JP2019084788A - Molding apparatus, and method for manufacturing fiber reinforced resin molded product - Google Patents

Abstract

To provide a technique restraining the pressure in a cavity from keeping increasing after an unconsolidated resin is filled in the cavity of a molding mold.SOLUTION: A molding apparatus 20 according to the present invention includes: a molding mold 30 having a pair of dividable molds 31 and 32 each including one of molding surfaces 31a and 32a, and to be formed with a cavity C surrounded by the molding surfaces 31a and 32a when clamped; a resin feeding device 40 for feeding an unconsolidated resin R into the cavity C; a cylinder-shaped cylinder 51; a plunger 52 advanceable/retractable in the cylinder 51; a buffering chamber 54 comprising a tip end surface 52a1 of the plunger 52 and an inner circumferential surface 51a of the cylinder 51, and having a space S inside communicating with the cavity C; and a resin pressure control mechanism 50 having a pressure absorber 53 for absorbing pressure from the resin R while retracting the plunger 52 when a part of the resin R overflows from the cavity C and is filled in the buffering chamber 54.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a molding apparatus and a method for producing a fiber-reinforced resin molded article.

  Resin molded products reinforced with reinforcing fibers such as carbon fibers and glass fibers are widely used. As an example of such a resin molded product, one obtained by solidifying a laminate in which a sheet-like reinforcing fiber base material is superimposed on the front and back surfaces of a core material made of a foamed resin with a thermosetting resin (for example, , Patent Document 1). This type of resin molded product is molded using RTM (Resin Transfer Molding) method, and specifically, in a state where the above-mentioned laminate is set in the cavity of the mold, it is uncured in the cavity The resin molded product is manufactured by injecting a thermosetting resin having the fluidity of the state, and thermosetting the resin in a state in which the resin is impregnated in the reinforcing fiber base and the like of the laminate.

Unexamined-Japanese-Patent No. 04-224915 gazette

  As described above, after the uncured thermosetting resin is injected into the cavity and the cavity is filled with the resin, if the resin continues to be injected, the pressure in the mold (in the cavity) rises. Keep doing. As a result, if the pressure in the mold becomes too high, the resin molded product (particularly, the core material of the laminate) may be crushed by the influence of the pressure, which is a problem.

  An object of the present invention is to provide a technique for suppressing an increase in pressure in a cavity of a mold after the resin in an uncured state is filled.

  A molding apparatus according to the present invention includes a mold having a pair of split molds each including a molding surface and forming one cavity surrounded by the molding surface when clamping, and an uncured state in the cavity A resin supply device for supplying resin, a cylindrical cylinder, a plunger capable of moving back and forth in the cylinder, a tip end surface of the plunger and an inner peripheral surface of the cylinder, and communication with the cavity inside A resin having a buffer chamber having a space, and a pressure absorbing portion for absorbing pressure from the resin while retracting the plunger when a part of the resin overflows from the cavity and is filled in the buffer chamber And a pressure control mechanism.

  In the forming apparatus, preferably, the resin supply device stops the supply of the resin to the cavity when the plunger retracts into the cylinder to a predetermined position.

  In the molding apparatus, preferably, the resin pressure control mechanism presses the resin filled in the buffer chamber to hold the inside of the cavity after the resin supply device stops supplying the resin. .

  In the method for producing a fiber-reinforced resin molded product according to the present invention, the uncured resin is impregnated in a laminate having a core material and a pair of reinforcing fiber substrates respectively overlaid on the front and back surfaces of the core material. A method for producing a fiber-reinforced resin molded article, comprising the step of producing a fiber-reinforced resin molded article obtained by curing the resin with the molding apparatus according to any one of the foregoing, The resin supply device in the cavity in which the laminate is accommodated, a setting process in which the laminate is set, a clamping process in which the mold is clamped so that the laminate is accommodated in the cavity, and And a resin supplying step of supplying an uncured resin by utilizing the above, and a part of the resin overflowing from the cavity and being filled in the buffer chamber of the resin pressure control mechanism, while retracting the plunger Said pressure Absorbing portion and a pressure absorption step for absorbing the pressure from the resin.

  According to the present invention, it is possible to provide a technique for suppressing the pressure in the cavity from continuing to rise after the uncured resin is filled in the cavity of the mold.

