JP2014076627A - Hollow screw, hollow screw manufacturing method, and hollow screw assembly manufacturing method - Google Patents

Hollow screw, hollow screw manufacturing method, and hollow screw assembly manufacturing method Download PDF

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JP2014076627A
JP2014076627A JP2012226584A JP2012226584A JP2014076627A JP 2014076627 A JP2014076627 A JP 2014076627A JP 2012226584 A JP2012226584 A JP 2012226584A JP 2012226584 A JP2012226584 A JP 2012226584A JP 2014076627 A JP2014076627 A JP 2014076627A
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screw
hollow
hollow screw
central axis
male
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Kaoru Hosoi
薫 細井
Seiya Mizuno
聖也 水野
Hidefumi Hisaku
秀文 桧作
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Shibaura Machine Co Ltd
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Toshiba Machine Co 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
    • B29C48/505—Screws
    • B29C48/51—Screws with internal flow passages, e.g. for molten material
    • B29C48/515—Screws with internal flow passages, e.g. for molten material for auxiliary fluids, e.g. foaming agents

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

Abstract

PROBLEM TO BE SOLVED: To provide a hollow screw which is used to carry and mix resin under processing while cooling the resin under processing by pouring a cooling agent in an internal hollow and in which occurrence of temperature unevenness of the resin under processing can be prevented.SOLUTION: A hollow screw 3 comprises a male-screw section 5 mounted at the outer peripheral side surface of a body section 25, and a female-screw section 7 mounted at the body section 25 so that the central axis coincides with the central axis of the body section 25, and, in the radial direction of the body section 25, the valley bottom coincides with the peak top of the male screw section 5, and the peak top coincides with the valley bottom of the male screw section 5.

Description

本発明は、中空スクリュ、中空スクリュの製造方法および中空スクリュ組立体の製造方法に係り、特に、合成樹脂成形機（プラスチック成形機）等に使用されるものに関する。   The present invention relates to a hollow screw, a method for producing a hollow screw, and a method for producing a hollow screw assembly, and more particularly, to one used for a synthetic resin molding machine (plastic molding machine).

従来、成形機のスクリュとして、円柱状の貫通孔が中心軸に沿って設けられた中空状のものが知られている（特許文献１参照）。そして、貫通孔内に冷却水等を流すことで、スクリュを適宜冷却している。   Conventionally, as a screw of a molding machine, a hollow one in which a cylindrical through hole is provided along the central axis is known (see Patent Document 1). Then, the screw is appropriately cooled by flowing cooling water or the like into the through hole.

特開平７−１８８７１１号公報JP-A-7-188711

ところで、上記従来の中空スクリュでは、冷却剤（たとえば冷却水）を流しているにもかかわらず、中空スクリュの表面温度が部位によって異なり、この中空スクリュの外周に接する被成形物（高温で溶融している樹脂等）に温度ムラが発生するという問題がある。   By the way, in the conventional hollow screw described above, the surface temperature of the hollow screw varies depending on the part even though a coolant (for example, cooling water) is flowing, and a molded object (melted at a high temperature) contacting the outer periphery of the hollow screw. There is a problem that temperature unevenness occurs in the resin etc.).

本発明は、上記問題点に鑑みてなされたものであり、内側の孔に冷却剤を流して被成形物を冷却するとともに上記被成形物を搬送したり混練したりする中空スクリュにおいて、上記被成形物に温度ムラが発生することを防ぐことができる中空スクリュ、中空スクリュの製造方法および中空スクリュ組立体の製造方法を提供することを目的とする。   The present invention has been made in view of the above problems, and in a hollow screw that cools a molding by flowing a coolant through an inner hole and transports or kneads the molding, An object of the present invention is to provide a hollow screw, a method for producing a hollow screw, and a method for producing a hollow screw assembly that can prevent occurrence of temperature unevenness in a molded product.

請求項１に記載の発明は、本体部の外周側面に設けられた雄ネジ状部と、中心軸が前記本体部の中心軸と一致し、前記本体部の径方向で、谷の底が前記雄ネジ状部の山の頂と一致し、山の頂が前記雄ネジ状部の谷の底と一致するように、前記本体部に設けられた雌ネジ状部とを有する中空スクリュである。   According to the first aspect of the present invention, the male thread-like portion provided on the outer peripheral side surface of the main body portion, the central axis coincides with the central axis of the main body portion, and the bottom of the valley is the radial direction of the main body portion. A hollow screw having a female screw-like portion provided in the main body portion so as to coincide with the top of the mountain of the male screw-like portion, and the top of the mountain coincides with the bottom of the valley of the male screw-like portion.

