JPS6323553Y2 - - Google Patents
Info
- Publication number
- JPS6323553Y2 JPS6323553Y2 JP1981164800U JP16480081U JPS6323553Y2 JP S6323553 Y2 JPS6323553 Y2 JP S6323553Y2 JP 1981164800 U JP1981164800 U JP 1981164800U JP 16480081 U JP16480081 U JP 16480081U JP S6323553 Y2 JPS6323553 Y2 JP S6323553Y2
- Authority
- JP
- Japan
- Prior art keywords
- chilled
- chill
- cylinder liner
- cavitation
- laser beam
- 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
- 229910001018 Cast iron Inorganic materials 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Description
【考案の詳細な説明】
デイーゼルエンジンのシリンダライナに於い
て、エンジンの圧縮ガスの爆発によつてシリンダ
ライナに振動を生じ、その振動によつて生ずるキ
ヤビテーシヨンのために、冷却水と接するジヤケ
ツト部に孔蝕が発生し、シリンダライナ壁を貫通
し、遂には水洩れ事故につながるエンジントラブ
ルの発生することは公知の事実である。近時、エ
ンジンの高出力化、高速化に伴い、シリンダライ
ナの振動は苛酷になる傾向にあるので、キヤビテ
ーシヨンによるシリンダライナの損傷孔蝕は増大
され、エンジン寿命を左右する大なる問題になつ
ており、この対策が課題になつているのが現状で
ある。[Detailed description of the invention] In the cylinder liner of a diesel engine, the explosion of the engine's compressed gas causes vibration in the cylinder liner, and due to the cavitation caused by the vibration, the jacket part that comes in contact with the cooling water It is a well-known fact that pitting occurs, penetrates the cylinder liner wall, and eventually causes engine troubles that lead to water leakage accidents. In recent years, as engines have become more powerful and faster, cylinder liner vibrations have become more severe, causing damage and pitting of the cylinder liner due to cavitation, which has become a major problem that affects engine life. Currently, countermeasures against this problem are becoming an issue.
従来、デイーゼルエンジン用シリンダライナの
外周面のキヤビテーシヨン防止対策としては、例
えばCrめつき被膜で保護する手法、あるいは
Al2O3の如きセラミツク系の溶射被膜で保護する
手法が採用されているが、Crめつきの場合には、
公害防止等の点から設備的制約もあり、コスト高
であり、溶射被膜の場合は耐久性に難点があるた
め、これらにかわる防止対策が望まれている。 Conventionally, measures to prevent cavitation on the outer peripheral surface of diesel engine cylinder liners include, for example, protecting the outer peripheral surface with a Cr plating film;
A method of protecting with a sprayed ceramic coating such as Al 2 O 3 has been adopted, but in the case of Cr plating,
There are equipment restrictions from the viewpoint of pollution prevention, etc., the cost is high, and thermal spray coatings have shortcomings in durability, so alternative preventive measures are desired.
本考案は、鋳鉄製シリンダライナの外周面をレ
ーザビームで溶融しチル化せしめ、キヤビテーシ
ヨン孔蝕を防止しようとするものである。 The present invention aims to prevent cavitation corrosion by melting and chilling the outer peripheral surface of a cast iron cylinder liner using a laser beam.
