JP5452378B2 - INJECTION MOLDING DEVICE AND METHOD FOR PRODUCING RESIN MOLDED BODY - Google Patents

Description

  The present invention relates to an injection molding apparatus and a method for producing a molded body of resin.

  FIG. 12 is a view showing a conventional injection molding apparatus. The mold block 130 is clamped in the mold opening / closing direction together with the molding resin 140 with the cavity block 114 and the clamper 116 provided in the upper mold 120 and the lower mold 112, and the molded article 130 is molded by resin molding by compression molding. In the resin molding method, the molded product 130 and the resin 140 are supplied to the upper mold 120 and the cavity block 114 in a state where the mold is opened, the resin mold region is air-sealed and evacuated, and then the upper mold 120 and the cavity The molded product 130 is clamped by the block 114 and the clamper 116 and resin-molded.

JP 2005-053143 A

  Patent Document 1 describes a method in which a resin is molded by reducing the pressure of a region that is not filled with resin in a cavity by vacuum evacuation. In the conventional method of molding a resin, the generation of bubbles mixed in the molded product of the resin is suppressed. However, when forming a molded product having a complicated cavity shape, there is a region in the cavity that is not filled with resin. Since all of the pressure is reduced at the same pressure, depending on the shape of the cavity, the resin is further injected into the portion that is already filled with the resin, so that the resin overflows from the cavity and the use efficiency of the resin is poor. There was a problem.

  This invention solves the subject mentioned above and provides the injection molding apparatus which shape | molds resin, and the manufacturing method of the molded object of resin.

The present invention provides an injection molding apparatus that molds a resin using a mold having a cavity formed by a first mold and a second mold, and includes a plurality of cavity connection end portions having an outgate connectable to the cavity. The plurality of cavity connection end portions are connected to a decompression capacity that is a volume of the decompressed space, and the decompression capacity includes the decompression capacity connected to the other cavity connection end portions. These are injection molding apparatuses characterized in that their capacities can be controlled independently . By independently controlling the decompression capacity, which is the volume of the decompressed space, each region that is not filled with resin in the cavity is appropriate even when forming a molded product with a complicated cavity shape. The pressure is reduced with a reduced pressure capacity. Therefore, the problem that the amount of the resin overflowing from the cavity is small and the use efficiency of the resin is poor is solved.

  The injection molding apparatus of the present invention has a plurality of cavities in the mold, and has at least one connectable outgate for each cavity, thereby forming a plurality of molded bodies. Even in this case, an appropriate decompression capacity can be set for each cavity. Therefore, the amount of resin overflowing from the cavity is small, and the use efficiency of the resin is good.

Further, injection molding apparatus of the present invention, injected the resin is provided in plural corresponding to each of the endpoint detection section before Kia Utogeto determines that it has reached the said plurality of cavities connection end, It has a control part which controls increase / decrease in a plurality of said decompression capacity by the arrival time of each end point signal which notifies that said resin from a plurality of said end point detection parts reached said cavity connection end. And As a result, it is possible to control the decompression capacity to increase / decrease after overflowing from the cavity after the resin reaches the end point detection unit, so that the resin does not overflow from the cavity, and the usage efficiency of the resin is further improved.

Further, the present invention uses the injection molding apparatus, the molding preparation step of the pre-Kia Utogeto respectively connected to said cavity, each of said endpoint signals from the plurality of endpoint detection unit is confirmed all until it performs injection of the resin, a first molding step of molding a resin, wherein the arrival time of a plurality of the endpoint signal from the endpoint detection section, corresponding to the out-gates of which are connected to the cavity The reduced pressure capacity control step for controlling the increase / decrease of the reduced pressure capacity, and the resin is injected into the mold until each of the endpoint signals from the plurality of endpoint detection units is confirmed, It has a 2nd shaping | molding process which shape | molds resin, It is a manufacturing method of the molded object of resin characterized by the above-mentioned. Accordingly, the decompression capacity of each out-gate can be set repeatedly from the end-point signal from each of the plurality of end-point detection units before resin molding. For this reason, even if the resin is molded a plurality of times, the arrival time of the resin to each end point detection unit becomes constant, and the resin does not overflow from the cavity, so that the use efficiency of the resin is good.

