JP3318506B2 - Injection molding method for resin molded product having a plurality of bosses, injection molding apparatus, and injection mold - Google Patents
Injection molding method for resin molded product having a plurality of bosses, injection molding apparatus, and injection moldInfo
- Publication number
- JP3318506B2 JP3318506B2 JP7514597A JP7514597A JP3318506B2 JP 3318506 B2 JP3318506 B2 JP 3318506B2 JP 7514597 A JP7514597 A JP 7514597A JP 7514597 A JP7514597 A JP 7514597A JP 3318506 B2 JP3318506 B2 JP 3318506B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- gas supply
- mold
- boss
- supply line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
- B29L2031/3008—Instrument panels
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)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、射出成形、ガス射
出成形、射出圧縮成形等において、有底穴を有する複数
のボスを有する成形品を成形する場合に、それらのボス
底部のヒケ発生を防止する成形方法およびそれに用いる
金型に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a molded article having a plurality of bosses having bottomed holes in injection molding, gas injection molding, injection compression molding and the like. The present invention relates to a molding method to be prevented and a mold used therefor.
【０００２】[0002]
【従来の技術】従来、ボス底部のヒケ発生を防止する方
法として、金型内に設けた圧縮ガス通路をボス穴の形成
先端まで導通させ、多孔質材でつくられた先端部を介し
て、圧縮ガスでボス底部を加圧してボス底部に発生する
ヒケの発生を防ぐ技術が提案されている（特開昭５９−
２２０３３７号公報）。2. Description of the Related Art Conventionally, as a method for preventing sink marks at the bottom of a boss, a compressed gas passage provided in a mold is electrically connected to a tip of a boss hole, and is formed through a tip made of a porous material. A technique has been proposed in which the bottom of a boss is pressurized with a compressed gas to prevent sink marks from being generated at the bottom of the boss (Japanese Patent Application Laid-Open No. S59-5959).
No. 220337).
【０００３】しかし、圧縮ガスの連通経路は、一つのボ
ス穴に通ずる一つのガス通路、更に外部の一つのガス供
給制御機構に接続する構成をとり、一つのボスに対応し
た成形法にすぎない。これに対し、多くの成形品は複数
のボスを有するのが通常であるから、複数のボスに対応
した複数のガス通路とガス供給制御機構を有するのは、
木目の細かい制御を可能とする点には優れていても複雑
な機構とコスト高になることは避けられず、むしろ簡易
な機構で、ほぼ同等の押し圧操作の可能な技術の開発が
必要であった。However, the communication path of the compressed gas is connected to one gas passage leading to one boss hole and one external gas supply control mechanism, and is only a molding method corresponding to one boss. . On the other hand, since many molded products usually have a plurality of bosses, it is a matter of having a plurality of gas passages and a gas supply control mechanism corresponding to the plurality of bosses.
Even though it is excellent at enabling fine grain control, it is unavoidable that complicated mechanisms and cost increase are unavoidable, but it is necessary to develop a technology that can perform almost the same pressing force operation with a simple mechanism. there were.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、射出成形、
ガス射出成形、射出圧縮成形等において、有底穴を有す
る複数のボスを有する成形品を成形する場合に、それら
のボスによる製品面側のヒケの発生を防止する成形方
法、成形装置およびそれに用いる金型を提供することを
