JPH0664024A - Molding apparatus for hollow molded body made of synthetic resin - Google Patents
Molding apparatus for hollow molded body made of synthetic resinInfo
- Publication number
- JPH0664024A JPH0664024A JP22551392A JP22551392A JPH0664024A JP H0664024 A JPH0664024 A JP H0664024A JP 22551392 A JP22551392 A JP 22551392A JP 22551392 A JP22551392 A JP 22551392A JP H0664024 A JPH0664024 A JP H0664024A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- cavity
- molten synthetic
- molding
- overflow
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1711—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は合成樹脂製中空成形体用
成形装置、特に、成形用キャビティ、その成形用キャビ
ティに連通するゲートおよび成形用キャビティに流出路
を介して連通するオーバフロー室を有する成形型と、ゲ
ートを通じて成形用キャビティに射出された溶融合成樹
脂に空洞部を形成すべく、その溶融合成樹脂内にガスを
吹込むガス吹込み機構とを備えた成形装置の改良に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for hollow moldings made of synthetic resin, and more particularly to a molding cavity, a gate communicating with the molding cavity, and an overflow chamber communicating with the molding cavity via an outflow passage. The present invention relates to an improvement of a molding apparatus provided with a molding die and a gas blowing mechanism that blows gas into the molten synthetic resin to form a cavity in the molten synthetic resin injected into a molding cavity through a gate.
【０００２】ここで中空成形体には、全体に亘って空洞
部が存するシェル状成形体の外に、一部に空洞部を有す
る成形体も包含される。[0002] Here, the hollow molded article includes a molded article having a hollow portion in addition to a shell-shaped molded article having a hollow portion throughout.
【０００３】[0003]
【従来の技術】従来、この種成形装置としては、オーバ
フロー室への流出路を常時開放状態にしたものが知られ
ている（例えば、特開平２−２１５５１６号公報参
照）。2. Description of the Related Art Heretofore, as this type of molding apparatus, there has been known a molding apparatus in which an outflow passage to an overflow chamber is always open (for example, see Japanese Patent Laid-Open No. 2-215516).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら従来装置
によると、キャビティに溶融合成樹脂を射出した際に、
その樹脂が流出路を通じてオーバフロー室へ流出するこ
とがあり、このような事態が発生すると、溶融合成樹脂
に射出圧が十分に作用しないため、中空成形体の表面性
が悪化し、またキャビティにおける樹脂量不足から中空
成形体にガスの吹抜けによる孔があいたり、肉厚の不均
一化を招く、といった問題を生じる。However, according to the conventional apparatus, when the molten synthetic resin is injected into the cavity,
The resin may flow out into the overflow chamber through the outflow passage, and when such a situation occurs, the injection pressure does not sufficiently act on the molten synthetic resin, which deteriorates the surface property of the hollow molded body, and also the resin in the cavity. Due to the lack of the amount, there arises a problem that holes are formed in the hollow molded article due to gas blow-out and the wall thickness becomes uneven.
【０００５】本発明は前記に鑑み、キャビティへの溶融
合成樹脂の射出時にはその樹脂のオーバフロー室への流
出を阻止して中空成形体の品質を向上させることがで
き、一方、ガス吹込み機構の作動中は過剰の溶融合成樹
脂のオーバフロー室への流出を助勢して中空成形加工を
スムーズに、且つ短時間で行うことができるようにした
前記成形装置を提供することを目的とする。In view of the above, the present invention can prevent the outflow of the molten synthetic resin into the overflow chamber at the time of injecting the molten synthetic resin into the cavity to improve the quality of the hollow molded body. It is an object of the present invention to provide the above-mentioned molding apparatus that assists the outflow of an excessive amount of molten synthetic resin into the overflow chamber during operation so that the hollow molding process can be performed smoothly and in a short time.
【０００６】また本発明は、中空成形体の肉厚を容易に
調節することができるようにした前記成形装置を提供す
ることを目的とする。It is another object of the present invention to provide the above-mentioned molding apparatus capable of easily adjusting the wall thickness of the hollow molded body.
