JP5515730B2 - Threaded electrodeposition tool - Google Patents

Threaded electrodeposition tool Download PDF

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JP5515730B2
JP5515730B2 JP2009293091A JP2009293091A JP5515730B2 JP 5515730 B2 JP5515730 B2 JP 5515730B2 JP 2009293091 A JP2009293091 A JP 2009293091A JP 2009293091 A JP2009293091 A JP 2009293091A JP 5515730 B2 JP5515730 B2 JP 5515730B2
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screw
thickness
thread
base metal
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JP2011131333A (en
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和寛 藤嵜
正寿 西川
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Mitsubishi Materials Corp
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Description

本発明は、台金の外周部に砥粒が電着されたネジ状部が形成されて歯車の歯形を加工するネジ状電着工具に関するものである。   The present invention relates to a screw-shaped electrodeposition tool in which a screw-shaped portion in which abrasive grains are electrodeposited is formed on the outer peripheral portion of a base metal to process a gear tooth shape.

歯車の歯形を加工する工具として、例えば特許文献１、２には、外形略円柱状の台金の外周部にネジ状部が形成されて、その表面にダイヤモンドやｃＢＮ等の超砥粒が電着されたネジ状電着工具が記載されている。このようなネジ状電着工具では、台金をその中心軸線回りに回転させつつ上記ネジ状部を歯車に噛み合わせることによって超砥粒により研削し、所定の精度の歯形に形成してゆく。   As a tool for processing a gear tooth profile, for example, in Patent Documents 1 and 2, a screw-like portion is formed on the outer peripheral portion of a base metal having a substantially cylindrical outer shape, and superabrasive grains such as diamond and cBN are electroplated on the surface. An attached threaded electrodeposition tool is described. In such a screw-shaped electrodeposition tool, while rotating the base metal around its central axis, the screw-shaped portion is meshed with a gear to be ground with superabrasive grains to form a tooth profile with a predetermined accuracy.

特開２００３−２６６２４１号公報JP 2003-266241 A 特開２００７−９８５２７号公報JP 2007-98527 A

ところが、このようなネジ状電着工具では、台金におけるネジ状部の表面に超砥粒を電解めっきにより電着する際に、軸線方向におけるネジ状部の中央部よりも両端部で電流密度が集中しやすくてめっき層が厚くなり、このため超砥粒が電着されたネジ状部のネジ山の軸線方向における厚さも、中央部よりも両端部で厚くなってしまうおそれがあった。従って、そのようなネジ状電着工具によって歯車を研削すると歯形に誤差が生じやすく、高精度の歯形加工を行うことが困難となる。   However, in such a screw-shaped electrodeposition tool, when electrodepositing superabrasive grains on the surface of the screw-shaped portion of the base metal by electrolytic plating, the current density at both ends rather than the central portion of the screw-shaped portion in the axial direction. As a result, the thickness of the plating layer becomes thicker and the thickness of the threaded portion of the thread-like portion electrodeposited with superabrasive grains in the axial direction may be thicker at both end portions than at the central portion. Therefore, if the gear is ground with such a screw-shaped electrodeposition tool, an error is likely to occur in the tooth profile, and it becomes difficult to perform high-precision tooth profile processing.

本発明は、このような背景の下になされたもので、ネジ状部の両端部で中央部よりめっき層が厚くなっても、高い精度で歯車の歯形加工が可能なネジ状電着工具を提供することを目的としている。   The present invention has been made under such a background. A screw-shaped electrodeposition tool capable of gear tooth processing with high accuracy even when the plating layer is thicker than the central portion at both ends of the screw-shaped portion. It is intended to provide.

