JP2589569B2 - Molding method for raw sand core - Google Patents
Molding method for raw sand coreInfo
- Publication number
- JP2589569B2 JP2589569B2 JP1141931A JP14193189A JP2589569B2 JP 2589569 B2 JP2589569 B2 JP 2589569B2 JP 1141931 A JP1141931 A JP 1141931A JP 14193189 A JP14193189 A JP 14193189A JP 2589569 B2 JP2589569 B2 JP 2589569B2
- Authority
- JP
- Japan
- Prior art keywords
- core
- sand
- filling frame
- split
- green sand
- 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 - Fee Related
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】 (産業上の利用分野) 本発明は生砂により複雑な形状の中子を造型するのに
好適な方法に関する。Description: TECHNICAL FIELD The present invention relates to a method suitable for molding a core having a complicated shape using green sand.
(従来技術とその問題点) 従来生砂中子を造型する方法としては、中子箱内に充
填された生砂に対し、略逆錐体状を成す棒部材を挿入し
て前記生砂を圧縮硬化させる方法がとられている。(特
公昭64−9101号公報) しかしこのような方法で型形状の複雑な中子を造型す
る場合にはキャビティー細部にまで生砂が十分に充填さ
れない欠点があり、このような生砂中子の造型方法は単
純な形状の中子の造型に限定されるものであった。(Prior art and its problems) Conventionally, as a method of molding a raw sand core, a raw material filled in a core box is inserted with a rod member having a substantially inverted pyramid shape, and the raw sand is formed. A method of compression hardening is used. However, when a core having a complicated shape is formed by such a method, there is a disadvantage that the fine sand is not sufficiently filled in the cavity details. The method of molding a child was limited to molding a core of a simple shape.
(目 的) 本発明は上記の問題に鑑みて成されたもので複雑な形
状の中子を生砂により造型し得る方法を提供することを
目的とするものである。(Purpose) The present invention has been made in view of the above problems, and has as its object to provide a method capable of molding a core having a complicated shape with green sand.
(問題点を解決するための手段) 本発明は、型合せ面に盛枠を追加した各分割中子箱の
盛枠追加キャビティーに生砂を導入し、該生砂を導入し
た盛枠に対し、外周形状が該盛枠の内面形状に相似され
ると共に底面形状を凹場にされた圧縮部材を、該圧縮部
材の最下端面が前記分割中子箱の型合せ面と同一レベル
になるまで挿入して生砂を1次圧硬化させ、該圧縮部材
及び盛枠を抜き出し分離しもって合せ面が凸状を成す半
割れ生砂中子を分割中子箱に成形し、各半割れ生砂中子
を保持した分割中子箱を型合せ押圧して前記半割れ生砂
中子の凸状部を圧縮接着し、もって一対の半割れ生砂中
子を一体化すると同時に2次圧縮硬化させることを特徴
とするものである。(Means for Solving the Problems) The present invention introduces green sand into the additional frame cavities of each of the divided core boxes in which a filling frame is added to the mold mating surface, and fills the filling frame into which the green sand has been introduced. On the other hand, the compression member whose outer peripheral shape is similar to the inner surface shape of the filling frame and whose bottom surface is concave is formed, and the lowermost end surface of the compression member is at the same level as the mating surface of the divided core box. The green sand is subjected to primary pressure hardening, and the compressed member and the filling frame are extracted and separated to form a half-broken raw sand core having a convex mating surface into divided core boxes. The divided core boxes holding the sand cores are pressed together with the mold, and the convex portions of the half-split raw sand cores are compression-bonded, whereby a pair of half-split raw sand cores are integrated and at the same time secondary compression hardening. It is characterized by the following.
(作 用) 本発明は上記のような解決手段を採用することによ
り、生砂は各分割中子箱のキャビティーの細部にまで十
分に充填された後キャビティー面方向に向って圧縮され
て1次圧縮硬化されると共に合せ面が凸状を成す半割れ
生砂中子とされ、その後各分割中子箱を型合せ押圧する
ことにより分割造型されている生砂中子が一体化される
と共に2次圧縮硬化されて生砂中子が造型されるように
なる。(Operation) In the present invention, by adopting the solution as described above, the green sand is sufficiently filled up to the details of the cavity of each divided core box, and then compressed toward the cavity surface. The primary compression hardening is performed to form a half-broken green sand core having a mating surface that is convex, and then, the divided core boxes are molded and pressed to integrate the green sand core that has been separately molded. At the same time, it is subjected to secondary compression hardening to form a green sand core.
