JP2004230794A - Injection molding method and its molding mold - Google Patents

Injection molding method and its molding mold Download PDF

Info

Publication number
JP2004230794A
JP2004230794A JP2003023927A JP2003023927A JP2004230794A JP 2004230794 A JP2004230794 A JP 2004230794A JP 2003023927 A JP2003023927 A JP 2003023927A JP 2003023927 A JP2003023927 A JP 2003023927A JP 2004230794 A JP2004230794 A JP 2004230794A
Authority
JP
Japan
Prior art keywords
mold
molding
resin
die
fixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2003023927A
Other languages
Japanese (ja)
Other versions
JP4037279B2 (en
Inventor
Kazuyuki Wakirin
和幸 脇林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Molten Corp
Original Assignee
Molten Corp
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 Molten Corp filed Critical Molten Corp
Priority to JP2003023927A priority Critical patent/JP4037279B2/en
Publication of JP2004230794A publication Critical patent/JP2004230794A/en
Application granted granted Critical
Publication of JP4037279B2 publication Critical patent/JP4037279B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding method wherein two members are simultaneously molded by a mold slide injection method and two molded bodies are mechanically combined using engaging parts, and its molding mold. <P>SOLUTION: This injection molding method comprises the primary molding process for injection-molding a front side member 2 and a rear side member 3 with a resin using a fixed and a movable mold, the process for opening the movable mold, sliding the mold in the vertical direction to the closing direction and closing the mold with positioning the rear side member of the movable in corresponding position with the front side member of the fixed, the process of sliding a sliding mold having a structure wherein the rear side member can be slid in the mold closing direction to the direction of the fixed mold by a specified distance to move into the front side member and forming an engaging space which wraps at least an end part of the rear side member and the secondary forming process for injecting the same resin as the surface side member into the engaging space to form the engaging part 5 which wraps the rear side member by integrating the part 5 with the front side member. By the secondary molding process, the rear side member is combined with the front side member. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、ダイスライドインジェクション法を利用した射出成形方法及びその成形金型に関する。
【0002】
【従来の技術】
従来、1次成形にて2個の半割体を形成し、2次成形にて半割体の端部に接着樹脂を注入して両者を接合するダイスライドインジェクション法が、中空体の成形方法として公知である。例えば特許文献1には、自動車用コンソールリッドやスポイラー等の樹脂中空製品を製造するに際し、外観を重視すべき表側部材と、比較的外観を軽視できる裏側部材を重ね合わせ、ダイスライドインジェクション法により中空体を成形する方法及び型が開示されている。
【0003】
【特許文献1】
特公平8−2554号公報
【0004】
【発明が解決しようとする課題】
上記公報においては、例えばスポイラーは上半割体と下半割体とが接合用樹脂にて相互に接続されて構成されるものであり、接合用樹脂は、上半割体及び下半割体に接着可能な樹脂でなければならない。しかしながら、熱可塑性樹脂として広く使用されているポリオレフィン系樹脂等にあっては他の樹脂と接着しにくく、接合用樹脂が限定されるという問題がある。特に上半割体と下半割体が異なる材質の樹脂であるとき、両者を接着する接合用樹脂は極めて限られたものになることが多く、接着強度に問題を生じることがある。
【0005】
本発明は、このような事情を考慮してなされたものであり、2個の半割体を機械的な係合機構により結合させることにより、接着のための接合用樹脂を不要とした射出成形方法及びその成形金型を提供するものである。
【0006】
【課題を解決するための手段】
本発明(請求項1)は、表側部材と裏側部材とを重ね合わせてダイスライドインジェクション法により射出成形する方法において、固定型及び可動型を用いて上記表側部材及び裏側部材を樹脂にて射出成形する1次成形工程、上記可動型を型開きし型閉じ方向に対し垂直方向にスライドさせて上記可動型の上記裏側部材を上記固定型の上記表側部材の位置に対応させて型閉じする工程、上記可動型において、上記裏側部材を型閉じ方向にスライドする構造としたスライド型を上記固定型方向に所定距離スライドさせて、上記表側部材内に移動させ、上記裏側部材の少なくとも端部を包みこむ係合空間を形成する工程、上記係合空間に上記表側部材と同一樹脂を射出注入して、上記裏側部材を包み込む係合部を上記表側部材と一体化させて形成する2次成形工程よりなり、該2次成形工程により上記裏側部材を上記表側部材に結合させるものである。
【0007】
かかる構成において、2次成形時、係合部が表側部材に溶着してこれと一体成形される。この係合部は、裏側部材の端部を包み込んで、これを表側部材に機械的に結合させる。
【0008】
本発明(請求項2)においては、表側部材と裏側部材の間に中空空間が形成される。かかる構成において、中空体構造とすることにより、成形体は軽量化される。
【0009】
本発明(請求項3)において、表側部材が軟質樹脂材料にて、裏側部材が硬質樹脂材料にて構成されるものである。かかる構成において、表面が軟らかくしかも裏側が硬質であることから、全体として形状変形しにくい成形体が製造できる。また中空体構造とすることにより、表側部材は変形自由度が大きくなり一層軟らかい感触とされる。
【0010】
本発明(請求項4)にかかる成形金型は、表側部材及び裏側部材を形成する第1及び第2キャビティの一方の面及び該第1及び第2キャビティに樹脂を射出注入する第1及び第2スプルーを有する固定型、上記第1及び第2キャビティの他方の面を有し、これらの面が上記固定型の上記第1及び第2キャビティの一方の面に対応せしめられて上記表側部材及び裏側部材を1次成形するとともに、上記第2キャビティの他方の面が上記固定型の上記第1キャビティの一方の面に対応せしめられて上記表側部材と裏側部材を結合するための2次成形をする可動型、該可動型の上記第2キャビティの他方の面を構成する型であって、型閉じ方向にスライド可能に支持され、上記2次成形のとき所定距離スライドさせて上記裏側部材を上記表側部材内に移動させ、上記裏側部材を包み込む係合空間を形成するスライド型よりなるものである。
