JP2003211521A - Mold for extrusion molding of hollow pipe - Google Patents
Mold for extrusion molding of hollow pipeInfo
- Publication number
- JP2003211521A JP2003211521A JP2002008132A JP2002008132A JP2003211521A JP 2003211521 A JP2003211521 A JP 2003211521A JP 2002008132 A JP2002008132 A JP 2002008132A JP 2002008132 A JP2002008132 A JP 2002008132A JP 2003211521 A JP2003211521 A JP 2003211521A
- Authority
- JP
- Japan
- Prior art keywords
- mandrel
- flow rate
- adjusting member
- rate adjusting
- peripheral surface
- 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
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ゴムホースや合
成樹脂製チューブ等の中空管を押出成形するための金型
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for extruding a hollow tube such as a rubber hose or a synthetic resin tube.
【０００２】[0002]
【従来の技術】中空管の押出成形に用いられる金型は、
一般に、円筒状の内周面を有する口金と、その内周側に
同心状に配置されるマンドレルと、から構成されてお
り、このマンドレルの外周面と上記口金との間に構成さ
れる円筒状の材料流路を通して、ゴム等の可塑材料を連
続的に押出成形するようになっている。2. Description of the Related Art Molds used for extrusion molding hollow tubes are
Generally, it is composed of a mouthpiece having a cylindrical inner peripheral surface and a mandrel arranged concentrically on the inner peripheral side thereof, and a cylindrical shape formed between the outer peripheral surface of the mandrel and the mouthpiece. A plastic material such as rubber is continuously extruded through the material flow path.
【０００３】このような中空管の押出成形に際しては、
主に、金型の周方向での温度の不均一や、金型上流側で
の材料の供給方向、などに起因して、成形された中空管
に偏肉が生じやすい。つまり、口金とマンドレルとの間
の円筒状の材料流路を、周方向の各部で均一な隙間に精
度良く形成したとしても、中空管の肉厚が周方向の一部
で厚く、かつ周方向の一部で薄くなりやすい。In the extrusion molding of such a hollow tube,
Mainly due to uneven temperature in the circumferential direction of the mold, the material supply direction on the upstream side of the mold, and the like, uneven thickness is likely to occur in the molded hollow tube. In other words, even if the cylindrical material flow path between the die and the mandrel is accurately formed in a uniform gap in each portion in the circumferential direction, the wall thickness of the hollow tube is thick in a part in the circumferential direction, and It tends to become thin in a part of the direction.
【０００４】この偏肉の問題に対処するために、従来、
例えば特開平５−１３８７１５号公報に記載されている
ように、口金の先端部の位置を、周方向に多数配置した
調整用ボルトでもって半径方向に変位させ、成形された
中空管の肉厚が周方向で均一なものとなるように調整可
能とした中空管押出成形用金型が知られている。In order to deal with the problem of uneven thickness, the
For example, as described in JP-A-5-138715, the position of the tip of the die is displaced in the radial direction by a large number of adjusting bolts arranged in the circumferential direction, and the wall thickness of the hollow tube formed is formed. There is known a hollow tube extrusion molding die that can be adjusted so as to be uniform in the circumferential direction.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら上記従来
の金型においては、周方向に一定角度毎に配置された多
数の調整用ボルトを有する複雑な構成となるばかりか、
多数の調整用ボルトによる調整作業が非常に面倒なもの
となる。特に、温度分布の変化等に対し肉厚の偏りの方
向を再調整する場合に、一般に全ての調整用ボルトを再
度調整し直す必要があり、手間が掛かる、という問題が
ある。However, the above-mentioned conventional mold not only has a complicated structure having a large number of adjusting bolts arranged at a constant angle in the circumferential direction,
Adjustment work using a large number of adjustment bolts becomes very troublesome. In particular, when readjusting the direction of the deviation of the wall thickness due to changes in temperature distribution and the like, it is generally necessary to readjust all the adjusting bolts again, which is troublesome.