(実施例) 以下本発明の実施例を図面に基づいて詳細に説明す
る。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第2図において、上下に分割可能にされた分割中子箱
(1A)(1B)は型合せされて内周面に複雑なキャビティ
ー面(1a)(1b)を形成するキャビティーを画成するよ
うに構成されている。In FIG. 2, the divided core boxes (1A) and (1B), which can be divided into upper and lower parts, are combined to define a cavity that forms a complex cavity surface (1a) (1b) on the inner peripheral surface. It is configured to be.
このように構成された分割中子箱(1A)の上部に該分
割中子箱(1A)の型合せ面(1C)形状と同一の断面形状
を持った盛枠(2)を載置する。A filling frame (2) having the same cross-sectional shape as the shape of the mating surface (1C) of the divided core box (1A) is placed on the upper part of the divided core box (1A) thus configured.
次に分割中子箱(1A)と盛枠(2)とによって画成さ
れた盛枠追加キャビティーに所定量の生砂を投入する。
この際生砂はキャビティー面(1a)に対して対向する側
から投入されるためキャビティー面(1a)の細部にわた
って充填される。Next, a predetermined amount of green sand is poured into the additional cavity of the filling frame defined by the divided core box (1A) and the filling frame (2).
At this time, the green sand is charged from the side opposite to the cavity surface (1a), so that it is filled over the details of the cavity surface (1a).
次に外周形状を盛枠(2)の内面形状に相似させると
共に底面形状を凹状(3a)にした圧縮部材(3)を、該
圧縮部材(3)の最下端面(3b)が前記分割中子箱(1
A)の型合せ面(1C)と同一レベルになるまで挿入して
生砂に対しキャビティー面(1a)方向に向けて圧力を作
用させ生砂を1次圧縮硬化させる。(第1図(イ)) 次に該圧縮部材(3)を盛枠(2)から抜き出すと共
に盛枠(2)を分割中子箱(1A)から分離する。これよ
り分割中子箱(1A)には外周縁を分割中子箱(1A)の型
合せ面(1C)と同一レベルとすると共に残りの内方部を
上方に突出させた凸状(MC)部を有する半割れ生砂中子
(Ma)を保持した状態になる。Next, the compression member (3) whose outer shape is similar to the inner shape of the filling frame (2) and whose bottom shape is concave (3a) is divided by the lowermost end surface (3b) of the compression member (3) during the division. Child box (1
Insert it until it is at the same level as the mating surface (1C) of A) and apply pressure to the green sand toward the cavity surface (1a) to make the green sand primary compression hardened. (FIG. 1 (a)) Next, the compression member (3) is extracted from the filling frame (2), and the filling frame (2) is separated from the divided core box (1A). From this, the split core box (1A) has the outer peripheral edge at the same level as the mold mating surface (1C) of the split core box (1A) and the remaining inner part protrudes upward (MC). The half-broken raw sand core (Ma) having the part is held.
以上の操作を分割中子箱(1B)についても同様に行な
い分割中子箱(1A)(1B)のそれぞれに半割れ生砂中子
(Ma)(Mb)を保持した状態にする。The above operation is similarly performed for the split core box (1B), so that the split core boxes (1A) and (1B) hold the half-broken raw sand core (Ma) (Mb).
次に半割れ生砂中子(Ma)(Mb)を保持した分割中子
箱(1A)(1B)を第2図(イ)のように型合せした後、
分割中子箱(1A)(1B)を押圧して第2図(ロ)のよう
に型合せ面(1C)が相互に当接するまで半割れ生砂中子
(Ma)(Mb)を圧縮する。この際半割れ生砂中子(Ma)
(Mb)は凸状(Mc)部が一旦崩壊して再び圧縮されるこ
とになり両者は一体化されると同時に2次圧縮硬化され
る。Next, after the split core boxes (1A) (1B) holding the half-broken raw sand cores (Ma) (Mb) are matched as shown in Fig. 2 (a),
Press the split core boxes (1A) and (1B) and compress the half-broken raw sand cores (Ma) (Mb) until the mating surfaces (1C) abut each other as shown in Fig. 2 (b) . At this time, half-broken raw sand core (Ma)
In the case of (Mb), the convex (Mc) portion is once collapsed and compressed again, so that the two are integrated and simultaneously subjected to secondary compression hardening.
