JPH02199313A - Drill screw - Google Patents
Drill screwInfo
- Publication number
- JPH02199313A JPH02199313A JP28699189A JP28699189A JPH02199313A JP H02199313 A JPH02199313 A JP H02199313A JP 28699189 A JP28699189 A JP 28699189A JP 28699189 A JP28699189 A JP 28699189A JP H02199313 A JPH02199313 A JP H02199313A
- Authority
- JP
- Japan
- Prior art keywords
- drill
- zinc
- screw
- shank
- alloy layer
- 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
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 claims description 15
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 13
- 229910052725 zinc Inorganic materials 0.000 claims description 13
- 239000011701 zinc Substances 0.000 claims description 13
- 238000007747 plating Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 238000005553 drilling Methods 0.000 abstract description 9
- 238000005242 forging Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 229910001021 Ferroalloy Inorganic materials 0.000 abstract 2
- 238000005520 cutting process Methods 0.000 description 22
- 239000002184 metal Substances 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 20
- 238000003825 pressing Methods 0.000 description 8
- 210000003128 head Anatomy 0.000 description 4
- 210000001747 pupil Anatomy 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste 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
- F16B25/0084—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by geometric details of the screw characterised by geometric details of the tip
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Electroplating Methods And Accessories (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は頭付きねじの先端部に被締結物に対し〔従来の
技術〕
一般にこの種のドリルねしには、例えば特公昭４１−２
０００９号公報（米国特許第３１２５９２３号明細書）
、米国特許第３９３３０７５号明細書又は特開昭５６−
８６２１７号公報（英国、特許公開第２０６３７３１号
公報）等に記載されているようにドリル部をフライス等
の切削加工によって形成したものと、例えば特公昭４７
−２５６２号公報（米国特許第３４６３０４５号明細書
）、特公昭４Ｂ−１３１３９号公報（米国特許第３３９
５６０３号明細書）又は特開昭４６−１４０１号公報（
米国特許第３６８３４３６号明細書）等の記載されてい
るようにドリル部を鍛造加工によって形成したものとが
ある。[Detailed Description of the Invention] [Industrial Field of Application] The present invention applies to objects to be fastened at the tip of a headed screw.
Publication No. 0009 (U.S. Patent No. 3,125,923)
, U.S. Patent No. 3,933,075 or JP-A-56-
86217 (UK, Patent Publication No. 2063731) etc., the drill part is formed by cutting with a milling cutter, etc., and
-2562 (U.S. Patent No. 3,463,045), Japanese Patent Publication No. 4B-13139 (U.S. Pat. No. 339)
5603 specification) or JP-A-46-1401 (
As described in U.S. Pat. No. 3,683,436, etc., there is one in which the drill portion is formed by forging.
これら各種ドリルねしにおけるドリル部は、いずれも当
該ドリル部に少なくとも２つの縦溝を形成する一方、ド
リル部の先端には、前記両縁溝間におけるランド部分に
ドリル部の自由終端から前記シャンクに向って斜め外向
きに延びる一対の傾斜状進入端面を形成し、該再進入端
面をドリル部の自由終端において交差させることによっ
て当該交差箇所にチゼルエツジを形成し、且つ、前記両
縦溝を構成する一つの満面を前記各進入端面と交差させ
ることによって当該交差箇所に各々先端切刃を形成した
ものであることは周知の通りである。The drill parts of these various drill bits all have at least two vertical grooves formed in the drill part, and at the tip of the drill part, the free end of the drill part is connected to the land part between the grooves on both edges. forming a pair of inclined entry end faces extending diagonally outward toward the re-entering end faces, and intersecting the re-entry end faces at the free terminal end of the drill part to form a chisel edge at the intersection point; and forming both longitudinal grooves. It is well known that by intersecting one full surface with each of the entry end surfaces, tip cutting edges are formed at the intersections.
そして、これら周知のドリルねしにおけるドリル性能は
、ドリルねじを所定の回転速度で回転させつつ金属板に
対して所定の力で押圧した場合に、そのドリル部が金属
板を貫通するまでに要する秒単位の時間によって表わす
のが一般的である。The drilling performance of these well-known drill bits is defined as the time required for the drill part to penetrate the metal plate when the drill screw is rotated at a predetermined rotational speed and pressed against the metal plate with a predetermined force. It is generally expressed in terms of time in seconds.