キヤビテーシヨン孔蝕に対して、片状黒鉛を析
出させた鋳鉄よりもチル化した鋳鉄がその抵抗性
に優れていることは公知の事実であるが、例えば
冷し金等を使用してシリンダライナの外周面にチ
ルを形成させた場合には、冷し金の影響がピスト
ンリングが摺動するシリンダライナの内周面にま
で及び、耐摩耗性、及び耐焼付性に重要な影響を
持つ黒鉛形状を悪化させ、好ましくない。又、シ
リンダライナはシリンダブロツクに挿入使用され
るため、寸法精度が重要で、そのためには高精度
の機械加工が必要であるが、冷し金等でチル化し
た場合には、加工性が劣化する問題が生ずる。そ
して冷し金等でチル化した組織はそれ程緻密でな
くキヤビテーシヨンに対する抵抗性も弱い。 It is a well-known fact that chilled cast iron has better resistance to cavitation pitting than cast iron on which flaky graphite has been precipitated. When a chill is formed on the outer circumferential surface, the influence of the chill extends to the inner circumferential surface of the cylinder liner on which the piston ring slides, resulting in a graphite shape that has an important effect on wear resistance and seizure resistance. This is not desirable because it worsens the situation. In addition, since the cylinder liner is inserted into the cylinder block, dimensional accuracy is important, and high-precision machining is required for this purpose, but if it is chilled with a chiller, etc., the workability will deteriorate. A problem arises. Furthermore, the structure chilled with a chilled metal is not so dense and has low resistance to cavitation.
かかる問題点を解決するには、レーザビームに
よつて鋳鉄表面を溶融チル化することは極めて効
果的である。得られるチル組織も冷却が早いため
極めて緻密で硬さはHv800〜900に達する。又、
チル深さ及び巾等のコントロールが容易であり、
シリンダライナ内周面の黒鉛組織に影響を及ぼさ
ない利点がある。なお、レーザビームによる処理
は電子ビーム処理に較べ大気中での処理が可能で
あり、加工物の大きさによる制約を受けない点で
より工業的、経済的である。 To solve these problems, it is extremely effective to melt and chill the surface of cast iron using a laser beam. The resulting chilled structure also cools quickly, so it is extremely dense and has a hardness of 800 to 900 Hv. or,
It is easy to control chill depth and width, etc.
This has the advantage of not affecting the graphite structure on the inner peripheral surface of the cylinder liner. Note that laser beam processing is more industrial and economical than electron beam processing because it can be performed in the atmosphere and is not limited by the size of the workpiece.
冷し金を使用した場合には、チル組織に黒鉛の
残留が認められることがあり、耐キヤビテーシヨ
ン性では、この黒鉛は、好ましくない。 When a chilled metal is used, residual graphite may be observed in the chilled structure, and this graphite is not preferred in terms of cavitation resistance.
第１図にレーザビームによつて鋳鉄製シリンダ
ライナの外周面を溶融チル化させた時の顕微鏡組
織を示す。Ａ部分が溶融チル化されたチル組織
で、Ｂ部分は焼入された組織を示す。 Figure 1 shows the microscopic structure of the outer peripheral surface of a cast iron cylinder liner when it is melted and chilled using a laser beam. Part A is a chilled structure that has been melted and chilled, and part B is a quenched structure.
以下、実施例に基づいて本考案の効果を説明す
る。 Hereinafter, the effects of the present invention will be explained based on Examples.
T.C3.10％、Si1.97％、Mn0.71％、P0.26％、
Cr0.30％、残Feのシリンダライナ用の鋳鉄溶湯
にてキヤビテーシヨンテスト用の試験片を作成し
た。試験片１の形状は第２〜３図に示す。かかる
試験片をCO2ガスレーザにて出力1.0KW、照射速
度1000mm／min、照射巾（Ｗ）2.5mm、照射間隔
（Ｐ）1.6mm及び2.0mmにて帯状に未処理部がない
ようにビームを重ねて表面を溶融チル化せしめた
（第４〜５図参照）。
T.C3.10%, Si1.97%, Mn0.71%, P0.26%,
A test piece for cavitation test was prepared using molten cast iron for cylinder liners with 0.30% Cr and residual Fe. The shape of the test piece 1 is shown in FIGS. 2 and 3. The test piece was irradiated with a CO 2 gas laser beam at an output of 1.0 KW , an irradiation speed of 1000 mm/min, an irradiation width (W) of 2.5 mm, and an irradiation interval (P) of 1.6 mm and 2.0 mm so that there were no untreated areas. The surfaces were stacked and melted and chilled (see Figures 4 and 5).
得られた試験片の中の照射間隔1.6mmのものの
チル部の硬さは、Hv871であり、チル深さは0.20
〜0.35mmで、照射間隔2.0mmのもののチル部硬さ
はHv850であり、チル深さは0.10〜0.25mmであつ
た。他方、冷し金により試験片表面をチル化せし
めた。得られた試験片のチル部の硬さはHv760で
あり、チル深さは３〜４mmであつた。かかる試験
片を第６図に示した磁歪振動式のキヤビテーシヨ
ン試験機を使用して、キヤビテーシヨン損傷量を
調べた。１がキヤビテーシヨン試験片、２は媒体
液、３は超音波振動振巾拡大ホーン、４は磁歪振
動子、５は超音波発振器で、試験条件は以下のと
おりである。 The hardness of the chilled part of the test piece obtained with an irradiation interval of 1.6 mm was Hv871, and the chill depth was 0.20.
~0.35mm, the chill part hardness of the irradiation interval of 2.0mm was Hv850, and the chill depth was 0.10~0.25mm. On the other hand, the surface of the test piece was chilled using a chilled metal. The hardness of the chilled portion of the obtained test piece was Hv760, and the chill depth was 3 to 4 mm. The amount of cavitation damage on this test piece was examined using a magnetostrictive vibration type cavitation testing machine shown in FIG. 1 is a cavitation test piece, 2 is a medium liquid, 3 is an ultrasonic vibration amplitude expansion horn, 4 is a magnetostrictive vibrator, and 5 is an ultrasonic oscillator, and the test conditions are as follows.
振動数 ：6700Hz
振 幅 ：90μm
媒体液 ：脱気蒸留水
液 温 ：（80±２）℃
加振時間 ：２時間
試験結果は第７図に示したとおりであり、レー
ザービームによつて表面を溶融チル化せしめた本
考案はキヤビテーシヨン孔蝕に対し極めて有効で
あることが判明する。 Vibration frequency: 6700Hz Amplitude: 90μm Medium liquid: Degassed distilled water Liquid temperature: (80±2)℃ Excitation time: 2 hours The test results are as shown in Figure 7. It has been found that the present invention, which is melt-chilled, is extremely effective against cavitation pitting.
尚、かかる手法をシリンダライナに適用する場
合、前述の如くキヤビテーシヨン孔蝕の原因は、
エンジンの圧縮ガスの爆発によつて生起されるシ
リンダライナの振動に基因するため、通常はクラ
ンク軸に直角なシリンダライナのスライス及びア
ンチスラスト側のジヤケツト部に孔蝕は発生す
る。経済的な見地より、シリンダライナのジヤケ
ツト部全周にわたつてレーザビームにより溶融チ
ル化する必要はなく、孔蝕の発生するスラスト及
びアンチスラスト部のみに限定して、部分処理す
ることも可能である。 In addition, when applying this method to cylinder liners, the causes of cavitation pitting are as described above.
Due to vibrations in the cylinder liner caused by the explosion of compressed gas in the engine, pitting usually occurs in the cylinder liner slice perpendicular to the crankshaft and in the anti-thrust side jacket. From an economical point of view, it is not necessary to melt and chill the entire circumference of the jacket part of the cylinder liner using a laser beam, and it is also possible to perform partial treatment only on the thrust and anti-thrust parts where pitting occurs. be.
又、レーザビームは、第４〜５図に示すように
帯状に重ねて照射し、その照射巾は１〜４mmが望
ましい。１mm未満ではチル部分が空孔等を含んで
均一なチル組織が得られず、４mm超えるとエネル
ギ密度が低下してチルが入りにくくなり、チリ深
さを確保するには照射時間が長くなり非能率であ
る。照射間隔は未処理部が発生しない範囲で0.5
〜４mmが望ましい。チル深さは0.05〜0.40mmが望
ましく、0.05mm未満ではチル組織に黒鉛が残留す
る可能性があり、キヤビテーシヨンに対する抵抗
性が弱く、0.40mm超えると処理時間が長くなり非
能率であり、又熱量が大きいためクラツクが発生
するおそれがある。 Further, the laser beam is irradiated in a band-like manner as shown in FIGS. 4 and 5, and the irradiation width is preferably 1 to 4 mm. If it is less than 1mm, the chilled part will contain pores and a uniform chilled structure cannot be obtained, and if it exceeds 4mm, the energy density will decrease and it will be difficult to get chills, and the irradiation time will be longer to ensure the depth of the chill, making it difficult to obtain a uniform chilled structure. It's efficiency. The irradiation interval is 0.5 as long as no untreated areas occur.
