JP5000208B2 - Plastic molded product - Google Patents

Plastic molded product Download PDF

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JP5000208B2
JP5000208B2 JP2006174012A JP2006174012A JP5000208B2 JP 5000208 B2 JP5000208 B2 JP 5000208B2 JP 2006174012 A JP2006174012 A JP 2006174012A JP 2006174012 A JP2006174012 A JP 2006174012A JP 5000208 B2 JP5000208 B2 JP 5000208B2
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molten resin
main body
surface portion
molded product
flow direction
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JP2008001020A (en
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裕介 藤田
弘晃 谷口
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Honda Motor Co Ltd
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Description

本発明は、樹脂成形品に関し、特にその意匠面の外観品質向上に関する。   The present invention relates to a resin molded product, and more particularly to improving the appearance quality of the design surface.

樹脂成形品には、図７に一部を示すように、意匠面１００と裏面１０１とを有する本体部１０２と、この本体部１０２の裏面１０１から突出する突出部１０３とを一体成形してなるものがあるが、このような樹脂成形品を成形する際に、本体部１０２の意匠面１００に、突出部１０３の溶融樹脂の流れ方向に沿う面部１０４の位置から溶融樹脂の流れ方向Ｘに沿って図８に示すような筋状のウェルド１０５が発生することがある。これは、図９に示すように、金型１０６内において、本体部１０２を形成するための本体部形成キャビティ１０７を流れていた溶融樹脂が、突出部１０３の溶融樹脂の流れ方向に沿う面部１０４を形成するための突出部形成キャビティ１０８に矢印Ｅで示すように多く流れ込んだ後、矢印Ｆで示すように本体部１０２を形成するために流れていた溶融樹脂と意匠面１００の近傍の合流点Ｇで交わることに起因して発生するものである。このようなウェルド１０５は、合流点Ｇから溶融樹脂の流れによって下流側に延びるように発生することになり、意匠面１００の外観品質を損なってしまうという問題がある。   As shown in part in FIG. 7, the resin molded product is formed by integrally molding a main body portion 102 having a design surface 100 and a back surface 101 and a protruding portion 103 protruding from the back surface 101 of the main body portion 102. When molding such a resin molded product, the design surface 100 of the main body 102 is formed on the design surface 100 along the flow direction X of the molten resin from the position of the surface portion 104 along the flow direction of the molten resin. Thus, a streak-like weld 105 as shown in FIG. 8 may occur. As shown in FIG. 9, in the mold 106, the molten resin that has flowed through the main body forming cavity 107 for forming the main body 102 is a surface portion 104 along the flow direction of the molten resin of the protrusion 103. After flowing in a large amount as shown by the arrow E into the projecting portion forming cavity 108 for forming the main body portion 102 as shown by the arrow F, the molten resin flowing to form the main body portion 102 and the junction near the design surface 100 It is caused by crossing at G. Such a weld 105 is generated so as to extend downstream from the joining point G due to the flow of the molten resin, and there is a problem that the appearance quality of the design surface 100 is impaired.

このようなウェルドの発生を防止するために、金型に、本体部を形成するためのキャビティへの溶融樹脂の導入用通路であるランナとは別に、突出部を形成するためのキャビティに直接溶融樹脂を導入するランナを設けた技術がある（例えば、特許文献１参照）。
特開２００６−９５９７０号公報 In order to prevent the occurrence of such welds, the mold is melted directly into the cavity for forming the protruding portion separately from the runner which is a passage for introducing the molten resin into the cavity for forming the main body. There is a technique in which a runner for introducing a resin is provided (see, for example, Patent Document 1).
JP 2006-95970 A

しかしながら、突出部を形成するためのキャビティに直接溶融樹脂を導入するランナを金型に設けるのでは、このランナで、後に除去が必要な不要部が形成されてしまうことになり、材料コストおよび製造コストの増大を招いてしまう。   However, if a runner that directly introduces the molten resin into the cavity for forming the protruding portion is provided in the mold, an unnecessary portion that needs to be removed later is formed in this runner, and material costs and manufacturing are reduced. It will increase the cost.

したがって、本発明は、材料コストおよび製造コストの増大を防止しつつ意匠面でのウェルドの発生を抑制できる樹脂成形品の提供を目的とする。   Therefore, an object of the present invention is to provide a resin molded product capable of suppressing the occurrence of welds on the design surface while preventing an increase in material cost and manufacturing cost.

