JP7194987B2 - Mold control device, mold control unit, mold and mold control method - Google Patents

Description

The present invention relates to a mold control device, a mold control unit, a mold, and a mold control method.

In a wide range of fields such as the automobile industry, the food industry, and the electric/electronic industry, molded articles formed by mixing multiple liquid resins are used. Injection molding, in which liquid resin is cured, can shorten the molding process and improve productivity.

In Patent Document 1, liquid resin is injected from a spool communicating with a cavity of a mold composed of a lower mold and an upper mold, and when the cavity is sufficiently filled with resin, the mold is heated to heat the resin. A method for producing electrical and electronic components by curing is disclosed.

JP 2018-2923 A

In injection molding as disclosed in Patent Document 1, generally two liquid resins are mixed at a constant ratio and thermally cured. A thermosetting resin undergoes a chemical reaction when heated, and the chemical reaction generates gas. In order to discharge the generated gas out of the cavity, it is conceivable to provide a gas venting gate in the mold.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a mold control device, a mold control unit, a mold, and a mold control method that can facilitate removal of gas generated in the cavity from the cavity. intended to

A mold control device according to the present invention is a mold control device that includes a mold and controls the state inside the mold, wherein the mold includes a first mold member made of a metal having no air permeability. and a second mold member made of an air-permeable metal or air-permeable ceramic that communicates with the cavity portion of the first mold member, and extends from a gate provided in the first mold member toward the injection direction. When the cavity is filled with resin, the first on-off valve provided in the fluid pipe communicating with the second mold member is opened. It has a control unit for controlling.

A mold control unit according to the present invention is a mold control unit that controls the state inside the mold, and is a signal indicating that the cavity of the first mold member made of a non-permeable metal is filled with resin. and a second mold member made of an air-permeable metal or an air-permeable ceramic that communicates with the cavity portion when the signal is obtained by the signal acquisition unit. and a control unit that controls the 1 on-off valve to be in an open state.

A mold according to the present invention comprises a first metal mold member having no air permeability, and a second mold member made of an air-permeable metal or air-permeable ceramic, communicating with the cavity portion of the first mold member. The second mold member is arranged at a position facing the gate in the injection direction from the gate provided on the first mold member.

A mold control method according to the present invention is a mold control method for controlling the state inside the mold, and is a signal indicating that the cavity of the first mold member made of a non-permeable metal is filled with resin. is acquired, and when the signal is acquired, a first on-off valve provided in a fluid pipe communicating with a second mold member that is made of an air permeable metal or an air permeable ceramic and communicates with the cavity is opened. Control.

According to the present invention, the gas generated in the cavity can be easily discharged from the cavity.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows an example of a structure of the metal mold|die control system of this Embodiment. FIG. 3 is a schematic diagram showing a first example of a configuration of a main part of a perspective view of the first mold member to which the second mold member according to the present embodiment is attached. FIG. 3 is a schematic diagram showing a first example of a main configuration of a side surface of a first mold member to which a second mold member according to the present embodiment is attached; FIG. 4 is a schematic diagram showing a first example of the main configuration of the front side of the first mold member to which the second mold member of the present embodiment is attached. 5 is a time chart showing an example of a mold control method by the mold control unit of the present embodiment; FIG. 4 is a schematic diagram showing an example of gas generated in a cavity portion during thermosetting of a liquid resin. FIG. 5 is a schematic diagram showing an example of a state when gas having a counter pressure is injected into the cavity. It is a schematic diagram which shows an example of the shape of the front side of a molded product. FIG. 5 is a schematic diagram showing a second example of a configuration of a main part of a perspective view of the first mold member to which the second mold member according to the present embodiment is attached. FIG. 11 is a schematic diagram showing a third example of a main part configuration of a perspective view of the first mold member to which the second mold member according to the present embodiment is attached. FIG. 5 is a schematic diagram showing another example of the shape of the cavity when viewed from the front; 4 is a flow chart showing an example of a processing procedure of the mold control system according to the embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on the drawings showing its embodiments. FIG. 1 is a schematic diagram showing an example of the configuration of a mold control system according to this embodiment. In addition to a mold control unit 80 and a mold 70 as mold control devices, the mold control system includes a high temperature temperature control device 10, a low temperature temperature control device 20, a molding machine 30, weighing and feeding devices 40 and 50, and a counter pressure supply device 60 .

The mold 70 communicates with the first mold members 71 and 73 made of metal without air permeability and the cavity portion 701 of the first mold member 71, and the second mold member 72 made of air permeable metal or air permeable ceramic. and The first mold members 71 and 73 are, for example, a fixed side (for example, the first mold member 71) fixed to the molding machine 30 and a movable side (for example, a It can be configured with the first mold member 73). In addition, the first mold member 71 may be the movable side, and the first mold member 73 may be the fixed side. The first mold member 71 is provided with a gate 702 through which liquid resin is injected into the cavity portion 701 .

