JP2016036963A - Method for manufacturing fiber-reinforced resin molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber-reinforced resin molded article manufacturing method that, while maintaining good shaping properties of a fiber-reinforced resin sheet, suppresses generation of tears and the like to enable obtaining a three-dimensionally shaped fiber-reinforced resin molded article with high accuracy and high quality.SOLUTION: First, a mounting surface 32a is projected to reach a mounting position. Subsequently, a sheet outer edge part 24a is mounted on the mounting surface 32a, whereby a height difference L1 due to self-weight is generated between the sheet outer edge part 24a and an inner part 24b to form a pre-molded body 26. Subsequently, in a state where the sheet outer edge part 24a is sandwiched between the mounting surface 32a and an upper cavity forming surface 20 to be positioned and fixed, the mounting surface 32a is lowered to a molding position and a mold is closed to shape the pre-molded body 26. The mounting position is set so that the height difference L1 is made to have a size corresponding to an external dimension difference between an unmolded body 24c and a fiber-reinforced resin molded article 28 and so that a fiber-reinforced resin sheet 24 is not brought into contact with another part 18a during a pre-molding process.SELECTED DRAWING: Figure 2

Description

  The present invention provides a fiber reinforced resin molded article obtained by shaping a softened fiber reinforced resin sheet in a cavity formed by a lower mold and an upper mold to obtain a three-dimensional fiber reinforced resin molded article having an uneven portion. It relates to the manufacturing method.

  A fiber reinforced resin sheet containing a thermoplastic resin is heated and softened, and then filled into a cavity formed by a lower mold and an upper mold, and shaped to obtain a fiber reinforced resin molded article having a desired shape. Obtaining production methods are known. In this manufacturing method, after the thermoplastic resin sheet is heated to a temperature equal to or higher than the melting temperature of the thermoplastic resin, it is generally placed on the cavity forming surface (lower cavity forming surface) of the lower mold and clamped. is there.

  However, when the fiber reinforced resin sheet is brought into contact with the lower mold and the upper mold (hereinafter collectively referred to as a mold), the heat of the fiber reinforced resin sheet is taken away by the mold. If cooling solidification is accelerated | stimulated by this, the fluidity | liquidity of a fiber reinforced resin sheet will fall. Therefore, if the fiber reinforced resin sheet is placed on the lower cavity forming surface prior to clamping the mold, the fluidity at the time of clamping is insufficient and the cavity is sufficiently filled with the fiber reinforced resin sheet. It is easy to make it difficult. That is, since the formability of the fiber reinforced resin sheet is lowered, there is a concern that a fiber reinforced resin molded product having a desired shape and strength cannot be obtained with high accuracy.

  Therefore, in Patent Document 1, in order to maintain the formability (fluidity) of the fiber reinforced resin sheet, the fiber reinforced resin sheet is avoided by contacting the cavity forming surface until immediately before clamping. A manufacturing method for obtaining a molded article has been proposed.

  Specifically, in this manufacturing method, a mold having a plurality of support pins that can be moved up and down with respect to the lower mold is used. Prior to clamping the mold, a plurality of support pins are projected from the lower cavity forming surface so that the horizontal positions of the upper end surfaces are aligned, and a fiber reinforced resin sheet is formed on the upper end surface. Place so as not to contact. Next, the mold is closed while simultaneously lowering the plurality of support pins, and the support pins are accommodated in the lower mold immediately before the upper cavity forming surface of the upper mold contacts the fiber reinforced resin sheet. And after shape | molding and cooling a fiber reinforced resin sheet within the cavity formed between the upper metal mold | die and the lower metal mold | die, a metal mold | die is open | released and a fiber reinforced resin molded product is obtained.

  In this manufacturing method, as described above, the fiber reinforced resin is simply placed on the upper end surface of the support pin, and the upper end surface is lowered in a state where no positioning and fixing are performed. For this reason, the position of the fiber reinforced resin sheet is displaced between the time when the fiber reinforced resin sheet is placed on the upper end surface of the support pin and the time when the fiber reinforced resin sheet is filled into the cavity. There is a concern that it cannot be obtained with high accuracy. In order to cope with this, it is conceivable to perform mold clamping in a state where the fiber reinforced resin sheet is placed and fixed to each of the upper end surfaces of the support pins. This positioning and fixing can be performed, for example, by providing a piercing pin or the like for each of the upper end surfaces, placing the fiber reinforced resin sheet on the upper end surface, and piercing the piercing pins.

