JP7120575B2 - Insert molded product and method for molding insert molded product - Google Patents

Description

TECHNICAL FIELD The present invention relates to an insert-molded product having a metal collar and a method for molding this insert-molded product.

Patent Literature 1 discloses an insert-molded product (resin product) provided with a metal collar (metal member). In this insert-molded product, the opening direction of the insert-molding mold and the axial direction of the metal collar are the same.

JP 2013-44341 A

By the way, when performing insert molding, the metal collar is supported from the inside by the core pin of the insert molding die. In this state, the cavity is filled with molten resin, the metal collar and the resin material are integrated, and an insert-molded product is molded. After that, the mold is opened and the insert-molded product is removed from the mold.

Here, if the cylindrical axis direction of the metal collar is tilted with respect to the mold opening direction, the core pin interferes with the metal collar and cannot be pulled out from the metal collar. For this reason, it is necessary to set the direction of the metal collar so that the mold opening direction (the direction of pulling out the core pin) and the axial direction of the metal collar are the same. is occurring.

In view of the above facts, an object of the present invention is to improve the degree of freedom in orientation of a metal collar provided in an insert-molded product.

A metal collar according to a first aspect of the present invention is a cylindrical metal collar provided in an insert-molded product, the inner peripheral surface of which is partially curved in an arc shape in a cross-section along the direction of the cylinder axis. The inner diameter expands from the intermediate portion in the cylinder axis direction toward both ends in the cylinder axis direction.

In the metal collar of the first aspect, a portion from the middle portion to both ends in the cylinder axis direction with respect to the middle portion in the cylinder axis direction supported from the inside by the core pin of the insert molding die (hereinafter referred to as "expanded diameter portion" as appropriate) described.) is wider than the middle part. By providing the enlarged diameter portion in the metal collar in this way, the enlarged diameter portion acts as an escape portion (interference avoidance portion) for the core pin. becomes possible. As a result, it is possible to freely set the axial direction (orientation) of the metal collar with respect to the drawing direction (mold opening direction) of the core pin.

In addition, in the above-described metal collar, a portion of the inner peripheral surface is curved in an arc shape in a cross section along the direction of the cylinder axis. Easier to pull out. Therefore, it is possible to more freely set the direction of the metal collar with respect to the direction in which the core pin is pulled out.

As described above, according to the present invention, it is possible to improve the degree of freedom in the orientation of the metal collar provided in the insert-molded product.

A metal collar according to a second aspect of the present invention is the metal collar according to the first aspect, wherein the insert-molded product is formed with the cylindrical axis direction inclined with respect to the mold opening direction of the mold for molding the insert-molded product. is provided in

In the metal collar of the second aspect, since the expanded diameter portion serves as a relief portion for the core pin, the core pin can be pulled out even if the cylinder axis direction of the metal collar is tilted with respect to the pull-out direction of the core pin. Therefore, the metal collar can be provided on the insert-molded product in a state in which the cylinder axis direction is inclined with respect to the drawing direction (mold opening direction) of the core pin. As a result, the degree of freedom in designing the shape of the peripheral portion of the metal collar of the insert-molded product can be improved.

A metal collar according to a third aspect of the present invention is the metal collar according to the first aspect and the second aspect, in which the entire inner peripheral surface is convex radially inward in a cross section along the cylinder axis direction. curved in an arc.

In the metal collar of the third aspect, the entire inner peripheral surface is curved in a circular arc shape so as to project radially inward in a cross section along the cylinder axis direction, so that the core pin can be pulled out more easily. This makes it possible to more freely set the direction of the metal collar with respect to the direction of withdrawal of the core pin.

A metal collar according to a fourth aspect of the present invention is the metal collar according to the first aspect and the second aspect, wherein in a cross section along the cylinder axis direction, the intermediate portion of the inner peripheral surface in the cylinder axis direction is and both end portions of the inner peripheral surface in the cylinder axis direction are curved in an arc shape.

