JPH05138439A - Tapped thin tube and method and tool for tapping - Google Patents
Tapped thin tube and method and tool for tappingInfo
- Publication number
- JPH05138439A JPH05138439A JP32799891A JP32799891A JPH05138439A JP H05138439 A JPH05138439 A JP H05138439A JP 32799891 A JP32799891 A JP 32799891A JP 32799891 A JP32799891 A JP 32799891A JP H05138439 A JPH05138439 A JP H05138439A
- Authority
- JP
- Japan
- Prior art keywords
- burr
- tapping
- tap
- thin
- peripheral wall
- 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
Links
Landscapes
- Punching Or Piercing (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明はタップ加工した薄肉管
とそのタップ加工方法及び加工用工具に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin-walled pipe tapped, a tapping method therefor, and a machining tool.
【0002】[0002]
【従来の技術】従来例えば1、5〜2mm厚の金属板や
プレートに4〜6mm径のタップ加工を施す場合、ボル
ト径に対して上記板厚ではボルトやビスの締着力の維持
に必要なねじピッチのリードが確保されないために、タ
ップ加工前の下孔穿設を打ち抜き成形型によってプレス
加工し、下孔外周に板材の片側に円筒状に突出するよう
なスカート部を突出形成させて行い、該スカート部内周
にねじ切りすることによってナットのリードを確保し、
取付部荷重に耐えるボルト等の締着力を保持していた。
しかし角パイプ等の周壁にタップ加工するには、打ち抜
き用のポンチを受けるダイスをパイプ内に収容すること
ができないために、打ち抜き成形が不可能であり、パイ
プ表面にねじ山のリード不足を行う厚みのプレートを溶
着して下孔穿設後タップ加工を行うか、パイプ周壁にボ
ルト挿通孔を穿設してナットを溶着するかの方法が採ら
れていた。2. Description of the Related Art Conventionally, for example, when a metal plate or plate having a thickness of 1, 5 to 2 mm is tapped with a diameter of 4 to 6 mm, it is necessary to maintain the tightening force of bolts and screws with the above thickness relative to the bolt diameter. Since the lead of the screw pitch cannot be secured, the pre-drilling of the pre-tapping hole is performed by punching with a punching die to form a cylindrical skirt that projects on one side of the plate material around the pilot hole. , Secure the lead of the nut by threading on the inner circumference of the skirt,
The tightening force of bolts, etc., which bears the load of the mounting part was maintained.
However, when tapping on the peripheral wall of a square pipe, etc., the die that receives the punch for punching cannot be housed in the pipe, so punching is impossible, and the lead of the thread on the pipe surface is insufficient. A method of welding a thick plate and then tapping after drilling a lower hole, or drilling a bolt insertion hole in the peripheral wall of the pipe and welding a nut has been adopted.
【0003】[0003]
【発明が解決しようとする課題】しかしながら上記のよ
うな部品の溶着は溶接作業に多大な労力と加工コストを
要する上に、例えば食品機械や理化学機械等のように環
境内に落下や雑菌付着の可能性のあるフラックス等を残
さないために、溶接フラックスや酸化破片の除去や洗浄
作業が必要となるほか、装置のフレーム等の構造材では
溶接歪みの矯正等の処理も必要であるという欠点があっ
た。この発明はこれらの諸問題を解決するタップ加工し
た薄肉管とそのタップ加工のための加工方法及び加工用
工具を提供せんとするものである。However, the welding of parts as described above requires a great deal of labor and processing cost for the welding work, and also causes a drop in the environment such as a food machine or a physics and chemistry machine, and adhesion of various bacteria. There is a drawback that welding flux and oxidative debris must be removed and cleaning work must be performed in order to leave no possible flux, and that the structural materials such as the frame of the equipment must also be treated to correct welding distortion. there were. The present invention provides a tapped thin-walled pipe, a machining method and a machining tool for tapping which solve these problems.
