JPH03106537A - Mold - Google Patents

Abstract

PURPOSE:To prevent involution of impurity by embedding a consumable runner plugging material for temporarily plugging head molten metal flow in the runner, opening after storing the necessary quantity of molten metal and allowing the molten metal to flow into cavity in a mold. CONSTITUTION:The molten metal reaches the consumable runner plugging material 2 formed in the runner 1, and after temporarily stagnating, the plugging material 2 is lost and the runner 1 is opened, and after gradually and smoothly storing the molten metal into basin part 4 through the runner 1, the molten metal flows into the cavity 3 in the mold. The impurity of gas, etc., is run away from a vent hole 5 or can be removed from the molten metal after accumulating into upper part of the basin part 4. Such mold can be easily designed even with a designed not expert in casting mold design.

Description

【発明の詳細な説明】 本発明は、重力鋳造法用の鋳型において、鋳型キャビテ
ィへの溶湯の流入を静穂に進行させる鋳型に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold for gravity casting, which allows molten metal to flow into a mold cavity in a static manner.

（従来の技術） 重力鋳造法用の鋳型に受口湯口から湯道を通して鋳型キ
ャビティヘ溶湯を供給する場合には、注湯開始時には取
鍋からの供給が非定常流となり、受口直下の湯道底に溶
湯が落下してガスを巻き込んだり、湯道底の鋳型材をた
たいて剥離させこれを鋳物中に包含させて欠陥となるこ
とがある。(Prior art) When supplying molten metal from the socket sprue to the mold cavity through the runner for a gravity casting mold, the supply from the ladle becomes an unsteady flow at the start of pouring, and the molten metal immediately below the socket flows. The molten metal may fall to the bottom of the runner and entrain gas, or the mold material at the bottom of the runner may be struck and peeled off, which may be incorporated into the casting, resulting in defects.

このような湯が荒れることを防ぐために、受口に湯溜り
を設けたり、湯口を先細りにしたり、湯口底を耐火煉瓦
にしたりするような、夾雑物やガスを巻き込むことを防
止するための鋳造方案や、渇道途中にストレーナーを設
けた鋳型構造などの種々のものが考えられている．（丸
善株式会社発行「鋳物便覧」湯口と押湯の項参照） （発明が解決しようとする課題） このような鋳造方案で新しい設計の鋳型の最良のものを
試行無しに設計することは、熟練者でないと設計できな
いという問題点がある。In order to prevent such hot water from becoming rough, casting methods are used to prevent contaminants and gas from being drawn in, such as installing a pool at the socket, making the sprue tapered, and making the bottom of the sprue a refractory brick. Various methods have been considered, including a mold structure with a strainer installed in the middle of the throat. (Refer to the section on sprues and risers in the "Foundry Handbook" published by Maruzen Co., Ltd.) (Problem to be solved by the invention) It takes skill to design the best new mold design for such a casting method without trial. The problem is that it cannot be designed unless you are an expert.

このような状況の下で少量多品種の鋳物を生産する場合
に、逐一トライアルして良好なＳｓ型を得ようとするこ
とは生産効率が悪いという問題点がある。When producing a wide variety of castings in small quantities under such circumstances, there is a problem in that production efficiency is poor if a trial is made one by one to obtain a good Ss mold.

（課題を解決するための手段） 本発明は上記の課題を解決するために発明さわたもので
、注湯開始時に乱流状態で鋳型キャビティに流入する先
預流を一時的に閉塞する消失性湯道閉塞材を湯道に埋設
し、湯道に必要量の溶湯を貯留した後に開通して溶渇を
静穏に鋳型キャビティに流入させることを特徴とする鋳
型である．消失性湯道閉塞材は発泡スチロール製品を用
いるのが良い。(Means for Solving the Problems) The present invention was invented in order to solve the above problems. This mold is characterized in that a runner blocker is buried in the runner, and after the required amount of molten metal is stored in the runner, the runner is opened to allow the molten metal to flow quietly into the mold cavity. It is best to use a Styrofoam product as the fugitive runner blocker.

溶渇によって消失性湯道閉塞材が燃焼ないしガス化する
際に発生するガスを逃がすために、消失性湯道閉塞材を
埋設した箇所から鋳型外部に向けてベントホールを設け
るか，または，消失性湯道閉塞材の埋設箇所から鋳型キ
ャビティに通ずる湯道の途中に湯溜りを設け、ここでガ
ス抜き作用をさせ、または、湯あか砂ゴミなどの夾雑物
を除去する作用のある鋳型構造にする． （作用と実施例） 第１図に本発明の鋳型を図解したように、湯道ｆｉｌに
形成した膨大室に埋設された消失性湯道閉塞材１２｝　
に溶湯が到達すると、溶湯は一時的に消失性湯道閉塞材
（２）の手前で停滞し、その後に消失性湯道閉塞材（２
）は消失し始める。In order to release the gas generated when the fugitive runner blocker burns or gasifies due to melting, a vent hole is provided from the place where the fugitive runner blocker is buried toward the outside of the mold, or the fugitive runner blocker is buried. A pool is provided in the middle of the runner that leads from the buried part of the runner blocker to the mold cavity, and the mold structure has the function of degassing or removing impurities such as scale and sand. ．． (Operations and Examples) As shown in FIG. 1, which illustrates the mold of the present invention, the fugitive runner blocker 12 is buried in the vast chamber formed in the runner fil.
When the molten metal reaches the fugitive runner blocker (2), the molten metal temporarily stagnates before the fugitive runner blocker (2).
) begins to disappear.

