Manufacturing method for resin molded products

Abstract

To provide a method for manufacturing a resin-molded article, which can suppress adhesion of resin to a terminal, which has a flat surface extending from one end of a main body of an object to be molded, due to resin leakage even if resin molding is carried out with the object to be molded in a state of placing in a mold so that a direction perpendicular to an extending direction of a flat surface of the terminal is perpendicular to the mold surface of the mold.SOLUTION: A method for manufacturing a resin-molded article 31 comprises steps for: preparing a mold object 3 that has a main body 3a and a terminal 3b having a flat surface 3c extending from one end of the main body 3a (S1); bringing an elastic resin 4 into close contact with the terminal 3b (S2); placing, after the step S2 for making a close contact with the elastic resin 4, the mold object 3 in a lower mold 20b such that a direction orthogonal to a direction in which the flat surface 3c extends is perpendicular to a mold surface 22d of the lower mold 20b (S3); and clamping the lower mold 20b and an upper mold 20a, and performing resin molding of the mold object 3 (S4).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a resin molded product.

Background Art

[0002] For example, Patent Document 1 describes a method for manufacturing a resin molded coil in which a terminal pin extending from the base of a coil is passed through a through-hole of a bottom plate made of a thermoplastic synthetic resin, and resin molding is performed with the bottom plate attached to the coil.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the method for manufacturing a resin molded coil described in Patent Document 1, when the terminal pin of the coil has a flat surface, it becomes difficult for the bottom plate made of a thermoplastic synthetic resin to adhere to the terminal pin, and resin may leak between the terminal pin and the bottom plate, and resin may adhere to the terminal pin. In particular, resin leakage is likely to occur when resin molding is performed with the coil installed in the mold such that the direction perpendicular to the direction in which the flat surface of the terminal pin extends is perpendicular to the mold surface of the mold.

Means for Solving the Problems

[0005] According to the embodiments disclosed herein, a method for manufacturing a resin molded product is provided, which involves resin molding an object to be molded using a resin molding apparatus comprising an upper mold and a lower mold, and includes the steps of: preparing an object to be molded comprising a main body and a terminal having a flattened surface extending from one end of the main body; applying an elastic resin to the terminal; after applying the elastic resin, placing the object to be molded in the lower mold so that the direction perpendicular to the direction in which the flattened surface extends is perpendicular to the mold surface of the lower mold; and resin molding the object to be molded after clamping the upper mold and the lower mold. [Effects of the Invention]

[0006] According to the embodiments disclosed herein, it is possible to provide a method for manufacturing a resin molded product that can suppress resin adhesion to the terminal due to resin leakage, even when the object to be molded is placed in a mold so that the direction perpendicular to the direction in which the flattened surface of the terminal extending from one end of the main body of the object to be molded extends is perpendicular to the mold surface of the mold. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic plan view of an example of a resin molding system using a resin molding apparatus used in the manufacturing method of the resin molded product of the embodiment. [Figure 2] This is a flowchart of the manufacturing method for the resin molded product according to the embodiment. [Figure 3] This is a schematic partial perspective view of an example of a coil, which is an example of an object to be molded used in the manufacturing method of a resin molded product according to the embodiment. [Figure 4] This is a schematic perspective view illustrating an example of the process of adhering elastic resin to terminals. [Figure 5] This is a schematic perspective view of an example of a lower mold used in the manufacturing method of the resin molded product of the embodiment. [Figure 6] Figure 5 is a schematic plan view of the lower molding die. [Figure 7]This is a schematic side perspective view illustrating an example of the process of placing the object to be molded into the lower mold. [Figure 8] This is a schematic cross-sectional view along line VIII-VIII in Figure 7. [Figure 9] This is a schematic side perspective view illustrating an example of the process of placing the object to be molded into the lower mold. [Figure 10] This is a schematic cross-sectional view along the line XX-XX in Figure 9. [Figure 11] (a) is a schematic plan view of an example of a coil, which is an example of an object to be molded, placed in the lower mold, and (b) is a schematic enlarged plan view of the area enclosed by the rectangle in (a). [Figure 12] This is a schematic perspective view of an example of an upper mold used in the manufacturing method of a resin molded product according to the embodiment. [Figure 13] Figure 12 is a schematic plan view of the upper molding die. [Figure 14] This is a schematic cross-sectional view illustrating an example of the process of applying a protective material to the outer surface of an elastic resin. [Figure 15] This is a schematic cross-sectional view illustrating an example of the process of placing the object to be molded into the lower mold when a protective material is applied to the outer surface of the elastic resin. [Figure 16] This is a schematic plan view illustrating an example of a process in which an object to be molded is resin-molded after the upper and lower molds have been clamped together. [Figure 17] This is a schematic perspective view of an example of a resin molded product manufactured by the resin molded product manufacturing method of the embodiment. [Modes for carrying out the invention]

