JP2009166133A - Method for manufacturing cylindrical shaft - Google Patents

Method for manufacturing cylindrical shaft Download PDF

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JP2009166133A
JP2009166133A JP2009113306A JP2009113306A JP2009166133A JP 2009166133 A JP2009166133 A JP 2009166133A JP 2009113306 A JP2009113306 A JP 2009113306A JP 2009113306 A JP2009113306 A JP 2009113306A JP 2009166133 A JP2009166133 A JP 2009166133A
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diameter
metal plate
mold
finishing
cylindrical shaft
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Itaru Yanokura
至 矢野倉
Shoichi Akaha
昇一 赤羽
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Seiko Epson Corp
セイコーエプソン株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a cylindrical shaft 20 having high roundness over its whole length by bending work. <P>SOLUTION: In a method for manufacturing the cylindrical shaft 20, a metal sheet 10 is worked into such a shape that each of cross-sectional shapes orthogonal to a longitudinal direction is circular, by press-molding it in the width direction. The method includes: a preliminary step of bending a portion of more than 50% in width of the metal sheet 10 into a circular-arc shape; a pre-finish step of working the metal sheet 10 to the stage where the diameter of the metal sheet 10 of the cross section orthogonal to the longitudinal direction, which diameter is parallel to the mating direction of the dies 50, is shorter than the finish diameter of a shaft product, and where the diameter of the metal sheet 10, which diameter is orthogonal to the mating direction of the dies 50, is longer than the finish diameter of the shaft product by using the pair of dies 50, which approach each other and form the metal sheet 10 fed from the preliminary step into a cylindrical shape; and a finish step of finishing the working at the state that the inner surface of the groove is in contact with the surface of the metal sheet 10, by using a pair of dies 60 having grooves, whose inner surfaces have the shapes of a semi-circle having the same inner diameter as the finish diameter of the shaft product, which extend in the longitudinal direction, and which are used as working surfaces. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、円筒軸の製造方法に関する。より詳細には、金属板を曲げ加工して真円度の高い円筒軸を製造する方法に関する。   The present invention relates to a method for manufacturing a cylindrical shaft. More specifically, the present invention relates to a method of manufacturing a cylindrical shaft having a high roundness by bending a metal plate.

金属板を曲げ加工して円筒状の製品を製造する技術は数多くある。下記の特許文献1には、そのうちでも比較的薄い金属板を曲げて小径の管円筒を製造する技術が開示されている。特許文献1の記載によると、目的とする円筒状製品の内径に略等しい芯ロールと、芯ロールに押しつけられて連れ回る一対の押付ロールと、独特な経路で各ロールにかけ渡された案内ベルトによって、金属板を芯ロールに密着させながら成形することを提案している。また、これにより、樽型変形のない成形が行える旨が記載されている。   There are many techniques for manufacturing cylindrical products by bending metal plates. The following Patent Document 1 discloses a technique for manufacturing a small-diameter tube cylinder by bending a relatively thin metal plate among them. According to the description in Patent Document 1, a core roll that is substantially equal to the inner diameter of the target cylindrical product, a pair of pressing rolls that are pushed around the core roll, and a guide belt that is passed over each roll through a unique path. It is proposed that the metal plate be formed while being in close contact with the core roll. In addition, it is described that molding without barrel deformation can be performed.

特開2003−245721号公報JP 2003-245721 A

しかしながら、加工応力の残留分布による変形、加工により生じた肉厚分布等により、回転軸として使用できるまでの高い真円度を有する長尺円筒軸製品はまだ製造されていない。   However, due to deformation due to residual distribution of processing stress, thickness distribution caused by processing, etc., a long cylindrical shaft product having high roundness until it can be used as a rotating shaft has not been manufactured yet.

