JP2004291614A - Blow-needle - Google Patents

Blow-needle Download PDF

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JP2004291614A
JP2004291614A JP2003275771A JP2003275771A JP2004291614A JP 2004291614 A JP2004291614 A JP 2004291614A JP 2003275771 A JP2003275771 A JP 2003275771A JP 2003275771 A JP2003275771 A JP 2003275771A JP 2004291614 A JP2004291614 A JP 2004291614A
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parison
blow
blow needle
needle
main body
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JP4214018B2 (en
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Satoshi Kato
智 加藤
Takanori Sawano
隆則 澤野
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Yachiyo Industry Co Ltd
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Yachiyo Industry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To reduce resistance that occurs when a blow needle is inserted in a parison, inhibiting dripping into an interior side of the parison, suppress deformation of a through hole formed in the parison by insertion. <P>SOLUTION: The blow-needle 11 is mainly composed of a tip portion in addition to bevelled surfaces 13a, 13b and 13c, a surrounding wall 14, a hollow portion 15 and an opening portion 16. The bevelled surfaces 13a, 13b and 13c are composed of the bevelled surface that can be spread in a tapered shape ranging from the tip portion 12 toward the surrounding wall 14. The bevelled surfaces 13a, 13b and 13c are arranged so as to form the three surfaces in a nearly triangular pyramid shape having a tip portion 12 as one of the vertexes. Each one of the bevelled portions 13a, 13b and 13c is recessed on its surface as it ranges from a side formed between two adjacent bevelled portions to an interior side of the respective bevelled portions 13a, 13b and 13c. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、中空成形用金型に保持されたパリソンに側方から挿入され、パリソン内に流体を流出または流入するブローニードルに関する。   The present invention relates to a blow needle that is inserted from the side into a parison held in a hollow molding die and flows or flows fluid into or out of the parison.

樹脂製品の中空成形で使用されるブローニードルの従来例として、例えば、特許文献１や特許文献２に開示されたものが挙げられる。   Conventional examples of blow needles used in hollow molding of resin products include, for example, those disclosed in Patent Literature 1 and Patent Literature 2.

図７は、特許文献１に記載の中空成形用ブローピンを示す概略図であり、（ａ）は斜視図、（ｂ）は横からみた断面図、（ｃ）は正面図、（ｄ）は軸線視断面図である。中空成形用ブローピン４１は、主に斜面４２、筒状本体４３、貫通孔４４およびノズル孔４５から構成されている。中空成形ブローピン４１は、斜面４２側からパリソン（図示せず）に挿入される。そして、貫通孔４４からノズル孔４５を通じて、流体をパリソン内に噴射する。   FIGS. 7A and 7B are schematic diagrams showing a blow molding blow pin described in Patent Document 1, wherein FIG. 7A is a perspective view, FIG. 7B is a cross-sectional view as viewed from the side, FIG. 7C is a front view, and FIG. FIG. The blow molding blow pin 41 mainly includes a slope 42, a cylindrical main body 43, a through hole 44, and a nozzle hole 45. The hollow molding blow pin 41 is inserted into a parison (not shown) from the slope 42 side. Then, the fluid is injected into the parison from the through hole 44 through the nozzle hole 45.

図８は、特許文献２に記載の針吹きノズルを示す概略図であり、（ａ）は斜視図、（ｂ）は横からみた断面図、（ｃ）は正面図、（ｄ）は軸線視断面図である。針吹きノズル５１は、主に針中心５２、斜面５３ａ・５３ｂ・５３ｃ・５３ｄ、筒状本体５４、中空部５５ａ・５５ｂおよびノズル孔５６ａ・５６ｂから構成されている。針吹きノズル５１は、針中心５２側からパリソン（図示せず）に挿入される。そして、中空部５５ａからノズル孔５６ａを通じて、流体をパリソン内に噴射する。また、パリソン内の流体を、ノズル孔５６ｂから中空部５５ｂを通じてパリソン外部に排出する。
特開平６−１８２８６６号公報（段落００１５〜００１７、図３） 特開２０００−１０２９７１号公報（段落０００６〜００１４、図１） FIGS. 8A and 8B are schematic views showing a needle blowing nozzle described in Patent Document 2, wherein FIG. 8A is a perspective view, FIG. 8B is a cross-sectional view as viewed from the side, FIG. 8C is a front view, and FIG. It is sectional drawing. The needle blowing nozzle 51 mainly includes a needle center 52, slopes 53a, 53b, 53c, 53d, a cylindrical main body 54, hollow portions 55a, 55b, and nozzle holes 56a, 56b. The needle blowing nozzle 51 is inserted into a parison (not shown) from the needle center 52 side. Then, a fluid is injected into the parison from the hollow portion 55a through the nozzle hole 56a. The fluid in the parison is discharged from the nozzle hole 56b to the outside of the parison through the hollow portion 55b.
JP-A-6-182866 (paragraphs 0015 to 0017, FIG. 3) JP 2000-102971 A (paragraphs 0006 to 0014, FIG. 1)

しかしながら、特許文献１に記載の中空成形用ブローピン４１には、以下に示す問題点があった。
（１） パリソン内へ噴射される流体の量を大きくするため、ブローニードルの径の大型化が望まれている。しかし、斜面４２の形状では、中空成形用ブローピン４１をパリソンに挿入するときに生じる抵抗が大きく、スムーズに挿入することができない場合がある。したがって、中空成形用ブローピン４１の径を大きくすることができない。 However, the blow pin 41 for hollow molding described in Patent Document 1 has the following problems.
(1) In order to increase the amount of fluid injected into the parison, it is desired to increase the diameter of the blow needle. However, in the case of the shape of the slope 42, the resistance generated when the blow molding blow pin 41 is inserted into the parison is large, so that the insertion may not be performed smoothly. Therefore, the diameter of the blow molding blow pin 41 cannot be increased.