【0011】
かかる構成において、第1及び第2のスプルーを介して第1及び第2キャビティにそれぞれ溶融樹脂が射出注入されて、表側部材及び裏側部材が成形される(1次成形)。次いで可動型が型開きされ、型閉じ方向と垂直方向にスライドせしめられて裏側部材が第1キャビティに対応せしめられ、型閉じされる。スライド型が第1キャビティ内へ所定距離スライドせしめられて、係合空間が形成され、この空間に表側部材と同一樹脂が第1スプルーを介して射出注入され、表側部材と一体化した係合部が形成される(2次成形)。この係合部は、裏側部材の端部を包み込むように係合し、裏側部材を表側部材に結合させる。
【0012】
本発明(請求項5)においては、スライド型に成形体の突き出しピンが形成されてなる。かかる構成において、2次成形終了後、スライド型に固着した状態にある成形体は、突き出しピンの突き出しにより、型から外される。
【0013】
【発明の実施の形態】
以下実施の形態を自動車用アームレストについて説明する。
図1,2において、1は、アームレストであり、軟質PVC(ポリ塩化ビニル樹脂)等の軟らかい樹脂よりなる表側部材2と、ポリプロピレン樹脂等の硬い樹脂よりなる裏側部材3よりなり、内部に中空空間4が形成されている。5は、表側部材2の端部に一体形成された係合部で、裏側部材3を包み込むように係合し、これにより両者は機械的に結合されている。かかる構造では、表側部材2の係合部5を弾性変形させて裏側部材3を分離することができる。なお裏側部材3の内部には適当間隔で複数のリブあるいは突起(図示せず)が設けられ、表側部材2の表面形状及び中空空間4が維持されている。このリブあるいは突起の間隔及び大きさ(厚さ)を変えることによりソフト感を調整することができる。アームレスト1は、搭乗者が腕を載せるための部材であるから、表側部材2は軟らかい材料が望ましく、その内側を中空空間4として軟らかさをさらに向上させている。なおこの中空空間には、スポンジをインサート成形することができる。裏側部材3はドアに固定される部材であるから、取り付け作業性、形状維持性等の観点から硬質である方が望ましい。
【0014】
次にかかる構造のアームレスト1の成形方法につき、図3〜図11を参照して説明する。
【0015】
a.固定型6と可動型7が閉じられた状態を示す。固定型6は射出成形機(図示せず)に固定されており、可動型7は、型開き、型閉じさらに型開き状態で型閉じ方向と垂直方向にスライドする構成とされている。8,9は、両方の型6,7の間に形成される、図中上下に配置された第1キャビティ及び第2キャビティで、それぞれ表側部材2及び裏側部材3が成形される。固定型6は第1及び第2キャビティ8,9の一方の面sを、可動型7は第1及び第2キャビティ8,9の他方の面tを構成する。10,11は、固定型6に形成された第1及び第2スプルー、12,13は、第1及び第2スプルー10,11に対応して、可動型7側に設けられた第1、第2ジャンプゲートであり、それぞれ第1、第2キャビティ8,9に樹脂を注入するためのものである。
【0016】
14は、可動型7内に、型閉じ方向に所定距離スライド可能に支持されたスライド型で、第2キャビティ9の他方の面tを構成する。図示の状態は、スライド型14が後退(図中左側へ移動)した場合を示す。この状態で第2キャビティ9は、裏側部材3形状に一致する空間を構成している。15aはスライド型14の後端に形成された凸部、15bは、この凸部15aが係合する可動型7側に形成された凹部である。凸部15aの凹部15b内での移動により、スライド型14の可動型7に対するスライドが規制される。17は、スライド型14内に形成された突き出しピンであり、成形後成形体がこのピンの17突き出しにより、可動型7から外される。
【0017】
b.型閉じ状態において、第1及び第2スプルー10,11及び第1及び第2ジャンプゲート12,13を介して第1及び第2キャビティ8,9へ、それぞれ軟質樹脂及び硬質樹脂が加熱溶融状態で射出注入される(1次成形)。
【0018】
c.可動型7が後退(図中左方向へ移動)し型開きされる。スプルー、ランナー及びゲート部分の樹脂が除去される。このとき、表側部材2は第1キャビティ8の一方の面s(固定型側面)に、裏側部材3は第2キャビティ9の他方の面t(スライド型面)に固着された状態にある。
【0019】
d.可動型7が型閉じ方向に対し垂直方向(図中上方)へスライドされ、スライド型14の裏側部材3固着面sが第1キャビティ8に相対する位置まで移動される。
【0020】
e.可動型7が前進(図中右方向へ移動)し型閉じされる。このとき同時にスライド型14も前方(図中右方向)へ凸部15aが凹部15bの壁面に当たるまでスライドされ、裏側部材3を第1キャビティ8内へ押し出す。これにより裏側部材3は表側部材2の内側に移動し、裏側部材3の図中上側側面pと図中下側端部qが表側部材2の内側に接触する。このとき、表側部材2と裏側部材3の間には空間18が維持される。スライド型14のスライドにより、可動型7に形成された第3ジャンプゲート16が連通する表側部材2に接する部分に係合空間18が形成される。
【0021】
f.第3ジャンプゲート16は、第1スプルー10に相対する位置にあり、これらを介して表側部材2と同一樹脂材料が係合空間18に射出注入される(2次成形)。これにより表側部材2の端部に係合部5が一体形成される。係合部5は、裏側部材3を包み込むように両者を機械的に結合する。
【0022】
g.可動型7が後退(型開き)する。裏側部材3はスライド型14に固着した状態にあり、表側部材2は裏側部材3に結合されている。第1スプルー10及びゲート16部分の樹脂が除去される。
【0023】
h.突き出しピン17が前方(図中右側方向)へ突き出され、成形体であるアームレスト1が型から外される。
【0024】
i.可動型7が図中下方へスライドされ、元の位置に復帰する。かくして1回目の成形工程が終了し、2回目の成形工程の開始待機状態となる。
上記実施形態においては、裏側部材3を表側部材2の内側に入り込ませ、表側部材2の端部に内側に突出する係合部5を形成して、これにより裏側部材3を包み込むように結合させた中空成形体、一例としてアームレスト1を挙げて説明したが、表側部材2と裏側部材3との間に、空間を形成しない構造、すなわち表側部材2と裏側部材3とが密着した構造においても上記方法により結合構造とすることができる。
【0025】
さらに、表側部材2に対し裏側部材3が、表側部材2後方に突き出て全体として膨らんだ構造であっても、裏側部材3の端部が表側部材2の内側に当接する構造であれば、係合部5の形成により、裏側部材3を表側部材2に結合させることができる。
【0026】
【発明の効果】
本発明(請求項1)は、表側部材に形成された係合部により、裏側部材を係合固定するものであるから、表側部材と裏側部材を接着させる接続用樹脂が不要となる。また表側部材及び裏側部材は機械的に係合しているのみであるから、いずれかあるいは両方の部材を弾性変形させることにより、係合を外し、両者を分離することができる。これにより、一方の部材が破損した場合あるいは成形不良品であった場合等、その部材のみの交換が可能となる。通常の射出成形法では、表側部材と裏側部材を別々に成形した後、両者結合されるが、本発明にあっては、両部材は成形と同時に係合結合されるから、別途独立の結合工程は不要となる。
【0027】
本発明(請求項2)によれば、中空空間の存在により、成形体を軽量化することができ、特に自動車用部品に適用して有効である。
【0028】
本発明(請求項3)によれば、表側部材に人体が接触したとき、軟らかい感触とすることができる。また表側部材と裏側部材との間に空間があれば、表側部材の軟らかい感触をより一層増すことができる。
【0029】
本発明(請求項4)によれば、1次成形により表側部材及び裏側部材が同時に成形され、2次成形により係合部が表側部材と一体的に形成され、この係合部材にて裏側部材を機械的に結合させることができるから、別の接続用樹脂は不要となり、表側部材及び裏側部材の接着を考慮することなく、それぞれの樹脂材料を選択することができる。
【0030】
本発明(請求項5)によれば、最後に成形体が固着するスライド型に突き出しピンを設けることにより、成形体を確実に型から外すことができる。
【図面の簡単な説明】
【図1】本発明の実施の形態にかかる成形体であるアームレストを示す斜視図である。
【図2】図1のA−A線断面図である。
【図3】成形方法を工程順に説明するための金型断面図であり、型閉じ工程時を示す。
【図4】同じく一次射出成形工程時の金型断面図である。
【図5】同じく型開き工程時の金型断面図である。
【図6】同じくダイスライド,コア突出し工程時の金型断面図である。
【図7】型閉じ工程時の金型断面図である。
【図8】同じく二次射出成形工程時の金型断面図である。
【図9】同じく型開き工程時の金型断面図である。
【図10】同じく製品取り出し工程時の金型断面図である。
【図11】同じくダイスライド,コア戻し工程時の金型断面図である。
【符号の説明】
1…アームレスト
2…表側部材
3…裏側部材
4…空間
5…係合部
6…固定型
7…可動型
8…第1キャビティ
9…第2キャビティ
10…第1スプルー
11…第2スプルー
12…第1ジャンプゲート
13…第2ジャンプゲート
15a…凸部
15b…凹部
16…第3ジャンプゲート
17…突き出しピン
18…係合空間
