JP2636988B2 - Gas pressure mold - Google Patents
Gas pressure moldInfo
- Publication number
- JP2636988B2 JP2636988B2 JP3221394A JP22139491A JP2636988B2 JP 2636988 B2 JP2636988 B2 JP 2636988B2 JP 3221394 A JP3221394 A JP 3221394A JP 22139491 A JP22139491 A JP 22139491A JP 2636988 B2 JP2636988 B2 JP 2636988B2
- Authority
- JP
- Japan
- Prior art keywords
- pin
- hole
- resin
- piston
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1734—Nozzles therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶融樹脂を高圧で射出
成形する時に用いる樹脂成形用金型に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding die used for injection molding a molten resin at a high pressure.
【０００２】[0002]
【従来の技術】従来よりこの種の金型は種々開発されて
きているが、これらは、水で冷却するものばかりであっ
た。一般的にいって、工場用水は余り精製されていない
ので、このような水を利用して、ピンを冷却するのに使
用すると、水垢によって、短時間の間に、ピンの中空部
が充填されて、使用不能となるものであった。これをも
う少し、敷衍して図５によって説明すると、１は固定金
型、２は可動金型、３は固定金型１と可動金型２とによ
り形成された空洞に射出された樹脂、固定金型１と可動
金型とは矢印Ａ，Ｂの方向に相対的に開閉する。2. Description of the Related Art Conventionally, various types of molds of this type have been developed, but all of them have been cooled with water. Generally speaking, factory water is not very purified, so if such water is used to cool the pins, the scale will fill the hollows of the pins in a short time. And became unusable. This will be described in more detail with reference to FIG. 5. 1 is a fixed mold, 2 is a movable mold, 3 is a resin injected into a cavity formed by the fixed mold 1 and the movable mold 2, and a fixed mold. The mold 1 and the movable mold open and close relatively in the directions of arrows A and B.
【０００３】而して、３ａは径の大きなボス部Ａ、３ｂ
は径の小さなボス部Ｂであり、４はボス部Ａのピンで内
部に細長い孔４ａを形成しており、孔４ａには矢印Ｃで
示すように水が流れてピン４を冷却する。４ｂは水が孔
４ａを効果的に流れるようにした仕切り板である。可動
金型２には水管５，６があって上記孔４ａに水を供給す
る。この様に、径の大きなボス部Ａは内部に水管で冷却
することによりピン４の先端が加熱することを防いでい
る。しかしながら、径の小さなボス部Ｂのピン７は、径
が小さいので内部に冷却用の水管を設けることができな
いので、ピン７の先端が加熱することがある。[0003] 3a is a large diameter boss A, 3b
Is a boss portion B having a small diameter, and 4 is a pin of the boss portion A and has an elongated hole 4a formed therein. Water flows through the hole 4a as shown by an arrow C to cool the pin 4. Reference numeral 4b denotes a partition plate that allows water to effectively flow through the holes 4a. The movable mold 2 has water tubes 5 and 6 for supplying water to the holes 4a. As described above, the boss portion A having a large diameter prevents the tip of the pin 4 from being heated by cooling the inside with the water pipe. However, since the pin 7 of the boss B having a small diameter has a small diameter, a cooling water pipe cannot be provided inside the pin 7 and the tip of the pin 7 may be heated.
【０００４】時として、無理にこの様な径の小さなピン
７に孔をあけて水を通すこともあるが、工業的に利用で
きる冷却水はいわゆる水垢を発生させるので、孔が短時
日で塞がれてしまうという問題があった。In some cases, water is forcibly made by drilling holes in such small-diameter pins 7, but the cooling water that can be used industrially generates so-called scale, so that the holes are closed in a short time. There was a problem that would be.