【０００７】[0007]
【課題を解決するための手段】本発明は、成形用キャビ
ティ、その成形用キャビティに連通するゲートおよび前
記成形用キャビティに流出路を介して連通するオーバフ
ロー室を有する成形型と、前記ゲートを通じて前記成形
用キャビティに射出された溶融合成樹脂に空洞部を形成
すべく、その溶融合成樹脂内にガスを吹込むガス吹込み
機構とを備えた成形装置において、前記成形用キャビテ
ィに前記溶融合成樹脂が充填されるまでは前記流出路を
閉鎖し、また前記ガス吹込み機構の作動中は前記流出路
を開放すると共に前記オーバフロー室内を減圧するオー
バフロー助勢機構を備えていることを特徴とする。According to the present invention, there is provided a molding die having a molding cavity, a gate communicating with the molding cavity, and an overflow chamber communicating with the molding cavity through an outflow passage, and the molding die through the gate. In a molding apparatus including a gas blowing mechanism for blowing gas into the molten synthetic resin to form a cavity in the molten synthetic resin injected into the molding cavity, the molten synthetic resin is injected into the molding cavity. An overflow assisting mechanism that closes the outflow passage until it is filled, opens the outflow passage while the gas blowing mechanism is operating, and decompresses the overflow chamber is provided.
【０００８】また前記オーバフロー助勢機構は、前記オ
ーバフロー室に摺動自在に嵌合されたプランジャと、前
記成形用キャビティに前記溶融合成樹脂が充填されるま
では前記オーバフロー室を縮小して前記流出路を閉鎖す
べく前記プランジャを前進させ、また前記ガス吹込み機
構の作動中は前記流出路を開放すると共に前記オーバフ
ロー室を正規の容積まで拡大すべく前記プランジャを後
退させる駆動体と、前記プランジャの後退限を調節する
調節部材とを備えていることを特徴とする。The overflow assisting mechanism reduces the overflow chamber by shrinking the overflow chamber until the molding cavity is filled with the molten synthetic resin and the plunger slidably fitted in the overflow chamber. To move the plunger forward to close the valve, and to open the outflow passage during operation of the gas blowing mechanism and retract the plunger to expand the overflow chamber to a regular volume; An adjusting member for adjusting the backward limit is provided.
【０００９】[0009]
【実施例】図１において、成形型１は固定型２と可動型
３とよりなり、両型２，３によって、円筒状をなす成形
用キャビティ４、そのキャビティ４の一端に連通するゲ
ート５およびキャビティ４の他端に流出路６を介して連
通する円筒状オーバフロー室７が形成される。ゲート５
は図示しない射出ノズルに連通する。また流出路６の断
面積はキャビティ４の断面積よりも小さくなるように設
定される。ゲート５を通じて成形用キャビティ４に射出
された溶融合成樹脂に空洞部を形成すべく、その溶融合
成樹脂内に高圧ガスを吹込むガス吹込み機構８が可動型
３に設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a molding die 1 comprises a fixed die 2 and a movable die 3, and a molding cavity 4 having a cylindrical shape, a gate 5 communicating with one end of the cavity 4 and A cylindrical overflow chamber 7 communicating with the other end of the cavity 4 via the outflow passage 6 is formed. Gate 5
Communicates with an injection nozzle (not shown). The cross-sectional area of the outflow passage 6 is set to be smaller than the cross-sectional area of the cavity 4. The movable mold 3 is provided with a gas blowing mechanism 8 for blowing a high-pressure gas into the molten synthetic resin so as to form a cavity in the molten synthetic resin injected into the molding cavity 4 through the gate 5.
【００１０】そのガス吹込み機構８は次のように構成さ
れる。可動型３のゲート５近傍にガス用吹込み孔９が形
成され、その吹込み孔９を開閉する第１油圧シリンダ１
０が可動型３に付設される。第１油圧シリンダ１０のシ
リンダ本体１１は、吹込み孔９側より可動型３外部に向
って順次配列された小径孔ａ1 ，中径孔ａ2 および大径
孔ａ3 を有する。その大径孔ａ3 にピストン１２が摺動
自在に嵌合され、そのピストン１２により大径孔ａ3 内
は中径孔ａ2 側の第１油圧室１３とそれと反対側の第２
油圧室１４とに区画される。また小径孔ａ1 にピストン
１２と一体のピストンロッド１５が摺動自在に嵌合さ
れ、そのピストンロッド１５によって小径孔ａ1 内に、
吹込み孔９に連通するガス用流通室１６が形成される。
ピストンロッド１５先端に、それよりも小径のロッド状
弁体１７が一体に設けられ、その弁体１７は吹込み孔９
に挿脱される。中径孔ａ2 および大径孔ａ3 間の段部ｂ
は、ピストン１２のストッパとして機能し、ピストン１
２が段部ｂに衝合した状態では弁体１７が前進限に在っ
て吹込み孔９に挿入されるため、その吹込み孔９が閉鎖
される。The gas blowing mechanism 8 is constructed as follows. A gas injection hole 9 is formed near the gate 5 of the movable mold 3, and the first hydraulic cylinder 1 opens and closes the injection hole 9.
