JP5808184B2 - Manufacturing method of through-hole constituting member - Google Patents

Manufacturing method of through-hole constituting member Download PDF

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JP5808184B2
JP5808184B2 JP2011159404A JP2011159404A JP5808184B2 JP 5808184 B2 JP5808184 B2 JP 5808184B2 JP 2011159404 A JP2011159404 A JP 2011159404A JP 2011159404 A JP2011159404 A JP 2011159404A JP 5808184 B2 JP5808184 B2 JP 5808184B2
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hole
peripheral surface
inner peripheral
communication
intermediate product
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JP2013023731A (en
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弘子 渡邊
弘子 渡邊
彰 宇田川
彰 宇田川
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富士電子工業株式会社
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02P10/00—Technologies related to metal processing
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Description

本発明は、例えばボールナットの主要構成部材に代表される様な、貫通孔構成部材を製造する方法に関するものであり、特に、内周面が焼き入れされた貫通孔構成部材の製造方法に関するものである。   The present invention relates to a method of manufacturing a through-hole constituent member, for example, represented by a main constituent member of a ball nut, and more particularly to a method of manufacturing a through-hole constituent member having an inner peripheral surface quenched. It is.

送り装置や、ガイド装置として、ボールネジとボールナットの組み合わせが多用されている。ここでボールネジは、外周面に螺旋溝（ボルト側螺旋溝）が形成された部材である。ボールナットは、前記したボールネジを雄ねじに見立てた場合にナットに相当する働きをする部材であり、図１、図２の様な主要構成部材（貫通孔構成部材）１を備えている。ボールナットの主要構成部材（以下、単にボールナット１と称する）には、ボールネジが貫通する貫通孔２が設けられている。そして当該貫通孔２の内周面３には、ボールネジと同様に螺旋溝（ナット側螺旋溝）５が形成されている。またボールナット１には、内周面３に連通する連通孔６，６’、及び連通孔７，７’が設けられている。そして連通孔６，６’、及び連通孔７，７’を介して螺旋溝５が環状に連結されている（環状構造は図示せず）。   A combination of a ball screw and a ball nut is often used as a feeding device or a guide device. Here, the ball screw is a member in which a spiral groove (bolt side spiral groove) is formed on the outer peripheral surface. The ball nut is a member that functions as a nut when the above-described ball screw is regarded as a male screw, and includes a main component member (through-hole component member) 1 as shown in FIGS. A main component of the ball nut (hereinafter simply referred to as the ball nut 1) is provided with a through hole 2 through which the ball screw passes. And the spiral groove (nut side spiral groove) 5 is formed in the internal peripheral surface 3 of the said through-hole 2 similarly to a ball screw. The ball nut 1 is provided with communication holes 6 and 6 ′ communicating with the inner peripheral surface 3 and communication holes 7 and 7 ′. And the spiral groove 5 is connected cyclically | annularly via the communicating holes 6 and 6 'and the communicating holes 7 and 7' (annular structure is not shown).

そしてボールネジはボールナット１の貫通孔２に挿入され、ボールナット１の螺旋溝５と、ボールネジの螺旋溝（図示せず）とで構成される空間に複数の鋼玉（図示せず）が配されている。
ボールネジ又はボールナット１の一方を回転し、他方の回転を阻止すると、ボールネジとボールナット１は、あたかもボルトとナットの関係の様に軸方向に相対移動する。
ボールネジとボールナット１は、鋼玉を介して接しており、両者の間の摩擦は鋼玉の転がり摩擦のみとなる。そのため両者の間の摩擦抵抗は小さい。
ここで前記した複数の鋼玉は、転がることによってそれ自身が移動するが、前記した様にボールナット１には、内周面３に連通する連通孔６，６’、及び連通孔７，７’が設けられ、当該連通孔６，６’、及び連通孔７，７’を介して螺旋溝５が環状に連結されているから、鋼玉はこの連通孔６，６’、及び連通孔７，７’を通過して循環する。そのため鋼玉が外にこぼれ落ちることはない。 The ball screw is inserted into the through hole 2 of the ball nut 1, and a plurality of steel balls (not shown) are arranged in a space formed by the spiral groove 5 of the ball nut 1 and the spiral groove (not shown) of the ball screw. ing.
When one of the ball screw or the ball nut 1 is rotated and the rotation of the other is prevented, the ball screw and the ball nut 1 are moved relative to each other in the axial direction as if they are bolts and nuts.
The ball screw and the ball nut 1 are in contact with each other via a steel ball, and the friction between them is only the rolling friction of the steel ball. Therefore, the frictional resistance between them is small.
Here, the plurality of steel balls move themselves by rolling. As described above, the ball nut 1 has communication holes 6 and 6 ′ communicating with the inner peripheral surface 3 and communication holes 7 and 7 ′. Are provided, and the spiral groove 5 is connected in an annular shape through the communication holes 6 and 6 'and the communication holes 7 and 7', so that the steel balls are connected to the communication holes 6 and 6 'and the communication holes 7 and 7 respectively. Cycle through '. Therefore, the steel balls do not spill out.

