JPH0246295B2 - CHUZOSOCHINOYUMICHOSHOSHITSUMOKEI - Google Patents
CHUZOSOCHINOYUMICHOSHOSHITSUMOKEIInfo
- Publication number
- JPH0246295B2 JPH0246295B2 JP18706087A JP18706087A JPH0246295B2 JP H0246295 B2 JPH0246295 B2 JP H0246295B2 JP 18706087 A JP18706087 A JP 18706087A JP 18706087 A JP18706087 A JP 18706087A JP H0246295 B2 JPH0246295 B2 JP H0246295B2
- Authority
- JP
- Japan
- Prior art keywords
- runner
- model
- disappearing
- molten metal
- foundry 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 - Lifetime
Links
- 239000004576 sand Substances 0.000 claims description 19
- 238000009423 ventilation Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 12
- 239000002184 metal Substances 0.000 description 34
- 239000007789 gas Substances 0.000 description 24
- 239000003110 molding sand Substances 0.000 description 10
- 238000005979 thermal decomposition reaction Methods 0.000 description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008034 disappearance Effects 0.000 description 2
- 239000004794 expanded polystyrene Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、鋳造装置に使用される発泡プラス
チツク製の湯道用消失模型に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a disappearing model for a runner made of foamed plastic used in a casting machine.
（従来の技術）
鋳造装置には、湯口から鋳物砂内に形成された
鋳型に連なる湯道を発泡プラスチツク製の消失模
型で成形するようにしたものがある。この場合、
湯口に溶湯を注入すると、上記消失模型はこの溶
湯により熱分解しながら鋳物砂内に順次湯道を形
成し、この湯道を上記溶湯が鋳型に向つて流動す
るようになつている。このような消失模型を用い
れば、湯道の成形が容易であるため、鋳造装置に
は従来より利用されている。(Prior Art) Some casting apparatuses are designed to form a runner connected from a sprue to a mold formed in foundry sand using an extinguishable mold made of foamed plastic. in this case,
When molten metal is poured into the sprue, the disappearing model is thermally decomposed by the molten metal and sequentially forms runners in the foundry sand, through which the molten metal flows toward the mold. Since it is easy to form a runner using such a vanishing model, it has been conventionally used in casting equipment.
（発明が解決しようとする問題点）
ところで、上記のように湯道用消失模型が熱分
解するときには、この消失模型はCOやCH4のよ
うなガスとなり、このガスは多量に、かつ、激し
く発生する。この場合、このガスが鋳物砂内に円
滑に吸収されずに、湯道内に残留すると、例え
ば、この残留ガスが溶湯を逆流させて湯道の湯口
から吹き出させることがある。また、上記残留ガ
スが溶湯の流れを乱すことにより、この溶湯が湯
道の内壁に損傷を与え、このため、この溶湯が鋳
物砂を巻き込んで鋳造品に砂入り欠陥を生じさせ
ることがある。(Problem to be solved by the invention) By the way, when the vanishing model for runners thermally decomposes as described above, this vanishing model turns into gas such as CO and CH 4 , and this gas is produced in large quantities and violently. Occur. In this case, if this gas is not smoothly absorbed into the foundry sand and remains in the runner, for example, this residual gas may cause the molten metal to flow backwards and blow out from the sprue of the runner. In addition, the residual gas may disrupt the flow of the molten metal, causing damage to the inner wall of the runner, which may cause the molten metal to entrain foundry sand and cause sand inclusion defects in the cast product.
（発明の目的）
この発明は、上記のような事情に注目してなさ
れたもので、湯道用消失模型の熱分解で発生する
ガスが湯道内に残留しないようにして、溶湯が湯
道を円滑に流動できるようにすることを目的とす
る。(Objective of the Invention) This invention was made in view of the above-mentioned circumstances, and is designed to prevent the gas generated by the thermal decomposition of the disappearing model for runners from remaining in the runners, and to prevent the molten metal from flowing through the runners. The purpose is to allow smooth flow.
