JP2007062040A - Mold for insert molding - Google Patents

Mold for insert molding Download PDF

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JP2007062040A
JP2007062040A JP2005247798A JP2005247798A JP2007062040A JP 2007062040 A JP2007062040 A JP 2007062040A JP 2005247798 A JP2005247798 A JP 2005247798A JP 2005247798 A JP2005247798 A JP 2005247798A JP 2007062040 A JP2007062040 A JP 2007062040A
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mold
cylindrical member
movable
core pin
fixed
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JP4038516B2 (en
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Hidehiro Tokunaga
秀弘 徳永
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for insert molding capable of easily inserting a core pin in a cylindrical member to certainly hold the cylindrical member in spite of the irregularity of the inner diameter of the cylindrical member. <P>SOLUTION: The mold 1 for insert molding is equipped with a movable mold 3 movable in the axial direction of the mold and the fixed mold 4 provided in opposed relation to the movable mold 3 and constituted so as to inject a resin after the cylindrical member 2 is provided to mold it into a predetermined shape. The movable mold 3 has a movable core pin 5 provided with a hollow holding part 7 and a movable base member 6 in which the movable core pin 5 is inserted while the fixed mold 4 has a fixed core pin 8 provided with the penetration part 10 penetrated in the holding part 7 and a fixed base member 9 in which a fixed core pin 8 is incorporated. An axial slit 12 is provided to the holding part 7 and a taper 11 is applied to the holding part 7 toward the fixed mold 4. The holding part 7 is constituted so as to hold the cylindrical member 2 in cooperation with the penetration part 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、筒状部材を内部に設けた後に樹脂を注入して所定の形状を成形するインサート成形金型に関する。   The present invention relates to an insert molding die for molding a predetermined shape by injecting a resin after providing a cylindrical member inside.

従来のインサート成形用金型は、円柱状または円筒状のインサート部材（本発明の「筒状部材」に相当する）を挿嵌、固定するための円周面が形成された保持部材（本発明の「保持部」に相当する）を備えている。
保持部材には、円周面から径方向に盛り上がる突起部が周方向に均等に３箇所以上設けられている（例えば、特許文献１参照）。 A conventional insert molding die has a holding member (invention) in which a circumferential surface for inserting and fixing a columnar or cylindrical insert member (corresponding to the “tubular member” in the invention) is fixed. (Corresponding to “holding part”).
The holding member is provided with three or more protrusions that bulge radially from the circumferential surface in the circumferential direction (see, for example, Patent Document 1).

特開２００４−２４９５６５号公報JP 2004-249565 A

従来のインサート成形用金型では、インサート部材の作成時に生じる内径のばらつきに起因して、以下のような問題点があった。
まず、インサート部材の内径と保持部材との間に形成される隙間が狭い場合、インサート部材が保持部材に接触しながら挿入されるため、インサート部材の内面に傷等が生じ、インサート成形後の部品の品質を悪化させるという問題点があった。
また、インサート部材を保持部材に挿入する際に抵抗力が発生するため、インサート部材ごとの挿入に要する時間が異なる。そのため、インサート部材ごとのインサート成形に要する時間にばらつきが生じ、インサート成形後の部品の品質にばらつきが生じるという問題点もあった。
一方、インサート部材の内径と保持部材との間に形成される隙間が広い場合、インサート部材がぐらついて確実に保持部材に保持されないという問題点もあった。 The conventional mold for insert molding has the following problems due to the variation in the inner diameter that occurs when the insert member is created.
First, when the gap formed between the inner diameter of the insert member and the holding member is narrow, the insert member is inserted while being in contact with the holding member. There was a problem of deteriorating the quality of the.
Moreover, since resistance force generate | occur | produces when inserting an insert member in a holding member, the time required for insertion for every insert member differs. For this reason, there is a problem in that the time required for insert molding for each insert member varies and the quality of the parts after the insert molding varies.
On the other hand, when the gap formed between the inner diameter of the insert member and the holding member is wide, there is also a problem that the insert member wobbles and is not reliably held by the holding member.

