JP2558518B2 - Raw sand molding method - Google Patents
Raw sand molding methodInfo
- Publication number
- JP2558518B2 JP2558518B2 JP1032925A JP3292589A JP2558518B2 JP 2558518 B2 JP2558518 B2 JP 2558518B2 JP 1032925 A JP1032925 A JP 1032925A JP 3292589 A JP3292589 A JP 3292589A JP 2558518 B2 JP2558518 B2 JP 2558518B2
- Authority
- JP
- Japan
- Prior art keywords
- model
- mold
- molding method
- preliminary
- raw 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
- Casting Devices For Molds (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、生砂型の造型方法の改良に関する。TECHNICAL FIELD The present invention relates to an improvement in a method for molding a green sand mold.
（従来技術と課題） 従来、定盤上の鋳枠に充填した生砂を上金型で圧縮し
て生型を造型するようにした鋳型造型法では、生砂型の
見切面における平な面と凹みの境目すなわちエッジ部が
崩壊しやすい問題があった。(Prior art and problems) Conventionally, in a mold molding method in which raw sand filled in a molding frame on a surface plate is compressed by an upper die to form a green mold, a flat surface on a parting surface of the raw sand mold There was a problem that the boundary of the dent, that is, the edge portion was likely to collapse.
本発明は上記の問題を解消するためになされたもので
ある。The present invention has been made to solve the above problems.
（課題を解決するための手段） 上記目的を達成するために本発明の生砂型造型法は、
少なくとも横方向の寸法が正規の寸法より短かい模型部
を有する予備上型模型を用いて画成したキャビティに生
砂を吹き込むと共に該予備上型模型を分離して予備成形
体を成形した後、正規の寸法の模型部を有する上型模型
で前記予備成形体を下方に圧縮するようにしたものであ
る。(Means for Solving the Problems) In order to achieve the above object, the green sand molding method of the present invention comprises:
At least the lateral dimension is blown with fresh sand into the cavity defined by using the preliminary upper model having a shorter model than the regular dimension, and the preliminary upper model is separated to form a preform, The preform is compressed downward by an upper mold having a model part of regular size.
（実施例） 実施例について図面を参照して説明すると、第１図に
おいて（１）は、生砂型造型用凹部（２）を有する下型
模型で、該下型模型（１）の底部には離型ピン（３）
（３）が上昇可能に懸装され、該離型ピン（３）の下端
は、図示しない懸装杆を介して下型模型（１）に上昇可
能に懸装した押出し板（４）上に固着されている。ま
た、第２図において（５）は予備上型模型で、上下に貫
通する吹込口（６）を備えたフランジ付の模型部取付板
（７）と、該模型部取付板（７）の下面に固着された模
型部（８）とで構成されている。そして、該模型部
（８）は横寸法（Ａ′）および縦寸法が後述する正規の
上型模型（９）の横寸法（Ａ）および縦寸法より若干小
さく構成されている。第３図において（９）は正規の上
型模型で、フランジ付の模型部取付板（10）と、該模型
部取付板（10）の下面に固着された模型部（11）とで構
成されている。なお、（12）はガイドピン、（13）はガ
イドピン穴、（14）はブッシュである。(Embodiment) An embodiment will be described with reference to the drawings. In FIG. 1, (1) is a lower mold model having a concave portion (2) for green sand molding, and a bottom part of the lower mold model (1) is shown. Release pin (3)
(3) is liftably suspended, and the lower end of the mold release pin (3) is placed on an extruding plate (4) that is vertically liftably suspended on the lower model (1) via a suspension rod (not shown). It is fixed. Further, in FIG. 2, (5) is a preliminary upper model, which is a model part mounting plate (7) with a flange having a blow-in port (6) penetrating vertically and a lower surface of the model part mounting plate (7). And a model portion (8) fixed to the. The model portion (8) has a lateral dimension (A ') and a longitudinal dimension slightly smaller than the lateral dimension (A) and the longitudinal dimension of a regular upper model (9) described later. In FIG. 3, (9) is a regular upper model, which is composed of a model part mounting plate (10) with a flange and a model part (11) fixed to the lower surface of the model part mounting plate (10). ing. In addition, (12) is a guide pin, (13) is a guide pin hole, and (14) is a bush.
