JP3916058B2 - Cylinder liner manufacturing method - Google Patents
Cylinder liner manufacturing method Download PDFInfo
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- JP3916058B2 JP3916058B2 JP2002158398A JP2002158398A JP3916058B2 JP 3916058 B2 JP3916058 B2 JP 3916058B2 JP 2002158398 A JP2002158398 A JP 2002158398A JP 2002158398 A JP2002158398 A JP 2002158398A JP 3916058 B2 JP3916058 B2 JP 3916058B2
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- cylinder liner
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Description
【０００１】
【発明の属する技術分野】
本発明は、内燃機関用シリンダライナの製造方法に関するものであり、さらに詳しく述べると、シリンダライナ素材から少なくとも内周面の一部に水蒸気処理による酸化鉄皮膜を有するシリンダライナ完成品に仕上げる製造工程に係るものである。
【０００２】
【従来の技術】
鋳鉄製又は鋼製の内燃機関用シリンダライナの製造工程において内周面に水蒸気処理を施して酸化鉄皮膜を形成することは、国際公開公報ＷＯ０１／３３０６５Ａ１により公知である。
【０００３】
内周面に水蒸気処理酸化鉄皮膜を有するシリンダライナは、鋳造したシリンダライナ素材に切削加工及び研削加工並びに水蒸気処理を施して製造する。その従来の製造工程は、全長鍔径切削→内面荒切削→外面荒切削→内面中仕上切削→ファインボーリング（切削）→外面仕上切削→ホーニング→水蒸気処理→外径研削→ポリシング、であり、必要に応じて、外面荒切削後、残留応力を除去するために、焼きなまし処理が実施される。ポリシング後のシリンダライナ完成品にグレード検査を実施して製品をランク分けする。
【０００４】
【発明が解決しようとする課題】
製造工程中の切削、研削は機械加工であり、加工後のシリンダライナ中間工程品に加工応力が生じて残留する。その残留応力は加工代が大きい程大きい。水蒸気処理と焼きなまし処理は加熱と徐冷の熱処理であり、処理後のシリンダライナ中間工程品の残留応力を解放して除去するが、そのため、シリンダライナ中間工程品に変形が生ずる。その変形量は除去した残留応力が大きい程大きい。
【０００５】
従来の工程においては、焼きなまし処理を実施しても、水蒸気処理によるシリンダライナ中間工程品の変形量が比較的大きく、真円度が低下して外径研削時に目残りとなる不良品が発生することもあった。このため、シリンダライナ完成品のグレード検査に過大な工数を要するという問題があった。
【０００６】
本発明はこの問題を解決するためになされたものであり、その課題は、シリンダライナ中間工程品の水蒸気処理による変形量を抑制してより精度を向上することにある。
【０００７】
【課題を解決するための手段】
本願の発明者は、従来の工程が、焼きなまし処理の実施には関係なく、シリンダライナ中間工程品の水蒸気処理による変形量が比較的大きい理由は、焼きなまし処理後から水蒸気処理までの間にシリンダライナ中間工程品に生じた残留応力が比較的大きいことによると考え、焼きなまし処理後から水蒸気処理までの工程を組み替えて残留応力を減少するテストを繰り返した結果、本発明に到達した。
【０００８】
前記課題を達成するため、本発明が採用する手段は、焼きなまし処理前に加工代が多くて加工応力の大きい全長鍔径切削、内面荒切削、外面荒切削、内面中仕上切削、ファインボーリング、外面仕上切削を実施し、焼きなまし処理後から水蒸気処理までの間は、加工代が少なくて加工応力の小さいホーニング、外径研削のみを実施し、水蒸気処理後は加工代が極めて少ない外径研削、ポリシングのみを実施する製造工程にある。
【０００９】
焼きなまし処理前に実施した加工によってシリンダライナ中間工程品に生じた比較的大きな残留応力は、焼きなまし処理により除去し、それによって生じた比較的大きな変形は、次のホーニング及び外径研削により修正して、真円度の低下を防止する。このホーニング及び外径研削によりシリンダライナ中間工程品に生じる残留応力は小さいから、その後の水蒸気処理による変形量は極めて小さく、シリンダライナ中間工程品は良好な真円度を保持する。したがって、本発明の製造工程はシリンダライナ素材を精度の良好なシリンダライナ完成品に仕上げることができる。