この発明は、上記のような問題点を解決することを課題とするものであって、その目的は、筒状部材の内径のばらつきにかかわらず、筒状部材を容易にコアピンに挿入できるとともに確実に保持することができるインサート成形金型を提供することである。   An object of the present invention is to solve the above-described problems. The object of the present invention is to ensure that the cylindrical member can be easily inserted into the core pin regardless of variations in the inner diameter of the cylindrical member. It is providing the insert molding die which can be hold | maintained to.

この発明に係るインサート成形金型は、軸線方向に移動可能な可動側金型と可動側金型に対向して設けられた固定側金型とを備え、筒状部材を内部に設けた後に樹脂を注入して所定の形状を成形するインサート成形金型であって、可動側金型は、中空状の保持部が設けられた可動側コアピンと、可動側コアピンが組み込まれた可動側ベース部材とを有し、固定側金型は、保持部に圧入される圧入部が設けられた固定側コアピンと、固定側コアピンが組み込まれた固定側ベース部材とを有し、保持部には、軸線方向のスリットが設けられているとともに固定側金型に向けてテーパがつけられ、保持部は、圧入部と協同して筒状部材を保持するものである。   The insert molding die according to the present invention includes a movable side die movable in the axial direction and a fixed side die provided to face the movable side die, and is provided with a resin after the cylindrical member is provided inside. The movable mold includes a movable side core pin provided with a hollow holding portion, and a movable side base member incorporating the movable side core pin. The fixed-side mold includes a fixed-side core pin provided with a press-fit portion that is press-fitted into the holding portion, and a fixed-side base member in which the fixed-side core pin is incorporated, and the holding portion has an axial direction The slit is provided and tapered toward the fixed mold, and the holding portion holds the cylindrical member in cooperation with the press-fitting portion.

この発明のインサート成形金型によれば、可動側コアピンの保持部に軸線方向のスリットを設けるとともに固定側金型に向けてテーパをつけ、保持部は、圧入部と協同して筒状部材を保持するので、筒状部材の内径のばらつきにかかわらず、筒状部材を容易にコアピンに挿入できるとともに確実に保持することができる。   According to the insert molding die of the present invention, the holding portion of the movable side core pin is provided with the slit in the axial direction and tapered toward the fixed side die, and the holding portion cooperates with the press-fitting portion to form the cylindrical member. Since it is held, the cylindrical member can be easily inserted into the core pin and reliably held regardless of variations in the inner diameter of the cylindrical member.

以下、この発明の各実施の形態について図に基づいて説明するが、各図において同一、または相当する部材、部位については、同一符号を付して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.

実施の形態１．
図１は、この発明の実施の形態１に係るインサート成形金型１を円筒形部材２とともに示す断面図、図２は、図１の可動側コアピン５の斜視図である。
このインサート成形金型１は、筒状部材である金属製の円筒形部材２を内部に設けた後に樹脂を注入して所定の形状を成形するものであり、軸線が鉛直方向になるように設置されている。
図において、このインサート成形金型１は、軸線方向に移動可能な可動側金型３と、可動側金型３に対向して設けられた固定側金型４とを備えている。可動側金型３の軸線と固定側金型４の軸線とは、一致するように調節されている。 Embodiment 1 FIG.
1 is a cross-sectional view showing an insert molding die 1 according to Embodiment 1 of the present invention together with a cylindrical member 2, and FIG. 2 is a perspective view of a movable core pin 5 of FIG.
The insert molding die 1 is formed by injecting a resin after forming a cylindrical member 2 made of metal, which is a cylindrical member, into a predetermined shape, and is set so that the axis is in the vertical direction. Has been.
In the figure, the insert mold 1 includes a movable mold 3 that is movable in the axial direction, and a fixed mold 4 that is provided to face the movable mold 3. The axis of the movable mold 3 and the axis of the fixed mold 4 are adjusted so as to coincide.

可動側金型３は、円筒形部材２が挿入される可動側コアピン５と、可動側コアピン５が組み込まれた可動側ベース部材６とを有している。可動側コアピン５には、円筒形部材２を保持する中空状の保持部７が設けられている。
固定側金型４は、可動側コアピン５と係合する固定側コアピン８と、固定側コアピン８が組み込まれた固定側ベース部材９とを有している。固定側コアピン８には、保持部７に圧入される圧入部１０が設けられている。 The movable mold 3 has a movable core pin 5 into which the cylindrical member 2 is inserted, and a movable base member 6 in which the movable core pin 5 is incorporated. The movable core pin 5 is provided with a hollow holding portion 7 that holds the cylindrical member 2.
The stationary mold 4 includes a stationary core pin 8 that engages with the movable core pin 5 and a stationary base member 9 in which the stationary core pin 8 is incorporated. The fixed-side core pin 8 is provided with a press-fit portion 10 that is press-fit into the holding portion 7.

