JP2005329699A - Shaping method of energy-curable type resin, and resin shaping apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve transferability of a shaped article in shaping an energy-curable type resin. <P>SOLUTION: The shaping method of the resin comprises casting a resin 60 via a resin casting passage 26a and a gate 26b into a cavity 61 between a fixed side mirror surface piece 24 and a movable side mirror surface piece 25, and shaping the resin by pressurizing it with the movable side mirror surface piece 25 while irradiating ultraviolet rays 31a emitted from a main UV light source 31. After completion of casting the resin 60 and before pressurization with the movable side mirror surface piece 25, the resin 60 existing in the gate 26b is cured by ultraviolet rays 32a irradiated via an optical fiber 33 from a sub-UV light source 32 to clog the resin casting passage 26a and prevent the resin 60 in the cavity 61 in the vicinity of the gate 26b from being distorted due to the reverse flow of the resin in the resin casting passage 26a during pressurization. The uniform pressurization of the resin 60 in the cavity 61 produces the shaped article showing good transferability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an energy curable resin molding technique, and more particularly to a technique that is effective when applied to a resin molding technique for optical elements such as plastic lenses.

  In recent years, since it has excellent impact resistance compared to glass and the like and can be mass-produced, an optical element manufacturing technique by resin molding has been widely spread. For example, a conventional plastic lens manufacturing method includes a method of manufacturing a thermoplastic resin such as polymethyl methacrylate (PMMA) or polycarbonate (PC) by an injection molding method, and thermosetting of diethylene glycol bisallyl carbonate (CR-39). There is a method in which a heat-sensitive resin is heated and polymerized by a casting method.

  However, while the former injection molding method enables mass production in a short time, there are problems with internal homogeneity and surface transferability, while the latter casting method has good internal homogeneity and surface transferability. There is a problem that the polymerization time takes several hours to several tens of hours and the mass productivity is poor.

  As a method for solving the problem of the casting method by heat polymerization, a method for producing a plastic lens in a short time by irradiating the ultraviolet curable resin with ultraviolet rays and polymerizing and curing the ultraviolet curable resin has been proposed. .

  By the way, in the molding of a photocurable resin such as an ultraviolet curable resin, when a liquid resin is injected into a cavity in a mold and cured by light energy irradiation, the shape of the cavity is reduced as the resin contracts. Transfer defects that are not accurately reflected in the contour shape of the molded product occur.

For this reason, for example, Patent Document 1 discloses a technique for improving transfer failure by compressing a resin in a cavity.
However, in the method of compressing the resin in the cavity as in Patent Document 1, there is a technical problem that the resin flows backward from the resin inlet of the cavity during compression and distortion occurs in the vicinity of the inlet in the cavity.

If the resin is hardened to some extent to prevent this backflow and the viscosity of the resin is increased and then compressed, another technical problem is caused in that the shape accuracy deteriorates. The reason for this is that the curing reaction by light irradiation is rapid, and if the resin is cured after being cured to some extent, the partially cured resin is compressed, and the resulting molded product is distorted.
Japanese Examined Patent Publication No. 63-62373

An object of the present invention is to improve transferability of a molded product in molding of an energy curable resin.
Another object of the present invention is to improve the yield of the resin and prevent the occurrence of burrs in the molding of the energy curable resin.

  Another object of the present invention is to prevent the occurrence of distortion when the resin is compressed in the molding of the energy curable resin and to improve the shape accuracy.

A first aspect of the present invention is an energy curable resin molding method in which an energy curable resin injected into a cavity exhibiting a contour shape of a target molded product is cured by energy,
Injecting the energy curable resin into the cavity via a resin injection path;
Pressurizing the energy curable resin in the cavity after closing the resin injection path;
A method for molding an energy curable resin comprising

A second aspect of the present invention is a mold body in which a cavity exhibiting the contour shape of a target molded article is formed,
A resin injection path for injecting an energy curable resin into the cavity;
A closing means for closing the resin injection path;
Pressurizing means for pressurizing the energy curable resin in the cavity;
The resin molding apparatus containing this is provided.

