KR100580048B1 - Structure and method of hardening for cylinder block bore surface - Google Patents

Structure and method of hardening for cylinder block bore surface Download PDF

Info

Publication number
KR100580048B1
KR100580048B1 KR1019990067651A KR19990067651A KR100580048B1 KR 100580048 B1 KR100580048 B1 KR 100580048B1 KR 1019990067651 A KR1019990067651 A KR 1019990067651A KR 19990067651 A KR19990067651 A KR 19990067651A KR 100580048 B1 KR100580048 B1 KR 100580048B1
Authority
KR
South Korea
Prior art keywords
hardening
hardened
bore
cylinder block
circumferential
Prior art date
Application number
KR1019990067651A
Other languages
Korean (ko)
Other versions
KR20010066069A (en
Inventor
김종문
Original Assignee
현대자동차주식회사
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1019990067651A priority Critical patent/KR100580048B1/en
Publication of KR20010066069A publication Critical patent/KR20010066069A/en
Application granted granted Critical
Publication of KR100580048B1 publication Critical patent/KR100580048B1/en

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation

Abstract

본 발명은 실린더 블록 보어 내면의 경화구조 및 경화방법에 관한 것으로, 라이너가 삭제된 보어 내면을 경화 처리하여 경화부를 형성시 Nd-YAG 레이저를 이용하여 별도의 세정공정, 레이저 흡수재 도포공정 및 고주파 담금질을 통한 소려공정을 삭제하고 경화부의 경화구조를 경사진 십자 형태로 형성하여 경화부 설계 자유도를 향상할 수 있는 실린더 블록 보어 내면의 경화구조 및 경화방법을 제공하고자 한 것이다.The present invention relates to a hardening structure and a hardening method of the inner surface of the cylinder block bore, and to form a hardened portion by hardening the inner surface of the bore in which the liner is removed, using a Nd-YAG laser, a separate cleaning process, a laser absorber coating process, and a high frequency quenching. The purpose of the present invention is to provide a hardening structure and a hardening method of the inner surface of a cylinder block bore that can improve the degree of freedom in designing a hardened part by eliminating the soaking process through the hardened structure and forming a hardened structure in an inclined cross shape.

실린더 블록, 보어, 내면, 경화부, 레이저Cylinder block, bore, inner surface, hardened part, laser

Description

실린더 블록 보어 내면의 경화구조 및 경화방법{Structure and method of hardening for cylinder block bore surface} Structure and method of hardening for cylinder block bore surface             

도 1은 본 발명에 따른 경화방법에 의해 형성된 실린더 블록 보어 내면의 경화구조를 나타내는 전개도1 is a development view showing a hardening structure of the inner surface of the cylinder block bore formed by the hardening method according to the present invention;

도 2는 일반적인 라이너가 없는 실린더 블록을 나타내는 단면도Figure 2 is a cross-sectional view showing a cylinder block without a typical liner

도 3은 종래의 경화방법에 의해 형성된 실린더 블록 보어 내면의 경화구조를 나타내는 전개도Figure 3 is a development view showing the hardening structure of the inner surface of the cylinder block bore formed by a conventional hardening method

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 실린더 블록 20 : 피스톤10: cylinder block 20: piston

30 : 보어 32 : 보어 내면30: Bore 32: Bore Inside

40 : 경화처리부 41 : 경화부40: hardened portion 41: hardened portion

42 : 원주방향 경화부 44 : 축방향 경화부42: circumferential hardened portion 44: axial hardened portion

본 발명은 실린더 블록 보어 내면의 경화구조 및 경화방법에 관한 것으로, 더욱 상세하게는 라이너가 삭제된 보어 내면을 경화 처리하여 경화부를 형성시 Nd-YAG 레이저를 이용하여 별도의 세정공정, 레이저 흡수재 도포공정 및 고주파 담금질을 통한 소려공정을 삭제하고 경화부의 경화구조를 경사진 십자 형태로 형성하여 경화부 설계 자유도를 향상할 수 있는 실린더 블록 보어 내면의 경화구조 및 경화방법에 관한 것이다.The present invention relates to a hardening structure and a hardening method of an inner surface of a cylinder block bore, and more particularly, to form a hardened part by hardening an inner surface of a bore in which a liner has been removed, and using an Nd-YAG laser to apply a separate cleaning process and applying a laser absorber. The present invention relates to a hardening structure and a hardening method of an inner surface of a cylinder block bore that can improve the degree of freedom in designing a hardened part by eliminating a process and a soaking process through high frequency quenching and forming a hardened structure in an inclined cross shape.

