JP5053399B2 - Rolling dies - Google Patents
Rolling dies Download PDFInfo
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- JP5053399B2 JP5053399B2 JP2010036061A JP2010036061A JP5053399B2 JP 5053399 B2 JP5053399 B2 JP 5053399B2 JP 2010036061 A JP2010036061 A JP 2010036061A JP 2010036061 A JP2010036061 A JP 2010036061A JP 5053399 B2 JP5053399 B2 JP 5053399B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/12—Making helical bodies or bodies having parts of helical shape articles with helicoidal surface
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H5/00—Making gear wheels, racks, spline shafts or worms
- B21H5/02—Making gear wheels, racks, spline shafts or worms with cylindrical outline, e.g. by means of die rolls
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Metal Rolling (AREA)
- Forging (AREA)
Description
本発明は、転造ダイスに関するものである。 The present invention relates to a rolling die.
従来から、略円筒形状の被転造部材（ワーク）を挟み込んで回転させながら圧力を加えることで、ウォームやねじの歯形（ねじ山）を塑性加工する転造平ダイス（食付き部、仕上げ部及び逃げ部が連続して形成される）、その他の転造ダイスが提案されている（例えば特許文献１参照）。 Conventionally, a rolling flat die (corrugated part, finished part) that plastically processes tooth shapes (threads) of worms and screws by applying pressure while sandwiching and rotating a substantially cylindrical rolled part (workpiece) In addition, other rolling dies have been proposed (see, for example, Patent Document 1).
ところで、転造品の歯面粗さは、動作音、相手部品の摩耗による寿命や消費電力等に影響を与えるため、当然ながら可及的に小さい（滑らかである）ことが好ましい。また、一般に、ウォーム部やねじ部とそれらが形成されていない略円筒部との境界部分には、正規の歯形（ねじ山）が形成されている部分と歯形やピッチが異なる所謂不完全ねじ（歯形）部が存在するものがあるが、この部分においても同様に歯面粗さが可及的に小さい（滑らかである）ことが好ましい。しかしながら、滑らかとならず転造加工時において、傷やバリ等が生じる場合がある。 By the way, since the tooth surface roughness of the rolled product affects the operating sound, the life and power consumption due to wear of the counterpart component, it is naturally preferable that the tooth surface roughness be as small as possible (smooth). In general, a boundary portion between the worm portion or the screw portion and the substantially cylindrical portion where they are not formed is a so-called incomplete screw (which has a different tooth shape or pitch from a portion where a regular tooth shape (thread) is formed. There is a portion having a (tooth profile) portion, but it is also preferable that the tooth surface roughness is as small as possible (smooth) in this portion as well. However, it may not be smooth, and scratches and burrs may occur during the rolling process.
例えば、予めねじ切り加工や荒転造加工等の予備加工により、歯形がある程度形成された予備加工済みワークに仕上げ加工を施す所謂仕上げ転造の場合、通常つぶし量（押し込んでいく量）は、バニシング効果を得る（表面を滑らかにする）ことが目的であるため、数μｍ程度である。しかしながら、転造加工中に生じるワークの軸方向への移動（歩み）や機械剛性の影響を受け、ダイスの側端部に設けられる面取り部のエッジ（歯先の角部）がワークに食い込み、ワークの端部において歯面に傷が生じることがある。 For example, in the case of so-called finish rolling in which a pre-worked workpiece with a tooth profile formed to some extent by pre-processing such as thread cutting or rough rolling is pre-processed, the normal crushing amount (the amount to push in) is burnishing Since the purpose is to obtain an effect (smooth the surface), it is about several μm. However, under the influence of the movement of the workpiece in the axial direction (step) and machine rigidity that occurs during rolling processing, the edge of the chamfered portion (the corner of the tooth tip) provided at the side end of the die bites into the workpiece, The tooth surface may be damaged at the end of the workpiece.
また、上記予備加工を施さない無垢のワークに直接歯形を形成する所謂無垢転造の場合、食付き部での加工により、ワークの両端部で軸方向の伸びが発生し、転造加工中に一旦はダイスの転造歯型に干渉しない状態となる。その後このワークの端部は、歩みの関係で仕上げ部において再びダイスに挟み込まれるが、伸びが発生した端部ではピッチ及び歯厚がダイスの転造歯型に合わないため、バリや振れが生じることがある。 Also, in the case of so-called solid rolling, in which the tooth profile is formed directly on the solid workpiece that is not subjected to the preliminary processing, the elongation at the both ends of the workpiece occurs due to the processing at the chamfered portion, and during the rolling processing Once, it will be in the state which does not interfere with the rolling tooth type of a die. After that, the end of this work is sandwiched again in the finished part due to the step, but at the end where the elongation occurs, the pitch and the tooth thickness do not match the rolling die of the die, so burrs and runout occur. Sometimes.
本発明は、上述のような問題点を解決したもので、被転造部材とダイスの転造歯型との干渉を可及的に抑制して被転造部材の歯面に傷やバリ等が生じることを防止できる極めて実用性に秀れた転造ダイスを提供するものである。 The present invention solves the above-mentioned problems, and suppresses interference between the rolled member and the rolling tooth mold of the die as much as possible, and scratches, burrs, etc. on the tooth surface of the rolled member. It is an object of the present invention to provide a rolling die excellent in practicality that can prevent the occurrence of the above.
添付図面を参照して本発明の要旨を説明する。 The gist of the present invention will be described with reference to the accompanying drawings.
被転造部材１の外周面に転造歯型２を当接させることで該外周面を塑性変形させウォーム若しくはねじの歯形を転造する転造ダイスであって、前記転造歯型２の少なくとも一側端部には、各歯部３の歯厚Ｔが所定の高さ位置において中央部に比し薄く形成され前記被転造部材１との干渉を緩和する干渉緩和部Ｒが設けられており、この干渉緩和部Ｒは、前記転造歯型２の各歯部３間の歯溝５の形状を略同一形状とし、前記転造歯型２の歯底６の側端部位８を外方に向かって所定角度で下り傾斜させることで構成され、前記歯底６の側端部位８の傾斜角度は、前記転造ダイスの基準面若しくは基準線と平行な直線に対し０°より大きく６０°以内の角度に設定されており、また、前記転造歯型２の少なくとも一側端部の各歯部３は、前記転造ダイスの基準面若しくは基準線と平行な直線に対し２０〜６０°の面取り角で面取りされていることを特徴とする転造ダイスに係るものである。 A rolling die for rolling a tooth shape of a worm or a screw by plastically deforming the outer peripheral surface by bringing a rolling tooth die 2 into contact with the outer peripheral surface of the member 1 to be rolled. At least one side end portion is provided with an interference mitigation portion R that reduces the tooth thickness T of each tooth portion 3 at a predetermined height as compared with the central portion and mitigates interference with the rolled member 1. The interference mitigating portion R has substantially the same shape of the tooth gap 5 between the tooth portions 3 of the rolling tooth mold 2 and the side end portion 8 of the tooth bottom 6 of the rolling tooth mold 2 is formed. It is configured by inclining downward at a predetermined angle toward the outside, and the inclination angle of the side end portion 8 of the root 6 is greater than 0 ° with respect to a reference plane of the rolling die or a straight line parallel to the reference line. An angle of 60 ° or less is set, and each tooth portion 3 at least one side end portion of the rolling tooth mold 2 is formed by the rolling die. The present invention relates to a rolling die characterized in that it is chamfered at a chamfering angle of 20 to 60 ° with respect to a reference plane of the steel or a straight line parallel to the reference line .