A third aspect of the present invention is an energy curable resin molding method in which an energy curable resin injected into a cavity exhibiting a contour shape of a target molded product is cured by energy,
A first step of injecting the energy curable resin into the cavity;
After the first step, a second step of applying a first energy to the energy curable resin in the cavity for a first time;
A third step of pressurizing the energy curable resin in the cavity after the second step;
A fourth step of applying a second energy to the energy curable resin in the cavity for a third time at a timing when a second time has elapsed from the second step during the third step;
A method for molding an energy curable resin comprising

A fourth aspect of the present invention is an energy curable resin molding method in which an energy curable resin injected into a cavity exhibiting a contour shape of a target molded product is cured by energy,
After injecting the energy curable resin into the cavity and applying energy, when applying the energy curable resin in the cavity, the application of the energy to the energy curable resin is performed during the pressurizing. Provided is a method for molding an energy curable resin, which is stopped for an arbitrary time and then restarts the application of the energy.

A fifth aspect of the present invention is an energy curable resin molding method in which energy curable resin injected into a cavity exhibiting a contour shape of a target molded product is cured by applying energy while being compressed,
Energy curing in which the first level of energy is applied when compression of the energy curable resin in the cavity is started, and a second level of energy stronger than the first level is applied after an arbitrary time from the start of compression. A molding resin molding method is provided.

  According to the first and second aspects of the present invention described above, for example, by selectively curing only the resin at the resin inlet and closing the resin injection path, the resin in the cavity is compressed. The backflow resin of the resin from the inlet can be prevented, and the transferability of the molded product can be improved without causing distortion in the resin in the vicinity of the injection portion in the cavity.

  In addition, after the resin is injected into the cavity, for example, the resin flow path for injecting the resin into the cavity is mechanically closed, and then the resin in the cavity is compressed to prevent the resin from flowing back from the resin injection port. It is possible to improve the transferability of the molded product without causing distortion in the resin near the resin injection portion of the cavity.

  In addition, according to the third and fourth aspects of the present invention described above, the first energy is given to the energy curable resin for a predetermined time prior to the pressurization during curing, so that the resin in the cavity is somewhat removed. The resin is leaked to the mating surface of the mold that forms the cavity when the resin in the cavity is pressurized by applying pressure and applying the second energy again. Generation of burr and back flow of the resin can be prevented, and distortion of the molded product accompanying compression can be reduced.

  In addition, according to the fifth aspect of the present invention described above, for example, when performing compression molding of an energy curable resin, the energy intensity applied to the energy curable resin during compression is reduced, and then the energy intensity is increased. As a result, it is possible to reduce quality variations caused by variations in compression timing and the like, with little sacrifice in cycle time (required molding time).

According to the present invention, transferability of a molded product can be improved in molding of an energy curable resin.
Further, in the molding of the energy curable resin, it is possible to improve the yield of the resin and prevent the occurrence of burrs.

  Further, in the molding of the energy curable resin, it is possible to prevent the occurrence of distortion when compressing the resin and to improve the shape accuracy.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of the configuration of a resin molding apparatus that performs an energy curable resin molding method according to an embodiment of the present invention, and FIG. 2 shows an example of the configuration of its control system. FIG. 3 is a block diagram showing an example of the operation.

  The molding apparatus according to the present embodiment supplies a mold 20, a molding mechanism 10 that drives the mold 20, a light irradiation mechanism 30 that applies light energy to the mold 20, and a resin 60 to the mold 20. A resin supply mechanism 40 and a controller 50 that controls the entire molding apparatus are provided.

  The molding mechanism 10 includes a fixed platen 11, a movable platen 12 that faces the fixed platen 11, a platen drive mechanism 13 that drives the movable platen 12, and a movable mirror piece 25 of a mold 20 to be described later. A pressurizing mechanism 14 for driving is provided.