Air-permeable metals are metal materials (including porous metals) with countless micropores and have air-permeability. In addition, the gas-permeable metal includes not only a case in which fine pores are provided in advance in a metal material, but also a case in which fine pores are formed by processing. The average diameter of pores (for example, several tens of μm) and the porosity can be appropriately set. The second mold member 72 is not limited to an air-permeable metal, and may be a sintered body (formed body) obtained by heat-treating and baking an inorganic compound such as a permeable ceramic. In addition, when the second mold member 72 is made of air-permeable metal, the surface of the air-permeable metal may be coated with air-permeable ceramic.

Since the first mold member 71 and the second mold member 72 are constructed in a fitting structure, the mounting or removal of the second mold member 72 is facilitated. For example, the second mold member 72 can be manufactured as a permeable porous mold by sintering metal powder with a laser beam using a metal 3D printer. The second mold member 72 may be manufactured by processing an air-permeable metal material. Details of the first mold member 71 and the second mold member 72 will be described later.

The weighing supply device 40 includes a tank 41, a pump (not shown), and the like. The weighing supply device 40 and the molding machine 30 are connected by a material supply pipe 44 , and the material supply pipe 44 is provided with an electromagnetic valve 43 and a pressure sensor 42 . A liquid resin (first resin) in the tank 41 is weighed and pumped to the molding machine 30 by a pump.

The weighing supply device 50 includes a tank 51, a pump (not shown), and the like. The weighing supply device 50 and the molding machine 30 are connected by a material supply pipe 54 , and the material supply pipe 54 is provided with an electromagnetic valve 53 and a pressure sensor 52 . The liquid resin (second resin) in the tank 51 is weighed and pumped to the molding machine 30 by a pump. The first resin and the second resin are weighed and pumped to the molding machine 30 so as to obtain the required mixing ratio. Although not shown, the material supply pipes 44 and 54 may be combined into one pipe and connected to the molding machine 30, and the pipe may be provided with a static mixer to mix the resin. The resins supplied from the metering and feeding devices 40 and 50 can be thermosetting resins such as silicone resins, urethane resins, and epoxy resins.

The molding machine 30 includes a barrel 33, a screw 31, and the like. The mixture is mixed and injected into the mold 70 from the tip of the nozzle by the pressure in the barrel 33 (injection pressure). A backflow prevention valve 32 is provided at the tip of the nozzle.

The counterpressure supply device 60 includes a gas pump 61, a tank 62, a gas compressor (not shown), and the like. The tank 62 contains any one of inert gases including air, nitrogen gas, carbon dioxide gas, and argon gas. A fluid line 66 is connected between the counter pressure supply device 60 and the second mold member 72 . A fluid pipe 66 between the counter pressure supply device 60 and the second mold member 72 is provided with a counter valve 63 (electromagnetic valve) as a second on-off valve and a pressure sensor 65 . Further, the fluid pipe 66 branches midway and is connected to an exhaust port via an exhaust valve 64 (electromagnetic valve) as a first on-off valve. The counter pressure supply device 60 can supply gas having counter pressure to the cavity portion 701 through the fluid pipe 66 and the second mold member 72 . The counter pressure can be, for example, equal to or higher than the gas pressure in the cavity 701 and lower than the injection pressure. The gas in the cavity portion 701 is gas generated by a chemical reaction during thermosetting of the liquid resin. The exhaust valve 64 and the opposing valve 63 can be replaced with, for example, one switching valve.

A medium feed pipe 13 and a medium return pipe 23 are connected to each of the first mold members 71 and 73 . The medium transfer pipe 13 further branches midway, one of the branched medium transfer pipes 13 is connected to the high temperature temperature control device 10 via an electromagnetic valve 11, and the other branched medium transfer pipe 13 is connected to an electromagnetic valve 21 to a low-temperature temperature control device 20 . In addition, the return medium pipe 23 is further branched in the middle, one of the branched medium return pipes 23 is connected to the high temperature temperature control device 10 via the electromagnetic valve 12, and the other branched medium return pipe 23 is It is connected to a low temperature temperature control device 20 via an electromagnetic valve 22 . Further, the mold 70 is provided with a temperature sensor 74 and a pressure sensor 75 .