【０００６】また、上記従来の構成では、可塑材料が吐
出される環状の吐出口つまり円筒状の材料流路の先端開
口部の半径方向寸法を調整するようになっており、偏肉
を補正すべく調整した状態では、結果的に、環状吐出口
の半径方向寸法が周方向に不均一なものとなっているの
で、周方向各部での材料流出速度が不均一となり、その
結果、押出成形された中空管が一方へ曲がってしまうこ
とがある、という問題もある。Further, in the above-mentioned conventional structure, the radial dimension of the annular discharge port for discharging the plastic material, that is, the front end opening of the cylindrical material flow path is adjusted to correct the uneven thickness. In the state adjusted accordingly, as a result, the radial dimension of the annular discharge port becomes non-uniform in the circumferential direction, so the material outflow rate at each part in the circumferential direction becomes non-uniform, resulting in extrusion molding. There is also a problem that the hollow tube may bend to one side.
【０００７】[0007]
【課題を解決するための手段】本発明では、請求項１の
ように、円筒状の内周面を有する口金と、この口金の内
周側に同心状に配置されるとともに円筒状の外周面を有
するマンドレルと、を備え、両者間に形成された円筒状
の材料流路から材料が押し出される中空管押出成形用金
型において、上記口金の上流側に、上記マンドレルを囲
む円環状をなす流量調整部材が回転可能に配置されてお
り、この流量調整部材の内周面と上記マンドレルとの間
に形成される流路が、周方向で不均一な通路断面積を有
している。According to the present invention, as in claim 1, a die having a cylindrical inner peripheral surface, and a cylindrical outer peripheral surface arranged concentrically on the inner peripheral side of the die. A mandrel having, and a hollow-tube extrusion molding die in which a material is extruded from a cylindrical material flow path formed between the two, in an upstream side of the die, a circular ring surrounding the mandrel is formed. The flow rate adjusting member is rotatably arranged, and the flow passage formed between the inner peripheral surface of the flow rate adjusting member and the mandrel has a passage cross-sectional area that is non-uniform in the circumferential direction.
【０００８】このようにマンドレルとの間で周方向に不
均一な通路断面積を形成するために、上記流量調整部材
は、例えば請求項２のように、上記マンドレル外周面に
対し偏心した円筒状の内周面を有する。この場合、流量
調整部材に形成される円筒状内周面の径は、一般に、上
記口金の円筒状内周面の径と等しく設定される。あるい
は、僅かに異なっていても良い。In order to form a non-uniform passage cross-sectional area in the circumferential direction between the mandrel and the mandrel, the flow rate adjusting member has a cylindrical shape eccentric with respect to the outer peripheral surface of the mandrel. Has an inner peripheral surface. In this case, the diameter of the cylindrical inner peripheral surface formed on the flow rate adjusting member is generally set to be equal to the diameter of the cylindrical inner peripheral surface of the die. Alternatively, it may be slightly different.
【０００９】従って、流量調整部材とマンドレルとの間
の通路断面積が狭い方向では、材料の流量が少なく制限
され、また通路断面積が広い方向では、材料の流量が相
対的に多くなる。そのため、偏肉が生じる方向に合わせ
て、上記流量調整部材の回転位置を適宜に設定すること
で、成形された中空管の偏肉を非常に小さくすることが
できる。Therefore, the flow rate of the material is limited to a small amount in the direction where the passage cross-sectional area between the flow rate adjusting member and the mandrel is narrow, and the flow rate of the material becomes relatively large in the direction where the passage cross-sectional area is wide. Therefore, by appropriately setting the rotational position of the flow rate adjusting member according to the direction in which the uneven thickness occurs, the uneven thickness of the molded hollow tube can be made extremely small.
【００１０】また、上記流量調整部材は、口金の上流側
に位置しており、この流量調整部材によって周方向の流
量分布が調整された材料の流れは、口金とマンドレルと
の間の円筒状の材料流路を流れる間に整流され、周方向
の各部で均一に吐出されるので、曲がりを生じることが
ない。The flow rate adjusting member is located on the upstream side of the die, and the flow of the material, the flow rate distribution of which is adjusted in the circumferential direction by the flow rate adjusting member, is a cylindrical shape between the die and the mandrel. It is rectified while flowing through the material flow path and is uniformly discharged at each portion in the circumferential direction, so that no bending occurs.
