JP2023139587A - Method for manufacturing resin molded product - Google Patents

Abstract

To provide a method for manufacturing a resin molded product, which can eliminate a trim step after resin molding and reduce waste of materials.SOLUTION: In a fixing step, an upper insert 170 is prepared, an outer edge 210 of a glass mat 200 is sandwiched between a lower mold 110 and the upper insert 170, and a position of the upper insert 170 is fixed with respect to the lower mold 110. After the fixing step, in a cutting step, a protruding part 220 of the outer edge 210 of the glass mat 200 that protrudes from a side surface 171 of the upper insert 170 is cut along the side surface 171 of the upper insert 170. After the cutting step, in an assembling step, an upper mold 130 is assembled to the lower mold 110 with a portion of the upper mold 130 in contact with the side surface 171 of the upper insert 170.SELECTED DRAWING: Figure 6

Description

The present invention relates to a method for manufacturing a resin molded article.

Conventionally, a glass mat made of glass fiber was placed between a lower mold and an upper mold, the lower mold and upper mold were assembled, and resin was applied to the glass mat while vacuuming between the lower mold and upper mold. A method of injecting and curing molding is proposed, for example, in Patent Document 1.

JP 2021-54034 Publication

Usually, when forming a resin molded product, the outer edge portion of the resin molded product is previously formed to be large. This is because when the glass mat is sandwiched between the lower mold and the upper mold and the molds are clamped, the glass mat, which should be located at the outer edge of the resin molded product, may be displaced from the mold. For this reason, it is necessary to prepare a glass mat of a size with a margin in advance, taking into account the shift of the glass mat during mold clamping.

Furthermore, since the outer edge portion of the resin molded product is formed to be larger, an unnecessary portion is generated at the outer edge portion of the resin molded product. For this reason, after demolding, a trim step is required to cut unnecessary portions of the outer edge portion of the resin molded product, and the cut portions are wasted.

In view of the above-mentioned points, an object of the present invention is to provide a method for manufacturing a resin molded product that eliminates a trim step after resin molding and can reduce waste of materials.

In order to achieve the above object, the invention according to claim 1 includes an installation step of installing a glass mat (200) made of glass fiber between the lower mold (110) and the upper mold (130). . It also includes a molding process in which resin is injected into the glass mat while a vacuum is drawn between the lower mold and the upper mold, and the resin is cured.

The installation process includes a fixing process, a cutting process, and an assembly process. In the fixing step, an upper insert (170) is prepared, the outer edge (210) of the glass mat is sandwiched between the lower mold and the upper insert, and the position of the upper insert is fixed with respect to the lower mold.

In the cutting step, after the fixing step, a protruding portion (220) of the outer edge of the glass mat that protrudes from the side surface (171) of the upper insert is cut along the side surface of the upper insert. In the assembly step, after the cutting step, the upper mold is assembled to the lower mold with a portion of the upper mold in contact with the side surface of the upper insert.

According to this, the position of the outer edge of the glass mat is fixed in advance by the lower mold and the upper insert before the molding process, so that it is possible to prevent the glass mat from shifting.

Then, in the cutting step, the protruding portion of the glass mat is cut along the side surface of the upper insert, so that the outer edge (310) of the resin molded product (300) can be adjusted in advance to the shape along the side surface of the upper insert. Therefore, after the molding process, it is possible to eliminate the trim process of cutting unnecessary portions of the outer edge of the resin molded product.

Further, the size of the glass mat can be adjusted in advance so that the length of the protrusion of the glass mat is shortened. Therefore, since the amount of protrusions to be cut is reduced, waste of glass mat and resin can be reduced.

Note that the reference numerals in parentheses of each means described in this column and the claims indicate correspondence with specific means described in the embodiment described later.

