JPH0635047B2 - How to remove the core - Google Patents

How to remove the core

Info

Publication number
JPH0635047B2
JPH0635047B2 JP28034987A JP28034987A JPH0635047B2 JP H0635047 B2 JPH0635047 B2 JP H0635047B2 JP 28034987 A JP28034987 A JP 28034987A JP 28034987 A JP28034987 A JP 28034987A JP H0635047 B2 JPH0635047 B2 JP H0635047B2
Authority
JP
Japan
Prior art keywords
core
gas
casting
sand
combustion 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
Application number
JP28034987A
Other languages
Japanese (ja)
Other versions
JPH01122658A (en
Inventor
雅文 西田
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP28034987A priority Critical patent/JPH0635047B2/en
Publication of JPH01122658A publication Critical patent/JPH01122658A/en
Publication of JPH0635047B2 publication Critical patent/JPH0635047B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/003—Removing cores using heat

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)

Description

【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は鋳物製品の製法に係るもので、より詳しくは粗
製品である鋳物中に残存する中子を除去する方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of use> The present invention relates to a method for producing a casting product, and more particularly to a method for removing a core remaining in a casting which is a crude product.

＜従来の技術＞ 通常、中空状の鋳物製品を製造する時は中子が用いられ
ている。中子を用いる鋳造において、鋳型と中子によっ
て形成される空間（キャビティ）に溶湯を注入、凝固せ
しめることによって鋳物は得られるが、型ばらしして取
り出された鋳物の内部には中子が残留しており、最終的
な鋳物製品とするには鋳物内部の中子を除去しなければ
ならない。<Prior Art> Usually, a core is used when a hollow casting product is manufactured. In casting using a core, a casting can be obtained by injecting molten metal into the space (cavity) formed by the mold and the core to solidify it, but the core remains inside the casting taken out from the mold. Therefore, the core inside the casting must be removed to obtain the final casting product.

ところで、中子は通常中子砂と粘結剤とからなり、粘結
剤によって中子砂が結合されて所定の形状に作られてい
る。そして、使用される粘結剤は有機粘結剤と無機粘結
剤に大別されるが、特に有機粘結剤は可燃性であって熱
分解し易いことから、中子を崩壊せしめ分離状態の中子
砂を再び得るのに都合良く、中子砂を種々の形状の中子
として利用したい場合には、多用されている。By the way, the core is usually composed of core sand and a binder, and the core sand is bonded by the binder to form a predetermined shape. The binders used are roughly classified into organic binders and inorganic binders. In particular, since organic binders are flammable and easily decomposed by heat, the core is disintegrated and separated. It is often used when it is convenient to obtain core sand again and it is desired to use the core sand as cores of various shapes.

この有機粘結剤を使用してなる中子を用いて鋳造された
鋳物から中子を除去する方法として従来は、鋳物に衝撃
を与え中子を崩壊、除去する方法（衝撃付与法）とか、
約400〜500℃の砂焼き炉内に鋳物を入れ中子を加熱崩壊
せしめる方法（砂焼き法）が一般的に採用されてきた。Conventionally, as a method of removing the core from a casting that has been cast using a core made of this organic binder, a method of collapsing and removing the core by impacting the casting (impact applying method),
A method of putting a casting into a sand-baking furnace at about 400 to 500 ° C to heat and collapse the core (sand-baking method) has been generally adopted.

しかし、衝撃付与法は、鋳物形状に恵まれ、鋳造時の高
温がよく伝わって中子が半ば熱分解している場合には有
利に適用できるものの多くの場合、衝撃によって鋳物が
割れたり、傷つく等、鋳物を不良にする。However, the impact application method is advantageous when the shape of the casting is good, and the high temperature during casting is well transmitted and the core is partially pyrolyzed, but in many cases, the casting is cracked or damaged by impact , Make the casting defective.

また砂焼き法は、粘結剤を焼くために約２〜３時間にわ
たって炉内に鋳物を滞留させなければならず、多額の燃
料費を要すると共に長時間にわたる作業時間を費やさな
ければならない。Further, in the sand baking method, the casting must be retained in the furnace for about 2 to 3 hours to bake the binder, which requires a large amount of fuel cost and a long working time.

