JPH0787966B2 - Composite mold - Google Patents
Composite moldInfo
- Publication number
- JPH0787966B2 JPH0787966B2 JP4105687A JP4105687A JPH0787966B2 JP H0787966 B2 JPH0787966 B2 JP H0787966B2 JP 4105687 A JP4105687 A JP 4105687A JP 4105687 A JP4105687 A JP 4105687A JP H0787966 B2 JPH0787966 B2 JP H0787966B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- reinforcing
- sand mold
- sand
- cooling gas
- 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
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- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】 A.発明の目的 （１） 産業上の利用分野 本発明は複合鋳型、特に、鋳造体成形用キャビテイを有
する砂型と、該砂型を補強すべく、該砂型を囲繞する金
属製補強型とを有するものの改良に関する。DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the Invention (1) Field of Industrial Application The present invention relates to a composite mold, in particular, a sand mold having a cavity for molding a cast body, and surrounding the sand mold to reinforce the sand mold. The present invention relates to an improvement of a metal reinforcing die.
（２） 従来の技術 従来、この種複合鋳型は、砂型の外面が補強型の内面に
密着するように構成されている（実公昭55−28368号公
報参照）。(2) Conventional Technology Conventionally, this type of composite mold is configured such that the outer surface of the sand mold is in close contact with the inner surface of the reinforcing mold (see Japanese Utility Model Publication No. 55-28368).
（３） 発明が解決しようとする問題点 しかしながら前記のように構成すると、砂型が溶湯によ
り加熱されてガスを発生した際に、砂型外面側へのガス
抜き通路がないため、そのガスが溶湯に巻込まれて鋳造
体に巣等の鋳造欠陥が発生するおそれがある。(3) Problems to be Solved by the Invention However, with the above-mentioned structure, when the sand mold is heated by the molten metal to generate gas, there is no gas vent passage to the outer surface of the sand mold, so that the gas becomes molten metal. There is a risk of being caught and causing casting defects such as cavities in the cast body.
また砂型の保温性に伴い鋳造体の冷却速度が遅くなっ
て、その生産能率が悪いといった問題もある。Further, there is a problem that the cooling rate of the cast body becomes slow due to the heat retaining property of the sand mold, resulting in poor production efficiency.
本発明は前記に鑑み、砂型より発生するガスを効率良く
除去し、また鋳造体の冷却速度を速めることのできる前
記複合鋳型を提供することを目的とする。In view of the above, it is an object of the present invention to provide the composite mold that can efficiently remove the gas generated from the sand mold and increase the cooling rate of the cast body.
B.発明の構成 （１） 問題点を解決するための手段 本発明は、一端を該補強型の外面に、また他端を前記砂
型に臨む該補強型の内面にそれぞれ開口させた複数の通
孔を前記補強型に設け、該補強型の外周に、各通孔が連
通する冷却ガス流通室を備えたことを特徴とする。B. Structure of the Invention (1) Means for Solving the Problems In the present invention, one end is opened on the outer surface of the reinforcing mold and the other end is opened on the inner surface of the reinforcing mold facing the sand mold. A hole is provided in the reinforcing mold, and a cooling gas flow chamber communicating with each of the through holes is provided on the outer periphery of the reinforcing mold.
（２） 作用 前記のように構成すると、砂型が溶湯により加熱されて
ガスを発生した際に、そのガスは各通孔を経て冷却ガス
流通室に効率良く除去される。(2) Operation With the above configuration, when the sand mold is heated by the molten metal to generate a gas, the gas is efficiently removed to the cooling gas flow chamber through each through hole.
また砂型は、冷却ガスおよび金属性補強型により冷却さ
れるので、鋳造体の冷却速度が速められる。Further, since the sand mold is cooled by the cooling gas and the metallic reinforcing mold, the cooling speed of the cast body is increased.
（３） 実施例 第１図は、第2,第３図に示す本発明複合鋳型１を用いて
鋳造された鋳造体としての内燃機関用カム軸２を示し、
そのカム軸２は従来周知のものであって、相隣るものを
一組とする複数組のカム部３、相隣るカム部３間および
両端部にそれぞれ存するジャーナル部４等を有する。(3) Example FIG. 1 shows a camshaft 2 for an internal combustion engine as a cast body cast by using the composite mold 1 of the present invention shown in FIGS.
The cam shaft 2 is well known in the related art, and has a plurality of sets of cam portions 3 including adjacent ones, journal portions 4 existing between the adjacent cam portions 3 and at both ends thereof, and the like.
