JPS59107748A - Core molding method - Google Patents

Core molding method

Info

Publication number
JPS59107748A
JPS59107748A JP21742482A JP21742482A JPS59107748A JP S59107748 A JPS59107748 A JP S59107748A JP 21742482 A JP21742482 A JP 21742482A JP 21742482 A JP21742482 A JP 21742482A JP S59107748 A JPS59107748 A JP S59107748A
Authority
JP
Japan
Prior art keywords
cavity
green sand
sand
core
open
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.)
Pending
Application number
JP21742482A
Other languages
Japanese (ja)
Inventor
Nagato Unosaki
鵜崎　永人
Shigeru Ito
滋 伊藤
Ryoji Kanayama
金山　良治
Hisashi Harada
久 原田
Yasutaro Kawamura
安太郎 河村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sintokogio Ltd
Shinto Industrial Co Ltd
Original Assignee
Sintokogio Ltd
Shinto Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sintokogio Ltd, Shinto Kogyo KK filed Critical Sintokogio Ltd
Priority to JP21742482A priority Critical patent/JPS59107748A/en
Publication of JPS59107748A publication Critical patent/JPS59107748A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/02—Compacting by pressing devices only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)

Abstract

PURPOSE:To compress and harden the entire part of green sand and to mold a green sand core having an intricate shape by packing the green sand in the cavity of a core box having open end face parts in >=2 places, and inserting a bar member having the tip formed into approximately an inverted cone shape through >=1 open parts and a pressing member through the other open part. CONSTITUTION:An auxiliary member 4 having the same auxiliary cavity 3 of which the internal size is the same as that of an open bottom end 1b is concentrically attached to the bottom surface of a core box 2 of vertically split molds having an open top end 1a and the open bottom end 1b. Green sand S is packed in cavities 1, 3 and a bar member 5 having the tip formed into an approximately inverted conical shape is inserted into the cavity through the end 1a to compress the sand S by 10-50%; at the same time, a pressing member 6 is fitted into the cavity 3 of the member 4 to force the sand S in the cavity 3 into the cavity 1. The sand S is compressed and hardened in such a way and thereafter the member 5 and the member 6 are removed and the core box is opened, whereby a hollow-shaped core is obtd. The resulted core has a good shape retentivity, a good collapsing property and vents satisfactorily gas.

Description

【発明の詳細な説明】 本発明は複雑な形状の生砂中子を造型する方法に関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding green sand cores of complex shapes.

鋳物砂の管理や鋳型の後処理あるいは鋳物砂の循環使用
等の観点から中子は主型と同一の生砂により造型される
のが望ましく、このため生砂を使用（７て中子を造型す
ることが試みられてきたが、生砂は流動性・充填性が悪
いため複雑な形状の中子を造型することがなかなかむず
かしいという問題があった。From the viewpoints of foundry sand management, post-processing of molds, and circulation of foundry sand, it is desirable to mold the core with the same green sand as the main mold.For this reason, green sand is used (7) However, green sand has poor fluidity and filling properties, making it difficult to mold cores with complex shapes.

本発明は上記の事情に鑑みなされたもので、以下、本発
明の実施例について図面に基づき詳細に説明する。The present invention has been made in view of the above circumstances, and embodiments of the present invention will be described in detail below with reference to the drawings.