The present invention also end from the use of a injection molding apparatus, prior Kia Utogeto and molding preparation step of connecting each of said cavities, to start the injection of the resin into the cavity, the plurality of endpoints detection unit After receiving the point signal to control the increase of the pressure reducing capacity corresponding to the out gate in which the endpoint detection section that does not originate the endpoint signal is provided, the endpoint signal, confirmed all And a reduced pressure capacity control molding step of molding the resin by injecting the resin and producing the molded product of the resin. This makes it possible to control the amount of increase in the decompression capacity of each out-gate while injecting resin into the cavity, so it is necessary to check the arrival time of the resin at the endpoint detection unit in advance by injecting excessive resin The efficiency of using the resin is even better because it is eliminated.

  The method for producing a molded product of a resin according to the present invention is a method for producing a molded product of resin, wherein the resin is an ultraviolet curable resin or a thermosetting resin. By controlling the decompression capacity to an appropriate value, it is possible to prevent excessive leakage from the resin mold. Therefore, UV curable resin or thermosetting with low viscosity that easily leaks from the gap between the first mold and the second mold. Suitable for resin molding.

  Furthermore, the method for producing a resin molded body according to the present invention is a method for producing a resin molded body, wherein the first mold is a film and the molded body is formed on the film surface. Thereby, even if it is a case where the film which is a flexible material is used as a 1st type | mold by controlling decompression capacity | capacitance to an appropriate value, the leak from the clearance gap with a 2nd type | mold can be prevented. Therefore, it is suitable for molding a resin on the film surface.

  In the injection molding apparatus according to the present invention, even if a molded body having a complicated cavity shape is formed by independently controlling the reduced pressure capacity, which is the volume of the decompressed space, the resin in the cavity is filled. Each area that is not is depressurized with an appropriate depressurization volume. Therefore, the problem that the amount of the resin overflowing from the cavity is small and the use efficiency of the resin is poor is solved.

Moreover, in the manufacturing method of this invention, it can set before the shaping | molding of resin which repeatedly performs the decompression capacity | capacitance of each out-gate from the endpoint signal from each of several endpoint detection part. For this reason, even if the resin is molded a plurality of times, the arrival time of the resin to each end point detection unit becomes constant, and the resin does not overflow from the cavity, so that the use efficiency of the resin is good.

It is a figure which shows the installation process of the type | mold in the injection molding apparatus of 1st Embodiment. It is a figure which shows the shaping | molding preparation process in the injection molding apparatus of 1st Embodiment. It is a figure which shows the 1st shaping | molding process in the injection molding apparatus of 1st Embodiment. It is a figure which shows the pressure reduction capacity | capacitance control process in the injection molding apparatus of 1st Embodiment. It is a figure which shows the 2nd shaping | molding process in the injection molding apparatus of 1st Embodiment. It is a top view which shows the 2nd type | mold installed in the injection molding apparatus of 1st Embodiment. It is a top view which shows the modification of the 2nd type | mold which installs 1st Embodiment in an injection molding apparatus. It is a figure which shows the installation process of the type | mold in the injection molding apparatus of 2nd Embodiment. It is a figure which shows the shaping | molding preparation process in the injection molding apparatus of 2nd Embodiment. It is a figure which shows the pressure reduction capacity control molding process in the injection molding apparatus of 2nd Embodiment. It is a figure which shows the hardening process of resin in the injection molding apparatus of 2nd Embodiment. It is a figure which shows the conventional injection molding apparatus.

  Next, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIGS. 1 to 5 are views for explaining a method for producing a resin molded body in an injection molding apparatus for explaining the first embodiment of the present invention. FIG. 6 is a top view showing a mold installed in the injection molding apparatus for explaining the first embodiment of the present invention. Further, FIG. 7 is a top view showing a modified example of the mold installed in the injection molding apparatus for explaining the first embodiment of the present invention.

  In addition, the structure and type | mold of the injection molding apparatus which concern on this Embodiment are not limited to this, You may change suitably.

