JPH0557760A - Injection mold having undercut part - Google Patents
Injection mold having undercut partInfo
- Publication number
- JPH0557760A JPH0557760A JP22264291A JP22264291A JPH0557760A JP H0557760 A JPH0557760 A JP H0557760A JP 22264291 A JP22264291 A JP 22264291A JP 22264291 A JP22264291 A JP 22264291A JP H0557760 A JPH0557760 A JP H0557760A
- Authority
- JP
- Japan
- Prior art keywords
- core
- open
- slide
- undercut portion
- injection
- 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
Links
- 238000002347 injection Methods 0.000 title description 5
- 239000007924 injection Substances 0.000 title description 5
- 230000013011 mating Effects 0.000 claims abstract description 16
- 238000001746 injection moulding Methods 0.000 claims description 28
- 238000000465 moulding Methods 0.000 claims description 20
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4421—Removing or ejecting moulded articles for undercut articles using expansible or collapsible cores
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はアンダーカット部を有す
る射出成形金型に係り、例えばアンダーカット部におい
て内周ネジ部を有した成形品を射出成形するために好適
に適用されるアンダーカット部を有する射出成形金型に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding die having an undercut portion, and for example, an undercut portion suitably applied for injection molding a molded product having an inner peripheral thread portion in the undercut portion. And an injection mold having
【０００２】[0002]
【従来の技術】従来より、アンダーカット部を有した成
形品を射出成形するために、開きコアまたはスライドコ
アを有する射出成形金型を使用する技術が知られてい
る。特公昭５９−１４３３３号公報は係る射出成形金型
の一例であり、本提案によれば、中心コアの外周面にお
いて蟻溝により係合している２群６個のスライド駒を設
けて構成されており、金型の型開時に中心コアを同様に
型開き方向に移動することで、蟻溝係合している各スラ
イド駒を直径方向内側に移動させることで成形後の成形
品を取り出し可能にするものである。2. Description of the Related Art Conventionally, there has been known a technique of using an injection molding die having an open core or a slide core for injection molding a molded product having an undercut portion. Japanese Examined Patent Publication No. 59-14333 is an example of such an injection molding die, and according to the present proposal, it is configured by providing two groups of six slide pieces engaged by dovetail grooves on the outer peripheral surface of the central core. By moving the central core in the mold opening direction when the mold is opened, each slide piece engaged in the dovetail groove can be moved inward in the diametrical direction to take out the molded product after molding. It is something to do.
【０００３】また、特開昭５９−１５０７１５号公報に
よれば、上記の射出成形金型に設けられる一対の蟻溝係
合部を特殊形状に構成して、スライド駒同志の干渉防止
を図る提案がなされている。一方、特開昭６１−７４８
１７号公報の「アンダーカット成形方法」によれば可動
側型板に設けられたアンギュラピンにより大小のスライ
ド駒を移動する構成の提案がなされている。Further, according to Japanese Patent Application Laid-Open No. 59-150715, it is proposed that a pair of dovetail groove engaging portions provided in the injection molding die have a special shape to prevent interference between the slide pieces. Has been done. On the other hand, JP-A-61-748
According to the "Undercut molding method" of Japanese Patent No. 17, there is proposed a structure in which large and small slide pieces are moved by an angular pin provided on a movable side mold plate.
【０００４】図に基づいて該提案を概略説明すると、図
８は特開昭６１−７４８１７号公報に掲載された動作説
明図面である。本図は成形品Ｈを形成後に型開きして、
スライド駒をアンダーカット部の内径側に移動する様子
を示しいてる。本図において、センターピン３１はエジ
エクタープレートに下端が固定されるとともに外周面に
テーパ面を形成したテーパピン３２の中心に穿設された
貫通穴を貫通して設けられている。また可動型板１９に
下端が固定されるテーパピン３２の円周方向にはアンギ
ュラピン１８が放射状に固定されており、作用端が大小
スライド駒５０、９０に設けられた穴部５０ａ、９０ａ
に潜入しているが、より大きな円弧状のアンダーカット
部を形成した大スライド駒５０の穴部５０ａは長穴状に
形成される一方、小さな円弧状のアンダーカット部を形
成した小スライド駒９０の穴部９０ａは略円形に形成さ
れている。FIG. 8 is a diagram for explaining the operation disclosed in Japanese Patent Laid-Open No. 61-74817. This figure shows that after forming a molded product H, the mold is opened and
It is shown that the slide piece is moved to the inner diameter side of the undercut portion. In the figure, the center pin 31 is provided through the through hole formed at the center of the taper pin 32 whose lower end is fixed to the ejector plate and whose outer peripheral surface is tapered. Further, the angular pins 18 are radially fixed in the circumferential direction of the taper pin 32 whose lower end is fixed to the movable mold plate 19, and the working ends are holes 50a and 90a provided in the large and small slide pieces 50 and 90.
The large slide piece 50 having a larger arc-shaped undercut portion has a hole 50a formed in an elongated hole shape, while the small slide piece 90 formed with a small arc-shaped undercut portion. The hole 90a is formed in a substantially circular shape.
【０００５】以上説明の特開昭６１−７４８１７号公報
の「アンダーカット成形方法」において、型閉め状態で
は、テーパピン３２のテーパ面に対して放射状に配設さ
れた各スライド駒５０、９０が密着することにより、外
直径方向に開いて成形品Ｈ成形のためのアンダーカット
部を形成してアンダーカット部を形成する。その後、上
図に示すように、先ず小さな円弧状のアンダーカット部
を形成した小スライド駒９０を穴部９０ａとアンギュラ
ピン１８とによる相互移動作用で内直径方向に移動し
て、大スライド駒５０を移動させる空間を確保してから
大スライド駒５０の穴部５０ａとアンギュラピン１８と
による相互移動作用で内直径方向に移動するものであ
る。In the "undercut molding method" of Japanese Patent Laid-Open No. 61-74817 described above, when the mold is closed, the slide pieces 50 and 90 radially arranged are closely attached to the taper surface of the taper pin 32. By doing so, an undercut portion for forming the molded product H is formed by opening in the outer diameter direction to form the undercut portion. Thereafter, as shown in the above figure, first, the small slide piece 90 having a small arc-shaped undercut portion is moved in the inner diameter direction by the mutual movement action of the hole 90a and the angular pin 18, and the large slide piece 50 is moved. After securing the space for moving, the hole 50a of the large slide piece 50 and the angular pin 18 move in the inner diameter direction by the mutual movement action.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上述の
特公昭５９−１４３３３号になる提案によれば、中心コ
アに蟻溝係合されている一対のスライド駒の一面を他の
スライド駒のスライド面として使用している結果、スラ
イド駒の分割面は常に摺動面となり、スライド駒の摩耗
が発生する。また、中心コアとスライド駒の位置決めを
蟻溝係合部で行っていることから、この蟻溝係合部が摩
耗すると中心コアとスライド駒間の正確な位置決めがで
きなくなる問題点がある。However, according to the proposal of Japanese Patent Publication No. 59-14333, one surface of a pair of slide pieces engaged with a central core in a dovetail groove is used as a slide surface of another slide piece. As a result, the divided surface of the slide piece is always a sliding surface, and wear of the slide piece occurs. Further, since the central core and the slide piece are positioned by the dovetail groove engaging portion, there is a problem that if the dovetail groove engaging portion wears, the central core and the slide piece cannot be accurately positioned.
