JPH0322808B2 - - Google Patents
Info
- Publication number
- JPH0322808B2 JPH0322808B2 JP58168144A JP16814483A JPH0322808B2 JP H0322808 B2 JPH0322808 B2 JP H0322808B2 JP 58168144 A JP58168144 A JP 58168144A JP 16814483 A JP16814483 A JP 16814483A JP H0322808 B2 JPH0322808 B2 JP H0322808B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- partition plates
- upper mold
- box
- hollow double
- 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
- 238000005192 partition Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000000463 material Substances 0.000 description 13
- 239000000047 product Substances 0.000 description 11
- 238000010107 reaction injection moulding Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 4
- 229920002635 polyurethane Polymers 0.000 description 4
- 239000004814 polyurethane Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000012265 solid product Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 239000012792 core layer Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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)
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る厚肉
箱体の成形方法によれば、成形品の表層部が硬質
のスキン層で形成され、内部は軟質のコア層から
なるサンドイツ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200×300×300mm、厚
さ25mm、成形品密度0.3ｇ／cmの箱体を成形する
のに約2300ｇ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分もかかつた。
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
mmであるが、この厚さでは衝撃強度が弱いという
欠点があつた。
Boxes made by reaction injection molding of hard foamed resin, such as hard polyurethane, are used for computer terminal housings, car refrigerator boxes, etc., but conventional thick boxes made by reaction injection molding of hard polyurethane are used. According to the molding method described above, a solid product with a sandwich structure was formed, in which the surface layer of the molded product was formed of a hard skin layer and the inside 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.
In addition, a large amount of material is used; for example, as shown in Figure 5 below, it takes approximately It required 2300g of material. 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 thickness of the hard surface layer of this molded product is at most 1.5 to 2.0 mm.
mm, but this thickness had the disadvantage of low impact strength.
この発明の目的は、上記した従来技術の欠点を
なくして、生産性を高め、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, increase productivity, and improve impact strength. .
要するにこの発明は、上型コア部の周囲に固定
した複数個の仕切板により、上記上型コア部と仕
切板および下型キヤ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り、また箱体の底部は
別に成形したリブ付き底板を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, this invention uses a plurality of partition plates fixed around the upper die core to form narrow spaces between the upper die core and the partition plates, and between the lower die cavity surface and the partition plates, thereby allowing the material to be removed. After being injected into a mold, it is cured by reaction, and ribs are formed on the side walls of the box to form a hollow double-walled box.The bottom of the box is fixed with a separately molded ribbed bottom plate to form the box. The lower part of the body is also formed into a hollow double wall.
以下、この発明の一実施例を第１図乃至第２図
によつて説明する。該図は、この発明を実施する
ための金型であつて、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ａ−a′断面図である。
An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. This figure shows a mold for carrying out the present invention, in which FIG. 1 is a vertical sectional view showing a state in which the upper mold and the lower mold are clamped, and FIG.
It is a sectional view taken along the line aa' in the figure.
まず、この装置の構成を簡単に説明する。上型
２は固定ピン２３によつて上型取付け板１に、ま
た、該上型取付け板１は型締機の可動盤（図示せ
ず）に、さらに突出しピン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と突出しピン
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
よつて上記上型２に固定されている。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がパーテイ
ング面１２を介して型締せされた状態では仕切板
５と下型キヤビテイ側面２７との間に空間部７が
形成される。上記下型２５は下型取付け部２２に
よつて型締機固定盤（図示せず）に取付けられて
いる。 First, the configuration of this device will be briefly explained. The upper mold 2 is fixed to the upper mold mounting plate 1 by fixing pins 23, the upper mold mounting plate 1 is fixed to the movable platen of the mold clamping machine (not shown), and the ejecting pin 4 is fixed to the ejecting plate 3. has been done. The projecting plate 3 and the projecting pin 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. A space 26 is formed between the side surface of the upper mold core part 6 and the partition plate 5, and when the upper mold 2 and the lower mold 25 are clamped together via the parting surface 12, the partition plate 5 A space 7 is formed between the lower mold cavity side surface 27 and the lower mold cavity side surface 27. The lower die 25 is attached to a mold clamping machine fixing plate (not shown) by a lower die attachment part 22.
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、ミキシングヘツド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
１０を通つてゲート１３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を充填し
て反応硬化する。硬化後、型を開き、突出しピン
４によつて成形品を突出させる。 Next, the method will be explained. After the upper mold 2 and the lower mold 25 are clamped, hard polyurethane material (liquid) is injected into the mold from the material injection port 9 of the mixing head 8 through the runner 10 and the gate 13. The above material is the space part 7, 11, 26 in the above mold.
Then, the boundary portions 28 of the adjacent partition plates 5 are filled and cured by reaction. After curing, the mold is opened and the molded product is ejected using ejector pins 4.
