JP3013428U - Mold temperature control device - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a mold temperature control device capable of improving molding ability and contributing to obtaining a molded product having high commercial value without deterioration of mechanical performance. A mold temperature control device 1 of the present invention comprises a heating light source that emits near-infrared light in a housing, and a heating means 5 that radiates heat radiated from the heating light source from an end surface of the housing. Have,
The heating means 5 is made to face the molding end surface of the mold 6 in the mold open state, and the molding end surface region of the mold 6 is caused to radiate heat from the end surface of the heating means 5 so that an object to be molded by the mold 6 is exposed. It heats to a temperature close to the temperature.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a mold temperature control device, and more particularly, to a mold temperature control device suitable for application to a mold used for resin molding.

[Prior art]

 Conventionally, when resin molding is performed using a mold, a mold is provided with a flow path and hot water is caused to flow to keep the mold at a predetermined temperature by heat conduction. Inject fat. As a result, a molded product in the shape of a mold preformed on the mold is obtained. However, since the temperature of the mold is maintained at a predetermined temperature (for example, about 80 degrees Celsius), it will be described later depending on the type of resin. Various problems occur. The above-mentioned predetermined temperature of the mold is a temperature that is not optimum at the time of resin injection but ensures a minimum flow of resin, and is a temperature at which the resin is easily solidified at a minimum. The above is the outline of the mold temperature control that has been conventionally used when resin molding is performed using a mold.

[Problems to be solved by the device]

 However, in the case of the conventional mold temperature control as described above, the temperature of the molding resin (depending on the resin, for example, about 250 degrees Celsius) and the temperature of the mold (for example, about 80 degrees Celsius). Since the difference is large, the following problems occur. (1) When the resin for molding at high temperature comes into contact with the mold at low temperature, only the surface portion of this resin solidifies immediately, and this thin solidified layer is pulled by the flow and along the flow of resin on the surface of the molded product. Thin wrinkles occur. Therefore, the gloss of the surface of the molded product is lowered and the commercial value is significantly reduced. (2) In addition, the fluidity of the resin deteriorates, the resin temperature drops during the flow, and welds occur at the confluence of the resin flow, causing faults in the molded product, resulting in mechanical performance. Will lead to a decrease in Such a decrease in mechanical performance is particularly noticeable when a composite of glass fiber or carbon fiber and resin is used as a molded product or a molded product having a large wall thickness. As a countermeasure in this case, it may be considered to increase the injection pressure of the molded product, but if the residual pressure is unnecessarily generated in the molded product, other obstacles are also induced. (3) Further, regarding the resin cooling surface, the cooling time becomes long because the predetermined temperature of the mold is high, and the time of the entire molding cycle becomes long, resulting in a decrease in molding efficiency. Therefore, the present invention solves the above problems and provides a mold temperature control device capable of improving molding ability and contributing to obtain a molded product having high commercial value without deterioration of mechanical performance. With the goal.

[Means for Solving the Problems]

 The mold temperature control device according to claim 1 has a heating light source that emits near-infrared light in a housing, and has a heating unit that radiates heat radiated from the heating light source from an end surface of the housing, The heating means is made to face the molding end surface of the mold in the mold open state, and the molding end surface area of the mold is brought close to the temperature of the molding object by the radiant heat radiated from the end surface of the heating means. It is designed to be heated to the temperature. The mold temperature control device according to claim 2 has a heating light source that emits near-infrared light in a housing, and a heating unit that radiates heat radiated from the heating light source from an end surface of the housing, and an opening / closing mechanism. The mold comprises a flow path formed to pass through the vicinity of the molding end surface of the mold configured as possible, and a cooling means for flowing a cooling medium into this flow path to cool the molding end surface area of the mold. Radiation heat radiated from the end surface heats the molding end surface region of the mold in the mold open state to a temperature close to the temperature of the object to be molded by this mold, and after the molding of the object to be molded by the mold is completed, The cooling means cools the molding end face region of the mold to a temperature suitable for the next step. The mold temperature control device according to claim 3 has a heating light source that emits near-infrared light in a housing, and a heating means that radiates heat radiated from the heating light source from an end surface of the housing, and an opening / closing mechanism. A temperature detection element arranged inside the mold end face of the mold that is configured to be possible, a flow path formed so as to pass near the mold end face of the mold, and a cooling medium is caused to flow through this flow path to mold the mold. A cooling means for cooling the end face region, and a control means for controlling the insertion / extraction of the heating means to the molding end surface of the mold and heating, the operation control of the cooling means, the opening / closing control of the mold and the molding control. Based on the temperature detection result of the molding end surface area by the temperature detecting element, the control means inserts / extracts the heating means into / from the molding end surface, heats the molding end surface, opens / closes the mold and performs molding. Molding object, molding end face area of mold by the cooling means Cooling is obtained to perform a predetermined timing.