第2,第３図において、複合鋳型１は、軸線を上下方向に
向けたカム軸成形用キャビテイ５を有する砂型６と、そ
の砂型６を補強すべく、砂型６を囲繞してそれと結合さ
れた金属製補強型７と、補強型７外面との間に空間を画
成して、その補強型７を囲繞すると共にそれと結合され
た箱体８とよりなる。In FIGS. 2 and 3, the composite mold 1 has a sand mold 6 having a camshaft forming cavity 5 with its axis oriented in the vertical direction, and a sand mold 6 surrounding the sand mold 6 in order to reinforce the sand mold 6 and combined with it. A space is defined between the metal reinforcing die 7 and the outer surface of the reinforcing die 7, and the box 8 surrounds the reinforcing die 7 and is connected to it.
砂型６は、バインダとしてフェノール樹脂を含有するシ
エル砂より構成され、そのキャビテイ５の上端に連通す
る湯口９を備えている。The sand mold 6 is made of shell sand containing a phenol resin as a binder, and has a sprue 9 communicating with the upper end of the cavity 5.
砂型６と補強型７とは、凹凸嵌合部10を介して部分的に
結合されており、補強型７には、砂型６の外面に臨む複
数の空洞部11と、相隣る空洞部11間を連通する複数の連
通孔12と、一端を補強型７の外面に、また他端を各空洞
部11の内面にそれぞれ開口させた複数の通孔13が設けら
れる。砂型６の各カムノーズ成形部14に開口15が形成さ
れ、各開口15に補強型７の各冷し金部16が嵌合してそれ
らがキャビテイ５の一部を構成している。The sand mold 6 and the reinforcing mold 7 are partially coupled to each other via the concave-convex fitting portion 10. The reinforcing mold 7 has a plurality of hollow portions 11 facing the outer surface of the sand mold 6 and adjacent hollow portions 11 thereof. A plurality of communication holes 12 communicating with each other and a plurality of communication holes 13 having one end opened on the outer surface of the reinforcing mold 7 and the other end opened on the inner surface of each cavity 11 are provided. An opening 15 is formed in each cam nose forming portion 14 of the sand mold 6, and each cooling metal portion 16 of the reinforcing mold 7 is fitted into each opening 15 and they form a part of the cavity 5.
補強型７外周の空間は冷却ガス流通室17として機能し、
そこで箱体８の底壁に複数の冷却ガス導入管18が、また
天井壁に複数の冷却ガス排出管19がそれぞれ取付けら
れ、各冷却ガス導入管18はブロア20に接続される。The space around the reinforced mold 7 functions as a cooling gas distribution chamber 17,
Therefore, a plurality of cooling gas introduction pipes 18 are attached to the bottom wall of the box body 8, and a plurality of cooling gas discharge pipes 19 are attached to the ceiling wall, and each cooling gas introduction pipe 18 is connected to the blower 20.
複合鋳型１は、キャビテイ５の軸線を含む垂直面で二分
割でされており、したがって、砂型６、補強型７および
箱体８は、各一対の半体61,62、71,72および81,82より
構成される。補強型７の一方の半体72に、砂型６外面に
臨む複数の凹部21がキャビティ５軸線方向に所定の間隔
をとって形成される。各凹部21に砂型保護用当接体22が
摺合され、その当接体22と凹部21底面との間に押圧ばね
23が縮設される。これにより各押圧ばね23の弾発力で砂
型６の一方の半体62が他方の半体61に押圧される。The composite mold 1 is divided into two parts on a vertical plane including the axis of the cavity 5, and therefore, the sand mold 6, the reinforcing mold 7 and the box body 8 are each composed of a pair of halves 6 1 , 6 2 , 7 1 , 7 1 . It consists of 2 and 8 1 , 8 2 . The half 7 2 of one of the reinforced 7, a plurality of recesses 21 facing the sand mold 6 outer surface is formed by taking a predetermined interval in the cavity 5 axis direction. A sand type protection contact body 22 is slid into each recess 21, and a pressing spring is provided between the contact body 22 and the bottom of the recess 21.
23 will be reduced. Thus one half 6 2 sand mold 6 by the elastic force of the pressure spring 23 is pressed against the other half 6 1.
次に、カム軸２の鋳造作業について説明する。Next, the casting work of the camshaft 2 will be described.
先ず、50〜70重量％の鋼のスクラップ材および30〜50重
量％の返り材を主原料として、これらを高周波溶解炉等
で溶解し、その溶湯に、炭素および鉄−クロム、鉄−モ
リブテン、鉄−バナジウム等の合金を添加し、下表に示
すようにJIS SKD11相当の溶湯を調整する。First, 50 to 70% by weight of steel scrap material and 30 to 50% by weight of return material are used as main raw materials, and these are melted in a high frequency melting furnace or the like, and in the molten metal, carbon and iron-chromium, iron-molybdenum, Add an alloy such as iron-vanadium and prepare a molten metal equivalent to JIS SKD11 as shown in the table below.