また、特許文献２に記載の針吹きノズル５１は、斜面５３ａ・５３ｂ・５３ｃ・５３ｄのうち隣り合う二つの斜面の間に形成される角部Ｂ１・Ｂ２・Ｂ３・Ｂ４（図８（ｄ）参照）が、それぞれ刃の機能を有している。したがって、特許文献１に記載の中空成形用ブローピン５１と比較して、挿入時の抵抗が小さくなっており、径の大型化が達成されている。しかしながら、以下に示す問題点から、さらに性能のよいブローニードルの開発が望まれている。
（２） 針吹きノズル５１の軸線視断面の形状は、図８（ｄ）に示すように略四角形状であり、隣り合う二つの斜面の間に形成される角部Ｂ１・Ｂ２・Ｂ３・Ｂ４の角度が大きいので刃としての機能が十分でない場合があり、パリソンの一部が垂れたり、パリソンの貫通孔が変形し、大きく拡がったりするおそれがある。 Further, the needle blowing nozzle 51 described in Patent Literature 2 has corners B1, B2, B3, and B4 formed between two adjacent slopes among the slopes 53a, 53b, 53c, and 53d (FIG. 8D). ) Each have a blade function. Therefore, the resistance at the time of insertion is smaller than that of the blow pin 51 for hollow molding described in Patent Literature 1, and a larger diameter is achieved. However, due to the following problems, development of a blow needle having better performance is desired.
(2) As shown in FIG. 8D, the shape of the cross section of the needle blowing nozzle 51 viewed from the axis is a substantially square shape, and the corners B1, B2, B3, and B4 formed between two adjacent slopes. Is too large, the function as a blade may not be sufficient, and a part of the parison may hang down, or the through hole of the parison may be deformed and greatly expanded.

そこで、本発明は、パリソンに挿入するときに生じる抵抗を小さくし、パリソン内部への垂れを抑えることができ、挿入によりパリソンに形成される貫通孔の変形を抑えることができるブローニードルを提供することを課題とする。   Therefore, the present invention provides a blow needle that can reduce the resistance generated when the parison is inserted into the parison, suppress the dripping into the parison, and suppress the deformation of the through hole formed in the parison by the insertion. That is the task.

上述した課題を解決するために、請求項１に記載のブローニードルは、中空成形用金型に保持されたパリソンに当該パリソンの側方から挿入される、軸線方向に長手形状をなす円柱状の本体を有するブローニードルであって、前記本体のパリソン挿入側端部は、軸心に位置する尖端部と、前記尖端部から前記本体の周壁にむかい、テーパ状にひろがり三角錐状をなす三つの斜面部と、を形成してなり、前記三つの斜面部が形成されている部分の軸線視断面形状が鋭角三角形状である構成とした。   In order to solve the above-mentioned problem, the blow needle according to claim 1 has a cylindrical shape having an elongated shape in the axial direction, which is inserted from a side of the parison into a parison held in a mold for hollow molding. A blow needle having a main body, wherein a parison insertion side end of the main body has a sharp end located at an axial center, and three triangular pyramids extending from the sharp end toward the peripheral wall of the main body and extending in a tapered shape. And an inclined surface portion, and the section where the three inclined surface portions are formed has an acute triangular cross-sectional shape as viewed from the axis.

かかる構成により、ブローニードルのパリソン挿入側は、尖端部を頂点のひとつとする三角錐状となる。パリソンに挿入するときには、隣り合う二つの斜面部の間に形成され、鋭角である三つの角部が刃の機能を果たす。したがって、パリソンに挿入するときに生じる抵抗を小さくすることができる。また、抵抗が小さいのでスムーズに挿入することができるので、尖端部付近にパリソンの一部が付着することを防ぐことができ、さらにはパリソンの貫通孔の変形を抑えることができる。   With such a configuration, the parison insertion side of the blow needle has a triangular pyramid shape with one tip as one of the vertices. When inserted into a parison, three sharp corners formed between two adjacent slopes perform the function of a blade. Therefore, the resistance generated when inserting into the parison can be reduced. Also, since the resistance is small, it can be inserted smoothly, so that it is possible to prevent a part of the parison from adhering near the pointed end, and it is possible to suppress the deformation of the through hole of the parison.

また、請求項２に記載のブローニードルは、請求項１に記載のブローニードルであって、前記三つの斜面部のそれぞれは、表面が内側に凹むように形成してなる構成とした。   Further, a blow needle according to a second aspect is the blow needle according to the first aspect, wherein each of the three slope portions is formed so that a surface thereof is depressed inward.