【0004】[0004]
【課題を解決するための手段】上記問題点を解決するた
めの薄肉管は薄肉の周壁2内面側に円筒状又は円筒片状
のかえり4を突出形成し、該かえり4にタップ加工した
ことを特徴としている。同じくタップ加工方法は、薄肉
管1の周壁2に対し、内面側にねじピッチの不足を補う
肉厚方向の筒状又は筒片状のかえり4を形成するバーリ
ング加工により下孔3aを穿設し、該下孔3aにタップ
加工することを特徴としている。さらに加工用工具は、
尖端角αを鋭角とし刃先に切削機能を低減又は減殺させ
る加工6gを施し、少なくとも下端部外径にタップ下孔
の径を備えた錐部6bを形成したことを特徴としてい
る。In order to solve the above problems, a thin-walled pipe has a cylindrical or cylindrical piece-like burr 4 protrudingly formed on the inner surface of a thin peripheral wall 2 and tapped on the burr 4. It has a feature. Similarly, in the tapping method, the peripheral hole 2 of the thin-walled pipe 1 is provided with the pilot hole 3a by burring to form a burr 4 in the inner wall side in the thickness direction to compensate for the lack of the screw pitch. The tap hole is formed in the pilot hole 3a. Furthermore, the processing tools are
It is characterized in that the point angle α is made acute and the cutting edge is subjected to a processing 6g for reducing or diminishing the cutting function, and at least the outer diameter of the lower end portion is formed with the conical portion 6b having the diameter of the tapped hole.
【0005】[0005]
【作用】回転するタップ6(又はドリル8)等の刃先部
6b(8a)の先端を下孔3aのセンター位置に押接し
て押圧すると、加工部6g(8c)で摩擦されながらセ
ンター外周の周壁2がすり鉢状に塑性変形し、タップ6
等をさらに押し込むと、刃先部6b(8a)の先端が貫
通するとともに周壁2の内側に順次円筒状又は円筒片状
のかえり4が形成され、下孔3aが形成又は穿設され
る。なお、タップ6等の刃先部6bの尖端角α(θ)が
鋭角に形成されることによってバーリング加工時の押し
広げ抵抗を少なくし且つ周壁2の円筒状への押し広げを
容易にする。上記下孔3aに連続的に又は別工程でタッ
プ6,(9)を通すことによってタップ孔3の加工が終
了する。上記かえり4は、薄肉管1の周壁2の肉厚のみ
では足りないボルト類のリードを確保して予想される負
荷に耐える十分な締着力を保持する。When the tip of the cutting edge portion 6b (8a) of the rotating tap 6 (or drill 8) is pressed against the center position of the pilot hole 3a and pressed, the peripheral wall of the outer periphery of the center is rubbed by the processing portion 6g (8c). 2 plastically deforms into a mortar, tap 6
When the tip is further pushed in, the tip of the cutting edge portion 6b (8a) penetrates and a cylindrical or cylindrical piece-like burr 4 is sequentially formed inside the peripheral wall 2 to form or bore a pilot hole 3a. The sharp edge angle α (θ) of the cutting edge portion 6b of the tap 6 or the like reduces the spread resistance during the burring process and facilitates the spread of the peripheral wall 2 into the cylindrical shape. The processing of the tapped hole 3 is completed by passing the taps 6 and (9) through the pilot hole 3a continuously or in another step. The burr 4 secures a sufficient lead for bolts which is not sufficient only by the wall thickness of the peripheral wall 2 of the thin-walled tube 1 and holds sufficient fastening force to withstand an expected load.
【0006】[0006]
【実施例】図1は本発明のタップ加工済の薄肉管の断面
を示し、薄肉管1の周壁2の中央にはタップ孔3が穿設
されており、タップ孔3は周壁2の内面側に円筒状又は
円筒片状のかえり4を突出形成し、その内面にねじ切り
加工を施して加工されている。上記かえり4は周壁2の
板厚(例えば2mm)に対し、タップ径(例えば6m
m)のタップ加工を施す場合、ボルトの締着力を確保す
るためのねじ山が不足するのを補うためのものであり、
かえり4によりステンレススチール材(SOS304)
で少なくとも6mm以上のリードが確保されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a cross section of a thin-walled pipe of the present invention, which has been tapped. A tap hole 3 is formed in the center of a peripheral wall 2 of the thin-walled pipe 1, and the tap hole 3 is on the inner surface side of the peripheral wall 2. A burr 4 having a cylindrical shape or a cylindrical piece is formed in a protruding manner, and the inner surface thereof is processed by threading. The burr 4 has a tap diameter (for example, 6 m) with respect to the thickness of the peripheral wall 2 (for example, 2 mm).
