JPH0625564B2 - Compound screw - Google Patents
Compound screwInfo
- Publication number
- JPH0625564B2 JPH0625564B2 JP7770590A JP7770590A JPH0625564B2 JP H0625564 B2 JPH0625564 B2 JP H0625564B2 JP 7770590 A JP7770590 A JP 7770590A JP 7770590 A JP7770590 A JP 7770590A JP H0625564 B2 JPH0625564 B2 JP H0625564B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- shank
- fastening
- tapping
- drill
- 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.)
- Expired - Lifetime
Links
- 150000001875 compounds Chemical class 0.000 title claims description 14
- 238000010079 rubber tapping Methods 0.000 claims description 40
- 239000002131 composite material Substances 0.000 claims description 17
- 239000007769 metal material Substances 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 8
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 6
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 6
- 239000010962 carbon steel Substances 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 description 12
- 238000010791 quenching Methods 0.000 description 10
- 238000003466 welding Methods 0.000 description 8
- 230000000171 quenching effect Effects 0.000 description 7
- 238000005255 carburizing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000010273 cold forging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 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
-
- 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
- F16B25/0036—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw
- F16B25/0094—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw the screw being assembled or manufactured from several components, e.g. a tip out of a first material welded to shaft of a second material
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Connection Of Plates (AREA)
- Forging (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、締結部分がステンレス鋼などの耐蝕性金属材
料によりつくられ、該締結部分の締結用ねじ部の先端に
ねじ立て可能な金属材料によりつくられたねじ立て部分
を結合した複合ねじ及び前記ねじ立て部分の先端にドリ
ル部を設けた複合ドリルねじの改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening portion made of a corrosion-resistant metal material such as stainless steel, and made of a metal material capable of being tapped at the tip of a fastening screw portion of the fastening portion. The present invention relates to the improvement of a compound screw in which the tapped portion is connected and a compound drill screw in which a drill portion is provided at the tip of the tapped portion.
従来の技術 従来、この種の複合ねじとしては、例えば米国特許第
３，９２４，５０８号、同第４，７３６，４８１号ある
いは西ドイツ特許公開第２，５４９，１４７号公報に記
載されているような複合ドリルねじが知られている。2. Description of the Related Art Conventionally, as a composite screw of this type, for example, U.S. Pat. Nos. 3,924,508 and 4,736,481 or West German Patent Publication No. 2,549,147 are disclosed. Composite drill screws are known.
また、本願発明者は上記同様の複合ドリルねじであっ
て、締結後にドリル部及びこれに連続する余分なねじ部
を折取り可能とした複合ドリルねじを、特願昭６３−２
９７３３４号により提案した。The inventor of the present invention has disclosed a composite drill screw similar to the above, which is capable of breaking off the drill portion and an extra screw portion continuous with the drill portion after fastening, in Japanese Patent Application No. 63-2.
Proposed by No. 97334.
上記従来の複合ドリルねじはいずれも、ステンレス鋼な
どの耐蝕性金属材料によりつくられた第１シャンクの一
端に頭部を一体に成形し、かつ外周面に締結用ねじ部を
設けた締結部分と、炭素鋼などの被締結部材にねじ立て
可能な金属材料、例えば焼入れ硬化可能な炭素鋼により
つくられ前記第１シャンクの他端に溶接にて接合された
第２シャンクの外周面にタッピンねじ部を設けたねじ立
て部分とを有し、更に該ねじ立て部分の先端にドリル部
を一体に成形したもので、前記ねじ立て部分及びドリル
部は焼入れ硬化されているが、前記締結部分は焼入れ硬
化されていない。In each of the conventional composite drill screws described above, a head portion is integrally formed with one end of a first shank made of a corrosion-resistant metal material such as stainless steel, and a fastening portion provided with a fastening screw portion on the outer peripheral surface. , A metal material that can be tapped on a member to be fastened such as carbon steel, for example, quench-hardenable carbon steel, and a tapping screw portion on the outer peripheral surface of the second shank joined by welding to the other end of the first shank. And a drill portion integrally formed at the tip of the tapping portion. The tapping portion and the drill portion are quench hardened, but the fastening portion is quench hardened. It has not been.
