JPH0872109A - Method and device for injection molding synthetic resin molded article - Google Patents

Method and device for injection molding synthetic resin molded article

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Publication number
JPH0872109A
JPH0872109A JP20962494A JP20962494A JPH0872109A JP H0872109 A JPH0872109 A JP H0872109A JP 20962494 A JP20962494 A JP 20962494A JP 20962494 A JP20962494 A JP 20962494A JP H0872109 A JPH0872109 A JP H0872109A
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Prior art keywords
cavity
molded article
air
compressed fluid
injection
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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.)
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JP20962494A
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Japanese (ja)
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JP3469647B2 (en )
Inventor
Takayoshi Tanaka
隆義 田中
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Idemitsu Petrochem Co Ltd
出光石油化学株式会社
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/26Moulds
    • B29C45/34Moulds having venting means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • B29C45/174Applying a pressurised fluid to the outer surface of the injected material inside the mould cavity, e.g. for preventing shrinkage marks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/40Removing or ejecting moulded articles
    • B29C45/43Removing or ejecting moulded articles using fluid under pressure

Abstract

PURPOSE: To obtain an injection molding method for a synthetic resin molding, capable of preventing a defect caused by residue of air in a cavity and eliminating the sinkmark, warpage, and distortion of the molding. CONSTITUTION: After a melt resin is charged in a cavity 8 with the suction of air in the cavity 8 of molds 4, 5, compressed fluid is injected to the rear surface of a molding 90 in the cavity 8 before the melt resin is completely cooled and set. The suction of air eliminates residual air in the cavity 8 and prevents a defect caused by the residual air. The molding 90 is cooled and set with the top surface pressed against an inner surface of the cavity 8 by the injection of the compressed fluid. In this manner, the molding 90 has no sinkmark on the top surface thereof even when having a rib 91.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、合成樹脂成形品の射出成形方法および射出成形装置に係り、特にボスやリブを有して成形品表面にひけが生じやすい合成樹脂成形品、 The present invention relates to synthetic relates to a resin molded article injection molding method and an injection molding apparatus, in particular bosses and a rib sink marks occur on the surface of the molded article tends to synthetic resin moldings,
例えば自動車のダッシュボード、ドアハンドルカバー等の内外装品や、家電製品のケーシング等の成形に利用できる。 For example, automobile dashboards, and interior and exterior products such as door handle cover, can be used in the molding of the casing, such as home appliances.

【0002】 [0002]

【背景技術】合成樹脂成形品を射出成形する場合、キャビティ内に空気が残っていると、充填不足(ショートショット)や焼け、ウェルドライン、ボス・リブ部表面の光沢ムラの発生といった成形品の欠陥が生じることが知られている。 BACKGROUND ART When injection molding a synthetic resin molded product, the remaining air in the cavity, filling shortage (short shot) and burnt, weld lines, the molded article such as the occurrence of gloss unevenness boss rib portion surfaces it is known that the defect occurs. このため、従来は、金型の分割面に設けたエアベントや、成形品を離型させる突き出しピンの隙間(クリアランス)から空気を逃がして前記問題を解決しようとしていた。 Therefore, conventionally, an air vent and which is provided on the dividing plane of the mold, it was trying to solve the problem a molded article from the ejector pins of the gap to release (clearance) to discharge air.

【0003】また、射出成形による合成樹脂成形品には、固有の成形収縮があるため、特にボスやリブの中心部や厚肉部など冷却が遅れた部分の収縮によって成形品の表面にはひけが生じていた。 [0003] Also, in the synthetic resin molded product by injection molding, because of the unique molding shrinkage, in particular the surface of the molded article by the contraction of the heart and including a thick portion cooling is delayed portion of the boss and the rib shrinkage It has occurred. このため、従来の射出成形では、金型のキャビティ内に射出した樹脂に、過大な保持圧力を加えてひけを防止することが行われていた。 Therefore, in the conventional injection molding, the injection resin to the cavity of the mold, it has been done to prevent shrinkage by adding an excessive holding pressure.

【0004】 [0004]

【発明が解決しようとする課題】しかしながら、前記エアベント等を介して空気を逃がしても、成形条件等によっては空気を十分に逃がすことができないことがあり、 [SUMMARY OF THE INVENTION However, even to discharge air through the air vent or the like, depending on the molding conditions or the like may not be able to escape the air sufficiently,
前記充填不足、焼け、ウェルドラインの発生などの欠陥を抑えることができず、不良品が発生するという問題があった。 The underfill, burning, can not be suppressed defects such as occurrence of weld lines, defective is disadvantageously generated.

【0005】一方、ひけ防止のために高い保持圧力を加える場合には、その圧力に耐えるように金型の剛性を向上させる必要があり、金型コストが上昇するという問題があった。 On the other hand, in the case of adding a high holding pressure for the shrinkage prevention, it is necessary to improve the rigidity of the mold to withstand the pressure, the mold cost is disadvantageously increased. また、高い保持圧力を加えると、成形品に圧力分布が発生し、成形品に反りやねじれが生じて品質が低下するという問題もあった。 Further, the addition of high holding pressure, the pressure distribution is generated in the molded product, quality warping or twisting is a problem of a reduction in molded article.

【0006】本発明の目的は、キャビティ内の空気残留による欠陥を防止でき、かつ金型コストを低減できるとともに、リブやボス等を有する合成樹脂射出成形品のひけを防止でき、成形品の反りやねじれも無くすことができて成形品を高精度に成形することができる合成樹脂成形品の射出成形方法および射出成形装置を提供することにある。 An object of the present invention can prevent defects due to air remaining in the cavity, and it is possible to reduce the mold costs, it is possible to prevent shrinkage of the synthetic resin injection molded article having a rib or boss or the like, part warpage and torsion also eliminate possible to provide a molded article molded injection molding method and an injection molding apparatus can be of a synthetic resin molded article to a high accuracy can.