[Action]

 The operation of the mold temperature control device according to the present invention will be described below. According to the mold temperature control device of claim 1, the heating means containing the heating light source for emitting near infrared light is made to face the molding end surface of the mold in the mold open state, and from the end surface of the heating means. The molding end surface area of the mold is heated by the radiant heat from the emitted near infrared light to a temperature close to the temperature of the object to be molded by this mold. It is possible to perform molding in a state where the temperature of the object is close to the temperature of the object to be molded in a short time, which prevents the generation of thin skin and faults and eliminates wrinkles and faults on the surface. It is possible to obtain a molded product having excellent mechanical performance and high commercial value. According to the mold temperature control device of the second aspect, the heating means containing the heating light source for emitting near infrared light is made to face the molding end surface of the mold in the mold open state, and from the end surface of the heating means. It is possible to perform molding in a state where the temperature of the molding end surface region of the mold is brought close to the temperature of the molded object by this mold by the radiant heat from the radiated near infrared light in a short time, and After the molding of the object to be molded, the cooling means cools the molding end surface area of the mold to a temperature suitable for the next step, so that the molding cycle time can be shortened, and there are no wrinkles or faults on the surface. It is possible to obtain molded products with excellent commercial performance and high commercial value with high manufacturing efficiency. According to the mold temperature control device of claim 3, based on the temperature detection result of the molding end face region by the temperature detecting element arranged inside the molding end face of the mold, the control means determines the mold of the heating means. Since the insertion / removal of the molding end surface, the heating of the molding end surface, the opening / closing of the mold, the molding of the object to be molded, and the cooling of the molding end surface region of the mold by the cooling means are performed by predetermined timing, Rather than heating and cooling the entire mold, only the surface layer of the mold can be controlled, and there are no wrinkles or faults on the surface, and molded products with high mechanical value and high commercial value can be manufactured with high production efficiency. Moreover, it can be obtained automatically.

