JPS6061218A - Molding process of hollow double wall box - Google Patents
Molding process of hollow double wall boxInfo
- Publication number
- JPS6061218A JPS6061218A JP58168144A JP16814483A JPS6061218A JP S6061218 A JPS6061218 A JP S6061218A JP 58168144 A JP58168144 A JP 58168144A JP 16814483 A JP16814483 A JP 16814483A JP S6061218 A JPS6061218 A JP S6061218A
- Authority
- JP
- Japan
- Prior art keywords
- partition plates
- hollow double
- mold
- double wall
- wall box
- 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
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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
-
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0033—Moulds or cores; Details thereof or accessories therefor constructed for making articles provided with holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2024/00—Articles with hollow walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7162—Boxes, cartons, cases
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
この発明は、生産性の合理化と衝撃強度向上に対して好
適な硬質発泡樹脂の反応射出成形による中空二重壁箱体
の成形方法に関するものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for forming a hollow double-walled box by reaction injection molding of a hard foam resin, which is suitable for streamlining productivity and improving impact strength. be.
硬質発泡樹脂例えば硬質ポリウレタンを反応射出成形し
て作られた箱体は、電算機端末ハウジングや車載冷蔵庫
の箱体等に用いられているが、従来の硬質ポリウレタン
の反応射出成形によＸ厚肉箱体の成形方法によれば、成
形品の表層部が破細のスギン層で形成され、内部は軟質
のコア層からなるサンドイッチ構造の中実品が成形され
た。このような中実品の場合は、成形時に生じる反応熱
が高くなるため、材料の硬化時間が長くかかる。また材
料の使用量が多く、例えば後述の第５図に示すように、
箱体の大きさ２００Ｘ’＋ＯＯＸ３００ｍｍ 、厚さ２
５龍、成形品密度０．３ｆ廓の箱体を成形するのに約２
５００９の材料を必要とした。また後述の第６図に示す
ように、上記の成形品を成形する場合、型内における硬
化時間は約１７分もかかった。このように生産性の点で
問題がある上、この成形品における硬質の表層部の厚さ
は、最大１．５〜２．０龍であるが、この厚さでは衝撃
強度が弱いという欠点があった。Boxes made by reaction injection molding of rigid foamed resin, such as rigid polyurethane, are used for computer terminal housings, car refrigerator boxes, etc., but conventional reaction injection molding of rigid polyurethane produces According to the method for molding the box, a solid product with a sandwich structure was formed, in which the surface layer of the molded product was formed of a thin sag layer and the interior was made of a soft core layer. In the case of such a solid product, the reaction heat generated during molding is high, so it takes a long time for the material to harden. Also, the amount of materials used is large, for example, as shown in Figure 5 below,
Box size 200X'+OOX300mm, thickness 2
5 dragons, it takes about 2 to mold a box with a molded product density of 0.3 f.
5009 materials were required. Further, as shown in FIG. 6, which will be described later, when molding the above-mentioned molded product, it took about 17 minutes for curing in the mold. In addition to this problem in terms of productivity, the maximum thickness of the hard surface layer of this molded product is 1.5 to 2.0 mm, which has the disadvantage of low impact strength. there were.
この発明の目的は、上記した従来技術の欠点をなくして
、生璽性全高め、衝撃強度を向上するために、硬質ポリ
ウレタンの反応射出成形による中空二重壁箱体の成形方
法を提供するにある。An object of the present invention is to provide a method for forming a hollow double-walled box by reaction injection molding of rigid polyurethane, in order to eliminate the drawbacks of the prior art described above, and to improve overall sealability and impact strength. be.
要するにこの発明は、上型コア部の周囲に固定した複敬
個の仕切板にょシ、上記上型コア部と仕切板および下型
キャビテイ面と仕切板との間に狭い空間部を形成し、材
料を型内に注入後反応硬化させ、箱体の側壁面にリブを
形成しつつ中空二重壁箱体を成形することであシ、寸た
箱体の底部は別に成形したリブ付き底板全固定して箱体
低部も中空二重壁に成形するものである。In short, the present invention includes multiple partition plates fixed around the upper mold core, a narrow space formed between the upper mold core and the partition plate, and between the lower mold cavity surface and the partition plate, The material is injected into a mold and cured by reaction, forming ribs on the side walls of the box and forming a hollow double-walled box. The lower part of the box body is also formed into a hollow double wall.