JP-A-8-1698

  By the way, in order to obtain a three-dimensional fiber reinforced resin molded product having a concavo-convex portion by the above manufacturing method, a fiber reinforced resin is formed in a cavity having a convex portion or a concave portion corresponding to the shape of the fiber reinforced resin molded product. The sheet needs to be shaped. That is, the 1st support pin which protrudes from the recessed part of a lower cavity formation surface, and the 2nd support pin which protrudes from a convex part are provided so that raising / lowering is possible with respect to a lower metal mold | die. Then, the upper end surfaces of the plurality of support pins are protruded so that their horizontal positions are aligned, and then lowered and clamped until they are flush with the lower cavity forming surface. For this reason, the descending distance of the first upper end surface of the first support pin is larger than the descending distance of the second upper end surface of the second support pin.

  When the mold is clamped in a state where the fiber reinforced resin sheet is positioned and fixed on each of the first upper end surface and the second upper end surface due to the difference in the descending distance, the first upper end surface and the second upper end surface are aligned with respect to the fiber reinforced resin sheet. A force in the direction of stretching between the upper end surface is applied. As a result, when a force exceeding the allowable amount of deformation is applied to the fiber reinforced resin sheet, tearing or the like occurs, and the fiber reinforced resin molded product is likely to have disordered orientation of the reinforced fiber or variation in the resin content. Become.

  That is, the two-dimensional shape is formed on the three-dimensional cavity forming surface without considering the dimensional difference even though the unshaped fiber-reinforced resin sheet and the fiber-reinforced resin molded product have different outer dimensions. The fiber-reinforced resin sheet is positioned and fixed. For this reason, in the manufacturing method described above, the fiber-reinforced resin sheet is easily broken and it is difficult to obtain a three-dimensional fiber-reinforced resin molded product with high accuracy.

  The present invention has been made to solve the above-described problems, and maintains a good shapeability of the fiber reinforced resin sheet, while suppressing the occurrence of tearing and the like, and a three-dimensional fiber reinforced resin molded product. An object of the present invention is to provide a method for producing a fiber reinforced resin molded product capable of obtaining a high accuracy and high quality.

  In order to achieve the above-described object, the present invention provides a three-dimensional fiber reinforced resin having a concavo-convex portion obtained by shaping a softened fiber reinforced resin sheet in a cavity formed by a lower mold and an upper mold. A method for manufacturing a fiber-reinforced resin molded product for obtaining a molded product, wherein a mounting surface that is an upper surface of a lifting member provided to be movable up and down with respect to the lower mold is a lower cavity forming surface of the lower mold Among the fiber reinforced resin molded products, the ascending step of raising the elevating member so as to protrude from the molding position for forming the outer edge portion and reach the placement position, and the fiber reinforcement on the placement surface at the placement position. By placing the sheet outer edge portion, which is the outer edge portion of the resin sheet, a pre-molding is caused between the sheet outer edge portion of the fiber reinforced resin sheet and the inner inner portion thereof by bending due to its own weight. Preformer to form body And the lowering member is lowered until the mounting surface reaches the molding position in a state where the sheet outer edge is sandwiched and positioned between the mounting surface and the upper cavity forming surface of the upper mold. In addition, the lower mold and the upper mold are closed to form the preform in the cavity, and the preform is cooled in the cavity to cool the fiber. A solidifying step for obtaining a resin molded product, wherein the height difference is a size corresponding to a difference in external dimensions between the unmolded fiber reinforced resin sheet and the fiber reinforced resin molded product, and the preforming During the process, the placement position is set so that the fiber-reinforced resin sheet does not come into contact with a portion of the lower cavity forming surface excluding the placement surface.