発明が解決しようとする課題 ところで、このような複合ねじを用いてねじ締結した場
合、ドリル部で下穴をあけ、タッピンねじ部によりねじ
立てされた雌ねじに対する締結用ねじ部の嵌め合せには
全く融通がないので、締結用ねじ部のねじ径がタッピン
ねじ部６のねじ径より僅かで大きい場合には、大きなね
じ込み抵抗を生じ、締結作業がスムーズに行なえなく
る。しかも、締結用ねじ部は焼入れ硬化されていないの
で、ねじ込み抵抗でねじ山が破損したり、シャンクが破
断することがあり、その結果、所定の保持力が得られな
いという問題点があった。特に、締結部分に耐蝕性のす
ぐれたオーステナイト系ステンレス鋼を採用した場合に
は、その特性である大きな摩擦抵抗のため上記した問題
点が著しくなる。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, when such a compound screw is used for screw fastening, a pilot hole is drilled, and there is no need to fit the fastening screw portion to the female screw tapped by the tapping screw portion. Since there is no interchangeability, when the screw diameter of the fastening screw portion is slightly larger than the screw diameter of the tapping screw portion 6, a large screwing resistance occurs and the fastening work cannot be performed smoothly. In addition, since the fastening screw portion is not hardened by hardening, the screw thread may be damaged due to screwing resistance or the shank may be broken, resulting in a problem that a predetermined holding force cannot be obtained. In particular, when austenitic stainless steel having excellent corrosion resistance is adopted for the fastening portion, the above-mentioned problems become remarkable due to the large frictional resistance which is its characteristic.
本発明は、上記従来の問題点に鑑みこれを解決すべくな
されたもので、ねじ込み抵抗が小さく、スムーズに締結
が行なえる複合ねじを提供することを目的としている。The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide a compound screw having a small screwing resistance and capable of being smoothly fastened.
課題を解決するための手段 上記目的を達成するために、本発明の複合ねじにおい
て、前記締結用ねじ部のねじ山の高さが、前記タッピン
ねじ部の最大外径のねじ山の高さより僅かに低く形成さ
れ、かつ前記両ねじ部の谷径がほぼ同一に形成されてい
ることを特徴とする。Means for Solving the Problems In order to achieve the above object, in the compound screw of the present invention, the height of the thread of the fastening screw portion is slightly smaller than the height of the thread of the maximum outer diameter of the tapping screw portion. It is characterized in that the root diameters of both threaded portions are formed to be substantially the same.
前記締結用ねじ部は、外径が前記タッピンねじ部の最大
外径箇所より前記頭部に向かって徐々に減少するテーパ
に形成することが好ましい。この場合、前記第１シャン
クと第２シャンクを同径とし、一方、ねじ転造ダイスの
合せ面を前記テーパに沿う傾斜面に研削し、ダイスセッ
ト時に前記傾斜面がねじ軸線と平行になるように裏側に
薄板を挟み込んだ転造ダイスを用いると、ねじ山の高さ
が前記頭部に向かって徐々に低くなる締結用ねじ部が容
易に加工できる。このとき、前記締結用ねじ部の谷径は
前記タッピンねじ部の谷径とほぼ同一となる。なお、前
記締結用ねじ部の谷径は、そのねじ山の高さとは逆に前
記頭部に向かって徐々に増大するテーパに形成してもよ
い。It is preferable that the fastening screw portion is formed in a taper whose outer diameter gradually decreases from the maximum outer diameter portion of the tapping screw portion toward the head. In this case, the first shank and the second shank have the same diameter, and on the other hand, the mating surface of the thread rolling die is ground into an inclined surface along the taper so that the inclined surface becomes parallel to the screw axis when the die is set. If a rolling die in which a thin plate is sandwiched is used on the back side, a fastening screw portion in which the height of the screw thread gradually decreases toward the head can be easily processed. At this time, the root diameter of the fastening screw portion is substantially the same as the root diameter of the tapping screw portion. The root diameter of the fastening screw portion may be formed in a taper that gradually increases toward the head, contrary to the height of the thread.