上記目的を達成するために、請求項１に係る発明は、意匠面（例えば実施形態における意匠面１１）と裏面（例えば実施形態における裏面１２）とを有する本体部（例えば実施形態における本体部１５）と該本体部の前記裏面から突出する突出部（例えば実施形態における取付座部１６）とが一体成形される樹脂成型品（例えば実施形態における樹脂成型品１０）であって、前記突出部の、前記本体部における溶融樹脂の流れ方向に沿う面部が、前記本体部に立設される板状の立設面部（例えば実施形態における面部２５）と前記本体部に沿う板状の頂面部（例えば実施形態における頂面部２７）とを有しており、前記突出部には、肉抜き部（例えば実施形態における肉抜き部３５）が、前記立設面部および前記頂面部の両方を連続して貫通し前記頂面部の該頂面部よりも突出する頂面突出部（例えば実施形態における取付円筒状部３０）より手前の中間位置まで形成されていることを特徴としている。 In order to achieve the above object, the invention according to claim 1 is a main body (for example, main body 15 in the embodiment) having a design surface (for example, the design surface 11 in the embodiment) and a back surface (for example, the back surface 12 in the embodiment). ) And a protruding portion (for example, the mounting seat portion 16 in the embodiment) that protrudes from the back surface of the main body portion, is a resin molded product (for example, the resin molded product 10 in the embodiment), The surface portion along the flow direction of the molten resin in the main body portion is a plate-like standing surface portion (for example, the surface portion 25 in the embodiment) erected on the main body portion and a plate-like top surface portion (for example, the surface portion 25 in the embodiment). A top surface portion 27 in the embodiment), and a thinned portion (for example, a thinned portion 35 in the embodiment) passes through both the standing surface portion and the top surface portion in the protruding portion. Is characterized by being formed from to an intermediate position of the front (mounting cylindrical portion 30 in the example embodiment) top surface protrusion which protrudes from said top surface of said top wall.

請求項２に係る発明は、請求項１に係る発明において、前記肉抜き部が前記立設面部および前記頂面部の、前記本体部における溶融樹脂の流れ方向における中間部に形成されていることを特徴としている。 The invention according to claim 2 is that, in the invention according to claim 1, the lightening part is formed in an intermediate part of the standing surface part and the top surface part in the flow direction of the molten resin in the main body part. It is a feature.

請求項３に係る発明は、請求項２に係る発明において、前記肉抜き部が前記立設面部および前記頂面部の、前記本体部における溶融樹脂の流れ方向における上流寄りに形成されていることを特徴としている。 The invention according to claim 3 is the invention according to claim 2, wherein the lightening portion is formed upstream of the standing surface portion and the top surface portion in the flow direction of the molten resin in the main body portion. It is a feature.

請求項４に係る発明は、請求項１乃至３のいずれか一項に係る発明において、前記突出部の前記立設面部および前記頂面部以外の他の面部にも肉抜き部が形成されていることを特徴としている。 According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a lightening portion is formed also in the other surface portion other than the standing surface portion and the top surface portion of the protruding portion. It is characterized by that.

請求項１に係る発明によれば、突出部の溶融樹脂流れ方向に沿う面部に肉抜き部が形成されているため、金型内で、突出部の形成のための突出部形成キャビティ内に、その面部の形成側に沿って入り込む溶融樹脂の流れを抑制することができ、その結果、この溶融樹脂が、本体部を形成するための本体部形成キャビティ内を流れる溶融樹脂に交わるのを抑制することができる。したがって、突出部形成キャビティに直接樹脂を導入するランナを設けなくても意匠面でのウェルドの発生を抑制できるため、材料コストおよび製造コストの増大を防止しつつウェルドの発生を抑制できる。   According to the first aspect of the present invention, since the lightening portion is formed in the surface portion along the molten resin flow direction of the protruding portion, in the mold, in the protruding portion forming cavity for forming the protruding portion, It is possible to suppress the flow of the molten resin entering along the formation side of the surface portion, and as a result, the molten resin is prevented from intersecting with the molten resin flowing in the body portion forming cavity for forming the body portion. be able to. Therefore, since it is possible to suppress the occurrence of welds on the design surface without providing a runner that directly introduces resin into the protrusion forming cavity, it is possible to suppress the occurrence of welds while preventing an increase in material costs and manufacturing costs.

請求項２に係る発明によれば、肉抜き部が面部の溶融樹脂流れ方向における中間部に形成されているため、金型内で、上流側から突出部形成キャビティ内にその面部の形成側に沿って流れ込む溶融樹脂が、本体部形成キャビティ内を流れる溶融樹脂に交わる前に、下流側からこの突出部形成キャビティ内にその面部の形成側に沿って溶融樹脂を流れ込ませることができて、これらの流れを突出部形成キャビティ内で合流させることができる。よって、突出部形成キャビティからの溶融樹脂が、本体部形成キャビティ内を流れる溶融樹脂に交わるのを確実に抑制することができる。しかも、肉抜き部が面部の溶融樹脂流れ方向における中間部に形成されているため、突出部の剛性低下も抑制することができる。   According to the second aspect of the present invention, since the lightening portion is formed at the intermediate portion of the surface portion in the molten resin flow direction, the surface portion is formed in the mold from the upstream side into the protruding portion forming cavity. Before the molten resin flowing along the molten resin flowing in the main body forming cavity, the molten resin can flow into the protruding portion forming cavity from the downstream side along the surface forming side, and these Can be combined in the protrusion forming cavity. Therefore, it is possible to reliably suppress the molten resin from the protruding portion forming cavity from intersecting with the molten resin flowing in the main body portion forming cavity. In addition, since the thinned portion is formed at the intermediate portion in the molten resin flow direction of the surface portion, it is possible to suppress a decrease in rigidity of the protruding portion.

