JP2960347B2 - Molding method for hollow resin products - Google Patents
Molding method for hollow resin productsInfo
- Publication number
- JP2960347B2 JP2960347B2 JP6063696A JP6063696A JP2960347B2 JP 2960347 B2 JP2960347 B2 JP 2960347B2 JP 6063696 A JP6063696 A JP 6063696A JP 6063696 A JP6063696 A JP 6063696A JP 2960347 B2 JP2960347 B2 JP 2960347B2
- Authority
- JP
- Japan
- Prior art keywords
- hollow resin
- mold
- resin product
- wall
- core
- 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 - Lifetime
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【0001】[0001]
【発明の属する技術分野】この発明は、中空樹脂製品の
成形方法、特に対抗力の弱い外壁の中空樹脂製品の成形
方法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 for forming a hollow resin product, and more particularly to a method for forming a hollow resin product having an outer wall having a low resistance.
【0002】[0002]
【従来の技術】中空樹脂製品の射出成形方法は広く用い
られているが、その内、外壁に凹凸部を有する中空樹脂
製品の射出成形金型は、図20の如く可動金型Bを構成
するスライドコアB1,B2と、該スライドコアB1,
B2の接合面、即ち、分割線L(パーティグラインとも
称する)に沿って保持する中子RにてキャビティCを形
成するもので、キャビティCに充填した溶融樹脂Dが適
宜固化した所で可動金型Bを切離すと共に、スライドコ
アB1,B2を型開きし、中空樹脂製品1に中子Rが嵌
挿する状態で露出し、その中空樹脂製品1の端面1aを
固定板b1にて中子Rの長手方向に押圧し、中子Rより
抜取っていた。2. Description of the Related Art Injection molding methods for hollow resin products are widely used. Among them, an injection molding die for a hollow resin product having an uneven portion on an outer wall constitutes a movable mold B as shown in FIG. The slide cores B1, B2 and the slide cores B1,
The cavity C is formed by the core R held along the joining surface of B2, that is, the dividing line L (also referred to as a parting line). When the molten resin D filled in the cavity C is appropriately solidified, the movable metal The mold B is separated and the slide cores B1 and B2 are opened to expose the core R in a state where the core R is inserted into the hollow resin product 1, and the end face 1a of the hollow resin product 1 is fixed to the core with the fixing plate b1. It was pressed in the longitudinal direction of R and pulled out of the core R.
【0003】[0003]
【発明が解決しようとする課題】合成樹脂の材質や製品
形状によって多少異なるが、一般に、厚肉外壁に凹凸部
を有する中空樹脂製品にあっては、中子の支承部に外壁
の肉厚に相当する筒体を嵌挿しておき、中空樹脂製品の
取出し時に、中空樹脂製品の端面を押し出せば、中空樹
脂製品を容易に取出すことはできるが、薄肉外壁の中空
樹脂製品、例えば貫通孔を有する外壁の中空樹脂製品、
網目状外壁の中空樹脂製品にあっては、外壁の対抗力が
弱いので、中空樹脂製品の端面を押圧して取出すと、外
壁が座屈変形する等の問題点があった。Although there are some differences depending on the material and the product shape of the synthetic resin, in general, in the case of a hollow resin product having an uneven portion on the thick outer wall, the thickness of the outer wall is increased at the support portion of the core. If the corresponding cylindrical body is inserted and inserted and the end face of the hollow resin product is pushed out when taking out the hollow resin product, the hollow resin product can be easily taken out. Having an outer wall hollow resin product,
In the case of a hollow resin product having a mesh-shaped outer wall, there is a problem that the outer wall is buckled and deformed when the end surface of the hollow resin product is taken out by pressing, since the opposing force of the outer wall is weak.
【0004】また中子に抜き勾配を設ければ、中空樹脂
製品からの中子の抜取りが容易になるが、中子に抜き勾
配を設けた場合、中空部長さが長くなるほど、中子の先
部寸法と基部寸法との差が大きくなり、外壁の肉厚が不
均一になる問題点があった。上記問題点を改善するため
に同一径の中子(抜き勾配のない中子)を用いると、中
子の抜取り抵抗が大きくなる問題点があった。そこでこ
の発明は、従来技術の有するこのような問題点に鑑みて
なされたものであり、その目的とするところは、対抗力
の弱い外壁の中空樹脂製品であっても損傷することなく
高精度に、しかも簡単に形成する成形方法を提供するこ
とにある。If the core is provided with a draft, it is easy to remove the core from the hollow resin product. However, if the core is provided with a draft, the longer the hollow portion is, the more the tip of the core becomes. There is a problem that the difference between the part size and the base part size becomes large and the thickness of the outer wall becomes uneven. If cores of the same diameter (cores without draft) are used to improve the above problem, there is a problem that the core withdrawal resistance increases. Therefore, the present invention has been made in view of such problems of the prior art, and the object thereof is to provide a high precision without damaging even a hollow resin product having an outer wall having a weak resistance. Another object of the present invention is to provide a molding method which can be easily formed.