The low-temperature temperature adjustment device 20 can adjust the temperature of the mold 70 to, for example, room temperature. The high-temperature temperature control device 10 can control the temperature of the mold 70 to a predetermined high temperature (for example, a temperature of about 110° C. to 230° C. to cure the thermosetting resin). In addition, the structure which does not comprise the temperature control apparatus 20 for low temperatures may be sufficient.

The mold control unit 80 functions as a control section, and includes a molding machine signal acquisition section 81 , a mold signal acquisition section 82 , a valve opening/closing control section 83 , and a counter pressure control section 84 .

A molding machine signal acquisition unit 81 acquires a predetermined signal from the molding machine 30 . The predetermined signal includes, for example, an injection start signal indicating that injection of resin has started, a first point-in-time signal indicating that the resin filling ratio is within a required range, and an injection completion signal indicating completion of injection. .

A mold signal acquisition unit 82 acquires a predetermined signal from the mold opening/closing device 76 . The predetermined signal includes, for example, a mold closing signal indicating that the mold has been closed, a mold opening signal indicating that the mold has been opened, and the like.

The valve opening/closing control section 83 can control opening/closing of the opposing valve 63 and the exhaust valve 64 .

The counter pressure controller 84 can control the pressure of the inert gas supplied by the counter pressure supply device 60 .

Next, details of the mold (the first mold member 71 and the second mold member 72) of the present embodiment will be described.

FIG. 2 is a schematic diagram showing a first example of the configuration of a main part of the first mold member 71 in perspective view, to which the second mold member 72 of the present embodiment is attached, and FIG. FIG. 4 is a schematic diagram showing a first example of the main configuration of the side surface of the first mold member 71 to which the second mold member 72 is attached, and FIG. FIG. 10 is a schematic diagram showing a first example of the main configuration of the front side of the first mold member 71 that has been formed. For convenience, the first mold member 73 is omitted in the figure. As shown in the figure, the first mold member 71 has a square shape when viewed from the front, and a cavity portion 701 having a circular shape when viewed from the front is formed in the center. The depth of the cavity portion 701 is appropriately determined according to the shape of the molded product. In the illustrated example, the shape of the cavity portion 701 is disk-like for the sake of convenience. A first mold member 73 (not shown) is also formed with a cavity corresponding to the shape of the molded product. The molded product can be, for example, a silicone resin lens, but is not limited to this. A spool 703 with which the nozzle of the molding machine 30 abuts is formed on one side surface of the first mold member 71 toward the gate 702 . For convenience, runners are omitted. The position of the spool 703 is not limited to the illustrated example.

The second mold member 72 is arranged at a position facing the gate 702 in the injection direction from the gate 702 provided in the first mold member 71 . The position facing the gate 702 can be, for example, the position of the cavity portion 701 facing the position of the gate 702 .

More specifically, the second mold member 72 is provided along the periphery of the cavity portion 701 from a position facing the gate 702 in the injection direction from the gate 702 . As shown, the second mold member 72 may be provided along the periphery of the cavity portion 701 with a position facing or near the gate 702 in between, or, although not shown, the gate 702 may be provided along the periphery of the cavity portion 701 with the position facing or near the position as one end. As a result, as will be described later, the gas generated in the cavity portion 701 (the gas generated by the chemical reaction caused by heating the liquid resin) enters the second mold member 72 . The surface area (patterned area in the drawing) can be increased, and the gas generated in the cavity portion 701 can be discharged from the cavity portion 701 in a plane through the numerous pores of the second mold member 72. 701 can be easily pulled out. Since the gas generated in the cavity portion 701 can be discharged planarly and uniformly, it is possible to prevent distortion of the molded product.

In addition, the second mold member 72 is arranged at a position facing the gate 702 in the direction of injection from the gate 702, a facing portion 721 communicating with the cavity portion 701, and communicating with the facing portion 721 and the cavity portion 701, and a peripheral edge portion 722 arranged on a part of the peripheral edge of the cavity portion 701 . The peripheral portion 722 communicates with the outside of the first mold member 71 through an exhaust passage 723 . An appropriate value is used for the surface area (patterned area in the drawing) of the peripheral edge portion 722 when the gas generated in the cavity portion 701 enters the peripheral edge portion 722 of the second mold member 72 in a planar manner. can do. In the example of FIG. 3, the dimension in the depth direction of the peripheral portion 722 is approximately half the depth of the cavity portion 701 (the depth in the first mold member 71). As a result, the gas generated in the cavity portion 701 can be easily discharged from the cavity portion 701 even when the shape, volume, etc. of the cavity portion 701 are different.