【０００５】[0005]
【発明が解決しようとする課題】以上の様に、冷却水に
よる冷却方法には限界があり、本発明はこれを改良しよ
うとして開発したものである。図６は時間経過とともに
金型各部の温度変化を示したもので、横軸は時間、縦軸
は温度を示している。図６でＴm は射出時の樹脂温度で
あり、Ｔ4 、Ｔ7 はピン４、ピン７の温度変化を示し、
Ｔp は樹脂の温度変化を示している。時刻ｔ1 で温度Ｔ
m の樹脂が射出されたとする（点Ｐ1 ）。樹脂は冷却さ
れてｔc 時間後に点Ｐ2 まで温度降下する。その後、時
間ｔt の間に型の開閉、製品の取り出しが行われ、時刻
ｔ2 で次の射出が行われる。この間に、ピン４の温度は
Ｔ4 で示すようにＳ1 からスタートしてＳ2 まで上昇す
る。一方、ピン７はＳ1 からスタートしてＳ3 まで上昇
する。ピン４の温度上昇がピン７の温度上昇より小さい
のはピン４が冷却されているからである。つぎの射出で
は、樹脂温度はＰ3 からスタートしてＰ4 まで降下する
が、その間にピン４はＳ2 からスタートしてＳ5 に上昇
する。このようにして、射出を続けた結果、ピン４は冷
却されているので比較的低い温度で平衡状態に達する
が、ピン７は冷却がないので平衡温度は高くなる。その
ためピン７の近傍における樹脂の冷却は遅くなり、成形
のサイクル時間が延長されると言う問題点があった。ま
た、樹脂のボス部３ａ、３ｂは平坦部３ｃに較べて樹脂
量が多いので、樹脂が固化するのが平坦部より遅れる。
そのためボス部にはヒケ８ａと称する凹部ができること
がある。これは本来平坦であるべき表面外観を悪くする
と言う問題があった。As described above, there is a limit to the cooling method using cooling water, and the present invention has been developed to improve this. FIG. 6 shows the temperature change of each part of the mold with the passage of time. The horizontal axis represents time, and the vertical axis represents temperature. T m in FIG. 6 is a resin temperature during the injection, T 4, T 7 is pin 4 shows the temperature change of the pin 7,
T p indicates a temperature change of the resin. Temperature T at time t 1
It is assumed that the resin of m is injected (point P 1 ). Resin temperature drops to the point P 2 after being cooled t c time. Then, mold opening and closing of during the time t t, extraction of the product is performed, the next injection is performed at time t 2. During this time, the temperature of the pin 4 starting from S 1 as indicated by T 4 rises to S 2. On the other hand, the pin 7 is increased to S 3 starting from S 1. The temperature rise of the pin 4 is smaller than the temperature rise of the pin 7 because the pin 4 is cooled. In the next injection, the resin temperature is lowered to a P 4 starting from P 3, the pin 4 during rises S 5 starting from S 2. Thus, as a result of continuing the injection, the pin 4 reaches an equilibrium state at a relatively low temperature because it is cooled, but the equilibrium temperature becomes high because the pin 7 has no cooling. Therefore, there is a problem that the cooling of the resin in the vicinity of the pin 7 is delayed, and the cycle time of molding is extended. In addition, since the resin boss portions 3a and 3b have a larger amount of resin than the flat portion 3c, the resin hardens later than the flat portion.
Therefore, a concave portion called sink mark 8a may be formed in the boss portion. This has the problem of deteriorating the surface appearance that should be flat.
【０００６】更に、また、一般に樹脂は固化時に体積を
減ずる。その為ボス部ではピン４、ピン７に樹脂が密着
するが、その分ボス部の外側では空隙８ｂができること
がある。このような空隙部は熱の伝達が悪いので樹脂の
冷却が遅れ、したがって冷却時間をますます長くなると
いう問題があった。[0006] Further, generally, the volume of the resin is reduced upon solidification. Therefore, the resin adheres to the pins 4 and 7 at the boss portion, but a gap 8b may be formed outside the boss portion. Such a gap has a problem in that the cooling of the resin is delayed due to poor heat transfer, and thus the cooling time is further increased.