上記課題を解決して、このような目的を達成するために、本発明は、軸線回りに回転させられる台金の外周部に、上記軸線回りに螺旋状に捩れたネジ状部が形成され、このネジ状部の表面に砥粒が電着されてなるネジ状電着工具であって、上記台金における上記ネジ状部のネジ山の厚さが、上記軸線方向の中央部では一定とされるとともに、この中央部よりも上記軸線方向の両端部で小さくされていることを特徴とする。 In order to solve the above-mentioned problems and achieve such an object, the present invention is formed with a screw-like portion helically twisted around the axis on the outer periphery of the base metal rotated around the axis, A screw-shaped electrodeposition tool in which abrasive grains are electrodeposited on the surface of the screw-shaped portion, and the thread thickness of the screw-shaped portion of the base metal is constant at the central portion in the axial direction. In addition, it is characterized in that it is made smaller at both end portions in the axial direction than the central portion .

従って、このようなネジ状電着工具においては、こうして台金におけるネジ状部のネジ山の厚さが軸線方向の中央部では一定とされるとともに、この中央部よりも上記軸線方向の両端部で小さくされているので、この両端部で電流密度の集中によりめっき層の厚さが厚くなっても、砥粒が電着されたネジ状部においては、軸線方向の中央部と両端部とでネジ山の厚さの均一化を図ることができる。このため、歯車の研削に用いて歯形誤差が生じるのを抑えて、高精度の歯形加工を行うことが可能となる。 Therefore, in such a screw-shaped electrodeposition tool, the thread thickness of the screw-shaped portion of the base metal is made constant at the central portion in the axial direction, and both end portions in the axial direction are more than the central portion. Therefore, even if the thickness of the plating layer is increased due to the concentration of current density at both ends, the screw-shaped portion on which the abrasive grains are electrodeposited has a central portion and both ends in the axial direction. The thickness of the screw thread can be made uniform. For this reason, it is possible to perform tooth profile machining with high accuracy while suppressing occurrence of tooth profile errors when used for grinding gears.

ここで、電解めっきの際の電流密度の集中によるめっき層の厚さの増大は、ネジ状部の両端面から該ネジ状部のネジの１ピッチ程度の範囲で顕著となる傾向がある。このため、上記台金におけるネジ状部のネジ山の厚さは、上記ネジ状部の両端面と、これら両端面からそれぞれ上記軸線方向において該ネジ状部のネジのピッチの０．５ピッチ〜１．５ピッチの範囲内の位置との間の部分である上記両端部において、上記中央部よりも小さくされていることが望ましい。なお、このネジ山の厚さは、台金におけるネジ状部の有効径の位置（ネジ状部の外径からアデンダムだけ内周側の位置）での厚さとされて、ネジ状部の中央部に対して両端部ではネジ山の一対の斜面（フランク）が全体的に互いに等しい後退量で該ネジ山の厚さ方向の中心線側に後退するように厚さが小さくなるようにされるのが望ましい。   Here, the increase in the thickness of the plating layer due to the concentration of the current density during electrolytic plating tends to be remarkable in a range of about one pitch of the screw of the screw-like portion from both end faces of the screw-like portion. For this reason, the thickness of the thread of the screw-like part in the base metal is 0.5 pitch of the screw pitch of the screw-like part in the axial direction from the both end faces of the screw-like part, respectively. It is desirable that the both end portions, which are portions between the positions within the range of 1.5 pitches, be smaller than the central portion. The thickness of this thread is the thickness at the position of the effective diameter of the screw-shaped part of the base metal (the position on the inner peripheral side of the addendum from the outer diameter of the screw-shaped part), and the central part of the screw-shaped part On the other hand, at both ends, the pair of slopes (flanks) of the screw thread are reduced in thickness so as to move backward toward the center line side in the thickness direction of the screw thread with the same amount of retraction. Is desirable.

