

When the piston head 473 adheres to the right side of the head space 480 and moves to the right, the first ferromagnetic material 450 and the second ferromagnetic material 460 may be brought into close contact with each other.

When the piston head 473 adheres to the left side of the head space 480 and moves to the left, the first ferromagnetic body 450 and the second ferromagnetic body 460 are separated by a predetermined distance, and the elastic force of the elastic member 440 As a result, the runner pin 401 can be injected at high speed.

Since the left and right lengths of the head space 480 are longer than the left and right lengths of the piston head 473, the injection speed of the runner pin 401 is not limited by the moving speed of the piston head 473.

The movable mold 2 is disposed on the side of the fixed mold 1 based on the movable mounting plate 500 and the movable mounting plate 500, and is installed in close contact with the movable mounting plate 500. a movable side template 600, a core 610 disposed on the movable side template 600 and protruding toward the stationary side template 200, and the movable side template 600 and the stationary side template 200 and an ejection plate 700 disposed therebetween and penetrated by the core 610.

The fixed mold 1 of the three-step injection mold according to the present embodiment includes a fixed-side mounting plate 100, a fixed-side template 200, and a stripper plate 300.

The fixed-side template 200 adheres to the core 610 to mold the molded product MP. A cavity 210 for molding the molded product MP is formed in the center of the fixed side template 200, the core 610 is inserted into the cavity 210, and the gap between the cavity 210 and the core 610 is formed. The molded article MP is molded by the space.

Guide pin bushes B1 through which guide pins GP pass are disposed on each of the fixed side template 200 and the stripper plate 300.

The stripper plate 300 is disposed between the fixed-side template 200 and the fixed-side installation plate 100, and takes out the molded product MP.

One side of the stripper plate 300 (the left side in contact with the fixed side template 200) is in close contact with the right side of the runner injection molding product RP during mold opening of the fixed side template 200.

Sliding grooves 310 are formed through the stripper plate 300 in the left and right directions (moving direction of the fixed side template 200), and the sliding grooves 310 guide the sliding of the first runner pin 401 .

The upper portion of the stripper plate 300 is provided with a guide pin bush (B1) to guide the movement of the guide pin (GP).

The movable mold 2 of the three-stage injection mold includes a movable side mounting plate 500, a movable side template 600, and an eject plate 700.

The movable mounting plate 500 is a plate fixed to the left side of the injection mold so as to be movable in the left and right directions, and an eject pin bush B2 is provided on the lower side of each of the movable mounting plate 500 and the movable side template 600. This guides the movement of the eject pin 710 protruding from the eject plate 700 toward the movable side template 600.

The movable side template 600 is a template on the movable side among the templates forming a space for molding the molded product MP, and the movable side template 600 is provided with a core 610 and forms an inner surface of the molded product MP. And, the guide pin bush (B1) is provided on the upper side to guide the movement of the guide pin (GP).

The eject plate 700 is in close contact with the movable platen 600 to mold the molded product MP, and is moved to the right so as to be separated from the movable platen 600 by the eject pin 710 to take out the molded product MP. will make

Referring to FIG. 10 , molten resin is injected into the sprue 110 and sent between the cavity 210 and the core 610 through the runner 220 and the gate 230 to form the molded product MP.

Referring to FIG. 11, the first mold opening is performed by moving the fixed-side template 200 to the left so that the fixed-side template 200 moves away from the stripper plate 300.

Referring to FIG. 12, the second mold opening is performed by moving the stripper plate 300 in the left direction.

During the secondary mold opening of the stripper plate 300, the actuator 700 is operated to separate the first ferromagnetic body 450 and the second ferromagnetic body 460 by a predetermined distance or more, and the runner pin ( 401) is ejected from the first runner hole 310.

In addition, the runner injection material RP, which is in close contact with the stripper plate 300 by the injected runner pin 401, is separated from the stripper plate 300 and then falls downward due to its own weight.

Referring to FIG. 13 , when the movable mounting plate 500 and the movable side platen 600 are moved to the left and the third mold is opened, the molded product MP molded between the cavity 210 and the core 610 is the core. 610 to remain molded.

Referring to FIG. 14 , when the eject plate 700 is pushed through the operation of the eject pin 710, the eject plate 700 is separated from the movable side template 600, and thus the molded product MP maintained in the core 610 It is taken out and falls down by its own weight.

As such, in the injection mold according to the present embodiment, the runner pin 401 is injected at a high speed by the elastic member 440 during the second mold opening of the stripper plate 300, and the runner injection molding material (RP) is formed by the injection force. It can hit, and the runner injection molding material (RP) in close contact with the stripper plate 300 can fall downward due to its own weight after being spaced apart from the stripper plate 300.

15 is an enlarged view of a runner separation assembly according to a second embodiment of the present invention.

In the runner pin 401 of the runner separation assembly 400 according to the present embodiment, a fixing pin 490 capable of forcibly fixing the runner injection molding material RP is further disposed.

The fixing pin 490 is disposed on the first pin body 410 . In particular, the fixing pin 490 has a striking surface 411 in contact with the first pin body 410 and the runner injection molding product RP.

The fixing pin 490 protrudes from the striking surface 411 toward the gate 230 and may be disposed at the same height as the gate 230 .

The fixing pin 490 may have a hook shape capable of engaging and fixing the runner injection molding material RP.

The fixing pin 490 is disposed on the axis center line O, and may be partially inserted into the runner 220 or the gate 230 side. When the fixing pin 490 is inserted, the amount of resin used can be reduced by reducing the volume of the runner injection molding material RP.