When performing tapping of m), the purpose is to compensate for lack of threads for securing the tightening force of the bolt.
Stainless steel material (SOS304) by burr 4
Therefore, at least a lead of 6 mm or more is secured.
【0007】上記タップ孔3の下孔3aとかえり4はバ
ーリング加工によって形成されるもので、図1,図2に
示すタップ6はバーリングとタップ加工を同時に行うバ
ーリング用タップである。即ちこの例ではタップ6はテ
ーパー部分(チャンファー部分)6aの刃先部(錐部)
6bの尖端角αを例えば45゜位の円錐形をなすように
研削形成するとともに、タップ溝6cの下端に斜め方向
に形成した逃がし溝6dとねじ部6eの切り刃側との間
に形成されたエッジ(刃)部分6fには、右回転時(左
ねじでは左回転時)に切削機能をもたせないように減殺
し、あるいはこれを低下させるように研摩した加工部6
gが施され、さらに逃がし溝6dの反対側エッジ部分
(逃がし側)にも研摩加工により逃がし部6hが形成さ
れている。The lower hole 3a of the tap hole 3 and the burr 4 are formed by burring, and the tap 6 shown in FIGS. 1 and 2 is a burring tap for performing burring and tapping at the same time. That is, in this example, the tap 6 is a cutting edge portion (conical portion) of the tapered portion (chamfer portion) 6a.
The point angle α of 6b is formed by grinding so as to form a conical shape of, for example, about 45 °, and is formed between the relief groove 6d formed obliquely at the lower end of the tap groove 6c and the cutting blade side of the screw portion 6e. The edge (blade) portion 6f has a machining portion 6 which is abraded so as not to have a cutting function when rotated rightward (when rotated leftward with a left-hand screw), or polished so as to reduce it.
g, and a relief portion 6h is also formed by polishing on the edge portion (relief side) on the opposite side of the relief groove 6d.
【0008】上記のようなバーリング用タップ6でタッ
プ加工するには、先ず薄肉管1をボール盤上にセットし
てセンターポンチ等によりタップ孔3の位置決めを行
い、回転するタップ6の尖端をタップ孔3のセンター位
置に押接して切削油等を加えながら順次押圧下降させ
る。すると周壁2はタップ孔センター位置から外周方向
に押し広げられながらすり鉢状に塑性変形して陥没し、
次いで刃先尖端が周壁を貫通してそのまわりはタップ6
の下降とともに順次円筒状に押し広げられる。このとき
タップ6のチャンファー部分6aの下端はタップ下孔径
D1を形成しているので、チャンファー部分6a下端が
通過することによって下端径は確保され且つタップ外径
D2でのタップ切り作業がかえり4の内面面に至るまで
連続的に行われることになる。タップ切り終了後はタッ
プ6を上方に抜き取ってタップ加工を完了する。またか
えり4は円筒状になることが望ましいが、その形状は材
質がねばりのある軟質の場合は、円筒形に近くなり、硬
質の場合は円筒片状に突出形成される。To perform tapping with the burring tap 6 as described above, first, the thin-walled tube 1 is set on a drilling machine, the tap hole 3 is positioned by a center punch, and the tip of the rotating tap 6 is tapped. While pressing the center position of 3 and adding cutting oil and the like, the pressure is sequentially lowered. Then, the peripheral wall 2 is plastically deformed into a mortar shape while being pushed outward from the tap hole center position and is depressed,
Next, the tip of the cutting edge penetrates the peripheral wall and taps around it.
As it descends, it is gradually expanded into a cylindrical shape. At this time the lower end of the chamfer portion 6a of the tap 6 forms a tap pilot hole diameter D 1, the tap cutting work in the chamfer portion 6a bottom diameter by the lower end passes is ensured and the tap outer diameter D 2 However, it will be continuously performed until the inner surface of the burr 4. After the tap cutting is completed, the tap 6 is pulled out to complete the tap processing. The burr 4 is preferably cylindrical, but if the material is sticky and soft, the burr 4 is close to a cylinder, and if the burr 4 is hard, the burr 4 is formed into a cylindrical piece.