Further, as shown in FIG. 4, the angle θ between the line segments connecting the gate 702 and both end portions 722a and 722b of the peripheral portion 722 can be within the range of 45° to 90°. More specifically, when a line segment connecting the gate 702 and both end portions 722a and 722b of the peripheral edge portion 722 is projected onto the bottom surface (or top surface) of the cavity portion 701, the angle θ formed by the line segment is 45. ° to 90°. If the angle θ is less than 45°, the gas generated in cavity portion 701 becomes difficult to escape from cavity portion 701 . Moreover, when the angle θ exceeds 90°, the shape of the second mold member 72 (peripheral edge portion 722) becomes large and the cost becomes high. By setting the angle .theta. within the range of 45.degree.

Next, a method for controlling the mold 70 will be described.

FIG. 5 is a time chart showing an example of a mold control method by the mold control unit 80 of this embodiment. First, it is assumed that the mold 70 is closed and the exhaust valve 64 and counter valve 63 are closed. When the mold control unit 80 acquires an injection start signal from the molding machine 30 (that is, when the cavity portion 701 is filled with resin), the mold control unit 80 closes the exhaust valve 64 at a time point td after the injection start signal is acquired. to the open state. The time td can be determined as appropriate, and more specifically, it can be the timing at which gas is generated in the process of heating and thermosetting the resin.

FIG. 6 is a schematic diagram showing an example of gas generated in the cavity portion 701 during thermosetting of the liquid resin. As shown in FIG. 6, the liquid resin injected from the gate 702 into the cavity portion 701 spreads in the cavity portion 701 and flows toward the position facing the gate 702 (in the figure, the flow of the resin is indicated by the dashed arrows). show). Although the actual resin flow is more complicated, it is shown in a simplified form for the sake of convenience. The gas generated by the chemical reaction (for example, the polymerization process) during the thermosetting of the liquid resin reaches the second mold member 72 (specifically, the facing portion 721 and the peripheral portion 721) arranged at a position facing the gate 702. The gas flows into the fluid pipe through minute pores in the portion 722) and is discharged to the outside of the cavity portion 701 (the flow of the gas is indicated by solid arrows in the drawing). Since the second mold member 72 has air permeability, the area from which the gas can be discharged from the cavity portion 701 is larger than that of the ventilation gate, and the gas can be uniformly discharged in a planar manner. can be easily removed from the cavity portion 701 . Moreover, it is possible to prevent the distortion of the molded product.

In addition, since the gas generated in the cavity portion 701 can be easily released compared to the conventional mold provided with the conventional ventilation gate, the injection pressure can be reduced. In addition, since there is no need to use a vacuum degassing device as in the conventional method, the pressure in the cavity can be made static, and the molded product will not stick to the inside of the mold, allowing the molded product to be removed from the mold. becomes easier.

The mold control unit 80 closes the exhaust valve 64 and opens the opposing valve 63 at a predetermined first time point after the resin is filled. Thereby, the counter pressure supply device 60 can supply the gas having the counter pressure to the cavity portion 701 through the fluid pipe 66 and the second mold member 72 . The counter pressure can be, for example, equal to or higher than the gas pressure in the cavity 701 and lower than the injection pressure. The predetermined first time point can be, for example, the timing when the tip of the resin flowing through the cavity portion 701 reaches the side wall of the cavity portion 701, and the filling rate of the resin is within a predetermined range (for example, 90% or more, or more). preferably 95% or more).

FIG. 7 is a schematic diagram showing an example of a state when gas having a counter pressure is injected into the cavity portion 701. As shown in FIG. In the drawing, the patterned area indicates the filled resin, but since the appearance of the actual resin in the cavity portion 701 is complicated, the illustration is simplified. Also, although the tip of the resin reaches the side wall of the cavity portion 701, in the figure, the tip of the resin and the cavity are separated from each other in order to clearly show that gas of corresponding pressure (gas of counter pressure) is injected. A gap is shown between the side walls of the portion 701 .

When the tip of the resin reaches the side wall of the cavity 701, injection pressure must be applied to the cavity 701 to complete the filling of the resin or until the thermosetting reaches the desired state. . For this reason, the tip of the resin penetrates into minute gaps between the first mold members 71 and 73 and causes burrs. By applying a counter pressure through the second mold member 72, it is possible to suppress the intrusion of the resin and reduce the occurrence of burrs.

FIG. 8 is a schematic diagram showing an example of the shape of the front side of the molded product. The example of FIG. 8 is, for example, an automobile lens. As shown in the figure, in the case of this embodiment, no burrs are generated around the circular molded product. On the other hand, in a comparative example (an example in which counterpressure gas is not injected), burrs are occasionally found around the molded product (that is, a region corresponding to part of the side wall of the cavity). As described above, in the present embodiment, by applying counter pressure through the second mold member 72, it is possible to suppress the resin from entering the gap between the first mold members 71 and 73, thereby reducing the occurrence of burrs. can be done.