【００１０】
【発明の実施の形態】
本発明のシリンダライナ製造方法を第１実施例と従来例に基づいて説明する。第１実施例と従来例の製造工程は工程表に、外面仕上切削後から水蒸気処理後までの各工程後のシリンダライナ中間工程品及びポリシング後の完成品の真円度の指数は真円度指数表にそれぞれ示している。指数は、従来例の水蒸気処理後のシリンダライナ中間工程品の真円度を１００とした数値である。又、図１には、第１実施例と従来例のシリンダライナの水蒸気処理後の中間工程品とポリシング後の完成品の真円度指数をグラフで示している。
【００１１】
工程表
工程 第１実施例 従来例
第１工程 全長鍔径切削 全長鍔径切削
第２工程 内面荒切削 内面荒切削
第３工程 外面荒切削 外面荒切削
第４工程 内面中仕上切削 内面中仕上切削
第５工程 ファインボーリング ファインボーリング
第６工程 外面仕上切削 外面仕上切削
第７工程 焼きなまし処理 ホーニング
第８工程 ホーニング 水蒸気処理
第９工程 外径研削 外径研削
第１０工程 ホーニング ポリシング
第１１工程 水蒸気処理
第１２工程 外径研削
第１３工程 ポリシング
【００１２】
焼きなまし処理をしない従来例は１０工程であるが、第１実施例は１３工程であり、３工程増加する。増加した工程は、焼きなまし処理、ホーニング、外径研削である。
【００１３】
【表１】
真円度指数表
第１実施例も、従来例も、第１工程から第６工程までは、加工代が多い加工であるから、加工による残留応力は大きい。第１実施例は、第７工程に焼きなまし処理が入るため、第１工程から第６工程までの残留応力と加工前の鋳造応力は解放されるが、応力解放によりシリンダライナ中間工程品は変形する。このため、シリンダライナ中間工程品の焼きなまし処理前の真円度指数８１．４は焼きなまし処理後に１４７．３と悪化する。しかし、第８工程のホーニング、第９工程の外径研削、第１０工程のホーニングが真円度を改善するから、シリンダライナ中間工程品の真円度指数は２７．７まで向上する。この第８工程から第１０工程までは、加工代の少ない加工であり、加工による残留応力はわずかであるから、次の第１１工程の水蒸気処理において、残留応力を解放してもシリンダライナ中間工程品に変形は殆ど発生しない。このため、水蒸気処理後のシリンダライナ中間工程品の真円度指数は２６．５となり、水蒸気処理前と略同じである。第１２工程で外径研削を行い、第１３工程でポリシングにより内周の粗さを整えたシリンダライナ完成品の真円度指数は２６．５である。完成品の検査結果は合格（○）である。
【００１５】
これに対し、従来例は第８工程の水蒸気処理により大きな残留応力を解放するから、水蒸気処理後のシリンダライナ中間工程品の変形量は大きく、真円度指数は第７工程のホーニング後の２１．８から一挙に１００へと悪化する。この真円度の低下は第９工程の外径研削と第１０工程のポリシングで補正しきれないから、シリンダライナ完成品の真円度指数は８７．３に留まる。完成品の検査結果は不合格（×）である。
【００１６】
【実施例】
次に、本発明の第２ないし第９実施例について説明する。前記真円度指数表に、第２ないし第９実施例の外面仕上切削後から水蒸気処理後までの各工程後のシリンダライナ中間工程品及びポリシング後の完成品の真円度指数を示している。又、図１には、第１、第２、第４、第６、第８実施例のシリンダライナの水蒸気処理後の中間工程品とポリシング後の完成品の真円度指数をグラフで示している。
【００１７】
第２ないし第９実施例のシリンダライナ素材をシリンダライナ完成品に仕上げる製造工程は、実施例１の製造工程から次の省略工程表に示す工程をそれぞれ省略したものである。
【００１８】
省略工程表
第２及び第３実施例は、焼きなまし処理と水蒸気処理の間において、ホーニングと外径研削を１回実施するだけであるから、焼きなまし処理によるシリンダライナ中間工程品の変形量が比較的大きい場合は適用できない。但し、焼きなまし処理と水蒸気処理の間の工程数が第１実施例よりも少ないから、水蒸気処理による残留応力の解放に伴うシリンダライナ中間工程品の変形量が第１実施例よりも小さい場合に適用することができ、加工工程数が少ないことでコスト的に有利となる。
【００２０】
第２実施例のように、第８工程のホーニングを省略する場合は、第９工程の外径研削ではあまり真円度は変化しないが、第１０工程のホーニングにおいては特に真円度を良くしておく必要がある。又、第３実施例のように、第１０工程のホーニングを省略する場合は、第８工程のホーニング、第９工程の外径研削において真円度を良くしておく必要がある。
【００２１】
第２実施例と第３実施例は、ホーニングと外径研削の順序が逆になる以外は全く同じである。このホーニングと外径研削の順序は、加工条件に応じて適宜に選択される。
【００２２】