（発明の構成）
上記目的を達成するためのこの発明の特徴とす
るところは、湯道用消失模型の内部にその長手方
向に沿つて通気孔を形成し、鋳型側における上記
通気孔の端部が鋳物砂内に開放されるようにした
点にある。(Structure of the Invention) A feature of the present invention for achieving the above object is that a ventilation hole is formed inside the disappearing model for a runner along its longitudinal direction, and the end of the ventilation hole on the mold side is made so that it is released into the foundry sand.
（実施例）
以下、この発明の実施例を図面により説明す
る。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
（第１実施例）
第１図及び第２図は第１実施例を示している。
図において、１は鋳造装置で、この鋳造装置１は
金枠２とこの金枠２内に充填される鋳物砂３とを
有している。この鋳物砂３内には、発泡スチロー
ル製の鋳型用消失模型５が複数埋め込まれて鋳型
６が成形される。また、上記鋳型用消失模型５と
同様の発泡スチロール製の湯道用消失模型７が埋
め込まれて湯道８が成形されており、この湯道用
消失模型７に上記各鋳型用消失模型５が順次連結
されている。上記金枠２の上面を覆う通気性のな
いプラスチツク製シート１０が設けられ、これら
金枠２とシート１０とに囲まれた空間に上記鋳物
砂３、及び両消失模型５，７が封入されている。(First Embodiment) FIGS. 1 and 2 show a first embodiment.
In the figure, 1 is a casting device, and this casting device 1 has a metal frame 2 and molding sand 3 filled in this metal frame 2. A plurality of disappearing mold molding models 5 made of expanded polystyrene are embedded in the molding sand 3 to form a mold 6. In addition, a runner runner model 7 made of expanded polystyrene similar to the mold runner model 5 is embedded to form a runner 8, and each mold runner model 5 is sequentially inserted into the runner runner model 7. connected. A non-ventilated plastic sheet 10 is provided to cover the upper surface of the metal frame 2, and the molding sand 3 and both disappearing models 5 and 7 are enclosed in the space surrounded by the metal frame 2 and the sheet 10. There is.
上記金枠２はその底部と側部とが二重構造とな
つている。即ち、この金枠２は上部が開口した箱
状の金枠本体１１と、この金枠本体１１内に嵌め
込まれ上部が開口した金網体１２とを有し、金網
体１２内に上記鋳物砂３が充填され、金枠本体１
１と金網体１２との間は空隙１３となつている。
上記金網体１２は網目が200メツシユ程度である。
なお、上記金枠２はその底部のみが二重構造であ
つてもよく、上記金網体１２の代りに通気性のあ
る多孔板を使用してもよい。 The metal frame 2 has a double structure at the bottom and sides. That is, this metal frame 2 has a box-shaped metal frame main body 11 with an open top, and a wire mesh body 12 fitted into the metal frame main body 11 with an open top. is filled, and the metal frame body 1
1 and the wire mesh body 12 is a gap 13.
The wire mesh body 12 has a mesh size of about 200 meshes.
The metal frame 2 may have a double structure only at its bottom, and instead of the wire mesh body 12, a perforated plate with air permeability may be used.
上記鋳造装置１の底部における空隙１３には吸
引パイプ１５が配設され、この吸引パイプ１５の
一端側で空隙１３における部分は多数の小孔１６
を有している。また、上記吸引パイプ１５の他端
側は金枠本体１１を貫通して真空ポンプ１７に接
続されている。１８は溶湯を注入する堰鉢であ
る。 A suction pipe 15 is disposed in the cavity 13 at the bottom of the casting apparatus 1, and a portion of the cavity 13 at one end of the suction pipe 15 has a large number of small holes 16.
have. The other end of the suction pipe 15 passes through the metal frame body 11 and is connected to a vacuum pump 17. 18 is a weir bowl into which molten metal is poured.