また、請求項１記載の転造ダイスにおいて、前記歯底６の側端部位８の傾斜角度は、前記面取り角と同一若しくは該面取り角より大きな角度で、且つ、前記転造ダイスの基準面若しくは基準線と平行な直線に対し６０°以内の角度に設定されていることを特徴とする転造ダイスに係るものである。 The rolling die according to claim 1 , wherein an inclination angle of the side end portion 8 of the tooth bottom 6 is equal to or larger than the chamfering angle, and a reference surface of the rolling die or The present invention relates to a rolling die characterized by being set at an angle of 60 ° or less with respect to a straight line parallel to the reference line.
また、被転造部材１の外周面に転造歯型２を当接させることで該外周面を塑性変形させウォーム若しくはねじの歯形を転造する転造ダイスであって、前記転造歯型２の少なくとも一側端部には、各歯部３の歯厚Ｔが所定の高さ位置において中央部に比し薄く形成され前記被転造部材１との干渉を緩和する干渉緩和部Ｒが設けられており、この干渉緩和部Ｒは、前記転造歯型２の側端部における各歯部３間の歯溝５の形状を、転造方向に直交する断面視において、中央部の歯溝５の形状をこの転造方向に直交する方向に平行移動して得られる軌跡と略同一形状とすることで構成され、また、前記転造歯型２の少なくとも一側端部の各歯部３は、前記転造ダイスの基準面若しくは基準線と平行な直線に対し２０〜６０°の面取り角で面取りされていることを特徴とする転造ダイスに係るものである。 A rolling die for rolling a worm or screw tooth profile by plastically deforming the outer peripheral surface by bringing a rolling tooth mold 2 into contact with the outer peripheral surface of the rolled member 1, wherein the rolling tooth mold At least one side end portion of 2 is formed with an interference mitigation portion R in which the tooth thickness T of each tooth portion 3 is formed thinner than the central portion at a predetermined height position and mitigates interference with the rolled member 1. The interference mitigating portion R is provided so that the shape of the tooth gap 5 between the tooth portions 3 at the side end portion of the rolling tooth mold 2 is the tooth at the center in a cross-sectional view orthogonal to the rolling direction. is constructed by the trajectory substantially the same shape obtained by translating in a direction perpendicular to the shape of the groove 5 in the rolling direction, each tooth of at least one end of the rolling tooth type 2 3 is chamfered at a chamfering angle of 20 to 60 ° with respect to the reference surface of the rolling die or a straight line parallel to the reference line. Those of the rolling die, wherein the that.
また、請求項１〜３いずれか１項に記載の転造ダイスにおいて、この転造ダイスは、転造方向始端側から順に食付き部Ａ、仕上げ部Ｂ及び逃げ部Ｃが連続して形成される平ダイスＸであり、前記干渉緩和部Ｒは、少なくとも前記仕上げ部Ｂと逃げ部Ｃとに設けられていることを特徴とする転造ダイスに係るものである。 Further, in the rolling die according to any one of claims 1 to 3, in the rolling die, a biting part A, a finishing part B, and a relief part C are successively formed in order from the rolling direction start end side. The interference easing part R relates to a rolling die characterized by being provided at least in the finishing part B and the relief part C.
また、請求項１〜３いずれか１項に記載の転造ダイスにおいて、この転造ダイスは、丸ダイスＹであり、前記干渉緩和部Ｒは、丸ダイスＹの全周に渡って設けられていることを特徴とする転造ダイスに係るものである。 Further, in the rolling die according to any one of claims 1 to 3 , the rolling die is a round die Y, and the interference mitigation portion R is provided over the entire circumference of the round die Y. The present invention relates to a rolling die characterized by
また、請求項１〜３いずれか１項に記載の転造ダイスにおいて、この転造ダイスは、転造方向始端側から順に食付き部Ａ、仕上げ部Ｂ及び逃げ部Ｃが連続して形成される欠円ダイスＱであり、前記干渉緩和部Ｒは、少なくとも前記仕上げ部Ｂと逃げ部Ｃとに設けられていることを特徴とする転造ダイスに係るものである。 Further, in the rolling die according to any one of claims 1 to 3, in the rolling die, a biting part A, a finishing part B, and a relief part C are successively formed in order from the rolling direction start end side. And the interference mitigation part R relates to a rolling die characterized by being provided at least in the finishing part B and the relief part C.
また、請求項１〜６いずれか１項に記載の転造ダイスにおいて、前記干渉緩和部Ｒは、前記転造歯型２の両側端部に夫々設けられていることを特徴とする転造ダイスに係るものである。 The rolling die according to any one of claims 1 to 6 , wherein the interference mitigation portion R is provided at each of both end portions of the rolling tooth die 2. It is related to.
また、請求項１〜７いずれか１項に記載の転造ダイスにおいて、前記歯溝５は、歯底側に向かうほどその幅が小さくなる断面視略台形状若しくは断面視略三角形状であることを特徴とする転造ダイスに係るものである。 Further, in the rolling die according to any one of claims 1 to 7, the tooth gap 5 has a substantially trapezoidal shape in a cross-sectional view or a substantially triangular shape in a cross-sectional view as its width decreases toward the tooth bottom side. The present invention relates to a rolling die characterized by
また、請求項１〜８いずれか１項に記載の転造ダイスにおいて、前記歯部３は、歯先側に向かうほどその幅が小さくなる断面視略台形状若しくは断面視略三角形状であることを特徴とする転造ダイスに係るものである。 Moreover, the rolling die of any one of Claims 1-8 WHEREIN: The said tooth | gear part 3 is cross-sectional view substantially trapezoid shape or cross-sectional view substantially triangular shape as the width | variety becomes small as it goes to a tooth tip side. The present invention relates to a rolling die characterized by
本発明は上述のように構成したから、被転造部材とダイスの転造歯型との干渉を可及的に抑制して被転造部材の歯面に傷やバリ等が生じることを防止できる極めて実用性に秀れた転造ダイスとなる。 Since the present invention is configured as described above, the interference between the rolled member and the rolling tooth mold of the die is suppressed as much as possible to prevent the tooth surface of the rolled member from being scratched or burred. It can be a rolling die with excellent practicality.