【0009】図3(A)はバーリング加工用ドリルを示
し、ドリル8は刃先部8aの尖端刃先角θを60゜前後
の鋭角にし、溝8dと刃先8eとの先端である刃先8b
の切削機能を低減又は減殺するように研摩加工(加工部
8c)が施されており、このドリル8はタップ9の下孔
径D1と同一径をなしている。上記ドリル8による下孔
加工は、前述の場合と同要領でドリル8を回転させなが
らタップ孔3のセンター位置に刃先部8aの尖端を押接
して押圧下降せしめる。ドリル8の刃先部8aは加工部
8cによって切削機能が減殺されているために切削孔は
形成されないで、薄肉管1の周壁2がすり鉢状に塑性変
形しながら穿孔され、ドリル8の下降とともにかえり4
が形成されてかえり4の下孔が穿設される。次いで図3
(B)に示すようなタップ9が通されてタップ加工を完
了する。FIG. 3 (A) shows a burring drill. The drill 8 has a sharp tip angle θ of the blade portion 8a of about 60 ° and a blade edge 8b which is the tip of the groove 8d and the blade edge 8e.
The polishing process (processed portion 8c) is performed so as to reduce or reduce the cutting function of the drill 8, and the drill 8 has the same diameter as the prepared hole diameter D 1 of the tap 9. The drilling with the drill 8 is performed by rotating the drill 8 in the same manner as described above, pressing the tip of the blade tip 8a to the center position of the tap hole 3 and pressing down. A cutting hole is not formed in the cutting edge portion 8a of the drill 8 because the cutting function is diminished by the processing portion 8c. Four
Is formed, and the pilot hole of the burr 4 is bored. Then Fig. 3
The tap 9 as shown in (B) is passed through to complete the tapping process.
【0010】上記例では薄肉管1のタップ加工を角形ス
テンレススチール管で示したが、本発明の応用範囲は角
形管に限らずその他の多角形円形断面のパイプの他、材
質はバーリング加工に適した塑性変形可能なものであれ
ば他の金属管又は合成樹脂管等、その材質は問わない。In the above example, the tapping of the thin-walled pipe 1 is shown as a square stainless steel pipe, but the scope of application of the present invention is not limited to a square pipe, and other polygonal circular cross-section pipes, and the material is suitable for burring. As long as it is plastically deformable, its material is not limited to other metal pipes or synthetic resin pipes.
【0011】[0011]
【発明の効果】以上のように構成されるこの発明の薄肉
管及びその加工方法によれば、プレス加工によるタップ
加工のための下孔用スカート部の形成が不可能な薄肉管
であっても、ねじ切り用補助プレートの溶着や溶接後の
フラックス除去、洗浄、鉄の場合は鐃鈍等の後処理作業
を必要とせず、けがきやセンターポンチ程度の前作業で
簡単に下孔加工及びタップ加工ができる。その結果作業
能率及び加工コストの点できわめて経済的になる。According to the thin-walled pipe and the processing method thereof of the present invention configured as described above, even a thin-walled pipe in which the pilot hole skirt portion for tapping by press working cannot be formed. It does not require post-processing such as welding of auxiliary plate for thread cutting, flux removal after welding, cleaning, and blunting in the case of iron, and easy preparation of holes and taps by pre-work such as marking and center punching. You can As a result, it becomes extremely economical in terms of work efficiency and processing cost.
【0012】また本発明の加工用工具は刃先部分の切削
機能を低下させ又は減殺させることで孔あけ時に薄肉管
の周壁をセンターから押し広げるようにして円筒状又は
円筒片状のかえりを形成し、薄肉の周壁の歪みだけでは
足りないリードを確保することができ、上述したタップ
加工を可能ならしめる効果がある。Further, the machining tool of the present invention forms a cylindrical or cylindrical piece-like burr by lowering or diminishing the cutting function of the cutting edge portion so as to push the peripheral wall of the thin-walled pipe from the center at the time of drilling. However, it is possible to secure a lead that is not sufficient only by the distortion of the thin peripheral wall, and there is an effect that the above-described tapping is possible.