ところで、ボールナット１は内周面３に螺旋溝（ナット側螺旋溝）５があり、当該溝内を鋼玉が通過するから、ボールナット１の内周面３は、焼き入れを施して硬度を高めておく必要がある。
しかしながら、ボールナット１の内周面３を高周波焼き入れすると、連通孔６，６’、及び連通孔７，７’の内側面側端部の鋭角部分１０（図２）が過剰に加熱されてしまう。即ち図２の様に、連通孔６，６’、及び連通孔７，７’は、ナット側螺旋溝５に対して接線方向に設けられる。そのため連通孔６，６’、及び連通孔７，７’の端部は図２の様に傾斜形状となり、連通孔６，６’、及び連通孔７，７’の端部であって、図面下側の部位は、内周面３の円弧に対して接線でも中心線でもない部位で接する。その結果、連通孔６，６’、及び連通孔７，７’の端部であって、図面下側の部位は、断面形状が鋭角状となり、鋭角部分１０はその先端の肉厚が極端に薄いものとなる。 By the way, since the ball nut 1 has a spiral groove (nut-side spiral groove) 5 on the inner peripheral surface 3 and the steel balls pass through the groove, the inner peripheral surface 3 of the ball nut 1 is hardened by hardening. It needs to be raised.
However, when the inner peripheral surface 3 of the ball nut 1 is induction-quenched, the acute angle portion 10 (FIG. 2) at the end on the inner surface side of the communication holes 6 and 6 ′ and the communication holes 7 and 7 ′ is excessively heated. End up. That is, as shown in FIG. 2, the communication holes 6, 6 ′ and the communication holes 7, 7 ′ are provided tangential to the nut side spiral groove 5. Therefore, the end portions of the communication holes 6, 6 'and the communication holes 7, 7' are inclined as shown in FIG. 2, and are the end portions of the communication holes 6, 6 'and the communication holes 7, 7'. The lower part contacts the arc of the inner peripheral surface 3 at a part that is neither a tangent nor a center line. As a result, the end portions of the communication holes 6, 6 ′ and the communication holes 7, 7 ′, and the lower part of the drawing have an acute cross section, and the acute angle portion 10 has an extremely thick tip. It will be thin.

そしてこの様な断面形状のボールナット１の内周面３を高周波焼き入れすると、鋭角部分１０に誘導電流が集中し、鋭角部分１０が他の部位に比べて高い温度に昇温する。そのため高周波焼き入れの加熱時間等が長すぎると連通孔６，６’、及び連通孔７，７’の鋭角部分１０が溶融してしまう。逆に加熱時間等が短いと、他の部位の昇温が不十分となり、満足する硬度に至らない。
そのためボールナット１の内周面３を高周波焼き入れする場合は、細心の注意を要し、加熱時間や電流値、周波数を管理する必要があり、相当に手間を要した。即ちボールナット１の内周面３の高周波焼き入れは、加熱時間や電流値等の許容範囲が狭く、熟練を要し、困難であった。 When the inner peripheral surface 3 of the ball nut 1 having such a cross-sectional shape is induction-quenched, the induced current concentrates on the acute angle portion 10, and the acute angle portion 10 is heated to a higher temperature than other portions. For this reason, if the heating time of induction hardening is too long, the communicating holes 6, 6 'and the acute angle portions 10 of the communicating holes 7, 7' are melted. Conversely, if the heating time or the like is short, the temperature rise at other sites is insufficient, and satisfactory hardness is not achieved.
Therefore, when the inner peripheral surface 3 of the ball nut 1 is subjected to induction hardening, it is necessary to pay close attention, and it is necessary to manage the heating time, current value, and frequency. That is, induction hardening of the inner peripheral surface 3 of the ball nut 1 has been difficult because it has a narrow tolerance for heating time, current value, etc., requires skill.

特許文献１は、この問題を解決するものであり、高周波加熱を行う際に、連通孔６，６’、及び連通孔７，７’に所定形状のプラグを挿入するものである。   Patent Document 1 solves this problem, and inserts plugs of a predetermined shape into the communication holes 6 and 6 ′ and the communication holes 7 and 7 ′ when performing high-frequency heating.

特開２００１−１９２７３４号公報JP 2001-192734 A

特許文献１に開示された方策は、鋭角部分１０が過剰に加熱されることを阻止することができるものの、連通孔６，６’、及び連通孔７，７’にプラグを挿入する作業を要し、かえって煩わしい。   Although the measure disclosed in Patent Document 1 can prevent the acute angle portion 10 from being heated excessively, it requires an operation of inserting plugs into the communication holes 6 and 6 ′ and the communication holes 7 and 7 ′. However, it is rather annoying.

そこで本発明は、従来技術の上記した問題点に注目し、熱処理を行う際の加熱時間や電流値、周波数等の許容範囲が広く、自動化に寄与する貫通孔構成部材の製造方法を提供することを課題とする。   Accordingly, the present invention provides a method for manufacturing a through-hole component member that contributes to automation by paying attention to the above-described problems of the prior art and having a wide allowable range of heating time, current value, frequency, etc. during heat treatment. Is an issue.