  The mold 20 includes a fixed-side specular piece 24 and a movable-side specular piece 25 that constitute a cavity 61. The fixed-side specular piece 24 is made of, for example, quartz glass that is transparent to ultraviolet rays 31a emitted from a main UV light source 31 to be described later, is fitted to the fixed-side mold plate 23, and is supported at the periphery. It is fixed to the fixed side platen 11 via the fixed side receiving plate 22 and the fixed side mounting plate 21.

  The movable mirror piece 25 is made of steel or the like, and is supported so as to be freely displaceable in a direction facing the fixed mirror piece 24 (hereinafter referred to as an axial direction) with respect to the movable mold plate 26, The movable side platen 12 is supported by the movable side receiving plate 27, the spacer block 28 and the movable side mounting plate 29.

  The facing surfaces of the fixed-side mirror surface piece 24 and the movable-side mirror surface piece 25 are precisely mirror-polished so as to form a cavity 61 that exhibits the contour shape of the target molded product in a clamped state. In the case of the present embodiment, the shape of the cavity 61 is set so that a meniscus lens is obtained as a molded product.

  A pressurizing pin 25a is fixed to the back side of the movable mirror surface piece 25, and the pressurizing pin 25a is connected to a pressurizing rod 25c via a pressurizing plate 25b. It protrudes to the outside through a rod opening 29a provided on the movable side mounting plate 29 and a rod opening 12a provided on the movable side platen 12, and the outer end of the pressurizing rod 25c is constituted by a servo motor, a hydraulic cylinder or the like. The pressurizing mechanism 14 is fixed.

  The movable side receiving plate 27 is provided with a plurality of pressurizing plate guide pins 27a arranged so as to surround the pressurizing pin 25a, and the pressurizing plate guide pins 27a are provided with a pressurizing plate guide provided on the pressurizing plate 25b. The bush 25d is inserted.

  Thereby, the pressurizing pin 25a and the pressurizing rod 25c fixed to the pressurizing plate 25b are smoothly displaced in the axial direction, and the thrust of the pressurizing mechanism 14 is transmitted to the movable side specular piece 25, so that the movable side The configuration is such that the pressure of the resin 60 injected into the cavity 61 is smoothly performed by the change in the volume of the cavity 61 due to the axial displacement of the mirror piece 25.

  Between the pressurizing plate 25b and the movable side receiving plate 27, a return spring 27b into which each pressurizing plate guide pin 27a is inserted is provided, and the pressurizing rod 25c is moved in a direction to separate the pressurizing plate 25b from the movable side receiving plate 27. Is always energized.

  The opposed surface of the movable side mold plate 26 facing the fixed side mold plate 23 communicates with a cavity 61 constituted by the fixed side specular piece 24 and the movable side specular piece 25 in a clamped state where both are in close contact. A groove serving as a resin injection path 26a and a gate part 26b is formed, and the resin 60 is injected from the outside into the cavity 61 through the resin injection path 26a and the gate part 26b.

  A plurality of guide pins 26 c project from a surface of the movable side mold plate 26 facing the fixed side mold plate 23 at a position surrounding the movable side specular piece 25, and the guide pins 26 c are provided on the fixed side mold plate 23. A plurality of guide bushes 23a provided correspondingly are fitted in the axial direction and are slidably guided in the axial direction. Thereby, the movable side specular piece 25 supported by the movable side mold plate 26 and the fixed side specular piece 24 supported by the fixed side mold plate 23 are within a plane intersecting the displacement direction of the movable side specular piece 25. Accurate positioning.

  The resin supply mechanism 40 includes a syringe 41 having a needle 42 inserted into the resin injection path 26 a and a dispenser 44 that sends pressurized gas to the syringe 41 through a tube 43. Then, the resin 60 stored in the syringe 41 is pressurized with pressurized gas fed from the dispenser 44, whereby the resin 60 is injected into the cavity 61. Further, ON / OFF of the injection of the resin 60 and the flow rate are controlled by the pressure of the pressurized gas supplied from the dispenser 44 and the pressurization time.