保持部７の外周面には、固定側金型４に向けてテーパ１１がつけられている。このテーパ１１がつけられた外周面に対応する保持部７の軸線方向の長さは、円筒形部材２の軸線方向の長さと等しくされている。
また、保持部７には、軸線方向に延びるスリット１２が、周方向に等間隔で６箇所設けられている。このスリット１２の長さは、円筒形部材２の軸線方向の長さと等しくされている。
圧入部１０の外周面には、容易に保持部７に圧入されるように、可動側金型３に向けてテーパがつけられている。 A taper 11 is formed on the outer peripheral surface of the holding portion 7 toward the fixed side mold 4. The length in the axial direction of the holding portion 7 corresponding to the outer peripheral surface provided with the taper 11 is made equal to the length in the axial direction of the cylindrical member 2.
Further, the holding portion 7 is provided with six slits 12 extending in the axial direction at equal intervals in the circumferential direction. The length of the slit 12 is equal to the length of the cylindrical member 2 in the axial direction.
The outer peripheral surface of the press-fit portion 10 is tapered toward the movable mold 3 so that it can be easily press-fitted into the holding portion 7.

ここで、保持部７は、圧入部１０が圧入されることにより、テーパ１１がつけられた外周面が鉛直方向よりも径方向外側に張り出して弾性変形し、円筒形部材２を保持するとともに、円筒形部材２の内周面を押圧して塑性変形させる。
また、可動側金型３には、図示しない注入口から樹脂が充填されるキャビティ１３が形成されている。このキャビティ１３内部の形状を変えることにより、インサート成形後の部品の形状を任意に変化させることができる。 Here, the holding part 7 holds the cylindrical member 2 by elastically deforming the outer peripheral surface with the taper 11 protruding radially outward from the vertical direction by the press-fitting part 10 being press-fitted, The inner peripheral surface of the cylindrical member 2 is pressed and plastically deformed.
The movable mold 3 is formed with a cavity 13 filled with resin from an injection port (not shown). By changing the shape inside the cavity 13, the shape of the part after the insert molding can be arbitrarily changed.

以下、上記構成のインサート成形金型１の作用について、図３および図４を用いて説明する。
図３は、図１の円筒形部材２が、保持部７に挿入された状態を示す断面図、図４は、図１の可動側金型３が、固定側金型４に係合した状態を示す断面図である。 Hereinafter, the operation of the insert molding die 1 having the above configuration will be described with reference to FIGS. 3 and 4.
3 is a cross-sectional view showing a state in which the cylindrical member 2 of FIG. 1 is inserted into the holding portion 7, and FIG. 4 is a state in which the movable mold 3 of FIG. 1 is engaged with the fixed mold 4. FIG.

まず、図３に示すように、円筒形部材２は、可動側コアピン５の保持部７に挿入される。
ここで、保持部７がテーパ１１を有しており、このテーパ１１がつけられた外周面に対応する保持部７の軸線方向の長さは、円筒形部材２の軸線方向の長さと等しくされているので、円筒形部材２は、抵抗なく保持部７に挿入される。 First, as shown in FIG. 3, the cylindrical member 2 is inserted into the holding portion 7 of the movable core pin 5.
Here, the holding portion 7 has a taper 11, and the length in the axial direction of the holding portion 7 corresponding to the outer peripheral surface to which the taper 11 is attached is made equal to the length in the axial direction of the cylindrical member 2. Therefore, the cylindrical member 2 is inserted into the holding part 7 without resistance.