【0007】 [0007]

【課題を解決するための手段】本発明の合成樹脂成形品の射出成形方法は、金型のキャビティ内の空気を吸引しながら溶融樹脂をキャビティ内に充填させた後、溶融樹脂が冷却固化しつつ状態にあるときに、キャビティ内の成形品の裏面側(キャビティ面と射出樹脂による成形品との間)に窒素ガス等の圧縮流体を注入することを特徴とする。 Means for Solving the Problems The injection molding process of synthetic resin molded article of the present invention, after the molten resin is filled into the cavity while sucking the air in the mold cavity, the molten resin is cooled and solidified when in the state being characterized by injecting a compressed fluid such as nitrogen gas into the molded article back side of the cavity (between the molded article by injection resin with the cavity surface). この際、成形品を離型させるにあたっては、前記キャビティ内の成形品が冷却固化された後に金型を開き、圧縮流体をキャビティ内の成形品の裏面側に再度注入し、その圧力で離型させてもよい。 At this time, when the to release the molded article, the open mold after the molded article in the cavity is cooled and solidified, the compressed fluid again injected on the back side of the molded product in the cavity, releasing its pressure it may be.

【0008】一方、本発明の合成樹脂成形品の射出成形装置は、前記射出成形方法を実施するに適したものであり、キャビティを形成する金型の一方に、溶融樹脂の流入を防止しかつ圧縮流体および空気の流通を許容するキャビティ内に連通された通気手段を設け、この通気手段を介してキャビティ内に圧縮流体を注入する圧縮流体注入手段と、前記通気手段を介してキャビティ内の空気を吸引する吸引手段とを設けたことを特徴とする。 On the other hand, the injection molding apparatus of a synthetic resin molded article of the present invention is suitable for carrying out the injection molding process, one of the mold forming the cavity, vital preventing the flow of molten resin the venting means communicating with the cavity to permit flow of the compressed fluid and air is provided, the compressed fluid injection means for injecting a compressed fluid into the cavity through the ventilation means, the air in the cavity through the vent means characterized in that a suction means for sucking the.

【0009】 [0009]

【作用】このような本発明においては、金型キャビティ内の空気を積極的に吸引しながら溶融樹脂をキャビティ内に充填させているので、キャビティ内の空気は確実に取り除かれて空気残留による充填不足、焼け、ウェルドライン、ボス・リブ部表面の光沢ムラなどの欠陥発生が防止される。 [Action] In this invention, since actively sucked while the molten resin air in the mold cavity and is filled into the cavity, filling with air is reliably removed air remaining in the cavity lack of burn, weld lines, the occurrence of defects such as uneven gloss boss rib portion surfaces is prevented. また、キャビティ内に充填された溶融樹脂が冷却固化しつつ状態にあるときに、成形品の裏面側に圧縮流体を注入しているため、キャビティ内の溶融樹脂(成形品)は、その表面側がキャビティ内面に押圧された状態で冷却固化されて、リブやボスを有する場合であっても成形品表面側のひけが防止される。 Further, since the molten resin filled in the cavity when in a state being cooled and solidified, and injecting compressed fluid to the rear surface side of the molded product, the molten resin in the cavity (molded article) is its front side is cooled and solidified by a pressing state in the cavity inner surface, shrinkage of the molded article surface is prevented even when having ribs or bosses.

【0010】さらに、圧縮流体の注入によってひけを防止しているため、キャビティ内に射出される溶融樹脂に過大な保持圧力を加える必要が無く、低圧力の射出成形が行えて成形品の反りやねじれも防止され、かつ金型剛性も小さくできて金型コストが低減されるとともに、低圧成形により生産性も向上される。 Furthermore, since the preventing shrinkage by injection of compressed fluid, it is not necessary to add an excessive holding pressure to the molten resin injected into the cavity, part warpage Ya by injection molding of low pressure can twist is also prevented, and along with the mold rigidity can be reduced by the mold costs are reduced, productivity is also enhanced by low pressure molding.

【0011】 [0011]

【実施例】以下、本発明の一実施例を図面に基づいて説明する。 BRIEF DESCRIPTION based on an embodiment of the present invention with reference to the accompanying drawings. 図1には、本実施例の射出成形装置1の概略構成図が示されている。 Figure 1 is a schematic structural view of an injection molding apparatus 1 of this embodiment. 射出成形装置1は、スクリュー2 Injection molding apparatus 1, a screw 2
を有して樹脂を溶融混練する射出装置3と、固定金型4 The emitter 3 of melt-kneading the resin with a fixed die 4
および可動金型5が取り付けられた型締装置6とを備えている。 And the movable die 5 and a clamping device 6 attached.

【0012】各金型4,5には、成形品90を成形するためのキャビティ8が形成されている。 [0012] Each mold 4 and 5, a cavity 8 for molding a molded article 90 is formed. また、金型5には、成形品90のリブ91を形成するための凹溝19が形成されている。 Further, the mold 5, the groove 19 for forming the rib 91 of the molded product 90 is formed. そして、可動金型5の凹溝19間には、それぞれ貫通孔10が形成され、その一端はキャビティ8内に開口されている。 And, between the grooves 19 of the movable mold 5 are respectively a through-hole 10 is formed, one end of which is open to the cavity 8.

【0013】貫通孔10内には、図2にも示すように、 [0013] The through hole 10, as shown in FIG. 2,
固定ピン30が配置されている。 Fixing pin 30 is disposed. また、貫通孔10のキャビティ8側に開口された先端部は、小径とされて固定ピン30の先端側とのクリアランスAが1/100 〜8/100 The end portion which is opened to the cavity 8 side of the through hole 10, the clearance A is 1/100 8/100 between the tip side of the fixing pin 30 is a small diameter
mm(10〜80μm)となるように設定されている。 mm are set so that (10 to 80 [mu] m).