  In this method of manufacturing a fiber reinforced resin molded product, first, by the ascending step, a mounting surface that can constitute a portion corresponding to the outer edge portion of the fiber reinforced resin molded product among the lower cavity forming surface reaches the mounting position. In order to do so, the raising member is raised. Next, the preforming process which forms a preform by mounting the sheet | seat outer edge part of a fiber reinforced resin sheet on the mounting surface of a mounting position is performed. That is, in the preforming step, a preform is formed by causing a difference in height between the outer edge portion and the inner portion of the fiber reinforced resin sheet by bending due to its own weight.

  At this time, since the placement surface is at the placement position, the difference in height of the preform is determined by the difference in the external dimensions between the unmolded fiber reinforced resin sheet and the fiber reinforced resin molded product (hereinafter, simply referred to as the external dimension difference). The size in accordance with the length in the mold clamping direction of the fiber-reinforced resin molded product. Moreover, a preforming process can be performed without contacting the site | part (other site | parts) except the mounting surface of a lower cavity formation surface, and a fiber reinforced resin sheet.

  Further, before or after the preforming body is formed and before the mold clamping is performed, the sheet outer edge portion is sandwiched between the placement surface and the upper cavity forming surface. Thus, the outer edge of the sheet is positioned and fixed with respect to the placement surface. In this way, with the outer edge of the sheet positioned and fixed, the elevating member is lowered until the placement surface reaches the molding position, and the lower mold and the upper mold are closed, and the preform is placed in the cavity. Perform the shaping process to shape. Thereafter, in the solidification step, after the preform in the cavity is cooled, the fiber reinforced resin molded product can be obtained by demolding.

  That is, in this manufacturing method, a three-dimensional preformed body corresponding to the external dimension difference is formed in advance. At this time, contact between the fiber reinforced resin sheet and the other part of the lower cavity forming surface is avoided, so that the heat of the fiber reinforced resin sheet is deprived by the mold and the formability is reduced. it can.

  Then, the mold clamping step is performed in a state where the preform is positioned and fixed with respect to the lower cavity forming surface and the upper cavity forming surface (hereinafter collectively referred to as a cavity forming surface). For this reason, accompanying the fiber-reinforced resin sheet along the cavity-forming surface having an uneven shape, excessive deformation occurs in the fiber-reinforced resin sheet, and a force exceeding the allowable deformation amount is applied. Can be suppressed. Therefore, it is possible to effectively avoid the fiber reinforced resin sheet from being torn during mold clamping. As a result, it is possible to avoid occurrence of disorder in the orientation of the reinforcing fibers, variation in the resin content, and the like in the fiber-reinforced resin molded product.

  As described above, according to this manufacturing method, while maintaining the shapeability of the fiber reinforced resin sheet, it is possible to suppress the occurrence of tearing and the like, and to produce a three-dimensional fiber reinforced resin molded product with high accuracy and high quality. To be able to get to.

  Further, this positioning and fixing sandwiches the sheet outer edge portion between the upper cavity forming surface and the placement surface capable of configuring the portion corresponding to the outer edge portion of the fiber reinforced resin molded product in the lower cavity forming surface. Is done. That is, it is possible to avoid the formation of pressing marks or the like for positioning and fixing on the inner side of the fiber reinforced resin sheet. As a result, it becomes possible to obtain a fiber-reinforced resin molded product having excellent aesthetic design.

  In the method for manufacturing a fiber-reinforced resin molded article, the elevating member includes a sliding pin that is slidably inscribed with respect to the lower mold, and a mounting plate provided on an upper end of the sliding pin. It is preferable that the upper surface of the mounting plate constitutes the mounting surface. In this case, for example, it is not necessary to separately provide a mechanism or the like for raising and lowering the elevating member outside the mold. Therefore, as described above, high-precision and high-quality fiber-reinforced resin molding can be easily obtained at a low cost with a simple configuration.

  In the method for manufacturing a fiber-reinforced resin molded article, in the preliminary molding step, the sheet outer edge portion is placed on the placement surface, and the sheet outer edge portion is pierced by a piercing pin protruding from the placement surface. It is preferable to perform clamping in a state where the relative position of the outer edge of the sheet with respect to the cavity is fixed in the shaping step. In this case, it is possible to more effectively suppress the occurrence of positional deviation between the time when the outer edge of the sheet is placed on the placement surface and the time when the fiber-reinforced resin sheet is filled into the cavity. Therefore, it becomes possible to obtain a high-precision and high-quality fiber-reinforced resin molded product more easily.