Explanatory drawing which represented the cross-sectional structure of the fiber reinforced resin molded product typically Explanatory drawing which shows the process in which the laminated body of the sandwich structure which consists of a core material and a pair of reinforcement fiber base materials is set to the fixed mold of a shaping | molding apparatus An explanatory view showing a movable mold approaching a fixed mold in a mold clamping process Explanatory drawing which represented the cross-sectional structure of the resin pressure control mechanism typically Explanatory drawing which shows the process in which uncured resin is inject | poured into the cavity of the clamped mold. Explanatory drawing showing a process in which the plunger of the resin pressure control mechanism absorbs the pressure in the cavity while receding (rising) by receiving pressure from the resin flowing into the buffer chamber. Explanatory drawing showing the process of holding the pressure in the cavity while the plunger of the resin pressure control mechanism presses the resin that has flowed into the buffer chamber. Graph showing the relationship between pressure and time in the mold of the present embodiment and the comparative example Explanatory drawing showing a process in which the plunger of the resin pressure control mechanism pushes out the hardened resin in the cylinder while the movable mold ascends at the time of mold opening Explanatory drawing which shows the process in which a molded article is removed from a fixed mold Explanatory drawing which represented typically the cross-sectional structure of the resin pressure control mechanism with which the shaping | molding apparatus of Embodiment 2 is provided. Explanatory drawing which represented typically the cross-sectional structure of the resin pressure control mechanism with which the shaping | molding apparatus of Embodiment 3 is equipped. Explanatory drawing which represented typically the cross-sectional structure of the shaping | molding apparatus of Embodiment 4

First Embodiment
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 10. In the present embodiment, a molding apparatus 20 for manufacturing a fiber-reinforced resin molded product 10 using the RTM method and a method for manufacturing the fiber-reinforced resin molded product 10 will be illustrated. First, with reference to FIG. 1, a fiber-reinforced resin molded product 10 manufactured by the molding apparatus 20 will be described.

[Fiber-reinforced resin molded products]
FIG. 1 is an explanatory view schematically showing a cross-sectional configuration of a fiber-reinforced resin molded product (hereinafter, molded product) 10. As shown in FIG. The molded article 10 is lightweight and highly rigid, and is used as part of a vehicle seat (for example, a backboard). Such a molded article 10 is mainly impregnated with the core material 11, the sheet-like reinforcing fiber substrates 12 and 12 superimposed respectively on the front and back surfaces of the core material 11, and the reinforcing fiber substrates 12 and 12, And a resin portion 13 made of a thermosetting resin to be cured.

  The core member 11 is a member made of a synthetic resin (so-called foamed resin) having a closed cell structure. The core material 11 of the present embodiment is shaped like a plate (layered) having a thickness larger than that of the reinforcing fiber base 12. As a synthetic resin utilized for core material 11, an acrylic resin is mentioned, for example. In addition, although the core material 11 of this embodiment consists of one layer (namely, single layer), in another embodiment, you may be used in the state of the multilayer structure on which the several core material 11 was laminated | stacked. .

  The reinforcing fiber base 12 is made of a woven fabric of carbon fibers (carbon fibers) processed into a sheet. As the reinforcing fiber base 12, in addition to carbon fibers, other fibers such as glass fibers may be used, but from the viewpoint of providing high strength, the reinforcing fiber base 12 made of carbon fibers is most preferable. For convenience of explanation, the reinforcing fiber base 12 superimposed on the front surface 11 a of the core 11 is referred to as “reinforcing fiber base 12 A”, and the reinforcing fiber base 12 is superimposed on the rear surface 11 b of the core 11. May be expressed as "reinforcing fiber base 12B". In the case of the present embodiment, the reinforcing fiber base 12A on the front side and the reinforcing fiber base 12B on the back side are made of carbon fiber woven fabric having the same thickness.

  As shown in FIG. 1, the core material 11 is sandwiched from the front and back sides by a pair of reinforcing fiber bases 12A and 12B, and they have a so-called sandwich structure.

  As a thermosetting resin utilized for the resin part 13, what is generally used by RTM method (for example, two-liquid mixing type epoxy resin) is used. In addition, as a thermosetting resin, a colorless and transparent thing may be utilized and what a coloring agent is added may be utilized.

  In the molded product 10, the cured product of the thermosetting resin that constitutes the resin portion 13 is formed so as to cover the surface of the reinforcing fiber base 12 as well as the inside of the reinforcing fiber base 12. Therefore, in the molded article 10, the resin portion 13 is formed so as to wrap the entire laminate including the core material 11 and the pair of reinforcing fiber bases 12A and 12B.