請求項３に係る発明によれば、肉抜き部が面部の溶融樹脂流れ方向における上流寄りに形成されているため、金型内で、上流側から突出部形成キャビティ内にその面部の形成側に沿って流れ込む溶融樹脂よりも、下流側からこの突出部形成キャビティ内にその面部の形成側に沿って流れ込む溶融樹脂の方が流れ込みやすくなり、上流側から突出部形成キャビティ内にその面部の形成側に沿って流れ込む溶融樹脂が、本体部形成キャビティ内を流れる溶融樹脂に交わる前に、下流側から突出部形成キャビティにその面部の形成側に沿って溶融樹脂を確実に流れ込ませることができて、これらの流れを突出部形成キャビティ内で確実に合流させることができる。よって、突出部形成キャビティからの溶融樹脂が、本体部形成キャビティ内を流れる溶融樹脂に交わるのを一層確実に抑制することができる。   According to the invention of claim 3, since the thinned portion is formed on the upstream side in the molten resin flow direction of the surface portion, in the mold, from the upstream side to the projecting portion forming cavity, on the formation side of the surface portion. The molten resin flowing along the surface forming side from the downstream side into the protruding portion forming cavity is more likely to flow into the protruding portion forming cavity from the upstream side than the molten resin flowing in along the protruding portion forming cavity. Before the molten resin flowing along the molten resin flowing in the main body forming cavity, the molten resin can surely flow from the downstream side into the protruding portion forming cavity along the surface forming side, These flows can be reliably merged in the protrusion forming cavity. Therefore, it can suppress more reliably that the molten resin from the protrusion part formation cavity intersects with the molten resin which flows through the inside of the main body part formation cavity.

請求項４に係る発明によれば、突出部の面部以外の他の面部にも肉抜き部が形成されているため、溶融樹脂の流れを妨げにくくなり、ウェルドの発生をより確実に抑制することができる。   According to the invention which concerns on Claim 4, since the lightening part is formed also in other surface parts other than the surface part of a protrusion part, it becomes difficult to prevent the flow of molten resin, and suppresses generation | occurrence | production of a weld more reliably. Can do.

本発明の一実施形態の樹脂成形品を主に図１〜図５を参照して以下に説明する。
図１は、本実施形態の樹脂成形品１０の全体構成を示すものであり、この樹脂成形品１０は、車両の車室内に取り付けられる内装材である。図１において見えている表面が車室内に露出する意匠面１１であり、図１において見えていない裏面１２が車室外側に配置される。 The resin molded article of an embodiment of the present invention mainly with reference to FIGS. 5 will be described below.
FIG. 1 shows an overall configuration of a resin molded product 10 of the present embodiment, and this resin molded product 10 is an interior material that is attached to a vehicle interior of a vehicle. The front surface visible in FIG. 1 is the design surface 11 exposed in the vehicle interior, and the back surface 12 not visible in FIG. 1 is disposed outside the vehicle interior.

樹脂成形品１０は、表面が意匠面１１とされて面板状に広がる本体部１５と、この本体部１５の意匠面１１とは反対の裏面１２から突出する複数の取付座部（突出部）１６とを有する形状に一体成形されており、これらの取付座部１６において図示略の車体側の取付ベース部材に取り付けられる。ここで、本体部１５は、面板状に広がる主板状部１８と、主板状部１８の周縁部から部分的に裏面１２側に折れ曲がって若干延出する図２に示す周縁壁部１９とからなっている。   The resin molded product 10 includes a body portion 15 whose surface is a design surface 11 and spreads in a face plate shape, and a plurality of mounting seats (projection portions) 16 projecting from a back surface 12 opposite to the design surface 11 of the body portion 15. And is attached to a mounting base member on the vehicle body side (not shown) at these mounting seats 16. Here, the main body 15 includes a main plate-shaped portion 18 that spreads in a face plate shape, and a peripheral wall portion 19 shown in FIG. 2 that is partially bent from the peripheral edge of the main plate-shaped portion 18 to the back surface 12 side and slightly extends. ing.