Embodiment Hereinafter, an embodiment of a mold temperature control device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows the overall structure of the mold temperature control apparatus 1 of the present embodiment. The mold temperature control apparatus 1 is equipped with a control means 2 for performing overall control, and is close to the control means 2. A heating light source that emits infrared light, that is, a halogen lamp 3 is built in a housing 4, and heating means 5 that radiates heat radiated from the halogen lamp 3 from an end surface of the housing 4 (see FIGS. 2 to 4). A driving unit 7 for inserting / removing and turning on / off, a temperature detecting element 8 disposed inside the molding end surface of a resin molding mold 6 configured to be openable / closable, and passing through the vicinity of the molding end surface of the mold 6. The cooling means 11 for constantly supplying cold water as a cooling medium to the flow paths 9a, 9b formed in such a configuration, the opening / closing drive section 12 of the mold 6 and the molding drive section 13 for injecting resin are connected. Here, the heating means 5 will be described in detail with reference to FIGS. The heating means 5 is made of aluminum and has a housing window portion 15a and is formed into a rectangular parallelepiped shape as a whole, a required number of halogen lamps 3 arranged in a row in the housing window portion 15a, With a terminal 16 for energization arranged on one side surface of the housing 15, a connection cable 17 for connecting the halogen lamp 3 and the terminal 16, and an arrangement around the required number of the halogen lamps 3 arranged in a row, Further, it is provided with a cooling pipe 18 led out to the same side surface as the terminal 16, a connecting member 19 connected to both ends of the cooling pipe 18, and a bolted protective net 20 for protecting the outside of the halogen lamp 3. are doing. Then, by flowing a cooling medium (for example, water) through the cooling pipe 18, the halogen lamp 3 and the connection cable 17 are prevented from overheating. As shown in FIG. 2, the heating means 5 configured as described above is joined back to back, and emits light in the infrared region from each end face toward the molding end faces of the fixed mold 6a and the moving mold 6b described later. It emits light and heats each molding end face to high temperature in a short time by temperature radiation. The heating means 5 may be constructed by joining two back to back as shown in FIG. 2 or may be constructed by one. As shown in FIG. 2, the mold 6 includes a fixed mold 6a that is fixedly arranged, and a movable mold 6b that is joined to or separated from the fixed mold 6a by being driven by the opening / closing drive unit 12. are doing. As shown in FIG. 5, the halogen lamp 3 has a filament coil 22 made of tungsten or the like and an anchor 23 arranged inside a cylindrical quartz glass envelope 21 so that the filament coil 22 is attached to both ends of the envelope 21. In addition to being connected to the bases 24 and 25 made of an electric contact material, the sealing body 21 has a structure in which an inert gas such as Ar and a gas 26 composed of a halogen compound are enclosed. Then, the thyristor is driven by the driving unit 7 and the lighting is driven by PID (proportional, integral, differential) control. Such a halogen lamp 3 emits light in the near-infrared region with a wavelength of about 1 μm at a high temperature of 2500 to 3000 ° C. by heating the filament coil 22 by energization to heat the object to be heated to a high temperature in a short time. Heat to. In this case, the conversion efficiency of electric energy to heat energy is 100%, the watt (W) density exceeds 100 W / cm ^2, and the object to be heated is heated to 1500 ° C. or higher. Further, the thermal radiation output becomes about 90% within 1 second after energization, and the full output can be obtained almost instantly. Furthermore, since the light from the halogen lamp 3 heats the object to be heated by temperature radiation, the object to be heated can be heated directly as compared with a heating source utilizing heat conduction or convection. In particular, since light in the near infrared region having a wavelength of about 1 μm is used, it is suitable for heating the mold 6 made of iron or the like. It is also possible to combine an anti-slope mirror such as a parabolic mirror, an ellipsoidal mirror, or a high-order curved mirror in order to increase the heating efficiency of the object to be heated by the halogen lamp 3. As shown in FIG. 6, the temperature detecting element 8 is a thermoelectric element arranged at a position about 2 mm inward from the molding end surface of the fixed mold 6a (similar to the moving mold 6b). It is composed of a pair (temperature sensor) and the like. Note that reference numerals 25a and 25b in FIG. 2 denote an inlet and an outlet forming the flow passage 9a, and reference numerals 26a and 26b denote an inlet and an outlet forming the flow passage 9b. Further, reference numeral 27 in FIG. 6 is an in-mold flow channel forming the flow channel 9a. Next, the operation of the mold temperature control device 1 having the above-described configuration will be described with reference to FIGS. 7 to 9. When resin molding is performed by the mold 6, melting is performed by driving by the molding drive unit 13 from the extruder on the fixed mold 6a side during mold clamping (mold closing) of the fixed mold 6a and the movable mold 6b. Further, resin of