FIG. 1 is an exploded perspective view of a mold according to an embodiment. FIG. 2 is a front view of the mold shown in FIG. 1; FIG. 2 is a side view of the mold shown in FIG. 1; FIG. 3 is a plan view of the upper mold. 5 is a sectional view taken along line VV in FIG. 4. FIG. It is a side view showing the state where the glass mat is sandwiched between the upper nest and the lower nest. 5 is a sectional view taken along line VII-VII in FIG. 4. FIG. 5 is a sectional view taken along line VIII-VIII in FIG. 4. FIG. FIG. 7 is a cross-sectional view showing a comparative example of a mold clamping part. FIG. 7 is a cross-sectional view showing a comparative example of a mold clamping part. FIG. 7 is a cross-sectional view showing a comparative example of a mold clamping part. FIG. 7 is a cross-sectional view showing a comparative example of a mold clamping part. It is a sectional view showing a part of the resin molded product and a part of the runner after demolding. It is a sectional view showing a modification of the mold.

Hereinafter, one embodiment will be described with reference to the drawings. The method for manufacturing a resin molded product according to the present embodiment is applied to a step of pouring resin into the mold while vacuuming the inside of the mold, curing the resin, and then demolding the resin molded product. I can do it. In this embodiment, a silicone back construction method is adopted in which an elastically deformable resin sheet is used as a part of the mold.

By the manufacturing method according to the present embodiment, resin molded products used for, for example, in-vehicle parts, vehicle parts, medical equipment, ships, sporting goods, wind power generation blades, water purification tanks, bathtubs, railway vehicles, etc. are manufactured. be able to. In the following, a frame for accommodating a refrigeration device will be manufactured as an in-vehicle component.

The method for manufacturing a resin molded product includes an installation process and a molding process. The installation step is a step of installing a sheet-like glass mat 200 made of glass fiber between the lower mold 110 and the upper mold 130 of the mold 100 shown in FIGS. 1 to 8. The glass mat 200 is a material that serves as a base material for a resin molded product. The installation process is a preparatory process and a preparatory process for resin molding.

In the molding process, after the installation process, a vacuum is drawn between the lower mold 110 and the upper mold 130, and the resin is applied to the glass mat 200 while the upper mold 130 is elastically deformed along the shape of the lower mold 110. This is the process of injecting and curing the resin.

Next, the contents of each step and the equipment used in each step will be explained. First, in the installation process, the mold 100 and the glass mat 200 are prepared, and a fixing process of fixing the glass mat 200 to the mold 100 is performed.

In the fixing step, as the mold 100, the lower mold 110, the upper mold 130, the lower insert 150, and the upper insert 170 shown in FIGS. 1 to 3 are prepared. Note that the lower mold 110, the upper mold 130, the lower insert 150, and the upper insert 170 may each be configured independently, or, for example, the lower mold 110 may include the lower insert 150.

The lower mold 110 is made of a material such as a resin such as fiber reinforced plastic (FRP), a thermosetting resin, or rubber, or a metal. The lower mold 110 has a mold part 111 in which the outer shape of the resin molded product is preformed.

The upper mold 130 shown in FIG. 4 is composed of an elastic sheet 131 made of silicone that can be elastically deformed. As shown in FIGS. 1 to 3, the upper mold 130 is previously formed in a shape that follows the shape of the lower mold 110. That is, the upper mold 130 has a portion corresponding to the shape of the mold part 111 of the lower mold 110.

As shown in FIG. 4, the elastic sheet 131 constituting the upper mold 130 has a plurality of through holes 132 for injecting resin and evacuation. In this embodiment, for example, two through holes 132 for resin injection are provided in the outer edge portion 133 of the elastic sheet 131. Further, three through holes 132 for vacuuming are provided in the elastic sheet 131 at positions corresponding to the mold part 111 of the lower mold 110. Note that the number and position of the through holes 132 are appropriately set depending on the type of resin molded product and the like.