【００１１】さらに請求項３の発明では、上記流量調整
部材は、上記マンドレルの基部側を囲む金型基体と上記
口金との間に挟持されており、上記金型基体から上記口
金に亘って形成された周方向に均一な円筒状の材料流路
の軸方向の中間位置に該流量調整部材が位置している。
これにより、金型基体側から口金の吐出口へ向かって一
定の断面形状の材料流路を流れようとする可塑材料の周
方向の流量分布が、途中で流量調整部材により調整され
ることになり、偏肉を防止しつつ、より安定した形で材
料が吐出される。Further, in the invention of claim 3, the flow rate adjusting member is sandwiched between a die base surrounding the base side of the mandrel and the die, and is formed from the die base to the die. The flow rate adjusting member is located at an axially intermediate position of the cylindrical material flow path that is uniform in the circumferential direction.
As a result, the flow rate distribution in the circumferential direction of the plastic material that attempts to flow through the material flow passage having a constant cross-section from the die base side to the die outlet is adjusted by the flow rate adjusting member on the way. The material is discharged in a more stable form while preventing uneven thickness.
【００１２】[0012]
【発明の実施の形態】以下、ゴムホースの押出成形に適
用したこの発明の一実施例を図面に基づいて詳細に説明
する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention applied to extrusion molding of a rubber hose will be described below in detail with reference to the drawings.
【００１３】図１は、この発明に係る押出成形用金型を
示す縦断面図であって、図示せぬ押出成形機の先端部に
取り付けられる金型基体１は、略円筒状をなし、中心部
に、軸方向に沿った材料供給孔２が形成されているとと
もに、この材料供給孔２と直列に並ぶように、先端側の
中心部に、マンドレル３が配置されている。このマンド
レル３は、上流端に、下流に向かって徐々に径が拡大し
た円錐形部３ａを有するとともに、この円錐形部３ａか
ら徐々に径が縮小する縮径部３ｂを有し、かつこの縮径
部３ｂの端部に、径が一定となった円柱部３ｃが接続さ
れている。このマンドレル３が配置された金型基体１の
内周面は、該マンドレル３の外形状に対応した形状に形
成されており、該マンドレル３と金型基体１内周面との
間には、一定の隙間からなる材料流路４が確保されてい
る。この材料流路４は、上流側で上記材料供給孔２に連
続している。なお、上記マンドレル３は、上記円錐形部
３ａと上記縮径部３ｂとの間の大径部３ｄにおいて、放
射状に延びた複数のスパイダー部５によって上記金型基
体１に支持されている。FIG. 1 is a vertical cross-sectional view showing an extrusion molding die according to the present invention. A die substrate 1 attached to the tip of an extrusion molding machine (not shown) has a substantially cylindrical shape and has a center. A material supply hole 2 along the axial direction is formed in the portion, and a mandrel 3 is arranged in the central portion on the tip side so as to be lined up in series with the material supply hole 2. The mandrel 3 has, at its upstream end, a conical portion 3a whose diameter gradually increases toward the downstream side, and a reduced diameter portion 3b whose diameter gradually decreases from the conical portion 3a, and A cylindrical portion 3c having a constant diameter is connected to the end of the diameter portion 3b. The inner peripheral surface of the mold base 1 on which the mandrel 3 is arranged is formed in a shape corresponding to the outer shape of the mandrel 3, and between the mandrel 3 and the inner peripheral surface of the mold base 1, A material flow path 4 having a constant gap is secured. The material flow path 4 is continuous with the material supply hole 2 on the upstream side. The mandrel 3 is supported on the mold base 1 by a plurality of radially extending spider portions 5 at a large diameter portion 3d between the conical portion 3a and the reduced diameter portion 3b.