そのため従来の衝撃付与法や砂焼き法に代えて、鋳型に
内設したガス流通孔を通じて中子の幅木部間に高温酸素
ガスを流通させる方法（特公平02-9531号）、予め中子
形成時にその幅木部に埋設しておいたガス供給管から燃
焼用ガスを供給する方法（特開昭63-224862号）、及び
中子の大気開放端部を有機粘結剤の燃焼温度以上に加熱
してそこから酸素含有ガスを供給する方法（特開平01-1
8564号）が提案されている。Therefore, instead of the conventional impacting method or sand-baking method, a method of circulating hot oxygen gas between the skirting parts of the core through gas circulation holes provided in the mold (Japanese Patent Publication No. 02-9531) A method for supplying combustion gas from a gas supply pipe embedded in the skirting board at the time of formation (JP-A-63-224862), and the atmosphere open end of the core is at or above the combustion temperature of the organic binder. A method of heating to a high temperature and supplying an oxygen-containing gas from there
No. 8564) has been proposed.

＜発明が解決しようとする問題点＞ しかしながら、これらの提案方法（ガス供給法）には以
下のような問題点があった。<Problems to be Solved by the Invention> However, these proposed methods (gas supply methods) have the following problems.

すなわち第３図に示すように鋳物１に鋳ぐるまれている
中子２を燃焼用ガス１０で除去する際に、ガス供給口が
一カ所であるのに対してガス排出口が２カ所以上ある場
合には、ガス流１３は低密度部１４に流れるため、片側
の排出口からのみ中子２が排出され、高密度側１５には
中子残りが生じるという問題があった。That is, as shown in FIG. 3, when removing the core 2 that is encased in the casting 1 with the combustion gas 10, there are one gas supply port and two or more gas discharge ports. In this case, since the gas flow 13 flows to the low density portion 14, there is a problem that the core 2 is discharged only from the discharge port on one side and the core remains on the high density side 15.

また中子の幅が大きい時には中子の中心部で温度が高い
ため、第４図に示すように燃焼用ガス１０が中心部のみ
を通過することにより、中子残り１６が生じるという問
題があった。Further, when the width of the core is large, the temperature is high in the central portion of the core, and as shown in FIG. 4, there is a problem that the core residue 16 occurs due to the combustion gas 10 passing only through the central portion. It was

本発明は上記問題を解決するために為されたものであ
り、その目的とするところは、燃焼用ガスを中子全体に
均一に流通せしめ、中子残りを生じさせることなく鋳物
から中子を完全に除去できる方法を提供することであ
る。The present invention has been made to solve the above problems, and its purpose is to allow the combustion gas to be evenly distributed throughout the core, and to form the core from the casting without causing core residue. It is to provide a method that can be completely removed.

＜問題点を解決するための手段＞ そのための本発明の中子の除去方法は、鋳物中に鋳ぐる
まれている有機粘結剤を用いた中子に、有機粘結剤燃焼
用ガスを供給せしめて中子を鋳物から除去する方法にお
いて、ガス排出口付近で通気抵抗をより大きくする手段
を用いることを特徴とする。<Means for Solving Problems> A core removing method of the present invention for that purpose is to supply an organic binder burning gas to a core using an organic binder that is cast in a casting. In the method of removing the core from the casting at least, it is characterized by using means for increasing the ventilation resistance near the gas discharge port.

上記の「ガス排出口付近で通気抵抗をより大きくする手
段」としては例えば、中子より大きな通気抵抗を有する
部材をガス排出口に押し付けることや或はガス排出口部
位の中子を局部的に高密度にしておくことが挙げられ
る。Examples of the above-mentioned “means for increasing ventilation resistance near the gas outlet” include pressing a member having a ventilation resistance higher than that of the core onto the gas outlet, or locally positioning the core of the gas outlet. It can be mentioned to keep the density high.