また、前記第２シャンクの先端部にねじ下穴をあけるド
リル部を設けて複合ドリルねじとする。Further, a drill portion for drilling a screw hole is provided at the tip of the second shank to form a composite drill screw.
前記第１シャンクにはオーステナイト系ステンレス鋼
が、そして前記第２シャンクには炭素鋼が好適である。Austenitic stainless steel is suitable for the first shank, and carbon steel is suitable for the second shank.
作用 上記のように構成された複合ねじは、そのタッピンねじ
部によりねじ立てされた雌ねじに対する締結用ねじ部の
嵌め合わせに若干の融通があるので、ねじ込み抵抗が小
さく、締結がスムーズに行なわれる。Action The composite screw configured as described above has a slight flexibility in fitting the fastening threaded portion to the female screw tapped by the tapping threaded portion, so that the screwing resistance is small and the fastening is smoothly performed.
実施例 以下、本発明の実施例を図面に基づいて説明する。第１
図は本発明による複合ドリルねじのブランクを構成する
第１シャンク１１を示し、第２図は同第２シャンク１２
を示している。Embodiment An embodiment of the present invention will be described below with reference to the drawings. First
The drawing shows a first shank 11 which constitutes a blank of a composite drill screw according to the present invention, and FIG. 2 shows a second shank 12 thereof.
Is shown.
第１シャンク１１は、浸炭焼入れが不可の金属材料であ
るオーステナイト系ステンレス鋼からなり、後述するね
じ山の転造加工に適合する所定の直径Ｄを有し、その一
端部に回動工具を係合する頭部１３はヘッダ加工され、
他端部は平坦面１４に形成されている。The first shank 11 is made of austenitic stainless steel, which is a metal material that cannot be carburized and quenched, has a predetermined diameter D that is suitable for the thread rolling process described below, and has a rotating tool at one end thereof. The matching head 13 is processed into a header,
The other end is formed on the flat surface 14.
第２シャンク１２は、浸炭焼入れ可能な金属材料、例え
ば低炭素鋼からなり、第１シャンク１１と同一の直径Ｄ
を有する短軸状に形成されると共に、一端部中央に溶接
突起１５が一体的に成形されている。該溶接突起１５は
後述する破断部１６となるもので、その最大直径Ａは通
常Ａ＝０．５Ｄ〜０．８Ｄの範囲で設定される。これ
は、一般にドリルねじにおけるドリル部及びこれに続く
ねじ部による下穴加工及びねじ立てに要するトルクが、
本体ねじ部の締結に要する締付けトルクの約1/3〜2/3で
比較的小さい点を考慮し、前記ドリル部による下穴加工
及びこれに続くタッピンねじ部によるねじ立てに対して
強度的に十分耐え得るものであり乍ら、前記本体ねじ部
に対しては比較的容易に破断し得るようにするためであ
る。The second shank 12 is made of a metal material capable of carburizing and quenching, for example, low carbon steel, and has the same diameter D as the first shank 11.
And a welding projection 15 is integrally formed at the center of one end. The welding projection 15 becomes a fractured portion 16 described later, and the maximum diameter A thereof is usually set in the range of A = 0.5D to 0.8D. This is because the torque required for drilling and tapping by the drill part and the subsequent thread part of the drill screw is generally
Considering the fact that it is about 1/3 to 2/3 of the tightening torque required to fasten the main body screw thread, which is relatively small, it has a strong strength against drilling with the drill section and subsequent tapping with the tapping thread section. This is because it can withstand sufficiently and can be relatively easily broken with respect to the main body screw portion.
