JPS61182846A - Forming method for mold for lengthy casting - Google Patents
Forming method for mold for lengthy castingInfo
- Publication number
- JPS61182846A JPS61182846A JP2316285A JP2316285A JPS61182846A JP S61182846 A JPS61182846 A JP S61182846A JP 2316285 A JP2316285 A JP 2316285A JP 2316285 A JP2316285 A JP 2316285A JP S61182846 A JPS61182846 A JP S61182846A
- Authority
- JP
- Japan
- Prior art keywords
- sprue
- casting
- blocks
- mold
- sprue part
- 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.)
- Granted
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、板状体や柱状体等のように、断面積に比し長
さの長い鋳造品の鋳造に適した鋳型の造型方法に関する
。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for making a mold suitable for casting cast products having a long length compared to the cross-sectional area, such as a plate-shaped body or a columnar body. .
鋳造品の鋳造において、健全な鋳造品質を確保するには
、目的とする鋳造品の形状に応じた適切な温度勾配を与
えて指向性凝固を行わせることが必要である。In casting a cast product, in order to ensure sound casting quality, it is necessary to provide an appropriate temperature gradient depending on the shape of the intended cast product to perform directional solidification.
従来より、砂型鋳型を用いて、断面積に比し長さの長い
板状体や柱状体等(以下、「長尺鋳造品)を鋳造する場
合には、鋳造品にメタルパッドと称される駄肉を付ける
ことにより所要の温度勾配をもたせるのが一般的であり
、従ってその鋳型の造型においては、鋳造品形成部は所
要の駄肉厚さを見込んだ形状・サイズに造型されている
。特に鋳鋼のように凝固過程での収縮率の大きい合金か
らなる鋳造品の鋳造では、製品内部での引は巣の発生を
防止し、健全な鋳造品を得るうえで、駄肉を省略するこ
とができない。Conventionally, when casting plate-shaped bodies, columnar bodies, etc. that are long in length compared to their cross-sectional area (hereinafter referred to as "long casting products") using sand molds, a metal pad called a metal pad is added to the cast product. It is common to create a required temperature gradient by adding dead wall thickness, and therefore, when molding the mold, the casting part is molded into a shape and size that takes into account the required dead wall thickness. Particularly when casting products made of alloys that have a high shrinkage rate during the solidification process, such as cast steel, it is important to eliminate waste material in order to prevent the formation of shrinkage cavities inside the product and obtain a sound cast product. I can't.
しかしながら、鋳造品に駄肉を付けることは、それだけ
鋳造歩留まりが低下することを意味し、また後工程にお
いて、駄肉を除去し所定の形状に仕上げるための切削加
工等が必要となる等、工程上の無駄と経済的損失が非常
に大きい。However, adding dead metal to a cast product means that the casting yield decreases accordingly, and in the post-process, cutting work is required to remove the dead metal and finish it into a predetermined shape. The waste and economic loss is huge.
本発明は、上記の問題を解決するために、メタルパッド
を付加することなく、内部品質のすぐれた長尺鋳造品を
鋳造するための鋳型の造型方法を提供するものである。In order to solve the above-mentioned problems, the present invention provides a mold making method for casting a long casting product with excellent internal quality without adding a metal pad.