The upper mold 130 has a joint portion 134 provided in each through hole 132. The joint portion 134 is made of silicone having a hardness different from that of the elastic sheet 131. The joint portion 134 has a hardness that can withstand vacuum pressure during evacuation, can maintain its shape, and can be easily processed to have a smooth surface. The Shore hardness of the joint portion 134 is, for example, 40 to 70.

As the elastic sheet 131, one formed of a material softer than the joint portion 134 is used. The Shore hardness of the elastic sheet 131 is, for example, 10 or more. Further, the elastic sheet 131 does not stick to the resin molded product and has solvent resistance and heat resistance.

As shown in FIG. 5, the joint portion 134 has a tube portion 135 and a projection portion 136. The tube portion 135 has an internal passage 135a through which evacuated air and resin pass. The internal passage 135a is a hollow portion of the tube portion 135. The tube portion 135 has, for example, a hollow cylindrical shape. Note that the tube portion 135 may have a cylindrical shape having an internal passage 135a, and is not limited to a hollow cylindrical shape.

The protruding portion 136 is a flange-shaped portion from which the outer wall of the tube portion 135 on the one end 137 side protrudes. Note that the cross-sectional shape of the projection 136 is not limited to a rectangular shape, and may be a triangular or trapezoidal shape. Further, the protruding portion 136 may be disposed flush with the end surface of the tube portion 135 on the one end portion 137 side, or may be disposed flush with the end surface of the tube portion 135 on the one end portion 137 side and on the other end portion 138 side. It may be arranged at a position between the end face and the end face.

When the other end 138 of the tube portion 135 is inserted into the through hole 132, the protrusion 136 is caught on the edge 139 forming the through hole 132. The edge 139 may be formed in advance into a shape into which the protrusion 136 fits. The other end 138 of the tube portion 135 is exposed to the outside from the through hole 132.

Further, the edge portion 139 is in contact with the outer wall of the tube portion 135 on the side of the one end portion 137. The one end 137 side of the tube portion 135 and the edge 139 of the elastic sheet 131 are only in contact with each other and are not fixed with an adhesive or the like.

The protruding portion 136 of the tube portion 135 is provided to prevent the joint portion 134 from slipping out from the through hole 132. The protrusion 136 may be provided in a ring shape at one end 137 of the tube 135, or may be provided intermittently at the one end 137 of the tube 135. In order to increase the contact area between the elastic sheet 131 and the joint portion 134, a protrusion may be provided on the surface of the outer peripheral surface of the tube portion 135 that contacts the edge portion 139.

A joint portion 140 made of polypropylene (PP), for example, is connected to the other end 138 of the joint portion 134 . That is, the joint portion 140 is inserted into the internal passage 135a of the tube portion 135. A hose 141 is connected to the side of the joint part 140 opposite to the side of the joint part 134. The hose 141 is connected to a resin supply machine (not shown) when the joint 134 to which the hose 141 is connected is for resin injection, and when the joint 134 to which the hose 141 is connected is for vacuum evacuation. is connected to a vacuum pump (not shown).

Furthermore, as shown in FIG. 4, the upper mold 130 has a mold clamping part 142. The mold clamping part 142 is a part for fixing the upper mold 130 to the lower mold 110 by vacuuming, which is separate from resin molding. The mold clamping part 142 is provided continuously around the outer edge part 133 of the elastic sheet 131.

The lower insert 150 and the upper insert 170 are disposed between the lower mold 110 and the upper mold 130, and are parts for sandwiching and fixing the outer edge 210 of the glass mat 200. As the lower insert 150 and the upper insert 170, those that are harder than the upper mold 130 and the lower mold 110 are used. The lower insert 150 and the upper insert 170 have, for example, a Rockwell hardness of R25 or higher.

In this way, by using hard materials as the lower insert 150 and the upper insert 170, a smooth surface can be formed in the portion of the resin molded product sandwiched between the lower insert 150 and the upper insert 170. . Therefore, the surface accuracy of the outer edge portion of the resin molded product, which requires surface accuracy, can be ensured.