上記構成において、湯道用消失模型７は断面円
形で、側面視ほぼＵ字状をなし、その一端が堰鉢
１８の湯口１８ａに対応するよう鋳物砂３の上面
にまで延びており、一方、他端は鋳物砂３内に位
置している。この湯道用消失模型７の他端には椀
状体２１が一体成形されており、その上面は前記
金網体１２と同じ網目の金網２２で覆われてい
る。そして、この金網２２により椀状体２１の空
間２１ａに鋳物砂３が流入することは防止されて
いる。 In the above configuration, the runner model 7 has a circular cross section and is almost U-shaped when viewed from the side, and one end thereof extends to the upper surface of the molding sand 3 so as to correspond to the sprue 18a of the weir bowl 18. The other end is located within the foundry sand 3. A bowl-shaped body 21 is integrally molded on the other end of this disappearing model 7 for a runner, and its upper surface is covered with a wire mesh 22 having the same mesh as the wire mesh body 12. The metal mesh 22 prevents the molding sand 3 from flowing into the space 21a of the bowl-shaped body 21.
また、上記湯道用消失模型７の内部にはその軸
心上を延びる通気孔２３が形成されている。この
通気孔２３の一端は湯道用消失模型７の上記一端
上面に開放してシート１０を介して湯口１８ａに
対向しており、また、同上通気孔２３の他端は椀
状体２１の空間２１ａに開放している。 Further, a ventilation hole 23 is formed inside the runner model 7 to extend along its axis. One end of this ventilation hole 23 is open to the upper surface of the one end of the disappearing model 7 for a runner and faces the sprue 18a through the sheet 10, and the other end of the same ventilation hole 23 is opened to the upper surface of the one end of the disappearing model 7 for a runner, and the other end of the ventilation hole 23 is opened to the upper surface of the one end of the disappearing model 7 for a runner, and faces the sprue 18a through the sheet 10. It is open to 21a.
更に、上記湯道用消失模型７の長手方向中途部
断面積は、上記一端側から他端側へ向つて進むに
従い段階的に小さくなつている。即ち、上記湯道
用消失模型７はその一端側から他端側に向つて順
次大径部２４、中径部２５、小径部２６で形成さ
れている。 Furthermore, the longitudinal cross-sectional area of the disappearing model 7 for a runner 7 gradually decreases as it progresses from the one end side to the other end side. That is, the disappearing model 7 for a runner is formed of a large diameter part 24, a medium diameter part 25, and a small diameter part 26 in order from one end to the other end.
上記構成により、鋳造を行う場合につき説明す
る。 A case in which casting is performed using the above configuration will be explained.
まず、真空ポンプ１７の作動により空隙１３か
ら吸引パイプ１５の小孔１６を通して空気を吸引
し、同上金枠２の内部を減圧させる（図中矢印Ａ
図示）。次に、上記堰鉢１８に溶湯を注入すれば
（図中矢印Ｂ図示）、この溶湯がシート１０を熱分
解して突き破り、湯道用消失模型７の一端に接す
る。すると、上記溶湯が、図中Ｃで示す流動方向
に沿つて、順次湯道用消失模型７を熱分解して湯
道８を形成する。そして、湯道用消失模型７の代
りに溶湯が湯道８内に充満し、この溶湯が鋳型用
消失模型を熱分解してこの鋳型用消失模型５の代
りに鋳型６内に充満し、これによつて鋳造がなさ
れる。 First, by operating the vacuum pump 17, air is sucked from the gap 13 through the small hole 16 of the suction pipe 15 to reduce the pressure inside the metal frame 2 (arrow A in the figure).
(Illustrated). Next, when molten metal is injected into the weir bowl 18 (as shown by arrow B in the figure), the molten metal thermally decomposes and breaks through the sheet 10 and comes into contact with one end of the runner model 7. Then, the molten metal sequentially thermally decomposes the runner dissipation model 7 to form the runner 8 along the flow direction indicated by C in the figure. Then, the runner 8 is filled with molten metal instead of the disappearing model 7 for the runner, and this molten metal thermally decomposes the disappearing model for the mold and fills the mold 6 instead of the disappearing model 5 for the mold. Casting is done by.