ここでいう「表面が内側に凹む」とは、隣り合う斜面部の間に形成される辺から、斜面部の内側にいくにしたがい斜面部の表面が窪んでいる、という意味である。かかる構成により、斜面部の表面が平面である場合と比較して、隣り合う二つの斜面部の間に形成される角部の角度が小さくなる。したがって、角部の刃としての機能がさらに向上し、請求項１で得られた効果をさらに向上させることができる。また、隣り合う斜面部の間に形成される辺から、所定距離離れた位置から凹みが始まるように形成される構成であってもよい。   Here, “the surface is depressed inward” means that the surface of the slope is depressed toward the inside of the slope from the side formed between the adjacent slopes. With this configuration, the angle of the corner formed between the two adjacent slopes is smaller than when the surface of the slope is flat. Therefore, the function of the corner portion as a blade is further improved, and the effect obtained in claim 1 can be further improved. Further, the configuration may be such that the dent starts from a position separated by a predetermined distance from a side formed between adjacent slope portions.

また、請求項３に記載のブローニードルは、中空成形用金型に保持されたパリソンに突き入れられ、当該パリソンに対する流体の供給または排出に供されるブローニードルであって、筒状の周壁を有する本体と、この本体の先端側に形成され、相対向する一対の鋭角の切裂エッジを有する切裂部と、この切裂部と前記周壁とを結び、相対向する一対の稜線が前記一対の切裂エッジに対して軸方向視での角度位相を略９０度異にする四角錐部とを備えたことを特徴とする。   Further, the blow needle according to claim 3 is a blow needle that is inserted into a parison held by a mold for hollow molding, and is used to supply or discharge a fluid to the parison, wherein the blow needle has a cylindrical peripheral wall. A main body, a cut portion formed on the distal end side of the main body and having a pair of opposed acute-angled cutting edges, and a pair of the ridge lines connecting the cut portion and the peripheral wall, the pair of ridge lines facing each other being the pair of ridges. And a quadrangular pyramid part having an angle phase different from that of the cut edge in the axial direction by approximately 90 degrees.

請求項３の構成により、ブローニードルがパリソンに突き入れられると、切裂部の切裂エッジがパリソンの壁を所定の角度方向に切裂いた後、切裂エッジとその角度位相を異にする四角錐部の一対の稜線が前記角度方向と直交する角度方向に切裂き、ブローニードルの本体が比較的小さな抵抗でパリソンに進入する。   According to the configuration of the third aspect, when the blow needle is inserted into the parison, the cutting edge of the cut portion cuts the wall of the parison in a predetermined angular direction, and then has a different angular phase from the cut edge. A pair of ridge lines of the quadrangular pyramid are torn in an angle direction orthogonal to the angle direction, and the main body of the blow needle enters the parison with relatively small resistance.

本発明のブローニードルによれば、パリソンに挿入するときに生じる抵抗を小さくし、パリソン内部への垂れを抑えることができ、挿入によりパリソンに形成される貫通孔の変形を抑えることができるブローニードルを提供することができる。   ADVANTAGE OF THE INVENTION According to the blow needle of this invention, the blow needle which can reduce the resistance which arises at the time of insertion in a parison, can suppress dripping inside a parison, and can suppress the deformation of the through-hole formed in a parison by insertion. Can be provided.

次に、本発明の実施の形態について適宜図面を参照しながら説明する。
〔第１実施形態〕
図１は、本発明の第１実施形態に係るブローニードルを示す概略図であり、（ａ）は斜視図、（ｂ）は横からみた断面図、（ｃ）は正面図、（ｄ）は軸線視断面図である。ブローニードル１１は、主に尖端部１２、斜面部１３ａ・１３ｂ・１３ｃ、周壁１４、中空部１５および開口部１６から構成されている。 Next, embodiments of the present invention will be described with reference to the drawings as appropriate.
[First Embodiment]
1A and 1B are schematic views showing a blow needle according to a first embodiment of the present invention, wherein FIG. 1A is a perspective view, FIG. 1B is a cross-sectional view as viewed from the side, FIG. 1C is a front view, and FIG. It is axial sectional drawing. The blow needle 11 mainly includes a pointed end portion 12, slope portions 13a, 13b, and 13c, a peripheral wall 14, a hollow portion 15, and an opening portion 16.

尖端部１２は、ブローニードル１１のパリソン挿入側端部であり、円柱状のブローニードル１１の本体の軸心に形成されている。   The pointed end 12 is the end of the blow needle 11 on the parison insertion side, and is formed at the axis of the main body of the cylindrical blow needle 11.

