JPH0262350B2 - - Google Patents
Info
- Publication number
- JPH0262350B2 JPH0262350B2 JP60222423A JP22242385A JPH0262350B2 JP H0262350 B2 JPH0262350 B2 JP H0262350B2 JP 60222423 A JP60222423 A JP 60222423A JP 22242385 A JP22242385 A JP 22242385A JP H0262350 B2 JPH0262350 B2 JP H0262350B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- model body
- molding
- flask
- fugitive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 74
- 238000000465 moulding Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 22
- 239000012778 molding material Substances 0.000 claims description 12
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- 229920003002 synthetic resin Polymers 0.000 claims description 6
- 239000000057 synthetic resin Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000011799 hole material Substances 0.000 description 52
- 238000009423 ventilation Methods 0.000 description 20
- 239000002184 metal Substances 0.000 description 12
- 238000007796 conventional method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004794 expanded polystyrene Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、減圧鋳型の造型方法、特に注湯時
における通気孔を備えた減圧鋳型の造型方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for making a vacuum mold, and particularly to a method for making a vacuum mold provided with ventilation holes during pouring.
一般に減圧鋳型を構成する上型および下型の造
型方法は、上型または下型の一方に関していえ
ば、模型本体の上面全体に造型用膜状遮蔽材を吸
着被覆させる第１工程と、吸着被覆させた前記遮
蔽材を介して前記模型本体上に鋳型枠を載置して
同鋳型枠内に充填材を充填する第２工程と、前記
充填材の上面全体を被覆用膜状遮蔽材にて覆蓋し
前記鋳型枠内を減圧させる第３工程と、前記各工
程を経て形成された鋳型から前記模型本体を型抜
きする第４工程とからなる基本的な４工程によつ
て実施されている。このようにして形成された減
圧鋳型においては、鋳型枠内の充填材は、鋳型枠
に当接する部分を除きすべての外表面が遮蔽材で
おおわれ減圧されて大気と遮断されている。した
がつて、周知のように、上型の所定の部位に通気
孔を設けて、鋳型注湯の初期においては、鋳型空
隙部に存在する空気、遮蔽材や中子粘結材の燃焼
生成ガス、水蒸気、および溶湯から発生するガス
等を排出させ、かつ注湯途中においては、この通
気孔から逆に大気を吸入して、鋳型空隙部が減圧
状態となることを防ぐことが必要である。なお、
注湯後揚り、押湯等として機能する鋳型空隙部の
うち上型上面に開口するものは、鋳型注湯時に通
気孔の作用を兼ねさせることができるので、以下
通気孔という場合には、上型上面に開口し、注湯
後揚り、押湯等の機能をもつ鋳型空隙部も含むも
のとする。
In general, the manufacturing method for the upper and lower molds that constitute a vacuum mold consists of a first step of adsorbing and coating the entire upper surface of the model body with a film-like shielding material for molding, and a first step of adsorbing and coating the entire upper surface of the model body. a second step of placing a mold flask on the model body through the shielding material and filling the mold flask with a filler, and covering the entire upper surface of the filler with a film-like shielding material. The process is carried out in four basic steps, including a third step of covering the mold flask and reducing the pressure inside the mold flask, and a fourth step of cutting out the model body from the mold formed through each of the above steps. In the vacuum mold formed in this manner, all the outer surfaces of the filling material in the mold flask, except for the portion that contacts the mold flask, are covered with a shielding material to reduce the pressure and isolate it from the atmosphere. Therefore, as is well known, ventilation holes are provided in predetermined parts of the upper mold to prevent air existing in the mold cavity and gases produced by combustion of the shielding material and core caking material at the initial stage of mold pouring. It is necessary to exhaust water vapor, gases, etc. generated from the molten metal, and to inhale the atmosphere through the vent holes during pouring to prevent the mold cavity from becoming depressurized. In addition,
Among the mold cavities that function as risers, risers, etc. after pouring molten metal, those that open on the upper surface of the upper mold can also function as ventilation holes when pouring molten metal into the mold, so hereinafter referred to as ventilation holes, It also includes a mold cavity that opens on the upper surface of the upper mold and has functions such as pouring and raising, and a riser.
