JPH03170616A - Laser beam optical instrument for heating inner face of pipe - Google Patents
Laser beam optical instrument for heating inner face of pipeInfo
- Publication number
- JPH03170616A JPH03170616A JP1309990A JP30999089A JPH03170616A JP H03170616 A JPH03170616 A JP H03170616A JP 1309990 A JP1309990 A JP 1309990A JP 30999089 A JP30999089 A JP 30999089A JP H03170616 A JPH03170616 A JP H03170616A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- conical
- laser beam
- inner face
- lens
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 title claims abstract description 16
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 abstract description 9
- 239000000835 fiber Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 239000010453 quartz Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、自動車の摺動部品のレーザ焼入れ等に利用さ
れるレーザ光学装置に関する。本発明はパイプ溶接部の
残留応力除去のための加熱やパイプ溶接部の脱鋭敏化熱
処理にも利用できる。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laser optical device used for laser hardening of sliding parts of automobiles. The present invention can also be used for heating to remove residual stress from pipe welds and for de-sensitization heat treatment of pipe welds.
【従来の技術］
第５図に従来手法によるパイプ内面加熱光学装置を示す
。これは、ＹＡＧレーザ光８によるパイプ内面加熱を目
的とするもので、光ファイバー６で伝送されたＹＡＧレ
ーザ光８は、プリズム１３によりパイプの周方向に拡が
り加熱するのに用いられる。[Prior Art] FIG. 5 shows an optical device for heating the inner surface of a pipe using a conventional method. The purpose of this is to heat the inner surface of the pipe with the YAG laser beam 8. The YAG laser beam 8 transmitted through the optical fiber 6 is used to spread in the circumferential direction of the pipe by the prism 13 and heat it.
［発明が鯉決しようとする課題］
従来の加熱光学系では、先ファイバー６から出射された
ＹＡＧレーザ光８は第５図に示すようにそのビーム強度
分布２３は中央が強い。従って、パイプ内面周方向に拡
がったレーザ光も部分的に強度の高いビーム強度分市２
４となることから、エネルギ密度の高い部分でパイプ内
面が局部的に溶融したりして、均一な加熱が困難であっ
た。[Problems to be solved by the invention] In the conventional heating optical system, the beam intensity distribution 23 of the YAG laser beam 8 emitted from the tip fiber 6 is strong at the center, as shown in FIG. Therefore, the laser beam that spreads in the circumferential direction of the inner surface of the pipe also has a partially high beam intensity.
4, the inner surface of the pipe was locally melted in areas with high energy density, making uniform heating difficult.
また、プリズム１３によりＹＡＧレーザ光８を反射させ
．る方向では、パイプ長手方向の幅の広い加熱は困難で
あった。Further, the YAG laser beam 8 is reflected by the prism 13. In this case, it was difficult to heat a wide pipe in the longitudinal direction.
さらに、従来の光学系は、石英ガラスバイプ１２．円錐
状プリズム１３，石英ガラスパイプ１４．１５等石英ガ
ラスにより製作されているが、これは実用上は、破損し
易いという欠点があった。Furthermore, the conventional optical system uses a quartz glass vip 12. Although the conical prism 13, quartz glass pipes 14, 15, etc. are made of quartz glass, they have the drawback of being easily damaged in practical use.
本発明はこれらの問題を解決したパイプ内面加熱用レー
ザ光学装置を提供することを目的とする。An object of the present invention is to provide a laser optical device for heating the inner surface of a pipe that solves these problems.
［３題を解火するための千段］
本発明に係るパイプ内面加熱用レーザ光学装置は、
（１） 光ファイバーから出ａＪされるレーザ光を平
行光線にするコリメートレンズ５と、平行にされたレー
ザ光を均一にする円錐状レンズ４とビーム照躬方向をパ
イプ内面方向にかえる円錐状ミラー１からなることを特
徴，とする。[A Thousand Steps to Solving Three Problems] The laser optical device for heating the inner surface of a pipe according to the present invention includes: (1) a collimating lens 5 that converts the laser beam emitted from the optical fiber into parallel light; It is characterized by comprising a conical lens 4 that makes the laser beam uniform and a conical mirror 1 that changes the direction of beam illumination toward the inner surface of the pipe.