【０００７】本発明は上記のような事項に鑑み開発した
もので、即ち、液体を使用せずに、気体を使用して、従
来できなかった事項を解決したものである。The present invention has been developed in view of the above-mentioned problems, that is, it has solved the problems which could not be achieved by using gas instead of using liquid.
【０００８】[0008]
【課題を解決するための手段】次に、本発明について説
明する。溶融合成樹脂を高圧で射出成形する金型のピン
に於て、該ピン内を中空の通路孔に形成し、且つ、ピン
の成形樹脂に接する面に貫通小孔を設け、前記通路孔部
内に高圧の気体を送入し得る構成となし、更に、この通
路孔部内を移動し得るピンを設け、該ピンの先端が前記
貫通小孔を開閉できる構成としたものである。Next, the present invention will be described. In a pin of a mold for injection molding a molten synthetic resin at high pressure, the inside of the pin is formed as a hollow passage hole, and a small through hole is provided on a surface of the pin that contacts the molding resin, and the inside of the passage hole is The structure is such that a high-pressure gas can be supplied, and a pin that can move in the passage hole is provided, and the tip of the pin can open and close the through-hole.
【０００９】[0009]
【作用】本発明は上記したように、ピンの先端に設けた
貫通小孔をピストンピンで開閉する構成にしているもの
で、溶融合成樹脂の高圧力が上記貫通小孔に加わっても
溶融合成樹脂が上記貫通小孔に侵入することがなく、必
要なときには上記ピストンピンを駆動して上記貫通小孔
を開き空気を噴出させることができる。According to the present invention, as described above, the small through hole provided at the tip of the pin is configured to be opened and closed by the piston pin. Even if the high pressure of the molten synthetic resin is applied to the small through hole, the molten synthetic resin is formed. The resin does not enter the small through-hole, and the piston pin can be driven to open the small through-hole to eject air when necessary.
【００１０】[0010]
【実施例】次に、本発明の一実施例を図面に基づいて説
明する。先ず、図１に示す本発明の構成について具体的
に説明すると、径の小さいボス部13ｂに対するピン17を
設け、これに細長い中空の通路孔17ａを設け、さらにそ
の通路孔17ａ内に細長いピストンピン19を設けている。
ピストンピン19は一端をピストン10に連結されていて、
他の一端は図２の拡大図に示すように先端が円錐形に成
形されている。Next, an embodiment of the present invention will be described with reference to the drawings. First, the configuration of the present invention shown in FIG. 1 will be specifically described. A pin 17 for a small diameter boss portion 13b is provided, an elongated hollow passage hole 17a is provided therein, and an elongated piston pin is further provided in the passage hole 17a. 19 are provided.
One end of the piston pin 19 is connected to the piston 10,
The other end has a conical tip as shown in the enlarged view of FIG.
【００１１】また、前記図２に示すように、ピン17の先
端部には貫通小孔17ｃが穿設されており、ピストンピン
19が矢印Ｄ方向に動くと、ピストンピン19の円錐部で貫
通小孔17ｃを閉じる。逆にピストンピン19が矢印Ｅ方向
に動くと、貫通小孔17ｃは開口する。一方、図１に示す
ように、ピストンピン10はシリンダー部17ｄに滑合して
おり、シリンダー部には通気孔17ｅ、17ｆが設けられ、
それぞれ外部の高圧気体源につながっている。As shown in FIG. 2, a through hole 17c is formed at the tip of the pin 17 so that the piston pin
When 19 moves in the direction of arrow D, the conical portion of the piston pin 19 closes the through hole 17c. Conversely, when the piston pin 19 moves in the direction of the arrow E, the small through hole 17c opens. On the other hand, as shown in FIG. 1, the piston pin 10 is in sliding contact with the cylinder portion 17d, and the cylinder portion is provided with ventilation holes 17e and 17f.
Each is connected to an external source of high pressure gas.