また、同じく電流密度の集中によるめっき層の厚さの増大は、ネジ状部の両端部のうちでも、それぞれその端面に向かうに従い大きくなる傾向がある。従って、上記台金におけるネジ状部のネジ山の厚さは、このネジ状部の両端部のうちでも、上記軸線方向において上記ネジ状部の両端面に向かうに従い漸次小さくなるようにされているのが望ましい。   Similarly, the increase in the thickness of the plating layer due to the concentration of the current density tends to increase as it goes toward the end surface of both ends of the screw-like portion. Therefore, the thickness of the thread of the screw-like portion in the base metal is gradually reduced toward the both end faces of the screw-like portion in the axial direction among both end portions of the screw-like portion. Is desirable.

以上説明したように、本発明によれば、電解めっきの際の電流密度の集中によりネジ状部の両端部でめっき層の厚さが厚くなっても、砥粒が電着されたネジ状部においてはネジ山の厚さを軸線方向に亙って均一にすることができ、これにより歯車に高精度の歯形加工を施すことが可能となる。   As described above, according to the present invention, even if the thickness of the plating layer is increased at both ends of the screw-like portion due to the concentration of current density during electrolytic plating, the screw-like portion in which the abrasive grains are electrodeposited. In this case, the thickness of the thread can be made uniform over the axial direction, so that the gear can be processed with high accuracy.

本発明の一実施形態を示す（ａ）側面図、（ｂ）図（ａ）に示す側面図に対応する位置での台金におけるネジ状部のネジ山の厚さを示す図、（ｃ）図（ａ）に示す側面図に対応する位置での金属めっき層の厚さを示す図である。(A) A side view showing an embodiment of the present invention, (b) A diagram showing a thread thickness of a screw-like portion in a base metal at a position corresponding to the side view shown in FIG. It is a figure which shows the thickness of the metal plating layer in the position corresponding to the side view shown to a figure (a). 図１に示す実施形態の台金におけるネジ状部のネジ山の軸線に沿った拡大断面図である。It is an expanded sectional view along the axis line of the screw thread of the screw-shaped part in the base metal of the embodiment shown in FIG.

本発明の一実施形態におけるネジ状電着工具は、鋼材等からなる外形が図１（ａ）に示すような概略多段円柱状の台金１の外周部に、この台金１の軸線Ｏ回りに捩れる１または複数条の螺旋状のネジ状部２が形成され、このネジ状部２の表面に、ダイヤモンドやｃＢＮ等の超砥粒よりなる砥粒がＮｉ等の金属めっき層によって略単層に電着されて固定された砥粒層が形成されたものである。   The screw-shaped electrodeposition tool according to one embodiment of the present invention is formed around the axis O of the base metal 1 around the outer periphery of the base metal 1 having a substantially multi-stage columnar shape as shown in FIG. One or a plurality of spiral screw-like portions 2 that are twisted into the surface are formed. On the surface of the screw-like portion 2, abrasive grains made of superabrasive grains such as diamond and cBN are formed by a metal plating layer such as Ni. An abrasive layer that is electrodeposited and fixed to the layer is formed.

ここで、台金１の中心部には軸線Ｏに沿って貫通する図示されない取付孔が形成されるとともに、台金１の両端部３はネジ状部２のネジの谷底の径よりも小さな外径とされ、この両端部３にはキー溝４が形成されている。なお、この両端部３の表面には砥粒層は形成されていない。このようなネジ状電着工具は、上記取付孔に図示されない回転軸が挿通されて、この回転軸に設けたキーが上記キー溝４に噛合することにより回転軸と一体に軸線Ｏ回りに回転させられて、ワークである歯車の歯形研削に用いられる。   Here, an attachment hole (not shown) penetrating along the axis O is formed in the central portion of the base metal 1, and both end portions 3 of the base metal 1 are smaller than the diameter of the thread bottom of the screw-like portion 2. The key groove 4 is formed at both ends 3. Note that an abrasive layer is not formed on the surfaces of both end portions 3. In such a screw-shaped electrodeposition tool, a rotating shaft (not shown) is inserted into the mounting hole, and a key provided on the rotating shaft is engaged with the key groove 4 to rotate integrally with the rotating shaft around the axis O. And is used for tooth profile grinding of a gear which is a workpiece.