請求項２に記載の発明は、請求項１に記載の中空スクリュにおいて、前記雄ネジ状部と前記雌ネジ状部とは切削加工によって形成されている中空スクリュである。   The invention according to claim 2 is the hollow screw according to claim 1, wherein the male screw-like portion and the female screw-like portion are formed by cutting.

請求項３に記載の発明は、素材の側面部に雄ネジ状部を切削加工にて形成する雄ネジ状部形成工程と、前記素材の中心軸に沿って円柱状の孔を形成する孔形成工程と、前記雄ネジ状部形成工程で雄ネジ状を形成し、前記孔形成工程で孔を形成した後、前記孔形成工程で形成した孔に沿って、切削加工により、中心軸が前記円柱状の素材の中心軸と一致し、前記円柱状の素材の径方向で、谷の底が前記雄ネジ状部の山の頂と一致し、山の頂が前記雄ネジ状部の谷の底と一致している雌ネジ状部を形成する雌ネジ状部形成工程とを有する中空スクリュの製造方法である。   According to a third aspect of the present invention, there is provided a male screw-like portion forming step for forming a male screw-like portion on a side surface portion of a material by cutting, and a hole formation for forming a cylindrical hole along the central axis of the material. Forming a male screw shape in the step and the male screw-shaped portion forming step, forming a hole in the hole forming step, and then cutting along the hole formed in the hole forming step so that the central axis is the circle It coincides with the central axis of the columnar material, and in the radial direction of the columnar material, the bottom of the valley coincides with the top of the mountain of the male screw-like portion, and the top of the mountain reaches the bottom of the valley of the male screw-like portion Is a manufacturing method of a hollow screw having an internal thread-shaped part forming step of forming an internal thread-shaped part that coincides with.

請求項４に記載の発明は、請求項３に記載の中空スクリュの製造方法によって複数の中空スクリュを生成した後、これらの中空スクリュをこの長手方向でお互いに接続する接続工程とを有する中空スクリュ組立体の製造方法である。   According to a fourth aspect of the present invention, there is provided a hollow screw having a connecting step of connecting a plurality of hollow screws to each other in the longitudinal direction after producing a plurality of hollow screws by the hollow screw manufacturing method according to the third aspect. It is a manufacturing method of an assembly.

本発明によれば、内側の孔に冷却剤を流して被成形物を冷却するとともに上記被成形物を搬送したり混練したりする中空スクリュにおいて、上記被成形物に温度ムラが発生することを防ぐことができるという効果を奏する。   According to the present invention, in the hollow screw that cools the molding by flowing a coolant through the inner holes and transports or kneads the molding, temperature unevenness occurs in the molding. There is an effect that it can be prevented.

本発明の実施形態に係る中空スクリュ組立体の使用状態を示す図である。It is a figure which shows the use condition of the hollow screw assembly which concerns on embodiment of this invention. 本発明の実施形態に係る中空スクリュ組立体を構成する中空スクリュの製造途中の状態を示す図であり、（ｂ）は、（ａ）におけるＩＩ―ＩＩ断面を示す図である。It is a figure which shows the state in the middle of manufacture of the hollow screw which comprises the hollow screw assembly which concerns on embodiment of this invention, (b) is a figure which shows the II-II cross section in (a). 本発明の実施形態に係る中空スクリュ組立体を構成する中空スクリュの製造途中の状態を示す図であり、（ｂ）は、（ａ）におけるＩＩＩ―ＩＩＩ断面を示す図である。It is a figure which shows the state in the middle of manufacture of the hollow screw which comprises the hollow screw assembly which concerns on embodiment of this invention, (b) is a figure which shows the III-III cross section in (a). 本発明の実施形態に係る中空スクリュ組立体を構成する中空スクリュを示す図であり、（ａ）は、中心軸を含む平面による断面を示す図であり、（ｂ）は、（ａ）におけるＩＶ―ＩＶ断面を示す図である。It is a figure which shows the hollow screw which comprises the hollow screw assembly which concerns on embodiment of this invention, (a) is a figure which shows the cross section by the plane containing a central axis, (b) is IV in (a) FIG.

本発明の実施形態に係る中空スクリュ組立体１は、射出成形機や押出成形機等のプラスチック成形機に使用されるものであり、高温で溶融された合成樹脂を搬送するときに使用されるものである（たとえば、特開２００３−６２８９２号公報参照）。   A hollow screw assembly 1 according to an embodiment of the present invention is used for a plastic molding machine such as an injection molding machine or an extrusion molding machine, and is used when a synthetic resin melted at a high temperature is conveyed. (For example, refer to Japanese Patent Laid-Open No. 2003-62892).