【００１４】上記マンドレル３の円柱部３ｃは、その軸
方向の一部が金型基体１内部に位置し、かつ大部分が金
型基体１から前方へ突出している。そして、この突出し
た円柱部３ｃの外周を囲むように円筒状の口金１１が配
置されており、この口金１１と上記金型基体１との間
に、円環状をなす流量調整部材１２が挟持されている。A part of the cylindrical portion 3c of the mandrel 3 in the axial direction is located inside the mold base 1, and most of it projects forward from the mold base 1. A cylindrical mouthpiece 11 is arranged so as to surround the outer periphery of the protruding columnar portion 3c, and an annular flow rate adjusting member 12 is sandwiched between the mouthpiece 11 and the mold base 1. ing.
【００１５】上記口金１１は、マンドレル３と平行に延
びる円筒部１１ａと、該円筒部１１ａの上流端に設けら
れた円環状のフランジ部１１ｂと、からなり、その内周
面１１ｃが、上記マンドレル３と同心な一定径の円筒面
をなしていて、上記マンドレル３の円柱部３ｃの外周面
３ｅとの間に、一定の隙間からなる材料流路１３が形成
されている。ここで、この口金１１内周における材料流
路１３は、マンドレル３の円柱部３ｃと金型基体１との
間に形成された円筒状の材料流路４ａと全く同一の通路
断面形状に設定されている。また口金１１先端とマンド
レル３先端とは軸方向に等しい位置にあり、両者間で、
上記材料流路１３が吐出口１３ａとして開口している。The base 11 comprises a cylindrical portion 11a extending parallel to the mandrel 3 and an annular flange portion 11b provided at the upstream end of the cylindrical portion 11a, the inner peripheral surface 11c of which is the mandrel. 3, a cylindrical surface having a constant diameter and concentric with the outer peripheral surface 3e of the cylindrical portion 3c of the mandrel 3 is formed with a material flow path 13 having a constant gap. Here, the material flow passage 13 on the inner circumference of the die 11 is set to have the same passage cross-sectional shape as the cylindrical material flow passage 4a formed between the cylindrical portion 3c of the mandrel 3 and the mold base 1. ing. Further, the tip of the base 11 and the tip of the mandrel 3 are at the same position in the axial direction, and between them,
The material flow path 13 opens as a discharge port 13a.
【００１６】上記口金１１は、上記フランジ部１１ｂの
外周に係合する略Ｌ字形断面を有する円環状のリテーナ
１５を介して上記金型基体１の先端面に固定されてい
る。具体的には、上記リテーナ１５を貫通する複数本
（例えば３本）のボルト１６が、金型基体１に螺合して
いるとともに、各ボルト１６に、円筒状のスペーサ１７
が配置されており、このスペーサ１７によって、フラン
ジ部１１ｂと金型基体１先端面との間に、所定の間隙が
保持されるようになっている。また、上記リテーナ１５
は、上記フランジ部１１ｂの外径に一致した内径を有
し、該フランジ部１１ｂが十分な精度でもって嵌合して
いる。そして、組立状態において、上記リテーナ１５の
内周面が上記フランジ部１１ｂから軸方向へ僅かに突出
するように、リテーナ１５の軸方向の寸法が設定されて
いる。The die 11 is fixed to the tip surface of the die base 1 through an annular retainer 15 having a substantially L-shaped cross section that engages with the outer periphery of the flange portion 11b. Specifically, a plurality of (for example, three) bolts 16 penetrating the retainer 15 are screwed into the mold base 1, and each of the bolts 16 has a cylindrical spacer 17.
Is arranged, and a predetermined gap is held between the flange portion 11b and the front end surface of the mold base 1 by the spacer 17. In addition, the retainer 15
Has an inner diameter that matches the outer diameter of the flange 11b, and the flange 11b is fitted with sufficient accuracy. The axial dimension of the retainer 15 is set so that the inner peripheral surface of the retainer 15 slightly projects in the axial direction from the flange portion 11b in the assembled state.