目的とする。SUMMARY OF THE INVENTION The present invention relates to injection molding,
In a gas injection molding, an injection compression molding, or the like, when molding a molded product having a plurality of bosses having a bottomed hole, a molding method , a molding apparatus, and a molding apparatus for preventing generation of sink on the product surface side by the bosses The purpose is to provide a mold.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、上記課題
につき鋭意検討した結果、以下に示す内容を要旨とする
本発明を完成させた。 〔１〕有底穴を有するボス（１）を複数有する樹脂成形
品の射出成形方法であって、ボス穴部を形成する複数の
中ピン（２）のうち、ボス底部の樹脂圧がほぼ等しい箇
所の中ピン（２）を同じ幹線ガス供給ライン（５）に繋
いでおき、金型を型閉じて溶融樹脂を射出充填し、充填
終了の直前から直後の任意の時点で、外部ガス供給設備
（４０）の一又は複数のガス供給ラインのガス注入制御
弁（７）を開き、幹線ガス供給ライン（５）を介し、複
数の中ピン（２）内部に設けられたガス通路（３）及び
ガス注入ノズル（１０）を通して、中ピン（２）の先端
内の空間部（６）にガスを押し出し、ガス注入制御弁
（７）を閉じて所定時間保圧した後、ガス排出制御弁
（８）を開いて脱圧することを特徴とする複数のボスを
有する樹脂成形品の射出成形方法。 〔２〕金型（Ａ）、外部ガス供給設備（４０）及び一又
は複数の幹線ガス供給ライン（５）を備え、金型（Ａ）
はボス穴部を形成する複数の中ピン（２）を有し、各中
ピン（２）の内部にはガス通路（３）、ガス注入ノズル
（１０）及び先端空間部（６）が設けられ、外部ガス供
給設備（４０）は一又は複数のガス供給ラインを有し、
各ガス供給ラインにはガス注入制御弁（７）を介して金
型（Ａ）の内部または外部にある一の幹線ガス供給ライ
ン（５）が接続され、複数の中ピン（２）のうち、ボス
底部の樹脂圧がほぼ等しい箇所の中ピン（２）のガス通
路（３）の他端は同じ幹線ガス供給ライン（５）に連通
していることを特徴とする複数のボスを有する樹脂成形
品の射出成形装置。 〔３〕金型（Ａ）、外部ガス供給設備（４０）及び幹線
ガス供給ライン（５）を備え、金型（Ａ）はボス穴部を
形成する複数の中ピン（２）を有し、各中ピン（２）の
内部にはガス通路（３）、クリアランスの調整可能なガ
ス注入ノズル（１０）及び先端空間部（６）が設けら
れ、外部ガス供給設備（４０）は単一のガス供給ライン
を有し、ガス供給ラインにはガス注入制御弁（７）を介
して金型（Ａ）の内部または外部にある一の幹線ガス供
給ライン（５）が接続しており、樹脂ゲート近傍から流
動末端に至る各ボス穴部を形成するすべての中ピン
（２）のガス通路（３）の他端が単一の幹線ガス供給ラ
イン（５）に連通していることを特徴とする複数のボス
を有する樹脂成形品の射出成形装置。 〔４〕ボス穴部を形成する複数の中ピン（２）及び一又
は複数の幹線ガス供給ライン（５）を有し、中ピン
（２）の内部にはガス通路（３）、ガス注入ノズル（１
０）及び先端空間部（６）が設けられ、複数の中ピン
（２）のうち、ボス底部の樹脂圧がほぼ等しい箇所の中
ピン（２）のガス通路（３）の他端は同じ幹線ガス供給
ライン（５）に連通していることを特徴とする複数のボ
スを有する樹脂成形品の射出成形用金型。Means for Solving the Problems As a result of intensive studies on the above-mentioned problems, the present inventors have completed the present invention having the following contents. [1] A method for injection molding a resin molded article having a plurality of bosses (1) having bottomed holes, wherein a plurality of boss holes are formed.
In the middle pin (2), the part where the resin pressure at the bottom of the boss is almost equal
Connect the center pin (2) to the same main gas supply line (5).
Next, the mold is closed, the molten resin is injected and filled, and the external gas supply equipment
Open the one or more gas supply lines for gas injection control valve (40) (7), via a trunk line gas supply line (5), the pin in double <br/> number (2) provided inside The gas is pushed out into the space (6) in the tip of the middle pin (2) through the gas passage (3) and the gas injection nozzle (10), the gas injection control valve (7) is closed, and the pressure is maintained for a predetermined time. An injection molding method for a resin molded article having a plurality of bosses, wherein the pressure is released by opening a gas discharge control valve (8). [2] A mold (A) including a mold (A), external gas supply equipment (40), and one or more main gas supply lines (5).