次いで、前記溶湯をアルゴンガス等の不活性ガス雰囲気
下で1600〜1650℃に昇温した後、溶湯にアルミニウムま
たはカルシウム−ケイ素合金といった脱酸剤を添加す
る。 Next, after raising the temperature of the molten metal to 1600 to 1650 ° C. in an atmosphere of an inert gas such as argon gas, a deoxidizer such as aluminum or calcium-silicon alloy is added to the molten metal.
ブロア20を作動して冷却ガス流通室17に冷却ガスとして
空気を流通し、前記溶湯を温度1550〜1600℃にて砂型６
に注入する。The blower 20 is operated to flow air as a cooling gas into the cooling gas flow chamber 17, and the molten metal is poured into the sand mold 6 at a temperature of 1550 to 1600 ° C.
Inject.
溶湯の注入により砂型６が加熱されて、そのバインダの
燃焼に伴いガスが発生すると、そのガスは各空洞部11、
各連通孔12および各通孔13を経て冷却ガス流通室17に効
率良く除去され、次いで空気と共に外部へ排出される。When the sand mold 6 is heated by the injection of the molten metal and gas is generated by the combustion of the binder, the gas is generated in each cavity 11,
It is efficiently removed to the cooling gas flow chamber 17 through each communication hole 12 and each communication hole 13 and then discharged to the outside together with air.
また砂型６は、空気および金属製補強型７により冷却さ
れるので、カム軸２の冷却速度が速められ、その結果溶
湯の注入終了後２分間でカム軸２の離型が可能である。Further, since the sand mold 6 is cooled by the air and the metal reinforcing mold 7, the cooling speed of the cam shaft 2 is increased, and as a result, the cam shaft 2 can be released from the mold 2 minutes after the completion of pouring the molten metal.
前記鋳造工程を経て得られたカム軸２には、ガスの巻込
みに起因した巣等の鋳造欠陥の発生がなく、その品質は
優秀である。The camshaft 2 obtained through the casting process has no casting defects such as cavities due to gas entrainment, and its quality is excellent.
また各カム部３のカムノーズ3aは各冷し金部16に急冷さ
れて微細な金属組織となており、各カムノーズ3aの耐摩
耗性の向上が図られている。各冷し金部16を補強型７の
一部によって構成すると、特別に冷し金を用意する必要
がなく、経済的である。Further, the cam nose 3a of each cam portion 3 is rapidly cooled by each cooling metal portion 16 to form a fine metal structure, and the wear resistance of each cam nose 3a is improved. If each chill part 16 is formed by a part of the reinforcing die 7, it is economical because it is not necessary to prepare a special chill.
また、前記のように冷却ガスとして空気を用いると、そ
の空気が各通孔13および各連通孔12を経て各空洞部11に
進入するので、砂型６に含まれるバインダの燃焼が空気
により助勢され、その結果バインダが略完全に燃焼する
ので、鋳造後における砂型６の崩壊性が良好となる。Further, when air is used as the cooling gas as described above, the air enters each cavity 11 through each through hole 13 and each through hole 12, so that the combustion of the binder contained in the sand mold 6 is assisted by the air. As a result, since the binder burns almost completely, the disintegration property of the sand mold 6 after casting becomes good.
従来装置の場合は、砂型外面が補強型内面に密着してい
るので、砂型が空気より遮断され、その結果バインダが
不完全燃焼となって砂型の崩壊性が悪いといった問題が
ある。In the case of the conventional device, since the outer surface of the sand mold is in close contact with the inner surface of the reinforcing mold, the sand mold is shielded from the air, and as a result, the binder is incompletely burned and the collapsibility of the sand mold is poor.
なお、本発明カム軸に限らず、その他の鋳造体、例えば
クランク軸、ナックルアーム、ブレーキキャリパ等の鋳
造に適用される。It should be noted that the present invention is not limited to the camshaft and is applicable to other castings such as crankshafts, knuckle arms, and brake calipers.
C.発明の効果 本発明によれば、砂型が溶湯により加熱されて発生した
ガスを各通孔を経て冷却ガス流通室に効率良く除去する
ことができ、したがって、鋳造体における前記ガスに起
因した鋳造欠陥の発生を回避することができる。C. Effect of the Invention According to the present invention, the gas generated when the sand mold is heated by the molten metal can be efficiently removed to the cooling gas flow chamber through each through hole, and therefore is caused by the gas in the cast body. It is possible to avoid the occurrence of casting defects.
