JP2019006017A - Molding apparatus and method of molding resin molded article - Google Patents

Abstract

To provide a molding apparatus and a method for molding a resin molded article with a simple structure and capable of suppressing a situation where a liquid resin penetrates into an opening part.SOLUTION: A molding apparatus 20 has an upper mold 24 and a lower mold 21 that form a cavity 26 by mutual mold closing, with the upper mold 24 and the lower mold 21 having an opening part 22 opening at least on a molding surface 21A of the lower mold 21, an elastic member 30 that is elastically deformable in a diameter-reducing direction and is accommodated in the opening part 22 to hermetically seal the opening part 22, a resin injecting part 40 for injecting a liquid thermosetting resin 45 into the cavity 26 in a state where the opening part 22 is sealed by the elastic member 30, and an extrusion pin 50 that releases a resin molded article 10 formed by solidifying the liquid thermosetting resin 45 injected into the cavity 26 from the lower mold 21 by extruding the elastic member 30 from the molding surface 21A. The elastic member 30 adheres to the resin molded article 10 so that it can be separated from the extrusion pin 50.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a molding apparatus and a molding method for a resin molded product.

  Conventionally, a molding apparatus disclosed in Patent Document 1 below is known. In the configuration disclosed in Patent Document 1, fiber reinforced plastic is extruded by an operable ejector pin housed in a mold or a cylinder installed in the mold, and a gap is provided between the fiber reinforced plastic and the mold. Further, it is disclosed that gas is fed into a gap to take out a fiber reinforced plastic from a mold.

JP 2009-202440 A

  However, in the configuration disclosed in Patent Document 1, since the ejector pin is retracted from the molding surface and accommodated in the molding die or the cylinder, the axial position accuracy of the ejector pin is required. Furthermore, it is necessary to provide a clearance in order to easily accommodate the ejector pins, or to increase the taper of the outer peripheral surface. Therefore, the molding apparatus must have a complicated structure.

  In addition, depending on the accuracy of the ejector pin shaft position and the clearance and taper size described above, there may be a gap around the ejector pin and liquid resin may enter the mold or inside the cylinder (its opening). ,There's a problem.

  The technology disclosed in this specification has been completed based on the above-described circumstances, and has a simple structure and a molding apparatus and a resin molding capable of suppressing a situation where a liquid resin enters the opening. An object is to provide a method for forming a product.

  The molding apparatus disclosed in the present specification is a pair of molds that form cavities by closing the molds, and a pair of molds having an opening that opens on a molding surface of at least one mold An elastic member that can be elastically deformed in a diameter-reducing direction, the elastic member being housed in the opening and sealing the opening, and the opening being sealed by the elastic member in the cavity. A resin injection part for injecting a liquid resin and a resin molded product obtained by solidifying the liquid resin injected into the cavity from the one mold by extruding the elastic member from the molding surface An extruding pin configured to release the mold, and the elastic member is configured to be separable from the extruding pin by adhering to the resin molded product.

  According to the technique disclosed in this specification, the elastic member is configured to be separable from the push pin. For example, the opening is sealed so that the member that seals the open portion cannot be separated from the push pin. The member need not be accommodated in the opening as the push pin is retracted from the molding surface. For this reason, when the elastic member is accommodated in the opening, the accuracy of the axial position of the push pin does not matter, and the clearance for easily accommodating the elastic member in the opening and the taper of the outer peripheral surface are increased. There is no need. For this reason, it is possible to reliably seal the opening with the elastic member with a simple structure and to prevent the liquid resin from entering the opening.

  The said structure WHEREIN: The said elastic member may have the recessed part recessedly provided in the surface by the side of the said cavity. According to such a configuration, the elastic member can be easily attached to the resin molded product by filling the liquid resin in the recess and solidifying. As a result, the elastic member can be reliably separated from the push pin.