ところで、通気孔の成形方法として従来慣用さ
れているのは、第５図に示すとおり、まず通気用
原型取り付け用台座１１ａを設けた模型本体１１
に、熱可塑性膜状造型用遮蔽材１４を吸着被覆さ
せる（第１工程）。他方、木材等によつて形成さ
れた通気孔用原型１２の外周面に原型用膜状遮蔽
材１３を気密に巻き付けたものを予め準備してお
く。しかして、これを模型本体に取り付るには、
第１工程を終つたのちに、取り付け用台座１１ａ
の部位に吸着した造型用遮蔽材１４ａを除去し、
通気孔用原型１２を取り付けたのち、第６図に示
すとおり、模型本体１１のこの部位に残つた遮蔽
材１４の周縁と通気孔用原型１２に巻き付けた遮
蔽材１３の下縁とを粘着テープ１５により気密に
接合する。次に遮蔽材１４を介して模型本体１１
の上面に鋳型枠を載置し、同枠内に充填材１６を
充填して（第２工程）、その上面を被覆用膜状遮
蔽材１７で覆蓋したのち減圧造型する（第３工
程）。そして、第４工程の型抜きに先立つて鋳型
枠上面に吸着された遮蔽材１７の通気孔用原型１
２の上端に当接する部分を除去し、残つた遮蔽材
１７の周縁と通気孔用原型１２に巻き付けた遮蔽
材１３の上縁とを気密に接合する。第４工程を終
つたのちに、通気孔用原型１２を上方に抜き取
る。 By the way, as shown in FIG. 5, the conventional method of forming the ventilation hole is to first form the model body 11 on which a pedestal 11a for attaching the ventilation mold is provided.
Then, a thermoplastic membrane-shaped molding shielding material 14 is adsorbed and coated (first step). On the other hand, a prototype film-like shielding material 13 is airtightly wrapped around the outer peripheral surface of a ventilation hole prototype 12 made of wood or the like, which is prepared in advance. However, in order to attach this to the model body,
After completing the first step, the mounting pedestal 11a
Remove the molding shielding material 14a adsorbed to the part,
After attaching the ventilation hole prototype 12, as shown in FIG. 15 to airtightly join. Next, the model body 11 is
A mold flask is placed on the upper surface of the mold, the filler 16 is filled in the frame (second step), and after the upper surface is covered with a covering film-like shielding material 17, vacuum molding is performed (third step). The ventilation hole prototype 1 of the shielding material 17 is adsorbed onto the upper surface of the mold flask prior to the mold cutting in the fourth step.
2 is removed, and the peripheral edge of the remaining shielding material 17 and the upper edge of the shielding material 13 wrapped around the vent pattern 12 are hermetically joined. After completing the fourth step, the vent pattern 12 is pulled out upward.
上述のように、従来の通気孔の成形方法による
と、多くの工程を要する。特に鋳型枠を効果的に
使用するために、一枠に複数個込めをする場合に
は、通気孔成形作業が造型工程遅延の溢路となつ
ている。
As mentioned above, the conventional method for forming vent holes requires many steps. Particularly when a plurality of molds are placed in one mold flask in order to use the flask effectively, the work of forming the vent hole becomes a source of delays in the molding process.
