JPH05220791A - Manufacture of frame having hollow and molded form manufactured by using it - Google Patents

Manufacture of frame having hollow and molded form manufactured by using it

Info

Publication number
JPH05220791A
JPH05220791A JP5931292A JP5931292A JPH05220791A JP H05220791 A JPH05220791 A JP H05220791A JP 5931292 A JP5931292 A JP 5931292A JP 5931292 A JP5931292 A JP 5931292A JP H05220791 A JPH05220791 A JP H05220791A
Authority
JP
Japan
Prior art keywords
synthetic resin
hollow portion
molten synthetic
auxiliary chamber
cavity
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
Application number
JP5931292A
Other languages
Japanese (ja)
Inventor
Toru Minami
Takaaki Saigou
Teruo Taniguchi
徹 南
隆晄 西郷
照雄 谷口
Original Assignee
Sutaaraito Kogyo Kk
スターライト工業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sutaaraito Kogyo Kk, スターライト工業株式会社 filed Critical Sutaaraito Kogyo Kk
Priority to JP5931292A priority Critical patent/JPH05220791A/en
Publication of JPH05220791A publication Critical patent/JPH05220791A/en
Application status is Pending legal-status Critical

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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
    • B29C45/1703Introducing an auxiliary fluid into the mould
    • B29C45/1704Introducing 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
    • B29C45/1711Introducing 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
    • 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
    • B29C45/1704Introducing 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
    • B29C45/1711Introducing 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
    • B29C2045/1713Introducing 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 using several overflow cavities

Abstract

PURPOSE:To form hollows in the whole of a frame even when the frame consisting of a particularly thick synthetic resin having square continuous or incontinuous hollows is to be formed. CONSTITUTION:One or more auxiliary chambers 9a and 9b communicated with a cavity 3 are provided. Open-close valves 11a and 11b are provided between the cavity 3 and the auxiliary chambers 9a and 9b, respectively. After melted synthetic resin is injected into the cavity 3, hollow forming liquid is put with pressure in the melted synthetic resin, and the open-close valves 11a, 11b at one side are opened so as to push out a part of the melted synthetic resin 7 to an auxiliary chamber 9 so that a hollow is formed. In the same manner, the hollow forming liquid is put with pressure in the melted synthetic resin in sequence and a part of the melted synthetic resin is pushed out to the auxiliary chambers 9a and 9b by opening the other open-close valves 11a, 11b so as to form a hollow, thereby providing hollows almost in the whole of a frame.

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、連続した或いは不連続な中空部を有する特に厚肉の合成樹脂からなる枠体の製造方法並びにその方法を用いて製造した成形品に関する。 The present invention relates to a manufacturing method and molded articles manufactured using the method of the frame consisting in particular of thick synthetic resin having a continuous or discontinuous hollow portion.

【0002】 [0002]

【従来の技術】従来の中空型物の製造方法としては、既に特開平3−121820号にて開示された方法がある。 BACKGROUND ART As a conventional method of manufacturing a hollow product, there is already a method disclosed in Japanese Unexamined Patent Publication No. 3-121820. この方法は、キャビティ内を溶融合成樹脂で満たしてからこのキャビティ内に中空部形成流体を圧入することによって、キャビティ内の溶融合成樹脂を、キャビティに連通された補助室に押し出しつつ中空部を形成するものである。 This method is formed by press-fitting the hollow portion-forming fluid into the cavity from meets the cavity with the molten synthetic resin, the hollow portion of the molten synthetic resin in the cavity, while extruding an auxiliary chamber communicating with the cavity it is intended to.

【0003】 [0003]