本発明の鋳型の造型方法は、長尺柱状の湯口部と、該湯
口部に対してほぼ対称に位置して上下方向に延在する複
数個の長尺鋳造品形成部と、該湯口から各長尺鋳造品形
成部に放射状に派出する複数個の堰部とを有する鋳型の
上記湯口部と各堰部とを、予め成形されている断熱また
は発熱断熱材からなる複数個のブロックにて造型するこ
とを特徴とするものである。The mold making method of the present invention includes: a long columnar sprue; a plurality of long cast product forming parts that are located approximately symmetrically with respect to the sprue and extend in the vertical direction; The sprue part and each weir part of the mold having a plurality of weir parts extending radially from the long casting product forming part are formed using a plurality of blocks made of pre-formed heat insulating or exothermic heat insulating material. It is characterized by:
本発明によれば、湯口部および堰部の所定の形状に応じ
て予め成形された複数個のブロックを1組とし、これを
木型または金型模型と共に所定の位置に組み込み、1組
のブロックの組合わせにより湯口部と堰部とを造型し、
鋳造品形成部を含む外周部は砂型として造型される。そ
の造型手順は1組めブロックを用いる点を除いて、通常
のそれと異ならない。むろん、鋳造品形成部は、駄肉を
省略した形状・サイズに造型される。造型の後、模型を
抜型して鋳造に供される。According to the present invention, a plurality of blocks pre-formed according to the predetermined shapes of the sprue part and the weir part are made into one set, and this is assembled in a predetermined position together with a wooden mold or a metal mold model, and one set of blocks is formed. The sprue part and weir part are formed by the combination of
The outer periphery including the casting forming part is molded as a sand mold. The molding procedure is no different from the usual one, except that the first set of blocks is used. Of course, the casting part is molded to a shape and size that eliminates the waste material. After molding, the model is cut out and used for casting.
本発明により造型される鋳型を用いた鋳造においては、
湯口部および堰部を形成するブロックが湯口部および堰
部内の金属溶湯に対する保温作用をなし、また、湯口部
の周囲は鋳造品形成部により囲まれているので湯口部の
放冷面が少なく、かつ鋳造品形成部内の金属溶湯が湯口
部および堰部内の金属溶湯に対する保温作用をなす。従
って、湯口、堰部の金属溶湯は凝固が著しく遅延し、堰
部を通じて鋳造品形成部に対する押湯としての役目を果
たすとともに、鋳造品はその外周の砂型部から冷却が始
まり、湯口部に向かう指向性凝固をとる。これにより、
鋳造品は長尺体、例えば断面径の約4倍以上の長さを存
するものであっても、メタルパッドなしで、引は巣を生
じることなく凝固を完了する。In casting using a mold made according to the present invention,
The blocks that form the sprue and weir function to insulate the molten metal within the sprue and weir, and since the sprue is surrounded by the casting forming part, there is little cooling surface at the sprue. In addition, the molten metal in the casting forming section acts to insulate the molten metal in the sprue and weir. Therefore, the solidification of the molten metal at the sprue and weir is significantly delayed, and it serves as a feeder for the casting forming part through the weir, and the casting begins to cool from the sand mold part on its outer periphery and moves toward the sprue. Take directional coagulation. This results in
Even if the cast product is a long body, for example, one whose length is about four times or more than the cross-sectional diameter, solidification can be completed without the need for a metal pad and without causing any shrinkage cavities.
本発明に使用されるブロックを構成する断熱材としては
、アルミナ繊維、岩綿、アスベスト繊維、シリカ繊維、
ムライト繊維、ガラス繊維、カーボン繊維等の無機繊維
、またはパルプ等の有機繊維、あるいはこれらの無機ま
たは有機繊維の1種もしくは2種以上と珪砂、アルミナ
、シャモット、マグネシア、ジルコン、クロマイト等の
耐火材料粉末の1種または2種以上との混合物(例えば
、無機または有機繊維10〜50重景%)等が挙げられ
る。Insulating materials constituting the block used in the present invention include alumina fiber, rock wool, asbestos fiber, silica fiber,
Inorganic fibers such as mullite fibers, glass fibers, and carbon fibers, or organic fibers such as pulp, or one or more of these inorganic or organic fibers and fire-resistant materials such as silica sand, alumina, chamotte, magnesia, zircon, and chromite. Examples include one type or a mixture of two or more types of powders (for example, 10 to 50% by weight of inorganic or organic fibers).
また、発熱断熱材としては、上記の無機もしくは有機繊
維の1種ないしは2種以上、あるいはこれと耐火材料粉
末の1種ないしは2種以上の混合物に、発熱反応材料、
例えばアルミニウム粉末と酸化鉄とからなるテルミット
反応混合物を、必要な発熱量に応じて適量配合したもの
が挙げられる。The exothermic heat insulating material may include one or more of the above-mentioned inorganic or organic fibers, or a mixture of one or more of the above inorganic or organic fibers and refractory material powder, and an exothermic reactive material.
