KR100273466B1 - Piston-ring-groove heat treatment system - Google Patents
Piston-ring-groove heat treatment system Download PDFInfo
- Publication number
- KR100273466B1 KR100273466B1 KR1019980026532A KR19980026532A KR100273466B1 KR 100273466 B1 KR100273466 B1 KR 100273466B1 KR 1019980026532 A KR1019980026532 A KR 1019980026532A KR 19980026532 A KR19980026532 A KR 19980026532A KR 100273466 B1 KR100273466 B1 KR 100273466B1
- Authority
- KR
- South Korea
- Prior art keywords
- piston
- ring
- heat treatment
- cooling water
- ring groove
- Prior art date
Links
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
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- 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
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
본 발명은 주철제 피스톤 및 강철제 피스톤 크라운의 링그로브가 높은 경도를 갖도록 열처리를 행하는 피스톤 링그로브 열처리 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston ring glove heat treatment apparatus for performing heat treatment such that the ring grooves of a cast iron piston and a steel piston crown have a high hardness.
본 발명의 피스톤 링그로브 열처리 장치는 피스톤을 수평상태로 회전시키는 피스톤 회전수단과,Piston ring grove heat treatment apparatus of the present invention and the piston rotating means for rotating the piston in a horizontal state,
상기 피스톤의 링그로브에 삽입되어 링그로브를 고주파 가열시키는 냉각형 가열코일과,A cooling heating coil inserted into the ring groove of the piston to heat the ring groove at a high frequency;
가열된 링그로브에 냉각수를 분사시키는 냉각수 파이프와,A coolant pipe for injecting coolant into the heated ring groove,
냉각수 파이프에서 분사되는 냉각수를 공기압으로 비산시키는 에어 파이프를 구비시킴으로써 이루어 지며,It is made by having an air pipe that scatters the cooling water sprayed from the cooling water pipe to the air pressure,
이와 같은 본 발명은 피스톤의 링그로브를 가열코일로 가열시키면서 냉각수를 비산시키며 냉각처리를 하기때문에 균열이 발생되지 않고 경고값을 높게 갖게 되어 피스톤의 수명을 연장시키고 엔진출력을 높일 수 있는 효과가 있는 것이다.The present invention has the effect of extending the life of the piston and increasing the engine output by raising the warning value without cracking because the cooling water is scattered and the cooling treatment while heating the ring groove of the piston with a heating coil will be.
Description
본 발명은 주철제 피스톤 및 강철제 피스톤 크라운의 링그로브가 높은 경도를 갖도록 열처리를 행하는 피스톤 링그로브 열처리 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston ring glove heat treatment apparatus for performing heat treatment such that the ring grooves of a cast iron piston and a steel piston crown have a high hardness.
피스톤과 피스톤 크라운의 수명은 링그로브의 마모에 따라 결정된다.The life of the piston and piston crown is determined by the wear of the ringgrove.
도 1 에 도시된 바와 같인 피스톤(1)의 링그로브(2)에는 피스톤링(3)이 끼워지게 되고 상기 피스톤(1)은 도 2 에 도시된 바와 같이 실린더(4) 내부에 삽입되며 피스톤링(3)은 실린더(4) 내벽과 피스톤(1) 외벽과의 기밀을 유지하게 된다.A piston ring 3 is fitted into the ring groove 2 of the piston 1 as shown in FIG. 1, and the piston 1 is inserted into the cylinder 4 as shown in FIG. 2 and the piston ring. (3) maintains the airtightness between the inner wall of the cylinder (4) and the outer wall of the piston (1).
실린더(1) 내부에 위치된 피스톤링(3)은 폭발압을 받게 되고 폭발압에 의해 피스톤링(3)은 링그로브(2)를 치게 되므로 장기간 사용시 도 2 의 우측 그림과 같이 링그로브(2)가 마모되는 현상이 발생된다.The piston ring (3) located inside the cylinder (1) is subjected to the explosion pressure and the piston ring (3) hits the ring groove (2) by the explosion pressure, so the ring glove (2) ) Is worn out.
링그로브(2)가 마모되면 피스톤링(3)에 의해 유지되던 기밀도가 낮아져 수명이 단축되는 것이었다.When the ring groove 2 is worn, the airtightness retained by the piston ring 3 is lowered, and the life is shortened.