以下、こρ発明の一実施例を第１図乃至第２図によって
説明する。読図は、この発明を実施するための金型であ
って、第１図は上型と下型とが型締めされた状態を示す
縦断面図、第２図は、第１図のα−α″断面図である。Hereinafter, one embodiment of this invention will be described with reference to FIGS. 1 and 2. The drawings show a mold for carrying out the present invention, FIG. 1 is a vertical cross-sectional view showing a state in which the upper mold and lower mold are clamped, and FIG. "It is a sectional view.
寸ず、この装置の構成全簡単に説明する。上型２は固定
ピン２３＋Ｃよって上型取付は板１［。The entire configuration of this device will now be briefly explained. The upper mold 2 is attached to the plate 1 by the fixing pin 23+C.
また、該上型取付は板１は型締機の可動盤（図示せず）
に、さらに突出しビン４は突出し板３にそれぞれ固定さ
れている。該突出し板３と突出しビン４とは油圧シリン
ダ（図示せず）により上下運動が可能である。複数個の
仕切板５は押え板２４によって上記上型２に固定されて
いる。In addition, for mounting the upper mold, plate 1 is a movable plate of the mold clamping machine (not shown).
Furthermore, the protruding bottles 4 are each fixed to the protruding plate 3. The protruding plate 3 and the protruding bottle 4 can be moved up and down by a hydraulic cylinder (not shown). The plurality of partition plates 5 are fixed to the upper mold 2 by presser plates 24.
上型コア部６の側面と上記仕切板５との間に空間部２６
が形成され、また、上記上型２と下型２５がパーティン
グ面１２ヲ介して型締めされた状態では仕切板５と下型
キャピテイ側面２７との間に空間部７が形成される。上
記下型２５は下型取付は部２２によって型締機固足盤（
図示せず）に取付けられている。A space 26 is provided between the side surface of the upper mold core portion 6 and the partition plate 5.
is formed, and when the upper mold 2 and lower mold 25 are clamped together via the parting surface 12, a space 7 is formed between the partition plate 5 and the lower mold cavity side surface 27. The lower mold 25 is attached to the mold clamping machine by means of the part 22.
(not shown).
つぎに方法を説明する。上型２と下型２５が型締めされ
た後、ミキシングヘッド８の材料注入口９から硬質ポリ
ウレタンの材料（液体〕がランナ１０ｉ通ってゲート１
３から上記型内に注入される。上記材料は上記型内の空
間部７．１１．２６および上記相隣る仕切板５の境界部
２８ヲ充填して反応硬化する。硬化後、型を開き、突出
しピン４によって成形品を突出させる。Next, the method will be explained. After the upper mold 2 and lower mold 25 are clamped, the hard polyurethane material (liquid) passes through the runner 10i from the material injection port 9 of the mixing head 8 and enters the gate 1.
3 into the mold. The material fills the spaces 7, 11, 26 in the mold and the boundaries 28 of the adjacent partition plates 5 and is cured by reaction. After curing, the mold is opened and the molded product is ejected using ejector pins 4.
第３図は、上記方法によって成形した箱体底部に後述の
リブ付底板１９を固定した状態の斜視図を示し、第４図
は、第３図のｈ−ｈ″断面図である。第３図に示すよう
に仕切板５が固定された部分は空間部１７になシ、上記
相隣る仕切板５の境界部２８はリブ１８が形成され、中
空二重壁箱体１４の補強の役目をする。さらに上型コア
部６の側面と仕切板５によって中空二重壁箱体１４の薄
肉の箱体内壁１６が形成され、また上記下型キャビティ
側面２７と上記仕切板５によって薄肉の箱体外壁１５が
形成される。上記中空二重壁箱体１４の底部２１には、
別工程によって通常の反応射出成形方法によシ成形した
リブ付底板１９が固定される。図示の２０は補強用のリ
ブを示す。このリブ２０は従来技術の反応射出成形方法
によって容易に成形できる。リブ付き底板１９ヲ・上記
成形品の底部に固定することによって、中空二重壁箱体
１４の底部にも空間部が形成される。このようにして該
箱体１４の側面および底面はすべて薄肉で成形された中
空二重壁によって形成される。FIG. 3 shows a perspective view of a ribbed bottom plate 19, which will be described later, fixed to the bottom of the box formed by the above method, and FIG. 4 is a sectional view taken along line hh'' in FIG. 3. As shown in the figure, there is no space 17 in the part where the partition plate 5 is fixed, and a rib 18 is formed in the boundary part 28 between the adjacent partition plates 5, which serves to reinforce the hollow double-walled box body 14. Further, the side surface of the upper mold core part 6 and the partition plate 5 form a thin inner box wall 16 of the hollow double-walled box body 14, and the lower mold cavity side surface 27 and the partition plate 5 form a thin box inner wall 16. An outer body wall 15 is formed.The bottom portion 21 of the hollow double-walled box body 14 includes:
A ribbed bottom plate 19 molded by a normal reaction injection molding method is fixed in a separate step. Reference numeral 20 in the drawing indicates a reinforcing rib. The ribs 20 can be easily molded by conventional reaction injection molding methods. By fixing the ribbed bottom plate 19 to the bottom of the molded product, a space is also formed at the bottom of the hollow double-walled box 14. In this way, the side and bottom surfaces of the box body 14 are all formed by thin hollow double walls.