Has a plurality of middle pins (2) forming a boss hole, and a gas passage (3), a gas injection nozzle (10), and a tip space (6) are provided inside each middle pin (2). The external gas supply facility (40) has one or more gas supply lines,
One gas supply line (5) inside or outside the mold (A) is connected to each gas supply line via a gas injection control valve (7) . boss
A resin molded product having a plurality of bosses, characterized in that the other end of the gas passage (3) of the middle pin (2) at a position where the resin pressure at the bottom is substantially equal communicates with the same main gas supply line (5). Injection molding equipment. [3] A mold (A), an external gas supply facility (40) and a main gas supply line (5) are provided, and the mold (A) has a plurality of middle pins (2) forming boss holes. Inside each middle pin (2), a gas passage (3), a gas injection nozzle (10) with adjustable clearance and a tip space (6) are provided, and the external gas supply equipment (40) is a single gas. A supply line, and a main gas supply line (5) inside or outside the mold (A) connected to the gas supply line via a gas injection control valve (7); The other end of the gas passageway (3) of each of the middle pins (2) forming each boss hole portion from the flow port to the flow end communicates with a single main gas supply line (5). Injection molding equipment for resin molded products having bosses. [4] It has a plurality of middle pins (2) forming a boss hole and one or more main gas supply lines (5), and a gas passage (3) and a gas injection nozzle are provided inside the middle pins (2). (1
0) and a tip space (6) are provided, and a plurality of middle pins are provided.
In (2), the other end of the gas passage (3) of the middle pin (2) at a position where the resin pressure at the bottom of the boss is substantially equal communicates with the same main gas supply line (5). For injection molding of resin molded products having bosses.
【０００６】[0006]
【発明の実施の形態】以下、本発明について詳細に説明
する。本発明は、射出成形、射出圧縮成形、ガス射出成
形等の成形法を用いて、複数の有底ボスを有する成形品
を成形する際、ボス底部に発生するヒケを防止する成形
法である。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The present invention is a molding method for preventing sink marks generated at the bottom of a boss when molding a molded article having a plurality of bottomed bosses by using a molding method such as injection molding, injection compression molding, or gas injection molding.
【０００７】ここでいう有底ボスは、他部品の取り付
け、ネジ止め等に用いられる底のない穴の貫通したボス
は対象外である。図２にその一例断面図を示すとおり、
底部（９）を有するボス（１）であり、通常、この底部
に通称「ヒケ」といわれる陥没部（１３）が発生する。
本発明に用いる金型およびガス供給制御装置の概略図を
図１に示す。ボス穴を形成する中ピン（２）を金型内に
組み込み、この中ピン（２）には内部にガス通路（３）
を有し、その先端にガス注入ノズル（４）を設ける。[0007] The boss with a bottom referred to here is not a boss through which a bottomless hole used for attaching other parts, screwing, etc. penetrates. As shown in FIG.
This is a boss (1) having a bottom (9), and a depression (13) commonly called "sink" is formed on the bottom.
FIG. 1 is a schematic view of a mold and a gas supply control device used in the present invention. A middle pin (2) for forming a boss hole is incorporated in the mold, and the middle pin (2) has a gas passage (3) therein.
And a gas injection nozzle (4) is provided at the tip.
【０００８】この中ピン（２）は、外筒部を構成する外
ピン（１１）とガス通路になる切り込み部を有しその先
端にはガス通路を一段と絞った構造を有する内ピン（１
２）とからなる。そして望ましくは、内ピン（１２）の
先端を、外ピン（１１）の先端より内側にして空間
（６）を形成する。この内ピンは、固定されたもの（１
２）でも図４に示す可変のもの（１０）でもよい。The inner pin (2) has an outer pin (11) constituting an outer cylindrical portion and a cut-out portion serving as a gas passage, and has an inner pin (1) having a structure in which the gas passage is further narrowed at its tip.
2). Desirably, the space (6) is formed with the tip of the inner pin (12) inside the tip of the outer pin (11). This inner pin is fixed (1
2) or the variable (10) shown in FIG.