0 is attached to the movable die 3. The cylinder body 11 of the first hydraulic cylinder 10 has a small diameter hole a 1 , a medium diameter hole a 2 and a large diameter hole a 3 which are sequentially arranged from the blow hole 9 side toward the outside of the movable die 3. Its piston 12 to the large-diameter hole a 3 is slidably fitted in a first hydraulic chamber 13 of the large diameter hole a 3 in the medium diameter hole a 2 side by the piston 12 and its opposing second
It is divided into the hydraulic chamber 14. The piston 12 integral with the piston rod 15 is slidably fitted in the small diameter hole a 1, the small-diameter hole a 1 by the piston rod 15,
A gas flow chamber 16 communicating with the blow hole 9 is formed.
A rod-shaped valve body 17 having a smaller diameter than that of the piston rod 15 is integrally provided at the tip of the piston rod 15.
Be inserted and removed. Step b between the medium diameter hole a 2 and the large diameter hole a 3
Acts as a stopper for the piston 12, and the piston 1
In the state where 2 abuts against the stepped portion b, the valve body 17 is inserted into the blowing hole 9 at the forward limit, so that the blowing hole 9 is closed.
【００１１】第１，第２油圧室１３，１４は油路１８，
１９を介して切換弁２０の第１，第２ポートにそれぞれ
接続され、その切換弁２０の圧力ポートは作動源として
の油圧源２１に、また戻りポートは油タンク２２にそれ
ぞれ接続される。流通室１６は遮断弁２３を持つガス路
２４を介して窒素ガス等の高圧ガス供給源２５に接続さ
れる。The first and second hydraulic chambers 13 and 14 are provided with oil passages 18,
The switching valve 20 is connected to the first and second ports of the switching valve 20 via 19, and the pressure port of the switching valve 20 is connected to the hydraulic pressure source 21 as an operation source, and the return port thereof is connected to the oil tank 22. The flow chamber 16 is connected to a high pressure gas supply source 25 such as nitrogen gas via a gas passage 24 having a shutoff valve 23.
【００１２】さらに、可動型３に、流出路６を開閉する
と共にオーバフロー室７内を減圧するオーバフロー助勢
機構２６が設けられている。そのオーバフロー助勢機構
２６は次のように構成される。Further, the movable die 3 is provided with an overflow assisting mechanism 26 for opening / closing the outflow passage 6 and reducing the pressure in the overflow chamber 7. The overflow assisting mechanism 26 is configured as follows.
【００１３】オーバフロー室７の外側方において、可動
型３は、固定型２に食込むように突出する突出部２７を
有し、その突出部２７に、オーバフロー室７に連通し、
且つそれと同径のガイド孔２８と、そのガイド孔２８に
連通し、且つそれよりも大径の作動空間２９とがオーバ
フロー室７と同軸上に形成される。プランジャ３０は小
径部３１とそれと一体の大径部３２とを有し、小径部３
１はガイド孔２８およびオーバフロー室７に摺動自在に
嵌合され、また大径部３２は作動空間２９内に配設され
る。On the outer side of the overflow chamber 7, the movable die 3 has a protruding portion 27 protruding so as to bite into the fixed die 2, and the protruding portion 27 communicates with the overflow chamber 7.
Further, a guide hole 28 having the same diameter as that and an operating space 29 communicating with the guide hole 28 and having a larger diameter than that are formed coaxially with the overflow chamber 7. The plunger 30 has a small-diameter portion 31 and a large-diameter portion 32 integrated with the small-diameter portion 31.
1 is slidably fitted in the guide hole 28 and the overflow chamber 7, and the large diameter portion 32 is arranged in the working space 29.