【００１７】上記流量調整部材１２は、図２にも示すよ
うに、その外周面１２ａが、上記フランジ部１１ｂと等
しい径の円筒面からなる。従って、組立状態では、軸方
向の一端部が上記リテーナ１５の内周面に十分な精度で
もって嵌合している。また、金型基体１の先端面には、
この流量調整部材１２の外径と等しい径を有する円形の
浅い凹部１４が加工されており、上記流量調整部材１２
の他方の端部が、この凹部１４に十分な精度でもって嵌
合している。つまり、上記流量調整部材１２が凹部１４
内周およびリテーナ１５内周にそれぞれ嵌合すること
で、金型基体１と流量調整部材１２と口金１１との三者
が互いに径方向に精度良く位置決めされ、これらの同心
状態、ひいては口金１１における材料流路１３の同心状
態が確実に得られるようになっている。また、上記スペ
ーサ１７は、上記流量調整部材１２を軸方向に固定しつ
つ過度に締め付けないように軸方向寸法が設定されてお
り、これにより、流量調整部材１２は、がたつくことな
く回転可能となっている。As shown in FIG. 2, the flow rate adjusting member 12 has an outer peripheral surface 12a formed of a cylindrical surface having the same diameter as the flange portion 11b. Therefore, in the assembled state, one end portion in the axial direction is fitted to the inner peripheral surface of the retainer 15 with sufficient accuracy. Further, on the tip surface of the mold base 1,
A circular shallow recess 14 having a diameter equal to the outer diameter of the flow rate adjusting member 12 is processed, and the flow rate adjusting member 12 is formed.
The other end of is fitted in the recess 14 with sufficient accuracy. That is, the flow rate adjusting member 12 is formed in the recess 14
By fitting the inner circumference and the inner circumference of the retainer 15 respectively, the mold base 1, the flow rate adjusting member 12, and the mouthpiece 11 are accurately positioned in the radial direction with respect to each other. The concentric state of the material flow path 13 is surely obtained. Further, the spacer 17 has an axial dimension set such that the flow rate adjusting member 12 is fixed in the axial direction and is not excessively tightened, whereby the flow rate adjusting member 12 can rotate without rattling. ing.
【００１８】図２に示すように、上記流量調整部材１２
は、その内周面１２ｂが真円形の円筒面をなしている
が、この内周面１２ｂの中心は、外周面１２ａの中心に
対し、所定量だけ偏心している。従って、組立状態で
は、内周面１２ｂはマンドレル３の外周面３ｅに対し一
方に偏心した状態となり、両者間の材料流路１９の通路
断面積は、周方向の一部で相対的に狭く、これと１８０
°異なる方向で相対的に広くなっている。ここで、本実
施例では、上記内周面１２ｂの径は、口金１１の内周面
１１ｃと等しい径であり、単に一方に偏った形となって
いる。また、その偏心量は、材料の流動性等に対応し
て、材料流路１３の半径寸法の範囲内で適宜に設定され
ているが、偏心量が異なる複数種の流量調整部材１２を
予め用意し、これを必要に応じ選択して組み付けるよう
にしてもよい。なお、上記流量調整部材１２の外周の複
数箇所（例えば９０°毎の４箇所）に、半径方向に沿っ
た治具挿入孔１８が形成されており、例えばドライバの
ような治具を差し込んで手作業により流量調整部材１２
の回転位置を調整することができるようになっている。As shown in FIG. 2, the flow rate adjusting member 12 is provided.
The inner peripheral surface 12b is a true circular cylindrical surface, and the center of the inner peripheral surface 12b is eccentric to the center of the outer peripheral surface 12a by a predetermined amount. Therefore, in the assembled state, the inner peripheral surface 12b is eccentric to the outer peripheral surface 3e of the mandrel 3 in one direction, and the passage cross-sectional area of the material flow passage 19 between them is relatively narrow in a part in the circumferential direction. This and 180
° Wider in different directions. Here, in the present embodiment, the diameter of the inner peripheral surface 12b is the same as the diameter of the inner peripheral surface 11c of the mouthpiece 11, and is simply biased to one side. Further, the eccentricity amount is appropriately set within the range of the radial dimension of the material flow path 13 in accordance with the fluidity of the material, but a plurality of types of flow rate adjusting members 12 having different eccentricity amounts are prepared in advance. However, this may be selected and assembled as needed. It should be noted that jig insertion holes 18 along the radial direction are formed at a plurality of locations (for example, four locations at 90 ° intervals) on the outer periphery of the flow rate adjusting member 12, and a jig such as a driver is inserted into the hand insertion holes 18 for example. Flow rate adjusting member 12 depending on work
The rotation position of can be adjusted.