【０００９】内ピン（１２）の構造の一例を図３に示す
が、ガス通路になる切り込み部を形成するところでは、
外ピン（１１）とのクリアランスが最大深さ約１ｍｍ程
度、先端の絞った部分で深さ０．０１〜０．１ｍｍ程度
である。すなわち、先端部からの樹脂の逆流防止をはか
れる程度に絞られていることが望ましい。又、内ピンと
外ピンのクリアランスが可変な中ピンは、図４に示すよ
うに、移動可変な内ピン（１０）を組み込み、金型外か
ら調整ネジの操作で内ピンを操作させて、クリアランス
を調整して、ガスの注入量を調整可能にしている。FIG. 3 shows an example of the structure of the inner pin (12).
The maximum clearance between the outer pin (11) and the outer pin (11) is about 1 mm, and the depth at the narrowed end is about 0.01 to 0.1 mm. That is, it is desirable that the diameter of the resin is narrowed to such an extent that the resin is prevented from flowing backward from the tip. As shown in FIG. 4, the inner pin having a variable clearance between the inner pin and the outer pin incorporates a movable inner pin (10), and the inner pin is operated by operating an adjusting screw from outside the mold to provide a clearance. Is adjusted so that the gas injection amount can be adjusted.
【００１０】内ピン（１２）の先端に空間（６）を設け
ることにより、圧縮ガスを注入する際、ガスの回り込み
を防ぐのに効果的である。すなわち、その空間（６）が
あることにより、その圧縮ガスはその空間の真下にある
成形品のボスの底部を金型に押圧する。ガスの流路中で
中ピンの先端ノズルにおいて圧力損失が最大となるよう
に調整し、ガスの圧力が複数個のボス基盤に均一にかか
るようにすることが必要である。By providing the space (6) at the tip of the inner pin (12), it is effective to prevent the gas from flowing around when injecting the compressed gas. That is, due to the presence of the space (6), the compressed gas presses the bottom of the boss of the molded product immediately below the space against the mold. It is necessary to adjust the pressure loss at the tip nozzle of the middle pin in the gas flow path so as to maximize the pressure loss so that the gas pressure is uniformly applied to the plurality of boss bases.
【００１１】すなわち、ボス底部の樹脂圧がほぼ等しい
箇所を一つの幹線ガス供給ラインで繋ぎ、それらのボス
穴に差し込んだ中ピンは先端ノズルのガス出口間隙をほ
ぼ同じ程度に揃えて固定し、同じ圧力損失を生ずるもの
を用いて各ボスの底部に均等にガス圧がかかるようにす
る。一般的には成形品が大型化・複雑化してくると、ボ
ス底部の樹脂圧が異なってくるのでこのような幹線ガス
供給ラインを複数配備する必要が生ずる。That is, the portions where the resin pressures at the bottom of the boss are almost equal are connected by one main gas supply line, and the middle pins inserted into the boss holes are fixed with the gas outlet gaps of the tip nozzles being substantially the same, Use the same pressure loss to evenly apply gas pressure to the bottom of each boss. In general, when a molded product becomes larger and more complicated, the resin pressure at the bottom of the boss becomes different, so that it is necessary to provide a plurality of such main gas supply lines.
【００１２】すなわち、内ピンの固定された中ピンの幾
つかを一つの幹線ガス供給ラインに接続して、全体を複
数の幹線ラインで構成する方法である。他の方法は、ボ
ス底部の樹脂圧に最も差が生ずるゲート近辺のボスと樹
脂の流動末端のボスを先端ノズルの絞り込み量が可変な
中ピン（１０）を用いて、幹線ガス供給ラインを単独化
する方法である。すなわち、ゲート近傍のボス底部の樹
脂圧は、流動末端近辺に較べ高いので、中ピンの可変ノ
ズルを緩く絞ることにより、高いガスの押し圧をかけれ
ばよく、流動末端部では逆に深く絞れば低いガスの押し
圧をかけることにより単独の幹線ガス供給ラインの接続
で所期の目的が達成できる。That is, a method in which some of the inner pins having fixed inner pins are connected to one main gas supply line, and the whole is composed of a plurality of main lines. Another method is to separate the main gas supply line from the boss in the vicinity of the gate where the resin pressure at the bottom of the boss is most different from the boss at the terminal end of the resin flow by using a middle pin (10) with a variable narrowing amount of the tip nozzle. It is a method to become. That is, since the resin pressure at the bottom of the boss near the gate is higher than that near the flow end, it is only necessary to apply a high gas pressure by squeezing the variable nozzle of the middle pin gently. By applying a low gas pressure, the intended purpose can be achieved by connecting a single main gas supply line.