好適と考える本発明の実施形態を、図面に基づいて本発明の作用を示して簡単に説明する。 An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.
一対の転造ダイスにより被転造部材１を挟み込んで転造加工を行う際、転造歯型２にして歯厚Ｔが薄い側端部の歯部３と、被転造部材１の当該歯部３と噛み合う部位との間に隙間Ｇが生じ、転造歯型２の側端部と被転造部材１との干渉が緩和される。よって、仕上げ転造の場合には被転造部材１の歯面に傷が生じることを防止でき、また、無垢転造の場合には被転造部材１の端部にバリが生じることを防止でき、更に被転造部材１の振れも抑制できることになる。 When the rolling member 1 is sandwiched by a pair of rolling dies and the rolling process is performed, the teeth 3 of the side end portion of the rolling tooth die 2 having a thin tooth thickness T and the teeth of the rolled member 1 are provided. A gap G is generated between the portion 3 and the portion that meshes with the portion 3, and interference between the side end portion of the rolling tooth mold 2 and the member 1 to be rolled is alleviated. Therefore, in the case of finish rolling, it is possible to prevent the tooth surface of the rolled member 1 from being damaged, and in the case of solid rolling, it is possible to prevent the occurrence of burrs at the end of the rolled member 1. In addition, the runout of the rolled member 1 can be suppressed.
本発明の具体的な実施例について図面に基づいて説明する。 Specific embodiments of the present invention will be described with reference to the drawings.
本実施例は、被転造部材１の外周面に転造歯型２を当接させることで該外周面を塑性変形させ所望の歯形を転造する転造ダイスであって、前記転造歯型２の少なくとも一側端部には、各歯部３の歯厚Ｔが所定の高さ位置において中央部に比し薄く形成され前記被転造部材１との干渉を緩和する干渉緩和部Ｒが設けられているものである。 The present embodiment is a rolling die for rolling a desired tooth profile by plastically deforming the outer peripheral surface by bringing a rolling tooth mold 2 into contact with the outer peripheral surface of the member 1 to be rolled. At least one side end portion of the mold 2 is formed with a tooth thickness T of each tooth portion 3 thinner than the center portion at a predetermined height position, and an interference mitigating portion R for mitigating interference with the rolled member 1. Is provided.
ここで、前述の「側端部」または「中央部」とは、転造方向（被転造部材のころがり方向）に直交する方向（被転造部材の軸方向）における位置を示すものであり、以下も同様である（尚、通常平ダイスの外形は転造方向の方がそれと直交する方向よりも長い場合が多いので、転造方向を長手方向と言うこともある。）。 Here, the above-mentioned “side end portion” or “center portion” indicates a position in a direction (axial direction of the rolled member) perpendicular to the rolling direction (rolling direction of the rolled member). The same applies to the following (normally, the outer shape of a flat die is usually longer in the rolling direction than in the direction perpendicular thereto, so the rolling direction is sometimes referred to as the longitudinal direction).
本実施例は図１に図示したような平ダイスＸであって、図２に図示したように被転造部材１に対して所定の間隔で対向配置された一対の平ダイスＸの対向面間に被転造部材１を挟み込んで回転させながら圧力を加えることでウォーム若しくはねじの歯形Ｆ（ねじ山）を形成するものである。尚、図２中右側のダイスを固定させ、左側のダイスを移動させて転造を行うように記載しているが、夫々のダイスが互いに逆向きに相対移動すれば良いことは言うまでもない。 The present embodiment is a flat die X as shown in FIG. 1, and as shown in FIG. 2, between the opposed surfaces of a pair of flat dies X arranged to face the rolled member 1 at a predetermined interval. A worm or screw tooth profile F (thread) is formed by applying pressure while sandwiching and rotating the rolled member 1. In FIG. 2, the right-side die is fixed and the left-side die is moved to perform rolling, but it goes without saying that each die may be moved relative to each other in the opposite direction.
具体的には、平ダイスＸは、その転造歯型２が設けられない底面９がダイス基準面に設定され、この底面９の反対側の上面に複数条の歯部３が所定間隔で転造方向に対して斜行状態に並設されて成る転造歯型２を有し、この平ダイスＸ（の中央部）の転造歯型２は、転造方向始端側から順に転造方向に対する傾斜角度が夫々異なる食付き部Ａ、仕上げ部Ｂ及び逃げ部Ｃが連続して設けられるものである。前記転造歯型２は、予め所定の寸法に外形加工されたダイス母材を研削加工することで形成される。 Specifically, in the flat die X, the bottom surface 9 on which the rolling tooth mold 2 is not provided is set as a die reference surface, and a plurality of teeth 3 are rolled at predetermined intervals on the upper surface opposite to the bottom surface 9. The rolling tooth mold 2 is formed in parallel with the forming direction in a skewed state, and the rolling tooth mold 2 of the flat die X (the center part thereof) is formed in the rolling direction in order from the rolling direction starting end side. The biting part A, the finishing part B, and the relief part C having different inclination angles are continuously provided. The rolling tooth mold 2 is formed by grinding a die base material that has been previously machined to a predetermined dimension.
仕上げ部Ｂは転造方向において前記底面９（ダイス基準面）に平行な面に沿うものであり、食付き部Ａは転造方向始端側に向かうほど底面側に傾斜する面に沿うものであり、逃げ部Ｃは転造方向終端側に向かうほど底面側に傾斜する面に沿うものである。 The finishing part B is along the surface parallel to the bottom surface 9 (die reference surface) in the rolling direction, and the chamfered part A is along the surface that is inclined toward the bottom surface side toward the starting end side in the rolling direction. The escape portion C extends along the surface that is inclined toward the bottom surface as it goes toward the end in the rolling direction.
従って、対向配置した一対の平ダイスＸが互いに逆向きに相対移動することで、食付き部Ａ、仕上げ部Ｂ及び逃げ部Ｃにおいて間隔が異なることになり（具体的には仕上げ部Ｂにおいて最も間隔が狭まることになり）、この一対の平ダイスＸに挟み込まれた被転造部材１は、回転させられながら圧力を加えられることとなり、ウォーム若しくはねじの歯形Ｆ（ねじ山）が形成される。 Therefore, when the pair of flat dies X arranged opposite to each other move relative to each other in the opposite direction, the distance between the biting portion A, the finishing portion B, and the escape portion C is different (specifically, the most in the finishing portion B). The rolled member 1 sandwiched between the pair of flat dies X is applied with pressure while being rotated, and a worm or screw tooth profile F (thread) is formed. .