上記した課題を解決するための請求項１に記載の発明は、鋼材を素材とし、軸方向に貫通する貫通孔を有し、その貫通孔の内周面に溝が形成された貫通孔構成部材であって、貫通孔構成部材の外面側と内周面とを連通する連通孔を有し、且つ前記内周面が焼き入れ処理された貫通孔構成部材を製造する貫通孔構成部材の製造方法において、内周面に溝が形成され且つ前記連通孔を不完全な状態に穿孔した中間製品を成形し、前記不完全な状態の孔は、以下の（１）（２）（３）のいずれかであり、当該中間製品の内周面を誘導加熱した後に、前記連通孔を仕上げることを特徴とする貫通孔構成部材の製造方法である。
（１）孔が外周面側から穿孔されているが内周面側には不貫通であり、且つ当該孔の深さは孔の奥の壁が誘導加熱の際に焼き入れされる深さである。
（２）孔が外周面側から穿孔されているが内周面側にはその一部だけが貫通している。
（３）連通孔の位置に正規の連通孔よりも小径の孔が設けられ当該孔は外周面から内周面にかけて貫通している。 The invention according to claim 1 for solving the above-described problem is a through-hole constituting member having a through hole penetrating in the axial direction and made of a steel material, and having a groove formed on the inner peripheral surface of the through hole. A method for manufacturing a through-hole component member, which has a communication hole that communicates the outer surface side of the through-hole component member with the inner peripheral surface, and manufactures the through-hole component member in which the inner peripheral surface is quenched. And forming an intermediate product in which a groove is formed on the inner peripheral surface and the communication hole is formed in an incomplete state. The incomplete state hole is formed by any of the following (1), (2), and (3): In addition , after the inner peripheral surface of the intermediate product is induction-heated, the communication hole is finished, and this is a method for manufacturing a through-hole component member.
(1) The hole is perforated from the outer peripheral surface side but is not penetrating the inner peripheral surface side, and the depth of the hole is a depth at which the inner wall of the hole is quenched during induction heating. is there.
(2) The hole is drilled from the outer peripheral surface side, but only a part of the hole penetrates the inner peripheral surface side.
(3) A hole having a smaller diameter than the regular communication hole is provided at the position of the communication hole, and the hole penetrates from the outer peripheral surface to the inner peripheral surface.

本発明の貫通孔構成部材の製造方法では、連通孔を不完全な状態に穿孔した中間製品を成形し、この中間製品の内周面を誘導加熱する。その結果、貫通孔の内周面を均質に加熱することができる。
そしてその後に、連通孔を仕上げる。 In the manufacturing method of the through-hole constituent member of the present invention, an intermediate product in which the communication holes are incompletely formed is formed, and the inner peripheral surface of the intermediate product is induction-heated. As a result, the inner peripheral surface of the through hole can be heated uniformly.
After that, the communication hole is finished.

「連通孔を不完全な状態に穿孔」する例として、連通孔が外周面側から穿孔されているが内周面側には不貫通である場合があげられる。   As an example of “perforating the communication hole in an incomplete state”, there is a case where the communication hole is drilled from the outer peripheral surface side but not through the inner peripheral surface side.

この構成によると、中間製品の段階では、連通孔が内周面側に貫通していない。そのため中間製品の内周面は、一様であり、連通孔が開口すべき部位についても他の部位と変わりはない。そのため内周面を誘導加熱しても、誘導電流の局部的集中は起きない。即ち、中間製品は、連通孔が不完全な状態であるから、そもそも鋭角部分１０はない。そのため内周面を誘導加熱しても、誘導電流の局部的集中は起きない。その結果、貫通孔の内周面を均質に加熱することができる。   According to this configuration, the communication hole does not penetrate to the inner peripheral surface side at the intermediate product stage. Therefore, the inner peripheral surface of the intermediate product is uniform, and the part where the communication hole should open is not different from other parts. Therefore, even if the inner peripheral surface is induction-heated, local concentration of the induced current does not occur. That is, since the intermediate product is in a state where the communication hole is incomplete, there is no acute angle portion 10 in the first place. Therefore, even if the inner peripheral surface is induction-heated, local concentration of the induced current does not occur. As a result, the inner peripheral surface of the through hole can be heated uniformly.

また「連通孔を不完全な状態に穿孔」するもう一つの例として、連通孔が外周面側から穿孔されているが内周面側にその一部だけが貫通している場合があげられる。   Another example of “perforating the communication hole in an incomplete state” is a case where the communication hole is formed from the outer peripheral surface side, but only a part of the communication hole penetrates the inner peripheral surface side.

本構成では、連通孔の一部だけが貫通しているので、貫通部分の周囲には誘導電流が集中し、過剰に加熱される。しかしながら、その周囲については、他の大部分の部位と同様に誘導加熱され、適度の温度に昇温する。
本発明では、熱処理を施した後に、連通孔を仕上げるので、その際に過剰に加熱された部位が除去される。
本発明によると、連通孔を仕上げる際に除去される部位は少なく、作業は容易である。 In this configuration, since only a part of the communication hole penetrates, the induced current concentrates around the penetrating part and is heated excessively. However, the surroundings are induction-heated in the same manner as most other parts, and the temperature is raised to an appropriate temperature.
In the present invention, after the heat treatment is performed, the communication hole is finished, and thus the excessively heated portion is removed.
According to the present invention, there are few parts removed when finishing the communication hole, and the operation is easy.

また「連通孔を不完全な状態に穿孔」するさらにもう一つの例として、連通孔の位置に正規の連通孔よりも小径の孔が設けられたものである場合があげられる。   Another example of “perforating the communication hole in an incomplete state” is a case where a hole having a smaller diameter than the regular communication hole is provided at the position of the communication hole.

