JP5473347B2 - Extrusion mold - Google Patents

Extrusion mold Download PDF

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JP5473347B2
JP5473347B2 JP2009027464A JP2009027464A JP5473347B2 JP 5473347 B2 JP5473347 B2 JP 5473347B2 JP 2009027464 A JP2009027464 A JP 2009027464A JP 2009027464 A JP2009027464 A JP 2009027464A JP 5473347 B2 JP5473347 B2 JP 5473347B2
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mandrel
concave flow
thermoplastic resin
peripheral surface
concave
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JP2010179633A (en
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彰嘉 辻
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Gunze Ltd
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Gunze Ltd
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    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/695—Flow dividers, e.g. breaker plates
    • B29C48/70—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows
    • B29C48/705—Flow dividers, e.g. breaker plates comprising means for dividing, distributing and recombining melt flows in the die zone, e.g. to create flow homogeneity
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/3001—Extrusion nozzles or dies characterised by the material or their manufacturing process
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

本発明は、熱可塑性樹脂を環状のシームレス（無継目）製品になるよう成形する押出成形金型に関する。   The present invention relates to an extrusion mold for molding a thermoplastic resin so as to be an annular seamless (seamless) product.

従来、シームレス製品を成形するのに、軸状のマンドレルをシリンダ状のダイボディーに挿入した押出成形金型が使用されている。しかしながら、マンドレルとダイボディーとの間隙の全周に、熱可塑性樹脂を一様な圧力、又は速度で流し込むことは困難であるため、シームレス製品の肉厚に偏りのできることを避けられない。また、マンドレルの周面に複数のスパイラル溝を形成し、これらのスパイラル溝に、複数に分岐した導入路を経て熱可塑性樹脂をそれぞれ流入させる技術はある。しかしながら、個々のスパイラル溝に分かれて案内される熱可塑性樹脂が互いに接触することで境界ができ、これを原因とするウェルドがシームレス製品の品質を低下させる。下記の特許文献は押出成形金型を開示している。   Conventionally, an extrusion mold in which a shaft-shaped mandrel is inserted into a cylindrical die body is used to mold a seamless product. However, since it is difficult to flow the thermoplastic resin around the gap between the mandrel and the die body at a uniform pressure or speed, it is inevitable that the thickness of the seamless product can be biased. In addition, there is a technique in which a plurality of spiral grooves are formed on the peripheral surface of the mandrel, and a thermoplastic resin is caused to flow into these spiral grooves through a plurality of introduction paths. However, the thermoplastic resin guided by being divided into individual spiral grooves makes a boundary when they are in contact with each other, and the weld caused by this causes the quality of the seamless product to deteriorate. The following patent document discloses an extrusion mold.

特開平１１−１５６９１６号公報JP 11-156916 A

本発明は、上記の実情に鑑みて為されたものであり、熱可塑性樹脂の流れを制御し、シームレス製品の品質を安定させることのできる押出成形金型を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object thereof is to provide an extrusion mold capable of controlling the flow of a thermoplastic resin and stabilizing the quality of a seamless product.

本発明は上記目的を達成するため、周面を有し一端と他端が画定された軸状のマンドレルを、シリンダ状のダイボディーに挿入し、前記マンドレルと前記ダイボディーとの間隙に供給される熱可塑性樹脂を、前記マンドレルの一端から他端へ向かう押出方向に導く押出成形金型において、前記マンドレルの周面に形成され、前記周面の周方向に両端部を互いに反対向きに延ばし、前記両端部がそれぞれ延びるに従って狭くなる凹状拡流部と、前記凹状拡流部を前記周方向で二分する位置で、前記凹状拡流部に接続し、前記凹状拡流部に熱可塑性樹脂を導入する導入路と、前記マンドレルの周面の前記凹状拡流部から前記押出方向に隔たる位置を始端とし、前記マンドレルの他端へ向けて前記始端から螺旋状に延び、前記始端から延びるに従って狭くなる複数のスパイラル溝と、を備えることを特徴とする。   In order to achieve the above object, the present invention inserts a shaft-shaped mandrel having a peripheral surface and one end and the other end into a cylindrical die body, and is supplied to the gap between the mandrel and the die body. In an extrusion mold that guides the thermoplastic resin in the extrusion direction from one end to the other end of the mandrel, formed on the peripheral surface of the mandrel, extending both ends in opposite directions in the circumferential direction of the peripheral surface, A concave flow-spreading portion that becomes narrower as each of the both ends extends, and a position at which the concave flow-spreading portion bisects in the circumferential direction are connected to the concave flow-spreading portion, and a thermoplastic resin is introduced into the concave flow-spreading portion. The starting path is a position spaced from the concave flow-spreading portion of the peripheral surface of the mandrel in the extrusion direction, extends from the starting end in a spiral shape toward the other end of the mandrel, and extends from the starting end. Narrow a plurality of spiral grooves, characterized in that it comprises a.