次に、慣用手段により分割中子箱(1A)(1B)を分割
すると共に一体になった生砂中子(M)を取り出し、生
砂中子の造型を完了する。Next, the divided core boxes (1A) and (1B) are divided by conventional means, and the integrated green sand core (M) is taken out to complete the molding of the green sand core.
このようにして造型された生砂中子(M)は表面形状
が複雑な場合であっても型形状を正確に転写されると共
に全体が一体化され十分な硬度を有するものであること
が確認された。It was confirmed that the green sand core (M) molded in this way had a sufficient hardness, even when the surface shape was complicated, the mold shape was accurately transferred and the whole was integrated. Was done.
尚、上記実施例では圧縮部材(3)の底面形状を横方
向に長い凹状(3a)にしてあるが第1図(ロ)のように
凹状を多数連続させた波形の凹状(3C)としてもよい。In the above embodiment, the bottom surface of the compression member (3) has a concave shape (3a) which is long in the lateral direction. However, as shown in FIG. Good.
(確認実験) 本発明により造型される生砂中子の接着一体化状況に
ついて確認実験を行なったのでこれについて第3図
(イ)及び第3図(ロ)により説明をする。(Confirmation Experiment) A confirmation experiment was performed on the state of adhesion of the green sand core formed by the present invention, and this will be described with reference to FIGS. 3 (a) and 3 (b).
内径50mmφ×高さ25mmの円筒体(11)(11A)を定盤
(12)(12A)上に取付け、前記実施例と同様にして半
割れ生砂中子(13)(13A)を造型し、両者を型合せし
たのが第3図(イ)であり、ここで第3図(イ)におい
てA寸法を2段階に、B寸法を4段階に変化させたもの
を成形した。この型合せしたものを押圧して半割れ生砂
中子(13)(13A)を一体化したのが第3図(ロ)であ
る。尚図中(14)は円筒体(11A)に取付けられた吊上
げ用ピン、(15)は吊上げ具であり、該吊上げ具(15)
は上部において図示されない引張り用荷重計に接続され
下端は前記ピン(14)に係止されている。A cylindrical body (11) (11A) having an inner diameter of 50mmφ and a height of 25mm is mounted on a surface plate (12) (12A), and a half-broken raw sand core (13) (13A) is formed in the same manner as in the above embodiment. Fig. 3 (a) shows a combination of the two. In Fig. 3 (a), a product was formed in which the dimension A was changed in two steps and the dimension B was changed in four steps. Fig. 3 (b) shows the half-broken green sand cores (13) and (13A) integrated by pressing the molded product. In the drawing, (14) is a lifting pin attached to the cylindrical body (11A), (15) is a lifting device, and the lifting device (15)
Is connected to a tensile load cell (not shown) at the upper part, and the lower end is locked to the pin (14).
このように構成されたものを円筒体(11)を固定した
状態にして引張り上げ力を上昇させてゆくとある点で接
着一体化された生砂中子(M)は接着部分で引きちぎら
れる。このときの引張り力を荷重計で測定すると同時に
生砂中子の凸状(13℃)部が崩れ型合せ面(11C)(11
C)にはみ出す状態を観察した結果が第1表である。尚
生砂中子の密度は最終的に1.5g/cm3になるようにした。With such a structure, the cylindrical body (11) is fixed and the pulling-up force is increased, so that the green sand core (M) bonded and integrated at a certain point is torn off at the bonded portion. The tensile force at this time was measured with a load cell, and at the same time, the convex (13 ° C) portion of the raw sand core collapsed and the mold mating surface (11C) (11
Table 1 shows the results of observation of the state protruding into C). The density of the raw sand core was adjusted to 1.5 g / cm 3 finally.