本発明方法は、鋳物内にあって大気開放部を複数有する
（鋳物から露出している所が二カ所以上ある）中子を除
去するのに適した方法であり、一方の大気開放部をガス
供給口としてそこから粘結剤燃焼用ガスを供給し、他方
の大気開放部をガス排出口としてガスならびに崩壊中子
を排出せしめるが、ガス供給口やガス排出口は一個所に
限定されるものではなく、位置、数を適当に選定して燃
焼用ガスが中子全体に均一に行き渡るようにするのがよ
い。INDUSTRIAL APPLICABILITY The method of the present invention is a method suitable for removing a core in a casting having a plurality of atmosphere opening portions (there are two or more locations exposed from the casting), and one of the atmosphere opening portions is gas. The binder combustion gas is supplied from there as a supply port, and the gas and the decay core are discharged from the other open air part as a gas discharge port, but the gas supply port and gas discharge port are limited to one location. Instead, it is preferable to properly select the position and the number so that the combustion gas is evenly distributed over the entire core.

燃焼用ガスとしては空気又は酸素混入ガスでよく、中子
が冷えている場合（約400℃以下）には高温ガスを用い
る必要があるが、鋳込み直後であれば常温空気でもよ
い。これは中子が注湯熱によりすでに熱分解温度まで加
熱されており、そこへ燃焼に必要な酸素を供給すること
により熱分解が促進され、しかも有機粘結剤の燃焼熱に
より高温化されるからである。The combustion gas may be air or an oxygen-containing gas, and when the core is cold (about 400 ° C. or less), it is necessary to use a high temperature gas, but room temperature air may be used immediately after casting. This is because the core has already been heated to the thermal decomposition temperature by the heat of pouring, and by supplying oxygen necessary for combustion to it, thermal decomposition is accelerated, and the temperature is raised by the combustion heat of the organic binder. Because.

＜作用＞ 鋳物内の中子に、その粘結剤の燃焼用ガスを供給する際
に、ガス排出口付近の通気抵抗をより大きくしておく
と、燃焼用ガスが最も通過し易い系路・部分のみを通っ
て中子外へ出るということがなくなる。つまりガス排出
口から容易にガスが流出できなくなることで中子内部に
滞留しだしたガスはより高圧となって、今までガスが及
ばなかった系路・部分にもガス流が発生する。<Operation> When the gas for combustion of the binder is supplied to the core in the casting, if the ventilation resistance near the gas discharge port is made larger, the system passage through which the combustion gas is most likely to pass There is no need to go out of the core through only the part. In other words, since the gas cannot easily flow out from the gas outlet, the gas that has accumulated inside the core has a higher pressure, and a gas flow is also generated in the system path / portion where the gas did not reach until now.

こうして中子全体に均一に行き渡るようになった燃焼用
ガスは、中子の全粘結剤を燃焼し、中子を完全崩壊に至
らしめる。The combustion gas, which has become evenly distributed over the entire core, burns all the binder in the core, and causes the core to completely collapse.

＜実施例＞ 以下、本発明を実施例により説明するが、これにより本
発明は何ら限定されるものではない。<Examples> Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited thereto.

実施例１ 第１図は本発明の中子の除去方法の一実施例の説明図で
あり、該図は中子２を鋳ぐるんだ鋳物１の下部を容器３
内に入れた後、該容器３内に充填材４を投入し、鋳物１
の上部にはガス供給治具８をあてた状態を断面で示して
いる。Example 1 FIG. 1 is an explanatory view of an example of a method for removing a core of the present invention, in which a lower part of a casting 1 in which a core 2 is surrounded is placed in a container 3
After being placed in the container, the filler 4 is put into the container 3 and the casting 1
The cross section shows the state in which the gas supply jig 8 is applied to the upper part of the.