（発明が解決しようとする課題〕
しかし、前記例示した先行の各特許文献等に記載されて
いる従来のドリルねしは、いずれも専らそのドリル部の
形状に工夫を施すことによって、前記ドリル性能の向上
を図ったものであるが、ドリル部の形状によるドリル性
能の向上には、被締結物に対するドリル部による穿孔に
際して、ドリル部における先端切刃に欠損が発生したり
、ドリル部を鍛造成形した場合には、その鍛造成形金型
の寿命が極端に低下したり、或いはドリル部を切削によ
って形成する場合には、その切削加工に要するコストが
著しく向上したりする等の点において限界があった。(Problems to be Solved by the Invention) However, all of the conventional drill bits described in the preceding patent documents listed above have improved the drill performance by devising the shape of the drill part. However, in order to improve the performance of the drill by changing the shape of the drill part, it is difficult to improve the performance of the drill by forging the drill part or by forging the drill part. If this happens, the life of the forging mold will be extremely reduced, or if the drill part is formed by cutting, the cost required for the cutting process will increase significantly. Ta.
従って、従来のドリルねしは、そのドリル部が金属板を
貫通ずるのに要する時間を短くするには、金属板に対す
る押圧力を大きくしなればならないから、金属板が薄い
金属板の場合には、当該薄い金属板をドリルねじの押圧
力によって凹み変形することになり、また、厚い金属板
の場合には、ドリルねじのねじ込み作業を行う作業者の
疲労が増大することになる。Therefore, with conventional drill bits, in order to shorten the time required for the drill part to penetrate the metal plate, the pressing force against the metal plate must be increased. In this case, the thin metal plate will be deformed by the pressing force of the drill screw, and in the case of a thick metal plate, the fatigue of the worker who performs the work of screwing in the drill screw will increase.
本発明の目的は、ドリルねしにおけるドリル性能を、ド
リル部の形状によることなく向上することにある。An object of the present invention is to improve the drilling performance of a drill bit regardless of the shape of the drill part.
本発明者はドリルねしにおいて、そのドリル性能を如何
にして向上するかについて研究した結果、ドリルねしに
おけるドリル性能は、当該ドリルねじのドリル部を切削
によって形成した場合であっても、ドリル部を鍛造によ
って形成した場合であっても、そのドリル部における表
面の性質による影響が大であると言う点に着目して本発
明を完成するに至った。As a result of research on how to improve the drilling performance of a drill thread, the present inventor found that the drilling performance of a drill thread does not improve even when the drill part of the drill thread is formed by cutting. The present invention was completed by focusing on the fact that even when the drilled part is formed by forging, the surface properties of the drilled part have a large influence.
すなわち本発明は、前記のようにドリル部を切削又は鍛
造によって形成して成るドリルねじにおいて、該ドリル
ねじのうち少なくとも前記ドリル部の表面に、亜鉛−鉄
系の合金層を形成したことを特徴とするドリルねしであ
る。That is, the present invention is characterized in that, in the drill screw in which the drill portion is formed by cutting or forging as described above, a zinc-iron alloy layer is formed on at least the surface of the drill portion of the drill screw. This is a drill.
このようしにてドリル部の表面に亜鉛−鉄系の合金層を
形成したことにより、ドリル部によって金属板を穿孔す
る場合におけるドリル性能は、以下の各実施例において
述べるように、ドリル部に対して防食のために亜鉛又は
錫を単に電気鍍金しただけのものよりも飛曜的に向上す
る。By forming a zinc-iron alloy layer on the surface of the drill part in this way, the drill performance when drilling a metal plate with the drill part is improved, as described in the following examples. On the other hand, the corrosion resistance is significantly improved compared to those simply electroplated with zinc or tin.
しかして、ドリル部の表面に形成した亜鉛−鉄系の合金
層が、ドリル性能の向上にどのようにして寄与するかに
ついては明らかではない。However, it is not clear how the zinc-iron alloy layer formed on the surface of the drill part contributes to improving drill performance.
