JPS633941A - Preparation of grid structure - Google Patents
Preparation of grid structureInfo
- Publication number
- JPS633941A JPS633941A JP61148835A JP14883586A JPS633941A JP S633941 A JPS633941 A JP S633941A JP 61148835 A JP61148835 A JP 61148835A JP 14883586 A JP14883586 A JP 14883586A JP S633941 A JPS633941 A JP S633941A
- Authority
- JP
- Japan
- Prior art keywords
- prepreg materials
- grid structure
- prepreg
- frame
- prepreg material
- 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
- 239000000463 material Substances 0.000 claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000010030 laminating Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 6
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 238000003475 lamination Methods 0.000 description 5
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【発明の詳細な説明】
[発明の目的]
(産業上の利用分野)
この発明は、繊維強化プラスチック酸のグリッド構造体
の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for producing a grid structure of fiber-reinforced plastic acid.
(従来の技術)
一般に、繊維強化プラスチック(FRP)製のグリッド
構造体としては、例えば第45!Jに示すようなものが
ある。(Prior Art) Generally, as a grid structure made of fiber reinforced plastic (FRP), for example, No. 45! There is something like the one shown in J.
図中のグリッド構造体Gは、一対のリング状枠部101
,102と、両枠部101,102の間で一体的に交差
し且つ両枠部101.102を連結する多数の桟部10
3とを備えた筒形を成すものであって、人工衛星の中核
構造体やロケットの最上段部におけるキックモータとそ
の下段のロケットモータとの接手などに用いられており
、材質としては、とくに炭素繊維を用いたm維強化プラ
スチック(CFRP)が適用されている。The grid structure G in the figure includes a pair of ring-shaped frames 101
, 102, and a large number of crosspieces 10 that integrally intersect between both frame parts 101 and 102 and connect both frame parts 101 and 102.
It has a cylindrical shape with a M-fiber reinforced plastic (CFRP) using carbon fiber is used.
従来において、上記グリッド構造体Gの製造にあっては
、第5図(a)〜(d)に示すように、各部位に対応す
る多種類のプリプレグ材を用いていた。Conventionally, in manufacturing the grid structure G, as shown in FIGS. 5(a) to 5(d), various types of prepreg materials were used for each part.
前記プリプレグ材は、大別すると、枠部用プリプレグ材
、枠部との連結部付近に用いる連結部用プリプレグ材、
および桟部プリプレグ材に分けられている。枠部用プリ
プレグ材は、枠部だけに対応するプリプレグ材A1と、
枠部および連結部の一部に対応するプリプレグ材A2と
がある。連結部用プリプレグ材は、連結部の一部に対応
するプリプレグ材B1.B2と、連結部に加えて枠部お
よび桟部の一部に対応するプリプレグ材B3゜B4とが
ある。桟部用プリプレグ材は、一方の枠部側から桟部の
交点を超えて直線的に他方の枠部側へ至るプリプレグ材
CI 、C3,C5,C7と、枠部側から桟部の交点ま
での間に対応するプリプレグ材C2,C4,C6,C8
とがあり、主に前記連結用プリプレグ材B1〜B4の諸
寸法に応じて、枠部および連結部の一部にも対応するも
のや長さ寸法の異なるものがある。The prepreg material can be roughly divided into frame prepreg material, connecting part prepreg material used near the connecting part with the frame,
It is divided into prepreg material and crosspiece prepreg material. The prepreg material for the frame portion is a prepreg material A1 that corresponds only to the frame portion,
There is a prepreg material A2 corresponding to a part of the frame part and the connecting part. The prepreg material for the connecting portion is prepreg material B1. corresponding to a part of the connecting portion. B2, and prepreg materials B3 and B4 corresponding to the frame portion and part of the crosspiece in addition to the connecting portion. The prepreg material for the crosspiece consists of prepreg materials CI, C3, C5, and C7 that extend straight from one frame side beyond the intersection of the crosspieces to the other frame side, and from the frame side to the intersection of the crosspieces. Corresponding prepreg materials C2, C4, C6, C8 between
Depending on the dimensions of the connecting prepreg materials B1 to B4, there are some that correspond to part of the frame and the connecting section, and others that have different length dimensions.
