JPS58148043A - Production of casting mold - Google Patents
Production of casting moldInfo
- Publication number
- JPS58148043A JPS58148043A JP3107882A JP3107882A JPS58148043A JP S58148043 A JPS58148043 A JP S58148043A JP 3107882 A JP3107882 A JP 3107882A JP 3107882 A JP3107882 A JP 3107882A JP S58148043 A JPS58148043 A JP S58148043A
- Authority
- JP
- Japan
- Prior art keywords
- steel balls
- sand
- hardener
- acid
- binder
- 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.)
- Granted
Links
- 238000005266 casting Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 239000011347 resin Substances 0.000 claims abstract description 16
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 4
- 239000003110 molding sand Substances 0.000 claims abstract 4
- 239000003795 chemical substances by application Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 12
- 239000004576 sand Substances 0.000 abstract description 34
- 239000011230 binding agent Substances 0.000 abstract description 24
- 239000007849 furan resin Substances 0.000 abstract description 13
- 229910052845 zircon Inorganic materials 0.000 abstract description 13
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 abstract description 13
- 239000002253 acid Substances 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000002378 acidificating effect Effects 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 6
- 239000004848 polyfunctional curative Substances 0.000 abstract 5
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は溶場が適切な凝固状態を示す鋳型の製造方法に
関し、更に詳しくは鋳物の肌に接する鋳臘の部分（以下
鋳肌面という）を特定の処理を施し九鋼球と鋳物砂との
混合物で成型することを特徴とする自ｉＩ性鋳履の製造
方法に関するものである０
鋳物の製造においては、肉厚部のＩＩ園が遅い場合には
黒鉛が粗大化し、肉厚部と肉薄部の交叉部では凝圃適直
Ｏ羞に起因すゐ引は巣や亀裂が発生する。これらの問題
点を第決する目的で従来鋳温の鋳肌ｗＫ振板状冷し金が
使用されているＯしかしながら、この場合、冷し金に接
した鋳物の表面ＫＦｉ鋳じわが発生し、冷し金と砂蓋部
の境に段差が生じ、グラインダー仕上作業が必要とな如
、作業金体の工数が数倍かかる欠点がある。）更に１冷
し金の黒鉛組織が溶湯熱で破壊され冷却効果が低下する
ので、冷し金材としては３（ロ）程度しか使用出来ない
。そこでかかる欠点を解消するために本発明者等は安価
な鋼球を用いる方法な別に提案し九。即ちこの方法は、
鋳蓋の鋳肌面をつくるに当って、鋼球にジルコン砂。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a mold in which the melt field exhibits an appropriate solidification state, and more specifically, the present invention relates to a method for manufacturing a mold in which the melt field is in an appropriate solidification state, and more specifically, the part of the casting ladle that comes into contact with the skin of the casting (hereinafter referred to as the casting surface) is subjected to a specific treatment. This invention relates to a method for producing self-proportioned sandals characterized by molding with a mixture of steel balls and foundry sand. At the intersection of the thick and thin parts, cavities and cracks occur due to the stress caused by the stiffness of the field. In order to solve these problems, conventionally, a casting surface wK shaking plate type chiller at casting temperature is used. However, in this case, KFi casting wrinkles occur on the surface of the casting in contact with the chiller, and There is a difference in level between the metal plate and the sand cover, which requires finishing work using a grinder, and the number of man-hours required for the metal body is several times longer. ) Furthermore, since the graphite structure of 1-chilled gold is destroyed by the heat of the molten metal and the cooling effect is reduced, only about 3 (b) can be used as a chilled metal material. In order to overcome this drawback, the present inventors proposed a method using inexpensive steel balls. That is, this method is
To create the cast surface of the cast lid, zircon sand is applied to the steel ball.
クロマイト砂、ｉ１伊勢を混合し、粘結剤で成層したも
のを冷し金材として用いる方法である。This is a method in which chromite sand and i1 ise are mixed and layered with a binder and used as a cold metal material.