また、本発明は、前記凹状拡流部に前記複数のスパイラル溝の始端が対向し、前記マンドレルの周面の前記凹状拡流部から前記複数のスパイラル溝の始端までの領域に、前記凹状拡流部の両端部がそれぞれ延びる方向へ向かうに従って、前記マンドレルと前記ダイボディーとの間隙が広がるよう起伏面を設けたことを特徴とする。   In the present invention, the concave ends of the plurality of spiral grooves are opposed to the concave expanding portions, and the concave expanding portions are formed in a region from the concave expanding portions of the peripheral surface of the mandrel to the starting ends of the plurality of spiral grooves. A undulating surface is provided so that a gap between the mandrel and the die body is widened as both ends of the flow part extend in the extending direction.

また、本発明は、前記複数のスパイラル溝の始端同士の間を熱可塑性樹脂が通過するのを規制する凸部を、前記マンドレルの周面に設けたことを特徴とする。   Further, the present invention is characterized in that a convex portion for restricting a thermoplastic resin from passing between the start ends of the plurality of spiral grooves is provided on the peripheral surface of the mandrel.

本発明に係る押出成形金型によれば、導入路から凹状拡流部に供給される熱可塑性樹脂は、マンドレルとダイボディーとの間隙を通り抜け、複数のスパイラル溝に達する。この過程で、複数のスパイラル溝にそれぞれ流入する熱可塑性樹脂の流れは一様になる。更に、熱可塑性樹脂は、複数のスパイラル溝に案内されながら押出方向へ導かれ、マンドレルとダイボディーとの間隙が熱可塑性樹脂によって満たされる。このような熱可塑性樹脂から成形されるシームレス製品は全周の肉厚が均一に仕上がる。また、当該押出成形金型によれば、シームレス製品にウェルドが発生する原因を上記の過程から排除できるので、品質の安定したシームレス製品を量産することができる。   According to the extrusion mold according to the present invention, the thermoplastic resin supplied from the introduction path to the concave flow expanding portion passes through the gap between the mandrel and the die body and reaches a plurality of spiral grooves. In this process, the flow of the thermoplastic resin flowing into each of the plurality of spiral grooves becomes uniform. Further, the thermoplastic resin is guided in the extrusion direction while being guided by the plurality of spiral grooves, and the gap between the mandrel and the die body is filled with the thermoplastic resin. A seamless product molded from such a thermoplastic resin has a uniform thickness on the entire circumference. Further, according to the extrusion mold, the cause of welds in the seamless product can be eliminated from the above process, so that a seamless product with stable quality can be mass-produced.

また、本発明に係る押出成形金型は、マンドレルの周面に凸部を設けても良い。この場合、複数のスパイラル溝の始端同士の間を熱可塑性樹脂が通過するのを凸部によって規制し、凹状拡流部から流出する熱可塑性樹脂がスパイラル溝の始端を指向するように、熱可塑性樹脂を整流することができる。   The extrusion mold according to the present invention may be provided with a convex portion on the peripheral surface of the mandrel. In this case, the thermoplastic resin is controlled such that the thermoplastic resin passes between the start ends of the plurality of spiral grooves by the convex portion, and the thermoplastic resin flowing out from the concave flow expanding portion is directed to the start end of the spiral groove. Resin can be rectified.