鋳物１内に鋳ぐるまれている中子２は再生砂100部、フ
ェノール樹脂1.5部、ヘキサメチルテトラミン0.225部、
水1.5部、ステアリン酸カルシウム0.1部を混練して得ら
れた樹脂被覆砂から形成されたものである。一方、上記
容器３内に投入された充填材４は新砂100部、ベントナ
イト７部、水２部を混練した生砂であり、中子２の密度
より大きな密度とするために充分搗き固めてある。The core 2 which is surrounded by the casting 1 is 100 parts of reclaimed sand, 1.5 parts of phenol resin, 0.225 parts of hexamethyltetramine,
It is formed from resin-coated sand obtained by kneading 1.5 parts of water and 0.1 part of calcium stearate. On the other hand, the filler 4 charged in the container 3 is green sand obtained by kneading 100 parts of fresh sand, 7 parts of bentonite and 2 parts of water, and is sufficiently hardened to have a density higher than that of the core 2. .

ガス供給治具８は、燃焼用ガス１０の供給口６となる中
子の大気開放部を密閉するようにシール材７を介して鋳
物１に押し付けられており、シール材７はガス漏れによ
る供給ガス圧の低下を防ぐ。The gas supply jig 8 is pressed against the casting 1 via the seal material 7 so as to seal the atmosphere opening portion of the core which becomes the supply port 6 of the combustion gas 10, and the seal material 7 is supplied by gas leakage. Prevents a decrease in gas pressure.

以上のような状態において、ガス供給管９から燃焼用ガ
ス（空気）１０を５atm，700N／minで流入させると、
注湯後まもないために約400℃の高温に保持されている
中子２の熱と燃焼用ガス１０の酸素とにより中子２の粘
結剤（上記フェノール樹脂等）が燃焼する。排出口５，
５は中子よりも通気抵抗の大きい充填材４で塞がれてい
るため排出口５，５から容易に流出できなくなった燃焼
用ガス１０は中子全体に及び、該ガスと燃焼により発生
する熱とで全ての粘結剤が分解し、崩壊した中子はガス
流によって排出口５，５から完全に排除される。In the above state, when the combustion gas (air) 10 is made to flow from the gas supply pipe 9 at 5 atm and 700 N / min,
The heat of the core 2 and the oxygen of the combustion gas 10 which are maintained at a high temperature of about 400 ° C. shortly after pouring the metal burn the binder (such as the above-mentioned phenol resin) of the core 2. Outlet 5,
Since 5 is blocked by the filler 4 having a ventilation resistance higher than that of the core, the combustion gas 10 that cannot easily flow out from the exhaust ports 5 and 5 spreads to the entire core and is generated by the combustion with the gas. All the binder is decomposed by heat, and the collapsed core is completely removed from the outlets 5 and 5 by the gas flow.

実施例２ 第２図はこの実施例に係る中子２の除去方法を示す図
で、前記実施例１の充填剤４の代わりに通気抑制蓋11,1
1でガス排出口５，５が塞がれた格好になっている。該
抑制蓋11,11には中子よりも通気抵抗が大きくなるよう
にベント（小孔）12,12…が穿設されている。該蓋１１
は図示しない常用手段で、シール材7aを介して鋳物１に
押え付けられている。Embodiment 2 FIG. 2 is a diagram showing a method for removing the core 2 according to this embodiment, in place of the filler 4 of Embodiment 1 described above, the ventilation suppressing lids 11, 1
At 1, the gas outlets 5 and 5 are closed. Vents (small holes) 12, 12 ... Are bored in the suppression lids 11, 11 so that the ventilation resistance is larger than that of the core. The lid 11
Is a conventional means (not shown) and is pressed against the casting 1 through the seal material 7a.

以上のような状態で、燃焼用ガス１０を供給すれば、実
施例１の場合と同様の作用・効果をもって中子２が鋳物
１から完全に除去される。When the combustion gas 10 is supplied in the above-described state, the core 2 is completely removed from the casting 1 with the same action and effect as in the first embodiment.

