JPH0521729B2 - - Google Patents
Info
- Publication number
- JPH0521729B2 JPH0521729B2 JP2120969A JP12096990A JPH0521729B2 JP H0521729 B2 JPH0521729 B2 JP H0521729B2 JP 2120969 A JP2120969 A JP 2120969A JP 12096990 A JP12096990 A JP 12096990A JP H0521729 B2 JPH0521729 B2 JP H0521729B2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- template
- cavity
- heat
- mold
- 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
- 239000011347 resin Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 11
- 125000006850 spacer group Chemical group 0.000 claims description 11
- 229920001187 thermosetting polymer Polymers 0.000 claims description 10
- 235000013351 cheese Nutrition 0.000 claims description 9
- 239000011810 insulating material Substances 0.000 claims description 9
- 238000001721 transfer moulding Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 240000002129 Malva sylvestris Species 0.000 claims description 3
- 235000006770 Malva sylvestris Nutrition 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はヒータを内蔵したトランスフアー成型
用金型に係わり、特に、型板に配設した孔の中に
先端部より基端部の発熱量が大きい棒状のヒータ
を挿入して、放熱が大きい型板外表面近傍をヒー
タの基端部により集中的に加熱するようにした金
型に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transfer molding mold with a built-in heater, and in particular, the present invention relates to a transfer molding mold having a built-in heater. The present invention relates to a mold in which a large rod-shaped heater is inserted so that the vicinity of the outer surface of the mold plate, where heat radiation is large, is heated more intensively at the base end of the heater.
一般に、熱硬化性樹脂を成形する金型において
は、キヤビテイの中に封入される樹脂を加熱して
硬化させるために、ヒータを内蔵することが行わ
れている。
Generally, a mold for molding a thermosetting resin has a built-in heater in order to heat and harden the resin sealed in the cavity.
従来、金型の中にヒータを内蔵する場合、例え
ば、キヤビテイの近傍に、金型の外側方と連通す
る複数の孔を配設して、各孔の中の棒状のヒータ
を挿入するようにしている。 Conventionally, when a heater is built into a mold, for example, multiple holes communicating with the outside of the mold are provided near the cavity, and a rod-shaped heater is inserted into each hole. ing.
しかしながら、金型の外表面から熱の一部が放
散するため、金型の中央部に比べて外表面近傍の
温度が低くなり易く、このため、金型の中央部に
配設されるキヤビテイと外表面近傍のキヤビテイ
との間に、熱硬化性樹脂のゲル化時間に差が生じ
て、硬化状態にむらを生じ、成型品にピンホー
ル、ボイド等の欠陥が発生し易い。したがつて、
金型各部の温度調整に多くの労力が必要で、温度
立上げ時間が長くなる傾向にあつた。また、この
場合、金型の外表面近傍に多くのヒータを密集状
態に配設するなどにより、金型温度の均一化を図
ることが考えられるが、構造が複雑になるなどの
問題点が生じる。
However, since some of the heat is dissipated from the outer surface of the mold, the temperature near the outer surface tends to be lower than that at the center of the mold. There is a difference in the gelation time of the thermosetting resin between it and the cavity near the outer surface, resulting in uneven curing, and defects such as pinholes and voids are likely to occur in the molded product. Therefore,
A lot of effort was required to adjust the temperature of each part of the mold, and the temperature rise time tended to be long. In this case, it may be possible to equalize the mold temperature by arranging many heaters close to the outside surface of the mold, but this may cause problems such as a complicated structure. .
また、金型にヒータを配設する場合には、当然
のごとく、ヒータの熱効率の向上を図り、できる
だけ少ない熱エネルギーで効率良くかつ均一に金
型の各キヤビテイ内の温度を保持する必要があ
る。 In addition, when a heater is installed in a mold, it is necessary to improve the thermal efficiency of the heater so that the temperature within each cavity of the mold can be maintained efficiently and uniformly with as little thermal energy as possible. .
