JP5640871B2 - Resin molded product and manufacturing method thereof - Google Patents

Description

  The present invention relates to a resin molded product in which a terminal plate is exposed on the surface and an electrode plate extended from the terminal plate is insert-molded. In particular, the terminal board has a bolt insertion hole, and a resin molding in which a nut that aligns the screw hole with the bolt insertion hole is arranged in a resin molded product located on the back surface of the terminal board. Related to goods. Moreover, it is related with the manufacturing method of the resin molded product.

  Various resin molded products in which a terminal plate is exposed on the surface and an electrode plate extended from the terminal plate is insert-molded have been proposed as cases for incorporating power elements. The terminal plate has a bolt insertion hole, and a nut is disposed on the back surface thereof. The terminal plate and the external electrode plate in contact with the terminal plate are screwed together with the bolt passing through them and the nut. It is done to conclude. The nut is disposed in the resin molded product. The arrangement is such that the screw holes of the nut are aligned with the bolt insertion holes of the terminal plate.

  Japanese Unexamined Patent Publication No. 09-0669603 (Patent Document 1) discloses a resin molded product 6. The resin molded product 6 includes a resin nut holder 2 that accommodates the nut 1, a terminal plate 4 provided with bolt insertion holes 3, and a terminal plate 4 that is integrally extended from the terminal plate and has an L-shaped cross section. And an electrode plate 5 that is bent as it is formed. The terminal plate 4 is exposed on the surface of the resin molded product 6, and the resin nut holder 2 and the electrode plate 5 are insert-molded while maintaining a predetermined interval.

The resin molded product 6 disclosed in Patent Document 1 will be described with reference to FIG.
The resin nut holder 2 is provided with a bottomed recessed portion 7. A nut 1 is accommodated in the recessed portion 7, and the nut 1 has one side having a screw hole looked outside, and the other side is covered with a resin nut holder 2. The nut 1 is accommodated in the recessed portion 7 of the resin nut holder 2 in a state where rotation within the resin nut holder 2 can be prevented. For example, the recessed portion 7 is formed in a slightly larger shape similar to the outer shape of the nut 1. And the resin nut holder 2 which accommodated the said nut 1 is insert-molded in the resin molded product 6, and the surface of the nut 1 currently peeping outside and the outer surface of the resin molded product 6 are made into the same surface. Further, an electrode plate 5 which is integrally extended from the terminal plate 4 and bent so as to have an L-shaped cross section with the terminal plate 4 is inserted into the resin molded product 6 together with the resin nut holder 2 containing the nut 1. Molding. Further, the terminal plate 4 is exposed on the surface, and is opposed to the surface of the nut 1 viewed from the outside so that the bolt insertion hole 3 and the screw hole of the nut 1 are aligned.

  Patent Document 1 does not specifically disclose the above-described insert molding, but it is carried out as follows according to a conventional method. First, a molding die (not shown in Patent Document 1) for the resin molded product 6 is prepared. In the molding cavity of this molding die, when the nut 1 is accommodated in the recessed portion 7 of the resin nut holder 2, the central axis of the bolt insertion hole 3 of the terminal plate 4 and the central axis of the screw hole of the nut 1 are Are arranged so that the resin nut holder 2, the terminal plate 4 and the electrode plate 5 are disposed. First, the resin nut holder 2 is installed at the corresponding location in the molding cavity of the molding die, and then the nut 1 is received and held in the recessed portion 7 of the resin nut holder 2. The nut 1 and the recessed portion 7 have a dimensional relationship in which a slight gap is formed between the side walls of the nut 1 and the recessed portion 7. Further, the terminal plate 4 and the electrode plate 5 are installed at the predetermined location. When these preparations are completed, the molding die is clamped, molten resin is injected into the molding cavity, and the electrode plate 5 and the resin nut holder 2 are integrally insert-molded together with the resin molded product 6. . As a result, as shown in FIG. 8, the surface of the resin nut holder 2 in which the nut 1 is looked out and the outer surface of the resin molded product 6 are the same surface, and the terminal plate 4 exposed on the surface is exposed. A resin molded product 6 having a structure in which the center axis of the bolt insertion hole and the screw hole of the nut 1 coincide is formed.

