JPH0562016B2 - - Google Patents
Info
- Publication number
- JPH0562016B2 JPH0562016B2 JP18668087A JP18668087A JPH0562016B2 JP H0562016 B2 JPH0562016 B2 JP H0562016B2 JP 18668087 A JP18668087 A JP 18668087A JP 18668087 A JP18668087 A JP 18668087A JP H0562016 B2 JPH0562016 B2 JP H0562016B2
- Authority
- JP
- Japan
- Prior art keywords
- release agent
- mold
- nozzle
- mold release
- air
- 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
- 239000006082 mold release agent Substances 0.000 claims description 46
- 239000000498 cooling water Substances 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 239000003570 air Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Landscapes
- Casting Devices For Molds (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ダイカスト鋳造用金型や、合成樹脂
成形用金型に離型剤を自動的に塗布する装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for automatically applying a mold release agent to a die casting mold or a synthetic resin mold.
金型を用いて鋳物や合成樹脂を成形する際に、
型開きした金型からの製品取出しを容易にし、生
産効率を良くするため、金型に離型剤を塗布する
ことは従来行われている。
When molding castings or synthetic resins using molds,
In order to facilitate the removal of a product from an opened mold and improve production efficiency, it has been conventional practice to apply a mold release agent to the mold.
特開昭60−136764号公報には、型開きされた固
定金型と可動金型との間に離型剤を吹き付けるス
プレーヘツドを進退自在に設け、金型の所望面に
離型剤を塗布するものが提案されている。 JP-A-60-136764 discloses a method in which a spray head for spraying a mold release agent between an opened fixed mold and a movable mold is provided so as to move forward and backward, and the mold release agent is applied to a desired surface of the mold. It is suggested that something be done.
生産ラインの中では生産性向上のため迅速に離
型剤を塗布する必要があり、金型が昇温した場合
にも金型を冷却する時間を取らずに離型剤を塗布
する場合が多い。ところが、離型剤はその性質
上、所定温度以上の高温で使用した場合には離型
効果が低下する。
In production lines, it is necessary to quickly apply a mold release agent to improve productivity, and even when the temperature of the mold increases, the mold release agent is often applied without taking time to cool the mold. . However, due to the nature of the mold release agent, when it is used at a high temperature above a predetermined temperature, the mold release effect decreases.
特に、ダイカスト鋳造の場合には、金型を開い
て製品を取り出した直後に、金型を冷却する目的
を兼ねて離型剤を吹き付けることが多い。この場
合には、金型温度は400℃位もある。このように
金型温度が高いと離型剤の離型効果が低下するの
で、これを補うため高濃度の離型剤を使用するこ
とになる。 In particular, in the case of die casting, a mold release agent is often sprayed to cool the mold immediately after opening the mold and taking out the product. In this case, the mold temperature is about 400°C. When the mold temperature is high as described above, the mold release effect of the mold release agent is reduced, so in order to compensate for this, a high concentration mold release agent is used.
高温の金型に高濃度の離型剤を吹付けると、離
型剤が金型に触れた瞬間に蒸発し、離型剤の成分
が金型やその付近に付着し、却つて焼付きが激し
くなり、製品の抜けを悪くし、製品にもカジリを
生ずる原因となつている。 When a highly concentrated mold release agent is sprayed onto a hot mold, the mold release agent evaporates the moment it touches the mold, and the components of the mold release agent adhere to the mold and its surroundings, causing seizure. This becomes more intense, making it harder for the product to come out, and causing the product to gall.
本発明は、上記の問題点を解決し、金型を迅速
に冷却し、少量、低濃度の離型剤の使用で製品の
焼付きが少ない離型剤自動塗布装置を提供するこ
とを目的とするものである。 The purpose of the present invention is to solve the above-mentioned problems and provide an automatic mold release agent applicator that quickly cools a mold and reduces product seizure by using a small amount and low concentration of mold release agent. It is something to do.