[0008] The embodiments will be described below. In the drawings used to describe the embodiments, the same reference numerals represent the same part or a corresponding part.

[0009] <Resin Molding System> FIG. 1 is a schematic plan view of an example of a resin molding system using a resin molding apparatus used in the method for manufacturing a resin molded product according to an embodiment. The resin molding system 100 includes a resin molding apparatus 20 including an upper mold 20a and a lower mold 20b described later. The resin molding apparatus 20 enables resin molding of a coil 3 which is an example of a molding object using the upper mold 20a and the lower mold 20b. The resin molding apparatus 20 includes a transfer mechanism having a plunger for supplying resin from a pot 39 to a cavity, and a mold clamping mechanism 48.

[0010] In addition to the resin molding apparatus 20, the resin molding system 100 includes a CPU 1 as a central control device, a storage unit 8 that stores control information such as a control program and a stop processing procedure of the resin molding system 100, a drive mechanism that drives each part described later, and a touch panel 9 (an example of an input unit) that receives an operation command and input of abnormality processing related information from a user and displays various output information of the resin molding system 100. The CPU 1 realizes a control unit 10 that controls the operation of each part of the resin molding system 100, an abnormality detection unit 11 that detects an abnormality of the drive mechanism, and a timing unit 12 that counts the elapsed time by executing a program stored in the storage unit 8.

[0011] The resin molding system 100 is configured by connecting an in-module M1 having an in-magazine 7 or the like for accommodating a plurality of coils 3, a mold module M2 having a resin molding apparatus 20, and an out-module M3 having an out-magazine 72 for accommodating a resin molded product 31. Guides G linearly arranged across each of these modules are provided in the in-module M1, the mold module M2, and the out-module M3. The guide G is a rail-like member for running a loader 40 and an unloader 44 described later. Although the resin molding system 100 shown in FIG. 1 includes two mold modules M2, the resin molding system 100 may include only one mold module M2 or three or more mold modules M2.

[0012] The drive mechanism of the resin molding system 100 may include, for example, a loader 40, a supply unit 42, and an unloader 44. The loader 40 is a transport mechanism for loading the molding object 3 into the resin molding apparatus 20. The supply unit 42 is a transport mechanism for extruding the coil 3 from the in-magazine 7 and transporting it to the alignment mechanism 70. The unloader 44 is a transport mechanism for unloading the resin molded product 31 from the resin molding apparatus 20.

[0013] <Method for manufacturing a resin molded product> FIG. 2 shows a flowchart of the method for manufacturing a resin molded product according to the embodiment. As shown in FIG. 2, the method for manufacturing a resin molded product according to the embodiment includes a step S1 of preparing a molding object, a step S2 of bringing an elastic resin into close contact with a terminal, a step S3 of installing the molding object, and a step S4 of resin-molding the molding object.