第４及び第５実施例は、外径研削を１回実施するだけであるから、焼きなまし処理によるシリンダライナ中間工程品の変形量が比較的大きい場合は適用できない。但し、焼きなまし処理と水蒸気処理の間の工程数が第１実施例よりも少ないから、水蒸気処理による残留応力の解放に伴うシリンダライナ中間工程品の変形量が第１実施例よりも小さい場合に適用することができ、加工工程数が少ないことでコスト的に有利となる。
【００２３】
第４実施例のように、第９工程の外径研削を省略する場合は、ホーニング工程を段階的な加工にしておき、外径研削は一工程で仕上げるようにする。又、第５実施例のように、第１２工程の外径研削を省略する場合は、第９工程の外径研削において精度を出しておく必要がある。
【００２４】
第４実施例と第５実施例は、１回だけ実施する外径研削が、２回目のホーニングと水蒸気処理の前か後かの点で相違ある。いずれを選択するかは、加工条件に応じて適宜に決定される。
【００２５】
第６ないし第９実施例は、ホーニング及び外径研削をそれぞれ１回実施するだけであるから、焼きなまし処理によるシリンダライナ中間工程品の変形量が比較的大きい場合は適用できない。但し、焼きなまし処理と水蒸気処理の間の工程数が第１実施例よりも少ないから、水蒸気処理による残留応力の解放に伴うシリンダライナ中間工程品の変形量が第１実施例よりも小さい場合に適用することができ、加工工程数が２工程も節減することでコスト的には非常に有利となる。
【００２６】
第６実施例ないし第９実施例は、１回だけ実施するホーニング及び外径研削が水蒸気処理の前か後かの点で相違ある。いずれを選択するかは、加工条件に応じて適宜に決定される。
【００２７】
第６実施例は、第１実施例の第８工程ホーニング、第９工程外径研削を省略しているので、第１０工程ホーニングにおいて精度を上げて次工程に進むことが望ましい。第７実施例は、第１実施例の第１０工程ホーニング、第１２工程外径研削を省略しているので、第８工程ホーニング、第９工程外径研削において精度を上げて次工程に進むことが望ましい。第８実施例は、第１実施例の第９工程外径研削、第１０工程ホーニングを省略しているので、第８工程ホーニングにおいて精度を上げておく必要がある。第９実施例は、第１実施例の第８工程ホーニング、第１２工程外径研削を省略しているので、第９工程外径研削において精度を出し、さらに、第１０工程ホーニングにおいても精度を上げておく必要がある。
なお、第１２工程外径研削を省略する第５、第７、第９実施例は、水蒸気皮膜は形成されたままとなるが、ルーズフィットタイプのライナには問題なく適用可能である。
【００２８】
第２ないし第９実施例の完成品検査結果はいずれも合格（○）である。第２ないし第９実施例の上記以外の構成及び効果は第１実施例と同様である。
【００２９】
【発明の効果】
上記のとおり、少なくとも内周面に水蒸気処理による酸化鉄皮膜を備えたシリンダライナの製造方法において、従来方法の工程は、水蒸気処理前に、加工応力が比較的大きい研削加工を実施していたために水蒸気処理によるシリンダライナ中間工程品の変形量が比較的大きく、その後の外径研削等により真円度を修正することが困難であったが、本発明方法の工程は、残留応力の大きい切削及び研削加工の終了後に焼きなまし処理を施して残留応力を解放し、ついで、残留応力が比較的小さいホーニングと外径研削を実施して真円度を補正した後に水蒸気処理を施すから、水蒸気処理の応力解放に伴うシリンダライナ中間工程品の変形量はわずかであり、その後の外径研削等により良好な真円度のシリンダライナ完成品に仕上げられる。このため、本発明方法はシリンダライナの真円度が向上してより真円に近づくことから、検査工数の大幅な節減が可能になるという優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明実施例及び従来例シリンダライナの水蒸気処理後の中間工程品及びポリシング後の完成品の真円度指数を示すグラフである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a cylinder liner for an internal combustion engine, and more specifically, a manufacturing process for finishing a cylinder liner material from a cylinder liner material to a cylinder liner finished product having an iron oxide film by steam treatment on at least a part of the inner peripheral surface. It is related to.