Furthermore, the lower insert 150 and the upper insert 170 are made of polyacetal (POM). Thereby, after resin molding, the upper insert 170 and the lower insert 150 do not stick to the resin molded product, that is, they do not stick. It also has the advantage of being solvent resistant and having high processability.

Note that the lower insert 150 and the upper insert 170 may be made of other materials such as polyethylene (PE), polypropylene, and fluororesin.

As shown in FIG. 1, the lower insert 150 has a ring shape with a portion missing. On the other hand, the upper insert 170 has a ring shape. The lower insert 150 and the upper insert 170 only need to be able to sandwich a part of the outer edge 210 of the glass mat 200, and do not need to be ring-shaped.

The lower nest 150 and the upper nest 170 may be constructed by combining a plurality of divided parts. Furthermore, the lower insert 150 and the upper insert 170 may be ones in which a plurality of components are disposed intermittently. Workability can be improved by constructing the lower nest 150 and the upper nest 170 from a plurality of divided parts.

The lower insert 150 is fitted into a taper pin or positioning pin (not shown) provided on the lower die 110. Thereby, the lower insert 150 is positioned with respect to the lower die 110. The positioning of the lower insert 150 with respect to the lower mold 110 may be performed by using the fitting shapes of the lower insert 150 and the lower mold 110, or by using parts other than the shaft.

Further, in the fixing step, as shown in FIG. 6, the glass mat 200 is sandwiched between the lower insert 150 and the upper insert 170. At this time, the lower insert 150 and the upper insert 170 are used so that the side surface 171 of the upper insert 170 and the side surface 151 of the lower insert 150 are located on the same plane. Thereby, the space 101 can be secured next to the side surface 171 of the upper insert 170 and the side surface 151 of the lower insert 150 in the fixing process.

As the lower insert 150, one in which a groove 152 is provided on the side surface 151 is used. The groove portion 152 is a part that serves as a demolding point for demolding the resin molded product from the lower mold 110 after resin molding. The groove portion 152 is formed on the surface of the lower insert 150 that faces the lower die 110. For example, the mold is removed by inserting a tool such as a crowbar into the groove 152 and moving the crowbar using the principle of leverage. The groove portion 152 may be a hole provided in a part of the side surface 151 of the lower insert 150.

Here, as shown in FIG. 7, the lower insert 150 has a magnet 153. Upper nest 170 has magnets 172 . Each magnet 153, 172 is, for example, a neodymium magnet. Each magnet 153, 172 provides each nest 150, 170 with the function of positioning each nest 150, 170 without contact and the function of pressurizing the glass mat 200 with each nest 150, 170.

The magnet 172 is exposed on the surface of the upper insert 170 that faces the lower insert 150. Similarly, the magnet 153 is exposed on the surface of the lower insert 150 that faces the upper insert 170. The magnet 172 may be insert molded into the upper insert 170. Similarly, the magnet 153 may be insert molded into the lower insert 150.

Note that the magnets 153 and 172 only need to be able to attract each other without contact. Therefore, the magnets 153 and 172 are not limited to solid ones, and may have any configuration as long as they can apply attractive force while being kneaded into the material of the nests 150 and 170 and in a non-contact state using electromagnets.

As shown in FIG. 6, the lower insert 150 and the upper insert 170 cover the outer edge 210 of the glass mat 200 so that the side surface 171 of the upper insert 170 and the side surface 151 of the lower insert 150 are located on the same surface. Sandwich. Further, the position of the upper insert 170 with respect to the lower insert 150 is fixed by the magnet 172 of the upper insert 170 and the magnet 153 of the lower insert 150.

As a result, a portion of the outer edge 210 of the glass mat 200 protrudes from the side surface 171 of the upper insert 170 and the side surface 151 of the lower insert 150 as a protrusion 220 .

Subsequently, after the fixing process, a cutting process is performed. In the cutting process, the protrusions 220 protruding from the side surfaces 151 and 171 of the respective nests 150 and 170 on the outer edge 210 of the glass mat 200 are cut using a tool such as scissors. Cut along 171.