  In the above configuration, the opening is formed in a surface having a height difference in the extrusion direction of the extrusion pin in the molding surface, and the elastic member has a shape in which the surface on the cavity side follows the molding surface. And a fitting portion that is recessed or protruded in the pushing direction at a position that is unevenly distributed from the center of the opening on the surface that is pushed by the pushing pin, and the pushing pin is fitted to the fitting pin. You may have the fitting part fitted to the said extrusion direction with respect to a joint part. According to such a configuration, when the elastic member is accommodated in the opening, the fitted portion of the elastic member and the fitting portion of the push pin are fitted, so that the direction of the elastic member is changed to the opening. In the circumferential direction. For this reason, even when the elastic member is separated from the extrusion pin, the elastic member can be accommodated in the opening in the normal direction, and the resin molding has a height difference in the extrusion direction on the cavity side surface of the elastic member. The shape of the product can be reliably molded.

  Further, a method for molding a resin molded product disclosed in the present specification is a molding method for molding the resin molded product using the molding apparatus described above, and solidifies the liquid resin injected into the cavity. Then, by molding the resin molded product and attaching the elastic member to the resin molded product, opening the pair of molding dies, and extruding the elastic member from the molding surface, A mold release step for releasing the resin molded product from the one mold, and the elastic member attached to the resin molded product from the extrusion pin by paying out the resin molded product from the pair of molds. Separating step of separating. According to such a configuration, in addition to the same effects as described above, in the separation process, the elastic member is separated from the push pin by dispensing the resin molded product from the pair of molds, and is taken out from the pair of molds. This is preferable.

  The said structure WHEREIN: The resin injection molding method for shape | molding the said resin molded product which consists of fiber reinforced resin may be sufficient. With such a configuration, it is possible to suitably suppress resin leakage from the opening in a molding method that is likely to cause resin leakage, such as the resin injection molding method.

  According to the technology disclosed in this specification, it is possible to provide a molding apparatus and a method for molding a resin molded product that can suppress a situation in which a liquid resin enters the opening with a simple structure.

Sectional drawing which shows the shaping | molding apparatus at the time of the elastic member arrangement | positioning process and fiber base material arrangement | positioning process which concern on Embodiment 1. Sectional drawing which shows the shaping | molding apparatus at the time of a negative pressure provision process Sectional drawing which shows the shaping | molding apparatus at the time of a resin injection | pouring process and a solidification process Sectional drawing which shows the shaping | molding apparatus at the time of mold opening in a mold release process Sectional drawing which shows the shaping | molding apparatus at the time of extrusion in a mold release process Sectional view showing the molding device during the separation process Sectional view showing resin molded product and elastic member Enlarged sectional view showing elastic member, push pin, and opening The expanded sectional view which shows the elastic member which concerns on Embodiment 2, an extrusion pin, and an opening part The expanded sectional view which shows the elastic member which concerns on Embodiment 3, an extrusion pin, and an opening part

<Embodiment 1>
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 8. In the present embodiment, a resin molded product 10 made of a fiber reinforced resin, a molding apparatus 20 for molding the resin molded product 10, and a method for manufacturing the resin molded product 10 are illustrated.

  As shown in FIG. 7, the resin molded product 10 is a plate-like member having a main plate portion 11 and a flange portion 12 that rises from the outer peripheral end portion of the main plate portion 11 toward the back surface 10 </ b> B. The resin molded product 10 is a board member used for a vehicle seat or a vehicle interior material. A board member mounted on such a vehicle is a member that is required to be light and secure its rigidity. From such a viewpoint, a fiber reinforced resin is preferably used.

  As shown in FIG. 7, the resin molded product 10 includes a reinforcing fiber sheet 14 and a resin portion 16 made of a thermosetting resin that is cured after being impregnated in the reinforcing fiber sheet 14. The reinforcing fiber sheet 14 is made of a carbon fiber fabric. As the resin part 16, an epoxy resin etc. can be illustrated, for example. 1 to 3, a carbon fiber fabric in a state before the impregnated resin portion 16 is cured is shown as a fiber base material 14P.

  Then, the shaping | molding apparatus 20 of this embodiment is demonstrated. The molding apparatus 20 includes a lower mold 21 and an upper mold 24, which are a pair of molds that form the cavity 26, an elastic member 30, a resin injection unit 40, an extrusion pin 50, and a negative pressure application unit 60. Yes.