【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、本発明による中空樹脂製品の成形方法は、請求項1
として、少なくとも二分割された分割金型壁と、分割金
型壁の分割線に沿って保持する中子とで中空樹脂製品の
キャビティを形成し、キャビティ内で形成された対抗力
の弱い外壁の中空樹脂製品の取出工程を、一方の分割金
型で中空樹脂製品の製品長さと直交する横断面の1/2
以下を、製品長さに渡り保持して型開きする第一工程
と、一方の分割金型に保持されている中空樹脂製品から
中子を完全に抜取る第二工程と、一方の分割金型から中
空樹脂製品を型締め方向に突き出す第三工程とから構成
した。To achieve the above object, a method for molding a hollow resin product according to the present invention is described in claim 1.
As at least two divided mold walls, and a core held along the dividing line of the divided mold wall, form a cavity of the hollow resin product, and form an outer wall with a weak opposing force formed in the cavity. The removal process of the hollow resin product is performed by using one of the split molds as a half of the cross section orthogonal to the product length of the hollow resin product.
The following, a first step of opening the mold while holding it over the product length, a second step of completely removing the core from the hollow resin product held in one of the split molds, and one of the split molds And a third step of projecting the hollow resin product from the mold in the mold clamping direction.
【0006】請求項2として、少なくとも二分割された
分割金型壁と、分割金型壁の分割線に沿って保持する中
子とで中空樹脂製品のキャビティを形成し、キャビティ
内で形成された対抗力の弱い外壁の中空樹脂製品の取出
工程を、一方の分割金型で中空樹脂製品の製品長さと直
交する横断面の1/2以下を、製品長さに渡り保持して
型開きする第一工程と、他方の分割金型が外壁の凹凸部
に係止している型開き初期に、中空樹脂製品より中子を
完全に抜取る第二工程と、中子の抜取り後に型開きを再
開する第三工程と、一方の分割金型から中空樹脂製品を
型締め方向に突き出す第四工程から構成した。According to a second aspect of the present invention, a cavity of a hollow resin product is formed by at least two divided mold walls and a core held along a dividing line of the divided mold wall, and formed inside the cavity. The step of taking out the hollow resin product of the outer wall having a weaker opposing force is performed by opening the mold while holding one half or less of the cross section orthogonal to the product length of the hollow resin product in one split mold over the product length. One step and the second step of completely removing the core from the hollow resin product at the beginning of the mold opening when the other split mold is locked to the uneven portion of the outer wall, and restarting the mold opening after the core is removed And a fourth step of projecting the hollow resin product from one of the split molds in the mold clamping direction.
【0007】[0007]
【発明の実施の形態】先ず本発明による成形金型の基本
構造を、図1乃至図3の如く二分割式の成形金型に基づ
き説明すれば、成形金型5は固定側分割金型51と、可
動側分割金型52と、両分割金型51,52の分割線L
に沿って保持する中子6によりキャビティCを形成し、
キャビティCにて形成した中空樹脂製品1を保持して離
型する一方の分割金型5aに突出ピン7を出入り可能に
嵌挿すると共に、型開きの初期に、分割金型51,52
を少しだけ切離す離反手段8を設けている。固定側分割
金型51は中空樹脂製品1の製品長さHと直交する横断
面の半分に相当するキャビティCを形成し、可動側分割
金型52は残り半分のキャビティCを形成している。中
空樹脂製品1は、基体2の内部に成形金型5の分割線L
に平行する中空部4を穿設し、基体2は対抗力の弱い外
壁21に、型開き方向に平行する凹凸部3を形成するも
ので、凹凸部3は製品長さHの全長に形成するか、製品
長さHの一定範囲に形成し、或いは外壁21に分散形成
するものであり、且つ分割金型51,52の分割線Lを
境にして、一方の分割金型5a側と他方の分割金型5b
側の何れかに設けるか、両分割金型51,52側に設け
るものである。また中空部4は中空部長さhを中空内部
寸法Sより大きく形成し、主に中空樹脂製品1の中心に
設けるものであるが、図15の如く一方に偏って設ける
ことも可能であるし、2つ以上を平行に設けることも可
能である。中子6は中空部4の中空部長さhと中空内部
寸法Sに応じて形成するもので、分割線Lと平行するよ
うに配設し、機械的に、或いはシリンダーにより往復動
するものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the basic structure of a molding die according to the present invention will be described with reference to a two-part molding die as shown in FIGS. And the movable-side split mold 52, and the dividing line L between the two split molds 51 and 52.
