JPS628595B2 - - Google Patents
Info
- Publication number
- JPS628595B2 JPS628595B2 JP55139554A JP13955480A JPS628595B2 JP S628595 B2 JPS628595 B2 JP S628595B2 JP 55139554 A JP55139554 A JP 55139554A JP 13955480 A JP13955480 A JP 13955480A JP S628595 B2 JPS628595 B2 JP S628595B2
- Authority
- JP
- Japan
- Prior art keywords
- hardened layer
- threaded
- male
- threaded portion
- female
- 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
Links
- 238000003466 welding Methods 0.000 claims description 9
- 238000009792 diffusion process Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- 239000000047 product Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000005553 drilling Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005121 nitriding Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910052612 amphibole Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Description
本発明はねじ部強化ボーリングロツドに係り、
特に素管部両端のめねじ部およびおねじ部の外周
部を元素拡張処理により形成された硬化層を有す
るねじ部強化ボーリングロツドに関する。
ボーリングロツドは鉱物もしくは石油等の地層
もしくは岩石堀削時にボーリングマシンの駆動を
錐先であるダイヤモンドビツトや超硬合金ビツト
などに伝達する鋼管であるが、近時ボーリングマ
シンおよびビツト類の高性能化に伴い、その中間
の駆動力伝達機能を要するボーリングロツドにも
苛酷の条件下での使用が要求されるようになつ
た。
ボーリングロツドは通常高張力構造用鋼管より
成る素管部の両端にめねじ部およびおねじ部を溶
接して成るが、その最弱部は肉薄となるねじ部で
ある。従来のボーリングロツドにおいては、ねじ
部はオーバーラツプ現象や切断事故を起し易く、
強度的に最も弱い部分であると同時に、ねじ部自
体のかじり現象を伴なうほか、特にめねじ部の管
外周部は摩耗し易い状況にある。かくの如く、ボ
ーリングロツドにおいてねじ部が最弱部であるた
めにねじ部の寿命によつてボーリングロツドの寿
命が決定されることになつていた。
かくの如き最弱部のねじ部の補強対策として、
ねじ部に高強度材料を使用し、素管部は従来材料
もしくは低強度材料を使用して素管部の両端にめ
ねじ部およびおねじ部を溶接して成るボーリング
ロツドが開発された。しかしねじ部に高強度材料
を用いただけでは穴まがりや破砕層のほか超深度
ボーリングの如き過酷な堀削条件を克服すること
ができないという問題があつた。
これらの対策として近時、ねじ部の外周部に高
周波誘導加熱により焼入硬化層を形成して耐摩耗
性を付与するか、又は硬質クロムめつきやNi−
Ｐめつきを施すことが行なわれている。しかしね
じ部を強化したかかるボーリングロツドでは、な
おかつめつき部が剥離し易く、また水素脆性等の
欠点があり、更に高周波誘導加熱処理のものは加
熱深度による脆性問題等が避けることができな
い。
本発明の目的は従来のねじ部強化型のボーリン
グロツドの前記諸欠点を克服し、すぐれたねじ部
を有してボーリングロツド全体の寿命の飛躍的延
長を達成し得るねじ部強化ボーリングロツドを提
供するにある。
本発明の要旨とするところは次の如くである。
すなわち、素管部の両端に、内部めねじが形成
された中空円筒状めねじ部と外周おねじが形成さ
れた中空円筒状おねじ部とを溶接して成るボーリ
ングロツドにおいて、前記めねじ部の外周面およ
び前記おねじ部のおねじ表面に窒素または硼素の
元素拡散処理による硬化層を形成し、前記めねじ
部のめねじ表面およびめねじ胴付部並びに前記お
ねじ部の内径表面およびおねじ胴付部には前記硬
化層を形成させず、さらに、前記めねじ部の外周
面の硬化層の深さを前記おねじ部のおねじ表面の
硬化層より大にすることを特徴とするねじ部強化
ボーリングロツド、である。
すなわち、本発明に使用するボーリングロツド
の素管部としてはJISG 3445、STKM−16Cの如