第３図ないし第５図は、上記のよいうに構成した第１シ
ャンク１１と第２シャンク１２を用いて複合ドリルねじ
を製作する製造工程を示している。FIGS. 3 to 5 show a manufacturing process for manufacturing a composite drill screw by using the first shank 11 and the second shank 12 configured as described above.
まず、第３図に示すように、第１シャンク１１の平坦面
１４と第２シャンク１２の溶接突起１５を抵抗溶接によ
り接合し、その接合部分に破断部１６を有する複合材料
製のブランク２０を形成する。First, as shown in FIG. 3, the flat surface 14 of the first shank 11 and the welding projection 15 of the second shank 12 are joined by resistance welding, and a blank 20 made of a composite material having a fractured portion 16 at the joined portion is formed. Form.
次に、第４図に示すように、ブランク２０の第２シャン
ク１２にドリル部２１が冷間鍛造によって形成される。
この冷間鍛造によるドリル部２１の加工金型は公知技術
であるので図示は省略したが、ドリル部２１の成形時に
余肉がはみ出し、図示のようにドリル部２１の外側縁に
沿ってスクラップ２２が生じる。Next, as shown in FIG. 4, the drill portion 21 is formed in the second shank 12 of the blank 20 by cold forging.
Although a mold for working the drill portion 21 by the cold forging is a known technique, it is not shown in the drawing. However, when the drill portion 21 is molded, excess thickness is squeezed out, and scrap 22 is formed along the outer edge of the drill portion 21 as illustrated. Occurs.
続いて、第６図に示すねじ転造ダイス３０を用いて、第
１シャンク１１の外周面に締結用ねじ部２３を、そして
第２シャンク１２の外周面にタッピンねじ部２４を連続
して転造加工する。この転造加工と同時にスクラップ２
２を除去してドリル部２１が仕上げられ、第５図に示す
ように、締結部分（ねじ本体）２６とねじ立て部分２７
からなる複合ドリルねじ２５が得られる。Then, using the thread rolling die 30 shown in FIG. 6, the fastening screw portion 23 is continuously rolled on the outer peripheral surface of the first shank 11, and the tapping screw portion 24 is continuously rolled on the outer peripheral surface of the second shank 12. Build and process. Scrap 2 at the same time as this rolling process
2 is removed to finish the drill portion 21, and as shown in FIG. 5, a fastening portion (screw body) 26 and a tapping portion 27.
A composite drill screw 25 consisting of
締結用ねじ部２３のねじ山２３ａは、その高さがタッピ
ンねじ部２４の最大外径Ｄ１のねじ山２４ａの高さＨ１
より僅かに低く形成され、かつ、頭部１３に向かって徐
々に低くなり、最小外径Ｄ２のねじ山２３ｂの高さＨ２
で終わっており、全体として外径がタッピンねじ部２４
の最大外径Ｄ１のねじ山２４ａ箇所より頭部１３に向か
って徐々に減少するテーパに形成されている。The height of the screw thread 23a of the fastening screw portion 23 is the height H 1 of the screw thread 24a having the maximum outer diameter D 1 of the tapping screw portion 24.
The height H 2 of the screw thread 23b having the smallest outer diameter D 2 is formed to be slightly lower and gradually lower toward the head 13.
, The outer diameter is the tapping screw part 24 as a whole.
The taper taper gradually decreases from the screw thread 24a having the maximum outer diameter D 1 toward the head 13.
ところで、この種の複合ねじは主として建築用金属薄板
を取り付けるのに使用するため、そのねじ径はタッピン
ねじ部２４の最大外径箇所で３mm〜７mmの小径である。
したがって、前記テーパは、タッピンねじ部２４の最大
外径のねじ山２４ａの外径Ｄ１と締結用ねじ部２３の最
小外径のねじ山２３ｂの外径Ｄ２の差が9/100mm以下の
ごく僅かである。第５図には理解を容易にするために誇
張して図示したが、実際には目視でほとんど確認できな
い程度である。By the way, since this type of compound screw is mainly used for attaching a thin metal plate for construction, the screw diameter is 3 mm to 7 mm at the maximum outer diameter portion of the tapping screw portion 24.
