JP2015182384A - Injection molding method, injection molding die and molded part - Google Patents

Injection molding method, injection molding die and molded part Download PDF

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JP2015182384A
JP2015182384A JP2014062479A JP2014062479A JP2015182384A JP 2015182384 A JP2015182384 A JP 2015182384A JP 2014062479 A JP2014062479 A JP 2014062479A JP 2014062479 A JP2014062479 A JP 2014062479A JP 2015182384 A JP2015182384 A JP 2015182384A
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mold
thin
molding
injection molding
cooling
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JP6425908B2 (en
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淳 遊佐
Jun Yusa
淳 遊佐
和央 川野
Kazuo Kawano
和央 川野
橋本　晴也
Seiya Hashimoto
晴也 橋本
隆宏 渡邊
Takahiro Watanabe
隆宏 渡邊
正文 折笠
Masafumi Origasa
正文 折笠
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Honda Motor Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an injection molding method, upon injection molding where the first material and the second material are integrally molded, cycle time is reduced, an injection molding die, and a molded part.SOLUTION: Provided is an injection molding method, when the first material m1 and the second material m2 with different compositions are injected into an injection molding die so as to be contacted, thus the first material m1 and the second material m2 are integrally molded, in which the cooling of the thin part 112 with the second material m2 in the first material m1 is made faster compared with the thick plate part 111 on the upstream side continuous to the thin part 112.

Description

本発明は、射出成形方法、射出成形金型および成形品に関する。より詳細には、異なる組成からなる第１材料と第２材料とを一体成型する射出成形方法、射出成形金型および成形品に関する。   The present invention relates to an injection molding method, an injection mold, and a molded product. More specifically, the present invention relates to an injection molding method, an injection mold, and a molded product in which a first material and a second material having different compositions are integrally molded.

従来、車のインストルメントパネル（以下、インパネという）は、デザイン上の観点から上面部と下面部とを異なる色の材料にて成形することがある。
また、インパネは、直射日光が当たり易い上面部を耐熱性に優れた材料にて成形し、直射日光が当たり難い下面部を比較的安価な材料にて成形し、材料コストの低減を図ることがある。
これらのようなインパネは、例えば上面部と下面部とを別々に成形したり、あるいは成形後に一部を塗装したりしていた。このとき、インパネの製造では、別々に形成した部品を接合する工程や塗装工程が必要であり、製造コストの高騰が招かれる。
そこで、２種成形として単一のキャビティに異なる組成の樹脂を射出し、単一の成形品を得る方法が知られている（例えば、特許文献１参照）。
特許文献１に開示された技術では、第１材料の射出および保圧の工程が完了して冷却工程の開始後に、第１材料と第２材料との境界部（接合部）の入れ子を移動（コアバック）させ、第２材料を射出する。 2. Description of the Related Art Conventionally, an instrument panel (hereinafter referred to as an instrument panel) of a car may be formed by using materials of different colors from the viewpoint of design.
In addition, the instrument panel can be formed by molding the upper surface part, which is easily exposed to direct sunlight, with a material having excellent heat resistance, and molding the lower surface part, which is difficult to be exposed to direct sunlight, with a relatively inexpensive material, thereby reducing the material cost. is there.
In such instrument panels, for example, the upper surface portion and the lower surface portion are separately molded, or a part thereof is painted after the molding. At this time, in the manufacture of the instrument panel, a process of joining separately formed parts and a painting process are required, resulting in an increase in manufacturing cost.
In view of this, there is known a method of obtaining a single molded product by injecting resins having different compositions into a single cavity as two-type molding (see, for example, Patent Document 1).
In the technique disclosed in Patent Document 1, the nesting of the boundary part (joint part) between the first material and the second material is moved after the process of injecting and holding the first material is completed and the cooling process is started ( Core back) and inject the second material.

特許第５２３５４７０号公報Japanese Patent No. 5235470

しかしながら、特許文献１に開示された技術では、溶融状態にある第１材料の少なくとも接合部表層が固化するまで入れ子をコアバックさせないため、成形品を得るまでの時間（サイクルタイム）が長くなる課題がある。この課題は、第１材料の接合部表層が溶融状態のときに入れ子をコアバックすると、第２材料を充填すべき空間に第１材料が流れ込んでしまい、接合部の位置がずれてしまい、成形品の外観が損なわれること（デフォームの発生）に繋がることを理由とする。   However, in the technique disclosed in Patent Document 1, since the insert is not core-backed until at least the joint surface layer of the first material in a molten state is solidified, the time (cycle time) until obtaining a molded product is long There is. This problem is that if the core of the nest is backed when the surface layer of the joint portion of the first material is in a molten state, the first material flows into the space to be filled with the second material, the position of the joint portion is shifted, and molding is performed. This is because the appearance of the product is impaired (deformation).

本発明は上記課題を解決するためのものであり、その目的は、第１材料と第２材料とを一体成型する射出成形時のサイクルタイムを短縮する射出成形方法、射出成形金型および成形品を提供することにある。   An object of the present invention is to solve the above-described problems, and an object of the present invention is to provide an injection molding method, an injection mold, and a molded article that shorten the cycle time during injection molding in which the first material and the second material are integrally molded. Is to provide.

（１）異なる組成からなる第１材料（例えば、後述の第１材料ｍ１）および第２材料（例えば、後述の第２材料ｍ２）を金型（例えば、後述の射出成形金型１）内に射出して接触させることにより、前記第１材料と前記第２材料とを一体成型する射出成形方法であって、前記第１材料における前記第２材料との接合部（例えば、後述の薄肉部１１２）の冷却を、前記接合部に連続する上流側に比して早めることを特徴とする射出成形方法。   (1) A first material (for example, a first material m1 described later) and a second material (for example, a second material m2 described later) having different compositions are placed in a mold (for example, an injection mold 1 described later). An injection molding method for integrally molding the first material and the second material by injecting them into contact with each other, wherein the first material is joined to the second material (for example, a thin portion 112 described later). ) Is accelerated compared to the upstream side continuous with the joint.

（１）の発明によれば、第１材料における第２材料との接合部の冷却を、接合部に連続する上流側に比して早める。これにより、第２材料を射出させる前に、第１材料における第２材料との接合部の冷却固化が促進できる。このように接合部近傍の固化が短時間で済むことにより、第１材料が第２材料を充填すべき空間に流入せず、第２材料の射出タイミングが早まる。よって、第１材料の成形工程と第２材料の成形工程との期間が一部重複する。その結果、第１材料と第２材料とを一体成型する射出成形時のサイクルタイムを短縮することができる。   According to the invention of (1), the cooling of the joint portion between the first material and the second material is accelerated compared to the upstream side continuous with the joint portion. Thereby, before injecting a 2nd material, the cooling solidification of the junction part with the 2nd material in a 1st material can be accelerated | stimulated. Thus, since the solidification in the vicinity of the joint portion is completed in a short time, the first material does not flow into the space to be filled with the second material, and the injection timing of the second material is advanced. Therefore, the periods of the first material molding process and the second material molding process partially overlap. As a result, the cycle time at the time of injection molding for integrally molding the first material and the second material can be shortened.

（２）前記第１材料における前記第２材料との前記接合部を、前記接合部に連続する上流側に比して板厚を薄くすることを特徴とする（１）に記載の射出成形方法。   (2) The injection molding method according to (1), wherein a thickness of the joint portion of the first material with the second material is made thinner than an upstream side continuous with the joint portion. .

（２）の発明によれば、第１材料における第２材料との接合部を、接合部に連続する上流側に比して板厚を薄くする。これにより、第１材料における第２材料との接合部の冷却を、接合部に連続する上流側に比して早められる。   According to the invention of (2), the thickness of the joint portion between the first material and the second material is reduced compared to the upstream side continuous with the joint portion. Thereby, cooling of the junction part with the 2nd material in the 1st material is advanced compared with the upstream which follows a junction part.