き冷間加工後の引張強さが63Kg／mm2以上、降伏点
47Kg／mm2以上、伸び12％以上の如き高張力鋼管を
使用し、その両端に熱処理後の引張強さが80Kg／
mm2以上の高張力鋼にそれぞれ第１図ＡおよびＢに
て示す如きめねじ部２およびおねじ部４を溶接し
たものである。
本発明によるめねじ部２およびおねじ部４のそ
れぞれの外周部６および８は、ＮもしくはＢの如
き元素を拡散処理した硬化層６Ａおよび８Ａを有
している。例えば窒化層を有せしめる場合には、
めねじ部２の外周部６には比較的厚い窒化層６Ａ
を有せしめ、おねじ部４の外周部８には比較的薄
い窒化層８Ａを有せしめるようにする。すなわ
ち、めねじ部２は外周部６にのみ硬化層６Ａを設
け、めねじ部の内部ねじ山１０には硬化層を形成
しない。これは接続する他のボーリングロツドの
おねじ部４が硬化層８Ａを有しているので硬軟両
面の接合によつてねじ部のかじりや凝着現象を起
さず、しかも着脱性を良くするためである。
元素拡散処理方法としては窒化等のほか、Ｂを
拡散して素管部の鉄とFeBの硬化層を形成しても
よい。この方法としてはＢの溶融塩電解もしくは
硼砂中に被処理部を埋没して加熱して表面にFeB
硬化層を形成等の公知の方法によることが可能で
ある。めねじ部２の外周部６は直接土砂にさらさ
れ最も耐摩耗性を要求される部分であるので、直
接土砂にさらされないおねじ部４の外周部８Ａよ
りもはるかに深い硬化層とする必要があり、おね
じ部硬化層８Ａの深さ0.05mmに対し、少くとも
0.20mm程度の深さが望ましい。めねじ部およびお
ねじ部の窒化による硬化層と硬度の一例は第２図
に示すとおりである。
なお、おねじ部４の元素硬化処理時にめねじ部
およびおねじ部のそれぞれの胴付部１２，１４を
硬化処理しないようにすることが重要である。こ
れは、他のボーリングロツドの硬化処理しないめ
ねじ部の胴付部１２とおねじ部の胴付部１４との
ねじ嵌合の末端部となるので密着性を要求される
からである。
次に素管部の両端へのそれぞれめねじ部２およ
びおねじ部４の溶接は回転摩擦溶接法によること
が望ましい。これは両管端のカツプリング溶接に
より同時に外ばり取りが可能であるからである。
かくして素管部の両端にそれぞれ元素拡散処理し
ためねじ部２およびおねじ部４を回転摩擦溶接し
て得たボーリングロツドの溶接部は、500〜550℃
に低温焼鈍した後空冷する熱処理を施した後ばり
取り、歪矯正等の仕上げ加工を行つた後最終成品
とするものである。
実施例 １
本発明によるボーリングロツドの窒化処理によ
つて強化したねじ部の実施例について説明する。
ねじ部に使用した鋼材は特殊高張力鋼であつて、
その化学成分は第１表のとおりである。
The present invention relates to a thread reinforced boring rod,
In particular, the present invention relates to a thread-reinforced boring rod having a hardened layer formed by elemental expansion treatment on the outer periphery of the female and male threads at both ends of the blank tube. A boring rod is a steel pipe that transmits the driving force of a boring machine to a diamond bit or a cemented carbide bit, which is the tip of the drill bit, when drilling geological formations or rocks for minerals or oil. Along with this trend, boring rods that require an intermediate driving force transmission function are also required to be used under severe conditions. Boring rods are usually made by welding a female threaded part and a male threaded part to both ends of a raw pipe part made of high-tensile structural steel pipe, and the weakest part is the threaded part where the wall is thin. In conventional boring rods, the threaded part is prone to overlapping phenomena and cutting accidents.