本発明の実施形態に係る押出成形金型に適用したマンドレルの斜視図。The perspective view of the mandrel applied to the extrusion metal mold | die which concerns on embodiment of this invention. 本発明の実施形態に係る押出成形金型の断面図。Sectional drawing of the extrusion mold which concerns on embodiment of this invention. 本発明の実施形態に係る押出成形金型に適用したマンドレルの周面の第１例を示す展開図。The expanded view which shows the 1st example of the surrounding surface of the mandrel applied to the extrusion die which concerns on embodiment of this invention. 図３のマンドレルをＡ−Ａ線で破断した断面図。Sectional drawing which fractured | ruptured the mandrel of FIG. 3 by the AA line. （ａ）は図３のマンドレルをＢ−Ｂ線で破断した断面図、（ｂ）はその変形例を示す断面図。(A) is sectional drawing which fractured | ruptured the mandrel of FIG. 3 by the BB line, (b) is sectional drawing which shows the modification. 本発明の実施形態に係る押出成形金型に適用したマンドレルの周面の第２例を示す展開図。The expanded view which shows the 2nd example of the surrounding surface of the mandrel applied to the extrusion mold which concerns on embodiment of this invention. 本発明の実施形態に係る押出成形金型に適用したマンドレルの周面の第３例を示す展開図。The expanded view which shows the 3rd example of the surrounding surface of the mandrel applied to the extrusion die which concerns on embodiment of this invention. 本発明の実施形態に係る押出成形金型に適用したマンドレルの周面の第４例を示す展開図。The expanded view which shows the 4th example of the surrounding surface of the mandrel applied to the extrusion die which concerns on embodiment of this invention.

図１，２に示すように、押出成形金型１は、周面３を有する軸状のマンドレル５を、シリンダ状のダイボディー７に挿入し、マンドレル５とダイボディー７との間隙９に供給される熱可塑性樹脂を、マンドレル５の一端１１から他端１３へ向かう押出方向に導くものである。矢印Ｆは押出方向を指している。マンドレル５の周面３には、凹状拡流部１５と導入路１７と複数のスパイラル溝１９とが形成されている。矢印Ｓは周面３の周方向を指している。符号８，１０は、押出成形金型１のダイ、及びアジャストリングを各々指している。   As shown in FIGS. 1 and 2, in the extrusion mold 1, an axial mandrel 5 having a peripheral surface 3 is inserted into a cylindrical die body 7 and supplied to a gap 9 between the mandrel 5 and the die body 7. The thermoplastic resin is guided in the extrusion direction from the one end 11 to the other end 13 of the mandrel 5. Arrow F points in the direction of extrusion. On the peripheral surface 3 of the mandrel 5, a concave flow expanding portion 15, an introduction path 17, and a plurality of spiral grooves 19 are formed. An arrow S indicates the circumferential direction of the circumferential surface 3. Reference numerals 8 and 10 respectively denote a die and an adjust ring of the extrusion mold 1.

マンドレル５は、その一端１１に設けたフランジ２１をボルト等を用いてダイボディー７に取付けられる。マンドレル５の他端１３は、マンドレル５に接合されたコア２３に滑らかに連なる。マンドレル５の周面３の直径は、一端１１から凹状拡流部１５までの範囲で最大である。周面３を展開して表した図３にドットを付した領域は、周面３の直径が最小になるよう絞られた縮径部２５である。図示のマンドレル５は他端１３を上向きにしているが、この姿勢に押出成形金型１の使用される向きが限定されることはない。   The mandrel 5 is attached to the die body 7 with a flange 21 provided at one end 11 thereof using a bolt or the like. The other end 13 of the mandrel 5 is smoothly connected to the core 23 joined to the mandrel 5. The diameter of the peripheral surface 3 of the mandrel 5 is the largest in the range from the one end 11 to the concave flow spreading portion 15. A region marked with dots in FIG. 3 in which the peripheral surface 3 is developed is a reduced diameter portion 25 that is narrowed so that the diameter of the peripheral surface 3 is minimized. Although the illustrated mandrel 5 has the other end 13 facing upward, the orientation in which the extrusion mold 1 is used is not limited to this posture.