【００１４】突出部２７に、駆動体としての第２油圧シ
リンダ３３がプランジャ３０と同軸上に配設される。第
２油圧シリンダ３３のシリンダ本体３４は、プランジャ
３０側より可動型３外部に向って順次配列された小径孔
ｃ1 、中径孔ｃ2 および大径孔ｃ3 を有する。その大径
孔ｃ3 にピストン３５が摺動自在に嵌合され、そのピス
トン３５により大径孔ｃ3 内は中径孔ｃ2 側の第１油圧
室３６とそれと反対側の第２油圧室３７とに区画され
る。また小径孔ｃ1 にピストン３５と一体のピストンロ
ッド３８が摺動自在に嵌合され、そのピストンロッド３
８はプランジャ３０の大径部３２に連結される。中径孔
ｃ2 および大径孔ｃ3 間の段部ｄは、ピストン３５のス
トッパとして機能し、ピストン３５が段部ｄに衝合した
状態ではプランジャ３０が前進限に在ってそのプランジ
ャ３０により流出路６が閉鎖される。プランジャ３０は
熱伝導性の低い材料、例えばステンレス材より構成さ
れ、その大径部３２に温度調節機能を持つ加熱部材３９
が備えられている。これによりプランジャ３０に接触す
る溶融合成樹脂の固化を防止することができる。第２油
圧室３７の端壁にプランジャ３０の後退限を調節する調
節部材４０が付設され、その調節部材４０は、端壁に螺
合されて先端部をピストン３５に対向させたボルト４１
1 と、そのボルト４１1 に螺合されたロックナット４１
2 とを有する。突出部２７に作動空間２９内を大気に連
通する通気孔４２が形成される。A second hydraulic cylinder 33, which is a driving body, is disposed on the protrusion 27 coaxially with the plunger 30. The cylinder body 34 of the second hydraulic cylinder 33 has a small diameter hole c 1 , a medium diameter hole c 2 and a large diameter hole c 3 which are sequentially arranged from the plunger 30 side toward the outside of the movable die 3. Its diameter hole c 3 the piston 35 is slidably fitted, it opposite the second hydraulic chamber of the first hydraulic chamber 36 of the large diameter hole c 3 in the medium diameter hole c 2 side by the piston 35 And 37. Further, a piston rod 38 integral with the piston 35 is slidably fitted in the small diameter hole c 1 , and the piston rod 3
8 is connected to the large diameter portion 32 of the plunger 30. The step portion d between the medium diameter hole c 2 and the large diameter hole c 3 functions as a stopper of the piston 35, and when the piston 35 abuts the step portion d, the plunger 30 is in the forward limit and the plunger 30 is in the forward limit. As a result, the outflow passage 6 is closed. The plunger 30 is made of a material having a low heat conductivity, for example, a stainless material, and the large diameter portion 32 has a heating member 39 having a temperature adjusting function.
Is provided. This can prevent the molten synthetic resin coming into contact with the plunger 30 from solidifying. An adjusting member 40 for adjusting the retreat limit of the plunger 30 is attached to the end wall of the second hydraulic chamber 37, and the adjusting member 40 is screwed into the end wall and has a bolt 41 with its tip facing the piston 35.
1 and a lock nut 41 screwed to the bolt 41 1.
With two . A vent hole 42 is formed in the projecting portion 27 to communicate with the atmosphere in the working space 29.
【００１５】第１油圧室３６は、油路４３を介してガス
吹込み機構８の第１油圧室１３側の油路１８に接続され
る。また第２油圧室３７は、油路４４を介してガス吹込
み機構８の第２油圧室１４側の油路１９に接続される。The first hydraulic chamber 36 is connected via an oil passage 43 to the oil passage 18 on the first hydraulic chamber 13 side of the gas blowing mechanism 8. The second hydraulic chamber 37 is connected to the oil passage 19 on the second hydraulic chamber 14 side of the gas blowing mechanism 8 via the oil passage 44.
【００１６】次に、全体に亘って空洞部を有する中空成
形体の成形作業について説明する。 （ａ） 図１に示すように、成形型１を閉じた状態で
は、切換え弁２０が第１切換位置Ｅに保持されているの
で、第１，第２油圧シリンダ１０，３３の第１油圧室１
３，３６が油圧源２１に、また両第２油圧室１４，３７
が油タンク２２にそれぞれ接続されている。これにより
第１油圧シリンダ１０側においては、ピストン１２を介
して弁体１７が後退限に位置するので、吹込み孔９が開
放され、また第２油圧シリンダ３３側においては、ピス
トン３５を介してプランジャ３０が後退限に位置するの
で、流出路６が開放されると共にオーバフロー室７が正
規の容積に保持されている。 （ｂ） 図２に示すように、切換弁２０を第２切換位置
Ｆに保持して第１，第２油圧シリンダ１０，３３の第１
油圧室１３，３６を油タンク２２に、また第２油圧室１
４，３７を油圧源２１にそれぞれ接続し、各ピストン１
２，３５を介し弁体１７を前進限に位置させて吹込み孔
９を閉鎖し、またプランジャ３０を前進限に位置させて
流出路６を閉鎖する。このときオーバフロー室７はその
容積が最も縮小された状態になる。 （ｃ） 遮断弁２３を開放し、高圧ガス供給源２５を作
動して高圧ガスを流通室１６に導入する。 （ｄ） 射出ノズルよりゲート５を通じてキャビティ４
に溶融合成樹脂Ｒを射出して充填する。この場合、キャ
ビティ４に溶融合成樹脂Ｒが充填されるまでは流出路６
