JP2000296539A - Production of hollow molded product having bellows - Google Patents
Production of hollow molded product having bellowsInfo
- Publication number
- JP2000296539A JP2000296539A JP11106238A JP10623899A JP2000296539A JP 2000296539 A JP2000296539 A JP 2000296539A JP 11106238 A JP11106238 A JP 11106238A JP 10623899 A JP10623899 A JP 10623899A JP 2000296539 A JP2000296539 A JP 2000296539A
- Authority
- JP
- Japan
- Prior art keywords
- pin
- molded product
- core pin
- mold
- spacer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、蛇腹部を有する中
空筒状の成形品の成形方法に関し、特に先端に貫通孔が
形成された成形品の脱型を円滑に行う成形方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a hollow cylindrical molded product having a bellows portion, and more particularly to a method of smoothly removing a molded product having a through hole at a tip end.
【０００２】[0002]
【従来の技術】蛇腹を有する略中空筒状の成形品として
は、例えば、自動車用ウェザーストリップのコーナー部
に位置する中空シールリップ内に挿入され、コーナー部
の曲率に沿って中空シールリップと共に屈曲しつつ、中
空シールリップの屈曲に伴う潰れやしわの発生を防止す
るスペーサーがある。2. Description of the Related Art As a substantially hollow cylindrical molded article having a bellows, for example, it is inserted into a hollow seal lip located at a corner of an automobile weather strip, and is bent together with the hollow seal lip along the curvature of the corner. In addition, there is a spacer that prevents crushing and wrinkling due to bending of the hollow seal lip.
【０００３】このスペーサーは、射出成形時において
は、一端が閉塞され他端が開放されたもので、その内外
周面が凹凸面形状となるように周壁部が蛇腹状に形成さ
れている。At the time of injection molding, this spacer is closed at one end and opened at the other end, and has a bellows-like peripheral wall portion so that the inner and outer peripheral surfaces have an uneven surface shape.
【０００４】上記スペーサーの中空部分は棒状の中子ピ
ンを用いることによって形成され、外型の型開き後、上
記中子ピンから吹き出したエアのエア圧によってスペー
サーを膨張させることにより、中子ピンからスペーサー
を離間させる。そして、脱型後に、スペーサーの閉塞さ
れた一端に貫通孔が形成される。[0004] The hollow portion of the spacer is formed by using a rod-shaped core pin. After the outer mold is opened, the spacer is inflated by the air pressure of the air blown out of the core pin. Separate the spacer from. After the mold is released, a through hole is formed at the closed end of the spacer.
【０００５】この貫通孔は、ドア開閉によってスペーサ
ーが押しつぶされた際にスペーサー内のエアを抜くもの
であって、スペーサー内部のエア圧が変化することによ
って、スペーサーの閉塞された一端が膨張、圧縮を繰り
返して、上記シールリップ内の所期の位置からスペーサ
ーがずれてしまうことを防止するため設けられている。[0005] This through-hole is for releasing air in the spacer when the spacer is crushed by opening and closing the door. When the air pressure inside the spacer changes, one closed end of the spacer expands and compresses. Is provided to prevent the spacer from being displaced from an intended position in the seal lip.
【０００６】[0006]
【発明が解決しようとする課題】しかし、上記貫通孔
は、射出成形時にスペーサーに形成してしまうと、中子
ピンからスペーサーを離間させる際に上記スペーサー内
に吹き出すエアが、この貫通孔から外部に放出されてし
まい、中子ピンからスペーサーをうまく離間させること
ができないため、脱型後の別工程で上記貫通孔の孔空け
加工を行わなければならないという問題がある。However, if the through hole is formed in the spacer at the time of injection molding, the air blown into the spacer when the spacer is separated from the core pin will be discharged from the through hole to the outside. And the spacer cannot be properly separated from the core pin. Therefore, there is a problem that the through-hole must be formed in another step after the mold release.