（３）前記第１材料における前記第２材料との前記接合部の冷却固化に伴って生じる体積収縮差を、下流側端に向けて徐々に変化させることを特徴とする（１）または（２）に記載の射出成形方法。   (3) The volume shrinkage difference caused by cooling and solidifying the joint portion of the first material with the second material is gradually changed toward the downstream end (1) or (2) ) Injection molding method.

（３）の発明によれば、第１材料における第２材料との接合部の冷却固化に伴って生じる体積収縮差を、下流側端に向けて徐々に変化させる。これにより、接合部の冷却固化に伴って生じる体積収縮差が下流側端に向かうほど低下するように徐々に変化できる。そのため、接合部近傍にて大きな体積収縮差が発生せず、製品意匠面における歪み（デフォーム）の発生が抑制できる。   According to the invention of (3), the volume shrinkage difference caused by cooling and solidifying the joint portion of the first material with the second material is gradually changed toward the downstream end. Thereby, it can change gradually so that the volume shrinkage difference which arises with the cooling solidification of a junction part may fall, so that it goes to a downstream end. Therefore, a large volume shrinkage difference does not occur in the vicinity of the joint, and the occurrence of distortion (deformation) on the product design surface can be suppressed.

（４）前記第１材料における前記第２材料との前記接合部の厚みを、下流側端に向けて徐々に変化させることを特徴とする（１）から（３）のいずれか１項に記載の射出成形方法。   (4) In any one of (1) to (3), the thickness of the joint portion of the first material with the second material is gradually changed toward the downstream end. Injection molding method.

（４）の発明によれば、第１材料における第２材料との接合部の厚みを、下流側端に向けて徐々に変化させる。これにより、第１材料における第２材料との接合部の厚みが下流側端に向かうほど薄くなるように徐々に変化できる。そのため、接合部の冷却固化に伴って生じる体積収縮差が板厚変化と共に下流側端に向かうほど低下するように徐々に変化できる。その結果、成形品が簡素な構成であっても、接合部近傍にて大きな板厚変化および体積収縮差が発生せず、製品意匠面における歪み（デフォーム）の発生が抑制できる。   According to the invention of (4), the thickness of the joint portion between the first material and the second material is gradually changed toward the downstream end. Thereby, it can change gradually so that the thickness of the junction part with the 2nd material in the 1st material may become so thin that it goes to a downstream end. For this reason, the volume shrinkage difference caused by the cooling and solidification of the joint portion can be gradually changed so as to decrease toward the downstream end along with the plate thickness change. As a result, even if the molded product has a simple configuration, a large plate thickness change and volume shrinkage difference do not occur in the vicinity of the joint, and the occurrence of distortion (deformation) on the product design surface can be suppressed.

（５）第１材料（例えば、後述の第１材料ｍ１）を成形する第１キャビティ部（例えば、後述の第１キャビティ部６ａ）を構成すると共に、前記第１材料の成形後に移動して第２材料（例えば、後述の第２材料ｍ２）を成形する第２キャビティ部（例えば、後述の第２キャビティ部６ｂ）を形成する仕切り部材（例えば、後述の可動コア型５）を備え、前記第１キャビティ部は、前記第１材料における前記第２材料との接合部（例えば、後述の薄肉部１１２）を、前記接合部に連続する上流側に比して板厚を薄くする薄肉部に形成することを特徴とする射出成形金型。   (5) A first cavity portion (for example, a first cavity portion 6a described later) for forming a first material (for example, a first material m1 described later) is configured and moved after the first material is molded and moved to a first cavity. A partition member (for example, a movable core mold 5 to be described later) for forming a second cavity part (for example, a second cavity part 6b to be described later) for molding two materials (for example, a second material m2 to be described later), The first cavity portion is formed in a thin portion where the thickness of the joint portion (for example, a thin portion 112 described later) of the first material is reduced compared to the upstream side continuous with the joint portion. An injection mold characterized by performing.

（５）の発明によれば、第１材料における第２材料との接合部を、接合部に連続する上流側に比して板厚を薄くする薄肉部に形成する。これにより、第２材料を射出させる前に、薄肉部に形成された第１材料における第２材料との接合部の冷却固化が促進できる。このように接合部近傍の固化が短時間で済むことにより、第１材料が第２材料を充填すべき空間に流入せず、第２材料の射出タイミングが早まる。よって、第１材料の成形工程と第２材料の成形工程との期間が一部重複する。その結果、第１材料と第２材料とを一体成型する射出成形時のサイクルタイムを短縮することができる。   According to invention of (5), the junction part with the 2nd material in a 1st material is formed in the thin part which makes plate | board thickness thin compared with the upstream which follows a junction part. Thereby, before injecting a 2nd material, the cooling solidification of the junction part with the 2nd material in the 1st material formed in the thin part can be accelerated | stimulated. Thus, since the solidification in the vicinity of the joint portion is completed in a short time, the first material does not flow into the space to be filled with the second material, and the injection timing of the second material is advanced. Therefore, the periods of the first material molding process and the second material molding process partially overlap. As a result, the cycle time at the time of injection molding for integrally molding the first material and the second material can be shortened.

（６）前記仕切り部材は、少なくとも前記薄肉部との接触部を前記薄肉部以外の部位に比して高い熱伝導率を有する部材にて構成されることを特徴とする（５）に記載の射出成形金型。   (6) The partition member is configured by a member having a high thermal conductivity at least in contact with the thin portion as compared with a portion other than the thin portion. Injection mold.

（６）の発明によれば、仕切り部材の少なくとも薄肉部との接触部を薄肉部以外の部位に比して高い熱伝導率を有する部材に構成される。これにより、第２材料を射出させる前に、薄肉部は自身の熱を仕切り部材の少なくとも薄肉部との接触部に伝熱できる。そのため、第１材料における第２材料との接合部である薄肉部の冷却固化がより促進できる。   According to invention of (6), it is comprised in the member which has high thermal conductivity compared with site | parts other than a thin part about the contact part with the thin part at least of a partition member. Thereby, before injecting a 2nd material, a thin part can transmit an own heat to a contact part with the at least thin part of a partition member. Therefore, the cooling solidification of the thin part which is a junction part with the 2nd material in the 1st material can be promoted more.

（７） 異なる組成からなる第１材料（例えば、後述の第１材料ｍ１）および第２材料（例えば、後述の第２材料ｍ２）を金型（例えば、後述の射出成形金型１）内に射出して接触させることにより、前記第１材料と前記第２材料とを一体成型した成形品（例えば、後述のインパネ１００）であって、前記第１材料における前記第２材料との接合部（例えば、後述の薄肉部１１２）を、前記接合部に連続する上流側に比して板厚を薄くする薄肉部に形成したことを特徴とする成形品。   (7) A first material (for example, a first material m1 described later) and a second material (for example, a second material m2 described later) having different compositions are placed in a mold (for example, an injection mold 1 described later). A molded product (for example, an instrument panel 100 described later) in which the first material and the second material are integrally molded by being injected and brought into contact with each other. For example, a molded product characterized in that a thin portion 112), which will be described later, is formed in a thin portion that is thinner than the upstream side continuous with the joint portion.

（７）の発明によれば、（５）の発明と同様の作用・効果を奏する。   According to the invention of (7), there are the same operations and effects as the invention of (5).

本発明によれば、第１材料と第２材料とを一体成型する射出成形時にサイクルタイムを短縮する射出成形方法、射出成形金型および成形品を提供することができる。   According to the present invention, it is possible to provide an injection molding method, an injection mold, and a molded product that shorten the cycle time at the time of injection molding in which the first material and the second material are integrally molded.