第１図に示すように、上下方向に指向する空洞（１）を
有しかつ該空洞（１）の上端開口（ｌａ）および下端開
口（１ｂ）をその上面および下面にそれぞれ有する垂直
割型中子箱（２）の下面に、内寸が下端開口（１ｂ）の
それと同一である補助空洞（３）を有する補助部材（４
）を、補助空洞（３）を下端開口（１ｂ）に同心させて
取付け、これらの空洞（１）　（３）内に、圧縮空気に
よる吹込み、１然落下による装入、または中子箱（２）
に振動を与えながらの投入によって生砂（Ｓ）を充填し
、続いて上端開口（１ａ）から先端が略逆錐体状を成す
棒部材（５）を挿入して生砂（Ｓ）を圧縮し硬化せしめ
るとともに、抑圧部材（６）を補助部材（４）の補助空
洞（３）に嵌入して補助空洞（３）内の生砂（Ｓ）を空
洞（１）内に押し込む。As shown in FIG. 1, a vertically split mold having a cavity (1) oriented in the vertical direction and having an upper end opening (la) and a lower end opening (1b) of the cavity (1) on its upper and lower surfaces, respectively. An auxiliary member (4) having an auxiliary cavity (3) on the lower surface of the child box (2) whose internal dimensions are the same as that of the lower end opening (1b).
) are installed with the auxiliary cavity (3) concentric with the lower end opening (1b), and the core box ( 2)
The green sand (S) is filled by adding the green sand (S) while applying vibration, and then the rod member (5) whose tip is approximately in the shape of an inverted cone is inserted from the upper end opening (1a) to compress the green sand (S). At the same time, the suppressing member (6) is fitted into the auxiliary cavity (3) of the auxiliary member (4) to force the green sand (S) in the auxiliary cavity (3) into the cavity (1).

この場合、前記棒部材（５目よ、空洞（１）への生砂（
Ｓ）の充填を吹込方式で行うときにはを洞（１）内に挿
入される部分の体積が空洞（１）の容積に対し１０〜３
０％を占めるように構成されろことが望ましく、篩かけ
自然落下方式で行うときには２５〜５０％を占めるよう
に構成されることが望ましい。この範囲の下限に満たな
いと、生砂（Ｓ）を隅々まで硬化させることができず、
また上限を越えると生砂（Ｓ）を圧縮し過ぎて造型きれ
る中子は通気性が低下し、崩壊性が悪くなる。このよう
にして生砂（Ｓ）を圧縮硬化したのち棒部材（５）と押
圧部材（６）を抜き出し、中子箱（２）を開くと、中空
状の中子を得ることができる。この中子は表面から内部
まで圧縮硬化されて所要の強度と表面安定性を備えてい
るため取扱が容易であり、しかも中空状を成しているた
めガス抜き性および崩壊性が良い。In this case, the rod member (the 5th one, the raw sand (
When S) is filled by blowing, the volume of the part inserted into the cavity (1) is 10 to 3 times the volume of the cavity (1).
It is desirable that the amount is 0%, and when using the sieving gravity method, it is desirable that the amount is 25 to 50%. If the lower limit of this range is not reached, green sand (S) will not be able to harden in every corner.
Moreover, if the upper limit is exceeded, the green sand (S) will be compressed too much, and the molded core will have low air permeability and poor collapsibility. After compressing and hardening the green sand (S) in this way, the rod member (5) and the pressing member (6) are extracted and the core box (2) is opened to obtain a hollow core. This core is compression hardened from the surface to the inside and has the necessary strength and surface stability, so it is easy to handle, and since it is hollow, it has good degassing and disintegration properties.

