JPH0560120A - Drilling tapping screw - Google Patents

Drilling tapping screw

Info

Publication number
JPH0560120A
JPH0560120A JP24051391A JP24051391A JPH0560120A JP H0560120 A JPH0560120 A JP H0560120A JP 24051391 A JP24051391 A JP 24051391A JP 24051391 A JP24051391 A JP 24051391A JP H0560120 A JPH0560120 A JP H0560120A
Authority
JP
Japan
Prior art keywords
screw
head
drilling
drill
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP24051391A
Other languages
Japanese (ja)
Inventor
Masahiro Hara
雅博 原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Topura Co Ltd
Original Assignee
Topura Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Topura Co Ltd filed Critical Topura Co Ltd
Priority to JP24051391A priority Critical patent/JPH0560120A/en
Publication of JPH0560120A publication Critical patent/JPH0560120A/en
Pending legal-status Critical Current

Links

Landscapes

  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

PURPOSE:To provide a drilling tapping screw made of austenite stainless steel capable of securing the corrosion resistance at a head section and a screw portion near the head section and having improved hardness near a drill section. CONSTITUTION:No nitride film is formed at the portion A of a drilling tapping screw 1, and a nitride film is formed at the portion B. Nitriding is applied to a drill section 3 and several ridges at the tip of a screw section 2 connected to it, the hardness on the surface is increased, the drilling performance is good, and tapping can be easily applied to a drilled hole. The diameter of the portion A and the diameter of the portion B are practically equal in the complete screw ridge section, thus problems during the fastening work and the breakage of a female screw at the time of fastening are prevented, and stable fastening can be made.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ドリリングタッピンね
じ、特に、オーステナイト系ステンレス鋼製のドリリン
グタッピンねじに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling tapping screw, and more particularly to a drilling tapping screw made of austenitic stainless steel.

【0002】[0002]

【従来の技術】ドリリングタッピンねじは、ねじ込むだ
けで、下穴を開け、ねじ切り、ねじ止めを行なうことが
できる。したがって、作業時間を極めて短縮できるの
で、自動車製造、建築をはじめ、その利用分野は急速に
拡大している。耐食性が要求される分野では、オーステ
ナイト系ステンレス鋼を用いたドリリングタッピンねじ
が知られている。頭部、ねじ部およびドリル部をオース
テナイト系ステンレス鋼で一体成形したものでは、耐食
性に優れているが、オーステナイト系ステンレス鋼の硬
度が低いために、ドリル部の穿孔性能が劣り、厚板鋼板
には使用できないという問題がある。
2. Description of the Related Art A drilling tapping screw can be drilled, threaded and screwed by simply screwing it in. Therefore, the working time can be extremely shortened, and the fields of use thereof such as automobile manufacturing and construction are rapidly expanding. Drilling tapping screws made of austenitic stainless steel are known in fields requiring corrosion resistance. Although the head, screw and drill parts are integrally molded from austenitic stainless steel, they have excellent corrosion resistance, but due to the low hardness of the austenitic stainless steel, the drilling performance of the drill part is poor, making it suitable for thick steel plates. There is a problem that can not be used.

【0003】ドリル部の硬度を高めたドリリングタッピ
ンねじとして、頭部、ねじ部をオーステナイト系ステン
レス鋼製、ドリル部を炭素鋼製にしてドリル部を浸炭焼
入により硬くしたもの、あるいは、頭部、ねじ部および
ドリル部をオーステナイト系ステンレス鋼で一体成形し
た後、全体に窒化処理を施して、表面を硬くし、頭部と
頭部近傍のねじ部分を薬品により窒化層を溶かしたもの
が知られている。窒化処理を施した後に、頭部と頭部近
傍のねじ部分の窒化層を除去するのは、窒化層の耐食性
が低いために、頭部と頭部近傍のねじ部分の窒化層を除
去して、この部分の耐食性を向上させるためである。
As a drilling tapping screw with an increased hardness of the drill part, the head and the screw part are made of austenitic stainless steel, the drill part is made of carbon steel, and the drill part is hardened by carburizing and quenching, or the head part. It is known that the screw part and the drill part are integrally molded with austenitic stainless steel, then the entire surface is nitrided to harden the surface, and the nitrided layer is melted by chemicals on the head and the screw part near the head. Has been. After performing the nitriding treatment, the nitride layer on the head and the screw part near the head is removed.Because the corrosion resistance of the nitride layer is low, the nitride layer on the head and the screw part near the head is removed. This is to improve the corrosion resistance of this part.

