JPS63237877A - Method of thermally treating rod for rock drill - Google Patents
Method of thermally treating rod for rock drillInfo
- Publication number
- JPS63237877A JPS63237877A JP7016987A JP7016987A JPS63237877A JP S63237877 A JPS63237877 A JP S63237877A JP 7016987 A JP7016987 A JP 7016987A JP 7016987 A JP7016987 A JP 7016987A JP S63237877 A JPS63237877 A JP S63237877A
- Authority
- JP
- Japan
- Prior art keywords
- collar
- shank
- hardness
- rock drill
- coil
- 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
- 239000011435 rock Substances 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 10
- 239000000463 material Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 18
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 238000000137 annealing Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Percussive Tools And Related Accessories (AREA)
- Earth Drilling (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、土木工事現場、砕石場及び鉱山等で使用さ
れるさく岩機用ロッドの熱処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for heat treating rods for rock drills used at civil engineering construction sites, stone crushing yards, mines, etc.
（従来の技術）
第３図に示すように、さく岩機用ロッド１は、全体的に
中空六角形状をなし、先端の超硬チップ５と、さく岩槻
からの力をチップ５に伝達するステム部２と、ロッドの
後方部分に形成されたカラー部３とシャンク部４とを有
する。岩盤７にチップ５を押し当て、六角筒状をなすさ
く岩槻のチャツタブッシング６を断面六角形のシャンク
部４に嵌合した状態で、シャンク部４の後端をさく岩槻
のピストン（図示せず）で打撃する。この打ｌＩ８によ
るロッドの押し込みとブッシング６の回転によるロッド
の回転とを繰り返して、岩盤７を穿孔する。(Prior Art) As shown in FIG. 3, a rock drill rod 1 has a hollow hexagonal shape as a whole, and has a carbide tip 5 at the tip and a stem that transmits force from the rock drill to the tip 5. portion 2, a collar portion 3 and a shank portion 4 formed at the rear portion of the rod. With the chip 5 pressed against the bedrock 7 and the hexagonal cylindrical Iwatsuki chattub bushing 6 fitted into the hexagonal cross-section shank part 4, the Iwatsuki piston (not shown) is pressed against the rear end of the shank part 4. Strike with zu). The rock 7 is drilled by repeating the pushing of the rod by the punch 8 and the rotation of the rod by the rotation of the bushing 6.
この穿孔作業中に、ステム部２は常に曲げ応力を受け、
カラー部３のつけ根（カラー部３とシャンク部４との境
界）が曲げの支点となる。このため、ステム部２及びシ
ャンク部４は高強度にする必要があり、従ってＨＲＣ４
０〜５０程度の硬度に調質する必要がある。一方、カラ
ー部３においては、その中に存在する鍛造シワ疵が折損
起点となるため、カラー部３の中央部は硬度をＨＲＣ４
２程度に調質して靭性を向上させ、シワ疵による切欠感
受性を抑制する必要がある。During this drilling operation, the stem portion 2 is constantly subjected to bending stress.
The base of the collar portion 3 (the boundary between the collar portion 3 and the shank portion 4) serves as a fulcrum for bending. For this reason, the stem portion 2 and shank portion 4 need to be made high in strength, and therefore HRC4
It is necessary to heat it to a hardness of about 0 to 50. On the other hand, in the collar part 3, the forging wrinkles present therein become the starting point for breakage, so the hardness of the central part of the collar part 3 is HRC4.
It is necessary to improve the toughness by refining to about 2 and suppress the notch sensitivity due to wrinkles.
このため、さく岩機用ロッド１はその長手方向に所要の
硬度分布を有する。従来、このような硬度分布をロッド
ｌにもたせるために、シャンク部４とステム部２とを別
個に加熱冷却して焼入れし、カラー部３の中央を非焼入
れのまま存在させるか（分割加熱）、又は、ロッドの全
体を加熱するが、カラー部３の冷却速度を遅（する（全
体加熱）方法が深川されている。Therefore, the rock drill rod 1 has a required hardness distribution in its longitudinal direction. Conventionally, in order to give the rod l such a hardness distribution, the shank part 4 and the stem part 2 are separately heated, cooled, and hardened, and the center of the collar part 3 is left unhardened (divided heating). Alternatively, Fukagawa has proposed a method in which the entire rod is heated, but the cooling rate of the collar portion 3 is slowed down (total heating).