Japanese Patent Laid-Open No. 2004-106468 (Patent Document 2) discloses a resin molded product having a similar structure to that disclosed in Patent Document 1. The resin molded product 6 does not use the resin nut holder 2 in Patent Document 1. Instead, as shown in FIG. 9, one side of the surface of the nut 1 having the screw hole is brought into contact with the terminal plate 4, and the central axis of the screw hole 8 of the nut 1 and the bolt insertion hole 3 of the terminal plate 4 is aligned. This is an integrated assembly. In addition, the other side of the surface having the screw hole 8 of the nut 1 is sealed.
Such an assembly is installed at a predetermined location in the molding cavity, the mold is clamped, molten resin is injected into the molding cavity, and the electrode plate 5 and the nut 1 are molded with resin. Insert molding is performed integrally with the product 6. Accordingly, as shown in FIG. 9, one side of the surface of the nut 1 having the screw holes 8 and the outer surface of the resin molded product 6 are the same surface, and the bolt insertion holes 3 of the terminal plate 4 exposed on the surface. A resin molded product 6 having a structure in which the central axes of the screw holes 8 of the nut 1 coincide with each other is molded.

  In any of the resin molded products 6 disclosed in Patent Document 1 and Patent Document 2, insert molding is not performed in a state where the terminal plate 4 is installed in the molding cavity and is in close contact with the inner wall surface of the molding cavity. Don't be. As a result, the surface of the terminal plate 4 in close contact with the inner wall surface of the molding cavity is not covered with the molten resin for injection molding, and the surface of the terminal plate 4 is exposed on the surface of the resin molded product 6. ing. On the other hand, the back side of the terminal plate 4 (surface facing the nut 1) constitutes a molding space in the molding cavity during insert molding. Therefore, after the insert molding, the back side of the terminal plate 4 and the resin molded product 6 are in close contact except for the region facing the nut 1.

  As shown in FIG. 10, the terminal plate 4 and the external electrode plate 9 in contact with the terminal plate 4 are fastened by screwing a bolt 10 passing through them and the nut 1.

JP 09-069693 A JP 2004-106468 A

In the techniques disclosed in Patent Document 1 and Patent Document 2, since the terminal plate and the electrode plate are usually manufactured by punching a metal plate, sagging and burrs are generated on the punched end surface. In order to increase the positioning accuracy and prevent the intrusion of the molten resin during molding of the resin molded product when the terminal board having such burrs is installed at a predetermined location in the molding cavity, If the clearance is made small, there is a concern that the burrs are caught on the positioning member and become an obstacle, and the terminal board cannot be installed at a predetermined location. In order to avoid this, if the clearance is increased, the above-mentioned worry does not occur, but the terminal plate cannot be sufficiently brought into close contact with the inner wall surface of the molding cavity, and the injection molded molten resin enters the gap, Part of the surface of the terminal board may be covered with a resin layer.
The external electrode plate is brought into contact with the terminal plate of the resin molded product thus molded, and the terminal plate and the external electrode plate are fastened by screwing a bolt penetrating the terminal plate and the external electrode plate into a nut on the back of the terminal plate. Then, the resin layer covering the terminal plate surface is interposed between the terminal plate and the external electrode plate in a state where the fastening pressure is received. There is a concern that the resin layer that continues to receive pressure undergoes a creep phenomenon, the tightening torque of the bolts and nuts decreases, and the fastening is loosened.
In addition, a resin layer may be formed by injection molded molten resin entering the gap between the terminal plate and the nut surface on the back of the terminal plate. Also in this case, there is a concern that the terminal plate and the external electrode plate are loosened similarly to the above due to the creep phenomenon of the resin layer.
The above-mentioned concerns are not absent even when the processed end face of the terminal board has no burrs and the clearance with the positioning member can be reduced.

  The present invention relates to a resin nut holder that accommodates a nut, a terminal plate provided with bolt insertion holes, and an electrode that is integrally extended from the terminal plate and bent so that the cross-sectional shape of the terminal plate is L-shaped. A resin plate, the surface of the terminal plate is exposed, the back surface is in contact with a resin nut holder, and the resin nut holder and the electrode plate are insert-molded at a predetermined interval. Intended for molded products.

The first problem to be solved by the present invention is that, in the resin molded product, the surface of the terminal plate is not covered with the resin layer of the injection molding, and the injection molding is melted in the gap between the terminal plate and the nut surface on the back of the terminal plate. It is to provide a resin molded product in which resin does not enter. Moreover, it is providing the manufacturing method of the said resin molded product.
The second problem is that, in addition to the first problem, when the resin nut holder and the electrode plate are insert-molded at a predetermined interval, a thick wall that is filled with an injection-molded molten resin therebetween. It is to suppress molding defects such as sink marks, voids and defective dimensions.

The resin molded product according to the present invention employs the following basic configuration.
That is, a resin nut holder that accommodates a nut, a terminal plate provided with bolt insertion holes, an electrode plate that is integrally extended from the terminal plate and bent so that the cross-sectional shape of the terminal plate is L-shaped It has. The nut is accommodated in a recessed portion provided in the resin nut holder in a state where one side of a surface having a screw hole can be seen outside and rotation can be prevented. The terminal plate is opposed to the surface of the nut looked outside so that the bolt insertion hole and the screw hole of the nut are aligned, and the electrode plate is opposed to the outer surface of the resin nut holder. Yes. The terminal plate is exposed on the surface, and is a resin molded product having a basic configuration in which the resin nut holder and the electrode plate are insert-molded at a predetermined interval.

