KR20060052155A - Mold system for molding comprising halogen lamp and molding method using the same - Google Patents

Abstract

The present invention relates to a molding die system having a halogen lamp and a molding method using the same. In particular, the present invention is a molding mold system for producing a molding agent through a cavity formed on the mating surface between the molds, the heat medium flow path and the heat medium flow path which can be inflow or outflow at a predetermined interval from the cavity surface and the constant back to the upper portion of the heat medium flow path Manufacturing a mold system for molding with a halogen lamp, characterized in that it comprises a mold having a hollow lamp mounting portion to enable the mounting of the halogen lamp at intervals and a halogen lamp coupled to the lamp mounting portion and the production of a molded article using the same It relates to a molding method for.

Through the present invention, it is easy to control the temperature of the cavity surface of the mold to reduce the deformation and surface defects of the product, in particular, it is possible to reduce the separate reprocessing process for the joint line by inhibiting the generation of the joint line. In addition, by reducing the heating and cooling time to shorten the switching time to obtain the effect of improving productivity, there is an advantage that can be efficiently managed energy.

Halogen Lamp, Mold, Forming Method

Description

Mold system for molding with halogen lamp and molding method using the same {MOLD SYSTEM FOR MOLDING COMPRISING HALOGEN LAMP AND MOLDING METHOD USING THE SAME}

1 is a cross-sectional view of one embodiment of a mold applied to a molding die system with a halogen lamp of the present invention.

2 is an enlarged cross-sectional view of a halogen lamp portion of another embodiment of a mold applied to a molding die system having a halogen lamp of the present invention.

3 is an enlarged cross-sectional view of a halogen lamp portion of another embodiment of a mold applied to a molding die system having a halogen lamp of the present invention.

4 is an overall system schematic of one embodiment of a molding die system with a halogen lamp of the present invention.

5 is a schematic view of an embodiment of a heating unit applied to a heat medium temperature control device applied to a molding die system having a halogen lamp of the present invention.

Description of the main symbols in the drawings

10 mold 11: upper disc mold

12: upper core mold 13: lamp mounting portion

14: heat medium flow path 15: heat insulation groove

16: insulation material 18: constant cooling line

21: lower disc mold 22: lower core mold

23: cavity 30: halogen lamp

31: reflector 40: heating portion

41: halogen lamp for heating the heating medium

42: heat transfer pipe

The present invention relates to a molding die system having a halogen lamp and a molding method using the same, and in particular, to facilitate the temperature control of the surface of the cavity in which the actual molding of the mold is manufactured, it is possible to optimize the temperature control at the time of injection of resin, It is possible to reduce the deformation of the product or the surface defects (FLOW MARK), to suppress the generation of the welding line (WELD LINE) among the defects, eliminating the separate reprocessing process performed at the time of the welding line, and also to reduce the heating and cooling time The present invention relates to a molding die system having a halogen lamp and a molding method using the same, which can improve productivity by shortening a cycle time and reducing energy.

In general, when the thermoplastic resin is molded by injection molding or compression molding, the temperature of the surface of the cavity in which the melt is actually filled is important. When the temperature of the cavity surface is not appropriate, deformation of the molding or surface defects may occur. There is a problem. In addition, in order to control the temperature of the mold, the mold should be heated and cooled according to the injection and solidification stages of the melt, and if such repeated cycles leading to heating-> cooling-> heating are not made quickly, it is manufactured in the production of moldings. There is a problem that the productivity decreases as time increases. In addition, when the heating and cooling of the mold is performed for the entire mold, energy efficiency decreases due to unnecessary heating and cooling of the mold.

Therefore, in order to solve this problem, only the cavity surface of the mold is heated outside, and a hot air, an electric heater, steam, or a halogen lamp is directly applied to, or combined with, or irradiated to the exposed cavity surface when the mold is opened. And Japanese Patent Publication No. 1973-22020, Japanese Patent Publication No. 1976-22759, Japanese Patent Publication No. 1982-165229, Japanese Patent Publication No. 1989-42217 and Korean Patent Application No. 1996-3216. . However, in the case of forming a heating device separate from the mold, there is a problem in that the heating capacity is poor and the thermal efficiency is poor. In particular, in the case of applying an electric heater or a halogen lamp, the device becomes complicated, and the time for entering and exiting the heating device is increased. This takes a problem that the process time is long.