일반적으로 실린더 블록 내주면인 보어 내면에는 연소압력을 직접받고 연소의 고온에 견디기 충분한 강도를 갖는 특수주철인 실린더 라이너(cylinder liner)가 끼워지나 최근에는 원가절감의 차원에서 실린더 블록 보어 내면을 레이저에 의해 경화하여 실린더 라이너가 삭제된 실린더 블록을 개발하고 있다.Generally, the cylinder liner, which is a special cast iron, is inserted into the inner surface of the bore, which is the inner circumferential surface of the cylinder block, and has sufficient strength to withstand the high temperature of combustion. A cylinder block has been developed that has been cured and the cylinder liner has been removed.

첨부한 도 2는 일반적인 라이너가 없는 실린더 블록을 나타내는 단면도이고, 도 3은 종래의 경화방법에 의해 형성된 실린더 블록 보어 내면의 경화구조를 나타내는 전개도이다.FIG. 2 is a cross-sectional view showing a cylinder block without a general liner, and FIG. 3 is a development view showing a hardening structure of an inner surface of a cylinder block bore formed by a conventional hardening method.

이에 도시한 바와 같이, 실린더 블록(10)의 보어(30)에는 피스톤(20)이 축방향으로 왕복운동 하는 바, 보어 내면(32)의 경화처리부(40)는 기체 레이저인 CO2 레이저 빔의 주사에 의해 다수의 경화부(41)가 형성된다.As shown in FIG. 2, the piston 20 reciprocates in the bore 30 of the cylinder block 10 in the axial direction. Thus, the hardened portion 40 of the inner surface 32 of the bore 30 is formed of a CO 2 laser beam. A plurality of hardened portions 41 are formed by scanning.

특히, 상기 경화부(41)는 레이저의 경화에 의하여 원주방향으로 일정길이를 갖으며 경화되고 축방향으로 복수열이 형성되는 바, 축방향으로 인접한 경화부(41)는 서로 원주방향으로 어긋나게 형성되고 경화부(41)의 간극(c)은 피스톤링 또는 오일링의 폭보다 좁게 형성된다.In particular, the hardened portion 41 has a certain length in the circumferential direction by curing the laser and is cured and a plurality of rows are formed in the axial direction, the hardened portion 41 adjacent to the axial direction is formed to shift in the circumferential direction The gap c of the hardened part 41 is formed to be narrower than the width of the piston ring or the oil ring.

이러한 경화구조를 갖는 실린더 블록 보어 내면을 경화하는 방법은 다음과 같다.The method of hardening the inner surface of the cylinder block bore having such a hardening structure is as follows.

먼저 보어 내면(32)을 세정하는 공정 후, 상기 보어 내면(32)에 레이저 흡수재를 도포하는 공정을 실시하고, 상기 레이저 흡수재가 도포된 보어 내면(32)에 CO2 레이저 빔을 주사하여 원주방향과 축방향으로 복수열의 경화부(41)를 형성한다.First, after the bore inner surface 32 is cleaned, a process of applying a laser absorber to the bore inner surface 32 is performed, and a CO 2 laser beam is scanned on the bore inner surface 32 to which the laser absorber is applied to the circumferential direction. In the axial direction, a plurality of rows of hardened portions 41 are formed.