This is the weakest part in terms of strength, and at the same time, the threaded part itself is subject to galling, and the outer peripheral part of the pipe, especially the female threaded part, is susceptible to wear. As described above, since the threaded part is the weakest part of a boring rod, the lifespan of the boring rod has been determined by the lifespan of the threaded part. As a measure to strengthen the weakest threaded part,
A boring rod has been developed in which the threaded part is made of a high-strength material, the raw pipe part is made of a conventional material or a low-strength material, and the female and male threads are welded to both ends of the raw pipe part. However, there was a problem in that simply using a high-strength material for the threaded portion was unable to overcome harsh drilling conditions such as boring, fractured layers, and ultra-deep boring. As a countermeasure to these problems, recent efforts have been made to form a hardened layer on the outer periphery of the threaded part using high-frequency induction heating to provide wear resistance, or to provide hard chrome plating or Ni-
P plating is applied. However, such boring rods with strengthened threaded portions still have disadvantages such as easy peeling of the mating portions and hydrogen embrittlement, and furthermore, those subjected to high frequency induction heating cannot avoid problems of embrittlement due to depth of heating. The object of the present invention is to overcome the above-mentioned drawbacks of conventional boring rods with reinforced threads, and to provide a thread-reinforced boring rod that has excellent threads and can dramatically extend the life of the entire boring rod. It is to provide the code. The gist of the present invention is as follows. That is, in a boring rod formed by welding a hollow cylindrical female threaded part with an internal female thread and a hollow cylindrical male threaded part with an outer circumferential male thread at both ends of the raw pipe part, the female thread is A hardened layer is formed by an elemental diffusion treatment of nitrogen or boron on the outer circumferential surface of the part and the male thread surface of the male thread part, and and the hardened layer is not formed on the male threaded portion, and the depth of the hardened layer on the outer peripheral surface of the female threaded portion is greater than the hardened layer on the male thread surface of the male threaded portion. This is a boring rod with a reinforced threaded part. In other words, the material pipe of the boring rod used in the present invention has a tensile strength of 63 kg/mm 2 or more after cold working, such as JISG 3445, STKM-16C, and a yield point of 63 kg/mm 2 or more.
We use high-tensile steel pipes with a tensile strength of 47Kg/mm 2 or more and an elongation of 12% or more, and the tensile strength after heat treatment is 80Kg/mm at both ends.
A female threaded portion 2 and a male threaded portion 4 as shown in FIGS. 1A and 1B are welded to high tensile strength steel having a diameter of mm 2 or more. The outer circumferential parts 6 and 8 of the female threaded part 2 and the male threaded part 4 according to the present invention have hardened layers 6A and 8A, respectively, which have been subjected to a diffusion treatment with an element such as N or B. For example, in the case of having a nitride layer,
A relatively thick nitride layer 6A is provided on the outer peripheral portion 6 of the female threaded portion 2.
The outer circumferential portion 8 of the male threaded portion 4 is provided with a relatively thin nitride layer 8A. That is, the female threaded portion 2 is provided with a hardened layer 6A only on the outer peripheral portion 6, and no hardened layer is formed on the internal thread 10 of the female threaded portion. This is because the male threaded part 4 of the other boring rod to be connected has the hardened layer 8A, so the joining of both hard and soft surfaces prevents galling or adhesion of the threaded part, and also improves attachment and detachment. It's for a reason. As an elemental diffusion treatment method, in addition to nitriding, B may be diffused to form a hardened layer of iron and FeB in the raw tube portion. This method involves molten salt electrolysis of B or by burying the treated part in borax and heating it to form FeB on the surface.
It is possible to use a known method such as forming a hardened layer. The outer periphery 6 of the female threaded portion 2 is directly exposed to earth and sand and is the part that requires the most wear resistance, so it needs to be a much deeper hardened layer than the outer periphery 8A of the male thread 4 that is not directly exposed to earth and sand. There is at least 0.05mm depth of hardened layer 8A of male thread part.