In order to solve the first problem, in the resin molded product according to the present invention, the terminal plate is held by being fitted to a step portion provided in a resin nut holder. Thereby, the positional relationship between the terminal plate and the electrode plate extended from the terminal plate and the resin nut holder is regulated. The lower block of the resin nut holder is embedded in the resin molded product from the front side to the entire rear side, and at least a portion of the electrode plate facing the resin nut holder is resin molded. It is insert-molded so as to be embedded in the product (claim 1).
Here, the lower side of the resin nut holder means a side where the resin nut holder is opposed to the electrode plate while maintaining a predetermined interval. The upper side of the resin nut holder means the side opposite to the lower side. In addition, the rear side of the resin nut holder is an extension of the electrode plate that is integrally extended by bending so that the cross-sectional shape is L-shaped from the terminal plate fitted to the step of the resin nut holder. Say the side. The front side of the resin nut holder means the side opposite to the rear side, that is, the side on which the terminal plate is arranged. The same applies hereinafter.
You may make it leave the block which is not embed | buried in the resin molded product on the front side and the upper side of the said lower side block of the resin nut holder embed | buried in the resin molded product (Claim 4).

  In order to solve the second problem in addition to the first problem, the resin molded product according to the present invention is the above-described first aspect, wherein the resin nut holder is provided between the outer surface of the resin nut holder and the electrode plate opposed thereto. Further, a rib provided so as to protrude integrally from the resin nut holder is disposed, and the tip of the rib is brought into contact with the electrode plate, and insert molding is performed (Claim 5). The molten resin injected at the time of the insert molding is filled in the space between the outer surface of the resin nut holder and the electrode plate facing the resin nut holder, except for the portion occupied by the ribs.

The manufacturing method of the resin molded product according to the present invention is as follows.
A nut, a resin nut holder that accommodates the nut, a terminal plate provided with a bolt insertion hole, and an electrode that is integrally extended from the terminal plate and bent so that the cross-sectional shape of the terminal plate is L-shaped A board is prepared, and it is based on going through the following 1st processes-4th processes.
The first step is a step in which the nut is accommodated in a recessed portion provided in the resin nut holder so that one side of the surface having the screw hole of the nut can be looked out and rotation of the nut can be prevented. In the second step, the terminal plate, the electrode plate, and the terminal plate are positioned so that the bolt insertion hole of the terminal plate is aligned with the screw hole of the nut, and the electrode plate faces the outer surface of the resin nut holder. This is a step of defining the positional relationship with the resin nut holder. The third step is a step of positioning and clamping the resin nut holder and the electrode plate in a molding cavity of a resin molded product molding die so that the terminal plate is exposed on the surface. The fourth step is a step of injecting molten resin into the molding cavity and insert-molding the resin nut holder and the electrode plate while maintaining a predetermined distance therebetween.
The method for producing a resin molded product according to the present invention is characterized by the second step, the third step, and the fourth step in the first to fourth steps. That is, in the second step, the terminal plate is fitted and held in a stepped portion provided on a resin nut holder, and the nut and resin made to define the positional relationship between the terminal plate and electrode plate and the resin nut holder are defined. A step of constructing an assembly of a nut holder, a terminal plate and an electrode plate, wherein the third step isolates the surface of the terminal plate from the molding cavity and positions it outside the molding cavity, and lower blocks of the resin nut holder Is positioned in the molding cavity by bringing a partial surface region of the resin nut holder into close contact with the positioning wall provided in the molding cavity, and the frontmost part surface on the front side of the resin nut holder is The step of clamping the mold so as to abut the mold surface of the molding die, wherein the fourth step includes a block and an electric circuit facing the molding cavity of the resin nut holder. And a part that relative to at least the outer surface of the resin nut holder plate is a step of embedding in a resin (claim 7).
In the three steps, on the upper side and the front side of the lower block, a region close to the positioning wall provided in the molding cavity may be left on the rear side following the foremost part (claim 10).

  Preferably, in the above-mentioned claim 7, a rib provided so as to protrude integrally from the resin nut holder is disposed between the outer surface of the resin nut holder and the electrode plate opposed thereto, and the tip of the rib is arranged. The assembly brought into contact with the electrode plate is insert-molded (claim 11). When the molten resin is injected into the molding cavity of the insert molding, the electrode plate is supported by a rib that is in contact with the tip of the electrode plate. Moreover, since the injected molten resin is filled in the space between the outer surface of the resin nut holder and the electrode plate opposite to it except for the portion occupied by the rib, the amount of filled resin is The volume of is reduced.