【０００７】一方、特開昭５９−１５０７１５号公報の
提案においては、型開き時においてスライド駒が直径方
向に移動する際に、特殊蟻溝係合部の摩耗が激しく起こ
るので、結局は中心コアとスライド駒間の正確な位置決
めができなくなる問題点がある。また、特開昭６１−７
４８１７号公報はテーパピンに対してセンターピンを貫
通状態で設けるとともに放射状に多数のスライド駒を配
設しており、金型が複雑になる問題点がある。また、各
スライド駒を内径側に移動するために、各スライド駒の
穴部とアンギュラピンとによる相互移動作用に依存した
構成であるので、各スライド駒を内径側に移動する案内
部が必要となるので、さらに金型が複雑になる問題点が
ある。On the other hand, in the proposal of Japanese Patent Laid-Open No. 59-150715, when the slide piece moves in the diametrical direction when the mold is opened, the special dovetail groove engaging portion is abraded, so that the central core is eventually brought about. There is a problem that accurate positioning between the slide piece and the slide piece cannot be performed. In addition, JP-A-61-7
In Japanese Patent No. 4817, a center pin is provided in a penetrating state with respect to a taper pin and a large number of slide pieces are radially arranged, which causes a problem that a die is complicated. Further, since the structure depends on the mutual movement action of the hole of each slide piece and the angular pin in order to move each slide piece to the inner diameter side, a guide portion for moving each slide piece to the inner diameter side is required. However, there is a problem that the mold becomes more complicated.
【０００８】また、スライド駒の合わせ目において形成
された成形品の部位にバリが発生する問題がある。した
がつて、本発明は上述の事情に鑑みてなされたものであ
り、その目的は、中心コアとスライド駒間の正確な位置
決めができるので精度の確保でき、蟻溝係合部の摩耗防
止ができて、かつ比較的簡単に構成可能なアンダーカッ
ト部を有する射出成形金型を提供することにある。Further, there is a problem that burrs are generated at the portion of the molded product formed at the joint of the slide pieces. Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to ensure accurate positioning between the central core and the slide piece, thereby ensuring accuracy and preventing wear of the dovetail groove engaging portion. An object of the present invention is to provide an injection molding die having an undercut portion that can be formed and that can be configured relatively easily.
【０００９】[0009]
【課題を解決するための手段】及び[Means for Solving the Problems] and
【作用】上述の課題を解決し、目的を達成するために本
発明のアンダーカット部を有する射出成形金型は、次第
に先細りに形成された中心コアと、該中心コアの長手方
向の中心線に沿う移動にともない外寸法を変化するアン
ダーカット部を有してなり該中心コアの周囲を取り囲む
ようにしてキャビティ内に配設される複数の開きコアを
有する射出成形装置であって、前記開きコア間の合わせ
面を前記中心線に平行な平面で形成するとともに、前記
中心コアの前記移動に対して前記開きコアを追動するよ
うに構成することで、型閉め時のキャビティの高精度を
確保し、かつ耐久性を向上するように働く。In order to solve the above-mentioned problems and to achieve the object, an injection molding die having an undercut portion of the present invention has a central core gradually tapered and a center line in the longitudinal direction of the central core. An injection molding apparatus having a plurality of open cores, each of which has an undercut portion whose outer dimension changes along with the movement thereof, and which is arranged in a cavity so as to surround the periphery of the central core. High accuracy of the cavity at the time of mold closing is ensured by forming the mating surface with a plane parallel to the center line and by arranging the open core to follow the movement of the center core. And works to improve durability.
【００１０】また、好ましくは、前記アンダーカット部
を内周ネジ状に形成するために、対向する側面を小傾斜
角度と大傾斜角度とで形成した略四角錐台形状に形成し
た前記中心コアと、前記小傾斜角度の側面に沿って摺動
移動するスライド面と大円弧状ネジ部と前記合わせ面と
を形成した１対の第１開コアと、前記大傾斜角度の側面
に沿って摺動移動するスライド面と小円弧状ネジ部と前
記合わせ面とを形成した１対の第２開コアとを具備して
なり、前記移動により前記第２開コア側を前記第１開コ
アよりも早く移動するように構成して、型閉め時のアン
ダーカット部を内周ネジ状にしたキャビティの高精度を
確保し、かつ耐久性を向上するように働く。Further, preferably, in order to form the undercut portion in an inner peripheral thread shape, the central core is formed in a substantially quadrangular truncated pyramid shape in which opposing side surfaces are formed with a small inclination angle and a large inclination angle. A pair of first open cores forming a sliding surface, a large arcuate screw portion, and the mating surface that slide along the side surface of the small inclination angle, and slide along the side surface of the large inclination angle It comprises a pair of second open cores having a moving slide surface, a small arcuate screw portion and the mating surface, and the second open core side is moved earlier than the first open core by the movement. It is configured to move, and it works to secure the high accuracy of the cavity in which the undercut portion has an inner peripheral screw shape when the mold is closed and to improve the durability.
【００１１】また、好ましくは、前記小傾斜角度の側面
に沿って摺動移動するスライド面と、前記大傾斜角度の
側面に沿って摺動移動するスライド面とを蟻溝係合して
前記追動をするように構成して、キャビティの高精度を
確保し、かつ耐久性を向上するように働く。また、好ま
しくは、前記合わせ目に前記中心コア側に向かう成形凹
部を形成して、成形後のバリ発生が螺合に及ばないよう
にする。すなわち、前記合わせ目におけるネジ形状は、
第１開きコア及び第２開きコアに形成されたネジ形状よ
り浅く形成し、成形後のバリ発生が螺合に影響しないよ
うにする。Further, preferably, the slide surface slidingly moving along the side surface of the small inclination angle and the slide surface slidingly moving along the side surface of the large inclination angle are engaged with the dovetail groove to add the additional surface. It is configured to move so as to ensure high accuracy of the cavity and improve durability. Further, it is preferable that a molding recess is formed at the seam toward the central core so that burr after molding does not occur in screwing. That is, the screw shape at the joint is
The first open core and the second open core are formed so as to be shallower than the screw shapes formed so that burr formation after molding does not affect screwing.
【００１２】また、好ましくは、前記中心コアの前記側
面に沿って形成される案内部に対して前記摺動移動する
前記開きコアと、該開きコアに一体的に形成される穴部
を有するフランジ部と、前記穴部に対して挿通されるア
ンギュラピンを可動型に設けて、蟻溝を不要にして、ア
ンダーカット部を有する射出成形金型を簡単に構成でき
るようにする。また、好ましくは、開きコアを４個以上
設けるために、前記中心コアを多角形角錐で形成して、
さらに複雑なアンダーカット部を有するキャビティを形
成可能にする。Further, preferably, a flange having the open core that slides and moves with respect to a guide portion formed along the side surface of the central core, and a hole formed integrally with the open core. And the angular pin that is inserted into the hole are provided in the movable mold, and the dovetail groove is not required, so that the injection mold having the undercut portion can be easily configured. Further, preferably, in order to provide four or more open cores, the central core is formed of a polygonal pyramid,
Further, it is possible to form a cavity having a complicated undercut portion.