図３のＢ−Ｂ線は、マンドレル５の周面３の約１８０°に相当する区間であり、周面３の全周には、２つの凹状拡流部１５が配置されている。凹状拡流部１５は、その両側の端部２７を周方向に沿って互いに反対向きに延ばした三日月形の凹部である。凹状拡流部１５の内側には傾斜面１６が設けられている。凹状拡流部１５の形状は、両側の端部２７が互いに反対向きに延びるに従って狭くなるものであれば良い。ここで、狭くなるとは、両側の端部２７の幅の減少すること、図４に仮想線で表したダイボディー７の内周面２９から凹状拡流部１５の底面３１までの奥行きが浅くなること、又はこれらの両方を含むことを意味する。   3 is a section corresponding to about 180 ° of the peripheral surface 3 of the mandrel 5, and two concave flow spreading portions 15 are arranged on the entire periphery of the peripheral surface 3. The concave flow expanding portion 15 is a crescent-shaped concave portion in which the end portions 27 on both sides thereof extend in opposite directions along the circumferential direction. An inclined surface 16 is provided inside the concave flow spreading portion 15. The shape of the concave flow expanding portion 15 may be any shape as long as the end portions 27 on both sides extend in opposite directions. Here, narrowing means that the widths of the end portions 27 on both sides are reduced, and the depth from the inner peripheral surface 29 of the die body 7 to the bottom surface 31 of the concave flow spreading portion 15 shown by phantom lines in FIG. Or both of them are meant to be included.

図２，３に示すように、導入路１７は、凹状拡流部１５を周方向で２等分する位置で、凹状拡流部１５に接続した溝形の流路である。上記の２等分する位置は、凹状拡流部１５の幾何学的中心線に相当する。また、導入路１７は、アダプターノズル３３から供給される熱可塑性樹脂を凹状拡流部１５に導入するものであり、その全長、幅、又は形状が限定されことはない。   As shown in FIGS. 2 and 3, the introduction path 17 is a groove-shaped flow path connected to the concave flow expanding portion 15 at a position where the concave flow expanding portion 15 is equally divided into two in the circumferential direction. The above-mentioned bisecting position corresponds to the geometric center line of the concave flow spreading portion 15. Moreover, the introduction path 17 introduces the thermoplastic resin supplied from the adapter nozzle 33 into the concave flow expanding portion 15, and the total length, width, or shape thereof is not limited.

スパイラル溝１９は、マンドレル５の周面３において凹状拡流部１５から押出方向に隔たる位置を始端３５とし、マンドレル５の他端１３へ向けて始端３５から螺旋状に延びている。スパイラル溝１９の形状は、始端３５から延びるに従って狭くなるものであれば良い。ここで、狭くなるとは、溝幅の減少すること、ダイボディー７の内周面２９からスパイラル溝１９の底面３７までの奥行きが浅くなること、又はこれらの両方を含むことを意味する。また、周面３のスパイラル溝１９が形成される領域には、図４に示すように周面３の直径が押出方向へ向かうに従って減少するように、テーパーを設けることが好ましい。   The spiral groove 19 has a start end 35 at a position separated from the concave flow expanding portion 15 on the peripheral surface 3 of the mandrel 5 in the extrusion direction, and extends spirally from the start end 35 toward the other end 13 of the mandrel 5. The spiral groove 19 may have any shape that becomes narrower as it extends from the start end 35. Here, narrowing means that the groove width is reduced, the depth from the inner peripheral surface 29 of the die body 7 to the bottom surface 37 of the spiral groove 19 is reduced, or both of them are included. Moreover, it is preferable to provide a taper in the area | region where the spiral groove 19 of the surrounding surface 3 is formed so that the diameter of the surrounding surface 3 may decrease as it goes to an extrusion direction, as shown in FIG.