ここで接着力とは前記引張り力を荷重計で測定した値
を円筒内径50mmの断面積で除し、単位面積当りの接着力
としたものである。また型合せ面への生砂のはみ出しの
評価は次の通りとした。 Here, the adhesive force is a value obtained by dividing a value obtained by measuring the tensile force by a load meter by a cross-sectional area of a cylinder having an inner diameter of 50 mm to obtain an adhesive force per unit area. The evaluation of the run-out of the green sand on the mating surface was as follows.
○:はみ出しなし △:若干はみ出しているが実用上問題なし ×:はみ出し量多く実用不可 以上の結果から生砂中子の凸状(13℃)部A寸法は大
きいほど接着力は増し、型合せ面へのはみ出しも増大す
る傾向にある。:: no protrusion △: slightly protruded, no problem in practical use ×: large amount of protrusion, impractical From the above results, the larger the A dimension of the convex (13 ° C) part of the raw sand core, the higher the adhesive strength, and the matching of the mold The protrusion to the surface also tends to increase.
B寸法は小さくなる程すなわち半割れ生砂中子の初期
接触面積が大きい程接着力は増大し、型合せ面へのはみ
出しも増大する。As the B dimension decreases, that is, as the initial contact area of the half-broken raw sand core increases, the adhesive force increases, and the protrusion to the mating surface also increases.
生砂中子の接着力は、0.05kg/cm2以上あれば生砂中子
のハンドリング等に十分耐えるもとであることから本実
験の範囲のものは全て満足している。If the adhesive strength of the raw sand core is 0.05 kg / cm 2 or more, it can sufficiently handle the handling of the raw sand core.
型合せ面への生砂のはみ出し量からみると半割れ生砂
中子の凸状(11C)部のA、B寸法A≦Bという関係に
あればよいことがわかる。It can be seen from the amount of the protruding green sand protruding from the mold-matching surface that the relationship of A and B of the protruding (11C) portion of the half-broken green sand core should satisfy A ≦ B.
(効 果) 本発明は上記の説明から明らかなように充填がしやす
い状態の分割中子箱が生砂を充填し、これを1次圧縮硬
化させて半割れ生砂中子を成形し、さらにこの半割れ生
砂中子を押圧して2次圧縮硬化して半割れ生砂中の一体
化及び2次圧縮をして中子を造型するようにしたから造
型される中子は中子箱のキャビティーの細部にわたって
生砂が充填されて圧縮されることになり、複雑な形状の
中子であっても型形状を正確に転写されて造型されると
共に強度の高い中子が造型されるというすぐれた効果を
奏する。(Effects) As is clear from the above description, the present invention provides a split core box in a state in which filling is easy, fills green sand, and first-compresses and hardens it to form a half-broken green sand core. Further, the core is molded by pressing the half-broken green sand core to perform secondary compression and hardening to form a core by integrating and secondary compressing the half-broken green sand. Raw sand is filled over the details of the cavity of the box and compressed, and even for cores with complex shapes, the mold shape is accurately transferred and molded, and a core with high strength is molded. Has an excellent effect.