As described above, in the present invention, the nut and the resin nut holder that hold the terminal plate fitted to the stepped portion of the resin nut holder and define the positional relationship between the terminal plate and the electrode plate and the resin nut holder And an assembly of terminal plates and electrode plates. Therefore, it is not necessary to define the positional relationship between these members by installing a predetermined location in the molding cavity. Then, the surface of the terminal plate is isolated from the molding cavity and positioned outside the molding cavity, and the resin nut holder is positioned in the molding cavity so that the lower block of the resin nut holder faces the molding cavity. The mold is clamped so that the foremost surface on the front side of the resin nut holder comes into contact with the molding die surface outside the molding cavity. As a result, the assembly is positioned, so that it is not necessary to install an electrode plate positioning member in the molding cavity. In addition, since the resin nut holder is clamped with a molding die, the resin nut holder is in close contact with the mold clamping surface of the molding die due to the elasticity of the resin nut holder, and the injection molding resin for insert molding is resin. There is no leakage from the interface between the nut holder and the clamping surface.
As described above, the surface of the terminal board is not disposed in the molding cavity before and after the molding of the resin molded product, and there is no leakage of the injection molten resin, so that the surface of the terminal board is covered with the resin layer. Don't worry. Similarly, there is no concern that a resin layer is formed on the interface between the terminal plate and the nut surface located on the back surface thereof. Since there is no terminal plate installation location in the molding cavity, there is no concern about the occurrence of metallic foreign matter due to the removal of burrs and the like on the end face of the terminal plate.
Since the resin nut holder is positioned in the molding cavity, the resin nut holder can be pushed into a predetermined position of the molding cavity using the resin elasticity of the resin nut holder. Accordingly, it is difficult for a gap to be formed on the surface where the resin nut holder is positioned in the molding cavity, and the occurrence of burrs is reduced. Clearance design is also easy.

  When a rib provided so as to protrude integrally from the resin nut holder is disposed between the outer surface of the resin nut holder and the electrode plate opposed thereto, the injected molten resin is occupied by the rib. Except for the portion, the space between the outer side surface of the resin nut holder and the electrode plate opposed thereto is filled, so that the amount of filled resin is reduced by the volume of the rib. Therefore, molding defects such as sink marks, voids, and dimensional defects in this portion that tend to be thick can be suppressed. Further, at the time of injection molding, the electrode plate is supported by the tip of a rib that is in contact with the electrode plate. Therefore, the electrode plate can be prevented from being deformed by the injection pressure of the molten resin.

In embodiment of this invention, it is a perspective view explaining the positional relationship of a nut, a resin-made nut holder, a terminal plate, and an electrode plate. In embodiment of this invention, it is a perspective view which shows the assembly which consists of a nut, a resin-made nut holder, a terminal plate, and an electrode plate. It is a principal part perspective view of the molded product which insert-molded the assembly of FIG. 2 to the resin molded product. It is sectional drawing which follows the A-A 'line in FIG. FIG. 4 is a sectional view taken along line B-B ′ in FIG. 3. In embodiment of this invention which shape | molds a secondary molded product by using the assembly in FIG. 2 as an insert, it is explanatory drawing which shows the positional relationship of the molding die of a secondary molding, and an insert. The state before mold clamping is shown. In embodiment of this invention which shape | molds a secondary molded product by using the assembly in FIG. 2 as an insert, it is explanatory drawing which shows the positional relationship of the molding die of a secondary molding, and an insert. The state after mold clamping is shown. It is principal part sectional drawing of the conventional resin molded product. It is principal part sectional drawing of the other conventional resin molded product. FIG. 10 is a cross-sectional view of a principal part showing a state in which an external electrode plate is fastened in the resin molded product shown in FIG. 9.

In carrying out the present invention, the resin nut holder and the resin constituting the resin molded product are polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polybutylene-ethylene terephthalate (PBT-PET copolymer resin), polyether. -Ether ketone (PEEK), polyphenylene sulfide (PPS), polyetherimide (PEI), 6 nylon (PA6), 6-6 nylon (PA66), polycarbonate (PC) and the like. These are used alone or in combination. Moreover, you may mix | blend inorganic fillers, such as glass fiber, a glass bead, and a talc, with these resin suitably in order to improve heat resistance and dimensional stability.
The resin nut holder and the resin molded product are preferably formed by injection molding. The resin constituting the resin nut holder has compatibility or affinity with the resin constituting the resin molded product, and the surface of the resin is partially melted by the heat of the molten resin injected to mold the resin molded product. It is good to comprise with a resin. However, the melting is not essential.