【0014】貫通孔10の他端側は大径とされ、この大径部に合わせて固定ピン30の他端側(キャビティ8とは反対側)は大径部30Aとされている。 [0014] The other end side of the through-hole 10 is a large diameter, the other end of the fixing pin 30 to fit the large-diameter portion (opposite side of the cavity 8) is a large diameter portion 30A. 貫通孔10と固定ピン30の大径部30A間には、隙間をシールするOリング等のシール材21が設けられている。 Between the large diameter portion 30A of the through hole 10 and the fixed pin 30, the seal member 21 such as an O-ring for sealing the gap is provided.

【0015】金型5には、前記各貫通孔10にそれぞれ連通された通気路11が形成されている。 [0015] The mold 5, the vent path 11 that said communicated respectively to the through holes 10 are formed. 通気路11 Air passage 11
は、図1に示すように、途中で分岐されてそれぞれ注入側電磁バルブ16および吸引側電磁バルブ17を介して圧縮流体注入装置12および吸引装置13に接続されている。 As shown in FIG. 1, it is connected to the compressed fluid injection apparatus 12 and the suction device 13 through the respective injection-side electromagnetic valve 16 and the suction-side electromagnetic valve 17 is branched on the way.

【0016】圧縮流体注入装置12は、コンプレッサからの駆動エアによって駆動されて注入用の窒素ガスを増圧して圧縮流体とする増圧器等により構成されている。 The compressed fluid injecting device 12 is constituted by a booster or the like to the compression fluid pressure increasing nitrogen gas for injection is driven by the driving air from the compressor.
また、吸引装置13は、排気用の各種ポンプ等により構成されている。 The suction device 13 is constituted by various pump for exhaust. これらの圧縮流体注入装置12および吸引装置13は、射出装置3からの信号によって、つまり射出タイミングによって各々独立して制御されている。 These compressed fluid injection apparatus 12 and the suction device 13, by a signal from the emitter 3, i.e. are each independently controlled by an injection timing.
また、各バルブ16,17は、各装置12,13によってその開閉が制御されている。 Furthermore, each valve 16, 17 opening and closing is controlled by the respective devices 12 and 13. そして、本実施例においては、注入側電磁バルブ16および圧縮流体注入装置1 Then, in the present embodiment, the injection-side electromagnetic valve 16 and the compressed fluid injection device 1
2によって圧縮流体注入手段が構成され、吸引側電磁バルブ17および吸引装置13によって吸引手段が構成され、貫通孔10、通気路11および固定ピン30によって通気手段が構成されている。 2 consists compressed fluid injection means by, the suction side solenoid valve 17 and the suction device 13 is configured suction means, the through hole 10, and is configured ventilation means by air passage 11 and the fixed pin 30.

【0017】次に、本実施例における射出成形の手順について説明する。 [0017] Next, the procedure of injection molding in this embodiment. まず、型締装置6を利用して金型4, First, the mold 4 by using a mold clamping device 6,
5を閉じ、射出装置3により溶融樹脂をキャビティ8内に所定量射出する。 5 closed, injecting a predetermined amount into the cavity 8 of the molten resin by injection device 3. この時、射出装置3からの信号によって吸引装置13が作動されるとともに、吸引側バルブ17が開かれて、図1に示すように、キャビティ8内の空気が貫通孔10の固定ピン30とのクリアランス、貫通孔10、通気路11を通して金型5の外側に吸引排気され、樹脂はキャビティ8内にスムーズに充填される。 At this time, together with the suction device 13 is activated by a signal from the emitter 3, it is opened sucking valve 17, as shown in FIG. 1, the air in the cavity 8 of the fixed pin 30 through holes 10 clearance, the through hole 10, is sucked exhausted to the outside of the mold 5 through the vent path 11, the resin is smoothly charged into the cavity 8.

【0018】なお、成形に用いる樹脂や成形条件は、成形品90に応じて種々選択できるが、例えばメルトフローインデックス(MFI)[230℃,2.16kgf]=5g/10 [0018] The resin and molding conditions used for molding, various selected depending on the shaped article 90, for example, melt flow index (MFI) [230 ℃, 2.16kgf] = 5g / 10
minのハイインパクトポリスチレンを用い、シリンダーの設定温度を例えば210℃に設定し、金型温度を例えば35℃に設定すればよい。 Using min high-impact polystyrene, and set the setting temperature of the cylinder for example to 210 ° C., it may be set to the mold temperature, for example to 35 ° C.. この際、樹脂充填に従って固定ピン30に加わる樹脂圧力は上昇するが、貫通孔1 At this time, the resin pressure applied to the fixing pin 30 in accordance with the resin filler is increased, the through-hole 1
0のキャビティ8側先端部のクリアランスAが1/100 〜 Clearance A cavity 8 side tip of 0 1/100 -
8/100 mmと狭くされているので、貫通孔10内への樹脂流入は防止され、クリアランスに詰まることなく樹脂充填が行われる。 Since the 8/100 mm is narrow, the resin flows into the through hole 10 is prevented, the resin filler is carried out without clogging the clearance.