【0004】しかしながら、頭部、ねじ部をオーステナ
イト系ステンレス鋼製、ドリル部を炭素鋼製にしてドリ
ル部を浸炭焼入により硬くしたものは、ねじ部とドリル
部との接合方法として、電気的接合、摩擦接合、嵌め合
い的接合等が用いられているが、ねじ部とドリル部との
材質が相違しているため、いずれの接合方法によって
も、接合の安定性がなく、穿孔時に接合部において破断
が生じやすいという問題がある。
However, in the case where the head portion and the screw portion are made of austenitic stainless steel, the drill portion is made of carbon steel and the drill portion is hardened by carburizing and quenching, the screw portion and the drill portion are joined together electrically. Joining, friction joining, mating joining, etc. are used, but because the materials of the screw part and the drill part are different, the joining is not stable by either joining method, and the joining part during drilling There is a problem that breakage easily occurs in.

【0005】また、全体を窒化処理した後に、頭部と頭
部近傍のねじ部分の窒化層を除去したものは、頭部にお
いては、窒化層を溶かすことにより形状が変化し、特
に、十字穴付きねじ等の場合は、締付作業の際に工具が
空転してしまったり、ねじが工具より脱落してしまうと
いう問題がある。頭部近傍のねじ部分においては、窒化
層の除去により、その部分のねじの外径が小さくなり、
締付時にめねじが破壊されてしまうなどの問題がある。
In the case where the nitride layer on the head and the screw portion near the head is removed after the whole is nitrided, the shape of the head is changed by melting the nitride layer. In the case of an attached screw or the like, there is a problem that the tool will idle during the tightening work, or the screw will fall off the tool. In the screw part near the head, the outer diameter of the screw in that part is reduced by removing the nitrided layer,
There is a problem that the female screw is broken during tightening.

【0006】[0006]

【発明が解決しようとする課題】本発明は、上述した事
情に鑑みてなされたもので、頭部と頭部近傍のねじ部分
の耐食性を確保でき、ドリル部近傍における硬度を向上
させたオーステナイト系ステンレス鋼製のドリリングタ
ッピンねじを提供することを目的とするものである。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to ensure the corrosion resistance of the head and the screw portion near the head and to improve the hardness in the vicinity of the drill portion. It is intended to provide a drilling tapping screw made of stainless steel.

【0007】[0007]

【課題を解決するための手段】本発明は、オーステナイ
ト系ステンレス鋼製のドリリングタッピンねじにおい
て、ドリル部と、該ドリル部より連なる完全ねじ山の一
部には、その表面の硬さがHV400以上でありその深
さが40μ以上である窒化処理膜が形成されているとと
もに、他の部分には、窒化処理膜が形成されていないこ
とを特徴とするものである。
According to the present invention, in a drilling tapping screw made of austenitic stainless steel, a surface of a drill portion and a part of a complete thread extending from the drill portion has a surface hardness of HV 400 or more. The nitriding film having a depth of 40 μm or more is formed, and the nitriding film is not formed in other portions.

【0008】したがって、窒化処理膜が形成されていな
い部分の完全ねじ山の径は、窒化処理膜が形成された部
分の完全ネジ山の径と実質的に等しいものである。な
お、窒化処理膜が形成された部分の完全ねじ山は、数山
程度とすることができる。
Therefore, the diameter of the complete screw thread in the portion where the nitriding film is not formed is substantially equal to the diameter of the complete screw thread in the portion where the nitriding film is formed. The complete thread on the part where the nitriding film is formed can be about several threads.