  The terminal plate and the electrode plate can be manufactured by punching a copper plate, an aluminum plate or the like. At this time, the bolt insertion holes of the terminal board are formed simultaneously. Preferably, the punched flat plate is bent to form an electrode plate that is integrally extended from the terminal plate and bent so that the cross-sectional shape of the terminal plate is L-shaped. The terminal plate and the electrode plate using a copper plate are subjected to nickel plating or the like on the surface as necessary.

  Hereinafter, preferred embodiments of the present invention will be described in detail with appropriate reference to the drawings.

FIG. 1 is a perspective view for explaining the positional relationship among a nut 1, a resin nut holder 2, a terminal plate 4 and an electrode plate 5.
The nut 1 is accommodated in the recessed portion 7 provided in the resin nut holder 2 in a state where one side of the surface having the screw hole 8 can be seen outside and rotation can be prevented. The terminal plate 4 is opposed to the surface of the nut 1 viewed from the outside so that the positions of the bolt insertion holes 3 and the screw holes 3 of the nut 1 correspond to each other. As a result, the electrode plate 5 that is integrally extended from the terminal plate 4 and has a sectional shape bent in an L shape faces the outer surface of the resin nut holder 2. The resin nut holder 2 is provided with a first step portion 11 having the thickness direction of the terminal plate 4 in the depth direction at the opening portion of the recessed portion 7 for accommodating the nut 1. It fits into the part 11 and is held in contact with the bottom of the first step part 11.

It should be noted that if the dimensional relationship is such that a slight gap is formed between the nut 1 and the side wall of the recessed portion 7, the nut 1 can be removed from the gap 1 even if the bolt insertion hole 3 and the screw hole 3 of the nut 1 are not strictly aligned. Because it can be moved within the range, it is flexible in alignment.
Further, as shown in a cross-sectional view in FIG. 4, a concave portion 7 ′ having a small outer shape is continuously provided from the bottom of the concave portion 7, and the surface of the nut 1 is supported on the stepped portions of the concave portions 7 and 7 ′. it can. When the terminal plate 4 and the external electrode plate 9 in contact with the terminal plate 4 are fastened by screwing the bolt 10 and the nut 1 passing therethrough, the recessed portion 7 ′ has a receiving portion for the bolt 10 protruding from the nut 1. can do.

  FIG. 2 is a perspective view showing an assembly 12 including a nut 1, a resin nut holder 2, a terminal plate 4, and an electrode plate 5 configured by fitting and holding the terminal plate 4 on the first step portion 11. That is, it shows a state in which the members shown in FIG. 1 are combined. By configuring the assembly 12, the positional relationship between the terminal plate 4 and the electrode plate 5 extended from the terminal plate 4 and the resin nut holder 2 is regulated. The terminal plate 4 is in contact with the bottom surface of the first step portion 11, and the resin nut holder 2 and the electrode plate 5 are located at a predetermined interval, and this positional relationship is also restricted.

3 is a perspective view of a main part of a molded product obtained by insert molding the assembly 12 into the resin molded product 6. FIG. 4 is a cross-sectional view taken along the line AA 'in FIG. 3, and FIG. It is sectional drawing which follows the BB 'line.
A part of the resin nut holder 2 is embedded in the resin molded product 6.
A description will be given below, with the resin nut holder 2 holding a predetermined interval and defining the side facing the electrode plate 5 as the lower side and the extending direction of the electrode plate 5 as the rear side.
The place where the resin nut holder 2 is embedded is from the front side of the lower block to the entire rear side. The electrode plate 5 is insert-molded such that at least a portion facing the resin nut holder 2 is embedded in the resin molded product 6.

6 and 7 show a positional relationship between the molding die and the insert when the resin molded product 6 is integrally injection-molded using the assembly 12 as an insert. FIG. 6 shows before clamping and FIG. 7 shows after clamping. In FIG. 2 and FIGS. 6 and 7, the vertical positional relationship of the assembly 12 is shown inverted.
In insert molding, the surface of the terminal plate 4 is isolated from the molding cavity 17 and positioned outside the molding cavity 17, and the lower block of the resin nut holder 2 is made to face the molding cavity 17. In addition, a part of the surface area of the resin nut holder 2 is positioned in close contact with the positioning wall provided in the molding cavity and positioned in the molding cavity, and the frontmost part of the front side of the resin nut holder 2 outside the molding cavity. The mold is clamped so that is in contact with the mold surface of the molding die. By this clamping, the entire assembly 12 is positioned and fixed in cooperation with bringing a partial surface region of the resin nut holder 2 into close contact with the positioning wall provided in the molding cavity.
The molding die shown in FIGS. 6 and 7 includes a first mold member 21, a second mold member 22, and a third mold member 23. The cross-sectional shape of the molding die and the relative direction of clamping are indicated by virtual lines (dotted lines and arrows). In the illustrated example, the first mold member 21 is provided with a positioning wall. 6 and 7, the positioning wall cannot be shown because the molding die is shown in a cross-sectional view, but a partial surface region 18 shown as an aggregate of dots on the resin nut holder 2 is a first die member. 21 is in close contact with the positioning wall provided at 21.

Hereinafter, a more detailed description will be given with reference to FIGS.
The resin nut holder 2 (assembly 12) is placed on the first mold member 21, and the partial surface region 18 is brought into close contact with the positioning wall provided on the first mold member 21. The partial surface region 18 is mainly on the surface of the upper block of the resin nut holder 2, and the lower block of the resin nut holder 2 may partially include the surface of the front block. Then, as shown in FIG. 6, the second mold member 22 is lowered in the arrow direction and the third mold member 23 is slid in the arrow direction. As a result, as shown in FIG. 7, the frontmost part surface of the front side of the resin nut holder 2 comes into contact with the mold surface of the third mold member 23 to complete the mold clamping. The assembly 12 is reliably positioned and fixed by the mold clamping, and at the same time, a molding cavity 17 is constituted by the first mold member 21, the second mold member 22, and the third mold member 23. The surface of the terminal plate 4 faces a recess provided in the third mold member 23, and the frontmost part surface on the front side of the resin nut holder 2 comes into contact with the mold surface of the third mold member 23, thereby The surface of the plate 4 is isolated from the molding cavity 17.
Then, the molten resin is injected into the molding cavity 17, and the resin nut holder 2 (mainly the lower block) facing the molding cavity 17 is embedded in the resin. The electrode plate 5 has at least a portion facing the outer surface of the resin nut holder 2 embedded in the resin. As a result, the surface of the terminal plate 4 is exposed from the resin molded product 6, the resin is filled into the gap between the resin nut holder 2 and the electrode plate 5, and the electrode plate 5 is embedded in the resin. (See FIGS. 4 and 5).
The surface of the terminal plate 4 is not disposed in the molding cavity 17 of the resin molded product 6. In addition, since the front end portion surface on the front side of the resin nut holder 2 is in contact with the mold surface of the molding die, there is no concern that the surface of the terminal plate 4 is covered with the resin layer. Similarly, there is no concern that a resin layer is formed on the interface between the terminal plate 4 and the surface of the nut 1 located on the back surface thereof.

Preferably, a groove 16 reaching the outside from the inside of the molding cavity 17 is provided in a partial surface region 18 of the resin nut holder 2, and a positioning wall provided in the first mold member 21 that contacts the surface. Provide air vent function in cooperation with
When the air vent function is provided by the cooperation of the groove 16 of the resin nut holder 2 and the positioning wall of the first mold member 21, the resin that has flowed into the air vent (groove 16) is part of the resin molded product 6. It remains on the resin molded product side. Since this is taken out every time the mold is opened, vent clogging does not occur, and the maintenance frequency of the mold can be reduced.

  Examples will be specifically described below based on the above embodiment.

Example 1
The terminal plate 4 has a bent portion 13 that is integrally extended from a portion opposite to the extended portion of the electrode plate 5 and bent in the same direction as the electrode plate 5 so that the terminal plate 4 has an L-shaped cross section. And A second step portion 14 (see FIG. 1) having a thickness direction of the bent portion 13 as a depth direction is provided on the outer surface of the resin nut holder 2 to be brought into contact with the bent portion 13, and the bent portion 13 is It fits into the second step 14 and is held in contact with the bottom of the second step. The assembly 12 is thus configured, and the resin molded product 6 is molded in the same manner as in the above embodiment. In this case, similarly to the surface of the terminal plate 4, the surface of the bent portion 13 faces the concave portion provided in the first mold member 21, and the upper surface of the resin nut holder 2 is the first mold member 21. Abuts against the mold surface.
In the present embodiment, the terminal plate 4 and the electrode plate 5 and the resin nut holder 2 are held by fitting the terminal plate 4 to the first step portion 11 and holding the bent portion 13 to the second step portion 14. The positional relationship can be more reliably regulated.

Example 2
In the above example, the place where the resin nut holder 2 is embedded in the resin molded product 6 extends from the front side of the lower block to the entire rear side. In the present embodiment, a surface region that is not embedded in the resin molded product 6 is left on the front side of the lower block of the resin nut holder 2 by being brought into close contact with the positioning wall of the first mold member 21. In other words, in the front region of the lower block of the resin nut holder 2, it is embedded in the resin molded product 6 below the side wall of the recessed portion 7 (the wall surface facing the peripheral surface of the nut 1). Let it be a part.
In this embodiment, in addition to the upper block of the resin nut holder 2, the front and upper regions of the lower block of the resin nut holder 2 are regions that are not embedded in the resin molded product 6 (that is, FIG. 6 and FIG. 7 show a partial surface region 18 indicated by a set of dots. This region is a surface that is brought into close contact with the positioning wall of the first mold member 21. Since this surface does not face the molding cavity 17, it is possible to reliably prevent the molten resin from the injection molding from entering the interface between the terminal plate 4 and the surface of the nut 1 located on the back surface thereof. There is no concern that a resin layer is formed at the interface.