【０００７】そして、この孔空け加工は、スペーサー先
端部に治具を挿入しパンチ加工等によって貫通孔を形成
するため、貫通孔の形成位置にバラツキが生じやすいと
いう問題がある。また、スペーサー先端部内部には、い
わゆる肉溜まりが出来やすく、パンチ加工用の治具の挿
入に時間がかかると共に、パンチ加工用の治具が大がか
りになりなる等、大量生産に対する対応が困難となって
いる。[0007] In this hole forming process, a jig is inserted into the distal end portion of the spacer and a through hole is formed by punching or the like. Therefore, there is a problem that the position where the through hole is formed tends to vary. In addition, it is difficult to cope with mass production, such as the fact that so-called meat pockets are easily formed inside the tip of the spacer, it takes time to insert the jig for punching, and the jig for punching becomes large. Has become.
【０００８】[0008]
【課題を解決するための手段】請求項１に記載の発明
は、閉塞された先端に貫通孔が形成され、かつ基端が開
放されていると共に、周壁が蛇腹状に形成された中空筒
状の成形品の製造方法において、成形品の開放端側の端
部が支持された略筒状の中子ピンを該中子ピンの軸心と
平行な型合わせ面を持つ外型で挟むようにして型締め
し、かつ上記中子ピンに収容された胴体部と、成形品の
閉塞端側の上記中子ピン端部開口から突出し、上記胴体
部と連続する基底面が該胴体部より大径となり、成形品
の閉塞端側の端部に向かうに従い外径が小さくなる略円
錐形状を呈すると共に、外周面に全周に亙って階段状に
縮径された少なくとも２段の階段面を有する頭部と、か
らなる突き出しピンの上記頭部外周面を、上記貫通孔を
形成するべく上記外型の開閉に連動する押さえピンで支
持した状態で、上記中子ピン、上記突き出しピン及び上
記外型によって画成されたキャビティに所定の成形材料
を射出する工程と、型開き時に中子ピン及び突き出しピ
ンを成形品と伴に上記外型及び押さえピンから型抜きす
る工程と、上記外型からの型抜き後、上記突き出しピン
を上記中子ピンに対して成形品の閉塞端側に向かって押
し出すと同時に、上記突き出しピン頭部の基底面と上記
中子ピンの端面との隙間から成形品内部にエアを吹き込
み、成形品の蛇腹状の周壁を上記中子ピンから離間さ
せ、かつ上記突き出しピンの頭部から成形品を離間させ
る工程と、を含むことを特徴としている。これによっ
て、閉塞端に貫通孔が形成された成形品を、成形品内に
エアを送り込むことで中子ピンから容易に離間させるこ
とできる。また、射出成形時、押さえピンによって、突
き出しピンの頭部が固定されるので、成形品の肉厚を均
一にすることができる。According to a first aspect of the present invention, there is provided a hollow cylindrical member having a closed end formed with a through hole, a base end opened, and a peripheral wall formed in a bellows shape. In the method for manufacturing a molded product according to the above, the mold is formed such that a substantially cylindrical core pin having an open end side supported by the molded product is sandwiched by an outer mold having a mold mating surface parallel to the axis of the core pin. Tightened, and the body portion accommodated in the core pin, and protruding from the core pin end opening on the closed end side of the molded product, the base surface continuous with the body portion has a larger diameter than the body portion, A head having a substantially conical shape in which the outer diameter decreases toward the closed end side end of the molded product, and having at least two steps of stepped diameter reduced on the outer peripheral surface in a stepwise manner over the entire circumference; The outer peripheral surface of the head portion of the protruding pin formed of the outer mold so as to form the through hole. A step of injecting a predetermined molding material into the cavity defined by the core pin, the ejection pin and the outer mold while being supported by a holding pin that is linked to opening and closing, and a core pin and an ejection pin when the mold is opened. Removing the mold from the outer mold and the holding pin together with the molded product, and after removing the mold from the outer mold, extruding the protruding pin against the core pin toward the closed end side of the molded product. At the same time, air is blown into the molded product from the gap between the base surface of the protruding pin head and the end surface of the core pin, the bellows-shaped peripheral wall of the molded product is separated from the core pin, and the Separating the molded article from the head. Thus, the molded product having the through hole formed at the closed end can be easily separated from the core pin by sending air into the molded product. Also, at the time of injection molding, the head of the protruding pin is fixed by the pressing pin, so that the thickness of the molded product can be made uniform.