  Since such a molded article 10 includes the core material 11, the amount of use of the relatively expensive reinforcing fiber base 12 (particularly, carbon fiber) is reduced while maintaining the lightness and high rigidity. Can.

[Molding device]
Next, each configuration of the molding device 20 will be described while describing a method of manufacturing the molded article 10 using the molding device 20 with reference to FIGS. FIG. 2 is an explanatory view showing a process of setting the laminate X including the core material 11 and the pair of reinforcing fiber bases 12A and 12B in the fixed mold 31 of the molding apparatus 20. As shown in FIG.

  The molding apparatus 20 includes a molding die 30 having a fixed die 31 which is one split die and a movable die 32 (see FIG. 3 etc.) which is the other split die. The fixed mold 31 is provided with a molding surface 31 a that forms the front side of the molded article 10. The molding surface 31a has a shape in which the center side is concavely recessed. FIG. 2 shows the mold 30 in the mold open state, and the fixed mold 31 is disposed on a horizontal floor surface so that the molding surface 31 a faces upward. In the mold open state, the movable mold 32 stands by above the fixed mold 31, but is omitted in FIG. On the molding surface 31a of the fixed mold 31 in such a mold-opened state, the laminate X composed of the core material 11 and the pair of reinforcing fiber bases 12A and 12B is placed (setting step). The laminated body X is set to the fixed mold 31 in a state in which the shape of the molding surface 31 a is followed. In the case of the present embodiment, the laminated body X is placed on the molding surface 31 a of the fixed mold 31 with the peripheral edge rising. The laminate X may be preformed into a shape that conforms to the shape of the molding surface 31 a in advance. A binder (for example, a powdery adhesive) is applied in advance to the reinforcing fiber base 12A, 12B, etc. constituting the laminate X, and the laminate X is kept in a predetermined shape by the action of the binder. There is. The laminate X may be shaped using the molding surface 31 a by pressing the laminate X against the molding surface 31 a or the like.

  As shown in FIG. 2, the core material 11 of the laminate X is smaller than the reinforcing fiber bases 12A and 12B, and the peripheral edge of the reinforcing fiber bases 12A and 12B is arranged outside the peripheral edge of the core material 11. It is in a state of being Then, the peripheries of the reinforcing fiber bases 12A and 12B are directly overlapped with each other without interposing the core material 11.

  FIG. 3 is an explanatory view showing the movable mold 32 approaching the fixed mold 31 in the mold clamping process. As shown in FIG. 3, the movable mold 32 waiting above the fixed mold 31 descends so as to approach the fixed mold 31, whereby the mold clamping of the mold 30 is performed. (Clamping process). The movable mold 32 is driven to move up and down using a known lifting mechanism (reciprocation mechanism) (not shown) provided with a hydraulic cylinder or the like. Such a movable mold 32 is provided with a molding surface 32 a that forms the back side of the molded article 10. The molding surface 32a has a shape in which the center side is convexly raised. The molding surface 32 a is provided on the inner side (inner surface side) of the movable mold 32 facing the fixed mold 31. As described later, in the mold 30 in the mold clamped state, a space surrounded by the molding surface 32 a of the movable mold 32 and the molding surface 31 a of the fixed mold 31 becomes the cavity C of the mold 30.

  The movable mold 32 generally has a lid shape so as to cover the concave molding surface 31 a of the fixed mold 31. An injection hole (sprue) 33 for injecting a resin into the mold 30 is provided in the central portion of such a movable mold 32. The injection hole 33 is provided so as to penetrate the movable mold 32 and is in communication with the cavity C of the mold 30. And the nozzle 41 of the resin supply apparatus 40 is attached to such an injection hole 33 in the form inserted toward an inner side from the outer side.

  The resin supply device 40 is a device for supplying the uncured thermosetting resin to the cavity C of the mold 30. The resin supply device 40 of the present embodiment supplies a two-component mixed epoxy resin consisting of a main agent and a curing agent into the mold 30. In particular, the resin supply device 40 includes a mixing head that discharges the main agent and the curing agent toward the molding die 30 while causing collision mixing. The main agent and the curing agent are respectively contained in predetermined tanks, and are sent to the mixing head at the correct blending ratio by the respective pressure pumps. Then, the main agent and the curing agent collide and mix in the mixing head, and an uncured epoxy resin composed of the mixture is discharged from the nozzle 41 at the tip of the mixing head. The resin discharged from the nozzle 41 is injected into the cavity C via the injection hole 33.