なお、上記の実施例では、棒部材（５）を挿入する上端
開口（１１１）と中心線を同じくする下端開口（１ｂ）
に対して抑圧部材（６）により生砂（Ｓ）を押し込むよ
うにしているが、次のように棒部材を挿入する開口と中
心線を異にする他の開口、例えば中心線が互いに直交す
る開口に対して押圧部材により生砂を押し込むようにし
てもよい。すなわち、第２図に示すように、横向きＴ字
状の空洞（２１）を有し、かつ該空洞（２１）の上端開
口（２１ａ）　、下端開口（２１ｂ）　ｉよび右端開口
＜２１’ｃ　）を、その上面、下面および右側面にそれ
ぞれ有する垂直割型中子箱（２２）の右側面に、内寸が
右端開口（２１ｆｉ）のそれと同一である補助空洞（２
３）を有する補助部材（２４）を取付け、上記実施例と
同様にしてこれらの空洞（２１）　（２３）に生砂（Ｓ
）を充填したのち上、下端開口（２１１１）　（２１ｂ
）から棒部材（２５）　（２６）　ｆ　仲人して空洞（
２１）内の生砂（Ｓ）を圧縮硬化させるとともに抑圧部
材（２７）を補助空洞（２３）に嵌入して補助空洞（２
３）内の生砂（Ｓ）を空洞（２１）内に押し込むように
してもよい。さらに、第３図に示すように、十字状の空
洞（３１）を有しかつ該空洞（３１）の上端開口（３１
ｍ）をその上ｂ１１にイイするとともに前記補助空洞（
３）（２３）に相当する補助を洞（３１ｂ）　（３１ｃ
）を一体的に設け１その内端が空洞（３１）に連通する
連通開口空洞（３１ａ）　（３１ｅ）をそ６成する垂直
割型中子箱′４（３２）における当該空洞（３１）　（
３１ｂ）　（３１ｃ）　（３１ｄ）　（３１ｅ）内に、
上記実施例と同様にして生砂（Ｓ）を充填したのち、空
洞（３１）の形状に対応して段付状を成す棒部材（３３
）を上端開口（３１ａ）から押入して空洞（３１）内の
生砂（Ｓ）を圧縮するとともに、先端部が空洞（３１）
の壁面の一部を成すように形成された押圧部材（３４）
　（３５）を補助空洞（３１ｂ）　（３１Ｃ）からそれ
ぞれ所要長さ嵌入して生砂（Ｓ）を連通開口空洞（３１
ｄ）（３］ｅ）に向けて押し込むようにしてもよい。こ
の場合、特に第３図の連通開口空洞（３１ｄ）　（３１
ｅ）のように細長く突出して生砂（Ｓ）が詰まりにくい
箇所または棒部材（２５）　（２６）の挿入が不適当な
箇所に対して非常に有効である。In addition, in the above embodiment, the lower end opening (1b) has the same center line as the upper end opening (111) into which the rod member (5) is inserted.
The green sand (S) is pushed in by the suppressing member (6), but as shown below, there are other openings whose center lines are different from the opening into which the bar member is inserted, for example, whose center lines are orthogonal to each other. The green sand may be pushed into the opening by a pressing member. That is, as shown in FIG. 2, it has a horizontally T-shaped cavity (21), and the cavity (21) has an upper end opening (21a), a lower end opening (21b) i, and a right end opening <21'c). On the right side of the vertically split core box (22), which has on its top, bottom, and right side, respectively, an auxiliary cavity (2
3), and fill these cavities (21) and (23) with green sand (S
) After filling the upper and lower end openings (2111) (21b
) to the rod member (25) (26) f Matchmaker and hollow (
The green sand (S) in the auxiliary cavity (21) is compressed and hardened, and the suppressing member (27) is fitted into the auxiliary cavity (23).
3) The green sand (S) inside may be pushed into the cavity (21). Further, as shown in FIG. 3, it has a cross-shaped cavity (31) and an upper opening (31) of the cavity (31).
m) to b11 above and the auxiliary cavity (
3) Add support corresponding to (23) to the hole (31b) (31c
) in the vertically split core box '4 (32), which has communicating opening cavities (31a) (31e) whose inner ends communicate with the cavity (31).
31b) (31c) (31d) (31e),
After filling green sand (S) in the same manner as in the above embodiment, the bar member (33) is formed into a stepped shape corresponding to the shape of the cavity (31).
) is pushed through the upper end opening (31a) to compress the green sand (S) in the cavity (31), and the tip part is inserted into the cavity (31).
A pressing member (34) formed to form a part of the wall surface of
(35) are inserted into the auxiliary cavities (31b) and (31C) to the required length, respectively, and green sand (S) is communicated with the opening cavity (31).
d) You may push it toward (3) e). In this case, especially the communicating opening cavity (31d) (31
It is very effective for places like e) where the green sand (S) protrudes in a long and narrow manner and is difficult to clog, or where it is inappropriate to insert the rod members (25) (26).