本発明は前記問題点を有効に解決するもので、
金型各部における温度差を小さくして、温度立ち
上げ時間を短縮するとともに、その構造を簡略化
する一方、金型からの熱の放散をできるだけ抑制
することを目的とする。 The present invention effectively solves the above problems,
The purpose is to reduce the temperature difference in each part of the mold, shorten the temperature rise time, simplify the structure, and suppress the dissipation of heat from the mold as much as possible.
本発明の第１のものは、熱硬化性樹脂が封入さ
れるキヤビテイを形成した一対のチエイスに、そ
れぞれ型板が設けられ、該型板に、前記キヤビテ
イの近傍を通つて外方に連通する複数の孔が配設
されるとともに、該孔の中に、前記キヤビテイ内
の熱硬化性樹脂を加熱して硬化させるための棒状
のヒータが挿入されてなり、該ヒータは、その先
端部より基端部の発熱量が大きく設定されている
一方、前記型板とその背部を支持するスペーサと
の間に断熱材が配設されたものである。
A first aspect of the present invention is that a pair of cheeses each forming a cavity in which a thermosetting resin is sealed is provided with a mold plate, and the mold plate is connected to the outside through the vicinity of the cavity. A plurality of holes are provided, and a rod-shaped heater for heating and curing the thermosetting resin in the cavity is inserted into the hole. While the amount of heat generated at the end portion is set to be large, a heat insulating material is provided between the template and a spacer that supports the back of the template.
また、本発明の第２のものは、前記構成に加え
て、前記ヒータと基端に、その他の部分より大径
のつば部が形成されたものである。 A second aspect of the present invention is that, in addition to the above configuration, a flange portion having a larger diameter than other portions is formed at the heater and the base end.
本発明のヒータを内蔵したトランスフアー成型
用金型にあつては、型板にキヤビテイの近傍を通
つて外放に連通するように配設された複数の孔の
中に挿入され、かつ先端部より基端部の発熱量が
大きく設定されているヒータによつて、金型各部
に配設された各キヤビテイにおける温度差を低減
して、温度立ち上げ時間を短縮するとともに、各
キヤビテイで成型された成型品の品質を良好に保
持する一方、金型構造を簡略化し、かつ前記型板
の背部を支持するスペーサと該型板との間に設け
た断熱材によつて、型板からの主要な放熱経路で
あるスペーサへの熱の放散を防止し得て、熱効率
の向上を図る。
In the case of the transfer molding mold having a built-in heater of the present invention, the die is inserted into a plurality of holes arranged in the template plate so as to communicate with the outside through the vicinity of the cavity, and the tip part The heater, which is set to generate a larger amount of heat at the base end, reduces the temperature difference in each cavity arranged in each part of the mold, shortens the temperature rise time, and increases the temperature of each cavity. While maintaining good quality of the molded product, the mold structure is simplified, and the heat insulating material provided between the template and the spacer supporting the back of the template allows the main material to be removed from the template. It is possible to prevent heat dissipation to the spacer, which is a heat dissipation path, and improve thermal efficiency.
以下、本発明のトランスフアー成型用金型の一
実施例について第１図ないし第４図に基づいて説
明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a transfer molding die of the present invention will be described below with reference to FIGS. 1 to 4.