次にこのように構成された装置を用いて無枠状の生砂
型を造型する手順について説明すると、予備上型模型
（５）を下降させて予備上型模型（５）と下型模型
（１）の凹部（２）とでキャビティを画成し、続いて、
吹込口（６）からキャビティ内に生砂を吹き込み、生砂
の吹き込み完了後、予備上型模型（５）を下型模型
（１）から分離上昇させて第１図に二点鎖線で示すよう
に予備成形体を成形する。次いで、上型模型（９）を下
型模型（１）の凹部（２）に挿入して予備成形体を縦方
向に圧縮すると同時に、模型部（８）と模型部（11）の
横方向の寸法差によって当該予備成形体を横方向にも圧
縮する。このように予備成形体を横方向に圧縮すること
により、いわゆるエッヂ部を強固にすることができる。
予備成形体の圧縮完了後、押出し板（４）を介して離型
ピン（３）（３）を上昇させて、圧縮固化された生砂を
凹部（２）から分離上昇させると、所望の生砂型を得る
ことができる。Next, the procedure for molding a frameless green sand mold using the apparatus configured as described above will be described. The preliminary upper mold model (5) is lowered to make the preliminary upper mold model (5) and the lower mold model (1). ), The cavity is defined by the recess (2), and subsequently,
Blown sand is blown into the cavity from the blowing port (6), and after the blowing of the fresh sand is completed, the preliminary upper mold model (5) is lifted up from the lower mold model (1) as shown by the two-dot chain line in FIG. The preform is molded into. Next, the upper mold model (9) is inserted into the recess (2) of the lower mold model (1) to compress the preform in the vertical direction, and at the same time, the model part (8) and the model part (11) are moved in the lateral direction. Due to the dimensional difference, the preform is also compressed in the lateral direction. By laterally compressing the preform in this manner, the so-called edge portion can be strengthened.
After the completion of compression of the preform, the release pins (3) and (3) are raised via the extrusion plate (4) to separate and raise the compression-solidified raw sand from the recesses (2). A sand mold can be obtained.
（発明の効果） 以上の説明からも明らかなように本発明によれば、い
わゆる生砂型のエッヂ部を横方向へも積極的にして大き
く圧縮するため、従来の生砂型造型法と比較してエッヂ
部の密度が大巾に高くなり、強度が向上して、エッヂ部
の崩壊が生じなくなどの効果を奏する。(Effects of the Invention) As is apparent from the above description, according to the present invention, the edge portion of a so-called green sand mold is positively and significantly compressed in the lateral direction, so that it is compared with the conventional green sand molding method. The density of the edge portion is significantly increased, the strength is improved, and the edge portion is not collapsed.
図面は本発明に使用した下型模型および上型模型を示
し、第１図は下型模型の縦断面図、第２図は予備上型模
型の正面図、第３図は上型模型の正面図である。 （１）：下型模型、（２）：凹部 （５）：予備上型模型、（９）：上型模型The drawings show the lower mold model and the upper mold model used in the present invention. Fig. 1 is a vertical sectional view of the lower mold model, Fig. 2 is a front view of a preliminary upper mold model, and Fig. 3 is a front view of the upper mold model. It is a figure. (1): Lower model, (2): Recessed part (5): Preliminary upper model, (9): Upper model
Claims (1)
（Ａ′）が正規の横寸法（Ａ）より小さい模型部を有す
る予備上型模型とで画成したキャビティに生砂を吹き込
むと共に該予備上型模型を分離して予備成形体を成形し
た後、正規の寸法の模型部を有する上型模型で前記予備
成形体を下方に圧縮することを特徴とする生砂型造型
法。1. Raw sand is blown into a cavity defined by a concave portion of a lower mold and a preliminary upper mold having at least a lateral dimension (A ') smaller than a regular lateral dimension (A), and the raw sand is blown into the cavity. A green sand molding method, characterized in that after the preliminary upper mold model is separated to mold a preliminary molded body, the preliminary molded body is compressed downward by an upper mold model having a model portion of a regular size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1032925A JP2558518B2 (en) | 1989-02-13 | 1989-02-13 | Raw sand molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1032925A JP2558518B2 (en) | 1989-02-13 | 1989-02-13 | Raw sand molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02211932A JPH02211932A (en) | 1990-08-23 |
| JP2558518B2 true JP2558518B2 (en) | 1996-11-27 |
Family
ID=12372486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1032925A Expired - Fee Related JP2558518B2 (en) | 1989-02-13 | 1989-02-13 | Raw sand molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2558518B2 (en) |
-
1989
- 1989-02-13 JP JP1032925A patent/JP2558518B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02211932A (en) | 1990-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080905 Year of fee payment: 12 |
|
| LAPS | Cancellation because of no payment of annual fees |