【0009】[0009]

【実施例】図1は、本発明のドリリングタッピンねじの
一実施例の断面図、図2は側面図、図3は平面図であ
る。図中、1は頭部、2はねじ部、3はドリル部であ
り、A部は、窒化膜が形成されていない部分、B部は、
窒化膜が形成された部分である。ドリル部3は、窒化処
理が施されているため、表面の硬度が高くなっており、
穿孔性能が良い。ドリル部3より連なるねじ部2の先端
の数山も窒化処理が施されているため、表面の硬度は同
様に高くなっている。したがって、ドリル部3で穿孔さ
れた孔に、ねじ立てが容易にできる。この表面の硬度
は、ヴィッカース硬度で400以上(HV400以上と
記載する。)、深さ40μ以上が必要である。硬度およ
び深さが上述した値に達しないと、オーステナイト系ス
テンレス鋼材は素材の硬さが低いので、ドリル部での穿
孔時およびねじ部でのねじ立て時に、性能が低下し、厚
板の場合などには、穿孔やねじ立てが不能となることが
ある。また、頭部1および頭部近傍のねじ部は、窒化処
理がされていないため、オーステナイト系ステンレス鋼
材の性質をそのまま有しており、耐食性が良い。なお、
窒化膜が形成された部分Bは、窒化によって僅かな寸法
膨張が見られるが、問題となる程度ではなく、完全ネジ
山部においても、A部分に属する径と、B部分に属する
径とは実質的に等しいため、締付作業時での問題や、締
結時でのめねじ破壊もなく安定した締結のできるドリリ
ングタッピンねじとなる。
1 is a sectional view of an embodiment of the drilling tapping screw of the present invention, FIG. 2 is a side view, and FIG. 3 is a plan view. In the figure, 1 is a head part, 2 is a screw part, 3 is a drill part, A part is a part where a nitride film is not formed, and B part is
This is the portion where the nitride film is formed. Since the drill portion 3 is subjected to nitriding treatment, the surface hardness is high,
Good drilling performance. Since several ridges of the tip of the screw portion 2 connected to the drill portion 3 are also nitrided, the hardness of the surface is similarly high. Therefore, tapping can be easily performed on the hole drilled by the drill portion 3. The surface must have a Vickers hardness of 400 or more (described as HV400 or more) and a depth of 40 μm or more. If the hardness and depth do not reach the above-mentioned values, the hardness of the austenitic stainless steel material is low, so the performance deteriorates when drilling with the drill part and when tapping with the screw part. For example, drilling and tapping may not be possible. In addition, since the head 1 and the screw portion near the head are not nitrided, they have the same properties as an austenitic stainless steel material and have good corrosion resistance. In addition,
A slight dimensional expansion is observed in the portion B where the nitride film is formed by nitriding, but this is not a problem, and even in the complete thread portion, the diameter belonging to the portion A and the diameter belonging to the portion B are substantially the same. Therefore, the drilling tapping screw can be stably fastened without problems during tightening work and without breaking the internal thread during fastening.

【0010】窒化処理は、他の表面処理に比較して、得
られる硬度が高い。処理方法としては、NH4 ガスによ
る方法があるが、処理に長時間を要する。熔融塩による
方法が有利である。
The nitriding treatment has a higher hardness than other surface treatments. As a treatment method, there is a method using NH 4 gas, but the treatment requires a long time. The molten salt method is advantageous.

【0011】窒化膜を頭部と頭部近傍のねじ部分に形成
させない方法としては、その部分を熔錫に浸漬して錫の
薄膜を付ける方法や、その部分にニッケル鍍金を施すな
どにより窒化防止層を形成してをしておき、窒化処理を
すればよい。錫の薄膜やニッケル鍍金層は窒化処理後
に、除去してもよいが、残したままとしておいてもよ
い。
As a method for preventing the nitride film from being formed on the head and the screw portion near the head, nitriding can be prevented by dipping the portion in molten tin and applying a thin film of tin, or by nickel plating on the portion. A layer may be formed, and a nitriding treatment may be performed. The tin thin film or the nickel plating layer may be removed after the nitriding treatment, or may be left as it is.

