JP2021037634A - Method for manufacturing resin molding, and molding die of resin molding - Google Patents

Abstract

To provide a method for manufacturing a resin molding which enables insert molding of a secondary molding while suppressing positional deviation of a primary molding.SOLUTION: A primary molding 10 has a first side face 15 for be exposed to an outer surface of a resin molding 1, and a second side face 16 having an intersection angle θ to the first side face 15 of larger than 90 degrees. A method for manufacturing a resin molding includes: a step of storing the primary molding 10 in a cavity of the molding die in a state where the first side face 15 and the second side face 16 are each abutted to a first cavity surface 34 and a second cavity surface 35 of the molding die 30; and a step of injecting a resin into the cavity and molding a secondary molding 20, and molding a resin molding 1 in which the primary molding 10 is insert-molded to the secondary molding 20.SELECTED DRAWING: Figure 6

Description

The present invention relates to a method for producing a resin molded product and a molding mold for the resin molded product.

Conventionally, a manufacturing method for manufacturing a resin molded body by a method such as injection molding using a predetermined mold has been known. For example, in one of the conventional manufacturing methods, a preformed body is placed at a predetermined position in a cavity of a mold, and then a resin is injected into the cavity to insert-mold the preformed body into a final molded product. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-018633

In the conventional manufacturing method described above, the preformed body is placed at a predetermined position in the cavity by locking the preformed body to a predetermined convex portion or concave portion provided on the inner side surface of the mold that defines the cavity. It is designed to do. However, for example, depending on the posture of the preformed body in the cavity and the locking strength, the preformed body is in an inclined state although it is in contact with the convex portion or the concave portion, and is displaced from the original design position ( It is considered that there is a possibility of misalignment). From the viewpoint of improving quality such as dimensional accuracy of the resin molded product, it is desirable to suppress such positional deviation as much as possible.

This was done in view of the above circumstances, and the purpose is a method for producing a resin molded body capable of insert molding a secondary molded body while suppressing a displacement of the primary molded body, and molding of the resin molded body. The type is to provide.

In order to achieve the above-mentioned object, the method for producing a resin molded product and the molding mold according to the present invention are characterized by the following [1] to [3].
[1]
It is a manufacturing method of a resin molded body for manufacturing a resin molded body in which a primary molded body is insert-molded into a secondary molded body.
The primary molded body is
It has a first side surface that is exposed to the outer surface of the resin molded body, and a second side surface that has an intersection angle with respect to the first side surface of more than 90 degrees.
The manufacturing method is
A step of accommodating the primary molded product in the cavity of the molding die in a state where the first side surface and the second side surface are in contact with the first cavity surface and the second cavity surface of the molding die, respectively.
A step of injecting a resin into the cavity to form the secondary molded body and molding the resin molded body in which the primary molded body is insert-molded into the secondary molded body is provided.
It must be a method for manufacturing a resin molded product.
[2]
In the manufacturing method described in [1] above,
The molding mold is
An injection hole for injecting the resin into the cavity is provided at a position where the primary molded body is to be accommodated between the first cavity surface and the second cavity surface and the injection hole.
It must be a method for manufacturing a resin molded product.
[3]
A mold for producing a resin molded body in which the primary molded body is insert-molded into a secondary molded body.
The primary molded body is
It has a first side surface that is exposed to the outer surface of the resin molded body, and a second side surface that has an intersection angle with respect to the first side surface of more than 90 degrees.
The molding mold is
It has a first cavity surface that can abut the first side surface and a second cavity surface that can abut the second side surface, and the first cavity surface and the first cavity surface and the second side surface are covered with the first side surface and the second side surface. It is configured to define a cavity capable of accommodating the primary molded body in a state where the second cavity surfaces are in contact with each other.
Must be a molding mold for a resin molded product.