この場金鉱造瀝作業については従来通りの作業で農く、
冷し金材を必要とする肉厚部及びコーナ一部にフェース
サンド的に用いる。この方法を用いると、板状の冷し金
では成淑が不可能なコーナ一部の冷却が可能となシ、鋳
物の表面に鋳じわ中段差が生じず、板状の冷し金を用い
九場金と比較して形状及び寸法Ｎ＆が向上し、仕上工数
が大巾に低減できる。しかしながら、かかる方法は以下
に示すような欠点を有する。At this time, the gold mining work will be carried out as usual.
Used as a face sand for thick parts and corners that require cold metal material. By using this method, it is possible to cool some corners that cannot be achieved with plate-shaped chilled metals, and there is no difference in the middle level between the casting wrinkles on the surface of the casting. The shape and dimensions N& are improved compared to the Kuba gold used, and the finishing man-hours can be greatly reduced. However, such a method has the following drawbacks.
即ち、近年、フラン樹脂を代表例とする酸硬化性バイン
ダー＊ｙｘからなる有機粘結剤が自硬性鋳履用粘結剤の
主流を占めるに到っており、このようなｍ硬化性バイン
ダー樹脂は、硬化剤である酸と接触すると急激な硬化反
応が生じるのが通例である。そのために鋳型用骨材に粘
結剤を被覆する場合には、最初に酸性の硬化剤を添加す
る。従って上記の如く骨材の一部に鋼球を用いる場合に
は、硬化鋼である酸が鋼球と反応して消費されるので、
鋳物砂のみを使用した場合より大巾に硬化剤添加量が増
加するという欠点があった。さらに、鋼球からのさびが
再生砂Ｋｍ人して、再生砂の性能を劣化させるという問
題も生じる。That is, in recent years, organic binders consisting of acid-curable binders *yx, of which furan resin is a typical example, have become the mainstream of self-hardening binders for foundries, and such m-curable binder resins Usually, when it comes into contact with an acid, which is a curing agent, a rapid curing reaction occurs. For this purpose, when coating the molding aggregate with a binder, an acidic curing agent is first added. Therefore, when steel balls are used as part of the aggregate as described above, the acid that is hardened steel reacts with the steel balls and is consumed.
There was a drawback that the amount of hardening agent added was significantly greater than when only foundry sand was used. Furthermore, the problem arises that rust from the steel balls is absorbed into the recycled sand, deteriorating the performance of the recycled sand.
又、通常、ミキサーを用いて鋳物砂表面に粘結剤を被覆
するＫは、最初に硬化剤を添加して混合し、ついで酸硬
化性バインダー樹脂を添加して拠金する。しかしながら
、鋼球を用いる方法においては鋼球が鋳物砂の３倍近い
かさ比重を示すので、ミキサーのモーターに大きな負荷
を与え、短時間に鋼球表面に粘結剤を均一に被覆するの
が困難である。又、混線時間が延艇されると、混合中に
バインダーＩＩ！脂の硬化が連行し、置とめ後の鋳型強
度が大巾に低下するという欠点がある。このように％ｌ
ｌ硬化性バインダー樹脂を粘結剤とする鋳！ＩＩＩにお
いて鋼球を冷し金材として用いるＫは、種々の問題点が
存在することが見出され丸。Further, when coating a binder on the surface of foundry sand using a mixer, a curing agent is first added and mixed, and then an acid-curable binder resin is added and deposited. However, in the method using steel balls, the bulk specific gravity of the steel balls is nearly three times that of foundry sand, so it is difficult to apply a large load to the mixer motor and uniformly coat the surface of the steel balls with the binder in a short time. Have difficulty. Also, if the mixing time is extended, Binder II! There is a drawback that the hardening of the fat is accompanied by a significant decrease in the strength of the mold after it is set in place. Like this %l
Casting using curable binder resin as a binder! In III, it was found that K, which uses steel balls as the cooling material, has various problems.