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an injection molding method using a die slide injection method and a molding die therefor.
[0002]
[Prior art]
Conventionally, a die slide injection method in which two halves are formed by primary molding and an adhesive resin is injected into the ends of the halves by secondary molding to join them together is a method of forming a hollow body. It is known as For example, in Patent Literature 1, when manufacturing a resin hollow product such as a console lid or a spoiler for an automobile, a front side member whose appearance is to be emphasized and a back side member whose appearance can be relatively neglected are superimposed, and hollow by a die slide injection method. A method and mold for forming a body is disclosed.
[0003]
[Patent Document 1]
Japanese Patent Publication No. Hei 8-2554
[Problems to be solved by the invention]
In the above publication, for example, the spoiler is configured such that an upper half body and a lower half body are connected to each other with a joining resin, and the joining resin is composed of an upper half body and a lower half body. It must be a resin that can be adhered to. However, a polyolefin resin widely used as a thermoplastic resin has a problem that it is difficult to adhere to other resins, and that a joining resin is limited. In particular, when the upper half body and the lower half body are made of different materials, the bonding resin for bonding the two is often very limited, which may cause a problem in the bonding strength.
[0005]
The present invention has been made in view of such circumstances, and has been made by injection molding which eliminates the need for a joining resin for bonding by joining two halves by a mechanical engagement mechanism. A method and a molding die thereof are provided.
[0006]
[Means for Solving the Problems]
The present invention (Claim 1) provides a method of injection-molding a front-side member and a back-side member by superimposing a front-side member and a back-side member by a die slide injection method. A primary molding step of opening the movable mold, sliding the movable mold in a direction perpendicular to the mold closing direction, and closing the mold so that the rear member of the movable mold corresponds to the position of the front member of the fixed mold. In the movable mold, a slide mold configured to slide the back member in the mold closing direction is slid a predetermined distance in the fixed mold direction, moved into the front member, and wraps at least an end of the back member. Forming an engagement space, injecting and injecting the same resin as that of the front side member into the engagement space, and integrally forming an engagement portion surrounding the back side member with the front side member; That consists secondary molding process, the back side member by the secondary molding process is intended to be coupled to said front side member.
[0007]
In such a configuration, at the time of secondary molding, the engaging portion is welded to the front side member and is integrally formed therewith. The engagement portion wraps around the end of the back member and mechanically couples it to the front member.
[0008]
In the present invention (claim 2), a hollow space is formed between the front side member and the back side member. In such a configuration, the molded body is reduced in weight by adopting a hollow body structure.
[0009]
In the present invention (claim 3), the front member is made of a soft resin material, and the back member is made of a hard resin material. In such a configuration, since the surface is soft and the back side is hard, it is possible to manufacture a molded body that is hardly deformed as a whole. In addition, by adopting a hollow body structure, the front side member has a high degree of freedom of deformation, and has a softer feel.
[0010]