According to the method for manufacturing a resin molded product having the configuration of [1] above, the primary side surface and the second side surface of the primary molded product are in contact with the first cavity surface and the second cavity surface of the molding mold, respectively. The molded body is placed in the molding die. Since the first side surface and the second side surface have a positional relationship of forming an intersection angle (that is, an obtuse angle) larger than 90 degrees, when the primary molded body is placed in the molding die, the first side surface is from the first cavity surface. When trying to tilt away, the second side surface is pressed against the second cavity surface, so that such tilting is suppressed. On the contrary, when the second side surface is inclined so as to be separated from the second cavity surface, the first side surface is pressed against the first cavity surface, so that such inclination is suppressed. Therefore, as compared with the case where the crossing angle is 90 degrees or less (for example, a right angle), it is possible to suppress the displacement (positional deviation) of the primary molded body due to the weight of the primary molded body or vibration from the outside. Therefore, as compared with the conventional manufacturing method, the manufacturing method of this configuration enables insert molding of the secondary molded body while suppressing the positional deviation of the primary molded body.

According to the method for manufacturing a resin molded product having the configuration of [2] above, when the resin is injected into the cavity of the molding mold, the primary molded product is pressed against the first cavity surface and the second cavity surface by the injection pressure of the resin. It will be. As described above, the displacement of the primary molded body is suppressed by the contact between the first side surface and the second side surface of the primary molded body and the first cavity surface and the second cavity surface of the molding die. As a result, the displacement of the primary molded body due to the injection pressure of the resin is suppressed. Therefore, the positional deviation of the primary molded body can be suppressed more appropriately.

According to the molding die of the resin molded body having the configuration of [3] above, the primary side surface and the second side surface of the primary molded body are in contact with the first cavity surface and the second cavity surface of the molding die, respectively. The molded body is placed in the molding die. Since the first side surface and the second side surface have a positional relationship of forming an intersection angle (that is, an obtuse angle) larger than 90 degrees, when the primary molded body is placed in the molding die, the first side surface is from the first cavity surface. When trying to tilt away, the second side surface is pressed against the second cavity surface, so that such tilting is suppressed. On the contrary, when the second side surface is inclined so as to be separated from the second cavity surface, the first side surface is pressed against the first cavity surface, so that such inclination is suppressed. Therefore, as compared with the case where the crossing angle is 90 degrees or less (for example, a right angle), it is possible to suppress the displacement (positional deviation) of the primary molded body due to the weight of the primary molded body or vibration from the outside. Therefore, as compared with the conventional manufacturing method, the molding die having this configuration can insert-mold the secondary molded body while suppressing the positional deviation of the primary molded body.

As described above, according to the present invention, it is possible to provide a method for producing a resin molded body capable of insert molding a secondary molded body while suppressing a displacement of the primary molded body, and a molding die for the resin molded body.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a resin molded product manufactured by the manufacturing method according to the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a schematic cross-sectional view showing how the primary molded body is housed in the molding die used for manufacturing the resin molded body. FIG. 4 is a schematic cross-sectional view showing how the slide core is assembled between the upper mold and the lower mold accommodating the primary molded body. FIG. 5 is a schematic cross-sectional view showing how the primary molded body is housed in the molding die. FIG. 6 is a schematic cross-sectional view showing how the resin is injected into the molding die through the gate hole provided in the upper die. FIG. 7 is a schematic cross-sectional view showing how the molded resin molded body is taken out from the molding die.

<Embodiment>
Hereinafter, the manufacturing method according to the embodiment of the present invention for manufacturing the resin molded product 1 will be described with reference to the drawings. Hereinafter, for convenience of explanation, the side (left side in FIGS. 1 to 7) in which the mating terminal (not shown) is fitted to the hood portions 22 and 23 of the resin molded body 1 is the front side, and the opposite side (FIGS. 1 to 1). The right side in FIG. 7) is referred to as the rear side. Further, in FIGS. 1 to 7, the upper side and the lower side are referred to as an upper side and a lower side, respectively.

As shown in FIGS. 1, 2 and 7, the resin molded body 1 is configured such that the primary molded body 10 is insert-molded into the secondary molded body 20. In particular, as shown in FIG. 1, in this example, the two primary molded bodies 10 are insert-molded into the secondary molded body 20 in a state where they are arranged side by side at positions corresponding to the hood portions 22 and 23 described later. ..