【００１２】通気孔17ｆに高圧気体を供給すると、ピス
トン10は矢印Ｄ方向に動き、図２に示すようにピストン
ピン19の先端は貫通小孔17ｃを閉じる。逆に通気孔17ｅ
に高圧気体を供給すると、ピストン10は矢印Ｅ方向に動
き、図２にしめすようにピストンピン19の先端は貫通小
孔17ｃを開く。When high-pressure gas is supplied to the vent hole 17f, the piston 10 moves in the direction of arrow D, and the tip of the piston pin 19 closes the small through hole 17c as shown in FIG. Conversely, vent hole 17e
When the high-pressure gas is supplied to the piston 10, the piston 10 moves in the direction of arrow E, and the tip of the piston pin 19 opens a small through hole 17c as shown in FIG.
【００１３】樹脂成形に際しては、先ず固定金型11と可
動金型12を閉じ、形成された空洞内に樹脂13を射出す
る。この時、図１におけるピストン10には通気孔17ｆに
高圧気体が供給されているので、ピン17の先端の貫通小
孔17ｃはピストンピン19の円錐部で閉じられている。樹
脂は高圧で射出されるので、樹脂の圧力によりピストン
ピン10は矢印Ｅ方向に押戻し、中空の通路孔17ａの内部
に侵入しようとする。しかし、本発明においてはピスト
ン10の受圧面積と高圧気体の圧力の積が上記の押戻し力
より大きくなるようにピストン10の受圧面積を設計して
おく。すなわち、貫通小孔17ｆの面積をａ1 ，貫通小孔
17ｆに加わる溶融樹脂の圧力をｐ1 とし、ピストン10の
受圧面積をａ2 、ピストン10に加わる空気圧をｐ2 とし
たとき、 ａ1 ×ｐ1 ＜ａ2 ×ｐ2 となるようにピストン10の寸法を決める。したがってピ
ストンピン19が矢印Ｅ方向に押戻されることはない。At the time of resin molding, first, the fixed mold 11 and the movable mold 12 are closed, and the resin 13 is injected into the formed cavity. At this time, since the high-pressure gas is supplied to the ventilation hole 17 f of the piston 10 in FIG. 1, the small through hole 17 c at the tip of the pin 17 is closed by the conical portion of the piston pin 19. Since the resin is injected at a high pressure, the piston pin 10 is pushed back in the direction of arrow E by the pressure of the resin and attempts to enter the hollow passage hole 17a. However, in the present invention, the pressure receiving area of the piston 10 is designed so that the product of the pressure receiving area of the piston 10 and the pressure of the high-pressure gas is larger than the above-described push-back force. That is, the area of the small through hole 17f is a 1 ,
The pressure of the molten resin applied to 17f and p 1, a pressure receiving area a 2 of the piston 10, when the air pressure applied to the piston 10 and the p 2, the piston 10 so that a 1 × p 1 <a 2 × p 2 Determine the dimensions of Therefore, the piston pin 19 is not pushed back in the direction of the arrow E.
【００１４】所定の冷却時間が経過すると、可動金型12
を矢印Ｆ方向に動かして製品13を取り出すが、それと同
時に、図１の通気孔17ｅに高圧気体を供給する。これに
より上記したようにピストン10は矢印Ｅ方向に動き、ピ
ストンピン19は図２（ｂ）に示すように矢印Ｅ方向に後
退して貫通小孔17ｃを開口する。これにより高圧気体
は、中空の通路孔17ａを通って貫通小孔17ｃより噴出す
る。気体が貫通小孔17ｃより噴出することによりピン17
は気体により冷却される。そのため、ピン17の平衡温度
は図６に示した従来例の場合より低くなる。したがっ
て、ピン17近傍の樹脂の冷却速度も速くなるので成形サ
イクル時間を減少することができる。When a predetermined cooling time has elapsed, the movable mold 12
Is moved in the direction of arrow F to take out the product 13. At the same time, high-pressure gas is supplied to the vent 17e of FIG. As a result, the piston 10 moves in the direction of the arrow E as described above, and the piston pin 19 retreats in the direction of the arrow E as shown in FIG. Accordingly, the high-pressure gas is ejected from the small through-hole 17c through the hollow passage hole 17a. When the gas is blown out from the small through-hole 17c, the pin 17 is released.