続いて、図４に示すように、可動側金型３は、固定側金型４に向けて移動して係合され、圧入部１０が保持部７に圧入される。
保持部７は、圧入部１０が圧入されることにより、テーパ１１がつけられた外周面が鉛直方向よりも径方向外側に張り出すように弾性変形され、円筒形部材２の内径のばらつきにかかわらず、円筒形部材２が保持される。 Subsequently, as shown in FIG. 4, the movable mold 3 is moved and engaged toward the fixed mold 4, and the press-fitting part 10 is press-fitted into the holding part 7.
The holding portion 7 is elastically deformed so that the outer peripheral surface with the taper 11 protrudes radially outward from the vertical direction when the press-fitting portion 10 is press-fitted, and the variation in the inner diameter of the cylindrical member 2 is affected. Instead, the cylindrical member 2 is held.

ここで、スリット１２の長さは、円筒形部材２の軸線方向の長さと等しくされているので、円筒形部材２の内周面は、軸線方向の全長にわたって保持部７から径方向外側に押圧されている。
また、スリット１２が周方向に等間隔で設けられ、保持部７は、全周にわたって均一に径方向外側に弾性変形されるので、円筒形部材２の内周面は、軸線方向に垂直であるどの断面についても径方向に均一な力で押圧されて塑性変形し、真円度が向上される。 Here, since the length of the slit 12 is made equal to the length of the cylindrical member 2 in the axial direction, the inner peripheral surface of the cylindrical member 2 is pressed radially outward from the holding portion 7 over the entire length in the axial direction. Has been.
Further, the slits 12 are provided at equal intervals in the circumferential direction, and the holding portion 7 is elastically deformed uniformly radially outward over the entire circumference, so that the inner circumferential surface of the cylindrical member 2 is perpendicular to the axial direction. Any cross-section is pressed with a uniform force in the radial direction and plastically deformed, and the roundness is improved.

次に、円筒形部材２が保持されると、注入口から樹脂が充填されて部品が成形される。
ここで、円筒形部材２が保持部７によって確実に保持されるので、円筒形部材２の軸線とインサート成形後の部品の樹脂部分の軸線とが一致するように成形される。 Next, when the cylindrical member 2 is held, resin is filled from the injection port, and a part is molded.
Here, since the cylindrical member 2 is reliably held by the holding portion 7, it is molded so that the axis of the cylindrical member 2 and the axis of the resin portion of the component after insert molding coincide.

この発明の実施の形態１に係るインサート成形金型１によれば、可動側コアピン５の保持部７に軸線方向のスリット１２を設けるとともに固定側金型４に向けてテーパ１１をつけることにより、円筒形部材２を容易にコアピンに挿入することができる。
また、固定側コアピン８の圧入部１０を圧入することによって保持部７の外周面を鉛直方向よりも径方向外側に弾性変形させて円筒形部材２を保持するので、円筒形部材２の内径のばらつきにかかわらず、円筒形部材２を確実に保持することができる。 According to the insert molding die 1 according to Embodiment 1 of the present invention, by providing the holding portion 7 of the movable side core pin 5 with the axial slit 12 and attaching the taper 11 toward the fixed side die 4, The cylindrical member 2 can be easily inserted into the core pin.
Further, the cylindrical member 2 is held by elastically deforming the outer peripheral surface of the holding portion 7 radially outward from the vertical direction by press-fitting the press-fitting portion 10 of the fixed-side core pin 8. The cylindrical member 2 can be reliably held regardless of variations.

また、スリット１２の長さが円筒形部材２の軸線方向の長さと等しくされ、かつ、スリット１２が周方向に等間隔に設けられているので、円筒形部材２の内周面は、軸線方向の全長にわたって保持部７から径方向外側に押圧されるとともに、軸線方向に垂直であるどの断面についても径方向に均一な力で押圧されて押圧されて塑性変形するので、円筒形部材２の内周面の真円度を向上させることができる。
また、円筒形部材２が保持部７によって確実に保持され、円筒形部材２の軸線とインサート成形後の部品の樹脂部分の軸線とが一致するように成形されるので、円筒形部材２の軸線とインサート成形後の部品の樹脂部分の軸線との同軸度を向上させることができる。 Moreover, since the length of the slit 12 is made equal to the length of the cylindrical member 2 in the axial direction, and the slits 12 are provided at equal intervals in the circumferential direction, the inner peripheral surface of the cylindrical member 2 is in the axial direction. Of the cylindrical member 2 because it is pressed radially outward from the holding portion 7 over its entire length, and any cross section perpendicular to the axial direction is pressed and pressed with a uniform force in the radial direction. The roundness of the circumferential surface can be improved.
Further, since the cylindrical member 2 is securely held by the holding portion 7 and is molded so that the axis of the cylindrical member 2 and the axis of the resin portion of the component after insert molding coincide with each other, the axis of the cylindrical member 2 And the axis of the resin part of the part after insert molding can be improved in coaxiality.