이같이 링그로브(2)가 쉽게 마모되는 것을 방지하기 위하여 피스톤 링그로브(2)에 경질 크롬도금 또는 인덕션 하드닝(Induction hardening), 레이져 하드닝(Laser hardening)을 수행하여 경도를 높여 주고 있으나 상기 방식은 제조원가가 상승되고, 품질이 균일하게 나오지 않으며, 작업불량이 많이 발생하는 문제점이 있었다.In order to prevent wear of the ring grove 2 easily, the piston ring grove 2 is subjected to hard chromium plating, induction hardening, or laser hardening to increase hardness. The manufacturing cost is increased, the quality does not come out uniformly, there was a problem that a lot of work occurs.
본 발명은 링그로브를 고주파 가열시키면서 냉각수를 공기압으로 비산시킴으로써 증발잠열을 이용하여 균열을 방지하는 한편 높은 경도값을 얻을 수 있도록 하는 것이다.The present invention is to use a latent heat of evaporation while scattering the cooling water to the air pressure while heating the ring groves to prevent cracks and to obtain a high hardness value.
본 발명의 피스톤 링그로브 열처리 과정은 냉각형 가열코일을 피스톤 링그로브에 삽입시키는 과정과,Piston ring glove heat treatment process of the present invention is the process of inserting the cooling heating coil into the piston ring glove,
피스톤을 회전시켜 가며 가열코일로 링그로브를 가열시키는 과정과,Heating the ring grove with a heating coil while rotating the piston,
링그로브 가열부위에 냉각수를 공기압으로 비산시키는 과정을 수행시킴으로써 이루어지고,It is made by performing a process of scattering the cooling water by air pressure on the ring grove heating portion,
본 발명의 피스톤 링그로브 열처리 장치는 피스톤을 수평상태로 회전시키는 피스톤 회전수단과,Piston ring grove heat treatment apparatus of the present invention and the piston rotating means for rotating the piston in a horizontal state,
상기 피스톤의 링그로브에 삽입되어 링그로브를 고주파 가열시키는 냉각형 가열코일과,A cooling heating coil inserted into the ring groove of the piston to heat the ring groove at a high frequency;
가열된 링그로브에 냉각수를 분사시키는 냉각수 파이프와,A coolant pipe for injecting coolant into the heated ring groove,
냉각수 파이프에서 분사되는 냉각수를 공기압으로 비산시키는 에어 파이프를 구비시킴으로써 이루어 진다.It is made by providing an air pipe for dispersing the coolant injected from the coolant pipe into the air pressure.
도 1 은 피스톤 사시도1 is a piston perspective view
도 2 는 링그로브 마모상태를 보인 단면도2 is a cross-sectional view showing a ring grove wear state
도 3 은 본 발명의 열처리 장치도3 is a heat treatment apparatus of the present invention
도 4 는 본 발명의 열처리 장치 요부단면도4 is a cross-sectional view of main parts of the heat treatment apparatus of the present invention.
도 5 는 본 발명의 열처리 장치 평면도5 is a plan view of the heat treatment apparatus of the present invention
도 6 은 본 발명의 열처리 장치 정면도6 is a front view of the heat treatment apparatus of the present invention.
[도면의 주요부분에 대한 부호의 설명][Explanation of symbols on the main parts of the drawings]
1 : 피스톤 2 : 링그로브 2a : 열처리부위1: Piston 2: Ring Grove 2a: Heat Treatment Site
3 : 피스톤링 4 : 실린더 5 : 고정회전구3: piston ring 4: cylinder 5: fixed rotating hole
6 : 이동회전구 7 : 가열코일 7a : 냉각수통로6: moving rotary hole 7: heating coil 7a: cooling water passage
8,9 : 냉각수파이프 10,11 : 에어파이프8,9: cooling water pipe 10,11: air pipe
본 발명의 피스톤 링그로브 열처리 방법은 피스톤(1)의 링그로브(2)에 냉각형 고주파 가열코일(7)을 삽입시키는 과정과,Piston ring glove heat treatment method of the present invention is the process of inserting the cooling type high frequency heating coil (7) into the ring glove (2) of the piston (1),
피스톤(1)을 회전시켜 가며 가열코일(7)로 링그로브(2)를 고주파 가열시키는 과정과,Rotating the piston (1) while heating the ring groove (2) with a heating coil (7), and
링그로브(2)의 가열부위에 냉각수를 공급하되 공기압으로 냉각수를 비산시키는 과정에 의해 이루어진다.Supplying the cooling water to the heating portion of the ring groove (2) is made by the process of scattering the cooling water by air pressure.