【００１９】上記のように構成された金型においては、
例えば可塑化したゴム材料が材料供給孔２から供給さ
れ、環状をなす材料流路４，１９，１３を通して、先端
の吐出口１３ａから押し出される。これにより、中空管
つまり未加硫ゴムホースが連続的に成形される。ここ
で、上記の金型は、図示せぬヒータにより加熱されてい
るが、その温度分布のばらつき、あるいは材料供給孔２
に対する材料供給方向などに起因して、周方向のある特
定の方向で成形品の肉厚が相対的に厚くなる傾向を示
す。これに対し、上記金型では、このように厚肉となる
方向に、流量調整部材１２内周の環状流路１９が狭くな
る方向が一致するように、流量調整部材１２の回転位置
を調整すれば、その周方向部分での材料流量が制限され
る。その結果、全周に亘ってほぼ均一な肉厚を有する成
形品を得ることができる。In the mold constructed as described above,
For example, a plasticized rubber material is supplied from the material supply hole 2 and is extruded from the discharge port 13a at the tip through the material passages 4, 19 and 13 having an annular shape. Thereby, the hollow tube, that is, the unvulcanized rubber hose is continuously molded. Here, the mold is heated by a heater (not shown).
Due to the material supply direction and the like, the wall thickness of the molded product tends to be relatively thick in a specific circumferential direction. On the other hand, in the mold, the rotational position of the flow rate adjusting member 12 is adjusted so that the direction in which the annular flow passage 19 on the inner circumference of the flow rate adjusting member 12 becomes narrower coincides with the direction in which the flow rate adjusting member 12 becomes thicker. For example, the material flow rate in the circumferential portion is limited. As a result, a molded product having a substantially uniform wall thickness over the entire circumference can be obtained.
【００２０】特に、この実施例では、均一な隙間を有す
る平行な材料流路４ａ，１３の中間部に、偏心した材料
流路１９が位置しており、この材料流路１９で流量分布
が調整された材料の流れが、口金１１内周の材料流路１
３で均一な層流となった上で、先端の吐出口１３ａから
押し出されるため、吐出口１３ａを偏心させた場合のよ
うな成形品の曲がりが生じにくい。In particular, in this embodiment, an eccentric material flow passage 19 is located in the middle of the parallel material flow passages 4a, 13 having a uniform gap, and the flow distribution is adjusted by this material flow passage 19. The flow of the generated material is the material flow path 1 on the inner circumference of the base 11.
Since a uniform laminar flow is obtained in No. 3, the ejection is extruded from the ejection port 13a at the tip, so that the bending of the molded product is unlikely to occur when the ejection port 13a is eccentric.
【００２１】なお、上記実施例のように、流量調整部材
１２に真円形の孔を偏心させて設けるようにすれば、そ
の加工が非常に簡単である利点があるが、本発明はこれ
に限定されるものではなく、他の種々の通路形状が可能
である。例えば、一方に膨らんだ楕円形の孔、あるいは
円形の孔の一方の側に、さらに凹溝を加工したもの、な
ど、周方向で通路断面積が異なるようにした種々の形状
が可能である。If the flow rate adjusting member 12 is provided with eccentric circular holes as in the above-described embodiment, it has the advantage that the machining is very simple, but the present invention is not limited to this. However, various other channel configurations are possible. For example, various shapes having different passage cross-sectional areas in the circumferential direction are possible, such as an elliptical hole bulging on one side or a concave hole further processed on one side of a circular hole.