（発明が解決しようとする問題点）
しかしながら、分割加熱の場合には、熱処理作業を局所
的に且つ２回に分けて実施するため、作業が複雑であり
、処理コストが高いという問題点がある。(Problems to be Solved by the Invention) However, in the case of split heating, the heat treatment work is carried out locally and in two parts, so there are problems in that the work is complicated and the processing cost is high. .
一方、全体加熱の場合には、ロッド素材を加熱した後、
シャンク部及びステム部に接触する一方、カラー部には
接触しない金型を、高温のロッド素材に押圧してシャン
ク部及びステム部を接触冷却する。しかしながら、この
方法は、冷却性能が悪く所要の硬度を得ることができな
いと共に、プレスによりパリが発生するという問題点が
ある。On the other hand, in the case of whole heating, after heating the rod material,
A mold that contacts the shank and stem but does not contact the collar is pressed against the hot rod material to cool the shank and stem by contact. However, this method has problems in that the cooling performance is poor and it is not possible to obtain the required hardness, and in addition, burrs occur during pressing.
また、全体加熱した、カラー部に断熱材を配設した後、
シャンク部及びステム部を噴出空気で冷却する方法もあ
るが、この場合も冷却性能が悪くて所望の硬度を得るこ
とができないと共に、断熱材で空気を遮蔽する作業に手
間がかかり非能率的であるという難点がある。In addition, after heating the entire body and installing insulation material in the collar part,
There is also a method of cooling the shank and stem with jetted air, but in this case too, the cooling performance is poor and the desired hardness cannot be obtained, and the work of shielding the air with heat insulating material is time-consuming and inefficient. There is a drawback.
この発明はかかる事情に鑑みてなされたものであって、
所望の硬度パターンを有するさく岩機用ロフトを確実に
且つ高効率で得ることができるさく岩機用ロフトの熱処
理方法を提供することを目的とする。This invention was made in view of such circumstances, and
It is an object of the present invention to provide a method for heat treating a loft for a rock drill, which can reliably and highly efficiently obtain a loft for a rock drill having a desired hardness pattern.
（問題点を解決するための手段）
この発明に係るさく岩機用ロフトの熱処理方法は、さく
岩機用ロッド素材を焼入れ処理して所定の硬度を得た後
、そのシャンク部に非磁性の金属又は合金でつ（られた
筒体を嵌合し、そのカラー部の外周にコイルを配設して
このコイルを介して素材を高周波誘導加熱して焼鈍処理
することを特徴とする。(Means for Solving the Problems) In the heat treatment method for a loft for a rock drill according to the present invention, after a rock drill rod material is quenched to obtain a predetermined hardness, a non-magnetic It is characterized in that a cylinder made of metal or alloy is fitted, a coil is disposed around the outer periphery of the collar part, and the material is annealed by high-frequency induction heating via this coil.
（作用）
この発明においては、ロッド素材全体を焼入れ処理して
、所望の硬さく例えば、ＨＲＣ５０）を得た後、カラー
部外周にコイルを配設して高周波誘導加熱することによ
り、このカラー部を焼鈍処理する。(Function) In the present invention, after the entire rod material is hardened to obtain a desired hardness (for example, HRC50), a coil is disposed around the outer periphery of the collar portion and high-frequency induction heating is applied to the collar portion. is annealed.