The mold control unit 80 controls the opposing valve 63 to be open until the mold 70 is opened after the injection is completed and the resin is cured. Back pressure is applied to the cavity portion 701 until the mold 70 is opened in order to prevent distortion of the molded product. By applying the counter pressure, it is possible to suppress the intrusion of the resin due to the back pressure and further reduce the occurrence of burrs.

The mold control unit 80 increases the pressure of the fluid (gas) supplied from the counterpressure supply 60 when the mold 70 opens. Since the discharged gas may remain in the pores of the second mold member 72, the pores of the second mold member 72 are cleaned by increasing the counter pressure and supplying the gas to the second mold member 72. The second mold member 72 can be used for a long time without being removed from the first mold member 71 . Mold control unit 80 then closes counter valve 63 .

The shape of the second mold member 72 is not limited to the above example. Other shapes of the second mold member 72 will be described below.

FIG. 9 is a schematic diagram showing a second example of the configuration of the essential parts of the first mold member 71 to which the second mold member 72 of the present embodiment is attached, in a perspective view of the appearance. As shown in FIG. 9, the second mold member 72 is provided along the periphery of the cavity portion 701 from a position facing the gate 702 in the injection direction from the gate 702 . As shown in the drawing, the second mold member 72 is provided along the periphery of the cavity portion 701 with a position facing the gate 702 or a vicinity thereof therebetween. The difference from the first example illustrated in FIG. 2 is that the dimension in the depth direction of the second mold member 72 is the same as the depth of the cavity portion 701 (the depth in the first mold member 71). . As a result, the gas generated in the cavity portion 701 can be easily discharged from the cavity portion 701 according to the shape and volume of the cavity portion 701 . In addition, depending on the shape, volume, etc. of the cavity portion 701 , counter pressure can be applied to the cavity portion 701 through the second mold member 72 , and the resin can flow into the gap between the first mold members 71 and 73 . Intrusion can be suppressed to reduce the occurrence of burrs.

FIG. 10 is a schematic diagram showing a third example of the configuration of the main parts of the first mold member 71 to which the second mold member 72 of the present embodiment is attached, in a perspective view of the appearance. As shown in FIG. 10, the second mold member 72 is arranged at a position facing the gate 702 in the injection direction from the gate 702, and has a facing portion 721 communicating with the cavity portion 701, and a facing portion 721 and the cavity portion. 701 and a peripheral edge portion 722 arranged on a part of the peripheral edge of the cavity portion 701 . The difference from the first example illustrated in FIG. 2 is that the dimension of the peripheral portion 722 in the depth direction decreases from the opposing portion 721 side toward both end portions 722a and 722b of the peripheral portion 722 . As a result, the gas generated in the cavity portion 701 can be easily discharged from the cavity portion 701 according to the shape and volume of the cavity portion 701 . In addition, depending on the shape, volume, etc. of the cavity portion 701 , counter pressure can be applied to the cavity portion 701 through the second mold member 72 , and the resin can flow into the gap between the first mold members 71 and 73 . Intrusion can be suppressed to reduce the occurrence of burrs.

In the above example, the case where the shape of the cavity portion 701 when viewed from the front is circular has been described, but the shape of the cavity portion 701 when viewed from the front is not limited to a circular shape. Other examples are described below.

FIG. 11 is a schematic diagram showing another example of the shape of the cavity portion 701 when viewed from the front. In FIG. 11A, the shape of the cavity portion 701 in front view is elliptical, in FIG. 11B, the shape of cavity portion 701 in front view is rectangular, and in FIG. 11C, the shape of cavity portion 701 in front view is triangular. Shape. In either case, the second mold member 72 is provided along the periphery of the cavity portion 701 from a position facing the gate 702 in the injection direction from the gate 702 . As a result, the gas generated in the cavity portion 701 can be easily discharged from the cavity portion 701 according to the shape and volume of the cavity portion 701 . In addition, depending on the shape, volume, etc. of the cavity portion 701 , counter pressure can be applied to the cavity portion 701 through the second mold member 72 , and the resin can flow into the gap between the first mold members 71 and 73 . Intrusion can be suppressed to reduce the occurrence of burrs.

FIG. 12 is a flow chart showing an example of the processing procedure of the mold control system of this embodiment. In the following description, for the sake of convenience, the mold control system will be described as the subject of the processing, including the processing of the molding machine 30 and the mold temperature adjustment processing. The mold control system adjusts the mold temperature to room temperature (S11) and starts injection (S12). The mold control system adjusts the mold temperature to a predetermined high temperature (S13) to thermoset the liquid resin.