【００２２】[0022]
【発明の効果】以上の説明で明らかなように、この発明
に係る中空管押出成形用金型によれば、温度分布のばら
つき等に起因する偏肉を、簡単な構造でもって非常に小
さく抑制することができ、しかも、従来の吐出口を偏心
させた場合のような成形品の曲がりを生じることがな
い。従って、全周に亘って一定の肉厚でかつ曲がりのな
い中空成形品を得ることができる。また、偏肉の方向に
対する調整作業が極めて簡単となり、作業性に優れたも
のとなる。As is apparent from the above description, according to the hollow tube extrusion molding die of the present invention, uneven thickness due to variations in temperature distribution and the like is extremely small with a simple structure. It can be suppressed, and the bending of the molded product unlike the conventional eccentricity of the ejection port does not occur. Therefore, it is possible to obtain a hollow molded product having a constant wall thickness and no bending over the entire circumference. Further, the adjustment work in the direction of the uneven thickness becomes extremely simple and the workability becomes excellent.
【図１】この発明に係る金型の一実施例を示す縦断面
図。FIG. 1 is a vertical sectional view showing an embodiment of a mold according to the present invention.
【図２】図１のＡ−Ａ線に沿った断面図。FIG. 2 is a sectional view taken along the line AA of FIG.
１…金型基体 ３…マンドレル ４，１３，１９…材料流路 １１…口金 １２…流量調整部材 １５…リテーナ 1 ... Mold base 3 ... Mandrel 4, 13, 19 ... Material flow path 11 ... Clasp 12 ... Flow rate adjusting member 15 ... Retainer
フロントページの続き (72)発明者 遠藤 芳弥 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 (72)発明者 吉野 重夫 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 (72)発明者 久保 登 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 (72)発明者 岩本 弘一 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 (72)発明者 青木 利彰 埼玉県入間市大字新光235番地 帝都ゴム 株式会社内 Ｆターム(参考） 4F207 AG08 KA01 KA17 KL74 KL88Continued front page (72) Inventor Yoshiya Endo 330 Kuma, Naganuma-cho, Inage-ku, Chiba-shi, Chiba Kawaruba Industry Co., Ltd. (72) Inventor Shigeo Yoshino 330 Kuma, Naganuma-cho, Inage-ku, Chiba-shi, Chiba Kawaruba Industry Co., Ltd. (72) Inventor Noboru Kubo 330 Kuma, Naganuma-cho, Inage-ku, Chiba-shi, Chiba Kawaruba Industry Co., Ltd. (72) Inventor Koichi Iwamoto 330 Kuma, Naganuma-cho, Inage-ku, Chiba-shi, Chiba Kawaruba Industry Co., Ltd. (72) Inventor Toshiaki Aoki 235 Shinko, Iruma City, Saitama Prefecture Teito Rubber Within the corporation F-term (reference) 4F207 AG08 KA01 KA17 KL74 KL88
Claims (3)
金の内周側に同心状に配置されるとともに円筒状の外周
面を有するマンドレルと、を備え、両者間に形成された
円筒状の材料流路から材料が押し出される中空管押出成
形用金型において、 上記口金の上流側に、上記マンドレルを囲む円環状をな
す流量調整部材が回転可能に配置されており、この流量
調整部材の内周面と上記マンドレルとの間に形成される
流路は、周方向で不均一な通路断面積を有することを特
徴とする中空管押出成形用金型。1. A cylinder formed between a base having a cylindrical inner peripheral surface and a mandrel arranged concentrically on the inner peripheral side of the base and having a cylindrical outer peripheral surface. In a hollow tube extrusion molding die in which a material is extruded from a material flow path, an annular flow rate adjusting member surrounding the mandrel is rotatably arranged on the upstream side of the mouthpiece. A hollow tube extrusion molding die, wherein a flow path formed between the inner peripheral surface of the member and the mandrel has a non-uniform passage cross-sectional area in the circumferential direction.
周面に対し偏心した円筒状の内周面を有することを特徴
とする請求項１に記載の中空管押出成形用金型。2. The hollow tube extrusion molding die according to claim 1, wherein the flow rate adjusting member has a cylindrical inner peripheral surface eccentric to the outer peripheral surface of the mandrel.