そこで本発明者等は、これらの欠点のない酸硬化性バイ
ンダー樹脂を粘結剤として用い、鋼球を冷し金材として
用いる鋳童の製造方法を兇い出すべく鋭意努力研究した
結果、鋼球は形状が球状であるために表面上の粘結剤が
砂粒表面へ移行し中すい現象に着目して、本発明を完敗
するに到つ九のである。Therefore, the inventors of the present invention have worked hard to develop a method for manufacturing casting irons that uses acid-curing binder resin as a binder and steel balls as cold metal materials, which do not have these drawbacks. Since the sphere is spherical in shape, the binder on the surface migrates to the surface of the sand grains, which leads to the failure of the present invention.
すなわち１本発明は、鋳臘の鋳肌面を酸硬化性バインダ
ー樹脂で表面を被覆した一球と、−゛北側で表両を被覆
した鋳物砂との混合−で成飄することを４Ｉ像とする自
硬性鋳製の製造方法を提供するものである。In other words, the present invention is based on the 4I image, in which the casting surface of the casting pot is mixed with one ball whose surface is coated with an acid-curable binder resin, and - with foundry sand whose surfaces are coated on both sides on the north side. The present invention provides a method for manufacturing self-hardening casting.
本発明において、酸硬化性バインダー樹脂としては、鋳
物砂用粘結剤として用いられるすべての公知の樹脂を用
いることができる０又、鋳物砂用粘結剤がフラン樹脂の
場合は、ホモポリマーであってもコポリマーであっても
よく、コポリマーの場合にはポリマーの構成モノマー成
分にフル７リルアルコール４Ｌ＜はフルフラールを必須
成分として會むものであればよい０バインダー樹脂の粘
度は、鋼球への被覆を容易にする九めに低粘度であるこ
とが好ましい０又、本発明に用いられる硬化剤としては
、供試バインダー樹脂に組合されて使用される酸性硬化
剤であればいずれでもよいＯ
本発ＩｊＩにおいて用いられる鋼球は砂の径の２〜３０
倍、好ましくは２〜Ｓ倍の大きさであるＯ又、鋳物砂と
しては硼砂の他にジルコン砂、クロマイト砂等の通常装
置用骨材として使用できるものであればよいが、冷却能
の面からジルコン砂、クロマイト砂の使用が好ましい０
以下に実施例を示し、本発明の詳細な説明する０
実施例 １
直径３１１ｍ１の鋼球４００（１（１ｔｌをフラン樹脂
（商品名墨カオーライトナー ５４０Ｂ ）中ＶＣ投入
後取出し、遠心分離器で１分間処理することｙｃよプ、
フラン樹脂１６１を表面に被覆した剛球を得九。ついで
、ミキサー内にジルコン砂ｚａａ。In the present invention, as the acid-curable binder resin, all known resins used as binders for foundry sand can be used.Also, when the binder for foundry sand is furan resin, homopolymer resins can be used. In the case of a copolymer, it is sufficient that the monomer component of the polymer contains furfural as an essential component.The viscosity of the binder resin is determined by the The curing agent used in the present invention preferably has a low viscosity to facilitate coating.In addition, any acidic curing agent that is used in combination with the binder resin under test may be used as the curing agent. The steel balls used in IjI are 2 to 30 mm in diameter from the sand.
2 times, preferably 2 to S times the size.Also, as the foundry sand, in addition to borax sand, zircon sand, chromite sand, etc., which can be used as aggregate for ordinary equipment, may be used, but in terms of cooling ability. It is preferable to use zircon sand or chromite sand.
Examples will be shown below to provide a detailed explanation of the present invention.Example 1 400 (1 tl) steel balls with a diameter of 311 m1 were taken out after putting VC into furan resin (trade name Black Kaolite Toner 540B), and placed in a centrifugal separator. Please process it for a minute.
A hard ball whose surface was coated with furan resin 161 was obtained. Next, add zircon sand to the mixer.
ｆ （１ｔ１を投入し、硬化剤（商品名；カオーライト
ナー ’！’に−１） ８ ｆを添加し１分間混合した
０この硬化剤を被覆したジルコン砂にフラン樹脂を被覆
した鋼球４００．１を加え、ミキサーで５０秒間混合し
、鋼球とジルコン砂とを均一に混合した。f (added 1 t1, hardening agent (product name: kaolite toner '!' -1) 8 f and mixed for 1 minute, 0 steel balls coated with furan resin on zircon sand coated with this hardening agent 400. 1 was added and mixed for 50 seconds using a mixer to uniformly mix the steel balls and zircon sand.