本実施例においては歯部３の形状は歯先側に向かうほどその厚さ（歯厚Ｔ）が小さくなる、断面視略台形状若しくは断面視略三角形状を成しており、歯溝５の形状は歯部３とは逆で、歯底側に向かうほどその幅が小さくなる、断面視略台形状若しくは断面視略三角形状を成している。歯底の隅部は歯部３側に凸となる断面視略円弧形状（アール形状）としている。 In the present embodiment, the shape of the tooth portion 3 decreases in thickness (tooth thickness T) toward the tooth tip side, has a substantially trapezoidal shape in cross section or a substantially triangular shape in cross section. The shape is opposite to the tooth portion 3 and has a substantially trapezoidal shape in a sectional view or a substantially triangular shape in a sectional view. The corner of the tooth bottom has a substantially circular arc shape (R shape) in a sectional view that protrudes toward the tooth portion 3 side.
また、平ダイスＸの両側端部（転造方向と直交する方向の両端部）には、図３に図示したように各歯部３が転造歯型２の上面に対し所定の面取り角α（２０〜６０°）で面取りされる面取り部４が設けられている。この面取り部４は、ダイス側端部の歯部３の欠損を抑制するために設けられる。面取り角αが２０°より小さいと面取りの距離が長くなり、被転造部材１の不完全ねじ（歯形）部領域が長くなってしまうため、実用的でなく、６０°を超えるとダイスの歯部３が薄くなりすぎて、欠け易くなるため好ましくない。一般的には、３０°、４５°、６０°が採用される。本実施例においては面取り角αは３０°に設定されている。尚、面取り部４は、本実施例においては食付き部Ａ、仕上げ部Ｂ及び逃げ部Ｃが所定角度で研削形成され歯溝５（歯部３）を形成する前のダイス母材に、一般的な公知の平面研削盤を用いて形成している。 Further, at both side ends (both ends in a direction orthogonal to the rolling direction) of the flat die X, each tooth portion 3 has a predetermined chamfering angle α with respect to the upper surface of the rolling tooth mold 2 as shown in FIG. A chamfered portion 4 that is chamfered at (20 to 60 °) is provided. The chamfered portion 4 is provided in order to suppress the loss of the tooth portion 3 at the die side end portion. If the chamfering angle α is smaller than 20 °, the chamfering distance becomes long and the incomplete thread (tooth profile) region of the rolled member 1 becomes long. Since the part 3 becomes too thin and tends to be chipped, it is not preferable. Generally, 30 °, 45 °, and 60 ° are employed. In this embodiment, the chamfer angle α is set to 30 °. In this embodiment, the chamfered portion 4 is generally used as a die base material before the chamfered portion A, the finished portion B, and the relief portion C are formed by grinding at a predetermined angle to form the tooth gap 5 (tooth portion 3). It is formed using a typical known surface grinder.
ところで、従来の平ダイスＸ’はその上面に複数条の歯部３’が所定間隔で転造方向に対して斜行状態に一様に並設されており、図６、７に図示したように、側端部には各歯部３’が転造歯型２’の上面に対し所定の面取り角α’で面取りされる面取り部４’が設けられている。このような構成の場合、面取り部４’においては、歯部３’の上部が一部除去されているためダイス側端部位８’の歯部３’の欠損を抑制することはできるが、被転造部材の歯形と歯部３’との当接面積は減少するものの、当接部分では隙間なく密着するため（歯厚Ｔ’は側端部位８’においても中央部と同様）、前記背景技術の構成で説明したように面取り部４’のエッジ（歯先の角部）が被転造部材の歯形の歯面に干渉して傷やバリが比較的生じ易い。図中符号５’は歯溝、６’は歯底、７’は歯先である。 By the way, the conventional flat die X ′ has a plurality of teeth 3 ′ uniformly arranged on the upper surface thereof in a skewed manner with respect to the rolling direction at predetermined intervals, as shown in FIGS. In addition, a chamfered portion 4 ′ in which each tooth portion 3 ′ is chamfered at a predetermined chamfering angle α ′ with respect to the upper surface of the rolling tooth mold 2 ′ is provided at the side end portion. In the case of such a configuration, in the chamfered portion 4 ′, since the upper portion of the tooth portion 3 ′ is partially removed, the loss of the tooth portion 3 ′ of the die side end portion 8 ′ can be suppressed. Although the contact area between the tooth profile of the rolling member and the tooth portion 3 ′ is reduced, the contact portion is in close contact with the gap (the tooth thickness T ′ is the same as that of the central portion at the side end portion 8 ′). As described in the configuration of the technology, the edge (corner portion of the tooth tip) of the chamfered portion 4 ′ interferes with the tooth surface of the tooth profile of the rolled member, and scratches and burrs are relatively likely to occur. In the figure, reference numeral 5 'denotes a tooth gap, 6' denotes a tooth bottom, and 7 'denotes a tooth tip.
この点、本実施例においては、図４，５に図示したように、転造歯型２の歯底６の両側端部位８を転造歯型２の上面（若しくはダイスの底面９（ダイス基準面））と平行な直線に対し外方に向かって所定角度で下り傾斜させることで面取り部４における各歯部３の歯厚Ｔが所定の高さ位置（歯先から歯底までの歯丈領域内の所定位置、例えば直線Ｄ）において中央部に比し薄くなるようにし、転造歯型２の歯部３と被転造部材１の歯形Ｆとの間に隙間Ｇを設け（図４）、面取り部４が被転造部材１の歩みや機械剛性の影響によっても被転造部材１の歯形Ｆに可及的に接触しないようにして当該歯部３と被転造部材１との干渉を緩和する干渉緩和部Ｒを構成している。 In this respect, in this embodiment, as shown in FIGS. 4 and 5, both side end portions 8 of the tooth bottom 6 of the rolling tooth mold 2 are set to the upper surface (or the bottom surface 9 of the die (die reference). The tooth thickness T of each tooth portion 3 in the chamfered portion 4 is inclined to a predetermined height position (tooth height from the tooth tip to the tooth bottom). The gap G is provided between the tooth portion 3 of the rolling tooth mold 2 and the tooth profile F of the rolled member 1 so as to be thinner than the central portion at a predetermined position in the region, for example, the straight line D (FIG. 4). ), The chamfered portion 4 does not come into contact with the tooth profile F of the rolled member 1 as much as possible even under the influence of the step of the rolled member 1 and the mechanical rigidity. An interference mitigation unit R that mitigates interference is configured.
具体的には、転造歯型２の歯溝５を転造歯型２の上面（若しくはダイスの底面９（ダイス基準面））と平行な直線に対し転造方向に直交する外方に向かうほど底面側に所定角度で傾斜する方向に沿って形成することで歯底６の両側端部位８が形成されており、底面側に傾斜することを下り傾斜と称している。 Specifically, the tooth groove 5 of the rolling tooth mold 2 is directed outwardly perpendicular to the rolling direction with respect to a straight line parallel to the upper surface of the rolling tooth mold 2 (or the bottom surface 9 of the die (die reference surface)). The side end portions 8 of the tooth bottom 6 are formed by being formed along the direction inclined at a predetermined angle toward the bottom surface side, and the inclination toward the bottom surface side is referred to as a downward inclination.
即ち、転造歯型２の面取り部４における歯底６を所定角度傾斜させるだけで、従来の面取り部４’で生じていた被転造部材１との接触に伴う問題を解決することが可能となる。 That is, it is possible to solve the problem associated with the contact with the member 1 to be rolled, which has occurred in the conventional chamfered portion 4 ′, by simply inclining the tooth bottom 6 in the chamfered portion 4 of the rolling tooth mold 2 by a predetermined angle. It becomes.
また、本実施例において干渉緩和部Ｒは、平ダイスＸの全長に渡って設けているが、食付き部Ａにおいては傷やバリの問題は生じ難いため、少なくとも仕上げ部Ｂと逃げ部Ｃとに設ければ十分な効果が得られる。 Further, in this embodiment, the interference mitigation portion R is provided over the entire length of the flat die X. However, since the problem of scratches and burrs hardly occurs in the biting portion A, at least the finishing portion B and the escape portion C A sufficient effect can be obtained.
また、歯底６の両側端部位８の傾斜角度βは、ダイスの底面９（ダイス基準面）と平行な直線（本実施例では転造歯型２にして仕上げ部Ｂの中央部の歯先７と平行な直線）に対し０°より大きく６０°以内の角度に設定されている。傾斜角度を付けることで所定の高さ位置における歯厚Ｔが薄くなり、溝幅が大きくなる（被転造部材１と面取り部４の歯部３との隙間Ｇが大きくなる）。 In addition, the inclination angle β of both side end portions 8 of the tooth bottom 6 is a straight line parallel to the bottom surface 9 (die reference surface) of the die (in this embodiment, the tooth tip at the center of the finished portion B of the rolling tooth mold 2). The angle is set larger than 0 ° and within 60 ° with respect to a straight line parallel to 7). By providing the inclination angle, the tooth thickness T at a predetermined height position is reduced and the groove width is increased (the gap G between the rolled member 1 and the tooth portion 3 of the chamfered portion 4 is increased).
具体的には、歯底６の両側端部位８の傾斜角度βは、前記面取り角αと同一若しくは該面取り角αより大きな角度で、且つ、転造歯型２にして仕上げ部Ｂの中央部の歯先７と平行な直線に対し６０°以内の角度に設定される。６０°を超えると角度が大き過ぎ、ダイスの生産効率が悪くなってしまう（研削時間が増大する）ため好ましくない。本実施例においては、面取り角αと同一角度β（３０°）に設定されている。 Specifically, the inclination angle β of the both end portions 8 of the tooth bottom 6 is the same as or larger than the chamfering angle α, and the center portion of the finished portion B is formed by the rolling tooth mold 2. Is set to an angle within 60 ° with respect to the straight line parallel to the tooth tip 7. If it exceeds 60 °, the angle is too large, and the production efficiency of the die deteriorates (grinding time increases), which is not preferable. In the present embodiment, the same angle β (30 °) as the chamfer angle α is set.
また、より被転造部材１の歯形Ｆに傷等が付くことを防止するために、転造歯型２の歯部３の角部は曲面でスムーズに繋がる形状に設定するのが好ましい。 Further, in order to prevent the tooth profile F of the rolled member 1 from being damaged, it is preferable to set the corners of the tooth portion 3 of the rolling tooth mold 2 to a shape that is smoothly connected with a curved surface.
具体的には、本実施例は、歯部３の形状は歯先側に向かうほどその厚さ（歯厚Ｔ）が小さくなる、断面視略台形状若しくは断面視略三角形状を成しており、歯溝５の形状は歯部３とは逆で、歯底側に向かうほどその幅が小さくなる、断面視略台形状若しくは断面視略三角形状を成しており、歯底の隅部は歯部３側に凸となる断面視略円弧形状（アール形状）とされている転造歯型２を有し、且つ干渉緩和部Ｒを有するものであるが、この干渉緩和部Ｒは、面取り部４の歯底６の両側端部位８を所定角度傾斜させるだけで形成できる。即ち、ダイスの転造方向に直交する方向の中央部における歯溝５の形状と略同一形状の歯形を有する砥石を用いて転造歯型２を形成し、この転造歯型２の両側端部位８において中央部の歯部３を形成する場合より砥石を深く（ダイスの底面方向に）押し付けてより深い歯溝５を形成するように研削することで薄い歯部３を形成し、干渉緩和部Ｒを構成している。従って、部位によって砥石を換えて加工を行う必要がなく（従来の転造歯型形成用プログラムを変更するだけで良く）、同一の砥石により各歯部３（歯溝５）を形成することができることになる。また、この場合、前記転造歯型２の各歯部３間の歯溝５の形状は、略同一形状（歯先の角部の形状が影響しない溝底側の領域において同一形状）となる。 Specifically, in the present embodiment, the shape of the tooth portion 3 has a substantially trapezoidal shape in cross-sectional view or a substantially triangular shape in cross-sectional view, with the thickness (tooth thickness T) becoming smaller toward the tooth tip side. The shape of the tooth gap 5 is opposite to that of the tooth portion 3, and its width decreases toward the root of the tooth. It has a substantially trapezoidal shape in cross section or a substantially triangular shape in cross section. The rolling tooth mold 2 having a substantially circular arc shape (R shape) that is convex in the tooth portion 3 side and having an interference mitigating portion R, the interference mitigating portion R is chamfered. It can be formed simply by inclining the side end portions 8 of the tooth bottom 6 of the portion 4 at a predetermined angle. That is, the rolling tooth mold 2 is formed using a grindstone having a tooth profile substantially the same as the shape of the tooth groove 5 in the center portion in the direction orthogonal to the rolling direction of the die, and both end portions of the rolling tooth mold 2 are formed. Interference mitigation is achieved by forming a thin tooth 3 by grinding the grinding wheel so as to form a deeper tooth gap 5 by pressing the grindstone deeper (in the direction of the bottom of the die) than when forming the central tooth 3 at the portion 8. Part R is configured. Therefore, it is not necessary to change the grindstone depending on the part (it is only necessary to change the conventional rolling tooth mold forming program), and each tooth portion 3 (tooth gap 5) can be formed with the same grindstone. It will be possible. Further, in this case, the shape of the tooth groove 5 between each tooth portion 3 of the rolling tooth mold 2 is substantially the same shape (the same shape in the groove bottom side region where the shape of the corner portion of the tooth tip does not affect). .
尚、本実施例においては、上述のように面取り部４の歯底６の両側端部位８を所定角度傾斜させて干渉緩和部Ｒを構成しているが、例えば、図８に図示した別例１のように、歯底６の両側端部位８を傾斜させずに両側端部の歯部３をダイスの転造方向に直交する方向の中央部に比し薄く形成することで干渉緩和部Ｒを構成しても良い。この場合、砥石Ｗを換えることなく（従来の転造歯型形成用プログラムを変更するだけで良く）、平ダイスＸの両側端部において中央部の歯部３を形成する場合より狭い間隔で歯溝５の幅が広くなるように研削せしめて薄い歯部３を形成すれば良く、被転造部材１と幅広となった歯溝５との間には隙間Ｇが形成される（図８中符号Ｉは被転造部材１の仮想線）。この干渉緩和部Ｒを構成する手段は、歯溝５の形状が歯底側に向かってその幅がさほど小さくならない歯形や断面視略矩形の歯形に対して有効である。この場合、転造方向に直交する断面視において、転造歯型２の両側端部位８における歯溝５の形状は、中央部の歯溝５の形状を転造方向に直交する方向に平行移動して得られる軌跡と略同一形状（歯先の角部の形状が影響しない溝底側の領域において同一形状）となる。 In the present embodiment, as described above, the interference mitigation portion R is configured by inclining the both end portions 8 of the tooth bottom 6 of the chamfered portion 4 by a predetermined angle, but for example, another example illustrated in FIG. As shown in FIG. 1, the interference mitigation part R is formed by forming the tooth part 3 at both end parts thinner than the center part in the direction orthogonal to the rolling direction of the die without tilting the both end parts 8 of the tooth bottom 6. May be configured. In this case, without changing the grindstone W (it is only necessary to change the conventional rolling tooth mold forming program), the teeth are formed at a narrower interval than in the case where the central teeth 3 are formed at both ends of the flat die X. A thin tooth portion 3 may be formed by grinding so that the width of the groove 5 becomes wide, and a gap G is formed between the rolled member 1 and the wide tooth groove 5 (in FIG. 8). The symbol I is a virtual line of the rolled member 1). The means constituting the interference mitigation portion R is effective for a tooth profile in which the shape of the tooth gap 5 does not become so small toward the root side or a tooth profile having a substantially rectangular shape in cross section. In this case, in the cross-sectional view orthogonal to the rolling direction, the shape of the tooth groove 5 at the both end portions 8 of the rolling tooth mold 2 is parallel to the direction orthogonal to the rolling direction of the central tooth groove 5. The shape is substantially the same as the trajectory obtained in this way (the same shape in the groove bottom region where the shape of the corner of the tooth tip does not affect).
また、本実施例においては、干渉緩和部Ｒは、転造歯型２の両側端部に夫々設けているが、例えば、ねじ部が短くダイスの両側端部にかからず、一方の側端部（面取り部４）とは干渉しないようなねじ等、加工対象となる被転造部材１によっては、両側端に設けずに一側端部にのみ設ける構成としても良い。 Further, in the present embodiment, the interference mitigation portion R is provided at each of both end portions of the rolling tooth mold 2, but for example, the screw portion is short and does not extend to both end portions of the die, Depending on the rolled member 1 to be processed, such as a screw that does not interfere with the portion (the chamfered portion 4), it may be provided only at one side end portion without being provided at both side ends.
尚、本実施例は平ダイスＸに本発明を適用した例であるが、図１１に図示したような略円筒状の丸ダイスＹに適用した別例２においても同様である。丸ダイスＹは全周が平ダイスＸの仕上げ部に相当し、具体的には、丸ダイスＹ（の中央部）の転造歯型２は、回転軸から歯先までの距離ｒが一定な周面に沿うように設けられるものであり、干渉緩和部Ｒは、丸ダイスＹの全周に渡って設けられている。前記転造歯型２は、予め所定の寸法に外形加工されたダイス母材を研削加工することで形成される。 In addition, although a present Example is an example which applied this invention to the flat die | dye X, it is the same also in the other example 2 applied to the substantially cylindrical round die | dye Y illustrated in FIG. The round die Y corresponds to the finished portion of the flat die X on the entire circumference. Specifically, the rolling tooth die 2 of the round die Y (center portion thereof) has a constant distance r from the rotation axis to the tooth tip. The interference mitigating part R is provided along the entire circumference of the round die Y. The rolling tooth mold 2 is formed by grinding a die base material that has been previously machined to a predetermined dimension.
前述した平ダイスＸの場合についての説明は、丸ダイスＹについても適用できる。即ち丸ダイスＹの回転方向が転造方向であり、平ダイスＸにおいて転造歯型の面取り部（または側端部）における歯底の傾斜角度の基準となる底面９（ダイス基準面）を丸ダイスＹの回転軸（基準線）Ｌと読み替えれば良い。丸ダイスＹにも平ダイスＸと同様、側端部（回転軸方向の両端部若しくは一端部）に面取り部が設けられるが、この面取り部において本実施例と同様に歯底の側端部位を傾斜させている。具体的には、図１１においては、転造歯型２の歯底６の両側端部位８を転造歯型２の上面（若しくは丸ダイスＹの回転軸（ダイス基準線Ｌ））と平行な直線に対し外方に向かって所定角度で下り傾斜させることで面取り部４における各歯部の歯厚Ｔが所定の高さ位置（歯先から歯底までの歯丈領域内の所定位置、例えば直線Ｄ）において中央部に比し薄くなるようにする。図１１においては、右側が固定ダイス、左側が移動ダイスであり、符号Ｚはワークレストとして例示している。ワークレスト上に被転造部材１を搬送設置し、左側の移動ダイスを右側の固定ダイス側に接近移動させて被転造部材１の外周面が所定量だけ塑性変形するよう挟み込み、その状態で一対の丸ダイスＹを回転させて転造加工するものである。 The above description of the flat die X can be applied to the round die Y. In other words, the rotation direction of the round die Y is the rolling direction, and the flat die X has a round bottom surface 9 (die reference surface) that serves as a reference for the inclination angle of the root of the chamfered portion (or side end portion) of the rolling tooth mold. What is necessary is just to read as the rotating shaft (reference line) L of the dice | dies Y. Like the flat die X, the round die Y is also provided with a chamfered portion at the side end (both ends or one end in the direction of the rotation axis). In this chamfered portion, the side end portion of the tooth bottom is provided as in the present embodiment. It is tilted. Specifically, in FIG. 11, both end portions 8 of the root 6 of the rolling tooth mold 2 are parallel to the upper surface of the rolling tooth mold 2 (or the rotational axis of the round die Y (die reference line L)). The tooth thickness T of each tooth portion in the chamfered portion 4 is inclined to the outside by a predetermined angle with respect to the straight line so that the tooth thickness T is a predetermined height position (a predetermined position in the tooth height region from the tooth tip to the tooth bottom, for example, In the straight line D), it is made thinner than the central part. In FIG. 11, the right side is a fixed die, the left side is a moving die, and the symbol Z is illustrated as a work rest. The rolled member 1 is transported and installed on the work rest, and the left moving die is moved closer to the right fixed die side so that the outer peripheral surface of the rolled member 1 is plastically deformed by a predetermined amount. A pair of round dies Y are rotated and rolled.