上記の場合、金枠２の内部が減圧状態で酸素が
希薄なため、溶湯が両消失模型５，７を熱分解す
るときにこれらの燃焼が抑制される。このため、
上記両消失模型５，７は溶湯により熱分解される
とき、CO及びCH4ガスやスチロールモノマーと
なり、これらは鋳物砂３内に吸収される。 In the above case, since the inside of the metal frame 2 is in a reduced pressure state and oxygen is thin, combustion of the two vanishing models 5 and 7 is suppressed when the molten metal thermally decomposes the two vanishing models 5 and 7. For this reason,
When the two disappearing models 5 and 7 are thermally decomposed by the molten metal, they become CO and CH 4 gases and styrene monomers, which are absorbed into the foundry sand 3.
また、上記湯道用消失模型７の熱分解で発生す
るガスのうち、湯道８の外周部で発生するガスは
直接減圧状態の鋳物砂３内に流入する。一方、湯
道８の内部側で発生するガスは、そのガス圧力に
より上記通気孔２３内を湯口１８ａ側の一端側か
ら空間２１ａ側の他端側に向つて流動し、このガ
スは上記椀状体２１の空間２１ａから減圧状態の
鋳物砂３内に流入する（図中矢印Ｄ図示）。従つ
て、上記湯道用消失模型７の熱分解で発生するガ
スは上記のように二つのルートを通つて鋳物砂３
内に円滑に吸収されることになる。 Furthermore, among the gases generated by thermal decomposition of the runner-use disappearing model 7, the gas generated at the outer peripheral portion of the runner 8 directly flows into the foundry sand 3 under reduced pressure. On the other hand, the gas generated inside the runner 8 flows in the vent hole 23 from one end on the sprue 18a side to the other end on the space 21a side due to the gas pressure, and this gas flows in the bowl shape. It flows into the molding sand 3 under reduced pressure from the space 21a of the body 21 (as indicated by arrow D in the figure). Therefore, the gas generated by the thermal decomposition of the disappearing model 7 for the runner passes through the two routes as described above to the foundry sand 3.
It will be absorbed smoothly into the body.
上記の場合、上記湯道用消失模型７に通気孔２
３が形成されているため、湯道８の体積に対して
湯道用消失模型７の体積は少なくてすみ、よつ
て、その分、熱分解で発生するガスも少量とな
る。また、上記通気孔２３の内径はφ5ミリメー
トル以上φ15ミリメートル以下が好ましい。即
ち、上記通気孔２３の内径がφ5ミリメートルよ
りも小さい場合には、この通気孔２３内を流動す
るガスの流量が規制され、このガスを円滑に流動
させることできない。一方、上記通気孔２３の内
径がφ15ミリメートルよりも大きい場合には、湯
道用消失模型７の外径との関係でその肉厚が薄く
なつてこの湯道用消失模型７の強度が低下し、湯
道用消失模型７を鋳物砂３内に埋め込むときにこ
の鋳物砂３により湯道用消失模型７が損傷するお
それがある。 In the above case, the ventilation hole 2 is installed in the disappearing model 7 for the runner.
3 is formed, the volume of the runner dissipation model 7 is small compared to the volume of the runner 8, and therefore, the amount of gas generated by thermal decomposition is also reduced accordingly. Further, the inner diameter of the vent hole 23 is preferably φ5 mm or more and φ15 mm or less. That is, if the inner diameter of the vent hole 23 is smaller than 5 mm, the flow rate of the gas flowing through the vent hole 23 is restricted, and the gas cannot flow smoothly. On the other hand, if the inner diameter of the ventilation hole 23 is larger than φ15 mm, its wall thickness becomes thinner in relation to the outer diameter of the disappearing runner model 7, and the strength of the disappearing runner model 7 decreases. When the disappearing model 7 for a runner is embedded in the molding sand 3, there is a risk that the disappearing model 7 for a runner may be damaged by the foundry sand 3.