【0012】[0012]

【発明の効果】以上の説明から明らかなように、本発明
によれば、オーステナイト系ステンレス鋼製のドリリン
グタッピンねじにおいて、穿孔およびねじ立てに必要な
部分に、窒化処理膜が形成されており、その硬度と厚み
が十分であるから、厚板に対しても支障なくねじ止めが
可能であり、また、他の部分には窒化処理膜が形成され
ていないから、オーステナイト系ステンレス鋼の耐食性
を確保することができるという効果がある。
As is apparent from the above description, according to the present invention, in a drilling tapping screw made of austenitic stainless steel, a nitriding film is formed in a portion required for drilling and tapping, Since its hardness and thickness are sufficient, it can be screwed on thick plates without any problem, and since the nitriding film is not formed on other parts, the corrosion resistance of austenitic stainless steel is secured. There is an effect that can be done.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明のドリリングタッピンねじの一実施例の
断面図である。
FIG. 1 is a sectional view of an embodiment of a drilling tapping screw of the present invention.

【図2】図1のドリリングタッピンねじの側面図であ
る。
2 is a side view of the drilling tapping screw of FIG. 1. FIG.

【図3】図1のドリリングタッピンねじの平面図であ
る。
3 is a plan view of the drilling tapping screw of FIG. 1. FIG.

【符号の説明】[Explanation of symbols]

1 頭部 2 ねじ部 3 ドリル部 A 窒化膜が形成されていない部分 B 窒化膜が形成された部分 1 head part 2 screw part 3 drill part A part where a nitride film is not formed B part where a nitride film is formed

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 オーステナイト系ステンレス鋼製のドリ
リングタッピンねじにおいて、ドリル部と、該ドリル部
より連なる完全ねじ山の一部には、その表面の硬さがH
V400以上でありその深さが40μ以上である窒化処
理膜が形成されているとともに、他の部分には、窒化処
理膜が形成されていないことを特徴とするドリリングタ
ッピンねじ。
1. In a drilling tapping screw made of austenitic stainless steel, the hardness of the surface of the drill part and a part of the complete thread connecting the drill part is H.
A drilling tapping screw, characterized in that a nitriding film having a V of 400 or more and a depth of 40 μ or more is formed, and the nitriding film is not formed in other portions.
JP24051391A 1991-08-27 1991-08-27 Drilling tapping screw Pending JPH0560120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24051391A JPH0560120A (en) 1991-08-27 1991-08-27 Drilling tapping screw

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24051391A JPH0560120A (en) 1991-08-27 1991-08-27 Drilling tapping screw

Publications (1)

Publication Number Publication Date
JPH0560120A true JPH0560120A (en) 1993-03-09

Family

ID=17060641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24051391A Pending JPH0560120A (en) 1991-08-27 1991-08-27 Drilling tapping screw

Country Status (1)

Country Link
JP (1) JPH0560120A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1162932A (en) * 1997-08-28 1999-03-05 Manbin:Kk Tapping screw and manufacture thereof
KR100973687B1 (en) * 2008-03-10 2010-08-03 주식회사 아세아볼트 Tapping screw and method of manufacturing thereof
CN110397654A (en) * 2018-04-25 2019-11-01 赛峰起落架系统英国有限公司 Aircraft assembly
CN110468369A (en) * 2018-05-09 2019-11-19 国联螺丝工业股份有限公司 300 series stainless steel screw fasteners nitridation heat treatment processing procedure
EP4286698A1 (en) * 2022-06-03 2023-12-06 Bulten AB Screw

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1162932A (en) * 1997-08-28 1999-03-05 Manbin:Kk Tapping screw and manufacture thereof
KR100973687B1 (en) * 2008-03-10 2010-08-03 주식회사 아세아볼트 Tapping screw and method of manufacturing thereof
CN110397654A (en) * 2018-04-25 2019-11-01 赛峰起落架系统英国有限公司 Aircraft assembly
CN110468369A (en) * 2018-05-09 2019-11-19 国联螺丝工业股份有限公司 300 series stainless steel screw fasteners nitridation heat treatment processing procedure
EP4286698A1 (en) * 2022-06-03 2023-12-06 Bulten AB Screw

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