本発明の実施形態に係る射出成形金型を示す断面図である。It is sectional drawing which shows the injection mold which concerns on embodiment of this invention. 本発明の実施形態に係るインパネを示す断面図である。It is sectional drawing which shows the instrument panel which concerns on embodiment of this invention. 上記実施形態に係る射出成形の工程群のタイムチャートを示す図である。It is a figure which shows the time chart of the process group of the injection molding which concerns on the said embodiment. 上記実施形態に係る射出成形の工程群を説明する図であり、（ａ）が第１材料充填工程を示し、（ｂ）が第１材料保圧工程を示し、（ｃ）が第１材料保圧工程かつ第２材料充填工程を示し、（ｄ）が第１材料保圧工程かつ第２材料保圧工程を示し、（ｅ）が第１材料冷却工程かつ第２材料保圧工程を示し、（ｆ）が第１材料冷却工程かつ第２材料冷却工程を示す。It is a figure explaining the process group of the injection molding which concerns on the said embodiment, (a) shows a 1st material filling process, (b) shows a 1st material pressure holding process, (c) is a 1st material holding process. A pressure step and a second material filling step, (d) showing a first material pressure holding step and a second material pressure holding step, (e) showing a first material cooling step and a second material pressure holding step, (F) shows a 1st material cooling process and a 2nd material cooling process.

以下、本発明の実施形態について、図面を参照しながら詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

まず、射出成形金型１について説明する。
図１は、本実施形態に係る射出成形金型１を示す断面図である。図２は、本実施形態に係るインパネ１００を示す断面図である。
図１に示すように、射出成形金型１は、樹脂成形品の一例として車のインパネ１００を成形する。射出成形金型１は、異なる組成からなる第１材料ｍ１および第２材料ｍ２を当該金型１内に射出して接触させることにより、第１材料ｍ１と第２材料ｍ２とを一体成型する。
射出成形金型１は、上型２と、第１下型３と、第２下型４と、可動コア型５と、を備える。 First, the injection mold 1 will be described.
FIG. 1 is a cross-sectional view showing an injection mold 1 according to this embodiment. FIG. 2 is a cross-sectional view showing the instrument panel 100 according to the present embodiment.
As shown in FIG. 1, the injection mold 1 forms an instrument panel 100 of a car as an example of a resin molded product. The injection mold 1 integrally molds the first material m1 and the second material m2 by injecting the first material m1 and the second material m2 having different compositions into the mold 1 and bringing them into contact with each other.
The injection mold 1 includes an upper mold 2, a first lower mold 3, a second lower mold 4, and a movable core mold 5.

上型２は、固定型であり、下面２１を有する。上型２の下面２１には、可動コア型５と第２下型４との境界線の鉛直上に突状部２２が設けられる。突状部２２は、一定の高さおよび幅を有し、可動コア型５側の端部領域に沿って延在する。上型２には、上型２の内部を冷却水が循環する冷却水路２３が設けられる。上型２は、内部に冷却水路２３を設けることで、上型２の下面２１を他の部位に比して高い冷却効果を有する部材に構成される。   The upper mold 2 is a fixed mold and has a lower surface 21. On the lower surface 21 of the upper mold 2, a projecting portion 22 is provided vertically above the boundary line between the movable core mold 5 and the second lower mold 4. The projecting portion 22 has a certain height and width, and extends along the end region on the movable core mold 5 side. The upper mold 2 is provided with a cooling water passage 23 through which cooling water circulates inside the upper mold 2. The upper mold | type 2 is comprised in the member which has the high cooling effect compared with another site | part by providing the cooling water channel 23 in the inside, and the lower surface 21 of the upper mold | type 2 compared with another site | part.

第１下型３は、上型２に対向して型開きする可動型であり、上型２の下面２１に平行する上面３１を有する。第１下型３は、可動コア型５に隣接する。第１下型３には、第１下型３の内部を冷却水が循環する冷却水路３２が設けられる。第１下型３は、内部に冷却水路３２を設けることで、第１下型３の上面３１を他の部位に比して高い冷却効果を有する部材に構成される。   The first lower mold 3 is a movable mold that opens and faces the upper mold 2, and has an upper surface 31 that is parallel to the lower surface 21 of the upper mold 2. The first lower mold 3 is adjacent to the movable core mold 5. The first lower mold 3 is provided with a cooling water passage 32 through which cooling water circulates inside the first lower mold 3. The first lower mold 3 is configured as a member having a cooling effect higher than that of the other portion of the upper surface 31 of the first lower mold 3 by providing the cooling water passage 32 therein.

第２下型４は、上型２に対向して型開きする可動型であり、上型２の下面２１に平行する上面４１を有する。第２下型４は、第１下型３とは反対側にて可動コア型５に隣接する。第２下型４には、第２下型４の内部を冷却水が循環する冷却水路４２が設けられる。第２下型４は、内部に冷却水路４２を設けることで、第２下型４の上面４１を他の部位に比して高い冷却効果を有する部材に構成される。   The second lower mold 4 is a movable mold that opens and faces the upper mold 2, and has an upper surface 41 that is parallel to the lower surface 21 of the upper mold 2. The second lower mold 4 is adjacent to the movable core mold 5 on the side opposite to the first lower mold 3. The second lower mold 4 is provided with a cooling water passage 42 through which cooling water circulates inside the second lower mold 4. The second lower mold 4 is configured as a member having a cooling effect higher than that of the other portion of the upper surface 41 of the second lower mold 4 by providing the cooling water passage 42 therein.

可動コア型５は、第１下型３と第２下型４との間に別個独立して上下動可能に配置される。可動コア型５は、上型２の突状部２２に接触可能な上面５１を有する。可動コア型５の上面５１は、上型２の突状部２２に向かうほど上面５１の位置が高まる傾斜面５１ａと、上型２の突状部２２に接触可能なように傾斜面５１ａの最高位置から平坦に連続する平坦面５１ｂと、を有する。可動コア型５は、ＢｅＣｕなどの高い熱伝導率を有する部材にて構成される。可動コア型５には、可動コア型５の内部を冷却水が循環する冷却水路５２が設けられる。可動コア型５は、ＢｅＣｕなどの高い熱伝導率を有する部材にて構成され、かつ、内部に冷却水路５２を設けることで、可動コア型５の上面５１を他の部位あるいは他の型に比して高い熱伝導率かつ冷却効果を有する部材に構成される。   The movable core mold 5 is disposed between the first lower mold 3 and the second lower mold 4 so as to be independently movable up and down. The movable core mold 5 has an upper surface 51 that can contact the protruding portion 22 of the upper mold 2. The upper surface 51 of the movable core mold 5 has an inclined surface 51a in which the position of the upper surface 51 increases toward the protruding portion 22 of the upper mold 2 and the highest of the inclined surface 51a so as to be in contact with the protruding portion 22 of the upper mold 2. And a flat surface 51b that is flat and continuous from the position. The movable core mold 5 is composed of a member having high thermal conductivity such as BeCu. The movable core mold 5 is provided with a cooling water passage 52 through which cooling water circulates inside the movable core mold 5. The movable core mold 5 is composed of a member having high thermal conductivity such as BeCu, and the cooling water channel 52 is provided inside, so that the upper surface 51 of the movable core mold 5 is compared with other parts or other molds. Thus, it is configured as a member having a high thermal conductivity and a cooling effect.

可動コア型５は、第１材料ｍ１を成形する第１キャビティ部６ａを構成すると共に、第１材料ｍ１の成形後に移動して第２材料ｍ２を成形する第２キャビティ部６ｂを形成する。   The movable core mold 5 constitutes a first cavity part 6a for molding the first material m1, and forms a second cavity part 6b that moves after the molding of the first material m1 and molds the second material m2.