  The light irradiation mechanism 30 includes a main UV light source 31 composed of a high-pressure mercury lamp, a metal halide lamp, etc., a sub UV light source 32 composed of an LED, an ultraviolet laser, an ultraviolet lamp, etc., and an irradiation time (ON / OFF) of each of these. ), UV controller 34 for controlling illuminance (power) and the like.

  The main UV light source 31 has a light source opening 11a that opens at the center of the fixed side platen 11 and the fixed side mounting plate 21 on the back side of the fixed side specular piece 24, and an ultraviolet ray 31a exit opening inside the light source opening 21a. The piece 24 is accommodated toward the back. Then, the ultraviolet rays 31 a emitted from the main UV light source 31 pass through the fixed side mirror piece 24 that is transparent to the ultraviolet rays 31 a and are applied to the resin 60 in the cavity 61.

  The sub UV light source 32 is provided outside the mold 20, and one end of the optical fiber 33 is connected to the exit of the sub UV light source 32, and the other end of the optical fiber 33 is connected to the fixed side platen 11, the fixed side mounting plate 21, and the fixed side. The side receiving plate 22 and the fixed side specular piece 24 pass through, and are opened to a position facing a resin injection path 26 a communicating with the cavity 61 and a gate portion 26 b which is a connection portion of the cavity 61. The emitted ultraviolet light 32a is selectively irradiated onto the resin 60 existing in the gate portion 26b.

  As illustrated in FIG. 2, each part of the molding mechanism 10, the mold 20, the light irradiation mechanism 30, the resin supply mechanism 40, and the like is connected to the control device 50 via the control line 50 a, thereby It is controlled by the control device 50, and resin molding is performed by a series of cooperative operations described later. For simplicity, FIG. 2 shows an opening / closing controller 73 and the like which will be described later together with the UV controller 34, but either one may be used.

Hereinafter, an example of the operation of the present embodiment will be described.
First, from a state where the fixed side mold plate 23 and the movable side mold plate 26 are separated from each other, the movable side platen 12 moves forward, and mold clamping is performed so that the movable side mold plate 26 is brought into close contact with the fixed side mold plate 23. A cavity 61 is formed between the piece 24 and the movable side specular piece 25. At this time, the movable-side mirror piece 25 is in a position where the back surface abuts on the movable-side receiving plate 27 by the urging force of the return spring 27b.

  Thereafter, a signal indicating completion of mold clamping is sent from the control device 50 to the dispenser 44, and the dispenser 44 sends pressurized gas to the syringe 41 in response to this signal. Thereby, the injection of the resin 60 into the cavity 61 is started. When the set time has elapsed and the injection is completed, the dispenser 44 stops the application of the pressurized gas to the syringe 41, and sends a filling completion signal to the UV. Send to controller 34.

  In response to this, the UV controller 34 first turns on the sub UV light source 32 and irradiates the resin 60 existing in the gate portion 26b in the resin injection path 26a with the ultraviolet rays 32a for a set time with the set illuminance. The resin injection path 26 a is closed with the cured resin 60, and a closing completion signal is transmitted to the control device 50. Next, the UV light 31 a having the illuminance set by turning on the main UV light source 31 is transmitted through the fixed mirror piece 24 and irradiated onto the resin 60.

  Upon receiving the injection completion signal from the dispenser 44 and the occlusion completion signal from the UV controller 34, the control device 50 operates the pressurizing mechanism 14 after a set time and pressurizes the pressurizing rod 25c, the pressurizing plate 25b, and the pressurizing pin. By applying an axial thrust to the movable mirror piece 25 against the return spring 27b via 25a, the movable mirror piece 25 moves forward by a predetermined distance in a direction approaching the fixed mirror piece 24, The resin 60 in the cavity 61 is pressurized and the position is maintained.

  At this time, in the case of the present embodiment, the gate portion 26b of the resin injection passage 26a is closed as described above prior to the pressurization due to the displacement of the movable mirror piece 25. The resin 60 in the vicinity of the gate portion 26b is prevented from flowing back to the resin injection path 26a. Therefore, the resin 60 near the gate portion 26b in the cavity 61 is reliably prevented from being partially distorted by the applied pressure, and the entire resin 60 inside the cavity 61 is uniformly compressed.