  As shown in FIGS. 1 and 2, the lower die 21 and the upper die 24 can be opened and closed with each other, and the cavity 26 is formed by closing the die. The lower mold 21 mainly molds the back surface 10B side of the resin molded product 10, and has a shape in which the central portion of the molding surface 21A is raised in a convex shape. On the other hand, the upper mold 24 mainly molds the design surface 10A side of the resin molded product 10, and has a shape in which the central portion of the molding surface 24A is recessed in a concave shape. The lower mold 21 is provided with a seal member 28 along the outer peripheral edge of the cavity 26, and is configured to be able to seal with the upper mold 24 in a state where the mold is closed.

  The lower mold | type 21 has the opening part 22 opened to 21A of shaping | molding surfaces, as FIG. 8 shows. The opening 22 is formed in a bottomed concave shape having a circular shape in plan view, and accommodates the elastic member 30 therein, and is configured such that the push pin 50 advances and retreats from the bottom surface 22B. The opening 22 has a slight taper on its inner peripheral surface 22A. The taper is smaller than the size set when the member for sealing the opening 22 is accommodated in the opening 22 as the push pin 50 is retracted from the molding surface 21A. A plurality of openings 22 are provided in a distributed manner on the molding surface 21 </ b> A according to the size of the resin molded product 10 and the magnitude of the force required to release it. 1 to 6 exemplify two openings 22 among the plurality of openings 22.

  As shown in FIG. 8, the elastic member 30 is configured to be elastically deformable in the reduced diameter direction, and is configured to be accommodated in the opening 22 and to seal the opening 22. The elastic member 30 has a cylindrical shape having an outer diameter substantially the same as the inner diameter of the opening 22. In the present embodiment, the elastic member 30 is made of a synthetic rubber excellent in heat resistance and wear resistance. The outer peripheral surface 31 of the elastic member 30 has the same taper as the outer peripheral surface 31 of the opening 22. When the elastic member 30 is housed in the opening 22, the upper surface 32 thereof is flush with the molding surface 21A. The elastic member 30 is configured to be elastically deformed in the reduced diameter direction, and the outer peripheral surface 31 is in close contact with the inner peripheral surface 22A of the opening 22 by an elastic force.

  As shown in FIG. 6, the elastic member 30 is configured to be separable from the push pin 50 by adhering to the resin molded product 10. In the present embodiment, the elastic member 30 has a recess 35 that is recessed in the upper surface 32 (surface on the cavity 26 side). The concave portion 35 has a reverse taper, and the liquid thermosetting resin 45 filled therein is cured and prevented from coming out of the concave portion 35, so that the elastic member 30 adheres to the resin molded product 10. Has the ability to increase power. The elastic member 30 is not attached to the extrusion pin 50, and the lower surface 33 of the elastic member 30 is arranged so as to face the upper end surface 50A of the extrusion pin 50 at a molding position of the extrusion pin 50 described later. Is done. The elastic member 30 is separable from the push pin 50 along the push direction of the push pin 50.

  As shown in FIG. 3, the resin injection part 40 is configured to inject a liquid thermosetting resin 45 into the cavity 26 in a state where the opening 22 is sealed by the elastic member 30. In the present embodiment, a liquid thermosetting resin 45 accommodated in a tank 43 is used as the resin injection part 40 in the cavity 26 through the resin injection hole 41 formed in the upper mold 24 at a predetermined injection pressure. An example of pressure injection is shown below.

  As shown in FIGS. 4 and 5, the extruding pin 50 extrudes the elastic member 30 from the molding surface 21A of the resin molded product 10 in which the liquid thermosetting resin 45 injected into the cavity 26 is solidified. Thus, it is configured to release from the lower mold 21. The push pin 50 is a rod-like member extending in the vertical direction, and is housed in a pin housing hole 51 formed in the lower mold 21 so as to be able to advance and retreat. The pin accommodating hole 51 has a predetermined clearance with respect to the push pin 50 and is formed so as to communicate with the bottom surface 22 </ b> B of the opening 22. An actuator 53 (such as an air cylinder or a hydraulic cylinder) is attached to the push pin 50 at the lower end. The push pin 50 is movable in the vertical direction with respect to the lower mold 21 with the upper direction being the push direction. The push pin 50 has a molding position in which the upper end surface 50A is retracted downward from the bottom surface 22B of the opening 22, and an extrusion position in which the upper end surface 50A is advanced upward from the molding surface 21A by moving upward from the molding position. It is possible to displace between.