다음으로, 유도전류의 표피효과로 표면을 가열하여 담금질 온도가 되었을 때 냉각수를 분사하여 표면을 경화처리하는 고주파 담금질을 통하여 경화부(41)를 원하는 경도를 갖도록 소려한 후, 정밀입자 가공인 호닝 가공하는 공정으로 이루어진다.Next, when the surface is heated by the skin effect of the induction current and the quenching temperature is reached, the hardening part 41 is considered to have a desired hardness through high frequency quenching by spraying cooling water to cure the surface. It consists of the process of processing.

그러나, 경화부(41) 사이의 간극(c)이 피스톤링 폭보다 좁게 형성되므로 열처리 공정의 어려움 및 열영향부에 의한 물성이 저하되며 호닝 가공 후, 비경화부가 더 많이 마모되는 경화부(41)와 비경화부 간의 마모단차에 의해 폭발압의 저하 및 블로바이가스(blow-by gas)가 많이 발생하는 문제점이 있었다.However, since the gap c between the hardened portions 41 is formed to be narrower than the piston ring width, the difficulty of the heat treatment process and the physical properties due to the heat affected zone are reduced, and after the honing process, the hardened portion 41 is worn more. ) And a decrease in the explosion pressure and a lot of blow-by gas due to the wear step between the non-hardened portion.

본 발명은 상기와 같은 문제점을 감안하여 안출한 것으로, 라이너가 삭제된 보어 내면을 경화 처리하여 경화부를 형성시 Nd-YAG 레이저를 이용하여 별도의 세정공정, 레이저 흡수재 도포공정 및 고주파 담금질을 통한 소려공정을 삭제하고 경화부의 경화구조를 경사진 십자 형태로 형성하여 경화부 설계 자유도를 향상할 수 있는 실린더 블록 보어 내면의 경화구조 및 경화방법을 제공하는데 그 목적이 있다.
The present invention has been made in view of the above problems, and when using the Nd-YAG laser to form a hardened portion by hardening the inner surface of the bore with the liner is removed, a separate cleaning process, laser absorber coating process and high frequency quenching It is an object of the present invention to provide a hardening structure and a hardening method of the inner surface of a cylinder block bore that can eliminate the process and form a hardened structure of the hardened portion in an inclined cross shape, thereby improving the degree of freedom in designing the hardened portion.

이하 첨부도면을 참조하여 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 보어 내면(32)의 경화처리부(40)에 다수의 경화부(41)가 원주방향으로 일정길이를 갖으며 축방방향으로 복수열이 형성되는 동시에 축방향으로 인접한 경화부(41)는 서로 원주방향으로 어긋나게 형성된 실린더 블록 보어 내면의 경화구조에 있어서, 상기 경화처리부(40)에 원주방향 경화부(42)와 상기 원주방향 경화부(42)에 직교하도록 축방향 경화부(44)를 중첩 형성하되 상기 경화부(41)는 축방향으로 보어 내면(32)의 원주면에 대하여 경사각(α)을 이루며 형성된 것을 특징으로 한다.According to the present invention, a plurality of hardened portions 41 have a predetermined length in the circumferential direction and a plurality of rows are formed in the axial direction, and the hardened portions 41 adjacent to the axial direction are formed on the hardened portion 40 of the bore inner surface 32. In the hardening structure of the inner surface of the cylinder block bore formed shifting in the circumferential direction, the axial hardening portion 44 is orthogonal to the hardening treatment portion 40 so as to be orthogonal to the circumferential curing portion 42 and the circumferential curing portion 42. Although overlapping is formed, the hardened portion 41 is characterized by forming an inclination angle α with respect to the circumferential surface of the inner surface 32 in the axial direction.

특히, 상기 경사각(α)은 5°내지 15°인 것을 특징으로 한다.In particular, the inclination angle (α) is characterized in that 5 ° to 15 °.