  Thereafter, when the irradiation time set in the UV controller 34 has elapsed, the main UV light source 31 and the sub UV light source 32 are turned off, a curing completion signal is sent from the UV controller 34 to the control device 50, and the pressurizing rod 25c moves backward. Then, after the pressurized state by the movable side mirror piece 25 is released, the movable side platen 12 moves backward by a predetermined distance.

  Thereafter, the pressurizing mechanism 14 moves the pressurizing rod 25c forward and displaces the movable side specular piece 25 in a direction protruding from the die mating surface of the movable side mold plate 26, so that the molded product becomes movable side specular piece 25 and It peels from the movable side mold plate 26 and is taken out.

Thereafter, the pressurizing rod 25c moves backward, and the movable platen 12 moves forward again to start the next molding step.
As described above, in this embodiment, after the resin 60 is injected into the cavity 61, the resin 60 existing in the gate portion 26b of the resin injection path 26a is cured and the resin injection path 26a is closed before the pressurization of the cavity 61 is performed. Thereafter, the resin 60 is pressurized, so that the resin 60 in the vicinity of the gate portion 26b in the cavity 61 is prevented from flowing back to the resin injection path 26a, and the resin 60 in the vicinity of the gate portion 26b in the cavity 61 is supplied. Partial distortion due to the pressure is surely prevented, and the entire resin 60 inside the cavity 61 is uniformly compressed. Thereby, the contour shape of the cavity 61 is faithfully transferred to the resin 60, and the transferability of a molded product such as a plastic lens formed by curing the resin 60 in the cavity 61 is improved. As a result, a plastic lens having high-precision optical characteristics can be obtained.

  In the above description, the case where the resin injection path 26a is closed by curing the resin 60 of the gate portion 26b has been described as an example. However, as illustrated in FIG. 4, the resin injection path 26a is mechanically used. May be occluded.

  FIG. 4 is a plan view of the movable mold plate 26 viewed from the fixed mold plate 23 side in the configuration illustrated in FIG. In this case, instead of the optical fiber 33, an opening / closing mechanism 70 for opening / closing the gate portion 26b is provided. That is, the opening / closing mechanism 70 is mounted on the movable side mold plate 26, and opens / closes pins 71 that open / close the gate portion 26b, a pin driving mechanism 72 that drives the opening / closing pins 71, and an opening / closing that controls the operation of the pin driving mechanism 72. The controller 73 is configured. As shown in FIG. 2 described above, the open / close controller 73 is connected to the control device 50 via the control line 50 a and operates under the control device 50.

  Then, after the injection of the resin 60 into the cavity 61 is completed, the gate portion 26b of the resin injection path 26a is closed by the opening / closing pin 71 prior to the pressurization by the movable side specular piece 25. This provides an advantage that the gate portion 26b can be closed more reliably by the opening / closing pin 71 having high rigidity.

5 and 6 are diagrams showing an example of a method for molding an energy curable resin according to another embodiment of the present invention.
In this embodiment, the molding apparatus illustrated in FIG. 1 can be used, but the closing mechanism for the gate portion 26b of the resin injection path 26a may be omitted.

  In the molding of the resin 60, when the irradiation of the ultraviolet ray 31a and the pressurization in the cavity 61 due to the displacement of the movable mirror piece 25 are used in combination, from the start of the irradiation of the ultraviolet ray 31a to the start of pressurization, as shown in FIG. When the elapsed time is changed and the occurrence of burr and the shape accuracy are observed, the burr becomes good (decreased) because the fluidity of the resin 60 decreases with the elapsed time. Moreover, the backflow to the resin injection path 26a is also reduced. Conversely, the shape accuracy deteriorates with the elapsed time. This is considered to be because the pressurizing operation does not contribute to the improvement of the shape accuracy even if the resin 60 that has been cured and contracted to a certain degree or more by irradiation with the ultraviolet rays 31a is pressurized.