【0019】溶融樹脂が所定量充填され、充填終了を知らせる信号が射出装置3から吸引装置13および圧縮流体注入装置12に送られると、吸引側バルブ17が閉じられるとともに、注入側バルブ16が開かれ、さらに圧縮流体注入装置12が作動されて、図3に示すように、 The filled molten resin a predetermined amount, a signal indicating the end-of-fill is transmitted to the suction unit 13 and the compressed fluid injection apparatus 12 from the injection device 3, together with the closed suction side valve 17, the injection-side valve 16 is opened he, it is operated further compressed fluid injection device 12, as shown in FIG. 3,
通気路11を通して貫通孔10に所定圧力(例えば圧縮流体注入装置12での圧力が5MPa)に設定された窒素ガスが所定時間(例えば5秒間)注入される。 Nitrogen gas (pressure 5MPa in example compressed fluid injection apparatus 12) set in the air passage 11 a predetermined pressure into the through hole 10 through a predetermined time (e.g. 5 seconds) is injected.

【0020】この際、溶融樹脂は冷却固化されつつあってキャビティ8との間に隙間が生じているとともに、貫通孔10の他端側はシール材21でシールされているため、貫通孔10に注入された窒素ガスは、図2に示すように、固定ピン30のクリアランスを通して可動金型5 [0020] At this time, along with the gap is formed between the cavity 8 there molten resin while being cooled and solidified, the other end side of the through-hole 10 because it is sealed with a sealing material 21, the through-holes 10 injected nitrogen gas, as shown in FIG. 2, the movable mold through clearance of the fixing pin 30 5
のキャビティ8内面とこれに接している成形品90の裏面側との間に注入され、成形品90に十分な保持圧力が加わり、成形品90の表面側が固定金型4のキャビティ8内面に押圧され、ひけ発生が防止される。 Injected between the cavity 8 the inner surface of the rear surface side of the molded article 90 that this contact, joined by sufficient holding pressure on the molded article 90, the surface side of the molded article 90 is pressed against the cavity 8 the inner surface of the stationary mold 4 is, shrinkage occurs can be prevented.

【0021】その後、注入した窒素ガスが金型4,5から洩れないように、注入側バルブ16を閉じて系内をそのまま所定時間(例えば15秒間)保持する。 [0021] Thereafter, the injected nitrogen gas to prevent leakage from the mold 4, 5, closing the injection side valve 16 as a predetermined time in the system (e.g., 15 seconds) to hold. この時、 At this time,
窒素ガスは、図2,3に示すように、凹溝19間(成形品90のリブ91間)に注入されるため、ひけが生じやすいリブ91部分から窒素ガスが漏れ出すことが無く、 Nitrogen gas, as shown in FIGS. 2 and 3, to be injected between the grooves 19 (between ribs 91 of the molded article 90), without that the shrinkage leaking nitrogen gas from easily ribs 91 parts occur,
リブ91部分への十分な保持圧力が維持される。 Sufficient holding pressure on the rib 91 portion is maintained.

【0022】次に、吸引側バルブ17を開いてキャビティ8内に注入されていた窒素ガスを所定時間(例えば5 Next, the suction-side valve 17 for a predetermined time nitrogen gas was injected into the cavity 8 is opened (for example 5
秒間)かけて徐々に脱圧する。 Seconds) over a period of gradually depressurizing. なお、以上の圧縮流体(窒素ガス)の注入、保持、脱圧の制御は、圧縮流体注入装置12、吸引装置13に組み込まれた制御回路によりタイマー設定されて自動制御される。 Incidentally, the injection of more compressed fluid (nitrogen gas), the holding control of depressurization, the compression fluid injection apparatus 12, is a timer set to be automatically controlled by built-in control circuit to a suction device 13. また、圧縮流体の注入から脱圧までのタイムサイクルは適宜設定されるが、射出成形の冷却時間より2〜5秒短く設定することが好ましい。 Although cycle time from the injection of the compressed fluid to depressurization is appropriately set, it is preferable to set 2-5 seconds shorter than the cooling time of the injection molding.

【0023】そして、金型5内の成形品90(溶融樹脂)が冷却固化したら、吸引側バルブを閉じるとともに、図4に示すように金型4,5を開き、さらに注入側バルブ16を開いて圧縮流体注入装置12を作動させて所定圧力(例えば0.5〜1MPa)の窒素ガス(圧縮流体)を貫通孔10に注入して固定ピン30のクリアランスから成形品90側に噴出させ、その圧力で成形品9 [0023] Then, when the molded article 90 in the mold 5 (molten resin) is cooled and solidified, closes the suction-side valve, open the mold 4, 5, as shown in FIG. 4, the injection-side valve 16 opens further is operated is ejected from the nitrogen gas was injected (compression fluid) into the through hole 10 of the fixing pin 30 clearance of a predetermined pressure (e.g. 0.5 to 1 MPa) in the molded product 90 side compression fluid injection apparatus 12 Te, the the molded product at a pressure of 9
0を金型5から離型させて射出成形の1つのサイクルを終了する。 0 was released from the mold 5 finishes one cycle of injection molding. 以上の成形サイクルを繰り返し、成形品90 Repeating the above molding cycle, the molded product 90
を順次製造する。 The sequential production.

【0024】このような本実施例によれば、次のような効果がある。 According to the present embodiment, the following effects. キャビティ8内に溶融樹脂を充填する際に、吸引装置13を作動させてキャビティ8内の空気を外部に積極的に吸引しているので、キャビティ8内に空気が残留することが無く、空気逃げ不足による金型面の樹脂への転写不足や、空気溜まりによる樹脂の充填不足、焼け、ウェルドライン、ボス・リブ部表面の光沢ムラ等の発生といった成形品90の欠陥不良を防止することができる。 When filling a molten resin into the cavity 8, so by operating the suction device 13 has suction actively air in the cavity 8 to the outside, there is no air remains in the cavity 8, air escape missing or insufficient transfer to the mold surface of the resin by, insufficient filling of the resin due to an air pocket, burning, it is possible to prevent weld lines, poor defects of the molded article 90, such as occurrence of uneven gloss boss rib portion surfaces . これにより、成形品90の不良発生率が低下し、生産効率を向上することができる。 This makes it possible defect rate of the molded article 90 is reduced, thereby improving the production efficiency.