本構成では、連通孔の位置に正規の連通孔よりも小径の孔が設けられたものであるから孔の端部は過剰に加熱される。しかしながら、その周囲については、他の大部分の部位と同様に誘導加熱され、適度の温度に昇温する。
本発明では、熱処理を施した後に、連通孔を仕上げるので、その際に過剰に加熱された部位が除去される。 In this configuration, since the hole having a smaller diameter than the regular communication hole is provided at the position of the communication hole, the end of the hole is heated excessively. However, the surroundings are induction-heated in the same manner as most other parts, and the temperature is raised to an appropriate temperature.
In the present invention, after the heat treatment is performed, the communication hole is finished, and thus the excessively heated portion is removed.

誘導加熱は、中間製品の内周面に誘導コイルを近接し、当該誘導コイルに高周波電流を流して中間製品の内周面を加熱する方策が推奨される。そして加熱後に中間製品の内周面を急冷する工程を含むことが推奨される。   For induction heating, a method is recommended in which an induction coil is brought close to the inner peripheral surface of the intermediate product, and a high-frequency current is passed through the induction coil to heat the inner peripheral surface of the intermediate product. It is recommended to include a step of rapidly cooling the inner peripheral surface of the intermediate product after heating.

また誘導加熱は、中間製品の内周面に誘導コイルを近接して行い、前記誘導加熱によって内周面の連通孔に対応する部位も他の部位と同様に昇温させ、その後に中間製品の内周面を急冷し、さらにその後に前記連通孔を仕上げる方策（請求項２）が推奨される。   Further, induction heating is performed by bringing an induction coil close to the inner peripheral surface of the intermediate product, and the temperature corresponding to the communication hole on the inner peripheral surface is increased by the induction heating in the same manner as other portions, and then the intermediate product is heated. A measure (Claim 2) for rapidly cooling the inner peripheral surface and then finishing the communication hole is recommended.

誘導加熱は、中間製品の内周面に誘導コイルを近接して行い、前記誘導加熱を行う際に連通孔を冷却し、内周面の連通孔に対応する部位の昇温を他の部位に比べて抑え、その後に中間製品の内周面を急冷し、さらにその後に前記連通孔を仕上げる方策（請求項３）も推奨される。   Induction heating is performed by bringing an induction coil close to the inner peripheral surface of the intermediate product, cooling the communication hole when performing the induction heating, and raising the temperature of the part corresponding to the communication hole on the inner peripheral surface to other parts. A measure (Claim 3) is also recommended in which the inner peripheral surface of the intermediate product is rapidly cooled and then the communication hole is finished after that.

本発明によると、誘導加熱の際に連通孔が冷却されるので、内周面の連通孔に対応する部位の昇温が抑えられる。そのため内周面の連通孔に対応する部位には焼き入れが入らない。即ち焼き入れは、鉄鋼を一定以上の温度に昇温させ、その後に急冷することによって硬度を上げる技術であるが、本発明によると、内周面の連通孔に対応する部位は、焼き入れに要する温度まで昇温しない。そのため内周面の連通孔に対応する部位は、硬度が低く、連通孔を仕上げる工程が容易となる。 According to the present invention, since the communication hole is cooled during induction heating, the temperature rise of the portion corresponding to the communication hole on the inner peripheral surface can be suppressed. Therefore, quenching does not occur in the portion corresponding to the communication hole on the inner peripheral surface. That is, quenching is a technique for increasing the hardness by raising the temperature of steel to a certain temperature and then rapidly cooling it. According to the present invention, the portion corresponding to the communication hole on the inner peripheral surface is subjected to quenching. Do not heat up to the required temperature. Therefore, the site | part corresponding to the communicating hole of an internal peripheral surface has low hardness, and the process of finishing a communicating hole becomes easy.

本発明は、ボールナットの様な貫通孔構成部材を誘導加熱によって熱処理することができ、且つその際の加熱時間や電流値、周波数等の許容範囲が広い。そのため本発明によると、貫通孔構成部材の熱処理を自動で行うこともできる。   In the present invention, a through-hole component such as a ball nut can be heat-treated by induction heating, and the allowable range of heating time, current value, frequency, etc. at that time is wide. Therefore, according to the present invention, the heat treatment of the through hole constituent member can be automatically performed.