【０００９】請求項２に記載の発明は、請求項１に記載
の発明において、上記突き出しピンの頭部基底面はテー
パ状を呈し、所定の成形材料を射出する工程において、
上記基底面と対向する中子ピン端面と、該基底面との間
隙が、全周に亙って断面略楔形状を呈していることを特
徴としている。これによって、中子ピンから成形品を離
間させる際にスペーサー内に送り込まれたエアが、成形
品の貫通孔が形成された先端に流入することを更に確実
に防止することができる。According to a second aspect of the present invention, in the first aspect, the base surface of the head of the protrusion pin has a tapered shape, and in the step of injecting a predetermined molding material,
A gap between the core pin end face facing the base face and the base face has a substantially wedge-shaped cross section over the entire circumference. Accordingly, it is possible to more reliably prevent the air sent into the spacer when the molded product is separated from the core pin from flowing into the tip of the molded product where the through hole is formed.
【００１０】[0010]
【発明の実施の形態】本発明の一実施例を図面に基づい
て詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings.
【００１１】図２〜図８は図１に示すゴム製のスペーサ
ー２を射出成形する場合の例を示している。このスペー
サー２は、略筒状の周壁４が蛇腹状に形成されていると
共に、略円錐形状を呈した先端６の外周面には４つ貫通
孔８が形成されている。FIGS. 2 to 8 show examples in which the rubber spacer 2 shown in FIG. 1 is injection-molded. The spacer 2 has a substantially cylindrical peripheral wall 4 formed in a bellows shape, and four through holes 8 formed in an outer peripheral surface of a substantially conical tip 6.
【００１２】図２に示すように、射出成形に用いる金型
は、互いに対向する一対の外型１０，１０と、略円筒状
の中子ピン１２と、この中子ピン１２に収容された略筒
状の突き出しピン１４と、から大略構成されている。As shown in FIG. 2, a mold used for injection molding includes a pair of outer dies 10, 10 facing each other, a substantially cylindrical core pin 12, and a substantially cylindrical core housed in the core pin 12. And a projecting pin 14 having a cylindrical shape.
【００１３】上記一対の外型１０，１０の互いに対向す
る型合わせ面１６，１６には、型締め時にキャビティと
なる凹部１８のほか、中子ピン支持装置２０を収容する
凹部２２が形成されている。On the opposing mold mating surfaces 16 of the pair of outer dies 10, a concave portion 22 for accommodating a core pin supporting device 20 is formed in addition to a concave portion 18 serving as a cavity at the time of mold clamping. I have.
【００１４】上記中子支持装置２０のホルダブロック２
４の下面には、型締め時にキャビティに収容される上記
中子ピン１２が上記型合わせ面１６，１６と平行となる
ように固定されている。上記中子ピン１２の外周面はス
ペーサー２の内周面形状に対応した凹凸面形状となって
いる。The holder block 2 of the core supporting device 20
The core pin 12 housed in the cavity at the time of mold clamping is fixed to the lower surface of the mold 4 so as to be parallel to the mold mating surfaces 16, 16. The outer peripheral surface of the core pin 12 has an uneven surface shape corresponding to the inner peripheral surface shape of the spacer 2.
【００１５】上記突き出しピン１４は、図３に示すよう
に、上記中子ピン１２に上下動可能に収容された略円筒
状の胴体部２６と、この胴体部２６から連続するテーパ
状の基底面２８が該胴体部２６より大径となり、スペー
サー２の先端６側の端部に向かうに従い外径が小さくな
る略円錐形状の頭部３０と、からなっている。As shown in FIG. 3, the protruding pin 14 has a substantially cylindrical body 26 accommodated in the core pin 12 so as to be vertically movable, and a tapered base surface continuous from the body 26. 28 has a substantially conical head 30 whose diameter is larger than that of the body part 26 and whose outer diameter decreases toward the end on the tip 6 side of the spacer 2.