第１キャビティ部６ａは、上型２と第１下型３および可動コア型５との間に形成される。第１キャビティ部６ａは、上型２の突状部２２と上方に移動した可動コア型５の上面５１の平坦面５１ｂとの接触部を図示左側から流入する第１材料ｍ１の下流側端として上型２と第１下型３との間の上流側から第１材料ｍ１を射出される。   The first cavity portion 6 a is formed between the upper mold 2, the first lower mold 3 and the movable core mold 5. The first cavity portion 6a has a contact portion between the protruding portion 22 of the upper mold 2 and the flat surface 51b of the upper surface 51 of the movable core mold 5 moved upward as a downstream end of the first material m1 flowing from the left side in the figure. The first material m1 is injected from the upstream side between the upper mold 2 and the first lower mold 3.

第１キャビティ部６ａは、第１材料ｍ１によって厚板部１１１と薄肉部１１２とからなるインパネ１００の第１成形部１１０を成形する。第１キャビティ部６ａは、上型２側にてインパネ１００の製品意匠面Ａ側を成形する。第１キャビティ部６ａは、第１下型３および可動コア型５側にてインパネ１００の製品裏面Ｂ側を成形する。第１キャビティ部６ａは、上型２と第１下型３との間にて、第１成形部１１０の厚板部１１１を一定の板厚に成形する。第１キャビティ部６ａは、上型２と可動コア型５との間にて、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２を、この薄肉部１１２に連続する上流側の厚板部１１１に比して板厚を薄くするように成形する。   The 1st cavity part 6a shape | molds the 1st shaping | molding part 110 of the instrument panel 100 which consists of the thick board part 111 and the thin part 112 with the 1st material m1. The 1st cavity part 6a shape | molds the product design surface A side of the instrument panel 100 in the upper mold | type 2 side. The first cavity portion 6a molds the product rear surface B side of the instrument panel 100 on the first lower mold 3 and the movable core mold 5 side. The first cavity portion 6 a forms the thick plate portion 111 of the first forming portion 110 to a constant plate thickness between the upper die 2 and the first lower die 3. The first cavity portion 6a includes a thin plate 112 that joins the second material m2 in the first material m1 between the upper mold 2 and the movable core mold 5, and an upstream thick plate that is continuous with the thin portion 112. Molding is performed so that the plate thickness is smaller than that of the portion 111.

第１キャビティ部６ａは、薄肉部１１２を形成する上型２と可動コア型５との間にて、第１成形部１１０の徐径部１１２ａおよび薄板部１１２ｂを成形する。   The first cavity portion 6 a forms the reduced diameter portion 112 a and the thin plate portion 112 b of the first forming portion 110 between the upper die 2 that forms the thin portion 112 and the movable core die 5.

第１キャビティ部６ａは、可動コア型５の上面５１が傾斜面５１ａに構成されることにより、第１成形部１１０の徐径部１１２ａを、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２に連続する上流側の厚板部１１１に比して板厚を薄くする。第１キャビティ部６ａの徐径部１１２ａを形成する領域は、可動コア型５の上面５１である傾斜面５１ａが下流側端に向かうほど可動コア型５の上面５１の位置を高めることにより、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２の厚みが下流側端に向かうほど薄くなるように徐々に変化する。第１キャビティ部６ａの徐径部１１２ａを形成する領域は、薄肉部１１２の冷却固化に伴って生じる体積収縮差が板厚変化と共に下流側端に向かうほど低下するように徐々に変化するよう構成される。   The first cavity portion 6a has a thin wall that joins the reduced diameter portion 112a of the first molded portion 110 to the second material m2 in the first material m1 by configuring the upper surface 51 of the movable core mold 5 to be the inclined surface 51a. The plate thickness is made thinner than that of the upstream thick plate portion 111 continuous with the portion 112. The region where the gradual diameter portion 112a of the first cavity portion 6a is formed is obtained by increasing the position of the upper surface 51 of the movable core mold 5 as the inclined surface 51a, which is the upper surface 51 of the movable core mold 5, moves toward the downstream end. The thickness of the thin portion 112 joined to the second material m2 in the one material m1 gradually changes so as to become thinner toward the downstream end. The region where the reduced diameter portion 112a of the first cavity portion 6a is formed is configured to gradually change so that the volume shrinkage difference caused by cooling and solidification of the thin portion 112 decreases toward the downstream end along with the plate thickness change. Is done.

第１キャビティ部６ａは、可動コア型５の上面５１が平坦面５１ｂに構成されることにより、第１成形部１１０の薄板部１１２ｂを、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２に連続する上流側の厚板部１１１に比して板厚を薄くする。第１キャビティ部６ａの薄板部１１２ｂを形成する領域は、可動コア型５の上面５１である平坦面５１ｂが可動コア型５の上面５１の位置が傾斜面５１ａの最高位置から一定であることにより、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２の厚みが薄くなる状態が連続する。   The first cavity portion 6a is a thin-walled portion that joins the thin plate portion 112b of the first molding portion 110 with the second material m2 in the first material m1 by configuring the upper surface 51 of the movable core mold 5 to be a flat surface 51b. The plate thickness is made thinner than that of the upstream thick plate portion 111 continuing to 112. The region where the thin plate portion 112b of the first cavity portion 6a is formed is that the flat surface 51b which is the upper surface 51 of the movable core mold 5 is located at a constant position from the highest position of the inclined surface 51a. The state in which the thickness of the thin portion 112 joined to the second material m2 in the first material m1 becomes thin continues.

第２キャビティ部６ｂは、上型２と第２下型４および可動コア型５との間に形成される。第２キャビティ部６ｂは、第１材料ｍ１の薄肉部１１２と下方に所定距離移動（コアバック）した可動コア型５の上面５１との接触部を図示右側から流入する第２材料ｍ２の下流側端として上型２と第２下型４との間の上流側から第２材料ｍ２を射出される。すなわち、第２材料ｍ２の射出方向は、第１材料ｍ１とは反対方向になる。   The second cavity portion 6 b is formed between the upper die 2, the second lower die 4 and the movable core die 5. The second cavity portion 6b is a downstream side of the second material m2 that flows in from the right side of the drawing at the contact portion between the thin portion 112 of the first material m1 and the upper surface 51 of the movable core mold 5 moved downward (core back) by a predetermined distance. The second material m2 is injected from the upstream side between the upper mold 2 and the second lower mold 4 as an end. That is, the injection direction of the second material m2 is opposite to the first material m1.

第２キャビティ部６ｂは、第２材料ｍ２によって厚板部１２１と薄肉部１２２とからなるインパネ１００の第２成形部１２０を成形する。第２キャビティ部６ｂは、上型２側にてインパネ１００の製品意匠面Ａ側を成形する。第２キャビティ部６ｂは、第２下型４および可動コア型５側にてインパネ１００の製品裏面Ｂ側を成形する。第２キャビティ部６ｂは、上型２と第２下型４との間にて、第２成形部１２０の厚板部１２１を一定の板厚に成形する。第２キャビティ部６ｂは、上型２の下面２１の突状部２２および突状部２２に連続する第１材料ｍ１の薄肉部１１２と可動コア型５との間にて、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２を、この薄肉部１２２に連続する上流側の厚板部１２１に比して板厚を薄くするように成形する。   The 2nd cavity part 6b shape | molds the 2nd shaping | molding part 120 of the instrument panel 100 which consists of the thick board part 121 and the thin part 122 with the 2nd material m2. The 2nd cavity part 6b shape | molds the product design surface A side of the instrument panel 100 in the upper mold | type 2 side. The second cavity portion 6b molds the product rear surface B side of the instrument panel 100 on the second lower mold 4 and the movable core mold 5 side. The second cavity portion 6b molds the thick plate portion 121 of the second molding portion 120 to a constant plate thickness between the upper mold 2 and the second lower mold 4. The second cavity portion 6b is formed between the protruding portion 22 of the lower surface 21 of the upper mold 2 and the thin portion 112 of the first material m1 continuous to the protruding portion 22, and the movable core mold 5 in the second material m2. The thin portion 122 joined to the first material m1 is formed so as to be thinner than the upstream thick plate portion 121 continuous with the thin portion 122.