According to the molding die of the present invention (claim 4), the first and second molds for injecting and injecting resin into one surface of the first and second cavities forming the front member and the back member and the first and second cavities are provided. A fixed mold having two sprues, having the other surface of the first and second cavities, these surfaces being made to correspond to one surface of the first and second cavities of the fixed mold, In addition to the primary molding of the back member, the second surface of the second cavity is made to correspond to the one surface of the first cavity of the fixed mold, and the secondary molding for joining the front member and the back member is performed. A movable mold that forms the other surface of the second cavity of the movable mold, is slidably supported in a mold closing direction, and slides a predetermined distance during the secondary molding to move the back side member to the above-described state. Inside front member The moved, those composed of a slide type that forms an engagement space encasing the back member.
[0011]
In such a configuration, molten resin is injected and injected into the first and second cavities via the first and second sprues, respectively, to form the front member and the back member (primary molding). Next, the movable mold is opened, slid in the direction perpendicular to the mold closing direction, the back member is made to correspond to the first cavity, and the mold is closed. The slide mold is slid into the first cavity by a predetermined distance to form an engagement space, and the same resin as the front side member is injected and injected into the space via the first sprue, and the engagement portion integrated with the front side member is formed. Is formed (secondary molding). The engagement portion engages so as to wrap the end of the back member, and couples the back member to the front member.
[0012]
In the present invention (claim 5), the slide die is formed with a protruding pin of the molded body. In this configuration, after the completion of the secondary molding, the molded body fixed to the slide mold is removed from the mold by the ejection of the ejection pin.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment will be described with respect to an automobile armrest.
1 and 2, reference numeral 1 denotes an armrest, which includes a front member 2 made of a soft resin such as a soft PVC (polyvinyl chloride resin) and a back member 3 made of a hard resin such as a polypropylene resin. 4 are formed. Reference numeral 5 denotes an engaging portion formed integrally with the end of the front member 2 and is engaged so as to wrap the back member 3, whereby the two members are mechanically connected. In such a structure, the back side member 3 can be separated by elastically deforming the engaging portion 5 of the front side member 2. A plurality of ribs or projections (not shown) are provided at appropriate intervals inside the back side member 3 to maintain the surface shape of the front side member 2 and the hollow space 4. By changing the interval and size (thickness) of the ribs or projections, the soft feeling can be adjusted. Since the armrest 1 is a member on which the occupant places his or her arm, the front member 2 is desirably a soft material, and the inside thereof is a hollow space 4 to further improve the softness. In addition, a sponge can be insert-molded in this hollow space. Since the back side member 3 is a member fixed to the door, it is preferable that the back side member 3 be hard from the viewpoint of the mounting workability, the shape maintaining property, and the like.
[0014]
Next, a method of forming the armrest 1 having such a structure will be described with reference to FIGS.
[0015]
a. The state where the fixed mold 6 and the movable mold 7 are closed is shown. The fixed mold 6 is fixed to an injection molding machine (not shown), and the movable mold 7 is configured to slide in the mold opening direction, the mold closing state, and the mold closing direction in the mold opening direction in the mold opening state. Reference numerals 8 and 9 denote first cavities and second cavities formed between the dies 6 and 7 and arranged vertically in the figure. The front member 2 and the back member 3 are molded respectively. The fixed mold 6 forms one surface s of the first and second cavities 8 and 9, and the movable mold 7 forms the other surface t of the first and second cavities 8 and 9. Reference numerals 10 and 11 denote first and second sprues formed on the fixed die 6, and 12 and 13 denote first and second sprues provided on the movable die 7 corresponding to the first and second sprues 10 and 11. Two jump gates are for injecting resin into the first and second cavities 8 and 9, respectively.