[0014] <Step S1> Step S1 can be performed, for example, by preparing a coil 3 which is an example of a molding object as shown in the schematic partial perspective view of FIG. 3. As shown in FIG. 3, the coil 3 which is an example of a molding object includes a main body portion 3a and a terminal 3b having a rectangular flat surface 3c extending in one direction from one end of the main body portion 3a. In the present specification, the "flat surface" means, for example, as shown in FIG. 3, a plane included in the terminal 3b and is one of two planes orthogonal (intersecting) to the direction in which the terminal 3b extends. More specifically, the "flat surface" means a plane having a longer length in the direction orthogonal to the direction in which the terminal 3b extends among these two planes. Also, in the present specification, the "thickness of the terminal" means the shortest length of the length defining the area of the surface having the minimum area among the surfaces constituting the terminal 3b.

[0015] The ratio of the longer of the lengths L1 and L2 of terminal 3b to the thickness t of terminal 3b ((the longer of the lengths L1 and L2 [mm]) / (thickness t [mm])) can be, for example, between 2 and 80. For example, the thickness t of terminal 3b can be about 1.4 mm. Also, the length L1 of terminal 3b can be, for example, about 50 mm. Also, the length L2 of terminal 3b can be, for example, about 16 mm.

[0016] <Process S2> Step S2 can be carried out, for example, by adhering the elastic resin 4 to a portion of the terminal 3b, as shown in the schematic perspective view of Figure 4. In this specification, "adhering to a portion" means that the terminal 3b and the elastic resin 4 are in contact to such an extent that resin leakage from between the terminal 3b and the elastic resin 4 can be suppressed when the object to be molded is placed in the mold and the mold is clamped.

[0017] As the elastic resin 4, any resin that can adhere closely to the terminal 3b can be used as appropriate. As the elastic resin 4, for example, a heat-shrinkable resin having an annular opening can be used. If a heat-shrinkable resin having an annular opening is used as the elastic resin 4, step S2 may be performed by a step of inserting the terminal 3b into the opening of the elastic resin 4 and a step of heating the elastic resin 4. In the step of heating the elastic resin 4, the elastic resin 4 shrinks due to heat while the terminal 3b is inserted into the opening of the elastic resin 4, making it possible to adhere the elastic resin 4 closely to the terminal 3b.

[0018] <Process S3> Step S3 can be performed by placing the object to be molded in the lower mold. Figure 5 shows a schematic perspective view of an example of a lower mold 20b used in the manufacturing method of the resin molded product of the embodiment. Figure 6 shows a schematic plan view of the lower mold 20b shown in Figure 5. As shown in Figures 5 and 6, the lower mold 20b includes a cavity 21 for installing the main body 3a of the coil 3, and a slit 22 extending in one direction from one end of the cavity 21 for installing the terminals 3b of the coil 3. The slit 22 includes a first slit 22a on the cavity 21 side, a second slit 22c on the opposite side of the cavity 21, and a third slit 22b between the first slit 22a and the second slit 22c. That is, in the example shown in Figure 6, the first slit 22a and the third slit 22b are adjacent, and the second slit 22 c and the third slit 22 b They are adjacent to each other.

[0019] The width d2 of the third slit 22b shown in Figure 6 can be made narrower than the width d1 of the first slit 22a. By making the width d2 of the third slit 22b narrower than the width d1 of the first slit 22a, the elastic resin 4 that is in close contact with the terminal 3b can be prevented from being flowed out by the resin during the resin molding of the object to be molded. In addition, the width d3 of the second slit 22c can be equal to the width d2 of the third slit 22b, or wider than the width d2 of the third slit 22b. Furthermore, the width d3 of the second slit 22c can be made wider than the width d1 of the first slit 22a. If the width d3 of the second slit 22c is larger, it is possible to prevent the tip of the terminal 3b from coming into contact with the lower mold 20b when the terminal 3b of the coil 3 is placed in the lower mold 20b, thereby preventing damage to the lower mold 20b. The width d1 of the first slit 22a, the width d3 of the second slit 22c, and the width d2 of the third slit 22b each represent widths in a direction perpendicular to the direction in which the slit 22 extends and parallel to the mold surface 22d of the lower molding die 20b.