この実施例の金型は、上型１、下型２における
キヤビテイ３を形成するための各チエイス４を支
持している型板５に、複数の孔６が両型１，２の
合わせ面と平行にかつ貫通状態に設けられるとと
もに、これら各孔６に、棒状のヒータ７が孔６の
両側方から中央部までそれぞれ挿入されてなり、
該ヒータ７が、その先端部より基端部の発熱量が
大きく設定されているものである。すなわち、該
ヒータ７は、第４図に示すように、ケース８の中
にコイル状の電熱線９が収納されるとともに、先
端部Ｃ、中央部Ｂ、基端部Ａの順にコイルの巻き
数が多くされたもので、電熱線９の単位長さ当り
の発熱量は一定であるが、その巻き数の相異によ
り各部Ａ，Ｂ，Ｃ相互間における相対的な抵抗が
変えられて、その発熱量に差が生じる如くされた
ものである。また、前記各ヒータ７の基端には、
その他の部分より大径のつば部７ａが形成されて
いる。 In the mold of this embodiment, a plurality of holes 6 are formed in a mold plate 5 supporting each of the chases 4 for forming a cavity 3 in an upper mold 1 and a lower mold 2, and a plurality of holes 6 are formed on the mating surfaces of both molds 1 and 2. They are provided in parallel and penetrating state, and rod-shaped heaters 7 are inserted into each of these holes 6 from both sides of the holes 6 to the center,
The heater 7 is set to generate a larger amount of heat at its base end than at its distal end. That is, as shown in FIG. 4, in the heater 7, a coiled heating wire 9 is housed in a case 8, and the number of turns of the coil is arranged in the order of the tip C, the center B, and the base A. The amount of heat generated per unit length of the heating wire 9 is constant, but the relative resistance between each part A, B, and C changes due to the difference in the number of turns, and the This is so that there is a difference in the amount of heat generated. Further, at the base end of each heater 7,
A collar portion 7a having a larger diameter than other portions is formed.
なお、前記各ヒータ７は、第１図および第３図
に示す並列状態の３本の孔６において、両側の孔
の中に挿入されているヒータの全体発熱量が中央
の孔の中のヒータよりも大きく設定されている。
また、図中符号１０は、型板５とその背部を支持
するスペーサ１１との間に配設される断熱材、符
号１２は、キヤビテイ３と連通状態に設けられ
て、内部に熱硬化性樹脂が投入されるポツトであ
る。 In addition, in the three holes 6 arranged in parallel as shown in FIG. 1 and FIG. is set larger than .
In addition, reference numeral 10 in the figure is a heat insulating material disposed between the template 5 and a spacer 11 supporting the back thereof, and reference numeral 12 is a heat insulating material provided in communication with the cavity 3, and a thermosetting resin inside. This is the pot into which the
このように構成される金型において、各ヒータ
７に通電して発熱させると、その熱により型板５
が加熱され、該型板５の熱は、断熱材１０によつ
てスペーサ１１への熱伝達が抑制されることによ
り、型板５に密接しているチエイス４等を主とし
て加熱する。この場合、型板５およびチエイス４
等の外表面から熱の一部が放散するが、３本の孔
６における両側の孔の中のヒータの発熱量が中央
より大きく、かつ、各ヒータ７における基端部の
発熱量が先端部より大きいので、型板５およびチ
エイス４等の外表面近傍に中央部より多くの熱が
集中的に伝達され、その多い分の熱によりチエイ
ス４等の外表面から放散される熱を相殺し得て、
各キヤビテイ３の温度はほぼ均一にすることがで
きるものである。 In the mold configured in this way, when each heater 7 is energized to generate heat, the heat causes the mold plate 5 to
is heated, and the heat of the template 5 mainly heats the cheese 4 and the like that are in close contact with the template 5 because heat transfer to the spacer 11 is suppressed by the heat insulating material 10. In this case, template 5 and chase 4
Some of the heat is dissipated from the outer surface of the three holes 6, but the amount of heat generated by the heaters in the holes on both sides of the three holes 6 is larger than that in the center, and the amount of heat generated at the base end of each heater 7 is greater than the amount of heat generated at the tip end. Since it is larger, more heat is concentratedly transmitted to the outer surfaces of the template 5, the cheese 4, etc. than the central part, and the heat dissipated from the outer surfaces of the cheese 4, etc. can be offset by the large amount of heat. hand,
The temperature of each cavity 3 can be made substantially uniform.
