JPS6168212A - Vacuum reactive injection molding machine - Google Patents
Vacuum reactive injection molding machineInfo
- Publication number
- JPS6168212A JPS6168212A JP19088884A JP19088884A JPS6168212A JP S6168212 A JPS6168212 A JP S6168212A JP 19088884 A JP19088884 A JP 19088884A JP 19088884 A JP19088884 A JP 19088884A JP S6168212 A JPS6168212 A JP S6168212A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- mold
- molding
- vacuum
- 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.)
- Pending
Links
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、真空引き反応射出成形装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum reaction injection molding apparatus.
自動車に装備されているウレタンバンパ等を成形するた
めの反応射出成形(RIM)においては、成形品の形状
が複雑であったり、あるいは大型化すると成形不良が発
生しやすく、生産性が低下した。In reaction injection molding (RIM) for molding urethane bumpers and the like that are installed in automobiles, when the shape of the molded product is complex or the size of the molded product increases, molding defects tend to occur, resulting in a decrease in productivity.
前記成形不良として多いのは、例えば、キャビティ内の
成形原料の流れが乱れて型内エアの滞留する部位が生じ
、この型内エアがキャビティ内の成形原料中に袖留して
成形品にエア溜りを形成するものがある。The most common molding defects are, for example, when the flow of the molding raw material in the cavity is disrupted, creating areas where air in the mold stagnates, and this mold air is trapped in the molding raw material in the cavity, causing air to flow into the molded product. There are things that form pools.
このエア溜りの発生をなくする方策としては、本出願人
が出願した特願昭58−113947号「射出成形装置
」 (未公開)がある。As a measure to eliminate the occurrence of air pockets, there is Japanese Patent Application No. 113947/1983 filed by the present applicant entitled "Injection Molding Apparatus" (unpublished).
この発明は、第4図に示す如く、射出成形型1.2の分
割面5に型閉状態でキャビティ3と外気とを遮断するシ
ール部材4を設け、開閉パルプ12を前記射出成形型1
.2の内面に形成された凹所内に設け、該開閉バルブ1
2に排気通路13を介して接続する真空引き装置14を
前記射出成形型1.2の外部に配設したことを特徴とす
る射出成形装置であって、キャビティ3内を真空引きし
た状態にして反応射出成形できるようにしたものである
。As shown in FIG. 4, this invention provides a sealing member 4 on the dividing surface 5 of the injection mold 1.2 to shut off the cavity 3 from the outside air in the mold closed state.
.. The opening/closing valve 1 is provided in a recess formed on the inner surface of the opening/closing valve 1.
This injection molding apparatus is characterized in that a vacuum device 14 connected to the injection mold 1.2 through an exhaust passage 13 is disposed outside the injection mold 1.2, and the inside of the cavity 3 is evacuated. It is designed to be reaction injection molded.
C発明が解決しようとする問題点〕
しかしながら、この射出成形装置においては、キャビテ
ィ3内のエアが真空引き装置14に吸引され、完全に除
去されて開閉バルブ12が閉の状態とされた後、キャビ
ティ3の末端部に成形原料が充填されるまでの間、キャ
ビティ3の末端部を完全な真空度に保つことが難しいと
いう欠点を有している。C Problems to be Solved by the Invention] However, in this injection molding apparatus, after the air in the cavity 3 is sucked into the vacuum device 14 and completely removed, and the on-off valve 12 is closed, The disadvantage is that it is difficult to maintain a complete vacuum at the end of the cavity 3 until the end of the cavity 3 is filled with the molding material.
この欠点を解消する手段として、開閉バルブ12の閉じ
タイミングをタイマ操作により成形原料注入開始後の最
適時間経過後に閉じるようにすること、すなわち、成形
原料がキャビティ3の末端部に到達する時点において開
閉バルブ12を閉じるようにする提案もあるが、開閉バ
ルブ12の閉じタイミングの狂いによって成形原料が開
閉バルブI2に侵入した場合に、開閉バルブ12は、使
用不能になるなどの不都合があった。As a means to eliminate this drawback, the closing timing of the on-off valve 12 is controlled by a timer so that it is closed after an optimum time has elapsed after the start of injection of the molding material, that is, it is opened and closed at the time when the molding material reaches the end of the cavity 3. Although there is a proposal to close the valve 12, there is a problem that if the molding material enters the opening/closing valve I2 due to an error in the closing timing of the opening/closing valve 12, the opening/closing valve 12 becomes unusable.