The mold control system (mold control unit 80 ) opens the exhaust valve 64 ( S<b>14 ) and exhausts the gas generated in the cavity portion 701 from the cavity portion 701 . The mold control system (mold control unit 80) determines whether it is the predetermined first time point (S15), and if it is not the predetermined first time point (NO in S15), continues the processing of step S15.

If it is the predetermined first time point (YES in S15), the mold control system (mold control unit 80) closes the exhaust valve 64, opens the opposing valve 63 (S16), and opens the cavity through the second mold member 72. A counter pressure is applied to the portion 701 .

The mold control system (mold control unit 80) determines whether or not the mold 70 has been opened (S17), and if the mold 70 has not been opened (NO in S17), continues the process of step S17. When the mold 70 is opened (YES in S17), the mold control system (mold control unit 80) raises the counter pressure (counter pressure) for a predetermined time (S18) to clean the second mold member 72. . The mold control system (mold control unit 80) closes the opposing valve 63 (S19) and ends the process.

A mold control device according to the present embodiment is a mold control device that includes a mold and controls the state inside the mold, and the mold is a first mold member made of a non-permeable metal. and a second mold member made of an air-permeable metal or air-permeable ceramic that communicates with the cavity portion of the first mold member, the The second mold member is arranged at a position facing the gate, and when the cavity is filled with resin, a first on-off valve provided in a fluid pipe communicating with the second mold member is opened. A control unit is provided to control the

The mold control unit of the present embodiment is a mold control unit that controls the state inside the mold, and shows that the resin is filled in the cavity of the first mold member made of a non-permeable metal. A signal acquisition unit that acquires a signal, and a fluid pipe that communicates with a second mold member that is made of an air-permeable metal or air-permeable ceramic and communicates with the cavity when the signal is acquired by the signal acquisition unit. a control unit that controls the first on-off valve to open.

The mold of this embodiment includes a first mold member made of metal without air permeability, and a second mold member made of air permeable metal or air permeable ceramic, communicating with the cavity of the first mold member. and the second mold member is arranged at a position facing the gate in the injection direction from the gate provided in the first mold member.

The mold control method of the present embodiment is a mold control method for controlling the state inside the mold, and indicates that the resin is filled in the cavity of the first mold member made of a non-permeable metal. A signal is acquired, and when the signal is acquired, a first on-off valve provided in a fluid pipe communicating with a second mold member which is made of an air-permeable metal or an air-permeable ceramic and communicates with the cavity is opened. to control.

The mold includes a first metal mold member that is impermeable and a second mold member that is in communication with the cavity of the first mold member and is made of a breathable metal or ceramic. The first mold member is composed of, for example, a fixed side that is fixed to the injection molding machine and a movable side that moves when the mold is opened and closed. A gate is provided on the fixed side. Air-permeable metals are metal materials (including porous metals) with countless micropores and have air-permeability. In addition, the gas-permeable metal includes not only a case in which fine pores are provided in advance in a metal material, but also a case in which fine pores are formed by processing. The average diameter of pores (for example, several tens of μm) and the porosity can be appropriately set. The second mold member is not limited to an air-permeable metal, and may be a sintered body (formed body) obtained by heat-treating and baking an inorganic compound such as air-permeable ceramic. Also, when the second mold member is made of breathable metal, the surface of the breathable metal may be coated with a breathable ceramic.

The second mold member is arranged at a position facing the gate in the injection direction from the gate provided on the first mold member. The position facing the gate can be, for example, the position of the cavity facing the position of the gate.

The controller controls the first on-off valve provided in the fluid pipe communicating with the second mold member to open when the cavity is filled with the resin. The resin can be, for example, a plurality of (for example, two) types of liquid thermosetting resins, such as silicone resin, urethane resin, and epoxy resin. More specifically, the case where the cavity is filled with resin can be the timing at which gas is generated during the process of heating and thermosetting the resin.

The liquid resin injected into the cavity from the gate flows toward the position facing the gate while spreading in the cavity. The gas generated by the chemical reaction during thermosetting of the liquid resin flows into the fluid pipe through the fine pores of the second mold member arranged opposite to the gate, and is discharged outside the cavity. Since the second mold member has air permeability, the area from which gas can be discharged from the cavity is larger than that of the ventilation gate, the gas can be uniformly discharged, and the gas can be easily discharged from the cavity.

In the mold control device of the present embodiment, the control unit controls the first on-off valve to a closed state at a predetermined first time point after the resin is filled, and pressurizes the pressure supplied by the counter pressure supply device. The fluid thus formed flows to open the second on-off valve provided in the fluid pipe communicating with the second mold member.