about 250 degrees Celsius is injected into the cavities 6c of the fixed mold 6a and the moving mold 6b, and when the resin is cured, the opening / closing drive unit 12 performs mold opening to take out the molded product. In the present embodiment, during the mold opening at the molding start stage described above, the pair of heating means is operated by the drive unit 7 operated by the control by the control means 2 based on the detection result of the temperature of the molding end surface by the temperature detection element 8. As shown in FIG. 2, each of the halogen lamps 3 is made to face each thyristor 5 by the drive unit 7 which is operated under the control of the control unit 2 and is made to face between the respective molding end surfaces of the fixed mold 6a and the movable mold 6b. By driving and PID (proportional, integral, derivative) control, for a short period of time such as 3 seconds, 5 seconds, 10 seconds, radiant heat by near infrared light is radiated to each molding end face. These surface regions are heated to 90 to 200 degrees Celsius, preferably to 100 to 140 degrees Celsius to approach the temperature of the resin. In this case, a heating completion temperature different from the injection start temperature by about 0.5 to ± 1.0 degrees Celsius is set, and heating by the heating means 5 is performed at the stage when the temperature detecting element 8 detects the heating completion temperature. To stop. After that, the driving unit 7 separates the pair of heating means 5 from between the molding end faces of the fixed mold 6a and the movable mold 6b to close the mold, and further, the temperature of the fixed mold 6a and the movable mold 6b is changed. The injection of the resin by the molding drive unit 13 is waited as an injection delay until the temperature drops to the injection temperature of the resin due to heat dissipation or heat conduction and the temperature detection element 8 detects the injection temperature. Then, based on the detection result of the injection temperature by the temperature detection element 8, the resin melted by the drive of the molding drive unit 13 is injected into the cavities 6c of the fixed mold 6a and the movable mold 6b under the control of the control means 2. . As a result, the end surface regions of the fixed mold 6a and the movable mold 6b temporarily rise to a temperature slightly higher than the temperature increase completion temperature due to the heat of the resin. At this stage, the cooling means 11 is operated under the control of the control means 2 based on the detection result of the temperature slightly higher than the temperature rise completion temperature by the temperature detection element 8, and the flow path 9a of the mold 6 is described. 9b to cool the mold and the molded product. Further, based on the detection result of the temperature of the molded product taken out by the temperature detecting element 8, the opening / closing drive unit 12 is operated to open the fixed mold 6a and the movable mold 6b to take out the molded product. With the above operation, one molding cycle is completed. As a result, the molding cycle time can be shortened, and there are no wrinkles or faults on the surface. Can be obtained at. Further, the temperature of the end surface regions of the fixed mold 6a and the movable mold 6b can be controlled within the range of about 0.5 to ± 1.0 degrees Celsius by the above-described operation. It is also possible to perform feedback control for the molding cycle of the next step on the basis of the temperature data and drive timing data of the one molding cycle of the previous step so that the molding operation is performed under more optimal conditions. FIG. 8 shows the relationship between the irradiation time of the halogen lamp 3 and changes with time of the end surface (surface) temperatures of the fixed mold 6a and the moving mold 6b. That is, in FIG. 8, the distance between the end surface of the mold 6 and the heating means (heater) 5 is set to 20 mm, 20 mm, and 40 mm, and the pre-irradiation temperature of the end surface of the mold 6 is 39 to 40 degrees Celsius, and 79 to 80 degrees Celsius. , 79 to 80 degrees Celsius. Further, FIG. 9 shows a case where the distance from the end face of the mold 6 is 20 mm or 40 mm, the irradiation time of the halogen lamp 3 is 10 seconds, and the resin is injected 5 seconds after the irradiation. In the case of the mold temperature control device 1 of this embodiment as described above, the irradiation efficiency of the halogen lamp 3 is very good, and the quality of the molded product can be improved and the molding cycle can be shortened. In addition, in the case of existing molds, the mold surface temperature cannot be raised, so the injection pressure of the resin is increased to increase the fluidity of the resin.However, if the injection pressure is increased, a large force of the mold body is generated. Therefore, the cooling pipe must be separated from the surface of the cavity. As a result, the cooling efficiency is deteriorated, the cooling time is increased, and one molding cycle is lengthened. However, according to the mold temperature control device 1 of this embodiment, the resin injection pressure can be lowered. Since the in-mold flow passage 27 can be provided near the surface of the bite 6c, the cooling efficiency can be improved. In the case of the existing mold, although not shown, it is possible to arrange an air shower on the end surface of the mold and blow cool air to enhance the cooling efficiency.