この樹脂成形品１０は、一方向に長い形状をなしており、図１に二点鎖線で示す金型２０内に形成された、この樹脂成形品１０の外観形状と相補形状をなすキャビティ２１に溶融樹脂が射出成形されることで形成される。ここで、金型２０にはキャビティ２１の長さ方向の中間位置に長さ方向に直交する方向から溶融樹脂を射出するゲート部２２が設けられており、ゲート部２２からキャビティ２１内に射出された溶融樹脂は、図１に一点鎖線矢印でイメージを示すように、主に、長さ方向の中間部の幅方向の一側から幅方向の他側に向かう流れ（矢印Ｘ１）と、長さ方向の中間部から長さ方向の一端部の方向に向かう流れ（矢印Ｘ２）と、長さ方向の中間部から長さ方向の他端部の方向に向かう流れ（矢印Ｘ３）を主体としてキャビティ内で広がる。   This resin molded product 10 has a shape that is long in one direction, and is formed in a cavity 21 that is formed in a mold 20 shown by a two-dot chain line in FIG. It is formed by injection molding of molten resin. Here, the mold 20 is provided with a gate portion 22 for injecting a molten resin from a direction orthogonal to the length direction at an intermediate position in the length direction of the cavity 21, and is injected into the cavity 21 from the gate portion 22. The molten resin mainly has a flow (arrow X1) from the one side in the width direction to the other side in the width direction (arrow X1) and the length as shown by the dashed line arrow in FIG. In the cavity, mainly the flow from the middle part of the direction toward the one end in the length direction (arrow X2) and the flow from the middle part in the length direction to the other end in the length direction (arrow X3) Spread with.

樹脂成形品１０の取付座部１６は、図２に示す形状をなしている。ここで、図２は、複数の取付座部１６のうち、本体部１５の裏面１２側に折り曲げられた周縁壁部１９の近傍に形成されたものを示している。この取付座部１６は、周縁壁部１９よりも内側において矢印Ｘで示す溶融樹脂の流れ方向（樹脂成形品１０の中間部から端部への方向。以下、流れ方向Ｘと言う。）に沿って本体部１５の主板状部１８から略垂直に立設される板状の面部２５と、この面部２５の流れ方向の下流側の端縁部と周縁壁部１９とを流れ方向Ｘに略直交するように結ぶ板状の下流側面部（他の面部）２６と、流れ方向Ｘに沿い且つ主板状部１８と略平行をなす状態で面部２５の上縁部と下流側面部２６の上縁部と周縁壁部１９とを結ぶ板状の頂面部２７とが形成されている。なお、取付座部１６の流れ方向Ｘの上流側には面部は設けられておらず、開口する形状をなしている。   The mounting seat 16 of the resin molded product 10 has a shape shown in FIG. Here, FIG. 2 shows a plurality of mounting seats 16 formed in the vicinity of the peripheral wall 19 that is bent toward the back surface 12 of the main body 15. The mounting seat portion 16 is along the flow direction of the molten resin indicated by an arrow X on the inner side of the peripheral wall portion 19 (direction from the intermediate portion to the end portion of the resin molded product 10; hereinafter referred to as the flow direction X). The plate-like surface portion 25 erected substantially perpendicularly from the main plate-like portion 18 of the main body portion 15, the downstream edge portion of the surface portion 25 in the flow direction, and the peripheral wall portion 19 are substantially orthogonal to the flow direction X. A plate-like downstream side surface portion (other surface portion) 26, and an upper edge portion of the surface portion 25 along the flow direction X and substantially parallel to the main plate-like portion 18, and an upper edge portion of the downstream side surface portion 26. A plate-like top surface portion 27 that connects the peripheral wall portion 19 and the peripheral wall portion 19 is formed. In addition, the surface part is not provided in the upstream of the flow direction X of the attachment seat part 16, and has comprised the shape which opens.

また、この取付座部１６の頂面部２７には、その略中央位置から主板状部１８とは反対方向に延出する略円筒状の取付円筒状部３０と、この取付円筒状部３０の基端側から流れ方向Ｘに沿って下流側に延出するリブ３１と、この取付円筒状部３０の基端側から流れ方向Ｘに沿って上流側に延出するリブ３２と、この取付円筒状部３０の基端側から流れ方向Ｘに直交して周縁壁部１９まで延出するリブ３３とを有している。取付座部１６は、取付円筒状部３０が図示略の取付ベース部材の穴部に挿入された後、内周側に樹脂製のピン等が嵌合されることで取付ベース部材に取り付けられる。   Further, the top surface portion 27 of the mounting seat portion 16 includes a substantially cylindrical mounting cylindrical portion 30 extending in a direction opposite to the main plate-shaped portion 18 from a substantially central position thereof, and a base of the mounting cylindrical portion 30. A rib 31 extending downstream from the end side along the flow direction X, a rib 32 extending upstream from the base end side of the mounting cylindrical portion 30 along the flow direction X, and the mounting cylindrical shape A rib 33 extending from the base end side of the portion 30 to the peripheral wall portion 19 at right angles to the flow direction X. The mounting seat portion 16 is attached to the mounting base member by fitting a resin pin or the like on the inner peripheral side after the mounting cylindrical portion 30 is inserted into a hole portion of the mounting base member (not shown).