The control unit closes the first on-off valve at a predetermined first time point after the resin is filled, and the pressurized fluid supplied by the counterpressure supply device flows to communicate with the second mold member. The second on-off valve provided in the fluid pipe to be connected is controlled to open.

The counterpressure supply device can supply gas having counterpressure to the cavity portion, for example, through the fluid line and the second mold member. The counter pressure can be, for example, equal to or higher than the gas pressure in the cavity and lower than the injection pressure. The predetermined first point in time can be, for example, the timing when the tip of the resin flowing through the cavity reaches the side wall of the cavity, and can be the point in time when the filling rate of the resin falls within a predetermined range. .

When the leading edge of the resin reaches the sidewall of the cavity, injection pressure must be applied to the cavity to complete the filling of the resin or until the desired thermal cure is reached. For this reason, the tip of the resin penetrates into a minute gap between the fixed side and the movable side of the first mold member and causes burrs. By applying counter pressure through the second mold member, it is possible to suppress the intrusion of the resin and reduce the occurrence of burrs.

In the mold control device of the present embodiment, the control section controls the second on-off valve to open until the mold is opened.

The control unit keeps the second on-off valve open until the mold is opened. Back pressure is applied to the cavity until the mold opens in order to prevent distortion of the molded product. It is possible to further reduce the occurrence of burrs by suppressing the intrusion of the resin due to the

In the mold control device of this embodiment, the control section increases the pressure of the fluid supplied from the counter pressure supply device when the mold is opened.

The controller increases the pressure of the fluid supplied from the counter pressure supply when the mold opens. Since the discharged gas may remain in the pores of the second mold member, the second mold member can be cleaned by increasing the counter pressure and supplying it to the second mold member. 2 It can be used for a long time without removing the mold member.

In the mold control device of the present embodiment, the first mold member and the second mold member are constructed in a fitting structure.

In the mold of the present embodiment, the first mold member and the second mold member are constructed in a fitting structure.

Since the first mold member and the second mold member are configured in a fitting structure, the mounting or removal of the second mold member is facilitated.

In the mold control device of the present embodiment, the second mold member is provided along the periphery of the cavity portion from a position facing the gate in the injection direction from the gate.

In the mold of this embodiment, the second mold member is provided along the periphery of the cavity portion from a position facing the gate in the injection direction from the gate.

The second mold member is provided along the periphery of the cavity from a position facing the gate in the injection direction from the gate. The second mold member may be provided along the periphery of the cavity with a position or a vicinity of the position facing the gate in between, or along the periphery of the cavity with a position or a vicinity of the position facing the gate as one end. may be provided. Thereby, the surface area of the second mold member can be increased when the gas generated in the cavity enters the second mold member, and the gas can be easily discharged from the cavity.

In the mold control apparatus of the present embodiment, the second mold member is arranged at a position facing the gate in the injection direction from the gate, and includes a facing portion communicating with the cavity portion, and the facing portion and a peripheral edge portion that communicates with and is disposed on a portion of the peripheral edge of the cavity portion.

In the mold of this embodiment, the second mold member includes a facing portion that is arranged in a position facing the gate in the direction of injection from the gate and communicates with the cavity portion, and a facing portion that communicates with the facing portion. and a peripheral edge part arranged on a part of the peripheral edge of the cavity part.

The second mold member has a facing portion that is arranged at a position facing the gate in the injection direction from the gate and communicates with the cavity portion, and a peripheral edge that communicates with the facing portion and is arranged on a part of the peripheral edge of the cavity portion. and a part. By using an appropriate value for the surface area of the peripheral edge when the gas generated in the cavity enters the peripheral edge of the second mold member, even if the shape and volume of the cavity are different, the gas can be absorbed. It can be made easy to pull out from a cavity part.

In the mold control device of the present embodiment, the angle formed by the line segment connecting the gate and each end of the peripheral portion is within the range of 45° to 90°.

In the mold of this embodiment, the angle formed by the line segments connecting the gate and both end portions of the peripheral portion is in the range of 45° to 90°.

The angle between the line segment connecting the gate and each end of the peripheral portion is within the range of 45° to 90°. More specifically, when a line segment connecting the gate and both ends of the peripheral portion is projected onto the bottom surface (or top surface) of the cavity portion, the angle formed by the line segment is within the range of 45° to 90°. can be If the angle is less than 45°, it becomes difficult to release the gas from the cavity. Also, if the angle exceeds 90°, the shape of the second mold member becomes large and the cost becomes high. By setting the angle within the range of 45° to 90°, the gas can be easily discharged from the cavity portion while suppressing the high cost.

At least part of the above-described embodiments can be combined arbitrarily.