A depth of about 0.20mm is desirable. An example of the hardened layer and hardness of the female threaded portion and the male threaded portion due to nitridation is shown in FIG. In addition, it is important to avoid hardening the respective shank portions 12 and 14 of the female threaded portion and the male threaded portion when the male threaded portion 4 is subjected to the elemental hardening treatment. This is because this is the end of the threaded fit between the female threaded shank portion 12 and the male threaded shank portion 14 that are not hardened in other boring rods, and therefore tightness is required. Next, it is preferable to weld the female threaded portion 2 and the male threaded portion 4 to both ends of the raw pipe portion by rotary friction welding. This is because the external deburring can be done at the same time by coupling welding both ends of the tube.
In this way, the welded part of the boring rod obtained by rotary friction welding the female threaded part 2 and the male threaded part 4, which have been subjected to elemental diffusion treatment at both ends of the raw pipe part, can be heated at a temperature of 500 to 550°C.
After being heat-treated by low-temperature annealing and air-cooling, the final product is made into a final product after performing finishing processes such as deburring and straightening distortion. Example 1 An example of a threaded portion of a boring rod according to the present invention strengthened by nitriding treatment will be described.
The steel material used for the threaded part is special high tensile strength steel,
Its chemical composition is shown in Table 1.
【表】
第１表の組成を有するねじ部材料をねじ加工後
860℃に加熱後水焼れし、その後550℃に焼戻した
る機械的特性値は第２表のとおりである。
更に上記ねじ素材を本発明によりめねじ部２お
よびおねじ部４のそれぞれの外周部を強化処理を
施したが、その詳細ならびに硬化層の深さ、硬度
は第３表のとおりである。[Table] After thread processing of thread material with the composition shown in Table 1
Table 2 shows the mechanical properties of the samples heated to 860°C, water-scorched, and then tempered to 550°C. Further, according to the present invention, the outer peripheral portions of the female threaded portion 2 and male threaded portion 4 of the above-mentioned thread material were subjected to strengthening treatment, and the details, depth and hardness of the hardened layer are as shown in Table 3.
【表】【table】
【表】
実施例 ２
本発明によるボーリングロツドとねじ部の外周
を単に高周波焼入処理し、かつねじ部と素管部の
接合を不活性ガスによるTIG溶接によつた従来[Table] Example 2 The boring rod according to the present invention and the conventional method in which the outer periphery of the threaded part was simply induction hardened and the threaded part and the raw pipe were joined by TIG welding using inert gas.
【表】【table】
【表】
品との、ねじ部、素管部、溶接部別の機械的特別
性の一例は第４表に示すとおりである。
第４表より明らかな如く、本発明品は従来品に
比して次の如き特徴を有している。
(イ) ねじ部が強度のみならず衝撃値がすぐれてい
る。
(ロ) 溶接部は特にすぐれ、従来のTIG溶接による
よりも本発明による回転摩擦溶接による方がは
るかにすぐれていることを示している。
実施例 ３
本発明によるボーリングロツドと従来のボーリ
ングロツドを使用し、同一条件によるＡ鉱山の坑
内ボーリングにおいて使用比較試験を実施し、そ
の寿命を比較した。
(イ) 使用ボーリングロツド
アメリカ鉱山機械規格 AXWL−Ｔ
ねじ部は本発明品ではめねじ部を0.30mm、お
ねじ部を0.05mmの深さにイオン窒化による硬化
層を形成したものを使用し、従来品は単に高周
波焼入を実施したものである。
(ロ) 試験条件
使用掘削機：利根ボーリング製TDP−100S1
ポンプ：利根ボーリング製NAS−3B
送水水質：清浄水
ビツト回転数：85〜170rpm
ビツト荷重：30〜50Kg／cm2
掘削岩質：石英安山岩、泥岩の混合帯
かくの如く、同一条件にて掘削比較試験を実施
した結果本発明品および従来品の寿命はそれぞれ
第５表のとおりである−なお寿命は使用不能まで
