JPH10119092A - Mold for insert molding and insert molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for insert molding to shorten a molding time with a low cost by eliminating deviation of a position of an insert component, freely setting a position of a gate port and reducing a resin molding and a method for insert molding. SOLUTION: The mold 9 for insert molding manufactures a resin molding 1 by disposing an insert component 5 at a predetermined position in a cavity 31 and injecting resin in a resin injection space 18. The mold 9 comprises five lower holding pins 15 provided in a lower mold 13 in which predetermined positions of the components 5 disposed in the space 18 are held at an interval from each other, and five upper holding pins 21 provided in an upper mold 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert molding die and an insert molding method, and more particularly, to deformation and displacement of an insert part caused by a resin injected at a high pressure and at a high speed, and a mold for an insert molding die. The present invention relates to an insert molding die and an insert molding method for preventing displacement of an insert component due to a closing operation or the like.

[0002]

2. Description of the Related Art Insert parts are arranged at predetermined positions in a cavity of an insert molding die, and a portion of the insert part exposed from a resin portion is held by a holding mechanism provided in the insert molding die. . After arranging the insert part, the resin is injected into a resin injection space into which the resin in the cavity is injected, and a part of the insert part is buried in the resin part to produce a resin molded product. Since the resin is injected at a high pressure of 500 to 700 kg / cm ^{2 and at} a high speed, a considerable load is applied to a portion of the insert part located in the resin injection space.

[0003]

As described above, the insert part only holds the part exposed from the resin part, and the part located in the resin injection space of the insert part has no holding means. Not provided. Therefore, when the resin is injected at a high pressure and at a high speed and a load is applied to a portion of the insert component located in the resin injection space, the insert component is often deformed or shifted from a predetermined position. In addition, when the insert molding die moves or vibrates, such as a mold closing operation, the insert component may be displaced from a predetermined position. When the deformation or displacement of the insert part is large, a part which must be embedded in the resin part of the insert part is exposed to the outside of the resin part as shown in FIG.

[0004] The gate port is also arranged at a position where the load of the resin applied to the insert component is reduced. However, when the position of the gate port is such that the cavity cannot be efficiently filled with the resin. There is.

In order to prevent the portion of the insert part that must be embedded in the resin part from being exposed from the resin, the size of the resin part must be reduced to some extent in consideration of the deformation and displacement of the insert part in advance. It must be set with some margin. For this reason, it has been difficult to reduce the size of the resin molded product to reduce the cost and the molding time.

The present invention has been made in view of the above-mentioned conventional problems. Even if the resin is injected at a high pressure and at a high speed, the insert parts are not deformed or displaced. When the mold for insert molding moves or vibrates, such as closing operation, the position of the insert part does not shift, the position of the gate port can be set freely, and the size of the resin molded product is small. It is an object of the present invention to provide an insert molding die and an insert molding method which can reduce the cost and the molding time by the formation of the mold.

[0007]

According to a first aspect of the present invention, there is provided a resin molded product in which an insert part is disposed at a predetermined position in a cavity and a resin is injected into a resin injection space into which the resin in the cavity is injected. An insert-molding die used for manufacturing the above-mentioned is characterized by comprising an insert-part holding means for holding a predetermined position of the insert part located in the resin injection space.

According to a second aspect of the present invention, in the insert molding die of the first aspect, the insert component holding means is a set of a pair of holding members for holding the insert component, and the plurality of the pair of holding members are plural. A mold for insert molding, wherein the molds are arranged so as to be spaced from each other.

According to a third aspect of the present invention, there is provided an insert component disposing step for disposing an insert component at a predetermined position in a cavity of an insert molding die, a mold closing step for closing the insert molding die, and A resin injection step of holding a predetermined position of the insert component located in a resin injection space into which resin is injected, and a resin injection step of injecting a resin into the resin injection space to form a resin portion. Insert molding method.

