JPH04219512A - Manufacture of stainless steel drill screw - Google Patents
Manufacture of stainless steel drill screwInfo
- Publication number
- JPH04219512A JPH04219512A JP6129891A JP6129891A JPH04219512A JP H04219512 A JPH04219512 A JP H04219512A JP 6129891 A JP6129891 A JP 6129891A JP 6129891 A JP6129891 A JP 6129891A JP H04219512 A JPH04219512 A JP H04219512A
- Authority
- JP
- Japan
- Prior art keywords
- drill
- treatment
- stainless steel
- shank
- head
- 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.)
- Granted
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 17
- 239000010935 stainless steel Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 27
- 238000010273 cold forging Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 35
- 229910052802 copper Inorganic materials 0.000 claims description 35
- 239000010949 copper Substances 0.000 claims description 35
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 18
- 238000005255 carburizing Methods 0.000 claims description 11
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 10
- 238000007747 plating Methods 0.000 abstract description 52
- 238000005121 nitriding Methods 0.000 abstract description 21
- 229910001566 austenite Inorganic materials 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 229910052759 nickel Inorganic materials 0.000 description 9
- 229910000975 Carbon steel Inorganic materials 0.000 description 7
- 239000010962 carbon steel Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241000277275 Oncorhynchus mykiss Species 0.000 description 1
- 241000221535 Pucciniales Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
- F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
- F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Coating With Molten Metal (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、被締結物に対してねじ
下孔を穿設しながらねじ込むようにしたドリルねじを、
オーステナイト系のステンレス鋼にて製造する方法に関
するものである。[Industrial Application Field] The present invention provides a drill screw that is screwed into an object while drilling a pilot hole therein.
The present invention relates to a method for manufacturing austenitic stainless steel.
【０００２】0002
【従来の技術】一般に、この種のドリルねじには、シャ
ンク部の先端におけるドリル部を、例えば、特公昭４７
−２５６２号公報や特開昭５３−２５７５８号公報等に
記載されているように、冷間鍛造によって形成したもの
と、例えば、特公昭５８−３７０８６号公報や特公昭５
７−３６０８３号公報等に記載されているように、ミー
リングやグラインダー等の機械的な切削加工によって形
成したものとがあり、そのいずれのものにおいても、ド
リルねじの全体を炭素鋼製にして、頭部付きシャンクの
先端部にドリル部を、前記冷間鍛造又は切削加工によっ
て形成したのち、全体に浸炭処理又は窒化硬化処理等の
表面硬化処理を施すことによって、前記ドリル部におけ
る各切り刃における硬度を高くして、所定の切削性能を
付与するように構成している。しかし、ドリルねじは、
ねじ込んだ状態において、その頭部が被締結物の表面か
ら突出するものであるから、このドリルねじの全体を炭
素鋼製にした場合には、当該ドリルねじにおける頭部が
、長時間にわたって大気又は風雨等に晒されて錆びると
言うように耐腐食性が低いのである。[Prior Art] In general, this type of drill screw has a drill part at the tip of the shank part, for example,
For example, those formed by cold forging as described in Japanese Patent Publication No. 58-37086 and Japanese Patent Publication No. 58-37086, as described in Japanese Patent Publication No. 53-25758,
As described in Publication No. 7-36083, etc., there are drill screws formed by mechanical cutting using milling, grinding, etc. In all of these, the entire drill screw is made of carbon steel, After forming a drill part at the tip of the head-equipped shank by the cold forging or cutting process, the entire surface is subjected to surface hardening treatment such as carburizing treatment or nitriding hardening treatment, so that each cutting edge in the drill part is hardened. The hardness is increased to provide a predetermined cutting performance. However, the drill screw
When the drill screw is screwed in, the head protrudes from the surface of the object to be fastened, so if the entire drill screw is made of carbon steel, the head of the drill screw will be exposed to the atmosphere or the atmosphere for a long time. It has low corrosion resistance, as it rusts when exposed to wind and rain.