A cavity C is formed by the core 6 held along
The protruding pin 7 is removably inserted into one of the split molds 5a for holding and releasing the hollow resin product 1 formed in the cavity C, and the split molds 51, 52 are formed at the beginning of the mold opening.
Is slightly separated. The fixed-side split mold 51 forms a cavity C corresponding to a half of a cross section orthogonal to the product length H of the hollow resin product 1, and the movable-side split mold 52 forms the other half cavity C. The hollow resin product 1 includes a dividing line L of a molding die 5 inside a base 2.
The base 2 forms an uneven portion 3 parallel to the mold opening direction on the outer wall 21 having a weak opposing force, and the uneven portion 3 is formed over the entire length H of the product. Or, it is formed in a fixed range of the product length H or is formed dispersedly on the outer wall 21, and one dividing mold 5 a side and the other dividing mold 5 are separated by the dividing line L of the dividing molds 51 and 52. Split mold 5b
Side, or provided on both split molds 51, 52 side. The hollow portion 4 is formed such that the length h of the hollow portion is larger than the internal size S of the hollow portion and is mainly provided at the center of the hollow resin product 1. However, the hollow portion 4 may be provided on one side as shown in FIG. It is also possible to provide two or more in parallel. The core 6 is formed in accordance with the length h of the hollow portion of the hollow portion 4 and the internal dimension S of the hollow portion, and is disposed so as to be parallel to the dividing line L, and reciprocates mechanically or by a cylinder. .
【0008】次に、本発明による中空樹脂製品の第一成
形方法を図1と図16,17に基づいて説明すれば、図
1(A)の如く少なくとも二分割された分割金型51,
52と、分割金型51,52の分割線Lに沿って保持す
る中子6とで中空樹脂製品1のキャビティCを形成し、
該キャビティCに図1(B)の如く溶融樹脂Dを充填
し、キャビティC内で図1(C)の如く冷却固化した定
対抗力の弱い外壁2の中空樹脂製品1の取出工程を、図
1(D)の如く一方の分割金型5aで中空樹脂製品1の
製品長さHと直交する横断面の1/2以下を、製品長さ
Hに渡り保持して型開きする第一工程と、図1(E)の
如く一方の分割金型5aに保持されている中空樹脂製品
1から中子6を完全に抜取る第二工程と、図1(F)の
如く一方の分割金型5aから中空樹脂製品1を型締め方
向に突き出す第三工程とから構成したものである。Next, a first molding method of a hollow resin product according to the present invention will be described with reference to FIGS. 1 and 16 and 17. As shown in FIG.
A cavity C of the hollow resin product 1 is formed by the core 52 and the core 6 held along the division line L of the division molds 51 and 52,
FIG. 1B shows a process of taking out the hollow resin product 1 of the outer wall 2 having a low constant resistance, which is filled with the molten resin D in the cavity C and cooled and solidified in the cavity C as shown in FIG. 1 (D), a first step of holding a half or less of a cross section orthogonal to the product length H of the hollow resin product 1 with the one split mold 5a over the product length H and opening the mold. A second step of completely removing the core 6 from the hollow resin product 1 held in one of the split molds 5a as shown in FIG. 1 (E), and one of the split molds 5a as shown in FIG. And a third step of projecting the hollow resin product 1 from the mold in the mold clamping direction.