本発明及び従来技術によって製造されたボールナットの主要構成部材の斜視図である。It is a perspective view of the main components of a ball nut manufactured by the present invention and the prior art. 図１のボールナットの主要構成部材の断面図である。It is sectional drawing of the main structural member of the ball nut of FIG. 本発明の第１実施形態の工程を示すボールナットの主要構成部材の中間製品の断面図である。It is sectional drawing of the intermediate product of the main structural member of a ball nut which shows the process of 1st Embodiment of this invention. 本発明の第１実施形態の次の工程を示すボールナットの主要構成部材の中間製品の断面図である。It is sectional drawing of the intermediate product of the main structural member of a ball nut which shows the next process of 1st Embodiment of this invention. 本発明の第１実施形態のさらに次の工程を示す誘導コイルとボールナットの主要構成部材の中間製品の斜視図である。It is a perspective view of the intermediate product of the main components of the induction coil and ball nut which shows the further next process of a 1st embodiment of the present invention. 本発明の第１実施形態の図５に示す工程におけるボールナットの主要構成部材の中間製品の断面図である。It is sectional drawing of the intermediate product of the main structural member of a ball nut in the process shown in FIG. 5 of 1st Embodiment of this invention. 図６に示すボールナットの主要構成部材の中間製品の断面図であり、温度上昇領域を網掛けで表示した断面図である。It is sectional drawing of the intermediate product of the main structural members of the ball nut shown in FIG. 6, and is sectional drawing which displayed the temperature rise area | region by the mesh. 本発明の第１実施形態のさらに次の工程を示すボールナットの主要構成部材の中間製品の断面図である。It is sectional drawing of the intermediate product of the main structural member of a ball nut which shows the further next process of 1st Embodiment of this invention. 本発明の第１実施形態のさらに次の工程を示すボールナットの主要構成部材の中間製品の断面図である。It is sectional drawing of the intermediate product of the main structural member of a ball nut which shows the further next process of 1st Embodiment of this invention. 本発明の第２実施形態の工程を示すボールナットの主要構成部材の中間製品の断面図である。It is sectional drawing of the intermediate product of the main structural member of a ball nut which shows the process of 2nd Embodiment of this invention. 図１０のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 本発明の第３実施形態の工程を示すボールナットの主要構成部材の中間製品の断面図である。It is sectional drawing of the intermediate product of the main structural member of a ball nut which shows the process of 3rd Embodiment of this invention. 本発明の第３実施形態の次の工程を示すボールナットの主要構成部材の中間製品の断面図である。It is sectional drawing of the intermediate product of the main structural member of a ball nut which shows the next process of 3rd Embodiment of this invention. 本発明の第４実施形態のボールナットの主要構成部材の中間製品の断面図であり、内面を加熱する際の様子を示すと共に温度上昇領域を網掛けで表示した断面図である。It is sectional drawing of the intermediate product of the main structural member of the ball nut of 4th Embodiment of this invention, and is a sectional view which showed the mode at the time of heating an inner surface, and displayed the temperature rise area | region with the mesh.

以下さらに本発明の実施形態について説明する。
本実施形態は、図１、図２に示すようなボールナット（正確にはボールナットの主要構成部材）１を製造するものである。
ボールナット１の外観形状は、図１の通りであり、一端側にフランジ部２０が設けられた円筒形をしている。即ちボールナット１の外観形状は円筒形の本体部２１と、一端側に形成されたフランジ部２０によって構成されている。 Embodiments of the present invention will be further described below.
In the present embodiment, a ball nut (more precisely, a main component of the ball nut) 1 as shown in FIGS. 1 and 2 is manufactured.
The external shape of the ball nut 1 is as shown in FIG. 1 and has a cylindrical shape with a flange portion 20 provided on one end side. That is, the external shape of the ball nut 1 is constituted by a cylindrical main body portion 21 and a flange portion 20 formed on one end side.

本体部２１は、その中間部に大きな面取り部２２が形成されている。
またボールナット１には軸方向に貫通する貫通孔２が形成されている。貫通孔２の内周面３には前記した螺旋溝（ナット側螺旋溝）５が設けられている。 The main body portion 21 is formed with a large chamfered portion 22 at an intermediate portion thereof.
The ball nut 1 is formed with a through hole 2 penetrating in the axial direction. The spiral groove (nut-side spiral groove) 5 described above is provided on the inner peripheral surface 3 of the through hole 2.

そしてボールナット１の外周面側から内周面３の螺旋溝（ナット側螺旋溝）５に至る連通孔６，７が設けられている。連通孔６，７は、いずれも面取り部２２から穿孔されたものであり、その先端は、内周面３の螺旋溝（ナット側螺旋溝）５に開いている。連通孔６’，７’も連通孔６，７と同様であり、以下において連通孔６’，７’に関する重複する記述は省略する。   Communication holes 6 and 7 extending from the outer peripheral surface side of the ball nut 1 to the spiral groove (nut-side spiral groove) 5 of the inner peripheral surface 3 are provided. Each of the communication holes 6 and 7 is drilled from the chamfered portion 22, and the tip thereof is open to the spiral groove (nut-side spiral groove) 5 of the inner peripheral surface 3. The communication holes 6 ′ and 7 ′ are the same as the communication holes 6 and 7, and redundant descriptions regarding the communication holes 6 ′ and 7 ′ are omitted below.

次に、ボールナット１の製造方法について説明する。
ボールナット１は、焼き入れ可能な鋼で成形されたものであり、先ず外観形状が成形される。即ち本体部２１とフランジ部２０が成形され、本体部２１の中間部に面取り部２２が形成される。また内周面３に螺旋溝（ナット側螺旋溝）５が形成される。 Next, a method for manufacturing the ball nut 1 will be described.
The ball nut 1 is formed of quenchable steel, and first, the external shape is formed. That is, the main body portion 21 and the flange portion 20 are formed, and the chamfered portion 22 is formed in the middle portion of the main body portion 21. A spiral groove (nut side spiral groove) 5 is formed on the inner peripheral surface 3.