Therefore, the taper has a difference of 9/100 mm or less between the outer diameter D 1 of the thread 24a having the largest outer diameter of the tapping screw portion 24 and the outer diameter D 2 of the thread 23b having the smallest outer diameter of the fastening screw portion 23. Very few. Although it is exaggerated in FIG. 5 for easy understanding, it is practically hardly visible.
また、締結用ねじ部２３の谷径ｄ２はタッピンねじ部２
４の谷径ｄ１とほぼ同一径に形成されている。なお、締
結用ねじ部２３の谷径ｄ２をねじ山２３ａの高さとは逆
に頭部１３に向かって徐々に増大するテーパに形成する
と、ねじ山２３ａの高さを容易に低くすることができ、
転造加工が容易になる。しかし、この場合でも、最大谷
径、すなわち最小外径のねじ山２３ｂの谷径はドリル部
２１の直径ｄより小さく設定する。Further, the root diameter d 2 of the fastening screw portion 23 is equal to the tapping screw portion 2
It is formed to have a diameter substantially equal to the root diameter d 1 of 4. If the root diameter d 2 of the fastening screw portion 23 is formed in a taper that gradually increases toward the head 13 as opposed to the height of the screw thread 23a, the height of the screw thread 23a can be easily lowered. You can
Rolling process becomes easy. However, even in this case, the maximum root diameter, that is, the root diameter of the thread 23b having the minimum outer diameter is set smaller than the diameter d of the drill portion 21.
一方、タッピンねじ部２４のねじ山２４ａは徐々に高さ
を減じて不完全ねじ部２４ｂとなり、ドリル部２１に近
接する位置まで延びている。そして、後述するねじ立て
のタッピンねじとして機能するため完全ねじ部のねじ山
２４ａが少なくとも一周以上連続するようにしてある。On the other hand, the thread 24a of the tapping screw portion 24 gradually decreases in height to become an incomplete screw portion 24b, which extends to a position close to the drill portion 21. And, since it functions as a tapping screw for tapping, which will be described later, the thread ridge 24a of the complete thread portion is made to continue at least once or more.
上述した締結用ねじ部２３とタッピンねじ部２４を転造
加工する前記ねじ転造ダイス３０は、特別に設計、製作
する必要はなく、第６図に示すように、標準のねじ転造
ダイスの合せ面３１を前述したテーパに適合する傾斜面
３２に研削加工した転造ダイスで十分である。The thread rolling die 30 for rolling the fastening screw portion 23 and the tapping screw portion 24 described above does not need to be specially designed and manufactured, and as shown in FIG. A rolling die in which the mating surface 31 is ground into the inclined surface 32 that matches the above-mentioned taper is sufficient.
そして、前記ねじ転造ダイス３０をセットする際、傾斜
面３２がねじ軸線とほぼ平行になるように裏側に金属薄
板３３を挟み込めば、前述したようにねじ山２３ａの高
さが頭部１３に向かって徐々に低くなる締結用ねじ部２
３がタッピンねじ部２４と同時に容易に転造加工でき
る。Then, when the thread rolling die 30 is set, if the metal thin plate 33 is sandwiched on the back side so that the inclined surface 32 becomes substantially parallel to the screw axis, the height of the screw thread 23a becomes the head 13 as described above. Fastening screw part 2 that gradually decreases toward
3 can be easily rolled simultaneously with the tapping screw portion 24.