The primary molded body 10 is a resin molded body provided with a resin portion 12 so as to cover and hold the periphery of a plurality of terminal fittings 11 arranged so as to be arranged in a predetermined arrangement. The primary molded body 10 can be manufactured, for example, by injection molding using a plurality of molds (not shown). One end 11a of the terminal fitting 11 projects downward from the rear end 13 of the resin portion 12, and is arranged so that the lower end positions of the terminal fittings 11 are aligned with each other. The other end 11b of the terminal fitting 11 projects forward from the front end portion 14 of the resin portion 12, and is arranged so that the positions of the front ends thereof are aligned. The inner side surface 15 located on the lower side of the rear end portion 13 and the inner side surface 16 located on the rear side of the front end portion 14 that define the internal space of the resin molded body 1 have an angle of intersection θ with each other. It is arranged so that it is 90 degrees or more. The rear end portion 13 of the resin portion 12 is provided with a recess 17 into which the regulation protrusion 32b of the lower mold 32, which will be described later, is inserted.

The secondary molded body 20 has a substantially rectangular case body 21 and a pair of hood portions 22 and 23 that open from the front surface of the case body 21 toward the front. The hoods 22 and 23 define a fitting port for receiving a mating connector (not shown). The case body 21 is open downward, and a cover (not shown) is assembled so as to cover the circuit board or the like in a state where the circuit board or the like (not shown) is incorporated inside the case body 21. It has become like. A locking portion 24 for locking a locking projection (not shown) provided on the cover is provided on the outer peripheral surface of the case body 21.

In particular, as shown in FIG. 2, the inner side surface 16 of the resin portion 12 that defines the internal space of the resin molded body 1 is flush with the inner side surface 25 on the rear side of the hood portion 23 of the secondary molded body 20. It is arranged so as to be. That is, the surface formed by connecting the inner side surface 16 of the resin portion 12 and the inner side surface 25 of the secondary molded body 20 is inclined in the vertical direction by an angle corresponding to the above-mentioned intersection angle θ. .. As a result, for example, when the inner side surface 16 of the resin portion 12 and the inner side surface 25 of the secondary molded body 20 are displaced from each other and are not arranged in a sufficiently flush state, such a position is visually observed. It becomes easier to check the deviation.

As shown in FIG. 6, the resin molded body 1 in which the primary molded body 10 is insert-molded into the secondary molded body 20 accommodates the primary molded body 10 in a molding die 30 described later, and forms the primary molded body 10 and the molding die. It is formed by injecting resin into the molding space S defined between the cavity surface of 30 and forming the secondary molded body 20.

As shown in FIGS. 3 to 7, the molding die 30 includes an upper die 31, a lower die 32, and a slide core 33. The upper die 31 and the lower die 32 have a die cutting direction set in the vertical direction, and each has a cavity surface for molding the upper and lower surfaces of the resin molded body 1. The upper mold 31 is provided with a gate hole 31a for injecting the resin R into the molding mold 30. The cavity surface 34 of the lower mold 32 is provided with a set hole 32a into which one end 11a of the terminal fitting 11 can be inserted. The set hole 32a has a shape substantially matching the cross-sectional shape of one end 11a of the terminal fitting 11. By performing insert molding with one end 11a of the terminal fitting 11 inserted into the set hole 32a, the portion of one end 11a of the terminal fitting 11 that has been inserted into the set hole 32a is the rear end portion of the resin molded body 1. It will protrude from the surface of 13. The cavity surface 34 is provided with a regulation protrusion 32b that projects upward.

In the lower mold 32, the crossing angle with respect to the cavity surface 34 is an angle corresponding to the crossing angle θ between the inner side surface 15 of the rear end portion 13 of the resin portion 12 and the inner side surface 16 of the front end portion 14. Is provided. The cavity surface 35 faces the front side. Further, the lower mold 32 is provided with a recess 36 for molding a portion corresponding to the inner side surface 25 of the secondary molded body 20. As will be described later, the recess 36 defines a part of the molding space S when the molding die 30 is closed.

The slide core 33 is movable in the front-rear direction (direction orthogonal to the die-cutting direction of the upper die 31 and the lower die 32), and is a cavity for forming the inner peripheral surfaces of the hood portions 22 and 23 of the secondary molded body 20. Has a face. The tip surface 33a of the slide core 33 is provided with a set hole 33b for accommodating the other end 11b of the terminal fitting 11.