第２キャビティ部６ｂは、薄肉部１２２を形成する第１材料ｍ１の薄肉部１１２と可動コア型５との間にて、第２成形部１２０の薄板部１２２ａおよび傾斜先端部１２２ｂを成形する。   The second cavity portion 6b forms the thin plate portion 122a and the inclined tip portion 122b of the second forming portion 120 between the thin portion 112 of the first material m1 forming the thin portion 122 and the movable core mold 5.

第２キャビティ部６ｂは、可動コア型５の上面５１が平坦面５１ｂに構成されることにより、第２成形部１２０の薄板部１２２ａを、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２に連続する上流側の厚板部１２１に比して板厚を薄くする。第２キャビティ部６ｂの薄板部１２２ａを形成する領域は、可動コア型５の上面５１である平坦面５１ｂが可動コア型５の上面５１の位置が傾斜面５１ａの最高位置から一定であることにより、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２の厚みが一定になる状態が連続する。   The second cavity portion 6b is a thin-walled portion that joins the thin plate portion 122a of the second molding portion 120 with the first material m1 in the second material m2 by configuring the upper surface 51 of the movable core mold 5 to be a flat surface 51b. The plate thickness is made thinner than that of the upstream thick plate portion 121 continuing to 122. The region where the thin plate portion 122a of the second cavity portion 6b is formed is that the flat surface 51b which is the upper surface 51 of the movable core mold 5 is located at a constant position from the highest position of the inclined surface 51a. The state where the thickness of the thin portion 122 joined to the first material m1 in the second material m2 becomes constant continues.

第２キャビティ部６ｂは、可動コア型５の上面５１が傾斜面５１ａに構成されることにより、第２成形部１２０の傾斜先端部１２２ｂを、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２に連続する上流側の厚板部１２１に比して板厚を薄くする。第２キャビティ部６ｂの傾斜先端部１２２ｂを形成する領域は、可動コア型５の上面５１である傾斜面５１ａが下流側端に向かうほど可動コア型５の上面５１の位置を低めることにより、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２が下方に傾斜する先端となるように変化する。第２キャビティ部６ｂの傾斜先端部１２２ｂを形成する領域は、一定の高さを有することにより、薄肉部１２２の冷却固化に伴って生じる体積収縮差および板厚変化がほとんどないよう構成される。   The second cavity portion 6b has a thin wall that joins the inclined tip portion 122b of the second molding portion 120 to the first material m1 in the second material m2 by configuring the upper surface 51 of the movable core mold 5 to be the inclined surface 51a. The plate thickness is made thinner than that of the upstream thick plate portion 121 continuous with the portion 122. The region where the inclined tip portion 122b of the second cavity portion 6b is formed can be obtained by lowering the position of the upper surface 51 of the movable core mold 5 as the inclined surface 51a, which is the upper surface 51 of the movable core mold 5, moves toward the downstream end. It changes so that the thin part 122 joined to the 1st material m1 in the 2 materials m2 may become the front-end | tip inclined downward. The region in which the inclined tip portion 122b of the second cavity portion 6b is formed has a certain height so that there is almost no volume shrinkage difference and plate thickness change caused by cooling and solidification of the thin portion 122.

次に、上記射出成形金型１によって成形された成形品であるインパネ１００を説明する。
インパネ１００は、異なる組成からなる第１材料ｍ１および第２材料ｍ２を射出成形金型１内に射出して接触させることにより、第１材料ｍ１と第２材料ｍ２とを一体成型した成形品である。
インパネ１００は、第１成形部１１０と第２成形部１２０とから構成される。 Next, the instrument panel 100 that is a molded product molded by the injection mold 1 will be described.
The instrument panel 100 is a molded product in which the first material m1 and the second material m2 are integrally molded by injecting and contacting the first material m1 and the second material m2 having different compositions into the injection mold 1. is there.
The instrument panel 100 includes a first molding part 110 and a second molding part 120.

第１成形部１１０は、上型２と第１下型３および可動コア型５との間の第１キャビティ部６ａにて第１材料ｍ１によって成形される。第１成形部１１０は、厚板部１１１と薄肉部１１２とからなる。   The first molding part 110 is molded by the first material m1 in the first cavity part 6a between the upper mold 2, the first lower mold 3, and the movable core mold 5. The first molding part 110 includes a thick plate part 111 and a thin part 112.

第１成形部１１０の厚板部１１１は、上型２と第１下型３との間にて、一定の板厚に成形される。   The thick plate portion 111 of the first forming unit 110 is formed to have a constant plate thickness between the upper mold 2 and the first lower mold 3.

第１成形部１１０の薄肉部１１２は、上型２と可動コア型５との間にて、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２に連続する上流側の厚板部１１１に比して板厚が薄い。
第１成形部１１０の薄肉部１１２は、徐径部１１２ａおよび薄板部１１２ｂを有する。 The thin portion 112 of the first molding portion 110 is located between the upper mold 2 and the movable core die 5, and the upstream thick plate portion 111 continuous with the thin portion 112 joined to the second material m <b> 2 in the first material m <b> 1. The plate thickness is thinner than
The thin part 112 of the 1st shaping | molding part 110 has the slow diameter part 112a and the thin plate part 112b.

第１成形部１１０の徐径部１１２ａは、下面を傾斜させることで、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２に連続する上流側の厚板部１１１に比して板厚が薄い。徐径部１１２ａは、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２の厚みが下流側端に向かうほど薄くなる。徐径部１１２ａは、薄肉部１１２の冷却固化に伴って生じる体積収縮差が板厚変化と共に下流側端に向かうほど低下するように徐々に変化する。   The diameter-reduced portion 112a of the first molded portion 110 is thicker than the thick plate portion 111 on the upstream side continuous with the thin portion 112 joined to the second material m2 in the first material m1 by inclining the lower surface. Is thin. The reduced-diameter portion 112a becomes thinner as the thickness of the thin portion 112 joined to the second material m2 in the first material m1 becomes closer to the downstream end. The reduced-diameter portion 112a gradually changes so that the volume shrinkage difference caused by the cooling and solidification of the thin-walled portion 112 decreases as the plate thickness changes toward the downstream end.

第１成形部１１０の薄板部１１２ｂは、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２に連続する上流側の厚板部１１１に比して板厚が薄い。薄板部１１２ｂは、薄板状であり、第１材料ｍ１における第２材料ｍ２と接合する薄肉部１１２の厚みが薄くなる状態が連続する。薄板部１１２ｂは、徐径部１１２ａの下流側端部に連結され、約５ｍｍの所定長さ、好ましくは１ｍｍの長さを有する。薄板部１１２ｂは、厚板部１１１に対して３分の１程度の厚みである。   The thin plate portion 112b of the first molding portion 110 has a smaller thickness than the upstream thick plate portion 111 continuous with the thin portion 112 joined to the second material m2 in the first material m1. The thin plate portion 112b has a thin plate shape, and the state in which the thickness of the thin portion 112 joined to the second material m2 in the first material m1 is reduced continues. The thin plate portion 112b is connected to the downstream end portion of the reduced diameter portion 112a and has a predetermined length of about 5 mm, preferably 1 mm. The thin plate portion 112b is about one third of the thickness of the thick plate portion 111.