【０００３】このドリルねじの頭部における耐腐食性を
向上するには、前記ドリルねじの全体を、例えば、特開
昭５５−１７７９６号公報等に記載されているように、
１８％Ｃｒ−８％Ｎｉのオーステナイト系のステンレス
鋼製にすれば良いことが考えられるが、ドリルねじの全
体をステンレス鋼製にする場合、このステンレス鋼製ド
リルねじにおけるドリル部には、普通の浸炭処理では、
充分な厚さの硬化層を形成することができず、ドリル部
に対して、充分な厚さの硬化層を形成することによって
、所定の切削性能を付与するためには、ステンレス鋼ド
リルねじの全体に対して、イオン浸炭処理（ドリルねじ
を真空炉内に入れて加熱し、炭化水素系ガスを含む減圧
雰囲気中でドリルねじを陰極とし、陽極との間に直流電
圧を印加してグロー放電を発生させることによって、イ
オン化した炭素をドリルねじに衝突して浸炭を行う処理
）を施すか、或いは、シアン化処理を施すか、若しは、
イオン窒化処理（ドリルねじを真空炉内に入れて加熱し
、窒素系ガスを含む減圧雰囲気中でドリルねじを陰極と
し、陽極との間に直流電圧を印加してグロー放電を発生
させることによって、イオン化した窒素をドリルねじに
衝突して窒化を行う処理）等の窒化硬化処理を施すよう
にしなければならず、このイオン浸炭処理又はシアン化
処理或いは窒化硬化処理に際しては、ドリルねじにおけ
る頭部の表面にまでもイオン浸炭処理又はシアン化処理
或いは窒化硬化処理による硬化層が形成され、この硬化
層を有する頭部に錆が発生することになるから、ステン
レス鋼製にする意義が半減するのである。[0003] In order to improve the corrosion resistance of the head of this drill screw, the entire drill screw is treated with
It may be possible to use austenitic stainless steel of 18% Cr-8% Ni, but if the entire drill screw is made of stainless steel, the drill part of this stainless steel drill screw may be made of ordinary In the carburizing process,
In order to provide the required cutting performance by forming a sufficiently thick hardened layer on the drill part, it is difficult to form a hardened layer with sufficient thickness. The entire body is subjected to ion carburizing treatment (the drill screw is placed in a vacuum furnace and heated, the drill screw is used as a cathode in a reduced pressure atmosphere containing hydrocarbon gas, and a DC voltage is applied between it and the anode to produce a glow discharge. (carburizing process by colliding ionized carbon with the drill screw), cyanidation treatment, or
Ion nitriding treatment (by placing a drill screw in a vacuum furnace and heating it, using the drill screw as a cathode in a reduced pressure atmosphere containing nitrogen gas, and applying a DC voltage between it and the anode to generate a glow discharge, It is necessary to perform a nitriding hardening treatment such as a process in which ionized nitrogen collides with the drill screw to nitride it. During this ion carburizing treatment, cyanidation treatment, or nitriding hardening treatment, the head of the drill screw must be hardened. A hardened layer is formed even on the surface due to ion carburizing, cyanidation, or nitriding, and rust will form on the head with this hardened layer, so the significance of making it made of stainless steel is halved. .
【０００４】そこで、最近では、ドリルねじにおけるシ
ャンク部及び頭部を前記オーステナイト系のステンレス
鋼製にする一方、ドリル部を、炭素鋼製にし、この炭素
鋼製のドリル部を、前記ステンレス鋼製の頭部付きシャ
ンク部に対して、溶接にて一体的に結合したのち、全体
に対して浸炭処理等の表面硬化処理を施すことにより、
ドリル部に所定の切削性能を確保した状態で、頭部に錆
が発生しないようにした所謂複合材料製のドリルねじが
一部において実施されている。Therefore, recently, the shank and head of a drill screw are made of the austenitic stainless steel, while the drill part is made of carbon steel, and the carbon steel drill part is replaced with the stainless steel. After welding the shank part with the head into one piece, we apply surface hardening treatment such as carburization to the entire body.