【００１６】上記胴体部２６は、上記中子ピン１２の内
周面に取り付けられた円環状のシール材３２に摺動可能
に密着している。そして、上記胴体部２６が中子ピンに
収容された状態において、上記胴体部２６の上記シール
材３２より上記頭部３０側の位置には、図示せぬ切換弁
を介して上記胴体部２６内部に導入された空気をスペー
サー２内部に放出する空気孔３４が設けられている。The body portion 26 is slidably adhered to an annular seal member 32 attached to the inner peripheral surface of the core pin 12. When the body 26 is housed in the core pin, the position of the body 26 closer to the head 30 than the sealing material 32 is connected to the inside of the body 26 via a switching valve (not shown). An air hole 34 for discharging the air introduced into the space 2 into the spacer 2 is provided.
【００１７】上記頭部３０は、上記中子ピン１２の端面
より突出していると共に、外周面に全周に亙って階段状
に縮径された２段の階段面３６，３６が形成されてい
る。また、上記外型１０，１０には、この外型１０，１
０の開閉に連動し、型締め時にキャビティ内に収容され
た上記突き出しピン１２の頭部３０を支持する４つの押
さえピン３８が設けられている。The head 30 protrudes from the end face of the core pin 12 and has two stepped surfaces 36, 36 whose diameter is reduced stepwise over the entire outer circumference. I have. In addition, the outer dies 10, 1
In conjunction with the opening and closing of 0, four holding pins 38 are provided for supporting the head 30 of the protruding pin 12 housed in the cavity at the time of mold clamping.
【００１８】以上のように構成された金型構造により図
１に示すスペーサー２を成形するにあたっては、上記一
対の外型１０，１０によって上記中子ピン１２を挟むよ
うに型締めし、かつ上記一対の外型１０，１０にそれぞ
れ２つずつ設けられた上記押さえピン３８によって、上
記突き出しピン１４の頭部３０が支持された状態で、上
記中子ピン１２、上記一対の外型１０，１０及び上記突
き出しピン１４の頭部３０によって画成されたキャビテ
ィに、ゴム製の成形材料を射出する。When the spacer 2 shown in FIG. 1 is formed by the above-configured mold structure, the pair of outer dies 10 and 10 clamp the core pin 12 so as to sandwich it, and The core pin 12 and the pair of outer dies 10, 10 are held in a state where the heads 30 of the protruding pins 14 are supported by the holding pins 38 provided two by two on the pair of outer dies 10, 10, respectively. Then, a rubber molding material is injected into the cavity defined by the head 30 of the protruding pin 14.
【００１９】成形材料の射出が終了すると、上記一対の
外型１０，１０は型開きされ、上記中子ピン１２及び上
記突き出しピン１４と共に、スペーサー２が型抜きされ
る。When the injection of the molding material is completed, the pair of outer dies 10, 10 are opened, and the spacer 2 is die-cut together with the core pins 12 and the protruding pins 14.
【００２０】次に、図４に示すように、上記突き出しピ
ン１４をスペーサー２の先端６側に向かって押し出し、
上記頭部３０の基底面２８と上記中子ピン１２の端面と
の間に環状の隙間４２を形成すると同時に、上記胴体部
２６にエアが送られ、上記空気孔３４から吹き出したエ
アが、上記スペーサー２内部の隙間４２に送り込まれ
る。Next, as shown in FIG. 4, the protruding pin 14 is pushed out toward the distal end 6 of the spacer 2, and
At the same time as forming an annular gap 42 between the base surface 28 of the head 30 and the end face of the core pin 12, air is sent to the body 26, and the air blown out from the air holes 34 It is fed into the gap 42 inside the spacer 2.
【００２１】上記スペーサー２内部に送り込まれたエア
は、図５に示すように、上記スペーサー２の先端６を若
干膨張させるが、上記頭部３０に形成された階段面３
６，３６によって、上記貫通孔８にエアが流入すること
はなく、上記スペーサー２の蛇腹状の周壁４を上記中子
ピン１２から離間させる。The air fed into the spacer 2 slightly inflates the tip 6 of the spacer 2 as shown in FIG. 5, but the stepped surface 3 formed on the head 30
Due to 6, 36, air does not flow into the through-hole 8, and the bellows-shaped peripheral wall 4 of the spacer 2 is separated from the core pin 12.
【００２２】尚、上記空気孔３４から吹き出したエア
は、シール材３２によって、スペーサー２基端側の中子
ピン端部から外部に流出することはない。The air blown out from the air hole 34 does not flow out of the core pin end of the spacer 2 to the outside due to the sealing material 32.
【００２３】そして、図６及び図７に示すように、上記
突き出しピン１４の頭部３０をスペーサー２の先端６内
側に押し付けた状態で、上記中子ピン１２を上記スペー
サー２から引き抜きつつ、上記スペーサー２内のエア圧
力の上昇を利用し、上記中子ピン１２が上記スペーサー
２から完全に引き抜かれる前に、上記スペーサー２の先
端６を上記突き出しピン１４の頭部３０から離間させ
る。As shown in FIGS. 6 and 7, with the head 30 of the protruding pin 14 pressed against the inside of the distal end 6 of the spacer 2, the core pin 12 is pulled out of the spacer 2 while being pulled out. Utilizing the increase in the air pressure in the spacer 2, the tip 6 of the spacer 2 is separated from the head 30 of the protruding pin 14 before the core pin 12 is completely pulled out of the spacer 2.
【００２４】このようなスペーサー２の製造方法によれ
ば、一対の外型１０，１０にぞれぞれ突出形成された押
さえピン３８によって突き出しピン１４が保持された状
態で、成形材料が注入されるので、上記突き出しピン１
４及び上記中子ピン１２がキャビティ内に偏って位置す
ることがなく、所期の位置に固定されるので、スペーサ
ー２の肉厚が偏肉せず、常に安定した品質の自動成形を
することができる。According to the method of manufacturing the spacer 2, the molding material is injected in a state where the protruding pins 14 are held by the press pins 38 protruding from the pair of outer dies 10, 10, respectively. Therefore, the protruding pin 1
Since the core 4 and the core pin 12 are not positioned unevenly in the cavity and are fixed at the expected positions, the thickness of the spacer 2 is not uneven, and automatic molding of stable quality is always performed. Can be.
【００２５】また、上記押さえピン３８によって、上記
スペーサー２の先端６に貫通孔８を形成することができ
るので、射出成形後の後工程で改めて孔を開ける必要が
なく、大量生産に容易に対応することができる。Further, since the through-hole 8 can be formed at the tip 6 of the spacer 2 by the holding pin 38, it is not necessary to make a new hole in a post-process after the injection molding, and it can easily cope with mass production. can do.
【００２６】特に、上記突き出しピン１４の頭部３０の
外周面に形成された２段の階段面３６，３６によって、
スペーサー２から上記中子ピン１２を離間させる際に、
スペーサー２内に送り込まれるエアのスペーサー２の先
端６側への流入が防止されるので、上記先端６に形成さ
れた貫通孔８から外部にエアが放出されることがなく、
上記中子ピン１２と上記スペーサー２との離間が確実に
行えると共に、上記中子ピン１２と上記スペーサー２と
の離間過程で、上記スペーサー２内のエア圧力が徐々に
増大していくので、上記中子ピン１２を上記スペーサー
２から引き抜かれる際には、スペーサー２内部のエア圧
力によって上記突き出しピン１４と上記スペーサー２と
を確実に離間させておくことができる。In particular, the two-step step surfaces 36, 36 formed on the outer peripheral surface of the head 30 of the protruding pin 14
When separating the core pin 12 from the spacer 2,
Since the air sent into the spacer 2 is prevented from flowing into the tip 6 side of the spacer 2, the air is not released to the outside from the through hole 8 formed in the tip 6,
Since the separation between the core pin 12 and the spacer 2 can be reliably performed, and in the process of separating the core pin 12 and the spacer 2, the air pressure in the spacer 2 gradually increases. When the core pin 12 is pulled out from the spacer 2, the protrusion pin 14 and the spacer 2 can be reliably separated by the air pressure inside the spacer 2.
【００２７】また、上記階段面３６，３６は、図３に示
すように、突き出しピン１４軸方向の長さＡを２ｍｍ、
縮径量Ｂを０．２ｍｍ程度にそれぞれ形成することで上
述の作用効果を得ることができる。すなわち、上記階段
面３６，３６の形成範囲及び縮径の割合を非常に小さく
設定することができるので、上記スペーサー２の表面に
ヒケを出すことなく成型品であるスペーサー２を製造す
ることができる。As shown in FIG. 3, the stair surfaces 36, 36 have a length A in the axial direction of the protruding pin 14 of 2 mm,
The above-described effects can be obtained by forming the diameter reduction amount B to about 0.2 mm. That is, since the formation range and the ratio of the diameter reduction of the step surfaces 36, 36 can be set very small, the spacer 2 which is a molded product can be manufactured without sink marks on the surface of the spacer 2. .
【００２８】さらに上記頭部３０の基底面２８と上記中
子ピン１２の端面との間隙が、全周に亙って断面略楔形
状を呈し、この間隙によって形成された突起部４４のス
ペーサー２の先端６側の側面が、上記スペーサー２の半
径方向に平行な平面に対して傾き、かつ上記スペーサー
２の蛇腹状の周壁４側の側面が上記スペーサー２の半径
方向に平行に形成されているので、当初、スペーサー２
内に送り込まれたエアが、スペーサー２の先端６側に一
層流入しにくくなり、蛇腹状の周壁４と中子ピン１２を
確実に離間させることができる。Further, the gap between the base surface 28 of the head 30 and the end face of the core pin 12 has a substantially wedge-shaped cross section over the entire circumference, and the spacer 2 of the projection 44 formed by this gap is formed. Of the spacer 2 is inclined with respect to a plane parallel to the radial direction of the spacer 2, and the side surface of the spacer 2 on the side of the bellows-shaped peripheral wall 4 is formed parallel to the radial direction of the spacer 2. So, initially, spacer 2
The air sent into the inside becomes more difficult to flow into the distal end 6 side of the spacer 2, and the bellows-shaped peripheral wall 4 and the core pin 12 can be reliably separated.
【００２９】そして、上記頭部３０の基底面２８がテー
パ状に形成されているので、図８に示すように、上記突
き出しピン１４を上記スペーサー２から引き抜く際にス
ペーサー２の位置が突き出しピン１４に対してずれて
も、スペーサー２の蛇腹状の周壁４に引っかかることな
く脱型させることができる。Since the base surface 28 of the head 30 is formed in a tapered shape, as shown in FIG. 8, when the protrusion pin 14 is pulled out from the spacer 2, the position of the spacer 2 is changed. , It can be removed without being caught on the bellows-shaped peripheral wall 4 of the spacer 2.
【００３０】[0030]
【発明の効果】本発明の請求項１に記載の発明によれ
ば、成形品の射出成形時に、成形品の閉塞端に貫通孔が
形成することができるので、次工程で貫通孔を形成する
必要がなく、コストダウン及び大量生産に容易に対応す
ることができる。According to the first aspect of the present invention, a through hole can be formed at the closed end of a molded product during injection molding of the molded product, so that the through hole is formed in the next step. There is no need, and it is possible to easily cope with cost reduction and mass production.
【００３１】また、上記貫通孔を形成するため、上記突
き出しピンの頭部が押さえピンによって固定した状態で
射出成形が行われるので、成形品の肉厚を均一にするこ
とができ、品質の安定した成形品を自動で成形すること
ができる。In addition, since the injection hole is formed in a state where the head of the protruding pin is fixed by the holding pin, the thickness of the molded product can be made uniform and the quality can be stabilized. The molded product can be molded automatically.
【００３２】また、本発明の請求項２に記載の発明によ
れば、中子ピンから成形品を離間させる際に、貫通孔が
形成された成形品の閉塞端側にエアが一層流入しにくく
なるので、中子ピンと成形品の離間をさらに容易に行う
ことができる。According to the second aspect of the present invention, when the molded product is separated from the core pin, air is less likely to flow into the closed end side of the molded product in which the through hole is formed. Therefore, the core pin and the molded product can be separated more easily.
【図１】本発明に係る蛇腹を有する中空成形品の製造方
法によって成形されたスペーサーの斜視図。FIG. 1 is a perspective view of a spacer formed by a method of manufacturing a hollow molded article having a bellows according to the present invention.