In the metal collar of the fourth aspect, in a cross section along the cylinder axis direction, an intermediate portion of the inner peripheral surface in the cylinder axis direction extends along the cylinder axis direction, and both end portions of the inner peripheral surface in the cylinder axis direction are arcuate. Since the core pin is curved, it becomes easier to pull out the core pin. This makes it possible to more freely set the direction of the metal collar with respect to the direction of withdrawal of the core pin.

A metal collar according to a fifth aspect of the present invention is the metal collar according to any one of the first to fourth aspects, in which recesses are formed on the outer peripheral surface thereof continuously along the circumferential direction.

In the metal collar of the fifth aspect, since the concave portion is formed continuously along the circumferential direction on the outer peripheral surface, the concave portion is filled with the resin material at the time of insert molding, so that it is firmly fixed to the insert-molded product. be done.

An insert-molded product according to a sixth aspect of the present invention includes a resin portion made of a resin material, and a metal collar according to any one of the first to fifth aspects integrated with the resin portion. there is

In the insert-molded product of the sixth aspect, since a metal collar whose direction (cylinder axis direction) can be freely set with respect to the drawing direction of the core pin is used, the degree of freedom in designing the shape of the peripheral portion of the metal collar can be improved. . That is, it is possible to improve the degree of freedom in designing the insert-molded product.

An insert-molded product according to a seventh aspect of the present invention is the insert-molded product according to the sixth aspect, comprising a plurality of the metal collars, wherein at least two of the metal collars have different cylinder axis directions.

The insert-molded product of the seventh aspect includes a plurality of metal collars, and even if the orientations (cylinder axis directions) of at least two metal collars are different from each other, the core pin can be pulled out. Design freedom is further improved.

A method for molding an insert-molded product according to an eighth aspect of the present invention comprises the steps of: placing the metal collar according to any one of the first to fifth aspects in a cavity of a mold for insert molding; The method includes a step of filling a resin material in a molten state, and a step of opening the mold and removing the integrated resin material and the metal collar from the mold.

In the method for molding an insert-molded product of the eighth aspect, first, the metal collar of any one aspect of the first to fifth aspects is placed in the cavity of the insert molding mold, and then the molten metal collar is placed in the cavity. After filling the resin material and cooling and solidifying the resin material, the mold is opened and the integrated resin material and metal collar are demolded to obtain an insert-molded product. In this case, since a metal collar whose direction (cylinder axis direction) can be freely set with respect to the drawing direction (mold opening direction) of the core pin of the mold is used, the direction of the metal collar is inclined with respect to the drawing direction of the core pin. Also, the core pin can be pulled out from the inside of the metal collar when the mold is opened.

ADVANTAGE OF THE INVENTION This invention can improve the degree of freedom of the direction of the metal collar with which an insert-molding article is equipped.

(A) It is the front view which looked at the metal collar which concerns on one Embodiment of this invention from the cylinder-axis direction. (B) is a cross-sectional view taken along line 1B-1B of FIG. 1(A); (A) is a front view of an insert-molded product according to one embodiment of the present invention. (B) is a side view of the insert-molded product shown in FIG. 2(A) as viewed in the direction of arrow 2B. (C) is a side view of the insert-molded product shown in FIG. 2(A) as viewed in the direction of arrow 2C. 3 is a cross-sectional view taken along line 3-3 of FIG. 2(A); FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 2(A); FIG. FIG. 3 is a cross-sectional view (corresponding to FIG. 3 ) of an insert-molding mold for explaining a method for molding an insert-molded product according to an embodiment of the present invention; FIG. 5 is a cross-sectional view (corresponding to FIG. 4 ) of an insert-molding mold for explaining a method for molding an insert-molded product according to an embodiment of the present invention; FIG. 10 is a cross-sectional view (a cross-sectional view corresponding to FIG. 1(B)) of a metal collar according to another embodiment of the present invention; FIG. 10 is a cross-sectional view (a cross-sectional view corresponding to FIG. 1(B)) of a metal collar according to another embodiment of the present invention;

Next, a metal collar, an insert-molded product, and a molding method for the insert-molded product according to one embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. First, the metal collar 20 and the insert-molded product 30 of this embodiment will be described, and then the method for molding the insert-molded product 30 will be described.

[metal color]
As shown in FIGS. 1(A) and 1(B), the metal collar 20 is a cylindrical member made of a metal material. This metal collar 20 is used for insert molding, which will be described later, and constitutes a part of an insert molded product 30 . Note that the dashed-dotted line in FIG. 1B indicates the central axis XL1 of the metal collar 20. As shown in FIG. In this embodiment, the axial direction of the metal collar 20 (the direction indicated by the arrow X in the drawing) and the extending direction of the central axis XL1 are the same.

In addition, the metal collar 20 has an inner peripheral surface 20A partially curved in an arc shape in a cross section along the cylinder axis direction, and the inner diameter increases from the central part 20B in the cylinder axis direction toward both ends 20C in the cylinder axis direction. spreading. Specifically, the metal collar 20 is curved in an arc shape so that the entire inner peripheral surface 20A protrudes radially inward in a cross section along the cylinder axis direction. Therefore, in the metal collar 20, the inner diameter of a portion (hereinafter referred to as "enlarged diameter portion") 20D from the central portion 20B to both ends 20C is wider than the central portion 20B. Further, in this embodiment, the radius of curvature of the entire inner peripheral surface of the metal collar 20 is the same. The present invention is not limited to this configuration, and the radius of curvature of the entire inner peripheral surface of the metal collar 20 may not be the same. For example, the central portion 20B and the enlarged diameter portion 20D of the metal collar 20 may have different radii of curvature.

A groove-shaped concave portion 22 continuous along the circumferential direction is formed on the outer peripheral surface 20E of the metal collar 20 . The concave portion 22 is filled with a molten resin material during insert molding, which will be described later. Note that the bottom surface 22A is curved in an arc shape so as to protrude inward in the radial direction so that the molten resin material can be easily filled. In the present embodiment, a single recess 22 is formed on the outer peripheral surface 20E of the metal collar 20, but the present invention is not limited to this configuration. 22 may be formed in a plurality of streaks. Also, the cross-sectional shape of the concave portion 22 is not limited to the configuration described above.

[Insert molded product]
Next, the insert molded product 30 will be described.
The insert-molded product 30 is a resin product molded by insert molding, and as shown in FIGS. , and a metal collar 20 integrated with the resin portion 32 . The insert-molded product 30 of this embodiment has two metal collars 20 .

The resin portion 32 of the insert molded product 30 includes a rectangular plate-shaped pedestal 34 on which one metal collar 20 is arranged, and a rectangular plate-shaped pedestal 36 on which the other metal collar 20 is arranged. These pedestals 34 and 36 are inclined in different directions. In the insert-molded product 30 of the present embodiment, the pedestal 34 and the pedestal 36 are arranged side by side, and the step portion between the pedestal 34 and the pedestal 36 is connected by the connecting wall 38 .

The resin portion 32 also includes a side wall 40 projecting from the periphery of the pedestal 34 and the pedestal 36 connected by the connecting wall 38 . The side wall 40 has a rectangular tubular shape and is formed so as to surround the pedestal 34 and the pedestal 36 that are connected to each other. Further, the axial direction of the side wall 40 is different from the thickness direction of the pedestal 34 and the thickness direction of the pedestal 36, respectively. In this embodiment, the axial direction of the side wall 40 and the extending direction of the side wall 40 are the same direction. Moreover, the extending direction of the side wall 40 is the same direction as the mold opening direction (the core pin pulling direction) in insert molding.

The one metal collar 20 is fixed to the pedestal 34 in a state in which the cylindrical axis direction of the one metal collar 20 matches the thickness direction of the pedestal 34, as shown in FIG. The one metal collar 20 is formed integrally with a base 34 that constitutes the resin portion 32 by insert molding. The concave portion 22 of one metal collar 20 is filled with a resin material forming the base 34 . Further, the cylinder axis direction of one metal collar 20 is inclined with respect to the extension direction of the side wall 40 (cylinder axis direction).

The other metal collar 20 is fixed to the pedestal 34 in a state in which the cylinder axis direction of the other metal collar 20 coincides with the thickness direction of the pedestal 34, as shown in FIG. The other metal collar 20 is formed integrally with a pedestal 36 that constitutes the resin portion 32 by insert molding. The concave portion 22 of the other metal collar 20 is filled with the resin material forming the base 36 . Further, the cylinder axis direction of the other metal collar 20 is inclined with respect to the extension direction of the side wall 40 (cylinder axis direction).
Furthermore, in the present embodiment, the pedestal 34 and the pedestal 36 are inclined in different directions, so that the cylinder axial directions of the one metal collar 20 and the other metal collar 20 are also oriented in different directions.

[Molding method of insert molded product]
Next, a method for molding the insert-molded product 30 will be described.
First, the molding apparatus for molding the insert-molded product 30 will be described, and then the molding method will be described.

(Molding equipment)
As shown in FIGS. 5 and 6, the molding device 50 has a mold 52 for insert molding. The mold 52 includes a fixed mold 54 and a movable mold 56 that can move relative to the fixed mold 54 in the mold opening direction (the direction of arrow O) and the mold closing direction (the direction opposite to the direction of arrow O). It is When the fixed mold 54 and the movable mold 56 are mated, a cavity 58 is formed between the fixed mold 54 and the movable mold 56 . The movable die 56 is also provided with core pins 60 and 62 . The core pin 60 protrudes from the cavity surface forming the cavity 58 of the movable mold 56, and is inserted into the metal collar 20 to support the metal collar 20 from the inside and to position the metal collar 20 in the cavity 58. It is designed to Similarly, the core pin 62 protrudes from the cavity surface and is inserted into the metal collar 20 to support the metal collar 20 from the inside. In addition, in the insert-molded product 30 of the present embodiment, the two metal collars 20 are oriented in different directions, but the axial directions of the core pins 60 and 62 that support the two metal collars 20 are different from each other. facing the same direction (mold opening direction). In FIG. 5, the central axis of the core pin 60 is denoted by XL2, and in FIG. 6, the central axis of the core pin 62 is denoted by XL3.

The molding apparatus 50 also has a hopper (not shown) from which a molten resin material is supplied into the cavity 58 through a gate (not shown) provided on the fixed mold 54 .

(Molding method)
Next, a method for molding the insert-molded product 30 using the molding apparatus 50 will be described.

First, the mold 52 is opened (the movable mold 56 is separated from the fixed mold 54), the two metal collars 20 are arranged in the mold 52, and then the mold is closed. In this mold closed state, two metal collars 20 are arranged in the cavity 58 of the mold 52, one metal collar 20 is supported from the inside by the core pin 60, and the other metal collar 20 is supported by the core pin 62 from the inside. Supported.

Next, a molten resin material is supplied (injected) into the cavity 58 from a hopper (not shown) to fill the cavity 58 with the resin material.

After the resin material is cooled and solidified, the mold 52 is opened and the integrated resin material and metal collar 20 are removed from the mold. Thereby, the insert molded product 30 is molded. In the insert-molded product 30 molded in this manner, the two metal collars 20 are fixed in a state in which the direction (cylinder axis direction) is inclined with respect to the mold opening direction of the mold 52 .

Next, the effects of this embodiment will be described.
As shown in FIG. 5, in one metal collar 20, the inner diameter of the portion from the central portion 20B to both ends 20C is larger than the central portion 20B with respect to the central portion 20B supported from the inside by the core pin 60 of the mold 52. spreading. By providing the enlarged diameter portion 20D in one metal collar 20 in this manner, the enlarged diameter portion 20D serves as a relief portion (interference avoidance portion) for the core pin 60, and the axial direction of the one metal collar 20 is the pulling-out direction of the core pin 60. The core pin 60 can be pulled out even if it is tilted with respect to. This makes it possible to freely set the cylinder axis direction (orientation) of one metal collar 20 with respect to the drawing direction of the core pin 60 (the mold opening direction of the mold 52).

Similarly, since the other metal collar 20 is also provided with an enlarged diameter portion 20D, the enlarged diameter portion 20D serves as a relief portion (interference avoidance portion) for the core pin 62, and the axial direction of the other metal collar 20 is aligned with the core pin 62. The core pin 62 can be pulled out even if it is tilted with respect to the pulling direction. This makes it possible to freely set the orientation of the other metal collar 20 with respect to the drawing direction of the core pin 62 (the opening direction of the mold 52).

In addition, in the two metal collars 20, a part of the inner peripheral surface 20A is curved in an arc shape in a cross section along the cylinder axis direction. The core pins 60 and 62 are easily pulled out. Therefore, it is possible to further freely set the orientation of each metal collar 20 with respect to the drawing direction of the core pins 60 and 62 (the opening direction of the mold 52).

As described above, according to the present embodiment, the degree of freedom in orientation of the metal collar 20 provided in the insert-molded product 30 can be improved.

In particular, in the metal collar 20, the entire inner peripheral surface 20A is curved in an arc shape so as to project radially inward in a cross section along the cylinder axis direction, so that the core pins 60 and 62 can be pulled out more easily. Become. This makes it possible to further freely set the orientation of the metal collar 20 with respect to the drawing direction of the core pins 60 and 62 (the opening direction of the mold 52).

Further, in the metal collar 20, the expanded diameter portion 20D serves as a relief portion for the core pins 60, 62. Therefore, even if the cylinder axis direction of the metal collar 20 is inclined with respect to the direction in which the core pins 60, 62 are pulled out, the core pins 60, 62 are not removed. can be pulled out. Therefore, the metal collar 20 can be provided on the insert-molded product 30 in a state in which the cylinder axis direction is inclined with respect to the drawing direction (mold opening direction) of the core pins 60 and 62 . As a result, the degree of freedom in designing the shape of the peripheral portion of the metal collar 20 of the insert-molded product 30 can be improved. That is, the degree of freedom in designing the insert-molded product 30 can be improved.

In the insert-molded product 30, the core pins 60 and 62 can be pulled out even if the two metal collars 20 are oriented in different directions (cylinder axis directions), so that the insert-molded product 30 can be designed more freely. do.

In addition, in the method of molding the insert-molded product 30, the metal collar 20 is used, the orientation (cylinder axis direction) of which can be freely set with respect to the drawing direction (mold opening direction) of the core pins 60, 62 of the mold 52. Therefore, even if the direction of the metal collar 20 is tilted with respect to the direction in which the core pins 60 and 62 are pulled out, the core pins 60 and 62 can be pulled out from the inside of the metal collar 20 when the mold is opened.

Furthermore, in the metal collar 20, since the recesses 22 that are continuous along the circumferential direction are formed on the outer peripheral surface 20E, the insert-molded product 30 is firmly fixed. Specifically, an annular rib-shaped portion is formed by the resin material filled in the recess 22, and the fitting between the rib-shaped portion and the recess 22 prevents the metal collar 20 from being pulled out of the insert-molded product 30. be done.

Moreover, by using the metal collar 20 for insert molding, it is not necessary to use a slide mechanism or the like for the core pin.

Further, as shown in FIGS. 5 and 6, during insert molding, the inner peripheral surface 20A of the metal collar 20 and the outer peripheral surface of the core pin are brought into contact without a break (continuously) over the entire circumference. It is easy to position the metal collar 20 in the orientation.

(Other embodiments)
In the metal collar 20 of the above-described embodiment, the entire inner peripheral surface 20A is curved in an arc shape so as to protrude radially inward in a cross section along the cylinder axis direction. is not limited to For example, like a metal collar 70 shown in FIG. 7, an intermediate portion including a central portion in the cylinder axis direction of the inner peripheral surface 70A is formed as a constant diameter portion 70B extending along the cylinder axis direction, and the inner peripheral surface 70A has a cylinder axis Both ends in the direction may be formed as enlarged diameter portions 70C curved in an arc shape. As with the metal collar 20, the metal collar 70 is also provided with the enlarged diameter portion 70C. can be set freely. Further, for example, like a metal collar 80 shown in FIG. 8, the central portion of the inner peripheral surface 80A in the cylinder axis direction is formed as a minimum inner diameter portion 80B that curves in an arc shape so as to protrude radially inward, A portion (enlarged diameter portion 80D) from the minimum inner diameter portion 80B to both ends 80C in the cylinder axis direction may be a portion where the inner diameter expands at a constant inclination. This metal collar 80 also provides the same effect as the metal collar 20. As shown in FIG.

Further, in the above-described embodiments, the metal collars 20, 70, 80 are cylindrical, but the present invention is not limited to this configuration. For example, the metal collars 20, 70, 80 may be elliptical or oblong cylindrical.

Furthermore, in the above-described embodiment, the two metal collars 20 are oriented (in the cylinder axis direction) at an angle with respect to the mold opening direction of the mold 52, but the present invention is not limited to this configuration. For example, one metal collar 20 may be oriented in the same direction as the opening direction of the mold 52 .

Furthermore, in the above-described embodiment, the metal collar 20 is used for the insert-molded product 30, but the present invention is not limited to this configuration, and may be used for other insert-molded products.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and can be implemented in various modifications other than the above without departing from the spirit of the present invention. is of course.

20 Metal Collar 20A Inner Peripheral Surface 20B Central Part (Intermediate Part)
20C both ends 20E outer peripheral surface 22 concave portion 30 insert molded product 32 resin portion 52 mold (mold for insert molding)
58 Cavity 60 Core Pin 62 Core Pin 70 Metal Collar 70A Inner Peripheral Surface 70B Constant Diameter Part (Intermediate Part)
80 metal collar 80A inner peripheral surface 80B minimum inner diameter portion (intermediate portion)
80C Both ends X Cylinder axis direction O Mold opening direction

Claims (7)

a resin portion made of a resin material;
a cylindrical metal collar integrated with the resin portion;
An insert molded article comprising
The resin portion includes a pedestal on which the metal collar is arranged, and a cylindrical side wall projecting from the peripheral edge of the pedestal,
A portion of the inner peripheral surface of the metal collar is arcuately curved in a cross section along the cylinder axis direction, and the inner diameter expands from an intermediate portion in the cylinder axis direction toward both ends in the cylinder axis direction. ,
the cylinder axis direction of the metal collar is inclined with respect to the extending direction of the side wall,
Insert molded product. a resin portion made of a resin material;
a plurality of cylindrical metal collars integrated with the resin portion;
An insert molded article comprising
A portion of the inner peripheral surface of the metal collar is arcuately curved in a cross section along the cylinder axis direction, and the inner diameter expands from an intermediate portion in the cylinder axis direction toward both ends in the cylinder axis direction. ,
An insert-molded product, wherein the cylinder axis directions of at least two of the metal collars are different from each other. 3. The metal collar according to claim 1 or 2 , wherein in a cross section along the cylinder axis direction, the entire inner peripheral surface is curved in an arcuate shape so as to project radially inward. Insert molded product. In a cross section along the cylinder axis direction, the metal collar has an intermediate portion of the inner circumferential surface extending along the cylinder axis direction and both end portions of the inner circumferential surface in the cylinder axis direction extending along the cylinder axis direction. 3. The insert molded article according to claim 1 or 2 , each curved in an arc shape. The insert-molded product according to any one of claims 1 to 4 , wherein the outer peripheral surface of the metal collar is formed with recesses that are continuous along the circumferential direction. The method for molding an insert-molded product according to any one of claims 1 to 5 ,
placing a metal collar in a cavity of a mold for insert molding;
filling the cavity with a resin material in a molten state;
a step of opening the mold and demolding the integrated resin portion obtained by solidifying the resin material and the metal collar;
A method for molding an insert-molded product having comprising a resin portion made of a resin material and a tubular metal collar integrated with the resin portion;
A portion of the inner peripheral surface of the metal collar is arcuately curved in a cross section along the cylinder axis direction, and the inner diameter expands from an intermediate portion in the cylinder axis direction toward both ends in the cylinder axis direction. ,
A molding method for molding an insert-molded product in which the direction of the cylinder axis of the metal collar is inclined with respect to the pulling direction of the core pin for positioning the metal collar of the mold for molding the resin part. ,
placing the metal collar in a cavity of the mold;
filling the cavity with a resin material in a molten state;
a step of opening the mold and demolding the integrated resin portion obtained by solidifying the resin material and the metal collar;
A method for molding an insert-molded product having

Images