【0025】また、空気吸引によってキャビティ8内が負圧になるため、射出された樹脂をスムーズにキャビティ8全体に充填することができ、樹脂流動性の低下によるウェルドラインの発生等の欠陥をより確実に防止することができる。 Further, since the cavity 8 is a negative pressure by the air suction, the injected resin can be filled smoothly across the cavity 8, more defects such as generation of weld lines due to a reduction in resin flowability it can be reliably prevented.

【0026】窒素ガスを注入してガス保圧を行って溶融樹脂をキャビティ8内面に押圧しているので、溶融樹脂が冷却固化するまで樹脂表面側とキャビティ8内面との密着状態を維持することができ、リブ91やボス等を有する成形品90を成形する場合でも成形品90の表面側のひけを防止することができる。 [0026] Since the nitrogen gas injected into the molten resin by performing gas holding pressure presses the cavity 8 inside surface, the molten resin is maintained close contact with the resin surface side and the cavity 8 inside surface until cooled and solidified can be, it is possible to prevent the shrinkage of the surface side of the molded product 90 even when a molded article 90 having a rib 91 and a boss or the like.

【0027】そして、キャビティ8内に窒素ガスを注入することで成形品90のひけを防止することができるので、従来のようにひけ防止のために高圧射出成形を行う必要が無く、ひけの生じない低圧射出成形を実現することができる。 [0027] Then, it is possible to prevent shrinkage of the molded article 90 by injecting nitrogen gas into the cavity 8, it is not necessary to perform high pressure injection molding in order to prevent shrinkage, as is conventional, resulting in shrinkage it can be achieved without low-pressure injection molding. このため、低圧成形が可能であり、成形サイクルも早くできるため、成形品90の品質を低下させることなく生産性を向上することができる。 Therefore, it is possible to low-pressure molding, it is possible to faster molding cycle, it is possible to improve productivity without reducing the quality of the molded article 90.

【0028】また、低圧射出成形を行えるため、成形品90に過大な保持圧力が加わることがなく、反りやねじれ・歪みなどの成形歪みの分布を減少でき、成形品90 Further, since that allows a low-pressure injection molding, without applied excessive holding pressure to the molded article 90, can reduce the distribution of molding distortions, such as warping or twisting, warping, moldings 90
の精度を向上することができ、高品質の成形品90を成形することができる。 It is possible to improve the accuracy, it is possible to mold the molded product 90 of high quality. さらに、保持圧力を低減できるため、金型4,5の剛性もそれほど高くする必要がなく、 Furthermore, it is possible to reduce the holding pressure, the rigidity of the mold 4, 5 there is no need to so high,
金型コストも低減することができる。 Mold cost can also be reduced.

【0029】可動金型5の凹溝19間、つまり成形品9 [0029] between the groove 19 of the movable mold 5, i.e. molded article 9
0のリブ91間にガスを注入したので、注入したガスをリブ91等のひけが発生しやすい部分に保持しておくことができ、所定の保持圧力を樹脂が冷却固化するまで維持することができ、成形品90のひけを確実に防止することができる。 Having injected gas between 0 ribs 91, it injected gas can be held in sink prone parts such as the ribs 91, a predetermined holding pressure that the resin is maintained until the cooling and solidification can, it is possible to reliably prevent the shrinkage of the molded article 90.

【0030】金型4,5を開いた後に、圧縮流体を注入して成形品90を離型させているので、突き出しピンを用いた場合のように、成形型や突き出しピンの膨張・収縮量の差によって突き出しピンが動作不良となって成形品90の離型が円滑に行われず、成形品90に白化が生じるといった問題を無くすことができ、成形品90を確実にかつ円滑に取り出すことができる。 [0030] After opening the molds 4 and 5, since the compressed fluid injected into and allowed to release the molded article 90, as in the case of using the ejector pins, expansion and contraction of the mold and ejector pin release is not smoothly difference molded article 90 becomes ejector pin is malfunctioning by the can eliminate the whitening problem arises in the molded product 90, can reliably and smoothly take out the molded article 90 it can.

【0031】固定ピン30は金型5に固定されており、 [0031] The fixed pin 30 is fixed to the mold 5,
その先端を金型コア面に揃えて凹凸のない均一平面にすることができる。 The tip can be made uniform plane without irregularities aligned to the mold core surface. このため、突き出しピンを用いた場合のように、金型コア面とピン先端が揃わずにキャビティ面に凹凸が生じて成形品表面に光沢ムラが発生することを防止することができる。 Therefore, as in the case of using the ejector pins, gloss unevenness on molded article surface irregularities are produced in the cavity surface without aligned gold core surface and the pin head can be prevented from being generated.

【0032】固定ピン30周囲のクリアランスAを1/10 [0032] The fixed pin 30 around the clearance A 1/10
0 〜8/100 mmとしているので、溶融樹脂が貫通孔10内に流入することを防止できるとともに、窒素ガスや空気の流通を妨げることが無く、空気の吸引やガスの注入をスムーズに行うことができる。 Since the 0 to 8/100 mm, to perform can be prevented that the molten resin flows into the through hole 10, without to interfere with the flow of nitrogen gas or air, smooth injection of air suction or gas can. これにより、窒素ガスによる保持圧力を高めることができ、成形品90のひけを確実に防止することができる。 Thus, it is possible to increase the holding pressure with nitrogen gas, it is possible to reliably prevent the shrinkage of the molded article 90.

【0033】金型5に形成した通気路11は、圧縮流体のキャビティ8内への注入路および吸引路を兼用しているので、各々を別系統とする場合に比べて金型5を容易に製造することができる。 The air passage 11 formed in the mold 5, so also serves as a charging passage and suction passage into the cavity 8 of the compressed fluid, the mold 5 as compared with the case of the separate systems each easily it can be produced.