In this embodiment, the fixing pin 490 is formed in the shape of an arrowhead and may be composed of a sharp protruding part (reference symbol not shown) in the center and a hook hook formed around the protruding part.

When the runner injection molding product RP is formed, the fixing pin 490 is disposed inside the runner injection molding product RP.

In the first mold opening, the runner injection molding (RP) is generally in close contact with the stripper plate 300, but in a specific situation, the runner injection molding (RP) may be moved to the left side together with the fixed side template (200).

When the runner injection molding material RP is moved to the left side together with the fixed side template 200, the fixing pin 490 causes defects in subsequent processes due to malfunction and requires repair by a worker.

The fixing pin 490 interlocks with the runner injection molding material RP so that the runner injection molding material RP does not move to the left along with the fixed-side template 200, and the runner injection molding material RP is stripped during the first mold opening. Since it can be forcibly left on the plate 300, the molded article MP is stably molded, and it is easy to stably remove the runner injection molding product RP.

In one embodiment, the hook engaging portion may be fixed to the protruding portion by fitting into a groove formed along an outer circumferential surface of the protruding portion in a direction parallel to the protruding direction of the protruding portion. That is, since the hook engaging portion is fitted in a direction parallel to the protruding direction, when an impact is received in a direction parallel to the protruding direction of the protruding portion, it may be separated from the protruding portion by being separated from the groove formed along the outer circumferential surface of the protruding portion.

Therefore, even if the fixing pin 490 forms mutual interlocking with the runner injection molding material RP, since the runner injection molding material RP is minimally caught only to the extent that it can remain on one side of the stripper plate 300, the runner injection molding material RP ) It is easy to separate later from the fixing pin 490.

Since the rest of the configuration is the same as that of the first embodiment, a detailed description thereof will be omitted.

In the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, but should be defined by not only the scope of the claims to be described later, but also those equivalent to the scope of these claims.

801: compressor 802: electronic expansion valve
803: accumulator 804: first pump
805: second pump 807: first flow control valve
808: second flow control valve 810: first tank
811: first heat exchanger 820: second tank
821: second heat exchanger 831: first tank suction port
832: first tank discharge port 833: second tank suction port
834: second tank discharge port 841: first mold discharge port
842: first mold recovery port 843: second mold discharge port
844: second mold recovery port 881: first temperature sensor
882: second temperature sensor 883: third temperature sensor
884: fourth temperature sensor 885: core temperature sensor
886: cavity temperature sensor

Claims (1)

An injection mold supporting cooling using two cooling waters having different temperatures,
a fixed mold (1) and a movable mold (2);
a runner separation assembly 400 separating the runner injection molding material RP formed in the fixed mold 1; and
A cooling device 800 circulating first cooling water and second cooling water having different temperatures in at least one of the stationary mold 1 and the movable mold 2,
The cooling device 800,
a first tank 810 in which the first cooling water is stored;
a second tank 820 in which second cooling water having a temperature relatively lower than that of the first cooling water is stored;
a first heat exchanger 811 disposed inside the first tank 810 and exchanging heat between the first cooling water and the refrigerant;
a second heat exchanger 821 disposed inside the second tank 820 and exchanging heat between the second cooling water and the refrigerant;
Compressor 801 for compressing the refrigerant;
a first refrigerant pipe 851 connecting the compressor 801 and the first heat exchanger 811;
a second refrigerant pipe 852 connecting the first heat exchanger 811 and the second heat exchanger 821;
a third refrigerant pipe 853 connecting the second heat exchanger 821 and the compressor 801;
an electronic expansion valve 802 disposed in the second refrigerant pipe 852 and expanding the refrigerant flowing from the first heat exchanger 811 to the second heat exchanger 821;
It is disposed in the third refrigerant pipe 853, receives the refrigerant flowing from the second heat exchanger 821 to the compressor 801, separates the liquid refrigerant from the gaseous refrigerant, and transfers the separated gaseous refrigerant to the compressor ( an accumulator 803 provided to 801); and
A control unit 895 for controlling the operation of the compressor 801, the electronic expansion valve 802, and the accumulator 803 according to the cooling cycle; includes,
The fixed mold 1,
a fixed-side mounting plate 100 having a sprue 110;
a fixed side template 200 disposed on the side of the movable mold 2 based on the fixed side installation plate 100 and having a cavity 210;
A stripper plate 300 disposed between the fixed-side template 200 and the fixed-side installation plate 100, and to which one surface of the runner injection molding material RP is in close contact during injection; includes,
The movable mold 2,
movable side mounting plate 500;
a movable side template 600 disposed on the side of the fixed mold 1 with respect to the movable side mounting plate 500 and installed in close contact with the movable side mounting plate 500;
a core 610 disposed on the movable side template 600 and protruding toward the fixed side template 200;
An ejection plate disposed between the movable side template 600 and the fixed side template 200, penetrated by the core 610, and disposed between the fixed side template 200 and the movable side template 600 ( 700); including,
The runner separation assembly 400,
It is disposed to pass through the stripper plate 300 and is fixed to the fixed side installation plate 100 through attraction by magnetic force. When the attraction by magnetic force is released, the elastic force of the elastic member 440 causes the fixed side template It includes a runner pin 401 protruding to the side of (200),
The controller 895 supplies the first cooling water or the second cooling water to the fixed mold 1 according to the temperature of the core temperature sensor 885 disposed on the core 610, having different temperatures. Injection mold supporting cooling with two coolants.

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