[0002]
[Prior art]
It is known from International Publication No. WO01 / 33065A1 that an inner peripheral surface is subjected to steam treatment to form an iron oxide film in a manufacturing process of a cylinder liner for an internal combustion engine made of cast iron or steel.
[0003]
A cylinder liner having a steam-treated iron oxide film on its inner peripheral surface is manufactured by subjecting a cast cylinder liner material to cutting, grinding, and steam treatment. The conventional manufacturing process is as follows: full length groin cutting → inner surface rough cutting → outer surface rough cutting → inner surface finishing cutting → fine boring (cutting) → outer surface finishing cutting → honing → steam treatment → outer diameter grinding → polishing Accordingly, after rough cutting of the outer surface, an annealing process is performed in order to remove residual stress. Grade inspection is performed on the finished cylinder liner after polishing to rank the products.
[0004]
[Problems to be solved by the invention]
Cutting and grinding in the manufacturing process are machining, and a machining stress is generated and remains in the cylinder liner intermediate process product after processing. The residual stress increases as the machining allowance increases. The steam treatment and the annealing treatment are heat treatments of heating and gradual cooling, and the residual stress of the cylinder liner intermediate product after the treatment is released and removed. Therefore, the cylinder liner intermediate product is deformed. The amount of deformation increases as the removed residual stress increases.
[0005]
In the conventional process, even if the annealing process is performed, the deformation amount of the cylinder liner intermediate process product due to the steam process is relatively large, the roundness is lowered, and a defective product that remains as a residue during outer diameter grinding occurs. There was also. For this reason, there has been a problem that excessive man-hours are required for the grade inspection of the finished cylinder liner.
[0006]
The present invention has been made to solve this problem, and its object is to improve the accuracy by suppressing the amount of deformation of the intermediate product of the cylinder liner due to the steam treatment.
[0007]
[Means for Solving the Problems]
The inventor of the present application stated that the reason why the deformation amount due to the steam treatment of the intermediate process of the cylinder liner is relatively large regardless of the implementation of the annealing treatment is that the cylinder liner is between the annealing treatment and the steam treatment. The present invention has been reached as a result of repeating the test of reducing the residual stress by recombining the processes from the annealing process to the steaming process, considering that the residual stress generated in the intermediate process product is relatively large.
[0008]
In order to achieve the above-mentioned object, the means employed by the present invention is the full-length groin cutting, internal rough cutting, external rough cutting, fine internal boring, fine boring, external surface, which has a large machining allowance and a large processing stress before annealing treatment. After finishing cutting, between the annealing treatment and the steam treatment, only the honing and outer diameter grinding with less machining allowance and less processing stress are performed, and after the steam treatment, the outer diameter grinding and polishing with very little machining allowance. Only in the manufacturing process.
[0009]
The relatively large residual stress generated in the intermediate process of the cylinder liner due to the processing performed before the annealing treatment is removed by annealing treatment, and the relatively large deformation caused thereby is corrected by the next honing and outer diameter grinding. , Preventing a decrease in roundness. Since the residual stress generated in the cylinder liner intermediate process product by this honing and outer diameter grinding is small, the amount of deformation due to the subsequent steam treatment is extremely small, and the cylinder liner intermediate process product maintains good roundness. Therefore, the manufacturing process of the present invention can finish the cylinder liner material into a finished cylinder liner with good accuracy.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The cylinder liner manufacturing method of the present invention will be described based on the first embodiment and the conventional example. The manufacturing process of the first example and the conventional example is shown in the process chart, and the roundness index of the cylinder liner intermediate process product after each process from the finishing finish to the steam treatment and the finished product after polishing are roundness. Each is shown in the index table. The index is a numerical value with the roundness of the cylinder liner intermediate product after the steam treatment of the conventional example as 100. FIG. 1 is a graph showing the roundness index of the intermediate process product after the steam treatment of the cylinder liner of the first embodiment and the conventional example and the finished product after polishing.
[0011]
Process Table Process First Example Conventional Example 1 Process Full Length Inguinal Cutting Full Length Inguinal Cutting Second Process Internal Rough Cutting Internal Rough Cutting 3rd External Rough Cutting External Rough Cutting 4th Internal Finishing Internal Cutting Internal Finishing 5 steps Fine boring Fine boring 6th step External finish cutting External finish 7th step Annealing treatment Honing 8th step Honing Steam treatment 9th step External grinding External grinding 10th step Honing Polishing 11th step Steam treatment 12th outside Diameter grinding 13th step Polishing [0012]
The conventional example without annealing treatment has 10 steps, but the first embodiment has 13 steps, which is increased by 3 steps. The increased processes are annealing, honing, and outer diameter grinding.