이러한 본 발명은 열처리 되지 않은 주철제 피스톤(1)을 고정회전구(5)와 이동회전구(6) 사이에 위치시킨 상태에서 상기된 과정에 의해 링그로브(2)의 열처리가 이루어지는 것으로 열처리시키는 과정은 다음과 같다.The present invention is a process of heat-treating the heat treatment of the ring grove (2) by the above-described process in a state in which the cast iron piston (1) that is not heat-treated between the fixed rotary hole (5) and the moving rotary hole (6) Is as follows.
① 가열코일(7)을 링그로브(2)에 삽입시키는 과정.① The process of inserting the heating coil (7) into the ring grove (2).
고주파 가열코일(7)을 링그로브(2)에 삽입될 수 있는 위치로 이동시키되 상기 가열코일(7) 내부에는 냉각수 통로(7a)가 형성된다.The high frequency heating coil 7 is moved to a position that can be inserted into the ring grove 2, but a cooling water passage 7a is formed inside the heating coil 7.
이때 가열코일(7)은 링그로브(2)의 폭보다 작아야 하고 가열코일(7)은 860∼910℃까지의 발열온도를 갖추어야 한다.At this time, the heating coil (7) should be smaller than the width of the ring groove (2) and the heating coil (7) should have an exothermic temperature of 860 ~ 910 ℃.
② 고주파 가열과정.② High frequency heating process.
링그로브(2)에 가열코일(7)을 위치시킨 후에는 이동회전구(6)를 이용하여 피스톤(1)을 회전시켜 주어 링그로브(2)가 고주파 가열되게 한다.After the heating coil 7 is placed on the ring grove 2, the piston 1 is rotated using the moving rotary hole 6 so that the ring grove 2 is heated at high frequency.
이때 피스톤(1)의 회전 이송속도는 8∼13 mm/sec 가 적합하다.At this time, the rotational feed speed of the piston 1 is suitable 8 to 13 mm / sec.
③ 냉각수 비산과정.③ Coolant splashing process.
피스톤(1)을 회전시켜 가며 가열코일(7)로 링그로브(2)를 가열시키면서 냉각수 파이프(8)(9)로 링그로브(2)에 냉각수를 공급하는 동시에 에어 파이프(10)(11)로 에어를 공급하여 냉각수가 공기압에 비산되어 냉각되게 한다.While rotating the piston (1) while heating the ring grove (2) with the heating coil (7) while supplying the coolant to the ring grove (2) with the coolant pipe (8) (9), the air pipe (10) (11) The air is supplied to the cooling water so that the coolant is scattered to the air pressure and cooled.
이때 낭각수 파이프(8)(9)와 에어 파이프(10)(11)는 가열코일(7)로 가열되는 링그로브(2)를 향하게 된다.At this time, the capsular water pipes 8 and 9 and the air pipes 10 and 11 face the ring groove 2 heated by the heating coil 7.
냉각수를 비산시키기 위한 냉각수 파이프(8)(9)는 직경 2∼4 ㎜ 의 파이프를 사용하여 3∼5 ㎏/㎠ 의 압력으로 냉각수를 공급하고 에어파이프(10)(11)는 직경 2∼4 ㎜ 의 파이프를 사용하여 4∼7 ㎏/㎠ 의 압력으로 에어를 공급하도록 한다.Cooling water pipes 8 and 9 for dispersing the cooling water supply the cooling water at a pressure of 3 to 5 kg / cm 2 using pipes of 2 to 4 mm in diameter, and the air pipes 10 and 11 to 2 to 4 in diameter. An air is supplied at a pressure of 4 to 7 kg / cm 2 using a mm pipe.
그러면 도 4 와 도 6 에 도시된 바와 같이 링그로브(2)에는 경도가 높은 열처리부위(2a)가 형성되어 링그로브(2) 마모를 방지해 주게 된다.Then, as shown in FIG. 4 and FIG. 6, the heat treatment portion 2a having a high hardness is formed in the ring groove 2 to prevent the wear of the ring groove 2.
한편 가열코일(7)로 가열된 링그로브(2)를 에어로만 냉각시킬 경우 원하는 경도가 나오지 않고 또한 물로써 냉각시킬 경우는 균열이 발생하는 문제점이 있다.On the other hand, when the ring groove 2 heated by the heating coil 7 is cooled only by air, the desired hardness does not come out, and when cooling by water, there is a problem that a crack occurs.
따라서 본 발명에서는 냉각수를 공기압으로 비산시켜 냉각되게 하므로써 보통 HrC 20 정도의 주철제 피스톤 경도값을 열처리부위에서는 HrC 58∼64 의 높은 경도값을 가지며 균열이 발생되지 않게 된다.Therefore, in the present invention, by cooling the cooling water by air pressure to cool the cast iron piston hardness value of about HrC 20 usually has a high hardness value of HrC 58 to 64 at the heat treatment site and no cracking occurs.