の掘削長および継続使用時間にて比較した。[Table] An example of the mechanical characteristics of each threaded part, raw pipe part, and welded part is shown in Table 4. As is clear from Table 4, the product of the present invention has the following characteristics compared to the conventional product. (a) The threaded part has excellent not only strength but also impact value. (b) The welds are particularly good, showing that the rotary friction welding of the present invention is much better than the conventional TIG welding. Example 3 A comparative test was conducted using a boring rod according to the present invention and a conventional boring rod in underground boring at mine A under the same conditions, and their lives were compared. (a) Boring rod used American Mining Equipment Standard AXWL-T For the threaded parts of the product of this invention, a hardened layer formed by ion nitriding is used at a depth of 0.30 mm for the female thread and 0.05 mm for the male thread. , conventional products simply undergo induction hardening. (b) Test conditions Excavator used: TDP-100S1 made by Tone Boring Pump: NAS-3B made by Tone Boring Water quality: Clean water Bit rotation speed: 85 to 170 rpm Bit load: 30 to 50 Kg/cm 2 Drilling rock quality: Quartz andesite , a mixed zone of mudstone As shown above, as a result of conducting comparative drilling tests under the same conditions, the lifespan of the inventive product and the conventional product are shown in Table 5.The lifespan depends on the length of excavation until unusable and continuous use Comparison was made in terms of time.
【表】
実施例 ４
実施例３と同様に地熱井ボーリングに本発明に
よるものと従来品のボーリングロツドを使用し同
一試験条件で性能の比較試験を実施した。
(イ) 使用ボーリングロツド
アメリカ鉱山機械規格 HQT
ねじ部は本発明品ではめねじ部に0.20mm、お
ねじ部に0.05mmの深さのイオン窒化による硬化
層をそれぞれ外周部に形成したものを使用し、
従来品は単に高周波焼入を実施したものであ
る。
(ロ) 試験条件
使用掘削機：利根ボーリング製 HLL
ポンプ：利根ボーリング製 HLL
送水水質：清浄水
ビツト回転数：80rpm
ビツト荷重：1500〜5000Kg
掘削岩質：角閃輝石、凝灰角礫岩安山岩の混合
帯
上記同一条件にて掘削比較試験を実施した結果
従来品は1500mmの掘削において、ねじ部が摩耗し
て使用不能となつたが、本発明によるボーリング
ロツドは何らの変化もなくなお継続使用が十分可
能の状態であつた。
上記各実施例より明らから如く、本発明による
ねじ部強化ボーリングロツドは、めねじ部および
おねじ部のそれぞれの外周部に元素拡散処理によ
る硬化層を形成するようにしたので、従来品に比
し次の如き効果を収めることができ、その結果飛
躍的な寿命の延長が可能となつた。
(イ) ねじ部のかじり又は凝着現象を起さず着脱性
が良好である。
(ロ) ねじ部の耐摩耗性が著しく向上した。
(ハ) ねじ部の強度も向上し座屈、オーバーラツプ
が発生し難い。[Table] Example 4 As in Example 3, a performance comparison test was conducted under the same test conditions using the boring rod according to the present invention and the conventional product for geothermal well boring. (a) Boring rod used American Mining Equipment Standard HQT The threaded part of the product of this invention has a hardened layer formed by ion nitriding at a depth of 0.20 mm on the female thread part and 0.05 mm on the male thread part on the outer periphery. use,
Conventional products simply undergo induction hardening. (b) Test conditions Excavator used: HLL manufactured by Tone Boring Pump: HLL manufactured by Tone Boring Water quality: Clean water Bit rotation speed: 80 rpm Bit load: 1500 to 5000 Kg Excavation rock quality: Amphibole, tuff breccia, andesite Mixed zone As a result of conducting a comparative drilling test under the same conditions as above, it was found that the threaded part of the conventional product became unusable after 1500 mm of excavation, but the boring rod of the present invention continues to be used without any changes. was fully possible. As is clear from the above embodiments, the thread reinforced boring rod according to the present invention has a hardened layer formed by elemental diffusion treatment on the outer periphery of each of the female threaded portion and the male threaded portion. In comparison, we were able to achieve the following effects, and as a result, it became possible to dramatically extend the lifespan. (b) Easy to attach and detach without causing galling or adhesion of the threaded part. (b) The wear resistance of the threaded portion has been significantly improved. (c) The strength of the threaded portion is also improved, making it difficult for buckling and overlapping to occur.