Example 3
Between the outer surface of the resin nut holder 2 and the electrode plate 5 opposite thereto, a rib 15 provided so as to protrude integrally from the resin nut holder 2 is disposed, and the tip of the rib 15 contacts the electrode plate 5. Assume that the assembly 12 is in contact (see FIG. 2). Using this assembly 12, the resin molded product 6 is molded in the same manner as in the above embodiment.
In this case, the molten resin injected into the molding cavity 17 is filled in the space between the outer side surface of the resin nut holder 2 and the electrode plate 5 opposite thereto, except for the portion occupied by the ribs 15. The The amount of filled resin is reduced by the volume of the rib 15. Therefore, molding defects such as sink marks, voids, and dimensional defects in this portion that tend to be thick can be suppressed. Further, at the time of injection molding, the electrode plate 2 is supported by a rib 15 whose tip is in contact with the electrode plate 2. Therefore, it is possible to suppress the electrode plate 5 from being deformed by the injection pressure of the molten resin.

Example 4
In the present embodiment, the rib 15 has a length protruding beyond the depth of the resin nut holder 2 to the rear side in the third embodiment. As a result, the contact area (length) of the electrode plate 2 and the rib 15 increases, so that deformation of the electrode plate 5 due to the injection pressure of the molten resin can be more effectively suppressed.

Example 5
In the second embodiment, a partial surface region 18 that is not embedded in the resin molded product 6 is set on the upper side of the upper block of the resin nut holder 2 and the front side and the upper side of the lower block of the resin nut holder 2. ing. The region of the resin nut holder 2 is a surface to be brought into close contact with the positioning wall of the first mold member 21, but in this embodiment, the groove 16 is provided in the region, and the positioning wall of the first mold member 21 and The air vent function is given by cooperation. The groove 16 is provided not on the inner wall surface side of the molding cavity but on the surface of the resin nut holder 2 side. When the resin nut holder 2 is placed in the molding cavity 17 and clamped, the groove 16 becomes an air vent that communicates from the molding cavity 17 to the outside.
When the molten resin is injected into the molding cavity 17 and the resin molded product 6 is molded, a small amount of the molten resin flows into the groove 16 and is solidified. When the molding die is opened, this resin remains as a part of the molded product on the resin molded product 6 side. Since it is taken out every time the mold is opened, vent clogging does not occur, and the maintenance frequency of the mold can be reduced.

DESCRIPTION OF SYMBOLS 1 Nut 2 Resin nut holder 3 Bolt insertion hole 4 Terminal board 5 Electrode board 6 Resin molded product 7, 7 'Recessed part 8 Screw hole 9 External electrode board 10 Bolt 11 1st step part 12 Assembly 13 Bending part 14 2nd Step portion 15 Rib 16 Groove 17 Molding cavity 18 Partial surface region 21 First mold member 22 Second mold member 23 Third mold member

Claims (12)