そして、上記台金１におけるネジ状部２のネジ山５の厚さは、軸線Ｏ方向においてネジ状部２の中央部２Ａよりも両端部２Ｂで小さくされている。ここで、本実施形態では、例えば図２に示すように台金１におけるネジ状部２の有効径の位置（ネジ状部２の外径からアデンダムＡだけ内周側の位置）Ｐを基準として、ネジ山５の厚さＴがネジ状部２の中央部２Ａよりも両端部２Ｂで小さくなるようにされており、特にネジ山５の一対の斜面（フランク）５Ａが全体的に互いに等しい後退量で該ネジ山５の厚さ方向の中心線Ｑ側に後退するようにして厚さＴが小さくなるようにされている。従って、このネジ山５の中心線Ｑがなすリードは中央部２Ａから両端部２Ｂに亙って一定とのままとされる。   And the thickness of the thread 5 of the screw-shaped part 2 in the said metal base 1 is made smaller by the both ends 2B than the center part 2A of the screw-shaped part 2 in the axis line O direction. Here, in this embodiment, for example, as shown in FIG. 2, the position of the effective diameter of the screw-like portion 2 in the base metal 1 (the position on the inner peripheral side of the addendum A from the outer diameter of the screw-like portion 2) P is used as a reference. The thickness T of the screw thread 5 is made smaller at both end portions 2B than at the central portion 2A of the screw-shaped part 2, and in particular, the pair of inclined surfaces (flanks) 5A of the screw thread 5 are entirely equal to each other. The thickness T is reduced by the amount so as to recede toward the center line Q in the thickness direction of the thread 5. Therefore, the lead formed by the center line Q of the screw thread 5 is kept constant from the central portion 2A to both end portions 2B.

また、本実施形態では、上述のように台金１の両端部３がネジ状部２の谷底の径よりも小さくされることにより、ネジ状部２の両端部２Ｂには軸線Ｏに垂直な端面２Ｃが台金１の両端部３の周りに形成される。そして、本実施形態においては、これらネジ状部２の両端面２Ｃから軸線Ｏ方向においてネジ状部２のネジの少なくとも１ピッチの範囲内で、台金１におけるネジ状部２のネジ山５の厚さＴが上述のように中央部２Ａよりも両端部２Ｂで小さくなるようにされている。   Further, in the present embodiment, both end portions 3 of the base metal 1 are made smaller than the diameter of the valley bottom of the screw-like portion 2 as described above, so that both ends 2B of the screw-like portion 2 are perpendicular to the axis O. End surfaces 2 </ b> C are formed around both end portions 3 of the base metal 1. And in this embodiment, within the range of at least 1 pitch of the screw of the screw-like part 2 in the direction of the axis O from both end faces 2C of these screw-like parts 2, the thread 5 of the screw-like part 2 of the base metal 1 As described above, the thickness T is made smaller at both end portions 2B than at the central portion 2A.

さらにまた、こうして両端部２Ｂで中央部２Ａよりも小さくなる台金１におけるネジ状部２のネジ山５の厚さＴは、これら両端部２Ｂにおいてそれぞれの端面２Ｃ側に向かうに従い漸次小さくなるようにされており、特に本実施形態では図１（ｂ）に示すようにこの両端部２Ｂにおけるネジ山５の厚さＴが、中央部２Ａにおけるネジ山５の厚さＴ０に対して一定の割合で両端面２Ｃ側に向かうに従い小さくなるようにされている。また、こうして厚さＴが小さくなる割合は、両端部２Ｂ同士では互いに等しくされている。   Furthermore, the thickness T of the thread 5 of the screw-like portion 2 in the base metal 1 that becomes smaller than the central portion 2A at both end portions 2B is gradually reduced toward the respective end surfaces 2C at these both end portions 2B. In particular, in this embodiment, as shown in FIG. 1B, the thickness T of the thread 5 at both ends 2B is a constant ratio with respect to the thickness T0 of the thread 5 at the center 2A. Thus, it becomes smaller as it goes toward the both end faces 2C. In addition, the rate at which the thickness T decreases in this way is equal between the two end portions 2B.

なお、この図１に示すように、本実施形態では、両端面２Ｃから軸線Ｏ方向にちょうどネジ状部２のネジの１ピッチの位置から両端面２Ｃ側に向けて台金１におけるネジ状部２のネジ山５の厚さＴが小さくなるようにされるとともに、これら両端面２Ｃから１ピッチの位置同士の間の部分である上記中央部２Ａではネジ山の厚さＴは一定とされている。言い換えれば、本実施形態では、これら両端面２Ｃから１ピッチの位置までが、これらの位置の間のネジ状部２の中央部２Ａに対してネジ山５の厚さＴが小さくなる両端部２Ｂとされる。   As shown in FIG. 1, in this embodiment, the screw-like portion of the base metal 1 from the position of one pitch of the screw of the screw-like portion 2 in the direction of the axis O from the both end surfaces 2C toward the both-end surface 2C side. The thickness T of the second thread 5 is made smaller, and the thread thickness T is constant in the central portion 2A, which is a portion between the two end faces 2C and one pitch. Yes. In other words, in this embodiment, from both end faces 2C to the position of one pitch, both end portions 2B where the thickness T of the thread 5 is smaller than the central portion 2A of the screw-like portion 2 between these positions. It is said.

このようにネジ状部２が形成された台金１は、砥粒層を形成しない両端部３や上記取付孔、あるいはネジ状部２の端面２Ｃが適宜マスキングされた上で、上述のような超砥粒が分散させられたＮｉ等の金属めっき液中に浸漬され、同じくこの金属めっき液中に浸漬された電極との間で通電させられて、電解めっきによりネジ状部２の表面に超砥粒を取り込みつつ金属めっき層が被覆されて超砥粒が固着され、次いで超砥粒が分散されていない金属めっき液中に浸漬されて無電解めっきにより金属めっき層が所定の厚さにまで成長させられて、上記砥粒層が形成される。   In this way, the base 1 with the screw-like portion 2 formed thereon is appropriately masked on both end portions 3 that do not form the abrasive grain layer, the mounting holes, or the end face 2C of the screw-like portion 2 as described above. It is immersed in a metal plating solution such as Ni in which superabrasive grains are dispersed, and is energized between electrodes immersed in the metal plating solution, and is superposed on the surface of the threaded portion 2 by electrolytic plating. The metal plating layer is coated while the abrasive grains are taken in, the super abrasive grains are fixed, and then the superabrasive grains are immersed in a metal plating solution in which the abrasive grains are not dispersed, and the metal plating layer reaches a predetermined thickness by electroless plating. Growing to form the abrasive layer.

しかるに、このうち電解めっきにより被覆される金属めっき層の厚さｔは、図１（ｃ）に示すように特に通電の際に電流密度が集中しがちなネジ状部２の両端部２Ｂで厚くなる傾向があるのに対して、上記構成のネジ状電着工具では、このネジ状部２の両端部２Ｂにおいて台金１のネジ山５の厚さＴが中央部２Ａよりも小さくされているので、超砥粒が電着させられた状態でのネジ状部においてはネジ山の厚さを均一にすることができる。このため、かかるネジ状電着工具によれば、歯車の研削を行った際に歯形誤差が生じるのを抑えることができて、より高精度の歯形加工を施すことが可能となる。   However, among these, the thickness t of the metal plating layer coated by electrolytic plating is thick at both end portions 2B of the screw-like portion 2 where the current density tends to concentrate particularly during energization as shown in FIG. 1 (c). On the other hand, in the screw-shaped electrodeposition tool having the above-described configuration, the thickness T of the thread 5 of the base metal 1 is smaller than that of the central portion 2A at both ends 2B of the screw-shaped portion 2. Therefore, the thickness of the thread can be made uniform in the threaded portion in a state where the superabrasive grains are electrodeposited. For this reason, according to such a screw-shaped electrodeposition tool, it is possible to suppress occurrence of a tooth profile error when gears are ground, and it is possible to perform tooth profile processing with higher accuracy.

また、このようにネジ状部２の両端部２Ｂにおいて厚くなる金属めっき層の厚さｔは、図１（ｃ）に示したようにネジ状部２の両端面２Ｃから軸線Ｏ方向に該ネジ状部２のネジの１ピッチ分程度の範囲内で大きくなる傾向があるのに対し、本実施形態では、同じくこのネジ状部２の両端面２Ｃから軸線Ｏ方向に該ネジ状部２のネジの１ピッチの範囲内で、中央部２Ａよりもネジ山５の厚さＴが小さくなるようにされている。このため、上述のような金属めっき層の厚さの増大に対して、超砥粒が電着させられた状態では確実にネジ状部のネジ山の厚さを均一にすることができて、一層高精度の歯形加工を促すことが可能となる。   Further, the thickness t of the metal plating layer that becomes thicker at the both end portions 2B of the screw-like portion 2 is such that the screw t extends from the both end surfaces 2C of the screw-like portion 2 in the direction of the axis O as shown in FIG. In contrast to this, in the present embodiment, the screw of the screw-like portion 2 extends in the direction of the axis O from both end faces 2C. The thickness T of the screw thread 5 is made smaller than that of the central portion 2A. For this reason, with respect to the increase in the thickness of the metal plating layer as described above, in the state where the superabrasive grains are electrodeposited, the thickness of the thread of the screw-like portion can be made uniform, It becomes possible to promote the tooth profile processing with higher accuracy.

ただし、こうして台金１におけるネジ状部２のネジ山５の厚さＴが小さくなる範囲が、両端面２Ｃから軸線Ｏ方向にネジ状部２の中央部２Ａ側に大きくなりすぎると、ネジ山５の厚さＴが一定とされるこの中央部２Ａと、電流密度が集中して金属めっき層の厚さが増大する両端部２Ｂとの間の部分で、電着後のネジ山の厚さが小さくなる部分が生じるおそれがある。その一方で、この範囲が狭すぎると上述の効果が確実に奏功されなくなるので、このように台金１におけるネジ状部２のネジ山５の厚さＴが小さくなる範囲は、ネジ状部２の両端面２Ｃからネジ山５の１ピッチの±５０％までの範囲とされるのが望ましく、すなわちネジ状部２の両端面２Ｃと、これら両端面２Ｃからそれぞれ軸線Ｏ方向において該ネジ状部２のネジのピッチの０．５ピッチ〜１．５ピッチの範囲内の位置との間の部分が上記両端部２Ｂとされて、この両端部２Ｂで台金１におけるネジ状部２のネジ山５の厚さＴが中央部２Ａよりも小さくされるのが望ましい。   However, if the range in which the thickness T of the thread 5 of the threaded portion 2 in the base metal 1 becomes small in this way becomes too large from the both end faces 2C in the direction of the axis O toward the central portion 2A of the threaded portion 2, 5 is the thickness of the thread after electrodeposition in a portion between the central portion 2A where the thickness T is constant and the both end portions 2B where the current density is concentrated and the thickness of the metal plating layer is increased. There is a possibility that a part where the value becomes small is generated. On the other hand, if the range is too narrow, the above-described effect is not surely achieved. Thus, the range in which the thickness T of the thread 5 of the screw-like portion 2 in the base metal 1 is reduced is the screw-like portion 2. It is desirable to be within a range of ± 50% of one pitch of the thread 5 from both end faces 2C of the screw, that is, the both end faces 2C of the screw-like portion 2 and the screw-like portions in the direction of the axis O from these both end faces 2C. The part between the positions of the pitch of the screw 2 in the range of 0.5 pitch to 1.5 pitch is the both end portions 2B, and the screw threads of the screw-like portion 2 in the base metal 1 at the both end portions 2B. The thickness T of 5 is preferably smaller than the central portion 2A.