ところで、上記湯道８は、その一端側から他端
側に向つて進むに従い、即ち、溶湯の流動方向Ｃ
の下流側に進むに従い溶湯が各鋳型６内に順次充
満してゆくため、溶湯は下流側ほど少量となる。
従つて、上記下流側ほど湯道８の内径も小さくて
済む。また、湯道用消失模型７はその体積が小さ
い程熱分解により発生するガスは少量となる。 By the way, as the runner 8 advances from one end side to the other end side, that is, in the flow direction C of the molten metal,
Since the molten metal sequentially fills each mold 6 as it moves downstream, the amount of molten metal becomes smaller as it goes downstream.
Therefore, the inner diameter of the runner 8 can be made smaller toward the downstream side. Moreover, the smaller the volume of the disappearing model 7 for the runner, the smaller the amount of gas generated by thermal decomposition.
そこで、この実施例では、前記したように湯道
用消失模型７の長手方向中途部断面積を、上記一
端側から他端側へ向つて進むに従い段階的に小さ
くしてあり、そのため、溶湯の量に適した湯道８
が得られ、かつ、上記湯道用消失模型７の熱分解
で発生するガスも少量に抑えられ、これは通気孔
２３を通るなどして減圧状態の鋳物砂３内に効果
的に吸収されることになる。 Therefore, in this embodiment, as described above, the longitudinal cross-sectional area of the disappearing model 7 for the runner is made gradually smaller as it progresses from the one end side to the other end side. Hot water path suitable for quantity 8
is obtained, and the gas generated by the thermal decomposition of the disappearing model 7 for runners is also suppressed to a small amount, which is effectively absorbed into the foundry sand 3 under reduced pressure through the ventilation holes 23 etc. It turns out.
（第２実施例）
第３図は第２実施例を示し、その基本構成と基
本作用は上記第１実施例と同様である。よつて、
共通の構成については単に図面にその符号を付し
てその説明を省略し、異なる構成についてのみ説
明する。(Second Embodiment) FIG. 3 shows a second embodiment, the basic configuration and basic operation of which are the same as those of the first embodiment. Then,
Common configurations are simply given their reference numerals in the drawings and their explanations are omitted, and only different configurations will be explained.
図において、シート１０上には鋳物砂３′が薄
く敷かれており、この鋳物砂３′はその重量によ
り金枠２内の気密性を向上させている。 In the figure, molding sand 3' is thinly spread on the sheet 10, and the molding sand 3' improves the airtightness within the metal frame 2 due to its weight.
湯道用消失模型７はそれぞれ別体に成形された
大径部２４、中径部２５及び小径部２６で構成さ
れ、これらは鋳物砂３内で互いに連結されてい
る。また、上記大径部２４の上流側端と堰鉢１８
の湯口１８ａとの間には陶製の円管３０が介在し
ている。この円管３０の内孔は湯道８′であり、
その内径は上記大径部２４の外径とほぼ同一寸法
となつている。 The disappearing model 7 for a runner is composed of a large diameter part 24, a medium diameter part 25, and a small diameter part 26 which are formed separately, and these are connected to each other within the molding sand 3. Furthermore, the upstream end of the large diameter portion 24 and the weir basin 18
A circular pipe 30 made of ceramic is interposed between the sprue 18a and the sprue 18a. The inner hole of this circular pipe 30 is a runner 8',
Its inner diameter is approximately the same as the outer diameter of the large diameter portion 24.
