JPS6394711U

JPS6394711U -

Info

Publication number: JPS6394711U
Application number: JP19047986U
Authority: JP
Priority date: 1986-12-12
Filing date: 1986-12-12
Publication date: 1988-06-18
Also published as: JPH0346895Y2

Description

[Brief explanation of drawings]

第１図はこの考案に係る射出成形金型の一実施
例の構成を示す断面図；第２図はサブマリンゲー
トの形状を示すために可動金型の一部を取り出し
て示す斜視図；第３図は溶融樹脂が充填された状
態の射出成形金型を示す断面図；第４図は可動金
型が移動されて成形品の離型動作の初期の状態を
示す断面図；第５図は離型動作が進んで、成形品
が切刃によりサブマリンゲートにおいて固化した
樹脂から切断された状態を示す断面図；第６Ａ図
及び第６Ｂ図はこの一実施例の第１の変形例を夫
々示す斜視図及び断面図；第７Ａ図及び第７Ｂ図
はこの一実施例の第２の変形例を夫々示す斜視図
及び断面図；第８Ａ図及び第８Ｂ図はこの一実施
例の第３の変形例を夫々示す斜視図及び断面図；
第９図は従来のサブマリンゲートの形状を示す断
面図；第１０図は従来のサブマリンゲートを備え
た射出成形金型において、成形品の離型時の初期
状態を示す断面図；そして第１１図は従来のサブ
マリンゲートを備えた射出成形金型において離型
時のカケの発生を示す断面図である。図中、１０……射出成形金型、１２……固定金
型、１４……可動金型、１６……キヤビテイ、１
８……ランナ、２０……サブマリンゲート、２２
……切刃、２４……フラツト面、２６……開口部
、２８，３０……エジエクタピン、３２……通路
、３４……成形品、３６……クラツクである。 Fig. 1 is a sectional view showing the configuration of an embodiment of the injection molding mold according to this invention; Fig. 2 is a perspective view showing a part of the movable mold taken out to show the shape of the submarine gate; The figure is a sectional view showing the injection mold filled with molten resin; Figure 4 is a sectional view showing the initial state of the molded product being released after the movable mold has been moved; A sectional view showing a state in which the molded product is cut from the solidified resin at the submarine gate by a cutting blade after the mold operation has progressed; FIGS. 6A and 6B are perspective views showing the first modification of this embodiment, respectively. Figures and sectional views; Figures 7A and 7B are perspective views and sectional views respectively showing a second modification of this embodiment; Figures 8A and 8B are a third modification of this embodiment; A perspective view and a sectional view showing respectively;
Fig. 9 is a sectional view showing the shape of a conventional submarine gate; Fig. 10 is a sectional view showing the initial state of a molded product when it is released from the mold in an injection mold equipped with a conventional submarine gate; and Fig. 11. is a cross-sectional view showing the occurrence of chips during mold release in a conventional injection mold equipped with a submarine gate. In the figure, 10... injection mold, 12... fixed die, 14... movable die, 16... cavity, 1
8...Ranna, 20...Submarine Gate, 22
. . . Cutting blade, 24 . . . Flat surface, 26 . . . Opening, 28, 30 .

Claims

[Scope of Claim for Utility Model Registration] (1) Molten resin is flowed from the runner into the cavity through a submarine gate formed in a movable mold, and a cutting edge is formed at the joint between the submarine gate and the cavity. In the injection mold, the cavity side end of the submarine gate,
An injection molding mold characterized in that a portion facing the cutting blade is provided with a flat surface set so that the minimum cross-sectional area of the submarine gate including the tip of the cutting blade appears on the opening surface to the cavity. . (2) The injection molding mold according to claim 1, wherein the flat surface stands upright with respect to the side surface of the cavity. (3) At the cavity side end of the flat surface,
An injection mold according to claim 1, which is characterized by being provided with a protrusion. (4) The injection mold according to claim 3, wherein the protrusion is provided at the center of the edge on the cavity side. (5) The injection mold according to claim 3, wherein the protrusion is disposed along the entire length of the edge on the cavity side. (6) The injection mold according to claim 3, wherein the protrusion includes a protrusion that protrudes into the cavity. (7) The injection mold according to claim 6, wherein the protruding portion is rounded.