In order to solve this problem, a method of controlling the temperature of the cavity surface of the mold by forming a flow path in the mold and introducing a heating medium such as steam, hot water or thermal oil and a cooling medium independently or alternately on the flow path is Japan. Patent Application Publication No. 1981-55219. However, in the case of heating and cooling through the heat medium, since heating and cooling are made by simple heat conduction, there is no directivity in heat transfer, so heating and cooling are not concentrated on the surface of the cavity, and heating and cooling isotropically centered on the flow path. Since the outer part of the mold is heated and cooled in the same way, the response time is decreased, so the switching time is increased, and thus the productivity decreases.Therefore, since the object of heating and cooling is made for the entire mold, the cycle progresses during molding. There is a problem in that energy efficiency is lowered.

In order to solve the problems of the prior art as described above, the present invention allows the object of heating and cooling to be concentrated on the surface of the cavity in which the actual molding inside the mold is manufactured, and such a heating / cooling device may be installed in the mold to increase thermal efficiency. It is an object of the present invention to provide a molding die system having a halogen lamp and a molding method using the same, which can easily control the temperature thereof and omit a process such as installation and removal of a heating and cooling unit.

It is another object of the present invention to provide a mold system for forming a mold having a halogen lamp and a molding method using the same, by which heating and cooling are concentrated on the surface of the cavity, thereby improving the responsiveness of the surface temperature of the cavity and improving productivity. .

In addition, the present invention can quickly and accurately control the temperature of the cavity surface to reduce the deformation and surface defects of the molded product, and to suppress the occurrence of the bond line even in the defects to eliminate the separate reprocessing process performed at the time of the bond line generation An object of the present invention is to provide a molding die system having a lamp and a molding method using the same.

The present invention to achieve the above object

In a molding die system for producing a molding agent through a cavity formed on the mating surface between the molds,

A mold having a heat medium flow path capable of inflow or outflow of a heat medium at a predetermined distance from the cavity surface, and a hollow lamp mounting part allowing a halogen lamp to be mounted at a predetermined distance from the top of the heat medium flow path again; And

It provides a molding die system having a halogen lamp, characterized in that it comprises a halogen lamp coupled to the lamp mounting portion.

In addition, the present invention

It provides a molding method using a molding mold system having a halogen lamp, characterized in that using the molding mold system.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die system having a halogen lamp, wherein the molding die system produces a molding agent through a cavity 23 formed on a joining surface between the molds 10, wherein the molding die system has a predetermined distance from the surface of the cavity 23. The mold and the lamp having a heat medium flow path 14 capable of inflow or outflow of the heat medium and a hollow lamp mounting portion 13 to allow the halogen lamp 30 to be mounted at a predetermined interval back to an upper portion of the heat medium flow path. It comprises a halogen lamp (30) coupled to the mounting portion (13).

Hereinafter, a molding die system having a halogen lamp of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of an embodiment of a molding die system with a halogen lamp according to the present invention.

The present invention relates to a mold system including a molding die for producing a molded article through a cavity 23 formed on a joining surface between molds used for manufacturing a molding by injecting various melts including a thermoplastic resin into a mold. It includes not only resin but also various molding materials.

In general, in molding through a mold, the mold is heated to a predetermined temperature in the injection step in order to facilitate the injection of the melt. In this case, it is the surface temperature of the cavity 23 that actually determines the degree of injection of the melt. In addition, in the cooling step of the molding, surface defects including deformation of the weld line (Weld Line) or the deformation of the product occur according to the temperature of the surface of the cavity 23, and thus control is required. Therefore, in the present invention, the heat medium flow path 14 capable of inflow or outflow of the heat medium by a predetermined distance from the surface of the mold-like cavity 23 in the mold is spaced a predetermined distance back to the upper portion of the heat medium flow path, so that the mounting of the halogen lamp 30 is possible. It is configured to have a hollow lamp mounting portion 13 to enable.

As shown in FIG. 1, the heat medium flow passage 14 is spaced apart from the surface of the cavity 23 toward the inside of the mold by a predetermined distance and is installed in the mold 10, and is formed as close to the surface of the cavity 23 as possible. 23) It is easy to control the temperature of the surface, but if it is too close, it is disadvantageous in terms of the strength of the mold, and preferably 1 to 10 mm away from the surface of the cavity 23 of the mold. More preferably, the separation distance may be changed according to the diameter of the flow path, and when the effective diameter of the flow path is 2 to 4 mm, the separation distance may be 1 to 5 mm.