【発明が解決しようとする課題】しかし、従来の中空型物の製造方法により、例えば四角形の枠体aを形成する場合は、図9の如くキャビティbに連通された補助室c [0006] However, the conventional method of manufacturing a hollow product, for example, in the case of forming the frame member a rectangle, an auxiliary chamber c communicating with the cavity b as shown in FIG. 9
を設け、スプルd、ランナe、ゲートfを有する金型g The provided sprue d, runners e, mold having a gate f g
に溶融合成樹脂hをキャビティb内に射出した後、この溶融合成樹脂h内に中空部形成流体を圧入すると、中空部形成流体はゲートfから左右に分流せずに流動抵抗の小さい方向のみに流れるため、枠体a全体に中空部iが形成されずに図10に示すように四角形の枠体aの一方のみに中空部iが形成される。 The molten synthetic resin h after injected into the cavity b, and press-fitting the hollow portion-forming fluid into the molten synthetic resin h, only a small direction flow resistance hollow section forming fluid without diverting to the right and left from the gate f in to flow, the hollow portion i on only one of the frame a square as shown in FIG. 10 without the hollow portion i is formed is formed on the entire frame a. しかも、こうして形成された枠体aの中空部形成流体が圧入せずに中空部iが形成されなかった部分は、冷却にともなう溶融合成樹脂hの収縮を相殺するだけの内圧力がかからないため、大きなヒケが生じて実用可能な成形品はできなかったという問題点がある。 Moreover, since the portion thus hollow part forming fluid formed frame a is not hollow portion i is formed without press fitting, the inner pressure of only offset the shrinkage of the molten synthetic resin h with the cooling is not applied, practicable moldings large sink marks occurs there is a problem that could not be. また、図11の如くキャビティbに連通された補助室cを上下に設け、中央にスプルd、ランナe、 Furthermore, an auxiliary chamber c communicating with the cavity b as shown in FIG. 11 up and down sprue to the center d, runner e,
ゲートfを有する金型gに溶融合成樹脂hをキャビティb内に射出した後、この溶融合成樹脂h内に中空部形成流体を圧入すると、中空部形成流体はゲートf、fから左右に分流せずに流動抵抗の小さい方向のみに流れるため、枠体a全体に中空部iが形成されずに図12或いは図 After the molten synthetic resin h into the mold g having a gate f it is injected into the cavity b, and press-fitting the hollow portion-forming fluid into the molten synthetic resin h, the hollow portion-forming fluid causes diverted to the right and left from the gate f, f to flow only in the direction small flow resistance without, 12 or Fig without hollow portion i is formed on the entire frame a
13に示すように四角形の枠体aの一方のみに中空部iが形成され、同様な問題が発生する。 Only one of the frame a square as shown in 13 hollow portion i is formed, the same problem occurs.

【0004】そこで、本発明は、例えば四角形の連続した或いは不連続な中空部を有する特に厚肉の合成樹脂からなる枠体を形成する場合でも、略全体に中空部を形成することができる枠体の製造方法並びにその方法を用いて製造した成形品を提供することを目的としている。 [0004] Therefore, the present invention is, for example, even in the case of forming a frame, in particular made of synthetic resin thick having continuous or discontinuous hollow square, it is possible to form a hollow portion throughout substantially frame and its object is to provide a body of the manufacturing method and molded articles manufactured using the method.

【0005】 [0005]

【課題を解決するための手段】上記目的を達成するために、キャビティに連通された補助室を1個以上設け、そしてキャビティと補助室の間にはそれぞれ開閉弁を設けてなり、溶融合成樹脂をキャビティ内に射出した後、この溶融合成樹脂内に中空部形成流体を圧入するとともに1つの開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成し、同様にして順に溶融合成樹脂内に中空部形成流体を圧入するとともに他の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成することにより枠体の略全体が中空部を有するようにしたものである。 To achieve the above object, according to the solution to ## auxiliary chamber communicating with the cavity is provided more than one, and each will be provided on-off valve between the cavity and the auxiliary chamber, molten synthetic resin the after injected into the cavity, a portion of the molten synthetic resin hollow portion is formed by extrusion into the auxiliary chamber open one-off valves with press-fitting the hollow portion-forming fluid into the molten synthetic in resin, in the same manner substantially the entire frame by forming a hollow portion by extruding a part of the molten synthetic resin by opening the other on-off valve to the auxiliary chamber with press-fitting the hollow portion-forming fluid into the molten synthetic resin in the order of having a hollow portion it is obtained by way.

【0006】また、同じく上記目的を達成するために、 [0006] In addition, also in order to achieve the above object,
キャビティに連通された補助室を1個以上設け、そしてキャビティと補助室の間にはそれぞれ開閉弁を設けてなり、溶融合成樹脂をキャビティ内に射出した後、この溶融合成樹脂内に中空部形成流体を圧入するとともに1つの開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成し、同様にして順に溶融合成樹脂内に中空部形成流体を圧入するとともに他の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成することにより略全体が中空部を有するように形成した枠体、或いはこの枠体を一部に有するように一体成形したものである。 An auxiliary chamber communicating with the cavity is provided more than one, and each will be provided on-off valve between the cavity and the auxiliary chamber, after injecting a molten synthetic resin into the cavity, the hollow portion formed in the molten synthetic the resin other closing with a portion of the molten synthetic resin open one-off valves with press-fitting the fluid extruded to the auxiliary chamber to form a hollow portion, press-fitting the hollow portion-forming fluid into the molten synthetic resin in order in the same manner frame body substantially entirely by forming the hollow portion by extruding a part of the molten synthetic resin into the auxiliary chamber opens the valve is formed to have a hollow portion, or integrally molded so as to have the frame part one in which the.

【0007】更に、後述する効果により、溶融合成樹脂をキャビティ内に射出する場合、分岐して流入するそれぞれのキャビティの流動末端付近に補助室を設けたり、 Furthermore, the later-described effect, when injecting molten synthetic resin into the cavity, or an auxiliary chamber provided in the flow ends near the respective cavities flowing branched,
又は四角形等の閉じた枠体を形成するに際して、溶融合成樹脂流動末端に生じるウエルドラインを挟んでそれぞれに補助室を設けてなるものが特に好ましい。 Or when forming a closed frame, such as a square, those formed by providing an auxiliary chamber, respectively across a weld line that occurs in the molten synthetic resin flow end is particularly preferred.