Since the space 101 is secured next to each side surface 151, 171 of each nest 150, 170, that is, the space for cutting the protrusion 220 is secured, so that the protrusion 220 of the glass mat 200 can be easily cut. can be cut into. Large-scale equipment such as machine tools is not required, and work efficiency is improved.

Thereafter, in the assembly step, the upper mold 130 is fixed to the lower mold 110 with the protrusion 136 side of the joint portion 134 facing the glass mat 200 side. Further, the upper mold 130 is assembled to the lower mold 110 with a portion of the upper mold 130 in contact with each side surface 151, 171 of each nest 150, 170.

As shown in FIGS. 7 and 8, the lower mold 110 has a recess 114 in which the outer edge 113 of the opposing surface 112 of the lower mold 110 that faces the upper mold 130 is recessed. The upper die 130 has a protrusion 144 that protrudes from a portion of the facing surface 143 facing the lower die 110 that corresponds to the concave portion 114 and is fitted into the concave portion 114 . Thereby, the convex portion 144 of the upper mold 130 is fitted into the recess 114 of the lower mold 110, so that the upper mold 130 can be positioned with respect to the lower mold 110.

Further, the lower mold 110 has a flat portion 115 that corresponds to the mold clamping portion 142 of the upper mold 130 and is a flat surface. The mold clamping part 142 of the upper mold 130 has a vacuum passage 145 as a space formed by recessing a part of the outer edge part 133 of the elastic sheet 131 on the side opposite to the flat part 115 of the lower mold 110. . As shown in FIG. 8, the vacuum passage 145 is evacuated via the joint 134 provided in the upper mold 130.

In this embodiment, in a state where the upper mold 130 is fixed to the lower mold 110 by the mold clamping part 142, the vacuum passage in the direction perpendicular to both the direction in which the mold clamping part 142 extends and the surface direction of the flat part 115. The cross-sectional shape of 145 is an anti-trapezoidal shape with respect to the surface of the flat portion 115. That is, the upper base of the trapezoid is directed toward the plane portion 115 side.

The inventors investigated the lifting of the outer edge portion 133 of the upper mold 130 by simulation for each of the comparative examples shown in FIGS. 9 to 12, in addition to the case where the cross-sectional shape of the vacuum passage 145 was an anti-trapezoid.

In FIG. 9, a flange portion 146 that contacts the plane portion 115 is provided in a portion of the mold clamping portion 142 that constitutes the vacuum passage 145. Due to the evacuation of the mold clamping part 142, the flange part 146 was lifted from the flat part 115, and the part indicated by the arrow in FIG. 9 was slightly lifted from the opposing surface 112 of the lower mold 110.

In FIG. 10, the cross-sectional shape of the vacuum passage 145 is square. Due to the evacuation of the mold clamping part 142, the part indicated by the arrow in FIG. 10 rose up from the opposing surface 112 of the lower mold 110 more than in the case of the shape shown in FIG.

FIG. 11 shows that the protrusion 147 provided on the upper mold 130 is fitted into the groove 116 provided on the opposing surface 112 of the lower mold 110, so that a gap between the bottom of the groove 116 and the protrusion 147 forms a vacuum passage. 145 is constructed. In this case, due to the evacuation of the mold clamping part 142, the part indicated by the arrow in FIG. 11 rose up from the opposing surface 112 of the lower mold 110 more than in the case of the shape of FIG.

In FIG. 12, the vacuum passage 145 has a circular cross-sectional shape. Due to the evacuation of the mold clamping part 142, the part indicated by the arrow in FIG. 12 rose up from the opposing surface 112 of the lower mold 110 more than in the case of the shape of FIG. 11.