さらに、ネジ状部２の両端部２Ｂにおける金属めっき層の厚さは、電流密度がネジ状部２の両端面２Ｃ側でより集中しやすくなるのに伴い、両端部２Ｂのうちでも図１（ｃ）に示したようにこの両端面２Ｃに向かうに従い漸次厚くなるのに対して、本実施形態では、台金１におけるネジ状部２のネジ山５の厚さＴも、軸線Ｏ方向においてこのネジ状部２の両端面２Ｃ側に向かうに従い漸次小さくなるようにされている。このため、このネジ状部２の両端部２Ｂにおいても、両端面２Ｃ側に向かうに従い金属めっき層の厚さが漸次厚くなるのを、台金１のネジ山５の厚さＴを漸次小さくすることによって相殺して電着後のネジ山の厚さを均一にすることができ、さらに歯車の歯形加工の精度向上を図ることが可能となる。   Further, the thickness of the metal plating layer at both end portions 2B of the screw-like portion 2 is the same as that of the both end portions 2B as shown in FIG. In this embodiment, the thickness T of the thread 5 of the screw-like portion 2 in the base metal 1 is also increased in the direction of the axis O, as shown in c). It is made to become small gradually as it goes to the both end surfaces 2C side of the screw-shaped part 2. FIG. For this reason, the thickness T of the thread 5 of the base metal 1 is gradually reduced in the both end portions 2B of the screw-like portion 2 so that the thickness of the metal plating layer gradually increases toward the both end surfaces 2C. Accordingly, the thickness of the thread after electrodeposition can be made uniform, and the gear tooth profile machining accuracy can be improved.

なお、こうしてネジ状部２の両端部２Ｂにおいて小さくされる台金１のネジ山５の厚さＴは、この台金１におけるネジ状部２の中央部２Ａのネジ山５の厚さＴに対する差が小さすぎると、上述のように電着後のネジ状部のネジ山の厚さを確実に均一にすることができなくなるおそれがある一方、逆にこのネジ山５の厚さＴの差が大きすぎると、電着後のネジ山の厚さがネジ状部の両端部で小さくなりすぎて、やはりネジ状部の全体に亙ってネジ山の厚さを均一にすることができなくなるおそれが生じる。   In addition, the thickness T of the thread 5 of the base metal 1 thus reduced at both ends 2B of the screw-shaped part 2 is relative to the thickness T of the thread 5 of the central part 2A of the thread-shaped part 2 of the base metal 1. If the difference is too small, there is a possibility that the thickness of the threaded portion of the threaded portion after electrodeposition cannot be made uniform uniformly as described above. If the thickness is too large, the thickness of the thread after electrodeposition becomes too small at both ends of the thread-like part, and it is impossible to make the thickness of the thread uniform over the entire thread-like part. There is a fear.

このため、台金１におけるネジ状部２の両端部２Ｂのネジ山５の厚さＴは、電着される超砥粒の粒径や、電着時の両端部２Ｂにおける電流密度などにもよるが、ネジ山５の上記中心線Ｑがネジ状部２の端面２Ｃ上に位置したところでの仮想のネジ山５の厚さＴ（同位置での実際のネジ山５の厚さの２倍の厚さ）として、中央部２Ａのネジ山５の厚さＴに対し、この中央部２Ａにおける砥粒層の金属めっき層の厚さの２０％〜４０％小さな範囲に設定されるのが望ましい。   For this reason, the thickness T of the thread 5 at both ends 2B of the screw-like portion 2 in the base metal 1 depends on the particle diameter of the superabrasive grains to be electrodeposited, the current density at both ends 2B during electrodeposition, and the like. However, the thickness T of the virtual thread 5 where the center line Q of the thread 5 is located on the end face 2C of the screw-like portion 2 (twice the thickness of the actual thread 5 at the same position) The thickness of the thread 5 of the central portion 2A is preferably set in a range 20% to 40% smaller than the thickness of the metal plating layer of the abrasive layer in the central portion 2A. .