[0016]
Reference numeral 14 denotes a slide die supported in the movable die 7 so as to be slidable by a predetermined distance in the die closing direction, and constitutes the other surface t of the second cavity 9. The illustrated state shows a case where the slide mold 14 has retreated (moved to the left in the figure). In this state, the second cavity 9 forms a space corresponding to the shape of the back side member 3. Reference numeral 15a denotes a convex portion formed at the rear end of the slide die 14, and 15b denotes a concave portion formed on the movable die 7 side with which the convex portion 15a engages. The sliding of the slide die 14 with respect to the movable die 7 is restricted by the movement of the convex portion 15a in the concave portion 15b. Reference numeral 17 denotes a protruding pin formed in the slide mold 14, and the molded body is removed from the movable mold 7 by the protruding of the pin 17 after molding.
[0017]
b. In the mold closed state, the soft resin and the hard resin are heated and melted into the first and second cavities 8 and 9 via the first and second sprues 10 and 11 and the first and second jump gates 12 and 13, respectively. Injection injection (primary molding).
[0018]
c. The movable mold 7 retreats (moves leftward in the figure) and is opened. The resin on the sprue, runner and gate is removed. At this time, the front member 2 is fixed to one surface s (fixed mold side surface) of the first cavity 8 and the back member 3 is fixed to the other surface t (slide mold surface) of the second cavity 9.
[0019]
d. The movable mold 7 is slid in the direction perpendicular to the mold closing direction (upward in the figure), and the back surface 3 fixing surface s of the slide mold 14 is moved to a position facing the first cavity 8.
[0020]
e. The movable mold 7 moves forward (moves rightward in the figure) and is closed. At this time, the slide die 14 is simultaneously slid forward (to the right in the drawing) until the projection 15a hits the wall surface of the recess 15b, and pushes the back member 3 into the first cavity 8. As a result, the back member 3 moves inside the front member 2, and the upper side surface p in the drawing and the lower end q in the drawing contact the inside of the front member 2. At this time, a space 18 is maintained between the front member 2 and the back member 3. By the sliding of the slide die 14, an engagement space 18 is formed at a portion in contact with the front side member 2 with which the third jump gate 16 formed on the movable die 7 communicates.
[0021]
f. The third jump gate 16 is located at a position facing the first sprue 10, and the same resin material as that of the front member 2 is injected and injected into the engagement space 18 via these (secondary molding). Thereby, the engaging portion 5 is integrally formed at the end of the front member 2. The engagement portion 5 mechanically couples the two so as to surround the back member 3.
[0022]
g. The movable mold 7 retreats (mold opens). The back member 3 is fixed to the slide die 14, and the front member 2 is connected to the back member 3. The resin on the first sprue 10 and the gate 16 is removed.
[0023]
h. The protruding pin 17 protrudes forward (to the right in the drawing), and the armrest 1 as a molded body is removed from the mold.
[0024]
i. The movable mold 7 is slid downward in the figure and returns to the original position. Thus, the first molding step is completed, and a standby state for starting the second molding step is established.