[0013]
[Table 1]
Roundness index table
In both the first example and the conventional example, the first process to the sixth process are processes with a large machining allowance, so the residual stress due to the process is large. In the first embodiment, since the annealing process is performed in the seventh process, the residual stress from the first process to the sixth process and the casting stress before processing are released, but the cylinder liner intermediate process product is deformed by the stress release. . For this reason, the roundness index 81.4 before the annealing process of the intermediate product of the cylinder liner deteriorates to 147.3 after the annealing process. However, the roundness index of the intermediate product of the cylinder liner is improved to 27.7 because the honing in the eighth step, the outer diameter grinding in the ninth step, and the honing in the tenth step improve the roundness. Since the eighth process to the tenth process are processes with a small machining allowance and the residual stress due to the process is small, the cylinder liner intermediate process even if the residual stress is released in the steam process of the next eleventh process. Almost no deformation occurs in the product. For this reason, the roundness index of the cylinder liner intermediate process product after the steam treatment is 26.5, which is substantially the same as before the steam treatment. The roundness index of the finished cylinder liner obtained by grinding the outer diameter in the twelfth step and adjusting the roughness of the inner periphery by polishing in the thirteenth step is 26.5. The inspection result of the finished product is acceptable (O).
[0015]
On the other hand, since the conventional example releases a large residual stress by the steam treatment in the eighth step, the deformation amount of the cylinder liner intermediate process product after the steam treatment is large, and the roundness index is 21 after the honing in the seventh step. Deteriorates from 8 to 100 at once. Since this decrease in roundness cannot be corrected by the outer diameter grinding in the ninth step and the polishing in the tenth step, the roundness index of the finished cylinder liner remains at 87.3. The inspection result of the finished product is rejected (x).
[0016]
【Example】
Next, second to ninth embodiments of the present invention will be described. In the roundness index table, the roundness index of the cylinder liner intermediate process product after each process from after finishing the outer surface of the second to ninth embodiments to after the steam treatment and the finished product after polishing are shown. . FIG. 1 is a graph showing the roundness index of the intermediate process product after the steam treatment of the cylinder liner of the first, second, fourth, sixth and eighth embodiments and the finished product after polishing. Yes.
[0017]
The manufacturing process for finishing the cylinder liner material of the second to ninth embodiments into a finished cylinder liner is obtained by omitting the steps shown in the following abbreviated process table from the manufacturing process of the first embodiment.
[0018]
Abbreviated process chart
In the second and third embodiments, only the honing and the outer diameter grinding are performed once between the annealing process and the steaming process. Therefore, when the deformation amount of the intermediate process product of the cylinder liner due to the annealing process is relatively large. Not applicable. However, since the number of steps between the annealing treatment and the steam treatment is smaller than that in the first embodiment, it is applied when the deformation amount of the cylinder liner intermediate process product due to the release of the residual stress by the steam treatment is smaller than that in the first embodiment. This is advantageous in terms of cost because the number of processing steps is small.
[0020]
When the honing of the eighth step is omitted as in the second embodiment, the roundness does not change much in the outer diameter grinding of the ninth step, but the roundness is particularly improved in the honing of the tenth step. It is necessary to keep. Further, when honing in the tenth step is omitted as in the third embodiment, it is necessary to improve the roundness in the honing in the eighth step and the outer diameter grinding in the ninth step.
[0021]
The second and third embodiments are exactly the same except that the order of honing and outer diameter grinding is reversed. The order of the honing and outer diameter grinding is appropriately selected according to the processing conditions.
[0022]
In the fourth and fifth embodiments, the outer diameter grinding is performed only once. Therefore, the fourth and fifth embodiments are not applicable when the deformation amount of the cylinder liner intermediate process product by the annealing process is relatively large. However, since the number of steps between the annealing treatment and the steam treatment is smaller than that in the first embodiment, it is applied when the deformation amount of the cylinder liner intermediate process product due to the release of the residual stress by the steam treatment is smaller than that in the first embodiment. This is advantageous in terms of cost because the number of processing steps is small.
[0023]
When the outer diameter grinding in the ninth process is omitted as in the fourth embodiment, the honing process is performed in stages, and the outer diameter grinding is finished in one process. Further, when the outer diameter grinding in the twelfth step is omitted as in the fifth embodiment, it is necessary to obtain accuracy in the outer diameter grinding in the ninth step.