そして図３の様に、面取り部２２にドリル３０又はミルを当接し、連通孔６，７を穿孔する。ただし連通孔６，７は貫通させず、図４に示すように、数ミリを残して穴形成を終える。即ち連通孔６，７は、奥に壁２５を残す状態となっている。   Then, as shown in FIG. 3, the drill 30 or the mill is brought into contact with the chamfered portion 22 to drill the communication holes 6 and 7. However, the communication holes 6 and 7 are not allowed to pass through, and as shown in FIG. That is, the communication holes 6 and 7 are in a state in which the wall 25 is left behind.

続いて、図５、図６の様に、貫通孔２に誘導コイル３１を挿入し、貫通孔２の内周面３を高周波誘導加熱する。
より具体的には、誘導コイル３１を挿入し、誘導コイル３１が貫通孔２の内周面３に近接した状態で、誘導コイル３１に高周波電流を流す。そしてボールナット１を誘導コイル３１に対して相対回転させる。その結果、貫通孔２の内周面３に誘導電流が励起され、貫通孔２の内周面３が赤熱する。
ここで本実施形態では、ボールナット１の中間製品は、連通孔６，７が貫通しておらず、貫通孔２の内周面３の形状は一様である。そのため貫通孔２の内周面３には、均一に誘導電流が励起され、貫通孔２の内周面３が均一に赤熱する。 Subsequently, as shown in FIGS. 5 and 6, the induction coil 31 is inserted into the through-hole 2, and the inner peripheral surface 3 of the through-hole 2 is heated by high frequency induction.
More specifically, the induction coil 31 is inserted, and a high-frequency current is passed through the induction coil 31 in a state where the induction coil 31 is close to the inner peripheral surface 3 of the through hole 2. Then, the ball nut 1 is rotated relative to the induction coil 31. As a result, an induced current is excited on the inner peripheral surface 3 of the through hole 2, and the inner peripheral surface 3 of the through hole 2 is red hot.
Here, in this embodiment, the intermediate product of the ball nut 1 does not penetrate the communication holes 6 and 7, and the shape of the inner peripheral surface 3 of the through hole 2 is uniform. Therefore, an induced current is uniformly excited on the inner peripheral surface 3 of the through hole 2, and the inner peripheral surface 3 of the through hole 2 is uniformly red hot.

即ち図７に示す様に、前記誘導加熱によって内周面３の連通孔６，７に対応する部位２７も他の部位と同様に昇温する。ただし、連通孔６，７に対応する部位２７は、他の部位に比べて肉厚が薄いので、昇温領域の深さが他の部位に比べてやや深くなり、壁２５は、全体的に昇温領域に含まれることとなる。   That is, as shown in FIG. 7, the temperature of the portion 27 corresponding to the communication holes 6 and 7 on the inner peripheral surface 3 is raised by the induction heating in the same manner as other portions. However, since the portion 27 corresponding to the communication holes 6 and 7 is thinner than the other portions, the depth of the temperature rising region is slightly deeper than the other portions, and the wall 25 is entirely formed. It will be included in the temperature rising region.

続いて図８の様に、貫通孔２に冷却ジャケット３２を挿入し、冷却ジャケット３２から冷却水を噴射して貫通孔２の内周面３を急冷する。
その後、必要に応じて焼き戻しを行う。 Subsequently, as shown in FIG. 8, a cooling jacket 32 is inserted into the through hole 2, and cooling water is injected from the cooling jacket 32 to rapidly cool the inner peripheral surface 3 of the through hole 2.
Thereafter, tempering is performed as necessary.

その結果、貫通孔２の内周面３が均一に焼き入れされ、内周面３が均質なボールナット１の中間製品が完成する。   As a result, the inner peripheral surface 3 of the through-hole 2 is uniformly quenched, and an intermediate product of the ball nut 1 having a uniform inner peripheral surface 3 is completed.

そして続く工程で、連通孔６，７を仕上げる。具体的には、連通孔６，７に再度ドリル３０又はミルを挿入し、連通孔６，７の奥の壁２５を突き破る。ここで連通孔６，７の奥の壁２５は、焼き入れされていて硬いが、厚さは薄い。そのため連通孔６，７の奥の壁２５は、容易に突き破られ、連通孔６，７が開通する。
その結果、図１，２に示す形状であって、内周面３が焼き入れされたボールナット１が完成する。 In the subsequent process, the communication holes 6 and 7 are finished. Specifically, the drill 30 or the mill is inserted into the communication holes 6 and 7 again to break through the wall 25 behind the communication holes 6 and 7. Here, the inner walls 25 of the communication holes 6 and 7 are hardened and hard, but the thickness is thin. Therefore, the inner wall 25 of the communication holes 6 and 7 is easily pierced, and the communication holes 6 and 7 are opened.
As a result, the ball nut 1 having the shape shown in FIGS. 1 and 2 and having the inner peripheral surface 3 quenched is completed.

以上説明した実施形態では、ドリル３０又はミルによって連通孔６，７を開通させたが、ポンチやタガネの様な打撃や衝撃を加える工具を使用して連通孔６，７を開通させてもよい。   In the embodiment described above, the communication holes 6 and 7 are opened by the drill 30 or the mill. However, the communication holes 6 and 7 may be opened using a tool that applies impact or impact such as a punch or a chisel. .