Is cooled by the gas. Therefore, the equilibrium temperature of the pin 17 becomes lower than that of the conventional example shown in FIG. Accordingly, the cooling rate of the resin in the vicinity of the pin 17 is increased, so that the molding cycle time can be reduced.
【００１５】また樹脂の冷却の終り付近で、金型を開く
前に、高圧気体を孔17ｅに供給することにより、図３に
示すように、貫通小孔17ｃから気体が噴出して、可動金
型12と樹脂13との間に空隙をつくり、樹脂13と固定金型
11との空隙はなくなる。従って、上記したように樹脂13
と固定金型11との空隙を無くすると、それだけ樹脂の冷
却速度は早くなり、成形サイクル減少に役立つ。In the vicinity of the end of cooling of the resin, before the mold is opened, a high-pressure gas is supplied to the hole 17e. As a result, as shown in FIG. A gap is created between the mold 12 and the resin 13, and the resin 13 and the fixed mold
The gap with 11 disappears. Therefore, as described above, the resin 13
Eliminating the gap between the resin and the fixed mold 11 increases the cooling rate of the resin, which helps to reduce the molding cycle.
【００１６】更に、樹脂の冷却の終り近くで、金型表面
に接する樹脂は固化していても、樹脂内部はまだ溶融状
態にあるときに、高圧気体を通気孔17ｅに供給すること
により図４に示すように、貫通孔17ｃから気体が噴出し
て樹脂の内部に気体による空洞18を作ることができる。
この空洞18の内部の気体は高圧であるから樹脂内部から
樹脂を外側の金型に押し付けるので、図５に示したボス
部で発生するヒケの発生を防ぐことも出来る。Further, near the end of cooling of the resin, when the resin in contact with the mold surface is solidified, but the inside of the resin is still in a molten state, high-pressure gas is supplied to the vent hole 17e so as to obtain the structure shown in FIG. As shown in (1), a gas is blown out from the through hole 17c to form a cavity 18 of the gas inside the resin.
Since the gas inside the cavity 18 is at a high pressure, the resin is pressed from the inside of the resin to the outer mold, so that the sink generated at the boss portion shown in FIG. 5 can also be prevented.
【００１７】上記の気体とは一般的には空気が好ましい
ものであるが、その他の気体も利用するする場合があ
る。また、液体も水だけを指すものではない。In general, the above gas is preferably air, but other gases may be used in some cases. In addition, liquid does not mean only water.
【００１８】[0018]
【発明の効果】上記した様に、本発明によれば、ピンの
内部に気体の通路即ち中空の通路孔部を形成し、樹脂の
射出時には上記空気の通路孔に設けたピストンピンを前
進させてピストンピン先端の貫通小孔を塞いで樹脂の侵
入を防ぎ、必要なときにはピストンピンを後退させて、
ピン先端の貫通小孔から高圧気体を噴出せしめることに
より、ピンの冷却速度を早くして成形サイクル時間の減
少に効果があり、又、樹脂を固定金型に押し付けること
により、樹脂の冷却速度を早くすることができ、更に、
樹脂が完全固化する前に気体を噴出させることにより、
樹脂内部に気体の空洞を形成してヒケの発生を防ぐこと
ができ、且つまた、液体を利用するよりも制作は容易で
ある等の作用効果を有するものである。As described above, according to the present invention, a gas passage, that is, a hollow passage hole is formed inside the pin, and when the resin is injected, the piston pin provided in the air passage hole is advanced. To prevent the resin from entering by closing the through hole at the tip of the piston pin, and retract the piston pin when necessary,
By injecting high-pressure gas from the through-hole at the tip of the pin, the cooling speed of the pin is increased and the molding cycle time is reduced, and the cooling speed of the resin is reduced by pressing the resin against the fixed mold. Can be faster, and
By blowing gas before the resin is completely solidified,
Gas cavities can be formed inside the resin to prevent the occurrence of sink marks, and it also has effects such as easier production than using a liquid.