【0008】 [0008]

【作用】以上の如く本発明の中空部を有する枠体の製造方法並びにその方法を用いて製造した成形品によれば、 According to the molded articles manufactured using the manufacturing method and a method of frame body having a hollow portion of the action described above of as the present invention,
溶融合成樹脂をキャビティ内に射出した後、この溶融合成樹脂内に中空部形成流体を圧入するとともに1つの開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成し、同様にして順に溶融合成樹脂内に中空部形成流体を圧入するとともに他の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成することかできる。 After injecting the molten synthetic resin into the cavity, a portion of the molten synthetic resin hollow portion is formed by extrusion into the auxiliary chamber open one-off valves with press-fitting the hollow portion-forming fluid into the molten synthetic the resin, It can either be formed a hollow portion by extruding part of the molten synthetic resin by opening the other on-off valve with press-fitting the hollow portion-forming fluid into the molten synthetic resin in order to the auxiliary chamber in the same manner.

【0009】また、溶融合成樹脂をキャビティ内に射出する場合、分岐して流入するそれぞれのキャビティの流動末端付近に補助室を設けたものを用いると、分岐点を基準にしてまず一方の流動末端付近の補助室の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成し、そして他方の流動末端付近の補助室の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成することにより、枠体の略全体を中空にすることができる。 [0009] When injecting molten synthetic resin into the cavity, the use of which is provided an auxiliary chamber in each of the flow end vicinity of the cavity which flows branched, based on the branch point first one of the flow-terminal the part of the molten synthetic resin by opening an auxiliary chamber of the on-off valve in the vicinity of extruded into the auxiliary chamber to form a hollow portion, and a portion of the molten synthetic resin by opening the closing valve of the auxiliary chamber in the vicinity of the other flow-terminal by forming the hollow portion extruded into the auxiliary chamber can be substantially the whole of the frame in the hollow.

【0010】更に、四角形等の閉じた枠体を形成するに際して、溶融合成樹脂流動末端に生じるウエルドラインを挟んでそれぞれに補助室を設けてなるものを用いた場合、ウエルドラインを境にして、それぞれ順に中空部を形成することができる。 Furthermore, when forming a closed frame, such as a rectangle, the case of using one made by providing an auxiliary chamber, respectively across a weld line that occurs in the molten synthetic resin flow end, and the weld line as a boundary, each can form a hollow portion in order.

【0011】 [0011]

【実施例】本発明の詳細を更に図示した実施例により説明する。 BRIEF DESCRIPTION In accordance with yet exemplary embodiment shown the details of the present invention. 図1に示すものは、本発明に係る中空部を有する枠体の製造方法により製造した自動車のナンバープレートの周囲に取り付ける飾り枠である成形品Aである。 Those shown in FIG. 1 is a molded article A is decorative frame attached to the periphery of the number plate of a motor vehicle produced by the method for producing a frame body having a hollow portion according to the present invention.
まず、図2、図4、図5、図6に基づいてこの成形品A First, FIGS. 2, 4, 5, the molded article A on the basis of FIG. 6
の製造方法について説明する。 A description will be given of a method of manufacturing.

【0012】金型1は、内部に図2のように四角形の枠体2を形成するキャビティ3を有し、このキャビティ3 [0012] the mold 1 has a cavity 3 forming the frame body 2 of the square as shown in FIG. 2 therein, the cavity 3
と連通するスプル4、ランナ5、ゲート6を設け、このキャビティ3内に溶融合成樹脂7を射出した場合に、発生するウエルドライン8を境にして両側にキャビティ3 A sprue 4 in communication, runner 5, a provided gate 6, when injecting the molten synthetic resin 7 in the cavity 3, cavity 3 on both sides by a weld line 8 for generating a boundary
に連通された補助室9を1個づつ設け、そして図4の如くキャビティ3と補助室9の間にはそれぞれ油圧シリンダー10にて作動しうる開閉弁11を設けたものである。 The auxiliary chamber 9 which communicates with one provided by one, and between the cavity 3 and the auxiliary chamber 9 as shown in FIG. 4 is provided with a closing valve 11 which may operate by a hydraulic cylinder 10, respectively. そして、図4の如く流体ノズル12を内蔵した射出ノズル13 Then, the injection nozzle 13 having a built-in fluid nozzle 12 as shown in FIG. 4
からスプル4、ランナ5、ゲート6を通ってキャビティ3内に溶融合成樹脂7を射出することができるのである。 From sprue 4, runner 5, it is possible to through the gate 6 injecting molten synthetic resin 7 in the cavity 3.

