JPS6334898Y2 - - Google Patents

Description

【考案の詳細な説明】 従来、二重壁を有する箱状成形品は公知である
が、内壁にも抜勾配を付けねばならないので内壁
の根元部が厚肉となつて外面にヒケを生じたり、
芯型を厚肉にせざるを得ず内側空間を有効に利用
できなかつた。[Detailed explanation of the invention] Conventionally, box-shaped molded products with double walls have been known, but since the inner wall must also have a draft angle, the root of the inner wall becomes thick and sinks may occur on the outer surface. ,
The core mold had to be made thicker, and the inner space could not be used effectively.

本考案は、上記従来の欠点を解消し、成形品外
面にヒケを生じず、内側空間を有効に利用できる
射出成形用金型を提供することを目的とする。 It is an object of the present invention to provide an injection mold that eliminates the above-mentioned conventional drawbacks, does not cause sink marks on the outer surface of the molded product, and can effectively utilize the inner space.

次に本考案金型の一例を図面に基いて説明す
る。１は射出成形用金型であつて、固定側金型１
１、移動側金型１２よりなり、金型１１と金型１
２が閉合された際に所望の二重壁を有する箱状成
形品２の形状に適合する型窩が形成される。３
は、箱状成形品２の外壁２１内側面と内壁２２外
側面とを形成する芯型であつて、金型閉窩時、箱
状成形品２の内壁２２内側面を形成するスライド
中子４の先端部外側面に並設された突起４１が芯
型３の内側面に当接するようになされている。５
は押出ピンである。 Next, an example of the mold according to the present invention will be explained based on the drawings. 1 is a mold for injection molding, and a fixed side mold 1
1. Consists of moving side mold 12, mold 11 and mold 1
When 2 are closed, a mold cavity is formed that conforms to the shape of the desired double-walled box-shaped molded product 2. 3
is a core mold that forms the inner surface of the outer wall 21 and the outer surface of the inner wall 22 of the box-shaped molded product 2, and the slide core 4 that forms the inner surface of the inner wall 22 of the box-shaped molded product 2 when the mold is closed. The protrusions 41 arranged in parallel on the outer surface of the distal end of the core mold 3 are adapted to abut against the inner surface of the core mold 3. 5
is an extrusion pin.

本考案射出成形用金型は叙上のように二重壁を
有する箱状成形品の外壁内側面と内壁外側面を形
成する芯型の内側面に、該成形品の内壁内側面を
形成するスライド中子の外側面に突設された突起
が当接するようなされているので射出成形時芯型
が倒れないよう、スライド中子によつて支持され
るので、成形品の内壁に抜勾配を設ける必要がな
く、芯型を薄肉にすることができるので、内壁の
根元部の外面にヒケを生じるおそれがなく、内側
空間を有効に利用することができる。 As mentioned above, the injection mold of the present invention forms the inner surface of the inner wall of the double-walled box-shaped molded product on the inner surface of the core mold that forms the inner surface of the outer wall and the outer surface of the inner wall. Since the protrusions protruding from the outer surface of the slide core come into contact with each other, the core mold is supported by the slide core so that it does not fall during injection molding, creating a draft on the inner wall of the molded product. Since this is not necessary and the core mold can be made thin, there is no risk of sink marks occurring on the outer surface of the root portion of the inner wall, and the inner space can be used effectively.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例の閉窩時を示す断面
図、第２図は同上開窩時を示す断面図である。 １：射出成形用金型、３：芯型、４：スライド
中子、４１：突起。 FIG. 1 is a sectional view showing one embodiment of the present invention when the cavity is closed, and FIG. 2 is a sectional view showing the same when the cavity is opened. 1: injection mold, 3: core mold, 4: slide core, 41: protrusion.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 二重壁を有する箱状成形品の外壁内側面と内壁
外側面を形成する芯型の内側面に、該成形品の内
壁内側面を形成するスライド中子の外側面に突設
された突起が当接するようなされている射出成形
用金型。 On the inner surface of the core mold that forms the inner surface of the outer wall and the outer surface of the inner wall of a box-shaped molded product having a double wall, there is a protrusion that protrudes from the outer surface of the slide core that forms the inner surface of the inner wall of the molded product. Injection molds that are in contact with each other.