第1図及び第2図は本発明の実施工程を示すものとし
て、第1図(イ)は、半割れ生砂中子の造型状態を示す
断面図、第1図(ロ)は別の圧縮部材を使った半割れ生
砂中子の造型状態を示す断面図、第2図(イ)は半割れ
生砂中子の型合せ状態を示す断面図、第2図(ロ)は半
割れ生砂中子の圧縮状態を示す断面図、第3図(イ)は
確認実験による半割れ生砂中子の型合せ状態を示す断面
図、第3図(ロ)は確認実験による引張り力測定状態を
示す断面図である。 (1A)(1B):分割中子箱、(1C):型合せ面 (2):盛枠、(3):圧縮部材 (3a):凹状、(Ma)(Mb):半割れ生砂中子 (M):生砂中子、(Mc):凸状FIGS. 1 and 2 show the process of the present invention. FIG. 1 (a) is a sectional view showing a molding state of a half-split raw sand core, and FIG. 1 (b) is another compression. FIG. 2 (a) is a cross-sectional view showing a molding state of a half-split raw sand core using a member, FIG. 2 (a) is a cross-sectional view showing a mold-matching state of a half-split raw sand core, and FIG. Sectional view showing the compressed state of the sand core, FIG. 3 (a) is a sectional view showing the matching state of the half-broken raw sand core by the confirmation experiment, and FIG. 3 (b) is the tensile force measurement state by the confirmation experiment FIG. (1A) (1B): Split core box, (1C): Molding surface (2): Filling frame, (3): Compressed member (3a): Concave, (Ma) (Mb): Half cracked green sand Child (M): Raw sand core, (Mc): Convex
Claims (1)
盛枠追加キャビティーに生砂を導入し、該生砂を導入し
た盛枠に対し、外周形状が該盛枠の内面形状に相似され
ると共に底面形状を凹状にされた圧縮部材を、該圧縮部
材の最下端面が前記分割中子箱の型合せ面と同一レベル
になるまで挿入して生砂を1次圧縮硬化させ、該圧縮部
材及び盛枠を抜き出し分離し、もって合せ面が凸状に成
す半割れ生砂中子を分割中子箱に成形し、各半割れ生砂
中子を保持した分割中子箱を型合せ押圧して前記半割れ
生砂中子の凸状部を圧縮接着しもって一対の半割れ生砂
中子を一体化すると同時に2次圧縮硬化させることを特
徴とする生砂中子の造型方法。1. A fresh sand is introduced into a filling frame addition cavity of each divided core box having a filling frame added to a molding surface, and an outer peripheral shape of the filling frame into which the green sand is introduced is the same as that of the filling frame. Primary compression of green sand by inserting a compression member similar to the inner surface shape and having a concave bottom shape until the lowermost surface of the compression member is at the same level as the mating surface of the split core box. After curing, the compression member and the filling frame are extracted and separated, and a half-split raw sand core having a mating surface formed in a convex shape is formed into a split core box, and a split core holding each half-split raw sand core. A box which is molded and pressed to compressively bond the convex portions of the half-broken green sand core to unite a pair of half-broken green sand cores and to simultaneously perform secondary compression hardening. Molding method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1141931A JP2589569B2 (en) | 1989-06-02 | 1989-06-02 | Molding method for raw sand core |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1141931A JP2589569B2 (en) | 1989-06-02 | 1989-06-02 | Molding method for raw sand core |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH038535A JPH038535A (en) | 1991-01-16 |
JP2589569B2 true JP2589569B2 (en) | 1997-03-12 |
Family
ID=15303482
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1141931A Expired - Fee Related JP2589569B2 (en) | 1989-06-02 | 1989-06-02 | Molding method for raw sand core |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2589569B2 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6095933B2 (en) * | 2012-10-09 | 2017-03-15 | 三菱日立パワーシステムズ株式会社 | Precision casting mold manufacturing method |
JP6095934B2 (en) * | 2012-10-09 | 2017-03-15 | 三菱日立パワーシステムズ株式会社 | Precision casting mold manufacturing method |
JP6199019B2 (en) * | 2012-10-09 | 2017-09-20 | 三菱日立パワーシステムズ株式会社 | Precision casting mold manufacturing method |
JP6199018B2 (en) * | 2012-10-09 | 2017-09-20 | 三菱日立パワーシステムズ株式会社 | Precision casting mold manufacturing method |
JP6095935B2 (en) * | 2012-10-09 | 2017-03-15 | 三菱日立パワーシステムズ株式会社 | Precision casting mold manufacturing method |
CN103962511B (en) * | 2014-05-13 | 2016-03-02 | 淄博华成泵业有限公司 | A kind of preparation method of Unitary Impeller core |
CN108115098A (en) * | 2018-01-02 | 2018-06-05 | 繁昌县金牛机械铸造有限责任公司 | A kind of sand casting mud core |
CN110877095B (en) * | 2019-09-06 | 2024-03-26 | 江苏力源金河铸造有限公司 | Processing technology of engineering machinery end cover casting |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63238945A (en) * | 1987-03-26 | 1988-10-05 | Sintokogio Ltd | Apparatus for molding green sand core |
-
1989
- 1989-06-02 JP JP1141931A patent/JP2589569B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH038535A (en) | 1991-01-16 |
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