【0013】而して、射出ノズル13から金型1におけるスプル4、ランナ5、ゲート6を通って、射出成形できる熱可塑性樹脂、熱可塑性エラストマー、熱硬化性樹脂等の溶融合成樹脂7をキャビティ3内に射出した後、流体ノズル12からこの溶融合成樹脂7内に窒素ガス、炭酸ガス、空気等の中空部形成流体を圧入するとともに一方の開閉弁11aを開いて溶融合成樹脂7の一部を補助室9 [0013] In Thus, sprue 4 in the mold 1 from the injection nozzle 13, runner 5, through the gate 6, a thermoplastic resin that can be injection-molded, thermoplastic elastomer, the molten synthetic resin 7 such as a thermosetting resin cavity after injection into the 3, nitrogen gas into this molten synthetic resin 7 from the fluid nozzle 12, carbon dioxide, part of the molten synthetic resin 7 by opening one of the on-off valve 11a while pressing the hollow portion forming fluid, such as air the auxiliary chamber 9
aへ押し出して図5の如く中空部14を形成し、その後同様にして溶融合成樹脂7内に中空部形成流体を圧入するとともに他の開閉弁11bを開いて溶融合成樹脂7の一部を補助室9bへ押し出して図6の如く中空部14を形成することにより略全体が中空部14を有するようにした枠体2を成形することができる。 Extruded into a form the hollow portion 14 as shown in FIG. 5, then the auxiliary part of the molten synthetic resin 7 by opening the other on-off valve 11b while pressing the hollow portion-forming fluid in the same way the molten synthetic resin 7 it is possible to form the frame body 2 so that the whole substantially has a hollow portion 14 by forming the hollow portion 14 as shown in FIG. 6 is extruded into the chamber 9b.

【0014】次に、図3、図7、図8に基づいて第2発明に係る中空部を有する枠体の製造方法について説明する。 [0014] Next, FIG. 3, FIG. 7, a method for manufacturing the frame body is described having a hollow portion according to the second aspect of the present invention with reference to FIG. 金型1の構造は、図2及び図4で示した金型1の構造と略同じであるが、スプル4、ランナ5をキャビティ3の中央に位置させ、ゲート6、6を介して二箇所から溶融合成樹脂7をキャビティ3内に射出しするようにしたものであり、それにともなって図3のようにこのキャビティ3内に溶融合成樹脂7を射出した場合に、発生する上下二箇所のウエルドライン8を境にして両側にキャビティ3に連通された補助室9を1個づつ設け、合計4 Structure of the mold 1 is substantially the same as the structure of the mold 1 shown in FIGS. 2 and 4, sprue 4, a runner 5 is positioned at the center of the cavity 3, two positions through the gate 6,6 the molten synthetic resin 7 is obtained by so as to be injected into the cavity 3 from, when injecting the molten synthetic resin 7 on this cavity 3 as shown in FIG. 3 along with it, generating up and down two places weld of the auxiliary chamber 9 communicating with the cavity 3 on both sides by the line 8 to the boundary provided one by one, a total of 4
個の補助室9a、9b、9c、9dを設けたものである。 Number of auxiliary chambers 9a, 9b, are those provided 9c, a 9d.

【0015】而して、射出ノズル13から金型1におけるスプル4、ランナ5、ゲート6、6を通って、溶融合成樹脂7をキャビティ3内に射出した後、流体ノズル12からこの溶融合成樹脂7内に中空部形成流体を圧入するとともに一方の開閉弁11a、11bを開いて溶融合成樹脂7 [0015] In Thus, sprue 4 in the mold 1 from the injection nozzle 13, runner 5, through the gate 6,6, molten synthetic After the resin 7 was injected into the cavity 3, the molten synthetic resin from the fluid nozzle 12 one of the on-off valve 11a while pressing the hollow portion-forming fluid into the 7, open 11b molten synthetic resin 7
の一部を補助室9a、9bへ押し出して図7の如く中空部14を形成し、その後同様にして溶融合成樹脂7内に中空部形成流体を圧入するとともに他の開閉弁11c、11d Other off valves 11c, 11d together with a part of the auxiliary chamber 9a, extruded into 9b to form a hollow portion 14 as shown in FIG. 7, and then pressed into a hollow portion-forming fluid into the molten synthetic resin in the 7 in the same
を開いて溶融合成樹脂7の一部を補助室9c、9dへ押し出して図8の如く中空部14を形成することにより略全体が中空部を有するようにした枠体2を成形することができる。 It is possible to form the frame body 2 so that the whole substantially has a hollow portion by the extruded part of the molten synthetic resin 7 auxiliary chamber 9c, to 9d open forming a hollow portion 14 as shown in FIG. 8 .