Thus, since the characteristics with respect to the elapsed time of irradiation are reversed, as shown in FIG. 5, there is an irradiation time t1 that achieves both reduction of burrs and prevention of backflow and improvement of shape accuracy.
Therefore, in the present embodiment, as illustrated in FIG. 6, the irradiation of the ultraviolet rays 31 a and the pressurization of the resin 60 by the movable side specular piece 25 are controlled.

  That is, after the injection of the resin 60 into the cavity 61 is completed, the irradiation is stopped by irradiating the ultraviolet ray 31a-1 (first energy) for the irradiation time t1 (first time, for example, 3 to 10 seconds), and then movable. The pressurization of the resin 60 in the cavity 61 due to the displacement of the side mirror piece 25 is started, and the ultraviolet ray 31a-2 (second energy) is again applied only for t3 (third time, for example, 90 to 120 seconds) before the pressurization is stopped. The operation to irradiate is performed. That is, after the injection is completed, after irradiation with the ultraviolet ray 31a-1 for t1 before pressurization, during the pressurization, the irradiation is stopped for t2 (second time, for example, 10 to 20 seconds), and t3 before pressurization is completed. Only once again, the control device 50 controls the above-described units so that the ultraviolet rays 31a-2 are irradiated.

  In this case, if necessary, the illuminance of the ultraviolet ray 31a-1 at the previous irradiation time t1 is made smaller than the illuminance of the ultraviolet ray 31a-2 at the subsequent irradiation time t3. Thereby, in the first irradiation of the ultraviolet rays 31a-1, there is an advantage that the curing rate of the resin 60 is slowed to reduce the curing unevenness in the resin 60 and the transfer unevenness due to the subsequent pressurizing operation can be reduced.

In this way, when the ultraviolet irradiation is resumed after waiting for a certain time from the completion of the compression operation, the deviation of the internal pressure distribution of the cavity 61 is reduced, and the shape accuracy can be further improved.
As a result, the resin 60 in the cavity 61 is cured to a certain extent, and the curing is temporarily stopped and then compressed, so that burrs and back flow of the resin during compression can be prevented and distortion of the molded product due to compression is reduced. Can be made.

  As a result, the accuracy of a product such as a plastic lens as a molded product can be improved. Further, the amount of the resin 60 that is lost as a burr is reduced, and the yield of the resin 60 is improved.

  In the example of FIG. 6 described above, the case where the irradiation of the ultraviolet ray 31a is stopped during the irradiation time t1 from the start of the compression is illustrated. However, a modification example in which the relatively weak ultraviolet ray 31a-3 is irradiated during the irradiation time t1. Will be described with reference to the diagram of FIG.

That is, as illustrated in FIG. 7, after the injection of the resin 60 into the cavity 61 is completed, the ultraviolet ray 31a-1 having an illuminance I ₃ (third level) is irradiated for an irradiation time t1 (for example, 3 to 10 seconds). Thereafter, pressurization of the resin 60 in the cavity 61 due to the displacement of the movable mirror piece 25 is started while irradiating the ultraviolet ray 31a-3 having the illuminance I ₁ (first level) smaller than the illuminance I _3. The irradiation with the small illuminance I ₁ is continued for t2 (for example, 10 to 20 seconds) from the start, and the illuminance I that is larger than the illuminance I ₁ for t3 (for example, 90 to 120 seconds) before the pressurization is stopped. _The operation of irradiating 2 ultraviolet rays 31a-2 is performed.

That is, after the injection is completed, the ultraviolet ray 31a-1 having the illuminance I ₃ is irradiated for the period of t1 before the pressurization, and then the ultraviolet ray 31a-3 reduced to the illuminance I ₁ is irradiated for the period of t2 from the start of the pressurization. only t3 period before pressurization completion, so as to perform irradiation of ultraviolet rays 31a-2 of the illuminance I _2, the controller 50 controls the above respective units.