For example, a thermite reaction mixture consisting of aluminum powder and iron oxide may be blended in an appropriate amount depending on the required calorific value.
これらの原料に、必要に応じて結合剤としてフェノール
樹脂等の有機レジンや水ガラス等を適量配合し、所望の
形状に加圧成形したのち、加熱乾燥ないしは焼成するこ
とによりブロックとして仕上げられる。These raw materials are blended with an appropriate amount of organic resin such as phenol resin, water glass, etc. as a binder if necessary, pressure molded into the desired shape, and then finished as a block by heating and drying or firing.
本発明の実施例について図面を参照して説明すると、第
1図は円柱状鋳造品の鋳造用鋳型の造型例であり、(1
0)はブロック、(20)は砂型部、(30)は外枠体
である。(a)は4つのブロック(10)により造型さ
れた湯口部、(b)は同じく4つのブロック(10)で
造型された堰部であり、(C)は砂込めにより造型され
た鋳造品形成部である。Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a molding example of a casting mold for a cylindrical casting product.
0) is a block, (20) is a sand mold part, and (30) is an outer frame body. (a) is a sprue part formed by four blocks (10), (b) is a weir part also formed by four blocks (10), and (C) is a casting formed by sand filling. Department.
各ブロック(10)は同じ形状を有し、それぞれ湯口部
に面して円柱状湯口(a)の周面の一部をなす円弧面部
(1))と、堰部(b)の片側の面を成す平面部(12
)とを備えている。Each block (10) has the same shape, and each has an arcuate surface (1) that faces the sprue and forms part of the circumferential surface of the cylindrical sprue (a), and a surface on one side of the weir (b). The plane part (12
).
4つのブロック(10)は、湯口部(a)の上下方向の
軸心に対称に位置してそれぞれの円弧面部(1))によ
り上下方向に延在する長尺円柱状湯口部(a)を画成し
、円弧面部(1))の両側の平面部(12)は相隣する
ブロックの平面部(12)と相対面して4つの堰部(b
)を画成している。また、各堰部(b)のそれぞれを介
して湯口部(a)と連通ずる4つの鋳造品形成部(c)
は、湯口部(a)に対称に位置して上下方向に延在する
。なお、湯口部(a)が長尺であるというのは、長尺の
鋳造品の鋳造に必要な上下方向の長さを有するという程
の意味である。また、湯口部(a)と鋳造品形成部(c
)とをつなぐ基部(b)は、図示のように鋳造品形成部
(c)の底部(cl)から頂部(c2)付近に到るほぼ
全長にわたって上下方向に延在するように形成されてい
るが、必ずしもその必要はな(、例えば底部(cl)か
ら、鋳造品形成部(c)のほぼ中央部付近までの高さで
あってもよい。The four blocks (10) are arranged symmetrically with respect to the vertical axis of the sprue (a) and extend vertically with their respective arcuate surfaces (1). The flat parts (12) on both sides of the arcuate part (1) face the flat parts (12) of adjacent blocks, and form four weir parts (b
). In addition, four casting product forming parts (c) communicate with the sprue part (a) through each of the weir parts (b).
are located symmetrically to the sprue portion (a) and extend in the vertical direction. Note that the sprue portion (a) is long in the sense that it has a length in the vertical direction necessary for casting a long casting product. In addition, the sprue part (a) and the casting part forming part (c
) is formed to extend in the vertical direction over almost the entire length from the bottom (cl) to the vicinity of the top (c2) of the casting forming part (c), as shown in the figure. However, this is not necessarily necessary (for example, the height may be from the bottom (cl) to approximately the center of the casting forming part (c)).
第2図は、3個のブロック(10)を湯口部(a)の軸
心まわりに対称に配置し、各ブロックの円弧面部(1)
)により湯口部(a)を画成するとともに、円弧面部(
1))につづく平面部(12)にて3つの基部(b)を
画成し、各基部(b)のそれぞれに砂型による円形断面
を有する鋳造品形成部(c)を造型した例である。In Figure 2, three blocks (10) are arranged symmetrically around the axis of the sprue (a), and each block has an arcuate surface (1).
) defines the sprue part (a), and the arc surface part (
This is an example in which three bases (b) are defined by the plane part (12) following 1)), and each base (b) is molded with a casting part (c) having a circular cross section formed by a sand mold. .
第3図は、4個のブロック(10)を用い、上記と同じ
ように湯口部(a)および4つの基部(b)を画成し、
各基部(b)のそれぞれに矩形断面を有する鋳造品形成
部(C)を砂型により造型した例である。FIG. 3 shows that four blocks (10) are used to define a sprue (a) and four bases (b) in the same manner as above;
This is an example in which a cast product forming part (C) having a rectangular cross section on each base part (b) is molded using a sand mold.
各ブロック(10)は、基部を画成する平面部(12)
につづく壁部(13)を有しく第1図、第2図の例では
円弧状壁部、第3図の例では平面壁部)、それらの壁部
(13)は基部(b)につづく鋳造品形成部(C)の壁
面の一部となっている。このことは、鋳造品の基部(b
)付近の領域に対する保温効果が得られる点で有利であ
るが、鋳造条件によっては必ずしも必要ではなく、鋳造
品形成部(C)の全周面を砂型で画成してもよい。なお
、各ブロック(10)の背部壁面(14)は図示のよう
に平面とするかわりに、例えば湯口部(a)の円形断面
と同心円をなす円弧面などの形状であってもよい。Each block (10) has a planar portion (12) defining a base.
1 and 2, and a planar wall in the example of FIG. 3), these wall portions (13) are continuous with the base (b). It is part of the wall surface of the casting forming part (C). This means that the base of the casting (b
) It is advantageous in that a heat insulation effect can be obtained for the surrounding area, but depending on the casting conditions, it is not always necessary, and the entire circumferential surface of the casting forming part (C) may be defined by a sand mold. Note that the back wall surface (14) of each block (10) may have a shape such as a circular arc surface concentric with the circular cross section of the sprue (a), instead of being flat as shown.
湯口部(a)のまわりに形成される鋳造品形成部の数は
任意であるが、通常3〜7個程度とすることができる。The number of casting parts formed around the sprue part (a) is arbitrary, but can usually be about 3 to 7 parts.
使用されるブロックの形状および個数は、鋳造品形成部
の個数に応じて決められる。The shape and number of blocks used are determined depending on the number of casting parts.
通常は図示の例にも示すように、鋳造品形成部(C)の
造型個数とブロックの個数とは同じであるが、ブロック
の成形工程上、または造型の都合上、必要であれば、各
ブロックを複数に分割してよい。例えば、第1図〔、l
〕において、破線(1)で示す部分を分割面として2分
割し、各分割体を分割面で型合わせして使用してよく、
また図示はしないが各ブロックを上半部と下半部の2つ
に分割し、各分割体を上下につなぎ合わせて使用するこ
ともできる。むろん分割数は2つに限らず、必要により
3分割ないしはそれ以上に分割してよい。Normally, as shown in the illustrated example, the number of molded parts of the cast product forming part (C) and the number of blocks are the same, but if necessary in the block molding process or for molding convenience, each number may be different. A block can be divided into multiple parts. For example, Fig. 1 [,l
], the part shown by the broken line (1) may be divided into two parts as the dividing plane, and each divided body may be used by matching the shapes on the dividing plane,
Although not shown, each block may be divided into two halves, an upper half and a lower half, and each divided body may be connected vertically for use. Of course, the number of divisions is not limited to two, but may be divided into three or more if necessary.
本発明により造型された鋳型を用いる鋳造においては、
湯口部の鋳造金属の凝固が遅延し、鋳造品形成部内の鋳
造金属に対する押湯として働き、鋳造品はその外周の砂
型部から冷却を始め、湯口部に向かう指向性凝固をとる
。従って、メタルパッドを付加することなく、引は巣の
ない健全な鋳造品が得られる。In casting using a mold made according to the present invention,
The solidification of the cast metal at the sprue is delayed and acts as a feeder for the cast metal in the casting forming section, and the casting begins to cool from the sand mold section on its outer periphery and undergoes directional solidification toward the sprue. Therefore, a sound cast product without any cavities can be obtained without adding a metal pad.
また、湯口部や基部は予め成形されたブロックにより造
型されるので、造型作業が非常に簡単であり、しかもブ
ロックの組合わせにより鋳造品の長さを自由に変えるこ
とができ、鋳造方案の変更に容易に対処することができ
る。なお、湯口部のまわりに複数の鋳造品形成部が造型
されるので、1回の鋳造作業で複数個の鋳造品を得るこ
とができ、生産性にすぐれ、経済的にも有利である。In addition, since the sprue and base are molded using pre-formed blocks, the molding process is very simple, and the length of the cast product can be changed freely by combining blocks, allowing for changes in casting methods. can be easily dealt with. In addition, since a plurality of casting parts are formed around the sprue, a plurality of casting parts can be obtained in one casting operation, which is highly productive and economically advantageous.
第1図(1)は本発明による鋳型造型例を示す平面説明
図、同図(ff)は造型された各部形状を示す立面形状
図、第2図および第3図は本発明による鋳型造型の他の
例を示す平面説明図である。
10ニブoyり、20:砂型、a:湯口部、b=堰堰部
C:鋳造品形成部。FIG. 1 (1) is a plan explanatory view showing an example of mold manufacturing according to the present invention, FIG. 1 (ff) is an elevational view showing the shape of each molded part, and FIGS. It is a plane explanatory view which shows another example. 10 nibs, 20: sand mold, a: sprue part, b = weir dam part C: casting product forming part.
Claims (1)
柱状の湯口部と、該湯口部に対してほぼ対称に位置して
上下方向に延在する複数個の長尺鋳造品形成部と、該湯
口から各長尺鋳造品形成部に放射状に派出する複数個の
堰部とを有する鋳型の上記湯口部と各堰部とを、予め成
形されている断熱または発熱断熱材からなる複数個のブ
ロックにて造型することを特徴とする長尺鋳造品鋳造用
鋳型の造型方法。(1) A method for manufacturing a mold for casting long cast products, which includes a long columnar sprue and a plurality of long cast products that are located approximately symmetrically with respect to the sprue and extend in the vertical direction. The sprue part and each weir part of the mold having a forming part and a plurality of weir parts radially extending from the sprue to each elongated casting part forming part are made of pre-formed heat insulating or heat generating heat insulating material. A method for making a mold for casting a long casting product, which is characterized by making a mold using a plurality of blocks.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2316285A JPS61182846A (en) | 1985-02-07 | 1985-02-07 | Forming method for mold for lengthy casting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2316285A JPS61182846A (en) | 1985-02-07 | 1985-02-07 | Forming method for mold for lengthy casting |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61182846A true JPS61182846A (en) | 1986-08-15 |
JPH0225695B2 JPH0225695B2 (en) | 1990-06-05 |
Family
ID=12102912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2316285A Granted JPS61182846A (en) | 1985-02-07 | 1985-02-07 | Forming method for mold for lengthy casting |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61182846A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4926826A (en) * | 1987-08-31 | 1990-05-22 | Japan Electronic Control Systems Co., Ltd. | Electric air-fuel ratio control apparatus for use in internal combustion engine |
-
1985
- 1985-02-07 JP JP2316285A patent/JPS61182846A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4926826A (en) * | 1987-08-31 | 1990-05-22 | Japan Electronic Control Systems Co., Ltd. | Electric air-fuel ratio control apparatus for use in internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
JPH0225695B2 (en) | 1990-06-05 |
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