【0016】このように、上述した方法により、図1に示すように内部に不連続に、或いは連続した中空部14を有する自動車のナンバープレートの周囲に取り付ける飾り枠である成形品Aを形成することができる。 [0016] Thus, by the method described above, to form a molded article A discontinuously therein, or a decorative frame attached to the periphery of a motor vehicle license plate having continuous hollow portion 14 as shown in FIG. 1 be able to. 成形品A Molded article A
は、図1のように枠体2の周端に延設片15を有するものであり、図中16、16は、補助室9内で形成される排出片であり、17は、サブマリンゲートの2次スプルであり、 Are those having an extending piece 15 in the circumferential edge of the frame body 2 as shown in FIG. 1, reference numeral 16, 16 is a discharge piece is formed in the auxiliary chamber 9, 17, the submarine gate It is a secondary sprue,
18は、取付片である。 18 is a mounting piece. 排出片16と排出片16の間に抵抗をつけることにより、中空部14を一部連続なものとしている。 By attaching a resistor between the discharge piece 16 and the discharge piece 16, it has a hollow portion 14 as a part continuous.

【0017】尚、以上は、四角形の閉じた枠体2を例に挙げて説明したが、特に限定されず、円弧状、三角形、 [0017] The above is a square closed frame body 2 is described as an example, not particularly limited, arcuate, triangular,
五角形等の多角形の閉じた或いは一部を開放した枠体2 The frame was open a closed or a part of a polygon such as pentagon 2
である成形品Aに応用でき、しかもこれらの中空の枠体2を周辺に有する成形品Aや或いは途中に中空の枠体2 Can be applied to the molded article A is, moreover hollow frame to the molded article A and or course having a frame 2 of these hollow around 2
を有する成形品Aであってもよい。 It may be a molded article A having.

【0018】このように、本発明の代表的実施例の成形品Aによれば、外観が平滑均等な厚み感のある枠体を形成することができ、塗装仕上げする場合でも通常1コート塗装で済み、最も経済的に成形品を作ることができる。 [0018] Thus, according to the molded article A representative embodiment of the present invention, the appearance can form a frame body with a smooth uniform thickness feeling in a conventional one-coat paint even when paint finish finished, it is possible to make the most economically molded products. また、厚肉の枠体の略全体にわたって中空部を有するので、剛性が高くてべこつき感がなく、取り付けピッチも大きくとれるため、固定金具等を削減することができ、しかも中空部を有するが、取付用ボス、金具インサートも自由に設けることができる。 Also, because it has a hollow portion over substantially the entire frame of the thick, no base this with feeling high rigidity, since the mounting pitch can be made large, it is possible to reduce the fixing bracket and the like, yet having a hollow portion but mounting boss, also fitting the insert can be freely provided. 更に、厚肉部分が少なくなるため、成形サイクルが短くて生産性が高くなる。 Furthermore, since the thick part is reduced, the molding cycle productivity is increased short. そして、この技術を応用することにより、自動車のナンバープレートの周囲に取り付ける飾り枠、クォータウインド枠のようなさまざまな自動車の部品を製造することができ、更に自動車の軽量化、コストダウンを図ることができる。 By applying this technology, a decorative frame for mounting around the vehicle license plate, it is possible to produce a variety of auto parts such as quarter window frame, further weight reduction of the automobile, to reduce costs can. また、テレビジョンの枠体の電化製品等さまざまな分野に応用にすることができるである。 Further, it can be applied to electronic products various fields of the television of the frame.

【0019】(実験例) 使用材料 溶融合成樹脂7としては、ABS樹脂(旭化成工業株式会社製の「スタイラックABS ID80T」)を用いた。 [0019] As Experimental Example using material molten synthetic resin 7 was used ABS resin (manufactured by Asahi Kasei Corporation, "Stylac ABS ID80T"). 成形品の寸法 キャビティ3の寸法を、450 mm×194 mm(断面形状12mm The dimensions of the cavity 3 of the molded article, 450 mm × 194 mm (cross-sectional shape 12mm
×5mm)とし、長方形の枠状成形品を中空射出成形した。 × 5 mm) and then were hollow injection molded rectangular frame-shaped molded article. そして、補助室9の寸法を25mm×8mm×10mm(厚さ)とし、キャビティ3と補助室9をつなぐ連結通路の寸法を40mm(長さ)×10mm(幅)×6mm(厚さ)としている。 Then, the dimensions of the auxiliary chamber 9 and 25mm × 8mm × 10mm (thickness), and the dimensions of the connecting passage connecting the cavity 3 the auxiliary chamber 9 and 40 mm (length) × 10 mm (width) × 6 mm (thickness) . 成形条件 キャビティ充填条件は、 射出シリンダー温度 250 ℃ 射出圧力 1,400 kgf/cm 2射出充填時間 1.5 秒 計量値 85 cc 金型温度 80 ℃とした。 Molding conditions cavity filling conditions were an injection cylinder temperature 250 ° C. Injection pressure 1,400 kgf / cm 2 injection filling time of 1.5 seconds metric 85 cc Mold temperature 80 ° C.. また、ガス射出条件は、 ガス圧力 200 kgf/cm 2保持時間 25 秒とした。 The gas injection conditions were 25 seconds the gas pressure 200 kgf / cm 2 Retention time. 比較の内容 以上の条件により、図2に示す第1発明の金型1を用い、又は、図9に示す従来の金型gを用いて中空射出成形した長方形の枠状成形品の品質を比較する。 Compared by the contents or conditions of the comparative, using a mold 1 of the first invention shown in FIG. 2, or a rectangular quality of the frame-shaped molded article was hollow injection molded using a conventional molding g shown in FIG. 9 to. 結果 図2に示す第1発明の金型1を用いた場合には、枠状成形品の略全体に中空部14が形成され、しかも補助室9a In the case of using the mold 1 of the first invention shown in Results Figure 2, the hollow portion 14 is formed on substantially the entire frame-shaped molded article, moreover auxiliary chamber 9a
と補助室9bの間はガス圧力が作用してヒケは発生しない。 And between the auxiliary chamber 9b is sink does not occur act gas pressure. しかし、図9に示す従来の金型aを用いた場合には、図10のように抵抗の少ない方向にガスが流入し、 However, in the case of using the conventional mold a shown in FIG. 9, gas flows into the small direction resistance as in FIG. 10,
一方のゲートfと補助室cの間には中空部iが形成されるが、他方のゲートfと補助室cの間は樹脂の収縮分だけガスが流入し、そしてガスの流入しない箇所はヒケが発生する。 Although hollow i between one gate f and the auxiliary chamber c is formed, while the other gate f and the auxiliary chamber c flows gas by shrinkage of the resin, and a portion where no inflow of gas sink There occur. このように、図2に示す第1発明の金型1を用いた場合と図9に示す従来の金型aを用いた場合とでは、顕著な違いが現れるのである。 Thus, in the case of using the conventional mold a shown when and 9 using a mold 1 of the first invention shown in FIG. 2 is the significant difference appears.