본 발명의 피스톤 링그로브(2) 열처리 장치는 피스톤(1)을 수평상태로 끼워 회전시키는 고정회전구(5) 및 이동회전구(6)와,Piston ring groove (2) heat treatment device of the present invention is a fixed rotary hole (5) and the moving rotary hole (6) for rotating the piston (1) in a horizontal state,
피스톤(1)의 링그로브(2)에 삽입되어 링그로브(2)를 고주파가열시키는 냉각형 가열코일(7)과,A cooling heating coil (7) inserted into the ring groove (2) of the piston (1) for heating the ring groove (2) by high frequency;
가열된 링그로브(2)에 냉각수를 분사시키는 냉각수 파이프(8)(9)와,A coolant pipe (8) (9) for injecting coolant into the heated ring groove (2),
냉각수 파이프(8)(9)에서 분사된 냉각수를 공기압으로 비산시키는 에어파이프(10)(11)로 구성된다.It consists of air pipes 10 and 11 which scatter the cooling water injected from the cooling water pipes 8 and 9 to air pressure.
피스톤(1)은 이동회전구(6)를 이동시켜 고정회전구(5)와 이동회전구(6) 사이에 수평상태로 놓이게한 후 상기 피스톤(1)을 회전시켜야 한다.The piston (1) is to move the moving rotor (6) to be placed horizontally between the fixed rotor (5) and the moving rotor (6) to rotate the piston (1).
피스톤(1)의 수평상태 고정 및 피스톤(1) 회전방식은 공지된 기술의 응용이다.The horizontal fixation of the piston 1 and the method of rotating the piston 1 are applications of known techniques.
여기서 피스톤(1)의 회전 이송 열처리속도는 8∼13 ㎜/sec 를 유지하여야 하고 내부에 냉각수 통로(7a)가 형성된 가열코일(7)의 가열온도는 860∼910℃ 정도가 되어야 한다.Here, the rotational feed heat treatment rate of the piston 1 should be maintained at 8 to 13 mm / sec, and the heating temperature of the heating coil 7 having the cooling water passage 7a formed therein should be about 860 to 910 ° C.
그리고 가열코일(7)은 링그로브(2)의 폭보다 좁아 링그로브(2)에 삽입될 수 있어야 한다.The heating coil 7 should be narrower than the width of the ring grove 2 so that the heating coil 7 can be inserted into the ring grove 2.
가열코일(7)이 가열되고 피스톤(1)이 회전되면 링그로브(2)가 가열되며 이때 링그로브(2)의 가열부위는 냉각수를 비산시켜 냉각시키게 된다.When the heating coil 7 is heated and the piston 1 is rotated, the ring grove 2 is heated. At this time, the heating portion of the ring grove 2 is cooled by scattering cooling water.
냉각수 비산장치는 냉각수를 링그로브(2) 가열부위에 분사시키는 냉각수 파이프(8)(9)와, 분사되는 냉각수를 비산시키는 에어 파이프(10)(11)로 이루어지며 상기 냉각수 파이프(8)(9)는 직경 2∼4 ㎜ 에 3∼5 ㎏/㎠ 의 압력으로 냉각수를 분사시키게 되고 에어 파이프(10)(11)는 직경 2∼4 ㎜ 에 4∼7 ㎏/㎠ 의 압력으로 공기를 분사시키게 된다.Cooling water scattering device is composed of a cooling water pipe (8) (9) for injecting the cooling water to the heating portion of the ring grove (2), and air pipes (10) (11) for scattering the cooling water to be injected into the cooling water pipe (8) ( 9) sprays cooling water at a pressure of 3 to 5 kg / cm 2 at a diameter of 2 to 4 mm and air pipes 10 and 11 at a pressure of 4 to 7 kg / cm 2 at a diameter of 2 to 4 mm. Let's go.
따라서 링그로브(2)의 가열부위는 비산되는 냉각수에 의해 냉각되므로 균열없이 HrC 58∼64 의 높은 경도값을 갖는 열처리 부위(2a)를 형성시키게 된다.Therefore, since the heating portion of the ring groove 2 is cooled by scattered cooling water, the heat treatment portion 2a having a high hardness value of HrC 58 to 64 is formed without cracking.