Hereinafter, a procedure for molding the resin molded body 1 using the molding die 30 will be described. First, as shown in FIG. 3, while inserting one end 11a of the terminal fitting 11 of the primary molded body 10 into the set hole 32a, the inner side surface 15 of the primary molded body 10 comes into contact with the cavity surface 34, and the inner side surface 16 is the cavity. The primary molded body 10 is arranged on the lower mold 32 so as to be in contact with the surface 35. At this time, by inserting the regulating protrusion 32b of the lower mold 32 into the recess 17 of the primary molded body 10, the position of the primary molded body 10 in the front-rear direction is regulated. Further, when the inner side surface 15 tries to tilt away from the cavity surface 34, the inner side surface 16 is pressed against the cavity surface 35, so that such inclination is suppressed. The reverse inclination is similarly suppressed.

Next, after assembling the upper mold 31 to the lower mold 32, the slide core 33 is moved toward the front end portion 14 of the primary molded body 10 as shown in FIG. Specifically, while inserting the other end 11b of the terminal fitting 11 into the set hole 33b, the slide core 33 is moved until the tip surface 33a of the slide core 33 comes into contact with the front end portion 14 of the primary molded body 10.

Through the above steps, the primary molded body 10 is immovably positioned in the vertical direction and the width direction, and the mold closing by the upper mold 31, the lower mold 32, and the slide core 33 is completed. As shown in FIG. 5, in this mold closed state, a molding space S is formed by the cavity surface of the upper mold 31, the cavity surface of the lower mold 32, the cavity surface of the slide core 33, and the outer surface of the primary molded body 10. ing. The recess 36 described above defines a part of the molding space S.

Then, as shown in FIG. 6, by injecting the resin R into the molding space S through the gate hole 31a of the upper mold 31, the secondary molded body 20 is molded so as to cover the outer surface of the primary molded body 10. At this time, due to the injection pressure of the resin R injected from the gate hole 31a, the primary molded body 10 receives an external force downward and is pressed toward the lower mold 32. Then, the inner side surface 15 is pressed against the cavity surface 34, and the inner side surface 16 is pressed against the cavity surface 35. At this time, since the inner side surfaces 15 and 16 have the above-mentioned crossing angle θ and are in close contact with the cavity surfaces 34 and 35, displacement such as tilting of the primary molded body 10 due to such an external force is suppressed. ..

After the elapse of the predetermined cooling period, as shown in FIG. 7, the mold is opened, and the resin molded body 1 in which the primary molded body 10 is insert-molded into the secondary molded body 20 is taken out from the molding die 30.

As described above, according to the manufacturing method according to the embodiment of the present invention used when manufacturing the resin molded body 1, the inner side surface 15 and the inner side surface 16 of the primary molded body 10 are the first cavity surface 34 and the first cavity surface 34 of the molding die 30. The primary molded body 10 is arranged in the molding die 30 in a state of being in contact with each of the two cavity surfaces 35. Since the inner side surface 15 and the inner side surface 16 have a positional relationship of forming an intersection angle θ (that is, an obtuse angle) larger than 90 degrees, when the primary molded body is arranged in the molding die 30, the inner side surface 15 is the first cavity. When an attempt is made to incline away from the surface 34, the inner surface 16 is pressed against the second cavity surface 35, so that such inclination is suppressed. On the contrary, when the inner side surface 16 tries to tilt away from the second cavity surface 35, the inner side surface 15 is pressed against the first cavity surface 34, so that such tilting is suppressed. Therefore, as compared with the case where the crossing angle θ is 90 degrees or less (for example, a right angle), it is possible to suppress the displacement (positional deviation) of the primary molded body 10 due to the weight of the primary molded body 10 or vibration from the outside. Therefore, as compared with the conventional manufacturing method, the manufacturing method of this configuration enables insert molding of the secondary molded body 20 while suppressing the positional deviation of the primary molded body 10.

Further, when the resin is injected into the cavity of the molding die 30, the injection pressure of the resin R causes the primary molded body 10 to be pressed against the first cavity surface 34 and the second cavity surface 35. As described above, the displacement of the primary molded body 10 is suppressed by the contact between the inner side surface 15 and the inner side surface 16 of the primary molded body 10 and the first cavity surface 34 and the second cavity surface 35 of the molding die 30. ing. As a result, the displacement of the primary molded body 10 due to the injection pressure of the resin R is suppressed. Therefore, the positional deviation of the primary molded body 10 can be suppressed more appropriately.