10 temperature control device for high temperature 11, 12, 21, 22, 43, 53 electromagnetic valve 13 medium transfer pipe 23 return pipe 20 temperature control device for low temperature 30 molding machine 40, 50 metering supply device 44, 54 material supply pipe 60 opposition Pressure supply device 63 Counter valve 64 Exhaust valve 66 Fluid pipe 70 Mold 701 Cavity part 702 Gate 71, 73 First mold member 72 Second mold member 721 Opposed part 722 Peripheral part 80 Mold control unit 81 Molding machine signal acquisition Section 82 Mold Signal Acquisition Section 83 Valve Opening/Closing Control Section 84 Opposing Pressure Control Section

Claims (14)

A mold control device that includes a mold and controls the state inside the mold,
The mold is
a non-permeable metal first mold member;
a second mold member made of an air permeable metal or an air permeable ceramic, communicating with the cavity portion of the first mold member;
The second mold member is arranged at a position facing the gate in the injection direction from the gate provided in the first mold member,
A control unit that controls a first on-off valve provided in a fluid pipe that communicates with the second mold member to open when the cavity is filled with resin ,
The control unit
The first on-off valve is controlled to be closed at a predetermined first time after the mold is closed and the resin is filled into the cavity, and the pressurized fluid supplied by the counter pressure supply device is released. A mold control device that controls a second on-off valve provided in a fluid pipe that communicates with the second mold member to open . The control unit
2. The mold control device according to claim 1 , wherein said second on-off valve is controlled to be open until said mold is opened. The control unit
3. A mold control device according to claim 1 or 2 , wherein when the mold is opened, the pressure of the fluid supplied from the counter pressure supply device is increased. 4. The die control device according to any one of claims 1 to 3 , wherein the first die member and the second die member are configured in a fitting structure. The second mold member is
The mold control device according to any one of claims 1 to 4 , which is provided along the periphery of the cavity portion from a position facing the gate in the injection direction from the gate. The second mold member is
a facing portion disposed at a position facing the gate in the injection direction from the gate and communicating with the cavity portion;
The mold control device according to any one of claims 1 to 5 , further comprising: a peripheral edge portion that communicates with the facing portion and is arranged on a part of the peripheral edge of the cavity portion. 7. The mold control device according to claim 6 , wherein an angle formed by a line segment connecting said gate and each end of said peripheral portion is within a range of 45[deg.] to 90[deg.]. A mold control unit that controls the state inside the mold,
a signal acquisition unit that acquires a signal indicating that the cavity of the first mold member made of non-permeable metal is filled with resin;
When the signal acquisition unit acquires the signal, the first on-off valve provided in the fluid pipe communicating with the second mold member, which is made of an air permeable metal or an air permeable ceramic and communicates with the cavity, is controlled to open. and a control unit for
The control unit
The first on-off valve is controlled to a closed state at a predetermined first time point after the resin is filled into the cavity portion with the mold closed, and the pressurized fluid supplied by the counter pressure supply device is released. A mold control unit that controls a second on-off valve provided in a fluid pipe that communicates with the second mold member to open . a non-permeable metal first mold member;
a second mold member made of an air permeable metal or an air permeable ceramic, communicating with the cavity portion of the first mold member;
The second mold member is arranged at a position facing the gate in the injection direction from the gate provided in the first mold member ,
A mold for supplying a gas having a counter pressure to the cavity through the second mold member . 10. The mold according to claim 9 , wherein said first mold member and said second mold member are configured in a fitting structure. The second mold member is
The mold according to claim 9 or 10 , which is provided along the periphery of the cavity from a position facing the gate from the gate toward the injection direction. The second mold member is
a facing portion disposed at a position facing the gate in the injection direction from the gate and communicating with the cavity portion;
12. The mold according to any one of claims 9 to 11 , further comprising: a peripheral edge portion that communicates with the facing portion and is arranged on a part of the peripheral edge of the cavity portion. 13. The mold according to claim 12 , wherein the angles formed by line segments connecting the gate and both ends of the peripheral edge are in the range of 45[deg.] to 90[deg.]. A mold control method for controlling the state inside the mold,
Acquiring a signal indicating that the cavity portion of the first metal mold member having no air permeability is filled with resin,
When the signal is acquired, controlling the first on-off valve provided in the fluid pipe communicating with the second mold member, which is made of an air permeable metal or air permeable ceramic and communicates with the cavity portion, to an open state ,
The first on-off valve is controlled to be closed at a predetermined first time after the mold is closed and the resin is filled into the cavity, and the pressurized fluid supplied by the counter pressure supply device is released. A mold control method for controlling a second on-off valve provided in a fluid pipe communicating with the second mold member so as to be in an open state .

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