が閉鎖されているので、溶融合成樹脂Ｒに射出圧が十分
に作用してその溶融合成樹脂Ｒのキャビティ４内面との
接触面側が平滑化される。その接触面側は、成形型１に
より冷却されて流動しにくくなり、結果的に中空成形体
のスキン層を形成する。 （ｅ） 図３に示すように、切換弁２０を第１切換位置
Ｅに切換えて第１，第２油圧シリンダ１０，３３の第１
油圧室１３，３６を油圧源２１に、また第２油圧室１
４，３７を油タンク２２にそれぞれ接続し、各ピストン
１２，３５を介し弁体１７を後退限に位置させて吹込み
孔９を開放し、またプランジャ３０を後退限に位置させ
て流出路６を開放すると共にオーバフロー室７を正規の
容積に保持する。同時に溶融合成樹脂Ｒ内に吹込み孔９
を通じて高圧ガスが吹込まれ、これにより溶融合成樹脂
Ｒ内に空洞部ｖが形成されると共に過剰の溶融合成樹脂
が流出路６を通じオーバフロー室７に流出して中空成形
体Ｍが成形される。Next, a molding operation of a hollow molded body having a hollow portion throughout will be described. (A) As shown in FIG. 1, when the mold 1 is closed, the switching valve 20 is held at the first switching position E, so that the first hydraulic chambers of the first and second hydraulic cylinders 10, 33 are closed. 1
3, 36 to the hydraulic power source 21, and the second hydraulic chambers 14 and 37 on both sides.
Are connected to the oil tanks 22, respectively. As a result, on the first hydraulic cylinder 10 side, the valve body 17 is positioned at the backward limit via the piston 12, so that the blowing hole 9 is opened, and on the second hydraulic cylinder 33 side, via the piston 35. Since the plunger 30 is located at the backward limit, the outflow passage 6 is opened and the overflow chamber 7 is maintained at a regular volume. (B) As shown in FIG. 2, the switching valve 20 is held at the second switching position F so that the first and second hydraulic cylinders 10 and 33 have the first switching valve 20.
The hydraulic chambers 13 and 36 are placed in the oil tank 22, and the second hydraulic chamber 1
4, 37 are connected to the hydraulic power source 21 respectively, and each piston 1
The valve body 17 is positioned at the forward limit via 2, 35 to close the blow hole 9, and the plunger 30 is positioned at the forward limit to close the outflow passage 6. At this time, the volume of the overflow chamber 7 is in the most reduced state. (C) The shutoff valve 23 is opened and the high pressure gas supply source 25 is operated to introduce high pressure gas into the flow chamber 16. (D) Cavity 4 from injection nozzle through gate 5
Then, the molten synthetic resin R is injected and filled. In this case, the outflow passage 6 is not filled until the cavity 4 is filled with the molten synthetic resin R.
Is closed, the injection pressure sufficiently acts on the molten synthetic resin R, and the contact surface side of the molten synthetic resin R with the inner surface of the cavity 4 is smoothed. The contact surface side is cooled by the molding die 1 and becomes hard to flow, and consequently forms the skin layer of the hollow molded body. (E) As shown in FIG. 3, the switching valve 20 is switched to the first switching position E so that the first and second hydraulic cylinders 10, 33 are set to the first position.
The hydraulic chambers 13 and 36 are used as the hydraulic source 21, and the second hydraulic chamber 1
4, 37 are respectively connected to the oil tank 22, the valve body 17 is positioned at the backward limit through the pistons 12, 35 to open the blowing hole 9, and the plunger 30 is positioned at the backward limit so that the outflow passage 6 is released. Is opened and the overflow chamber 7 is maintained at a regular volume. At the same time, a blow hole 9 is formed in the molten synthetic resin R.
High-pressure gas is blown in through the hollow synthetic resin R, whereby a cavity v is formed in the molten synthetic resin R, and excess molten synthetic resin flows out into the overflow chamber 7 through the outflow passage 6 to mold the hollow molded body M.