For each comparative example shown in FIGS. 9 to 12, when the cross-sectional shape of the vacuum passage 145 was the anti-trapezoidal shape shown in FIGS. 7 and 8, the outer edge 133 of the upper mold 130 did not rise. . Therefore, by making the cross-sectional shape of the vacuum passage 145 into an anti-trapezoidal shape, when the upper mold 130 is clamped to the lower mold 110 by the mold clamping part 142, the mold clamping part of the outer edge part 133 of the upper mold 130 It is possible to prevent the portion outside the portion 142 from floating away from the lower die 110.

It is preferable that the thickness of the part of the mold clamping part 142 forming the vacuum passage 145 that faces the flat part 115 of the lower mold 110 is 5 mm or more. If the thickness of the portion is less than 5 mm, the amount of depression in the portion increases during vacuuming, making it difficult to suppress the outer edge portion 133 of the upper mold 130 from rising.

As shown in FIGS. 7 and 8, a resin channel 148 for supplying resin between the upper mold 130 and the lower mold 110 is provided at the outer edge 133 of the upper mold 130. A part of the convex portion 144 of the upper mold 130 is recessed, and a space formed by the convex portion 144 of the upper mold 130 being fitted into the recess 114 of the lower mold 110 is configured as a resin flow path 148.

The resin flow path 148 is provided so as to go around the outer edge 133 of the upper mold 130. That is, the resin flow path 148 is provided around the outer periphery of the mold part 111 of the lower mold 110. Further, as shown in FIG. 7, the resin flow path 148 includes a thin branch portion that extends to the gap between the upper insert 170 and the lower insert 150. A plurality of branch portions are provided on the upper die 130.

Although the upper mold 130 is provided with a resin flow path 148, the lower mold 110 is not provided with a groove that serves as the resin flow path 148.

Next, a molding process is performed. In the molding process, first, a vacuuming process is performed. In the evacuation process, the mold clamping part 142 of the upper mold 130 is evacuated to perform molding, and the mold part 111 is also evacuated via the evacuation joint part 134 of the upper mold 130.

During evacuation, the edge 139 of the elastic sheet 131 comes into close contact with the outer wall of the pipe section 135 of the joint section 134 on the side of the one end section 137. That is, since the inside of the mold 100 is in a vacuum state and the surface of the mold 100 is under pressure due to the atmospheric pressure outside the mold 100, the elastic sheet 131 of the upper mold 130 is in a state like a vacuum pack. Become. Therefore, the elastic sheet 131 tightly adheres to the joint portion 134.

After this, in the resin injection step, resin is injected into the mold 100 from the resin injection joint 134 and hardened. During resin injection, even if an overflow occurs in which the resin leaks from the resin flow path 148 due to the resin injection pressure becoming higher than the vacuum pressure, the resin is difficult to cross over the side wall of the recess 114 of the lower mold 110. Therefore, the mold clamping pressure of the mold clamping part 142 located further outside the recess 114 can be ensured.

After the resin injection process, a demolding process is performed. Therefore, the upper mold 130 is removed from the upper insert 170. Further, the resin molded product is removed from the lower mold 110 by removing the lower insert 150 from the lower mold 110 with the instrument inserted into the groove 152 of the lower mold 150. During demolding, the tool contacts the lower insert 150, but does not contact the resin molded product. Therefore, the finished resin molded product can be removed from the lower mold 110 without damaging it.

After demolding, as shown in FIG. 13, only thin runners 320 made of resin hardened in the resin channel 148 of the upper mold 130 are formed on the outer edge 310 of the finished resin molded product 300. Therefore, the outer edge portion 310 of the resin molded product 300 can be completed by simply folding the runner 320 at the position indicated by the broken line shown in FIG. Note that FIG. 13 is a cross section corresponding to VII-VII in FIG. 4.

Therefore, in the post-process, the runner 320 of the resin molded product 300 is broken to separate the runner 320 from the resin molded product 300. Further, a finishing process, a hole punching process, etc. are performed on the resin molded product 300. In this way, the resin molded product 300 is completed.

By repeating the above steps, a plurality of resin molded products 300 of the same shape can be manufactured. That is, the joint portion 134 is used repeatedly. However, the joint portion 134 deteriorates with repeated use.

For example, the joint part 134 may change color from translucent to yellow and lose its transparency, the joint part 134 may lose its elasticity, the joint part 134 may be damaged when the joint part 140 is inserted or removed, or the joint part 134 may become damaged. The hardness of the outer wall may change. In such a case, the joint portion 134 is replaced with a new one.

In this manner, by replacing the joint portion 134 with a new one as it deteriorates, it is possible to maintain suppression of vacuum leakage. Further, since the joint portion 134 is only in contact with the elastic sheet 131 of the upper die 130, the joint portion 134 can be easily removed from the through hole 132 of the elastic sheet 131. Therefore, the joint portion 134 can be easily replaced.

As explained above, in this embodiment, the outer edge portion 210 of the glass mat 200 is fixed in advance with the lower insert 150 and the upper insert 170 before the molding process. Therefore, when the resin is injected into the mold 100, the glass mat 200 can be prevented from shifting.

Further, in the cutting process, the protruding portion 220 of the glass mat 200 is cut along each side surface 151, 171 of each nest 150, 170. Thereby, the outer edge 310 of the resin molded product 300 can be adjusted in advance to the shape along each side surface 151, 171 of each nest 150, 170. Therefore, after the demolding process, a trim process of cutting an unnecessary portion of the outer edge 310 of the resin molded product 300 can be eliminated.

Furthermore, since the glass mat 200 is sandwiched between the nests 150 and 170, the size of the glass mat 200 can be adjusted in advance. Therefore, the portion of the outer edge 210 of the glass mat 200 that is cut can be reduced. Therefore, waste of glass mat 200 and resin can be reduced.

In this embodiment, a joint part 134 is used for resin injection and vacuum evacuation. As a result, the elastic sheet 131, which is made of silicone having different hardness, and the joint portion 134 come into close contact with each other. Therefore, since the silicones come into close contact with each other during evacuation, vacuum leakage at the joint portion 134 can be suppressed.

Furthermore, since the elastic sheet 131 is softer than the joint portion 134, atmospheric pressure is applied to the soft edge portion 139 during vacuuming, so that the edge portion 139 firmly adheres to the joint portion 134. That is, the surface contact between the edge 139 and the outer wall surface of the joint portion 134 becomes strong. Therefore, since the joint portion 134 is firmly tightened by the edge portion 139, vacuum leakage can be further suppressed.

As a modification, as shown in FIG. 14, the mold 100 may be configured with a lower mold 110, an upper mold 130, and an upper mold 170 without including the lower mold 150. In this case, the lower mold 110 has a magnet 117. The magnet 117 provides the lower mold 110 with the function of positioning the lower mold 110 and the upper insert 170 without contact, and the function of pressing the glass mat 200 with the lower mold 110 and the upper insert 170. In addition, instead of sandwiching the outer edge 210 of the glass mat 200 between the lower mold 150 and the upper mold 170, the outer edge 210 of the glass mat 200 is sandwiched between the lower mold 110 and the upper mold 170, and the magnet 172 and the magnet 117 The position of the upper insert 170 is fixed with respect to the mold 110. At this time, by arranging the side surface 118 of the lower die 110 and the side surface 171 of the upper insert 170 on the same surface, it becomes easier to cut the protruding portion 220 of the glass mat 200.

(Other embodiments)
The method of manufacturing the resin molded product 300 shown in each of the above embodiments is an example, and the method is not limited to the structure shown above, and other structures that can realize the present invention may be used.

For example, in the above embodiment, a method for manufacturing the resin molded product 300 using the respective nests 150 and 170 in the silicon back construction method has been described, but in other molding methods such as the L-RTM molding method, each of the nests 150 and 170 The resin molded product 300 can also be manufactured using. The L-RTM molding method is a molding method in which a fiber reinforcing material is placed in a resin mold, the mold is clamped, the resin is injected under low pressure under a vacuum state, and the reinforcing material is integrated with the reinforcing base material.