上記のように構成することによ＃）％上記の材料の使用
量を従来より大幅に少なくすることができ、また、薄肉
化によって型内での材料の硬化時間を従来より大幅に短
縮することができる。By configuring as above, the amount of the above material used can be significantly reduced compared to the conventional method, and by making the wall thinner, the curing time of the material in the mold can be significantly shortened compared to the conventional method. I can do it.
これらの関係全第５図および第６図に示す。第５図は、
成形品密度と重量（材料使用量）との関係全示すもので
、例えば成形品密度０．３ ｆ／ＪＩ’ｉ従来の成形方
法によった場合には、上記重量が２３００８’であった
のに対し、この発明の方法によれば、成形品密度を０．
５ｆ／ａｌに高めても上記重量は１０００ｆであって、
従来の場合の１／２以下である。第６図は、成形品密度
と型内における材料の硬化時間との関係を示すもので、
例えば成型品密度０．３ｆ／ｍの場合の従来の方法によ
る硬化時間が約１７分であるのに対し、この発明によれ
ば成形品密度ｆ ０．５ｆ／；Ｊに高めても硬化時間は
約３分であって、従来の場合の１１５以下である。All these relationships are shown in FIGS. 5 and 6. Figure 5 shows
This shows the relationship between the density of the molded product and the weight (amount of material used).For example, if the density of the molded product is 0.3 f/JI'i, the above weight would be 23008' when using the conventional molding method. On the other hand, according to the method of the present invention, the density of the molded product can be reduced to 0.
Even if it is increased to 5f/al, the above weight is 1000f,
This is less than 1/2 of the conventional case. Figure 6 shows the relationship between the density of the molded product and the curing time of the material in the mold.
For example, when the molded product density is 0.3 f/m, the curing time according to the conventional method is about 17 minutes, but according to the present invention, even if the molded product density is increased to f 0.5 f/; This is about 3 minutes, which is less than 115 minutes in the conventional case.
以上説明したように、この発明によれば、中空二重壁箱
体の生産性を高め、衝撃強度を向上することができると
旨う効果が得られる。As explained above, according to the present invention, the productivity of the hollow double-walled box can be increased and the impact strength can be improved.