中空スクリュ組立体１は、図１に示すように、複数の中空スクリュ３を、この長手方向（中心軸Ｃ１の延伸方向）でお互いに接続して生成されている。各中空スクリュ３の中心軸Ｃ１はお互いが一致している。   As shown in FIG. 1, the hollow screw assembly 1 is formed by connecting a plurality of hollow screws 3 to each other in the longitudinal direction (the extending direction of the central axis C1). The central axes C1 of the hollow screws 3 coincide with each other.

中空スクリュ組立体１では、１つの中空スクリュ３Ａの長手方向の端と、他の１つの中空スクリュ３Ｂの長手方向の端とがお互いに接続されており、各中空スクリュ３Ａ、３Ｂが一体化されている。   In the hollow screw assembly 1, the longitudinal end of one hollow screw 3A and the longitudinal end of another hollow screw 3B are connected to each other, and the hollow screws 3A and 3B are integrated. ing.

また、各中空スクリュ３Ａ，３Ｂの接続部では、中空スクリュ組立体１の雄ネジ状部５と雌ネジ状部７とが、段差等を生じることなく滑らかに連続してつながっている。なお、雄ネジ状部５と雌ネジ状部７とについての詳細は後述する。   Moreover, in the connection part of each hollow screw 3A, 3B, the external thread-like part 5 and the internal thread-like part 7 of the hollow screw assembly 1 are connected smoothly and continuously without causing a step or the like. Details of the male screw-like portion 5 and the female screw-like portion 7 will be described later.

中空スクリュ組立体１の長手方向の端部は、先端部構成体９で蓋をされている。中空スクリュ組立体１（中空スクリュ３）の雌ネジ状部７内には、筒状の冷媒（たとえば冷却水）供給パイプ１１が設けられている。   The end of the hollow screw assembly 1 in the longitudinal direction is covered with a tip component 9. A cylindrical refrigerant (for example, cooling water) supply pipe 11 is provided in the female threaded portion 7 of the hollow screw assembly 1 (hollow screw 3).

そして、供給パイプ１１により、雌ネジ状部７内（中空スクリュ組立体１内）に供給された冷媒によって、中空スクリュ組立体１が冷却され、高温で溶融された合成樹脂の温度が調整されるようになっている。   The supply pipe 11 cools the hollow screw assembly 1 by the refrigerant supplied into the female screw-shaped portion 7 (inside the hollow screw assembly 1), and adjusts the temperature of the synthetic resin melted at a high temperature. It is like that.

なお、合成樹脂の搬送は、中空スクリュ組立体１が中心軸Ｃ１を中心に回転することで、たとえば、図１の左側から右側に向かってなされるようになっている。   The synthetic resin is transported from the left side to the right side in FIG. 1, for example, by rotating the hollow screw assembly 1 about the central axis C1.

中空スクリュ３は、円柱状（円錐台状等の他の形状であってもよい。）の金属製の本体部（金属材料の素材）２５の外周側面に設けられた雄ネジ状部５と、本体部２５の内部に設けられた雌ネジ状部７とを備えて構成されている。   The hollow screw 3 is a male screw-like portion 5 provided on the outer peripheral side surface of a cylindrical main body (metal material) 25 (may be another shape such as a truncated cone). The main body portion 25 is provided with a female screw-like portion 7 provided inside.

雄ネジ状部５は樹脂を搬送するために設けられているのであるが、雌ネジ状部７は、中空スクリュ３の肉厚の差（部位の違いによる肉厚の差）を小さくし肉厚を均一にするために、もしくは、肉厚の差を極力小さくするために設けられている。   The male screw-like portion 5 is provided for transporting the resin, but the female screw-like portion 7 reduces the difference in thickness of the hollow screw 3 (thickness difference due to the difference in part) and increases the thickness. It is provided in order to make the difference uniform or to make the difference in thickness as small as possible.

さらに説明すると、雄ネジ状部５の中心軸と雌ネジ状部７の中心軸と円柱状の本体部２５の中心軸（本体部２５の円形状の底面の中心と本体部２５の円形状の上面の中心とを通る直線の軸）と中空スクリュ組立体１の中心軸Ｃ１とはお互いに一致している。   More specifically, the central axis of the male screw-like portion 5, the central axis of the female screw-like portion 7, the central axis of the cylindrical main body portion 25 (the center of the circular bottom surface of the main body portion 25 and the circular shape of the main body portion 25). A straight axis passing through the center of the upper surface) and the central axis C1 of the hollow screw assembly 1 coincide with each other.