そして、グリッド構造体Gを製造するには、当該グリッ
ド構造体Gに対応した溝を有する雌型に、上記各プリプ
レグ材AI、A2.B1〜B4.C1〜C8を適宜に組
合わせて積層し、同様の積層パターンを繰返し行ったの
ち、雄型でプリプレグ材を押圧整形し、さらに硬化処理
を施して前記グリッド構造体Gを形成する。このような
グリッド構造体の製造方法としては、例えば、本件の出
願人が先に出願した特願昭60−86231号がある。In order to manufacture the grid structure G, each of the prepreg materials AI, A2. B1-B4. After laminating C1 to C8 in appropriate combinations and repeating the same lamination pattern, the prepreg material is pressed and shaped with a male mold, and further hardened to form the grid structure G. As a method for manufacturing such a grid structure, there is, for example, Japanese Patent Application No. 86231/1989, which was previously filed by the applicant of the present invention.
(発明が解決しようとする問題点)
ところが、上記したようなグリッド構造体の製造方法に
あっては、繊維を多方向に配向することができるととも
に部分的な補強を行うことができるなどの利点を有する
のであるが、プリプレグ材の種類が多いことから、製造
時の管理が複雑で作業に比較的長い時間を要するという
面があり、その改善が望まれていた。(Problems to be Solved by the Invention) However, the method for manufacturing a grid structure as described above has advantages such as being able to orient fibers in multiple directions and performing partial reinforcement. However, since there are many types of prepreg materials, the management during manufacturing is complicated and the work takes a relatively long time, and an improvement has been desired.
(発明の目的)
この発明は、このような従来の要望に鑑みて成されたも
ので、従来技術の利点を活かしてグリッド構造体の充分
な強度を得ることができると共に、製造時の管理を簡素
化し且つ作業性の向上を実現することができるグリッド
構造体の製造方法を提供することを目的としている。(Objective of the Invention) The present invention has been made in view of such conventional demands, and it is possible to obtain sufficient strength of the grid structure by taking advantage of the advantages of the conventional technology, and also to improve management during manufacturing. It is an object of the present invention to provide a method for manufacturing a grid structure that can be simplified and improve workability.
[発明の構成]
(問題点を解決するための手段)
この発明によるグリッド構造体の製造方法は、一対の枠
部とこの両枠部の中間で交差し且つ両枠部を連結する桟
部とを備えた繊維強化プラスチック製のグリッド構造体
を製造するに際し、一方の枠部外縁から他方の枠部外縁
に至り桟部を構成する第1プリプレグ材と、枠部を構成
するとともに枠部から桟部の中央まで延出する部分を有
する第2プリプレグ材とを用い、前記第1プリプレグ材
が桟部において順次交差する状態にして両プリプレグ材
を一方の型に積層したのち、他方の型で前記プリプレグ
材を押圧整形し、次いで前記プリプレグ材に硬化処理を
施してグリッド構造体を形成することを特徴としている
。[Structure of the Invention] (Means for Solving the Problems) A method for manufacturing a grid structure according to the present invention includes a pair of frame portions, a crosspiece portion that intersects between the two frame portions and connects the two frame portions; When manufacturing a grid structure made of fiber-reinforced plastic with Using a second prepreg material having a portion extending to the center of the section, the first prepreg material is laminated in one mold so that the first prepreg material intersects sequentially at the crosspiece, and then the prepreg material is laminated in the other mold. The method is characterized in that a prepreg material is pressed and shaped, and then the prepreg material is subjected to a curing treatment to form a grid structure.
(実施例) 以下、この発明を図面に基づいて説明する。(Example) The present invention will be explained below based on the drawings.
第1図〜第3図は、この発明の一実施例を説明する図で
ある。なお、この実施例では、従来技術の項で示したグ
リッド構造体(第4図参照)とほぼ同一のものを製造す
る場合を例示している。FIGS. 1 to 3 are diagrams illustrating an embodiment of the present invention. Note that this embodiment exemplifies the case where a grid structure that is substantially the same as the grid structure (see FIG. 4) shown in the section of the prior art is manufactured.
第1図は当該製造方法に用いるプリプレグ材を説明する
図であるが、この図に基づいてグリッド構造体の各部位
を説明すると、グリッド構造体は、一対のリング状枠部
101,102と、両枠部101,102の中央で一体
的に交差し且つ両枠部101.102を連結する桟部1
03とを備えており、各枠部101.102の内縁(互
いに対向する縁)と二方向から接近する桟部103とが
一体化する部位を連結部104とし、桟部103の中央
を交差部105とする。そして、グリッド構造体は、上
記の形態を円周方向に連続させた筒形になっている。FIG. 1 is a diagram for explaining the prepreg material used in the manufacturing method. When explaining each part of the grid structure based on this diagram, the grid structure includes a pair of ring-shaped frames 101 and 102, A crosspiece 1 that integrally intersects at the center of both frame parts 101 and 102 and connects both frame parts 101 and 102.