第２成形部１２０は、上型２と第２下型４および可動コア型５との間の第２キャビティ部６ｂにて第２材料ｍ２によって成形される。第２成形部１２０は、厚板部１２１と薄肉部１２２とからなる。   The second molding part 120 is molded by the second material m2 in the second cavity part 6b between the upper mold 2, the second lower mold 4, and the movable core mold 5. The second molding part 120 includes a thick plate part 121 and a thin part 122.

第２成形部１２０の厚板部１２１は、上型２と第２下型４との間にて、一定の板厚に成形される。厚板部１２１は、第１成形部１１０の厚板部１１１と同程度の厚みである。   The thick plate portion 121 of the second forming portion 120 is formed to a constant plate thickness between the upper mold 2 and the second lower mold 4. The thick plate portion 121 has the same thickness as the thick plate portion 111 of the first molding unit 110.

第２成形部１２０の薄肉部１２２は、上型２の下面２１の突状部２２および突状部２２に連続する第１材料ｍ１の薄肉部１１２と可動コア型５との間にて、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２に連続する上流側の厚板部１２１に比して板厚が薄い。
第２成形部１２０の薄肉部１２２は、薄板部１２２ａおよび傾斜先端部１２２ｂを有する。 The thin portion 122 of the second molding portion 120 is formed between the projecting portion 22 of the lower surface 21 of the upper mold 2 and the thin portion 112 of the first material m1 continuous to the projecting portion 22 and the movable core mold 5. The plate thickness is smaller than the thick plate portion 121 on the upstream side continuous to the thin portion 122 joined to the first material m1 in the two materials m2.
The thin part 122 of the 2nd shaping | molding part 120 has the thin-plate part 122a and the inclination front-end | tip part 122b.

第２成形部１２０の薄板部１２２ａは、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２に連続する上流側の厚板部１２１に比して板厚が薄い。薄板部１２２ａは、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２の厚みが一定になる状態が連続する。   The thin plate portion 122a of the second molded portion 120 is thinner than the thick plate portion 121 on the upstream side continuous with the thin portion 122 joined to the first material m1 in the second material m2. In the thin plate portion 122a, the state in which the thickness of the thin portion 122 joined to the first material m1 in the second material m2 is constant continues.

第２成形部１２０の傾斜先端部１２２ｂは、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２に連続する上流側の厚板部１２１に比して板厚が薄い。傾斜先端部１２２ｂは、第２材料ｍ２における第１材料ｍ１と接合する薄肉部１２２が下方に傾斜する先端となる。傾斜先端部１２２ｂは、一定の厚みを有し、薄肉部１２２の冷却固化に伴って生じる体積収縮差および板厚変化がほとんどない。   The inclined tip portion 122b of the second molding portion 120 is thinner than the thick plate portion 121 on the upstream side continuous with the thin portion 122 joined to the first material m1 in the second material m2. The inclined front end portion 122b is a front end where the thin portion 122 joined to the first material m1 in the second material m2 is inclined downward. The inclined tip portion 122b has a constant thickness, and there is almost no volume shrinkage difference and plate thickness change caused by cooling and solidification of the thin portion 122.

図３は、本実施形態に係る射出成形の工程群のタイムチャートを示す図である。図４は、本実施形態に係る射出成形の工程群を説明する図であり、（ａ）が第１材料充填工程Ｓ１を示し、（ｂ）が第１材料保圧工程Ｓ２を示し、（ｃ）が第１材料保圧工程かつ第２材料充填工程Ｓ３を示し、（ｄ）が第１材料保圧工程かつ第２材料保圧工程Ｓ４を示し、（ｅ）が第１材料冷却工程かつ第２材料保圧工程Ｓ５を示し、（ｆ）が第１材料冷却工程かつ第２材料冷却工程Ｓ６を示す。なお、図４中のＳ１〜Ｓ６は、図３中のＳ１〜Ｓ６に対応している。   FIG. 3 is a diagram showing a time chart of the injection molding process group according to the present embodiment. FIGS. 4A and 4B are diagrams for explaining the injection molding process group according to the present embodiment. FIG. 4A shows the first material filling process S1, FIG. 4B shows the first material pressure holding process S2, and FIG. ) Shows the first material holding step and the second material filling step S3, (d) shows the first material holding step and the second material holding step S4, and (e) shows the first material cooling step and the second material holding step S3. The two-material holding step S5 is shown, and (f) shows the first material cooling step and the second material cooling step S6. Note that S1 to S6 in FIG. 4 correspond to S1 to S6 in FIG.

（第１材料充填工程Ｓ１）
図４の（ａ）に示すように、図３中の第１材料充填工程Ｓ１では、まず、射出成形金型１は、可動コア型５を上方に前進（コアフォワード）させる。可動コア型５は、上面５１の平坦面５１ｂを上型２の下面２１の突状部２２に当接させて停止する。これにより、上型２と第１下型３および可動コア型５との間には、第１キャビティ部６ａが形成される。
その後、射出成形金型１は、第１キャビティ部６ａに図示左側から第１材料ｍ１を射出する。 (First material filling step S1)
As shown in FIG. 4A, in the first material filling step S1 in FIG. 3, first, the injection mold 1 advances the movable core mold 5 upward (core forward). The movable core mold 5 is stopped by bringing the flat surface 51 b of the upper surface 51 into contact with the protruding portion 22 of the lower surface 21 of the upper mold 2. Thereby, a first cavity portion 6 a is formed between the upper die 2, the first lower die 3 and the movable core die 5.
Thereafter, the injection mold 1 injects the first material m1 into the first cavity portion 6a from the left side in the figure.

（第１材料保圧工程Ｓ２）
図４の（ｂ）に示すように、図３中の第１材料保圧工程Ｓ２では、第１材料充填工程Ｓ１完了後、第１キャビティ部６ａに第１材料ｍ１を充填した状態で保圧状態に維持する。その途中で、上型２、第１下型３、可動コア型５の全ての内部に冷却水が循環する。特に、可動コア型５では、ＢａＣｕなどの高い熱伝導率を有する部材を用い、内部に冷却水が循環することにより、インパネ１００の第１成形部１１０の薄肉部１１２が熱を可動コア型５の上面５１に伝熱でき、薄肉部１１２が早期に冷却固化される。これにより、第１材料ｍ１における第２材料ｍ２との接合部である薄肉部１１２の冷却を、薄肉部１１２に連続する上流側の厚板部１１１に比して早める。そして、第１成形部１１０の薄肉部１１２が１次収縮する。 (First material pressure holding step S2)
As shown in FIG. 4 (b), in the first material pressure-holding step S2 in FIG. 3, after the first material filling step S1, the first material m1 is filled in the first cavity portion 6a. Maintain state. On the way, cooling water circulates in all of the upper mold 2, the first lower mold 3, and the movable core mold 5. In particular, in the movable core mold 5, a member having high thermal conductivity such as BaCu is used, and the cooling water circulates therein, so that the thin-walled portion 112 of the first molding part 110 of the instrument panel 100 generates heat. Heat can be transferred to the upper surface 51, and the thin portion 112 is cooled and solidified at an early stage. Thereby, cooling of the thin part 112 which is a junction part with the 2nd material m2 in the 1st material m1 is accelerated compared with the upstream thick board part 111 which continues to the thin part 112. And the thin part 112 of the 1st shaping | molding part 110 shrinks primarily.