上記課題を解決するために、本発明の第1の形態によると、金属板を、金属板の幅方向に曲げるプレス成形により加工して、長手方向に直交する断面形状の各々が円筒形の軸製品を製造する方法であって、長手方向に直交する断面において金属板の幅の50%以上を円弧状に曲げる予備工程と、互いに接近し予備工程上がりの金属板を円筒状に加工する一対の金型を用いて、長手方向に直交する断面における金型の合わせ方向の径が軸製品の仕上がり径よりも長く、金型の合わせ方向と直交する予備工程上がりの金属板の径が軸製品の仕上がり径よりも短い段階で加工を止める仕上げ前工程と、互いに接近し仕上げ前工程上がりの金属板を円筒状に加工する一対の金型であって、前記一対の金型を当接させたときに、長手方向に直交する断面における金型の合わせ方向の径が仕上がり径よりも長く、金型の合わせ方向と直交する径が仕上がり径よりも短い加工面溝を形成する金型を用い、仕上げ前工程上がりの金属板の表面に前記溝の内面が接した状態で加工を終える仕上げ工程とを含む円筒軸の製造方法が提供される。   In order to solve the above-described problem, according to the first embodiment of the present invention, a metal plate is processed by press molding that is bent in the width direction of the metal plate, and each of the cross-sectional shapes orthogonal to the longitudinal direction is a cylindrical shaft. A method for manufacturing a product, comprising a pair of steps of bending a metal plate of 50% or more of the width of a metal plate in an arc shape in a cross-section perpendicular to the longitudinal direction into a circular shape and approaching each other to form a cylindrical metal plate after the preliminary step Using the mold, the diameter of the mold alignment direction in the cross section orthogonal to the longitudinal direction is longer than the finished diameter of the shaft product, and the diameter of the metal plate in the preliminary process orthogonal to the mold alignment direction is A pair of molds that process a metal plate that has been processed into a cylindrical shape close to each other and finished before the finishing process, in which processing is stopped at a stage shorter than the finished diameter, and the pair of molds are brought into contact with each other Cross section perpendicular to the longitudinal direction The surface of the metal plate after the pre-finishing process is finished using a mold that forms a groove on the machining surface where the diameter in the mold alignment direction is longer than the finished diameter and the diameter perpendicular to the mold alignment direction is shorter than the finished diameter. And a finishing step of finishing the processing in a state where the inner surface of the groove is in contact therewith.

また、ひとつの実施形態においては、上記製造方法の仕上げ工程において、金型の合わせ方向の径が軸製品の仕上がり径よりも短く、金型の合わせ方向に直交する径が軸製品の仕上がり径よりも短い金型を用い、金属板のスプリングバックを相殺して仕上げ前工程上がりの長手方向に直交する断面における形状を円筒形に仕上げる。これにより、最終製品における円筒軸の真円率を向上させることができる。   In one embodiment, in the finishing step of the manufacturing method, the diameter of the mold alignment direction is shorter than the finished diameter of the shaft product, and the diameter perpendicular to the mold alignment direction is larger than the finished diameter of the shaft product. A short die is used to cancel the spring back of the metal plate, and the shape in the cross section perpendicular to the longitudinal direction after the finishing process is finished into a cylindrical shape. Thereby, the roundness of the cylindrical shaft in the final product can be improved.

また、他の実施形態においては、上記製造方法の仕上げ工程で用いられる金型において、加工曲面と加工曲面に隣接する面との境界が鋭利な角を有する。これにより、曲げ加工時に加工曲面と加工曲面に隣接する面との境界隙間へ金属板の変形が生じることがなく、円筒軸の表面における真円率が向上される。   In another embodiment, in the mold used in the finishing process of the manufacturing method, the boundary between the processed curved surface and the surface adjacent to the processed curved surface has a sharp angle. Thereby, the deformation of the metal plate does not occur in the boundary gap between the machining curved surface and the surface adjacent to the machining curved surface during bending, and the roundness on the surface of the cylindrical shaft is improved.