さらに重要な問題は、上記の複数個込めの場合
に、通気孔成形作業を簡単化して造型能率を上げ
る目的をもつて、できるだけ通気孔の数を減らそ
うとして、これを個々の鋳型空隙部の頂部には設
けず、第７図に示すように、空隙頂部より低い場
所に１枠中に含まれる数個の鋳物（空隙部）に共
用の通気孔（２２は通気孔用原型を示す。）を設
けることが多かつた。ところがこの場合には、注
湯に際して通気孔の下端まで溶湯水準面が到達し
たあとは、通気孔のない鋳型空隙部に閉じこめら
れた空気、ガス等は逃げにくくなり、その圧力の
ために、この空隙部への溶湯の流入速度が不安定
となり、溶湯の充填が不円滑となつて、結果とし
て鋳物製品表面に湯じわその他の欠陥を生じやす
い。 An even more important problem is that in the case of multiple vent holes as described above, the number of vent holes is reduced as much as possible with the aim of simplifying the vent molding work and increasing molding efficiency. It is not provided at the top, but as shown in Figure 7, there is a vent hole that is shared by several castings (voids) included in one frame at a location lower than the top of the void (22 indicates the prototype for the vent). was often set up. However, in this case, after the molten metal level reaches the bottom of the vent hole during pouring, it becomes difficult for air, gas, etc. trapped in the mold cavity without a vent hole to escape, and due to the pressure, this The flow rate of the molten metal into the void becomes unstable, making the filling of the molten metal uneven, and as a result, molten metal wrinkles and other defects are likely to occur on the surface of the cast product.
この発明はこれらの問題を解決し、所望の部位
に安易に通気孔を成形できる新規な方法を提供す
るためになされたもので、前記減圧鋳型造型法に
おいて、前記第１工程に先立つて前記模型本体上
面の所定の部位に、その上下方向に貫通する中空
孔を有しかつその上面が鋳型枠上縁に露呈する発
泡合成樹脂材料等からなり鋳型注湯時に燃焼消失
する消失性通気孔用型材の下端を位置ぎめ固定
し、ついで前記第１ないし第３工程を経て互に密
着した前記両遮蔽材の前記中空孔の上端における
重合部分を除去して同中空孔を開口し同重合部分
の周縁を気密に接合したのち、第４工程により型
抜きするようにしたことによつて構成されてお
り、型抜きに際しては前記型材をすべて鋳型内に
残すようにし、鋳型内への注湯時に前記型材の有
する中空孔によつて通気孔が形成される。
This invention has been made in order to solve these problems and provide a new method by which a vent hole can be easily formed in a desired part. A fugitive vent hole molding material that is made of a foamed synthetic resin material, etc., which has a hollow hole penetrating vertically in a predetermined part of the upper surface of the main body, and whose upper surface is exposed at the upper edge of the mold flask, and which disappears by combustion when pouring into the mold. The lower ends of the shielding materials are positioned and fixed, and then the overlapping portions at the upper ends of the hollow holes of the two shielding materials that have come into close contact with each other through the first to third steps are removed, the hollow holes are opened, and the periphery of the overlapping portions is removed. After the molding is airtightly joined, the molding is performed in the fourth step, and when the molding is performed, all of the molding material is left in the mold, and when pouring the metal into the mold, the molding material is removed. A ventilation hole is formed by the hollow hole.
上述のとおり、この発明の方法においては、造
型用遮蔽材は単に模型本体の遮蔽用としてだけで
なく、消失性通気孔用型材をも含め模型本体の上
面全体を一体的に遮蔽するために用いられるの
で、型抜きに際して、前記型材はすべてそのまま
の位置で鋳型内に残され、鋳型への注湯に際して
は最初は型材に設けられた中空孔が通気孔として
作用し、またそれが燃焼消失したあとでは、それ
ぞれ揚り、押湯等として機能を果す。
As mentioned above, in the method of the present invention, the molding shielding material is used not only to shield the model body, but also to integrally shield the entire upper surface of the model body, including the fugitive ventilation hole molding material. Therefore, when the mold is removed, all of the mold material is left in the same position in the mold, and when pouring metal into the mold, the hollow hole provided in the mold material initially acts as a ventilation hole, and it burns and disappears. Later, they each function as a fryer, a riser, etc.
この発明の方法においては、消失性通気孔用型
材を模型本体に位置決め固定した状態で、造型用
遮蔽材によつて前記型材を含めた模型本体の上面
全体を一体的に遮蔽し、かつ型抜きに際したは前
記型材を鋳型内にそのまま残すことを要旨として
いるので、従来の方法にくらべて簡単で通気孔成
形に必要とする工程が少ない。
In the method of the present invention, with the fugitive ventilation hole molding material positioned and fixed on the model body, the entire upper surface of the model body including the molding material is integrally shielded by a molding shielding material, and the mold is removed. Since the key point of this method is to leave the mold material as it is in the mold, it is simpler than the conventional method and requires fewer steps for forming the vent holes.