また、ヒータ７の基端に形成された、その他の
部分より大径のつば部７ａを利用することによつ
て、型板５の孔６にヒータ７を挿入する際、ある
いはヒータ７の交換をするために型板５の孔６か
らヒータ７を引き抜く際に、ヒータ７の着脱操作
を容易に行うことができる。そして、前記ヒータ
７のつば部７ａを利用して型板５の孔６にヒータ
７を挿入する場合に、きつい嵌合関係であつても
容易に挿入を行うことができるから、ヒータ７の
ケース８と型板５の孔６との密着性を良好にする
ことができ、従つて、ヒータ７と型板５との間の
熱伝達性を大幅に向上させることができる。 Furthermore, by using the flange 7a formed at the base end of the heater 7, which has a larger diameter than other parts, it is possible to insert the heater 7 into the hole 6 of the template 5 or to replace the heater 7. When the heater 7 is pulled out from the hole 6 of the template 5, the heater 7 can be easily attached and detached. When inserting the heater 7 into the hole 6 of the template 5 using the flange 7a of the heater 7, the insertion can be easily performed even in a tight fitting relationship. The adhesion between the heater 7 and the hole 6 of the template 5 can be improved, and therefore the heat transfer between the heater 7 and the template 5 can be significantly improved.
なお、各ヒータ７毎の熱量あるいはヒータ７各
部における発熱量は、金型の大きさ、ヒータ７お
よびキヤビテイ３の配設数や配設位置等と、希望
する金型温度との関連により設定される。また、
前記一実施例では、一体的なコイル状の電熱線９
によりヒータ７を構成して、電熱線９を巻き数を
ヒータ７の各部で変えるようにしたが、該一実施
例の構成に限定されるものではなく、例え抵抗が
異なる電熱線を横一列に並べて、これらを直列あ
るいは並列に連結した構成としてもよく、要は、
ヒータの先端部より基端部の発熱量を大きくする
ものであればよい。 The amount of heat generated by each heater 7 or the amount of heat generated at each part of the heater 7 is set depending on the size of the mold, the number and position of the heaters 7 and cavities 3, and the desired mold temperature. Ru. Also,
In the embodiment, an integral coiled heating wire 9
Although the heater 7 is configured so that the number of turns of the heating wire 9 is changed in each part of the heater 7, the configuration is not limited to the one embodiment. They may be arranged in series or connected in parallel.
Any heater may be used as long as it generates a larger amount of heat at the proximal end than at the distal end of the heater.
以上説明したように、本発明におけるヒータを
内蔵したトランスフアー成型用金型によれば、次
のような効果を奏することができる。
As explained above, according to the transfer molding mold having a built-in heater according to the present invention, the following effects can be achieved.
(i) 型板の孔の中に挿入されているヒータの基端
部の発熱量が先端部より大きく設定されている
ことにより、該ヒータの基端部から発生される
熱が型板の外表面近傍を集中的に加熱し得て、
型板の外表面から放散される熱を相殺し得るの
で、型板及びチエイスにおける温度差を小さく
し得て、温度の均一化を図ることが容易にな
り、したがつて、チエイスの温度立ち上げ時間
を短縮し得るとともに、各キヤビテイにおける
熱硬化樹脂の硬化状態をほぼ一定にし得て、成
型品の品質を向上させることができる。(i) The heat generated from the base end of the heater inserted into the hole in the template is set to be larger than the distal end, so that the heat generated from the base end of the heater is transferred to the outside of the template. It can intensively heat the vicinity of the surface,
Since the heat dissipated from the outer surface of the template can be offset, the temperature difference between the template and the cheese can be reduced, making it easier to achieve temperature uniformity, and therefore reducing the temperature rise of the cheese. The time can be shortened, and the cured state of the thermosetting resin in each cavity can be made almost constant, so that the quality of the molded product can be improved.