なお、上記実施の形態１では、筒状部材を円筒形部材２として説明したが、勿論このものに限定されるものではなく、筒状部材の内周面の形状は、三角形や四角形等他の形状であってもよいし、スリットが内周面の形状に合わせて不等間隔に設けられてもよい。
このものの場合も、上記実施の形態１と同様の効果を奏することができる。 In the first embodiment, the cylindrical member has been described as the cylindrical member 2, but of course the present invention is not limited to this, and the shape of the inner peripheral surface of the cylindrical member may be other such as a triangle or a quadrangle. The shape may be sufficient, and a slit may be provided in unequal intervals according to the shape of an internal peripheral surface.
Also in this case, the same effect as the first embodiment can be obtained.

また、上記実施の形態１では、このインサート成形金型１が縦置きである場合について説明したが、勿論このものに限定されるものではなく、インサート成形金型１は横置きにされていてもよい。
このものの場合も、上記実施の形態１と同様の効果を奏することができる。 Moreover, although the said Embodiment 1 demonstrated the case where this insert molding die 1 was installed vertically, of course, it is not limited to this, Even if the insert molding die 1 is installed horizontally, Good.
Also in this case, the same effect as the first embodiment can be obtained.

また、上記実施の形態１では、スリット１２は６箇所に設けられているとしたが、スリットの数は６箇所に限定されるものではなく、その他の数であってもよい。
スリットの数を増やした場合は、全周にわたってより均一な力が円筒形部材２に働くので、円筒形部材２の内周面の真円度をさらに向上させることができる。 In the first embodiment, the slits 12 are provided at six places. However, the number of slits is not limited to six, and may be any other number.
When the number of slits is increased, a more uniform force acts on the cylindrical member 2 over the entire circumference, so that the roundness of the inner peripheral surface of the cylindrical member 2 can be further improved.

この発明の実施の形態１に係るインサート成形金型を円筒形部材とともに示す断面図である。It is sectional drawing which shows the insert molding metal mold | die which concerns on Embodiment 1 of this invention with a cylindrical member. 図１の可動側コアピンの斜視図である。It is a perspective view of the movable side core pin of FIG. 図１の円筒形部材が、保持部に挿入された状態を示す断面図である。It is sectional drawing which shows the state by which the cylindrical member of FIG. 1 was inserted in the holding | maintenance part. 図１の可動側金型が、固定側金型に係合した状態を示す断面図である。It is sectional drawing which shows the state which the movable side metal mold | die of FIG. 1 engaged with the stationary side metal mold | die.

符号の説明Explanation of symbols

１ インサート成形金型、２ 円筒形部材（筒状部材）、３ 可動側金型、４ 固定側金型、５ 可動側コアピン、６ 可動側ベース部材、７ 保持部、８ 固定側コアピン、９ 固定側ベース部材、１０ 圧入部、１１ テーパ、１２ スリット。   DESCRIPTION OF SYMBOLS 1 Insert molding die, 2 Cylindrical member (tubular member), 3 Movable side die, 4 Fixed side die, 5 Movable side core pin, 6 Movable side base member, 7 Holding part, 8 Fixed side core pin, 9 Fixed Side base member, 10 press-fit part, 11 taper, 12 slit.