【0034】圧縮流体として不燃性の窒素ガスを用いているので、キャビティ8内への注入によって膨張したり加熱されても爆発のおそれがなく、射出成形の安全性を確保することができる。 [0034] because of the use of non-flammable nitrogen gas as compressed fluid, there is no risk of explosion be heated or inflated by injection into the cavity 8, it is possible to ensure the safety of the injection molding.

【0035】成形品90の裏面側と可動金型5間に窒素ガスが注入されて隙間が形成されるため、成形品90が冷却固化した後に、再度窒素ガスを注入することで、成形品90を容易に離型することができ、離型不良によるトラブル発生を防止できて効率のよい射出成形を行うことができる。 [0035] Since the nitrogen gas between the back side and the movable mold 5 of the molded article 90 a gap is injected is formed, after the molded article 90 has cooled and solidified, by injecting nitrogen gas again, the molded product 90 the can be easily release, it is possible to perform good injection molding of efficiency can be prevented troubles caused by releasing failure.

【0036】以上、本発明について好適な実施例をあげて説明したが、本発明は、この実施例に限定されるものではなく、本発明の要旨を逸脱しない範囲において種々の改良並びに設計の変更が可能である。 The invention has been described by way of preferred embodiments for the present invention, the present invention is not limited to this embodiment, various modifications and design changes without departing from the scope of the present invention it is possible. 例えば、前記実施例では、圧縮流体の注入および空気の吸引を通気路1 For example, in the above embodiment, the vent passage injection and aspiration of the air of the compressed fluid 1
1を通して行っていたが、図5に示すように、金型5に各貫通孔10に連通された2系統の通気路11A,11 Had performed through 1, as shown in FIG. 5, the mold 5 communicating with the through holes 10 2 lines of ventilation path 11A, 11
Bを形成し、各通気路11A,11Bに圧縮流体注入装置12および吸引装置13をそれぞれ連結し、キャビティ8内の空気を吸引する吸引経路と、キャビティ8内に圧縮流体を注入する注入経路とを別々に設けてもよい。 Forming a B, the air passage 11A, compressed 11B fluid injection apparatus 12 and the suction device 13 are connected, respectively, a suction passage for sucking the air in the cavity 8, the injection path for injecting a compressed fluid into the cavity 8 the may be provided separately.
このようにすれば、空気の吸引および圧縮流体の注入の切替を迅速に行うことができ、特に短時間のサイクルで吸引、注入を切り替える場合に適している。 Thus, it is possible to switch the suction and injection of the compressed fluid air rapidly, in particular suction in a short time cycle, suitable for switching the injection.

【0037】また、通気手段としては、前記実施例のように固定ピン30および貫通孔10間のクリアランスを通して空気や圧縮流体の吸引、注入を行うものに限らず、例えば、図6に示すように、貫通孔10に耐熱性のある金属やセラミックスなどからなる多孔質部材40を配置し、この多孔質部材40を通して空気の吸引および圧縮流体の注入を行ってもよい。 Further, as the ventilation means, the suction of air or compressed fluid through the clearance between the fixed pins 30 and the through hole 10 as in the above embodiment is not limited to performing the injection, for example, as shown in FIG. 6 the porous member 40 made of metal or ceramics to the through hole 10 a heat resistance placed, may be carried out an injection of suction and compressed fluid air through the porous member 40.

【0038】ここで、多孔質部材40の背面側の貫通孔10内には、多孔質部材40を固定するための固定ピン30が配置されている。 [0038] Here, in the rear-side through-hole 10 of the porous member 40, the fixing pin 30 for fixing the porous member 40 is disposed. これにより、多孔質部材40 Thus, the porous member 40
は、キャビティ8内に射出された樹脂の圧力や通気路1 The pressure and vent passage injected resin into the cavity 8 1
1を通して供給される窒素ガス(圧縮流体)の圧力が加わっても、移動することなく固定される。 Even pressure is applied of the nitrogen gas supplied (compressed fluid) through 1 is fixed without moving. また、多孔質部材40には多数の微細孔が形成されているが、この微細孔の孔径が3/100 〜8/100 mm(30〜80μm)となるように、その材質等が選択されている。 Further, the porous member 40 has a large number of micropores are formed, so that the pore size of the micropores is 3/100 ~8 / 100 mm (30~80μm), its material and the like is selected there.

【0039】このような多孔質部材40を用いても、前記実施例と同様に、空気残留を防止して成形品90の欠陥発生を抑えることができるとともに、成形品90のひけ、ねじれ、歪み等の発生や光沢ムラの発生を防止できるという効果が得られる。 [0039] Even with such a porous member 40, similarly to the foregoing embodiment, it is possible to suppress the defects of the molded article 90 to prevent the air remaining, shrinkage of the molded article 90, twisted, distorted effect that the occurrence of generation or uneven gloss etc. can be prevented.

【0040】さらに、前記固定ピン30のクリアランスに、耐熱性のある金属やセラミックスなどからなる多孔質部材を配置してもよい。 [0040] Further, the clearance of the fixing pins 30 may be disposed a porous member made of a metal or a ceramic having heat resistance. 要するに、連通手段としては、樹脂の流入を防止でき、かつ空気や圧縮流体の流通を許容するものであればよく、その具体的構成は、前記実施例、変形例のものに限らず、実施にあたって適宜設定すればよい。 In short, as the communication means, it is possible to prevent inflow of the resin, and may be one which allows the flow of air or compressed fluid, its specific structure, the embodiment is not limited to the modification, in implementing it may be appropriately set.