  In the present invention, by placing the sheet outer edge portion of the fiber reinforced resin sheet on the placement surface that protrudes to the placement position, the fiber reinforced resin sheet comes into contact with the cavity forming surface and is cooled before clamping. Can be avoided. In addition, it is possible to form a preform in a shape corresponding to the fiber reinforced resin molded product by causing a difference in height between the outer edge portion and the inner side portion of the fiber reinforced resin sheet. In a state where the preform is positioned and fixed with respect to the mounting surface, the preform is lowered to a molding position, and then clamping is performed. For this reason, accompanying the fiber-reinforced resin sheet along the cavity-forming surface having an uneven shape, excessive deformation occurs in the fiber-reinforced resin sheet, and a force exceeding the allowable deformation amount is applied. Can be suppressed.

  As a result, it is possible to obtain a three-dimensional shape fiber reinforced resin molded product with high accuracy and high quality while maintaining good formability of the fiber reinforced resin sheet and suppressing occurrence of tearing and the like. .

1 is a schematic perspective configuration diagram of a lower mold of a molding apparatus capable of performing a method for producing a fiber-reinforced resin molded product according to the present invention. In the shaping | molding apparatus of FIG. 1, it is a schematic block diagram which shows the state which mounted the sheet | seat outer edge part of the fiber reinforced resin sheet on the mounting surface of a mounting position, and formed the preform. It is explanatory drawing for demonstrating the difference of the external dimension before shaping (preliminary molding) about the fiber reinforced resin sheet | seat of FIG. 2, and the external dimension after shaping (fiber reinforced resin molded product). FIG. 3 is a schematic configuration diagram showing a state in which the lower mold and the upper mold are closed while the mounting surface is lowered in the molding apparatus of FIG. 2. FIG. 5 is a schematic configuration diagram illustrating a state in which the lower mold and the upper mold are clamped and a preform is shaped in the cavity in the molding apparatus of FIG. 4. FIG. 6 is a schematic configuration diagram illustrating a state where the lower mold and the upper mold are opened in the molding apparatus of FIG. 5. It is a principal part schematic block diagram which shows the modification of the shaping | molding apparatus of FIG. FIG. 8 is a schematic configuration diagram of a main part showing a state in which a lower mold and an upper mold are clamped in the molding apparatus shown in FIG. 7.

  Hereinafter, a preferred embodiment of a method for producing a fiber-reinforced resin molded product according to the present invention (hereinafter, also simply referred to as a production method) will be described in detail with reference to the accompanying drawings.

  In the manufacturing method according to the present invention, a softened fiber reinforced resin sheet is shaped in a cavity formed by a lower mold and an upper mold to obtain a three-dimensional fiber reinforced resin molded article having an uneven portion. As a fiber reinforced resin sheet, what impregnated the thermoplastic resin to the fiber base material which made the reinforcing fiber into the sheet form is employable, for example. This fiber substrate may be a single sheet or a plurality of sheets.

  The manufacturing method according to the present embodiment will be described with reference to FIGS. The molding apparatus 10 includes a mold including a lower mold 12 and an upper mold 14, and an elevating member 16 provided to be movable up and down with respect to the lower mold 12. In addition, illustration of the upper metal mold | die 14 is abbreviate | omitted in FIG.

  The lower mold 12 is a fixed mold, and the upper mold 14 that is a movable mold approaches the lower mold 12 along the vertical direction, and the mold is closed. As a result, a cavity 22 (see FIG. 5) is formed between the lower cavity forming surface 18 of the lower mold 12 and the upper cavity forming surface 20 of the upper mold 14. Clamping is performed to fill the cavity 22 with a preform 26 (see FIG. 2) obtained by preforming the fiber reinforced resin sheet 24, so that the fiber reinforced resin sheet 24 has a desired shape. To be molded. That is, each of the lower cavity forming surface 18 and the upper cavity forming surface 20 (hereinafter collectively referred to as a cavity forming surface) is a fiber reinforced resin molded product 28 obtained by molding the fiber reinforced resin sheet 24. It has a concavo-convex shape according to the shape.