【００１７】溶融合成樹脂Ｒにおいて、オーバフロー室
７に流出する過剰分は、キャビティ４内面との接触面側
が成形型１により冷却されて流動しにくくなっているこ
とから、内側に存する樹脂であり、したがって前記流出
によって中空成形体Ｍの表面が荒されることはない。ま
た中空成形体Ｍの空洞部ｖ内には高いガス圧が均等に作
用しているので、その肉厚の均一化が図られてひけの発
生が回避される。さらに、プランジャ３０の後退に伴い
オーバフロー室７内が減圧されるので、過剰の溶融合成
樹脂のオーバフロー室７への流出が助勢され、これによ
り中空成形加工がスムーズに、且つ短時間で行われる。
このようにして、表面性が良好で、肉厚の均一な中空成
形体Ｍを能率良く製造することができる。In the molten synthetic resin R, the excess flowing out into the overflow chamber 7 is the resin existing inside because the contact surface side with the inner surface of the cavity 4 is cooled by the molding die 1 and becomes hard to flow. Therefore, the surface of the hollow molded body M is not roughened by the outflow. Further, since the high gas pressure acts evenly in the hollow portion v of the hollow molded body M, the wall thickness is made uniform and the occurrence of sink marks is avoided. Furthermore, since the pressure inside the overflow chamber 7 is reduced as the plunger 30 moves backward, the flow of excess molten synthetic resin into the overflow chamber 7 is assisted, so that the hollow molding process can be performed smoothly and in a short time.
In this way, it is possible to efficiently manufacture the hollow molded article M having a good surface property and a uniform wall thickness.
【００１８】またガス吹込み機構８とオーバフロー助勢
機構２６とを共通１個の油圧源２１により作動させるよ
うにすると、両機構８，２６の作動タイミングをとり易
くし、また装置のコンパクト化を図ることができる。た
だし、両機構８，２６の作動を別々の作動源により行っ
てもよい。If the gas blowing mechanism 8 and the overflow assisting mechanism 26 are operated by the common one hydraulic power source 21, the operation timings of both mechanisms 8 and 26 can be easily adjusted and the apparatus can be made compact. be able to. However, the operations of both mechanisms 8 and 26 may be performed by different operation sources.
【００１９】中空成形体Ｍの肉厚を調節する場合には、
調節部材４０におけるボルト４１1の第２油圧室３７へ
の突出量を加減してプランジャ３０の後退限、したがっ
てオーバフロー室７の容積を調節するもので、例えばオ
ーバフロー室７の容積を所定値よりも減少させれば、そ
の室７に流出する溶融合成樹脂量が減るので、中空成形
体Ｍの肉厚が増加する。When the wall thickness of the hollow molded body M is adjusted,
The amount of protrusion of the bolt 41 1 into the second hydraulic chamber 37 in the adjusting member 40 is adjusted to adjust the retracting limit of the plunger 30, and thus the volume of the overflow chamber 7. For example, the volume of the overflow chamber 7 is set to a value larger than a predetermined value. If the amount is decreased, the amount of molten synthetic resin that flows into the chamber 7 is decreased, so that the wall thickness of the hollow molded body M is increased.
【００２０】図４，図５は、一部に空洞部を有する合成
樹脂製中空成形体としての自動車用リヤバンパ４５を示
す。リヤバンパ４５はその上縁部に、それに沿うワイヤ
ハーネス用挿通孔４６を有し、その挿通孔４６の長さ方
向中間部にワイヤハーネス挿入口４７が設けられ、挿通
孔４６の両端部は左、右のサイドマーカランプ取付孔４
８，４９に連通する。本発明は、このようなリヤバンパ
４５の成形にも適用され、このリヤバンパ４５はワイヤ
ハーネスをコンパクトに収納し得る、といった利点を有
する。4 and 5 show a rear bumper 45 for an automobile as a synthetic resin hollow molded body having a hollow portion in a part thereof. The rear bumper 45 has a wire harness insertion hole 46 along the upper edge portion thereof, a wire harness insertion opening 47 is provided in the longitudinal middle portion of the insertion hole 46, and both end portions of the insertion hole 46 are left, Right side marker lamp mounting hole 4
Connect to 8,49. The present invention is also applied to the molding of such a rear bumper 45, and this rear bumper 45 has an advantage that a wire harness can be compactly stored.
【００２１】[0021]
【発明の効果】請求項１記載の発明によれば、前記のよ
うに比較的簡単な手段を採用することによって、良好な
表面性と均一な肉厚を備えた高品質な中空成形体を能率
良く成形し得る成形装置を提供することができる。According to the first aspect of the present invention, by adopting the relatively simple means as described above, it is possible to efficiently produce a high-quality hollow molded article having a good surface property and a uniform wall thickness. It is possible to provide a molding device that can perform good molding.
【００２２】請求項３記載の発明によれば、前記効果に
加え、中空成形体の肉厚調節を容易に行うことができ
る、といった効果を奏する。According to the invention as set forth in claim 3, in addition to the above effects, there is an effect that the wall thickness of the hollow molded body can be easily adjusted.