  1 to 5 are views for explaining a method for producing a resin molded body in the injection molding apparatus of this embodiment. FIG. 1 shows a mold installation process in which the first mold 10 and the second mold 12 are installed in the injection molding apparatus 1 according to the present embodiment. The second mold 12 is formed with a plurality of cavities 5 for forming a resin molding. The cavity 5 is connected with an in-gate 7 for injecting resin, and the in-gate 7 is connected with the resin injection port 2. In the present embodiment, the resin inlet 2 is illustrated as being installed in the first mold 10, but may be installed in the second mold 12. On the other hand, each of the cavities 5 is connected to a flow gate 9 for overflowing the resin after filling with the resin, and each of the flow gates 9 is provided with a hole 17. In the present embodiment, the holes 17 are illustrated as being installed in the first mold 10, but may be installed in the second mold 12. The injection molding apparatus 1 includes a plurality of cavity connection end portions 15 that can be connected to the holes 17 and connectable to the cavities 5. Each cavity connection end 15 is provided with an out-gate 13 connected to the cavity 5 via the hole 17 and an end point detection unit 18 for detecting the arrival of the resin. Further, a pressure reducing capacity 23 which is a volume of the decompressed space and can control the volume is connected to the subsequent stage of the cavity connecting end 15 via the valve 20.

Next, FIG. 2 is a figure which shows the shaping | molding preparation process based on this embodiment. As shown in FIG. 2, the respective cavity connection ends 15 are pressed against all the holes 17. As a result, the out gate 13 and the cavity 5 are connected.

  Next, FIG. 3 shows a first molding step according to the present embodiment. As shown in FIG. 3, a resin 30 that is a thermosetting resin such as an acrylic resin or an epoxy resin is supplied from the resin injection port 2. The supplied resin 30 is injected into the cavity 5 through the in-gate 7. After the cavity 5 is filled with the resin 30, the resin 30 reaches the out gate 13 through the flow gate 9 and the hole 17. When the resin 30 reaches the out gate 13, an endpoint signal 33 is output from the endpoint detector 18. In FIG. 3, the resin 30 is filled from one of the plurality of cavities 5 (left side in FIG. 3) to the outgate 13, and the end point signal 33 is already output, and the other cavity 5 (right side in FIG. 3). Shows a state in which the resin 30 is not filled and the end point signal 33 is not output. The resin 30 is injected until the endpoint signals 33 from all the endpoint detectors 18 are output. After the injection of the resin 30 into each cavity 5, the valve 20 connected to the rear stage of the cavity connection end 15 is opened so that the outgate 13 and the decompression capacity 23 are communicated with each other. After the resin 30 is injected, the valve 20 is closed.

  Next, FIG. 4 shows a decompression capacity control process according to the present embodiment. As shown in FIG. 4, the injection molding apparatus 1 of the present embodiment includes a control unit 25. The control unit 25 receives the end point signal 33 from each end point detection unit 18, and calculates each time to reach the end point detection unit 18 from the injection of the resin 30. The control unit 25 independently controls increase / decrease in the volume of the decompression capacity 23 of each outgate 13 from the arrival time of the resin 30 to each end point detection unit 18. In addition, the control unit 25 can record the arrival time, and can compare the previous resin arrival time for each cavity 5 with the arrival time acquired this time. If the arrival time acquired this time is longer than each previous resin arrival time, control is performed to increase the volume of the decompression capacity 23. Conversely, if the arrival time acquired this time is shorter than each previous resin arrival time. Then, control is performed to reduce the volume of the decompression capacity 23. Note that FIG. 4 shows that one of the plurality of decompression capacities 23 (left side in FIG. 4) maintains the initial volume as a result of the increase / decrease control, and the volume of the decompression capacities 23 on the other side (right side in FIG. 4) is controlled. The state where the increased volume 3 is generated is shown. However, for the first time only, a desired initial value is used as the arrival time when the resin 30 is injected last time. For the control of the increase / decrease of the volume of the decompression capacity 23, a syringe is suitable because the controllability of the volume increase / decrease accuracy is good, simple and immediate.

  Next, although not shown, there is a curing process of the resin 30, and the temperature of the first mold 10 and the second mold 12 is increased to a predetermined temperature until the injected resin 30 is cured, and the resin 30 is cured. Then, the temperature rise is stopped. After the resin is cured, the resin injection port 2 and the cavity connection end 15 are separated from the first mold 10, the first mold 10 and the second mold 12 are separated, and the molded product is taken out.

  Next, FIG. 5 shows a second molding step according to the present embodiment. In the second molding step, as in the first molding step, the resin 30 is injected to obtain a molded product. In the second molding step, the increased volume 3 is provided in the reduced pressure capacity 23 connected to the cavity 5 (right side in FIG. 5) in which the arrival time of the resin 30 is long in the reduced pressure capacity control process. By the action of the increase volume 3, the pressure in the cavity 5 becomes lower than the pressure in the other cavities 5 (left side in FIG. 5). As a result, since the filling time of the resin 30 in the cavity 5 provided with the increase volume 3 is shortened, the respective arrival times until the end point signals 33 from all the end point detection units 18 are output, Compared to the first molding process, it is complete. After the resin 30 is injected, the valve 20 is closed.