【００１３】各ボス間で、内ピンの調整が必要である
が、幹線ガス供給ラインが少なく、構造がシンプルであ
る利点がある。上記いずれの方法でもこの中ピン（２）
中を貫くガス通路は、幹線ガス供給ライン（５）に接続
されており、更にこの幹線ガス供給ライン（５）は、複
数のボスに配置された中ピンに通ずると共に、金型外部
のガス供給制御装置（４０）に接続される。本発明の特
徴は、この幹線ガス供給ライン（５）を単独、又は複数
有し、この各幹線ガス供給ライン（５）へ供給する圧縮
ガスを一箇所で制御することにより、同時に複数のボス
穴へのガスの注入・保持・排出を操作することができ
る。Although adjustment of the inner pin is required between each boss, there are advantages that the number of main gas supply lines is small and the structure is simple. In any of the above methods, this pin (2)
The gas passage penetrating the inside is connected to a main gas supply line (5), and the main gas supply line (5) communicates with middle pins arranged on a plurality of bosses and supplies gas to the outside of the mold. Connected to the control device (40). A feature of the present invention is that a plurality of boss holes are simultaneously provided by controlling the compressed gas to be supplied to each of the main gas supply lines (5) alone or in a single place. Injecting, holding, and discharging gas into / from the machine can be operated.
【００１４】〔成形操作手順〕金型を閉じ、溶融樹脂を
射出充填する。充填の完了する前後に、ガス供給制御設
備（４０）より、ガス注入制御バルブ（７）を開閉し、
例えば圧力３０〜４０Ｋｇ／ｃｍ2 に調整された圧縮ガ
スを幹線ガス供給ライン（５）に供給する。圧縮ガス
は、幹線ガス供給ライン（５）を通じて、複数のボスに
導入され、中ピン（２）に供給される。 中ピンに供給
されたガスは、空間（６）に導入され、その後、ガス注
入制御弁（７）を閉じて一定時間、保持される。次いで
排出弁（８）を開放して、脱圧する。脱圧が終了した
後、金型の冷却時間を経て、金型を開放して成形品を取
り出し、成形サイクルが終了する。[Molding procedure] The mold is closed and the molten resin is injected and filled. Before and after the filling is completed, the gas supply control equipment (40) opens and closes the gas injection control valve (7),
For example, a compressed gas adjusted to a pressure of 30 to 40 kg / cm 2 is supplied to the main gas supply line (5). The compressed gas is introduced into the plurality of bosses through the main gas supply line (5) and is supplied to the center pin (2). The gas supplied to the center pin is introduced into the space (6), and thereafter, the gas injection control valve (7) is closed and held for a certain time. Next, the discharge valve (8) is opened to release the pressure. After the depressurization is completed, the mold is opened and the molded product is taken out after a mold cooling time, and the molding cycle is completed.