この場合に、シャンク部には鋼管等の非磁性の金属又は
合金からなる筒体を嵌合しである。従って、コイルへの
通電により発生する磁場は非磁性筒体に吸収されてシャ
ンク部には到達しない、このため、シャンク部は加熱さ
れず、焼鈍を受けない、従って、カラー部のみ焼鈍を受
けて硬度が低下し、カラー部は靭性が向上すると共に、
シャンク部は初期の焼入れ硬度を保持する。In this case, a cylinder made of a non-magnetic metal or alloy such as a steel pipe is fitted into the shank portion. Therefore, the magnetic field generated by energizing the coil is absorbed by the non-magnetic cylinder and does not reach the shank. Therefore, the shank is not heated and is not annealed. Therefore, only the collar is annealed. The hardness decreases, the toughness of the collar improves, and
The shank retains its initial quenched hardness.
（実施例）
以下、添付の図面を参照してこの発明の実施例について
具体的に説明する。第１図はこの発明の一実施例を示す
、さく岩機用インサートビットの素材１１はシャンク部
１２及びこのシャンク部１２に続くカラー部１３を有す
る。(Embodiments) Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 shows an embodiment of the present invention, in which a material 11 of an insert bit for a rock drill has a shank portion 12 and a collar portion 13 following the shank portion 12.
この素材１１を、先ず、所定の焼入れ温度に加熱して後
、急冷して焼入れする。必要に応じて、この焼入れ材を
焼戻し処理する。これにより、素材１１の全体を、例え
ば、ＨＲＣ５０の高硬度に調整する。This material 11 is first heated to a predetermined hardening temperature, then rapidly cooled and hardened. If necessary, this hardened material is tempered. As a result, the entire material 11 is adjusted to have a high hardness of, for example, HRC50.
次いで、第１図に示すように、素材１１のシャンク部１
２に銅製の筒体１４を嵌合する。そして、コイル１５の
中に素材１１を挿入し、素材１１のカラー部１３を取り
囲むようにコイル１５を配設する６次いで、コイル１５
に高周波電圧を印加し、カラー部１３を高周波加熱する
。カラー部１３を所定温度に加熱した後、放冷する。Next, as shown in FIG. 1, the shank portion 1 of the material 11 is
A copper cylindrical body 14 is fitted to 2. Then, the material 11 is inserted into the coil 15, and the coil 15 is arranged so as to surround the collar portion 13 of the material 11.
A high frequency voltage is applied to the collar portion 13 to heat the collar part 13 with high frequency. After heating the collar part 13 to a predetermined temperature, it is allowed to cool.
この場合に、コイル１５に高周波電力を投入すると、コ
イル１５から磁場が発生して索材１１の内部に誘導電流
が発生する。この誘導電流により発熱して素材１１が加
熱されるが、磁束は非磁性の銅製筒体１４に吸収されて
シャンク部１２には到達しない、このため、シャンク部
１２は加熱されない゛、また、シャンク部１２は良熱伝
導性の銅製筒体１４に接触しているので、カラー部１３
が加熱されても、この熱は筒体１４により抑制されてシ
ャンク部１２は伝達しにくい、従って、この高周波加熱
によって、カラー部１３のみが加熱され、シャンク部１
２は加熱されず、その境界は極めて明確である。これに
より、カラー部１３のみが焼鈍処理を受けたことになり
、カラー部１３が焼鈍による軟化を受けて硬度が低下す
ると共に、靭性が向上する。一方、シャンク部１２は焼
入れ処理による高硬度を維持している。In this case, when high frequency power is applied to the coil 15, a magnetic field is generated from the coil 15 and an induced current is generated inside the rope material 11. This induced current generates heat and heats the material 11, but the magnetic flux is absorbed by the non-magnetic copper cylinder 14 and does not reach the shank portion 12. Therefore, the shank portion 12 is not heated. Since the portion 12 is in contact with the copper cylindrical body 14 having good thermal conductivity, the collar portion 13
Even if the collar part 13 is heated, this heat is suppressed by the cylinder 14 and difficult to transfer to the shank part 12. Therefore, by this high frequency heating, only the collar part 13 is heated, and the shank part 12 is heated.