また、本体部２５の径方向で、雌ネジ状部７の螺旋状の谷の底が雄ネジ状部５の螺旋状の山の頂と一致しており、雌ネジ状部７の螺旋状の山の頂が雄ネジ状部５の螺旋状の谷の底と一致している。   Further, in the radial direction of the main body portion 25, the bottom of the spiral valley of the female screw portion 7 coincides with the top of the spiral mountain of the male screw portion 5, and the spiral shape of the female screw portion 7 is formed. The top of the mountain coincides with the bottom of the spiral valley of the male screw-like portion 5.

換言すれば、中心軸Ｃ１と直交し雄ネジ状部５の山の頂を通る任意の直線上であって中心軸Ｃ１と雄ネジ状部５の山の頂との間に、雌ネジ状部７の谷の底が存在しており、中心軸Ｃ１と直交し雄ネジ状部５の谷の底を通る任意の直線上であって中心軸Ｃ１と雄ネジ状部５の山の頂との間に、雌ネジ状部７の山の頂が存在している。   In other words, the female screw-like portion is on an arbitrary straight line that is orthogonal to the central axis C1 and passes through the top of the male screw-like portion 5 and between the central axis C1 and the top of the male screw-like portion 5. The bottom of the valley of 7 exists and is on an arbitrary straight line passing through the bottom of the valley of the male screw-shaped part 5 perpendicular to the central axis C1 and between the central axis C1 and the peak of the male screw-shaped part 5 In the meantime, the crests of the female threaded portion 7 exist.

さらに説明すると、中心軸Ｃ１と直交する任意の平面による断面をとると（図４（ｂ）参照）、雄ネジ状部５の山の頂を形成する部位１３と、雌ネジ状部７の谷の底（谷の径を決定する底）とを形成する部位１５と中心軸Ｃ１とが１直線上に存在している。   More specifically, when a cross section is taken by an arbitrary plane orthogonal to the central axis C1 (see FIG. 4B), a portion 13 that forms the crest of the male screw-like portion 5 and a valley of the female screw-like portion 7 The part 15 and the central axis C1 forming the bottom (the bottom that determines the diameter of the valley) are on one straight line.

また、雄ネジ状部５の谷の底を形成する部位１７と、雌ネジ状部７の山の頂（内径を規定する頂）を形成する部位１９と中心軸Ｃ１とが１直線上に０存在している。   Further, a portion 17 that forms the bottom of the valley of the male screw-shaped portion 5, a portion 19 that forms the crest of the female screw-shaped portion 7 (the top that defines the inner diameter), and the central axis C1 are 0 on one straight line. Existing.

上記断面において、中心軸Ｃ１と雌ネジ状部７の谷の底を形成する部位１５と雄ネジ状部５の山の頂を形成する部位１３とが、中空スクリュ３の中心軸Ｃ１から外側に向かってこの順にならんでいる。   In the cross section, the central axis C1, the part 15 forming the bottom of the valley of the female screw-like part 7, and the part 13 forming the top of the male screw-like part 5 are outward from the central axis C1 of the hollow screw 3. It is in this order.

また、上記断面において、中心軸Ｃ１と雌ネジ状部７の山の頂を形成する部位１９と雄ネジ状部５の谷の底を形成する部位１７とが、中空スクリュ３の中心軸Ｃ１から外側に向かってこの順にならんでいる。   Further, in the cross section, the central axis C1, the portion 19 forming the top of the female screw-like portion 7 and the portion 17 forming the bottom of the valley of the male screw-like portion 5 are separated from the central axis C1 of the hollow screw 3. It is in this order toward the outside.

また、円柱状の素材から生成される中空スクリュ３は、図４（ｂ）に示す形状の図形（斜線でハッチングした図形）ものを、中心軸Ｃ１を回転中心にして一定の方向に一定の回転角速度で回転しつつ、図４（ｂ）の紙面に直交する方向に一定の速度で一定の距離だけ移動したときに、図４（ｂ）に示す形状の図形の軌跡で表わされる立体形状に形成されている。   Moreover, the hollow screw 3 produced | generated from a column-shaped raw material carries out constant rotation in the fixed direction centering | focusing on the central axis C1 about the figure (diagram hatched with the oblique line) of the shape shown in FIG.4 (b). Formed in a three-dimensional shape represented by the locus of the figure shown in FIG. 4 (b) when it is rotated at an angular speed and moved at a constant speed in a direction orthogonal to the paper surface of FIG. 4 (b). Has been.