(ii) 棒状のヒータにおける基端部の発熱量を先端
部より大きく設定したので、型板の外側方から
孔の中に挿入することにより、確実に型板外表
面近傍に多くの熱を伝達し得て、前記従来例に
おける多数本のヒータを型板外表面近傍に密集
状態に配設する場合等に比べて、その構造を簡
略化することができる。(ii) Since the amount of heat generated at the base end of the rod-shaped heater is set to be larger than that at the tip, by inserting it into the hole from the outside of the template, a large amount of heat can be reliably transferred to the vicinity of the outside surface of the template. Therefore, the structure can be simplified compared to the case where a large number of heaters are densely arranged near the outer surface of the mold plate in the conventional example.
(iii) 型板とその背部を支持するスペーサとの間に
配設した断熱材によつて、型板からの主要の熱
の放散経路であるスペーサへの熱伝達を遮断
し、かつ型板からの放熱を抑制することによ
り、ヒータの熱効率の向上を図ることができる
と共に、できるだけ少ない熱エネルギーによつ
て効率良くかつ均一にチエイスの各キヤビテイ
内の温度を保持することができる。(iii) A heat insulating material placed between the template and the spacer that supports the back of the template blocks heat transfer from the template to the spacer, which is the main heat dissipation path, and prevents heat transfer from the template to the spacer. By suppressing the heat dissipation, it is possible to improve the thermal efficiency of the heater, and it is also possible to efficiently and uniformly maintain the temperature in each cavity of the cheese with as little thermal energy as possible.
また、本発明の第２のものによれば、上記
(i)、(ii)、(iii)の効果に加えて、
(iv) 棒状のヒータの基端に形成された、その他の
部分により大径のつば部を利用することによつ
て、型板の孔に対するヒータの着脱操作をより
容易に行うことができる上に、型板の孔とヒー
タとの嵌め合いがより厳しくなつても、ヒータ
を型板の孔に円滑に挿入することができるか
ら、ヒータと型板の孔との密着性を大幅に向上
させることができて、ヒータから型板への熱伝
達性を著しく改善でき、従つて、熱効率の向上
を図ることができる。 Moreover, according to the second aspect of the present invention, the above-mentioned
In addition to the effects of (i), (ii), and (iii), (iv) the template can be easily This makes it easier to attach and detach the heater to the hole in the template, and even if the fit between the hole in the template and the heater becomes tighter, the heater can be inserted smoothly into the hole in the template. , it is possible to significantly improve the adhesion between the heater and the hole in the mold plate, and the heat transfer from the heater to the mold plate can be significantly improved, thereby making it possible to improve thermal efficiency.
第１図は本発明のトランスフアー成型用金型の
一実施例を示す側面図、第２図は第１図の−
線に沿う一部を省略した矢視断面図、第３図は第
１図の−線に沿う矢視図、第４図は第１図の
金型に内蔵されるヒータの断面図である。
１……上型、２……下型、３……キヤビテイ、
４……チエイス、５……型板、６……孔、７……
ヒータ、７ａ……つば部、８……ケース、９……
電熱線、１０……断熱材、１１……スペーサ、１
２……ポツト、Ａ……基端部、Ｂ……中央部、Ｃ
……先端部。
FIG. 1 is a side view showing an embodiment of the transfer molding mold of the present invention, and FIG.
3 is a cross-sectional view taken along the line with a portion omitted, FIG. 3 is a view taken along the - line of FIG. 1, and FIG. 4 is a cross-sectional view of the heater built into the mold shown in FIG. 1. 1... Upper mold, 2... Lower mold, 3... Cavity,
4... Chase, 5... Template, 6... Hole, 7...
Heater, 7a...Brim portion, 8...Case, 9...
Heating wire, 10...Insulating material, 11...Spacer, 1
2...Pot, A...Proximal end, B...Central part, C
...Tip.