  The elevating member 16 includes a plurality of sliding pins 30 and a placement plate 32. The plurality of sliding pins 30 are slidable with respect to the lower mold 12. The mounting plate 32 has a plate shape along a sheet outer edge portion 24 a (see FIGS. 2 to 5) that is an outer edge portion of the fiber reinforced resin sheet 24, and is continuously provided on the upper ends of the plurality of sliding pins 30. ing. That is, in the elevating member 16, the mounting surface 32 a that is the upper surface of the mounting plate 32 constitutes a part of the lower cavity forming surface 18 as the sliding pin 30 moves up and down with respect to the lower mold 12. It moves between the molding position and the mounting position protruding from the molding position.

  For example, as shown in FIG. 5, when the mounting surface 32a is in the molding position, a molding outer edge portion 28a (FIGS. 3 and 3) that is an outer edge portion of the fiber reinforced resin molded product 28 in the lower cavity forming surface 18. 6)). Further, the mounting position is set to be a height described later with respect to the other part 18a which is a part of the lower cavity forming surface 18 excluding the mounting surface 32a, and the mounting surface 32a is set to the mounting position. At some time, the sheet outer edge 24a is placed.

  The mounting plate 32 is provided with a plurality of piercing pins 34 protruding from the mounting surface 32a. As shown in FIG. 1, each of the plurality of piercing pins 34 is disposed at a position shifted from the axial direction of the plurality of sliding pins 30. Moreover, the piercing pin 34 is pierced by the sheet | seat outer edge part 24a mounted in the mounting surface 32a as mentioned above. Thereby, the sheet outer edge portion 24a can be positioned and fixed with respect to the placement surface 32a. The upper mold 14 has an accommodation hole 14a (FIGS. 2, 4 to 6) in which a piercing pin 34 protruding from the lower cavity forming surface 18 (mounting surface 32a) is accommodated when the mold is clamped. Reference) is formed.

  A manufacturing method for manufacturing the fiber reinforced resin molded article 28 by shaping the fiber reinforced resin sheet 24 using the molding apparatus 10 basically configured as described above will be described.

  First, as shown in FIG. 2, the ascending step is performed to raise the slide pin 30 and bring the placement surface 32 a to the placement position. And the preforming process which forms the preforming body 26 by mounting the sheet | seat outer edge part 24a on the mounting surface 32a of this mounting position is performed. At this time, the piercing pin 34 is pierced through the outer edge 24a of the sheet.

  In this preforming step, the preform 26 is produced by causing a height difference L1 (see FIG. 2) between the outer edge 24a of the fiber reinforced resin sheet 24 and the inner inner portion 24b of the fiber reinforced resin sheet 24 by bending due to its own weight. Form.

  As shown in FIG. 3, the height difference L1 is the difference between the outer dimension Lb of the unmolded body 24c, which is an unmolded fiber-reinforced resin sheet 24, and the outer dimension La of the fiber-reinforced resin molded product 28 (hereinafter simply referred to as outer dimension). (It is also called a difference). In other words, the height difference L1 is a size corresponding to the length of the fiber reinforced resin molded product 28 in the mold clamping direction.

  That is, the mounting position is a height at which the height difference L1 can be formed between the sheet outer edge portion 24a and the inner portion 24b in the preforming step, and the other portion 18a and the fiber reinforced resin. The height is set so as not to contact the sheet 24.

  Further, before or after the preforming body 26 is formed and before the mold clamping is performed, as shown in FIG. 4, the sheet outer edge portion 24a is sandwiched between the placement surface 32a and the upper cavity forming surface 20. To do. Thus, the sheet outer edge portion 24a is positioned and fixed with respect to the placement surface 32a.

  In this manner, the placement surface 32a lowers the sliding pin 30 and closes the lower mold 12 and the upper mold 14 with the sheet outer edge 24a positioned and fixed. Then, as shown in FIG. 5, the forming surface 32 a is made to reach the molding position, the mold is clamped, and a shaping process for shaping the preform 26 in the cavity 22 is performed.