【００１３】[0013]
【実施例】以下に本発明の好適な実施例について、図面
を参照の上で詳細に説明する。図１はアンダーカット部
を有する射出成形金型の第１実施例に係る立体分解斜視
図であり、要部構成のみ図示したものであって、図中の
二点鎖線で図示される成形位置にスライド駒５、９のア
ンダーカット部が位置する状態で組みつけられるもので
あるが、説明のためにスライド駒５、９を中心コア１か
ら離して表している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a three-dimensional exploded perspective view of an injection-molding die having an undercut portion according to a first embodiment, showing only a main part configuration and at a molding position shown by a two-dot chain line in the figure. Although the slide pieces 5 and 9 are assembled in a state where the undercut portions of the slide pieces 5 and 9 are located, the slide pieces 5 and 9 are shown separated from the central core 1 for the sake of explanation.
【００１４】さて、本図において、中心コア１は図示の
ように、可動型に対する取付け部１ｂから上面１ａに向
かって次第に側面が小さくなる四角錐台形状に形成され
る一方、互いに対向して形成されるとともに、中心コア
１の長手方向の中心軸線に垂直な平面Ｑと成す傾斜角度
がθ１の第１傾斜面２と、同じく互いに対向して形成さ
れるとともに、中心コア１の長手方向の中心軸線に垂直
な平面Ｑと成す傾斜角度がθ２の第２傾斜面３を有して
いる。In the figure, as shown in the figure, the central core 1 is formed in a truncated pyramid shape whose side surface gradually decreases from the mounting portion 1b to the movable die toward the upper surface 1a, while facing each other. And the first inclined surface 2 having an inclination angle θ1 formed by the plane Q perpendicular to the central axis of the central core 1 in the longitudinal direction, and the first inclined surface 2 are also formed to face each other, and the center of the central core 1 in the longitudinal direction is formed. It has a second inclined surface 3 having an inclination angle of θ2 with the plane Q perpendicular to the axis.
【００１５】これらの傾斜角度θ１を例えば４度、θ１
を８度にすることで、後述する各スライド駒の移動量に
差を付けれるようにしている。さらに、第１傾斜面２は
互いに平行なスライド案内面２ａを側面に設けており、
大スライド駒５のスライド側面８ａに対して摺動案内で
きるするように構成されている。また、上述の第１、第
２傾斜面２、３の略中心には、大スライド駒５と小スラ
イド駒９に夫々形成された凸溝部７に嵌り込むことで、
組みつけ後に摺動自在にできるが、角傾斜面２、３から
離れるようにはできない蟻溝４が夫々上下端部を開口し
て図示のように加工されている。These inclination angles θ1 are, for example, 4 degrees, θ1
By setting the angle to 8 degrees, it is possible to make a difference in the movement amount of each slide piece described later. Further, the first inclined surface 2 has slide guide surfaces 2a parallel to each other on its side surface,
The large slide piece 5 is configured to be slidably guided on the slide side surface 8a. Further, by fitting into the convex groove portions 7 formed on the large slide piece 5 and the small slide piece 9, respectively, at substantially the centers of the first and second inclined surfaces 2 and 3 described above,
Dovetail grooves 4 which can be slid after assembly but cannot be separated from the angled inclined surfaces 2 and 3 are machined as shown by opening upper and lower ends respectively.
【００１６】そして、第２傾斜面３は図示のように、上
面部１ａから取付部１ｂに次第にその側面が狭くなると
ともに、スライド案内面２ａに対して交差する平面で形
成されている。次に、図示のように一対が対向して組み
つけられる大スライド駒５は、上述の傾斜角度θ１の第
１傾斜面２に沿って摺動移動するスライド面８と、スラ
イド面８の中央の凸溝部７と、上述のアンダーカット部
の一部を形成する大円弧状ネジ部５ａと、中心コア１の
長手方向の中心軸線に平行な平面で形成される合わせ面
６を左右対称に形成している。As shown in the figure, the second inclined surface 3 has a side surface gradually narrowing from the upper surface portion 1a to the mounting portion 1b, and is formed by a plane intersecting with the slide guide surface 2a. Next, as shown in the figure, the large slide pieces 5 assembled in a pair so as to face each other include a slide surface 8 that slides along the first inclined surface 2 having the above-described inclination angle θ1, and a center of the slide surface 8. The convex groove portion 7, the large arcuate screw portion 5a forming a part of the above-mentioned undercut portion, and the mating surface 6 formed by a plane parallel to the central axis of the central core 1 in the longitudinal direction are formed symmetrically. ing.
【００１７】また、、図示のように一対が対向して組み
つけられる小スライド駒９の構成は、上述の傾斜角度θ
２の第２傾斜面３に沿って摺動移動するスライド面１１
と、スライド面１１の中央の凸溝部７と、上述のアンダ
ーカット部の一部を形成する小円弧状ネジ部９ａと、中
心コア１の長手方向の中心軸線に平行な平面で形成され
る合わせ面１０を左右対称に形成する一方、逃げ面１２
を形成している。Further, as shown in the figure, the construction of the small slide pieces 9 assembled in a pair so as to face each other is as follows.
Slide surface 11 slidingly moving along the second inclined surface 3
A central convex groove portion 7 of the slide surface 11, a small arcuate screw portion 9a forming a part of the undercut portion, and a flat surface parallel to the central axis of the central core 1 in the longitudinal direction. The surface 10 is formed symmetrically while the flank 12
Is formed.
【００１８】以上説明の中心コア１の蟻溝４に凸溝部７
を開口部から挿入して組み立てることで、二点鎖線図示
の成形位置２０に一対の小円弧状ネジ部９ａと、一対の
大円弧状ネジ部５ａとが位置するようにして、アンダー
カット部の成形を行う。この二点鎖線図示の成形位置２
０になるようにするためには、大スライド駒５のスライ
ド面８は第１傾斜面２に対して摺動されつつ移動を行う
一方、小スライド駒９のスライド面１１は第２傾斜面３
に対して摺動されつつ移動するが、これに前後して、互
いの合わせ面６、１０が近ずくように平行移動されて行
き最後に密着して二点鎖線図示の成形位置２０になる。The convex groove portion 7 is formed in the dovetail groove 4 of the central core 1 described above.
Is inserted from the opening and assembled, so that the pair of small arc-shaped screw parts 9a and the pair of large arc-shaped screw parts 5a are located at the molding position 20 shown by the chain double-dashed line. Perform molding. Forming position 2 shown by the two-dot chain line
In order to make it zero, the slide surface 8 of the large slide piece 5 moves while being slid with respect to the first inclined surface 2, while the slide surface 11 of the small slide piece 9 moves to the second inclined surface 3.