또한 본 발명은 보어 내면(32)을 세정하는 공정과, 상기 보어 내면(32)에 레이저 흡수재를 도포하는 공정과, 상기 레이저 흡수재가 도포된 보어 내면(32)에 기 체 레이저인 CO2 레이저 빔을 주사하여 경화부(41)를 형성하는 공정과, 고주파 담금질을 통하여 경화부(41)를 원하는 경도를 갖도록 소려하는 공정과, 상기 소려된 보어 내면(32)을 정밀입자 가공인 호닝 가공하는 공정으로 이루어진 실린더 블록 보어 내면의 경화방법에 있어서, 상기 보어 내면(32)을 세정하는 공정과 레이저 흡수재를 도포하는 공정은 삭제되고, 고체 레이저인 Nd-YAG 레이저 빔을 주사하여 경화부(41)를 형성하며, 고주파 담금질을 통한 소려 공정과 호닝 가공 공정이 삭제된 것을 특징으로 한다.The present invention also provides a process for cleaning the bore inner surface 32, applying a laser absorber to the bore inner surface 32, and a CO 2 laser beam as a gas laser on the bore inner surface 32 to which the laser absorber is applied. Scanning to form a hardened portion 41, a process of considering the hardened portion 41 to have a desired hardness through high-frequency quenching, and a process of honing the bore inner surface 32, which is the precision particle processing. In the hardening method of the inner surface of the cylinder block bore consisting of, the process of cleaning the inner surface of the bore 32 and the process of applying the laser absorber are eliminated, and the hardened portion 41 is scanned by scanning the Nd-YAG laser beam which is a solid laser. It is characterized in that the sourcing process and honing processing process through high frequency quenching is eliminated.

본 발명을 좀 더 상세히 설명하면 다음과 같다.The present invention is described in more detail as follows.

첨부한 도 1은 본 발명에 따른 경화방법에 의해 형성된 실린더 블록 보어 내면의 경화구조를 나타내는 전개도로써, 실린더 블록 보어 내면(32)의 경화처리부(40)에 Nd-YAG 레이저 빔을 주사하여 보어 내면(32)의 원주면에 대하여 5°내지 15°, 바람직하게는 10°, 경사진 경사각(α)을 갖는 경화부(41)를 형성한다.1 is an exploded view showing the hardening structure of the inner surface of the cylinder block bore formed by the hardening method according to the present invention. The inner surface of the cylinder block bore 32 is scanned by scanning an Nd-YAG laser beam on the hardened portion 40. The hardened part 41 is formed with the inclination-angle (alpha) which is 5 degrees-15 degrees, Preferably it is 10 degrees with respect to the circumferential surface of (32).

상기 경화부(41)는 원주방향 경화부(42)와 상기 원주방향 경화부(42)에 직교하는 축방향 경화부(44)가 중첩 형성되고, 축방향으로 복수열이 형성되는 바, 축방향으로 인접한 경화부(41)는 서로 원주방향으로 어긋나게 형성된다.The hardened portion 41 is formed by overlapping the circumferential hardened portion 42 and the axial hardened portion 44 orthogonal to the circumferential hardened portion 42, and a plurality of rows are formed in the axial direction. Adjacent hardened portions 41 are formed to be shifted from each other in the circumferential direction.

또한, 상기 원주방향 경화부(42)와 축방향 경화부(44)는 그 형성되는 패턴의 길이와 폭이 동일하게 형성된다.In addition, the circumferential cured portion 42 and the axial cured portion 44 are formed in the same length and width of the pattern formed.

따라서, 종래에는 축방향으로 인접한 경화부(41) 사이의 간극(c)은 피스톤링 의 폭보다 좁아야 하나, 경사각(α)을 이루며 직교되는 원주방향 경화부(41)와 축방향 경화부(42)가 중첩 형성되어 각 경화부(41)의 간극이 피스톤링의 폭보다 좁지 않아도 되므로 경화부(41) 패턴의 설계 자유도를 향상할 수 있고, 경화부(41) 사이의 간극이 피스톤링 폭보다 넓게 형성할 수 있으므로 레이저에 의한 열처리 공정 및 열영향부에 의해 물성이 저하되는 현상을 방지할 수 있는 것이다.Therefore, in the related art, the gap c between the hardened portions 41 adjacent in the axial direction should be narrower than the width of the piston ring, but the circumferential hardened portion 41 and the axial hardened portion (orthogonal to form an inclination angle?) 42 is formed overlapping, so that the gap between each hardened portion 41 does not have to be narrower than the width of the piston ring, so that the degree of freedom in designing the hardened portion 41 pattern can be improved, and the gap between the hardened portions 41 is the piston ring width. Since it can be formed more widely, it is possible to prevent the phenomenon that the physical properties are degraded by the heat treatment step and the heat affected by the laser.