斜面部１３ａ・１３ｂ・１３ｃは、それぞれ尖端部１２から周壁１４までテーパ状にひろがるように形成された斜面から構成される。斜面部１３ａ・１３ｂ・１３ｃは、尖端部１２を頂点のひとつとした略三角錐状のうちの三つ面を形成するよう配置されている。また、斜面部１３ａ・１３ｂ・１３ｃのそれぞれは、略同じ大きさに形成され、軸線視断面が略正三角形状となるように形成されている。さらに、斜面部１３ａ・１３ｂ・１３ｃのそれぞれは、隣り合う二つの斜面部の間に形成される辺から斜面部の内側にいくにしたがいその表面が凹むように形成されている。したがって、斜面部１３ａ・１３ｂ・１３ｃの隣り合う二つの斜面部の間に形成される角部Ａ１・Ａ２・Ａ３の角度は、それぞれ６０度よりも小さい。   Each of the slopes 13a, 13b, and 13c is formed of a slope formed so as to extend in a tapered shape from the pointed end 12 to the peripheral wall 14. The slopes 13a, 13b, and 13c are arranged so as to form three surfaces of a substantially triangular pyramid with the tip 12 as one of the vertices. Further, each of the slope portions 13a, 13b, and 13c is formed to have substantially the same size, and is formed so that the cross-section in the axial direction becomes a substantially equilateral triangular shape. Further, each of the slopes 13a, 13b, 13c is formed so that its surface is concave as it goes from the side formed between two adjacent slopes to the inside of the slope. Therefore, the angles of the corners A1, A2, and A3 formed between two adjacent slopes of the slopes 13a, 13b, and 13c are each smaller than 60 degrees.

周壁１４は、軸線方向にのびる円柱状の本体の表面部分であり、その内部には、軸線方向にのびる中空部１５が形成されている。また、周壁１４の斜面部１３ａ・１３ｂ・１３ｃ近傍には、中空部１５のパリソンＰ（図２参照）側の出入口となる複数の開口部１６が形成されている。   The peripheral wall 14 is a surface portion of a cylindrical main body extending in the axial direction, and a hollow portion 15 extending in the axial direction is formed therein. In the vicinity of the slopes 13a, 13b and 13c of the peripheral wall 14, there are formed a plurality of openings 16 serving as entrances and exits of the hollow portion 15 on the parison P (see FIG. 2) side.

中空部１５は、ブローニードル１１の本体内部に軸線方向にのびるように形成されている。流体は、中空部１５内を通り、複数の開口部１６からパリソンＰ内に流出される。また、パリソンＰ内の流体を排出するときには、パリソンＰ内の流体は、開口部１６から中空部１５に流入される。   The hollow portion 15 is formed to extend in the axial direction inside the main body of the blow needle 11. The fluid passes through the hollow portion 15 and flows out of the plurality of openings 16 into the parison P. When discharging the fluid in the parison P, the fluid in the parison P flows into the hollow portion 15 from the opening 16.

開口部１６は、中空部１５のパリソンＰ側出入口であり、周壁１４の斜面部１３ａ・１３ｂ・１３ｃ近傍に等間隔に配置するよう、複数形成される。これは、流体をパリソンＰ内に均等に噴射するためである。また、開口部１６は、周壁１４に形成されているので、ブローニードル１１をパリソンＰに挿入するときに、パリソンＰの一部が開口部１６に詰まることがない。   The openings 16 are entrances and exits of the hollow portion 15 on the parison P side, and a plurality of the openings 16 are formed near the slopes 13a, 13b, and 13c of the peripheral wall 14 so as to be arranged at equal intervals. This is to inject the fluid evenly into the parison P. Further, since the opening 16 is formed in the peripheral wall 14, when the blow needle 11 is inserted into the parison P, a part of the parison P does not clog the opening 16.

なお、ここでいう流体とは、パリソンＰを膨張させるために噴射される空気や、パリソンＰを冷却するために噴射される冷却ガス（冷却された空気、ＣＯ2、Ｎ2、ＮＯ2等）や冷却水のことを指す。 The fluid referred to here is air injected to expand the parison P or a cooling gas (cooled air, CO 2 , N 2 , NO 2, etc.) injected to cool the parison P. And cooling water.

また、ブローニードル１１のパリソン挿入側と逆側の端部は、中空部１５を通じて、流体としての高圧エアーを送り込む高圧エアー源や、パリソンＰ内の流体を吸引する吸引機等を接続可能な構成となっている。   Further, the end of the blow needle 11 opposite to the parison insertion side can be connected to a high-pressure air source for feeding high-pressure air as a fluid, a suction device for sucking the fluid in the parison P, and the like through the hollow portion 15. It has become.