[0020] Step S3 can be carried out, for example, as follows. First, as shown in the schematic side view of Figure 7, the coil 3 is transported to the upper part of the lower molding die 20b so that the main body portion 3a of the coil 3 is in a position corresponding to the cavity 21 of the lower molding die 20b, and the elastic member 4 in close contact with the terminal 3b of the coil 3 is in a position corresponding to the first slit 22a of the lower molding die 20b.

[0021] Figure 8 shows a schematic cross-sectional view along line VIII-VIII in Figure 7. Here, for example, as shown in Figure 8, the width D1 of the elastic resin 4 in close contact with the terminal 3b can be made wider than the width d1 of the first slit 22a of the lower mold 20b. In this case, as will be described later, when the elastic resin 4 is installed in the first slit 22a of the lower mold 20b, the elastic force of the elastic resin 4 increases the force with which the elastic resin 4 presses against the wall surface 220 of the first slit 22a of the lower mold 20b. This tends to suppress resin leakage from between the elastic resin 4 and the wall surface 220 of the first slit 22a during the resin molding of the coil 3. Note that the width D1 of the elastic resin 4 in close contact with the terminal 3b means the width in a direction perpendicular to the direction in which the first slit 22a extends and parallel to the mold surface 22d of the lower mold 20b.

[0022] The lower mold 20b may be provided with at least one guide pin 5a extending vertically upward from the bottom surface of the cavity 21 to suppress misalignment of the coil 3 when installing the coil 3 in the lower mold 20b and when resin molding the coil 3. The guide pin 5a can be positioned so as to be able to contact the inner and / or outer surface of the annular winding opening of the main body portion 3a of the coil 3. The lower mold 20b may also be provided with at least one support pin 5b so as to allow the molded resin to flow around the surface of the main body portion 3a on the bottom side of the cavity 21. The support pin 5b can be positioned so as to be able to contact the surface of the main body portion 3a of the coil 3 on the bottom side of the cavity 21. The height h1 of the guide pin 5a can be higher than the height h2 of the support pin 5b.

[0023] Next, as shown in the schematic side perspective view of Figure 9, the coil 3 is installed in the lower mold 20b such that the direction 3f perpendicular to the direction 3e in which the flattened surface 3c of the terminal 3b of the coil 3 extends is perpendicular to the mold surface 22d of the lower mold 20b. At this time, for example, as shown in the schematic cross-sectional view of Figure 10, the elastic resin 4 that is in close contact with the terminal 3b can be installed in the first slit 22a of the lower mold 20b. Alternatively, the coil 3 can be installed in the lower mold 20b such that the guide pin 5a is in contact with the inner circumferential surface of the opening of the annular winding of the main body portion 3a of the coil 3, and the support pin 5b is in contact with the bottom surface of the cavity 21 of the main body portion 3a.

[0024] Figure 11(a) shows a schematic plan view of an example of a coil 3, which is an example of an object to be molded, placed in the lower mold 20b. Figure 11(b) shows a schematic enlarged plan view of the area enclosed by the rectangle in Figure 11(a). As shown in Figures 11(a) and 11(b), the coil 3 can be placed in the lower mold 20b such that a guide pin 5a contacts the inner circumferential surface of the main body 3a, which is an annular winding, in the X direction, and another guide pin 5a contacts the inner circumferential surface of the main body 3a in the Y direction. In this case, the movement of the coil 3 in the X direction and the movement in the Y direction during resin molding can be suppressed.

[0025] Furthermore, the upper mold may also be provided with slits, guide pins, and support pins, similar to the slits 22 in the lower mold 20b. Figure 12 shows a schematic perspective view of an example of an upper mold used in the manufacturing method of the resin molded product of the embodiment. As shown in Figure 12, the upper mold 20a includes a cavity 33 for housing the main body 3a of the coil 3 and a slit 32 for housing the terminals 3b of the coil 3. Here, the cavity 33 of the upper mold 20a is positioned to correspond to the cavity 21 of the lower mold 20b. Also, the slit 32 of the upper mold 20a is positioned to correspond to the slit 22 of the lower mold 20b.