[0010] According to a fourth aspect of the present invention, there is provided an insert component disposing an insert component having a hole positioned in a resin injection space into which a resin in a cavity of an insert molding die is injected, at a predetermined position in the cavity. Step, a mold closing step of closing the insert molding die, and a holding member having a fitting protrusion is brought into contact with one surface of an insert component arranged in the resin injection space, and the fitting protrusion is An insert that penetrates the hole and has a fitting hole and abuts against the other surface of the insert component disposed in the resin injection space, and is fitted into the fitting projection to hold the insert component. A resin holding step; and a resin injection step of injecting a resin into the resin injection space to form a resin portion. It is over door molding method.

According to a fifth aspect of the present invention, there is provided the insert part having a projection portion projecting from at least one surface of a portion located in a resin injection space into which a resin in a cavity of the insert molding die is injected. An insert component disposing step of disposing the insert part at a predetermined position in the cavity, a mold closing step of closing the insert molding die, and a pair of holding members having a protrusion fitting hole on at least one side are disposed in the resin injection space. An insert component holding step of holding the insert component by fitting the protruding portion into the protruding portion fitting hole while bringing the protruding portion into contact with the one side surface and the other side surface of the insert component. And a resin injection step of injecting a resin to form a resin portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a resin molded product, which is manufactured by an insert molding method using an insert molding die 9 according to an embodiment of the present invention. You. Reference numeral 3 denotes a resin portion, and the resin portion 3 has an opening 4 formed therein. Reference numeral 5 denotes a metal insert part. The buried part 10 of the insert part 5 is buried in the resin part 3, and an exposed central part 6 and two exposed ends 8 are exposed from the opening 4. Also,
In the buried portion 10, five small holes 25 are formed at intervals. Five holes 7 are formed in the main body 3, and the positions of the five holes 7 correspond to the positions of the five small holes 25.

The construction of the insert molding die 9 according to an embodiment corresponding to claims 1 and 2 will be described.
As shown in FIG. 2, the insert molding die 9 is an upper die 1.
1 and a lower mold 13, and the upper mold 11 operates in the vertical direction to open and close the insert molding die 9. Lower mold 13
Will be described. As shown in FIG.
A concave portion 16 is formed at the center, and a convex portion 20 is formed substantially at the center of the concave portion 16. The insert part accommodating part 12 is formed in the convex part 20. The insert component housing portion 12 has a shape in which the exposed central portion 6 and the two exposed end portions 8 of the insert component 5 are stored.

The recess 16 is provided with five lower holding pins 15 as holding members. This lower holding pin 15
Is composed of a pin body 17 and a fitting projection 19 formed on the upper surface of the pin body 17. The five lower retaining pins 15 are provided with five small holes 25 of the insert part 5.
Are arranged correspondingly.

The configuration of the upper mold 11 will be described. Upper mold 1
1 has a recess 14 formed therein.
Corresponding to the concave portion 16. A convex portion (not shown) is formed substantially at the center of the concave portion 14, and the convex portion is a convex portion 20 of the lower mold 13.
It corresponds to. The upper die 11 is provided with five upper holding pins 21 as holding members. The five upper holding pins 21 are provided at positions respectively corresponding to the five lower holding pins 15. Upper holding pin 21
Is formed with a fitting hole 23 in the lower surface thereof. The fitting hole 23 is provided with the fitting projection 19 of the lower holding pin 15.
Is a shape that can be fitted. A gate 33 extending in the vertical direction is formed in the upper mold 11, and a gate port 35 faces the concave portion 14.

As shown in detail in FIG. 5, when the mold 9 is closed, a cavity 31 is formed by the recess 14 of the upper mold 11 and the recess 16 of the lower mold 13. Also, cavity 3
Reference numeral 1 denotes a resin injection space 18 and an insert component housing 12. The lower holding pin 15 and the upper holding pin 21 are located in the resin injection space 18, and the fitting projection 19 of the lower holding pin 15 fits into the fitting hole 23 of the upper holding pin 21.

An insert molding method according to an embodiment corresponding to claims 3 and 4 will be described. The insert component placement step will be described. 2, 3 and 4
As shown in (1), the exposed central part 6 and the two exposed ends 8 of the insert part 5 are accommodated in the insert part accommodating part 12 of the lower mold 13, and the insert part 5 is arranged at a predetermined position of the lower mold 13. A part of the insert component holding process is performed simultaneously with the insert component placement process. That is, the five small holes 25 of the insert part 5
And the upper part of the fitting projection 19 protrudes upward from the insert component 5, and the main body 17 of the lower holding pin 15 is provided on the lower surface side of the insert component 5.
Abut on the upper surface.