The illuminance I ₃ of the ultraviolet ray 31a-1 irradiated in the period t1 before pressurization is 5 to 10 times the illuminance I ₁ of the ultraviolet ray 31a-3 irradiated in the period t2 after the pressurization starts, illuminance I ₂ of ultraviolet 31a-2 which is irradiated to t3 period before pressurization completion is 5 to 10 times the intensity I _1. Further, the illuminance I ₃ of the ultraviolet ray 31a-1 is smaller than the illuminance I ₂ of the ultraviolet ray 31a-2.

  As described above, in the modified example of FIG. 7, as in the case of FIG. 6 described above, the resin 60 in the cavity 61 is cured to some extent by irradiation with the ultraviolet rays 31 a-1, and after the curing speed is reduced, the resin 60 is removed. By compressing, the burr at the time of compression and the back flow of the resin 60 can be prevented, and when the resin 60 is compressed, the ultraviolet ray 31a-3 having a small illuminance is irradiated to suppress the curing speed, thereby preventing the burr and improving the shape accuracy. Both effects of improvement can be secured stably.

Further, in the case of the modification of FIG. 7, when the resin 60 is compression-molded, the resin 60 is cured to some extent while reducing the energy intensity (illuminance I ₁ ) at the time of compression, and the energy intensity before and after the curing. By increasing (illuminance I ₃ , illuminance I ₂ ), quality variations caused by variations in compression timing and the like can be reduced with almost no sacrifice in cycle time (time required for molding).

  That is, when the curing speed of the resin 60 is high, the compression timing that achieves both prevention of burrs and improvement in shape accuracy, as illustrated in FIG. is there.

Therefore, in the modified example of FIG. 7, the curing proceeds while suppressing the curing rate by decreasing the illuminance of the ultraviolet ray 31a-3 (illuminance I ₁ ) for a certain time (t2) during the compression of the resin 60, and before and after that. By performing molding with increasing illuminance such as ultraviolet ray 31a-1 (illuminance I ₃ ) and ultraviolet ray 31a-2 (illuminance I ₂ ), it is possible to prevent burrs by preliminary curing by irradiation with ultraviolet ray 31a-1. By realizing the effect of improving the shape accuracy and promoting curing by irradiation with the ultraviolet ray 31a-2, the cycle time of the molding process of the resin 60 (resin injection time, t1, t2, t3 and mold release (removal) time) Etc.) can be shortened, and excellent quality can be obtained efficiently (high throughput) and stably.

It is a schematic sectional drawing which shows an example of the structure of the resin molding apparatus which enforces the molding method of the energy curable resin which is one embodiment of this invention. It is a block diagram which shows an example of a structure of the control system. It is a diagram which shows an example of the effect | action. It is a top view which shows the modification of the resin molding apparatus which enforces the molding method of the energy curable resin which is one embodiment of this invention. It is a diagram which shows an example of the shaping | molding method of energy curable resin which is other embodiment of this invention. It is a diagram which shows an example of the shaping | molding method of energy curable resin which is other embodiment of this invention. It is a diagram which shows an example of the shaping | molding method of the energy curable resin which is further another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Molding mechanism 11 Fixed side platen 11a Light source opening part 12 Movable side platen 12a Rod opening part 13 Platen drive mechanism 14 Pressurizing mechanism 20 Mold 21 Fixed side mounting plate 21a Light source opening part 22 Fixed side receiving plate 23 Fixed side mold plate 23a Guide bush 24 Fixed side specular piece 25 Movable side specular piece 25a Pressure pin 25b Pressure plate 25c Pressure rod 25d Pressure plate guide bush 26 Movable side plate 26a Resin injection path 26b Gate portion 26c Guide pin 27 Movable side receiving plate 27a Pressure plate guide pin 27b Return spring 28 Spacer block 29 Movable attachment plate 29a Rod opening 30 Light irradiation mechanism 31 Main UV light source 31a Ultraviolet 31a-1 Ultraviolet 31a-2 Ultraviolet 31a-3 Ultraviolet 32 Sub UV light source 32a Ultraviolet 33 Optical fiber 34 UV controller 40 Resin supply Mechanism 41 Syringe 42 Needle 43 Tube 44 Dispenser 50 Control device 50a Control line 60 Resin 61 Cavity 70 Opening and closing mechanism 71 Opening and closing pin 72 Pin drive mechanism 73 Opening and closing controller t1 Irradiation time t2 Irradiation stop time or illuminance reduction time t3 Irradiation time