【図１】可動型および固定型を閉じた状態を示す成形装
置の縦断面図である。FIG. 1 is a vertical sectional view of a molding apparatus showing a state in which a movable mold and a fixed mold are closed.
【図２】キャビティに溶融合成樹脂を充填した状態を示
す成形装置の縦断面図である。FIG. 2 is a vertical cross-sectional view of a molding apparatus showing a state where a cavity is filled with molten synthetic resin.
【図３】キャビティに充填された溶融合成樹脂にガスを
吹込んだ状態を示す成形装置の縦断面図である。FIG. 3 is a vertical cross-sectional view of a molding apparatus showing a state in which a gas is blown into a molten synthetic resin filled in a cavity.
【図４】自動車用リヤバンパの斜視図である。FIG. 4 is a perspective view of a rear bumper for an automobile.
【図５】図４の５−５線断面図である。5 is a sectional view taken along line 5-5 of FIG.
１ 成形型 ４ キャビティ ５ ゲート ６ 流出路 ７ オーバフロー室 ８ ガス吹込み機構 ２１ 油圧源（作動源） ２６ オーバフロー助勢機構 ３０ プランジャ ３３ 第２油圧シリンダ（駆動体） ３９ 加熱部材 ４０ 調節部材 Ｒ 溶融合成樹脂 ｖ 空洞部 DESCRIPTION OF SYMBOLS 1 Mold 4 Cavity 5 Gate 6 Outflow path 7 Overflow chamber 8 Gas injection mechanism 21 Oil pressure source (operation source) 26 Overflow assisting mechanism 30 Plunger 33 Second hydraulic cylinder (driving body) 39 Heating member 40 Adjusting member R Molten synthetic resin v cavity
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２９Ｌ 22:00 4Ｆ (72)発明者 田中 広巳 埼玉県狭山市新狭山１丁目10番地１ ホン ダエンジニアリング株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Reference number within the agency FI technical display location // B29L 22:00 4F (72) Inventor Hiromi Tanaka 1-10 Shin-Sayama, Sayama City, Saitama Prefecture Within Honda Engineering Co., Ltd.
Claims (4)
ャビティ（４）に連通するゲート（５）および前記成形
用キャビティ（４）に流出路（６）を介して連通するオ
ーバフロー室（７）を有する成形型（１）と、前記ゲー
ト（５）を通じて前記成形用キャビティ（４）に射出さ
れた溶融合成樹脂（Ｒ）に空洞部（ｖ）を形成すべく、
その溶融合成樹脂（Ｒ）内にガスを吹込むガス吹込み機
構（８）とを備えた成形装置において、前記成形用キャ
ビティ（４）に前記溶融合成樹脂（Ｒ）が充填されるま
では前記流出路（６）を閉鎖し、また前記ガス吹込み機
構（８）の作動中は前記流出路（６）を開放すると共に
前記オーバフロー室（７）内を減圧するオーバフロー助
勢機構（２６）を備えていることを特徴とする合成樹脂
製中空成形体用成形装置。1. A molding cavity (4), a gate (5) communicating with the molding cavity (4), and an overflow chamber (7) communicating with the molding cavity (4) through an outflow passage (6). To form a cavity (v) in the molten synthetic resin (R) injected into the molding cavity (4) through the gate (5) and a molding die (1) having
In a molding apparatus provided with a gas blowing mechanism (8) for blowing gas into the molten synthetic resin (R), the molding cavity (4) is filled with the molten synthetic resin (R) until the molding cavity is filled with the molten synthetic resin (R). An overflow assisting mechanism (26) is provided for closing the outflow passage (6), opening the outflow passage (6) during operation of the gas blowing mechanism (8), and depressurizing the inside of the overflow chamber (7). A molding apparatus for a hollow molded body made of synthetic resin, characterized in that
フロー助勢機構（２６）とを共通１個の作動源（２１）
により作動させるようにした、請求項１記載の合成樹脂
製中空成形体用成形装置。2. A common operating source (21) for the gas blowing mechanism (8) and the overflow assisting mechanism (26).
