Resin molding mold and method for manufacturing resin molded article

Abstract

To provide a mold for molding a resin capable of easily positioning a separated mold with high accuracy when the mold is assembled in a container and capable of being easily assembled.SOLUTION: The resin molding mold 50 is used for molding a resin 14 having a hollow part 16 in a container 12, corresponds to the shape of the hollow part 16, comprises a shaft part 52 and a fin part 72, the shaft part 52 and the fin part 72 are separable, and at least one of the shaft part 52 and the fin part 72 has magnets 58, 80.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a mold for molding resin and a method for manufacturing a molded resin product, and more particularly to a mold for molding resin used to mold a molded resin product having a hollow portion inside a container, and a method for manufacturing a molded resin product. [Background technology]

[0002] Resin and metal components used in the bodies and parts of large machinery and devices such as automobiles and electronic equipment are manufactured by molding using casting dies. Casting methods include green sand casting and metal casting. Metal casting has advantages over green sand casting, such as better dimensional accuracy. Patent Document 1 discloses a metal casting product or a metal mold for casting resin components.

[0003] Furthermore, compared to metal parts, resin parts are lighter, rust-resistant, and easier to process, and are therefore used in a variety of industrial fields, such as for pumps, motors, and battery housings. For example, a resin housing is used as a resin part in the electric oil pump described in Patent Document 2. In addition, there are a variety of other molded products that take advantage of the properties of resin raw materials. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2013 / 161396 [Patent Document 2] JP 2019-27432 A Summary of the Invention [Problem to be solved by the invention]

[0005] When manufacturing a resin part having a hollow portion therein, a mold is inserted into a container, resin is poured into the container, and after the resin has hardened, the mold is removed to manufacture the resin part. If the hollow portion of the resin part is smaller than the opening of the molding container for the resin part to be formed, the mold can be easily removed after manufacturing the resin part. In recent years, resin members having hollow portions of various shapes have been manufactured, for example, resin members in which the shape of the hollow portion (the mold to be inserted) is larger than the opening of the molding container have been manufactured. In such cases, it is necessary to separate the mold, insert it into the container, and assemble it inside the container, but there are limitations to how much visual adjustment of the position of the separated mold can be done, and it has been difficult to assemble it with high precision.

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a resin molding mold and a method for manufacturing a resin molded product, which allows the separated molds to be positioned easily and with high precision when assembling the molds inside a container, and which also allows for easy assembly. [Means for solving the problem]

[0007] As a result of intensive research into solving the above-mentioned problems, the inventors discovered that the problems could be solved by providing a magnet in at least one of the separated molds, and thus arrived at the present invention. [1] A resin molding mold used to mold a resin having a hollow portion inside a container, the mold corresponding to the shape of the hollow portion, consisting of a stem portion and a fin portion, the stem portion and the fin portion being separable, and at least one of the stem portion and the fin portion having a magnet. [2] The mold for resin molding described in [1] has the magnets in the shaft portion and the fin portion, and the magnet provided in the shaft portion is provided at a position where the shaft portion and the fin portion are fixed and at a position corresponding to the magnet in the fin portion. [3] A resin molding mold according to [1] or [2], wherein one of the shaft portion and the fin portion has an engaging portion and the other has an engaged portion, and the shaft portion and the fin portion are fixed together by engaging the engaging portion with the engaged portion. [4] A resin molding mold according to any one of [1] to [3], wherein the container has an opening for inserting and removing the stem portion and the fin portion, and the maximum diameter of the resin molding mold in a direction perpendicular to the axial direction of the stem portion is larger than the maximum diameter of the opening. [5] A method for producing a resin molded product using the mold for resin molding according to any one of [1] to [4]. [Effects of the Invention]

[0008] According to the present invention, when assembling the mold inside a container, the separated molds can be positioned easily and with high accuracy, and it is possible to provide a mold for resin molding that can be easily assembled, and a method for manufacturing a resin molded product. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an example of a resin molded product. [Figure 2] FIG. 1 is a diagram showing an example of a resin molding mold. [Figure 3] FIG. 1 is a view of the resin molding mold separated. [Figure 4] FIG. 2 is a view showing a fin portion of a resin molding mold. [Figure 5] 1A to 1C are diagrams illustrating a method for manufacturing a resin molded product. [Figure 6] 1A to 1C are diagrams illustrating a method for manufacturing a resin molded product. [Figure 7] 10A and 10B are diagrams illustrating another embodiment of a resin molding mold. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the mold for resin molding and the method for manufacturing a resin molded product of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.

[0011] [Resin molded products] First, a resin molded product in which a resin having a hollow portion is formed inside a container using the resin molding mold of the present invention will be described. Figure 1 shows an example of the resin molded product, with Figure 1(a) being a longitudinal cross-sectional view of the resin molded product and Figure 1(b) being a transverse cross-sectional view. As shown in FIG. 1, a resin molded product 10 comprises a container 12 that forms the exterior and a resin 14 formed inside the container 12. The resin 14 has a hollow portion 16 therein, which corresponds to the shape of a resin molding mold (hereinafter simply referred to as a "mold") 50 (see FIG. 2), which will be described later. The shape of the hollow portion 16 can be designed appropriately depending on the resin molded product to be formed. Furthermore, the materials of the container 12 and the resin 14 are not particularly limited and can be determined appropriately depending on the resin molded product to be formed. For example, rubber, natural resin, general-purpose plastic, engineering plastic, solid fuel, etc. can be used as the resin 14.

[0012] [Resin molding mold] Next, the resin molding mold of the present invention will be described. The mold 50 of the present invention is used to mold the resin 14 having the hollow portion 16 inside the container 12 described above. FIG. 2 shows an example of a resin molding mold of the present invention, with FIG. 2(a) being a front view of the resin molding mold of the present invention and FIG. 2(b) being a plan view. FIG. 3 shows a resin molding mold separated from the other parts, with FIG. 3(a) being a front view and FIG. 3(b) being a plan view. FIG. 4 shows the fin portion of the resin molding mold. Also, FIGS. 5 and 6 are diagrams illustrating a method for manufacturing a resin molded product. In the front views of FIGS. 2 and 3 and FIGS. 5 and 6, only one fin portion is shown and the other fin portions are omitted to make it easier to understand the configuration of the shaft portion and fin portion.

[0013] 2 and 3, the mold 50 of the present invention comprises a shaft portion 52 and five fin portions 72, which are formed separably from the shaft portion 52. The number of fin portions 72 can be determined appropriately depending on the shape of the hollow portion of the resin molded product.

[0014] The shaft 52 is formed so that the diameter at the tip end is small and the diameter at the rear end is large relative to the insertion direction of the shaft 52 into the container 12, and has a step 54 at the location where the diameter changes. The step 54 has an engaged portion 56 for engaging with an engaging portion 78 (see FIG. 4) of the fin portion 72. Furthermore, the tip side of the shaft 52 has a stopper 57 for preventing the molten resin from flowing out from the opening 18 on the lower end side of the container 12. The stopper 57 is designed to fit the shape of the opening 18 of the container 12 to be used. Furthermore, the rear end of the shaft portion 52 is provided with a fishing tackle 60 for suspending the shaft portion 52 with a crane and inserting it into and removing it from the container 12 .

[0015] The shaft portion 52 also has a magnet 58. The magnet 58 is provided at a position corresponding to a magnet 80 provided on the fin portion 72, which will be described later, when the shaft portion 52 and the fin portion 72 are fixed together.

[0016] 4 is a diagram showing the fin portion 72 of the mold 50. The fin portion 72 corresponds to the shape of the blades extending outward from the center of the hollow portion 16 of the resin molded product 10 to be manufactured. When the resin is a solid fuel, the combustion pressure relative to the combustion time and the like are predetermined by the shape of the hollow portion, and therefore the shape of the fin portion 72 is determined appropriately depending on the performance required of the resin molded product.

[0017] The fin portion 72 has a fishing tackle 82 at its end for suspending the fin portion 72 with a crane to insert and remove it from the container 12. The fin portion 72 also has an engaging portion 78 on the side that contacts the shaft portion 52, which engages with the engaged portion 56 (see FIG. 2) of the shaft portion 52. By engaging the engaged portion 56 of the shaft portion 52 with the engaging portion 78 of the fin portion 72, the shaft portion 52 and the fin portion 72 can be fixed together.

[0018] Furthermore, the fin portion 72 has a magnet 80 on the side that contacts the shaft portion 52. By having the magnet 80, it is easy to bring the fin portion 72 close to the magnet 58 of the shaft portion 52, which makes it easier to bring the shaft portion 52 and the fin portion 72 close to the fixing positions, and makes it easy to fix the shaft portion 52 and the fin portion 72 together. As described above, the mold 50 of the present invention is separable, and is inserted into the container 12 after being separated, and then assembled within the container 12. Therefore, by making it easy to bring the shaft portion 52 and the fin portion 72 close to each other within the container 12, the mold 50 can be easily assembled.

[0019] 2 and 3, the shaft portion 52 and the fin portion 72 are respectively provided with magnets 58, 80, but if either the shaft portion 52 or the fin portion 72 is made of metal, the magnet may be provided on either the shaft portion 52 or the fin portion 72. By forming one of the shaft portion 52 and the fin portion 72 from metal and providing a magnet on the other, the shaft portion 52 and the fin portion 72 can be brought closer to each other.

[0020] Furthermore, the fin portion 72 has a resin layer 84 on the side that contacts the shaft portion 52. By having the resin layer 84, it is possible to improve the adhesion between the shaft portion 52 and the fin portion 72, thereby improving the accuracy of positioning the shaft portion 52 and the fin portion 72. Furthermore, when the shaft portion 52 and the fin portion 72 are formed of metal and a solid fuel is used as the resin 14, it is possible to prevent sparks from being generated by contact between the shaft portion 52 and the fin portion 72, thereby ensuring safety when manufacturing resin molded products.

[0021] Furthermore, the contact area between the shaft portion 52 and the fin portion 72 is formed as a flat surface to improve adhesion. Because the shaft portion 52 of the mold of this embodiment is cylindrical, forming the flat surface can improve adhesion. The shape of the contact area between the shaft portion 52 and the fin portion 72 is not limited to flat surfaces, and is not limited to any particular shape as long as it increases the contact area between the shaft portion 52 and the fin portion 72 and improves adhesion. For example, if the shaft portion 52 is cylindrical and the contact area with the fin portion 72 is arc-shaped, the contact area of ​​the fin portion 72 with the shaft portion 52 can be formed as a recess corresponding to the arc-shaped shape of the shaft portion 52.

[0022] Furthermore, the mold 50 of the present invention preferably has a release agent applied to its surface to improve releasability from the cured resin. Examples of the release agent that can be applied include silicone and fluororesin.

[0023] According to the mold 50 of this embodiment, the mold 50 can be separated into the stem 52 and the fin 72, allowing them to be inserted separately into a container. Furthermore, by providing a magnet on at least one of the stem 52 and the fin 72, the stem 52 and the fin 72 can be brought close to each other inside the container, facilitating assembly of the mold. In particular, by providing magnets on both the stem 52 and the fin 72, the stem 52 and the fin 72 can be brought close to their fixed positions, facilitating assembly of the mold. Therefore, resin molded products having hollow portions with complex shapes can be easily manufactured. Furthermore, since the mold 50 can be separated into the shaft portion 52 and the fin portion 72, it can be preferably used when the maximum diameter of the mold 50 in the direction perpendicular to the axial direction of the shaft portion 52 is larger than the maximum diameter of the opening of the container 12, i.e., when the mold 50 is assembled, it cannot be inserted into the opening of the container 12. In this specification, the "maximum diameter of the opening" refers to the diameter of the opening if it is circular, and refers to the distance between the two most distant points on the circumference of the opening in a plan view if it is polygonal. Furthermore, the "maximum diameter perpendicular to the axial direction of the stem of the mold" refers to the diameter of a circle circumscribing the mold or the major axis of an ellipse circumscribing the mold when the mold is projected onto a plane perpendicular to the axial direction.

[0024] <Manufacturing method for resin molded products> Next, a method for manufacturing the resin molded product 10 will be described with reference to Figures 5 and 6. Note that in Figures 5 and 6, the crane that suspends the shaft portion and fin portion will be omitted. First, as shown in FIG. 5( a), the fin portion 72 is inserted into the container 12 while suspended by a crane and positioned near the edge of the container 12. Next, as shown in FIG. 5( b), the shaft portion 52 is inserted into the container. Then, as shown in FIGS. 5( c) and 5( d), once the shaft portion 52 is inserted into the predetermined position, the magnets 58 and 80 bring the shaft portion 52 and the fin portion 72 close to the fixing position. According to this embodiment, the provision of the magnets 58 and 80 makes it easy to bring the shaft portion 52 and the fin portion 72 close to the fixing position. Furthermore, the attraction by the magnets 58 and 80 improves the accuracy of the fixing position. Next, as shown in FIG. 6( e), the engaging portion 56 on the shaft portion 52 is engaged with the engaging portion 78 on the fin portion 72 to fix the shaft portion 52 and the fin portion 72, and the mold 50 can be assembled in the container 12.

[0025] After assembling the mold 50 in the container 12, molten resin 13 is poured into the container 12 and hardened, as shown in FIG. 6(f). After hardening the molten resin 13 to form resin 14, the mold 50 is removed. To remove the mold 50, first remove the stem 52 from the top of the container 12. As shown in FIG. 4, the stem 52 and the fin 72 are fixed by engaging the engaging portion 78 of the fin 72 with the engaged portion 56 of the stem 52. Therefore, by lifting the stem 52 upward, the mold 50 can be easily separated and removed. After removing the stem 52, the fin 72 is removed from the top of the container 12, and a resin molded product 10 can be produced, as shown in FIG. 6(g).

[0026] Examples of resin molded articles that can be produced using the resin molding mold of the present invention include resin molded articles made using rubber, natural resin, general-purpose plastic, engineering plastic, solid fuel, and the like.

[0027] (Another embodiment) In the above embodiment, the upper part of the shaft portion 52 of the mold is thick and is pulled out from the top of the container, but if the shape of the hollow part of the resin molded product is such that the lower part is larger, the mold can be pulled out from the bottom of the container. 7 is a diagram illustrating a resin molding mold according to another embodiment. Note that the same components as those in the above embodiment are given the same reference numerals and the description thereof will be omitted.

[0028] 7 differs from the mold shown in FIG. 2 in that, when the shank 152 of the mold 100 is inserted into the container 12, the diameter of the shank 152 is larger at the front end and larger at the rear end in the insertion direction of the shank 152 into the container 12. By making the diameter larger at the front end, a step 154 ​​is provided at the location where the diameter changes, and an engaged portion 156 is provided at the step 154. The engaged portion 156 is fixed by engaging with an engaging portion 178 provided on the fin portion 172 from the rear end side in the insertion direction of the shank 152.

[0029] In the mold 100 shown in FIG. 7, by providing magnets 158, 180 on the shaft portion 152 and the fin portion 172, respectively, the shaft portion 152 and the fin portion 172 can be easily fixed and aligned with high precision.

[0030] In the mold 100 shown in Figure 7, the shank 152 and the fin portion 172 are engaged from the rear end side in the insertion direction of the shank 152, so when removing the shank 152 of the mold 100 from the container 12, it is removed from the front end side in the insertion direction of the shank 152 of the container 12 (the bottom side of the container 12). By removing it from the bottom side of the container 12, the shank 152 can be removed along the insertion direction of the engagement portion 178, making it easy to remove the shank 152. After removing the shank 152 from the container 12, the fin portion 172 is removed. The fin portion 172 can be removed from either the top or bottom side of the container 12. 7, it is possible to manufacture a resin molded product having a hollow portion with a different shape from those shown in FIGS. 2 and 3, and it is also possible to easily remove the mold 100 from the container 12. [Industrial Applicability]

[0031] According to the present invention, the separated molds can be assembled easily and with high precision inside the container, so that a resin molded article having a hollow portion can be easily molded. [Explanation of symbols]

[0032] 10 Resin molded products 12 containers 13 Molten resin 14 Resin 16 Hollow part 18 Opening 50, 100 Resin molding mold (mold) 52, 152 Shaft 54, 154 Step 56, 156 Engaged portion 57 Plug part 58, 158 Magnets 60, 82 Fishing equipment 72, 172 Fin section 78, 178 Engagement part 80, 180 magnet 84 Resin layer

Claims

1. A resin molding mold used to mold a resin having a hollow portion inside a container, Corresponding to the shape of the hollow portion, It consists of a shaft portion and a fin portion, The shaft portion and the fin portion are separable, The resin molding mold has a magnet on at least one of the shaft portion and the fin portion.

2. The magnet is provided in the shaft portion and the fin portion, 2. The resin molding mold according to claim 1, wherein the magnet provided on the shaft portion is provided at a position where the shaft portion and the fin portion are fixed and at a position corresponding to the magnet on the fin portion.

3. an engaging portion is provided on one of the shaft portion and the fin portion, and an engaged portion is provided on the other; The resin molding mold according to claim 1 or 2, wherein the shaft portion and the fin portion are fixed together by the engagement between the engaging portion and the engaged portion.

4. the container has an opening for inserting and removing the shaft portion and the fin portion; 3. The mold for resin molding according to claim 1, wherein the maximum diameter of the stem portion of the mold for resin molding in a direction perpendicular to the axial direction is larger than the maximum diameter of the opening.

5. A method for producing a resin molded product using the resin molding mold according to claim 1 or 2.

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