  A seal member 34 surrounding the periphery of the cavity C is provided on the inner peripheral side (inner surface side) of the movable mold 32. When such a seal member 34 is sandwiched between the fixed mold 31 and the movable mold 32 at the time of mold clamping, the gap between the movable mold 32 and the fixed mold 31 around the cavity C is sealed. Be done.

  Further, the movable mold 32 is provided with a resin pressure control mechanism 50 for adjusting the pressure (resin pressure) of the resin injected into the molding die 30. In the case of the present embodiment, two resin pressure control mechanisms 50 are provided upright on the outer periphery (outer surface side) of the movable mold 32. In the case of the present embodiment, the resin pressure control mechanism 50 is disposed at a position separated from the injection hole 33 into which the resin is injected from the resin supply device 40.

  FIG. 4 is an explanatory view schematically showing a cross-sectional configuration of the resin pressure control mechanism 50. As shown in FIG. The resin pressure control mechanism 50 is mainly disposed on a cylindrical cylinder 51, a plunger (piston) 52 capable of advancing and retracting the inside of the cylinder 51, and a rear end side of the plunger 52, and drives the plunger 52 and the like. And a unit 53.

  On the outer side (outer surface side) of the movable mold 32, a concave attachment hole 32b is provided in which the tip portion 50a of the resin pressure control mechanism 50 is fitted. The tip portion 50a is processed into a tapered shape, and the portion is fitted in a manner to be in intimate contact with the mounting hole 32b. Further, on the rear side of the tip portion 50a, a flange 50b protruding outward from the outer peripheral surface 51b of the cylinder 51 is provided, and the flange 50b is fixed to the movable mold 32 with a bolt (not shown). Thus, the resin pressure control mechanism 50 is fixed to the movable mold 32.

  A communication hole 32 c communicating the cavity C of the mold 30 and the space S on the tip side of the cylinder 51 is provided in the central portion of the mounting hole 32 b. A space S on the tip side of the cylinder 51 is surrounded by the inner circumferential surface 51 a of the cylinder 51 and the tip surface 52 a 1 of the plunger 52, and such a portion surrounding the space S is a buffer chamber 54. The volume of the buffer chamber 54 is variable, and the volume decreases as the plunger 52 advances (drops), and conversely, the volume increases as it retracts (rises).

  The distal end portion 52 a of the plunger 52 can move forward and backward in the cylinder 51 in close contact with the inner circumferential surface 51 a of the cylinder 51 without a gap. The distal end portion 52a is formed by attaching a plurality of O-rings 52c to the distal end portion of a metal cylindrical plunger body 52b. A coating film 51a1 made of a fluorine resin (PTFE or the like) is formed on the inner peripheral surface 51a of the cylinder 51, and the tip 52a of the plunger 52 can easily slide in the cylinder 51, and furthermore, the buffer chamber The resin cured in the inside of 54 is easily peeled off from the cylinder 51.

  After the resin pressure control mechanism 50 spreads the resin in the cavity C and fills the cavity C with the resin, the pressure in the cavity C (even if the resin supply device 40 continues to supply the resin in the cavity C) It has a function (pressure absorption function) to suppress the rise of resin pressure. When the resin supplied from the resin supply device 40 reaches the cavity C, a part of the resin overflows from the cavity C and flows into the buffer chamber 54 through the communication hole 32 c. When the inside of the buffer chamber 54 is filled with resin, the plunger 52 tip 52 a (tip surface 52 a 1) receives pressure from the resin in the buffer chamber 54. The plunger 52 receiving the pressure absorbs the pressure from the resin while retracting (rising) in the cylinder 51. The mechanism unit 53 of the resin pressure control mechanism 50 functions as a pressure absorbing unit that absorbs the resin pressure while retracting the plunger 52. The specific configuration of the pressure absorbing portion is not particularly limited as long as the object of the present invention is not impaired. For example, a known hydraulic pressure absorbing mechanism is applied.

  Further, the resin pressure control mechanism 50 has a function (pressure holding function) of holding the inside of the cavity C by pressing the resin filled in the buffer chamber 54 and applying a constant pressure to the resin. . The pressure in the cavity C connected to the buffer chamber 54 is maintained within a certain range by driving the plunger 52 in the forward (downward) direction and pressing the resin in the buffer chamber 54. . The mechanism unit 53 also drives the plunger 52 when holding the pressure in the cavity C.