また以上説明した実施形態では、連通孔６，７を貫通させない状態で、熱処理を行ったが、図１０、図１１の様に連通孔６，７の奥の壁２５に小孔３３があいていてもよい。
即ち公知のドリル３０は、先端が尖っているが、図１０、図１１の様に、ドリル３０の一部たる先端部分だけが内周面３側に貫通し、ドリル３０の周部は不貫通の状態であってもよい。 In the embodiment described above, the heat treatment is performed without penetrating the communication holes 6 and 7. However, as shown in FIGS. 10 and 11, the small hole 33 is formed in the wall 25 at the back of the communication holes 6 and 7. May be.
That is, the known drill 30 has a sharp tip, but as shown in FIGS. 10 and 11, only the tip portion that is a part of the drill 30 penetrates to the inner peripheral surface 3 side, and the peripheral portion of the drill 30 does not penetrate. It may be in the state.

この場合においても、熱処理に続く工程で、連通孔６，７を仕上げる。具体的には、連通孔６，７に再度ドリル３０又はミルを挿入し、連通孔６，７の奥の壁２５の縁部分を突き破る。ドリル３０等に代わってポンチやタガネの様な打撃や衝撃を加える工具を使用して連通孔６，７を開通させてもよい。   Even in this case, the communication holes 6 and 7 are finished in the process following the heat treatment. Specifically, the drill 30 or the mill is inserted again into the communication holes 6 and 7, and the edge portion of the wall 25 at the back of the communication holes 6 and 7 is broken through. Instead of the drill 30 or the like, the communication holes 6 and 7 may be opened using a tool that applies impact or impact such as a punch or a chisel.

また先の実施形態では、熱処理を施す前に形成される連通孔６，７は、その直径が最終的な連通孔６，７のそれと略等しいものであるが、これよりも小さい連通孔３５，３６を設けてもよい。
即ち図１２の様に小径のドリル（図示せず）で、連通孔３５，３６を設ける。この連通孔３５，３６は、外周側から内周面３にかけて貫通する。
そしてこの状態で、熱処理し、続く工程で、連通孔６，７を仕上げる。
即ち図１３に示すように、連通孔３５，３６に正規の太さのドリル３０又はミル、あるいはリーマを挿入し、連通孔３５，３６を拡径する。ここで、本実施形態では、焼き入れによって硬化されているのは、内周面３の近傍のみであり、外周部の硬度は低いから、ドリル３０等の挿通は容易である。また内周面３の近傍は硬いが、硬化層は薄いから、ドリル３０等の抵抗は小さい。 In the previous embodiment, the communication holes 6 and 7 formed before the heat treatment are substantially the same in diameter as those of the final communication holes 6 and 7, but the communication holes 35 and 36 may be provided.
That is, the communication holes 35 and 36 are provided by a small diameter drill (not shown) as shown in FIG. The communication holes 35 and 36 penetrate from the outer peripheral side to the inner peripheral surface 3.
In this state, heat treatment is performed, and the communication holes 6 and 7 are finished in a subsequent process.
That is, as shown in FIG. 13, a regular diameter drill 30 or mill or reamer is inserted into the communication holes 35, 36 to expand the communication holes 35, 36. Here, in this embodiment, only the vicinity of the inner peripheral surface 3 is hardened by quenching, and since the hardness of the outer peripheral portion is low, the drill 30 or the like can be easily inserted. Moreover, although the vicinity of the inner peripheral surface 3 is hard, since the hardened layer is thin, the resistance of the drill 30 or the like is small.

また前記した実施形態は、いずれも壁２５や、内周面３の連通孔６，７に対応する部位２７を誘導加熱の際に昇温させる方策を採用するが、壁２５や、連通孔６，７に対応する部位２７を昇温させないでおく方策も考えられる。例えば図１４に示す様に、貫通孔２の内周面３を高周波誘導加熱する際に、ノズル２８から連通孔６，７に冷却水や冷風を吹き付け、壁２５やその周辺の昇温を抑える。その結果、内周面３の連通孔６，７に対応する部位２７は焼き入れに必要な温度に達せず、いわゆる「生」の状態となる。即ち内周面３の連通孔６，７に対応する部位２７は、マルテンサイト化せず、硬度が上がらない。
本実施形態においても、高周波誘導加熱の後に、図８の様に急冷し、さらに図９の様に連通孔６，７を仕上げる。本実施形態による場合は、壁２５の硬度が低いので、連通孔６，７を容易に仕上げることができる。 In the above-described embodiments, the wall 25 and the portion 27 corresponding to the communication holes 6 and 7 on the inner peripheral surface 3 are heated at the time of induction heating. , 7 can be considered to prevent the temperature of the portion 27 corresponding to. For example, as shown in FIG. 14, when the inner peripheral surface 3 of the through-hole 2 is subjected to high-frequency induction heating, cooling water or cold air is blown from the nozzle 28 to the communication holes 6 and 7 to suppress the temperature rise in the wall 25 and its surroundings. . As a result, the portion 27 corresponding to the communication holes 6 and 7 on the inner peripheral surface 3 does not reach the temperature required for quenching, and is in a so-called “raw” state. That is, the portion 27 corresponding to the communication holes 6 and 7 on the inner peripheral surface 3 does not become martensite and does not increase in hardness.
Also in this embodiment, after the high frequency induction heating, rapid cooling is performed as shown in FIG. 8, and the communication holes 6 and 7 are finished as shown in FIG. In the case of this embodiment, since the hardness of the wall 25 is low, the communication holes 6 and 7 can be easily finished.