この混合物を５０關Ｘ５０ｍφのポリ塩化ビニル製枠内
に充填して強度試験片を作製し、気温２５℃、８１度５
５ｇ６の条件下に放置した。各時間毎に試験片を型枠よ
り取シ出して抗圧力を測定し、表−１の結果を得た。This mixture was filled into a polyvinyl chloride frame of 50 mm x 50 mφ to prepare a strength test piece.
It was left under the condition of 5g6. A test piece was taken out from the mold at each time and the resistance pressure was measured, and the results shown in Table 1 were obtained.
実施例 ２
鋼球４０００ｆｔ＜キサ−に投入し、フラン樹脂（商品
名−カオーライトナー ！５４ＱＢ） １６ ｆを添加
して１分間混合しフラン樹脂を被覆した鋼球を得九。こ
のフラン樹脂を被覆した鋼球に硬化剤（商品堪；カオー
ライトナー ＴＫ−５） ８ｆを被覆し九ジルコン砂２
８００１を投入し５０秒間混合し、鋼球とジルコン砂と
を均一に混合した。この混合物を用いて実施例１と同様
に試験片の抗圧力を測定し、表−１の結果を得たＯ本集
施例の如くミキサーを用いて鋼球にフラン樹脂を被覆し
九場合には、７ラン樹脂の一部がミキサーの壁中羽根に
付着し、鋼球の被覆に使われるフランｍＭ脂量が減少す
る丸めに２４時間強度が実施例１の場合に比べやや低下
した０比較例 １
ミキサーを用いて鋼球に硬化剤８ｆ、ジルコン砂にフラ
ン樹脂１４ｆｔ−禎覆し九〇すなわち、実施例２と逆に
鋼球にＦｉ硬化剤、ジルコン砂にはフラン樹脂を着覆し
九〇以俵の操作はＶ＆麹例硬化剤を鋼球に添加した場合
には、硬化剤が鋼球と反応して消費された九めに５０分
後でも鋳ａｔ＋は硬化し危かった。Example 2 4000 ft of steel balls were placed in a mixer, 16 f of furan resin (trade name: Kaolite Toner !54QB) was added and mixed for 1 minute to obtain steel balls coated with furan resin. This furan resin-coated steel ball was coated with 8f of hardening agent (Kaolite Toner TK-5) and 9 zircon sand 2
8001 was added and mixed for 50 seconds to uniformly mix the steel balls and zircon sand. Using this mixture, the resistance pressure of the test piece was measured in the same manner as in Example 1, and the results shown in Table 1 were obtained. The 24-hour strength was slightly lower than that of Example 1 due to a part of the 7-run resin adhering to the blades in the wall of the mixer and a decrease in the amount of furan mM fat used to coat the steel balls. Example 1 Using a mixer, coat the steel balls with 8f of hardening agent and zircon sand with 14ft of furan resin. That is, in the opposite way to Example 2, coat the steel balls with Fi hardening agent and coat the zircon sand with furan resin.90 In this operation, when the V&Koji sample hardening agent was added to the steel balls, the cast at+ was dangerous because it hardened even after 50 minutes when the hardening agent reacted with the steel balls and was consumed.
またジルコン砂上のフラン樹脂は鋼球へ移行しＫくいた
めに２４時間強度も低下している。In addition, the furan resin on the zircon sand migrates to the steel balls, reducing the 24-hour strength.
比較例 ２
ミキサーに鋼球４０００Ｆとジルコン砂２８０Ｃｆを投
入し、硬化剤８ｔを加え１分間混合し、次にフラン樹脂
１４ｔを加え１分間混合した。Comparative Example 2 4000F steel balls and 280Cf zircon sand were put into a mixer, 8t of hardening agent was added and mixed for 1 minute, and then 14t of furan resin was added and mixed for 1 minute.