또한, 보어 내면(32)의 세정공정, 레이저 흡수재 도포공정 및 고주파 담금질 공정이 삭제되고, 호닝 가공 공정이 삭제되므로 경화부(41)와 비경화부의 마모단차에 의해 발생하는 블로바이가스의 발생량을 저감할 수 있는 것이다.In addition, since the cleaning process of the inner surface of the bore 32, the laser absorber coating process, and the high frequency quenching process are eliminated, and the honing process is eliminated, the amount of blow-by gas generated by the wear step of the hardened part 41 and the non-hardened part is eliminated. It can be reduced.

이상에서 상술한 바와 같이, 본 발명에 따른 실린더 블록 보어 내면의 경화구조 및 경화방법에 의하면 라이너가 삭제된 보어 내면을 경화 처리하여 경화부를 형성시 Nd-YAG 레이저를 이용하여 별도의 세정공정, 레이저 흡수재 도포공정 및 고주파 경화를 통한 소려공정을 삭제하고 경화부의 경화구조를 경사진 십자 형태로 형성하여 경화부 설계 자유도를 향상할 수 있고, 블로바이가스의 발생량을 저감할 수 있는 효과가 있다.As described above, according to the hardening structure and hardening method of the inner surface of the cylinder block bore according to the present invention, when the hardened portion is formed by hardening the inner surface of the bore in which the liner is removed, a separate cleaning process using a Nd-YAG laser, a laser By eliminating the absorbing process through the absorbing material coating process and high frequency curing and forming the hardened structure of the hardened portion in an inclined cross shape, the degree of freedom in designing the hardened portion can be improved, and the amount of blow-by gas can be reduced.

Claims (3)

보어 내면(32)의 경화처리부(40)에 다수의 경화부(41)가 원주방향으로 일정길이를 갖으며 축방향으로 복수열이 형성되는 동시에 축방향으로 인접한 경화부(41)는 서로 원주방향으로 어긋나게 형성된 실린더 블록 보어 내면의 경화구조에 있어서, The plurality of hardened portions 41 have a predetermined length in the circumferential direction and a plurality of rows are formed in the axial direction, and the hardened portions 41 adjacent in the axial direction are circumferentially formed on the hardened portion 40 of the bore inner surface 32. In the hardening structure of the inner surface of the cylinder block bore formed by 상기 경화처리부(40)에 원주방향 경화부(42)와 상기 원주방향 경화부(42)에 십자형으로 직교하도록 축방향 경화부(44)를 중첩 형성하되 상기 경화부(41)는 축방향으로 보어 내면(32)의 원주면에 대하여 10°의 경사각(α)을 이루며 형성된 것을 특징으로 하는 실린더 블록 보어 내면의 경화구조.The circumferential hardening portion 42 and the circumferential hardening portion 42 are formed to overlap the circumferential hardening portion 42 so as to cross at right angles in crosswise direction, but the hardening portion 41 is axially bored. Hardening structure of the inner surface of the cylinder block bore, characterized by forming an inclination angle (α) of 10 ° with respect to the circumferential surface of the inner surface (32). 삭제delete 삭제delete
KR1019990067651A 1999-12-31 1999-12-31 Structure and method of hardening for cylinder block bore surface KR100580048B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019990067651A KR100580048B1 (en) 1999-12-31 1999-12-31 Structure and method of hardening for cylinder block bore surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019990067651A KR100580048B1 (en) 1999-12-31 1999-12-31 Structure and method of hardening for cylinder block bore surface

Publications (2)

Publication Number Publication Date
KR20010066069A KR20010066069A (en) 2001-07-11
KR100580048B1 true KR100580048B1 (en) 2006-05-12