図４（ｂ）に示す形状の図形で最も外側の円は、雄ネジ状部５が形成される前の円柱状の素材２５の外周を示しており、最も外側の円に内接している楕円状のものは、雄ネジ状部５を示しており、内側の楕円状のものは、雌ネジ状部７を示している。   The outermost circle in the figure having the shape shown in FIG. 4B indicates the outer periphery of the columnar material 25 before the male screw-like portion 5 is formed, and is an ellipse inscribed in the outermost circle. The shape indicates the male screw-shaped portion 5, and the inner elliptical shape indicates the female screw-shaped portion 7.

なお、図４（ｂ）に示すハッチングの図形の軌跡であらわされる中空スクリュ３は、２条ネジになるが、必ずしも２条ネジである必要はなく、中空スクリュ３が１条ネジになっていてもよいし、３条ネジ等の多条ネジになっていてもよい。   The hollow screw 3 represented by the hatched locus shown in FIG. 4B is a double thread, but it is not necessarily a double thread, and the hollow screw 3 is a single thread. Alternatively, it may be a multiple thread such as a triple thread.

また、図４等から理解されるように、雄ネジ状部５の螺旋や雌ネジ状部７の螺旋は、中心軸Ｃ１まわりで２回転しているが、必ずしも２回転である必要はなく、１回転以下の回転である等、他の回転角度になっていてもよい。   Further, as understood from FIG. 4 and the like, the spiral of the male screw-shaped portion 5 and the spiral of the female screw-shaped portion 7 are rotated twice around the central axis C1, but are not necessarily required to be rotated twice. The rotation angle may be other rotation angle such as one rotation or less.

さらに、上記説明では、図４（ｂ）の斜線領域で示す中空スクリュ３の断面形状（中心軸Ｃ１に対して直交する平面による断面の形状）が一定の形状になっているが、断面形状が必ずしも一定である必要はなく、断面形状が、中心軸Ｃ１を回転中心にして一定の方向に一定の回転角速度で回転しつつ紙面に直交する方向に一定の速度で移動するにしたがって次第に変化していてもよい。たとえば、図４（ｂ）に示す外側の楕円と内側の楕円との大きさが変化していてもよい。   Furthermore, in the above description, the cross-sectional shape of the hollow screw 3 indicated by the hatched area in FIG. 4B (the cross-sectional shape by a plane orthogonal to the central axis C1) is a constant shape. The cross-sectional shape does not necessarily have to be constant, and gradually changes as it moves at a constant speed in a direction perpendicular to the paper surface while rotating at a constant rotational angular speed in a constant direction around the central axis C1. May be. For example, the size of the outer ellipse and the inner ellipse shown in FIG.

また、中空スクリュ３では、雄ネジ状部５と雌ネジ状部７とが切削加工（研削加工でもよい）によって形成されている。   Further, in the hollow screw 3, the male screw portion 5 and the female screw portion 7 are formed by cutting (or grinding).

たとえば、雄ネジ状部５は、バイトで切削加工されており、雌ネジ状部７は、雄ネジ状部５の形状にあわせて、たとえばサイドカッタ２１（図４（ａ）参照）で切削加工されている。なお、数値制御の工作機械で中空スクリュ３の雄ネジ状部５と雌ネジ状部７とを加工する場合、雄ネジ状部５の加工プログラムを基にしたオフセットデータをベースにした加工プログラムを使用して、雌ネジ状部７が加工される。   For example, the male screw-like portion 5 is cut with a cutting tool, and the female screw-like portion 7 is cut with a side cutter 21 (see FIG. 4A) according to the shape of the male screw-like portion 5, for example. Has been. When machining the male screw part 5 and the female screw part 7 of the hollow screw 3 with a numerically controlled machine tool, a machining program based on offset data based on the machining program for the male screw part 5 is used. In use, the female threaded portion 7 is processed.

また、図４（ａ）では、中空スクリュ３の雌ネジ状部７の長手方向の両端部に小径部２７が形成されているが、小径部２７を削除して雌ネジ状部７だけの形態にしてもよい。   Moreover, in FIG. 4A, although the small diameter part 27 is formed in the both ends of the longitudinal direction of the female screw-shaped part 7 of the hollow screw 3, the small diameter part 27 is deleted and only the female screw-shaped part 7 is formed. It may be.