  Furthermore, the resin pressure control mechanism 50 also has a function (extrusion function) of advancing the plunger 52 forward (lowering) and pushing the resin hardened in the buffer chamber 54 to the outside of the cylinder 51. The mechanism portion also drives the plunger 52 when the resin cured in the buffer chamber 54 is pushed out.

  FIG. 5 is an explanatory view showing a step of injecting the uncured resin R into the cavity C of the clamped mold 30. As shown in FIG. 5, when the mold 30 is clamped, a space surrounded by the molding surface 31 a of the fixed mold 31 and the molding surface 32 a of the movable mold 32 is formed as one cavity C. Ru. The laminated body X is accommodated in the cavity C of the mold 30 which is clamped.

  In the state where the mold 30 is clamped, the plunger 52 of the resin pressure control mechanism 50 is at rest most advanced (lowered) to the cavity C side. At that time, the buffer chamber 54 below the plunger 52 is in the state of the smallest volume.

  After clamping, the gas in the cavity C is discharged to the outside by using a negative pressure application mechanism (not shown) provided in the molding apparatus 20, and the inside of the cavity C is brought into a negative pressure state (negative pressure application step). The movable mold 32 of the mold 30 is provided with an exhaust hole (not shown) in the form of a through hole, and the gas in the cavity C is exhausted to the outside by the vacuum pump through the exhaust hole.

  When the negative pressure in the cavity C reaches a predetermined value, a predetermined valve device (not shown) is activated to stop the discharge of gas from the exhaust hole. Then, the inside of the cavity C is kept airtight. After that, the uncured resin (epoxy resin) is injected into the cavity C in such a state by using the resin supply device 40. In the case of the present embodiment, the injection pressure of the resin supply device 40 is relatively low (for example, 0.3 MPa to 5 MPa, preferably 1 MPa or less) in order to suppress the core material 11 of the laminate X from being crushed or the like. Set to).

  The resin supply device 40 injects into the cavity C the collision mixing of the two-component mixed epoxy resin composed of the main agent and the curing agent (resin supply step). The epoxy resin injected into the cavity C flows along the interior, the surface, etc. of the reinforcing fiber base 12 and spreads to every corner of the cavity C. The liquid epoxy resin in the uncured state is easily impregnated with the laminate X even if the injection pressure of the resin is low because the viscosity is low (for example, about several mPa · s to about 100 mPa · s), and the cavity It is easy to fill C.

  6 shows a process (pressure absorbing process) in which the plunger 52 of the resin pressure control mechanism 50 absorbs pressure in the cavity C while receding (rising) by receiving pressure from the resin flowing into the buffer chamber 54. FIG. As described above, when the resin overflowing from the cavity C flows into the buffer chamber 54 through the communication hole 32 c and the inside of the buffer chamber 54 is filled with the resin, the pressure absorbing portion (mechanism portion 53) While retracting the plunger 52 in the direction of the arrow 60 shown in FIG. 6, the pressure received from the resin in the buffer chamber 54 is absorbed. As a result, even if the resin is continuously supplied from the resin supply device 40 into the cavity C, the resin pressure control mechanism 50 suppresses the increase in the resin pressure in the cavity C.

In the cylinder 51 of the resin pressure control mechanism 50, when the tip 52a of the plunger 52 retracts (rises) to a predetermined height position, the injection of the resin into the cavity C is stopped.
The control unit (not shown) of the resin supply device 40 controls the mixing head to stop the discharge of the resin based on the information of the height position (retraction position) of the plunger 52 output from the resin pressure control mechanism 50. It instructs to close the on-off valve of the nozzle 41 at the tip of the.

  FIG. 7 is an explanatory view showing a process (pressure holding process) in which the plunger 52 of the resin pressure control mechanism 50 holds the pressure in the cavity C while pressing the resin filled in the buffer chamber 54. As described above, after the injection of the resin into the mold 30 by the resin supply device 40 is stopped, the tip 52 a of the plunger 52 is a buffer chamber so that the pressure in the cavity C does not decrease more than necessary. The mechanical portion 53 of the resin pressure control mechanism 50 operates so as to press the resin in the lower portion 54 downward (in the direction of the arrow 70 shown in FIG. 7) with a constant force. By operating the resin pressure control mechanism 50 in this manner, the pressure in the cavity C is maintained at a certain value (that is, the pressure in the cavity C is held), and the small bubbles present in the resin expand and gather. As a result, generation of air bubbles of a visible size on the resin surface is suppressed.