Family

ID=19634753

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019990067651A KR100580048B1 (en) 1999-12-31 1999-12-31 Structure and method of hardening for cylinder block bore surface

Country Status (1)

Country Link
KR (1) KR100580048B1 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57186044A (en) * 1981-05-11 1982-11-16 Teikoku Piston Ring Co Ltd Cylinder having internal peripheral surface treated by laser hardening
JPS58133454A (en) * 1982-02-03 1983-08-09 Teikoku Piston Ring Co Ltd Cylinder whose inner circumference is treated by hardening
JPS59212572A (en) * 1983-05-14 1984-12-01 Teikoku Piston Ring Co Ltd Cylinder with inner periphery subjected treatment by laser hardening
JPS62240715A (en) * 1986-04-11 1987-10-21 Mitsubishi Motors Corp Method and apparatus for hardening cylinder block
JPH074303A (en) * 1993-06-15 1995-01-10 Mitsubishi Motors Corp Cylinder for engine and thermal refining method of inner face of cylinder
KR19990033540A (en) * 1997-10-24 1999-05-15 류정열 Surface Treatment of Cylinder Bore of Engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57186044A (en) * 1981-05-11 1982-11-16 Teikoku Piston Ring Co Ltd Cylinder having internal peripheral surface treated by laser hardening
JPS58133454A (en) * 1982-02-03 1983-08-09 Teikoku Piston Ring Co Ltd Cylinder whose inner circumference is treated by hardening
JPS59212572A (en) * 1983-05-14 1984-12-01 Teikoku Piston Ring Co Ltd Cylinder with inner periphery subjected treatment by laser hardening
JPS62240715A (en) * 1986-04-11 1987-10-21 Mitsubishi Motors Corp Method and apparatus for hardening cylinder block
JPH074303A (en) * 1993-06-15 1995-01-10 Mitsubishi Motors Corp Cylinder for engine and thermal refining method of inner face of cylinder
KR19990033540A (en) * 1997-10-24 1999-05-15 류정열 Surface Treatment of Cylinder Bore of Engine

Also Published As

Publication number Publication date
KR20010066069A (en) 2001-07-11

Similar Documents

Publication Publication Date Title
FI76120B (en) FOERFARANDE FOER FRAMSTAELLNING AV SLITSTARKA CYLINDERLOPPSYTOR I FOERBRAENNINGSMOTORER.
US7617805B2 (en) Cylinder liner and method construction thereof
US4643079A (en) Iron piston having selectively hardened ring groove
CA1128434A (en) High pressure fuel injection tubing material and method of manufacturing the same
US4247972A (en) Method of manufacturing a piston ring
CA1117158A (en) Piston ring and method of manufacture
GB2212595A (en) Cams with hardened lobes
KR100580048B1 (en) Structure and method of hardening for cylinder block bore surface
US6485027B1 (en) Surface heat treatment of piston rings
US4714809A (en) Method and apparatus for shaping the surfaces of cams on a camshaft
JP4417481B2 (en) Reciprocating piston Piston for internal combustion engine
US11414718B2 (en) Method for the surface treatment of a steel Yankee
Doyon et al. Induction hardening of crankshafts and camshafts
JP2009007677A (en) Method for manufacturing caterpillar band bush
US6648995B2 (en) Method of quenching workpiece with hole, assistive tool for use in quenching, and crankshaft
JP4115062B2 (en) Fretting-resistant multi-piece rim
JPS59126167A (en) Cylinder quenched by laser
SU1715864A1 (en) Method of reconditioning plunger-and-sleeve pairs of diesel engine high-pressure fuel pumps
JP3600341B2 (en) Cylinder liner
JPH1161264A (en) Crawler bush and its manufacture
JP2000073121A (en) Crawler bush, its hardening method and hardening device
KR20010059705A (en) Method of hardening for cylinder block bore surface using mask
KR19990033540A (en) Surface Treatment of Cylinder Bore of Engine
JPH0583614B2 (en)
JPS59133868A (en) Sliding member of cast iron to be used in internal- combustion engine and manufacturing method of the same

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee