Molding method

Abstract

To provide a molding method that enables efficient one-piece molding of resin molded products.SOLUTION: The molding method for integrally molding resin molded products comprises: a molding cavity formation step of forming a molding cavity S by closing two molds 10, 20; and a resin injection step of injecting molten resin Ma, Mb into the molding cavity S in parallel from opposing injection directions D1, D2 through a plurality of injection pipes 11, 21 connected to the two molds 10, 20, a cooling process for cooling the two molds 10, 20 after the resin injection process, and a product removal process for opening the two molds 10, 20 after the cooling process and removing the resin molded product from the mold cavity S.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a molding method for integrally molding a resin molded product. [Background technology]

[0002] In recent years, in the design of vehicle bodies, efforts have been made to achieve both weight reduction and improved collision safety by expanding the use of lightweight materials, such as high-tensile steel plates, aluminum, and even CFRP (carbon fiber reinforced plastic), in place of ordinary steel plates. Furthermore, Cited Document 1 discloses a vehicle resin panel in which an outer panel and an inner panel that form part of a side member of a vehicle body are integrally molded from a resin material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-16260 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, a vehicle side member is a component that makes up the entire side of the vehicle and includes many other parts in addition to the outer and inner panels. Therefore, even if only a portion of the side member is integrally molded from a specified resin material, the number of parts and the number of man-hours required for production remain almost unchanged, since most of the remaining parts are molded individually. Therefore, by integrally molding large resin molded products such as the entire side member, it is possible to reduce the number of parts and the number of man-hours required for production. To achieve this, a technology is needed that can efficiently integrally mold resin molded products regardless of their size or shape.

[0005] The present inventors

[0006] The present invention has been made in view of the above-mentioned problems, and aims to provide a molding method that can efficiently integrally mold a resin molded product. [Means for solving the problem]

[0007] One aspect of the present invention is A molding method for integrally molding a resin molded product, comprising: a molding space forming step of forming a molding space by closing a plurality of molds; a resin injection step of injecting molten resin into the molding space in parallel from opposite injection directions through a plurality of injection pipes connected to the plurality of molds; a cooling step of cooling the plurality of molds after the resin injection step; a molded product removal step of opening the molds after the cooling step and removing the resin molded product from the molding space; a molding method comprising: is located. [Effects of the Invention]

[0008] In the molding method of the above-described embodiment, molten resin is injected into a molding space formed by closing multiple molds in a molding space forming step through multiple injection pipes in a resin injection step. In the resin injection step, the molten resin is injected into the molding space through multiple injection pipes in parallel from opposite injection directions. That is, in this embodiment, the molten resin is injected into the molding space from multiple locations in different directions, preventing the molten resin from being injected in only one direction. This allows the molten resin injected into the molding space to be efficiently spread in a plane in a direction intersecting the injection direction. Furthermore, in this embodiment, the molten resin is injected into the molding space from multiple locations simultaneously or in parallel at the same time. This allows the molten resin to be efficiently filled throughout the molding space in a short time, regardless of the size or shape of the molding space. Subsequently, the multiple molds are cooled in a cooling step, and then the multiple molds are opened in a molded product removal step, where a resin molded product is removed from the molding space. As described above, by devising a process, particularly the resin injection step, it is possible to efficiently mold a resin molded product in one piece regardless of the size or shape of the resin molded product.