また、図１２に図示したような略円筒状の丸ダイスの外周の一部が切欠されたような形状の所謂欠円ダイスＱに適用した別例３においても同様である。前述した平ダイスＸの場合についての説明は、欠円ダイスＱについても適用できる。即ち欠円ダイスＱの回転方向が転造方向であり、平ダイスＸにおいて転造歯型の面取り部（または側端部）における歯底の傾斜角度の基準となる底面９（ダイス基準面）を欠円ダイスＱの回転軸（基準線）Ｌと読み替えれば良い。 The same applies to another example 3 applied to a so-called missing circular die Q having a shape in which a part of the outer periphery of a substantially cylindrical round die as shown in FIG. 12 is cut out. The description of the case of the flat die X described above can also be applied to the missing circular die Q. In other words, the rotation direction of the cut-out die Q is the rolling direction, and in the flat die X, the bottom surface 9 (die reference surface) that serves as a reference for the inclination angle of the root of the chamfered portion (or side end portion) of the rolling tooth mold is formed. What is necessary is just to read as the rotation axis (reference line) L of the missing circle die Q.
尚、欠円ダイスＱ（の中央部）の転造歯型２は、転造方向始端側から順に、回転軸から歯先までの距離ｒ（以下、半径ｒという。）が夫々異なる食付き部Ａ、仕上げ部Ｂ及び逃げ部Ｃが連続して設けられるものである。前記転造歯型２は、予め所定の寸法に外形加工されたダイス母材を研削加工することで形成される。 In addition, the rolling tooth die 2 of the round circle die Q (in the center thereof) has a chamfered portion in which the distance r (hereinafter referred to as radius r) from the rotation shaft to the tooth tip is different in order from the rolling direction start end side. A, the finishing part B, and the relief part C are provided continuously. The rolling tooth mold 2 is formed by grinding a die base material that has been previously machined to a predetermined dimension.
仕上げ部Ｂは転造方向において半径ｒが一定な周面に沿うものであり、食付き部Ａは転造方向始端側に向かうほど半径ｒが小さくなる周面に沿うものであり、逃げ部Ｃは転造方向終端側に向かうほど半径ｒが小さくなる周面に沿うものである。 Finished portion B is along the circumferential surface having a constant radius r in the rolling direction, and biting portion A is along the circumferential surface where radius r decreases toward the starting end side in the rolling direction. Is along the circumferential surface where the radius r decreases toward the end in the rolling direction.
従って、対向配置した一対の欠円ダイスＱが同期して回転することで、食付き部Ａ、仕上げ部Ｂ及び逃げ部Ｃにおいて間隔が異なることになり（具体的には仕上げ部Ｂにおいて最も間隔が狭まることになり）、この一対の欠円ダイスＱに挟み込まれた被転造部材１は、回転させられながら圧力を加えられることとなり、ウォーム若しくはねじの歯形Ｆ（ねじ山）が形成される。 Accordingly, the pair of cutout dies Q arranged opposite to each other rotate synchronously, so that the intervals at the chamfered portion A, the finished portion B, and the escape portion C are different (specifically, the most spaced at the finished portion B). The rolled member 1 sandwiched between the pair of cutout dies Q is applied with pressure while being rotated, and a worm or screw tooth profile F (thread) is formed. .
欠円ダイスＱにも平ダイスＸと同様、側端部（回転軸方向の両端部若しくは一端部）に面取り部が設けられるが、この面取り部において本実施例と同様に歯底の側端部位を傾斜させている。具体的には、図１２においては、転造歯型２の歯底６の両側端部位８を転造歯型２の上面（若しくは欠円ダイスＱの回転軸（ダイス基準線Ｌ））と平行な直線に対し外方に向かって所定角度で下り傾斜させることで面取り部４における各歯部の歯厚Ｔが所定の高さ位置（歯先から歯底までの歯丈領域内の所定位置、例えば直線Ｄ）において中央部に比し薄くなるようにする。図１２においては、所定の間隔（転造加工後に被転造部材１の外周面が所定量だけ塑性変形するように設定された軸間距離）で固定された一対の欠円ダイスＱと図示していないセンタで支持された被転造部材１を例示している。 Similarly to the flat die X, the cut-off die Q is also provided with a chamfered portion at the side end (both ends or one end in the direction of the rotation axis). Is tilted. Specifically, in FIG. 12, both side end portions 8 of the tooth bottom 6 of the rolling tooth mold 2 are parallel to the upper surface of the rolling tooth mold 2 (or the rotation axis of the missing circular die Q (die reference line L)). The tooth thickness T of each tooth portion in the chamfered portion 4 is inclined at a predetermined angle with respect to a straight line outwardly at a predetermined angle (a predetermined position in a tooth height region from the tooth tip to the tooth bottom, For example, it is made thinner in the straight line D) than in the central part. In FIG. 12, a pair of notch dies Q are shown fixed at a predetermined interval (interaxial distance set so that the outer peripheral surface of the rolled member 1 is plastically deformed by a predetermined amount after rolling). The rolled member 1 is supported by a center that is not.
一対の欠円ダイスＱの切欠部Ｐが向かい合うようにダイス回転方向の位置決めがされた状態で、図示していないセンタで支持された被転造部材１を前記一対の欠円ダイスＱの切欠部Ｐによって設けられた空間内にして所定の位置に搬送設置し、前記一対の欠円ダイスを同期して回転させて被転造部材１の外周面が所定量だけ塑性変形するように転造加工するものである。 In a state in which the notch P of the pair of cutout dies Q faces each other in the direction of rotation of the die, the rolled member 1 supported by a center (not shown) is used as the cutout of the pair of cutout dies Q. Rolling process is carried out so that the outer peripheral surface of the rolled member 1 is plastically deformed by a predetermined amount by conveying and installing it at a predetermined position in the space provided by P and rotating the pair of cutout dies synchronously. To do.
本実施例は上述のように構成したから、一対の転造ダイスにより被転造部材１を挟み込んで転造加工を行う際、転造歯型２にして歯厚Ｔが薄い側端部の歯部３と、被転造部材１の当該歯部３と噛み合う部位との間に隙間Ｇが生じ、それだけ転造歯型２の側端部と被転造部材１との干渉が緩和される。 Since the present embodiment is configured as described above, when the rolling member 1 is sandwiched between a pair of rolling dies to perform the rolling process, the teeth of the side end portion having a thin tooth thickness T as the rolling tooth die 2 are formed. A gap G is generated between the portion 3 and the portion of the rolled member 1 that meshes with the tooth portion 3, and the interference between the side end of the rolled tooth mold 2 and the rolled member 1 is alleviated accordingly.