The mold closing step will be described. The upper mold 11 is lowered, and the upper mold 11 is brought into contact with the lower mold 13 to close the mold. Since the fitting projection 19 of the lower holding pin 15 penetrates the small hole 25 of the insert component 5 and the upper surface of the main body 17 of the lower holding pin 15 is in contact with the lower surface side of the insert component 5, the lower portion is closed during the mold closing step. Even if the mold 13 vibrates, it is possible to prevent the insert part 13 from shifting from a predetermined position. As shown in FIGS. 5 and 6, a part of the insert component holding step is performed simultaneously with the mold closing step. That is, the lower surface of the upper holding pin 21 abuts on the upper surface side of the insert component 5, and the upper holding pin 2
The one fitting hole 23 is fitted, and the insert component 5 is held by the upper holding pin 21 and the lower holding pin 15.

The resin injection step will be described. As shown in FIG. 6, the resin passes through the gate 33 of the upper mold 11 and is injected from the gate port 35 into the resin injection space 18 to form the resin portion 3. The buried portion 10 of the insert part 5 is located in the resin injection space 18, and a load is applied to the buried portion 10 by the resin injected at a high pressure and at a high speed. However, since the buried portion 10 is held by the lower holding pin 15 and the upper holding pin 21, deformation and displacement of the insert component 5 can be prevented.

The configuration of the insert molding die 9 used in the insert molding method according to an embodiment corresponding to claim 5 will be described. This insert molding die 9 is different from the insert molding die 9 according to the first and second embodiments in the configuration of the lower holding pin 41 and the upper holding pin 45 as holding members. Therefore, the description of the other components is omitted. Projection fitting holes 47 are formed on the upper surface of the lower holding pin 41 and the lower surface of the upper holding pin 45, respectively.

An insert molding method according to an embodiment corresponding to claim 5 will be described. As shown in FIGS. 8 and 9, a projecting member 49 formed of resin is formed on the insert component 5. This projecting member 49
Is formed by insert molding, and an upper protruding portion 50 and a lower protruding portion 52 as protruding portions are connected by a connecting portion 54. The upper protruding portion 50 protrudes from the upper surface of the insert component 5, and the lower protruding portion 52 protrudes from the lower surface of the insert component 5. Further, the connecting portion 54 penetrates the small hole 25 of the insert component 5.

The insert part placing step and the mold closing step are performed in the same manner as in the insert molding method according to the third and fourth embodiments. A part of the insert component holding process is performed simultaneously with the insert component placement process. That is, the lower surface of the insert part 5 is
5, and the five lower protruding portions 52 of the protruding member 49 are fitted into the protruding portion fitting holes 43 of the five lower holding pins 41, respectively. Further, a part of the insert component holding step is performed simultaneously with the mold closing step. That is, the lower surface of the upper holding pin 45 abuts on the upper surface of the insert component 5, and the five upper projecting portions 50 of the projecting portion 49 are fitted into the projecting portion fitting holes 47 of the upper holding pin 45.
And the insert component 5 is held by the lower holding pin 41 and the upper holding pin 45. Also in this insert molding method, the deformation and displacement of the insert part 5 can be prevented.

Next, a resin injection step is performed in the same manner as in the insert molding method according to the third and fourth embodiments to form the resin portion 3. The buried portion 10 of the insert part 5 is held by the lower holding pin 41 and the upper holding pin 45, and the upper projecting portion 50 of the projecting member 49.
And the lower protruding portion 52 are fitted in the protruding portion fitting hole 47 of the upper holding pin 45 and the protruding portion fitting hole 43 of the lower holding pin 41, respectively, thereby preventing deformation and displacement of the insert component 5. Can be.