[0009] As described above, according to the above-described embodiment, it is possible to provide a molding method that can efficiently integrally mold a resin molded product. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a perspective view of the molding device of the first embodiment in an initial state, seen obliquely from above. [Figure 2] 1 is a cross-sectional view of a resin molded product according to a first embodiment. [Figure 3] FIG. 2 is a flowchart of the panel molding method of the first embodiment. [Figure 4] FIG. 2 is a perspective view showing the state of the molding apparatus of FIG. 1 during a second step. [Figure 5] FIG. 2 is a perspective view showing the molding apparatus of FIG. 1 during a third step. [Figure 6] FIG. 2 is a perspective view showing the molding apparatus of FIG. 1 during a fourth step. [Figure 7]FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. [Figure 8] FIG. 8 is a cross-sectional view showing a state during the fifth step in FIG. 7. [Figure 9] FIG. 2 is a perspective view showing the first stage of the sixth step in the molding apparatus of FIG. 1. [Figure 10] XX line cross-sectional view of FIG. 9. [Figure 11] 11 is a cross-sectional view showing the second stage of the sixth step in FIG. 10. [Figure 12] FIG. 1 is a perspective view of a molding apparatus according to a second embodiment, the perspective view corresponding to FIG. [Figure 13] FIG. 8 is a cross-sectional view of a molding device according to a third embodiment, corresponding to FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0011] Preferred embodiments of the above aspects are described below.

[0012] In the molding method of the above aspect, it is preferable that a plurality of the injection pipes are connected to each of the plurality of molds.

[0013] According to this molding method, by connecting a plurality of injection pipes to each mold, it is possible to improve the effect of filling the entire molding space with molten resin almost uniformly and in a short time.

[0014] In the molding method of the above-mentioned aspect, it is preferable that the plurality of molds consist of a first mold and a second mold, and that in the resin injection process, the properties of the molten resin injected from the injection pipe connected to the first mold and the properties of the molten resin injected from the injection pipe connected to the second mold are different from each other.

[0015] According to this molding method, it is possible to integrally mold a resin molded product using two molten resins with different properties.

[0016] The molding method of the above aspect preferably includes a reinforcing material introduction step of introducing a reinforcing material for the resin molded product into the molding space before the molten resin is injected into the molding space.

[0017] According to this molding method, by carrying a reinforcing material into the molding space in advance in the reinforcing material carrying-in step prior to the resin injection step, the strength of the resin molded product after molding can be increased by the reinforcing material.

[0018] In the molding method of the above aspect, it is preferable that the molding space is partitioned by the reinforcing material into a plurality of resin injection spaces into which the molten resin having the same properties is respectively injected.

[0019] According to this molding method, in addition to the inherent reinforcing function of the reinforcing material, which is to increase the strength of the resin molded product after molding, the reinforcing material can also serve as a partition to divide the molding space into multiple resin injection spaces. This eliminates the need for a dedicated component with this partition function. The partition function of the reinforcing material makes it easier to separate molten resins with different properties among the multiple resin injection spaces in the molding space.

[0020] In the molding method of the above aspect, the resin molded product has an inner-side resin portion that constitutes an inner portion of a side member of a vehicle body, and an outer-side resin portion that constitutes an outer portion of the side member, the outer-side resin portion being harder than the inner-side resin portion, The reinforcing material divides the molding space into two resin injection spaces, In the resin injection process, it is preferable to inject a first molten resin that will become the inner resin portion into one of the two resin injection spaces, and to inject a second molten resin that will become the outer resin portion into the other of the two resin injection spaces.

[0021] According to this molding method, a first molten resin that will become the inner resin portion is injected into one resin injection space separated by a reinforcing material, and a second molten resin that will become the outer resin portion is injected into the other resin injection space separated by a reinforcing material, thereby making it possible to simultaneously mold the inner and outer portions of the vehicle body side member as a single unit.

[0022] Specific embodiments of the above aspects will be described below with reference to the drawings.

[0023] In this specification and drawings, unless otherwise specified, the first direction corresponding to the width direction of the molding device is indicated by arrow X, the second direction corresponding to the depth direction of the molding device is indicated by arrow Y, and the third direction corresponding to the height direction of the molding device is indicated by arrow Z.

[0024] (Embodiment 1) 1. Structure of molding device 101 1, a molding apparatus 101 of embodiment 1 is an apparatus for integrally molding a side member of a vehicle body (a "resin molded product 1" described below) from a resin material. This molding apparatus 101 includes a first mold 10 which is a fixed mold, a second mold 20 which is a movable mold relative to the first mold 10, and a plurality of support shafts 13 which extend parallel to a first direction X from an inner surface 10a of the first mold 10. The second mold 20 is supported by the plurality of support shafts 13 so as to be slidable in the first direction X relative to the first mold 10.

[0025] The first mold 10 (hereinafter simply referred to as "mold 10") has a resin injection space Sa formed by a recess in a portion of its inner surface 10a. Furthermore, a plurality of first injection pipes 11 are connected to the outer surface 10b of this mold 10. The upstream side of each first injection pipe 11 is connected to a resin supply facility (not shown) for the first molten resin Ma, and the downstream side thereof communicates with the resin injection space Sa via a through passage (not shown) that penetrates the interior of the mold 10 in the first direction X. Therefore, the first molten resin Ma supplied from the resin supply facility can be injected in parallel into the resin injection space Sa through the plurality of first injection pipes 11.

[0026] The second mold 20 (hereinafter simply referred to as "mold 20") has a resin injection space Sb formed by a recess in a portion of its inner surface 20a. The resin injection space Sb of the mold 20 cooperates with the resin injection space Sa of the mold 10 to form a molding space S, which will be described later. A plurality of second injection pipes 21 are connected to the outer surface 20b of this mold 20. The upstream side of each second injection pipe 21 is connected to a resin supply facility (not shown) for molten resin, and the downstream side thereof communicates with the resin injection space Sb via a through-path (not shown) that penetrates the interior of the mold 20 in the first direction X. Therefore, the second molten resin Mb supplied from the resin supply facility can be injected into the resin injection space Sb in parallel through the plurality of second injection pipes 21.

[0027] As described above, there are no particular limitations on the number of first injection pipes 11 connected to mold 10 and the number of second injection pipes 21 connected to mold 20. The number of first injection pipes 11 and the number of second injection pipes 21 may be the same, or the number of first injection pipes 11 and the number of second injection pipes 21 may be different.

[0028] 2, the resin molded product 1 of this embodiment has an inner resin part 1a that constitutes the inner part of the side member and an outer resin part 1b that constitutes the outer part of the side member. The resin molded product 1 also has a reinforcing material 2 built in.

[0029] The inner resin portion 1a is made of a first molten resin Ma and constitutes the interior surface of the side member. This inner resin portion 1a corresponds to an assembly in which multiple interior components 1a', including a front pillar inner, a center pillar inner, a roof side inner, a wheelhouse, and trim, are integrated into a side member of a conventional structure. In contrast, the outer resin portion 1b is made of a second molten resin Mb and constitutes the outer surface of the side member. Therefore, this outer resin portion 1b is harder than the inner resin portion 1a (interior components 1a'). This outer resin portion 1b corresponds to an assembly in which multiple components, including a side outer panel and a side inner panel, are integrated into a side member of a conventional structure.

[0030] In order to make the outer-side resin portion 1b harder than the inner-side resin portion 1a, in this embodiment, the first molten resin Ma and the second molten resin Mb are used, each having a different hardness after hardening. That is, the properties of the first molten resin Ma injected through the first injection pipe 11 connected to the mold 10 are different from the properties of the second molten resin Mb injected through the second injection pipe 21 connected to the mold 20. This makes it possible to integrally mold the resin-molded product 1 using two molten resins Ma and Mb with different properties. Furthermore, the first molten resin Ma and the second molten resin Mb may be resins with different hues, glosses, etc.

[0031] The reinforcing member 2 is a strength member made of a material having a higher strength than the inner resin portion 1a and the outer resin portion 1b. As a result, the reinforcing member 2 is built into the resin molded product 1 after molding, and performs a reinforcing function that increases its strength. Note that a portion of the reinforcing member 2 can be made to protrude from the resin molded product 1 and used as a bracket for connecting to the roof or floor.

[0032] 2. Molding method The molding method of the first embodiment is a method for integrally molding the aforementioned resin molded product 1 using the molding apparatus 101 having the above-described structure. Because molds 10 and 20 are used, this method is also called "integral molding." In this molding method, the first step S101 to the sixth step S106 in FIG. 3 are performed in sequence. Note that, if necessary, other steps may be added, or at least one step may be divided into multiple steps.

[0033] 2-1. 1st process 3 is a preparation step for setting the molds 10 and 20 to an initial state. As shown in FIG. 1, the molds 10 and 20 are set to the initial state by placing the mold 10 at the first position P1.

[0034] 2-2.Second process The second step S102 in FIG. 3 is a reinforcing material carrying-in step of carrying in the aforementioned reinforcing material 2. As shown in FIG. 4, the reinforcing material 2 is carried in advance into the resin injection space Sa of the mold 10 before the molten resins Ma and Mb are injected (i.e., before the molds 10 and 20 are closed). The reinforcing material 2 is a flat plate-shaped member, and is carried into the resin injection space Sa with the first direction X as its thickness direction. In this second step S102, for example, a robot arm (not shown) can be used as a carrying means for the reinforcing material 2. Furthermore, if the reinforcing material 2 is divided into multiple members, a jig 30 that can temporarily hold the multiple members together may be used, and this jig 30 may be carried into the resin injection space Sa together with the reinforcing material 2 by a carrying means such as a robot arm.

[0035] 2-3. 3rd process The third step S103 in Fig. 3 is a molding space forming step in which the molding space S is formed by closing the molds 10, 20. As shown in Fig. 5, in this third step S103, the mold 10 is slid from the first position P1 to the second position P2 (see the two-dot chain line), so that the molds 10, 20 are in a mold closed state. Mold clamping is performed with the molds 10, 20 in the mold closed state.

[0036] 2-4. 4th process 3 is a resin injection step of injecting molten resins Ma and Mb into the molding space S. As shown in Fig. 6, in this fourth step S104, a first molten resin Ma is injected through a plurality of first injection pipes 11 connected to a mold 10, and a second molten resin Mb having properties different from those of the first molten resin Ma is injected through a plurality of second injection pipes 21 connected to a mold 20.

[0037] For example, if the molding space S is divided into three blocks in the second direction Y, it is preferable to assign a plurality of first injection pipes 11 and a plurality of second injection pipes 21 to each block. In this case, it is preferable that each block is assigned at least two first injection pipes 11 arranged at different positions in the third direction Z, and at least two second injection pipes 21 arranged at different positions in the third direction Z. This makes it possible to fill the entire molding space S with the molten resins Ma and Mb approximately evenly.

[0038] It is preferable that the injection rates of the molten resins Ma and Mb are set individually depending on the conditions such as the size and shape of the resin injection spaces Sa and Sb. For example, the injection rates of the molten resins Ma and Mb may be set to be the same, or may be set to be different.

[0039] 7, before the injection of molten resins Ma and Mb, the molding space S is divided into two resin injection spaces Sa and Sb by a flat reinforcing material 2. Thus, the reinforcing material 2 not only has its original reinforcing function of increasing the strength of the resin molded product 1 after molding, but also has a partitioning function of dividing the molding space S into two resin injection spaces Sa and Sb. Therefore, in the fourth step S104, a first molten resin Ma to become the inner-side resin portion 1a is injected into one resin injection space Sa, and a second molten resin Mb to become the outer-side resin portion 1b is injected into the other resin injection space Sb.

[0040] The partitioning function of the reinforcing material 2 makes it easy to separate the molten resins Ma and Mb, which have different properties, between the resin injection space Sa and the resin injection space Sb of the molding space S. The two resin injection spaces Sa and Sb are connected in spaces other than the space where the reinforcing material 2 is placed. Therefore, the first molten resin Ma and the second molten resin Mb come into contact with each other in spaces other than the reinforcing material 2 to form a resin boundary. By imparting a partitioning function to the reinforcing material 2, a dedicated component with a partitioning function can be eliminated.

[0041] In this embodiment, the first molten resin Ma changes its injection direction when it comes into contact with the reinforcing material 2 in the resin injection space Sa, and is filled so as to spread out in a plane along the surface of the reinforcing material 2. Similarly, the second molten resin Mb changes its injection direction when it comes into contact with the reinforcing material 2 in the resin injection space Sb, and is filled so as to spread out in a plane along the surface of the reinforcing material 2. First molten resins Ma of the same properties are injected into the resin injection space Sa through each of the multiple first injection pipes 11, and second molten resins Mb of the same properties are injected into the resin injection space Sb through each of the multiple second injection pipes 21.

[0042] In the fourth step S104, molten resins Ma and Mb are injected into the molding space S in parallel from opposing injection directions D1 and D2 through multiple injection pipes 11 and 21. Note that "opposing" here broadly encompasses not only opposing directions but also cases where the directions are not strictly opposing but include opposing directional components. In this embodiment, the two injection directions D1 and D2 are arranged on the same line extending in the first direction X, i.e., the direction lines of the two injection directions D1 and D2 are three-dimensionally aligned. Furthermore, "injecting in parallel" here broadly encompasses not only simultaneous injection of molten resins Ma and Mb from multiple locations, but also simultaneous injection within a certain acceptable time interval, even if not strictly simultaneous. In this embodiment, simultaneous injection of molten resins Ma and Mb is employed.

[0043] 2-5. 5th process 3 is a cooling step for cooling the molds 10, 20 after the fourth step S104. Although not specifically shown, in this fifth step S105, the molds 10, 20 may be cooled from the outside by a cooling device, may be cooled by a refrigerant flowing through a refrigerant flow path formed inside the molds 10, 20, or may be cooled naturally. According to this fifth step S105, as shown in FIG. 8, the first molten resin Ma and the second molten resin Mb are cooled and hardened to form a resin-molded product 1 in the molding space S.

[0044] 2-6.6th step 3 is a molded product removal step in which the molds 10, 20 are opened after the fifth step S105 and the resin molded product 1 is removed from the molding space S. This sixth step S106 includes a first stage in which the mold 10 is slid from the second position P2 (see the two-dot chain line) to the first position P1 to open the molds 10, 20, as shown in Figures 9 and 10, and a second stage in which the resin molded product 1 is removed from the molds 10, 20 using a removal means such as a robot arm, as shown in Figure 11. According to this sixth step S106, the resin molded product 1 can be removed from the molds 10, 20.

[0045] 3. Effects According to the above-described first embodiment, the following effects can be obtained.

[0046] In the molding method of the first embodiment, in the third step S103, molten resins Ma and Mb are injected into the molding space S formed by closing the molds 10 and 20. In the fourth step S104, the molten resins Ma and Mb are injected into the molding space S through the multiple injection tubes 11 and 21 in parallel from opposite injection directions. That is, the molten resins Ma and Mb are injected into the molding space S from multiple locations in different directions, preventing the molten resins Ma and Mb from being injected in only one direction. This allows the molten resins Ma and Mb injected into the molding space S to be efficiently spread in a plane in a direction intersecting the injection direction. Furthermore, the molten resins Ma and Mb are injected into the molding space S from multiple locations simultaneously or in parallel within the same time period. This allows the molten resins Ma and Mb to be efficiently filled throughout the entire molding space S, regardless of the size or shape of the molding space S, in a short time. Thereafter, in a fifth step S105, the molds 10, 20 are cooled, and then in a sixth step S106, the molds 10, 20 are opened and the resin molded product 1 is removed from the molding space S. As described above, by devising the processing of the fourth step S104 in particular, it is possible to efficiently mold the resin molded product 1 as a single unit regardless of the size, shape, etc. of the resin molded product 1.

[0047] Therefore, according to the first embodiment, it is possible to provide a molding method that can efficiently integrally mold the resin molded product 1.

[0048] Furthermore, according to the molding method of embodiment 1, by connecting multiple injection pipes 11, 21 to each mold, the effect of filling the molten resins Ma, Mb almost uniformly throughout the entire molding space S in a short time can be enhanced.

[0049] Furthermore, according to the molding method of the first embodiment, it is possible to integrally mold the side members of the vehicle body with resin material by injecting a first molten resin Ma that will become the inner resin portion 1a into one resin injection space Sa that is separated by the reinforcing material 2, and injecting a second molten resin Mb that will become the outer resin portion 1b into the other resin injection space Sb that is separated by the reinforcing material 2. This makes it possible to reduce the number of parts for the side members, the number of man-hours required for production, and the logistics costs required for logistics.

[0050] When the side members of the vehicle body are integrally molded from a resin material, it is preferable to use a second molten resin Mb with the color required for the outer resin portion 1b. This allows the outer resin portion 1b to be finished with only a final top coat, eliminating the need for an undercoat, which is normally applied to a metal outer panel for color painting.

[0051] Furthermore, resin materials can be melted at lower temperatures than metal materials and are easy to cool. This allows the equipment for this process to be made smaller, saving space. This also reduces the cost of the equipment itself, as well as the energy and carbon dioxide emissions required to operate the equipment.

[0052] Next, other embodiments related to the above-described embodiment 1 will be described with reference to the drawings. In the other embodiments, the same elements as those in embodiment 1 are denoted by the same reference numerals, and the description of the same elements will be omitted.

[0053] (Embodiment 2) As shown in Figure 12, molding apparatus 102 of embodiment 2 differs from that of embodiment 1 (see Figure 1) in that additional connection points are provided for injection pipe 11 and injection pipe 21. Injection pipe 11 is connected to mold 10 not only from first direction X but also from second direction Y and third direction Z. Similarly, injection pipe 21 is connected to mold 20 not only from first direction X but also from second direction Y and third direction Z. That is, in molding apparatus 102, injection pipe 11 is provided so that the first molten resin Ma is injected in the three directions of first direction X, second direction Y, and third direction Z, and injection pipe 21 is provided so that the second molten resin Mb is injected in the three directions of first direction X, second direction Y, and third direction Z.

[0054] According to the molding method of the second embodiment, it is possible to further improve the effect of filling the molten resins Ma and Mb almost uniformly over the entire molding space S in a short time.

[0055] In addition, the same effects as those of the first embodiment are achieved.

[0056] In a modification particularly related to the present embodiment, the injection pipe 11 may be provided so that the first molten resin Ma is injected in two directions, the first direction X and the second direction Y, or the first direction X and the third direction Z, or the injection pipe 21 may be provided so that the second molten resin Mb is injected in two directions, the first direction X and the second direction Y, or the first direction X and the third direction Z.

[0057] (Embodiment 3) As shown in FIG. 13, the molding apparatus 103 of embodiment 3 differs from that of embodiment 1 (see FIG. 7) in the relationship between the injection direction D1 of the first molten resin Ma through the injection pipe 11 and the injection directions D2', D2'' of the second molten resin Mb through the injection pipe 21. In this case, both injection directions D2', D2'' are inclined with respect to the injection direction D1, but include a directional component that faces in the opposite direction to the injection direction D1. Therefore, both injection directions D2', D2'' correspond to injection directions that face the injection direction D1, similar to the injection direction D2 of embodiment 1.

[0058] The molding method of embodiment 3 is the same as the molding method of embodiment 1, except that the relationship between the injection direction D1 and the injection directions D2', D2'' is different. Therefore, according to embodiment 3, like embodiment 1, it is possible to provide a molding method that can efficiently mold the resin molded product 1.

[0059] In addition, the same effects as those of the first embodiment are achieved.

[0060] 4. Modifications The present invention is not limited to the exemplary embodiments described above, and various applications and modifications are possible without departing from the scope of the present invention. For example, the following embodiments can be implemented by applying the above embodiments.

[0061] In the above embodiment, the reinforcing material 2 has a partition function of dividing the molding space S into resin injection spaces Sa and Sb in addition to a reinforcing function of increasing the strength of the resin molded product 1, but instead, the reinforcing function and the partition mechanism may be realized by separate members. For example, when the reinforcing material 2 has only a reinforcing function, the shape of the reinforcing material 2 is not particularly limited, and a shape other than a flat plate (for example, a block shape, a rod shape, etc.) may be adopted.

[0062] In the above embodiment, an example was given of the case where the first molten resin Ma and the second molten resin Mb have different properties, but instead, the first molten resin Ma and the second molten resin Mb may have the same properties.

[0063] In the above embodiment, the case where the resin molded article 1 incorporates the reinforcing material 2 has been exemplified, but the resin molded article 1 may be made of only a resin material if the strength can be ensured without the reinforcing material 2. In this case, the third step S103 in Fig. 3 can be omitted.

[0064] In the above embodiment, the molding space S is formed by closing two molds 10, 20, but the number of molds is not limited to this. For example, the molding space S may be formed by closing three or more molds.

[0065] In the above embodiment, an example has been given in which one reinforcing material 2 divides the molding space S into two resin injection spaces Sa and Sb, but the number of reinforcing materials 2 and the number of resin injection spaces formed by the reinforcing materials 2 are not limited to this. For example, a plurality of reinforcing materials 2 may be used. Furthermore, one or a plurality of reinforcing materials 2 may divide the molding space S into three or more resin injection spaces.

[0066] In the above embodiment, a molding method for integrally molding a side member of a vehicle body using a resin material has been exemplified, but this molding method can also be applied to molding vehicle body components other than side members, such as a roof, hood, floor, bumper, instrument panel, etc. [Explanation of symbols]

[0067] REFERENCE SIGNS LIST 1...Resin molded product, 1a...Inner side resin part, 1b...Outer side resin part, 2...Reinforcing material, 10...First mold (mold), 11...First injection pipe (injection pipe), 20...Second mold (mold), 21...Second injection pipe (injection pipe), Ma...First molten resin (molten resin), Mb...Second molten resin (molten resin), D1, D2, D2'...Injection direction, S...Molding space, Sa, Sb...Resin injection space, S101 to S106...Molding method, S102...Second step (reinforcing material carrying-in step), S103...Third step (mold space forming step), S104...Fourth step (resin injection step), S105...Fifth step (cooling step), S106...Sixth step (molded product removal step)

Claims

1. A molding method for integrally molding a resin molded product, comprising: a molding space forming step of forming a molding space by closing a plurality of molds; a resin injection step of injecting molten resin into the molding space in parallel from opposite injection directions through a plurality of injection pipes connected to the plurality of molds; a cooling step of cooling the plurality of molds after the resin injection step; a molded product removal step of opening the molds after the cooling step and removing the resin molded product from the molding space; A molding method comprising the steps of:

2. The molding method according to claim 1 , wherein a plurality of the injection pipes are connected to each of the plurality of molds.

3. the plurality of molds include a first mold and a second mold, 3. The molding method according to claim 1, wherein in the resin injection process, the properties of the molten resin injected from the injection pipe connected to the first mold and the properties of the molten resin injected from the injection pipe connected to the second mold are different from each other.

4. The molding method according to claim 3 , further comprising a reinforcing material carrying-in step of carrying a reinforcing material for the resin molded product into the molding space before the molten resin is injected into the molding space.

5. The molding method according to claim 4 , wherein the reinforcing member divides the molding space into a plurality of resin injection spaces into which the molten resin having the same properties is injected.

6. the resin molded product has an inner-side resin portion that constitutes an inner portion of a side member of a vehicle body, and an outer-side resin portion that constitutes an outer portion of the side member, the outer-side resin portion being harder than the inner-side resin portion; The reinforcing material divides the molding space into two resin injection spaces, 6. The molding method according to claim 5, wherein in the resin injection process, a first molten resin that will become the inner resin portion is injected into one of the two resin injection spaces, and a second molten resin that will become the outer resin portion is injected into the other of the two resin injection spaces.

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