JPS6292058U

JPS6292058U -

Info

Publication number: JPS6292058U
Application number: JP18265785U
Authority: JP
Priority date: 1985-11-27
Filing date: 1985-11-27
Publication date: 1987-06-12

Description

[Brief explanation of the drawing]

第１図は第一の実施例における本考案の特徴と
するプランジヤチツプ付近の構造を示す部分的な
断面図。第２図は第１図の変形形態を示す断面図
。第３図は他の実施例におけるプランジヤチツプ
付近を示す断面図。第４図は更に他の実施例にお
けるプランジヤチツプ付近を示す断面図。第５図
は本考案を適用する対象となる減圧鋳造装置の一
例を示す概略断面図。２……固定型、３……可動型、４……キヤビテ
イ、５……スリーブ、６，６ａ〜６ｄ……プラン
ジヤチツプ、６ａ′〜６ｃ′……スカート部分、
６ｄ′……凹溝、６ｄ″……通路、７……注湯口
、８……金属溶湯、１２，１２ａ〜１２ｄ……プ
ランジヤロツド、１２ａ′，１２ａ″，１２ｄ′
，１２ｄ″……通路、１２ｃ′……膨らみ部分、
２０……通路、２１……配管、３０……ブロアー
装置、４０，５０……環状空間。 FIG. 1 is a partial sectional view showing the structure near the plunger tip in the first embodiment, which is a feature of the present invention. FIG. 2 is a sectional view showing a modification of FIG. 1. FIG. 3 is a sectional view showing the vicinity of the plunger tip in another embodiment. FIG. 4 is a sectional view showing the vicinity of the plunger tip in still another embodiment. FIG. 5 is a schematic sectional view showing an example of a vacuum casting apparatus to which the present invention is applied. 2... Fixed type, 3... Movable type, 4... Cavity, 5... Sleeve, 6, 6a to 6d... Plunger tip, 6a' to 6c'... Skirt part,
6d'...concave groove, 6d''...passage, 7...pouring spout, 8...molten metal, 12, 12a-12d...plunger rod, 12a', 12a'', 12d'
, 12d''... passage, 12c'... bulge part,
20... Passage, 21... Piping, 30... Blower device, 40, 50... Annular space.

Claims

[Scope of Claim for Utility Model Registration] (1) In a die-casting device that performs casting under reduced pressure in the cavity, active gas such as air or oxygen flows from the back of the plunger tip to the front through the gap between the circumferential surface of the plunger tip and the inner surface of the sleeve. A die-casting apparatus characterized in that a fluid seal forming means for forming a negative pressure region within or behind the gap is provided on the peripheral surface or rear part of the plunger tip in order to prevent fluid from flowing into the gap. (2) The fluid seal forming means communicates with the injection gas supply passage formed inside the plunger rod and the plunger tip, and is connected to the injection gas supply passage after the gap to be sealed between the peripheral surface of the plunger tip and the inner surface of the sleeve. a nozzle oriented to inject gas rearward near the end;
The die-casting apparatus according to claim 1, which is an ejector device that forms a negative pressure region by the gas injected from the nozzle. (3) A suction device in which the pressure reducing means has a suction port that opens on the peripheral surface or the rear of the plunger tip, and a suction passage formed inside the plunger tip and the plunger rod in communication with the suction port. A die-casting apparatus according to claim 1, which is a utility model.