（２）前記手段において、円錐状ミラー１の代りに多段
円錐状ミラー１０を用いることを特徴とする。(2) In the above means, a multi-stage conical mirror 10 is used instead of the conical mirror 1.
［作用］
ファイバから出射されたＹＡＧレーザ光８あるいは拡が
りを持つＹＡＧレーザ光８は、第１図のコリーメントレ
ンズ５により、平行に近い光線に変換される。そして、
円錐状レンズ４に入射する以前において中央にビーム強
度のビーク１９があるＹＡＧレーザ光８は円錐状レンズ
４により、均一化されてビーム強度分布２０のごとくな
り、円錐状ミラー１によりパイプ内面の加熱領域に結像
するように導びかれる。[Operation] The YAG laser beam 8 emitted from the fiber or the YAG laser beam 8 having a spread is converted into a nearly parallel beam by the collimation lens 5 shown in FIG. and,
Before entering the conical lens 4, the YAG laser beam 8, which has a beam intensity peak 19 at the center, is made uniform by the conical lens 4 and has a beam intensity distribution 20, and the conical mirror 1 heats the inner surface of the pipe. guided to image the area.
また、円錐状ミラー１を、第３図のように多段円錐状金
属ミラー１０とすることにより、反射光を２分し、均一
な２分割されたビーム強度分布２１として、パイプ内面
に照射される事により通常の目錐状ミラー１に比べ、パ
イプ長手方向に広い範囲の加熱が可能となる。In addition, by using a multistage conical metal mirror 10 as the conical mirror 1 as shown in FIG. 3, the reflected light is divided into two parts, and the inner surface of the pipe is irradiated as a uniform two-divided beam intensity distribution 21. This makes it possible to heat a wider range in the longitudinal direction of the pipe than with a normal conical mirror 1.
［実施例］ 本発明の尖施例を第１図〜第４図に示す。[Example] A pointed embodiment of the present invention is shown in FIGS. 1-4.
第１図は本発明の丈施に供した光学装置を示す。FIG. 1 shows an optical device used for implementing the present invention.
本光学装置のＹＡＧレーザによりパイプ内面加熱を実施
した。レーザ出力５００Ｗのレーザ光をファイバ出射後
２枚の平凸レンズ５によりコリメートした後円錐状レン
ズ４により集光し、多段円錐状金属ミラー１でパイプ内
面を加熱した。加熱に供したバイプ１７は、内径１０ｍ
＋１’、肉厚２ｍｌＩのステンレス製パイプである。The inner surface of the pipe was heated using the YAG laser of this optical device. A laser beam with a laser output of 500 W was emitted from a fiber, collimated by two plano-convex lenses 5, and then condensed by a conical lens 4, and the inner surface of the pipe was heated by a multistage conical metal mirror 1. The vip 17 used for heating has an inner diameter of 10 m.
+1', a stainless steel pipe with a wall thickness of 2mlI.
一方、この光学装置の外径は９ｍｌ１−で、金属は熱膨
張の少ないＳＵＳ４０５で製作した。また、光学装置の
金屈内面は、すべてＡｕコーティングされ、ＹＡＧレー
ザ光８の反射光により光学系が損傷を受けないよう考慮
している。第１図中３はレンズホルダー ７はファイバ
ホルダー ９は冷却用ガス入口を示す。On the other hand, the outer diameter of this optical device was 9 ml1-, and the metal was made of SUS405 with low thermal expansion. In addition, all the gold-bent inner surfaces of the optical device are coated with Au to prevent the optical system from being damaged by the reflected light of the YAG laser beam 8. In FIG. 1, 3 indicates a lens holder, 7 indicates a fiber holder, and 9 indicates a cooling gas inlet.
第４図に第１図に示した加熱光学装置によりバイプ１７
の内面を加熱した際のパイプ内面の熱雷対による温度測
定結果を示す。１８は計δＩＩ１位置を示す。測定は、
レーザ出力５００Ｗで、ビームを３秒照射した際の最高
到達温度を計った。FIG. 4 shows the heating optical device shown in FIG.