【0041】また、本発明はリブ91を有する成形品9 Further, the present invention is a molded article having a rib 91 9
0の射出成形に限らず、ボスを有する成形品を射出成形する場合にも用いることができる。 Is not limited to the injection molding of 0, can be used when injection molding a molded article having a boss. この際、ボス部分に所定圧のガスが保圧されるように、ボスの周囲に円周状や四角周状等の防壁を形成することが望ましい。 At this time, as the gas at a predetermined pressure to the boss portion is pressurized coercive, it is desirable to form a barrier of circumferential or a square peripheral shape or the like around the boss. さらに、本発明は、リブ91、ボスの両方が形成された成形品、リブ91、ボスが無い成形品等の各種成形品の製造にも利用することができる。 Furthermore, the present invention is the rib 91, a boss molded article both are formed of ribs 91, boss can also be used for manufacturing various molded articles free molded articles. 要するに、本発明は、前記実施例の成形品90を製造する場合に限らず、例えばコピー装置の紙供給部品等に利用される格子状の多数のリブが形成された板部材や、自動車のドアハンドルカバー等の各種の樹脂成形品に利用することができる。 In summary, the present invention is not limited to the case of producing a molded article 90 of the embodiment, for example, grid-like plate member and a large number of ribs are formed to be used in the paper supply part, etc. of the copying apparatus, automobile door it can be used for various molded products such as handle cover.

【0042】圧縮流体としては窒素ガスに限らず、圧縮空気等の他のガスを用いてもよい。 [0042] As the compressed fluid is not limited to the nitrogen gas, it may be used other gases such as compressed air. 但し、圧縮流体は溶融樹脂に接して温度が高くなるため、窒素ガスのような不燃性のガスを用いた方が安全性が高いという利点がある。 However, the compressed fluid because the temperature is higher in contact with the molten resin, there is an advantage that it is highly safe preferable to use a non-flammable gas such as nitrogen gas.

【0043】注入する圧縮流体の圧力を、例えば注入初期には低圧にし、その後高圧にするなどして、2段階以上あるいは圧力値が連続的に変化するように制御してもよい。 [0043] The pressure of the compressed fluid to be injected, for example, the injection early in the low pressure, followed by, for example, in high-pressure, two or more steps or pressure value may be controlled to continuously change. この際の圧力値は、使用する樹脂の種類等に応じて適宜設定すればよい。 Pressure value at this time may be suitably set according to the type of resin used. また、圧力制御の方法としては、減圧弁等を用いた公知の適宜な圧力制御方法が利用できる。 Further, as a method of pressure control is known appropriate pressure control method using the pressure reducing valve or the like can be used.

【0044】成形品90にリブ91やボスが形成される場合には、金型5のリブ91用の凹溝19などの先端部を一部切り欠いて、樹脂を射出充填した際に、成形品9 [0044] When the ribs 91 and bosses are formed on the molded article 90, a distal end portion, such as the groove 19 of the rib 91 of the die 5 partially cutaway, a resin upon injection and filling, molding goods 9
0におけるリブ91やボスの基部に加肉部が形成されるようにしてもよい。 May be pressurized meat portions at the base of the ribs 91 and bosses are formed at 0. 本発明においては、表面側のひけが防止される分だけ成形品90の裏面側がひけて凹むが、 In the present invention, recessed back surface side of the molded product 90 by the amount of shrinkage of the surface side is prevented shrinkage,
加肉部を形成すればひけた欠肉分が加肉部で補充されて強度低下も防止できる。 Pressurized meat portion underfill worth of sink marks be formed is supplemented with pressurized meat portion strength reduction can be prevented. この際、加肉部の樹脂量は、リブ91やボスなどが形成された部分の中心部に発生する冷却遅れ部の容積の約20〜70%にすれば、樹脂量を著しく増加させることなく、必要な強度を確保することができる。 At this time, the resin amount of pressurized meat portion, if about 20% to 70% of the volume of the cooling delay unit for generating a central portion of the portion such as the rib 91 and the boss is formed, without significantly increasing the amount of resin , it is possible to ensure the necessary strength. また、加肉部は、欠肉分に補充されて無くなるため、成形品90において加肉部が目立つことはない。 The pressurized meat portion, since no being replenished underfill amount, pressurized meat portion will not be noticeable in a molded article 90.

【0045】前記実施例では、圧縮流体を注入して成形品90を離型していたが、従来と同様に突き出しピンを設けて成形品90を離型してもよいし、突き出しピンと圧縮流体とを共に使用して成形品90を離型してもよい。 [0045] In the above embodiment, although the compressed fluid injected into was demolded moldings 90 may be demolded moldings 90 are provided pins projecting in a conventional manner ejector pins and compressed fluid preparative both molded article 90 may be demolded using.

【0046】 [0046]

【発明の効果】このような本発明によれば、キャビティ内の空気残留を防止することができ、空気残留によって発生する各種欠陥を確実に防止することができる。 Effects of the Invention According to the present invention, it is possible to prevent the air remaining in the cavity, it is possible to reliably prevent various defects caused by the air remaining. また、圧縮流体をキャビティ内に注入することで、リブやボス等を有する合成樹脂射出成形品のひけを防止でき、 Further, the compressed fluid to inject into the cavity, it is possible to prevent shrinkage of the synthetic resin injection molded article having a rib and a boss or the like,
成形品の反りや歪みも無くすことができて高精度に成形することができるとともに、樹脂圧力を低くできるため金型剛性も低減でき、金型コストを低減することができるという効果がある。 Warpage or distortion of the molded article can also be eliminated by making it possible to mold with high precision, mold stiffness for the resin pressure can be lowered can be reduced, there is an effect that it is possible to reduce mold costs.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の一実施例を示す概略構成図である。 1 is a schematic block diagram showing one embodiment of the present invention.