【0020】 [0020]

【発明の効果】本発明は、上述のとおり構成されているので、次に記載する効果を奏する。 According to the present invention, which is configured as described above, the effect which will be described. 請求項1又は請求項4記載の中空部を有する枠体の製造方法並びにその方法を用いて製造した成形品によれば、溶融合成樹脂をキャビティ内に射出した後、この溶融合成樹脂内に中空部形成流体を圧入するとともに開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成する動作を、 According to claim 1 or method of manufacturing a frame member having a hollow portion according to claim 4, wherein, as well as molded articles manufactured using the method, after injecting a molten synthetic resin into the cavity, the hollow in the molten synthetic the resin the operation of forming the hollow portion a part of the molten synthetic resin extruded to the auxiliary chamber by opening the on-off valve with press-fitting the part forming fluid,
順に補助室の数だけ行うので、厚肉の枠体の略全体にわたって中空部を形成することができる。 Is performed for the number of auxiliary chamber in order, it is possible to form a hollow portion over substantially the entire frame of thick. 従って、外観が平滑均等な厚み感のある枠体を形成することができ、塗装仕上げする場合でも通常1コート塗装で済み、最も経済的に成形品を作ることができる。 Thus, the appearance can form a frame body with a smooth uniform thickness feeling, requires only normal one-coat paint even when paint finish, can be made most economically molded article. また、厚肉の枠体の略全体にわたって中空部を有するので、剛性が高くてべこつき感がなく、取り付けピッチも大きくとれるため、 Also, because it has a hollow portion over substantially the entire frame of the thick, no base this with feeling high rigidity, since the mounting pitch can be made large,
固定金具等を削減することができ、しかも中空部を有するが、取付用ボス、金具インサートも自由に設けることができる。 It is possible to reduce the fixing bracket and the like, yet has a hollow portion, mounting bosses, also fitting the insert can be freely provided. 更に、厚肉部分が少なくなるため、成形サイクルが短くて生産性が高くなる。 Furthermore, since the thick part is reduced, the molding cycle productivity is increased short.

【0021】請求項2又は請求項5記載の中空部を有する枠体の製造方法並びにその方法を用いて製造した成形品によれば、分岐点を基準にしてまず一方の流動末端付近に補助室の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成し、そして他方の流動末端付近に補助室の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成することにより、枠体の略全体を中空にすることができるので、分岐点を境にして流動抵抗の小さい方向のみに中空部形成流体が流れるという問題点を解消することができる。 The method of manufacturing a frame member having a hollow portion according to claim 2 or claim 5, wherein, as well as according to the molded articles manufactured using the method, the auxiliary chamber is first one of the flow ends around relative to the branch point of forming a hollow portion partially extruded into the auxiliary chamber of the molten synthetic resin by opening the closing valve, and extruding a portion of the molten synthetic resin open the other near the flow ends off valve auxiliary chamber to the auxiliary chamber Te by forming the hollow portion, it is possible to substantially the entire frame in the hollow, is possible to solve the problem through the hollow portion-forming fluid only in the direction small flow resistance and a branch point as a boundary it can.