Shows the results of temperature measurement using a thermal lightning pair on the inner surface of the pipe when the inner surface of the pipe was heated. 18 indicates a total of δII1 positions. The measurement is
The maximum temperature reached when the beam was irradiated for 3 seconds with a laser output of 500 W was measured.
第４図（Ａ）には、パイプ内面の長芋方向の温度分布を
示す。これからわかるように多段円錐ミラー１を用いる
り■こより、長手方向に対し、４〜５ｍ■の長い均一加
熱幅が得られた。その際の温度は７５０℃〜８５０℃の
間に押えられる。FIG. 4(A) shows the temperature distribution in the direction of the yam inside the pipe. As can be seen, by using the multistage conical mirror 1, a long uniform heating width of 4 to 5 m in the longitudinal direction was obtained. The temperature at that time is kept between 750°C and 850°C.
第４図（Ｂ）には、パイプ周方向の温度分６ｉを示した
。第４図（Ｂ）から円周上で均一な温度分布が得られて
いる事がわかる。その際の温度は７５０℃〜８００℃の
間に押えられる。FIG. 4(B) shows the temperature 6i in the circumferential direction of the pipe. It can be seen from FIG. 4(B) that a uniform temperature distribution is obtained on the circumference. The temperature at that time is kept between 750°C and 800°C.
以上により、パイプの全周の長手方向４〜５恥の広い範
囲を均一に加熱し得る事がわかった。As a result of the above, it was found that it was possible to uniformly heat a wide range of 4 to 5 mm in the longitudinal direction around the entire circumference of the pipe.
また、第１図で、ＹＡＧレーザ光透過窓２，田錐状レン
ズ４，コリメートレンズ５，光ファイバ６等以外はすべ
て金属により構戊する。そのため破損しずらく、実用に
供し易い。Moreover, in FIG. 1, everything except the YAG laser light transmission window 2, the conical lens 4, the collimating lens 5, the optical fiber 6, etc. is made of metal. Therefore, it is hard to be damaged and is easy to put into practical use.
［発明の効果］
本発明は前述のように構威されているので、本発明装置
によりパイプの全周の長手方向４〜５ＩＩＩ１の広い範
囲を均一に加熱することができる。[Effects of the Invention] Since the present invention is configured as described above, a wide range in the longitudinal direction 4 to 5III1 around the entire circumference of the pipe can be uniformly heated by the apparatus of the present invention.
第１図は本発明装置の実施例の組立図、第２図は、本発
明装置の実施例の円錐状ミラーによるビームの状態を示
す図、第３図は本発明装置の丈施例の多段円錐状ミラー
による加熱の状態を示す図、第４図は本発明装置の丈施
例による加熱時の温度分布を示す図、第５図は従来装置
の断面図である。
１・・・円錐状金属ミラー ２・・・ＹＡＧレーザ光透
過窓、３・・・レンズホルダー ４・・・石英製ｒ＋’
ｉ錐状レンズ、５・・・石英製コリメートレンズ、６・
・・光ファイバ、７・・・金属製ファイバホルダー ８
・・１ＹＡＧレーザ光、９・・・冷却用ガス人口、１０
・・・多段円錐状金属ミラー １１・・・テフロン製ス
トッパー１２・・・石英ガラスパイプ、１３・・・石英
製囚錐状プリズム、１４．１５・・・石英ガラスパイプ
、１６・・・金属製ガイドチューブ、１７・・・パイプ
、１８・・・計ａＪ位置、１９，２０．２１・・・ビー
ム強度分布、２２・・・バイプ西而の温度分布、２３．
２４・・・ビーム強度分布。Fig. 1 is an assembly diagram of an embodiment of the device of the present invention, Fig. 2 is a diagram showing the state of the beam by the conical mirror of the embodiment of the device of the present invention, and Fig. 3 is a multistage embodiment of the device of the present invention. FIG. 4 is a diagram showing the state of heating by the conical mirror, FIG. 4 is a diagram showing the temperature distribution during heating by a height embodiment of the device of the present invention, and FIG. 5 is a sectional view of the conventional device. 1... Conical metal mirror 2... YAG laser beam transmission window, 3... Lens holder 4... Quartz r+'
i-conical lens, 5... quartz collimating lens, 6...