It moves while sliding with respect to, but before and after this, the mating surfaces 6, 10 are moved in parallel so that they come close to each other, and finally they come into close contact with each other to reach the molding position 20 shown by the chain double-dashed line.
【００１９】以上の成形後に、型開きをする様子を図２
の動作説明図に基づいて説明する。成形後に型開きが行
われると、中心コア１は図中の矢印Ａ方向に移動される
が、大スライド駒５と小スライド駒９は不図示の型板に
より矢印Ａ方向には移動できないように規制されている
ために、成形位置２０の直径内側方向に移動を開始す
る。つまり、第１傾斜面２の蟻溝４に係合している大ス
ライド駒５には矢印Ａ方向に移動する分力が作用して、
図中の矢印Ｃ方向の中心に向かう。また、中心コアがＡ
方向に移動し、作動時には中心コア上面はスライド駒の
上面５ｂおよび上面９ｂの面位置より低い位置となる。FIG. 2 shows how the mold is opened after the above molding.
The operation will be described with reference to the operation explanatory diagram. When the mold is opened after molding, the central core 1 is moved in the direction of arrow A in the figure, but the large slide piece 5 and the small slide piece 9 are prevented from moving in the direction of arrow A by a mold plate (not shown). Since it is restricted, it starts to move inward in the diameter of the molding position 20. That is, a component force of moving in the direction of arrow A acts on the large slide piece 5 engaged with the dovetail groove 4 of the first inclined surface 2,
Heading to the center in the direction of arrow C in the figure. The central core is A
The central core upper surface is lower than the surface positions of the upper surface 5b and the upper surface 9b of the slide piece during operation.
【００２０】また、第２傾斜面３の蟻溝４に係合してい
る小スライド駒９にも矢印Ａ方向に移動する分力が同様
に作用して、図中の矢印Ｂ方向の中心に向かうことにな
るが、上述のように第１傾斜面２の傾斜角度θ１を４度
にする一方、第２傾斜面の傾斜角度θ２を倍の８度にし
ていることから、小スライド駒９の矢印Ｂ方向の移動量
は大スライド駒５の矢印Ｃ方向の移動量の２倍あるの
で、小スライド駒９のほうが大スライド駒５よりもの先
に中心側に移動することから、直径を縮小する方向に移
動できる。また、型開き時のスライド駒５、９同士の干
渉は防止される。Further, the component force moving in the direction of arrow A also acts on the small slide piece 9 engaged with the dovetail groove 4 of the second inclined surface 3 to move it to the center in the direction of arrow B in the figure. As described above, the inclination angle θ1 of the first inclined surface 2 is set to 4 degrees, while the inclination angle θ2 of the second inclined surface is doubled to 8 degrees, as described above. Since the amount of movement in the direction of arrow B is twice the amount of movement of the large slide piece 5 in the direction of arrow C, the small slide piece 9 moves to the center side earlier than the large slide piece 5, thus reducing the diameter. You can move in any direction. Further, the interference between the slide pieces 5 and 9 when the mold is opened is prevented.
【００２１】一方、再度成形準備のために型閉めして矢
印Ａと逆方向に中心コア１の移動が行われると、スライ
ド駒５、９は矢印Ｂ、Ｃと逆方向に移動しつつ上方に移
動して図中の二点鎖線で図示の位置に移動されるが、ス
ライド駒５、９の互いの合わせ目６、１０は上述のよう
に平行移動されて密着される構成であるので、合わせ目
６、１０の摩耗は発生しないことになる。さらに、大ス
ライド駒５はスライド面８の側面８ａでも摺動案内され
るので、上述の矢印方向Ｃの移動が円滑にできることに
なる。On the other hand, when the central core 1 is moved in the direction opposite to the arrow A and the slide cores 5 and 9 are moved in the direction opposite to the arrows B and C, the mold is closed again for the preparation for molding and the slide cores 5 and 9 are moved upward. Although it is moved and moved to the position shown by the two-dot chain line in the figure, the joints 6 and 10 of the slide pieces 5 and 9 are moved in parallel as described above to be in close contact with each other. No wear on the eyes 6, 10 will occur. Further, since the large slide piece 5 is also slidably guided by the side surface 8a of the slide surface 8, the movement in the arrow direction C can be smoothly performed.
【００２２】次に、図３は第２実施例に係る射出成形金
型の正面図であって、図１中に図示の二点鎖線で図示さ
れる成形位置２０にスライド駒５、９のアンダーカット
部が位置している様子を表している。本図において、基
本構成は図１、２により説明済なので詳細は同様の符号
を付して説明を割愛して相違部分に限定して述べると、
中心コア１の上面部１ａと、スライド駒５、９の各上面
部５ｂ、９ｂとが同一面になるとともに、合わせ目６、
１０が密着するように移動されている。この状態で、一
対の小円弧状ネジ部９ａと大円弧状ネジ部５ａにより外
形寸法Ｄのアンダーカット部を形成するとともに、幅寸
法ｗ、高さ寸法ｈの凸状合わせ部１４を夫々の合わせ目
６、１０において形成している。Next, FIG. 3 is a front view of the injection molding die according to the second embodiment, in which the slide pieces 5 and 9 are placed under the molding position 20 shown by the chain double-dashed line in FIG. It shows how the cut part is located. In this figure, since the basic configuration has been described with reference to FIGS. 1 and 2, the details are given the same reference numerals, and the description will be omitted and only the different parts will be described.
The upper surface portion 1a of the central core 1 and the upper surface portions 5b, 9b of the slide pieces 5, 9 are flush with each other, and the seam 6,
10 has been moved to be in close contact. In this state, the undercut portion having the outer dimension D is formed by the pair of small arc-shaped screw portions 9a and the large arc-shaped screw portion 5a, and the convex mating portions 14 having the width dimension w and the height dimension h are fitted together. Formed in eyes 6 and 10.
【００２３】以上の構成により、長期間の金型使用後な
どにおいて、合わせ目６、１０に隙間が発生した場合
に、この隙間に入り込んで発生するバリが成形品側に発
生することになるが、上述の凸状合わせ部１４により、
成形品のネジ部の内径側にバリが形成されることになる
ので、バリの影響がネジ部の機能に影響しないことにな
る。そこで、上述の高さ寸法ｈを０．１ミリに設定すれ
ば、バリ高さが０．１ミリ以下であればバリの影響がネ
ジ部の機能に影響しないことになる。ちなみに、高さ寸
法ｈを０．１ミリに設定した場合において、Ｄ寸法を５
７ミリ、ｗ寸法を４ミリにすることで好結果を得ること
ができた。With the above construction, when a gap is formed in the joints 6 and 10 after the mold has been used for a long period of time, a burr generated by entering the gap is generated on the molded product side. By the above-mentioned convex mating portion 14,
Since a burr is formed on the inner diameter side of the screw part of the molded product, the effect of the burr does not affect the function of the screw part. Therefore, if the above-mentioned height dimension h is set to 0.1 mm, the effect of the burr does not affect the function of the screw portion if the burr height is 0.1 mm or less. By the way, when the height dimension h is set to 0.1 mm, the D dimension is 5
Good results could be obtained by setting the width to 7 mm and the w dimension to 4 mm.