The configuration of the insert molding die 9 used in the insert molding method according to the fifth embodiment will be described. This insert molding die 9 is
The only difference between the insert molding die 9 and the lower holding pin 51 and the upper holding pin 55 as holding members according to the embodiment corresponding to claims 1 and 2 is that
The description of the other components is omitted. Lower holding pin 51
Has a flat surface, and a housing portion 55 is formed on the lower surface of the upper holding pin 53. Further, as shown in FIGS. 10 and 11, five bent pieces 57 as protrusions are formed in the buried portion 10 of the insert component 5. The positions where the five bent pieces 57 are formed are the same as the positions where the small holes 25 are formed.

An insert molding method according to an embodiment corresponding to claim 5 will be described. 10 and 11
As shown in the figure, the insert part disposing step and the mold closing step are performed in the same manner as in the insert molding method according to the third and fourth embodiments. The insert component holding step will be described. At the same time as the insert component arranging step, the upper surfaces of the five lower holding pins 51 are
Abuts on the lower surface of the buried portion 10. At the same time as the mold closing step, the lower surface of the upper holding pin 53 comes into contact with the upper surface of the insert part 5 and the bent piece 57 is
The insert part 5 is held by the lower holding pin 51 and the upper holding pin 53.

Next, a resin injection step is performed in the same manner as in the insert molding method according to the third and fourth embodiments to form the resin portion 3. The buried portion 10 of the insert part 5 is held by the lower holding pin 51 and the upper holding pin 53, and the bent piece 57 of the insert part 5 is housed in the housing part 55 of the upper holding pin 53. 5 can be prevented from being deformed or displaced.

The insert molding die 9 used in the insert molding method according to the third aspect and the insert molding method according to the embodiment according to the third aspect will be described. As shown in FIG. 12, no processing is performed on the insert component 5, and the lower surface of the upper holding pin 61 and the upper surface of the lower holding pin 63 are flat. The other structure is the same as that of the insert molding die 9 according to the first and second embodiments.

The insert component placement step, mold closing step, and resin injection step are performed in the same manner as in the insert molding method according to the fifth embodiment. The insert component holding step will be described. The upper surface of the lower holding pin 63 is brought into contact with the lower surface of the insert component 5 and
Is held in contact with the upper surface of the insert component 5 to hold the insert component 5. According to this method, it is possible to omit the operation of forming a hole or deforming the insert part.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and there are changes in the design without departing from the gist of the present invention. Are also included in the present invention. Gate 3
The position of 5 is not limited to the position in the above embodiment, and as long as the resin is injected into the resin injection space 18,
It can be at any position. In the above embodiment, one of the upper protruding portion 50 and the lower protruding portion 52 is eliminated, and only the other is provided. In addition, the protruding portion fitting hole 47 of the upper holding pin 45 and the lower holding pin Only one of the protrusion fitting holes 43 of the projection 41 may be provided.

Further, in the above embodiment, the bent piece 57 is provided only on the lower surface side of the insert part 5 or on both the upper surface side and the lower surface side. Only, or both the upper holding pin 53 and the lower holding pin 51 may be provided.

[0031]

As described above, according to the present invention, even if a load is applied to the insert part by the resin injected at a high pressure and at a high speed, it is possible to reliably prevent the insert part from being deformed or displaced. In addition, even if the insert molding die moves or vibrates, it is possible to prevent the insert component from shifting from a predetermined position. Since the insert parts are not deformed or displaced, it is possible to prevent a part of the insert parts that should be originally embedded in the resin from being exposed to the outside of the resin. In addition, since the insert parts are not deformed or displaced, the size of the resin molded product can be reduced, and the cost and the molding time can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a resin molded product manufactured using an insert molding die according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which insert parts are arranged in an insert molding die used in an insert molding method according to an embodiment corresponding to claims 3 and 4;

FIG. 3 is a plan view showing a state in which insert parts are arranged in a lower mold of an insert molding die used in an insert molding method according to an embodiment corresponding to claims 3 and 4;

FIG. 4 is a partially enlarged front view showing a holding member of an insert molding die used in an insert molding method according to an embodiment corresponding to claims 3 and 4;

FIG. 5 is a cross-sectional view showing a state in which insert parts are arranged in an insert molding die used in an insert molding method according to an embodiment corresponding to claims 3 and 4, and the mold is closed.