[Effect of device]

 According to the present invention described above, the following effects can be obtained. According to the invention described in claim 1, it becomes possible to perform the molding in a state where the temperature of the molding end surface region of the mold is brought close to the temperature of the molding target in a short time, and as a result, a thin skin or a breakage occurs. It is possible to provide a mold temperature control device capable of preventing a heat generation, and having no wrinkles or faults on the surface and obtaining a molded product having excellent mechanical performance and high commercial value. According to the second aspect of the invention, the molding cycle time can be shortened, the surface is free of wrinkles and faults, and a molded product having excellent mechanical performance and high commercial value can be obtained with high manufacturing efficiency. A possible mold temperature control device can be provided. According to the invention of claim 3, it is possible to control only the surface layer of the mold without heating or cooling the entire mold, and there is no wrinkle or fault on the surface, which is excellent in mechanical performance. It is possible to provide a mold temperature control device capable of automatically obtaining a molded product having a high commercial value with high manufacturing efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic view showing the arrangement state of the apparatus of the embodiment of the present invention in a mold.

FIG. 3 is a partial cutaway view of a heating means in an apparatus according to an embodiment of the present invention.

FIG. 4 is a partially cutaway sectional view of a heating means in an apparatus according to an embodiment of the present invention.

FIG. 5 is a schematic view showing an example of a halogen lamp used in the apparatus of the embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a fixed mold in an apparatus according to an embodiment of the present invention.

FIG. 7 is a graph showing a temperature change in one molding cycle in the apparatus of the embodiment of the present invention.

FIG. 8 is a table showing mold surface temperature data obtained by a halogen lamp in an apparatus according to an embodiment of the present invention.

FIG. 9 is a table showing experimental data for heating a mold by a halogen lamp in an apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold temperature control device 2 Control means 3 Halogen lamp 4 Housing 5 Heating means 6 Mold 6a Fixed mold 6b Moving mold 8 Temperature detection element 9a Flow path 9b Flow path 11 Cooling means

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[Procedure amendment]

[Submission date] July 19, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

FIG. 8 shows a halogen lamp in an apparatus according to an embodiment of the present invention .
Chart showing mold surface temperature rise data

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Figure 9

[Correction method] Change

[Correction content]

FIG. 9 shows a halogen lamp in an apparatus according to an embodiment of the present invention .
Chart showing mold heating experiment data by

Claims (3)

[Scope of utility model registration request] 1. A heating light source for emitting near-infrared light is incorporated in a housing, and a heating means for radiating heat radiated from the heating light source from an end face of the housing is provided, and the heating means is in a mold open state. Facing the molding end surface of the mold, and heating the molding end surface region of the mold to a temperature approaching the temperature of the object to be molded by the radiant heat emitted from the end surface of the heating means. Mold temperature control device characterized by. 2. A heating light source for emitting near-infrared light is incorporated in a housing, and heating means for radiating heat radiated from the heating light source from an end surface of the housing, and molding of a mold which can be opened and closed. A flow path formed to pass through the vicinity of the end surface, and a cooling means for flowing a cooling medium into the flow path to cool the molding end surface area of the mold, are provided by radiant heat radiated from the end surface of the heating means. The molding end surface area of the mold in the mold open state is heated to a temperature close to the temperature of the molding object by the mold, and after the molding of the molding object by the mold is finished, the molding end surface area of the mold by the cooling means. A mold temperature control device, characterized in that the mold is cooled to a temperature suitable for the next step. 3. A heating light source for emitting near-infrared light is built in a housing, heating means for radiating heat radiated from the heating light source from an end surface of the housing, and molding of a mold which can be opened and closed. A temperature detecting element disposed inside the end face, a flow channel formed in a configuration that passes near the molding end face of the mold, and cooling means for flowing a cooling medium into the flow channel to cool the molding end face region of the mold. ,
The heating end includes a control means for performing insertion / removal control and heating control on the molding end surface of the mold, operation control of the cooling means, opening / closing control of the mold, and molding control, and the molding end surface by the temperature detecting element. Based on the temperature detection result of the area, the control means inserts into and removes from the molding end surface of the mold of the heating means and heating to the molding end surface, opening and closing of the mold and molding of the molding object,
A mold temperature control device, wherein the molding end face region of the mold is cooled by the cooling means at a predetermined timing.