しかし、以下に述べる各実施例においてドリル部による
金属板の穿孔に際しての切削屑が、ドリル部の表面に対
して防食のために亜鉛又は錫を単に電気鍍金しただけの
ものでは５．比較的細かい裂断形又はせん新形切屑であ
ったのに対して、本発明のようにドリル部の表面に亜鉛
−鉄系の合金層を形成したものでは、コイル状に比較的
長（連続する流れ形切屑であったこと、及びドリル部の
先端切刃による金属板、の切削面が、ドリル部の表面に
亜鉛又は錫を単に電気鍍金しただけのものによりもきわ
めて平滑であったこと等から判断すると、ドリル部の表
面における亜鉛−鉄系の合金層の存在によって、ドリル
部の表面と金属板及び切削屑との滑りが著しく良好にな
り、ドリル部におけるランドと金属板との摩擦、進入端
面と金属板との摩擦、溝面と切削屑との摩擦が各々低減
して、この状態で、前記切削屑の排出が円滑に行なわれ
つつドリル部の先端切刃による切削がきわめてスムース
に行なえるようになったものと考えられる。However, in each of the embodiments described below, the cutting waste generated when drilling a metal plate with a drill part is 5.5% if the surface of the drill part is simply electroplated with zinc or tin for corrosion protection. In contrast to relatively fine fractured or sheared chips, in the case of the present invention in which a zinc-iron alloy layer is formed on the surface of the drill part, chips are relatively long (continuous) in the form of a coil. The cutting surface of the metal plate by the tip cutting edge of the drill part was much smoother than that of the surface of the drill part that was simply electroplated with zinc or tin. Judging from this, the presence of the zinc-iron alloy layer on the surface of the drill part significantly improves the sliding between the surface of the drill part and the metal plate and cutting chips, and the friction between the land and the metal plate in the drill part. The friction between the entry end surface and the metal plate and the friction between the groove surface and the cutting debris are reduced, and in this state, the cutting debris is smoothly discharged and cutting by the cutting edge at the tip of the drill part is extremely smooth. It is thought that it is now possible to do so.
〔実施例１〕
第１図〜第４図に示す鉄鋼型のドリルねじ１０は、頭部
１２から一体的に延びるねじ山１３付きシャンク１１と
一体のドリル部１４を、例えば、前記特公昭４８−１３
１３９号公報（米国特許第３３９５６０３号明細書）に
開示されているように２つのダイスによる挟み成形によ
って鍛造成形したものである。但し、この図において符
号１５は、前記ドリル部１４に設けた左右一対の縦溝を
、符号１６は、該両瞳溝１５の間における２つのランド
部分１７に、ドリル部１４の自由終端から前記シャンク
１１に向かって斜め外向きに延びるように設けた一対の
傾斜状進入端面を、符号１８は、前記再進入端面１６を
ドリル部１４の自由終端で交差させることによって形成
したチゼルエツジを、符号２０は、前記両瞳溝１５を構
成する一つの溝面１９と前記進入端面１８との交差箇所
に各々形成した先端切刃を各々示す。[Embodiment 1] The steel type drill screw 10 shown in FIGS. 1 to 4 has a drill part 14 integrated with a shank 11 with a thread 13 extending integrally from a head 12, for example, -13
As disclosed in No. 139 (U.S. Pat. No. 3,395,603), it is forged by sandwich forming using two dies. However, in this figure, reference numeral 15 indicates a pair of left and right vertical grooves provided in the drill portion 14, and reference numeral 16 indicates a pair of vertical grooves provided on the drill portion 14, and a reference numeral 16 indicates a pair of vertical grooves provided on the drill portion 14 from the free end of the drill portion 14 to the two land portions 17 between the two pupil grooves 15. A pair of inclined entry end faces 18 are provided to extend diagonally outward toward the shank 11, and reference numeral 20 represents a chisel edge formed by intersecting the reentry end faces 16 at the free end of the drill portion 14. 1 and 2 respectively show tip cutting edges formed at the intersections of one groove surface 19 constituting the both pupil grooves 15 and the entry end surface 18.
この鍛造成形による形式のドリルねじ１０を、そのねじ
市外径（Ｄ＞が４ ＋ｕのサイズのものを多数本用意し
、このうち半分については、そのドリル部１４に単に亜
鉛の電気鍍金を施しただけにしく従来品）、残りの半分
については、そのドリル部１４に亜鉛の電気鍍金を施し
たのち、４００℃の温度で６０分間加熱することによっ
て、ドリル部１４の表面に亜鉛−鉄系の合金層を形成し
た（本発明品）。A large number of drill screws 10 of this forged type are prepared with a diameter (D>4 + u), and for half of them, the drill portion 14 is simply electroplated with zinc. As for the remaining half (conventional product), the drill part 14 is electroplated with zinc and then heated at 400°C for 60 minutes to coat the surface of the drill part 14 with zinc-iron. (product of the present invention).