Some drill screws are made of a so-called composite material, which prevents rust from forming on the head while ensuring a predetermined cutting performance in the drill part.
【０００５】[0005]
【発明が解決しようとする課題】しかし、このステンレ
ス鋼と炭素鋼との複合材料製のドリルねじの製造に際し
ては、ステンレス鋼製の頭部付きシャンクの先端に対し
て、炭素鋼製の素材片を溶接し、次いで、前記の溶接部
を、グラインダーにて研磨し、且つ、焼鈍を行ったのち
、ドリル部を、冷間鍛造又は切削加工によって形成する
ようにしなければならず、前記の溶接とその後における
研磨とに、多大の手数と複雑な工程とを必要とするから
、製造コストが大幅にアップするのであり、しかも、ド
リル部を炭素鋼製にして、これを、ステンレス鋼製の頭
部付きシャンク部に対して溶接するために、ドリルねじ
の強度が、当該ドリルねじの全体を一体化した場合より
も大幅に低下すると言う問題があった。しかも、前記表
面硬化処理に際して、ステンレス鋼製の頭部にも、薄い
硬化層が必然的に形成されることにより、この頭部に若
干の錆が発生すると言う問題もあった。本発明は、これ
らの問題を解消したオーステナイト系ステンレス鋼製ド
リルねじの製造方法を提供することを目的とするもので
ある。[Problems to be Solved by the Invention] However, when manufacturing a drill screw made of a composite material of stainless steel and carbon steel, a piece of carbon steel material is attached to the tip of a shank with a head made of stainless steel. Then, the welded part must be ground with a grinder and annealed, and then the drilled part must be formed by cold forging or cutting. The subsequent polishing requires a lot of effort and complicated processes, which significantly increases manufacturing costs.Moreover, the drill part is made of carbon steel, and the drill head is made of stainless steel. Since the drill screw is welded to the attached shank portion, there is a problem in that the strength of the drill screw is significantly lower than when the entire drill screw is integrated. Furthermore, during the surface hardening treatment, a thin hardened layer is inevitably formed on the stainless steel head, which causes a problem in that some rust occurs on the head. An object of the present invention is to provide a method for manufacturing an austenitic stainless steel drill screw that eliminates these problems.
【０００６】[0006]
【課題を解決するための手段】この目的を達成するため
本発明は、オーステナイト系のステンレス鋼にて、シャ
ンク部と頭部とを一体的に形成し、前記シャンク部及び
頭部の表面に、銅メッキを施すか又は錫メッキを施し、
次いで、前記シャンク部の先端に、冷間鍛造加工又は切
削加工にてドリル部を形成し、シャンク部の外周面にね
じ山を造形したのち、イオン浸炭処理又はシアン化処理
或いは窒化硬化処理等の表面硬化処理を施すことにした
。[Means for Solving the Problems] In order to achieve this object, the present invention includes a shank portion and a head portion integrally formed of austenitic stainless steel, and a surface of the shank portion and head portion having a Copper plated or tin plated,
Next, a drill part is formed at the tip of the shank part by cold forging or cutting, and a thread is formed on the outer peripheral surface of the shank part, and then ion carburizing treatment, cyanidation treatment, nitridation hardening treatment, etc. I decided to perform surface hardening treatment.