（発明の効果）
この発明によれば、湯道用消失模型の内部にそ
の長手方向に沿つて通気孔を形成し、鋳型側にお
ける上記通気孔の端部が鋳物砂内に開放されるよ
うにしたため、上記湯道用消失模型の熱分解で発
生するガスのうち湯道の外周部のガスは直接鋳物
砂内に流入し、これと同時に、湯道の内部側のガ
スは、そのガス圧力により通気孔内を流動して鋳
物砂内に流入する。よつて、上記湯道用消失模型
の熱分解で発生するガスは鋳物砂内に円滑に吸収
されることから、上記ガスが湯道内に残留するこ
とが防止され、この結果、溶湯は湯道内を円滑に
流動する。(Effects of the Invention) According to the present invention, a ventilation hole is formed inside the vanishing model for a runner along its longitudinal direction, and the end of the ventilation hole on the mold side is opened into the foundry sand. Therefore, among the gases generated by the thermal decomposition of the above-mentioned vanishing model for runners, the gas in the outer periphery of the runner directly flows into the foundry sand, and at the same time, the gas inside the runner dies due to the gas pressure. It flows through the vent and flows into the foundry sand. Therefore, the gas generated by the thermal decomposition of the disappearing model for the runner is smoothly absorbed into the foundry sand, so the gas is prevented from remaining in the runner, and as a result, the molten metal flows through the runner. Flows smoothly.
図はこの発明の実施例を示し、第１図及び第２
図は第１実施例で、第１図は鋳造装置の概略全体
縦断面図、第２図は第１図の−線矢視拡大断
面図、第３図は第２実施例で第１図に相当する図
である。
１……鋳造装置、３……鋳物砂、５……鋳型用
消失模型、６……鋳型、７……湯道用消失模型、
８……湯道、１８ａ……湯口、２３……通気孔。
The figures show embodiments of the invention, and FIGS.
The figure shows the first embodiment, FIG. 1 is a schematic overall vertical cross-sectional view of the casting apparatus, FIG. 2 is an enlarged cross-sectional view taken along the - line in FIG. 1, and FIG. FIG. 1... Casting device, 3... Foundry sand, 5... Disappearance model for mold, 6... Mold, 7... Disappearance model for runner,
8... Runway, 18a... Sprue, 23... Ventilation hole.
Claims (1)
る湯道用消失模型を設けた鋳造装置において、上
記湯道用消失模型の内部にその長手方向に沿つて
通気孔を形成し、鋳型側における上記通気孔の端
部を鋳物砂内に開放したことを特徴とする鋳造装
置の湯道用消失模型。1. In a casting device equipped with a disappearing model for a runner connected to a mold formed in foundry sand from the sprue side, a ventilation hole is formed inside the disappearing model for a runner along its longitudinal direction, and A vanishing model for a runner of a casting device, characterized in that the end of the vent hole is opened into foundry sand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18706087A JPH0246295B2 (en) | 1987-07-27 | 1987-07-27 | CHUZOSOCHINOYUMICHOSHOSHITSUMOKEI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18706087A JPH0246295B2 (en) | 1987-07-27 | 1987-07-27 | CHUZOSOCHINOYUMICHOSHOSHITSUMOKEI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6431550A JPS6431550A (en) | 1989-02-01 |
| JPH0246295B2 true JPH0246295B2 (en) | 1990-10-15 |
Family
ID=16199459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18706087A Expired - Lifetime JPH0246295B2 (en) | 1987-07-27 | 1987-07-27 | CHUZOSOCHINOYUMICHOSHOSHITSUMOKEI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0246295B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5076977A (en) * | 1990-01-10 | 1991-12-31 | Eastman Kodak Company | Process for controlling curl in polyester film |
| US6886621B1 (en) * | 2002-08-29 | 2005-05-03 | Brunswick Corp. | Sprue for a lost foam casting system for biasing a directional fill rate from a bottom portion of a metal casting |
| CN102962409A (en) * | 2011-09-01 | 2013-03-13 | 陕西大山机械有限公司 | Vacuum lost foam burial type sandbox system apparatus |
| CN111644571A (en) * | 2019-11-09 | 2020-09-11 | 朱建月 | Low-cost machining equipment and casting method for casting of casting and casting |
-
1987
- 1987-07-27 JP JP18706087A patent/JPH0246295B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6431550A (en) | 1989-02-01 |
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