本発明は、ノズル本体に噴出口を有するノズル
ヘツドと該噴出口に冷却水とエアーを導入する透
孔を有する中心軸体とを固定し、該中心軸体に一
端に流出口を有するスライド部材を摺動可能に嵌
合し、ノズル本体の離型剤収納室と前記ノズルヘ
ツドの噴出口との間を前記スライド部材で開閉す
るようにしたノズルユニツトを備えた離型剤自動
塗布装置であつて、ノズル本体の離型剤収納室と
ノズルヘツドの噴出口との間をスライド部材で閉
じた状態では、エアー又は冷却水とエアーの混合
物が中心軸体の透孔を通つてノズルヘツドの噴出
口から吹出し、スライド部材を移動してノズル本
体の離型剤収納室とノズルヘツドの噴出口との間
を開いてエアーを導入すると、離型剤がエアーで
送り出され、噴出口から霧状に吹き出される。
The present invention fixes a nozzle head having an ejection port to a nozzle body and a central shaft body having a through hole for introducing cooling water and air into the nozzle body, and attaches a slide member having an outlet at one end to the central shaft body. An automatic mold release agent applicator comprising a nozzle unit that is slidably fitted and configured to open and close between the mold release agent storage chamber of the nozzle body and the spout of the nozzle head with the slide member, When the space between the mold release agent storage chamber of the nozzle body and the nozzle head nozzle is closed by the slide member, air or a mixture of cooling water and air is blown out from the nozzle head nozzle through the through hole of the central shaft body. When the slide member is moved to open the space between the mold release agent storage chamber of the nozzle body and the jet nozzle of the nozzle head and air is introduced, the mold release agent is sent out with air and is blown out in the form of mist from the jet nozzle.
したがつて、このノズルユニツトを用いること
により、金型の冷却、水切り、離型剤の塗布及び
離型剤の水滴切りを自動的に順次行うことができ
る。 Therefore, by using this nozzle unit, it is possible to automatically and sequentially perform cooling of the mold, draining water, applying a mold release agent, and removing water drops from the mold release agent.
図面に示す本発明の一実施例について説明す
る。
An embodiment of the present invention shown in the drawings will be described.
塗布装置は、第２図に示すように固定金型１、
可動金型２を型開きして製品を取り出した後に、
多数のノズルユニツトにノズルヘツドの噴出口を
１つに纏めた口金を取付けた塗布ユニツト３０を
両金型間に移動させ、両金型１，２のキヤビテイ
１′，２′や中子に冷却水、エアー、離型剤を噴霧
状に順次吹付けるようにして使用される。 As shown in FIG. 2, the coating device includes a fixed mold 1,
After opening the movable mold 2 and taking out the product,
The coating unit 30, which has a large number of nozzle units with a mouthpiece that combines the nozzle heads into one, is moved between both molds, and cooled water is applied to the cavities 1', 2' and cores of both molds 1, 2. , air, and a mold release agent are sprayed in sequence.
ノズルユニツト１０は、第１図に断面で示すよ
うに、ノズル本体３に先端に噴出口４0を有する
ノズルヘツド４が着脱自在に螺合され、ノズル本
体３内には先端に流出口８0とこれに連通する透
孔８1を有する中心軸体８が配設され、中心軸体
８はそのフランジ部８2でスナツプリング１１に
よりノズル本体３に固定されている。 In the nozzle unit 10, as shown in cross section in FIG. 1, a nozzle head 4 having a spout 40 at the tip is removably screwed into a nozzle body 3, and the nozzle body 3 has an outlet 80 at the tip. A central shaft body 8 having a through hole 8 1 communicating therewith is disposed, and the central shaft body 8 is fixed to the nozzle body 3 at its flange portion 8 2 by a snap spring 11 .
中心軸体８の周りにスライド部材６がその中心
穴６2で嵌合し、シール部材を介して摺動自在に
配置され、スライド部材６の先端部には、吹出し
口６0が設けられ、その周囲にはウレタンゴムか
らなるチツプ６1が配設されていて、ノズルヘツ
ド４の噴出口４0への流入口４1を開閉するように
なつている。スライド部材６のピストン部６3に
は中心軸体８のフランジ部８2との間にバネ７が
配設され、ノズル本体３の隔壁との間には受けゴ
ム１２が設けてあつて、スライド部材６はバネ７
で受けゴム１２に押し付けけられるとともに、先
端のチツプ６1がノズルヘツド４の流入口４1を閉
じるようになつている。 A slide member 6 is fitted around the center shaft body 8 through its center hole 6 2 and is slidably arranged via a seal member, and a blowout port 6 0 is provided at the tip of the slide member 6. A tip 61 made of urethane rubber is disposed around it, and is adapted to open and close the inflow port 41 to the spout 40 of the nozzle head 4. A spring 7 is provided between the piston portion 6 3 of the slide member 6 and the flange portion 8 2 of the central shaft body 8, and a receiving rubber 12 is provided between the piston portion 6 3 of the slide member 6 and the flange portion 8 2 of the nozzle body 3. Member 6 is spring 7
At the same time, the tip 61 at the tip closes the inlet 41 of the nozzle head 4.