【００１５】[0015]
【実施例】以下、実施例により、本発明を詳細に説明す
る。 〔実施例１〕以下の材料、金型、成形機および成形条件
で、成形した。 （１）成形材料 ポリプロピレン（ＩＤＥＭＩＴＳＵ ＰＰ Ｊ−７６２
ＨＰ，ＭＩ＝１０ｇ／１０分；２３０℃、２．１６Ｋｇ
ｆ） （２）金型 成形品は自動車インストルメントパネルであり（図
５）、成形品の平均肉厚は３ｍｍである。金型構造は、
ガス射出成形仕様の構造となっており、各部にガスチャ
ンネルが配置されている。助手席側のダッシュボード近
傍に６つのボスを備えている。これらボスの全部に共通
する一本の幹線ガス供給ラインを内蔵し、外部のガス供
給制御装置に接続している。ボスの外径は１０ｍｍφ、
内径は５ｍｍφ、高さが２５ｍｍである。各ボスの中ピ
ンは、図１に示す内ピンの先端がやや内側に１ｍｍはい
った構造のもので、先端ノズルの内ピンと外ピンのクリ
アランスが０．０１〜０．１ｍｍのものを用いた。 （３）成形機 射出成形機は、東芝機械（株）製 ＩＳ２２００ＤＦ
（型締力２２００トン）を用いた。Hereinafter, the present invention will be described in detail with reference to examples. Example 1 Molding was performed using the following materials, molds, molding machines and molding conditions. (1) Molding material Polypropylene (IDEMITSU PP J-762)
HP, MI = 10 g / 10 min; 230 ° C., 2.16 Kg
f) (2) Mold The molded product is an automobile instrument panel (FIG. 5), and the average thickness of the molded product is 3 mm. The mold structure is
It has a structure of gas injection molding specification, and gas channels are arranged in each part. There are six bosses near the dashboard on the passenger side. One main gas supply line common to all of these bosses is built in and connected to an external gas supply control device. The outer diameter of the boss is 10mmφ,
The inner diameter is 5 mmφ and the height is 25 mm. The middle pin of each boss used had a structure in which the tip of the inner pin shown in FIG. 1 was slightly inward at 1 mm, and the clearance between the inner pin and the outer pin of the tip nozzle was 0.01 to 0.1 mm. (3) Molding machine The injection molding machine is IS2200DF manufactured by Toshiba Machine Co., Ltd.
(Mold clamping force: 2200 tons).
【００１６】（４）成形条件 樹脂温度： ２２０℃ 金型温度： ４０℃ 射出時間： ５秒 冷却時間： ４０秒ガス射出条件 ガス注入圧力 ：１０ＭＰａ ガス注入タイミング：樹脂を射出充填開始から４秒後 ガス注入時間 ：２．５秒 ガス保持時間 ：２０秒 脱圧時間 ：１０秒各ボス部へのガス注入条件 ガス圧力 ：４ＭＰａ ガス注入タイミング：射出充填完了から０．５秒後 ガス注入時間 ：３秒 ガス保持時間 ：２０秒 脱圧時間 ：５秒 （５）成形評価 ボス基盤のヒケの有無を観察したところ、ヒケによる表
面の窪みがなく、外観良好な製品が得られた。(4) Molding conditions Resin temperature: 220 ° C. Mold temperature: 40 ° C. Injection time: 5 seconds Cooling time: 40 seconds Gas injection conditions Gas injection pressure: 10 MPa Gas injection timing: 4 seconds after the start of injection and filling of resin Gas injection time: 2.5 seconds Gas holding time: 20 seconds Depressurization time: 10 seconds Gas injection condition to each boss portion Gas pressure: 4 MPa Gas injection timing: 0.5 seconds after completion of injection and filling Gas injection time: 3 Second Gas holding time: 20 seconds Depressurization time: 5 seconds (5) Evaluation of molding When the presence or absence of sink on the boss base was observed, a product with good appearance without any sink on the surface due to sink was obtained.
【００１７】[0017]
【発明の効果】ガス射出に用いるガス圧より低い圧力の
ガスで、簡素なガス供給ラインの設営により、複数の有
底ボスの基盤でのヒケの発生を効果的に防止することが
できる。According to the present invention, the generation of sink marks on the base of a plurality of bottomed bosses can be effectively prevented by setting up a simple gas supply line with a gas having a pressure lower than the gas pressure used for gas injection.
【００１８】[0018]
【図１】本発明に用いる金型およびガス供給制御装置の
概略図FIG. 1 is a schematic diagram of a mold and a gas supply control device used in the present invention.
【図２】本発明の対象とする有底ボスを有する成形品断
面図FIG. 2 is a sectional view of a molded product having a bottomed boss to which the present invention is applied.