第３図は、上記方法によつ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
を示す、第４図は、第３図のｂ−b′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になり、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によつて中空二重壁箱体１４の薄
肉の箱体内壁１６が形成され、また上記下型キヤ
ビテイ側面２７と上記仕切板５によつて薄肉の箱
体外壁１５が形成される。上記中空二重壁箱体１
４の底部２１には、別工程によつて通常の反応射
出成形方法により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つて
容易に成形できる。リブ付き底板１９を上記成形
品の底部に固定することによつて、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つて成形される。 FIG. 3 is 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 bb' in FIG. As shown in FIG. 3, the part where the partition plates 5 are fixed becomes a space 17, and the boundary part 28 between the adjacent partition plates 5 is formed with a rib 18, which serves as a reinforcement for the hollow double-walled box body 14. play a role. Furthermore, the side surface of the upper die core section 6 and the partition plate 5 form a thin inner wall 16 of the hollow double-walled box body 14, and the side surface 27 of the lower die cavity and the partition plate 5 form a thin inner wall 16 of the hollow double-walled box body 14. A box outer wall 15 is formed. The above hollow double-walled box 1
A ribbed bottom plate 19 is fixed to the bottom part 21 of 4, which is formed by a normal reaction injection molding method in a separate process. Reference numeral 20 in the figure indicates a reinforcing rib. The ribs 20 can be easily molded using 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り、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、薄肉化によつ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。これ
らの関係を第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）との関係を
示すもので、例えば成形品密度0.3ｇ／cm3を従来
の成形方法によつた場合には、上記重量が2300ｇ
であつたのに対し、この発明の方法によれば、成
形品密度を0.5ｇ／cm3に高めても上記重量は1000
ｇであつて、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0.3
ｇ／cm3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
を0.5ｇ／cm3に高めても硬化時間は約３分であつ
て、従来の場合の1/5以下である。 By configuring as described above, the amount of the above-mentioned materials used can be significantly reduced compared to conventional methods, and by making the walls thinner, the curing time of the materials in the mold can be significantly shortened compared to conventional methods. can. These relationships are shown in FIGS. 5 and 6. Figure 5 shows the relationship between the density of the molded product and the weight (amount of material used). For example, when the density of the molded product is 0.3 g/cm 3 using the conventional molding method, the weight is 2300 g.
However, according to the method of the present invention, even if the density of the molded product is increased to 0.5 g/cm 3 , the above weight remains at 1000
g, which is less than 1/2 that of the conventional case. 6th
The figure shows the relationship between the density of the molded product and the curing time of the material in the mold.For example, the density of the molded product is 0.3.
curing time by conventional method for g/ cm3 is approx. 17
In contrast, according to the present invention, even if the density of the molded product is increased to 0.5 g/cm 3 , the curing time is about 3 minutes, which is less than 1/5 of the conventional case.
さらに、注入樹脂の反応硬化時に金型に接する
すべての面、例えば上型コア面と仕切板面及び下
型キヤビテイ面と仕切板面には高密度のスキン層
が生成されるため衝撃強度が向上する。 Furthermore, when the injected resin reacts and hardens, a high-density skin layer is generated on all surfaces that come into contact with the mold, such as the upper mold core surface and partition plate surface, and the lower mold cavity surface and partition plate surface, improving impact strength. do.
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
ことができるという効果が得られる。
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ａ
−a′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ｂ−b′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……上型取付け板、２……上
型、３……突出し板、４……突出しピン、５……
仕切板、６……上型コア部、７，１１，１７，２
６……空間部、８……ミキシングヘツド、９……
材料注入口、１０……ランナ、１３……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、１９
……リブ付底板、２１……箱体の底部、２２……
下型取付け部、２３……固定ピン、２４……押え
板、２５……下型、２７……下型キヤビテイ側
面、２８……境界部。
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, and FIG. 2 is a of FIG. 1.
-a′ sectional view, FIG. 3 is a perspective view of the completed hollow double-walled box, FIG. 4 is a bb′ sectional view of FIG. 3, and FIG. Figure 6 is a graph showing the effect of reducing the amount of material in the mold. Explanation of symbols, 1...Upper die mounting plate, 2...Upper die, 3...Ejecting plate, 4...Ejecting pin, 5...
Partition plate, 6... Upper mold core part, 7, 11, 17, 2
6... Space section, 8... Mixing head, 9...
Material injection port, 10... runner, 13... gate,
14...Hollow double-walled box body, 15...Outer wall of the box body,
16... Inner wall of box body, 18, 20... Rib, 19
... Ribbed bottom plate, 21 ... Bottom of box, 22 ...
Lower die mounting portion, 23...fixing pin, 24...pressing plate, 25...lower die, 27...lower die cavity side surface, 28...border portion.
Claims (1)
定した複数個の仕切板によつ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
コア部を下型キヤビテイ部に型締めしたときに、
上記仕切板と下型キヤ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。1. When forming a box, a plurality of partition plates fixed around the upper mold core part form a narrow space between the upper mold core surface and the partition plates, and the upper mold core part When the mold is clamped to the lower mold cavity,
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, and a hard foamed resin is placed in the mold. The hard foamed resin is injected into each of the spaces and the gaps between the partition plates, and after it reacts and hardens to form double walls and ribs, the mold is removed to form the side walls of the box. Characteristic method for forming hollow double-walled boxes.
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 JPS6061218A (en) | 1985-04-09 |
| JPH0322808B2 true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2003037594A1 (en) * | 2001-10-29 | 2005-02-17 | 株式会社ブリヂストン | Rigid polyurethane foam mold products |
| 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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6061218A (en) | 1985-04-09 |
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