  As shown in FIG. 2, the negative pressure applying unit 60 is configured to exhaust the gas in the cavity 26 to make the inside of the cavity 26 have a negative pressure. In the present embodiment, the negative pressure applying unit 60 is exemplified by exhausting the gas in the cavity 26 through the exhaust hole 61 formed in the upper die 21 by the vacuum pump 63. The negative pressure applying unit 60 is provided with a valve 65 that can be opened and closed.

  Then, the shaping | molding method of the resin molded product 10 of this embodiment is demonstrated. The molding method of the resin molded product 10 includes: an elastic member mounting step in which the elastic member 30 is mounted in the opening 22; a fiber base material arranging step in which the fiber base material 14P is disposed; and the upper mold 24 and the lower mold 21 are closed. Thus, a negative pressure applying step for making the inside of the cavity 26 negative, a resin injection step for injecting the liquid thermosetting resin 45 into the negative pressure cavity 26, and a liquid heat injected into the cavity 26 It includes a solidification step for solidifying the curable resin 45, a mold release step for releasing the resin molded product 10, and a separation step. In the present embodiment, as a molding method of the resin molded product 10, an example is a resin injection molding method (RTM method) for molding the resin molded product 10 made of fiber reinforced resin.

  In the elastic member mounting step, as shown in FIG. 1, the elastic member 30 is inserted into each of the plurality of openings 22. At this time, the diameter of the lower surface 33 of the elastic member 30 is smaller than the diameter of the upper end portion of the opening 22, and the elastic member 30 extends from the lower surface 33 along the taper of the inner peripheral surface 22 </ b> A of the opening 22. Inserted (see FIG. 8). This process is performed manually, for example, while aligning the positions of the opening 22 and the elastic member 30. In a state where the elastic member 30 is mounted in the opening 22, the lower surface 33 of the elastic member 30 is disposed to face the upper end surface 50 </ b> A of the push pin 50 in the molding position.

  In the fiber base material arranging step, as shown in FIG. 1, the preformed fiber base material 14P is arranged on the molding surface 21A of the lower mold 21 to which the elastic member 30 is attached. At this time, the preformed fiber base material 14 </ b> P is in a posture in which the back surface 10 </ b> B side of the resin molded product 10 faces the lower mold 21.

  In the negative pressure applying step, as shown in FIG. 2, the vacuum pump 63 is operated to exhaust the gas in the cavity 26. The cavity 26 is hermetically sealed by a seal member 28 and the opening 22 is sealed by an elastic member. When a predetermined negative pressure is applied to the cavity 26, the valve 65 is closed to keep the cavity 26 in an airtight state. At this time, a force directed toward the cavity 26, which is a negative pressure, acts on the elastic member 30, but in this embodiment, the elastic member 30 does not fall off the opening 22 due to the elastic force of the elastic member 30. Yes.

  In the resin injection step, as shown in FIG. 3, a liquid thermosetting resin 45 is injected under pressure from the resin injection portion 40. The injected liquid thermosetting resin 45 flows inside the fiber base material 14 </ b> P and along the surface thereof, and reaches the end of the cavity 26. And the liquid thermosetting resin 45 is impregnated in the whole fiber base material 14P. In the present embodiment, the liquid thermosetting resin 45 is filled in the concave portion 35 of the elastic member 30. In this resin injection step, the liquid thermosetting resin 45 has a low viscosity of about several mPa · s to several hundred mPa · s.

  In the solidification step, the liquid thermosetting resin 45 is cured to mold the resin molded product 10 and attach the elastic member 30 to the resin molded product 10. In the present embodiment, the solidification step is performed by heating the upper mold 24 and the lower mold 21 using a heating device (such as a heater) (not shown). The cured thermoplastic resin constitutes the resin portion 16 of the resin molded product 10 and also constitutes the convex portion 16A that fits into the concave portion 35 of the elastic member 30 and the sprue portion 16B that is cured inside the resin injection hole 41. (See FIG. 4). The cured thermosetting resin 45 is in close contact with the upper surface 32 and the inner surface of the concave portion 35 of the elastic member 30 to adhere the elastic member 30 to the resin molded product 10. And after the solidification process is completed, prior to the mold release process, the valve 65 of the negative pressure application unit 60 is opened to make the inside of the cavity 26 atmospheric pressure.