The heat medium flow path 14 is preferably configured such that the heat medium flows inwardly, ii) outflow or iii) inflow and outflow of the mold close to the cavity surface, as shown in FIG. 1. It can also be installed in the lower mold, or installed only in the upper or lower mold.

As the heat medium used in the heat medium flow path 14, various known heat mediums including steam, hot water, heat medium oil, organic heat medium, inorganic heat medium, or a known cooling medium including a refrigerant, cooling water, and the like may be used. In consideration of the ease of use, the use temperature range and the ease of purchase, mineral oil-based heat transfer oil or synthetic heat transfer oil is preferably used. In the molding process, by controlling the temperature and flow rate of the heat medium flowing into or out of the heat medium flow path, the cavity surface temperature of the mold is raised or lowered to control the cavity surface temperature at which the molded product is smoothly manufactured.

In addition, preferably, during heating by lighting the halogen lamp, the heating medium stops the circulation, cuts off the supply, or removes all from the flow path to reduce the cooling caused by the circulation of the heating medium, so that the heating efficiency may be improved. In other words, all heating methods using heating media such as steam, hot water, thermal oil, organic materials, and inorganic materials are indirect heating methods. This will drop a lot, and because the heat flows, the mold cannot absorb 100% of the heat. Therefore, the longer the cycle time, the higher the cost, and the longer the heating line or the large area of the cavity surface, the temperature of the cavity surface may be partially uneven, which may result in deterioration in quality. Therefore, in order to install heat directly inside the mold by using a halogen lamp and to reduce the heat transfer when the temperature of the mold is increased by using a halogen lamp, the heating of the indirect heating medium is performed in 1) the mold of the heating medium without the halogen lamp. Heats only up to the temperature of the output part, and 2) stops heating through the heating medium, or blows the heating medium in the heat medium flow path into the air and maintains the stopped state. This is to shorten the time during heating and not to dissipate the heat of the halogen lamp into the heat medium (in some cases, it is possible to operate only the cooling without the indirect heating). To be absorbed.

In particular, since the use temperature of the heat medium oil can be used in the range of -20 to 350 ℃ can be easily applied to the temperature control around 130 to 160 ℃, which is the mold temperature required to remove the surface defects, such as the joint line in particular Can be. Specific examples thereof include alkylbenzene-based or naphthenic-based heat medium oils, which in this case have advantageous properties in terms of viscosity and volatility.

In addition, the mold used in the mold system of the present invention has a hollow lamp mounting portion 13 in the mold 10 for installing the halogen lamp 30 at regular intervals back to the upper portion of the heat medium passage 14. This is located above the heat medium flow path 14 as shown in Figure 1 and serves as a heating unit. The lamp mounting portion 13 is located above the heat medium flow path 14, and through this positional relationship, it is possible to more precisely and quickly control the temperature of the surface of the cavity 23. The distance of the predetermined interval may be configured in various forms according to the irradiation direction of the halogen lamp 30, the temperature distribution requirements in the mold, the installation interval of the halogen lamp 30, the amount of heat generated.

The lamp mounting portion 13 may be installed in the upper molds 11 and 12, the lower molds 21 and 22, and the upper and lower molds 10, respectively, similarly to the heat medium passage 14.

Halogen lamps 30 are mounted on the lamp mounting units 13, respectively, which serve to heat the mold 10. By using the halogen lamp 30 as the heating portion, the halogen lamp has a fast heating rate of 100 to 500 ° C. per second, thereby improving the temperature response of the mold.

In addition, in the case of the halogen lamp 30, since heat transfer is performed by radiation rather than heat transfer by conduction, the direction of heat transfer can be adjusted in a certain direction, so that heating to the surface of the cavity 23 can be concentrated to increase heat efficiency. It has the advantage of improving the quick response characteristics. Therefore, in order to increase this characteristic, the halogen lamp 30 may be configured to further include a reflector 31 for adjusting the lamp light irradiation direction in a predetermined direction, as shown in Figure 2, the direction of the cavity surface It is preferable to set it as the direction.