そして、これら従来品と本発明品とを、毎分当たりの回
転数を２５００回にした回転速度で、厚さ１・６鶴の鉄
板に対して１３・６ ｋｇの押圧力にてねじ込む場合と
、厚さ３・２ｍｌの鉄板に対して１８・１ ｋｇの押圧
力にてねじ込む場合との２つの場合について、そのドリ
ル部１４が鉄板を貫通する時間（ドリル時間）を測定し
て、その各々の１０本当たりの平均値を求めた結果は、
次に示す第１表の通りであった。The conventional product and the product of the present invention are screwed into a 1.6-thick iron plate with a pressing force of 13.6 kg at a rotation speed of 2500 revolutions per minute. The time required for the drill part 14 to penetrate the steel plate (drill time) was measured in two cases: when screwing into a steel plate with a thickness of 3.2 ml with a pressing force of 18.1 kg, and in each case. The result of calculating the average value per 10 pieces is
The results were as shown in Table 1 below.
第 １ 表
すなわち、ドリル部の表面に亜鉛−鉄系の合金層を形成
したドリルねしく本発明品）は、そのドリル部が金属板
を貫通するに要する時間を、ドリル部の表面に単に亜鉛
を電気鍍金しただけの従来のドリルねじの場合に比べて
約半分に短縮できるのであった。Table 1 In other words, the drill part (the product of the present invention) in which a zinc-iron alloy layer is formed on the surface of the drill part is designed to reduce the time required for the drill part to penetrate the metal plate by simply adding zinc to the surface of the drill part. Compared to conventional drill screws that are simply electroplated, the time required for drilling can be reduced by about half.
〔実施例２〕
第°５図〜第７図に示す鉄鋼層のドリルねじ１０ａは、
頭部１２ａから一体的に延びるねじ山１３ａ付きシャン
クｌｌａと一体のドリル部１４ａを、前記特公昭４１−
２０００９号公報（米国特許第３１２５９２３号明細書
）に開示されている通りの形状に切削加工にて形成した
ものである。但し、この図において符号１５ａは、ドリ
ル部１４ａに設けた左右一対の縦溝を、符号１６ａは、
該両瞳溝１６ａ間における２つのランド部分１７ａに、
ドリル部１４ａの自由終端から前記シャンク１１ａに向
かって斜め外向きに延びるように設けた一対の傾斜状進
入端面を、符号１８は、前記再進入端面１６ａをドリル
部自由終端で交差させることによって形成したチゼルエ
ツジを、符号２０ａは、前記両瞳溝１５ａを構成する一
つの溝面１９ａと前記進入端面１６ａとの交差箇所に各
々形成した先端切刃を各々示す。[Example 2] The steel layer drill screw 10a shown in Figs. 5 to 7 is as follows:
A drill portion 14a integrated with a shank lla with a threaded thread 13a extending integrally from the head 12a is provided by the above-mentioned Japanese Patent Publication No. 41-
It is formed by cutting into a shape as disclosed in No. 20009 (US Pat. No. 3,125,923). However, in this figure, the reference numeral 15a indicates a pair of left and right vertical grooves provided in the drill portion 14a, and the reference numeral 16a indicates a pair of vertical grooves provided on the drill portion 14a.
In the two land portions 17a between both pupil grooves 16a,
A pair of inclined entry end faces 18 are provided to extend obliquely outward toward the shank 11a from the free end of the drill part 14a, and are formed by intersecting the re-entry end faces 16a at the free end of the drill part. The reference numeral 20a indicates a tip cutting edge formed at the intersection of one groove surface 19a constituting the both pupil grooves 15a and the entrance end surface 16a.
この切削加工による形式のドリルねじ１０ａを、そのね
じ市外径（Ｄ）が４鰭のサイズのものを多数本用意し、
このうち半分については、そのドリル部１４ａに単に亜
鉛の電気鍍金を施しただけにし〈従来品）、残りの半分
については、そのドリル部１４ａに亜鉛の電気鍍金を施
したのち、４００℃の温度で６０分間加熱することによ
って、ドリル部１４ａの表面に亜鉛−鉄系の合金層を形
成した（本発明品）。Prepare a large number of drill screws 10a of this cutting type with a diameter (D) of 4 fins,
For half of these, the drill portion 14a was simply electroplated with zinc (conventional product), and for the remaining half, the drill portion 14a was electroplated with zinc and then heated at a temperature of 400°C. By heating for 60 minutes, a zinc-iron alloy layer was formed on the surface of the drill part 14a (product of the present invention).