（第１材料保圧工程かつ第２材料充填工程Ｓ３）
図４の（ｃ）に示すように、図３中の第１材料保圧工程かつ第２材料充填工程Ｓ３では、薄肉部１１２および厚板部１１１の表面部分の冷却固化が進むと、薄肉部１１２の内層が溶融状態であっても、射出成形金型１は、可動コア型５を下方に後退（コアバック）させる。これにより、上型２と第２下型４および可動コア型５との間には、第２キャビティ部６ｂが形成される。第２キャビティ部６ｂには、第１材料ｍ１の薄肉部１１２が露出する。
その後、射出成形金型１は、第２キャビティ部６ｂに図示右側から第２材料ｍ２を射出する。このとき、第１キャビティ部６ａに第１材料ｍ１を充填した状態で保圧状態に維持する。 (First material pressure holding step and second material filling step S3)
As shown in FIG. 4C, in the first material pressure holding step and the second material filling step S3 in FIG. 3, when the cooling and solidification of the surface portions of the thin portion 112 and the thick plate portion 111 proceeds, the thin portion Even when the inner layer 112 is in a molten state, the injection mold 1 moves the movable core mold 5 backward (core back). As a result, a second cavity portion 6 b is formed between the upper die 2, the second lower die 4 and the movable core die 5. The thin portion 112 of the first material m1 is exposed in the second cavity portion 6b.
Thereafter, the injection mold 1 injects the second material m2 into the second cavity portion 6b from the right side in the figure. At this time, the first cavity portion 6a is maintained in a pressure-holding state with the first material m1 being filled.

（第１材料保圧工程かつ第２材料保圧工程Ｓ４）
図４の（ｄ）に示すように、図３中の第１材料保圧工程かつ第２材料保圧工程Ｓ４では、第２材料充填工程Ｓ３完了後、第２キャビティ部６ｂに第２材料ｍ２を充填した状態で保圧状態に維持する。このとき、同様に、第１キャビティ部６ａに第１材料ｍ１を充填した状態で保圧状態に維持する。第１材料ｍ１の薄肉部１１２は、第２材料ｍ２に接触した時点で再度溶融し、その後冷却固化される。 (First material pressure-holding step and second material pressure-holding step S4)
As shown in FIG. 4D, in the first material holding step and the second material holding step S4 in FIG. 3, after the second material filling step S3 is completed, the second material m2 is placed in the second cavity portion 6b. The pressure-holding state is maintained in a state filled with At this time, similarly, the first cavity portion 6a is maintained in the pressure-holding state with the first material m1 being filled therein. The thin portion 112 of the first material m1 is melted again when it contacts the second material m2, and then cooled and solidified.

（第１材料冷却工程かつ第２材料保圧工程Ｓ５）
図４の（ｅ）に示すように、図３中の第１材料冷却工程かつ第２材料保圧工程Ｓ５では、上型２、第１下型３、可動コア型５の全ての内部に冷却水が循環することにより、第１キャビティ部６ａにて第１成形部１１０に成形される第１材料ｍ１の冷却が実行される。このとき、第２キャビティ部６ｂに第２材料ｍ２を充填した状態で保圧状態に維持する。ここでも、可動コア型５では、ＢａＣｕなどの高い熱伝導率を有する部材を用い、内部に冷却水が循環することにより、インパネ１００の第２成形部１２０の薄肉部１２２が熱を可動コア型５の上面５１に伝熱でき、薄肉部１２２が早期に冷却固化される。 (First material cooling step and second material pressure holding step S5)
As shown in FIG. 4E, in the first material cooling step and the second material pressure holding step S5 in FIG. 3, all of the upper die 2, the first lower die 3, and the movable core die 5 are cooled. As the water circulates, cooling of the first material m1 molded into the first molding unit 110 in the first cavity 6a is performed. At this time, the second cavity portion 6b is maintained in a pressure holding state with the second material m2 filled. Here again, in the movable core mold 5, a member having a high thermal conductivity such as BaCu is used, and the cooling water circulates in the interior, whereby the thin-walled portion 122 of the second molding part 120 of the instrument panel 100 radiates heat. 5 can transfer heat to the upper surface 51, and the thin portion 122 is cooled and solidified at an early stage.

（第１材料冷却工程かつ第２材料冷却工程Ｓ６）
図４の（ｆ）に示すように、図３中の第１材料冷却工程かつ第２材料冷却工程Ｓ６では、上型２、第１下型３、可動コア型５の全ての内部に冷却水が循環することにより、第１キャビティ部６ａにて第１成形部１１０に成形される第１材料ｍ１の冷却が実行される。また、図４の（ｅ）の状態から所定間隔を空けて、上型２、第２下型４、可動コア型５の全ての内部に冷却水が循環することにより、第２キャビティ部６ｂにて第２成形部１２０に成形される第２材料ｍ２の冷却が実行される。
そして、第１キャビティ部６ａにて成形される第１成形部１１０の冷却が所定時間完了すると、第１材料ｍ１から構成される第１成形部１１０の成形が完了し、第２キャビティ部６ｂにて成形される第２成形部１２０の冷却を所定時間待つ。
その後、第２材料ｍ２から構成される第２成形部１２０の成形が完了すると、異なる組成からなる第１材料ｍ１および第２材料ｍ２を射出成形金型１内に射出して接触させることにより、第１材料ｍ１と第２材料ｍ２とを一体成型したインパネ１００の成形が完了する。 (First material cooling step and second material cooling step S6)
As shown in FIG. 4 (f), in the first material cooling step and the second material cooling step S6 in FIG. 3, cooling water is contained in all of the upper die 2, the first lower die 3, and the movable core die 5. Circulates, cooling of the first material m1 molded into the first molding unit 110 in the first cavity portion 6a is performed. Also, cooling water circulates in all of the upper mold 2, the second lower mold 4, and the movable core mold 5 at a predetermined interval from the state of FIG. Then, cooling of the second material m2 molded in the second molding unit 120 is performed.
Then, when the cooling of the first molding part 110 molded in the first cavity part 6a is completed for a predetermined time, the molding of the first molding part 110 composed of the first material m1 is completed, and the second cavity part 6b The second molding part 120 to be molded is waited for a predetermined time for cooling.
Thereafter, when the molding of the second molding part 120 composed of the second material m2 is completed, the first material m1 and the second material m2 having different compositions are injected into the injection mold 1 and brought into contact with each other. Molding of the instrument panel 100 in which the first material m1 and the second material m2 are integrally molded is completed.

本実施形態によれば、以下の効果を奏する。   According to this embodiment, the following effects can be obtained.

（１）本実施形態によれば、第１材料ｍ１における第２材料ｍ２との薄肉部１１２の冷却を、薄肉部１１２に連続する上流側の厚板部１１１に比して早める。これにより、第２材料ｍ２を射出させる前に、第１材料ｍ１における第２材料ｍ２との薄肉部１１２の冷却固化が促進できる。このように薄肉部１１２近傍の固化が短時間で済むことにより、第１材料ｍ１が第２材料ｍ２を充填すべき空間（第２キャビティ部６ｂ）に流入せず、第２材料ｍ２の射出タイミングが早まる。よって、第１材料ｍ１の成形工程と第２材料ｍ２の成形工程との期間が一部重複できる。その結果、第１材料ｍ１と第２材料ｍ２とを一体成型する射出成形時のサイクルタイムを短縮することができる。   (1) According to the present embodiment, the cooling of the thin portion 112 with the second material m2 in the first material m1 is accelerated compared to the upstream thick plate portion 111 continuous with the thin portion 112. Thereby, before injecting the 2nd material m2, the cooling solidification of the thin part 112 with the 2nd material m2 in the 1st material m1 can be accelerated | stimulated. Thus, since the solidification of the vicinity of the thin portion 112 is completed in a short time, the first material m1 does not flow into the space (second cavity portion 6b) to be filled with the second material m2, and the injection timing of the second material m2 Accelerates. Therefore, the period of the molding process of the first material m1 and the molding process of the second material m2 can partially overlap. As a result, the cycle time at the time of injection molding for integrally molding the first material m1 and the second material m2 can be shortened.