【０００７】[0007]
【発明の作用・効果】このように、ステンレス鋼製のシ
ャンク部及び頭部の表面に対して、銅メッキを施すか又
は錫メッキを施したのち、前記シャンク部の先端に、ド
リル部を、冷間鍛造にて形成すると、前記シャンク部の
表面における銅メッキ層又は錫メッキ層のうち前記ドリ
ル部の個所における銅メッキ層又は錫メッキ層は、前記
ドリル部を冷間鍛造するときにおいて、極めて薄くなる
ように引き延ばされることにより、ドリル部において最
も重要な各切り刃の部分は、銅メッキ層又は錫メッキ層
が部分的に剥げてステンレス鋼の地肌が露出する状態に
なるから、イオン浸炭処理又はシアン化処理或いは窒化
硬化処理等の表面硬化処理に際しては、前記ドリル部に
おける各切り刃の部分に対して、前記表面硬化処理によ
る硬化層を確実に形成することができる一方、前記頭部
の表面に、前記表面硬化処理による硬化層が形成される
ことを、当該表面に予め施した銅メッキ層又は錫メッキ
層によって、確実に阻止することができ、換言すると、
頭部の表面に表面硬化処理による硬化層を形成すること
なく、ドリル部における各切り刃の部分に対して、表面
硬化処理による十分な厚さの硬化層を確実に形成するこ
とができるのである。As described above, after copper plating or tin plating is applied to the surfaces of the stainless steel shank part and head, a drill part is attached to the tip of the shank part. When formed by cold forging, of the copper plating layer or tin plating layer on the surface of the shank part, the copper plating layer or tin plating layer at the location of the drill part is extremely difficult to form when the drill part is cold forged. By being stretched to become thinner, the copper plating layer or tin plating layer of each cutting edge, which is the most important part of the drill part, will partially peel off and the stainless steel surface will be exposed, so ion carburization is required. When performing surface hardening treatment such as cyanidation treatment or nitridation hardening treatment, it is possible to reliably form a hardened layer by the surface hardening treatment on each cutting edge portion of the drill portion, while at the same time The formation of a hardened layer by the surface hardening treatment on the surface of the material can be reliably prevented by the copper plating layer or the tin plating layer applied to the surface in advance.In other words,
Without forming a hardened layer due to surface hardening on the surface of the head, it is possible to reliably form a sufficiently thick hardened layer through surface hardening on each cutting edge portion of the drill part. .
【０００８】また、ステンレス鋼製のシャンク部及び頭
部の表面に対して、銅メッキ施すか又は錫メッキを施し
たのち、前記シャンク部の先端に、ドリル部を、切削加
工にて形成すると、前記シャンク部の表面における銅メ
ッキ層又は錫メッキ層のうち前記ドリル部に個所におけ
る銅メッキ層又は錫メッキ層は、前記ドリル部を切削加
工するときにおいて削り取られることにより、ドリル部
において最も重要な切り刃の部分は、銅メッキ層又は錫
メッキ層が完全に除かれてステンレス鋼の地肌が露出す
る状態になるから、イオン浸炭処理又はシアン化処理或
いは窒化硬化処理等の表面硬化処理に際しては、前記ド
リル部における各切り刃の部分に対して、前記表面硬化
処理による硬化層を確実に形成することができる一方、
前記頭部の表面に、前記表面硬化処理による硬化層が形
成されることを、当該表面に予め施した銅メッキ層又は
錫メッキ層によって、確実に阻止することができ、換言
すると、この場合においても、頭部の表面表面硬化処理
による硬化層を形成することなく、ドリル部における各
切り刃の部分に対して、表面硬化処理による十分な厚さ
の硬化層を確実に形成することができるのである。[0008] Furthermore, if the surfaces of the stainless steel shank part and head are plated with copper or tin, and a drill part is formed at the tip of the shank part by cutting, Of the copper plating layer or tin plating layer on the surface of the shank part, the copper plating layer or tin plating layer on the drill part is scraped off when cutting the drill part. Since the copper plating layer or tin plating layer is completely removed from the cutting edge part and the stainless steel surface is exposed, when surface hardening treatment such as ion carburizing treatment, cyanidation treatment, or nitridation hardening treatment is performed, While being able to reliably form a hardened layer by the surface hardening treatment on each cutting edge portion of the drill part,
Formation of a hardened layer by the surface hardening treatment on the surface of the head can be reliably prevented by a copper plating layer or a tin plating layer applied to the surface in advance; in other words, in this case. Also, it is possible to reliably form a sufficiently thick hardened layer by surface hardening on each cutting edge part of the drill part without forming a hardened layer by surface hardening on the head. be.