そして、これら従来品と本発明品を、前記実施例１と同
様に毎分当たりの回転数を２５００回にした回転速度で
、厚さ１・６鶴の鉄板に対して１３・６ ｋｇの押圧力
にてねじ込む場合と、厚さ３・２關の鉄板に対して１．
８・１ ｋｇの押圧力にてねじ込む場合との２つの場合
について、そのドリル部１４ａが鉄板を貫通する時間（
ドリル時間）を測定して、その各々の１０本当たりの平
均値を求めた結果は、次に示す第２表の通りであった。The conventional product and the product of the present invention were pressed against a 1.6-thick iron plate by a force of 13.6 kg at a rotational speed of 2500 revolutions per minute as in Example 1. When screwing with pressure, 1.
The time it takes for the drill part 14a to penetrate the steel plate in two cases: the case where the screw is screwed in with a pressing force of 8.1 kg (
The drill time) was measured and the average value for each 10 drills was calculated, and the results are shown in Table 2 below.
第 ２ 表
また、ステンレス鋼にて前記第５図〜第７図に示す形状
にした切削加工によるドリルねしについても同様の試験
を行った結果は、次の第３表の通りで、ステンレス鋼製
のドリルねじの場合についても可成りの効果を得ること
ができた。Table 2 In addition, similar tests were conducted on stainless steel drill bits cut into the shapes shown in Figures 5 to 7, and the results are shown in Table 3 below. Considerable effects were also obtained in the case of drill screws manufactured by the company.
第 ３ 表
すなわち、ドリル部の表面に亜鉛−鉄系の合金層を形成
したドリルねじ（本発明品）は、そのドリル部が金属板
を貫通するに要する時間を、ドリル部の表面に単に亜鉛
を電気鍍金しただけの従来のドリルねじの場合に比べて
約３〜４割も短縮できるのであった。Table 3 shows that the drill screw with a zinc-iron alloy layer formed on the surface of the drill part (the product of the present invention) is designed to reduce the time required for the drill part to penetrate the metal plate by simply adding zinc to the surface of the drill part. Compared to conventional drill screws that are simply electroplated, the time can be reduced by about 30 to 40%.
（以下、余白）
〔実施例３〕
第８図〜第１３図に示す鉄鋼型のドリルねじ１０ｂは、
頭部１２ｂから一体的に延びるね、じ山１３ｂ付きシャ
ンクｌｌｂと一体のドリル部１４ｂを、前記特開昭５６
−８６２１７号公報（英国、特許公開第２０６３７３１
号公報）に開示されている形状通りに切削加工にて形成
したものである。(Hereinafter, blank space) [Example 3] The steel type drill screw 10b shown in FIGS. 8 to 13 is
A drill portion 14b integrated with a shank 1lb with a thread 13b extending integrally from the head 12b is provided in accordance with the above-mentioned Japanese Patent Laid-Open No. 56
-86217 Publication (UK, Patent Publication No. 2063731
It is formed by cutting according to the shape disclosed in Japanese Patent Publication No.
但し、この図において符号１５ｂは、ドリル部１４ｂに
設けた左右一対の縦溝を、符号１６ｂは、該両縁溝１５
ｂ間における２つのランド部分１７ｂに、ドリル部１４
ｂの自由終端から前記シャンクｌｌｂに向かって斜め外
向きに延びるように設けた一対の傾斜状進入端面を、符
号１８ｂは、前記両進入端面１６ｂをドリル部１４ｂの
自由終端で交差させることによって形成したチゼルエツ
ジを、符号２０ｂは、前記両組溝１５ｂを構成する一つ
の溝面１９ｂと前記進入端面１６ｂとの交差箇所に各々
形成した先端切刃を各々示す。However, in this figure, reference numeral 15b indicates a pair of left and right longitudinal grooves provided in the drill portion 14b, and reference numeral 16b indicates a pair of left and right longitudinal grooves provided on the drill portion 14b.
The drill portion 14 is attached to the two land portions 17b between b.
A pair of inclined entry end faces 18b are provided to extend obliquely outward toward the shank llb from the free end of b, and the reference numeral 18b is formed by intersecting both the entry end faces 16b at the free end of the drill portion 14b. The reference numeral 20b indicates a tip cutting edge formed at the intersection of one groove surface 19b constituting the double groove set 15b and the entry end surface 16b.