本発明は、これらの欠点に鑑みてなされたものであって
、前記開閉バルブを廃すとともに、成形原料がキャビテ
ィの末端部に充填されるまで、キャビティの末端部を高
い真空度に維持できるようにすることを目的とする。The present invention has been made in view of these drawbacks, and it eliminates the on-off valve and maintains a high degree of vacuum at the end of the cavity until the end of the cavity is filled with molding raw material. The purpose is to
そのために、本発明は、射出成形型の分割面に、型閉状
態でキャビティと外気とを遮断するシール部材を設け、
このシール部材によりキャビティとともに外気と遮断さ
れる分割面であって、かつ、キャビティの末端部に隣接
する分割面に、キャビティと連通させて成形原料の逃が
し部を形成し、さらに、この逃がし部に排気通路を介し
て前記射出成形型の外部に配設させた真空引き装置を接
続したものである。To this end, the present invention provides a sealing member on the dividing surface of the injection mold to isolate the cavity from the outside air when the mold is closed.
A parting surface that is shut off from the outside air together with the cavity by this sealing member, and which is adjacent to the end of the cavity, is connected to the cavity to form a release part for the molding raw material, and further, in this part, A vacuum device disposed outside the injection mold is connected through an exhaust passage.
以下、本発明の実施例を図面に基づいて説明する。 Embodiments of the present invention will be described below based on the drawings.
反応射出成形は、高圧衝突混合射出成形機(不図示)に
より、2種以上の高反応性の成形原料(液体)を混合し
て、成形型内へ射出し、急速な高分子化反応をへて成形
品を得るもので、第1図に示す反応射出成形型は、固定
型となる下型lであって、この下型1の型上面中央部に
は、上方に開放する凹状の成形面が形成され、その成形
面の外周縁に上型2との分割面5a、5bが形成されて
いる。Reaction injection molding involves mixing two or more types of highly reactive molding raw materials (liquids) using a high-pressure impingement mixing injection molding machine (not shown) and injecting the mixture into a mold to perform a rapid polymerization reaction. The reaction injection mold shown in FIG. 1 has a lower mold 1 which is a fixed mold, and a concave molding surface that opens upward in the center of the upper surface of the lower mold 1. is formed, and dividing surfaces 5a and 5b from the upper mold 2 are formed on the outer peripheral edge of the molding surface.
第2図は、この下型1に可動型である上型2を金型させ
た型閉状態を示しており、前詰下型1の成形面と上型2
の成形面によってキャビティ3が形成される。FIG. 2 shows the mold closed state in which the movable upper mold 2 is mounted on the lower mold 1, and the molding surface of the front filling lower mold 1 and the upper mold 2
A cavity 3 is formed by the molding surface.
前記下型1の分割面5a、5bには、型閉状態において
キャビティ3と外気とを遮断するシール部材4が設けら
れている。Seal members 4 are provided on the dividing surfaces 5a and 5b of the lower mold 1 to isolate the cavity 3 from outside air in the mold closed state.
このシール部材4は、ゴム、軟質合成樹脂などの弾性材
からなり、下型1の分割面5a、5bに設けた蟻状の溝
部に嵌合されていて、型閉時には、このシール部材4に
上型の分割面5Cが圧接されてシールがなされる。This sealing member 4 is made of an elastic material such as rubber or soft synthetic resin, and is fitted into dovetail-shaped grooves provided on the dividing surfaces 5a and 5b of the lower mold 1. When the mold is closed, this sealing member 4 The dividing surface 5C of the upper die is pressed against the upper die to form a seal.
6は、成形原料をキャビティ3内に射出する入口(以下
、ゲートと称する。)を示しており、このゲート6から
最も遠いキャビティ3の末端部に隣接する分割面5bは
、他の分割面5aよりも面積が広大されていて、この拡
大させた分割面5bは、シール部材4によりキャビティ
3とともに囲われ、キャビティ3とともに外気と遮断さ
れている。Reference numeral 6 indicates an inlet (hereinafter referred to as a gate) for injecting the molding raw material into the cavity 3, and the dividing surface 5b adjacent to the end of the cavity 3 furthest from the gate 6 is different from the other dividing surface 5a. The enlarged dividing surface 5b is surrounded by the sealing member 4 together with the cavity 3, and the cavity 3 and the cavity 3 are isolated from the outside air.