【００２４】続いて、図４は第３実施例に係る射出成形
金型の正面図、図５は射出成形金型の要部断面図であっ
て、型閉め状態を図示している。先ず図４は、図１中に
おいて二点鎖線で図示される成形位置２０にスライド駒
５、９のアンダーカット部が位置している様子を表して
いる。本図において、基本構成は図１、２により説明済
なので詳細は同様の符号を付して説明を割愛して相違部
分に限定して述べると、中心コア１の上面部と、スライ
ド駒５、９の各上面部とが同一面になるとともに、合わ
せ目６、１０が密着するように移動されている。この状
態で、一対の小円弧状ネジ部と大円弧状ネジ部によりア
ンダーカット部を形成している。Next, FIG. 4 is a front view of the injection molding die according to the third embodiment, and FIG. 5 is a sectional view of the main part of the injection molding die, showing the mold closed state. First, FIG. 4 shows a state in which the undercut portions of the slide pieces 5 and 9 are located at the molding position 20 shown by the chain double-dashed line in FIG. In this figure, the basic structure has already been described with reference to FIGS. 1 and 2, and the details will be given the same reference numerals and the description will be omitted and the description will be limited to different parts. The upper surface of the central core 1 and the slide piece 5, Each upper surface of 9 is flush with each other, and the joints 6 and 10 are moved so as to be in close contact with each other. In this state, the undercut portion is formed by the pair of small arc-shaped screw parts and large arc-shaped screw parts.
【００２５】また、中心コア１の夫々の傾斜面に加工形
成される蟻溝４は図示のように垂直な側面を両側に形成
しており、この蟻溝４に対して直接挿入される凸蟻溝部
７を夫々設けたスライド駒５、９を図示のように４側面
において移動できるように設けている。これらのスライ
ド駒５、９には中心コア１から放射状に延びるフランジ
部５ｆ、９ｆが一体形成されており、これらのフランジ
部５ｆ、９ｆに穿設されている穴部５ｇ、９ｇに対して
後述のアンギュラピン１８が夫々挿通状態にされる。Further, the dovetail grooves 4 formed on the respective inclined surfaces of the central core 1 have vertical side surfaces on both sides as shown in the drawing, and convex dovetails directly inserted into the dovetail grooves 4 are formed. Slide pieces 5 and 9 each provided with a groove portion 7 are provided so as to be movable on four side surfaces as shown in the drawing. Flange portions 5f and 9f extending radially from the central core 1 are integrally formed on the slide pieces 5 and 9, and holes 5g and 9g formed in the flange portions 5f and 9f will be described later. The angular pins 18 are put into the respective inserted states.
【００２６】次に、図５において固定側型１６には樹脂
注入のためのランナとゲート及び穴部１６ａが形成され
ており、図示の型閉め状態において、上述のアンダーカ
ット部により形成されるキャビティ中に溶融樹脂の注入
を可能にする一方、中心コア１のネジ部に螺合されてい
ボルト１５を穴部１６ａに案内挿入することで、固定側
型１６と中心コア１の相互位置関係を決定できるように
している。Next, in FIG. 5, a fixed side mold 16 is formed with a runner for injection of resin, a gate and a hole 16a, and in the mold closed state shown in the figure, a cavity formed by the above-mentioned undercut portion. While allowing molten resin to be injected therein, the mutual positional relationship between the fixed side mold 16 and the central core 1 is determined by inserting the bolt 15 that is screwed into the threaded portion of the central core 1 into the hole 16a. I am able to do it.
【００２７】この固定側型１６には第１分離面Ｐ１を分
離面にする可動側型板１７と、この可動側型板１７に対
して第２分離面Ｐ２を分離面にする受け板１９が図示の
型閉め状態と型開き状態になるように移動自在に夫々設
けられて周知の金型構造を構成している。また、アンギ
ュラピン１８を挿通状態にするための長穴２１ｂを穿設
した摺動案内板２１はボルト１５を用いてスペーサ２２
を介して可動側型板１７に固定されており、摺動案内板
２１の摺動面２１ａと可動側型板１７の摺動面１７ａに
挟まれる空間部位を形成しており、上述のスライド駒
５、９のフランジ部５ｆ，９ｆをこの空間部位内におい
て摺動可能にしている。The fixed mold 16 is provided with a movable mold plate 17 having the first separation surface P1 as a separation surface and a receiving plate 19 having the second separation surface P2 as a separation surface with respect to the movable side mold plate 17. The molds are provided so as to be movable so as to be in a mold closed state and a mold opened state, respectively, to form a known mold structure. Further, the sliding guide plate 21 having the elongated hole 21b for allowing the angular pin 18 to be inserted is provided with the spacer 22 by using the bolt 15.
Is fixed to the movable-side mold plate 17 via a sliding surface 21a of the sliding guide plate 21 and the sliding surface 17a of the movable-side mold plate 17 to form a space portion. The flange portions 5f and 9f of 5 and 9 are slidable within this space portion.
【００２８】一方、可動側型板１７には雌部１７ａが形
成されており、上述のスライド駒のアンダーカット部で
ある一対の小円弧状ネジ部９ａと大円弧状ネジ部５ａに
よりキャビティを形成している。また、受け板１９に対
してボルト１５により固定されて、図中の矢印Ａ方向に
移動される中心コア１は上述のように、可動型に対する
取付け部１ｂから上面１ａに向かって次第に側面が小さ
くなる四角錐台形状に形成される一方、互いに対向して
形成されるとともに、中心コア１の長手方向の中心軸線
に垂直な平面Ｑと成す傾斜角度がθ１の第１傾斜面２
と、同じく互いに対向して形成されるとともに、中心コ
ア１の長手方向の中心軸線に垂直な平面Ｑと成す傾斜角
度がθ２の第２傾斜面３を有している。On the other hand, a female part 17a is formed on the movable side mold plate 17, and a cavity is formed by a pair of small arc-shaped screw parts 9a and large arc-shaped screw parts 5a which are the undercut parts of the slide piece. ing. Further, as described above, the central core 1 fixed to the receiving plate 19 by the bolts 15 and moved in the direction of arrow A in the figure has the side surface gradually becoming smaller from the mounting portion 1b for the movable die toward the upper surface 1a. The first inclined surface 2 is formed in the shape of a quadrangular pyramid, and is formed to face each other, and the inclination angle formed by the plane Q perpendicular to the central axis of the central core 1 in the longitudinal direction is θ1.
And a second inclined surface 3 which is also formed to face each other and which has an inclination angle of θ2 with the plane Q perpendicular to the central axis of the central core 1 in the longitudinal direction.