以上に述べた押出成形金型１によれば、図３に示す導入路１７から凹状拡流部１５に熱可塑性樹脂が供給されると、熱可塑性樹脂は図４に示す傾斜面１６に沿って凹状拡流部１５から流出し、マンドレル５の縮径部２５とダイボディー７の内周面２９との間を通り抜け、複数のスパイラル溝１９に流入する。この過程で、熱可塑性樹脂の流れは、次のように制御される。   According to the extrusion mold 1 described above, when the thermoplastic resin is supplied from the introduction path 17 shown in FIG. 3 to the concave flow expanding portion 15, the thermoplastic resin is along the inclined surface 16 shown in FIG. The liquid flows out from the concave flow expanding portion 15, passes between the reduced diameter portion 25 of the mandrel 5 and the inner peripheral surface 29 of the die body 7, and flows into the plurality of spiral grooves 19. In this process, the flow of the thermoplastic resin is controlled as follows.

即ち、導入路１７から凹状拡流部１５に導入させる熱可塑性樹脂が凹状拡流部１５の内側で広がろうとする速度は、凹状拡流部１５に達した直後が最も速い。言い換えると、凹状拡流部１５を周方向で２等分する位置で最も速い。この位置から離れる程、上記の速度は遅くなる傾向を示すことから、凹状拡流部１５の両側の端部２７が互いに反対向きに延びるに従ってそれぞれ狭くなるようにしておけば、その分、熱可塑性樹脂が凹状拡流部１５の内側で加速されることになる。これにより、凹状拡流部１５から流出する熱可塑性樹脂の速度は、凹状拡流部１５の周方向の全域において一様化されるので、個々のスパイラル溝１９へ流入する熱可塑性樹脂の流れに差が生じることはない。   That is, the speed at which the thermoplastic resin introduced from the introduction path 17 into the concave flow spreading portion 15 tries to spread inside the concave flow spreading portion 15 is the fastest immediately after reaching the concave flow spreading portion 15. In other words, it is the fastest at the position where the concave flow spreading portion 15 is divided into two equal parts in the circumferential direction. The above-mentioned speed tends to decrease as the distance from the position increases. Therefore, if the end portions 27 on both sides of the concave flow-diffusing portion 15 are made narrower as they extend in opposite directions, the thermoplastic resin is correspondingly increased. The resin is accelerated inside the concave flow expanding portion 15. As a result, the speed of the thermoplastic resin flowing out from the concave flow expanding portion 15 is made uniform over the entire area in the circumferential direction of the concave flow expanding portion 15, so that the flow of the thermoplastic resin flowing into the individual spiral grooves 19 is reduced. There is no difference.

続いて、熱可塑性樹脂は、複数のスパイラル溝１９に案内されながら押出方向へ導かれ、マンドレル５とダイボディー７との間隙９が熱可塑性樹脂によって満たされる。更に、図２に示す押出成形金型１のリップ部２４から押出される熱可塑性樹脂が硬化し、全周で肉厚の均一なシームレス製品が得られる。   Subsequently, the thermoplastic resin is guided in the extrusion direction while being guided by the plurality of spiral grooves 19, and the gap 9 between the mandrel 5 and the die body 7 is filled with the thermoplastic resin. Further, the thermoplastic resin extruded from the lip portion 24 of the extrusion mold 1 shown in FIG. 2 is cured, and a seamless product having a uniform thickness on the entire circumference is obtained.

上記のように凹状拡流部１５から流出する熱可塑性樹脂は、縮径部２５と内周面２９との間を通り抜ける過程で、縮径部２５の全周に広がるので、従来のように個々のスパイラル溝に分かれて案内されることがない。このため、押出成形金型１は、シームレス製品にウェルドが発生する原因を排除できるので、品質の安定したシームレス製品を量産することができる。   As described above, the thermoplastic resin flowing out from the concave flow expanding portion 15 spreads over the entire circumference of the reduced diameter portion 25 in the process of passing between the reduced diameter portion 25 and the inner peripheral surface 29. It is not guided by being divided into spiral grooves. For this reason, since the extrusion mold 1 can eliminate the cause of welds in the seamless product, it is possible to mass-produce seamless products with stable quality.

また、周面３の凹状拡流部１５から複数のスパイラル溝１９の始端３５までの領域の断面は、図５（ａ）に示すように円形であることが好ましいが、同図（ｂ）に示すように、上記の領域に起伏面３９を設けても良い。例えば、粘性の比較的高い熱可塑性樹脂は、凹状拡流部１５で上記のような加速を十分に成されないことがある。この場合、凹状拡流部１５の両側の端部２７がそれぞれ延びる方向へ向かうに従って、起伏面３９とダイボディー７の内周面２９との間隙が広がるようにする。これにより、熱可塑性樹脂が凹状拡流部１５の両側の端部２７から押出方向に流出するのを促せるので、上記と同様に熱可塑性樹脂の速度の一様化を図ることができる。   Further, the cross section of the region from the concave flow expanding portion 15 of the peripheral surface 3 to the start ends 35 of the plurality of spiral grooves 19 is preferably circular as shown in FIG. 5A, but in FIG. As shown, an undulating surface 39 may be provided in the above region. For example, a thermoplastic resin having a relatively high viscosity may not be sufficiently accelerated in the concave flow expanding portion 15 as described above. In this case, the gap between the undulating surface 39 and the inner peripheral surface 29 of the die body 7 is increased as the end portions 27 on both sides of the concave flow expanding portion 15 extend in the extending direction. Thereby, since it can accelerate | stimulate that a thermoplastic resin flows out from the edge part 27 of the both sides of the concave flow expansion part 15 to an extrusion direction, the speed | rate of a thermoplastic resin can be equalized similarly to the above.

ムレス製品を量産することができる。
尚、本発明は、その趣旨を逸脱しない範囲で当業者の知識に基づいて種々なる改良、修正、又は変形を加えた態様でも実施でき、以下の態様で実施しても良い。図３は、１つの凹状拡流部１５に４条のスパイラル溝１９のそれぞれの始端３５を対向させた例を示しているが、凹状拡流部１５とスパイラル溝１９の数は限定されるものではない。図６に示すように、凹状拡流部１５の両側の端部２７に、スパイラル溝１９の始端３５を１つずつ対向させても良い。 Mass production of mules products is possible.
In addition, this invention can be implemented also in the aspect which added various improvement, correction, or a deformation | transformation based on the knowledge of those skilled in the art within the range which does not deviate from the meaning, and may be implemented in the following aspects. FIG. 3 shows an example in which the respective start ends 35 of the four spiral grooves 19 are opposed to one concave flow expanding portion 15, but the number of the concave flow expanding portions 15 and the spiral grooves 19 is limited. is not. As shown in FIG. 6, the start ends 35 of the spiral grooves 19 may be opposed to the end portions 27 on both sides of the concave flow expanding portion 15 one by one.

更に、図７，８に示すように、周面３のスパイラル溝１９同士の間に凸部４１を設けても良い。凸部４１は、周面３からダイボディー７の内周面２９に接するよう突出するものであり、複数のスパイラル溝１９の始端３５同士の間を熱可塑性樹脂が通過するのを規制できる。これにより、凹状拡流部１５から流出した熱可塑性樹脂は、スパイラル溝１９の始端３５を指向するよう整流される。   Further, as shown in FIGS. 7 and 8, a convex portion 41 may be provided between the spiral grooves 19 on the peripheral surface 3. The convex portion 41 protrudes from the peripheral surface 3 so as to be in contact with the inner peripheral surface 29 of the die body 7 and can restrict the passage of the thermoplastic resin between the start ends 35 of the plurality of spiral grooves 19. As a result, the thermoplastic resin that has flowed out of the concave flow expanding portion 15 is rectified so as to be directed toward the start end 35 of the spiral groove 19.

本発明は、精密な電子部品の製造に加え、あらゆる環状の製品を成形するのに有益な技術である。   The present invention is a useful technique for molding any annular product in addition to the manufacture of precision electronic components.