...Optical fiber, 7...Metal fiber holder 8
...1YAG laser beam, 9...Cooling gas population, 10
... Multistage conical metal mirror 11 ... Teflon stopper 12 ... Quartz glass pipe, 13 ... Quartz conical prism, 14.15 ... Quartz glass pipe, 16 ... Metal Guide tube, 17... Pipe, 18... Total aJ position, 19, 20. 21... Beam intensity distribution, 22... Temperature distribution around the pipe, 23.
24...Beam intensity distribution.
Claims (2)
にするコリメートレンズ（５）と、平行にされたレーザ
光を均一にする円錐状レンズ（４）とビーム照射方向を
パイプ内面方向にかえる円錐状ミラー（１）からなるこ
とを特徴とするパイプ内面加熱用レーザ光学装置。(1) A collimating lens (5) that converts the laser beam emitted from the optical fiber into a parallel beam, a conical lens (4) that makes the parallel laser beam uniform, and a conical lens that changes the beam irradiation direction toward the inner surface of the pipe. A laser optical device for heating the inner surface of a pipe, characterized by comprising a mirror (1).
１０）を用いることを特徴とする請求項（１）のパイプ
内面加熱用レーザ光学装置。(2) Multi-stage conical mirror (
10) The laser optical device for heating the inner surface of a pipe according to claim (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1309990A JPH03170616A (en) | 1989-11-29 | 1989-11-29 | Laser beam optical instrument for heating inner face of pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1309990A JPH03170616A (en) | 1989-11-29 | 1989-11-29 | Laser beam optical instrument for heating inner face of pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03170616A true JPH03170616A (en) | 1991-07-24 |
Family
ID=17999811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1309990A Pending JPH03170616A (en) | 1989-11-29 | 1989-11-29 | Laser beam optical instrument for heating inner face of pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03170616A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7285744B2 (en) * | 2003-08-21 | 2007-10-23 | Leister Process Technologies | Method and apparatus for simultaneously heating materials |
| US20160151862A1 (en) * | 2012-02-10 | 2016-06-02 | Limo Patentverwaltung Gmbh & Co. Kg | Device for laser processing of a surface of a workpiece or for post-treatment of a coating on the outside or the inside of a workpiece |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6224883A (en) * | 1985-07-25 | 1987-02-02 | Toyota Motor Corp | Laser beam surface treatment of circumferential part |
| JPS62109924A (en) * | 1985-11-08 | 1987-05-21 | Komatsu Ltd | Laser hardening method |
| JPS6368288A (en) * | 1986-09-09 | 1988-03-28 | Hitachi Ltd | Linear beam taking off device |
| JPS63108318A (en) * | 1986-10-27 | 1988-05-13 | Nikon Corp | Laser working device |
| JPS63262414A (en) * | 1987-04-20 | 1988-10-28 | Nippon Steel Corp | Method and apparatus for heat-treating work |
-
1989
- 1989-11-29 JP JP1309990A patent/JPH03170616A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6224883A (en) * | 1985-07-25 | 1987-02-02 | Toyota Motor Corp | Laser beam surface treatment of circumferential part |
| JPS62109924A (en) * | 1985-11-08 | 1987-05-21 | Komatsu Ltd | Laser hardening method |
| JPS6368288A (en) * | 1986-09-09 | 1988-03-28 | Hitachi Ltd | Linear beam taking off device |
| JPS63108318A (en) * | 1986-10-27 | 1988-05-13 | Nikon Corp | Laser working device |
| JPS63262414A (en) * | 1987-04-20 | 1988-10-28 | Nippon Steel Corp | Method and apparatus for heat-treating work |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7285744B2 (en) * | 2003-08-21 | 2007-10-23 | Leister Process Technologies | Method and apparatus for simultaneously heating materials |
| US20160151862A1 (en) * | 2012-02-10 | 2016-06-02 | Limo Patentverwaltung Gmbh & Co. Kg | Device for laser processing of a surface of a workpiece or for post-treatment of a coating on the outside or the inside of a workpiece |
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