【００２９】これらの傾斜角度θ１を例えば４度、θ１
を８度にすることで、大小各スライド駒５、９の移動量
に差を付けるようにしている。また、受け板１５に対し
て、ボルト１５を用いて固定されるアンギュラピン１８
は、型閉め時において、その先端が可動側型板１７のニ
ゲ穴部１７ｃに潜入するとともに、各スライド駒５、９
のフランジ部５ｆ，９ｆに夫々傾斜角度θ１、θ２を傾
けて穿設された穴部５ｇ、９ｇに対して潜入して、かつ
穴部５ｇ、９ｇ中を摺動自在になるように夫々が受け板
１９に傾けて固定されている。These inclination angles θ1 are, for example, 4 degrees, θ1
By setting 8 degrees, the amount of movement of the large and small slide pieces 5 and 9 is made different. Further, the angular pin 18 fixed to the receiving plate 15 with the bolt 15 is used.
When the mold is closed, the tip thereof sneaks into the negative hole portion 17c of the movable mold plate 17, and the slide pieces 5, 9
Of the flanges 5f and 9f of the respective holes 5g and 9g, which are slanted at inclination angles θ1 and θ2, respectively, and are slidably received in the holes 5g and 9g. It is tilted and fixed to the plate 19.
【００３０】以上の構成において、キャビティ内への樹
脂注入後に硬化を待ち、分離面Ｐ１、とＰ２における型
開きが行われると、中心コア１は図中の矢印Ａ方向に移
動されるが、大スライド駒５と小スライド駒９は上述の
ように矢印Ａ方向には移動できないように規制されてお
り、図２において説明したように、中心コア１に向かう
矢印Ｂ、Ｃ方向の直径内側方向に移動を開始する。つま
り、アンギュラピン１８に対してガタなく潜入している
穴部５ｇ，９ｇにより、大スライド駒５には矢印Ｃ方向
に移動する分力が作用して中心に向かうことになる。In the above structure, when the resin is injected into the cavity and curing is waited for, and the molds are opened on the separation surfaces P1 and P2, the central core 1 is moved in the direction of arrow A in the figure, The slide piece 5 and the small slide piece 9 are restricted so as not to move in the arrow A direction as described above, and as described with reference to FIG. Start moving. That is, due to the holes 5g and 9g which sneak into the angular pin 18 without play, a component force moving in the direction of arrow C acts on the large slide piece 5 and moves toward the center.
【００３１】また、不図示の小スライド駒９にも矢印Ａ
方向に移動する分力が同様に作用して、中心コアの中心
に向かうことになるが、上述のように大スライド駒５の
傾斜角度θ１を４度にする一方、小スライド駒９の傾斜
角度θ２を倍の８度にしていることから、小スライド駒
９の矢印Ｂ方向の移動量は大スライド駒５の矢印Ｃ方向
の移動量の２倍あるので、小スライド駒９のほうが大ス
ライド駒５よりもの先に中心側に移動することから、直
径を縮小する方向に夫々の駒の移動できる。また、型開
き時のスライド駒５、９同士の干渉は防止される。An arrow A also appears on the small slide piece 9 (not shown).
The component force moving in the same direction acts toward the center of the central core in the same manner, but as described above, the inclination angle θ1 of the large slide piece 5 is set to 4 degrees while the inclination angle of the small slide piece 9 is set. Since θ2 is doubled to 8 degrees, the amount of movement of the small slide piece 9 in the direction of arrow B is twice the amount of movement of the large slide piece 5 in the direction of arrow C, so the small slide piece 9 is larger. Since it moves to the center side earlier than 5, each piece can be moved in the direction of reducing the diameter. Further, the interference between the slide pieces 5 and 9 when the mold is opened is prevented.
【００３２】一方、再度成形準備のために型閉めして矢
印Ａと逆方向に中心コア１の移動が行われると、スライ
ド駒５、９は矢印Ｂ、Ｃと逆方向に移動しつつ上方に移
動して図示の位置に移動されて成形準備状態にされる
が、スライド駒５、９の互いの合わせ目６、１０は上述
のように平行移動されて密着される構成であるので、合
わせ目６、１０の摩耗は発生しないことになる。さら
に、蟻溝係合構造は上述のように側面にアンダーカット
部位を形成しない至極単純な溝形状に加工すれば良いの
で、中心コア１並びに各スライド駒５、９の製作が簡単
になるので、加工費用が大幅に削減される。On the other hand, when the central core 1 is moved in the direction opposite to the arrow A and the slide cores 5 and 9 are moved in the direction opposite to the arrows B and C, the slide pieces 5 and 9 are moved upward while the mold is closed again for preparation for molding. Although the slide pieces 5 and 9 are moved to the positions shown in the drawing to be in a molding preparation state, the joints 6 and 10 of the slide pieces 5 and 9 are moved in parallel as described above to be in close contact with each other. No wear of 6, 10 will occur. Further, since the dovetail groove engaging structure may be processed into the extremely simple groove shape in which the undercut portion is not formed on the side surface as described above, the manufacture of the central core 1 and each slide piece 5, 9 becomes easy, Processing costs are greatly reduced.
【００３３】次に、図６は第４実施例に係る射出成形金
型の正面図である。本図において、基本構成は図１、２
により説明済なので詳細は同様の符号を付して説明を割
愛して相違部分に限定して述べると、中心コア１の蟻溝
に代えて、中心コア１の各傾斜面には凸状の案内部４０
が十字状に一体形成されている。また、大小のスライド
駒５、９には案内部４０に入り込んで摺動自在にされる
案内凹部７０が成形されている。以上説明の中心コアに
よれば、金型はさらに簡略にできる。Next, FIG. 6 is a front view of an injection molding die according to the fourth embodiment. In this figure, the basic configuration is shown in FIGS.
Since it has already been described, the details will be denoted by the same reference numerals and the description will be omitted to limit the description to the different parts. In place of the dovetail groove of the central core 1, a convex guide is provided on each inclined surface of the central core 1. Part 40
Are integrally formed in a cross shape. In addition, the large and small slide pieces 5 and 9 are formed with guide recesses 70 that are slidable by entering the guide portions 40. According to the central core described above, the mold can be further simplified.
【００３４】また、最後に、図７は第５実施例に係る中
心コアの正面図であって、スライド駒を４個以上設ける
ために中心コア１を図示のように６角形角錐で形成し
て、合計で６個のスライド駒を中心コアの放射状に移動
できるようにしている。以上説明したように、各実施例
によれば、中心コア１と各スライド駒５、９間の正確な
位置決めが合わせ面６、１０により実現できるのでキャ
ビティ精度の確保できるとともに、蟻溝係合部の摩耗防
止ができる。また、アインギュラピンを使用すれば、さ
らに簡単に構成可能なアンダーカット部を有する射出成
形金型を提供することができる。なお、上述の各実施例
においては、アンダーカット部をレンズ筒体において形
成されるヘリコイドネジとして形成される場合について
のみ述べたが、これに限定されることなく、アンダーカ
ット部を有する精密部品であればなんでも良い。Finally, FIG. 7 is a front view of the central core according to the fifth embodiment, in which the central core 1 is formed by a hexagonal pyramid as shown in order to provide four or more slide pieces. , A total of 6 slide pieces can be moved radially of the central core. As described above, according to each embodiment, the positioning accuracy between the central core 1 and each slide piece 5, 9 can be realized by the mating surfaces 6, 10, so that the cavity accuracy can be ensured and the dovetail groove engaging portion can be secured. Wear can be prevented. Further, by using the Eingular pin, it is possible to provide an injection molding die having an undercut portion that can be more easily configured. In addition, in each of the above-described embodiments, only the case where the undercut portion is formed as a helicoid screw formed in the lens barrel has been described, but the present invention is not limited to this, and a precision component having an undercut portion is used. Anything is fine.