  As described above, curing of the resin in the mold 30 is performed in a state where the pressure in the cavity C of the mold 30 is held (hardening process). The mold 30 is provided with a heating device (heater etc.) not shown, and the resin in the cavity C is cured by heating the mold 30 by the heating device. Note that, along with the curing of the resin in the cavity C, the resin in the communication hole 32c and the resin in the buffer chamber 54 are also cured.

  FIG. 8 is a graph showing the relationship between pressure and time in molds of the present embodiment and the comparative example. Here, the relationship between the pressure in the mold and the time in the present embodiment and the comparative example will be described with reference to FIG. The horizontal axis of FIG. 8 shows time, and the vertical axis shows the pressure in the mold. In FIG. 8, a graph indicated by a solid line represents a relationship between pressure and time in the mold 30 of the present embodiment from the injection of the resin to the holding pressure. As shown in FIG. 8, when injection of resin is started at time T1, the pressure in the mold 30 rises with the passage of time. Thereafter, when resin overflows from inside the cavity C of the mold 30, and the resin flows into the buffer chamber 54 of the resin pressure control mechanism 50 through the communication hole 32c, the plunger 52 of the resin pressure control mechanism 50 starts to ascend. . The time T2 is a time when the plunger 52 starts to rise. Thereafter, the resin pressure control mechanism 50 stops the injection of the resin from the resin supply device 40 at time T3 while suppressing the pressure increase in the mold 30. Thereafter, the plunger 52 of the resin pressure control mechanism 50 presses the resin in the buffer chamber 54, whereby the pressure in the mold 30 is maintained substantially constant, and the pressure holding in the mold 30 and the pressure in the mold 30. Curing of the resin takes place.

  On the other hand, in FIG. 8, a graph indicated by a broken line is a case where the mold of the comparative example in which the communication pressure 32 c is closed without using the resin pressure control mechanism 50 is used. As shown in FIG. 8, as in the case of the present embodiment, when injection of the resin is started at time T1, the pressure in the mold of the comparative example rises with the passage of time. Even after the mold cavity is filled with the resin, if the resin is continuously supplied from the resin supply device 40, the pressure in the mold continues to further increase. Then, the pressure in the mold (cavity) is increased until the injection of the resin from the resin supply device 40 is stopped. Time T4 is the time which stopped the injection of the resin from the resin supply apparatus in the comparative example. Thus, the pressure in the mold of the comparative example continues to rise even after the resin is filled in the cavity, so the pressure in the mold becomes too high, and the core material 11 of the laminate X is Problems such as collapse occur. In addition, when the pressure in the mold becomes too high, a device (press machine) for clamping such a mold becomes very large, and furthermore, an injection machine for injecting a thermosetting resin into the mold. (Pump) will also be heavily loaded.

  As described above, in the molding apparatus 20 according to the present embodiment, the maximum pressure (peak pressure) in the mold 30 (in the cavity C) is significantly greater than the maximum pressure (peak pressure) in the mold of the comparative example. It is possible to make it smaller.

  FIG. 9 is an explanatory view showing a step (extrusion step) in which the plunger 52 of the resin pressure control mechanism 50 pushes out the cured resin in the cylinder 51 while the movable mold is lifted at the time of mold opening. As described above, after the resin is cured in a state where the pressure in the mold 30 is held, the mold 30 is opened (mold opening process). At the time of mold opening, the movable mold 32 ascends away from the fixed mold 31. Further, at the time of mold opening, the plunger 52 of the resin pressure control mechanism 50 advances (drops) in the direction of the arrow 80 shown in FIG. 9 in order to press the resin hardened in the cylinder 51 and push it out from the cylinder 51. ). Then, a columnar resin portion R1 hardened in the cylinder 51 and in the communication hole 32c is obtained in a state of being erected on the back surface side of the molded article 10.

  FIG. 10 is an explanatory view showing a step (demolding step) in which the molded product 10 is demolded from the fixed mold 31. As shown in FIG. After the mold is opened, when the molded article 10 left on the molding surface 31a of the fixed mold 31 is removed from the molding surface 31a, a molded article 10 in which a columnar resin portion R1 is erected on the back surface side is obtained. The resin portion R1 may be used as it is as a part of the molded article 10, or may be removed from the molded article 10 as appropriate when not required. Thus, the molded article 10 is manufactured using the molding apparatus 20.

  As described above, in the molding apparatus 20 of the present embodiment, the increase in the resin pressure in the cavity C of the molding die 30 is suppressed by the action of the resin pressure control mechanism 50, and the molded article 10 in the cavity C (laminated body X Can be prevented from collapsing.