【0009】本発明による中空樹脂製品の第二成形方法
を図2と図3、及び図18,19に基づき説明すれば、
少なくとも二分割された分割金型51,52と、分割金
型51,52の分割線Lに沿って保持する中子6とで中
空樹脂製品1のキャビティCを形成し、図2(A)の如
くキャビティC内で形成された対抗力の弱い外壁2の中
空樹脂製品1の取出工程を、図2(B)の如く一方の分
割金型5aで中空樹脂製品1の製品長さHと直交する横
断面の1/2以下を、製品長さHに渡り保持して型開き
する第一工程と、図2(C)の如く他方の分割金型5b
が外壁2の凹凸部(3)に係止している型開き初期に、
中空樹脂製品1より中子6を完全に抜取る第二工程と、
図3(A)の如く中子6の抜取り後に型開きを再開する
第三工程と、図3(B)の如く一方の分割金型5aから
中空樹脂製品1を型締め方向に突き出す第四工程から構
成したものである。即ち、第二成形方法は、成形金型5
の型開きから中空樹脂製品1を突出するまで、一方の分
割金型5aにて中空樹脂製品1を保持し、他方の分割金
型5bが中空樹脂製品1に係止している型開き初期、即
ち、他方の分割金型5bが中空樹脂製品1の凹凸部3に
今だ係止している状態で中子6を完全に抜取り、中子6
の抜取り後に型開きを再開し、最後に一方の分割金型5
aより中空樹脂製品1を突出ピン7にて突出するもので
ある。The second method for molding a hollow resin product according to the present invention will be described with reference to FIGS. 2 and 3 and FIGS.
A cavity C of the hollow resin product 1 is formed by at least two divided molds 51 and 52 and a core 6 held along the dividing line L of the divided molds 51 and 52, and a cavity C of FIG. As shown in FIG. 2 (B), the step of taking out the hollow resin product 1 of the outer wall 2 having a low opposing force formed in the cavity C is orthogonal to the product length H of the hollow resin product 1 by one of the split molds 5a. A first step of holding a half or less of the cross section over the product length H and opening the mold, and the other split mold 5b as shown in FIG.
Is locked in the uneven portion (3) of the outer wall 2,
A second step of completely removing the core 6 from the hollow resin product 1;
A third step of reopening the mold after the core 6 is removed as shown in FIG. 3A, and a fourth step of projecting the hollow resin product 1 from one of the split molds 5a in the mold clamping direction as shown in FIG. 3B. It consists of. That is, the second molding method uses the molding die 5
From the opening of the mold, the hollow resin product 1 is held by one split mold 5a until the hollow resin product 1 protrudes, and the other mold 5b is engaged with the hollow resin product 1 at the initial stage of opening. That is, the core 6 is completely removed in a state where the other split mold 5b is still engaged with the concave-convex portion 3 of the hollow resin product 1, and the core 6
After the removal of the mold, the mold opening is restarted.
The hollow resin product 1 is projected from a by a projecting pin 7.
【0010】[0010]
【実施例】本発明の成形方法による中空樹脂製品1は、
基体2の横断面が円筒形に限定されるものではなく、図
13と図14の如く左右対称形状、又は上下対称形状の
楕円形、正方形、矩形、多角形は勿論、多分割で形成し
得るものであれば、如何なる形状でもよい。中空樹脂製
品1の形状を中空部4の状態で区分すると、図4(A)
と図5と図7の如く外壁21の一端に中空部4を塞ぐ底
部22を設け、一方に向けて開口する片口中空部41
と、図4(B)と図6と図8の如く外壁21内の途中に
中空部4を遮る仕切部23を設け、仕切部23を介して
両方向に開口する両口中空部42と、図4(C)と図9
乃至図11の如く貫通状態に穿設する貫通中空部43に
区分される。外壁21に設ける凹凸部3として、外壁2
1の表面から外壁厚さt内に食込む凹溝部31と、外壁
厚さt方向に貫通する貫通孔32と、外壁21の表面か
ら外側に突出する突条部33とがあり、凹溝部31と貫
通孔32、及び突条部33の大きさと形状は任意である
が、何れも分割金型51,52の型開き方向に平行して
いる。DESCRIPTION OF THE PREFERRED EMBODIMENTS A hollow resin product 1 according to the molding method of the present invention is
The cross section of the base 2 is not limited to a cylindrical shape, and may be formed in a multi-divisional shape, as well as an elliptical shape, a square shape, a rectangular shape, and a polygonal shape, as shown in FIGS. Any shape may be used. When the shape of the hollow resin product 1 is divided by the state of the hollow portion 4, FIG.
5 and 7, one end of the outer wall 21 is provided with a bottom portion 22 for closing the hollow portion 4 and a one-sided hollow portion 41 opening toward one side.
4 (B), FIG. 6 and FIG. 8, a partition 23 for blocking the hollow portion 4 is provided in the middle of the outer wall 21, and a two-port hollow portion 42 opened in both directions through the partition 23. 4 (C) and FIG.