  Next, although not shown, the molded product is taken out in the same manner as after the first molding step.

  In the present embodiment, the process up to the second molding step for molding the resin 30 up to twice is described, but when the molding is repeated three times or more, the decompression capacity control step shown in FIG. 4 and FIG. 5 are shown. The second molding process and the curing process of the resin 30 may be repeated. The more the resin 30 molding process is repeated, the more the arrival time of the resin 30 to each endpoint detection unit 18 becomes constant. Since the overflow does not occur, the use efficiency of the resin 30 is good.

FIG. 6 shows a top view of the second mold 12 used in the injection molding apparatus 1 of the present embodiment, and illustrates a case where there are a plurality of cavities 5 and eight. FIG. 7 illustrates a case where a single cavity 5 having a complicated shape has a plurality of end portions and a flow gate 9 is provided at each end portion. Even in such a case, the same effect as that of the present embodiment can be obtained by connecting the cavity connecting portion 15 connected to the decompression capacity 23 capable of controlling the volume to each flow gate 9, The use efficiency of the resin 30 is good.
[Second Embodiment]
8 to 11 are views for explaining a method of manufacturing a resin molded body in the injection molding apparatus according to the second embodiment. This embodiment is different from the first embodiment in that a film is used as the first mold 10, a reduced pressure capacity control method, and a curing method of the resin 30. FIG. 8 shows a mold installation process in which the first mold 10 and the second mold 12 are installed in the injection molding apparatus 1 according to the present embodiment. As shown in FIG. 8, first, the first mold 10 and the second mold 12 are installed in the injection molding apparatus 1 according to the present embodiment, as in the first embodiment. Is a film. The material of the film of the first mold 10 is exemplified when a cycloolefin polymer is used. However, the material of the film is not limited to this, and is PMMA or PET coated with a resin having a low refractive index. It does not matter. In the second mold 12, as in the first embodiment, a cavity 5 for forming a resin molded body is formed. The cavity 5 is connected with an in-gate 7 for injecting resin, and the in-gate 7 is connected with the resin injection port 2. On the other hand, a plurality of flow gates 9 for overflowing the resin after filling the resin are connected to the cavity 5, and each of the flow gates 9 is provided with a hole 17.

  Next, FIG. 9 is a figure which shows the shaping | molding preparation process which concerns on this embodiment, and the outgate 13 and the cavity 5 are connected in the same procedure as the shaping | molding preparation process of 1st Embodiment.

  FIG. 10 shows a decompression capacity control molding process for molding the resin according to this embodiment. As shown in FIG. 10, a resin 30 that is an ultraviolet curable resin such as an acrylic resin or an epoxy resin is supplied from the resin injection port 2. The supplied resin 30 is injected into each cavity 5 through the in-gate 7. After the cavity 5 is filled with the resin 30, the resin 30 reaches the out gate 13 through the flow gate 9 and the hole 17. When the resin 30 reaches the out gate 13, the endpoint signal 33 is output from each endpoint detection unit 18. When the control unit 35 receives the first endpoint signal 33 from the plurality of endpoint detection units 18, the control unit 35 is connected to the outgate 13 provided with the endpoint detection unit 18 that does not output the endpoint signal 33. The valve 20 is opened so that the outgate 13 and the decompression capacity 23 communicate with each other. Further, the control unit 35 performs control so as to increase the volume of the decompression capacity 23 connected to the valve 20 in the opened state. Further, when receiving the new endpoint signal 33, the control unit 35 closes the valve 20 connected to the outgate 13 provided with the endpoint detection unit 18 that newly outputs the endpoint signal 33, Control is performed so as to further increase the volume of the decompression capacity 23 connected to the outgate 13 provided with the endpoint detection unit 18 that has not yet output the endpoint signal 33. In this way, the volume of the decompression capacity 23 is sequentially determined and repeatedly controlled, and the resin 30 is injected until all the end point signals 33 are confirmed.