この混合物を用いて実施例１と同様に試験片の抗圧力を
測定し、表−１の結果を得た。Using this mixture, the resistance pressure of the test piece was measured in the same manner as in Example 1, and the results shown in Table 1 were obtained.
比較例 ５
比較例２では、硬化剤の一部が鋼球と反応（７て消費さ
れたので、硬化剤添加量を１２ｆに増加し、以後の操作
は比較例２と同様に行い、表−１の結果を得た。−
硬化剤量を増すことＫよシ５０分後の！＆ｉ度は増加し
たが、２４時間強ｆｆｉは実施例１及び２と比較して大
巾に低下し九。Comparative Example 5 In Comparative Example 2, a part of the hardening agent reacted with the steel balls (7) and was consumed, so the amount of hardening agent added was increased to 12f, and the subsequent operations were performed in the same manner as in Comparative Example 2. - By increasing the amount of curing agent, the temperature after 50 minutes increased, but the 24-hour ffi decreased significantly compared to Examples 1 and 2.
以上詳述し九如く、本発明によれば少量の硬化剤を用い
て速硬化で高強度の鋳型が提供される０
表−１抗圧力の−ｊ定結果As described in detail above, according to the present invention, a fast-curing and high-strength mold is provided using a small amount of curing agent.
Claims (1)
樹脂で表面を被覆した鋼球と、硬化剤で表面を被覆した
鋳物砂との混合物で成型することを特徴とする自碩性鋳
−の製造方法０A self-sharpening method characterized by molding the parts that come into contact with the skin of the casting with a mixture of a steel ball whose surface is coated with acid-curing resin and molding sand whose surface is coated with a hardening agent. Casting manufacturing method 0
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3107882A JPS58148043A (en) | 1982-02-26 | 1982-02-26 | Production of casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3107882A JPS58148043A (en) | 1982-02-26 | 1982-02-26 | Production of casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58148043A true JPS58148043A (en) | 1983-09-03 |
| JPS612452B2 JPS612452B2 (en) | 1986-01-24 |
Family
ID=12321390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3107882A Granted JPS58148043A (en) | 1982-02-26 | 1982-02-26 | Production of casting mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58148043A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658504A (en) * | 2013-11-26 | 2014-03-26 | 滁州金诺实业有限公司 | Novel process for sand casting of aluminium alloy casting blanks |
| CN104308156A (en) * | 2014-11-13 | 2015-01-28 | 四川南车共享铸造有限公司 | Composition for three-dimensional print casting and applications thereof |
| CN105108033A (en) * | 2015-08-11 | 2015-12-02 | 安徽省胜峰机械有限公司 | High-breathability shell powder-contained modified furan resin sand for steel castings and preparation method thereof |
| CN106734859A (en) * | 2017-02-27 | 2017-05-31 | 李水金 | A kind of high thermal conductive resin sand and its production method |
| CN106734893A (en) * | 2016-11-29 | 2017-05-31 | 贵州安吉航空精密铸造有限责任公司 | A kind of method for solving light-alloy sand-cast rarefaction defect |
-
1982
- 1982-02-26 JP JP3107882A patent/JPS58148043A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658504A (en) * | 2013-11-26 | 2014-03-26 | 滁州金诺实业有限公司 | Novel process for sand casting of aluminium alloy casting blanks |
| CN104308156A (en) * | 2014-11-13 | 2015-01-28 | 四川南车共享铸造有限公司 | Composition for three-dimensional print casting and applications thereof |
| CN105108033A (en) * | 2015-08-11 | 2015-12-02 | 安徽省胜峰机械有限公司 | High-breathability shell powder-contained modified furan resin sand for steel castings and preparation method thereof |
| CN106734893A (en) * | 2016-11-29 | 2017-05-31 | 贵州安吉航空精密铸造有限责任公司 | A kind of method for solving light-alloy sand-cast rarefaction defect |
| CN106734859A (en) * | 2017-02-27 | 2017-05-31 | 李水金 | A kind of high thermal conductive resin sand and its production method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS612452B2 (en) | 1986-01-24 |
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