【0022】請求項3又は請求項6記載の中空部を有する枠体の製造方法並びにその方法を用いて製造した成形品によれば、四角形等の閉じた枠体を形成するに際して、溶融合成樹脂流動末端に生じるウエルドラインを挟んでそれぞれに補助室を設けているので、略全体にわたって中空部を形成することができる。 According to claim 3 or method of manufacturing a frame member having a hollow portion according to claim 6, wherein, as well as molded articles manufactured using the method, when forming a closed frame, such as a rectangle, the molten synthetic resin since an auxiliary chamber to each other across the weld line occurring flow end, it is possible to form a hollow portion throughout substantially.

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

【図1】本発明に係る中空部を有する枠体の製造方法により製造した自動車のナンバープレートの周囲に取り付ける飾り枠の斜視図 Perspective view of a decorative frame attached to the periphery of the Figure 1 number plate of a motor vehicle produced by the method for producing a frame body having a hollow portion according to the present invention

【図2】第1発明に係る中空部を有する枠体の製造方法を示す金型の横断面図 Figure 2 is a cross-sectional view of a mold showing the manufacturing method of the frame body having a hollow portion according to the first aspect of the present invention

【図3】第2発明に係る中空部を有する枠体の製造方法を示す金型の横断面図 Figure 3 is a cross-sectional view of a mold showing the manufacturing method of the frame body having a hollow portion according to the second aspect of the present invention

【図4】第1発明に係る中空部を有する枠体の製造方法における成形手順を示す金型の縦断面図 Figure 4 is a longitudinal sectional view of a mold showing a molding procedure in the method of manufacturing the frame body having a hollow portion according to the first aspect of the present invention

【図5】第1発明に係る中空部を有する枠体の製造方法における成形手順を示す金型の横断面図 Figure 5 is a cross-sectional view of a mold showing a molding procedure in the method of manufacturing the frame body having a hollow portion according to the first aspect of the present invention

【図6】第1発明に係る中空部を有する枠体の製造方法における成形手順を示す金型の横断面図 Figure 6 is a cross-sectional view of a mold showing a molding procedure in the method of manufacturing the frame body having a hollow portion according to the first aspect of the present invention

【図7】第2発明に係る中空部を有する枠体の製造方法における成形手順を示す金型の横断面図 Figure 7 is a cross-sectional view of a mold showing a molding procedure in the method of manufacturing the frame body having a hollow portion according to the second aspect of the present invention

【図8】第2発明に係る中空部を有する枠体の製造方法における成形手順を示す金型の横断面図 Figure 8 is a cross-sectional view of a mold showing a molding procedure in the method of manufacturing the frame body having a hollow portion according to the second aspect of the present invention

【図9】従来の製造方法を示す金型の横断面図 Figure 9 is a cross-sectional view of a conventional mold showing the manufacturing method

【図10】従来の製造方法における成形手順を示す金型の横断面図 Cross-sectional view of a mold showing a molding procedure in Figure 10 the conventional method

【図11】他の従来の製造方法を示す金型の横断面図 Figure 11 is a cross-sectional view of a mold showing another conventional manufacturing method

【図12】他の従来の製造方法における成形手順を示す金型の横断面図 Cross-sectional view of a mold showing a molding procedure in Figure 12 another conventional manufacturing method

【図13】同様に他の従来の製造方法における成形手順を示す金型の横断面図 Figure 13 is a cross-sectional view of a mold showing a molding procedure in other conventional manufacturing method as well

【符号の説明】 DESCRIPTION OF SYMBOLS

A 成形品 1 金型 2 枠体 3 キャビティ 4 スプル 5 ランナ 6 ゲート 7 溶融合成樹脂 8 ウエルドライン 9 補助室 10 油圧シリンダー 11 開閉弁 12 流体ノズル 13 射出ノズル 14 中空部 15 延設片 16 排出片 17 サブマリンゲートの2次スプル 18 取付片 A molded article 1 mold 2 frame 3 cavity 4 sprue 5 runners 6 gate 7 molten synthetic resin 8 weld line 9 the auxiliary chamber 10 hydraulic cylinder 11 on-off valve 12 fluid nozzle 13 injection nozzle 14 hollow portion 15 extending piece 16 discharge piece 17 secondary sprue 18 attached piece of submarine gate

───────────────────────────────────────────────────── 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 B29C 49/48 2126−4F // B29L 22:00 4F ────────────────────────────────────────────────── ─── front page continued (51) Int.Cl. 5 in identification symbol Agency Docket No. FI art display portion B29C 49/48 2126-4F // B29L 22:00 4F