次に、中空スクリュ組立体１の製造方法について説明する。   Next, a method for manufacturing the hollow screw assembly 1 will be described.

まず、中空スクリュ３を次のようにして製造する。   First, the hollow screw 3 is manufactured as follows.

円柱状の素材２５の側面部（外周部）に雄ネジ状部５を、たとえばバイトを用いた数値制御の加工プログラムで切削加工にて形成する（雄ネジ状部形成工程；図２参照）。螺旋状の雄ネジ状部５の中心軸は、円柱状の素材２５の中心軸Ｃ１と一致している。   The male threaded portion 5 is formed on the side surface (outer peripheral portion) of the columnar material 25 by cutting with a numerically controlled machining program using, for example, a cutting tool (male threaded portion forming step; see FIG. 2). The central axis of the spiral male screw-shaped portion 5 coincides with the central axis C1 of the columnar material 25.

また、前記円柱状の素材の中心軸Ｃ１に沿って円柱状の孔２３を形成する（孔形成工程；図３参照）。雄ネジ状部形成工程と孔形成工程とはこの順序が逆になってもよい。   Further, a cylindrical hole 23 is formed along the central axis C1 of the cylindrical material (hole forming step; see FIG. 3). This order may be reversed between the male threaded portion forming step and the hole forming step.

孔形成工程で形成された孔２３は、たとえばドリルで形成された貫通孔である。この孔２３の痕跡が、小径部２７になる場合もある。円柱状の孔２３の外径（内径）の値は、雄ネジ状部５の谷径の値よりも小さくなっており、円柱状の素材の中心軸Ｃ１と円柱状の孔２３の中心軸とはお互いが一致している。   The hole 23 formed in the hole forming step is a through hole formed by a drill, for example. The trace of the hole 23 may become the small diameter portion 27. The value of the outer diameter (inner diameter) of the cylindrical hole 23 is smaller than the value of the valley diameter of the male screw-shaped portion 5, and the central axis C1 of the cylindrical material and the central axis of the cylindrical hole 23 are Are consistent with each other.

雄ネジ状部形成工程で雄ネジ状部５を形成し、孔形成工程で孔２３を形成した後、孔形成工程で形成した孔２３に沿い、孔２３を広げる態様で、たとえばＴ溝カッタ２１を用いた切削加工によって、雌ネジ状部７を形成する（雌ネジ状部形成工程；図４参照）。   After forming the male screw-like portion 5 in the male screw-like portion forming step, forming the hole 23 in the hole forming step, and extending the hole 23 along the hole 23 formed in the hole forming step, for example, a T-groove cutter 21 The internal thread-like part 7 is formed by cutting using (internal thread-like part forming step; see FIG. 4).

螺旋状の雌ネジ状部７の中心軸は円柱状の素材２５の中心軸Ｃ１と一致している。雌ネジ状部７は、円柱状の素材２５の径方向で、谷の底が雄ネジ状部５の山の頂と一致し、山の頂が雄ネジ状部５の谷の底と一致している。   The central axis of the spiral female screw-like portion 7 coincides with the central axis C 1 of the columnar material 25. The female screw-like portion 7 is the radial direction of the cylindrical material 25, and the bottom of the valley coincides with the top of the mountain of the male screw-like portion 5, and the top of the mountain coincides with the bottom of the valley of the male screw-like portion 5. ing.

中空スクリュ３を複数本生成した後、これらの中空スクリュ３をこの長手方向（中心軸Ｃ１の延伸方向）でお互いに接続する（接続工程；図１参照）。   After a plurality of hollow screws 3 are produced, these hollow screws 3 are connected to each other in this longitudinal direction (the extending direction of the central axis C1) (connection step; see FIG. 1).

接続工程での各中空スクリュ３の接続は、たとえば溶接によってなされる。接続工程での各中空スクリュ３の接続がなされた後、必要に応じて、中空スクリュ組立体１の外周表面を仕上げ加工（たとえば、研削加工）し、続いて、中空スクリュ組立体１の外周表面に溶射等によって薄膜を設ける。   Each hollow screw 3 is connected in the connecting step by welding, for example. After the connection of the hollow screws 3 in the connecting step, the outer peripheral surface of the hollow screw assembly 1 is finished (for example, ground) as necessary, and then the outer peripheral surface of the hollow screw assembly 1 is processed. A thin film is provided by spraying or the like.

この後フェージング処理（溶射被膜と基材との間の密着力を向上させて被膜に内在する空隙を無気孔にする処理）をし、この後、基材（溶射がなされていない中空スクリュ組立体１）に合わせて焼き入れ、焼き戻しを行う。   This is followed by fading treatment (treatment to improve the adhesion between the thermal spray coating and the base material so that the voids in the coating are non-porous), and then the base material (hollow screw assembly not sprayed) In accordance with 1), quenching and tempering are performed.

中空スクリュ組立体１によれば、雄ネジ状部５と雌ネジ状部７との間における肉厚の差が小さくなっている（いずれの部位でも肉厚がほぼ等しくなっているので）、雌ネジ状部７内に冷却水を流した場合、表面（雄ネジ状部５）の温度ムラがほぼなくなり、中空スクリュ組立体１の搬送対象である被成形物に温度ムラが発生することを防ぐことができる。   According to the hollow screw assembly 1, the difference in thickness between the male screw-like portion 5 and the female screw-like portion 7 is small (because the thickness is almost equal in any part), When cooling water is allowed to flow into the screw-like portion 7, the temperature unevenness on the surface (the male screw-like portion 5) is almost eliminated, and temperature unevenness is prevented from occurring in the molding object to be conveyed by the hollow screw assembly 1. be able to.

また、中空スクリュ組立体１によれば、雄ネジ状部５と雌ネジ状部７とが切削加工（機械加工）で形成されているので、製造工程（製造期間）を短縮することができ、しかも、材料選択の自由度が高まる。   Moreover, according to the hollow screw assembly 1, since the male thread part 5 and the female thread part 7 are formed by cutting (machining), the manufacturing process (manufacturing period) can be shortened. Moreover, the degree of freedom in material selection increases.

詳しく説明すると、従来の中空スクリュは、これを製造するとき、鋳鉄等を溶融しこの溶融した材料を中子を備えた型に注湯していた（鋳造によって生成していた）。鋳造では、溶融成形後に冷却や枯らし工程等が必要であり、製造期間が長期にわたってしまう。   More specifically, when a conventional hollow screw is manufactured, cast iron or the like is melted and the molten material is poured into a mold having a core (generated by casting). Casting requires a cooling and drying process after melt molding, and the production period is long.

しかし、中空スクリュ組立体１は、素材を切削加工することで製造できるので、冷却や枯らし工程等が不要になり（場合によっては、製鍛造工程も不要になり）、製造期間を短縮することができる。また、金属材料を溶かした後再結晶させることがないので、鋳造の場合のように特殊な材料を使用する必要がなくなり、材料の選択の自由度が高まる。   However, since the hollow screw assembly 1 can be manufactured by cutting a material, a cooling or withering process or the like is unnecessary (in some cases, a forging process is also unnecessary), and the manufacturing period can be shortened. it can. In addition, since the metal material is not recrystallized after being melted, it is not necessary to use a special material as in the case of casting, and the degree of freedom in selecting the material is increased.

さらに、素材として、様々な種類（たとえば超硬材料）のものを簡単に試すことができる（中空スクリュ組立体１の使用の態様に合致しているか否かを簡単に試すことができる）。   Furthermore, various types of materials (for example, cemented carbide materials) can be easily tested (whether or not they match the mode of use of the hollow screw assembly 1).

また、中空スクリュ組立体１によれば、数値制御の工作機械で中空スクリュ３の雄ネジ状部５と雌ネジ状部７とを加工する場合、雄ネジ状部５の加工プログラムを基にしたオフセットデータをベースにした加工プログラムを使用して、雌ネジ状部７を加工するので、加工プログラムの生成工数を削減することができる。   Further, according to the hollow screw assembly 1, when machining the male screw-like portion 5 and the female screw-like portion 7 of the hollow screw 3 with a numerically controlled machine tool, it is based on the machining program for the male screw-like portion 5. Since the female threaded portion 7 is machined using a machining program based on the offset data, the number of steps for generating the machining program can be reduced.

また、中空スクリュ３をこの長手方向につなぐことで中空スクリュ組立体１が製造できるので、中空スクリュ組立体１の製造に際し、オーバーハング量の小さいサイドカッタ２１を用いて複雑な形状の雌ネジ状部７を切削加工することができ、雌ネジ状部７の形状を正確なものにすることができる。   Further, since the hollow screw assembly 1 can be manufactured by connecting the hollow screws 3 in the longitudinal direction, the side screw 21 having a small overhang is used to manufacture the hollow screw assembly 1 in a complicated shape. The part 7 can be cut and the shape of the female thread-like part 7 can be made accurate.