03, the part where the inner edges (edges facing each other) of each frame part 101, 102 and the crosspiece 103 approaching from two directions are integrated is the connecting part 104, and the center of the crosspiece 103 is the intersection part. 105. The grid structure has a cylindrical shape in which the above configuration is continuous in the circumferential direction.
プリプレグ材は、例えば炭素繊維を配向させて成るマッ
トに熱硬化性樹脂を含浸して乾燥させたものであり、一
方の枠部101の外縁から他方の枠部102の外線に至
り桟部103を構成する帯状の第1プリプレグ材1と、
枠部101(102)を構成するとともに枠部101(
102)から桟部103の交差部105まで延出する部
分(桟部103の一部分)を有する第2プリプレグ材2
とがある。前記第1プリプレグ材1は、交差部105を
超えた状態で桟部103に対応する部位に対して、連結
部104および枠部101.102の一部に対応する部
位が当該グリッド構造体の軸方向(第1図の左右方向)
に屈曲しており、この形状の長手方向に沿って繊維が配
向しである。前記第2プリプレグ材2は、枠部101.
102および連結部104の一部と、連結部104から
交差部105に至る桟部103とに対応して前記第1プ
リプレグ材1とともにグリッド構造体の形状を構成し、
この実施例では直交する二方向に繊維が配向しである。The prepreg material is, for example, a mat made of oriented carbon fibers impregnated with a thermosetting resin and dried. A first strip-shaped prepreg material 1,
It constitutes the frame part 101 (102) and the frame part 101 (
102) to the intersection 105 of the crosspiece 103 (part of the crosspiece 103).
There is. In the first prepreg material 1, the portion corresponding to the connecting portion 104 and a part of the frame portions 101 and 102 is aligned with the axis of the grid structure with respect to the portion corresponding to the crosspiece portion 103 beyond the intersection portion 105. Direction (left/right direction in Figure 1)
The fibers are oriented along the longitudinal direction of this shape. The second prepreg material 2 has a frame portion 101.
102, a part of the connecting portion 104, and the crosspiece 103 extending from the connecting portion 104 to the intersection portion 105, forming a shape of a grid structure together with the first prepreg material 1,
In this embodiment, the fibers are oriented in two orthogonal directions.
なお、両プリプレグ材1,2は、厚さをほぼ同一にして
形成しである。Note that both prepreg materials 1 and 2 are formed to have substantially the same thickness.
第3図はグリッド構造体を製造するのに用いる装置の一
例を説明する図であって、符号10は円筒形を成し且つ
軸11で回転可能に保持されたコアであり、このコア1
0の外周に一方の型とじての雌型を構成している。この
雌型を構成するにあたっては、前記コア10の外周に、
分割可能な円筒部材12とその両端に位置するリング1
3゜14とを嵌装するとともに、前記円筒部材12の円
周方向中央に沿って複数の斜方形治具15を配設し、さ
らに各斜方形治具15の間に三角形治具16を配設して
いる。なお、各治具15,16はボルト類を用いて固定
してあり、着脱可能である。そして、上記の装置は、各
リング13.14および各治具15.16の間に、グリ
ッド構造体の形状に合致した形成用溝17を形成してい
る。FIG. 3 is a diagram illustrating an example of an apparatus used for manufacturing a grid structure, and reference numeral 10 denotes a core having a cylindrical shape and rotatably held around a shaft 11.
A female mold is constructed by closing one mold on the outer periphery of the 0. In constructing this female mold, on the outer periphery of the core 10,
Dividable cylindrical member 12 and rings 1 located at both ends thereof
At the same time, a plurality of rhombic jigs 15 are arranged along the circumferential center of the cylindrical member 12, and a triangular jig 16 is further arranged between each rhombic jigs 15. It is set up. Note that each of the jigs 15 and 16 is fixed using bolts and is removable. The above-mentioned device forms forming grooves 17 that match the shape of the grid structure between each ring 13.14 and each jig 15.16.
また、符号18,1りは他方の型としての枠部用雄型お
よび桟部用雄型であって、両雄型18゜12はいくつか
に分割してあり(図には一部を示す)、形成用溝17に
おける枠部形成部位と桟部形成部位とに夫々対向する突
部18a、19Lを有している。前記両雄型18,1り
はボルトを用いてリング13.14および円筒部材12
に固定することができる。Further, reference numerals 18 and 1 are the other molds, a male mold for the frame and a male mold for the crosspiece, and both male molds 18° and 12 are divided into several parts (partially shown in the figure). , protrusions 18a and 19L are respectively opposed to the frame portion forming portion and the crosspiece forming portion in the forming groove 17. Both male and female molds 18 and 1 are connected to the ring 13, 14 and the cylindrical member 12 using bolts.
can be fixed to.
上記の装置を用いてグリッド構造体を製造するには、ま
ず前述の両プリプレグ材1.2を雌型の形成用溝17内
に積層する。この積層工程は、所定数の第1プリプレグ
材1を同一の向きにして雌型の円周方向に配設するとと
もに、各第1プリプレグ材1の間に第2プリプレグ材2
を各々配設しく第1図の状態)、次に、第2図に示すよ
うに、第1プリプレグ材1を先に配設した第1プリプレ
グ材1と桟部において交差する状S(第1図に対して裏
返しにした状態)にして積層するとともに、同様にして
第2プリプレグ材2を積層し、以下、同工程を繰返し行
う、そして、両プリプレグ材1,2を所定の厚さまで積
層したのちには、リング13.14および円筒部材12
に各雄型18.19を固定してプリプレグ材1,2を押
圧整形し、次いで前記プリプレグ材1,2に熱処理(硬
化処理)を施すことにより、グリッド構造体(第4図参
照)を形成する。なお、形成後のグリッド構造体は、リ
ング13.14.各治具15.16および円筒部材12
を取外しあるいは分解して取出す。To manufacture a grid structure using the above-mentioned apparatus, first, both prepreg materials 1.2 described above are laminated in the forming groove 17 of the female mold. In this lamination process, a predetermined number of first prepreg materials 1 are arranged in the same direction in the circumferential direction of the female mold, and a second prepreg material 2 is placed between each of the first prepreg materials 1.
Next, as shown in FIG. 2, the first prepreg material 1 is arranged in a shape S (the state shown in FIG. Then, the second prepreg material 2 was laminated in the same way (the state turned upside down with respect to the figure), and the same process was repeated, and both prepreg materials 1 and 2 were laminated to a predetermined thickness. Later on, the rings 13, 14 and the cylindrical member 12
The prepreg materials 1 and 2 are pressed and shaped by fixing the respective male molds 18 and 19 to the molds, and then heat treatment (hardening treatment) is performed on the prepreg materials 1 and 2 to form a grid structure (see FIG. 4). do. Note that the grid structure after formation has rings 13, 14, . Each jig 15, 16 and cylindrical member 12
Remove or disassemble and take out.
このようにして製造されたグリッド構造体は、2種類の
プリプレグ材1,2を用いた簡単な積層パターンで形成
されたものであるが、強度を左右するm#Iの配向状態
を各部位にわたって良好に得ることができると共に、当
然プリプレグ材同士の継目数を著しく減らすことができ
、とくにこの実施例では、直交する二方向へ繊維を配向
させた第2プリプレグ材2を用いたため、強度をより一
層向上させることができる。また、繊維をより多方向に
配向させたり、部分的に補強したりすることも可能であ
り、例えば積層工程の途中あるいは仕上げの際に、枠部
101,102の円周方向に巻き付ける他のプリプレグ
材などを併用しても問題はない、さらに、グリッド構造
体やプリプレグ材の詳細な形状等が上記実施例に限定さ
れることはない。The grid structure manufactured in this way was formed with a simple lamination pattern using two types of prepreg materials 1 and 2, but the orientation state of m#I, which affects strength, was adjusted throughout each part. Not only can the number of joints between the prepreg materials be reduced significantly, but especially in this example, since the second prepreg material 2 with fibers oriented in two orthogonal directions is used, the strength can be further increased. This can be further improved. It is also possible to orient the fibers in more directions or to partially reinforce the fibers. For example, during the lamination process or during finishing, other prepregs can be wrapped around the circumferential direction of the frames 101 and 102. There is no problem even if other materials are used in combination. Furthermore, the detailed shapes of the grid structure and the prepreg material are not limited to the above embodiments.