  Thereafter, a fiber-reinforced resin molded product 28 can be obtained by performing a solidification step and cooling the preform 26 formed in the cavity 22. As shown in FIG. 6, the fiber reinforced resin molded product 28 is taken out by releasing the mold. At this time, the elevating member 16 can be used as an eject pin. That is, the fiber reinforced resin molded product 28 can be pushed out from the lower mold 12 and taken out by raising the slide pin 30 and projecting the mounting surface 32a from the molding position.

  As described above, in this manufacturing method, as described above, the three-dimensional preformed body 26 corresponding to the external dimension difference is formed in advance. At this time, since the contact between the fiber reinforced resin sheet 24 and the other portion 18a of the lower cavity forming surface 18 is avoided, the heat of the fiber reinforced resin sheet 24 is deprived by the mold and the formability is lowered. Can be suppressed.

  Then, the mold clamping process is performed in a state where the preform 26 is positioned and fixed with respect to the cavity forming surface. For this reason, the fiber reinforced resin sheet 24 can be satisfactorily aligned with the cavity forming surface having the uneven shape. In addition, in this way, along with the fiber-reinforced resin sheet 24 along the cavity forming surface, excessive deformation occurs in the fiber-reinforced resin sheet 24 and a force exceeding the allowable deformation amount is applied. Can be suppressed. Accordingly, it is possible to effectively avoid the fiber reinforced resin sheet 24 from being torn during mold clamping. As a result, it is possible to prevent the fiber reinforced resin molded product 28 from being disturbed in the orientation of the reinforced fiber and the variation in the resin content.

  Therefore, according to this manufacturing method, while maintaining the shapeability of the fiber reinforced resin sheet 24, it is possible to suppress the occurrence of breakage and the like, and to make the three-dimensional shape fiber reinforced resin molded article 28 highly accurate and high. It becomes possible to obtain quality.

  In the positioning and fixing, the sheet outer edge 24a is sandwiched between the upper cavity forming surface 20 and the placement surface 32a that can constitute the portion corresponding to the molding outer edge 28a in the lower cavity forming surface 18. It is done by doing. That is, it is possible to avoid the formation of pressing marks or the like for positioning and fixing on the inner portion 24b of the fiber reinforced resin sheet 24. As a result, it is possible to obtain a fiber reinforced resin molded article 28 having excellent aesthetic design.

  Further, the sheet outer edge portion 24a is inserted into the piercing pin 34 protruding from the mounting surface 32a and positioned and fixed, and thus the mold clamping is performed in a state where the positional deviation of the sheet outer edge portion 24a with respect to the cavity 22 is more effectively suppressed. Can do. As a result, it is possible to more effectively suppress the occurrence of misalignment between the placement of the sheet outer edge 24a on the placement surface 32a and the filling of the fiber reinforced resin sheet 24 into the cavity 22. Therefore, it becomes possible to obtain the high-precision and high-quality fiber-reinforced resin molded product 28 more easily.

  In addition, this invention is not specifically limited to above-described embodiment, Of course, a various deformation | transformation is possible in the range which does not deviate from the summary.

  For example, in the above embodiment, the elevating member 16 is composed of the sliding pin 30 and the mounting plate 32, but is not particularly limited thereto. The raising / lowering member may be comprised only from the sliding pin. In this case, the upper end surface of the sliding pin can be the mounting surface.

  In the above-described embodiment, a plurality of piercing pins 34 projecting from the placement surface 32a are provided, and the accommodation holes 14a in which the piercing pins 34 projecting from the placement surface 32a are accommodated when the mold is clamped. Is formed on the upper mold 14. However, it is not particularly limited to this. For example, as shown in FIGS. 7 and 8, instead of the piercing pin 34, a movable stab that can expand and contract a protruding length from the placement surface 32a (hereinafter also simply referred to as a protruding length). A through pin 36 may be provided.

  Specifically, the mounting plate 32 is provided with an accommodation hole 40 for accommodating the piercing pin 36 and the elastic member 38. The elastic member 38 elastically biases the piercing pin 36 in a direction in which the distal end side of the piercing pin 36 protrudes from the placement surface 32a. Further, at the position corresponding to the piercing pin 36 of the upper mold 14, the upper cavity forming surface 20 is continuously formed instead of forming the accommodation hole 14 a. That is, when the mold is clamped, the upper cavity forming surface 20 and the tip of the piercing pin 36 come into contact with each other, so that a pressing force against the urging force of the elastic member 38 is applied to the piercing pin 36 and the protruding length Becomes smaller.