第１図Ａ，Ｂはそれぞれ本発明によるボーリン
グロツドのめねじ部およびおねじ部を示す断面
図、第２図は本発明によるボーリングロツドのめ
ねじ部およびおねじ部における窒化硬化層の深さ
（mm）と硬度（ＨRA）の関係の一例を示す相関図
である。
２……めねじ部、４……おねじ部、６……めね
じ部外周部、８……おねじ部外周部、６Ａ……め
ねじ部硬化層、８Ａ……おねじ部硬化層、１０…
…ねじ山、１２……めねじ部胴付部、１４……お
ねじ部胴付部。
1A and 1B are cross-sectional views showing the female threaded portion and the male threaded portion of the boring rod according to the present invention, respectively, and FIG. It is a correlation diagram showing an example of the relationship between depth (mm) and hardness (H RA ). 2...Female thread part, 4...Male thread part, 6...Female thread part outer periphery, 8...Male thread part outer periphery, 6A...Female thread part hardened layer, 8A...Male thread part hardened layer, 10...
...Screw thread, 12...Female thread part, shank part, 14...Male thread part, shank part.
Claims (1)
空円筒状めねじ部と外周おねじが形成された中空
円筒状おねじ部とを溶接して成るボーリングロツ
ドにおいて、前記めねじ部の外周面および前記お
ねじ部のおねじ表面に窒素または硼素の元素拡散
処理による硬化層を形成し、前記めねじ部のめね
じ表面およびめねじ胴付部並びに前記おねじ部の
内径表面およびおねじ胴付部には前記硬化層を形
成させず、さらに、前記めねじ部の外周面の硬化
層の深さを前記おねじ部のおねじ表面の硬化層よ
り大にすることを特徴とするねじ部強化ボーリン
グロツド。1. In a boring rod formed by welding a hollow cylindrical female threaded part with an internal female thread and a hollow cylindrical male threaded part with an outer circumferential male thread at both ends of a raw pipe part, the female threaded part A hardened layer is formed by an elemental diffusion treatment of nitrogen or boron on the outer circumferential surface and the male thread surface of the male thread part, and The hardened layer is not formed on the externally threaded portion, and the hardened layer on the outer peripheral surface of the internally threaded portion is deeper than the hardened layer on the externally threaded surface of the externally threaded portion. Boring rod with reinforced threaded part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13955480A JPS5766290A (en) | 1980-10-06 | 1980-10-06 | Screw reinforced boring rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13955480A JPS5766290A (en) | 1980-10-06 | 1980-10-06 | Screw reinforced boring rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5766290A JPS5766290A (en) | 1982-04-22 |
| JPS628595B2 true JPS628595B2 (en) | 1987-02-24 |
Family
ID=15247962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13955480A Granted JPS5766290A (en) | 1980-10-06 | 1980-10-06 | Screw reinforced boring rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5766290A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5252982U (en) * | 1975-10-15 | 1977-04-15 | ||
| JPS53132447A (en) * | 1977-04-25 | 1978-11-18 | Hughes Tool Co | Tool joint subject to surface hardening that has smooth surface |
-
1980
- 1980-10-06 JP JP13955480A patent/JPS5766290A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5252982U (en) * | 1975-10-15 | 1977-04-15 | ||
| JPS53132447A (en) * | 1977-04-25 | 1978-11-18 | Hughes Tool Co | Tool joint subject to surface hardening that has smooth surface |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5766290A (en) | 1982-04-22 |
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