  In the mold release step, as shown in FIGS. 4 and 5, the upper mold 24 and the lower mold 21 are opened, and the elastic member 30 is pushed out from the molding surface 21 </ b> A, whereby the resin molded product 10 is removed from the lower mold 21. Release. Specifically, first, the upper mold 24 and the lower mold 21 are opened (see FIG. 4). Then, depending on the shape of the resin molded product 10 (for example, the shape having the flange portion 12), the resin molded product 10 is in close contact with one molding die (the lower mold 21 in this embodiment), and the other molding is performed. The mold is released from the mold (in this embodiment, the upper mold 24). Subsequently, the plurality of extrusion pins 50 are displaced from the molding position to the extrusion position, thereby pressing the plurality of elastic members 30 and simultaneously extruding the plurality of elastic members 30 from the molding surface 21A (see FIG. 5). At this time, the plurality of push pins 50 are appropriately adjusted so as to have the same amount of displacement. Then, air flows between the back surface 10 </ b> B of the resin molded product 10 and the molding surface 21 </ b> A of the lower mold 21, and the resin molded product 10 is released from the lower mold 21. At the pushing position of the push pin 50, the upper end surface 50A of the push pin 50 protrudes from the molding surface 21A, and the elastic member 30 is completely pushed out from the opening 22.

  In the separation step, as shown in FIG. 6, the elastic member 30 attached to the resin molded product 10 is separated from the extrusion pin 50 by discharging the resin molded product 10 from the upper mold 24 and the lower mold 21. After the mold release step, the elastic member 30 attached to the resin molded product 10 is placed on the extrusion pin 50, and the subsequent separation step is accompanied by the resin molded product 10. By removing the elastic member 30 from the molding apparatus 20, the elastic member 30 can be separated from the push pin 50.

  After the separation step, as shown in FIG. 7, the elastic member 30 attached to the resin molded product 10 is elastically deformed, and the fitting of the convex portions 16 </ b> A and the concave portions 35 is released, so Remove 30. Further, the sprue portion 16B in the resin molded product 10 is cut off to obtain the resin molded product 10. In the present embodiment, the convex portion 16A of the resin molded product 10 is formed on the back surface 10B and has a small configuration that does not affect the product, and is not cut away from the resin molded product 10. Is done.

  Then, the effect of this embodiment is demonstrated. According to the molding apparatus 20 of the present embodiment, the elastic member 30 is configured to be separable from the extrusion pin 50 by adhering to the resin molded product 10. For example, the member that seals the opening 22 is the extrusion pin 50. Therefore, it is not necessary to house the member that seals the opening 22 in the opening 22 as the push pin 50 is retracted from the molding surface 21A. Therefore, when the elastic member 30 is accommodated in the opening 22, the accuracy of the axial position of the push pin 50 does not matter, and the clearance and the outer periphery for easily accommodating the elastic member 30 in the opening 22 are not affected. There is no need to increase the taper of the surface 31. For this reason, the opening 22 can be reliably sealed by the elastic member 30 with a simple structure, and the situation where the liquid resin enters the opening 22 can be suppressed.

  Specifically, in the configuration in which the member that seals the opening 22 is accommodated in the opening 22 as the extrusion pin 50 is retracted from the molding surface 21A, in order to obtain the accuracy of the axial position of the extrusion pin 50, There is a concern that the processing cost of the mold will be high. If the axial position of the push pin 50 is deviated, the member that seals the opening 22 interferes with the opening edge of the opening 22 of the lower mold 21, or the elastic member 30 and the opening 22 There is a possibility that a gap may be formed between the inner peripheral surface 22A. Furthermore, in such a configuration, if the clearance is increased in order to easily accommodate the elastic member 30 in the opening 22, there is a concern that the liquid thermosetting resin 45 may enter the clearance portion. In such a configuration, if the taper of the outer peripheral surface 31 is increased in order to easily accommodate the elastic member 30 in the opening 22, a member that seals the opening 22 from the opening 22 in the negative pressure application step or the like. There is a concern that the elastic member 30 may be pulled out or the elastic member 30 may be deformed to form a gap. On the other hand, in the present embodiment, the above-described concern is eliminated by eliminating the configuration in which the member that seals the opening 22 is accommodated in the opening 22 as the extrusion pin 50 is retracted from the molding surface 21A. Can be wiped off.