この分割面5bには、連通溝7を通じてキャビティ3と
連通させた成形原料の第1の逃がし部8aが形成され、
この第1の逃がし部8aに絞り溝9a、9bを介して第
2の逃がし部8bおよび第3の逃がし部8Cがジグザグ
状に連続させて形成されている。A first relief part 8a for the molding raw material communicated with the cavity 3 through the communication groove 7 is formed on this dividing surface 5b,
A second relief portion 8b and a third relief portion 8C are continuously formed in a zigzag shape in the first relief portion 8a via throttle grooves 9a and 9b.
第3の逃がし部8Cは、上型2の分割面5Cをも窪ませ
て容積を増加さ廿、成形原料を受容できる容量の増大を
図っている。The third relief portion 8C is designed to increase the volume by recessing the dividing surface 5C of the upper mold 2, thereby increasing the capacity for receiving the molding raw material.
さらに、この第3の逃がし部8Cからは、型外に向けて
通孔lOが下型lと上型2の分割面5b、5Cに形成さ
れていて、型外部に配設した真空引き装置(不図示)が
、この通孔10に接続された配管11を介して前記第3
の逃がし部8Cに接続されている。Furthermore, a through hole 1O is formed in the dividing surfaces 5b and 5C of the lower mold 1 and the upper mold 2 from this third relief part 8C toward the outside of the mold, and a vacuum device ( (not shown) is connected to the third
It is connected to the relief part 8C.
この配管11により、排気通路が構成される。This piping 11 constitutes an exhaust passage.
また、図示を省略したが、真空引き装置は、真空ポンプ
と真空タンクとから構成されており、真空タンクは、真
空ポンプにより常時所定の真空状態に保たれている。Although not shown, the vacuum evacuation device is composed of a vacuum pump and a vacuum tank, and the vacuum tank is always maintained at a predetermined vacuum state by the vacuum pump.
次に、上記構成からなる反応射出成形装置の作用を述べ
る。Next, the operation of the reaction injection molding apparatus having the above configuration will be described.
まず、下型lに対して上型2を金型して型締めし、シー
ル部材4によりキャビティ3および第1ないし第3の成
形原料の逃がし部8a、3b、3cを外気と遮断する。First, the upper mold 2 is molded into the lower mold l and the mold is clamped, and the cavity 3 and the first to third molding raw material escape portions 8a, 3b, 3c are isolated from the outside air by the sealing member 4.
しかる後に、キャビティ3と真空タンクを連通させてキ
ャビティ3内のエアを真空状態の真空タンク内に吸引し
て完全に除去する。Thereafter, the cavity 3 and the vacuum tank are brought into communication, and the air in the cavity 3 is sucked into the vacuum tank in a vacuum state and completely removed.
キャビティ3と真空タンクを連通させた状態において、
成形原料をキャビティ3中に注入開始する。In a state where cavity 3 and the vacuum tank are in communication,
Injection of the molding raw material into the cavity 3 is started.
成形原料がキャビティ3の末端部に到達し、第1の逃が
し部8aに流入するまで、キャビティ3内は、高い真空
度が維持される。A high degree of vacuum is maintained in the cavity 3 until the molding raw material reaches the end of the cavity 3 and flows into the first relief part 8a.
第1の逃がし部8aに流入した成形原料は、高分子化反
応の進行によって増粘して流動抵抗が増すことと1.絞
り溝9a、9bにおける流動抵抗により流れが弱まり、
第1ないし第3の逃がし部8a、8b、8Cのいずれか
の内部において硬化する。The molding raw material that has flowed into the first relief part 8a becomes thicker due to the progress of the polymerization reaction, and the flow resistance increases.1. The flow is weakened by the flow resistance in the throttle grooves 9a and 9b,
It hardens inside any one of the first to third relief parts 8a, 8b, and 8C.