In the above-described embodiment, the back member 3 is inserted into the inside of the front member 2, and an engagement portion 5 protruding inward is formed at an end of the front member 2, whereby the back member 3 is joined so as to wrap the back member 3. Although the above description has been given with reference to the hollow molded body, for example, the armrest 1, the above description also applies to a structure in which no space is formed between the front member 2 and the back member 3, that is, a structure in which the front member 2 and the back member 3 are in close contact with each other. Depending on the method, a coupling structure can be obtained.
[0025]
Furthermore, even if the rear member 3 projects rearward from the front member 2 and bulges out as a whole, as long as the end of the rear member 3 is in contact with the inside of the front member 2, there is no problem. The formation of the joint portion 5 allows the back member 3 to be coupled to the front member 2.
[0026]
【The invention's effect】
In the present invention (claim 1), the back side member is engaged and fixed by the engaging portion formed on the front side member, so that a connecting resin for bonding the front side member and the back side member is unnecessary. Further, since the front side member and the back side member are only mechanically engaged, the engagement can be released and the two members can be separated by elastically deforming one or both members. This makes it possible to replace only one of the members, such as when one of the members is damaged or the molded product is defective. In a normal injection molding method, the front side member and the back side member are separately molded and then joined. However, in the present invention, since both members are engaged and joined simultaneously with molding, a separate independent joining step is performed. Becomes unnecessary.
[0027]
According to the present invention (claim 2), the molded article can be reduced in weight due to the existence of the hollow space, and is particularly effective when applied to automobile parts.
[0028]
According to the present invention (claim 3), when a human body comes into contact with the front side member, a soft touch can be provided. If there is a space between the front member and the back member, the soft feel of the front member can be further increased.
[0029]
According to the present invention (claim 4), the front side member and the back side member are simultaneously formed by primary molding, and the engaging portion is integrally formed with the front side member by secondary molding, and the back side member is formed by this engaging member. Can be mechanically connected, so that another connecting resin is not required, and each resin material can be selected without considering the adhesion of the front side member and the back side member.
[0030]
According to the present invention (claim 5), the molded body can be reliably removed from the mold by providing the protrusion pins on the slide mold to which the molded body is finally fixed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an armrest as a molded body according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a sectional view of a mold for explaining a molding method in the order of steps, showing a mold closing step.
FIG. 4 is a sectional view of a mold during a primary injection molding step.
FIG. 5 is a sectional view of a mold during a mold opening step.
FIG. 6 is a sectional view of a die during a die slide and core protruding step.
FIG. 7 is a sectional view of a mold at the time of a mold closing step.
FIG. 8 is a sectional view of a mold during a secondary injection molding step.
FIG. 9 is a sectional view of a mold during a mold opening step.
FIG. 10 is a sectional view of a mold at the time of a product removal step.
FIG. 11 is a cross-sectional view of a die during a die slide and core return step.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Armrest 2 ... Front side member 3 ... Back side member 4 ... Space 5 ... Engaging part 6 ... Fixed mold 7 ... Movable mold 8 ... 1st cavity 9 ... 2nd cavity 10 ... 1st sprue 11 ... 2nd sprue 12 ... No. 1 jump gate 13 second jump gate 15a convex portion 15b concave portion 16 third jump gate 17 projecting pin 18 engagement space