Claims (6)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 キャビティに連通された補助室を1個以上設け、そしてキャビティと補助室の間にはそれぞれ開閉弁を設けてなり、溶融合成樹脂をキャビティ内に射出した後、この溶融合成樹脂内に中空部形成流体を圧入するとともに1つの開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成し、同様にして順に溶融合成樹脂内に中空部形成流体を圧入するとともに他の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成することにより枠体の略全体が中空部を有するようにした枠体の製造方法。 1. A auxiliary chamber communicating with the cavity 1 or more provided, and cavity respectively will be provided on-off valve is provided between the auxiliary chamber, after injecting a molten synthetic resin into the cavity, the molten synthetic resin press-fitting the one hollow portion forms a part of the molten synthetic resin by opening the on-off valve is extruded into the auxiliary chamber, the hollow portion-forming fluid into the molten synthetic resin in order in the same manner with press-fitting the hollow portion-forming fluid within method for producing a frame body so as to have a substantially entirely hollow portion of the frame body by forming the hollow portion by extruding a part of the molten synthetic resin by opening the other on-off valve to the auxiliary chamber while.
  2. 【請求項2】 溶融合成樹脂をキャビティ内に射出する場合、分岐して流入するそれぞれのキャビティの流動末端付近に補助室を設けてなる請求項1記載の枠体の製造方法。 2. A case of injecting a molten synthetic resin into the cavity, the production method of the branches comprising an auxiliary chamber in the vicinity of the flow end of each cavity flows claim 1, wherein the frame body.
  3. 【請求項3】 四角形等の閉じた枠体を形成するに際して、溶融合成樹脂流動末端に生じるウエルドラインを挟んでそれぞれに補助室を設けてなる請求項2記載の中空部を有する枠体の製造方法。 Upon wherein forming a closed frame, such as a rectangle, the manufacture of the frame body having a hollow portion of the molten synthetic resin flow end occurring across the weld line formed by providing an auxiliary chamber to each claim 2, wherein Method.
  4. 【請求項4】 キャビティに連通された補助室を1個以上設け、そしてキャビティと補助室の間にはそれぞれ開閉弁を設けてなり、溶融合成樹脂をキャビティ内に射出した後、この溶融合成樹脂内に中空部形成流体を圧入するとともに1つの開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成し、同様にして順に溶融合成樹脂内に中空部形成流体を圧入するとともに他の開閉弁を開いて溶融合成樹脂の一部を補助室へ押し出して中空部を形成することにより略全体が中空部を有するように形成した枠体、或いはこの枠体を一部に有するように一体成形した成形品。 Wherein an auxiliary chamber communicating with the cavity 1 or more provided, and cavity respectively will be provided on-off valve is provided between the auxiliary chamber, after injecting a molten synthetic resin into the cavity, the molten synthetic resin press-fitting the one hollow portion forms a part of the molten synthetic resin by opening the on-off valve is extruded into the auxiliary chamber, the hollow portion-forming fluid into the molten synthetic resin in order in the same manner with press-fitting the hollow portion-forming fluid within frame body substantially entirely formed to have a hollow portion by extruding a part of the molten synthetic resin into the auxiliary chamber open other off valve to form a hollow portion as well as, or in a part of the frame member a molded article which is integrally molded so as to have.
  5. 【請求項5】 溶融合成樹脂をキャビティ内に射出する場合、分岐して流入するそれぞれのキャビティの流動末端付近に補助室を設けてなる請求項4記載の成形品。 5. The molten synthetic resin when injection into the cavity, branched formed by providing an auxiliary chamber in the vicinity of the flow end of each cavity flows claim 4 molded article according.
  6. 【請求項6】 四角形等の閉じた枠体を形成するに際して、溶融合成樹脂流動末端に生じるウエルドラインを挟んでそれぞれに補助室を設けてなる請求項5記載の成形品。 6. When forming a closed frame, such as a rectangle, comprising an auxiliary chamber to each other across the weld line occurring molten synthetic resin flow end 5. The molded article according.
JP5931292A 1992-02-12 1992-02-12 Manufacture of frame having hollow and molded form manufactured by using it Pending JPH05220791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5931292A JPH05220791A (en) 1992-02-12 1992-02-12 Manufacture of frame having hollow and molded form manufactured by using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5931292A JPH05220791A (en) 1992-02-12 1992-02-12 Manufacture of frame having hollow and molded form manufactured by using it

Publications (1)

Publication Number Publication Date
JPH05220791A true JPH05220791A (en) 1993-08-31

Family

ID=13109727

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5931292A Pending JPH05220791A (en) 1992-02-12 1992-02-12 Manufacture of frame having hollow and molded form manufactured by using it

Country Status (1)

Country Link
JP (1) JPH05220791A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003080550A (en) * 2001-09-12 2003-03-19 Mitsubishi Engineering Plastics Corp Injection-molded article having a plurality of hollow parts and injection molding method
JP2010195032A (en) * 2009-01-30 2010-09-09 Rp Topla Ltd Method for manufacturing pipe with branch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003080550A (en) * 2001-09-12 2003-03-19 Mitsubishi Engineering Plastics Corp Injection-molded article having a plurality of hollow parts and injection molding method
JP4553533B2 (en) * 2001-09-12 2010-09-29 三菱エンジニアリングプラスチックス株式会社 Injection molding method for injection molded products
JP2010195032A (en) * 2009-01-30 2010-09-09 Rp Topla Ltd Method for manufacturing pipe with branch

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