この形式の切削加工によるドリルねじ１０ｂを、そのね
じ市外径（Ｄ）が４鰭のサイズのものを多数本用意し、
このうち半分については、そのドリル部１４ｂに単に亜
鉛の電気鍍金を施しただけにしく従来品）、残りの半分
については、そのドリル部１４ｂに亜鉛の電気鍍金を施
したのち、４００℃の温度で６０分間加熱することによ
って、ドリル部１４ｂの表面に亜鉛−鉄系の合金層を形
成した（本発明品）。A large number of drill screws 10b made by this type of cutting are prepared, and the outer diameter (D) of the screw diameter is 4 fins.
For half of these, the drill portion 14b was simply electroplated with zinc (conventional product), and for the remaining half, the drill portion 14b was electroplated with zinc and then heated at a temperature of 400°C. By heating for 60 minutes, a zinc-iron alloy layer was formed on the surface of the drill part 14b (product of the present invention).
そして、これら従来品と本発明品とを、同様に毎分当た
りの回転数を２５００回にした回転速度で、厚さ１・６
龍の鉄板に対して７ ｋｇ及び１３・６ ｋｇの押圧力
にてねじ込む場合と、厚さ３・２龍の鉄板に対して１８
・１ ｋ＋ｒの押圧力にてねじ込む場合との３つの場合
について、そのドリル部１４ｂが鉄板を貫通する時間（
ドリル時間）を測定して、その各々の１０本当たりの平
均値を求めた結果は、次に示す第４表の通りであった。Then, these conventional products and the present invention product were rotated at a rotation speed of 2500 revolutions per minute to a thickness of 1.6 mm.
When screwing into a dragon iron plate with a pressing force of 7 kg and 13.6 kg, and when screwing into a 3.2 dragon iron plate with a pressure of 18 kg.
・The time it takes for the drill part 14b to penetrate the steel plate in the three cases of screwing in with a pressing force of 1k+r (
The drill time) was measured and the average value for each 10 drills was calculated, and the results are shown in Table 4 below.
第 ４ 表
すなわち、ドリル部の表面に亜鉛−鉄系の合金層を形成
したドリルねしく本発明品）は、そのドリル部が金属板
を貫通するに要する時間を、ドリル部の表面に単に亜鉛
を電気鍍金しただけの従来のドリルねじの場合に比べて
約４割〜６割も短縮できるのであった。Table 4 In other words, the drill part (the product of the present invention) in which a zinc-iron alloy layer is formed on the surface of the drill part is designed to reduce the time required for the drill part to penetrate the metal plate by simply adding zinc to the surface of the drill part. Compared to conventional drill screws that are simply electroplated, the time can be reduced by about 40% to 60%.
以上の通り本発明によると、ドリルねじにおけるドリル
部の表面に亜鉛−鉄系の合金層を形成したことによって
、ドリル部が金属板を穿孔しながら貫通するのに要する
時間を短縮できて、ドリル性能を向上できるから、薄い
金属板に対するドリルねじのねじ込みに際して、当該薄
い金属板に対するドリルねじの押圧によって金属板を凹
み変形することを確実に回避でき、また、厚い金属板に
対するドリルねじのねじ込みに際しては、軽い押圧力に
よって短時間でねじ込みできて、作業者の疲労を可成り
軽減できると共に、ねじ込み作業の能率を飛曜的に向上
できる効果を有する。As described above, according to the present invention, by forming a zinc-iron alloy layer on the surface of the drill part of a drill screw, the time required for the drill part to penetrate a metal plate while drilling can be shortened, and the drill Because performance can be improved, when screwing a drill screw into a thin metal plate, it is possible to reliably avoid deformation of the metal plate due to the pressure of the drill screw against the thin metal plate, and when screwing a drill screw into a thick metal plate, can be screwed in in a short time with a light pressing force, and has the effect of considerably reducing operator fatigue and dramatically improving the efficiency of screwing work.