Claims (15)

An energy curable resin molding method in which energy curable resin injected into a cavity exhibiting a contour shape of a target molded product is cured by energy,
Injecting the energy curable resin into the cavity via a resin injection path;
Pressurizing the energy curable resin in the cavity after closing the resin injection path;
A method for molding an energy curable resin, comprising:   2. The energy curable resin molding method according to claim 1, wherein the energy curable resin existing in the resin injection path is cured before the energy curable resin in a cavity to close the resin injection path. And then pressurizing the energy curable resin in the cavity to form an energy curable resin.   2. The method of molding an energy curable resin according to claim 1, wherein the energy curable resin in the cavity is pressurized after mechanically closing the resin flow path. . A mold body in which a cavity exhibiting a contour shape of a target molded article is formed;
A resin injection path for injecting an energy curable resin into the cavity;
A closing means for closing the resin injection path;
Pressurizing means for pressurizing the energy curable resin in the cavity;
The resin molding apparatus characterized by including.   5. The resin molding apparatus according to claim 4, wherein the blocking means is a light that blocks the resin injection path by irradiating the energy curable resin existing in the resin injection path with light energy and selectively curing the resin. A resin molding apparatus comprising an irradiation mechanism.   5. The resin molding apparatus according to claim 4, wherein the closing means includes an opening / closing mechanism that enters and exits the resin injection path to open and close the resin injection path.   The resin molding apparatus according to any one of claims 4 to 6, wherein the mold body includes a piece member that constitutes a part of the cavity and a mold member that supports the piece member in a displaceable manner. The resin molding apparatus is characterized in that the energy curable resin in the cavity is pressurized by displacing the piece member. An energy curable resin molding method in which energy curable resin injected into a cavity exhibiting a contour shape of a target molded product is cured by energy,
A first step of injecting the energy curable resin into the cavity;
After the first step, a second step of applying a first energy to the energy curable resin in the cavity for a first time;
A third step of pressurizing the energy curable resin in the cavity after the second step;
A fourth step of applying a second energy to the energy curable resin in the cavity for a third time at a timing when a second time has elapsed from the second step during the third step;
A method for molding an energy curable resin, comprising:   9. The method of molding an energy curable resin according to claim 8, wherein the strength of the first energy is smaller than the strength of the second energy.   10. The method of molding an energy curable resin according to claim 8 or 9, wherein the energy is ultraviolet light, and the illuminance of the ultraviolet light as the second energy is smaller than the illuminance of the ultraviolet light as the first energy. The method for molding an energy curable resin, wherein the energy curable resin is an ultraviolet curable resin. An energy curable resin molding method in which energy curable resin injected into a cavity exhibiting a contour shape of a target molded product is cured by energy,
After injecting the energy curable resin into the cavity and applying energy, when applying the energy curable resin in the cavity, the application of the energy to the energy curable resin is performed during the pressurizing. A method for molding an energy curable resin, which is stopped for an arbitrary time and then restarts the application of the energy. An energy curable resin molding method in which energy curable resin injected into a cavity exhibiting a contour shape of a target molded product is cured by applying energy while being compressed,
Applying the first level of energy when starting compression of the energy curable resin in the cavity, and applying the second level of energy stronger than the first level after an arbitrary time from the start of compression. A method for molding an energy curable resin, which is characterized. In the molding method of the energy curable resin according to claim 12,
The method of molding an energy curable resin, wherein the intensity of the energy at the second level is 5 to 10 times the intensity of the energy at the first level. In the molding method of the energy curable resin according to claim 12,
Prior to the start of compression, the energy of a third level stronger than the first level is applied to the energy curable resin in the cavity. In the molding method of the energy curable resin according to claim 14,
The method of molding an energy curable resin, wherein the intensity of the energy at the third level is 5 to 10 times the intensity of the energy at the first level.

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