また砂型を、冷却ガスおよび金属製補強型により冷却し
得るので、鋳造体の冷却速度を速めて、その生産能率を
向上させることができる。Further, since the sand mold can be cooled by the cooling gas and the metal reinforcing mold, the cooling rate of the cast body can be increased and the production efficiency thereof can be improved.
第１図はカム軸の正面図、第２および第３図は本発明の
一実施例を示し、第２図は全体の斜視図、第３図は第２
図III−III線断面図である。 １……鋳造体としてのカム軸、５……キャビテイ、６…
…砂型、７……補強型、13……通孔、16……冷し金部、
17……冷却ガス流通室FIG. 1 is a front view of a camshaft, FIGS. 2 and 3 show an embodiment of the present invention, FIG. 2 is an overall perspective view, and FIG.
It is a sectional view taken along the line III-III. 1 ... Camshaft as cast body, 5 ... cavity, 6 ...
… Sand type, 7… Reinforcement type, 13… Through hole, 16… Chilled part,
17 …… Cooling gas distribution room
───────────────────────────────────────────────────── フロントページの続き (72)発明者 永岡 忠生 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 (72)発明者 井上 正博 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内 (56)参考文献 特開 昭61−78548（ＪＰ，Ａ) 実開 昭62−34949（ＪＰ，Ｕ) 実開 昭63−2538（ＪＰ，Ｕ) 実開 昭53−153009（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadao Nagaoka 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (72) Masahiro Inoue 1-10-1 Shin-Sayama, Sayama-shi, Saitama Within Da Engineering Co., Ltd. (56) Reference Japanese Unexamined Patent Publication No. 61-78548 (JP, A) Actually opened 62-34949 (JP, U) Actually opened 63-2538 (JP, U) Actually opened 53-153009 ( JP, U)
Claims (3)
該砂型を補強すべく、該砂型を囲繞する金属製補強型と
を有する複合鋳型において、一端を該補強型の外面に、
また他端を前記砂型に臨む該補強型の内面にそれぞれ開
口させた複数の通孔を前記補強型に設け、該補強型の外
周に、各通孔が連通する冷却ガス流通室を備えたこと特
徴とする複合鋳型。1. A sand mold having a cavity for molding a cast body,
In order to reinforce the sand mold, in a composite mold having a metal reinforcing mold surrounding the sand mold, one end on the outer surface of the reinforcing mold,
Further, a plurality of through holes, each of which is opened on the inner surface of the reinforcing mold facing the sand mold at the other end, are provided in the reinforcing mold, and the outer periphery of the reinforcing mold is provided with a cooling gas flow chamber in which the through holes communicate with each other. Characteristic composite mold.
含み、前記冷却ガス流通室に冷却ガスとして空気を流通
させるようにした、特許請求の範囲第（１）項記載の複
合鋳型。2. The composite mold according to claim 1, wherein the sand mold includes a binder that burns with the heat of the molten metal, and air is circulated as a cooling gas in the cooling gas flow chamber.
ャビテイの一部を構成する冷し金部を備えている、特許
請求の範囲第（１）または第（２）項記載の複合鋳型。3. The composite according to claim 1, wherein the reinforcing mold has a chill part that penetrates the sand mold and forms a part of the cavity. template.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4105687A JPH0787966B2 (en) | 1987-02-24 | 1987-02-24 | Composite mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4105687A JPH0787966B2 (en) | 1987-02-24 | 1987-02-24 | Composite mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63207445A JPS63207445A (en) | 1988-08-26 |
| JPH0787966B2 true JPH0787966B2 (en) | 1995-09-27 |
Family
ID=12597753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4105687A Expired - Lifetime JPH0787966B2 (en) | 1987-02-24 | 1987-02-24 | Composite mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0787966B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2511567B2 (en) * | 1990-09-21 | 1996-06-26 | 株式会社日立製作所 | Water turbine runner manufacturing method and mold for parts |
| JP2736491B2 (en) * | 1992-11-25 | 1998-04-02 | リョービ株式会社 | Method and apparatus for discharging gas in mold |
| DE10221074B4 (en) * | 2002-05-10 | 2004-08-05 | Dihag Deutsche Giesserei- Und Industrie-Holding Ag | Casting mold for the production of a casting using the basic molding material and using such a casting mold |
-
1987
- 1987-02-24 JP JP4105687A patent/JPH0787966B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63207445A (en) | 1988-08-26 |
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