図１（ｄ）に示すように、ブローニードル１１の斜面部１３ａ・１３ｂ・１３ｃ部分の軸線視断面形状は、各辺が内側に凹む略正三角形状である。斜面部１３ａ・１３ｂ・１３ｃのうち隣り合う二つの斜面部の間に形成される三つの角部Ａ１・Ａ２・Ａ３は鋭角（６０度より小さい）であり、パリソンＰに挿入される際には、これら三つの角部Ａ１・Ａ２・Ａ３は刃の機能を果たす。そのため、軸線視断面形状が蒲鉾形状となる中空成形用ブローピン４１（図７（ｄ）参照）や、軸線視断面形状が略四角形状となり、角部Ｂ１・Ｂ２・Ｂ３・Ｂ４の角度が、角部Ａ１・Ａ２・Ａ３の角度と比較して大きい針吹きノズル５１（図８（ｄ）参照）と比較しても、角部Ａ１・Ａ２・Ａ３が有する刃の機能により、挿入時の抵抗が小さくなり、ブローニードル１１をパリソンＰにスムーズに挿入することができる。また、パリソンＰが尖端部１２付近に付着しにくく、尖端部１２付近に付着したパリソンＰの破片がパリソンＰ内面に垂れるのを防ぐことができる。さらには、パリソンＰに形成される貫通孔の形状が変形し、大きくなることを防ぐことができる。また、中空成形用ブローピン４１や、針吹きノズル５１と比較して、さらなる径の大型化が可能である。   As shown in FIG. 1D, the cross-sectional shape of the inclined surfaces 13 a, 13 b, and 13 c of the blow needle 11 as viewed in the axial direction is a substantially equilateral triangle with each side recessed inward. Three corners A1, A2, and A3 formed between two adjacent slopes among the slopes 13a, 13b, and 13c are acute angles (smaller than 60 degrees), and when inserted into the parison P, The three corners A1, A2, A3 function as blades. For this reason, the blow molding blow pin 41 (see FIG. 7 (d)) whose cross-sectional shape as viewed in the axial direction is a semi-cylindrical shape, or a substantially rectangular cross-sectional shape as viewed in the axial direction, and the angles of the corners B1, B2, B3, and B4 are Even when compared with the needle blowing nozzle 51 (see FIG. 8D) which is larger than the angles of the portions A1, A2, and A3, the resistance at the time of insertion is reduced due to the function of the blades of the corners A1, A2, and A3. As a result, the blow needle 11 can be smoothly inserted into the parison P. Further, the parison P is unlikely to adhere to the vicinity of the point 12, and pieces of the parison P adhered to the vicinity of the point 12 can be prevented from hanging on the inner surface of the parison P. Further, the shape of the through hole formed in the parison P can be prevented from being deformed and increased. Further, the diameter can be further increased as compared with the blow pin 41 for hollow molding and the needle blowing nozzle 51.

図２は、本発明の第１実施形態に係るブローニードルを用いた中空成形装置の一例を示す概略部分断面図である。中空成形装置２１は、主に押出機２２、中空成形用金型２３・２４（以下、金型２３・２４と記載する。）、およびブローニードル２５・２６から構成される。ここで、ブローニードル２５・２６は、図１で示したブローニードル１１と同様の構成を有する。   FIG. 2 is a schematic partial cross-sectional view showing one example of a blow molding apparatus using a blow needle according to the first embodiment of the present invention. The hollow molding device 21 mainly includes an extruder 22, hollow molds 23 and 24 (hereinafter, referred to as molds 23 and 24), and blow needles 25 and 26. Here, the blow needles 25 and 26 have the same configuration as the blow needle 11 shown in FIG.

押出機２２は、加熱され軟らかくなったパリソンＰをチューブ状にして、金型２３・２４方向へ押し出す機器である。   The extruder 22 is an apparatus that extrudes the heated and softened parison P in the form of a tube and in the direction of the dies 23 and 24.

金型２３・２４は、その内側となる面に、パリソンＰを成形品の形状に成形するための成形面を有し、押し出されたパリソンＰをくわえ込むようにして閉じられる。   The molds 23 and 24 have a molding surface for molding the parison P into a shape of a molded product on the inner surface thereof, and are closed so as to hold the extruded parison P.

ブローニードル２５・２６は、一方の金型２４に形成されたブローニードル挿入部２４ａ・２４ｂから、パリソンＰの内面にそれぞれ挿入される。ブローニードル２５は、その中空部１５から開口部１６を経て、パリソンＰ内に向かって流体を噴射するように構成されている。また、ブローニードル２６は、その開口部１６から中空部１５を経て、パリソンＰ内の流体を外部に排出するように構成されている。ブローニードル２５に流体としての高圧エアーを送り込む高圧エアー源や、ブローニードル２６からパリソンＰ内の流体を吸引する吸引機は、公知のものを用いる。
〔第２実施形態〕
次に、本発明の第２実施形態を説明する。第２実施形態の説明にあたっては、前記の第１実施形態と同一の部材には同一の符号を付す。 The blow needles 25 and 26 are inserted into the inner surfaces of the parison P from the blow needle insertion portions 24a and 24b formed in one mold 24, respectively. The blow needle 25 is configured to inject a fluid from the hollow portion 15 through the opening portion 16 into the parison P. The blow needle 26 is configured to discharge the fluid in the parison P to the outside from the opening 16 through the hollow portion 15. As a high-pressure air source for feeding high-pressure air as a fluid to the blow needle 25 and a suction device for sucking the fluid in the parison P from the blow needle 26, known ones are used.
[Second embodiment]
Next, a second embodiment of the present invention will be described. In the description of the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals.

図３は、本発明の第２実施形態に係るブローニードルを示す概略図であり、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は横からみた断面図、（ｄ）は正面図である。図３（ａ）,（ｂ）に示すように、本実施形態のブローニードル１１は、円筒状の周壁１４を有する本体１７と、この本体１７の先端に形成された切裂部１８と、この切裂部１８と周壁１４とを結ぶ四角錐部１９とから構成されている。   3A and 3B are schematic diagrams showing a blow needle according to a second embodiment of the present invention, wherein FIG. 3A is a perspective view, FIG. 3B is a side view, FIG. 3C is a cross-sectional view as viewed from the side, and FIG. It is a front view. As shown in FIGS. 3A and 3B, the blow needle 11 of the present embodiment includes a main body 17 having a cylindrical peripheral wall 14, a cut portion 18 formed at the tip of the main body 17, It is composed of a quadrangular pyramid 19 connecting the cut 18 and the peripheral wall 14.