[発明の構成]
以上説明してきたように、この発明のグリッド構造体の
製造方法によれば、一対の枠部とこの両枠部の中間で交
差し且つ両枠部を連結する桟部とを備えたtara強化
プラスチック製のグリッド構造体を製造するに際し、一
方の枠部外縁から他方の枠部外縁に至り桟部を構成する
第1プリプレグ材と、枠部を構成するとともに枠部から
桟部の中央まで延出する部分を有する第2プリプレグ材
とを用い、前記第1プリプレグ材が桟部において順次交
差する状態にして両プリプレグ材を一方の型に積層した
のち、他方の型で前記プリプレグ材を押圧整形し、次い
で前記プリプレグ材に硬化処理を施してグリッド構造体
を形成する方法としたため、製造時の管理を簡素化し且
つ作業性を著しく向上させることができるとともに、グ
リッド構造体の強度向上を図ることができるという優れ
た効果を奏する。[Structure of the Invention] As described above, according to the method for manufacturing a grid structure of the present invention, a pair of frame portions and a crosspiece portion that intersects between the two frame portions and connects the two frame portions are combined. When manufacturing a grid structure made of reinforced plastic, a first prepreg material that extends from the outer edge of one frame to the outer edge of the other frame and constitutes the crosspiece, and a first prepreg material that constitutes the frame and extends from the frame to the crosspiece. After laminating both prepreg materials in one mold with the first prepreg materials intersecting sequentially at the crosspieces, the prepreg materials are laminated in the other mold. The method of forming the grid structure by pressing and shaping the prepreg material and then hardening the prepreg material simplifies the management during manufacturing, significantly improves workability, and improves the strength of the grid structure. This has the excellent effect of improving performance.
第1図はこの発明の一実施例によるプリプレグ材の形状
および配設要領を示す説明図、第2図は第1図に示す配
設状態と交互に行う積層要領を示す説明図、第3図はこ
の発明の製造方法に適用可能な装置の一例を説明する斜
視図、第4図は構造体の一例を説明する斜視図、第5図
(a)〜(d)は従来の製造方法に用いるプリプレグ材
の種類を示す各々説明図である。
1・・・第1プリプレグ材、
2・・・第2プリプレグ材、
101.102・・・枠部。
103・・・桟部、
G・・・グリッド構造体。
特許出願人 日産自動車株式会社代理人弁理士
小 塩 豊
C%JFIG. 1 is an explanatory diagram showing the shape and arrangement procedure of the prepreg material according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the arrangement state shown in FIG. 1 and the lamination procedure alternately performed, and FIG. is a perspective view illustrating an example of a device applicable to the manufacturing method of the present invention, FIG. 4 is a perspective view illustrating an example of a structure, and FIGS. FIG. 3 is an explanatory diagram showing the types of prepreg materials. 1... First prepreg material, 2... Second prepreg material, 101.102... Frame portion. 103... Crosspiece, G... Grid structure. Patent applicant: Patent attorney representing Nissan Motor Co., Ltd.
Yutaka Koshio C%J
Claims (1)
部を連結する桟部とを備えた繊維強化プラスチック製の
グリッド構造体を製造するに際し、一方の枠部外縁から
他方の枠部外縁に至り桟部を構成する第1プリプレグ材
と、枠部を構成するとともに枠部から桟部の中央まで延
出する部分を有する第2プリプレグ材とを用い、前記第
1プリプレグ材が桟部において順次交差する状態にして
両プリプレグ材を一方の型に積層したのち、他方の型で
前記プリプレグ材を押圧整形し、次いで前記プリプレグ
材に硬化処理を施してグリッド構造体を形成することを
特徴とするグリッド構造体の製造方法。(1) When manufacturing a fiber-reinforced plastic grid structure comprising a pair of frame portions and a crosspiece that intersects between the two frame portions and connects the two frame portions, from the outer edge of one frame portion to the other. A first prepreg material that reaches the outer edge of the frame and forms the crosspiece, and a second prepreg material that forms the frame and has a portion extending from the frame to the center of the crosspiece, After laminating both prepreg materials in one mold so that they intersect sequentially at the crosspiece, the prepreg material is pressed and shaped using the other mold, and then the prepreg material is subjected to a curing treatment to form a grid structure. A method for manufacturing a grid structure characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61148835A JPH0622945B2 (en) | 1986-06-24 | 1986-06-24 | Method for manufacturing grid structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61148835A JPH0622945B2 (en) | 1986-06-24 | 1986-06-24 | Method for manufacturing grid structure |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS633941A true JPS633941A (en) | 1988-01-08 |
JPH0622945B2 JPH0622945B2 (en) | 1994-03-30 |
Family
ID=15461797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61148835A Expired - Lifetime JPH0622945B2 (en) | 1986-06-24 | 1986-06-24 | Method for manufacturing grid structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0622945B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010023366A (en) * | 2008-07-22 | 2010-02-04 | Mitsubishi Electric Corp | Advanced grid structure with insert |
-
1986
- 1986-06-24 JP JP61148835A patent/JPH0622945B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010023366A (en) * | 2008-07-22 | 2010-02-04 | Mitsubishi Electric Corp | Advanced grid structure with insert |
Also Published As
Publication number | Publication date |
---|---|
JPH0622945B2 (en) | 1994-03-30 |
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