  Furthermore, according to the molding apparatus 20 of the present embodiment, since the member that seals the opening 22 is the elastic member 30 that can be deformed in a reduced diameter, the opening 22 can be reliably sealed by the elastic force of the elastic member 30. it can. Temporarily, in the structure which attaches packing and O-ring to an ejector pin and suppresses the penetration | invasion of the liquid thermosetting resin 45 in the opening part 22, it is liquid thermosetting to the position of packing and O-ring. The resin 45 will intrude, and it takes time to clean the waste of the resin that has entered. On the other hand, in the present embodiment, the liquid thermosetting resin 45 can be prevented from entering the opening 22, and operations such as cleaning of resin residue in the opening 22 can be reduced. Furthermore, according to the present embodiment, since such an elastic member 30 can be separated from the push pin 50, the resin residue adhering to the elastic member 30 is removed from the molding apparatus 20 at hand. Can be cleaned.

  Furthermore, according to the molding apparatus 20 of the present embodiment, the extrusion pin 50 releases the resin molded product 10 by extruding the elastic member 30 from the molding surface 21A. Even if the position of the elastic member 30 is not easily displaced, and even if it is displaced, the outer peripheral surface 31 can follow the shape of the inner peripheral surface 22 </ b> A of the opening 22 by elastic deformation of the elastic member 30. For this reason, when the outer peripheral surface 31 of the elastic member 30 and the inner peripheral surface 22A of the opening 22 slide, an excessive frictional force hardly occurs and the resin molded product 10 can be pushed out stably. Further, in the configuration in which the plurality of elastic members 30 are simultaneously extruded from the plurality of openings 22, even if the displacement amount accuracy of the plurality of push-out pins 50 is not good, the elastic member 30 is elastically deformed to some extent. The variation in the amount of displacement can be absorbed. For this reason, it is not necessary to strictly align the displacement amounts of the plurality of extrusion pins 50 using an extrusion plate or the like, and by eliminating expensive parts such as the extrusion plate, it is possible to contribute to a reduction in mold costs. .

  Further, in the molding apparatus 20 of the present embodiment, the elastic member 30 has a recess 35 that is recessed in the upper surface 32. For this reason, the liquid thermosetting resin 45 is filled in the concave portion 35 and cured, so that the elastic member 30 can be easily attached to the resin molded product 10. As a result, the elastic member 30 can be reliably separated from the push pin 50.

  Moreover, according to the manufacturing method of the resin molded product 10 of the present embodiment, in addition to the same effects as described above, the elastic member 30 is obtained by dispensing the resin molded product 10 from the upper mold 24 and the lower mold 21 in the separation step. Can be separated from the extrusion pin 50 and taken out from the upper mold 24 and the lower mold 21, which is preferable.

  Furthermore, according to the manufacturing method of the resin molded product 10 of the present embodiment, since the elastic member 30 adheres to the resin molded product 10 in the solidification step, the elastic member 30 can be easily recovered after the separation step, It can contribute to man-hour reduction. Furthermore, the problem that the elastic member 30 is easily removed from the opening 22, which is a conflicting problem caused by making the elastic member 30 separable from the extrusion pin 50, is not dependent on the backward movement of the extrusion pin 50. The taper of the opening 22 and the elastic member 30 is reduced by attaching to the opening 22 in a separate process (the elastic member attaching process of this embodiment), and the clearance between the opening 22 and the elastic member 30 is reduced. It can be solved by reducing or eliminating the above. In the present embodiment, by attaching the elastic member 30 to the opening 22 in the elastic member attaching step, an excessive force is applied to the outer peripheral surface 31 of the elastic member 30, and the outer peripheral surface 31 of the elastic member 30 is hard gold. The situation of being cut by the lower mold 21 which is a mold is suppressed.

  Moreover, the manufacturing method of the resin molded product 10 of this embodiment is the resin injection molding method for shape | molding the resin molded product 10 which consists of fiber reinforced resin. The configuration as in the present embodiment can suitably suppress resin leakage from the opening 22 in a molding method that easily causes resin leakage, such as the resin injection molding method.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In the present embodiment, an example in which the aspect of the elastic member is different from that of the first embodiment is illustrated. In addition, the description which overlaps about the structure, an effect | action, and effect similar to above-described embodiment is abbreviate | omitted.