また、図３（ｃ）に示すように、本体１７の内部には、軸線方向にのびる中空部１５が形成される一方、周壁１４には、中空部１５に連通する複数の開口部１６が形成されている。   As shown in FIG. 3C, a hollow portion 15 extending in the axial direction is formed inside the main body 17, while a plurality of openings 16 communicating with the hollow portion 15 are formed in the peripheral wall 14. Have been.

図３（ａ）,（ｂ）,（ｄ）に示すように、切裂部１８は、比較的扁平なダガー（短剣）形状を呈し、周壁１４に連続する一対の鋭角（本実施形態では、約２５度）の切裂エッジ２０，２０を有している。また、四角錐部１９は、その相対向する一対の稜線３１，３１が切裂エッジ２０，２０と軸方向視で９０度の角度位相をなし、切裂エッジ２０，２０を先端側から後端側にかけて一定幅とさせるかたちに形成されている。尚、四角錐部１９の他の一対の稜線３２，３２は、図３（ａ）中に二点鎖線で示すように、切裂部１８内に位置する。前記したように、切裂部１８は扁平なダガー形状であり、図３（ｂ）から判るように、本体１７の軸方向に対するそのテーパ角度は、稜線３１側のテーパ角度よりも小さく形成されている。   As shown in FIGS. 3A, 3B, and 3D, the cut portion 18 has a relatively flat dagger (dagger) shape, and has a pair of acute angles (in this embodiment, continuous with the peripheral wall 14). (About 25 degrees). In the quadrangular pyramid portion 19, the pair of ridge lines 31, 31 opposed to each other form a 90 ° angular phase with the cutting edges 20, 20 when viewed in the axial direction. It is formed to have a constant width toward the side. The other pair of ridge lines 32, 32 of the quadrangular pyramid portion 19 are located in the cut portion 18 as shown by a two-dot chain line in FIG. As described above, the cut portion 18 has a flat dagger shape, and as can be seen from FIG. 3B, the taper angle of the main body 17 with respect to the axial direction is formed smaller than the taper angle of the ridgeline 31 side. I have.

以下、第２実施形態の作用を述べる。
第２実施形態では、ブローニードル１１がパリソンＰに突き入れられると、先ず、図４（ａ）に示すように、ブローニードル１１の切裂部１８は、その切裂エッジ２０，２０でパリソンＰを一文字（図４（ａ）では横一文字）に切裂きながらパリソンＰ内に進入する。そして、ブローニードル１１がパリソンＰに更に突き入れられると、図４（ｂ）に示すように、ブローニードル１１の四角錐部１９は、その稜線３１，３１でパリソンＰを一文字（図４（ｂ）では縦一文字）に切裂きながら進入する。 Hereinafter, the operation of the second embodiment will be described.
In the second embodiment, when the blow needle 11 is inserted into the parison P, first, as shown in FIG. 4A, the cut portion 18 of the blow needle 11 is moved by the cut edges 20, 20 of the parison P. Enters the parison P while being cut into one character (one horizontal character in FIG. 4A). Then, when the blow needle 11 is further pushed into the parison P, as shown in FIG. 4B, the square pyramid portion 19 of the blow needle 11 forms one character of the parison P at its ridge lines 31, 31 (FIG. In), one character is cut vertically.

これにより、パリソンＰが十文字に切裂かれることとなるため、図４（ｃ）に示すようにブローニードル１１の本体１７が突き入れられる際の抵抗は非常に小さいものとなり、したがって、その分、ブローニードル１１の大径化等を図ることが容易となる。また、パリソンＰがブローニードル１１の周壁１４に連続する鋭い切裂エッジ２０，２０により大きく切裂かれるため、ブローニードル１１の先端にパリソンＰの一部が付着し、これがパリソンＰの内部に垂れ落ちて成形後の製品（本実施形態では燃料タンク）内に異物として残ってしまうことが防止される。   As a result, the parison P is cut into crosses, so that the resistance when the main body 17 of the blow needle 11 is inserted as shown in FIG. 4C is very small. It is easy to increase the diameter of the blow needle 11 and the like. Further, since the parison P is severely cut by the sharp cutting edges 20 and 20 which are continuous with the peripheral wall 14 of the blow needle 11, a part of the parison P adheres to the tip of the blow needle 11 and hangs inside the parison P. This prevents falling and remaining as foreign matter in the molded product (the fuel tank in the present embodiment).