  Further, in the molding apparatus 20 of the present embodiment, the inside of the cavity C of the molding die 30 is held by the action of the resin pressure control mechanism 50, so that the generation of air bubbles on the surface of the molded article 10 is suppressed.

  Further, in the molding apparatus 20 of the present embodiment, there is variation in the size (volume) etc. of the laminate X set in the molding die 30, and even if the amount of resin injected into the cavity C changes, the surplus is left. The resin can be absorbed by the buffer chamber 54 of the resin pressure control mechanism 50.

  Further, in the molding apparatus 20 of the present embodiment, since the injection pressure of the resin from the resin supply device 40 is low, displacement of the reinforcing fiber base 12 in the cavity C is prevented. Further, since the molding apparatus 20 of the present embodiment can supply the resin at a low pressure, equipment cost reduction and mold cost reduction can be realized.

Second Embodiment
Next, Embodiment 2 of the present invention will be described with reference to FIG. The present embodiment exemplifies a molding apparatus which differs from the first embodiment only in the configuration of the resin pressure control mechanism 50A. About the same composition as Embodiment 1, the same numerals as the composition of Embodiment 1 are attached, and the detailed explanation is omitted (the same may be said of each embodiment after Embodiment 2). FIG. 11 is an explanatory view schematically showing a cross-sectional configuration of a resin pressure control mechanism 50A provided in the molding apparatus of the second embodiment. In the resin pressure control mechanism 50A of the present embodiment, an oil inlet 150 in the form of a through hole is provided in a peripheral wall portion of the cylinder 51. In the resin pressure control mechanism 50A, the inner circumferential surface 51a of the cylinder 51 and the rear end surface 52a2 of the tip 52a of the plunger 52 form an oil chamber 55, and the space inside the oil chamber 55 is supplied from the outside Oil (lubricating oil) 151 is supplied via the oil inlet 150. The oil inlet 150 is disposed rearward (upper) than the position of the tip 52 a of the plunger 52 that moves back and forth in the cylinder 51. After removing the molded product from the mold of the molding apparatus, the plunger 52 of the resin pressure control mechanism 50A is advanced (lowered) and retracted (raised) multiple times within the cylinder 51 to prepare for the next molding. Repeatedly, the oil spreads on the inner circumferential surface 51a of the cylinder 51, the resin cured in the cylinder 51 (buffer chamber 54) is easily released, and the tip 52a of the plunger 52 is easily slid. As described above, the resin pressure control mechanism 50A in which the releasability and the slidability are ensured by the lubricating oil 151 may be used for the molding apparatus.

Embodiment 3
Next, Embodiment 3 of the present invention will be described with reference to FIG. This embodiment also illustrates a molding apparatus that differs from the first embodiment only in the configuration of the resin pressure control mechanism 50B. FIG. 12 is an explanatory view schematically showing a cross-sectional configuration of a resin pressure control mechanism 50B provided in the molding apparatus of the third embodiment. In the resin pressure control mechanism 50 </ b> B of the present embodiment, a gas discharge hole 250 in the form of a through hole is provided in the peripheral wall portion of the cylinder 51. As shown in FIG. 12, in a state where the plunger 52 is retracted rearward (upward), the gas exhaust hole 250 is disposed forward (downward) than the tip end surface 52 a 1 of the plunger 52. The molding apparatus of this embodiment utilizes the gas discharge hole 250 provided in the cylinder 51 of the resin pressure control mechanism 50B and the vacuum line 251 connected to the gas discharge hole 250 when making the inside of the cavity into a negative pressure state. Thus, the gas G in the cavity is discharged to the outside. A vacuum pump is connected to the downstream side of the vacuum line 251, and by the action of the vacuum pump, the inside of the mold (cavity) and the inside of the cylinder 51 of the resin pressure control mechanism 50B are in a negative pressure state. Thus, the resin pressure control mechanism 50B may be utilized when the inside of the mold cavity is under negative pressure.