よって、仕上げ転造の場合には被転造部材１の歯面に傷が生じることを防止でき、また、無垢転造の場合には被転造部材１の端部にバリが生じることを防止でき、更に被転造部材１の振れも抑制できることになる。 Therefore, in the case of finish rolling, it is possible to prevent the tooth surface of the rolled member 1 from being damaged, and in the case of solid rolling, it is possible to prevent the occurrence of burrs at the end of the rolled member 1. In addition, the runout of the rolled member 1 can be suppressed.
具体的にウォームの転造実験例について説明する。仕上げ転造の場合は、面取り部４と被転造部材１との干渉が緩和されることで、図９（ａ）のような傷や、図９（ｂ）のような転造歯型の側端部における歯部の欠損が抑制され、無垢転造の場合は、図１０（ａ）のようなバリが生ぜず、図１０（ｂ）のようにバリを抑制でき、更に、例えば被転造部材１（ウォーム軸）先端部での振れを０．３９４ｍｍから０．１３３ｍｍと６６％も低減でき、ウォーム部の振れを０．２２５ｍｍから０．０２７ｍｍと８８％も低減することが可能となる。この振れの値は図１３に模式的に図示したように、被転造部材１にして円筒形状のウォーム軸を２点支持で基準として該ウォーム軸の先端部（円筒形状）及び該ウォーム軸の中間部に転造加工されたウォーム部において測定したものである。 A specific example of a worm rolling experiment will be described. In the case of finish rolling, the interference between the chamfered portion 4 and the rolled member 1 is alleviated, so that the scratches as shown in FIG. 9A or the rolled tooth shape as shown in FIG. In the case of solid rolling, the burr as shown in FIG. 10 (a) does not occur and the burr can be suppressed as shown in FIG. 10 (b). It is possible to reduce the runout at the tip of the maker 1 (worm shaft) from 0.394 mm to 0.133 mm by 66% and the worm runout from 0.225 mm to 0.027 mm to 88%. . As schematically shown in FIG. 13, the value of this run-out is the rolled member 1 and the cylindrical worm shaft is supported at two points with reference to the tip of the worm shaft (cylindrical shape) and the worm shaft. Measured at a worm part rolled into the intermediate part.
よって、本実施例は、被転造部材とダイスの転造歯型との干渉を可及的に抑制して被転造部材の歯面に傷やバリ等が生じることを防止できる極めて実用性に秀れたものとなる。 Therefore, this embodiment is extremely practical because it can suppress the interference between the rolled member and the rolling tooth mold of the die as much as possible to prevent the tooth surface of the rolled member from being scratched or burred. It will be excellent.
１ 被転造部材
２ 転造歯型
３ 歯部
５ 歯溝
６ 歯底
８ 側端部位
Ａ 食付き部
Ｂ 仕上げ部
Ｃ 逃げ部
Ｑ 欠円ダイス
Ｒ 干渉緩和部
Ｔ 歯厚
Ｘ 平ダイス
Ｙ 丸ダイス
DESCRIPTION OF SYMBOLS 1 Rolled member 2 Rolling tooth type 3 Tooth part 5 Tooth groove 6 Tooth bottom 8 Side end part A Chamfered part B Finishing part C Relief part Q Missing circle die R Interference mitigation part T Tooth thickness X Flat die Y Round die
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| JP2010036061A JP5053399B2 (en) | 2010-02-22 | 2010-02-22 | Rolling dies |
| CN2010105341199A CN102161070B (en) | 2010-02-22 | 2010-10-29 | Rolling mold |
| KR1020100109832A KR101277383B1 (en) | 2010-02-22 | 2010-11-05 | Form rolling die |
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| JP2010036061A JP5053399B2 (en) | 2010-02-22 | 2010-02-22 | Rolling dies |
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| KR101603597B1 (en) | 2014-11-28 | 2016-03-16 | 주식회사 상신정공 | Form rolling die of gear |
| CN108237195A (en) * | 2016-12-27 | 2018-07-03 | 天津市信力达齿轮制造有限公司 | A kind of processing mold of precise inner gear |
| KR101819587B1 (en) | 2017-10-18 | 2018-01-17 | 성원에이씨공업(주) | Worm shaft manufacturing type Precursor dies |
| JP7280763B2 (en) * | 2019-06-27 | 2023-05-24 | Ｋｙｂ株式会社 | Worm shaft, worm reduction gear, and method for manufacturing worm shaft |
| DE102020103151A1 (en) * | 2020-02-07 | 2021-08-12 | Profiroll Technologies Gmbh | Rolling tool and method for rolling a profile |
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| JPS4946558A (en) * | 1972-09-12 | 1974-05-04 | ||
| SU837511A1 (en) * | 1976-10-01 | 1981-06-15 | Plita Igor ,Su | Thread tangential rolling on method |
| JPH0114372Y2 (en) * | 1984-12-17 | 1989-04-26 | ||
| JPS61162340U (en) * | 1985-03-29 | 1986-10-08 | ||
| JPH0466239A (en) * | 1990-06-29 | 1992-03-02 | Ntn Corp | Method for form-rolling axial billet to be form-rolled |
| JPH07178626A (en) * | 1993-12-24 | 1995-07-18 | O S G Kk | Manufacture of corrugated flat die |
| JPH0946558A (en) * | 1995-07-25 | 1997-02-14 | Fuji Photo Optical Co Ltd | Tally display device for television camera |
| CN2356779Y (en) * | 1998-07-16 | 2000-01-05 | 王雪云 | Variable tooth type screw axial feed thread rolling die |
| US6149363A (en) * | 1998-10-29 | 2000-11-21 | Huck International, Inc. | Lightweight threaded fastener and thread rolling die |
| JP2004001103A (en) * | 2002-04-05 | 2004-01-08 | Yamawa Seisakusho:Kk | Thread forming tap |
| JP3720805B2 (en) * | 2002-11-27 | 2005-11-30 | 株式会社彌満和製作所 | Rolling dice |
| JP4201647B2 (en) * | 2003-06-04 | 2008-12-24 | オーエスジー株式会社 | Rolled flat dies, rolling dies and manufacturing method thereof |
| CN100513000C (en) * | 2005-08-29 | 2009-07-15 | 徐根林 | Processing tool of high strength bolt and processing method of the processing tool |
| JP4804167B2 (en) * | 2006-02-20 | 2011-11-02 | トヨタ自動車株式会社 | Rolling tool and simultaneous rolling method of screw or worm and minority spline |
| JP2007289999A (en) * | 2006-04-25 | 2007-11-08 | Nachi Fujikoshi Corp | Flat die for form rolling of worm shaft |
| JP5401667B2 (en) * | 2007-10-12 | 2014-01-29 | 有希 安藤 | Method for manufacturing rolled screw shaft |
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| KR20110096479A (en) | 2011-08-30 |
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