In addition, the mold of the present invention may be configured in the form of a mold consisting of the upper mold (11, 12) and the lower mold (21, 22) or the left mold and the right mold, the heating / cooling at the time of heating and cooling the mold In order to relatively reduce the volume of the target mold, the upper and lower molds are divided into disc molds 11 and 21 and core molds 12 and 22, respectively, as shown in FIG. In order to minimize heat transfer between the 11 and 21 and the core molds 12 and 22, it is preferable to apply the heat insulating material 16 or the heat insulating groove 15 therebetween.

More preferably, as shown in FIG. 1, the mold is divided into disc molds 11 and 21 and core molds 12 and 22, and the heat medium flow passage 14 and the lamp mounting portion 13 are disposed in the core molds 12 and 22. It may be configured to couple the halogen lamp 30 to the lamp mounting portion 13, the upper end of the core mold (12, 22) insulated grooves open to the contact surface of the disc mold (11, 21) (15) is further included, and the contact surfaces between the disc molds (11, 21) and the core molds (12, 22) can be configured to further include a heat insulating material (16). Through this, the heat emitted from the heating part made of the halogen lamp 30 may be insulated by the air of the heat insulating groove 16 on the side, and the heat may be insulated by the heat insulating material 15 on the upper side.

In addition, as shown in FIG. 3, it is preferable that the lamp mounting portion 13 constitutes an opening so that a part of the lamp mounting portion 13 is opened to the upper surfaces of the core molds 12 and 22. That is, during rapid heating of the halogen lamp 30, the thermal shock to the mold 10 and the halogen lamp 30 due to the instantaneous heating in the narrow space of the lamp mounting part 13 can be alleviated through the space of the opening. have.

In addition to the technology applied in the general mold as shown in FIG. 1, the upper and lower parts 11 and 21 of the disc mold can be always installed around the core mold (12, 22) cooling line 18, The side surface between the core molds 12 and 22 and the disc molds 11 and 21 may also be configured to further include a heat insulating material 16 on the disc mold side. Through this, it is possible to improve the impact relaxation and fitting characteristics of the mold according to the heating and cooling cycle.

An overall system schematic of one embodiment of the mold system of the present invention including the configuration of the mold and halogen lamp described above is shown in FIG. 4. As shown, a molding die system having a halogen lamp according to the present invention includes a heat medium temperature control device for heating or cooling a heat medium supplied to the heat medium flow path in addition to the mold and the halogen lamp to provide a heat medium of a desired temperature. A heat medium supply device including the heat medium temperature control device and supplying a heat medium of a predetermined temperature to the heat medium flow path 14 by the heat medium temperature control device, a power supply device connected to the halogen lamp 30 to supply power thereto; It is connected to the temperature measuring device which is buried near the surface of the cavity 23 of the mold to measure the temperature, and connected to the temperature measuring device, the power supply and the heat medium supply device to supply the power supply and the heat medium to the temperature of the cavity surface according to the molding cycle. It may be configured to further include a temperature control unit for controlling and adjusting the device.

The heat medium temperature control device may store the heat medium and the cooled heat medium heated to a predetermined temperature through a heating unit and a cooling unit, respectively, at a predetermined temperature and provide a mixture according to the required temperature, and the heating medium 40 at room temperature or cooled. Alternatively, various forms such as heating or cooling may be applied by means of instantaneous heating or instant cooling through the cooling unit. In addition, various well-known types of cold and hot heat medium production apparatus and cold and hot water dispensers may be applied.

In the case of the instantaneous heating, as shown in an embodiment of FIG. 5, the heat medium heating halogen lamp 41 and the heat medium heating halogen lamp 41 are spaced apart at regular intervals and spirally wrapped therein, and the heat medium flow path ( It is also possible to comprise a heat medium temperature control device including a heating portion 40 consisting of a heat medium transfer pipe 42 connected to 14). This maximizes the response characteristics by using the instantaneous heating characteristics of the halogen lamp, there is no need to store a separate high temperature heat medium oil has the advantage of improving the thermal efficiency characteristics and to ensure safety by preventing safety accidents in advance.

In addition, a specific example of the temperature measuring device may be a thermocouple embedded in a mold near the cavity surface.

The present invention also provides a molding method using a molding die system having a halogen lamp, characterized in that the molding die system described above is used. Through this, molding is performed while controlling the temperature of the cavity surface to an appropriate temperature according to each molding process step.