[0026] The slit 32 of the upper mold 20a may include a first slit 32a located at a position corresponding to the first slit 22a of the lower mold 20b, a third slit 32b located at a position corresponding to the third slit 22b of the lower mold 20b, and a second slit 32c located at a position corresponding to the second slit 22c of the lower mold 20b. In this case, when the upper mold 20a and the lower mold 20b are clamped together, the elastic resin 4 in close contact with the terminal 3b can be placed in the first slit 32a of the upper mold 20a. At this time, the upper half of the elastic resin 4 can be housed in the first slit 32a of the upper mold 20a, and the lower half of the elastic resin 4 can be housed in the first slit 22a of the lower mold 20b. The explanation of the first slit 32a, second slit 32c, and third slit 32b of the upper mold 20a is the same as that of the first slit 22a, second slit 22c, and third slit 22b of the lower mold 20b, so the explanation will not be repeated here. In this way, by forming a slit 32 (specifically the first slit 32a) in both the lower mold 20b and the upper mold 20a for installing the elastic resin 4 that is in close contact with the terminal 3b, the installation of the elastic resin 4 can be divided into two steps, in the lower mold 20b and the upper mold 20a. This reduces the amount of elastic resin 4 inserted into the slit 22 or 32 at one time (the contact area between the elastic resin 4 and the slit 22 or 32), making it easier to position the terminal 3b in the mold 20. In addition, the height h1 of the guide pin 5a can be shortened.

[0027] Figure 13 shows a schematic plan view of the upper mold 20a shown in Figure 12. As shown in Figure 13, the upper mold 20a may also be equipped with at least one guide pin 35a and / or at least one support pin 35b. The guide pin 35a of the upper mold 20a may be provided at a position corresponding to the guide pin 5a of the lower mold 20b, or at a position other than the position corresponding to the guide pin 5a of the lower mold 20b. By providing the guide pin 35a in the upper mold 20a, the occurrence of displacement of the coil 3 during resin molding of the coil 3 can be suppressed. In addition, by providing the support pin 35b in the upper mold 20a, the occurrence of lifting of the coil 3 during resin molding of the coil 3 can be suppressed. Further explanations of the guide pin 35a and support pin 35b of the upper mold 20a are the same as those for the guide pin 5a and support pin 5b of the lower mold 20b, respectively, and will not be repeated here.

[0028] <Other processes> The manufacturing method for the resin molded product of the embodiment may include a step of installing a protective material on the outer surface of the elastic resin 4 between step S2 and step S3. The step of installing the protective material can be carried out, for example, by providing a protective material 6 on the outer surface of the elastic resin 4 that is in close contact with the terminal 3b, as shown in the schematic cross-sectional view of Figure 14. By providing this step, when installing the elastic resin 4 into the first slit 22a of the lower mold 20b, as shown in the schematic cross-sectional view of Figure 15, for example, the sliding action can be improved and installation can be facilitated. In addition, by protecting the outer surface of the elastic resin 4 with the protective material 6, it is possible to suppress the breakage of the elastic resin 4 due to friction with the wall surface 220 of the first slit of the lower mold 20b. The protective material 6 may include, for example, a polyimide resin or a polytetrafluoroethylene resin, and as the protective material 6, for example, a polyimide tape can be used. When the elastic resin 4 is heated to make it adhere to the terminal 3b, the protective material 6 may be installed before heating the elastic resin 4, or it may be installed after heating the elastic resin 4.

[0029] <Process S4> Step S4 can be carried out by resin molding the coil 3 after clamping the upper mold 20a and the lower mold 20b, as shown in the schematic plan view of Figure 16. Subsequently, by opening the upper mold 20a and the lower mold 20b, a resin molded product 31 can be manufactured, as shown in the schematic perspective view of Figure 17.