第１図〜第４図は第１の実施例に使用したドリルねじを
示し、第１図はドリルねじの拡大正面図、第２図は第１
図の底面図、第３図は第２図の■−■視側面側面図４図
は第３図のＩＶ−ＩＶ視側面図、第５図〜第７図は第２
の実施例に使用したドリルねじを示し、第５図はドリル
ねじの拡大正面図、第６図は第５図の底面図、第７図は
第５図の右側面図、第８図〜第１３図は第３の実施例に
使用したドリルねじを示し、第８図は正面図、第９図は
第８図の底面図、第１Ｏ図は第９図の拡大図、第１１図
は第１０図ノＸ Ｉ −Ｘ Ｉ視測面図、第１２図は第
１０図のｘｎ−ｘｎ視側面図、第１３図は第１０図のｘ
ｍ−ｘｍ視側面図である。
１０．１０ａ、１０ｂ・・・−ドリルねし、１１゜１１
ａ、 １ ｌ ｂ・・・・シャンク、１２，１２ａ
、１２ ｂ ・−−−頭部、１３．１３ａ、 １３ｂ
・・・−ねじ山、１４．１４ａ、１４ｂ”ドリル部、１
５．１５ａ、１５ｂ−−−−縦溝、１６，１６ａ、１６
ｂ−・−・進入端面、１８． １８ ａ、 １８ ｂ
・・・・チゼルエツジ、１９．１９ａ、１９ｂ・・・・
溝面、２０．２０ａ、 ２Ｑｂ・・・・先端切刃。Figures 1 to 4 show the drill screw used in the first embodiment, Figure 1 is an enlarged front view of the drill screw, and Figure 2 is the drill screw used in the first embodiment.
Figure 3 is a side view taken from ■-■ of Figure 2. Figure 4 is a side view taken from IV-IV of Figure 3. Figures 5 to 7 are side views of Figure 2.
5 shows an enlarged front view of the drill screw, FIG. 6 shows a bottom view of FIG. 5, FIG. 7 shows a right side view of FIG. 5, and FIGS. Figure 13 shows the drill screw used in the third embodiment, Figure 8 is a front view, Figure 9 is a bottom view of Figure 8, Figure 1O is an enlarged view of Figure 9, and Figure 11 is an enlarged view of Figure 9. Figure 10 is an XI-XI visual plane view, Figure 12 is an xn-xn side view of Figure 10, and Figure 13 is an
It is a m-xm side view. 10.10a, 10b...-Drill, 11°11
a, 1 l b...Shank, 12, 12a
, 12 b --- Head, 13.13a, 13b
...-Thread, 14.14a, 14b" drill part, 1
5.15a, 15b---Vertical groove, 16, 16a, 16
b---Entry end surface, 18. 18 a, 18 b
...Chisel Edge, 19.19a, 19b...
Groove surface, 20.20a, 2Qb...Tip cutting edge.
Claims (2)
クの上端に一体的に形成した頭部と、前記シャンクの下
端部分に一体的に形成したドリル部とから成るドリルね
じおいて、該ドリルねじにおけるドリル部の表面に、亜
鉛−鉄系の合金層を形成したことを特徴とするドリルね
じ。(1) A drill screw consisting of a shank with a thread formed on its outer periphery, a head integrally formed at the upper end of the shank, and a drill part integrally formed at the lower end of the shank; A drill screw characterized in that a zinc-iron alloy layer is formed on the surface of a drill portion of the drill screw.
層が、ドリル部の表面に亜鉛を鍍金したのち加熱処理す
ることによって形成した亜鉛−鉄系の合金層であること
を特徴とする特許請求の範囲第１項に記載のドリルねじ
。(2) The zinc-iron alloy layer on the surface of the drill part is a zinc-iron alloy layer formed by plating the surface of the drill part with zinc and then heat-treating it. A drill screw according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28699189A JP2730597B2 (en) | 1989-11-02 | 1989-11-02 | Drill screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28699189A JP2730597B2 (en) | 1989-11-02 | 1989-11-02 | Drill screw |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23332888A Division JP2739141B2 (en) | 1988-09-16 | 1988-09-16 | Manufacturing method of drill screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02199313A true JPH02199313A (en) | 1990-08-07 |
| JP2730597B2 JP2730597B2 (en) | 1998-03-25 |
Family
ID=17711605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28699189A Expired - Fee Related JP2730597B2 (en) | 1989-11-02 | 1989-11-02 | Drill screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2730597B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5755542A (en) * | 1996-08-06 | 1998-05-26 | Elco Textron, Inc. | Self-drilling/self-tapping fastener |
-
1989
- 1989-11-02 JP JP28699189A patent/JP2730597B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5755542A (en) * | 1996-08-06 | 1998-05-26 | Elco Textron, Inc. | Self-drilling/self-tapping fastener |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2730597B2 (en) | 1998-03-25 |
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