2 is not heated and its boundaries are very clear. As a result, only the collar portion 13 is subjected to the annealing treatment, and the collar portion 13 is softened by the annealing, resulting in a decrease in hardness and an improvement in toughness. On the other hand, the shank portion 12 maintains high hardness due to quenching treatment.
なお、この焼鈍処理に際し、ステム部にも非磁性筒体を
嵌合することができる。Note that during this annealing treatment, a non-magnetic cylinder can also be fitted to the stem portion.
次に、この発明方法により、インサートビ・ントを熱処
理した試験結果について説明する。供試材は５ＫＣ−１
１（Ｊ Ｉｓ）であり、先ず、この供試材を油中に焼入
れした。Next, test results obtained by heat treating insert inserts using the method of the present invention will be explained. The sample material is 5KC-1
1 (J Is), and first, this test material was quenched in oil.
次いで、この焼入れ材を４６０℃に２時間保持して焼戻
し処理し、ＨＰＯ３０の硬度を得た。その後、シャンク
部１２に銅製の筒体１４を嵌合すると共にカラー部１３
にコイル１５を配設し、コイル１５に、６ＫＨｚの高周
波電力（１５０Ｖ。Next, this hardened material was held at 460° C. for 2 hours and tempered to obtain a hardness of HPO30. After that, the copper cylinder 14 is fitted to the shank part 12, and the collar part 13 is fitted to the shank part 12.
A coil 15 is installed in the coil 15, and a 6KHz high frequency power (150V) is applied to the coil 15.
８５Ａ）を投入して素材を加熱した後放冷した。85A) was added to heat the material, and then allowed to cool.
この場合に、コイル１５と筒体１４との間の距離ｄ（第
１図参照）と、加熱時間とを種々変化させて、熱処理後
のインサートビットの硬度分布を測定した。第２図ｆａ
ｔ乃至ｆｃ）は測定した硬度分布を示す、第２図ｆａｔ
及び（ｂ）は、距離ｄが８．５１の場合、第２図［Ｃ１
は距１１１ｄが４．ｈ＋ｗの場合である。また、第２図
ｔａｒ、 （ｂｌ、 ｔｅｌは、加熱時間が夫々２５分
、３０分、２７分の場合であり、いずれもこのような焼
鈍処理を２回繰り返している。この図から明らかなよう
に、第２図ｔｅｌ及び（Ｃ）の場合には、シャンク部、
ステム部及びカラー部の付は根において十分高い硬度が
得られると共に、カラー部中央は十分に軟化している。In this case, the distance d between the coil 15 and the cylindrical body 14 (see FIG. 1) and the heating time were varied, and the hardness distribution of the insert bit after heat treatment was measured. Figure 2 fa
t to fc) shows the measured hardness distribution, Figure 2 fat
and (b), when the distance d is 8.51, Fig. 2 [C1
The distance 111d is 4. This is the case of h+w. In addition, in Fig. 2, tar, (bl, and tel) are heating times of 25 minutes, 30 minutes, and 27 minutes, respectively, and in each case, such annealing treatment was repeated twice.As is clear from this figure, In the case of FIG. 2 tel and (C), the shank part,
Sufficiently high hardness is obtained at the base of the stem and collar, and the center of the collar is sufficiently softened.
第２図（ｂｌの場合には、カラー部付は根の硬度が若干
不足しているが、シャンク部及びステム部は十分高い硬
度が得られ、カラー部は硬度が低い、このように、この
発明においては、確実に所望の硬度パターンを得ること
ができる。従って、インサートビットの寿命が長い。Figure 2 (In the case of BL, the hardness of the root of the collar part is slightly insufficient, but the shank part and stem part have sufficiently high hardness, and the hardness of the collar part is low. In the invention, a desired hardness pattern can be reliably obtained, and the life of the insert bit is therefore long.
（発明の効果）
この発明によれば、シャンク部に非磁性筒体を嵌合し、
カラー部の外周にコイルを配置して高周波加熱するから
カラー部のみ加熱されて焼鈍され、シャンク部は非磁性
筒体に磁場が吸収されて加熱されない。(Effect of the invention) According to the invention, the non-magnetic cylinder is fitted into the shank portion,
Since a coil is arranged around the outer periphery of the collar part and high-frequency heating is performed, only the collar part is heated and annealed, and the shank part is not heated because the magnetic field is absorbed by the non-magnetic cylinder.