【図２】本発明に係る蛇腹を有する中空成形品の製造方
法に用いる金型の型開き時の説明図。FIG. 2 is an explanatory view of a mold used in the method of manufacturing a hollow molded article having a bellows according to the present invention when the mold is opened.
【図３】本発明に係る蛇腹を有する中空成形品の製造方
法に用いる金型の型締め時における要部断面図。FIG. 3 is a cross-sectional view of a main part of the mold used in the method of manufacturing a hollow molded article having a bellows according to the present invention when the mold is closed.
【図４】本発明の実施の形態を示す図で、成形品である
スペーサー内部にエアが送り込まれる直前の状態を示す
工程説明図。FIG. 4 is a view showing an embodiment of the present invention, and is an explanatory process diagram showing a state immediately before air is fed into a spacer which is a molded product.
【図５】本発明の実施の形態を示す図で、成形品である
スペーサー内部にエアが送り込まれた時の状態を示す工
程説明図。FIG. 5 is a view showing the embodiment of the present invention, and is an explanatory view of a process showing a state when air is fed into a spacer which is a molded product.
【図６】本発明の実施の形態を示す図で、成形品である
スペーサーから中子ピンを抜き出している時の状態を示
す工程説明図。FIG. 6 is a view showing the embodiment of the present invention, and is a process explanatory view showing a state where a core pin is pulled out from a spacer which is a molded product.
【図７】本発明の実施の形態を示す図で、成形品である
スペーサーから中子ピンを抜き出される直前の状態を示
す工程説明図。FIG. 7 is a view showing the embodiment of the present invention, and is a process explanatory view showing a state immediately before a core pin is extracted from a spacer which is a molded product.
【図８】本発明の実施の形態を示す図で、成形品である
スペーサーから突き出しピンを引き抜いている状態を示
す工程説明図。FIG. 8 is a diagram illustrating the embodiment of the present invention, and is an explanatory process diagram showing a state in which a protruding pin is pulled out from a spacer which is a molded product.
スペーサー…２ 外型…１０ 中子ピン…１２ 突き出しピン…１４ 胴体部…２６ 基底面…２８ 頭部…３０ 階段面…３６ 押さえピン…３８ Spacer ... 2 Outer die ... 10 Core pin ... 12 Projection pin ... 14 Body part ... 26 Base bottom face ... 28 Head ... 30 Step surface ... 36 Holding pin ... 38
フロントページの続き (72)発明者 緑川 和彦 千葉県千葉市稲毛区長沼町330番地 鬼怒 川ゴム工業株式会社内 Ｆターム(参考） 4F202 AA45 AG10 AG23 AG28 AH23 CA11 CK81 CM03 Continued on the front page (72) Inventor Kazuhiko Midorikawa 330F, Naganuma-cho, Inage-ku, Chiba-shi, Chiba Kinu Kawa Rubber Industries, Ltd. F-term (reference) 4F202 AA45 AG10 AG23 AG28 AH23 CA11 CK81 CM03
Claims (2)
つ基端が開放されていると共に、周壁が蛇腹状に形成さ
れた中空筒状の成形品の製造方法において、成形品の開
放端側の端部が支持された略筒状の中子ピンを該中子ピ
ンの軸心と平行な型合わせ面を持つ外型で挟むようにし
て型締めし、かつ上記中子ピンに収容された胴体部と、
成形品の閉塞端側の上記中子ピン端部開口から突出し、
上記胴体部と連続する基底面が該胴体部より大径とな
り、成形品の閉塞端側の端部に向かうに従い外径が小さ
くなる略円錐形状を呈すると共に、外周面に全周に亙っ
て階段状に縮径された少なくとも２段の階段面を有する
頭部と、からなる突き出しピンの上記頭部外周面を、上
記貫通孔を形成するべく上記外型の開閉に連動する押さ
えピンで支持した状態で、上記中子ピン、上記突き出し
ピン及び上記外型によって画成されたキャビティに所定
の成形材料を射出する工程と、型開き時に中子ピン及び
突き出しピンを成形品と伴に上記外型及び押さえピンか
ら型抜きする工程と、上記外型からの型抜き後、上記突
き出しピンを上記中子ピンに対して成形品の閉塞端側に
向かって押し出すと同時に、上記突き出しピン頭部の基
底面と上記中子ピンの端面との隙間から成形品内部にエ
アを吹き込み、成形品の蛇腹状の周壁を上記中子ピンか
ら離間させ、かつ上記突き出しピンの頭部から成形品を
離間させる工程と、を含むことを特徴とする蛇腹を有す
る中空成形品の製造方法。1. A method of manufacturing a hollow cylindrical molded product having a closed end with a through hole formed at a closed end, a base end opened, and a bellows-shaped peripheral wall. A substantially cylindrical core pin having a supported end is clamped by an outer mold having a mold mating surface parallel to the axis of the core pin, and the body is accommodated in the core pin. Department and
Projecting from the core pin end opening on the closed end side of the molded product,
The base surface continuous with the body portion has a larger diameter than the body portion, has a substantially conical shape in which the outer diameter decreases toward the closed end side end of the molded product, and has an outer peripheral surface extending over the entire circumference. A head having at least two steps that are stepwise reduced in diameter, and supporting the outer peripheral surface of the head by a pressing pin interlocking with opening and closing of the outer die to form the through hole; In this state, a step of injecting a predetermined molding material into the cavity defined by the core pin, the protruding pin and the outer mold, and the step of injecting the core pin and the protruding pin together with the molded product when the mold is opened. A step of removing the mold from the mold and the holding pin, and after removing the mold from the outer mold, simultaneously pushing the ejection pin toward the closed end side of the molded product with respect to the core pin, and simultaneously Base and core pin Blowing air into the inside of the molded product from a gap with the end surface, separating the bellows-shaped peripheral wall of the molded product from the core pin, and separating the molded product from the head of the protruding pin. A method for producing a hollow molded article having a bellows.
状を呈し、所定の成形材料を射出する工程において、上
記基底面と対向する中子ピン端面と、該基底面との間隙
が、全周に亙って断面略楔形状を呈していることを特徴
とする請求項１に記載の蛇腹を有する中空成形品の製造
方法。2. The base bottom surface of the head of the protruding pin has a tapered shape, and in the step of injecting a predetermined molding material, the gap between the core pin end surface facing the base surface and the base surface is entirely reduced. The method for producing a hollow molded article having a bellows according to claim 1, wherein the hollow molded article has a substantially wedge-shaped cross section over the circumference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11106238A JP2000296539A (en) | 1999-04-14 | 1999-04-14 | Production of hollow molded product having bellows |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11106238A JP2000296539A (en) | 1999-04-14 | 1999-04-14 | Production of hollow molded product having bellows |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000296539A true JP2000296539A (en) | 2000-10-24 |
Family
ID=14428550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11106238A Pending JP2000296539A (en) | 1999-04-14 | 1999-04-14 | Production of hollow molded product having bellows |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000296539A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011158517A1 (en) * | 2010-06-18 | 2011-12-22 | 日東電工株式会社 | Method for producing perforated hollow tube and mold form for producing perforated hollow tube |
| KR101234632B1 (en) | 2010-06-25 | 2013-02-19 | 현대자동차주식회사 | Injection mold for intake hose and production method using the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08164540A (en) * | 1994-12-14 | 1996-06-25 | Atoraizu Yodogawa:Kk | Injection molding method for resin hollow molding and injection mold structure therefor |
| JPH10202705A (en) * | 1997-01-29 | 1998-08-04 | Kinugawa Rubber Ind Co Ltd | Molding of molded product having bellows part |
-
1999
- 1999-04-14 JP JP11106238A patent/JP2000296539A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08164540A (en) * | 1994-12-14 | 1996-06-25 | Atoraizu Yodogawa:Kk | Injection molding method for resin hollow molding and injection mold structure therefor |
| JPH10202705A (en) * | 1997-01-29 | 1998-08-04 | Kinugawa Rubber Ind Co Ltd | Molding of molded product having bellows part |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011158517A1 (en) * | 2010-06-18 | 2011-12-22 | 日東電工株式会社 | Method for producing perforated hollow tube and mold form for producing perforated hollow tube |
| KR101234632B1 (en) | 2010-06-25 | 2013-02-19 | 현대자동차주식회사 | Injection mold for intake hose and production method using the same |
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