Claims (1)
した一対のチエイスに、それぞれ型板が設けら
れ、該型板に、前記キヤビテイの近傍を通つて外
方に連通する複数の孔が配設されるとともに、該
孔の中に、前記キヤビテイ内の熱硬化性樹脂を加
熱して硬化させるための棒状のヒータが挿入され
てなり、該ヒータは、その先端部より基端部の発
熱量が大きく設定されている一方、前記型板とそ
の背部を支持するスペーサとの間に断熱材が配設
されたことを特徴とするヒータを内蔵したトラン
スフアー成型用金型。 ２ 熱硬化性樹脂が封入されるキヤビテイを形成
した一対のチエイスに、それぞれ型板が設けら
れ、該型板に、前記キヤビテイの近傍を通つて外
方に連通する複数の孔が配設されるとともに、該
孔の中に、前記キヤビテイ内の熱硬化性樹脂を加
熱して硬化させるための棒状のヒータが挿入され
てなり、該ヒータは、その先端部より基端部の発
熱量が大きく設定されている一方、前記ヒータの
基端に、その他の部分より大径のつば部が形成さ
れ、また、前記型板とその背部を支持するスペー
サとの間に断熱材が配設されたことを特徴とする
ヒータを内蔵したトランスフアー成型用金型。[Scope of Claims] 1. A pair of cheeses each forming a cavity in which a thermosetting resin is sealed is provided with a mold plate, and the mold plate has a plurality of molds that communicate with the outside through the vicinity of the cavity. A hole is provided, and a rod-shaped heater for heating and curing the thermosetting resin in the cavity is inserted into the hole, and the heater extends from the distal end to the proximal end. 1. A transfer molding mold having a built-in heater, characterized in that the amount of heat generated by the mold plate is set to be large, and a heat insulating material is provided between the mold plate and a spacer supporting the back of the mold plate. 2. A template is provided on each of the pair of cheeses forming a cavity in which a thermosetting resin is sealed, and a plurality of holes are provided in the template that communicate with the outside through the vicinity of the cavity. At the same time, a rod-shaped heater is inserted into the hole to heat and harden the thermosetting resin in the cavity, and the heater is set to generate a larger amount of heat at its base end than at its distal end. On the other hand, a collar portion having a larger diameter than the other portions is formed at the base end of the heater, and a heat insulating material is provided between the template and a spacer supporting the back portion thereof. A transfer molding mold with a built-in heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12096990A JPH03205118A (en) | 1990-05-10 | 1990-05-10 | Mold with built-in heater for transfer molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12096990A JPH03205118A (en) | 1990-05-10 | 1990-05-10 | Mold with built-in heater for transfer molding |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6617385A Division JPS61225009A (en) | 1985-03-29 | 1985-03-29 | Mold having heater mounted therein for molding thermosetting resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03205118A JPH03205118A (en) | 1991-09-06 |
| JPH0521729B2 true JPH0521729B2 (en) | 1993-03-25 |
Family
ID=14799506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12096990A Granted JPH03205118A (en) | 1990-05-10 | 1990-05-10 | Mold with built-in heater for transfer molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03205118A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5311328A (en) * | 1976-07-19 | 1978-02-01 | Hitachi Ltd | Heater and resin-packing metal mold equipped with heater |
| JPS5353952U (en) * | 1976-10-08 | 1978-05-09 | ||
| JPS5993315A (en) * | 1982-11-19 | 1984-05-29 | Hitachi Ltd | Mold |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5776394U (en) * | 1980-10-29 | 1982-05-11 |
-
1990
- 1990-05-10 JP JP12096990A patent/JPH03205118A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5311328A (en) * | 1976-07-19 | 1978-02-01 | Hitachi Ltd | Heater and resin-packing metal mold equipped with heater |
| JPS5353952U (en) * | 1976-10-08 | 1978-05-09 | ||
| JPS5993315A (en) * | 1982-11-19 | 1984-05-29 | Hitachi Ltd | Mold |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03205118A (en) | 1991-09-06 |
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