【０００９】なお、前記頭部及びシャンク部の表面に施
した銅メッキ層又は錫メッキ層は、前記表面硬化処理の
あとにおいて、酸洗い等によって除去するようにしても
良いが、除去しなくても良い。また、前記銅メッキは、
先づ、シャンク部及び頭部の表面に対して、極く薄いニ
ッケルメッキを施し、この極く薄いニッケルメッキ層を
下地にして、その表面に対して施される。更にまた、前
記窒化硬化処理には、前記したイオン窒化処理及びガス
窒化処理を含むことは勿論のこと、ガス窒化とガス浸炭
とを組み合わせたものをも含むのである。[0009] Note that the copper plating layer or tin plating layer applied to the surfaces of the head and shank portions may be removed by pickling or the like after the surface hardening treatment, but they do not have to be removed. Also good. Moreover, the copper plating is
First, an extremely thin nickel plating layer is applied to the surfaces of the shank and the head, and the surfaces are then applied using this extremely thin nickel plating layer as a base. Furthermore, the nitriding hardening treatment includes not only the ion nitriding treatment and gas nitriding treatment described above, but also a combination of gas nitriding and gas carburizing.
【００１０】従って、本発明によると、オーステナイト
系ステンレス製のドリルねじを、その頭部に錆が発生す
ることがなく耐腐食性が高くて、ドリル部に高い切削性
能をもたせた状態で、製造することができるのであり、
この製造に際して、前記従来のように溶接すること、及
び溶接後における研磨することを必要としないから、製
造コストを大幅に低減できて、安価に提供できる効果を
有する。Therefore, according to the present invention, a drill screw made of austenitic stainless steel can be manufactured in such a state that no rust occurs on its head, it has high corrosion resistance, and the drill part has high cutting performance. It is possible to
This manufacturing process does not require welding or polishing after welding as in the conventional method, so manufacturing costs can be significantly reduced and the product can be provided at low cost.
【００１１】[0011]
【実施例】以下、本発明の実施例を説明する。第１図に
おいて符号１は、１８％Ｃｒ−８％Ｎｉのオーステナイ
ト系ステンレス鋼にてシャンク部２と頭部３とを一体的
に造形したねじ素材を示し、該ねじ素材１におけるシャ
ンク部２及び頭部３の表面に、極く薄い（０．５〜３ミ
クロン程度）ニッケルの下地メッキを施したのち、銅メ
ッキを施すことにより、第２図に示すように、厚さ３〜
１５ミクロン程度の銅メッキ層４を形成する。[Examples] Examples of the present invention will be described below. In FIG. 1, reference numeral 1 indicates a screw material in which a shank portion 2 and a head portion 3 are integrally formed from 18% Cr-8% Ni austenitic stainless steel. After applying an extremely thin (approximately 0.5 to 3 micron) nickel base plating to the surface of the head 3, copper plating is applied to the surface, resulting in a thickness of 3 to 3 microns, as shown in Figure 2.
A copper plating layer 4 of about 15 microns is formed.
【００１２】次いで、前記ねじ素材１におけるシャンク
２の先端を、第３図に示すように構成した左右一対の鍛
造成形用の金型５，６にて、左右両側から挟み付けるこ
とにより、第４図に示すように、ドリル部７を、冷間鍛
造にて形成したのち、前記シャンク部２の外周面に、ね
じ山８を転造にて形成することにより、第５図に示すよ
うなドリルねじ９とするのである。Next, the tip of the shank 2 of the screw material 1 is sandwiched from both left and right sides by a pair of left and right forging molds 5 and 6 configured as shown in FIG. As shown in the figure, after forming the drill part 7 by cold forging, a thread 8 is formed on the outer peripheral surface of the shank part 2 by rolling, thereby producing a drill as shown in FIG. This is the screw 9.