【００３５】[0035]
【発明の効果】以上説明したように本発明によれば、中
心コアとスライド駒間の正確な位置決めができるので精
度の確保でき、蟻溝係合部の摩耗防止ができ、かつ比較
的簡単に構成可能なアンダーカット部を有する射出成形
金型を提供することができる。As described above, according to the present invention, since accurate positioning can be performed between the central core and the slide piece, accuracy can be ensured, wear of the dovetail groove engaging portion can be prevented, and relatively easily. It is possible to provide an injection molding die having a configurable undercut portion.
【図１】アンダーカット部を有する射出成形金型の第１
実施例に係る立体分解斜視図である。FIG. 1 is a first injection molding die having an undercut portion.
It is a three-dimensional disassembled perspective view which concerns on an Example.
【図２】図１の動作説明の外観斜視図である。FIG. 2 is an external perspective view for explaining the operation of FIG.
【図３】第２実施例に係るアンダーカット部を有する射
出成形金型の正面図である。FIG. 3 is a front view of an injection molding die having an undercut portion according to a second embodiment.
【図４】第３実施例に係るアンダーカット部を有する射
出成形金型の正面図である。FIG. 4 is a front view of an injection molding die having an undercut portion according to a third embodiment.
【図５】図４の中心コアとスライド駒を用いた射出成形
金型の要部破断図である。5 is a fragmentary cutaway view of an injection mold using the central core and the slide piece of FIG. 4. FIG.
【図６】第４実施例に係るアンダーカット部を有する射
出成形金型の正面図である。FIG. 6 is a front view of an injection molding die having an undercut portion according to a fourth embodiment.
【図７】第５実施例に係る中心コアの正面図である。FIG. 7 is a front view of a central core according to a fifth example.
【図８】従来のアンダーカット部を有する射出成形金型
の要部破断図である。FIG. 8 is a fragmentary cutaway view of a conventional injection molding die having an undercut portion.
１ 中心コア、 ２ 第１傾斜面 ３ 第２傾斜面 ４ 蟻溝 ５ 大スライド駒 ６ 合わせ面 ７ 凸溝部 ８ スライド面 ９ 小スライド駒 １０ 合わせ面 １１ スライド面 １２ ニゲ面 １８ アンギュラピン ２０ 成形位置である。 1 central core, 2 first inclined surface 3 second inclined surface 4 dovetail groove 5 large slide piece 6 mating surface 7 convex groove 8 slide surface 9 small slide piece 10 mating surface 11 slide surface 12 angular surface 18 angular pin 20 at the molding position is there.
Claims (6)
ない外寸法を変化するアンダーカット部を有してなり、
該中心コアの周囲を取り囲むようにしてキャビティ内に
配設される複数の開きコアを有する射出成形金型におい
て、 前記開きコア間の合わせ面を前記中心線に平行な平面で
形成するとともに、前記中心コアの前記移動に対して前
記開きコアを追動するように構成したことを特徴とする
アンダーカット部を有する射出成形金型。1. A center core that is gradually tapered, and an undercut portion whose outer dimensions change as the center core moves along a center line in the longitudinal direction,
In an injection-molding die having a plurality of open cores arranged in a cavity so as to surround the center core, a mating surface between the open cores is formed as a plane parallel to the center line, and An injection molding mold having an undercut portion, characterized in that the open core is configured to follow the movement of the central core.
成するために、 対向する側面を小傾斜角度と大傾斜角度とで形成した略
四角錐台形状に形成した前記中心コアと、 前記小傾斜角度の側面に沿って摺動移動するスライド面
と大円弧状ネジ部と前記合わせ面とを形成した１対の第
１開コアと、 前記大傾斜角度の側面に沿って摺動移動するスライド面
と小円弧状ネジ部と前記合わせ面とを形成した１対の第
２開コアと、 を具備してなり、前記移動により前記第２開コア側を前
記第１開コアよりも早く移動するように構成したことを
特徴とする請求項１に記載のアンダーカット部を有する
射出成形金型。2. The center core, which is formed into a substantially quadrangular truncated pyramid shape, in which opposite side surfaces are formed with a small inclination angle and a large inclination angle in order to form the undercut portion in an inner peripheral thread shape, and the small core. A pair of first open cores having a sliding surface slidably moving along the side surface of the slant angle, a large arcuate screw portion, and the mating surface, and a slide slidingly moving along the side surface of the large slant angle. A pair of second open cores each having a surface, a small arcuate threaded portion, and the mating surface, and moving the second open core side faster than the first open core by the movement. The injection-molding die having an undercut portion according to claim 1, which is configured as described above.
するスライド面と、前記大傾斜角度の側面に沿って摺動
移動するスライド面とを蟻溝係合して前記追動をするよ
うに構成することを特徴とする請求項１または請求項２
に記載のアンダーカット部を有する射出成形金型。3. The dovetail groove engagement between a slide surface slidingly moving along the side surface of the small inclination angle and a slide surface slidingly moving along the side surface of the large inclination angle to perform the pursuit. It is constituted as follows, Claim 1 or Claim 2 characterized by the above-mentioned.
An injection-molding die having an undercut portion as described in 1.
成形凹部を形成したことを特徴とする請求項１から請求
項３のいずれかに記載のアンダーカット部を有する射出
成形金型。4. The injection-molding die having an undercut portion according to claim 1, wherein a molding recess toward the center core is formed at the seam.
れる案内部に対して前記摺動移動する前記開きコアと、
該開きコアに一体的に形成される穴部を有するフランジ
部と、前記穴部に対して挿通されるアンギュラピンを可
動型に設けたことを特徴とする請求項１から請求項４の
いずれかに記載のアンダーカット部を有する射出成形金
型。5. The open core that slidably moves with respect to a guide portion formed along the side surface of the central core,
5. A flange portion having a hole formed integrally with the open core and an angular pin inserted into the hole are provided in a movable mold. An injection-molding die having an undercut portion as described in 1.