As shown in FIG. 11 to FIG. As the uneven portion 3 provided on the outer wall 21, the outer wall 2
1 has a groove 31 that cuts into the outer wall thickness t from the surface, a through hole 32 penetrating in the direction of the outer wall thickness t, and a ridge 33 protruding outward from the surface of the outer wall 21. Although the size and shape of the through hole 32 and the ridge 33 are arbitrary, they are all parallel to the mold opening direction of the split molds 51 and 52.
【0011】突条部33は中空部4の形成状態、即ち、
片口中空部41や両口中空部42、及び貫通中空部43
に左右されずに、図7の如く何れ中空樹脂製品1の製品
長さHの全長に形成し得るし、凹溝部31も図8の如く
何れの中空樹脂製品1の製品長さHの全長に形成し得
る。また、何れの中空樹脂製品1にあっても、外壁21
の一定範囲に凹溝部31を形成したり、図5の如く外壁
21の一定範囲に貫通孔32を形成したり、図6の如く
外壁21の一定範囲に突条部33を形成することも可能
である。更に、凹溝部31や貫通孔32、或いは突条部
33は、外壁21に分散して形成し得るし、貫通孔32
は底部22まで、或は仕切部23を跨いで形成すること
も可能である。The ridge 33 is formed in a state where the hollow portion 4 is formed, that is,
One-sided hollow portion 41, double-sided hollow portion 42, and through hollow portion 43
7, the groove 31 can be formed over the entire length of the product length H of the hollow resin product 1 as shown in FIG. 7, and the concave groove portion 31 can be formed over the entire length of the product length H of any hollow resin product 1 as shown in FIG. Can be formed. Also, in any hollow resin product 1, the outer wall 21
5, a through-hole 32 can be formed in a certain area of the outer wall 21 as shown in FIG. 5, and a ridge 33 can be formed in a certain area of the outer wall 21 as shown in FIG. It is. Further, the concave groove portion 31, the through hole 32, or the ridge portion 33 can be formed dispersedly on the outer wall 21.
Can be formed up to the bottom portion 22 or straddling the partition portion 23.
【0012】凹溝部31と貫通孔32、及び突条部33
は複合形成することも可能で、例えば図9の如く凹溝部
31と突条部33を個別に複合形成し、或いは突条部3
3に凹溝部31を形成することも可能であるし、図10
の如く貫通孔32と突条部33を個別に複合形成し、或
いは突条部33に貫通孔32を形成することも可能であ
るし、図11の如く凹溝部31と貫通孔32を個別に複
合形成することも可能である。更に図12の如く凹溝部
31と貫通孔32、及び突条部33を個別に複合形成し
たり、その一部を重複して形成することも可能である。The groove 31, the through hole 32, and the ridge 33
Can be formed as a composite. For example, as shown in FIG.
It is also possible to form a concave groove portion 31 in FIG.
It is also possible to separately form the through-hole 32 and the ridge 33 as shown in FIG. 11, or to form the through-hole 32 in the ridge 33, and to separately form the concave groove 31 and the through-hole 32 as shown in FIG. Complex formation is also possible. Further, as shown in FIG. 12, the concave groove portion 31, the through hole 32, and the protruding ridge portion 33 can be individually compounded, or a part thereof can be formed in an overlapping manner.
【0013】中子6を一方の分割金型5a側に配置して
型開きする場合、中子6は一方の分割金型5aと共に中
空樹脂製品1を製品長さHに渡り保持するが、第一成形
方法では、型開き後、一方の分割金型5aにて保持され
ている中空樹脂製品1より完全に抜取られ、第二成形方
法では、一方の分割金型5aにて中空樹脂製品1が保持
され、他方の分割金型5bが今だ中空樹脂製品1に係止
している型開きの初期に、中空樹脂製品1より完全に抜
取られる。When the core 6 is placed on one of the split molds 5a and the mold is opened, the core 6 holds the hollow resin product 1 together with one of the split molds 5a over the product length H. In one molding method, after the mold is opened, the hollow resin product 1 is completely removed from the hollow resin product 1 held by one of the split molds 5a. In the second molding method, the hollow resin product 1 is separated by the one split mold 5a. It is held and the other split mold 5b is completely removed from the hollow resin product 1 at the beginning of the mold opening still locked to the hollow resin product 1.