【００１３】そして、これらの加工工程が終わると、前
記ドリルねじ９を、真空炉内に入れて、前記したイオン
窒化処理を行うのである。このイオン窒化処理に先立っ
て、予め銅メッキを施したシャンク部２の先端を、冷間
鍛造することでドリル部７に形成したことにより、シャ
ンク部２の表面における銅メッキ層４のうち前記ドリル
部７の個所における銅メッキ層は、当該ドリル部７を冷
間鍛造するときにおいて、極めて薄くなるように引き延
ばされ、ドリル部７において最も重要な各切り刃の部分
は、銅メッキ層が部分的に剥げてステンレス鋼の地肌が
露出する状態になるから、前記のイオン窒化処理に際し
ては、前記ドリル部７における各切り刃の部分に対して
、前記イオン窒化処理による硬化層を確実に形成するこ
とができる一方、前記頭部３の表面に、前記イオン窒化
処理による硬化層が形成されることを、当該頭部３の表
面に予め施した銅メッキ層４によって、確実に阻止でき
るのであり、換言すると、頭部３の表面に、前記イオン
窒化処理による硬化層を形成することなく、ドリル部７
における各切り刃の部分に対して、前記イオン窒化処理
による十分な厚さの硬化層を確実に形成することができ
るのである。After these machining steps are completed, the drill screw 9 is placed in a vacuum furnace and subjected to the ion nitriding treatment described above. Prior to this ion nitriding treatment, the tip of the shank portion 2, which had been copper-plated in advance, was formed into the drill portion 7 by cold forging, so that the tip of the shank portion 2, which had been previously copper-plated, was formed into the drill portion 7. The copper plating layer at the portion 7 is stretched to become extremely thin when the drill portion 7 is cold-forged, and the copper plating layer is applied to the most important cutting edge portions of the drill portion 7. Since the stainless steel will partially peel off and the bare surface of the stainless steel will be exposed, during the ion nitriding treatment, a hardened layer by the ion nitriding treatment must be reliably formed on each cutting edge portion of the drill portion 7. On the other hand, the formation of a hardened layer due to the ion nitriding treatment on the surface of the head 3 can be reliably prevented by the copper plating layer 4 applied in advance to the surface of the head 3. In other words, the drill portion 7 is formed without forming a hardened layer on the surface of the head 3 due to the ion nitriding treatment.
It is possible to reliably form a sufficiently thick hardened layer by the ion nitriding treatment on each cutting edge portion.
【００１４】なお、前記イオン窒化処理に際して、銅メ
ッキ層４の表面が、焼けて変色するので、全体の表面に
、前記イオン窒化処理の後において、金属光沢色を有す
る塗料を塗布して製品として仕上げるか、又は、前記銅
メッキ層４及びその下地としてのニッケルメッキ層を酸
洗い又は電解剥離等によって除去して製品として仕上げ
るか、或いは、前記銅メッキ層４及びその下地としての
ニッケルメッキ層を酸洗い又は電解剥離等によって除去
したのち、全体の表面に金属光沢色を有する塗料を塗布
することによって、製品として仕上げるのである。また
、前記銅メッキ層４及びその下地としてのニッケルメッ
キ層を酸洗い又は電解剥離等によって除去したのち、全
体の表面に、亜鉛の電気メッキを施すか、ニッケル亜鉛
合金の電気メッキを施すことによって、製品として仕上
げるようにしても良いのである。Note that during the ion nitriding process, the surface of the copper plating layer 4 is burnt and discolored, so after the ion nitriding process, a paint with a metallic luster color is applied to the entire surface to produce a product. Alternatively, the copper plating layer 4 and the nickel plating layer as the base thereof are removed by pickling or electrolytic peeling to finish the product, or the copper plating layer 4 and the nickel plating layer as the base thereof are removed. After removing it by pickling or electrolytic stripping, the entire surface is coated with a paint having a metallic luster color to finish the product. Further, after removing the copper plating layer 4 and the nickel plating layer as its base by pickling or electrolytic peeling, the entire surface is electroplated with zinc or with a nickel-zinc alloy. , it is also possible to finish it as a product.