The present invention is not limited to the above-described embodiment, and can be appropriately modified, improved, and the like. In addition, the material, shape, size, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

Here, the features of the above-mentioned manufacturing method according to the present invention and the embodiment of the molding mold are briefly summarized and listed below in [1] to [3], respectively.
[1]
A method for producing a resin molded product (1) for producing a resin molded product (1) in which a primary molded product (10) is insert-molded into a secondary molded product (20).
The primary molded body (10) is
A first side surface (15) that is exposed to the outer surface of the resin molded body (1) and a second side surface (16) whose intersection angle (θ) with respect to the first side surface (15) is larger than 90 degrees. Have,
The manufacturing method is
The primary molding is performed in a state where the first side surface (15) and the second side surface (16) are in contact with the first cavity surface (34) and the second cavity surface (35) of the molding die (30), respectively. The step of accommodating the body (10) in the cavity of the molding mold, and
The resin molded body (1) in which a resin is injected into the cavity to form the secondary molded body (20) and the primary molded body (10) is insert-molded into the secondary molded body (20). With the process of molding,
A method for producing a resin molded product (1).
[2]
In the manufacturing method described in [1] above,
The molding mold (30) is
An injection hole (31a) for injecting the resin into the cavity is provided between the first cavity surface (34) and the second cavity surface (35) and the injection hole (31a). Hold in a position where (10) will be accommodated.
A method for producing a resin molded product (1).
[3]
The primary molded body (10) is a molding die of the resin molded body (1) for producing the resin molded body (1) which is insert-molded into the secondary molded body (20).
The primary molded body (10) is
A first side surface (15) that is exposed to the outer surface of the resin molded body (1) and a second side surface (16) whose intersection angle (θ) with respect to the first side surface (15) is larger than 90 degrees. Have,
The molding mold is
It has a first cavity surface (34) that can abut the first side surface (15) and a second cavity surface (35) that can abut the second side surface (16), and the first side surface. A cavity capable of accommodating the primary molded body (10) in a state where the first cavity surface (34) and the second cavity surface (35) are in contact with (15) and the second side surface (16), respectively. Is structured to define
Mold of resin molded body (1).

1 Resin molded body 10 Primary molded body 15 First side surface 16 Second side surface 20 Secondary molded body 30 Molding mold 31a Gate hole (injection hole)
34 1st cavity surface 35 2nd cavity surface

Claims (3)

It is a manufacturing method of a resin molded body for manufacturing a resin molded body in which a primary molded body is insert-molded into a secondary molded body.
The primary molded body is
It has a first side surface that is exposed to the outer surface of the resin molded body, and a second side surface that has an intersection angle with respect to the first side surface of more than 90 degrees.
The manufacturing method is
A step of accommodating the primary molded product in the cavity of the molding die in a state where the first side surface and the second side surface are in contact with the first cavity surface and the second cavity surface of the molding die, respectively.
A step of injecting a resin into the cavity to form the secondary molded body and molding the resin molded body in which the primary molded body is insert-molded into the secondary molded body is provided.
A method for manufacturing a resin molded product. In the manufacturing method according to claim 1,
The molding mold is
An injection hole for injecting the resin into the cavity is provided at a position where the primary molded body is to be accommodated between the first cavity surface and the second cavity surface and the injection hole.
A method for manufacturing a resin molded product. A mold for producing a resin molded body in which the primary molded body is insert-molded into a secondary molded body.
The primary molded body is
It has a first side surface that is exposed to the outer surface of the resin molded body, and a second side surface that has an intersection angle with respect to the first side surface of more than 90 degrees.
The molding mold is
It has a first cavity surface that can abut the first side surface and a second cavity surface that can abut the second side surface, and the first cavity surface and the first cavity surface and the second side surface are covered with the first side surface and the second side surface. It is configured to define a cavity capable of accommodating the primary molded body in a state where the second cavity surfaces are in contact with each other.
Molding mold for resin molded products.

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