【図1】 タップ加工された本発明の薄肉管とタップに
よるその加工方法の一例を示す断面斜視図である。FIG. 1 is a cross-sectional perspective view showing an example of a tapped thin-walled pipe of the present invention and a tapping method thereof.
【図2】 本発明の加工具であるタップの部分拡大図で
ある。FIG. 2 is a partially enlarged view of a tap which is a processing tool of the present invention.
【図3】 (A),(B)は本発明の加工具であるドリ
ルと、タップの部分拡大図である。3 (A) and 3 (B) are partially enlarged views of a drill, which is a processing tool of the present invention, and a tap.
1 薄肉管 2 周壁 3 タップ孔 3a 下孔 4 かえり 6 タップ 6b,8a 刃先部(錐部) 6g,8c 加工部 1 Thin-walled tube 2 Circumferential wall 3 Tap hole 3a Lower hole 4 Burr 6 Tap 6b, 8a Blade edge (cone) 6g, 8c Processed part
Claims (3)
円筒片状のかえり(4)を突出形成し、該かえり(4)
にタップ加工した薄肉管。1. A burr (4) having a cylindrical shape or a cylindrical piece is formed on the inner surface side of the thin peripheral wall (2) so as to project therefrom, and the burr (4) is formed.
Thin-walled pipe tapped on.
面側にねじピッチの不足を補う肉厚方向の筒状又は筒片
状のかえり(4)を形成するバーリング加工により下孔
(3a)を穿設し、該下孔(3a)にタップ加工するこ
とを特徴とした薄肉管のタップ加工方法。2. A pilot hole is formed by a burring process which forms a cylindrical or tubular piece-like burr (4) in the thickness direction on the inner surface side of the peripheral wall (2) of the thin-walled pipe (1) to make up for a lack of screw pitch. A method of tapping a thin-walled pipe, characterized in that (3a) is bored and tapped into the pilot hole (3a).
能を低減又は減殺させる加工(6g)を施し、少なくと
も下端部外径にタップ下孔の径を備えた錐部(6b)を
形成してなるバーリング加工用工具。3. A sharpened angle (α) is used as an acute angle, and the cutting edge is processed (6g) to reduce or reduce the cutting function, and at least the outer diameter of the lower end portion is formed with a conical portion (6b) having the diameter of the tap pilot hole. Tool for burring process.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32799891A JPH05138439A (en) | 1991-11-15 | 1991-11-15 | Tapped thin tube and method and tool for tapping |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32799891A JPH05138439A (en) | 1991-11-15 | 1991-11-15 | Tapped thin tube and method and tool for tapping |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05138439A true JPH05138439A (en) | 1993-06-01 |
Family
ID=18205366
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32799891A Pending JPH05138439A (en) | 1991-11-15 | 1991-11-15 | Tapped thin tube and method and tool for tapping |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05138439A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7144208B2 (en) * | 2004-06-07 | 2006-12-05 | Kennametal Inc. | Low torque tap |
JP2007125623A (en) * | 2005-11-01 | 2007-05-24 | Honda Motor Co Ltd | Screw forming method, screw forming device and screw forming tool |
US7357606B1 (en) * | 2006-02-03 | 2008-04-15 | United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Self-advancing step-tap tool |
US7553114B2 (en) | 2001-04-30 | 2009-06-30 | Sandvik Intellectual Property Ab | Thread cutting tap and a method of its manufacture |
-
1991
- 1991-11-15 JP JP32799891A patent/JPH05138439A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7553114B2 (en) | 2001-04-30 | 2009-06-30 | Sandvik Intellectual Property Ab | Thread cutting tap and a method of its manufacture |
US7144208B2 (en) * | 2004-06-07 | 2006-12-05 | Kennametal Inc. | Low torque tap |
JP2007125623A (en) * | 2005-11-01 | 2007-05-24 | Honda Motor Co Ltd | Screw forming method, screw forming device and screw forming tool |
JP4572157B2 (en) * | 2005-11-01 | 2010-10-27 | 本田技研工業株式会社 | Thread forming method and screw forming apparatus |
US7357606B1 (en) * | 2006-02-03 | 2008-04-15 | United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Self-advancing step-tap tool |
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