【0014】成形金型5は三分割以上に構成することも
可能で、成形金型5の構成数によって中空樹脂製品1の
製品長さHと直交する横断面の保持範囲が、例えば1/
3以下、1/4以下になる。四分割に構成する成形金型
5にあっては、例えば図19の如く固定側分割金型52
と可動側分割金型51、及び左右分割金型53,54よ
り構成し、左右分割金型53,54を可動側分割金型5
1と共に型開きし、分割金型52にて中空樹脂製品1の
1/4を保持する状態で中子6を抜取るか、分割金型5
1,52を型開きし、左右分割金型53,54にて中空
樹脂製品1の1/2を保持する状態で中子6を抜取り、
或いは一方の分割金型5aにて中空樹脂製品1の1/4
を保持する状態で、且つ他方の分割金型5bが中空樹脂
製品1の凹凸部3に係止している型開きの初期に中子6
を抜取る。The molding die 5 can be formed into three or more divisions. Depending on the number of the molding dies 5, the holding range of the cross section orthogonal to the product length H of the hollow resin product 1 is, for example, 1 /.
3 or less, 1/4 or less. In the case of the molding die 5 configured into four parts, for example, as shown in FIG.
And the movable-side split mold 51 and the left and right split molds 53 and 54.
The mold 6 is opened together with the mold 1 and the core 6 is pulled out with the divided mold 52 holding 1/4 of the hollow resin product 1 or the mold 5 is divided.
The molds 1 and 52 are opened, and the core 6 is pulled out while holding half of the hollow resin product 1 by the left and right split molds 53 and 54.
Alternatively, in one of the split molds 5a, 1/4 of the hollow resin product 1 is used.
While the other split mold 5b is engaged with the concave-convex portion 3 of the hollow resin product 1 in the initial stage of the mold opening.
Remove.
【0015】[0015]
【発明の効果】本発明による樹脂の成形方法は上記のと
おりであるから、次に記載する効果を奏する。請求項1
の成形方法は、一方の分割金型で中空樹脂製品の1/2
以下を製品長さに渡り保持する状態で中子を完全に抜取
るものであるから、対抗力が弱い外壁の中空樹脂製品、
例えば外壁に貫通孔を設けた中空樹脂製品や網目状外壁
の中空樹脂製品でも、形崩れや損傷することなく取出す
ことができる。しかも中子に抜き勾配を必ずしも設ける
必要がないので、その分、金型設計が容易になるし、高
精度の中空樹脂製品を提供し得る。The resin molding method according to the present invention is as described above, and has the following effects. Claim 1
Molding method is to use one half of the split mold to
Since the core is completely removed while holding the following over the product length, the hollow resin product on the outer wall, which has a weak resistance,
For example, even a hollow resin product having a through-hole in the outer wall or a hollow resin product having a mesh-like outer wall can be taken out without collapse or damage. In addition, since it is not always necessary to provide a draft in the core, the design of the mold is made easier, and a highly accurate hollow resin product can be provided.
【0016】請求項2の成形方法は、一方の分割金型で
中空樹脂製品の1/2以下を製品長さに渡り保持する状
態で、しかも他方の分割金型が外壁の凹凸部に係止する
型開き初期に中子を完全に抜取るものであるから、一段
と軟弱な外壁の中空樹脂製品でも高精度に形成し得る。According to a second aspect of the present invention, there is provided a molding method in which one half of a hollow resin product is held over a product length by one of the split dies, and the other split die is engaged with an uneven portion of an outer wall. Since the core is completely removed in the early stage of the mold opening, even a hollow resin product having a softer outer wall can be formed with high precision.
【図1】(A)(B)(C)(D)(E)(F)本発明
による中空樹脂製品の第一成形方法を示す工程図であ
る。1 (A), 1 (B), 1 (C), 1 (D), 1 (E), 1 (F) are process diagrams showing a first molding method of a hollow resin product according to the present invention.
【図2】(A)(B)(C)第二成形方法の第一工程と
第二工程を示す工程図である。FIGS. 2A, 2B, and 2C are process diagrams showing a first step and a second step of a second molding method.
【図3】(A)(B)第二成形方法の第三工程と第四工
程を示す工程図である。FIGS. 3A and 3B are process diagrams showing a third step and a fourth step of the second molding method.
【図4】(A)(B)(C)(D)凹溝部と中空部の形
成例を示す一部切欠側面図と断面図である。FIGS. 4 (A), (B), (C), and (D) are a partially cutaway side view and a cross-sectional view showing an example of forming a concave groove portion and a hollow portion.