【図３】本発明に用いる内ピンの斜視図FIG. 3 is a perspective view of an inner pin used in the present invention.
【図４】本発明に用いる内ピンと外ピンのクリアランス
可変型の中ピン断面図FIG. 4 is a cross-sectional view of a middle pin having a variable clearance between an inner pin and an outer pin used in the present invention.
【図５】本発明の実施例１で用いるインストルメントパ
ネル正面図FIG. 5 is a front view of the instrument panel used in the first embodiment of the present invention.
１：有底ボス ２：中ピン ３：ガス通路 ４：ガス注入ノズル ５：幹線ガス供給ライン ６：空間 ７：ガス注入制御弁 ８：ガス排出制御弁 ９：ボス底部 １０：クリアランス可変な内ピン １１：外ピン １２：内ピン １３：ヒケ １４：ボス １５：ガスチャンネル １６：減圧弁 １７：バッファータンク １８：コンプレッサー Ｇ：ガス供給源 1: bottomed boss 2: middle pin 3: gas passage 4: gas injection nozzle 5: main gas supply line 6: space 7: gas injection control valve 8: gas discharge control valve 9: boss bottom 10: clearance inner pin 11: outer pin 12: inner pin 13: sink 14: boss 15: gas channel 16: pressure reducing valve 17: buffer tank 18: compressor G: gas supply source
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/00 - 45/84 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) B29C 45/00-45/84
Claims (4)
脂成形品の射出成形方法であって、ボス穴部を形成する複数の中ピン（２）のうち、ボス底
部の樹脂圧がほぼ等しい箇所の中ピン（２）を同じ幹線
ガス供給ライン（５）に繋いでおき、 金型を型閉じて溶融樹脂を射出充填し、 充填終了の直前から直後の任意の時点で、外部ガス供給
設備（４０）の一又は複数のガス供給ラインのガス注入
制御弁（７）を開き、幹線ガス供給ライン（５）を介
し、複数の中ピン（２）内部に設けられたガス通路
（３）及びガス注入ノズル（１０）を通して、中ピン
（２）の先端内の空間部（６）にガスを押し出し、 ガス注入制御弁（７）を閉じて所定時間保圧した後、 ガス排出制御弁（８）を開いて脱圧する ことを特徴とする複数のボスを有する樹脂成形品の射出
成形方法。An injection molding method for a resin molded article having a plurality of bosses (1) having a bottomed hole, wherein a plurality of middle pins (2) forming a boss hole portion includes a boss bottom.
Connect the middle pin (2) to the same trunk line where the resin pressure is almost equal.
It is connected to the gas supply line (5), the mold is closed, and the molten resin is injected and filled. At any time immediately before and after the end of the filling, one or more gas supplies of the external gas supply equipment (40) are provided. open gas injection control valve of the line (7), via a trunk line gas supply line (5), through a pin in a multiple (2) gas passage provided inside (3) and the gas injection nozzle (10), The gas is pushed out into the space (6) in the tip of the middle pin (2), the gas injection control valve (7) is closed, the pressure is maintained for a predetermined time, and then the gas discharge control valve (8) is opened to release the pressure. An injection molding method for a resin molded product having a plurality of bosses.
び一又は複数の幹線ガス供給ライン（５）を備え、 金型（Ａ）はボス穴部を形成する複数の中ピン（２）を
有し、 各中ピン（２）の内部にはガス通路（３）、ガス注入ノ
ズル（１０）及び先端空間部（６）が設けられ、 外部ガス供給設備（４０）は一又は複数のガス供給ライ
ンを有し、 各ガス供給ラインにはガス注入制御弁（７）を介して金
型（Ａ）の内部または外部にある一の幹線ガス供給ライ
ン（５）が接続され、複数の中ピン（２）のうち、ボス底部の樹脂圧がほぼ等
しい箇所 の中ピン（２）のガス通路（３）の他端は同じ
幹線ガス供給ライン（５）に連通している ことを特徴とする複数のボスを有する樹脂成形品の射出
成形装置。2. A mold (A), an external gas supply facility (40) and one or more main gas supply lines (5), wherein the mold (A) has a plurality of intermediate pins (bosses) forming a boss hole. 2), a gas passage (3), a gas injection nozzle (10) and a tip space (6) are provided inside each middle pin (2), and one or more external gas supply facilities (40) are provided. Each of the gas supply lines is connected to one main gas supply line (5) inside or outside the mold (A) via a gas injection control valve (7) . The resin pressure at the bottom of the boss of the middle pin (2) is almost equal
Injection of the other end of the gas passage of the pin (2) in the Shii point (3) is a resin molded article having a plurality of bosses, wherein the communicating with the same <br/> mains gas supply line (5) Molding equipment.