なお、上記説明では、中空スクリュ組立体１で樹脂等の被成形物を搬送することにしているが、高温で溶融された樹脂を混練や脱気するため等他の用途に、中空スクリュ組立体１を使用してもよい。   In the above description, the hollow screw assembly 1 is used to transport a molded object such as a resin. However, the hollow screw assembly is used for other purposes such as kneading or degassing a resin melted at a high temperature. 1 may be used.

さらに、中空スクリュ３をつなげることなく、１本の中空スクリュ３で中空スクリュ組立体１を構成してもよい。   Further, the hollow screw assembly 1 may be constituted by one hollow screw 3 without connecting the hollow screws 3.

１ 中空スクリュ組立体
３、３Ａ、３Ｂ 中空スクリュ
５ 雄ネジ状部
７ 雌ネジ状部
９ 先端部構成体
１１ 供給パイプ
１３、１５、 部位
１７、１９ 部位
２１ サイドカッタ（Ｔ溝カッタ）
２３ 孔
２５ 本体部（素材）
２７ 小径部
Ｃ１ 中心軸 DESCRIPTION OF SYMBOLS 1 Hollow screw assembly 3, 3A, 3B Hollow screw 5 Male thread-like part 7 Female thread-like part 9 Tip part structure 11 Supply pipe 13, 15, part 17, 19 part 21 Side cutter (T-slot cutter)
23 Hole 25 Body (Material)
27 Small diameter part C1 Center axis

Claims (4)

本体部の外周側面に設けられた雄ネジ状部と、
中心軸が前記本体部の中心軸と一致し、前記本体部の径方向で、谷の底が前記雄ネジ状部の山の頂と一致し、山の頂が前記雄ネジ状部の谷の底と一致するように、前記本体部に設けられた雌ネジ状部と、
を有することを特徴とする中空スクリュ。 A male screw-like portion provided on the outer peripheral side surface of the main body,
The central axis coincides with the central axis of the main body portion, and in the radial direction of the main body portion, the bottom of the valley coincides with the top of the mountain of the male screw-like portion, and the top of the mountain corresponds to the trough of the male screw-like portion. A female threaded portion provided in the main body so as to coincide with the bottom;
A hollow screw characterized by comprising: 請求項１に記載の中空スクリュにおいて、
前記雄ネジ状部と前記雌ネジ状部とは切削加工によって形成されていることを特徴とする中空スクリュ。 The hollow screw according to claim 1,
The hollow screw characterized in that the male screw-like portion and the female screw-like portion are formed by cutting. 素材の側面部に雄ネジ状部を切削加工にて形成する雄ネジ状部形成工程と、
前記素材の中心軸に沿って円柱状の孔を形成する孔形成工程と、
前記雄ネジ状部形成工程で雄ネジ状を形成し、前記孔形成工程で孔を形成した後、前記孔形成工程で形成した孔に沿って、切削加工により、中心軸が前記円柱状の素材の中心軸と一致し、前記円柱状の素材の径方向で、谷の底が前記雄ネジ状部の山の頂と一致し、山の頂が前記雄ネジ状部の谷の底と一致している雌ネジ状部を形成する雌ネジ状部形成工程と、
を有することを特徴とする中空スクリュの製造方法。 A male threaded portion forming step of forming a male threaded portion on the side surface of the material by cutting;
A hole forming step of forming a cylindrical hole along the central axis of the material;
A material in which the center axis is the cylindrical shape by cutting along the hole formed in the hole forming step after forming the male screw shape in the male screw portion forming step and forming the hole in the hole forming step. In the radial direction of the cylindrical material, the bottom of the valley coincides with the top of the mountain of the male screw-like portion, and the top of the mountain coincides with the bottom of the valley of the male screw-like portion. A female threaded portion forming step for forming the female threaded portion,
A process for producing a hollow screw characterized by comprising: 請求項３に記載の中空スクリュの製造方法によって複数の中空スクリュを生成した後、これらの中空スクリュをこの長手方向でお互いに接続する接続工程とを有することを特徴とする中空スクリュ組立体の製造方法。   A hollow screw assembly manufacturing method comprising: a step of connecting a plurality of hollow screws to each other in the longitudinal direction after generating a plurality of hollow screws by the method for manufacturing a hollow screw according to claim 3. Method.
JP2012226584A 2012-10-12 2012-10-12 Hollow screw, hollow screw manufacturing method, and hollow screw assembly manufacturing method Pending JP2014076627A (en)

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