そして、本実施形態においては、取付座部１６の流れ方向Ｘに沿う面部２５に肉抜き部３５が形成されている。この肉抜き部３５は、面部２５の流れ方向Ｘにおける中間部、具体的には中央部に形成されており、面部２５を厚さ方向に貫通している。より具体的に、肉抜き部３５は、本体部１５の裏面１２の位置から頂面部２７側に、流れ方向Ｘに一定の幅および位置で形成され、頂面部２７の取付円筒状部３０より手前の中間位置まで連続して形成されている。   In the present embodiment, the lightening portion 35 is formed on the surface portion 25 along the flow direction X of the mounting seat portion 16. The thinned portion 35 is formed at an intermediate portion in the flow direction X of the surface portion 25, specifically, at the center portion, and penetrates the surface portion 25 in the thickness direction. More specifically, the thinned portion 35 is formed from the position of the back surface 12 of the main body portion 15 to the top surface portion 27 side with a certain width and position in the flow direction X, and before the mounting cylindrical portion 30 of the top surface portion 27. Are formed continuously up to the middle position.

また、本実施形態においては、取付座部１６の面部２５以外の他の下流側面部２６にも肉抜き部３６が形成されている。この肉抜き部３６は、下流側面部２６の流れ方向Ｘに直交し且つ主板状部１８に沿う方向における中間部、具体的には中央部に形成されており、下流側面部２６を厚さ方向に貫通している。より具体的に、肉抜き部３６は、本体部１５の裏面１２の位置から頂面部２７側に、流れ方向Ｘに直交し且つ主板状部１８に沿う方向に一定の幅および位置で形成され、下流側面部２６の下部にのみ形成されている。   In the present embodiment, the lightening portion 36 is also formed in the downstream side surface portion 26 other than the surface portion 25 of the mounting seat portion 16. The thinned portion 36 is formed in an intermediate portion, specifically, a central portion in a direction perpendicular to the flow direction X of the downstream side surface portion 26 and along the main plate portion 18, and the downstream side surface portion 26 is formed in the thickness direction. Has penetrated. More specifically, the thinned portion 36 is formed from the position of the back surface 12 of the main body portion 15 to the top surface portion 27 side with a constant width and position in a direction perpendicular to the flow direction X and along the main plate-shaped portion 18. It is formed only at the lower portion of the downstream side surface portion 26.

なお、他の取付座部１６についても同様の構造となっている。但し、本体部１５の周縁壁部１９に近接して形成されていない取付座部１６は、面部２５と同様の面部が面部２５とは反対側に形成されることになり、この面部にも肉抜き部が形成されることになる。   The other mounting seats 16 have the same structure. However, the mounting seat portion 16 that is not formed in the vicinity of the peripheral wall portion 19 of the main body portion 15 is formed with a surface portion similar to the surface portion 25 on the side opposite to the surface portion 25, and this surface portion also has a wall. A punched portion is formed.

図３に示すように、金型２０のキャビティ２１は、本体部１５を形成するため本体部１５と相補形状をなす本体部形成キャビティ４０と、取付座部１６を形成するため取付座部１６と相補形状をなす取付座部形成キャビティ４１とを有している。ここで、取付座部形成キャビティ４１を形成するためにスライド型や中子が用いられる。例えば、図４に示すように、取付座部１６の外側を形成するための凹部４３（図示の便宜上、取付円筒状部３０およびリブ３１〜３３を形成するための部分は略している）が形成された上型４４と、この上型４４内で凹部４３内に突出するように流れ方向Ｘに沿ってスライドするとともに、面部２５の内面を形成する形成部４５と、周縁壁部１９の内面を形成する形成部４６と、主板状部１８の裏面１２を形成する形成部４７と、下流側壁部２６の内面を形成する形成部４８と、下流側壁部２６の肉抜き部３６を形成する形成部４９とを有するスライド型５０とが用いられる。上型４４には、凹部４３の流れ方向Ｘに沿う側面から流れ方向Ｘに直交する方向に突出して肉抜き部３５を形成する形成部５２が形成されている。なお、図３に示すように、上型４４に合わせられる下型５５には、主板状部１８を形成するための凹部５６が形成されている。   As shown in FIG. 3, the cavity 21 of the mold 20 includes a body portion forming cavity 40 that is complementary to the body portion 15 to form the body portion 15, and a mounting seat portion 16 to form the mounting seat portion 16. A mounting seat forming cavity 41 having a complementary shape is provided. Here, a slide mold or a core is used to form the attachment seat portion forming cavity 41. For example, as shown in FIG. 4, a concave portion 43 for forming the outside of the mounting seat portion 16 (for convenience of illustration, the portions for forming the mounting cylindrical portion 30 and the ribs 31 to 33 are omitted). The formed upper die 44, slides along the flow direction X so as to protrude into the recess 43 within the upper die 44, and forms the inner surface of the surface portion 25, and the inner surface of the peripheral wall portion 19. A forming part 46 to be formed, a forming part 47 to form the back surface 12 of the main plate-like part 18, a forming part 48 to form the inner surface of the downstream side wall part 26, and a forming part to form the lightening part 36 of the downstream side wall part 26. 49 is used. Formed on the upper mold 44 is a forming portion 52 that protrudes in a direction orthogonal to the flow direction X from the side surface along the flow direction X of the recess 43 to form the thinned portion 35. As shown in FIG. 3, a recess 56 for forming the main plate portion 18 is formed in the lower die 55 that is matched with the upper die 44.