【図2】前記実施例の金型キャビティ部を示す拡大断面図である。 2 is an enlarged sectional view showing a mold cavity portion of the embodiment.

【図3】前記実施例における圧縮流体の注入状態を示す概略構成図である。 Figure 3 is a schematic diagram showing an injection state of the compressed fluid in the examples.

【図4】前記実施例における型開き状態を示す概略構成図である。 4 is a schematic diagram showing a mold open state in the embodiment.

【図5】本発明の変形例を示す概略構成図である。 5 is a schematic diagram showing a modification of the present invention.

【図6】本発明の他の変形例を示す拡大断面図である。 6 is an enlarged sectional view showing another modification of the present invention.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 射出成形装置 8 キャビティ 10 貫通孔 11 通気路 12 圧縮流体注入装置 13 吸引装置 16 注入側電磁バルブ 17 吸引側電磁バルブ 30 固定ピン 40 多孔質部材 90 成形品 91 リブ 1 the injection molding device 8 cavity 10 through holes 11 vent path 12 compressed fluid injecting device 13 suction device 16 implanted side electromagnetic valve 17 suction-side electromagnetic valve 30 fixed pin 40 porous member 90 molded article 91 rib

Claims (3)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 合成樹脂成形品を成形する射出成形方法において、金型のキャビティ内の空気を吸引しながら溶融樹脂をキャビティ内に充填させた後、溶融樹脂が冷却固化しつつ状態にあるときに、キャビティ内の成形品の裏面側に圧縮流体を注入することを特徴とする合成樹脂成形品の射出成形方法。 1. A injection molding method for molding a synthetic resin molded product, after the molten resin is filled into the cavity while sucking the air in the mold cavity, the molten resin is in a state while cooling and solidifying the injection molding method of a synthetic resin molded article characterized by injecting the compressed fluid to the rear surface side of the molded product in the cavity.
  2. 【請求項2】 請求項1に記載の合成樹脂成形品の射出成形方法において、前記キャビティ内の成形品が冷却固化された後に金型を開き、圧縮流体をキャビティ内の成形品の裏面側に再度注入して成形品を離型させることを特徴とする合成樹脂成形品の射出成形方法。 2. A method of injection molding a synthetic resin molded article according to claim 1, the mold is opened after the molded article in the cavity is cooled and solidified, the compressed fluid on the back side of the molded product in the cavity injection molding method of a synthetic resin molded article, characterized in that to release the molded article by injecting again.
  3. 【請求項3】 合成樹脂成形品を成形する射出成形装置において、キャビティを形成する金型の一方には、溶融樹脂の流入を防止しかつ圧縮流体および空気の流通を許容するキャビティ内に連通された通気手段が設けられ、 In the injection molding apparatus for molding a wherein a synthetic resin molded product, on one of the mold forming the cavity is communicated with the cavity to permit the flow of preventing inflow of the molten resin and the compressed fluid and air venting means is provided,
    この通気手段を介してキャビティ内に圧縮流体を注入する圧縮流体注入手段と、前記通気手段を介してキャビティ内の空気を吸引する吸引手段とを備えることを特徴とする合成樹脂成形品の射出成形装置。 A compressed fluid injection means for injecting a compressed fluid into the cavity through the vent means, the injection molding of synthetic resin molded article, characterized in that it comprises a suction means for sucking the air in the cavity through the vent means apparatus.
JP20962494A 1994-09-02 1994-09-02 Synthetic resin molded product of the injection molding method and an injection molding device Expired - Fee Related JP3469647B2 (en)

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JP2007136749A (en) * 2005-11-15 2007-06-07 Toyota Motor Corp Injection molding machine, injection molding method and mold
JP2007144935A (en) * 2005-11-30 2007-06-14 Toyoda Gosei Co Ltd Injection molding method and injection molding machine
JP2007268822A (en) * 2006-03-31 2007-10-18 Toyoda Gosei Co Ltd Injection molding method and injection molding machine
JP2008012838A (en) * 2006-07-07 2008-01-24 Kasai Kogyo Co Ltd Manufacturing process and mold for automobile interior part
US7935293B2 (en) 2005-11-30 2011-05-03 Toyoda Gosei Co., Ltd. Injection molding method and injection molding apparatus
JP2014031018A (en) * 2013-10-02 2014-02-20 Panasonic Corp Mold for resin injection molding, and injection molding method using mold
EP3275616A1 (en) * 2016-07-27 2018-01-31 Comercial de Utiles y Moldes, S.A. Device and method for the suction of air in injection molds and the subsequent expulsion of molded pieces

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007136749A (en) * 2005-11-15 2007-06-07 Toyota Motor Corp Injection molding machine, injection molding method and mold
JP2007144935A (en) * 2005-11-30 2007-06-14 Toyoda Gosei Co Ltd Injection molding method and injection molding machine
JP4650240B2 (en) * 2005-11-30 2011-03-16 豊田合成株式会社 Injection molding method and injection molding apparatus
US7935293B2 (en) 2005-11-30 2011-05-03 Toyoda Gosei Co., Ltd. Injection molding method and injection molding apparatus
JP2007268822A (en) * 2006-03-31 2007-10-18 Toyoda Gosei Co Ltd Injection molding method and injection molding machine
JP2008012838A (en) * 2006-07-07 2008-01-24 Kasai Kogyo Co Ltd Manufacturing process and mold for automobile interior part
JP2014031018A (en) * 2013-10-02 2014-02-20 Panasonic Corp Mold for resin injection molding, and injection molding method using mold
EP3275616A1 (en) * 2016-07-27 2018-01-31 Comercial de Utiles y Moldes, S.A. Device and method for the suction of air in injection molds and the subsequent expulsion of molded pieces

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