心コアを多角形角錐で形成したことを特徴とする請求項
１から請求項５のいずれかに記載のアンダーカット部を
有する射出成形金型。6. The injection molding having an undercut portion according to claim 1, wherein the central core is formed of a polygonal pyramid in order to provide four or more open cores. Mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3222642A JPH07106583B2 (en) | 1991-09-03 | 1991-09-03 | Injection mold with undercut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3222642A JPH07106583B2 (en) | 1991-09-03 | 1991-09-03 | Injection mold with undercut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0557760A true JPH0557760A (en) | 1993-03-09 |
| JPH07106583B2 JPH07106583B2 (en) | 1995-11-15 |
Family
ID=16785654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3222642A Expired - Fee Related JPH07106583B2 (en) | 1991-09-03 | 1991-09-03 | Injection mold with undercut |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07106583B2 (en) |
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|---|---|---|---|---|
| KR20010016443A (en) * | 2000-12-11 | 2001-03-05 | 이종오 | molding and carrying out device for negative screw |
| EP1179407A1 (en) * | 2000-05-17 | 2002-02-13 | Delta Plastics, Inc. | Apparatus and method for molding plastic closures |
| JP2008119917A (en) * | 2006-11-10 | 2008-05-29 | Aisin Chem Co Ltd | Injection-molding mold |
| WO2009069568A1 (en) * | 2007-11-27 | 2009-06-04 | Technocrats Corporation | Undercut processing mechanism |
| US20100113169A1 (en) * | 2007-04-10 | 2010-05-06 | Ryu Choong O | Mold for manufacturing composite drive shaft and composite drive shaft manufactured using the mold |
| JP2010167630A (en) * | 2009-01-21 | 2010-08-05 | Toshikage Yamada | Mold for injection molding |
| JP2011005756A (en) * | 2009-06-26 | 2011-01-13 | Toyoda Gosei Co Ltd | Molding mold and molding method |
| WO2010147613A3 (en) * | 2009-06-17 | 2011-03-03 | Progressive Components International Corporation | Lock for core assembly for injection molding tool |
| WO2012176565A1 (en) * | 2011-06-23 | 2012-12-27 | 住友ゴム工業株式会社 | Rigid core |
| WO2012176588A1 (en) * | 2011-06-24 | 2012-12-27 | 住友ゴム工業株式会社 | Rigid core |
| WO2012176564A1 (en) * | 2011-06-23 | 2012-12-27 | 住友ゴム工業株式会社 | Rigid core |
| US8585392B2 (en) | 2011-05-24 | 2013-11-19 | F&S Tool, Inc. | Compression molding with successive stage cooling channels |
| JP2014113788A (en) * | 2012-12-11 | 2014-06-26 | Technocrats Corp | Undercut processing mechanism |
| CN104552682A (en) * | 2014-12-05 | 2015-04-29 | 宁波方正汽车模具有限公司 | Hollow automobile filter element mold |
| CN104827634A (en) * | 2015-04-29 | 2015-08-12 | 耿晓冬 | Thread-demoulding mechanism for internal threads with large internal diameter and mould thereof |
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|---|---|---|---|---|
| EP1179407A1 (en) * | 2000-05-17 | 2002-02-13 | Delta Plastics, Inc. | Apparatus and method for molding plastic closures |
| KR20010016443A (en) * | 2000-12-11 | 2001-03-05 | 이종오 | molding and carrying out device for negative screw |
| JP2008119917A (en) * | 2006-11-10 | 2008-05-29 | Aisin Chem Co Ltd | Injection-molding mold |
| US20100113169A1 (en) * | 2007-04-10 | 2010-05-06 | Ryu Choong O | Mold for manufacturing composite drive shaft and composite drive shaft manufactured using the mold |
| US8459978B2 (en) * | 2007-04-10 | 2013-06-11 | Choong O Ryu | Method for manufacturing a composite drive shaft manufactured using mold |
| WO2009069568A1 (en) * | 2007-11-27 | 2009-06-04 | Technocrats Corporation | Undercut processing mechanism |
| CN101873915A (en) * | 2007-11-27 | 2010-10-27 | 株式会社技术可拉茨 | Undercut processing mechanism |
| JP2010167630A (en) * | 2009-01-21 | 2010-08-05 | Toshikage Yamada | Mold for injection molding |
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| WO2010147613A3 (en) * | 2009-06-17 | 2011-03-03 | Progressive Components International Corporation | Lock for core assembly for injection molding tool |
| EP2442956A4 (en) * | 2009-06-17 | 2013-07-10 | Progressive Components Int | Lock for core assembly for injection molding tool |
| JP2011005756A (en) * | 2009-06-26 | 2011-01-13 | Toyoda Gosei Co Ltd | Molding mold and molding method |
| US9475246B2 (en) | 2011-05-24 | 2016-10-25 | F&S Tool, Inc. | Method of molding and mold with succesive stage cooling channels |
| US8585392B2 (en) | 2011-05-24 | 2013-11-19 | F&S Tool, Inc. | Compression molding with successive stage cooling channels |
| JP2013006327A (en) * | 2011-06-23 | 2013-01-10 | Sumitomo Rubber Ind Ltd | Rigid core |
| JP2013006326A (en) * | 2011-06-23 | 2013-01-10 | Sumitomo Rubber Ind Ltd | Rigid core |
| WO2012176564A1 (en) * | 2011-06-23 | 2012-12-27 | 住友ゴム工業株式会社 | Rigid core |
| WO2012176565A1 (en) * | 2011-06-23 | 2012-12-27 | 住友ゴム工業株式会社 | Rigid core |
| JP2013006367A (en) * | 2011-06-24 | 2013-01-10 | Sumitomo Rubber Ind Ltd | Rigid core |
| WO2012176588A1 (en) * | 2011-06-24 | 2012-12-27 | 住友ゴム工業株式会社 | Rigid core |
| JP2014113788A (en) * | 2012-12-11 | 2014-06-26 | Technocrats Corp | Undercut processing mechanism |
| JPWO2015170574A1 (en) * | 2014-05-09 | 2017-04-20 | 新日鐵住金株式会社 | Mold and undercut molding method |
| US10029296B2 (en) | 2014-05-09 | 2018-07-24 | Nippon Steel & Sumitomo Metal Corporation | Forming die, and undercut forming method |
| KR20160142870A (en) | 2014-05-09 | 2016-12-13 | 신닛테츠스미킨 카부시키카이샤 | Molding die and undercut molding method |
| EP3000574A1 (en) * | 2014-09-28 | 2016-03-30 | Chuen Po Tong | Mold core for manufacturing container closure |
| CN104552682A (en) * | 2014-12-05 | 2015-04-29 | 宁波方正汽车模具有限公司 | Hollow automobile filter element mold |
| CN104827634A (en) * | 2015-04-29 | 2015-08-12 | 耿晓冬 | Thread-demoulding mechanism for internal threads with large internal diameter and mould thereof |
| CN107708959A (en) * | 2015-07-08 | 2018-02-16 | 赫斯基注塑系统有限公司 | Mold stack for injection machine |
| EP3319777A4 (en) * | 2015-07-08 | 2019-03-13 | Husky Injection Molding Systems Luxembourg IP Development S.à.r.l | Mold stack for injection molding machine |
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| US10870229B2 (en) | 2015-07-08 | 2020-12-22 | Husky Injection Molding Systems Ltd. | Mold stack for injection molding machine |
| KR101582589B1 (en) * | 2015-07-10 | 2016-01-05 | 이중재 | Injection mold for forming product having female screw surface |
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| CN110509501B (en) * | 2019-08-29 | 2024-05-10 | 广东机电职业技术学院 | Opposite-plug type sliding side concave die mechanism and control method |
Also Published As
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|---|---|
| JPH07106583B2 (en) | 1995-11-15 |
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