１…押出成形金型、３…周面、５…マンドレル、７…ダイボディー、９…間隙、１１…一端、１３…他端、１５…凹状拡流部、１６…傾斜面、１７…導入路、１９…スパイラル溝、２１…フランジ、２３…コア、２５…縮径部、２４…リップ部、２７…端部、２９…内周面、３１，３７…底面、３３…アダプターノズル、３５…始端、３９…起伏面、４１…凸部。   DESCRIPTION OF SYMBOLS 1 ... Extrusion metal mold | die, 3 ... Peripheral surface, 5 ... Mandrel, 7 ... Die body, 9 ... Gap, 11 ... One end, 13 ... Other end, 15 ... Concave flow expansion part, 16 ... Inclined surface, 17 ... Introduction path , 19 ... Spiral groove, 21 ... Flange, 23 ... Core, 25 ... Reduced diameter part, 24 ... Lip part, 27 ... End part, 29 ... Inner peripheral surface, 31, 37 ... Bottom face, 33 ... Adapter nozzle, 35 ... Starting end , 39 ... undulating surface, 41 ... convex portion.

Claims (2)

周面を有し一端と他端が画定された軸状のマンドレルを、シリンダ状のダイボディーに挿入し、前記マンドレルと前記ダイボディーとの間隙に供給される熱可塑性樹脂を、前記マンドレルの一端から他端へ向かう押出方向に導く押出成形金型において、
前記マンドレルの周面に形成され、前記周面の周方向に両端部を互いに反対向きに延ばし、前記両端部がそれぞれ延びるに従って狭くなる凹状拡流部と、
前記凹状拡流部を前記周方向で二分する位置で、前記凹状拡流部に接続し、前記凹状拡流部に熱可塑性樹脂を導入する導入路と、
前記マンドレルの周面の前記凹状拡流部から前記押出方向に隔たる位置を始端とし、前記マンドレルの他端へ向けて前記始端から螺旋状に延び、前記始端から延びるに従って狭くなる複数のスパイラル溝と、を備え、
前記凹状拡流部に前記複数のスパイラル溝の始端が対向し、前記マンドレルの周面の前記凹状拡流部から前記複数のスパイラル溝の始端までの領域に、前記凹状拡流部の両端部がそれぞれ延びる方向へ向かうに従って、前記マンドレルと前記ダイボディーとの間隙が広がるよう起伏面を設けたことを特徴とする押出成形金型。 An axial mandrel having a peripheral surface and defined at one end and the other is inserted into a cylindrical die body, and a thermoplastic resin supplied to a gap between the mandrel and the die body is inserted into one end of the mandrel. In the extrusion mold leading to the extrusion direction from the other end,
A concave current spreading portion formed on the circumferential surface of the mandrel, extending both ends in opposite directions in the circumferential direction of the circumferential surface, and narrowing as the both ends extend;
Introducing the thermoplastic resin into the concave flow spreading portion, connected to the concave flow spreading portion at a position that bisects the concave flow spreading portion in the circumferential direction;
A plurality of spiral grooves starting from a position spaced in the extrusion direction from the concave flow expanding portion of the peripheral surface of the mandrel, extending spirally from the starting end toward the other end of the mandrel, and narrowing as extending from the starting end and, with a,
The start ends of the plurality of spiral grooves are opposed to the concave flow spreading portions, and both end portions of the concave flow spreading portions are located in a region from the concave flow spreading portions to the start ends of the plurality of spiral grooves on the peripheral surface of the mandrel. An extrusion mold characterized in that a relief surface is provided so that a gap between the mandrel and the die body is widened in the extending direction . 前記複数のスパイラル溝の始端同士の間を熱可塑性樹脂が通過するのを規制する凸部を、前記マンドレルの周面に設けたことを特徴とする請求項１に記載の押出成形金型。 Extrusion die according to claim 1, characterized in that between the beginning ends of the plurality of spiral grooves the projecting portion for regulating the passage thermoplastic resin, provided on the peripheral surface of the mandrel.
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