そして、本実施形態においては、上記のように、金型２０のゲート部２２からキャビティ２１内に溶融樹脂を射出することで本体部１５および複数の取付座部１６とを有する樹脂成形品１０が一体成形されることになる。このとき、溶融樹脂は下型５５の凹部５６と上型４４とで形成された本体部１５を形成するための本体部形成キャビティ４０内で主体的に流れることになり、その主体的流れから分流するように、上型４４とスライド型５０とで形成された取付座部形成キャビティ４１内に入り込むことになる。ここで、取付座部１６の流れ方向Ｘに沿う面部２５の流れ方向Ｘの中間部、具体的には中央部に肉抜き部３５が形成されているため、上流側から取付座部形成キャビティ４１内に、凹部４３と形成部５２との間の上流側の流路５８を介して、その面部２５の形成側に沿って流れ込む溶融樹脂（矢印Ａ）が、本体部形成キャビティ４０内を流れる溶融樹脂（矢印Ｂ）に交わる前に、下流側からこの取付座部形成キャビティ４１内に、凹部４３と形成部５２との間の下流側の流路５９を介して、その面部２５の形成側に沿って溶融樹脂（矢印Ｃ）を流れ込ませることができて、これらの流れを取付座部形成キャビティ４１内で合流させることができる（合流点Ｄ）。よって、取付座部形成キャビティ４１からの溶融樹脂が、本体部形成キャビティ４０内を流れる溶融樹脂に交わるのを確実に抑制することができる。したがって、取付座部形成キャビティ４１に直接樹脂を導入するランナを設けなくても意匠面１１でのウェルドの発生を抑制できるため（図５および図８参照）、材料コストおよび製造コストの増大を防止しつつウェルドの発生を抑制できる。しかも、肉抜き部３５が面部２５の溶融樹脂流れ方向における中間部に形成されているため、取付座部１６の剛性低下も抑制することができる。   And in this embodiment, as mentioned above, the resin molded product 10 which has the main-body part 15 and the some attachment seat part 16 by inject | pouring molten resin in the cavity 21 from the gate part 22 of the metal mold | die 20 is obtained. It will be integrally molded. At this time, the molten resin mainly flows in the main body portion forming cavity 40 for forming the main body portion 15 formed by the concave portion 56 of the lower mold 55 and the upper mold 44, and is divided from the main flow. As described above, the mounting seat portion forming cavity 41 is formed by the upper die 44 and the slide die 50. Here, since the lightening part 35 is formed in the intermediate part of the flow direction X of the surface part 25 along the flow direction X of the attachment seat part 16, specifically, the center part, the attachment seat part formation cavity 41 is formed from the upstream side. The molten resin (arrow A) that flows along the formation side of the surface portion 25 through the upstream flow path 58 between the concave portion 43 and the formation portion 52 flows into the main body formation cavity 40. Before crossing the resin (arrow B), from the downstream side into the mounting seat portion forming cavity 41, through the downstream side flow passage 59 between the concave portion 43 and the forming portion 52, to the formation side of the surface portion 25. The molten resin (arrow C) can be made to flow along, and these flows can be merged in the attachment seat part formation cavity 41 (merge point D). Therefore, it is possible to reliably suppress the molten resin from the mounting seat portion forming cavity 41 from intersecting with the molten resin flowing in the main body portion forming cavity 40. Therefore, since it is possible to suppress the occurrence of welds on the design surface 11 without providing a runner that directly introduces resin into the mounting seat portion forming cavity 41 (see FIGS. 5 and 8), an increase in material cost and manufacturing cost is prevented. However, the occurrence of welds can be suppressed. Moreover, since the thinned portion 35 is formed at the intermediate portion of the surface portion 25 in the molten resin flow direction, the rigidity of the mounting seat portion 16 can be suppressed from being lowered.

加えて、取付座部１６の面部２５以外の他の下流側面部２６にも肉抜き部３６が形成されているため、意匠面１１を含む主板状部１８を形成する溶融樹脂の主体的な流れに対する取付座部１６形成のための分岐面積が少なくなり、その結果、溶融樹脂の主体的な流れを妨げにくくなり、ウェルドの発生をより確実に抑制することができる。   In addition, since the thinned portion 36 is also formed in the downstream side surface portion 26 other than the surface portion 25 of the mounting seat portion 16, the main flow of the molten resin that forms the main plate-shaped portion 18 including the design surface 11. As a result, the branch area for forming the mounting seat portion 16 is reduced, so that the main flow of the molten resin is less likely to be hindered, and the occurrence of welds can be more reliably suppressed.