The molding apparatus for a hollow molded body made of synthetic resin according to claim 1, which is operated by
前記オーバフロー室（７）に摺動自在に嵌合されたプラ
ンジャ（３０）と、前記成形用キャビティ（４）に前記
溶融合成樹脂（Ｒ）が充填されるまでは前記オーバフロ
ー室（７）を縮小して前記流出路（６）を閉鎖すべく前
記プランジャ（３０）を前進させ、また前記ガス吹込み
機構（８）の作動中は前記流出路（６）を開放すると共
に前記オーバフロー室（７）を正規の容積まで拡大すべ
く前記プランジャ（３０）を後退させる駆動体（３３）
と、前記プランジャ（３０）の後退限を調節する調節部
材（４０）とを備えている、請求項１または２記載の合
成樹脂製中空成形体用成形装置。3. The overflow assistance mechanism (26) comprises:
The overflow chamber (7) is reduced until the plunger (30) slidably fitted into the overflow chamber (7) and the molding cavity (4) are filled with the molten synthetic resin (R). Then, the plunger (30) is advanced to close the outflow passage (6), and the outflow passage (6) is opened and the overflow chamber (7) is opened during the operation of the gas blowing mechanism (8). (33) for retracting the plunger (30) to expand the volume to the normal volume
The molding apparatus for a hollow molded body made of synthetic resin according to claim 1 or 2, further comprising: an adjusting member (40) for adjusting a retreat limit of the plunger (30).
９）を備えている、請求項３記載の合成樹脂製中空成形
体用成形装置。4. The plunger (30) includes a heating member (3).
9. The molding apparatus for synthetic resin hollow molded article according to claim 3, comprising 9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22551392A JP3283915B2 (en) | 1992-08-25 | 1992-08-25 | Molding equipment for synthetic resin hollow moldings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22551392A JP3283915B2 (en) | 1992-08-25 | 1992-08-25 | Molding equipment for synthetic resin hollow moldings |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0664024A true JPH0664024A (en) | 1994-03-08 |
| JP3283915B2 JP3283915B2 (en) | 2002-05-20 |
Family
ID=16830498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22551392A Expired - Fee Related JP3283915B2 (en) | 1992-08-25 | 1992-08-25 | Molding equipment for synthetic resin hollow moldings |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3283915B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995028275A1 (en) * | 1994-04-14 | 1995-10-26 | Asahi Kasei Kogyo Kabushiki Kaisha | Hollow integral shaft-including structural part of resin and injection molding method for production of the same |
| WO1996034731A1 (en) * | 1995-05-03 | 1996-11-07 | Melea Limited | Method and system for injection molding utilizing a variable volume spill cavity and article produced thereby |
| EP0761408A1 (en) * | 1995-08-30 | 1997-03-12 | Battenfeld GmbH | Method and apparatus for the manufacture of plastic articles |
| US5728410A (en) * | 1995-06-21 | 1998-03-17 | Melea Limited | System for injection molding of plastic article utilizing a variable volume spill cavity |
| EP0881051A1 (en) * | 1997-05-27 | 1998-12-02 | Sumitomo Chemical Company, Limited | A method and system for gas injection moulding a hollow article |
| KR20010113253A (en) * | 2000-06-17 | 2001-12-28 | 김성동 | Forming mold construction |
| DE19515741C3 (en) * | 1995-05-03 | 2002-10-24 | Melea Ltd | Method and injection molding device for producing an at least partially hollow plastic body |
-
1992
- 1992-08-25 JP JP22551392A patent/JP3283915B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995028275A1 (en) * | 1994-04-14 | 1995-10-26 | Asahi Kasei Kogyo Kabushiki Kaisha | Hollow integral shaft-including structural part of resin and injection molding method for production of the same |
| US5773109A (en) * | 1994-04-14 | 1998-06-30 | Asahi Kasei Kogyo Kabushiki Kaisha | Hollow, resin mechanical part having a shaft integrally formed therewith and an injection molding method for producing the same |
| WO1996034731A1 (en) * | 1995-05-03 | 1996-11-07 | Melea Limited | Method and system for injection molding utilizing a variable volume spill cavity and article produced thereby |
| DE19515741C3 (en) * | 1995-05-03 | 2002-10-24 | Melea Ltd | Method and injection molding device for producing an at least partially hollow plastic body |
| US5728410A (en) * | 1995-06-21 | 1998-03-17 | Melea Limited | System for injection molding of plastic article utilizing a variable volume spill cavity |
| EP0761408A1 (en) * | 1995-08-30 | 1997-03-12 | Battenfeld GmbH | Method and apparatus for the manufacture of plastic articles |
| US5759459A (en) * | 1995-08-30 | 1998-06-02 | Battenfeld Gmbh | Method for producing plastic objects |
| EP0881051A1 (en) * | 1997-05-27 | 1998-12-02 | Sumitomo Chemical Company, Limited | A method and system for gas injection moulding a hollow article |
| KR20010113253A (en) * | 2000-06-17 | 2001-12-28 | 김성동 | Forming mold construction |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3283915B2 (en) | 2002-05-20 |
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