【図１】図１は本発明の一実施例の要部を示す断面図。FIG. 1 is a sectional view showing a main part of one embodiment of the present invention.
【図２】図２(a)(b)は同じく高圧気体によるピストンピ
ンの動きを示す説明的断面図。FIGS. 2A and 2B are explanatory cross-sectional views showing the movement of a piston pin caused by high-pressure gas.
【図３】図３は同じく本発明の一使用状態をしめす断面
図。FIG. 3 is a sectional view showing a use state of the present invention.
【図４】図４は同じく本発明の他の使用状態を示す断面
図。FIG. 4 is a sectional view showing another use state of the present invention.
【図５】図５は従来の製品の断面図。FIG. 5 is a sectional view of a conventional product.
【図６】図６は樹脂成形時の時間経過と金型各部の温度
変化を示す表であるFIG. 6 is a table showing a lapse of time during resin molding and a temperature change of each part of a mold.
11・・・固定金型 12・・・化動金型 13・・・樹脂 17・・・ピン 17ａ・・中空の通路孔 17ｃ・・貫通小孔 17ｄ・・シリンダー 17ｅ・・気体孔 19・・・ピストンピン 10・・・ピストン 11: Fixed mold 12: Chemical mold 13: Resin 17: Pin 17a: Hollow passage hole 17c: Small through hole 17d: Cylinder 17e: Gas hole 19:・ Piston pin 10 ・ ・ ・ Piston
Claims (2)
ピン内を中空の通路孔に形成し、このピンの先端部に貫
通小孔を設け、上記通路内には気体により動作するピス
トンに取付けて、上記貫通小孔を開閉するピストンピン
を設け、上記通路孔および貫通小孔に上記ピストンピン
を移動させる気体の一部が流入する気体圧送金型。1. A mold for injection molding a molten synthetic resin at a high pressure.
The inside of the pin is formed as a hollow passage hole and penetrated through the tip of this pin.
A through hole is provided, and a gas-operated piston is
Piston pin that is attached to a ton to open and close the small through hole
The piston pin is provided in the passage hole and the small through hole.
The gas pressure transfer die into which a part of the moving gas flows .
脂の圧力との積より、ピストンの面積とピストンに加わ
る空気圧との積を大きくした請求項１記載の気体圧送金
型。2. The gas pressure die according to claim 1 , wherein the product of the area of the piston and the air pressure applied to the piston is larger than the product of the area of the through hole and the pressure of the molten resin applied to the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3221394A JP2636988B2 (en) | 1991-09-02 | 1991-09-02 | Gas pressure mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3221394A JP2636988B2 (en) | 1991-09-02 | 1991-09-02 | Gas pressure mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0557754A JPH0557754A (en) | 1993-03-09 |
| JP2636988B2 true JP2636988B2 (en) | 1997-08-06 |
Family
ID=16766079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3221394A Expired - Lifetime JP2636988B2 (en) | 1991-09-02 | 1991-09-02 | Gas pressure mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2636988B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6291519B1 (en) | 1998-10-14 | 2001-09-18 | Novartis Ag | Method of preventing damage to eye tissue |
| CN108081539A (en) * | 2016-11-21 | 2018-05-29 | 柳道万和(苏州)热流道系统有限公司 | For the gas-assisted molding device of mold |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1213706A (en) * | 1984-02-17 | 1986-11-12 | Gellert, Jobst Ulrich | Injection molding valve gated system |
| US4530654A (en) * | 1984-05-29 | 1985-07-23 | Mold-Masters Limited | Injection molding peripheral opening core ring gate |
| JPS61100420A (en) * | 1984-10-24 | 1986-05-19 | Matsushita Electric Ind Co Ltd | Manufacture of plastic lens |
| JPH0195007A (en) * | 1987-10-08 | 1989-04-13 | Honda Motor Co Ltd | Molding method for boss section of resin molded product |
-
1991
- 1991-09-02 JP JP3221394A patent/JP2636988B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0557754A (en) | 1993-03-09 |
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