A resin nut holder that accommodates a nut, a terminal plate provided with a bolt insertion hole, and an electrode plate that is integrally extended from the terminal plate and bent so that the terminal plate has an L-shaped cross section. And
The nut is housed in a recess provided in the resin nut holder in a state where one side of a surface having a screw hole can be seen outside and can be prevented from rotating.
The terminal plate is opposed to the surface of the nut looked outside so that the bolt insertion hole and the screw hole of the nut correspond to each other, and the electrode plate is opposed to the outer surface of the resin nut holder. And
In the resin molded product in which the terminal plate is exposed on the surface, and the resin nut holder and the electrode plate are insert-molded while maintaining a predetermined interval,
The terminal board is fitted and held in a resin nut holder,
The resin nut holder holds a predetermined interval and the side facing the electrode plate is the lower side, and the direction in which the electrode plate is extended is the rear side, and the lower block of the resin nut holder is the front side Embedded in the resin molded product over the entire rear side from
A resin molded product, wherein the electrode plate is insert-molded so that at least a portion facing the resin nut holder is embedded in the resin molded product.   The resin nut holder is provided with a first step portion whose depth direction is the thickness direction of the terminal plate at the opening portion of the recessed portion for accommodating the nut, and the terminal plate is fitted into the first step portion and is first fitted. The resin molded product according to claim 1, wherein the resin molded product is held in contact with the bottom of the stepped portion.   The terminal plate has a bent portion that is integrally extended from a portion opposite to the electrode plate extending portion and bent in the same direction as the electrode plate so that the cross-sectional shape of the terminal plate is L-shaped. A second step portion having a depth direction in the thickness direction of the bent portion is provided on the outer side surface of the resin nut holder in contact, and the bent portion is fitted to the second step portion and brought into contact with the bottom portion of the second step portion. The resin molded product according to claim 1, wherein the resin molded product is held by the resin.   The resin molded product according to any one of claims 1 to 3, wherein the resin nut holder leaves a region that is not embedded in the resin molded product on the front side and the upper side of the lower block.   Between the outer surface of the resin nut holder and the electrode plate facing it, a rib is provided that protrudes integrally from the resin nut holder, and the tip of the rib is brought into contact with the electrode plate to perform insert molding. The resin molded product according to claim 4, wherein   The rib is provided with a length that protrudes from the main body of the resin nut holder to the rear side, with the extending direction of the electrode plate having a cross-sectional shape extending in an L shape extending from the terminal plate as the rear side. 5. The resin molded product according to 5. A nut, a resin nut holder that accommodates the nut, a terminal plate provided with a bolt insertion hole, and an electrode that is integrally extended from the terminal plate and bent so that the cross-sectional shape of the terminal plate is L-shaped Prepare the board and
A first step of accommodating the nut in a recessed portion provided in a resin nut holder so that one side of the surface having the screw hole of the nut can be seen outside and rotation of the nut can be prevented; The positional relationship between the terminal plate and the electrode plate and the resin nut holder so that the bolt insertion hole and the screw hole of the nut correspond to each other and the electrode plate faces the outer surface of the resin nut holder. And a second step of positioning and clamping the resin nut holder and the electrode plate in a molding cavity of a molding die for molding a resin molded product so that the terminal plate is exposed on the surface. And a fourth step of injecting molten resin into the molding cavity and insert-molding the resin nut holder and the electrode plate while maintaining a predetermined distance therebetween. In Stomach,
In the second step, the terminal plate is fitted and held in a resin nut holder, and a nut, a resin nut holder, a terminal plate, and a nut that define the positional relationship between the terminal plate and the electrode plate and the resin nut holder, A step of constructing an assembly of electrode plates,
In the third step, the surface of the terminal plate is formed as a molding cavity, with the resin nut holder maintaining a predetermined interval and the side facing the electrode plate as the lower side and the extending direction of the electrode plate as the rear side. The resin nut holder is positioned away from the molding cavity, the lower block of the resin nut holder faces the molding cavity, and a partial surface region of the resin nut holder is brought into close contact with the positioning wall provided in the molding cavity. It is a step of clamping the mold so that the foremost part surface on the front side of the resin nut holder is in contact with the mold surface of the molding die, while positioning the molding cavity.
The fourth step is a step of embedding the block facing the molding cavity of the resin nut holder and at least the portion of the electrode plate facing the outer surface of the resin nut holder in the resin. Manufacturing method of resin molded products. The resin nut holder, the recess opening portion for accommodating a nut, is provided with a first step portion according to the depth direction of the thickness direction of the terminal board, in a second step, the terminal plate the first 8. The method of manufacturing a resin molded product according to claim 7, wherein the assembly is configured by being fitted to the stepped portion and held in contact with the bottom of the first stepped portion. The terminal plate has a bent portion that is integrally extended from a portion opposite to the electrode plate extending portion and bent in the same direction as the electrode plate so that the cross-sectional shape of the terminal plate is L-shaped. the outer surface of the resin nut holder in contact, is provided with a second step for the thickness direction of the bent portion and the depth direction, in a second step, a bent portion that holds together fitted in the second step 9. The method for producing a resin molded product according to claim 7 or 8, wherein the assembly is constituted by:
  In the third step, the molding cavity is formed so that the resin nut holder is left on the upper side of the lower block and on the front side, on the front side following the frontmost part, and in close contact with the positioning wall provided in the molding cavity. The resin molded product according to claim 7, wherein the resin molded product is a step of positioning and clamping.   An assembly in which a rib provided so as to protrude integrally from the resin nut holder is disposed between the outer surface of the resin nut holder and the electrode plate opposed thereto, and the tip of the rib is in contact with the electrode plate The method for producing a resin molded product according to any one of claims 7 to 9, wherein the molding is performed by insert molding.   Insert-molding an assembly in which the ribs are provided with a length that protrudes from the main body of the resin nut holder to the rear side, with the extending direction of the electrode plate whose cross-sectional shape extending from the terminal plate extending in an L shape as the rear side The method for producing a resin molded product according to claim 11.

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