なお、取付座部１６の流れ方向Ｘに沿う面部２５に肉抜き部３５を形成すれば、流れ方向Ｘの中間部でなくても、金型２０内で、取付座部形成キャビティ２１内に、その面部２５の形成側に沿って入り込む溶融樹脂の流れを抑制することができるため、この溶融樹脂が、本体部１５を形成するための本体部形成キャビティ４０内を流れる溶融樹脂に交わるのを抑制することができて、意匠面１１でのウェルドの発生を抑制できる。しかしながら、上記のように中間部に形成した方が合流点Ｄを取付座部１６内に設定できるため、より好ましい。   In addition, if the lightening portion 35 is formed on the surface portion 25 along the flow direction X of the mounting seat portion 16, even if it is not an intermediate portion in the flow direction X, within the mold 20, within the mounting seat portion forming cavity 21, Since the flow of the molten resin entering along the surface portion 25 formation side can be suppressed, the molten resin is prevented from intersecting with the molten resin flowing in the body portion forming cavity 40 for forming the body portion 15. It is possible to suppress the occurrence of welds on the design surface 11. However, the formation at the intermediate portion as described above is more preferable because the junction point D can be set in the mounting seat portion 16.

さらには、肉抜き部３５を面部２５の流れ方向Ｘにおける上流寄りに偏って形成すれば、金型２０内で、上流側から取付座部形成キャビティ４０内に流路５８を介して面部２５の形成側に沿って流れ込む溶融樹脂よりも、下流側からこの取付座部形成キャビティ４０内に流路５９を介して面部２５の形成側に沿って流れ込む溶融樹脂の方が流れ込みやすくなり、上流側から取付座部形成キャビティ４１内にその面部２５の形成側に沿って流れ込む溶融樹脂が、本体部形成キャビティ４０内を流れる溶融樹脂に交わる前に、下流側から取付座部形成キャビティ４１にその面部２５の形成側に沿って溶融樹脂を確実に流れ込ませることができて、これらの流れを取付座部形成キャビティ４１内で確実に合流させることができる。よって、取付座部形成キャビティ４１からの溶融樹脂が、本体部形成キャビティ４０内を流れる溶融樹脂に交わるのを一層確実に抑制することができる。   Further, if the thinned portion 35 is formed to be inclined toward the upstream side in the flow direction X of the surface portion 25, the surface portion 25 of the surface portion 25 is inserted into the mounting seat portion forming cavity 40 from the upstream side in the mold 20 via the flow path 58. Rather than the molten resin flowing along the forming side, the molten resin flowing along the forming side of the surface portion 25 from the downstream side into the mounting seat forming cavity 40 via the flow path 59 is more likely to flow from the upstream side. Before the molten resin flowing along the forming side of the surface portion 25 into the mounting seat forming cavity 41 intersects with the molten resin flowing in the main body forming cavity 40, the surface portion 25 enters the mounting seat forming cavity 41 from the downstream side. Accordingly, the molten resin can be reliably flowed along the formation side, and these flows can be reliably merged in the mounting seat portion forming cavity 41. Therefore, it is possible to more reliably suppress the molten resin from the mounting seat portion forming cavity 41 from intersecting with the molten resin flowing in the main body portion forming cavity 40.

ここで、肉抜き部３５は、面部２５を貫通していなくても、面部２５を薄肉とするように面部２５の外面あるいは内面から段差状に凹む形状であっても良い。   Here, the thinned portion 35 may have a shape recessed from the outer surface or the inner surface of the surface portion 25 in a stepped manner so that the surface portion 25 is thin even if it does not penetrate the surface portion 25.

また、ゲート部２２から遠くに位置する取付座部１６ほど溶融樹脂の流れる圧が低くなるため、ウェルドが発生しやすく、よって、流れ方向Ｘに沿う面部２５に上記肉抜き部３５を形成する効果が高い。   Further, since the pressure at which the molten resin flows becomes lower as the mounting seat portion 16 located farther from the gate portion 22, a weld is likely to occur, and thus the effect of forming the above-described thinned portion 35 on the surface portion 25 along the flow direction X is achieved. Is expensive.

さらに、アルミニウム粉末等の原着材が含まれる樹脂材料は、その流れが乱れると原着材の粒子の配向性・密度が乱れることになり、それによって一層ウェルドが発生しやすいため、このような樹脂材料を用いる場合に、流れ方向Ｘに沿う面部２５に上記肉抜き部３５を形成する効果が高い。   Furthermore, resin materials containing a raw material such as aluminum powder will disturb the orientation and density of the particles of the raw material when the flow is disturbed, and this makes it easier for welds to occur. When the resin material is used, the effect of forming the above-described thinned portion 35 on the surface portion 25 along the flow direction X is high.

なお、以上の実施形態においては、本体部１５から取付座部１６が突出する場合を例にとり説明したが、参考技術として、他の種々の突出部を形成する場合にも適用可能である。例えば、図６に示すように本体部１５から流れ方向Ｘに沿う面状のリブ（突出部、面部）６１が突出する場合であっても、リブ６１の流れ方向Ｘの中間部に肉抜き部６２を形成することで、意匠面１１でのウェルドの発生を抑制できる。 In the above embodiment, the case where the mounting seat 16 protrudes from the main body 15 has been described as an example. However, as a reference technique , the present invention can be applied to the case where other various protrusions are formed. For example, as shown in FIG. 6, even if a planar rib (protrusion part, surface part) 61 along the flow direction X protrudes from the main body part 15, a lightening part is formed at the intermediate part of the rib 61 in the flow direction X. By forming 62, the occurrence of welds on the design surface 11 can be suppressed.