なお、本発明は、上述した実施形態に限定されず、本発明の要旨を逸脱しない範囲で適宜設定変更可能である。例えば、中空部１５および開口部１６の位置・形状は、特許文献２に記載の針吹きノズル５１のように、複数の中空部を有し、流体の噴射および排出を一本のブローニードルで行うことができる構成であってもよい。また、ブローニードル２５・２６を用いた中空成形装置２１のレイアウト等もこれに限定されない。また、第１実施形態において、尖端部１２部分に形成される角度、斜面部１３ａ・１３ｂ・１３ｃの軸線方向の長さ、開口部１６の位置等は、パリソンＰを中空成形可能な範囲で変更可能である。また、一般に、ブローニードル１１の尖端部１２および三つの斜面部１３ａ・１３ｂ・１３ｃは、円柱体を切削加工することにより形成される。したがって、ブローニードル１１自体の製造容易性を優先する場合には、三つの斜面部１３ａ・１３ｂ・１３ｃの表面が内側に凹むように形成せず、平面となる構成であってもよい（図５（ａ）参照）。また、隣り合う斜面部の間に形成される辺から所定距離離れた位置から凹むように形成されている構成であってもよい（図５（ｂ）参照）。また、三つの斜面部１３ａ・１３ｂ・１３ｃのうち少なくともひとつの斜面部の表面が内側に凹むように形成されている構成であってもよい。また、ブローニードル１１の三つの斜面部１３ａ・１３ｂ・１３ｃが形成された部分の軸線視断面形状は、略正三角形状に限定されず、その他略鋭角三角形状、略直角三角形状または略鈍角三角形状であってもよい。また、第２実施形態において、切裂エッジは９０度以下の任意の角度に設定可能であるし、その形状も前記実施形態での例示に限るものではない。例えば、図６（ａ），（ｂ）に示した例では、切裂エッジ２０，２０の幅が先端側から後端側に向けて狭くするように四角錐部１９が形成されている。   Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed and set without departing from the gist of the present invention. For example, the positions and shapes of the hollow portion 15 and the opening portion 16 include a plurality of hollow portions as in a needle blowing nozzle 51 described in Patent Literature 2, and a single blow needle performs ejection and discharge of a fluid. It may be a configuration that can be used. Further, the layout and the like of the hollow molding device 21 using the blow needles 25 and 26 are not limited thereto. In the first embodiment, the angle formed at the point 12, the axial length of the slopes 13 a, 13 b, and 13 c, the position of the opening 16, and the like are changed within a range in which the parison P can be hollow-molded. It is possible. Generally, the pointed end 12 of the blow needle 11 and the three slopes 13a, 13b, 13c are formed by cutting a cylindrical body. Therefore, when the ease of manufacture of the blow needle 11 itself is prioritized, the surface of the three sloped portions 13a, 13b, and 13c may not be formed so as to be depressed inward, and may be a flat surface (FIG. 5). (A)). Further, the configuration may be such that it is formed so as to be recessed from a position separated by a predetermined distance from a side formed between adjacent slope portions (see FIG. 5B). Further, the configuration may be such that the surface of at least one of the three slopes 13a, 13b, and 13c is formed to be depressed inward. The sectional shape of the blow needle 11 where the three inclined surfaces 13a, 13b, and 13c are formed is not limited to a substantially equilateral triangle, but may be any other approximately acute triangle, approximately right triangle, or approximately obtuse triangle. It may be shaped. Further, in the second embodiment, the cut edge can be set at an arbitrary angle of 90 degrees or less, and the shape is not limited to the example in the above embodiment. For example, in the example shown in FIGS. 6A and 6B, the quadrangular pyramid portion 19 is formed so that the width of the cut edges 20, 20 becomes narrower from the front end side to the rear end side.

本発明の第１実施形態に係るブローニードルを示す概略図であり、（ａ）は斜視図、（ｂ）は横からみた断面図、（ｃ）は正面図、（ｄ）は軸線視断面図である。It is the schematic which shows the blow needle which concerns on 1st Embodiment of this invention, (a) is a perspective view, (b) is sectional drawing seen from the side, (c) is a front view, (d) is axial sectional drawing. It is. 本発明の第１実施形態に係るブローニードルを用いた中空成形装置を示す概略部分断面図である。1 is a schematic partial cross-sectional view illustrating a blow molding device using a blow needle according to a first embodiment of the present invention. 本発明の第２実施形態に係るブローニードルを示す概略図であり、（ａ）は斜視図、（ｂ）は側面図、（ｃ）は横からみた断面図、（ｄ）は正面図である。It is the schematic which shows the blow needle which concerns on 2nd Embodiment of this invention, (a) is a perspective view, (b) is a side view, (c) is sectional drawing seen from the side, (d) is a front view. . 本発明の第２実施形態の作用を示す斜視図であり、（ａ）はブローニードルの切裂部がパリソンを切裂く状態を示し、（ｂ）はブローニードルの四角錐部がパリソンを切裂く状態を示し、（ｃ）はブローニードルの本体が突き入れられる状態を示している。It is a perspective view which shows the effect | action of 2nd Embodiment of this invention, (a) shows the state where the cut part of a blow needle cuts a parison, (b) is the square pyramid part of a blow needle cuts a parison. (C) shows a state in which the main body of the blow needle is inserted. 本発明の第１実施形態に係るブローニードルの変形例を示す軸線視断面図である。It is an axial sectional view showing a modification of a blow needle concerning a 1st embodiment of the present invention. 本発明の第２実施形態に係るブローニードルの変形例を示す概略図であり、（ａ）は側面図、（ｂ）は正面図である。It is the schematic which shows the modification of the blow needle which concerns on 2nd Embodiment of this invention, (a) is a side view, (b) is a front view. 特許文献１に記載の中空成形用ブローニードルを示す概略図であり、（ａ）は斜視図、（ｂ）は横からみた断面図、（ｃ）は正面図、（ｄ）は軸線視断面図である。It is the schematic which shows the blow needle for hollow molding of patent document 1, (a) is a perspective view, (b) is sectional drawing seen from the side, (c) is front view, (d) is axial sectional drawing. It is. 特許文献２に記載の針吹きノズルを示す概略図であり、（ａ）は斜視図、（ｂ）は横からみた断面図、（ｃ）は正面図、（ｄ）は軸線視断面図である。It is the schematic which shows the needle blowing nozzle of patent document 2, (a) is a perspective view, (b) is sectional drawing seen from the side, (c) is a front view, (d) is an axial sectional drawing. .