In particular, the heat medium flow passage 14 may alternately repeatedly flow the cooled heat medium and the heated heat medium according to each molding process step, and only the cooled heat medium flows into a certain portion of the heat medium flow paths, and The molding process may be performed while controlling the surface temperature of the cavity while introducing only the heated heating medium.

Through the mold system for molding having a halogen lamp of the present invention and a molding method using the same, the heating and cooling targets can be concentrated on the surface of the cavity in which the actual molding inside the mold is manufactured, thereby improving thermal efficiency. Particularly, when halogen lamp is applied, heat transfer by radiation causes direct heat transfer, which not only improves thermal efficiency, but also enables instantaneous heating, improves response and facilitates temperature control of cavity surface. And since the process such as removal can be omitted, the switching time is shortened to improve the productivity while maintaining the quality level of productivity.

In addition, through the present invention, heating and cooling are concentrated on the cavity surface, and by controlling the temperature of the cavity surface quickly and accurately, it is possible to reduce the surface defects including deformation of the molded product or the joint line, and in particular, when the generation of the joint line is suppressed by preventing the occurrence of the joint line. There is an effect that can eliminate the separate reprocessing process performed in the lower the manufacturing cost and improve the productivity.

In addition, by applying the halogen lamp to the heat medium thermostat together to form the whole system, the high responsiveness can be obtained by receiving the high temperature heat medium in a shorter time, and the storage tank of the high temperature heat medium can be eliminated. The device can be configured and there is an advantage to prevent the safety accidents that may occur from the removal of the high temperature storage tank.

In addition, there is an advantage that can reduce the maintenance cost to 1/10 compared to the general method using only the heat medium.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various modifications of those skilled in the art without departing from the spirit and scope of the present invention described in the claims below. And modifications are also included within the scope of the invention.

Claims (9)

In a molding die system for producing a molding agent through a cavity formed on the mating surface between the molds, A mold having a heat medium flow path capable of inflow or outflow of a heat medium at a predetermined distance from the cavity surface, and a hollow lamp mounting part allowing a halogen lamp to be mounted at a predetermined distance from the top of the heat medium flow path again; And Molding system with a halogen lamp, characterized in that it comprises a halogen lamp coupled to the lamp mounting portion. The method of claim 1, The heat medium flowing into or out of the heat medium flow path is a heating medium made of one of hot water, steam, mineral oil-based heat medium or synthetic heat oil, or a cooling medium made of one of a coolant and a cooling water. . The method of claim 1, The halogen lamp is a mold system for molding with a halogen lamp, characterized in that it further comprises a reflector for adjusting the lamp light irradiation direction. The method of claim 1, The mold is a core mold coupled to the inside of the disc mold, the upper end of the core mold further comprises a heat insulating groove opened to the contact surface of the disc mold, the lamp mounting portion is partially opened to the upper surface of the core mold, Molding system with a halogen lamp, characterized in that the contact surface between the disc mold and the core mold further comprises a heat insulating material. The method of claim 1, And a heat medium temperature control device including a heating part comprising a heat medium heating halogen lamp and a heat medium heating tube spaced apart at a predetermined interval from the heat medium heating halogen lamp and spirally wrapping the heat medium conveying pipe connected to the heat medium flow path. Molding system for molding with lamp. The method of claim 5, A temperature measuring device embedded near the cavity surface of the mold; A heat medium supply device including the heat medium temperature control device and thereby supplying a heat medium of a predetermined temperature to the heat medium flow path; A power supply connected to the halogen lamp to supply power; And And a temperature control unit connected to the temperature measuring device, the power supply device, and the heat medium supply device to control the temperature of the cavity surface by controlling the power supply device and the heat medium supply device according to the molding cycle. Molding system for molding. A molding method using a molding die system with a halogen lamp, characterized in that the molding die system according to any one of claims 1 to 6 is used. The method of claim 7, wherein A molding method using a molding die system having a halogen lamp, characterized in that the cooled heat medium and the heated heat medium are repeatedly introduced into the heat medium flow path alternately. The method of claim 7, wherein Molding method using a molding die system having a halogen lamp, characterized in that only the cooled heat medium flows into the flow path of the predetermined portion of the heat medium flow path, and only the heated heat medium flows into the remaining flow path.

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