また、第２図および第３図に示すように、中子箱（２２
）　（３２）の上面および下面に１．同寸が上端開口（
２１ａ）　（２１ｂ）　（３１ａ）のそれと同一である
補助空洞（４１）　（４２）　（４３）を有する補助部
材（４４）　（４５）　（４６）を、詠補助空洞（４１
）　（４２）　（４３）を上・下端開口（２１ａ）（２
１ｂ）　（３１１にそれぞれ同心させて取付けて空洞（
２１）　（３１）に生砂（Ｓ）を充填する際には当該補
助空洞（４１）　（４２）　（Δ３）にも充填するよう
にする。そして、生砂（Ｓ）が充填された空洞（２１）
　（３１）に棒部材（２５）（２６）　（３３）を挿入
したのち、第２図に示す場合にあ−）　でＬｉ　Ｉｆｉ
　ｕ材（２５）　（２６）（７）　抑圧部（２５ａ　＞
　（２６ａ）　ｙｉｅ　補助空洞（４Ｄ　（４２）に（
■入し、第３図に示す場合にあっては抑圧部材（４７）
を補助空洞（４３）に嵌入して補助空洞（４１）　（４
２）　（４３）の生砂（Ｓンを空洞（２１）　（３１）
内に押し込むようにしてもよい。こうして造型された中
子は、上端部、下端部および右端部も非常に硬度が高い
。In addition, as shown in Figures 2 and 3, a core box (22
) (32) 1. The same size is the top opening (
21a) (21b) The auxiliary members (44) (45) (46) having auxiliary cavities (41) (42) (43) which are identical to those of (31a) are replaced with the auxiliary cavities (41).
) (42) (43) into upper and lower end openings (21a) (2
1b) (Attach each concentrically to 311 and make a cavity (
21) When filling green sand (S) into (31), the corresponding auxiliary cavities (41), (42), and (Δ3) should also be filled. And a cavity (21) filled with green sand (S)
After inserting the rod members (25), (26), and (33) into (31), in the case shown in Fig. 2, Li Ifi is
U material (25) (26) (7) Suppression part (25a >
(26a) yie auxiliary cavity (4D (42) (
■ In the case shown in Fig. 3, the suppression member (47)
into the auxiliary cavity (43) to form the auxiliary cavity (41) (4
2) (43) green sand (Sun hollow (21) (31)
It may be pushed inward. The core formed in this manner also has extremely high hardness at the upper end, lower end, and right end.

さらに、上記実施例では空洞（１）　（２１）　（３１
）にストレート状の棒部材（５）　（２５）　（２６）
　（３３）を押入するようにしているか、テーパー状の
棒部材を挿入するようにしてもよい。Furthermore, in the above embodiment, the cavities (1) (21) (31
) with straight rod members (5) (25) (26)
(33) may be pushed in, or a tapered rod member may be inserted.

以上の説明からも明らかなように本：発明は、生砂を充
填した中子箱の空洞丙に、一方から所定の太さの棒部材
を挿入するとともに他方から抑圧部材により生砂を押し
込んで生砂を圧縮硬化させるようにしたから、造型され
た中子は保形性が良くて取扱上便利でゐり、しかも中空
状になっているので注湯後の崩壊性が非常に良い上にガ
ス抜きも良く、さらに、＠型に手数を要しないため中子
を安価に提供できる利点と相俟ち、在来の生砂による中
子造型方法の問題点を解決した中子造型方法として業界
の発展に寄与するところ極めて大なるものがある。As is clear from the above description, the present invention involves inserting a rod member of a predetermined thickness from one side into the cavity C of a core box filled with green sand, and pressing the green sand from the other side with a suppressing member. Since the green sand is compressed and hardened, the molded core has good shape retention and is convenient to handle.Moreover, since it is hollow, it has very good disintegration after pouring. It has good degassing properties, and the advantage of being able to provide cores at a low price since no labor is required for the @-moulding.Coupled with this, this method has become popular in the industry as a core manufacturing method that solves the problems of the conventional green sand core manufacturing method. There are some extremely important contributions that can be made to the development of the world.