第１図は、この発明の上型と下型とが型締めされた状態
を示す縦断面図、第２図は、第１図のα−α′断面図、
第３図は、中空二重壁箱体の完成品の斜視図、第４図は
、第３図のＡ −ｈ’断面図、第５図は、この発明の材
料使用量の低減効果を示すグラフ、第６図は、型内にお
ける材料の硬化時間の短縮効果を示すグラフである。
符号の説明
１・・・上型取旬は板 ２・・・上型
３・・・突出し板 ４・・・突出しピン５・・・仕切板
６・・・上型コア部
７、１１．１７．２６・・・空間部 ８・・・ミキシン
グへ；ド９・・・材料注入口 １０・・・ランナ１６・
・・ゲート１４・・・中空二重壁箱体１５・・・箱体の
外壁 １６・・・箱体の内壁１８．２０・・・リブ １
９・・・リブ付底板２１・・・箱体の底部 ２２・・・
下型取付は部２５・・・固定ビン ２４・・・押え板２
５・・・下型
２７・・・下型キャビティ側面
２８・・・境界部
代理人弁理士 高 橋 明 夫
１ １ 図 ＼
手続補正書（方式）
事件の表示
昭和５８ 年特許願第 １６８１４４ 号発明。名称
中空二重壁箱体の成形方法補正をする者
１１件との関係 特許出願人
名 称 〆５１０身゛（式会月 日 立 製 作 所代
理 人
補正の内容 別−のとおり
第 ２ 図FIG. 1 is a longitudinal cross-sectional view showing a state in which the upper mold and lower mold of the present invention are clamped together; FIG. 2 is a cross-sectional view taken along α-α′ in FIG. 1;
Fig. 3 is a perspective view of a completed hollow double-walled box, Fig. 4 is a sectional view taken along line A-h' in Fig. 3, and Fig. 5 shows the effect of reducing the amount of material used in this invention. The graph, FIG. 6, is a graph showing the effect of shortening the hardening time of the material in the mold. Explanation of symbols 1...Upper mold insertion plate 2...Upper die 3...Protruding plate 4...Ejecting pin 5...Partition plate 6...Upper mold core portion 7, 11.17 .26... Space 8... To mixing; Do 9... Material injection port 10... Runner 16.
...Gate 14...Hollow double-walled box body 15...Outer wall of the box body 16...Inner wall of the box body 18.20...Rib 1
9...Ribbed bottom plate 21...Bottom of the box 22...
Lower mold installation part 25...fixing bin 24...pressing plate 2
5... Lower mold 27... Lower mold cavity side surface 28... Akio Takahashi, patent attorney representing the boundary division 1 1 Figure \ Procedural amendment (method) Indication of case 1982 Patent application No. 168144 Invention . name
Relationship with 11 cases of amendments to the forming method of hollow double-walled boxes Name of patent applicant Name of the applicant
Claims (1)
個の仕切板によって上型コア面と上記仕切板との間に狭
い空間部を形成し、かつ、上型コア部を下型キャビティ
部に型締めしたときに、上記仕切板と下型キャビテイ面
との間に狭い空間部を形成させるとともに、上記コア部
の周囲に固定した上記複数個の相隣る仕切板の間に隙間
を設け、上記型内に硬質発泡樹脂を注入して、上記各空
間部および上記仕切板の隙間に硬質発泡樹脂が充填され
、反応を生じて硬化し二重壁およびリブを形成後、型を
外して箱体の側壁を成形させることを特徴とする中空二
重壁箱体の成形方法。When molding a box, a narrow space is formed between the upper mold core surface and the partition plates by a plurality of partition plates fixed around the upper mold core, and the upper mold core is connected to the lower mold cavity. When the mold is clamped to the core part, a narrow space is formed between the partition plate and the lower mold cavity surface, and a gap is provided between the plurality of adjacent partition plates fixed around the core part, A hard foamed resin is injected into the above mold, and the hard foamed resin is filled into each of the spaces and the gaps between the partition plates, and after a reaction occurs and hardens to form double walls and ribs, the mold is removed and the box is boxed. A method for forming a hollow double-walled box body, characterized by forming the side walls of the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58168144A JPS6061218A (en) | 1983-09-14 | 1983-09-14 | Molding process of hollow double wall box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58168144A JPS6061218A (en) | 1983-09-14 | 1983-09-14 | Molding process of hollow double wall box |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6061218A true JPS6061218A (en) | 1985-04-09 |
| JPH0322808B2 JPH0322808B2 (en) | 1991-03-27 |
Family
ID=15862641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58168144A Granted JPS6061218A (en) | 1983-09-14 | 1983-09-14 | Molding process of hollow double wall box |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6061218A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003037594A1 (en) * | 2001-10-29 | 2003-05-08 | Bridgestone Corporation | Rigid polyurethane foam product formed using mold |
| JP2005064372A (en) * | 2003-08-19 | 2005-03-10 | Toyota Motor Corp | Case, electric equipment unit using it and automobile with electric equipment unit |
-
1983
- 1983-09-14 JP JP58168144A patent/JPS6061218A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003037594A1 (en) * | 2001-10-29 | 2003-05-08 | Bridgestone Corporation | Rigid polyurethane foam product formed using mold |
| JP2005064372A (en) * | 2003-08-19 | 2005-03-10 | Toyota Motor Corp | Case, electric equipment unit using it and automobile with electric equipment unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0322808B2 (en) | 1991-03-27 |
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