Claims (4)

軸線方向に移動可能な可動側金型と前記可動側金型に対向して設けられた固定側金型とを備え、筒状部材を内部に設けた後に樹脂を注入して所定の形状を成形するインサート成形金型であって、
前記可動側金型は、
中空状の保持部が設けられた可動側コアピンと、
前記可動側コアピンが組み込まれた可動側ベース部材と
を有し、
前記固定側金型は、
前記保持部に圧入される圧入部が設けられた固定側コアピンと、
前記固定側コアピンが組み込まれた固定側ベース部材と
を有し、
前記保持部には、前記軸線方向のスリットが設けられているとともに前記固定側金型に向けてテーパがつけられ、
前記保持部は、前記圧入部と協同して前記筒状部材を保持すること
を特徴とするインサート成形金型。 A movable mold that can move in the axial direction and a fixed mold that faces the movable mold are provided, and after a cylindrical member is provided inside, a resin is injected to form a predetermined shape. Insert molding mold
The movable mold is
A movable side core pin provided with a hollow holding portion;
A movable base member in which the movable core pin is incorporated, and
The fixed mold is
A fixed-side core pin provided with a press-fit portion to be press-fitted into the holding portion;
A fixed-side base member in which the fixed-side core pin is incorporated,
The holding portion is provided with a slit in the axial direction and is tapered toward the fixed mold.
The holding part holds the cylindrical member in cooperation with the press-fitting part. 前記テーパがつけられた部分に対応する前記保持部の前記軸線方向の長さは、前記筒状部材の前記軸線方向の長さと等しいことを特徴とする請求項１に記載のインサート成形金型。   The insert molding die according to claim 1, wherein a length of the holding portion corresponding to the tapered portion is equal to a length of the cylindrical member in the axial direction. 前記スリットは、周方向に所定間隔で複数設けられていることを特徴とする請求項１または請求項２に記載のインサート成形金型。   The insert molding die according to claim 1 or 2, wherein a plurality of the slits are provided at predetermined intervals in the circumferential direction. 前記スリットの長さは、前記筒状部材の前記軸線方向の長さと等しいことを特徴とする請求項１から請求項３までの何れか１項に記載のインサート成形金型。   The insert molding die according to any one of claims 1 to 3, wherein a length of the slit is equal to a length of the cylindrical member in the axial direction.
JP2005247798A 2005-08-29 2005-08-29 Insert mold Expired - Fee Related JP4038516B2 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
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JP2007083648A (en) * 2005-09-26 2007-04-05 Kurashiki Kako Co Ltd Mold for molding
JP2014109333A (en) * 2012-12-03 2014-06-12 Toyoda Iron Works Co Ltd Fastening part structure of resin component and its molding equipment
JP2019051650A (en) * 2017-09-15 2019-04-04 東海興業株式会社 Insert molding mold and resin molding product obtained by the same
KR20190126972A (en) * 2018-05-03 2019-11-13 고의환 Apparatus and method for manufacturing through-sleeve for wall retaining wall having multi-threaded thread in which a stopper and a cylindrical part are integrally formed
WO2022270146A1 (en) * 2021-06-24 2022-12-29 三菱電機株式会社 Insert molding mold and method for manufacturing insert molded article

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007083648A (en) * 2005-09-26 2007-04-05 Kurashiki Kako Co Ltd Mold for molding
JP4745004B2 (en) * 2005-09-26 2011-08-10 倉敷化工株式会社 Mold
JP2014109333A (en) * 2012-12-03 2014-06-12 Toyoda Iron Works Co Ltd Fastening part structure of resin component and its molding equipment
WO2014087681A1 (en) * 2012-12-03 2014-06-12 豊田鉄工株式会社 Resin component fastener structure and molding device therefor
CN104837598A (en) * 2012-12-03 2015-08-12 丰田铁工株式会社 Resin component fastener structure and molding device therefor
US10072692B2 (en) 2012-12-03 2018-09-11 Toyoda Iron Works Co., Ltd. Resin component fastener structure and molding device therefor
JP2019051650A (en) * 2017-09-15 2019-04-04 東海興業株式会社 Insert molding mold and resin molding product obtained by the same
KR20190126972A (en) * 2018-05-03 2019-11-13 고의환 Apparatus and method for manufacturing through-sleeve for wall retaining wall having multi-threaded thread in which a stopper and a cylindrical part are integrally formed
KR102096802B1 (en) 2018-05-03 2020-04-03 고의환 Apparatus and Method for the penetration sleeve for the wall retaining wall having multiple thread acid with a cap and a cylindrical members is integrally formed
WO2022270146A1 (en) * 2021-06-24 2022-12-29 三菱電機株式会社 Insert molding mold and method for manufacturing insert molded article

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