FIG. 6 is a partially enlarged front view showing holding of an insert member by a holding member of an insert molding die used in an insert molding method according to the third and fourth embodiments.

FIG. 7 is a cross-sectional view showing a state where an insert component is arranged in an insert molding die used in an insert molding method according to an embodiment according to claims 3 and 4, the mold is closed, and a resin is injected. is there.

FIG. 8 is a partially enlarged perspective view showing a holding member of an insert molding die used in an insert molding method according to an embodiment corresponding to claim 5;

FIG. 9 is a partially enlarged front view showing a holding member of an insert molding die used in an insert molding method according to an embodiment corresponding to claim 5;

FIG. 10 is a partially enlarged perspective view showing a holding member of an insert molding die used in an insert molding method according to an embodiment corresponding to claim 5;

FIG. 11 is a partially enlarged front view showing a holding member of an insert molding die used in an insert molding method according to an embodiment corresponding to claim 5;

FIG. 12 is a partially enlarged front view showing a holding member of an insert molding die used in an insert molding method according to an embodiment corresponding to claim 3;

FIG. 13 is a cross-sectional view showing a state in which an insert component is deformed in a resin molded product by insert molding according to a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 resin molded product 3 resin portion 4 opening 5 insert component 6 exposed central portion 7 hole 8 exposed end portion 9 insert molding die 10 buried portion 11 upper die 12 insert component storage portion 13 lower die 14 recess 15 lower holding pin 16 recess 17 Pin body 18 Resin injection space 19 Fitting projection 21 Upper holding pin 23 Fitting hole 25 Small hole 31 Cavity 33 Gate 35 Gate opening 41 Lower holding pin 43 Projection fitting hole 45 Upper holding pin 47 Projection fitting hole 49 Projecting member 50 Projecting upward Part 51 Lower holding pin 52 Lower protruding part 53 Upper holding pin 54 Connecting part 55 Housing part 57 Bending piece 61 Upper holding pin 63 Lower holding pin

Claims (5)

[Claims] 1. An insert molding die used for manufacturing a resin molded product by arranging an insert part at a predetermined position in a cavity and injecting a resin into a resin injection space into which a resin is injected in the cavity. 3. The mold for insert molding according to claim 1, further comprising an insert part holding means for holding a predetermined position of the insert part located in the resin injection space. 2. The insert molding die according to claim 1, wherein said insert component holding means comprises a set of a pair of holding members for holding the insert component, and said plurality of sets of said pair of holding members are spaced from each other. A mold for insert molding, wherein the mold is arranged so as to be open. 3. An insert part disposing step for disposing an insert part at a predetermined position in a cavity of an insert molding die, a mold closing step for closing the insert molding die, and a resin in the cavity is injected. An insert molding method comprising: an insert component holding step of holding a predetermined position of the insert component located in a resin injection space; and a resin injection step of injecting a resin into the resin injection space to form a resin portion. . 4. An insert part disposing step of disposing an insert part having a hole located in a resin injection space into which a resin in a cavity of an insert molding die is injected at a predetermined position in the cavity, and insert molding. A mold closing step of closing the mold, and a holding member having a fitting projection is brought into contact with one surface of the insert component arranged in the resin injection space, and the fitting projection is penetrated through the hole, And a holding member having a fitting hole, abutting against the other surface of the insert component arranged in the resin injection space, and an insert component holding step of holding the insert component by fitting into the fitting projection. A resin injection step of injecting a resin into the resin injection space to form a resin portion. 5. An insert part having a projecting portion projecting from at least one surface of a portion located in a resin injection space into which a resin in a cavity of an insert molding die is injected, is inserted into a predetermined position in the cavity. One of the insert parts arranged in the resin injection space, a step of arranging an insert part, a step of closing a mold for insert molding, and a pair of holding members having a protrusion fitting hole on at least one side. An insert part holding step of holding the insert part by fitting the protruding part into the protruding part fitting hole, and injecting a resin into the resin injection space. A resin injection step of forming a resin portion.