従って、シャンク部は高硬度を維持すると共に、カラー
部は焼鈍による軟化を受けて硬度が低下し靭性が向上す
る。このため、この発明によれば所望の硬度パターンを
有するロッドを確実に且つ高効率で製造することができ
る。従って、ロッドの寿命を延長することができる。Therefore, the shank portion maintains high hardness, and the collar portion is softened by annealing, resulting in lower hardness and improved toughness. Therefore, according to the present invention, a rod having a desired hardness pattern can be manufactured reliably and with high efficiency. Therefore, the life of the rod can be extended.
第１図はこの発明の実施例を示し、シャンク部に筒体を
嵌合し、カラー部外周にコイルを配設したさく岩機用イ
ンサートビットの要部断面図、第２図ｔｅｌ乃至（Ｃ）
は本発明方法により熱処理されたインサートビットのカ
ラー部及びその近傍の硬度分布を示す゛模式図、第３図
はインサートビー／ ）の使用状況を示す模式図である
。
１１・・・ロッド素材、１２・・・シャンク部、１３・
・・カラー部、１４・・・筒体、１５・・・コイル。Fig. 1 shows an embodiment of the present invention, in which a cylindrical body is fitted into the shank part and a coil is arranged around the outer periphery of the collar part. )
3 is a schematic diagram showing the hardness distribution of the collar portion and its vicinity of the insert bit heat-treated by the method of the present invention, and FIG. 3 is a schematic diagram showing the usage status of the insert bit. 11...Rod material, 12...Shank part, 13.
... Collar part, 14 ... Cylindrical body, 15 ... Coil.
Claims (1)
た後、そのシャク部に非磁性の金属又は合金でつくられ
た筒体を嵌合し、そのカラー部の外周にコイルを配設し
、このコイルを介して素材を高周波誘導加熱して焼鈍処
理することを特徴とするさく岩機用ロッドの熱処理方法
。After the rock drill rod material is quenched to obtain the specified hardness, a cylinder made of non-magnetic metal or alloy is fitted to the shaft part, and a coil is placed around the outer circumference of the collar part. A method for heat treatment of a rod for a rock drill, characterized in that the material is annealed by high-frequency induction heating through the coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7016987A JPS63237877A (en) | 1987-03-26 | 1987-03-26 | Method of thermally treating rod for rock drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7016987A JPS63237877A (en) | 1987-03-26 | 1987-03-26 | Method of thermally treating rod for rock drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63237877A true JPS63237877A (en) | 1988-10-04 |
Family
ID=13423768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7016987A Pending JPS63237877A (en) | 1987-03-26 | 1987-03-26 | Method of thermally treating rod for rock drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63237877A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101638945B1 (en) * | 2015-07-17 | 2016-07-12 | 유장호 | Chisel for breaker, and manufacturing method thereof |
| US10605007B2 (en) | 2014-10-23 | 2020-03-31 | Ehwa Diamond Industrial Co., Ltd. | Drill bit for drilling and method for manufacturing same |
-
1987
- 1987-03-26 JP JP7016987A patent/JPS63237877A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10605007B2 (en) | 2014-10-23 | 2020-03-31 | Ehwa Diamond Industrial Co., Ltd. | Drill bit for drilling and method for manufacturing same |
| US10871038B2 (en) | 2014-10-23 | 2020-12-22 | Ehwa Diamond Industrial Co., Ltd. | Drill bit for drilling and method for manufacturing same |
| KR101638945B1 (en) * | 2015-07-17 | 2016-07-12 | 유장호 | Chisel for breaker, and manufacturing method thereof |
| WO2017014481A1 (en) * | 2015-07-17 | 2017-01-26 | 유장호 | Chisel for breaker and method for manufacturing same |
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