Next, FIG. 11 is a figure which shows the hardening process of resin which concerns on this embodiment. As shown in FIG. 11, the resin 30 is cured by irradiating ultraviolet rays. In the present embodiment, the case of irradiating ultraviolet rays from the film side which is the first mold 10 is illustrated, but ultraviolet rays may be irradiated from the second mold 12 side. However, in this case, the second mold 12 is made of a material that transmits ultraviolet rays, such as quartz.

  Then, although not shown, after the resin 30 is cured, the ultraviolet irradiation is stopped, the resin injection port 2 and the cavity connection end 15 are separated from the first mold 10, and the film and the second mold as the first mold 10 are separated. 12 is separated and the molded product on the film is taken out.

  In the present embodiment, as described above, during the injection of the resin 30 into the cavity 5, the amount of increase in the volume of each decompression capacity 23 connected to each outgate 13 is controlled, so that the resin 30 is injected excessively. Therefore, it is not necessary to confirm the arrival time of the resin 30 to the end point detection unit 18 in advance, so that the use efficiency of the resin 30 is good. In the present embodiment, the case where the resin 30 is an ultraviolet curable resin is exemplified, but a thermosetting resin may be used. However, in this case, in the resin curing step shown in FIG. 11, the temperature is increased until the resin 30 is cured instead of the ultraviolet irradiation. As described above, the present embodiment is suitable for molding a low-viscosity resin 30 (viscosity of 100 cP or less) such as an ultraviolet curable resin or a thermosetting resin, and controls the volume of the decompression capacity 23 to an appropriate value. Thus, since the excess resin 30 can be prevented from leaking from the gap between the film that is the first mold 10 and the second mold 12, an optical waveguide is formed on the film that is a flexible material. It is suitable for manufacturing.

DESCRIPTION OF SYMBOLS 1 Injection molding apparatus 2 Resin injection port 3 Increased volume 5 Cavity 7 Ingate 9 Flow gate 10 1st type | mold 12 2nd type | mold 13 Out gate 15 Cavity connection end part 17 Hole 18 Endpoint detection part 20 Valve 23 Decompression capacity 25 , 35 Control unit 30 Resin 33 End point signal

Claims (7)

In an injection molding apparatus for molding a resin using a mold having a cavity formed by a first mold and a second mold,
A plurality of cavity connecting ends having an outgate connectable to the cavity ;
The plurality of cavity connection ends are connected to a decompression capacity that is a volume of the decompressed space;
The injection molding apparatus , wherein the decompression capacity can be controlled independently of the decompression capacity connected to the other cavity connection end .   2. The injection molding apparatus according to claim 1, wherein the mold has a plurality of cavities, and each of the cavities has at least one connectable outgate. In the injection molding apparatus according to claim 1 or claim 2, a plurality injected the resin is in correspondence with each end-point detection unit determines that it has reached the said plurality of cavities connection ends of the front Kia Utogeto A controller that controls increase / decrease of the plurality of decompression capacities according to the arrival time of each endpoint signal that informs that the resin from the plurality of endpoint detection units has reached the cavity connection end. An injection molding device characterized by having. Using an injection molding apparatus according to claim 3, before the molding preparation step of respectively connecting Kia Utogeto to the cavity, each of said endpoint signals from the plurality of endpoint detection unit is confirmed all It performs injection of the resin, a first molding step of molding a resin, from the arrival times of the plurality of the endpoints signal from the endpoint detecting section, corresponding to the out-gates of which are connected to the cavity A decompression capacity control step for controlling increase / decrease in decompression capacity, and the resin is injected into the mold until all the endpoint signals from the plurality of endpoint detection units are confirmed, And a second molding step of molding the resin. Using an injection molding apparatus according to claim 3, endpoints before and molding preparation step of respectively connecting Kia Utogeto to the cavity, to start the injection of the resin into the cavity, the plurality of endpoints detection unit After receiving the signal, to control the increase of the pressure reducing capacity corresponding to the out gate in which the endpoint detection section that does not originate the endpoint signal is provided, the endpoint signal is confirmed all And a reduced pressure capacity control molding step of injecting the resin and molding the resin.   6. The method for manufacturing a resin molded body according to claim 4, wherein the resin is an ultraviolet curable resin or a thermosetting resin.   The method for producing a molded body of resin according to any one of claims 4 to 6, wherein the first mold is a film, and the molded body is formed on the film surface. Manufacturing method of a molded object.

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