このようにして製作された複合ドリルねじ２５は浸炭焼
入れ処理して完成される。この焼入れ処理によって、低
炭素鋼からなるタッピンねじ部２４とドリル部２１は共
に焼入れ硬化され、焼入れされていない炭素鋼のような
金属材料からなる被締結部材に下穴をあけ、かつ雌ねじ
を加工するのに必要な硬度が得られるけれども、オース
テナイト系ステンレス鋼からなる締結ねじ部２３及び頭
部１３は焼入れ硬化されない。また、第１シャンク１１
と第２シャンク１２との接合部分に形成された破断部１
６は、シャンクの内部に位置しているので焼入れ硬化さ
れない。The composite drill screw 25 thus manufactured is completed by carburizing and quenching. By this quenching treatment, the tapping screw portion 24 and the drill portion 21 made of low carbon steel are both quench hardened, and a prepared hole is made in a member to be fastened made of a metal material such as unquenched carbon steel and a female screw is processed. Although the hardness required to obtain this is obtained, the fastening screw portion 23 and the head portion 13 made of austenitic stainless steel are not hardened by quenching. Also, the first shank 11
1 formed at the joint between the second shank 12 and
Since No. 6 is located inside the shank, it is not hardened by quenching.
第７図ないし第１０図は、上記のように構成された複合
ドリル２５を用いて被締結部３５，３６を締結する順序
を示している。7 to 10 show the order of fastening the fastened portions 35 and 36 using the composite drill 25 configured as described above.
第７図では、ドリル部２１により切削加工した下穴３７
にタッピンねじ部２４でねじ立てしている状態を示して
おり、第８図ではねじ立てされた雌ねじ３８に締結用ね
じ部２３のねじ山２３ａが順次嵌合して行く状態を示し
ている。この嵌合状態ではねじ山２３ａと雌ねじ３８と
が直接接触するのを避ける程度の若干の融通がある。そ
して、第９図は頭部１３が被締結部材３５の表面に接近
し、首下部分の最小外径のねじ山２３ｂまで雌ねじ３８
に嵌合した状態を示している。この嵌合状態において
は、ねじ山２３ｂとこれに連続するねじ山２３と雌ねじ
３８との間にはかなりの嵌め合せ融通があるように見え
るけれども、実際にはごく僅かな融通であり、しかも、
第１０図に示す締結状態においては、軸力の発生でねじ
山２３ａ及び２３ｂの片側のフランク面３９が雌ねじ３
８に圧接するので、締結力の低下を引き起こすとはな
い。In FIG. 7, the prepared hole 37 cut by the drill portion 21
FIG. 8 shows a state in which the tapping screw portion 24 is tapped, and FIG. 8 shows a state in which the thread 23a of the fastening screw portion 23 is sequentially fitted into the tapped female screw 38. In this fitted state, there is some flexibility to avoid direct contact between the screw thread 23a and the female screw 38. Then, in FIG. 9, the head portion 13 approaches the surface of the member to be fastened 35, and the internal thread 38 up to the screw thread 23b of the minimum outer diameter of the lower neck portion.
It shows a state of being fitted to. In this fitted state, although there seems to be a considerable fitting interchange between the screw thread 23b and the screw thread 23 and the internal thread 38 which are continuous thereto, there is actually very little interchange, and
In the tightened state shown in FIG. 10, due to the generation of the axial force, the flank surface 39 on one side of the thread ridges 23a and 23b becomes the female screw 3
Since it is pressed against No. 8, it does not cause a decrease in fastening force.
而して、締結が終了した後、その裏側に突出するドリル
部２１及びタッピンネジ部２４は破断部１６から簡単に
折り取ることができる。一方、残存する第１シャンク１
１により成形された締結用ねじ部２３と頭部１３からな
る締結部分（ねじ本体）２６はオーステナイト系ステン
レス鋼により形成されているから、耐蝕性の点ですぐれ
たものとなる。Thus, after the fastening is completed, the drill portion 21 and the tapping screw portion 24 protruding to the back side thereof can be easily broken off from the breaking portion 16. On the other hand, the remaining first shank 1
Since the fastening portion (screw body) 26 including the fastening screw portion 23 and the head portion 13 formed by No. 1 is formed of austenitic stainless steel, it is excellent in corrosion resistance.