[0024]
The fourth embodiment and the fifth embodiment are different in that the outer diameter grinding performed only once is before or after the second honing and the steam treatment. Which to select is appropriately determined according to the processing conditions.
[0025]
In the sixth to ninth embodiments, honing and outer diameter grinding are performed only once, and therefore cannot be applied when the amount of deformation of the intermediate product of the cylinder liner due to the annealing process is relatively large. However, since the number of steps between the annealing treatment and the steam treatment is smaller than that in the first embodiment, it is applied when the deformation amount of the cylinder liner intermediate process product due to the release of the residual stress by the steam treatment is smaller than that in the first embodiment. The number of processing steps can be reduced by two, which is very advantageous in terms of cost.
[0026]
The sixth to ninth embodiments are different in that honing and outer diameter grinding performed only once are before or after the steam treatment. Which to select is appropriately determined according to the processing conditions.
[0027]
In the sixth embodiment, the 8th step honing and the 9th step outer diameter grinding of the first embodiment are omitted, so it is desirable to increase the accuracy in the 10th step honing and proceed to the next step. In the seventh embodiment, the 10th step honing and the 12th step outer diameter grinding of the first embodiment are omitted, and therefore the accuracy is increased in the eighth step honing and the ninth step outer diameter grinding to proceed to the next step. Is desirable. In the eighth example, the ninth step outer diameter grinding and the tenth step honing of the first example are omitted, so it is necessary to increase the accuracy in the eighth step honing. In the ninth embodiment, the 8th step honing and the 12th step outer diameter grinding of the first embodiment are omitted, so that the accuracy is obtained in the ninth step outer diameter grinding, and further, the accuracy is also obtained in the 10th step honing. It needs to be raised.
The fifth, seventh, and ninth examples omitting the outer diameter grinding of the twelfth step remain formed with the water vapor film, but can be applied to the loose-fit type liner without any problem.
[0028]
The finished product inspection results of the second to ninth examples are all acceptable (◯). The other configurations and effects of the second to ninth embodiments are the same as those of the first embodiment.
[0029]
【The invention's effect】
As described above, in the method of manufacturing a cylinder liner having at least an inner peripheral surface provided with an iron oxide film by steam treatment, the process of the conventional method is because grinding processing with a relatively large machining stress is performed before the steam treatment. The amount of deformation of the cylinder liner intermediate process product due to the steam treatment was relatively large, and it was difficult to correct the roundness by the subsequent outer diameter grinding or the like. After the grinding process is finished, annealing is performed to release residual stress, and then the honing and outer diameter grinding with relatively small residual stress is performed to correct the roundness, and then steam treatment is performed. The amount of deformation of the cylinder liner intermediate process product resulting from the release is small, and the cylinder liner finished product with good roundness can be finished by subsequent outer diameter grinding or the like. For this reason, since the roundness of a cylinder liner improves and it approaches a perfect circle more, the method of this invention has the outstanding effect that a significant saving of an inspection man-hour is attained.
[Brief description of the drawings]
FIG. 1 is a graph showing the roundness index of an intermediate process product after steam treatment and a finished product after polishing of a cylinder liner of an embodiment of the present invention and a conventional example.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP2002158398A JP3916058B2 (en) | 2001-06-15 | 2002-05-31 | Cylinder liner manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2001181405 | 2001-06-15 | ||
| JP2001-181405 | 2001-06-15 | ||
| JP2002158398A JP3916058B2 (en) | 2001-06-15 | 2002-05-31 | Cylinder liner manufacturing method |
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| JP2003074407A JP2003074407A (en) | 2003-03-12 |
| JP3916058B2 true JP3916058B2 (en) | 2007-05-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8070217B2 (en) | 2009-05-28 | 2011-12-06 | Honda Motor Co., Ltd. | Vehicle body rear part structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2135694A4 (en) * | 2007-03-15 | 2010-08-18 | Honda Motor Co Ltd | Hollow member, cylinder sleeve and methods for producing them |
| JP5111903B2 (en) * | 2007-03-15 | 2013-01-09 | 本田技研工業株式会社 | Cylinder sleeve manufacturing method |
| CN107639223B (en) * | 2017-07-25 | 2019-08-20 | 中原内配集团安徽有限责任公司 | A kind of preparation process of Cast iron liner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8070217B2 (en) | 2009-05-28 | 2011-12-06 | Honda Motor Co., Ltd. | Vehicle body rear part structure |
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