第１図に示すように、ノズルユニツト１０に
は、ノズル本体３、ノズルヘツド４、スライド部
材６及び中心軸体８により、室Ａ，Ｂ，Ｃが形成
されていて、室Ａには離型剤の配管、室Ｂ，Ｃに
はエアーの配管がそれぞれプラグ２６，１６，１
７で接続されている。 As shown in FIG. 1, the nozzle unit 10 has chambers A, B, and C formed by a nozzle body 3, a nozzle head 4, a slide member 6, and a central shaft body 8, and chamber A contains a mold release agent. Air piping is connected to chambers B and C with plugs 26, 16, and 1, respectively.
7 is connected.
室Ａには、離型剤を入れたタンク２０からフイ
ルタ２１、ポンプ２２、逆流防止弁２３、流量調
節弁２４及び制御弁２５を介して離型剤供給系が
接続される。 A release agent supply system is connected to chamber A from a tank 20 containing the release agent via a filter 21 , a pump 22 , a check valve 23 , a flow rate adjustment valve 24 , and a control valve 25 .
中心軸体８の後端には、エアー及び冷却水を導
入する配管が分配弁１３を介して接続される。 Piping for introducing air and cooling water is connected to the rear end of the central shaft body 8 via a distribution valve 13 .
分配弁１３には、水タンク２７、ポンプ２８、
制御弁２９、逆流防止弁３１、からなる冷却水供
給系と、エアタンク３２、制御弁３３、逆流防止
弁３４からなるエアー供給系がミキシングヘツド
１５及び流量調節弁１４を介して接続され、分配
弁１３には、このノズルユニツト１０にエアー及
び冷却水を供給するだけでなく他のノズルユニツ
トに並列的にエアー及び冷却水を供給するための
配管１８及び１９が設けられている。 The distribution valve 13 includes a water tank 27, a pump 28,
A cooling water supply system consisting of a control valve 29, a check valve 31, and an air supply system consisting of an air tank 32, a control valve 33, and a check valve 34 are connected via a mixing head 15 and a flow control valve 14, and a distribution valve 13 is provided with piping 18 and 19 for not only supplying air and cooling water to this nozzle unit 10 but also for supplying air and cooling water to other nozzle units in parallel.
９はノズルユニツト１０の取付金具、３５はエ
アーのクイツクエキゾーストである。 9 is a mounting bracket for the nozzle unit 10, and 35 is an air quick exhaust.
この装置は次の機能を有する。 This device has the following features:
イ 霧吹きのように冷却水を吹付け、金型を冷却
して離型剤の最も付着し易い温度とする。B. Spray cooling water like a sprayer to cool the mold to a temperature where the mold release agent will most easily adhere to it.
ロ エアーで金型の水を切る。Drain water from the mold with air.
ハ 離型剤を必要な量だけ噴霧して金型キヤビテ
イや中子に塗布する。C. Spray the required amount of mold release agent and apply it to the mold cavity and core.
ニ エアーで離型剤の水滴を取る。Remove water droplets from the mold release agent using air.
前記の機能を奏するため、具体的には次のよう
な工程で作動を行わせる。 In order to perform the above function, specifically, the following steps are performed.
予備動作として、金型及び中子を開き、製品を
取り出した後、塗布ユニツト３０を金型間に入れ
る。 As a preliminary operation, after opening the mold and core and taking out the product, the coating unit 30 is placed between the molds.
冷却水吹付け
第１図の状態で室Ｃにエアーを導入し室Ｂを
開放すると、スライド部材６が前進し、吹出し
口６0の周りのチツプ６1がノズルヘツド４の離
型剤流入口４1を確実に塞ぎ室Ａを遮断するの
で、この状態では離型剤は出ない。 Cooling Water Spraying When air is introduced into chamber C and chamber B is opened in the state shown in FIG. 1 is reliably closed and chamber A is shut off, so no mold release agent comes out in this state.
冷却水用の制御弁２９を強に、エアー用の制
御弁３３を弱にコントロールし、ミキシングヘ
ツド１５で水とエアーを混合し、調節弁１４、
分配弁１３、中心軸体８の透孔８1、スライド
部材６の中心穴６2、吹出し口６0を通つてノズ
ルヘツド４の噴出口４0からエアーによつて冷
却水を吹付ける。 The control valve 29 for cooling water is controlled to be strong, the control valve 33 for air is controlled to be weak, water and air are mixed in the mixing head 15, and the control valve 14,
Cooling water is blown by air from the outlet 40 of the nozzle head 4 through the distribution valve 13, the through hole 81 of the central shaft body 8, the center hole 62 of the slide member 6 , and the outlet 60.
エアー吹付け
所定時間後に冷却水の制御弁２９を閉じ、エ
アーの制御弁３３を弱から強とする。 Air Blowing After a predetermined time, the cooling water control valve 29 is closed, and the air control valve 33 is changed from weak to strong.