以上説明した実施形態によると、ボールナット１の様な、鋼材を素材とし、軸方向に貫通する貫通孔を有し、その貫通孔の内周面に溝が形成された貫通孔構成部材であって、外面側と内周面を連通する連通孔を有し、且つ前記内周面が焼き入れ処理された貫通孔構成部材を容易に製造することができる。   According to the embodiment described above, it is a through-hole constituent member such as the ball nut 1 that is made of steel and has a through-hole penetrating in the axial direction, and a groove is formed on the inner peripheral surface of the through-hole. Thus, it is possible to easily manufacture a through-hole constituent member having a communication hole that communicates the outer surface side with the inner peripheral surface and the inner peripheral surface is quenched.

１ ボールナット（貫通孔構成部材）
２ 貫通孔
５ 螺旋溝（ナット側螺旋溝）
６，６’，７，７’ 連通孔
２１ 本体部
２５ 壁
２７ 連通孔に対応する部位
２８ ノズル
３１ 誘導コイル
３３ 小孔
３５，３６ 連通孔 1 Ball nut (Through hole component)
2 Through-hole 5 Spiral groove (nut-side spiral groove)
6,6 ', 7,7' communicating hole 21 main body 25 wall 27 portion 28 corresponding to communicating hole nozzle 31 induction coil 33 small hole 35, 36 communicating hole

Claims (3)

鋼材を素材とし、軸方向に貫通する貫通孔を有し、その貫通孔の内周面に溝が形成された貫通孔構成部材であって、貫通孔構成部材の外面側と内周面とを連通する連通孔を有し、且つ前記内周面が焼き入れ処理された貫通孔構成部材を製造する貫通孔構成部材の製造方法において、
内周面に溝が形成され且つ前記連通孔を不完全な状態に穿孔した中間製品を成形し、
前記不完全な状態の孔は、以下の（１）（２）（３）のいずれかであり、
当該中間製品の内周面を誘導加熱した後に、前記連通孔を仕上げることを特徴とする貫通孔構成部材の製造方法。
（１）孔が外周面側から穿孔されているが内周面側には不貫通であり、且つ当該孔の深さは孔の奥の壁が誘導加熱の際に焼き入れされる深さである。
（２）孔が外周面側から穿孔されているが内周面側にはその一部だけが貫通している。
（３）連通孔の位置に正規の連通孔よりも小径の孔が設けられ当該孔は外周面から内周面にかけて貫通している。 A through-hole component member made of steel and having a through-hole penetrating in the axial direction and having a groove formed in the inner peripheral surface of the through-hole, the outer surface side and the inner peripheral surface of the through-hole component member In the manufacturing method of a through-hole component member that has a communication hole that communicates, and manufactures a through-hole component member in which the inner peripheral surface is quenched.
Forming an intermediate product in which a groove is formed on the inner peripheral surface and the communication hole is formed in an incomplete state;
The imperfect hole is one of the following (1), (2) and (3) :
A method of manufacturing a through hole constituent member, wherein the communication hole is finished after induction heating of the inner peripheral surface of the intermediate product.
(1) The hole is perforated from the outer peripheral surface side but is not penetrating the inner peripheral surface side, and the depth of the hole is a depth at which the inner wall of the hole is quenched during induction heating. is there.
(2) The hole is drilled from the outer peripheral surface side, but only a part of the hole penetrates the inner peripheral surface side.
(3) A hole having a smaller diameter than the regular communication hole is provided at the position of the communication hole, and the hole penetrates from the outer peripheral surface to the inner peripheral surface. 誘導加熱は、中間製品の内周面に誘導コイルを近接して行い、前記誘導加熱によって内周面の連通孔に対応する部位も他の部位と同様に昇温させ、その後に中間製品の内周面を急冷し、さらにその後に前記連通孔を仕上げることを特徴とする請求項１に記載の貫通孔構成部材の製造方法。   Induction heating is performed by bringing an induction coil close to the inner peripheral surface of the intermediate product, and the part corresponding to the communication hole on the inner peripheral surface is heated by the induction heating in the same manner as other parts. The manufacturing method of the through-hole component member according to claim 1, wherein the peripheral surface is rapidly cooled and then the communication hole is finished. 誘導加熱は、中間製品の内周面に誘導コイルを近接して行い、前記誘導加熱を行う際に連通孔を冷却し、内周面の連通孔に対応する部位の昇温を他の部位に比べて抑え、その後に中間製品の内周面を急冷し、さらにその後に前記連通孔を仕上げることを特徴とする請求項１に記載の貫通孔構成部材の製造方法。   Induction heating is performed by bringing an induction coil close to the inner peripheral surface of the intermediate product, cooling the communication hole when performing the induction heating, and raising the temperature of the part corresponding to the communication hole on the inner peripheral surface to other parts. The method of manufacturing a through-hole component member according to claim 1, wherein the method further comprises suppressing the comparison, thereafter quenching the inner peripheral surface of the intermediate product, and then finishing the communication hole.
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