【００１５】次に、前記イオン窒化処理する以前におい
て銅メッキを施すことが、ドリル部７における切削性能
に及ぼす影響について次のような実験を行なった。すな
わち、銅メッキを施すことなくドリル部７を冷間鍛造し
たのちイオン窒化処理した直径５ｍｍのオーステナイト
系ステンレス鋼製のドリルねじと、厚さ８ミクロンの銅
メッキを施してドリル部７を冷間鍛造したのちイオン窒
化処理した直径５ｍｍの本発明によるオーステナイト系
ステンレス鋼製のドリルねじとの両方を、毎分１０００
回転にして、厚さ１．６ ｍｍの鋼板に対してねじ込む
場合において、そのねじ込み開始からねじ込み終了まで
の時間を測定したところ、前者のドリルねじの場合は、
１０本の平均値で１．５１４ 秒であったのに対し、後
者の本発明のドリルねじの場合には、同じく１０本の平
均値で１．５１９ 秒であり、銅メッキ層４の有無が切
削性能に対して及ぼす影響は殆ど認められなかった。ま
た、イオン浸炭処理するに際しても同様の試験を行った
ところ、その結果は、前記イオン窒化処理の場合と同じ
ように、銅メッキ層４の有無が切削性能に対して及ぼす
影響は殆ど認められなかったのである。Next, the following experiment was conducted to examine the effect that applying copper plating before the ion nitriding treatment has on the cutting performance of the drill portion 7. That is, the drill part 7 is cold-forged without copper plating, and then the drill screw is made of austenitic stainless steel with a diameter of 5 mm, which is ion nitrided, and the drill part 7 is cold-forged with copper plating of 8 microns thick. A drill screw made of austenitic stainless steel according to the invention with a diameter of 5 mm, which has been forged and ion-nitrided, is heated at a speed of 1000 per minute.
When rotating and screwing into a steel plate with a thickness of 1.6 mm, we measured the time from the start of screwing to the end of screwing, and in the case of the former drill screw,
The average value for 10 screws was 1.514 seconds, whereas in the case of the latter drill screw of the present invention, the average value for 10 screws was 1.519 seconds, and the presence or absence of the copper plating layer 4 was Almost no effect on cutting performance was observed. In addition, a similar test was conducted when performing ion carburizing treatment, and the results showed that, as in the case of ion nitriding treatment, the presence or absence of the copper plating layer 4 had almost no effect on cutting performance. It was.
【００１６】なお、前記実施例は、ドリル部７を、冷間
鍛造にて形成する場合であったが、本発明はこれに限ら
ず、ドリル部７を、切削加工にて形成する場合について
も同様に適用できることは言うまでもない。また、前記
銅メッキに代えて、錫メッキを適用しても良いが、これ
ら銅メッキ又は錫メッキを採用することの意味は、これ
ら銅又は錫は軟らかいことにより、ドリル部を鍛造形成
するときの成形用金型の寿命を低下することがないから
であり、これら銅メッキ又は錫メッキに代えてニッケル
メッキを適用した場合には、前記ドリル部に対する鍛造
成形用金型の寿命を大幅に低下するのであった。[0016] In the above embodiment, the drill portion 7 is formed by cold forging, but the present invention is not limited to this, and may also be applied to a case where the drill portion 7 is formed by cutting. Needless to say, it can be applied in the same way. In addition, tin plating may be applied instead of the copper plating, but the meaning of using copper plating or tin plating is that copper or tin is soft, so it is difficult to forge the drill part. This is because the life of the forming die will not be reduced, and if nickel plating is applied instead of these copper plating or tin plating, the life of the forging die for the drill part will be significantly reduced. It was.