[0030] According to the manufacturing method of the resin molded product of the embodiment, the main body portion 3a of the coil 3 of the resin molded product 31 can be coated with resin, while the terminal 3b having a flattened surface 3c extending from one end of the main body portion 3a can not be coated with resin. This is because, in the manufacturing method of the resin molded product of the embodiment, the resin molding of the main body portion 3a of the coil 3 is performed with the elastic resin 4 in close contact with the terminal 3b of the coil 3 installed in the first slit 32a of the upper molded die 20a and the first slit 22a of the lower molded die 20b. Therefore, the elastic force of the elastic resin 4 can suppress the formation of gaps between the elastic resin 4 and the terminal 3b and between the elastic resin 4 and the walls of the first slits 22a and 32a. The elastic resin 4 can be removed from the terminal 3b of the coil 3 after the resin molding of the coil 3.

[0031] <Note> (Disclosure 1) The method for manufacturing a resin molded product according to Disclosure 1 is a method for manufacturing a resin molded product by resin molding an object to be molded using a resin molding apparatus comprising an upper mold and a lower mold, and includes the steps of: preparing an object to be molded comprising a main body and a terminal having a flattened surface extending from one end of the main body; applying an elastic resin to the terminal; after applying the elastic resin, placing the object to be molded in the lower mold so that the direction perpendicular to the direction in which the flattened surface extends is perpendicular to the mold surface of the lower mold; and clamping the upper mold and the lower mold together to resin mold the object to be molded.

[0032] (Disclosure 2) The method for manufacturing a resin molded article according to Disclosure 2 is the method for manufacturing a resin molded article according to Disclosure 1, wherein the elastic resin is a heat-shrinkable resin having an annular opening, and the step of making the elastic resin adhere includes the step of inserting the terminal into the opening of the elastic resin and the step of heating the elastic resin.

[0033] (Disclosure 3) The method for manufacturing a resin molded article according to Disclosure 3 is the method for manufacturing a resin molded article according to Disclosure 1 or 2, wherein the upper mold and the lower mold each include a cavity for installing the main body and a slit extending in one direction from one end of the cavity for installing the terminal, and the step of installing the object to be molded in the lower mold includes the step of installing the elastic resin, which is in close contact with the terminal, in the slit of the lower mold.

[0034] (Disclosure 4) The method for manufacturing a resin molded article according to Disclosure 4 is the method for manufacturing a resin molded article according to Disclosure 3, wherein the slit includes a first slit on the cavity side and a third slit adjacent to the first slit.

[0035] (Disclosure 5) The method for manufacturing a resin molded product according to Disclosure 5 is the method for manufacturing a resin molded product according to Disclosure 4, wherein the step of placing the object to be molded in the lower mold includes the step of placing the elastic resin in the first slit of the lower mold.

[0036] (Disclosure 6) The method for manufacturing a resin molded article according to Disclosure 6 is the method for manufacturing a resin molded article according to Disclosure 5, wherein the width of the elastic resin is wider than the width of the first slit in the lower mold.

[0037] (Disclosure 7) The method for manufacturing a resin molded article according to Disclosure 7 is a method for manufacturing a resin molded article according to any one of Disclosures 4 to 6, wherein the width of the third slit in the lower mold is narrower than the width of the first slit in the lower mold.

[0038] (Disclosure 8) The method for manufacturing a resin molded article of Disclosure 8 is a method for manufacturing a resin molded article of any one of Disclosures 4 to 7, wherein the second slit is located on the opposite side of the cavity and adjacent to the third slit, and the width of the second slit in the lower mold is wider than the width of the first slit in the lower mold and the width of the third slit in the lower mold.

[0039] (Disclosure 9) The method for manufacturing a resin molded article according to Disclosure 9 is a method for manufacturing a resin molded article according to any one of Disclosures 1 to 8, further comprising the step of installing a protective material on the outer surface of the elastic resin between the step of adhering the elastic resin and the step of installing the object to be molded.

[0040] (Disclosure 10) The method for manufacturing a resin molded article according to Disclosure 10 is the method for manufacturing a resin molded article according to Disclosure 9, wherein the protective material includes a polyimide resin or a polytetrafluoroethylene resin.

