JPH056017Y2 - - Google Patents
Info
- Publication number
- JPH056017Y2 JPH056017Y2 JP741989U JP741989U JPH056017Y2 JP H056017 Y2 JPH056017 Y2 JP H056017Y2 JP 741989 U JP741989 U JP 741989U JP 741989 U JP741989 U JP 741989U JP H056017 Y2 JPH056017 Y2 JP H056017Y2
- Authority
- JP
- Japan
- Prior art keywords
- cutting
- chaser
- chasers
- cemented carbide
- blade
- 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
- 238000005520 cutting process Methods 0.000 claims description 35
- 239000011195 cermet Substances 0.000 claims description 9
- 238000003754 machining Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Nonmetal Cutting Devices (AREA)
- Chemical Vapour Deposition (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、油井管などのねじ切りに用いるチ
エザーに関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cheeser used for thread cutting of oil country tubular goods and the like.
複数個のチエザーを組合わせ、各チエザーに切
込み時期がずれるようにピツチをずらして設けた
刃でねじを切り進める方法は、生産性に優れるこ
とから、油井管など量産のねじ切りによく採用さ
れている。この場合、各々が３個の切刃を持つチ
エザーを３枚組合わせて使用するのが一般であ
り、合計９個の切刃によつてねじ形状が創成され
る。
The method of cutting threads by combining multiple chasers and using blades with staggered cutting pitches on each chaser at different cutting times is highly productive and is often used to cut threads for mass production such as oil country tubular goods. There is. In this case, it is common to use a combination of three chasers each having three cutting blades, and a thread shape is created by a total of nine cutting blades.
この３枚の組合わせチエザーは、第１図に示す
ものとほぼ同様の構成である。このように、No.１
のチエザーには、，，の切刃を、No.２のチ
エザーには．，の切刃を、また、No.３のチ
エザーには，，の切刃を各々設けてNo.１〜
３を周方向に所定間隔で配置し、〜の切刃を
若番側から順次ワークに切込ませて仕上げ刃で
完成されたねじ形状を作り出す。 This three-piece combination chaser has a configuration substantially similar to that shown in FIG. In this way, No.1
The No. 2 chaser has a cutting blade of ,, and the No. 2 chaser has a . , and the No. 3 chaser is provided with a cutting blade of , respectively.
3 are arranged at predetermined intervals in the circumferential direction, and the cutting blades of .
なお、従来のチエザーにおいては、第３図に示
すように、の仕上げ刃を除いてそれぞれの切刃
の取代（半径方向切込み量）をほぼ均等に配分し
てある。 In addition, in the conventional chaser, as shown in FIG. 3, the machining allowance (radial depth of cut) of each cutting edge is distributed almost equally, except for the finishing edge.
また、チエザーの材種としては、超硬合金の母
材上に硬質被覆層を設けた被覆超硬合金や無垢の
超硬合金などがあるが、中でも寿命の点で被覆超
硬合金が多用される傾向にある。 In addition, the types of materials for chasers include coated cemented carbide, which has a hard coating layer on a cemented carbide base material, and solid cemented carbide, but coated cemented carbide is often used because of its longevity. There is a tendency to
チエザーによる加工では、先に述べたように、
仕上げ刃によつて完全なねじ形状が創成されるた
め、仕上げ刃がたとえ局部的にしろ、摩耗したり
欠損したりすると良好なねじが得られず、チエザ
ーの交換が必要になる。
In machining with a cheeser, as mentioned earlier,
Since a perfect thread shape is created by the finishing blade, if the finishing blade becomes worn or damaged, even locally, a good thread cannot be obtained and the chaser needs to be replaced.
ところが、仕上げ刃を有する最老番チエザー
（第１図のNo.３）は、他のチエザーよりも少ない
摩耗或いは欠損で寿命となるにも拘らず、従来の
チエザーは、No.１〜３をいずれも同一材種の材料
で形成しており、そのため、超硬合金を材料にす
ると最老番チエザーの摩耗に対する耐久時間が不
足し、一方、被覆超硬合金を材料にすると高硬度
の被覆層が微小欠損を生じ易いために同じ最老番
チエザーの欠けに対する寿命が同一材種で作られ
た他のチエザーの1/2〜2/3程度になつてしまうと
云う問題が生じている。 However, although the oldest chaser with a finished blade (No. 3 in Figure 1) has a lifespan with less wear or damage than other chasers, conventional chasers have no. Both of them are made of the same grade of material, so if cemented carbide is used, the durability against wear of the oldest chaser is insufficient, while if coated cemented carbide is used, a high hardness coating layer is required. The problem has arisen that the lifespan of the same oldest chaser against chipping is about 1/2 to 2/3 that of other chasers made of the same type of material because of the tendency for micro-defects to occur.
なお、最老番チエザーが他のチエザーよりも早
く寿命になると、一般には全個のチエザーを交換
する場合が多く、まだ使用可能なNo.１，２のチエ
ザーが無駄に廃棄され、経済ロスが大きくなる。 In addition, when the oldest cheezer reaches the end of its lifespan earlier than the other cheezers, generally all the cheezers are replaced, and the 1st and 2nd cheezers that are still usable are wasted, resulting in economic loss. growing.
そこで、この考案は、最老番チエザーの寿命を
他のチエザーの寿命と平均化するところまで延長
することを目的としている。 Therefore, the purpose of this invention is to extend the life of the oldest cheezer to the point where it is equal to the life of the other cheezers.
上記の問題点を無くすため、この考案において
は、仕上げ刃を有するチエザーをサーメツトで、
また、その他のチエザーはいずれも被覆超硬合金
又は超硬合金で形成すると共に上記仕上げ刃を有
するチエザーの各切刃の半径方向切込み量Ｓを他
のチエザーの各切刃の半径方向切込み量S1よりも
小さくした構成を採用する。
In order to eliminate the above problems, in this invention, the chaser with the finishing blade is made of cermet.
In addition, all other chasers are made of coated cemented carbide or cemented carbide, and the radial depth of cut S of each cutting edge of the chaser having the above-mentioned finished blade is set to the radial depth of cut S of each cutting edge of the other chasers. Adopt a configuration smaller than 1 .
なお、この考案の効果を最大限に引き出すため
には、上記Ｓを0.050〜0.254mm、S1を0.166〜
0.322mmの範囲に設定するとよい。 In addition, in order to maximize the effect of this invention, the above S should be 0.050 to 0.254 mm, and S 1 should be 0.166 to 0.254 mm.
It is recommended to set it within the range of 0.322mm.
サーメツトは主として鋼の高速切削分野で使用
される工具材料であつて、チエザーに利用した場
合にも下記の特徴が見られる。
Cermet is a tool material mainly used in the field of high-speed cutting of steel, and the following characteristics can be seen when it is used in chasers.
(1)主成分のTiCは高硬度で耐摩耗性がよい。(1) The main component, TiC, has high hardness and good wear resistance.
(2) 複合構造の被覆超硬合金と違つて単一構造で
あるので切刃の微小欠損が生じ難い。(2) Unlike coated cemented carbide, which has a composite structure, it has a single structure, so it is less likely to cause micro-defects on the cutting edge.
(3) Ticは耐溶着性が良く、加えてサーメツト工
具は被覆超硬合金工具に比べて表面粗さが緻密
で滑らかな切刃が得られるため、ねじの表面粗
さが改善される。(3) Tic has good adhesion resistance, and in addition, cermet tools have a finer surface roughness than coated cemented carbide tools and can produce smoother cutting edges, improving the surface roughness of screws.
(4)高速切削が可能。(4) High-speed cutting is possible.
これ等の特徴は最老番チエザーの寿命改善に有
効に作用するが、この特徴を生かすのみでは考案
の目的達成は叶わない。何故なら、サーメツトは
被覆超硬合金や超硬合金に比べて靱性が低く欠損
し易い。これに対し、従来のチエザーは第３図に
示すように仕上げ刃を除く各刃の取代がほぼ同じ
であるので、サーメツトで作ると第１図の，
の切刃に対する切削負荷が過大になつてこれ等の
切刃が欠け易くなる。しかしながら、この考案に
よれば最老番チエザーの各刃については切込み量
を他のチエザーの切刃のそれよりも少なくして切
削負荷を軽減しているため、欠損による寿命短縮
もなく、全個のチエザー間の寿命差が小さくな
る。 These features effectively work to improve the lifespan of the oldest Cheezer, but the purpose of the invention cannot be achieved only by making use of these features. This is because cermet has lower toughness than coated cemented carbide or cemented carbide and is more likely to break. On the other hand, as shown in Figure 3, in a conventional chaser, the machining allowance for each blade except for the finishing blade is almost the same, so if it is made of cermet, the machining allowance shown in Figure 1 is
The cutting load on the cutting edges becomes excessive, making these cutting edges more likely to chip. However, according to this invention, the depth of cut for each blade of the oldest chaser is smaller than that of the cutting blades of other chasers to reduce the cutting load, so there is no shortening of the lifespan due to chipping, and all The life difference between the chasers becomes smaller.
第１図に示す実施例のチエザーは、No.１〜３の
うちNo.１，２を被覆超硬合金で、No.３をサーメツ
トで各々形成してある。
In the chaser of the embodiment shown in FIG. 1, of Nos. 1 to 3, Nos. 1 and 2 are made of coated cemented carbide, and No. 3 is made of cermet.
また、これ等のチエザーに設ける〜の切刃
は、第２図に示すように、８山ラウンドねじの場
合、，，の半径方向切込み量が共に0.10
mm、，，，，のそれが各々0.305mmと
なる大きさにしてある。この方法は、バツトレス
ねじにも適用可能である。 In addition, as shown in Figure 2, the cutting edges of ~ provided on these chasers have a radial depth of cut of 0.10 in the case of an 8-thread round screw.
The sizes of mm, , , , are each 0.305 mm. This method is also applicable to buttress screws.