本発明の一実施形態の樹脂成形品を示す平面図である。It is a top view which shows the resin molded product of one Embodiment of this invention. 本発明の一実施形態の樹脂成形品における取付座部近傍を示す部分斜視図である。It is a fragmentary perspective view which shows the attachment seat part vicinity in the resin molded product of one Embodiment of this invention. 本発明の一実施形態の樹脂成形品における取付座部近傍の成形時の状態を示す断面図である。It is sectional drawing which shows the state at the time of shaping | molding of the attachment seat part vicinity in the resin molded product of one Embodiment of this invention. 本発明の一実施形態の樹脂成形品における取付座部形成キャビティを形成する金型を示す斜視図である。It is a perspective view which shows the metal mold | die which forms the attachment seat part formation cavity in the resin molded product of one Embodiment of this invention. 本発明の一実施形態の樹脂成形品の意匠面を示す平面図で、（ａ）は一端側の一部を（ｂ）は他端側の一部をそれぞれ示すものである。It is a top view which shows the design surface of the resin molded product of one Embodiment of this invention, (a) shows a part of one end side, (b) shows a part of other end side, respectively. 参考技術の樹脂成形品を示すリブ近傍の部分斜視図である。It is a fragmentary perspective view of the rib vicinity which shows the resin molded product of a reference technique . 樹脂成形品における取付座部近傍を示す部分斜視図である。It is a fragmentary perspective view which shows the attachment seat part vicinity in a resin molded product. 樹脂成形品の意匠面を示す平面図で、（ａ）は一端側の一部を（ｂ）は他端側の一部をそれぞれ示すものである。It is a top view which shows the design surface of a resin molded product, (a) shows a part of one end side, (b) shows a part of other end side, respectively. 樹脂成形品における取付座部近傍の成形時の状態を示す断面図である。It is sectional drawing which shows the state at the time of shaping | molding of the attachment seat part vicinity in a resin molded product.

符号の説明Explanation of symbols

１０ 樹脂成型品
１１ 意匠面
１２ 裏面
１５ 本体部
１６ 取付座部（突出部）
２５ 面部
２６ 下流側面部（他の面部）
３５ 肉抜き部
３６ 肉抜き部
６１ リブ（突出部、面部）
Ｘ 溶融樹脂流れ方向
DESCRIPTION OF SYMBOLS 10 Resin molding 11 Design surface 12 Back surface 15 Main body part 16 Mounting seat part (protrusion part)
25 surface part 26 downstream side surface part (other surface part)
35 Meat extraction part 36 Meat extraction part 61 Rib (protrusion part, surface part)
X Flow direction of molten resin

Claims (4)

意匠面と裏面とを有する本体部と該本体部の前記裏面から突出する突出部とが一体成形される樹脂成型品であって、
前記突出部の、前記本体部における溶融樹脂の流れ方向に沿う面部が、前記本体部に立設される板状の立設面部と前記本体部に沿う板状の頂面部とを有しており、
前記突出部には、肉抜き部が、前記立設面部および前記頂面部の両方を連続して貫通し前記頂面部の該頂面部よりも突出する頂面突出部より手前の中間位置まで形成されていることを特徴とする樹脂成形品。 A resin molded product in which a main body portion having a design surface and a back surface and a protruding portion protruding from the back surface of the main body portion are integrally formed,
The surface portion of the projecting portion along the flow direction of the molten resin in the main body portion has a plate-like standing surface portion standing on the main body portion and a plate-like top surface portion extending along the main body portion. ,
In the projecting portion, a lightening portion is formed to an intermediate position in front of the top surface projecting portion that continuously penetrates both the standing surface portion and the top surface portion and projects from the top surface portion of the top surface portion. A resin molded product characterized by 前記肉抜き部が前記立設面部および前記頂面部の、前記本体部における溶融樹脂の流れ方向における中間部に形成されていることを特徴とする請求項１に記載の樹脂成形品。   2. The resin molded product according to claim 1, wherein the lightening portion is formed at an intermediate portion of the standing surface portion and the top surface portion in the molten resin flow direction in the main body portion. 前記肉抜き部が前記立設面部および前記頂面部の、前記本体部における溶融樹脂の流れ方向における上流寄りに形成されていることを特徴とする請求項２に記載の樹脂成形品。   3. The resin molded product according to claim 2, wherein the lightening portion is formed upstream of the standing surface portion and the top surface portion in the flow direction of the molten resin in the main body portion. 前記突出部の前記立設面部および前記頂面部以外の他の面部にも肉抜き部が形成されていることを特徴とする請求項１乃至３のいずれか一項に記載の樹脂成形品。   4. The resin molded product according to claim 1, wherein a lightening portion is also formed on a surface portion other than the standing surface portion and the top surface portion of the projecting portion. 5.
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