符号の説明Explanation of reference numerals

１１、２５、２６ ブローニードル
１２ 尖端部
１３ａ、１３ｂ、１３ｃ 斜面部
１４ 周壁
１５ 中空部
１６ 開口部
１８ 本体
１９ 四角錐部
２０ 切裂エッジ
２１ 中空成形装置
２２ 押出機
２３、２４ 中空成形用金型
３１，３２ 稜線
Ｐ パリソン
Ａ１・Ａ２・Ａ３ 角部 11, 25, 26 Blow needle 12 Pointed end 13a, 13b, 13c Bevel 14 Peripheral wall 15 Hollow 16 Opening 18 Main body 19 Square pyramid 20 Cutting edge 21 Hollow molding device 22 Extruder 23, 24 Die for hollow molding 31, 32 Ridge P Parison A1, A2, A3 Corner

Claims (3)

中空成形用金型に保持されたパリソンに当該パリソンの側方から挿入される、軸線方向に長手形状をなす円柱状の本体を有するブローニードルであって、
前記本体のパリソン挿入側端部は、軸心に位置する尖端部と、前記尖端部から前記本体の周壁にむかい、テーパ状にひろがり三角錐状をなす三つの斜面部と、を形成してなり、前記三つの斜面部が形成されている部分の軸線視断面形状が鋭角三角形状であることを特徴とするブローニードル。 A blow needle having a cylindrical main body that is elongated in the axial direction, inserted into the parison held by the hollow molding die from the side of the parison,
The parison insertion-side end of the main body is formed with a sharp end located at the axis, and three slopes extending from the sharp end to the peripheral wall of the main body and extending in a tapered shape to form a triangular pyramid. A blow needle characterized in that the section where the three slopes are formed has an acute triangular cross-sectional shape as viewed from the axis. 前記三つの斜面部のそれぞれは、表面が内側に凹むように形成してなることを特徴とする請求項１に記載のブローニードル。   2. The blow needle according to claim 1, wherein each of the three slope portions is formed so that a surface thereof is depressed inward. 3. 中空成形用金型に保持されたパリソンに突き入れられ、当該パリソンに対する流体の供給または排出に供されるブローニードルであって、
筒状の周壁を有する本体と、
この本体の先端側に形成され、相対向する一対の鋭角の切裂エッジを有する切裂部と、
この切裂部と前記周壁とを結び、相対向する一対の稜線が前記一対の切裂エッジに対して軸方向視での角度位相を略９０度異にする四角錐部と
を備えたことを特徴とするブローニードル。 A blow needle which is inserted into a parison held by a mold for hollow molding and is supplied or supplied with a fluid to the parison,
A main body having a cylindrical peripheral wall,
A cut portion formed on the distal end side of the main body and having a pair of opposed acute cut edges,
A quadrangular pyramid portion connecting the cut portion and the peripheral wall, wherein a pair of ridge lines facing each other has a quadrangular pyramid portion having an angular phase different from that of the pair of cut edges by approximately 90 degrees in an axial direction view. A characteristic blow needle.
JP2003275771A 2003-03-12 2003-07-17 Blow needle Expired - Lifetime JP4214018B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009190207A (en) * 2008-02-13 2009-08-27 Aitec:Kk Method for producing hollow molding and mold
JP2010195020A (en) * 2009-02-27 2010-09-09 Honda Motor Co Ltd Needle pin for blow molding
JP2013014281A (en) * 2011-07-06 2013-01-24 Denso Corp Vehicle collision detection device
JP2018144403A (en) * 2017-03-08 2018-09-20 株式会社Fts Method for blow molding and blow pin
CN109049640A (en) * 2018-07-20 2018-12-21 宁波方正汽车模具股份有限公司 Blow needle mechanism for blow molding die list gas hole
US20210354176A1 (en) * 2020-05-18 2021-11-18 Ian R. Vinci Tip for scraping with focused high velocity air

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009190207A (en) * 2008-02-13 2009-08-27 Aitec:Kk Method for producing hollow molding and mold
JP2010195020A (en) * 2009-02-27 2010-09-09 Honda Motor Co Ltd Needle pin for blow molding
JP2013014281A (en) * 2011-07-06 2013-01-24 Denso Corp Vehicle collision detection device
JP2018144403A (en) * 2017-03-08 2018-09-20 株式会社Fts Method for blow molding and blow pin
CN109049640A (en) * 2018-07-20 2018-12-21 宁波方正汽车模具股份有限公司 Blow needle mechanism for blow molding die list gas hole
CN109049640B (en) * 2018-07-20 2020-08-11 宁波方正汽车模具股份有限公司 Blowing needle mechanism for single blowing hole of blow mould
US20210354176A1 (en) * 2020-05-18 2021-11-18 Ian R. Vinci Tip for scraping with focused high velocity air

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