び幹線ガス供給ライン（５）を備え、 金型（Ａ）はボス穴部を形成する複数の中ピン（２）を
有し、 各中ピン（２）の内部にはガス通路（３）、クリアラン
スの調整可能なガス注入ノズル（１０）及び先端空間部
（６）が設けられ、 外部ガス供給設備（４０）は単一のガス供給ラインを有
し、 ガス供給ラインにはガス注入制御弁（７）を介して金型
（Ａ）の内部または外部にある一の幹線ガス供給ライン
（５）が接続しており、 樹脂ゲート近傍から流動末端に至る各ボス穴部を形成す
るすべての中ピン（２）のガス通路（３）の他端が単一
の幹線ガス供給ライン（５）に連通している ことを特徴とする複数のボスを有する樹脂成形品の射出
成形装置。3. A mold (A), an external gas supply facility (40) and a main gas supply line (5), wherein the mold (A) has a plurality of middle pins (2) forming boss holes. A gas passage (3), a gas injection nozzle (10) with adjustable clearance and a tip space (6) are provided inside each middle pin (2), and a single external gas supply facility (40) is provided. A main gas supply line (5) inside or outside the mold (A) is connected to the gas supply line via a gas injection control valve (7); The other end of the gas passage (3) of each of the middle pins (2) forming each boss hole from the vicinity of the gate to the flow end is connected to a single main gas supply line (5). Injection molding apparatus for a resin molded product having a plurality of bosses.
び一又は複数の幹線ガス供給ライン（５）を有し、 中ピン（２）の内部にはガス通路（３）、ガス注入ノズ
ル（１０）及び先端空間部（６）が設けられ、複数の中ピン（２）のうち、ボス底部の樹脂圧がほぼ等
しい箇所の 中ピン（２）のガス通路（３）の他端は同じ
幹線ガス供給ライン（５）に連通している ことを特徴とする複数のボスを有する樹脂成形品の射出
成形用金型。4. A plurality of middle pins (2) forming a boss hole and one or more main gas supply lines (5), and a gas passage (3) and a gas An injection nozzle (10) and a tip space (6) are provided, and among the plurality of middle pins (2), the resin pressure at the bottom of the boss is substantially equal.
The other end of the gas passage (3) of the middle pin (2) is connected to the same main gas supply line (5). Mold for molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7514597A JP3318506B2 (en) | 1997-03-27 | 1997-03-27 | Injection molding method for resin molded product having a plurality of bosses, injection molding apparatus, and injection mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7514597A JP3318506B2 (en) | 1997-03-27 | 1997-03-27 | Injection molding method for resin molded product having a plurality of bosses, injection molding apparatus, and injection mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10264198A JPH10264198A (en) | 1998-10-06 |
| JP3318506B2 true JP3318506B2 (en) | 2002-08-26 |
Family
ID=13567750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7514597A Expired - Fee Related JP3318506B2 (en) | 1997-03-27 | 1997-03-27 | Injection molding method for resin molded product having a plurality of bosses, injection molding apparatus, and injection mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3318506B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7201443B2 (en) * | 2019-01-07 | 2023-01-10 | 本田技研工業株式会社 | GAS ASSIST MOLDING APPARATUS AND GAS ASSIST MOLDING METHOD |
-
1997
- 1997-03-27 JP JP7514597A patent/JP3318506B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10264198A (en) | 1998-10-06 |
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