なお、上記実施例においては、第１シャンク１１と第２
シャンク１２を抵抗溶接により接合したが、圧接その他
の接合手段あるいは接着剤を用いて接合してもよい。ま
た、ドリル部２１及びタッピンねじ部２４の表面硬化手
段として浸炭焼入れを採用したが、ドリル部２１及びタ
ッピンねじ部２４を形成する第２シャンク１２の材質又
は該複合ドリルねじを使用する被締結物によっては、普
通の焼入れ処理でも所期の目的を達成することが可能で
ある。In the above embodiment, the first shank 11 and the second shank 11
Although the shank 12 is joined by resistance welding, it may be joined by pressure welding or other joining means or an adhesive. Further, although carburizing and quenching is adopted as the surface hardening means of the drill portion 21 and the tapping screw portion 24, the material of the second shank 12 forming the drill portion 21 and the tapping screw portion 24, or an object to be fastened using the composite drill screw Depending on the case, it is possible to achieve the intended purpose even with ordinary quenching treatment.
さらに、図示は省略したが、ドリル部２１に代えてタッ
ピンねじ部２４の先端に錐状の穴あけ手段を設けてもよ
く、あるいは穴あけ手段を設けずにタッピンねじ部２４
だけとすることも可能である。Further, although not shown in the drawing, a conical hole drilling means may be provided at the tip of the tapping screw portion 24 instead of the drill portion 21, or the tapping screw portion 24 may be provided without the drilling means.
It is also possible to do just that.
発明の効果 本発明の複合ねじは、上述のような構成を有しているの
で、前記タッピンねじ部によりねじ立てされた雌ねじに
対する締結用ねじ部の嵌め合わせに若干の融通があり、
耐蝕性金属材料からなる前記締結用ねじ部のねじ込み抵
抗が小さく、極めてスムーズに締結でき、所期の締結力
が得られる。Effect of the Invention Since the composite screw of the present invention has the above-mentioned configuration, there is some flexibility in fitting the fastening screw portion to the female screw tapped by the tapping screw portion,
The screwing resistance of the fastening screw portion made of a corrosion-resistant metal material is small, and the fastening can be performed extremely smoothly, and the desired fastening force can be obtained.
【図面の簡単な説明】 図面は本発明の実施例を示し、第１図は第１シャンクの
正面図、第２図は第２シャンクの正面図、第３図はブラ
ンクの正面図、第４図はドリル部の成形工程を示す正面
図、第５図は本発明に係る複合ドリルねじの正面図、第
６図はねじ転造ダイスの縦断面図、第７図ないし第１０
図は本発明の複合ドリルねじによる締結順序を示す説明
図である。 １１…第１シャンク、１２…第２シャンク １３…頭部、１４…平坦面 １５…溶接突起、１６…破断部 ２１…ドリル部、２３…締結ねじ部 ２３ａ，２３ｂ…ねじ山 ２４…タッピンねじ部、２４ａ…ねじ山 ２５…複合ドリルねじ、２６…締結部分 ２７…ねじ立て部分、３０…ねじ転造ダイス ３２…傾斜面BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, wherein FIG. 1 is a front view of a first shank, FIG. 2 is a front view of a second shank, FIG. 3 is a front view of a blank, and FIG. FIG. 5 is a front view showing a forming process of a drill portion, FIG. 5 is a front view of a composite drill screw according to the present invention, FIG. 6 is a vertical sectional view of a thread rolling die, and FIGS.