基部側を囲む金型基体と上記口金との間に挟持されてお
り、上記金型基体から上記口金に亘って形成された周方
向に均一な円筒状の材料流路の軸方向の中間位置に該流
量調整部材が位置していることを特徴とする請求項１ま
たは２に記載の中空管押出成形用金型。3. The flow rate adjusting member is sandwiched between a die base surrounding the base side of the mandrel and the die, and is uniform in the circumferential direction formed from the die base to the die. The hollow tube extrusion molding die according to claim 1 or 2, wherein the flow rate adjusting member is located at an intermediate position in the axial direction of the cylindrical material flow passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002008132A JP2003211521A (en) | 2002-01-17 | 2002-01-17 | Mold for extrusion molding of hollow pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002008132A JP2003211521A (en) | 2002-01-17 | 2002-01-17 | Mold for extrusion molding of hollow pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003211521A true JP2003211521A (en) | 2003-07-29 |
Family
ID=27646477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002008132A Pending JP2003211521A (en) | 2002-01-17 | 2002-01-17 | Mold for extrusion molding of hollow pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003211521A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285085A (en) * | 2011-05-15 | 2011-12-21 | 宁波市天基汽车部件有限公司 | Rubber tube extruder head of rubber and plastic extruder without need of eccentric adjustment |
| KR101333504B1 (en) | 2013-05-03 | 2013-11-28 | 김지영 | Square pvc pipe extrusion for a mold |
| JPWO2015040718A1 (en) * | 2013-09-19 | 2017-03-02 | テルモ株式会社 | Syringe with needle and mold for injection molding thereof |
| KR20200043685A (en) * | 2018-10-18 | 2020-04-28 | (주)엘지하우시스 | Mandrel for preparing hollow profile |
-
2002
- 2002-01-17 JP JP2002008132A patent/JP2003211521A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285085A (en) * | 2011-05-15 | 2011-12-21 | 宁波市天基汽车部件有限公司 | Rubber tube extruder head of rubber and plastic extruder without need of eccentric adjustment |
| KR101333504B1 (en) | 2013-05-03 | 2013-11-28 | 김지영 | Square pvc pipe extrusion for a mold |
| JPWO2015040718A1 (en) * | 2013-09-19 | 2017-03-02 | テルモ株式会社 | Syringe with needle and mold for injection molding thereof |
| KR20200043685A (en) * | 2018-10-18 | 2020-04-28 | (주)엘지하우시스 | Mandrel for preparing hollow profile |
| KR102269231B1 (en) | 2018-10-18 | 2021-06-24 | (주)엘지하우시스 | Mandrel for preparing hollow profile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4484877A (en) | Twin-nozzle extrusion head | |
| US5152163A (en) | Continuous extrusion apparatus | |
| AU635471B2 (en) | Multiple layer die head with adjustable gaps | |
| US11292177B2 (en) | Cooling device with a cooling gas ring and a flow guiding device | |
| US20080131542A1 (en) | Device for extruding hollow strands | |
| GB1422625A (en) | Extrusion blowhead for tubular film | |
| JP2003211521A (en) | Mold for extrusion molding of hollow pipe | |
| US3709645A (en) | Extrusion head | |
| AU2008322722B2 (en) | Continuous extrusion apparatus | |
| US3270371A (en) | Axial extruder head with mandrel for extruding hollow profiles | |
| JP4252307B2 (en) | Extrusion equipment for producing products based on rubber compounds | |
| JPH05138715A (en) | Mold for extrusion molding of hollow material made of resin such as pipe | |
| US8936460B2 (en) | Extrusion head with high volume reservoir | |
| JP4125843B2 (en) | Coated extrusion mold | |
| US1603325A (en) | Tube machine | |
| JP3693435B2 (en) | Spiral die | |
| JP5657272B2 (en) | Extrusion head structure | |
| JP4369925B2 (en) | Nozzle head for extrusion machine | |
| JPH03147829A (en) | Nozzle head for extruding resin | |
| JP2010253863A (en) | Wall thickness adjustment structure of extrusion molding mold | |
| JPS6229221Y2 (en) | ||
| KR200218590Y1 (en) | Mandrel Support Structure for Extrusion Dies | |
| JPH09327854A (en) | Thickness irregularity adjusting apparatus and extrusion molding machine | |
| JPS5938254Y2 (en) | extrusion molding machine | |
| JP2001145951A (en) | Extrusion die |