  Therefore, when the mounting surface 32a is in the mounting position before mold clamping, the protruding length of the piercing pin 36 is maximized, so that the piercing pin 36 can be easily pierced into the sheet outer edge portion 24a. Then, when the mounting surface 32a reaches the molding position, the mold is clamped, and the preform 26 is shaped in the cavity 22, the piercing pin 36 is set according to the size of the cavity 22. The protruding length can be set (see FIG. 8). That is, in this case, since it is not necessary to form the accommodation hole 14 a in the upper mold 14, it is possible to improve the aesthetic design of the resulting fiber reinforced resin molded product 28 and to easily obtain the upper mold 14. become.

  In addition, as above-mentioned, the site | part in which a through-hole is formed by piercing the piercing pins 34 and 36 to the sheet | seat outer edge part 24a of the fiber reinforced resin sheet 24 may isolate | separate by trimming after mold release. .

  In addition, the mounting plate 32 is provided with a plurality of piercing pins 34 or a plurality of piercing pins 36, but each of the piercing pins 34, 36 may be one or one. It does not have to be.

DESCRIPTION OF SYMBOLS 10 ... Molding apparatus 12 ... Lower metal mold 14 ... Upper metal mold 14a, 40 ... Accommodating hole 16 ... Elevating member 18 ... Lower cavity formation surface 18a ... Other part 20 ... Upper cavity formation surface 22 ... Cavity 24 ... Fiber reinforced resin sheet 24a ... Outer edge portion of sheet 24b ... Inner portion 24c ... Unmolded body 26 ... Preliminary molded body 28 ... Fiber-reinforced resin molded product 28a ... Outer edge portion 30 ... Sliding pin 32 ... Placement plate 32a ... Placement surface 34, 36 ... Stick Through pin 38 ... elastic member

Claims (3)

A method for producing a fiber-reinforced resin molded product, in which a softened fiber-reinforced resin sheet is shaped in a cavity formed by a lower mold and an upper mold to obtain a three-dimensional fiber-reinforced resin molded product having an uneven portion. There,
From the molding position where the mounting surface, which is the upper surface of the elevating member provided so as to be movable up and down with respect to the lower mold, forms the outer edge of the fiber reinforced resin molded product among the lower cavity forming surface of the lower mold An ascending step of raising the elevating member so as to protrude and reach the mounting position;
By placing a sheet outer edge portion, which is an outer edge portion of the fiber reinforced resin sheet, on the placement surface in the previous placement position, between the sheet outer edge portion of the fiber reinforced resin sheet and an inner side portion inside thereof. In addition, a preforming step for forming a preform by causing a height difference due to bending by its own weight,
In the state where the sheet outer edge is sandwiched between the placement surface and the upper cavity forming surface of the upper mold and positioned and fixed, the lifting member is lowered until the placement surface reaches the molding position, and A shaping step of closing the lower mold and the upper mold and shaping the preform in the cavity;
A solidifying step of cooling the preform formed in the cavity to obtain the fiber-reinforced resin molded product,
The height difference is a size corresponding to a difference in outer dimensions between the unmolded fiber reinforced resin sheet and the fiber reinforced resin molded product, and the lower cavity forming surface is described above during the preforming step. The manufacturing method of the fiber reinforced resin molded product characterized by setting the said mounting position so that the said fiber reinforced resin sheet may not contact the site | part except a mounting surface. In the manufacturing method of the fiber reinforced resin molded article of Claim 1,
The elevating member includes a sliding pin that is slidably inscribed with respect to the lower mold, and a mounting plate that is provided at an upper end of the sliding pin, and the upper surface of the mounting plate is as described above. A method for producing a fiber-reinforced resin molded product, comprising a placement surface. In the manufacturing method of the fiber reinforced resin molded article of Claim 1 or 2,
In the preforming step, the sheet outer edge portion is placed on the placement surface, and the sheet outer edge portion is pierced and fixed to a piercing pin protruding from the placement surface,
In the shaping step, the mold is clamped in a state where the relative position of the outer edge of the sheet with respect to the cavity is fixed.

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