実施例３ 本実施例では、前記実施例１，２で使用した充填剤４や
通気抑制蓋１１を全く用いずに中子を完全に除去する。
すなわち、中子の造型時に、中子２の排出口５，５（第
１図又は第２図参照）にあたる部分を局部的に高密度に
しておく。こうした中子２を用いて鋳込み後、供給口６
から燃焼用ガスを供給すると、他の部位よりも高密度と
なっている排出口５，５が前記充填剤４や抑制蓋１１と
同様の役目を果たし、燃焼用ガス流が中子全体に及ん
で、中子は崩壊・除去される。Example 3 In this example, the core is completely removed without using the filler 4 or the ventilation restraint lid 11 used in Examples 1 and 2.
That is, at the time of molding the core, the portions corresponding to the discharge ports 5 and 5 (see FIG. 1 or 2) of the core 2 are locally made high in density. After casting using such a core 2, the supply port 6
When the combustion gas is supplied from above, the discharge ports 5 and 5 which have a higher density than the other parts perform the same role as the filler 4 and the suppression lid 11, and the combustion gas flow spreads over the entire core. Then, the core is disintegrated and removed.

実施例４ 通気抑制蓋１１（第２図参照）のベント12,12…を可変
型とし、燃焼用ガス１０を供給後、中子２の一部のフェ
ノール樹脂が燃焼して部分的な崩壊が起こり、ベント1
2,12…からの排出が大きくなった時にベント12,12…を
小さくしてガス通気量を更に抑制する。このようにする
と中子２内のガス流を絶えず適当な状態に保ち、より迅
速に中子を除去することも可能となる。Example 4 The vents 12, 12 ... of the ventilation restraint lid 11 (see FIG. 2) are made variable, and after the combustion gas 10 is supplied, a part of the phenol resin of the core 2 is burned and partially collapsed. Happened and bent 1
When the discharge from 2,12 ... becomes large, the vents 12,12 ... are made smaller to further suppress the gas flow rate. In this way, the gas flow in the core 2 can be constantly maintained in an appropriate state, and the core can be removed more quickly.

＜発明の効果＞ 本発明の中子の除去方法によれば、中子内に供給された
燃焼用ガスが或る系路・部分で専ら流れるということが
なくなり、特にガス排出口を２カ所以上有する中子でも
各々の通気抵抗を等しくして中子全体に燃焼用ガスを行
き渡せ、中子残りを解消することができるようになっ
た。<Effects of the Invention> According to the method for removing a core of the present invention, the combustion gas supplied into the core does not flow exclusively through a certain system path / portion, and particularly, there are two or more gas discharge ports. Even with the cores, it is possible to eliminate the remaining cores by making the ventilation resistances of each core equal and allowing the combustion gas to be distributed throughout the cores.

従って、どのような形状の中子であろうとも従来の衝撃
付与法や砂焼き法に代えて、本発明に係るガス供給法を
適用することができる。該方法は上記従来法に比べて極
めて短時間（1/10〜1/50程度）で中子を除去できること
から、鋳造サイクルを早めること、即ち生産性を高める
ことができる。Therefore, whatever the shape of the core, the gas supply method according to the present invention can be applied instead of the conventional impact imparting method or sand baking method. Method because it can remove the core in an extremely short time (about 1 / 10-1 / 50) in comparison with the conventional method, provide a faster casting cycle, that is, to increase productivity.

しかも鋳物に、割れ、傷等の原因となる衝撃を与えるこ
となく中子を除去できることから、歩留りが向上すると
共に品質信頼性が高まる。その上、粘結剤を完全燃焼し
て中子を除去するため、その回収された中子砂は直ちに
再利用が可能となる。Moreover, since the core can be removed without giving an impact to the casting, which causes cracks, scratches, etc., the yield is improved and the quality reliability is enhanced. Moreover, since the binder is completely burned to remove the core, the recovered core sand can be immediately reused.

特にはアルミ鋳物のように注湯温度が低く注湯熱で中子
が加熱されない場合でも、鋳物を過度に加熱させないで
（砂焼き炉に入れないため大気で冷却される）中子を加
熱することができるため、本発明方法は低融点の鋳物の
製造に偉力を発揮する。In particular, even if the pouring temperature is low and the core is not heated by the pouring heat like aluminum casting, heat the casting without overheating the casting (it is cooled in the atmosphere because it is not placed in the sand-burning furnace). Therefore, the method of the present invention is very effective in the production of castings having a low melting point.