  The opening 122 is formed on a surface of the molding surface 21 </ b> A that has a height difference with respect to the extrusion direction of the extrusion pin 150. FIG. 9 illustrates an example in which the opening 122 opens to an inclined surface that rises toward the right side.

  The elastic member 130 has a shape in which the upper surface 132 (surface on the cavity 26 side) follows the molding surface 21A, and at a position unevenly distributed from the center of the opening 122 on the lower surface 33 (surface pressed by the push pin 150). It has the to-be-fitted part 137 recessed in the extrusion direction. In this embodiment, the to-be-fitted part 137 illustrates what is unevenly distributed and formed in the left side from the center of the opening part 122. FIG. The fitted portion 137 can accommodate a fitting portion 155 to be described later, and has a notch groove shape that is recessed in an arcuate shape.

  The push pin 150 has a fitting portion 155 that fits in the pushing direction with respect to the fitted portion 137. The fitting portion 155 has a column shape protruding upward from the upper end surface 50 </ b> A of the push pin 150. The fitting portion 155 has an arcuate shape in plan view, and is configured by an arc-shaped surface whose side surface continues to the outer peripheral surface of the push pin 150, and a surface that forms a chord of the arc.

  The fitted portion 137 and the fitting portion 155 constitute a positioning structure in which the elastic member 130 is positioned in a normal position with respect to the push pin 150 by being fitted to each other. The push pin 150 is positioned in the circumferential direction of the opening 122 with respect to the lower mold 21. With this positioning structure, the elastic member 130 can be accommodated at a normal position with respect to the opening 122. On the other hand, the fitted portion 137 and the fitting portion 155 are fitted so as to be separable along the pushing direction of the push pin 150. For this reason, in the separation step, the elastic member 130 attached to the resin molded product 10 is removed from the extrusion pin 150 by paying out from the upper die 24 and the lower die 21 while separating the resin molded product 10 upward from the extrusion pin 150. It can be easily separated.

  According to the molding apparatus 20 of the present embodiment, when the elastic member 130 is accommodated in the opening 122, the fitted portion 137 of the elastic member 130 and the fitting portion 155 of the push pin 150 are fitted. Thus, the direction of the elastic member 130 can be defined in the circumferential direction of the opening 122. For this reason, even when the elastic member 130 is separated from the push pin 150, the elastic member 130 can be accommodated in the opening 122 in a normal direction, and the upper surface 132 of the elastic member 130 can have a height difference in the push direction. The shape of the resin molded product 10 can be reliably molded.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. In the present embodiment, an example in which the aspect of the opening is different from that of the first embodiment is illustrated. In addition, the description which overlaps about the structure, an effect | action, and effect similar to above-described embodiment is abbreviate | omitted.