상술한 바와 같은 본 발명은 피스톤의 링그로브를 가열코일로 가열시키면서 냉각수를 비산시켜 냉각처리하는 것이므로, 균열이 발생되지 않고 높은 경도값을 갖게 되어 피스톤의 수명을 연장시키고 엔진 출력을 높일 수 있는 효과가 있는 것이다.As described above, the present invention is to cool the liquid by scattering the cooling water while heating the ring groove of the piston with a heating coil, so that cracks do not occur and have a high hardness value, thereby extending the life of the piston and increasing the engine output. There is.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980026532A KR100273466B1 (en) | 1998-06-26 | 1998-06-26 | Piston-ring-groove heat treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980026532A KR100273466B1 (en) | 1998-06-26 | 1998-06-26 | Piston-ring-groove heat treatment system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20000004819A KR20000004819A (en) | 2000-01-25 |
| KR100273466B1 true KR100273466B1 (en) | 2000-12-15 |
Family
ID=19542791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019980026532A KR100273466B1 (en) | 1998-06-26 | 1998-06-26 | Piston-ring-groove heat treatment system |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR100273466B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100603504B1 (en) * | 2005-12-09 | 2006-07-20 | 에스티엑스엔파코 주식회사 | Method of thermal treatment for piston ring groove |
| KR100781188B1 (en) * | 2006-06-23 | 2007-11-30 | 삼영기계(주) | Heating processing method for surface of piston ring and a piston ring |
| KR200447872Y1 (en) * | 2007-12-05 | 2010-02-26 | 에스티엑스엔파코 주식회사 | Thermal treatment apparatus of piston ring grooves |
| KR102267020B1 (en) | 2019-09-09 | 2021-06-17 | 김성규 | Methods for manufacturing pistons with increased wear resistance and insulation and Piston by this manufacturing method |
-
1998
- 1998-06-26 KR KR1019980026532A patent/KR100273466B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR20000004819A (en) | 2000-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101760603A (en) | Manufacture method of composite milling roller with good roller surface rigidity uniformity | |
| CN202030786U (en) | Sensor for simultaneous quenching of multiple positions of crankshaft | |
| KR100273466B1 (en) | Piston-ring-groove heat treatment system | |
| CN105087886A (en) | Method for producing rotary air conditioner compressor blades | |
| CN103602797A (en) | High-hardness steel cut wire shot heat treatment technology | |
| CN100434544C (en) | Method for preventing end-face spray quenching cracking of quenching piece by changing spray angle | |
| CN100532585C (en) | Surface hardening treatment method for large-power low-speed diesel engine piston bar | |
| CN105779704A (en) | Heat treatment process for 45 steel crankshaft | |
| KR100781188B1 (en) | Heating processing method for surface of piston ring and a piston ring | |
| CN201154974Y (en) | Apparatus for rapidly and uniformly cooling roller | |
| JP2005002445A (en) | Heat treatment method for member made of spheroidal graphite cast iron | |
| US2124459A (en) | Method of heat treating metals | |
| RU2140997C1 (en) | Method of thermal treatment of railway wheels | |
| ES2145595T3 (en) | PROCEDURE TO MANUFACTURE CASTING PARTS. | |
| CN206289276U (en) | A kind of internal spline machining tool and system of processing | |
| JPH0418012B2 (en) | ||
| JPH074303A (en) | Cylinder for engine and thermal refining method of inner face of cylinder | |
| US2303467A (en) | Heat treatment of metal articles having holes therein | |
| JPH1161264A (en) | Crawler bush and its manufacture | |
| RU2455141C2 (en) | Method of reconditioning large-size nitride-hardened crankshaft scored hollow journals by high-frequency current | |
| JPH0819469B2 (en) | Heat treatment method for cylindrical wear resistant parts | |
| CN104073813A (en) | Thermal treatment process of piston of rock drill made of 35CrMoV steel | |
| JPH0679541A (en) | Method for forming torque transmitting shaft for induction hardening | |
| CN213866313U (en) | Turbine shaft processing is with temperature measurement guenching unit that has anti-puncture structure | |
| JP2001132587A (en) | Fuel injection nozzle and its manufacturing method |
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 | ||
| FPAY | Annual fee payment |
Payment date: 20120903 Year of fee payment: 13 |
|
| FPAY | Annual fee payment |
Payment date: 20130902 Year of fee payment: 14 |
|
| FPAY | Annual fee payment |
Payment date: 20140903 Year of fee payment: 15 |
|
| FPAY | Annual fee payment |
Payment date: 20150729 Year of fee payment: 16 |
|
| EXPY | Expiration of term |