Fourth Embodiment
Next, a fourth embodiment of the present invention will be described with reference to FIG. The present embodiment is configured such that the resin pressure control mechanism 50C is attached to the fixed mold 31 side of the mold 30. FIG. 13 is an explanatory view schematically showing a cross-sectional configuration of the molding apparatus 20C of the fourth embodiment. As shown in FIG. 13, on the outer surface side (bottom surface side) of the fixed mold 31, an attachment hole 32 </ b> Cb in which the tip portion of the resin pressure control mechanism 50 </ b> C is fitted is provided. A communication hole 32Cc communicating the cavity C of the mold 30 with the space (buffer chamber 54) at the tip end of the cylinder 51 is provided in the central portion of the mounting hole 32Cb. After the molded product 10C is cured in the mold 30 and the mold 30 is opened, when the molded product 10C is released from the fixed mold 31, the plunger 52 of the resin pressure control mechanism 50C is advanced ( The molded product 10C may be released from the fixed mold 31 in such a manner as to raise the columnar resin portion R11 hardened in the cylinder 51 and in the communication hole 32Cc. As described above, the resin pressure control mechanism 50C may be used in the step of removing the molded product 10C.

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

  (1) In the first embodiment, although two resin pressure control mechanisms are provided in the mold, the present invention is not limited to this. For example, one resin pressure control mechanism is provided for the mold. However, three or more resin pressure control mechanisms may be provided.

  (2) In the first embodiment, the hydraulic pressure absorbing mechanism is applied to the pressure absorbing portion of the resin pressure control mechanism, but the present invention is not limited thereto. For example, an elastic body such as a spring or rubber is used. A known pressure absorbing mechanism such as a pressure absorbing mechanism used or an air type pressure absorbing mechanism may be applied.

  (3) In the first embodiment, the foamed resin having a closed cell structure is used as the core material of the laminate, but the present invention is not limited thereto. For example, in the case where weight reduction is unnecessary, etc. A solid resin material containing no bubbles may be used as the core material, or a foam resin having an open cell structure may be used as the core material.

  (4) In another embodiment, the core material may be formed of a low melting point bismuth alloy or the like used in the lost core method. Then, the obtained molded product may be placed in an oil bath, and the core material may be finally removed from the molded product. In this way, a hollow molded article may be molded.

  (5) In another embodiment, a molded article may be manufactured using a thermosetting resin such as a urethane resin or a phenol resin.

  DESCRIPTION OF SYMBOLS 10 ... Fiber reinforced resin molded product (molded article) 11 ... Core material, 12 ... Reinforcing fiber base material, 13 ... Resin part, 20 ... Molding apparatus, 30 ... Molding mold, 31 ... Fixed mold (divided mold), 31a: molding surface, 32: movable mold (divided mold), 32a: molding surface, 32b: mounting hole, 32c: communication hole, 40: resin supply device, 50: resin pressure control mechanism, 51: cylinder, 51a ... Inner circumferential surface 52, Plunger 52a: Tip portion 52a1: Tip surface 53: Mechanism portion (pressure absorbing portion) 54: Buffering chamber, C: Cavity, S: Space, R: Resin in uncured state, X ... stack

Claims (4)

A mold having a pair of split molds, each of which includes a molding surface and in which one cavity surrounded by the molding surface is formed when clamping;
A resin supply device for supplying uncured resin to the cavity;
A cylindrical cylinder, a plunger capable of moving back and forth in the cylinder, a buffer chamber comprising a tip end surface of the plunger and an inner peripheral surface of the cylinder and having a space communicating with the cavity inside; And a resin pressure control mechanism having a pressure absorbing portion for absorbing the pressure from the resin while retracting the plunger when a part of the resin overflows from the cavity and is filled in the buffer chamber.   The molding apparatus according to claim 1, wherein the resin supply device stops the supply of the resin to the cavity when the plunger retracts to a predetermined position in the cylinder.   3. The molding apparatus according to claim 2, wherein the resin pressure control mechanism presses the resin filled in the buffer chamber to hold the pressure in the cavity after the resin supply device stops supplying the resin. . A fiber reinforced resin comprising a laminate having a core material and a pair of reinforcing fiber bases respectively overlaid on the front and back surfaces of the core material, impregnated with a resin in an uncured state, and then cured. It is a manufacturing method of the fiber reinforced resin molded product which manufactures a molded product with the molding apparatus as described in any one of Claims 1-3,
A setting step of setting the laminate to the mold in the mold open state;
A clamping step of clamping the mold so that the laminate is accommodated in the cavity;
A resin supply step of supplying an uncured resin to the cavity containing the laminate using the resin supply device;
A pressure absorbing step in which the pressure absorbing portion absorbs pressure from the resin while retracting the plunger when a part of the resin overflows from the cavity and is filled in the buffer chamber of the resin pressure control mechanism; A method of producing a fiber reinforced resin molded article comprising:

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