この状態では、離型剤と冷却水は出ずにエア
ーだけが強く吹付けられるので、金型キヤビテ
イの水を切る。 In this state, the mold release agent and cooling water do not come out, and only air is blown strongly, so the water in the mold cavity is drained.
離型剤噴霧
金型の水切り後に、冷却水の制御弁２９を閉
じたままで室Ｂにエアーを導入し、室Ｃのエア
ーを開放すると、スライド部材６がバネ７に抗
して後退し、離型剤流入口４1が開く。 Mold Release Agent Spraying After draining the mold, when air is introduced into chamber B with the cooling water control valve 29 closed and air is released from chamber C, the slide member 6 moves back against the spring 7 and separates. The molding agent inlet 41 opens.
タンク２０から室Ａに供給された離型剤は、
吹出し口６0から強く吹付けられているエアー
で運ばれ、流入口４1の周りを通りノズルヘツ
ドの噴出口４0から霧状に噴出する。離型剤の
噴出量は制御弁２５でコントロールする。 The mold release agent supplied from the tank 20 to the chamber A is
The air is blown strongly from the outlet 60 , passes around the inlet 41 , and is ejected in the form of a mist from the outlet 40 of the nozzle head. The amount of release agent ejected is controlled by a control valve 25.
エアー吹付け
離型剤の塗布が完了した時点で、室Ｃにエア
ー導入し室Ｂを開放する。 Air Blowing When the application of the mold release agent is completed, air is introduced into chamber C and chamber B is opened.
スライド部材６が前進して離型剤流入口４1
の周りをチツプ６1が閉じるので、室Ａからの
離型剤の流出が止まり、エアーだけが強く吹付
けられる。 The slide member 6 moves forward and the release agent inlet 4 1
Since the tip 61 closes around the chamber A, the release agent stops flowing out from the chamber A, and only air is strongly blown.
作動終了
塗布した離型剤の水滴が消えた時点でエアー
用制御弁３３を閉じる。これによりエアーが停
止し、離型剤、水、エアーの全ての供給が止ま
つた状態に戻る。 End of operation: Close the air control valve 33 when the water droplets of the applied mold release agent disappear. As a result, the air supply is stopped, and the state returns to the state where the supply of the mold release agent, water, and air is all stopped.
次に、中子及び金型を閉じる。 Next, the core and mold are closed.
ないし工程の時間管理及び離型剤、冷却
水、エアーの各制御弁２５，２９，３３のコン
トロールはコンピユーターで管理する。 The time management of the process and the control of control valves 25, 29, and 33 for the mold release agent, cooling water, and air are managed by a computer.
以上のように、この装置は金型の冷却を空気混
合水で行い、次に冷却水を停止してエアーを強く
吹付け、ついで離型剤をエアーで強く吹付け、最
後に離型剤を停止してエアーだけを吹付ける作動
を、順次制御弁のコントロールで行うことができ
るので、離型剤の塗布を金型の最適温度で短時間
で行うことができる。また、離型剤の濃度を従来
の半分程度とすることができる。 As mentioned above, this device cools the mold with air-mixed water, then stops the cooling water and blows air strongly, then blows the mold release agent strongly with air, and finally sprays the mold release agent. Since the operation of stopping and blowing only air can be performed sequentially by controlling the control valve, the mold release agent can be applied in a short time at the optimum temperature of the mold. Furthermore, the concentration of the mold release agent can be reduced to about half of the conventional concentration.
第３図にノズルユニツト１０の別の使用状態を
示す。ノズル本体３を取付け金具９で金型１，２
の周囲に噴出口が金型キヤビテイに向くように固
定する。１０′のように固定金型１の内部にノズ
ルユニツトを配置し、可動金型２や中子に吹付け
るようにすることもできる。 FIG. 3 shows another usage state of the nozzle unit 10. Attach the nozzle body 3 to the molds 1 and 2 using the fitting 9.
around the mold cavity so that the spout is facing the mold cavity. It is also possible to arrange a nozzle unit inside the fixed mold 1 as shown in 10' to spray onto the movable mold 2 and the core.
各ノズルユニツト１０に第１図に示したと同じ
離型剤、冷却水、エアーの供給系を配設し、これ
らの制御は前記のものと同様に行う。 Each nozzle unit 10 is provided with the same mold release agent, cooling water, and air supply systems as shown in FIG. 1, and these are controlled in the same manner as described above.
第４図及び第５図にノズルヘツドの別の実施例
を示す。 Another embodiment of the nozzle head is shown in FIGS. 4 and 5.