  The opening 222 is provided with retaining protrusions 222C and 222C that protrude from the inner peripheral surface 22A. In a state in which the elastic member 30 is accommodated in the opening 222, the elastic member 30 has a shape that follows the outer shape of the retaining protrusion 222C by elastically deforming a portion of the outer peripheral surface 31 that contacts the retaining protrusion 222C. For this reason, the elastic member 30 generates a larger elastic force than the configuration without the retaining protrusion 222C, and the shape of the elastic member 30 entering the underside of the retaining protrusion 222C becomes a catch, making it even more difficult for the elastic member 30 to be removed from the opening 222. Yes.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In the said embodiment, what consists of fiber reinforced resin was illustrated as a resin molded product, and although the resin injection method was illustrated as a manufacturing method of a resin molded product, it is not restricted to this. For example, even if the resin molded product is made of a thermoplastic resin and the manufacturing method of the resin molded product is based on the in-mold heating / cooling molding method of the thermoplastic resin, the technology disclosed in the present specification can be suitably applied. . In this case, the solidification step is not a step of heating and curing the liquid thermosetting resin, but a step of cooling and solidifying the molten thermoplastic resin.
(2) In the said embodiment, although the resin molded product illustrated what consists of a plate-shaped member which has a main plate part and a flange part, it is not restricted to this. The technology disclosed in the present specification can be applied to resin molded products having various shapes.
(3) In addition to the above embodiment, the shape and configuration of the elastic member can be changed as appropriate. For example, the elastic member does not need to have a recess as long as adhesion to a resin molded product can be ensured. In addition, as long as the elastic member can be deformed in a reduced diameter, a part of the elastic member may be formed of a member that does not have elasticity. In the second embodiment, the configuration in which the fitted portion is recessed in the extrusion direction is illustrated. However, the fitted portion may be projected in the extrusion direction. In this case, it is only necessary to form a fitting portion that fits in the push-out direction with respect to the fitted portion so as to partially cut out the upper end surface of the push-out pin.
(4) In the above embodiment, a thermosetting resin is used as the resin impregnated into the reinforcing fiber sheet. However, in other embodiments, a polyimide resin or the like can be used unless the purpose of the technique disclosed in the present specification is impaired. Other resins may be used.
(5) In the above embodiment, a woven fabric made of carbon fiber was used as the reinforcing fiber sheet. However, in other embodiments, for example, glass fiber, plastic fiber such as aromatic polyamide fiber, jute fiber, etc. Other reinforcing fibers such as plant fibers may be used. The reinforcing fiber sheet may be a knitted fabric obtained by warp knitting or warp knitting various fibers in addition to a woven fabric of various fibers. Further, as the reinforcing fiber sheet, a sheet in which a plurality of woven fabrics or knitted fabrics are laminated may be used.
(6) In addition to the above embodiment, the configuration, arrangement, and operation of each part of the molding apparatus can be changed as appropriate. For example, the exhaust hole may be formed in a space communicating with the inside of the cavity, and may be formed so as to open to the parting surface inside the seal member.
(7) Besides the above embodiment, the method for producing a resin molded product is appropriately changed. For example, the elastic member arranging step may be performed not by manual work but by work automated by a machine.

  DESCRIPTION OF SYMBOLS 10 ... Resin molded product, 20 ... Molding device, 21 ... Lower mold (a pair of molds, one mold), 21A ... Molding surface, 22, 122, 222 ... Opening, 24 ... Upper mold (A pair of molds) , 26 ... cavity, 30, 130 ... elastic member, 32, 132 ... upper surface (surface on the side of the cavity 26), 33 ... lower surface (surface pressed against the push pin 50), 35 ... recess, 40 ... resin injection part, 45 ... thermosetting resin (liquid resin), 50, 150 ... extrusion pin, 137 ... fitted portion, 155 ... fitting portion

Claims (5)

A pair of molds that form cavities by closing the molds, and a pair of molds having an opening that opens to a molding surface of at least one mold; and
An elastic member that is elastically deformable in the direction of diameter reduction and is housed in the opening and seals the opening;
A resin injection portion for injecting a liquid resin into the cavity in a state where the opening is sealed by the elastic member;
An extrusion pin configured to release a resin molded product obtained by solidifying the liquid resin injected into the cavity from the one mold by extruding the elastic member from the molding surface; With
The said elastic member is a shaping | molding apparatus comprised so that isolation | separation from the said extrusion pin was possible by adhering to the said resin molded product.   The molding apparatus according to claim 1, wherein the elastic member includes a concave portion provided in a surface on the cavity side. The opening is formed in a surface having a difference in height with respect to the extrusion direction of the extrusion pin, of the molding surface,
The elastic member has a shape in which the cavity-side surface follows the molding surface, and is recessed or convex in the extrusion direction at a position that is unevenly distributed from the center of the opening on the surface pressed by the extrusion pin. Having a fitted part provided,
The molding apparatus according to claim 1, wherein the extrusion pin has a fitting portion that fits in the pushing direction with respect to the fitting portion. A molding method for molding the resin molded product using the molding apparatus according to any one of claims 1 to 3,
Solidifying the liquid resin injected into the cavity, forming the resin molded product, and attaching the elastic member to the resin molded product;
A mold release step of releasing the resin molded product from the one mold by opening the pair of molds and extruding the elastic member from the molding surface;
A separation step of separating the elastic member attached to the resin molded product from the extrusion pin by paying out the resin molded product from the pair of molds.   The method for molding a resin molded product according to claim 4, which is a resin injection molding method for molding the resin molded product made of a fiber reinforced resin.

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