第４図は、例示のチエザーと従来チエザーの寿
命の比較結果を示している。この図から判るよう
に、従来チエザーは３枚セツトで油井管のねじ切
に使用した場合、No.３のねじ加工数（平均値）が
極端に少なく、全体の交換時期がそのNo.３のチエ
ザーによつて決定されるのに対し、この考案のチ
エザーはサーメツトで形成されたNo.３の寿命が従
来の約２倍に高まつてNo.１〜３の各寿命差が非常
に小さくなつているため、組合せチエザーの全個
の有効活用が計れる。 FIG. 4 shows a comparison of the lifespans of the exemplary chaser and the conventional chaser. As can be seen from this figure, when a conventional chaser is used in a set of three for threading oil country tubular goods, the number of screws machined for No. 3 (average value) is extremely small, and the overall replacement time for the No. 3 chaser is extremely low. In contrast, in this invention, the life of No. 3, which is made of cermet, is approximately twice as long as that of the conventional one, and the difference in the lives of No. 1 to No. 3 is extremely small. Therefore, it is possible to make effective use of all the pieces of the combined cheeser.
以上述べたように、この考案のチエザーは、最
老番チエザーのみをサーメツトで形成すると共に
このチエザーの各切刃の切削負荷を軽減すること
により、最老番チエザーの寿命を他のチエザーの
それとほぼ同等のレベルまで高めたものであるか
ら、最老番チエザーの早期の交換や使用可能な他
のチエザーの無駄な交換が無くなり、従来チエザ
ーに比して工具費の面で非常に有利になる。
As mentioned above, in this invention, only the longest number of chasers are made of cermet, and the cutting load on each cutting edge of this number of chasers is reduced, so that the life of the oldest number of chasers is longer than that of other chasers. Since it has been improved to almost the same level, there is no need to quickly replace the oldest chaser or wasteful replacement of other usable chasers, making it extremely advantageous in terms of tool costs compared to conventional chasers. .
また、チエザーの交換時期が延びる（交換回数
が減る）ため、ねじ切り設備の稼動率も高まり、
工具費の低減効果とあいまつてねじの加工コスト
が大巾に低減されると云う効果が得られる。 Additionally, the time required to replace the chaser is extended (reduced number of replacements), which increases the operating rate of the thread cutting equipment.
Together with the effect of reducing tool costs, the effect of greatly reducing the processing cost of screws can be obtained.
第１図の、ａ，ｂ，ｃはこの考案のチエザーの
一例を示す側面図、第２図は〜の切刃の取代
の一例を示す線図、第３図は従来チエザーの各切
刃の取代を示す線図、第４図は寿命の比較結果を
示す棒グラフである。
No.１〜３……チエザー、〜……切刃。
In Fig. 1, a, b, and c are side views showing an example of the chaser of this invention, Fig. 2 is a diagram showing an example of the machining allowance of the cutting blades of ~, and Fig. 3 is a diagram showing an example of the machining allowance of the cutting blades of the conventional chaser. The line diagram showing the machining allowance and FIG. 4 are bar graphs showing the comparison results of the service life. No.1~3...Cheezer, ~...Cutting blade.
Claims (1)
削刃を設け、その複数個を組合わせて使用する
ねじ切り用チエザーにおいて、仕上げ刃を有す
るチエザーをサーメツトで、また、その他のチ
エザーはいずれも被覆超硬合金又は超硬合金で
形成すると共に上記仕上げ刃を有するチエザー
の各切刃の半径方向切込み量Ｓを他のチエザー
の各切刃の半径方向切込み量S1よりも小さくし
たことを特徴とするチエザー。 (2) 上記Ｓを0.050〜0.254mm、S1を0.166〜0.322
mmの範囲に設定した請求項(1)記載のチエザー。[Scope of Claim for Utility Model Registration] (1) In a thread cutting chaser in which a plurality of divided cutting blades are provided for cutting areas with different cutting orders and the plurality of divided cutting blades are used in combination, the chaser having a finishing blade is made of cermet. , and the other chasers are all made of coated cemented carbide or cemented carbide, and the radial depth of cut S of each cutting edge of the chaser having the above-mentioned finished blade is calculated as the radial depth of cut of each cutting edge of the other chasers. Cheezer is characterized by being smaller than S 1 . (2) The above S is 0.050~0.254mm, S 1 is 0.166~0.322
The cheeser according to claim (1), wherein the cheezer is set to a range of mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP741989U JPH056017Y2 (en) | 1989-01-24 | 1989-01-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP741989U JPH056017Y2 (en) | 1989-01-24 | 1989-01-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0326433U JPH0326433U (en) | 1991-03-18 |
| JPH056017Y2 true JPH056017Y2 (en) | 1993-02-17 |
Family
ID=31511076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP741989U Expired - Lifetime JPH056017Y2 (en) | 1989-01-24 | 1989-01-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH056017Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4543372B2 (en) * | 2004-04-30 | 2010-09-15 | 住友金属工業株式会社 | Thread cutting method for steel pipe |
| KR100881433B1 (en) * | 2007-05-14 | 2009-02-23 | 주식회사 두부마을 | Bean curd cracker manufacturing methods |
-
1989
- 1989-01-24 JP JP741989U patent/JPH056017Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0326433U (en) | 1991-03-18 |
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