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

第１図〜第３図は本発明の種々な実施例を示す縦断面図
である。 （１）：空洞　　　　　　（２）：中子箱（３）：補助
空洞　　　　（４）：補助部材（５）二俸部材　　　　
　（２１）二空洞（２２）　：中子箱　　　　　（２３
）　：補助空洞（２４）　：補助部材　　　　（２５）
　；　（２６）　：棒部材（２７）　：押圧部材　　　
　（３１ｂ）　（３１ｃ）　：補助空洞（３３）　：棒
部材　　　　　（３４）　；　（３５）　：押圧部材（
４１）〜（４３Ｅ：補助空洞　−（４４）〜（４６）　
：補助部材（４７）　：押圧部材 芽１囚　　　　　　　　　　　　條２凶芳３図1 to 3 are longitudinal sectional views showing various embodiments of the present invention. (1): Cavity (2): Core box (3): Auxiliary cavity (4): Auxiliary member (5) Two-barrel member
(21) Two cavities (22): Core box (23
) : Auxiliary cavity (24) : Auxiliary member (25)
(26) : Bar member (27) : Pressing member
(31b) (31c): Auxiliary cavity (33): Rod member (34); (35): Pressing member (
41) ~ (43E: Auxiliary cavity - (44) ~ (46)
: Auxiliary member (47) : Pressing member bud 1 prisoner 2 conditions 3 figures

Claims (2)

【特許請求の範囲】[Claims] １．２箇所以上の端面開口部を有する中子箱の空洞に生
砂を充填したのち、前記端面開口部のうちの少なくとも
１箇所を除く開口部から先端部が略逆錐体状を成す棒部
材を前記生砂内に挿入して該生砂を１０〜５０％圧縮す
るとともに、前記残りの開口部に抑圧部材を介し生砂を
押し込んで、空洞内の生砂全体を圧縮硬化させ、その後
前記棒部材および押圧部材を硬化した生砂から分離させ
ることを特徴とする中子造型方法。1. After filling green sand into the cavity of a core box having two or more end face openings, a rod whose tip end forms a substantially inverted cone shape from the opening excluding at least one of the end face openings. A member is inserted into the green sand to compress the green sand by 10 to 50%, and the green sand is pushed into the remaining opening through the suppressing member to compress and harden the entire green sand in the cavity, and then A core molding method characterized by separating the rod member and the pressing member from hardened green sand. ２．２箇所以上の端面開口部を有する中子箱の空洞に生
砂冬充填したのち、前記端面開口部のうちの少なくとも
１箇所を除く開口部から先端部が略逆錐体状を成す棒部
材を前記生砂内に挿入して該生砂を１０〜５０％圧縮す
るとともに前記開口、全部に押圧部材を介し生砂を押し
込んで空洞内の生砂全体を圧縮硬化させ、その後、前記
棒部材および押圧部材を硬化した生砂から分離させるこ
とを特徴とする中子造型方法。2. After filling the cavity of a core box having two or more end face openings with green sand, the rod has a tip that forms a substantially inverted cone shape from the opening excluding at least one of the end face openings. A member is inserted into the green sand to compress the green sand by 10 to 50%, and the green sand is pushed into the entire opening through the pressing member to compress and harden the entire green sand in the cavity, and then the rod A core molding method characterized by separating a member and a pressing member from hardened green sand.
JP21742482A 1982-12-10 1982-12-10 Core molding method Pending JPS59107748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21742482A JPS59107748A (en) 1982-12-10 1982-12-10 Core molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21742482A JPS59107748A (en) 1982-12-10 1982-12-10 Core molding method

Publications (1)

Publication Number Publication Date
JPS59107748A true JPS59107748A (en) 1984-06-22

Family

ID=16703989

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21742482A Pending JPS59107748A (en) 1982-12-10 1982-12-10 Core molding method

Country Status (1)

Country Link
JP (1) JPS59107748A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012140508A1 (en) * 2011-04-13 2012-10-18 Toyota Jidosha Kabushiki Kaisha Casting core and production method of the casting core

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195555A (en) * 1981-05-29 1982-12-01 Sintokogio Ltd Molding method for core

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57195555A (en) * 1981-05-29 1982-12-01 Sintokogio Ltd Molding method for core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012140508A1 (en) * 2011-04-13 2012-10-18 Toyota Jidosha Kabushiki Kaisha Casting core and production method of the casting core

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