The figure is an explanatory view showing the order of fastening by the compound drill screw of the present invention. 11 ... 1st shank, 12 ... 2nd shank 13 ... Head part, 14 ... Flat surface 15 ... Welding projection, 16 ... Break part 21 ... Drill part, 23 ... Fastening screw part 23a, 23b ... Screw thread 24 ... Tapping screw part , 24a ... Screw ridge 25 ... Composite drill screw, 26 ... Fastening portion 27 ... Tapping portion, 30 ... Thread rolling die 32 ... Sloping surface
Claims (6)
る第１シャンクの一端に頭部を一体に成形し、かつ外周
面に締結用ねじ部を設けた締結部分と、前記第１シャン
クの他端に接合され、炭素鋼などの被締結部材にねじ立
て可能な金属材料からなる第２シャンクの外周面にタッ
ピンねじ部を設けたねじ立て部分とからなる複合ねじで
あって、 前記締結用ねじ部のねじ山の高さが、前記タッピンねじ
部の最大外径のねじ山の高さより僅かに低く形成され、
かつ前記両ねじ部の谷径がほぼ同一に形成されているこ
とを特徴とする複合ねじ。1. A fastening portion having a head integrally formed with one end of a first shank made of a corrosion-resistant metal material such as stainless steel, and a fastening screw portion provided on the outer peripheral surface, and a first shank other than the fastening portion. A fastening screw, which is joined to an end and has a tapping portion provided with a tapping screw portion on an outer peripheral surface of a second shank made of a metal material that can be tapped on a member to be fastened such as carbon steel, the fastening screw The height of the thread of the part is formed slightly lower than the height of the thread of the maximum outer diameter of the tapping screw part,
Moreover, a compound screw in which the root diameters of the both screw portions are formed to be substantially the same.
ねじ部の最大外径箇所より前記頭部に向かって徐々に減
少するテーパに形成されている請求項(1)記載の複合ね
じ。2. The compound screw according to claim 1, wherein an outer diameter of the fastening screw portion is formed so as to gradually decrease from a maximum outer diameter portion of the tapping screw portion toward the head portion. .
ねじ部の最大外径箇所より前記頭部に向かって徐々に減
少するテーパに形成される一方、前記締結用ねじ部の谷
径が、前記頭部に向かって徐々に増大するテーパに形成
されている請求項(2)記載の複合ねじ。3. The outer diameter of the fastening screw portion is tapered so as to gradually decrease from the maximum outer diameter portion of the tapping screw portion toward the head portion, while the root diameter of the fastening screw portion is formed. The compound screw according to claim (2), wherein the compound screw is formed in a taper that gradually increases toward the head.
けるドリル部が設けられ、そのドリル径が前記タッピン
ねじ部の最大谷径より大きく、かつ前記締結用ねじ部の
最小外径よりも小さいことを特徴とする請求項(1)ない
し(3)のいずれか１項に記載の複合ねじ。4. A drill portion for drilling a screw hole is provided at the tip of the second shank, the drill diameter being larger than the maximum root diameter of the tapping screw portion and smaller than the minimum outer diameter of the fastening screw portion. The compound screw according to any one of claims (1) to (3), characterized in that it is also small.
ンレス鋼であり、前記第２シャンクが炭素鋼である請求
項(1)ないし(4)のいずれか１項に記載の複合ねじ。5. The composite screw according to claim 1, wherein the first shank is austenitic stainless steel and the second shank is carbon steel.
が同径である請求項(1)ないし(5)のいずれか１項に記載
の複合ねじのブランク。6. The blank of the compound screw according to claim 1, wherein the first shank and the second shank have the same diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7770590A JPH0625564B2 (en) | 1990-03-27 | 1990-03-27 | Compound screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7770590A JPH0625564B2 (en) | 1990-03-27 | 1990-03-27 | Compound screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03277804A JPH03277804A (en) | 1991-12-09 |
| JPH0625564B2 true JPH0625564B2 (en) | 1994-04-06 |
Family
ID=13641316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7770590A Expired - Lifetime JPH0625564B2 (en) | 1990-03-27 | 1990-03-27 | Compound screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0625564B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4188010B2 (en) * | 2002-07-04 | 2008-11-26 | 有限会社新城製作所 | Heat resistant drill screw |
| JP4680976B2 (en) * | 2007-12-10 | 2011-05-11 | ユニバーサル製缶株式会社 | Bottle can body and bottle |
-
1990
- 1990-03-27 JP JP7770590A patent/JPH0625564B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03277804A (en) | 1991-12-09 |
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