【図１】本発明によるドリルねじの素材を示す正面図で
ある。FIG. 1 is a front view showing a material for a drill screw according to the present invention.
【図２】図１の素材に銅メッキを施した状態の正面図で
ある。FIG. 2 is a front view of the material shown in FIG. 1 coated with copper plating.
【図３】ドリル部の鍛造成形用金型の斜視図である。FIG. 3 is a perspective view of a forging die for the drill portion.
【図４】ドリル部を冷間鍛造したときの正面図である。FIG. 4 is a front view of the drill portion when it is cold forged.
【図５】ドリルねじの正面図である。FIG. 5 is a front view of the drill screw.
１ ドリルねじの素材 ２ シャンク部 ３ 頭部 ４ 銅メッキ層 ５，６ 成形用金型 ７ ドリル部 ８ ねじ山 ９ ドリルねじ 1. Drill screw material 2 Shank part 3 Head 4 Copper plating layer 5, 6 Molding mold 7 Drill part 8 Screw thread 9 Drill screw
Claims (1)
ャンク部と頭部とを一体的に形成し、前記シャンク部及
び頭部の表面に、銅メッキを施すか又は錫メッキを施し
、次いで、前記シャンク部の先端に、冷間鍛造加工又は
切削加工にてドリル部を形成し、シャンク部の外周面に
ねじ山を造形したのち、イオン浸炭処理又はシアン化処
理或いは窒化硬化処理等の表面硬化処理を施すことを特
徴とするステンレス鋼製ドリルねじの製造方法。[Claim 1] A shank part and a head part are integrally formed of austenitic stainless steel, the surfaces of the shank part and the head part are plated with copper or tin, and then the surfaces of the shank part and the head part are plated with copper or tin, and then the A drill part is formed at the tip of the shank part by cold forging or cutting, and a thread is formed on the outer peripheral surface of the shank part, followed by surface hardening treatment such as ion carburizing treatment, cyanidation treatment, or nitridation hardening treatment. A method for manufacturing a stainless steel drill screw, characterized by subjecting it to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3061298A JP3050620B2 (en) | 1990-10-17 | 1991-03-01 | Manufacturing method of stainless steel drill screw |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2-279985 | 1990-10-17 | ||
| JP27998590 | 1990-10-17 | ||
| JP3061298A JP3050620B2 (en) | 1990-10-17 | 1991-03-01 | Manufacturing method of stainless steel drill screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04219512A true JPH04219512A (en) | 1992-08-10 |
| JP3050620B2 JP3050620B2 (en) | 2000-06-12 |
Family
ID=26402339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3061298A Expired - Fee Related JP3050620B2 (en) | 1990-10-17 | 1991-03-01 | Manufacturing method of stainless steel drill screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3050620B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2080572A1 (en) * | 2008-02-12 | 2009-07-22 | Yu-Sheng Tseng | Method for cold forging high strength fastener from austenitic 300 series material |
| JP2014506287A (en) * | 2010-12-20 | 2014-03-13 | エヨット ゲーエムベーハー ウント カンパニー カーゲー | Low alloy carbon steel screw and method of manufacturing the screw |
-
1991
- 1991-03-01 JP JP3061298A patent/JP3050620B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2080572A1 (en) * | 2008-02-12 | 2009-07-22 | Yu-Sheng Tseng | Method for cold forging high strength fastener from austenitic 300 series material |
| JP2014506287A (en) * | 2010-12-20 | 2014-03-13 | エヨット ゲーエムベーハー ウント カンパニー カーゲー | Low alloy carbon steel screw and method of manufacturing the screw |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3050620B2 (en) | 2000-06-12 |
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