~4 mm is desirable. The desired chill depth is 0.05 to 0.40 mm; if it is less than 0.05 mm, graphite may remain in the chilled structure and the resistance to cavitation will be weak; if it exceeds 0.40 mm, the processing time will be longer, resulting in inefficiency, and the amount of heat will be reduced. There is a risk of cracks occurring because of the large amount of noise.
第１図はレーザビームによつて鋳鉄製シリンダ
ライナの外周面を溶融チル化させた時の顕微鏡組
織写真であり、第２図と第３図は試験片の平面図
と正面図、第４図と第５図は表面をチル化した試
験片の一部分を示す平面図と断面図、第６図は磁
歪振動式のキヤビテーシヨン試験機の概要図、第
７図はキヤビテーシヨン試験結果を示す。
Figure 1 is a photograph of the microscopic structure when the outer circumferential surface of a cast iron cylinder liner is melted and chilled by a laser beam, Figures 2 and 3 are a plan view and front view of the test piece, and Figure 4 5 is a plan view and a sectional view showing a portion of a test piece with a chilled surface, FIG. 6 is a schematic diagram of a magnetostrictive vibration type cavitation testing machine, and FIG. 7 shows the cavitation test results.
Claims (1)
外周面の冷却水と接するジヤケツト部がレーザビ
ームにより高緻密化したチル組織に形成されると
ともに、該チル組織の層を形成するレーザビーム
の照射間隔が未処理部の発生しない範囲で0.5〜
４mm、照射幅1.0〜4.0mm、チル深さ0.05〜0.40mm
とし、且つチル硬さをHv800〜900とした帯状チ
ル組織層を有するシリンダライナ。 The jacket part of the outer peripheral surface of a cast iron cylinder liner for diesel engines that comes in contact with the cooling water is formed into a highly dense chilled structure by the laser beam, and the irradiation interval of the laser beam that forms the layer of the chilled structure is set to the untreated part. 0.5~ within the range that does not occur
4mm, irradiation width 1.0~4.0mm, chill depth 0.05~0.40mm
A cylinder liner having a band-shaped chill structure layer with a chill hardness of Hv800 to 900.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16480081U JPS5870437U (en) | 1981-11-06 | 1981-11-06 | Cylinder liner with cavitation-resistant chill structure formed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16480081U JPS5870437U (en) | 1981-11-06 | 1981-11-06 | Cylinder liner with cavitation-resistant chill structure formed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5870437U JPS5870437U (en) | 1983-05-13 |
| JPS6323553Y2 true JPS6323553Y2 (en) | 1988-06-28 |
Family
ID=29957024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16480081U Granted JPS5870437U (en) | 1981-11-06 | 1981-11-06 | Cylinder liner with cavitation-resistant chill structure formed |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5870437U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5453628A (en) * | 1977-10-06 | 1979-04-27 | Toshiba Corp | Engine member |
| JPS55164745A (en) * | 1979-05-22 | 1980-12-22 | Nippon Piston Ring Co Ltd | Cylinder and cylinder liner |
-
1981
- 1981-11-06 JP JP16480081U patent/JPS5870437U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5453628A (en) * | 1977-10-06 | 1979-04-27 | Toshiba Corp | Engine member |
| JPS55164745A (en) * | 1979-05-22 | 1980-12-22 | Nippon Piston Ring Co Ltd | Cylinder and cylinder liner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5870437U (en) | 1983-05-13 |
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