【図5】(A)(B)貫通孔の形成例を示す一部切欠側
面図と断面図である。FIGS. 5A and 5B are a partially cutaway side view and a cross-sectional view showing an example of forming a through hole.
【図6】(A)(B)突条部の部分形成例を示す一部切
欠側面図と断面図である。FIGS. 6A and 6B are a partially cutaway side view and a sectional view showing an example of partial formation of a ridge.
【図7】(A)(B)突条部の全長形成例を示す一部切
欠側面図と断面図である。FIGS. 7A and 7B are a partially cutaway side view and a cross-sectional view showing an example of forming a full length of a ridge.
【図8】(A)(B)凹溝部の全長形成例を示す一部切
欠側面図と断面図である。FIGS. 8A and 8B are a partially cutaway side view and a cross-sectional view showing an example of forming a full length of a concave groove portion.
【図9】(A)(B)(C)(D)凹溝部と突条部の複
合形成例を示す一部切欠側面図と断面図である。9 (A), (B), (C), and (D) are a partially cutaway side view and a cross-sectional view showing an example of composite formation of a concave groove and a ridge.
【図10】(A)(B)(C)(D)貫通孔と突条部の
複合形成例を示す一部切欠側面図と断面図である。FIGS. 10 (A), (B), (C), and (D) are a partially cutaway side view and a cross-sectional view showing an example of forming a composite of a through hole and a ridge.
【図11】(A)(B)(C)(D)凹溝部と貫通孔の
複合形成例を示す一部切欠側面図と断面図である。11 (A), (B), (C), and (D) are a partially cutaway side view and a cross-sectional view showing a composite formation example of a concave groove portion and a through hole.
【図12】(A)(B)(C)(D)(E)(F)凹凸
部の複合形成例を示す一部切欠側面図と断面図である。FIGS. 12 (A), (B), (C), (D), (E), and (F) are a partially cutaway side view and a cross-sectional view showing an example of composite formation of uneven portions.
【図13】(A)(B)(C)(D)(E)(F)外壁
の基本形成例を示す側面図である。13 (A), (B), (C), (D), (E), and (F) are side views showing examples of basic formation of an outer wall.
【図14】(A)(B)(C)(D)外壁の形状例を示
す側面図である。14A, 14B, 14C and 14D are side views showing examples of the shape of the outer wall.
【図15】(A)(B)中空部の形成例を示す基体の側
面図である。FIGS. 15A and 15B are side views of a base showing examples of forming a hollow portion.
【図16】二分割式金型における第一成形方法の型開き
例を示す断面図である。FIG. 16 is a cross-sectional view showing an example of mold opening of a first molding method in a two-piece mold.
【図17】(A)(B)四分割式金型における第一成形
方法の型開き例を示す断面図である。17 (A) and 17 (B) are cross-sectional views showing examples of mold opening in a first molding method in a four-piece mold.
【図18】(A)(B)二分割式金型における第二成形
方法の型開き例を示す断面図である。FIGS. 18A and 18B are cross-sectional views showing examples of mold opening in a second molding method in a two-piece mold.
【図19】(A)(B)四分割式金型における第二成形
方法の型開き例を示す断面図である。19 (A) and 19 (B) are cross-sectional views showing examples of mold opening in a second molding method in a four-piece mold.
【図20】(A)(B)(C)(D)従来中空樹脂製品
の成形方法を示す工程図である。20 (A), 20 (B), 20 (C), and 20 (D) are process diagrams showing a method for molding a conventional hollow resin product.
1 中空樹脂製品 2 基体、21 外壁、22 底部、23 仕切部 3 凹凸部、31 凹溝部、32 貫通孔、33 突条
部 4,41,42,43 中空部 5 成形金型、51,52,53,54 分割金型 5a 一方の分割金型、5b 他方の分割金型 6,R 中子 7 突出ピン A 固定金型 B 可動金型、B1,B2 スライドコア、b1 固定
板、b2 可動板 C キャビティ D 溶融樹脂 L 分割線、S 中空内部寸法 H 製品長さ、h 中空部長さ、t 外壁厚さDESCRIPTION OF SYMBOLS 1 Hollow resin product 2 Base, 21 outer wall, 22 bottom part, 23 partition part 3 Concavo-convex part, 31 concave groove part, 32 through-hole, 33 ridge part 4,41,42,43 hollow part 5 Molding die, 51,52, 53, 54 Split mold 5a One split mold, 5b The other split mold 6, R core 7 Protruding pin A Fixed mold B Movable mold, B1, B2 slide core, b1 fixed plate, b2 movable plate C Cavity D Molten resin L Parting line, S Hollow inner dimension H Product length, h Hollow part length, t Outer wall thickness
Claims (2)
1,52)と、分割金型(51,52)の分割線(L)
に沿って保持する中子(6)とで中空樹脂製品(1)の
キャビティ(C)を形成し、キャビティ(C)内で形成
した対抗力の弱い外壁(2)の中空樹脂製品(1)の取
出工程を、 一方の分割金型(5a)で中空樹脂製品(1)の製品長
さ(H)と直交する横断面の1/2以下を、製品長さ
(H)に渡り保持して型開きする第一工程と、 一方の分割金型(5a)に保持されている中空樹脂製品
(1)から中子(6)を完全に抜取る第二工程と、 一方の分割金型(5a)から中空樹脂製品(1)を型締
め方向に突き出す第三工程とから構成したことを特徴と
する中空樹脂製品の成形方法。1. A split mold (5) divided into at least two parts.