Claims (5)

表側部材と裏側部材とを重ね合わせてダイスライドインジェクション法により射出成形する方法において、
固定型及び可動型を用いて上記表側部材及び裏側部材を樹脂にて射出成形する1次成形工程、
上記可動型を型開きし型閉じ方向に対し垂直方向にスライドさせて上記可動型の上記裏側部材を上記固定型の上記表側部材の位置に対応させて型閉じする工程、上記可動型において、上記裏側部材を型閉じ方向にスライドする構造としたスライド型を上記固定型方向に所定距離スライドさせて、上記表側部材内に移動させ、上記裏側部材の少なくとも端部を包みこむ係合空間を形成する工程、
上記係合空間に上記表側部材と同一樹脂を射出注入して、上記裏側部材を包み込む係合部を上記表側部材と一体化させて形成する2次成形工程、
よりなり、該2次成形工程により上記裏側部材を上記表側部材に結合させることを特徴とする射出成形方法。
In the method of injection molding by a die slide injection method by superimposing the front side member and the back side member,
A primary molding step of injection molding the front side member and the back side member with a resin using a fixed mold and a movable mold;
A step of closing the movable mold by opening the mold and sliding the movable member in the direction perpendicular to the mold closing direction so that the back member of the movable mold corresponds to the position of the front member of the fixed mold; A slide die having a structure in which the back side member is slid in the mold closing direction is slid a predetermined distance in the fixed die direction and moved into the front side member to form an engagement space that wraps at least an end of the back side member. Process,
A secondary molding step of injecting and injecting the same resin as the front side member into the engagement space, and integrally forming an engagement portion surrounding the back side member with the front side member;
An injection molding method, wherein the back member is joined to the front member by the secondary molding step.
上記表側部材と上記裏側部材の間に中空空間が形成されてなることを特徴とする請求項1記載の射出成形方法2. The injection molding method according to claim 1, wherein a hollow space is formed between the front side member and the back side member. 上記表側部材が軟質樹脂材料にて、上記裏側部材が硬質樹脂材料にて構成されることを特徴とする請求項1または2記載の射出成形方法。3. The injection molding method according to claim 1, wherein the front member is made of a soft resin material, and the back member is made of a hard resin material. 表側部材及び裏側部材を形成する第1及び第2キャビティの一方の面及び該第1及び第2キャビティに樹脂を射出注入する第1及び第2スプルーを有する固定型、
上記第1及び第2キャビティの他方の面を有し、これらの面が上記固定型の上記第1及び第2キャビティの一方の面に対応せしめられて上記表側部材及び裏側部材を1次成形するとともに、上記第2キャビティの他方の面が上記固定型の上記第1キャビティの一方の面に対応せしめられて上記表側部材と裏側部材を結合するための2次成形をする可動型、
該可動型の上記第2キャビティの他方の面を構成する型であって、型閉じ方向にスライド可能に支持され、上記2次成形のとき所定距離スライドさせて上記裏側部材を上記表側部材内に移動させ、上記裏側部材を包み込む係合空間を形成するスライド型、
よりなる成形金型。
A fixed mold having one surface of the first and second cavities forming the front side member and the back side member and first and second sprues for injecting and injecting resin into the first and second cavities;
It has the other surface of the first and second cavities, and these surfaces are made to correspond to the one surface of the first and second cavities of the fixed mold, and the front side member and the back side member are primarily formed. A movable mold for performing secondary molding for coupling the front side member and the back side member, wherein the other surface of the second cavity is made to correspond to one surface of the first cavity of the fixed mold;
A mold that constitutes the other surface of the second cavity of the movable mold, is slidably supported in a mold closing direction, and slides a predetermined distance during the secondary molding to move the back member into the front member. A slide type for moving and forming an engagement space enclosing the back side member,
Forming mold.
上記スライド型に成形体の突き出しピンが形成されてなる請求項4記載の成形金型。The molding die according to claim 4, wherein a protrusion pin of the molded body is formed on the slide die.
JP2003023927A 2003-01-31 2003-01-31 INJECTION MOLDING METHOD AND MOLDING MOLD THEREOF Expired - Fee Related JP4037279B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003023927A JP4037279B2 (en) 2003-01-31 2003-01-31 INJECTION MOLDING METHOD AND MOLDING MOLD THEREOF