このように成形された成形品には、エア溜りなどの成形
不良を生ずることはない。The molded product molded in this manner does not suffer from molding defects such as air pockets.
本発明によれば、キャビティの末端部に隣接する分割面
に、成形原料の逃がし部を形成し、この逃がし部に排気
通路を介して真空引き装置を接続したので、開閉バルブ
を廃すことができるとともに、成形原料がキャビティの
末端部に充填されるまで、キャビティの末端部を高い真
空度に維持させることが可能になり、キャビティの末端
部における型内エアの滞留を完全に防止することができ
、エア溜りによる成形不良のない成形品を得ることがで
きる。According to the present invention, a relief part for the molding material is formed in the dividing surface adjacent to the end of the cavity, and a vacuum device is connected to this relief part through an exhaust passage, so that an on-off valve can be eliminated. At the same time, it is possible to maintain a high degree of vacuum at the end of the cavity until the molding material is filled into the end of the cavity, completely preventing air from stagnation in the mold at the end of the cavity. It is possible to obtain molded products without molding defects due to air pockets.
第1図は、本発明に係る真空引き反応射出成形装置の実
施例を示す一部切欠き斜視図、第2図は、第1図のn−
m線相当部分の断面図、第3図は、第1図のm−m線相
当部分の断面図、 6第4図は、本出願人がすでに出願
している発明の一実施例を示す模式図である。
1・−−−−一下型
2−一一一一一上型
3−−−−−−キャビティ
4・−・−シール部材
5a・・−−−一下型の分割面
5b・−一一一一下型の分割面(キャビティの末端部に
隣接する分割面)
5c・−・−上型の分割面
6・−・−・ゲート
7−・・・連通溝
8a・−・−第1の逃がし部
8b・−・・−第2の逃がし部
8c・−一−−−第3の逃がし部
9a、9b・−一一−−絞り溝
第1図
ソロ、9D−Jシヒブ局4
第2図
第3図
第4図FIG. 1 is a partially cutaway perspective view showing an embodiment of the vacuum reaction injection molding apparatus according to the present invention, and FIG.
FIG. 3 is a cross-sectional view of a portion corresponding to the m-line in FIG. It is a diagram. 1.----Lower mold 2-1111 Upper mold 3----Cavity 4---Seal member 5a---Divided surface 5b of lower mold.--1111 Dividing surface of lower mold (dividing surface adjacent to the end of the cavity) 5c --- Dividing surface 6 of upper mold --- Gate 7 --- Communication groove 8a --- First relief part 8b...-Second relief portion 8c.--1---Third relief portion 9a, 9b.--11--Aperture groove Fig. 1 Solo, 9D-J Shihib station 4 Fig. 2 Fig. 3 Figure 4
Claims (1)
外気とを遮断するシール部材を設け、このシール部材に
よりキャビティとともに外気と遮断される分割面であっ
て、かつ、キャビティの末端部に隣接する分割面に、キ
ャビティと連通させて成形原料の逃がし部を形成し、さ
らに、この逃がし部に排気通路を介して前記射出成形型
の外部に配設させた真空引き装置を接続したことを特徴
とする真空引き反応射出成形装置。(1) A sealing member is provided on the dividing surface of the injection mold to isolate the cavity from the outside air when the mold is closed, and the dividing surface is shut off from the outside air together with the cavity by this sealing member, and the end portion of the cavity is A molding raw material relief part is formed in the divided surface adjacent to the mold by communicating with the cavity, and further, a vacuum pulling device disposed outside the injection mold is connected to this relief part via an exhaust passage. Vacuum reaction injection molding equipment featuring:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19088884A JPS6168212A (en) | 1984-09-12 | 1984-09-12 | Vacuum reactive injection molding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19088884A JPS6168212A (en) | 1984-09-12 | 1984-09-12 | Vacuum reactive injection molding machine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6168212A true JPS6168212A (en) | 1986-04-08 |
Family
ID=16265409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19088884A Pending JPS6168212A (en) | 1984-09-12 | 1984-09-12 | Vacuum reactive injection molding machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6168212A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0336425U (en) * | 1989-08-10 | 1991-04-09 |
-
1984
- 1984-09-12 JP JP19088884A patent/JPS6168212A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0336425U (en) * | 1989-08-10 | 1991-04-09 |
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