そして消失性湯道閉塞材（２）の手前に停滞した溶湯は
、消失性湯道閉塞材（２）を消失させて湯道（Ｉｔを開
通させ、徐々に平穏に瀾道（１）を通って渇溜り（４）
に溜ってから鋳型キャビティ（３）中に流入する． 消失性湯道閉塞材（２）によって停滞させられた溶湯は
、ガスや夾雑物を浮上もしくは渇道表面に付着させて、
これをキャビティ内に巻き込むことの間に湯溜り（４）
を設けると、消失性湯道閉塞材（２）の燃焼ガス、また
は残渣などの夾雑物は湯溜り（４）と連通するベントホ
ール（５）から逸出するか、または溶渇よりも軽いから
、湯溜り（４）の上部に溜って溶湯からさらに除去され
易くなる他、早期に溶湯が湯口まで上昇するので、ガス
や夾雑物が湯口まで上昇し易く、鋳型キャビティ（３）
への巻き込みが少なくなる． （発明の効果） 本発明の鋳型は、注湯開始時に乱流状態で鋳型キャビテ
ィに流入する先頭流を一時的に閉塞する消失性湯道閉塞
材を湯道に埋設し，湯道に必要量の溶湯を貯留した後に
開通して溶湯を静穏に鋳型キャビティに流入させる鋳型
であるので、消失性渇道閉塞材の手前に停滞した溶湯は
、不純物を巻き込むことなく徐々に平穏に湯道を通って
鋳型キャビティ中に流入し、その流入が平穏であるので
ガスや夾雑物が浮上し易くなるとともに、溶湯が荒れる
ことがないという利点があり、このような鋳型は、鋳型
方案の熟練者でなくとも容易に設計できるという利点も
あり、本発明は、産業の発達に寄与するところ極めて大
なるものがある．Then, the molten metal that has stagnated in front of the fugitive runner blocker (2) disappears, opens the runner (It), and gradually passes through the trough (1) peacefully. Thirst (4)
It accumulates in the mold cavity (3) and then flows into the mold cavity (3). The molten metal that has been stagnated by the fugitive runner blocker (2) causes gas and impurities to float to the surface or adhere to the duct surface.
A puddle of hot water (4) occurs between the roll-up of this into the cavity.
If this is provided, the combustion gas of the fugitive runner blocker (2) or impurities such as residue will escape from the vent hole (5) communicating with the hot water pool (4), or because it is lighter than the melted water. In addition to accumulating at the top of the sump (4) and being further removed from the molten metal, the molten metal rises to the sprue early, making it easier for gases and foreign substances to rise to the sprue, and forming mold cavities (3).
There will be less involvement in (Effects of the Invention) The mold of the present invention has a fugitive runner blocker buried in the runner which temporarily blocks the leading flow flowing into the mold cavity in a turbulent state at the start of pouring, and the required amount The mold stores molten metal and then opens to allow the molten metal to flow quietly into the mold cavity, so the molten metal that stagnates in front of the evanescent thirst occlusion material gradually and calmly passes through the runner without involving impurities. Flows into the mold cavity, and the flow is smooth, which makes it easier for gases and foreign matter to float to the surface, and has the advantage that the molten metal does not become rough. This invention also has the advantage that it can be easily designed, and the present invention will greatly contribute to the development of industry.

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

第１図は本発明の鋳型の縦断面説明図である。 １．．．．．湯道．　２．．．．．消失性湯道閉塞材；
３．．．．．鋳型キャビティ；　４．．．．．渇溜り；
５．．．．．ベントホール． 第　１　図FIG. 1 is an explanatory longitudinal cross-sectional view of the mold of the present invention. 1. ．． ．． ．． ．． Yudo. 2. ．． ．． ．． ．． Disappearing runner blocker;
3. ．． ．． ．． ．． Mold cavity; 4. ．． ．． ．． ．． Thirst;
5. ．． ．． ．． ．． Vent hole. Figure 1

Claims (1)

【特許請求の範囲】[Claims] 　注湯開始時に乱流状態で鋳型キャビティに流入する先
頭流を一時的に閉塞する消失性湯道閉塞材を湯道に埋設
し、湯道に必要量の溶湯を貯留した後に開通して溶湯を
静穏に鋳型キャビティに流入させることを特徴とする鋳
型。A fugitive runner blocker is buried in the runner to temporarily block the leading flow that flows into the mold cavity in a turbulent state at the start of pouring, and after the required amount of molten metal has been stored in the runner, it is opened to allow the molten metal to flow. A mold characterized in that it flows quietly into a mold cavity.