1, 52) and the dividing line (L) of the split molds (51, 52).
The cavity (C) of the hollow resin product (1) is formed with the core (6) held along the inner wall, and the hollow resin product (1) of the outer wall (2) formed in the cavity (C) and having a low opposing force. The half of the cross section orthogonal to the product length (H) of the hollow resin product (1) is held by the one split mold (5a) over the product length (H). A first step of opening the mold; a second step of completely removing the core (6) from the hollow resin product (1) held in the one split mold (5a); ), And a third step of projecting the hollow resin product (1) in the mold clamping direction from the step (a).
1,52)と、分割金型(51,52)の分割線(L)
に沿って保持する中子(6)とで中空樹脂製品(1)の
キャビティ(C)を形成し、キャビティ(C)内で形成
した対抗力の弱い外壁(2)の中空樹脂製品(1)の取
出工程を、 一方の分割金型(5a)で中空樹脂製品(1)の製品長
さ(H)と直交する横断面の1/2以下を、製品長さ
(H)に渡り保持して型開きする第一工程と、 他方の分割金型(5b)が外壁(2)の凹凸部(3)に
係止している型開き初期に中空樹脂製品(1)より中子
(6)を完全に抜取る第二工程と、 中子(6)の抜取り後に型開きを再開する第三工程と、 一方の分割金型(5a)から中空樹脂製品(1)を型締
め方向に突き出す第四工程から構成したことを特徴とす
る中空樹脂製品の成形方法。2. A split mold (5) divided into at least two parts.
1, 52) and the dividing line (L) of the split molds (51, 52).
The cavity (C) of the hollow resin product (1) is formed with the core (6) held along the inner wall, and the hollow resin product (1) of the outer wall (2) formed in the cavity (C) and having a low opposing force. The half of the cross section orthogonal to the product length (H) of the hollow resin product (1) is held by the one split mold (5a) over the product length (H). The first step of opening the mold, and the core (6) is removed from the hollow resin product (1) at the beginning of the mold opening when the other split mold (5b) is engaged with the uneven portion (3) of the outer wall (2). A second step of completely removing the mold, a third step of restarting the mold opening after the removal of the core (6), and a fourth step of projecting the hollow resin product (1) from one of the split molds (5a) in the mold clamping direction. A method for molding a hollow resin product, comprising:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6063696A JP2960347B2 (en) | 1996-03-18 | 1996-03-18 | Molding method for hollow resin products |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6063696A JP2960347B2 (en) | 1996-03-18 | 1996-03-18 | Molding method for hollow resin products |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09248830A JPH09248830A (en) | 1997-09-22 |
JP2960347B2 true JP2960347B2 (en) | 1999-10-06 |
Family
ID=13148011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6063696A Expired - Lifetime JP2960347B2 (en) | 1996-03-18 | 1996-03-18 | Molding method for hollow resin products |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2960347B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5365333B2 (en) * | 2009-04-30 | 2013-12-11 | ぺんてる株式会社 | Cavity block for forming a cylindrical member having an outer diameter of a polygon and an inner diameter, and a core pin |
JP2016188059A (en) * | 2015-03-30 | 2016-11-04 | アスモ株式会社 | Cleaning device |
CN112356406B (en) * | 2020-09-21 | 2022-05-27 | 贝隆精密科技股份有限公司 | Outward appearance piece demoulding structure |
-
1996
- 1996-03-18 JP JP6063696A patent/JP2960347B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH09248830A (en) | 1997-09-22 |
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