Furthermore, the side surface 171 of the upper insert 170 does not have to be on the same plane as the side surface 151 of the lower insert 150 or the side surface 118 of the lower die 110. For example, the side surface 171 of the upper insert 170 may be located inside the side surface 151 of the lower insert 150 or the side surface 118 of the lower die 110. In this case, the protrusion 220 of the glass mat 200 may be cut along the side surface 171 of the upper insert 170 using a tool such as a rotary cutter.

110 Lower mold 130 Upper mold 150 Lower insert 151 Side surface 152 Groove portion 153 Magnet 170 Upper insert 171 Side surface 172 Magnet 200 Glass mat 210 Outer edge portion 220 Projection portion

Claims (7)

an installation step of installing a glass mat (200) made of glass fiber between the lower mold (110) and the upper mold (130);
a molding step of injecting a resin into the glass mat while drawing a vacuum between the lower mold and the upper mold, and curing the resin;
including;
In the installation process,
a fixing step of preparing an upper insert (170), sandwiching the outer edge (210) of the glass mat between the lower mold and the upper insert, and fixing the position of the upper insert with respect to the lower mold;
After the fixing step, a cutting step of cutting a protrusion (220) of the outer edge of the glass mat that protrudes from the side surface (171) of the upper insert along the side surface of the upper insert;
After the cutting step, an assembling step of assembling the upper mold to the lower mold with a part of the upper mold in contact with the side surface of the upper insert;
A method for manufacturing a resin molded product, including: In the fixing step, the upper mold is provided with a magnet (172), the lower mold is provided with a magnet (153), and a groove (152) is provided on the side surface (151). A device having a lower insert (150) is prepared, and the outer edge of the glass mat is not sandwiched between the lower mold and the upper insert, but the outer edge of the glass mat is sandwiched between the lower insert and the upper insert. , fixing the position of the upper nest with respect to the lower nest by the magnet of the upper nest and the magnet of the lower nest;
In the assembly step, the upper mold is assembled to the lower mold with a part of the upper mold in contact with a side surface of the upper insert and a side surface of the lower insert,
In the molding step, after the resin is cured, the lower insert is removed from the lower mold with an instrument inserted into the groove of the lower mold, thereby removing the resin molded product (300) from the lower mold. The method for manufacturing a resin molded product according to claim 1, comprising a demolding step. In the fixing step, when sandwiching the outer edge of the glass mat between the lower insert and the upper insert, the lower insert is fixed so that the side surface of the upper insert and the side surface of the lower insert are located on the same surface. to fix the position of the upper nest,
The method for manufacturing a resin molded product according to claim 2, wherein in the cutting step, the protruding portion of the glass mat is cut along the side surface of the upper insert and the side surface of the lower insert. 4. The method for manufacturing a resin molded product according to claim 2, wherein in the fixing step, the upper insert and the lower insert are made of a material that is harder than the upper mold and the lower mold. 5. The method for manufacturing a resin molded product according to claim 2, wherein in the fixing step, the upper insert and the lower insert are made of polyacetal. In the installation step, the upper mold is provided with a resin flow path (148) for supplying the resin between the upper mold and the lower mold, and the lower mold is used as the lower mold. The method for manufacturing a resin molded article according to any one of claims 1 to 5, wherein a resin molded article is used that is not provided with the resin flow path. In the installation step, as the lower mold, one having a recess (114) in which an outer edge (113) of the opposing surface (112) facing the upper mold of the lower mold is recessed is used, and as the upper mold. Any one of claims 1 to 6, wherein a portion of the opposing surface (143) facing the lower die that corresponds to the recess protrudes and has a protrusion (144) that is fitted into the recess. The method for manufacturing a resin molded product described in .

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