このため、通気孔を所望の鋳型空隙部の頂部だ
けでなく、鋳型内の空気、ガス等が閉じ込められ
て抜けにくいいわゆるポケツト部のすべての頂部
に直接安易に設けることができる。したがつて、
この発明による通気孔の成型方法を適用した減圧
鋳型においては、共用の通気孔を設置する必要が
ないため、共用通気孔特有の湯じわ等の欠陥の発
生を確実に防止することができる。 Therefore, ventilation holes can be easily and directly provided not only at the tops of desired mold cavities, but also directly and easily at all the tops of so-called pockets where air, gas, etc. in the mold are trapped and difficult to escape. Therefore,
In the vacuum mold to which the vent molding method according to the present invention is applied, there is no need to install a common vent, so it is possible to reliably prevent the occurrence of defects such as hot water wrinkles that are unique to common vents.
要するに、この発明の方法における通気孔用型
材は、他の構成要素を伴わず全体が発泡合成樹脂
材料等からなり消失性を有するので、鋳型への注
湯時にまず通気孔として作用したのち、完全に燃
焼消失し、中空孔を含めて型材が占めていた全容
積を充満した溶湯によつて押湯、揚りが形成さ
れ、それぞれ単独で健全な鋳物製品の製造に要求
される機能を有する。 In short, the vent material used in the method of this invention is entirely made of foamed synthetic resin material without any other constituent elements and has a vanishing property, so it first acts as a vent when pouring into the mold, and then completely The molten metal that burns and disappears and fills the entire volume occupied by the mold material, including the hollow hole, forms a riser and a riser, each of which independently has the functions required for manufacturing sound cast products.
この発明の一実施例を第１図ないし第４図を参
照しながら説明する。第１図には模型本体１の上
面全体に熱可塑性プラスチツクフイルムからなる
造型用遮蔽材４を吸着被覆させた状態を（第１工
程）、第２図には鋳型枠５内に珪酸質充填材６を
充填し（第２工程）、ブラスチツクフイルムから
なる被覆用遮蔽材７により覆蓋した状態を（第３
工程）、第３，４図には第２図の要部を拡大して
それぞれ示す。第１図において、模型本体１の上
面には通気孔を設けようとする部位に通気孔用型
材取り付け用台座１ａが予め設置されている。発
泡ポリスチレンによて形成された通気孔用型材２
には、その上下方向に貫通する中空孔２ａが穿設
されているが、この中空孔２ａの上端は減圧の際
の吸引と充填の際の充填材の落ち込みを防止する
ため、粘着テープからなる閉塞材３によつて予め
気密に閉塞しておく。まず、型材２の下端を中空
孔２ａを介して取り付け用台座１ａに嵌合し型材
２を固定自立させる。このような型材２を固定自
立させた模型本体１の上面全体に予め加熱した造
型用遮蔽材４を通常の方法により一体的に吸着被
覆させる（第１図、第１工程）。次に造型用遮蔽
材４によつて被覆された模型本体１の上に鋳型枠
５を載置し、同枠５内に珪酸質充填材６を微振動
を与えながら充填したうえ、充填材６の上面をな
らして被覆用遮蔽材７によつて覆蓋する（第２図
および第３図、第２および第３工程）。このとき、
被覆用遮蔽材７の下面と造型用遮蔽材４の上面と
が型材２の上面の部位で重合している。その後、
通常の方法により鋳型枠５の内部を減圧する（第
３工程）。次に第４図に示すように互に密着した
両遮蔽材４，７の型材中空孔２ａの上端における
重合部分を閉塞材３とともに除去して同中空孔を
開口し、残つた両遮蔽材４，７の周縁を気密に接
合したのち型抜きを行う（第４工程）。この場合
に、型材２として、その上面が適当な面積の平面
を有するような形状のものを用いれば、鋳型枠５
内部の減圧によつて、両遮蔽材４，７の重合部分
が該平面上でそのまま互いに容易に気密に接着す
る。
An embodiment of the present invention will be described with reference to FIGS. 1 to 4. Fig. 1 shows a state where the entire upper surface of the model body 1 is adsorbed and coated with a molding shielding material 4 made of thermoplastic plastic film (first step), and Fig. 2 shows a state in which a silicic acid filler is placed inside the mold flask 5. 6 (second step) and covered with a covering shielding material 7 made of plastic film (third step).
FIGS. 3 and 4 each show an enlarged view of the main part of FIG. 2. In FIG. 1, a pedestal 1a for attaching a vent hole material is previously installed on the upper surface of a model body 1 at a portion where a vent hole is to be provided. Air vent mold material 2 made of expanded polystyrene
A hollow hole 2a is bored through the hole 2a in the vertical direction, and the upper end of this hollow hole 2a is made of adhesive tape to prevent suction during depressurization and to prevent the filling material from falling during filling. It is sealed airtightly with a closing material 3 in advance. First, the lower end of the molded material 2 is fitted into the mounting pedestal 1a through the hollow hole 2a, so that the molded material 2 is fixed and self-supporting. The entire upper surface of the model body 1, in which such a mold material 2 is fixed and self-supporting, is integrally adsorbed and coated with preheated molding shielding material 4 by a conventional method (FIG. 1, first step). Next, the mold frame 5 is placed on the model body 1 covered with the molding shielding material 4, and the silicic acid filler 6 is filled into the frame 5 while giving a slight vibration. The upper surface is leveled and covered with a covering shielding material 7 (FIGS. 2 and 3, second and third steps). At this time,
The lower surface of the covering shielding material 7 and the upper surface of the molding shielding material 4 overlap at the upper surface of the mold material 2 . after that,
The inside of the mold flask 5 is depressurized by a normal method (third step). Next, as shown in FIG. 4, the overlapping portions of the shielding materials 4 and 7 that are in close contact with each other at the upper end of the hollow hole 2a of the mold material are removed together with the closing material 3 to open the hollow hole, and the remaining shielding materials 4 and 7 are removed. , 7 are airtightly joined, and then die-cutting is performed (fourth step). In this case, if the mold material 2 is shaped so that its upper surface has a flat surface of an appropriate area, the mold flask 5
Due to the internal reduced pressure, the overlapping portions of both shielding materials 4 and 7 are easily and airtightly adhered to each other on the plane.
以上に述べた実施例から明らかなように、この
発明の方法によれば、中空孔を有する消失性型材
のみを用いて、通気孔が極めて簡単な工程により
成形できので、通気孔を鋳型の所望の部位に安易
に設けることができる。したがつて造型能率の向
上ばかりでなく、共用通気孔の採用に伴なう鋳物
製品の欠陥の発生も防止することができた。ま
た、鋳型への注湯によつて型材が完全に燃焼消失
したあとは、中空孔を含めて型材が占めていた全
容積を充満した溶湯によつて揚り、押湯等の作用
も兼ねさせることができる。 As is clear from the embodiments described above, according to the method of the present invention, vent holes can be formed in an extremely simple process using only fugitive molding material having hollow holes. It can be easily installed at the location. Therefore, not only the molding efficiency was improved, but also the occurrence of defects in cast products due to the use of common ventilation holes could be prevented. In addition, after the mold material is completely burned and destroyed by pouring the metal into the mold, the entire volume occupied by the mold material, including the hollow holes, is filled with molten metal, which doubles as a feeder. be able to.
なお、消失性通気孔用型材の形成材料として
は、鋳型注湯の際迅速に燃焼消失する性質を有す
るものであればよく、例えば前記実施例のように
いわゆるフルモールド法で慣用されているポリス
チレンに発泡剤を含浸させたもののほか、一般的
に発泡性を有する合成樹脂材を用いることができ
る。 The material for forming the mold material for the fugitive vent hole may be any material that has the property of burning and disappearing quickly during pouring into the mold, such as polystyrene, which is commonly used in the so-called full mold method as shown in the above example. In addition to those impregnated with a foaming agent, synthetic resin materials that generally have foaming properties can be used.