【図面の簡単な説明】[Brief description of drawings]

第１図は本発明の中子の除去方法の一実施例の説明図、 第２図は他の実施例の説明図、 第３図は一例の中子における従来方法の問題点の説明
図、 第４図は他の例の中子における従来方法の問題点の説明
図である。 図中： １…鋳物、２…中子 ４…充填材、５…排出口 ６…供給口、８…ガス供給治具 １０…燃焼用ガス、１１…通気抑制蓋 １２…ベントFIG. 1 is an explanatory view of an embodiment of a method for removing a core of the present invention, FIG. 2 is an illustration of another embodiment, and FIG. 3 is an illustration of problems of a conventional method in an example core, FIG. 4 is an explanatory diagram of a problem of the conventional method in the core of another example. In the figure: 1 ... Casting, 2 ... Core 4 ... Filler, 5 ... Discharge port 6 ... Supply port, 8 ... Gas supply jig 10 ... Combustion gas, 11 ... Ventilation suppression lid 12 ... Vent

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】鋳物中に鋳ぐるまれている有機粘結剤を用
いた中子に、有機粘結剤燃焼用ガスを供給せしめて中子
を鋳物から除去する方法において、ガス排出口付近で通
気抵抗をより大きくする手段を用いることを特徴とする
中子の除去方法。1. A method for removing a core from a casting by supplying a gas for burning an organic binding agent to a core using an organic binding agent which is cast in a casting, in the vicinity of a gas discharge port. A method for removing a core, characterized by using a means for increasing ventilation resistance. 【請求項２】通気抵抗をより大きくする手段が、ガス排
出口に押し当てられる、中子より大きな通気抵抗を有す
る部材であることを特徴とする特許請求の範囲第１項記
載の方法。2. The method according to claim 1, wherein the means for increasing the ventilation resistance is a member which is pressed against the gas outlet and has a ventilation resistance larger than that of the core. 【請求項３】通気抵抗をより大きくする手段が、ガス排
出口部位の中子を局部的に高密度にしておくことである
ことを特徴とする特許請求の範囲第１項記載の方法。3. The method according to claim 1, wherein the means for increasing the ventilation resistance is to locally densify the core of the gas outlet portion.
JP28034987A 1987-11-06 1987-11-06 How to remove the core Expired - Lifetime JPH0635047B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28034987A JPH0635047B2 (en) 1987-11-06 1987-11-06 How to remove the core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28034987A JPH0635047B2 (en) 1987-11-06 1987-11-06 How to remove the core

Publications (2)

Publication Number Publication Date
JPH01122658A JPH01122658A (en) 1989-05-15
JPH0635047B2 true JPH0635047B2 (en) 1994-05-11

Family

ID=17623768

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28034987A Expired - Lifetime JPH0635047B2 (en) 1987-11-06 1987-11-06 How to remove the core

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000146482A (en) * 1998-09-16 2000-05-26 China Petrochem Corp Heat exchanger tube, its manufacturing method, and cracking furnace or another tubular heating furnace using heat exchanger tube

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6672367B2 (en) * 1999-07-29 2004-01-06 Consolidated Engineering Company, Inc. Methods and apparatus for heat treatment and sand removal for castings
US6910522B2 (en) 1999-07-29 2005-06-28 Consolidated Engineering Company, Inc. Methods and apparatus for heat treatment and sand removal for castings
DE102014110826A1 (en) * 2014-07-30 2016-02-04 Fritz Winter Eisengiesserei Gmbh & Co. Kg Method for casting castings
CN107532268B (en) 2015-04-28 2019-12-03 联合工程公司 System and method for being heat-treated to aluminium alloy castings

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000146482A (en) * 1998-09-16 2000-05-26 China Petrochem Corp Heat exchanger tube, its manufacturing method, and cracking furnace or another tubular heating furnace using heat exchanger tube
JP2007255888A (en) * 1998-09-16 2007-10-04 China Petrochem Corp Heat exchanger tube, cracking furnace and tubular heating furnace using it

Also Published As

Publication number Publication date
JPH01122658A (en) 1989-05-15

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