[0041] (Disclosure 11) The method for manufacturing a resin molded article according to Disclosure 11 is a method for manufacturing a resin molded article according to any one of Disclosures 1 to 10, wherein the upper mold and the lower mold further include at least one guide pin in the cavity.

[0042] (Disclosure 12) The method for manufacturing a resin molded article according to disclosure 12 is the method for manufacturing a resin molded article according to disclosure 11, wherein the upper mold and the lower mold further include at least one support pin outside the guide pin in the cavity.

[0043] (Disclosure 13) The method for manufacturing a resin molded article of Disclosure 13 is a method for manufacturing a resin molded article of any one of Disclosures 1 to 12, wherein the object to be molded includes a coil.

[0044] As described above, the embodiments have been explained, but it was also planned from the outset that the configurations of each of the embodiments described above could be combined as appropriate.

[0045] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended. [Explanation of Symbols]

[0046] 1 CPU, 3 coil, 3a main body, 3b terminal, 3c flat surface, 4 elastic resin, 5a, 35a guide pins, 5b, 35b support pins, 6 protective material, 7 in magazine, 8 memory unit, 9 touch panel, 10 control unit, 11 anomaly detection unit, 12 timing unit, 20 resin molding apparatus, 20a upper mold, 20b lower mold, 21, 33 cavity, 22, 32 slit, 22a, 32a first slit, 22b, 32b third slit, 22c, 32c second slit, 22d mold surface, 31 resin molded product, 39 pot, 40 loader, 42 supply unit, 44 unloader, 48 clamping mechanism, 70 alignment mechanism, 72 out magazine, 100 resin molding system, 220 wall surface.

Claims

1. A method for manufacturing a resin molded product by resin molding an object to be molded using a resin molding apparatus equipped with an upper mold and a lower mold, A step of preparing the object to be molded, comprising a main body and a terminal having a flattened surface extending from one end of the main body, A step of adhering elastic resin to the terminal, The process of applying the elastic resin in contact with the object to be molded is followed by the step of placing the object to be molded in the lower mold so that the direction perpendicular to the direction in which the flattened surface extends is perpendicular to the mold surface of the lower mold, The process includes clamping the upper mold and the lower mold together to resin-mold the object to be molded, The upper mold and the lower mold each include a cavity for installing the main body and a slit extending in one direction from one end of the cavity for installing the terminal. The step of placing the object to be molded into the lower mold includes the step of placing the elastic resin, which is in close contact with the terminal, into the slit of the lower mold. A method for manufacturing a resin molded product, wherein the step of clamping the upper mold and the lower mold together to resin-molde the object to be molded is performed so as not to form any gaps between the elastic resin and the terminals, and between the elastic resin and the wall surface of the slit in the lower mold and the wall surface of the slit in the upper mold.

2. The elastic resin is a heat-shrinkable resin having an annular opening, The method for manufacturing a resin molded article according to claim 1, wherein the step of adhering the elastic resin includes the step of inserting the terminal into the opening of the elastic resin and the step of heating the elastic resin.

3. The method for manufacturing a resin molded article according to claim 1, wherein the slit includes a first slit on the cavity side and a third slit adjacent to the first slit.

4. The method for manufacturing a resin molded product according to claim 3, wherein the step of placing the object to be molded into the lower mold includes the step of placing the elastic resin into the first slit of the lower mold.

5. The method for manufacturing a resin molded article according to claim 4, wherein the width of the elastic resin is wider than the width of the first slit in the lower mold.

6. The method for manufacturing a resin molded article according to claim 3, wherein the width of the third slit in the lower mold is narrower than the width of the first slit in the lower mold.

7. The method for manufacturing a resin molded article according to claim 1, wherein the elastic resin is provided with a protective material on its outer surface.

8. The method for manufacturing a resin molded article according to any one of claims 1 to 7, wherein the object to be molded includes a coil.

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