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003023927A JP4037279B2 (en) 2003-01-31 2003-01-31 INJECTION MOLDING METHOD AND MOLDING MOLD THEREOF

Publications (2)

Publication Number Publication Date
JP2004230794A true JP2004230794A (en) 2004-08-19
JP4037279B2 JP4037279B2 (en) 2008-01-23

Family

ID=32952595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003023927A Expired - Fee Related JP4037279B2 (en) 2003-01-31 2003-01-31 INJECTION MOLDING METHOD AND MOLDING MOLD THEREOF

Country Status (1)

Country Link
JP (1) JP4037279B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008221565A (en) * 2007-03-12 2008-09-25 Japan Steel Works Ltd:The Molding-assembly method to obtain composite molding in mold and mold for molding-assembly
FR2980428A1 (en) * 2011-09-23 2013-03-29 Peugeot Citroen Automobiles Sa Plastic protection panel for protecting e.g. side doors of car from urban shock, has rigid wall whose one of faces comprises fixing unit for fixing rigid wall at body portion and flexible wall for covering another face of rigid wall
CN106003601A (en) * 2016-05-19 2016-10-12 宁波方正汽车模具有限公司 Inclined core pulling mechanism of automobile armrest mould

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0542559A (en) * 1991-08-14 1993-02-23 Japan Steel Works Ltd:The Method for molding hollow body and mold for it
JPH0584771A (en) * 1991-09-25 1993-04-06 Japan Steel Works Ltd:The Method and mold for producting hollow object
JPH07156199A (en) * 1993-10-27 1995-06-20 Ckd Corp Resin molding device
JP2000167885A (en) * 1998-12-09 2000-06-20 Japan Steel Works Ltd:The Method for molding hollow product and mold for molding
JP2002018898A (en) * 2000-07-11 2002-01-22 Osawa Wax Kk Hollow holding and method for producing hollow molding

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0542559A (en) * 1991-08-14 1993-02-23 Japan Steel Works Ltd:The Method for molding hollow body and mold for it
JPH0584771A (en) * 1991-09-25 1993-04-06 Japan Steel Works Ltd:The Method and mold for producting hollow object
JPH07156199A (en) * 1993-10-27 1995-06-20 Ckd Corp Resin molding device
JP2000167885A (en) * 1998-12-09 2000-06-20 Japan Steel Works Ltd:The Method for molding hollow product and mold for molding
JP2002018898A (en) * 2000-07-11 2002-01-22 Osawa Wax Kk Hollow holding and method for producing hollow molding

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008221565A (en) * 2007-03-12 2008-09-25 Japan Steel Works Ltd:The Molding-assembly method to obtain composite molding in mold and mold for molding-assembly
FR2980428A1 (en) * 2011-09-23 2013-03-29 Peugeot Citroen Automobiles Sa Plastic protection panel for protecting e.g. side doors of car from urban shock, has rigid wall whose one of faces comprises fixing unit for fixing rigid wall at body portion and flexible wall for covering another face of rigid wall
CN106003601A (en) * 2016-05-19 2016-10-12 宁波方正汽车模具有限公司 Inclined core pulling mechanism of automobile armrest mould

Also Published As

Publication number Publication date
JP4037279B2 (en) 2008-01-23

Similar Documents

Publication Publication Date Title
JP2004001424A (en) Injection molding method, injection mold, resin molded product and insert resin part
US5804117A (en) Molding method for resin articles
JP2004230794A (en) Injection molding method and its molding mold
JP2005280227A (en) Molding method for vehicular interior part made of resin
JP3051901B2 (en) Injection mold for composite molding
JP2001205681A (en) Mold for molding hollow product and method for molding
JP3012914B2 (en) Hollow product made of synthetic resin by injection molding method and method for producing the same
JP3203870B2 (en) Method of manufacturing resin products
JP3665033B2 (en) Injection molding method of composite molded product and its mold
JP4394795B2 (en) Injection molding method
JP2004017629A (en) Molding method for resin molded body
JP3611977B2 (en) Method for molding hollow body product and mold for molding
JP2009226889A (en) Injection foaming molded article, injection foaming mold, and manufacturing method of injection foaming molded article
JPH10264202A (en) Production of composite synthetic resin molded product
JPH0834031A (en) Mold for molding hollow molded product
JP2004136532A (en) Method for injection-molding multi-layer hollow body, and mold for injection molding
JP3938433B2 (en) Instrument panel manufacturing method
JP2701681B2 (en) Method for producing resin molded product and molding die apparatus
KR20050092798A (en) Runner device for in-mold forming
JP2976264B2 (en) Injection molding method of three-layer structure molded article and its mold
JP3759587B2 (en) Injection molding of interior material for vehicle with integrated skin and injection molding method for interior material for vehicle with integrated skin
JP2006015635A (en) Skinned foamed resin member and its manufacturing method
JP2804992B2 (en) Toothbrush main body and secondary molding device thereof
JPH07276422A (en) Molding method of resin molded article, and mold therefor
JP2001138373A (en) Injection molding method and injection mold

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060116

TRDD Decision of grant or rejection written
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20071024

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20071030

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20071031

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101109

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111109

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111109

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121109

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121109

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131109

Year of fee payment: 6

LAPS Cancellation because of no payment of annual fees