第４図に示すノズルヘツド４′は細長い噴出口
４′0を有し、第５図に示すノズルヘツド４″は広
い噴出口に金網４″0を固定したものである。 The nozzle head 4' shown in FIG. 4 has an elongated nozzle 4'0 , and the nozzle head 4'' shown in FIG. 5 has a wire mesh 4''0 fixed to a wide nozzle.
これらのノズルヘツドを交換用として準備し、
金型及び中子の形状によつて使い分けると便利で
ある。 Prepare these nozzle heads for replacement,
It is convenient to use different types depending on the shape of the mold and core.
本発明の離型剤自動塗布装置は、金型の冷却、
水切り、離型剤の塗布、及びその水滴切りがコン
パクトな１つの装置で短時間で実施でき、離型剤
の付着が良好となるので、離型剤の使用量が少量
で済むとともに、製品の不良率が減少し、金型の
補修の手間が軽減される。
The mold release agent automatic coating device of the present invention can cool molds,
Draining water, applying mold release agent, and removing water drops can be performed in a short time with one compact device, and the mold release agent adheres well, so the amount of mold release agent used is small and the product The defective rate is reduced and the time and effort required to repair molds is reduced.
第１図は本発明の一実施例を示すもので、ノズ
ルユニツトを断面図で示す。第２図、第３図はノ
ズルユニツトの使用状態を示す図、第４図、第５
図はノズルヘツドの別の実施例を示す断面図であ
る。
１：固定金型、２：可動金型、３：ノズル本
体、４：ノズルヘツド、４0：噴出口、４1：離型
剤流入口、６：スライド部材、６0：吹出し口、
６1：チツプ、６2：中心穴、７：バネ、８：中心
軸体、８0：流出口、８1：透孔、８2：フランジ
部、１０：ノズルユニツト。
FIG. 1 shows one embodiment of the present invention, and shows a nozzle unit in sectional view. Figures 2 and 3 show how the nozzle unit is used, Figures 4 and 5.
The figure is a sectional view showing another embodiment of the nozzle head. 1: Fixed mold, 2: Movable mold, 3: Nozzle main body, 4: Nozzle head, 4 0 : Spout, 4 1 : Release agent inlet, 6: Slide member, 6 0 : Air outlet,
6 1 : Chip, 6 2 : Center hole, 7: Spring, 8: Center shaft, 8 0 : Outlet, 8 1 : Through hole, 8 2 : Flange, 10: Nozzle unit.
Claims (1)
該噴出口に冷却水とエアーを導入する透孔を有す
る中心軸体とを固定し、該中心軸体に一端に流出
口を有するスライド部材を摺動可能に嵌合し、ノ
ズル本体の離型剤収納室と前記ノズルヘツドの噴
出口との間を前記スライド部材で開閉するように
したノズルユニツトを具備することを特徴とする
離型剤自動塗布装置。1. A nozzle head having an outlet on the nozzle body and a central shaft having a through hole for introducing cooling water and air into the nozzle are fixed, and a slide member having an outlet at one end can be slid on the central shaft. 1. An automatic mold release agent applicator comprising: a nozzle unit which is fitted into a mold release agent storage chamber of a nozzle main body and a spout of the nozzle head to be opened and closed by the slide member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18668087A JPS6431554A (en) | 1987-07-28 | 1987-07-28 | Device for automatically coating parting agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18668087A JPS6431554A (en) | 1987-07-28 | 1987-07-28 | Device for automatically coating parting agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6431554A JPS6431554A (en) | 1989-02-01 |
| JPH0562016B2 true JPH0562016B2 (en) | 1993-09-07 |
Family
ID=16192764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18668087A Granted JPS6431554A (en) | 1987-07-28 | 1987-07-28 | Device for automatically coating parting agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6431554A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK171731B1 (en) * | 1995-11-30 | 1997-04-21 | Georg Fischer Disa As | Molding machine with liquid mist injection via spray can |
| JP3707207B2 (en) * | 1997-06-20 | 2005-10-19 | 宇部興産株式会社 | Method and apparatus for spraying liquid agent on molten metal contact surface |
| JP2012200776A (en) * | 2011-03-28 | 2012-10-22 | Honda Motor Co Ltd | Device for applying mold releasing agent and method for applying mold releasing agent using the same |
| CN102861900B (en) * | 2012-10-18 | 2014-07-16 | 宁波勋辉电器有限公司 | Spraying assembly structure for slide block of die-casting mold |
-
1987
- 1987-07-28 JP JP18668087A patent/JPS6431554A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6431554A (en) | 1989-02-01 |
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