また、この発明の方法の実施に際しては、発泡
合成樹脂材料を用いて、通気孔用として、またこ
れを揚り、押湯等として兼用する場合にも、それ
ぞれ予め定められた形状、寸法に成形したものを
所要個数準備しておくと便利である。通気孔用型
材に設けた中空孔は、型材を模型本体の取り付け
用台座に嵌合自立させる機能を兼用させることが
できる。また、通気孔用型材の上面周縁に丸みを
もたせることにより、造型用遮蔽材を吸着させる
ときに、その破れを防ぐようにすることができ
る。さらに、予め準備された所定寸法の型材を互
に接合して任意の長さとすることもできる。 In addition, when carrying out the method of the present invention, foamed synthetic resin materials are used to mold them into predetermined shapes and dimensions, both for vent holes and for use as fryers, feeders, etc. It is convenient to prepare the required number of items. The hollow hole provided in the ventilation hole mold material can also serve the function of fitting the mold material into the mounting pedestal of the model body and making it self-supporting. Further, by rounding the upper surface of the vent molding material, it is possible to prevent the molding shielding material from being torn when it is adsorbed. Furthermore, pre-prepared shapes of predetermined dimensions can be joined to each other to form an arbitrary length.
第１図はこの発明の方法により模型本体の上面
に造型用遮蔽材を吸着被覆させた状態における減
圧鋳型の部分縦断面図、第２図は鋳型枠内に充填
材を充填し被覆用遮蔽材により覆蓋した状態にお
ける部分縦断面図、第３図は第２図の部分拡大縦
断面図、第４図は第３図における両遮蔽材および
閉塞材の重合部分を除去し、残つた両遮蔽材の周
縁を接合した状態における部分拡大縦断面図、第
５および第６図は従来の通気孔成形方法を示す部
分縦断面図、第７図は従来の共用通気孔成形方法
を示す部分縦断面図である。
符号の説明、１……模型本体、１ａ……通気孔
用型材取り付け用台座、２……通気孔用型材、２
ａ……同中空孔、３……閉塞材、４……造型用遮
蔽材、５……鋳型枠、６……充填材、７……被覆
用遮蔽材、１１ａ……通気孔用原型取り付け用台
座、１２……通気孔用原型、１３……原型用遮蔽
材、１４……造型用遮蔽材、２２……共用通気孔
用原型。
Fig. 1 is a partial vertical cross-sectional view of a vacuum mold in which a molding shielding material is adsorbed and coated on the upper surface of the model body by the method of the present invention, and Fig. 2 is a partial vertical cross-sectional view of a vacuum mold in which a molding shielding material is adsorbed and coated on the top surface of the model body by the method of the present invention. 3 is a partially enlarged vertical sectional view of FIG. 2, and FIG. 4 is a partial vertical sectional view of the covered state after removing the overlapping portions of both shielding materials and occluder in FIG. 3, and showing the remaining shielding materials. Fig. 5 and 6 are partial longitudinal sectional views showing a conventional method for forming vent holes, and Fig. 7 is a partial longitudinal sectional view showing a conventional method for forming common air vents. It is. Explanation of symbols, 1... Model body, 1a... Pedestal for attaching the vent material, 2... Ventilation hole material, 2
a... Same hollow hole, 3... Closing material, 4... Shielding material for molding, 5... Molding flask, 6... Filling material, 7... Shielding material for covering, 11a... For attaching prototype for ventilation hole. Pedestal, 12... Prototype for ventilation hole, 13... Shielding material for prototype, 14... Shielding material for molding, 22... Prototype for common ventilation hole.