１ 台金
２ ネジ状部
２Ａ ネジ状部２の中央部
２Ｂ ネジ状部２の端部
２Ｃ ネジ状部２の端面
５ ネジ山
Ｏ 台金１の軸線
Ｐ ネジ状部２の有効径の位置
Ｑ ネジ山５の中心線
Ｔ 位置Ｐにおけるネジ山５の厚さ DESCRIPTION OF SYMBOLS 1 Base metal 2 Screw-shaped part 2A Center part of the screw-shaped part 2B End part of the screw-shaped part 2 2C End surface of the screw-shaped part 2 5 Thread O The axis line of the base metal 1 P The position of the effective diameter of the thread-shaped part Q Centerline of thread 5 T Thickness of thread 5 at position P

Claims (3)

軸線回りに回転させられる台金の外周部に、上記軸線回りに螺旋状に捩れたネジ状部が形成され、このネジ状部の表面に砥粒が電着されてなるネジ状電着工具であって、上記台金におけるネジ状部のネジ山の厚さが、上記軸線方向の中央部では一定とされるとともに、この中央部よりも上記軸線方向の両端部で小さくされていることを特徴とするネジ状電着工具。 A screw-shaped electrodeposition tool in which a screw-like portion spirally twisted around the axis is formed on the outer periphery of the base metal rotated around the axis, and abrasive grains are electrodeposited on the surface of the screw-like portion. The thickness of the thread of the threaded portion of the base metal is constant at the central portion in the axial direction, and is smaller at both end portions in the axial direction than the central portion. Threaded electrodeposition tool. 上記台金におけるネジ状部のネジ山の厚さが、上記ネジ状部の両端面と、これら両端面からそれぞれ上記軸線方向において該ネジ状部のネジのピッチの０．５ピッチ〜１．５ピッチの範囲内の位置との間の部分である上記両端部において、上記中央部よりも小さくされていることを特徴とする請求項１に記載のネジ状電着工具。   The thread thickness of the threaded portion in the base metal is 0.5 to 1.5 pitches of the threaded portion of the threaded portion in the axial direction from both end surfaces of the threaded portion and the both end surfaces. 2. The screw-shaped electrodeposition tool according to claim 1, wherein the both end portions, which are portions between positions within a pitch range, are made smaller than the central portion. 上記台金におけるネジ状部のネジ山の厚さが、上記軸線方向の上記両端部において上記ネジ状部の両端面に向かうに従い漸次小さくなるようにされていることを請求項１または請求項２に記載のネジ状電着工具。 The screw thickness of the screw-shaped part in the said base metal is made to become gradually small as it goes to the both end surfaces of the said screw-shaped part in the said both ends of the said axial direction. The threaded electrodeposition tool described in 1.
JP2009293091A 2009-12-24 2009-12-24 Threaded electrodeposition tool Expired - Fee Related JP5515730B2 (en)

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JPS57107735A (en) * 1980-12-26 1982-07-05 Shigeyoshi Osada Gear cutting method
DE3704607A1 (en) * 1987-02-13 1988-08-25 Liebherr Verzahntech Gmbh METHOD FOR MACHINING GEARS
NL9002611A (en) * 1990-11-29 1992-06-16 Crown Gear Bv TOOLS FOR MANUFACTURING CROWN WHEELS, AND METHOD FOR MANUFACTURING SUCH TOOLS.
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