（２）本実施形態によれば、第１材料ｍ１における第２材料ｍ２との薄肉部１１２を、薄肉部１１２に連続する上流側の厚板部１１１に比して板厚を薄くする。これにより、第１材料ｍ１における第２材料ｍ２との薄肉部１１２の冷却を、薄肉部１１２に連続する上流側の厚板部１１１に比して早められる。   (2) According to the present embodiment, the thin portion 112 of the first material m1 with the second material m2 is made thinner than the thick plate portion 111 on the upstream side continuous with the thin portion 112. Thereby, cooling of the thin part 112 with the 2nd material m2 in the 1st material m1 is advanced compared with the upstream thick board part 111 which continues to the thin part 112. FIG.

（３）本実施形態によれば、第１材料ｍ１における第２材料ｍ２との薄肉部１１２の冷却固化に伴って生じる体積収縮差を、下流側端に向けて徐々に変化させる。これにより、薄肉部１１２の冷却固化に伴って生じる体積収縮差が下流側端に向かうほど低下するように徐々に変化できる。そのため、薄肉部１１２近傍にて大きな体積収縮差が発生せず、製品意匠面Ａにおける歪み（デフォーム）の発生が抑制できる。   (3) According to the present embodiment, the volume shrinkage difference caused by cooling and solidifying the thin portion 112 of the first material m1 with the second material m2 is gradually changed toward the downstream end. Thereby, it can change gradually so that the volume shrinkage difference which arises with the cooling solidification of the thin part 112 may fall, so that it goes to a downstream end. Therefore, a large volume shrinkage difference does not occur in the vicinity of the thin portion 112, and the occurrence of distortion (deformation) in the product design surface A can be suppressed.

（４）本実施形態によれば、第１材料ｍ１における第２材料ｍ２との薄肉部１１２の厚みを、下流側端に向けて徐々に変化させる。これにより、第１材料ｍ１における第２材料ｍ２との薄肉部１１２の厚みが下流側端に向かうほど薄くなるように徐々に変化できる。そのため、薄肉部１１２の冷却固化に伴って生じる体積収縮差が板厚変化と共に下流側端に向かうほど低下するように徐々に変化できる。その結果、インパネ１００が簡素な構成であっても、薄肉部１１２近傍にて大きな板厚変化および体積収縮差が発生せず、製品意匠面Ａにおける歪み（デフォーム）の発生が抑制できる。   (4) According to this embodiment, the thickness of the thin portion 112 of the first material m1 with the second material m2 is gradually changed toward the downstream end. Thereby, it can change gradually so that the thickness of the thin part 112 with the 2nd material m2 in the 1st material m1 may become so thin that it goes to a downstream end. Therefore, the volume shrinkage difference caused by the cooling and solidification of the thin portion 112 can be gradually changed so as to decrease toward the downstream end along with the plate thickness change. As a result, even if the instrument panel 100 has a simple configuration, a large plate thickness change and volume shrinkage difference do not occur in the vicinity of the thin portion 112, and the occurrence of distortion (deformation) on the product design surface A can be suppressed.

（５）本実施形態によれば、可動コア型５を薄肉部１１２に接触する部分以外の部位に比して高い熱伝導率を有する部材に構成する。これにより、第２材料ｍ２を射出させる前に、薄肉部１１２は熱を可動コア型５の少なくとも薄肉部１１２との接触部である上面５１に伝熱できる。そのため、第１材料ｍ１における第２材料ｍ２との接合部である薄肉部１１２の冷却固化がより促進できる。   (5) According to the present embodiment, the movable core mold 5 is configured as a member having a high thermal conductivity as compared to a portion other than the portion that contacts the thin portion 112. Thereby, before injecting the 2nd material m2, the thin part 112 can transfer a heat | fever to the upper surface 51 which is a contact part with the thin part 112 of the movable core type | mold 5 at least. Therefore, cooling solidification of the thin part 112 which is a joint part with the 2nd material m2 in the 1st material m1 can be accelerated | stimulated more.

なお、本発明は上記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれる。   It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

１…射出成形金型
５…可動コア型（仕切り部材）
６ａ…第１キャビティ部
６ｂ…第２キャビティ部
１００…インパネ（成形品）
１１２…薄肉部（接合部）
ｍ１…第１材料
ｍ２…第２材料 DESCRIPTION OF SYMBOLS 1 ... Injection molding die 5 ... Movable core type | mold (partition member)
6a ... 1st cavity part 6b ... 2nd cavity part 100 ... Instrument panel (molded article)
112 ... Thin part (joint part)
m1 ... 1st material m2 ... 2nd material

Claims (7)

異なる組成からなる第１材料および第２材料を金型内に射出して接触させることにより、前記第１材料と前記第２材料とを一体成型する射出成形方法であって、
前記第１材料における前記第２材料との接合部の冷却を、前記接合部に連続する上流側に比して早めることを特徴とする射出成形方法。 An injection molding method of integrally molding the first material and the second material by injecting and contacting a first material and a second material having different compositions into a mold,
An injection molding method characterized in that the cooling of the joint portion of the first material with the second material is accelerated compared to the upstream side continuous with the joint portion. 前記第１材料における前記第２材料との前記接合部を、前記接合部に連続する上流側に比して板厚を薄くすることを特徴とする請求項１に記載の射出成形方法。   2. The injection molding method according to claim 1, wherein a thickness of the joint portion of the first material with the second material is made thinner than an upstream side continuous with the joint portion. 前記第１材料における前記第２材料との前記接合部の冷却固化に伴って生じる体積収縮差を、下流側端に向けて徐々に変化させることを特徴とする請求項１または２に記載の射出成形方法。   3. The injection according to claim 1, wherein a volume shrinkage difference caused by cooling and solidifying the joint portion of the first material with the second material is gradually changed toward a downstream end. Molding method. 前記第１材料における前記第２材料との前記接合部の厚みを、下流側端に向けて徐々に変化させることを特徴とする請求項１から３のいずれか１項に記載の射出成形方法。   The injection molding method according to any one of claims 1 to 3, wherein a thickness of the joint portion of the first material with the second material is gradually changed toward a downstream end. 第１材料を成形する第１キャビティ部を構成すると共に、前記第１材料の成形後に移動して第２材料を成形する第２キャビティ部を形成する仕切り部材を備え、
前記第１キャビティ部は、前記第１材料における前記第２材料との接合部を、前記接合部に連続する上流側に比して板厚を薄くする薄肉部に形成することを特徴とする射出成形金型。 A partition member that forms a first cavity part for molding the first material and that forms a second cavity part that moves after the molding of the first material to mold the second material;
The first cavity portion is formed by forming a joint portion of the first material with the second material as a thin portion that is thinner than an upstream side continuous with the joint portion. Molding mold. 前記仕切り部材は、少なくとも前記薄肉部との接触部を前記薄肉部以外の部位に比して高い熱伝導率を有する部材にて構成されることを特徴とする請求項５に記載の射出成形金型。   6. The injection molding metal according to claim 5, wherein the partition member is formed of a member having a high thermal conductivity at least at a contact portion with the thin portion as compared with a portion other than the thin portion. Type. 異なる組成からなる第１材料および第２材料を金型内に射出して接触させることにより、前記第１材料と前記第２材料とを一体成型した成形品であって、
前記第１材料における前記第２材料との接合部を、前記接合部に連続する上流側に比して板厚を薄くする薄肉部に形成したことを特徴とする成形品。

A molded product obtained by integrally molding the first material and the second material by injecting and contacting a first material and a second material having different compositions into a mold,
A molded product, wherein a joint portion between the first material and the second material is formed in a thin portion that is thinner than an upstream side continuous with the joint portion.

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