Claims (1)
着被覆させる第１工程と、吸着被覆させた前記遮
蔽材を介して前記模型本体上に鋳型枠を載置して
同鋳型枠内に充填材を充填する第２工程と、前記
充填材の上面全体を被覆用膜状遮蔽材にて覆蓋し
前記鋳型枠内を減圧させる第３工程と、前記各工
程を経て形成された鋳型から前記模型本体を型抜
きする第４工程とからなる減圧鋳型造型法におい
て、前記第１工程に先立つて前記模型本体上面の
所定の部位に、その上下方向に貫通する中空孔を
有しかつその上面が鋳型枠上縁に露呈する発泡合
成樹脂材料等からなり鋳型注湯時に燃焼消失する
消失性通気孔用型材の下端を位置ぎめ固定し、つ
いで前記第１ないし第３工程を経て互に密着した
前記両遮蔽材の前記型材中空孔の上端における重
合部分を除去して同中空孔を開口し同重合部分の
周縁を気密に接合したのち、第４工程により型抜
きするようにしたことを特徴とする減圧鋳型造型
法。 ２ 消失性通気孔用型材が発泡合成樹脂材料によ
り形成されていることを特徴とする第１項記載の
減圧鋳型造型法。 ３ 消失性通気孔用型材に設けた中空孔の下端が
前記型材を模型本体に設けた台座に位置決め固定
する際の嵌合部であることを特徴とする第１項記
載の減圧鋳型造型法。 ４ 消失性通気孔用型材の上面周縁が丸みを有す
るようにしたことを特徴とする第１項記載の減圧
鋳型造型法。[Scope of Claims] 1. A first step of adsorbing and coating the entire upper surface of the model body with a film-like shielding material for modeling, and placing a mold flask on the model body through the adsorbed and coated shielding material. A second step of filling the filler into the mold flask, a third step of covering the entire upper surface of the filler with a covering film-like shielding material and reducing the pressure inside the mold flask, and forming through each of the above steps. In the vacuum mold making method, which includes a fourth step of cutting out the model body from the mold, prior to the first step, a hollow hole is provided at a predetermined portion of the upper surface of the model body in the vertical direction. In addition, the lower end of the fugitive vent hole molding material, which is made of a foamed synthetic resin material or the like and whose upper surface is exposed at the upper edge of the mold flask and disappears by combustion when pouring into the mold, is positioned and fixed, and then the first to third steps are carried out. After removing the overlapping portion at the upper end of the hollow hole of the mold material of the two shielding materials that were in close contact with each other, opening the hollow hole, and airtightly joining the periphery of the overlapping portion, the mold was cut out in a fourth step. A vacuum molding method characterized by: 2. The vacuum mold making method according to item 1, wherein the fugitive vent hole molding material is formed of a foamed synthetic resin material. 3. The reduced-pressure mold making method according to item 1, wherein the lower end of the hollow hole provided in the fugitive vent hole molding material is a fitting portion for positioning and fixing the molding material to a pedestal provided in the model body. 4. The method for making a vacuum mold according to item 1, wherein the upper surface periphery of the fugitive vent hole mold material is rounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60222423A JPS6281245A (en) | 1985-10-04 | 1985-10-04 | Molding method for vacuum casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60222423A JPS6281245A (en) | 1985-10-04 | 1985-10-04 | Molding method for vacuum casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6281245A JPS6281245A (en) | 1987-04-14 |
| JPH0262350B2 true JPH0262350B2 (en) | 1990-12-25 |
Family
ID=16782158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60222423A Granted JPS6281245A (en) | 1985-10-04 | 1985-10-04 | Molding method for vacuum casting mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6281245A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855466A (en) * | 2016-06-02 | 2016-08-17 | 龙岩盛丰机械制造有限公司 | Brake drum one-casting six-piece V-process casting technological method and brake drum one-casting six-piece V-process casting device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540338B2 (en) * | 1974-01-23 | 1980-10-17 | ||
| JPS5433223A (en) * | 1977-08-20 | 1979-03-10 | Sintokogio Ltd | Method of molding blind feeder in reducedd pressure molding and airrpassing parts for molding blind feeder portion |
| JPS5489920A (en) * | 1977-12-28 | 1979-07-17 | Daido Steel Co Ltd | Method of forming riser gate in reduced pressure casting process |
-
1985
- 1985-10-04 JP JP60222423A patent/JPS6281245A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6281245A (en) | 1987-04-14 |
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