なお、上記の発明の概要は、本発明の必要な特徴の全てを列挙したものではなく、これらの特徴群のサブコンビネーションもまた、発明となりうる。   The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

この発明に係る円筒軸20の材料となる金属板10の形状を示す図。The figure which shows the shape of the metal plate 10 used as the material of the cylindrical shaft 20 concerning this invention. 金属板10により形成された円筒軸20の形状を部分的に示す図。The figure which shows partially the shape of the cylindrical axis | shaft 20 formed with the metal plate 10. FIG. 金属板10に対するはじめの曲げ加工で使用する金型30を示す断面図である。3 is a cross-sectional view showing a mold 30 used in the first bending process for a metal plate 10. FIG. 図3に示す金型30で曲げ加工された金属板10の断面形状を示す図である。It is a figure which shows the cross-sectional shape of the metal plate 10 bent by the metal mold | die 30 shown in FIG. 金属板10に対する次の曲げ加工に使用する金型40を示す断面図である。4 is a cross-sectional view showing a mold 40 used for the next bending process on the metal plate 10. FIG. 図5に示す金型40で曲げ加工された金属板10の断面形状を示す図である。It is a figure which shows the cross-sectional shape of the metal plate 10 bent by the metal mold | die 40 shown in FIG. 金属板10に対する最後の曲げ加工に使用する金型50を示す断面図である。4 is a cross-sectional view showing a mold 50 used for the final bending process on the metal plate 10. FIG. 金型50で加工した後の金属板10の形状を示す断面図である。FIG. 3 is a cross-sectional view showing the shape of the metal plate 10 after being processed by a mold 50. 仕上げ工程において使用した金型60のダイ62およびパンチ64の形状を示す断面図である。It is sectional drawing which shows the shape of the die | dye 62 and the punch 64 of the metal mold | die 60 used in the finishing process. 金型60に半完成品の円筒軸20をセットした状態を示す図である。It is a figure which shows the state which set the cylindrical shaft 20 of the semi-finished product to the metal mold | die 60. FIG. 円筒軸20をセットした金型60においてパンチ64をダイ62に当接するまで降下させた状態を示す図である。It is a figure which shows the state which lowered | hung the punch 64 until it contact | abutted to the die | dye 62 in the metal mold | die 60 which set the cylindrical shaft 20. FIG. 仕上げ工程を実施した後に、円筒軸20に加工応力が作用しなくなるまでパンチ64を上昇させた状態を示す図である。It is a figure which shows the state which raised the punch 64 until the processing stress no longer acts on the cylindrical shaft 20, after implementing a finishing process.

以下、発明の実施の形態を通じて本発明を説明するが、以下の実施形態は特許請求の範囲に係る発明を限定するものではなく、また実施形態の中で説明されている特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。   Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the claimed invention, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

図1は、曲げ加工して円筒軸20にする前の金属板10の形状を示す図である。金属板10には、その端部から突出する凸部16が間隔をおいて複数形成されている。また、他方の端部にも、凹18が間隔をおいて複数形成されている。更に凸部16の各々は凹部18の各々と、金属板10の長手方向に対して直交方向の同じ位置に配置されている。   FIG. 1 is a diagram showing the shape of the metal plate 10 before bending into the cylindrical shaft 20. The metal plate 10 is formed with a plurality of convex portions 16 projecting from the end portions at intervals. A plurality of recesses 18 are also formed at the other end portion at intervals. Further, each of the convex portions 16 is disposed at the same position in the direction orthogonal to the longitudinal direction of each of the concave portions 18 and the metal plate 10.

図2は、上記のような金属板10を、後述する加工により円筒軸20としたものを部分的に拡大して示す図である。同図に示すように、円筒軸20に成形された状態では、これら凸部16および凹部18が嵌合して、接合部が開くことを防止している。従って、この円筒軸20は、溶接、接着等の工程なしに、そのまま軸製品として利用できる。   FIG. 2 is a partially enlarged view of the metal plate 10 having the cylindrical shaft 20 formed by processing described later. As shown in the figure, in a state where the cylindrical shaft 20 is molded, the convex portion 16 and the concave portion 18 are fitted to prevent the joint portion from being opened. Therefore, the cylindrical shaft 20 can be used as a shaft product as it is without any steps such as welding and bonding.

図3は、上記金属板10に対するはじめの曲げ加工に使用する金型30の形状を示す。同図に示すように、金型30は、互いに相補的な形状の加工面31、33を有するダイ32とパンチ34とを備えている。ダイ32およびパンチ34の加工面は、中央付近が平坦である一方、両端部は約90度の円弧状断面形状を有する。   FIG. 3 shows the shape of a mold 30 used for the first bending process on the metal plate 10. As shown in the figure, the mold 30 includes a die 32 having processing surfaces 31 and 33 having complementary shapes and a punch 34. The processed surfaces of the die 32 and the punch 34 are flat near the center, while both ends have an arcuate cross-sectional shape of approximately 90 degrees.

また、この金型30は、上記の断面形状を保ったまま、紙面の奥行き方向に延在している。更に、このダイ32およびパンチ34の加工面は、金属板10の一方の端部12に形成された凸部16の先端から他方の端部14までの長さと同じ長さを有している。以上のような構造の金型30に対して、前記金属板10は、その長手方向が図面の奥行き方向と一致するように挿入される。   Further, the mold 30 extends in the depth direction of the paper surface while maintaining the above-described cross-sectional shape. Further, the processed surfaces of the die 32 and the punch 34 have the same length as the length from the tip end of the convex portion 16 formed at one end portion 12 of the metal plate 10 to the other end portion 14. The metal plate 10 is inserted into the mold 30 having the above structure so that the longitudinal direction thereof coincides with the depth direction of the drawing.

図4は、図3に示す金型30で曲げ加工された金属板10の断面形状を示す図である。同図に示すように、金属板10の短辺方向の両端は曲げ加工を受け、内角が約90°の円弧状断面を有する被曲げ加工部22、24を形成している。   FIG. 4 is a diagram showing a cross-sectional shape of the metal plate 10 bent by the mold 30 shown in FIG. As shown in the figure, both ends in the short side direction of the metal plate 10 are bent to form bent portions 22 and 24 having arc-shaped cross sections having an inner angle of about 90 °.

図5は、図4に示した金属板10に対する次の曲げ加工に使用する金型40の形状を示す図である。同図に示すように、この金型40は、ダイ42とパンチ44とを備えている。ここで、ダイ42は、円弧状の断面を有し、上方に向かって開いた加工面41を備えている。これに対して、パンチ44は、円弧状の断面を有する加工面43を下端に備えている。更に、加工面43の上方には、曲げ加工によって上昇した金属板10の端部14、12を避けるために、加工面43よりも幅の狭い逃げが形成されている。   FIG. 5 is a view showing the shape of a mold 40 used for the next bending process for the metal plate 10 shown in FIG. As shown in the figure, the mold 40 includes a die 42 and a punch 44. Here, the die 42 has a processing surface 41 having an arc-shaped cross section and opened upward. On the other hand, the punch 44 has a processed surface 43 having an arc-shaped cross section at the lower end. Furthermore, a clearance narrower than the processing surface 43 is formed above the processing surface 43 in order to avoid the end portions 14 and 12 of the metal plate 10 raised by bending.

図6は、図5に示した金型40で曲げ加工された金属板10の断面形状を示す図である。同図に示すように、金属板10は、その端部14から凸部16の先端までの中央が、金型40の加工面41、43の中心と一致するように装入されて曲げ加工されている。   FIG. 6 is a view showing a cross-sectional shape of the metal plate 10 bent by the mold 40 shown in FIG. As shown in the figure, the metal plate 10 is inserted and bent so that the center from the end portion 14 to the tip of the convex portion 16 coincides with the centers of the processing surfaces 41 and 43 of the mold 40. ing.

また、金型30により円弧状に曲げ加工された被曲げ加工部22、24に加え、やはり円弧状に曲げ加工された新規な被曲げ加工部26が形成されている。一方、被曲げ加工部22および被曲げ加工部26の間並びに被曲げ加工部24および被曲げ加工部26の間には、それぞれ、非曲げ加工部21、23が残っている。   Further, in addition to the bent portions 22 and 24 bent into an arc shape by the mold 30, a new bent portion 26 which is also bent into an arc shape is formed. On the other hand, unbent portions 21 and 23 remain between the bent portion 22 and the bent portion 26 and between the bent portion 24 and the bent portion 26, respectively.

図7は、図6に示した形状の金属板10に対する仕上げ前工程で使用する金型50に装着されたダイ52およびパンチ54の形状を示す断面図である。同図に示すように、この金型50は、ダイ52およびパンチ54に加えて、芯型56を含んで形成されている。ダイ52は、その上面から僅かに持ち上げられて形成された、円弧状断面形状を有する加工面51を備えている。これに対して、パンチ54は、その下端面から上方に退避した位置に、やはり円弧状断面形状を有する加工面53を備えている。   FIG. 7 is a cross-sectional view showing the shapes of the die 52 and the punch 54 attached to the mold 50 used in the pre-finishing process for the metal plate 10 having the shape shown in FIG. As shown in the figure, the mold 50 includes a core mold 56 in addition to a die 52 and a punch 54. The die 52 includes a machining surface 51 having an arcuate cross-sectional shape formed by being slightly lifted from the upper surface thereof. On the other hand, the punch 54 includes a machining surface 53 having an arcuate cross-sectional shape at a position retracted upward from the lower end surface thereof.

また、加工面51の外側の側部と、パンチ54の加工面53以外の先端部とは、互いに相補的な形状をしており、パンチ54を降下させたときに、両者が衝突しないようになされている。なお、芯型56は、後述するように、最終的に得られる円筒軸20の内径よりも僅かに小さな外径を有する丸棒であり、金型40において曲げ加工された金属板10の内側にセットされる。   Further, the outer side portion of the processing surface 51 and the tip portion of the punch 54 other than the processing surface 53 are complementary to each other so that they do not collide when the punch 54 is lowered. Has been made. As will be described later, the core die 56 is a round bar having an outer diameter slightly smaller than the inner diameter of the finally obtained cylindrical shaft 20, and is disposed inside the metal plate 10 bent in the mold 40. Set.

上記のような金型50に対して、金型40ですでに曲げ加工された金属板10は、まず、被曲げ加工部26の外側が加工面51の内部に当接するように、ダイ52に装入される。次に、金属板10の内部に、芯型56が置かれる。続いて、パンチ54を降下させると、金属板10の端部14および凸部16を含む端部12が互いに近づき、やがて、凸部16が凹部18に嵌入する。更に、パンチ54を圧下すると、凸部16および凹部18を含む端部12、14の近傍は、パンチ54の加工面53と芯型56との間で、全体で円弧をなすように成形される。   The metal plate 10 that has already been bent by the mold 40 with respect to the mold 50 as described above is first placed on the die 52 so that the outside of the bent portion 26 contacts the inside of the processing surface 51. It is inserted. Next, the core die 56 is placed inside the metal plate 10. Subsequently, when the punch 54 is lowered, the end portion 14 of the metal plate 10 and the end portion 12 including the convex portion 16 approach each other, and eventually the convex portion 16 is fitted into the concave portion 18. Further, when the punch 54 is squeezed, the vicinity of the end portions 12 and 14 including the convex portion 16 and the concave portion 18 is formed so as to form an arc as a whole between the processing surface 53 of the punch 54 and the core die 56. .

同時に、芯型56の下側では、芯型56とダイ52の加工面51との間で、非曲げ加工部21、23を含む金属板10が曲げ加工される。従って、金型50による曲げ加工で、金属板10は、全体で環状の断面を有する円筒となる。   At the same time, below the core die 56, the metal plate 10 including the non-bending portions 21 and 23 is bent between the core die 56 and the processing surface 51 of the die 52. Therefore, the metal plate 10 becomes a cylinder having an annular cross section as a whole by bending with the mold 50.

図8は、上記仕上げ前工程における、金型50による金属板10の加工結果を示す図である。同図に示すように、本実施例では、金属板10の合わせ目28が完全に閉じ切る前に加工を止めている。このため、この円筒軸20の断面形状は、水平方向の径よりも垂直方向の径が大きい。また、水平方向の径は、最終的な軸製品の径よりも短く、垂直方向の径は、最終的な軸製品の径よりも長い。   FIG. 8 is a diagram showing a processing result of the metal plate 10 by the mold 50 in the pre-finishing step. As shown in the figure, in this embodiment, the processing is stopped before the joint 28 of the metal plate 10 is completely closed. For this reason, the cross-sectional shape of this cylindrical shaft 20 is larger in the vertical direction than in the horizontal direction. Moreover, the diameter in the horizontal direction is shorter than the diameter of the final shaft product, and the diameter in the vertical direction is longer than the diameter of the final shaft product.

図9は、本実施例の仕上げ工程において使用する金型60の構造を示す断面図であり、軸製品の長手方向に直交する断面における、パンチ64、ダイ62および芯型56の形状を示す。同図に示すように、ここで用いるパンチ64およびダイ62は、加工面61、63の外側に平坦な面を有する。また、各加工面61、63と平坦な面の境界は鋭利な角部を形成している。従って、パンチ64を圧下し切ったときに、平坦面どうしが密着すると共に、加工面61、63は隙間なく閉じた面を形成する。なお、仕上げ工程では、材料のスプリングバックを考慮して若干過剰に加工するので、パンチ64およびダイ62が当接したときに、加工面61、63は、軸製品の仕上がり寸法よりも水平方向に長く垂直方向に短い内径を有する。   FIG. 9 is a cross-sectional view showing the structure of the mold 60 used in the finishing process of the present embodiment, and shows the shapes of the punch 64, the die 62, and the core mold 56 in a cross section orthogonal to the longitudinal direction of the shaft product. As shown in the figure, the punch 64 and the die 62 used here have a flat surface outside the processing surfaces 61 and 63. Further, the boundaries between the processed surfaces 61 and 63 and the flat surface form sharp corners. Therefore, when the punch 64 is completely squeezed down, the flat surfaces are brought into close contact with each other, and the processed surfaces 61 and 63 form a closed surface without a gap. In the finishing process, the material is processed slightly excessively in consideration of the spring back of the material. Therefore, when the punch 64 and the die 62 come into contact with each other, the processed surfaces 61 and 63 are in a horizontal direction with respect to the finished dimension of the shaft product. Long and short inside diameter.

図10は、図9に示す金型60に、図8に示した仕上げ前工程後の円筒軸20をセットした状態を説明する図である。同図に示すように、この段階では、円筒軸20の径は垂直方向に長く、パンチ64およびダイ62の加工面63、61の最奥部に最初に接触する。   FIG. 10 is a view for explaining a state in which the cylindrical shaft 20 after the pre-finishing process shown in FIG. 8 is set in the mold 60 shown in FIG. As shown in the figure, at this stage, the diameter of the cylindrical shaft 20 is long in the vertical direction, and first comes into contact with the punch 64 and the innermost portions of the processed surfaces 63 and 61 of the die 62.

図11は、図10に示したようにセットした金型60においてパンチ64を降下させ、仕上げ工程を実施している状態を示す。同図に示すように、パンチ64が降下し切って、パンチ64およびダイ62が相互に当接したとき、円筒軸20は、水平方向の径が垂直方向の径よりも長くなるまで変形されている。   FIG. 11 shows a state where the punch 64 is lowered in the mold 60 set as shown in FIG. 10 and the finishing process is performed. As shown in the figure, when the punch 64 is lowered and the punch 64 and the die 62 come into contact with each other, the cylindrical shaft 20 is deformed until the horizontal diameter becomes longer than the vertical diameter. Yes.

図12は、金型60において、円筒軸20に加工応力が作用しなくなるまでパンチ64を上昇させた状態を示す図である。同図に示すように、円筒軸20は自身のスプリングバックにより正円の断面形状を形成している。   FIG. 12 is a view showing a state in which the punch 64 is raised in the mold 60 until the machining stress does not act on the cylindrical shaft 20. As shown in the figure, the cylindrical shaft 20 forms a circular cross-sectional shape by its own spring back.

上記のような一連の工程により、厚さ0.5mmの亜鉛めっき鋼板を用いて、長さ300mm、外径5mmの円筒軸20を作製した。金型50では高精度な真円度を実現させ難いので、金型50を用いた加工は円筒軸20に部分的な膨らみが生じない範囲に止めた。従って、この段階では円筒軸20は完全に閉じ切らない。続いて、金型60を用いて仕上げ工程を実施したところ、局部的な膨らみが生じることなく、真円度の高い円筒軸20を作製できた。また、この円筒軸20は反りも少なく、真直性も高かった。これにより、仕上げ工程の導入が正確な形状の円筒軸20製造に寄与することが確認された。   Through a series of steps as described above, a cylindrical shaft 20 having a length of 300 mm and an outer diameter of 5 mm was produced using a galvanized steel sheet having a thickness of 0.5 mm. Since it is difficult to achieve high-precision roundness with the mold 50, the processing using the mold 50 is limited to a range in which the cylindrical shaft 20 does not partially bulge. Accordingly, at this stage, the cylindrical shaft 20 is not completely closed. Subsequently, when the finishing process was performed using the mold 60, the cylindrical shaft 20 having high roundness could be produced without causing local bulge. In addition, the cylindrical shaft 20 had little warpage and high straightness. Thereby, it was confirmed that introduction of a finishing process contributes to the cylindrical shaft 20 manufacture of the exact shape.

以上詳細に説明した通り、仕上げ加工工程を加えることにより、金属板10を曲げ加工して製造した中空の円筒軸20でありながら、高い真円度と直線性を有するものが製造できる。この円筒軸20は、中実な金属製丸棒材に代替して使用することができる。従って、部品精度の限界から削り出しの丸棒材を使用せざるを得なかった多くの用途において材料コストを低減させることができる。また、この円筒軸20は中実材よりも軽量なので、これを用いることにより、機器の重量はもちろん、動作時のフリクションロスも低減させることができる。   As described in detail above, by adding a finishing process, it is possible to manufacture a hollow cylindrical shaft 20 manufactured by bending the metal plate 10 and having high roundness and linearity. The cylindrical shaft 20 can be used in place of a solid metal round bar. Accordingly, the material cost can be reduced in many applications in which a machined round bar has to be used due to the limit of component accuracy. Further, since the cylindrical shaft 20 is lighter than the solid material, it is possible to reduce the friction loss during operation as well as the weight of the device by using this.

以上、本発明を実施の形態を用いて説明したが、本発明の技術的範囲は上記実施の形態に記載の範囲には限定されない。上記実施の形態に、多様な変更または改良を加え得ることが当業者に明らかである。その様な変更または改良を加えた形態も本発明の技術的範囲に含まれ得ることが、特許請求の範囲の記載から明らかである。   As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

10…金属板、12,14…端部、16…凸部、18…凹部、20…円筒軸、21,23…非曲げ加工部、22,24,26…被曲げ加工部、28…合わせ目、30,40,50,60…金型、32,42,52,62…ダイ、31,33,41,43,51,53,61,63…加工面、34,44,54,64…パンチ、56…芯型。   DESCRIPTION OF SYMBOLS 10 ... Metal plate, 12, 14 ... End part, 16 ... Convex part, 18 ... Concave part, 20 ... Cylindrical shaft, 21, 23 ... Non-bending part, 22, 24, 26 ... Bending part, 28 ... Joint , 30, 40, 50, 60 ... mold, 32, 42, 52, 62 ... die, 31, 33, 41, 43, 51, 53, 61, 63 ... machining surface, 34, 44, 54, 64 ... punch 56 ... Core type.

Claims (4)

金属板を、幅方向に曲げるプレス成形により加工して、長手方向に直交する断面の各々の形状が円筒形の軸製品を製造する方法であって、
長手方向に直交する断面において金属板の幅の50%以上を円弧状に曲げる予備工程と、
互いに接近し予備工程上がりの金属板を円筒状に加工する一対の金型を用いて、長手方向に直交する断面における金型の合わせ方向の径が円筒形の軸製品の仕上がり径よりも短く、金型の合わせ方向と直交する予備工程上がりの金属板の径が仕上がり径よりも長い段階で加工を止める仕上げ前工程と、
互いに接近し仕上げ前工程上がりの金属板を円筒状に加工する一対の金型であって、前記一対の金型を当接させたときに、長手方向に直交する断面における金型の合わせ方向の径が仕上がり径よりも長く、金型の合わせ方向と直交する径が仕上がり径よりも短い加工面溝を形成する金型を用い、仕上げ前工程上がりの金属板の表面に前記溝の内面が接した状態で加工を終える仕上げ工程と
を含む円筒軸の製造方法。
A metal plate is processed by press molding that bends in the width direction, and each of the cross-sections perpendicular to the longitudinal direction has a method of manufacturing a cylindrical shaft product,
A preliminary step of bending 50% or more of the width of the metal plate into an arc shape in a cross section perpendicular to the longitudinal direction;
Using a pair of dies that process the metal plates that are close to each other and are processed in a preliminary process into a cylindrical shape, the diameter in the direction of alignment of the dies in the cross section perpendicular to the longitudinal direction is shorter than the finished diameter of the cylindrical shaft product, A pre-finishing process that stops processing at a stage where the diameter of the metal plate in the preliminary process that is orthogonal to the mold alignment direction is longer than the finished diameter,
A pair of molds that process a metal plate that is close to each other and finishes the pre-finishing process into a cylindrical shape, and when the pair of molds are brought into contact with each other, Using a die that forms a groove on the machined surface that has a diameter longer than the finished diameter and perpendicular to the mating direction of the mold and shorter than the finished diameter, the inner surface of the groove is in contact with the surface of the metal plate that has been finished before the finishing process. A finishing method for finishing machining in a finished state.
仕上げ工程において、金型の合わせ方向の径が円筒形の軸製品の仕上がり径よりも長く、金型の合わせ方向に直交する径が円筒形の軸製品の仕上がり径よりも短い加工面を形成する金型を用い、前記金属板のスプリングバックを相殺して仕上げ前工程上がりの金属板の長手方向に直交する断面における形状を円筒形に仕上げる請求項1に記載の円筒軸の製造方法。   In the finishing process, a machining surface is formed in which the diameter of the mold alignment direction is longer than the finished diameter of the cylindrical shaft product and the diameter perpendicular to the mold alignment direction is shorter than the finished diameter of the cylindrical shaft product. The method for producing a cylindrical shaft according to claim 1, wherein a mold is used to cancel the spring back of the metal plate to finish the shape in a cross section perpendicular to the longitudinal direction of the metal plate after the finishing process into a cylindrical shape. 仕上げ工程で用いられる前記金型において、加工曲面と加工曲面に隣接する面との境界が鋭利な角をなす請求項1または請求項2に記載の円筒軸の製造方法。   3. The method for manufacturing a cylindrical shaft according to claim 1, wherein, in the mold used in the finishing process, a boundary between the machining curved surface and a surface adjacent to the machining curved surface forms a sharp angle. 仕上げ工程において、前記金型の加工曲面の縁部が相互に密着する請求項1または請求項2に記載の円筒軸の製造方法。   The manufacturing method of the cylindrical shaft of Claim 1 or Claim 2 in which a edge part of the process curved surface of the said metal mold | die closely_contact | adheres in a finishing process.
JP2009113306A 2009-05-08 2009-05-08 Method for manufacturing cylindrical shaft Withdrawn JP2009166133A (en)

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