CN102534354B - Alloy gray cast iron piston ring as well as manufacturing method and special template thereof - Google Patents
Alloy gray cast iron piston ring as well as manufacturing method and special template thereof Download PDFInfo
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- CN102534354B CN102534354B CN 201110441433 CN201110441433A CN102534354B CN 102534354 B CN102534354 B CN 102534354B CN 201110441433 CN201110441433 CN 201110441433 CN 201110441433 A CN201110441433 A CN 201110441433A CN 102534354 B CN102534354 B CN 102534354B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 17
- 239000000956 alloy Substances 0.000 title claims abstract description 17
- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000005266 casting Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 32
- 239000006004 Quartz sand Substances 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000002667 nucleating agent Substances 0.000 claims description 8
- MIDOFQRPAXDZET-UHFFFAOYSA-N [Si].[Sr] Chemical compound [Si].[Sr] MIDOFQRPAXDZET-UHFFFAOYSA-N 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000003110 molding sand Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 229910000805 Pig iron Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 abstract 2
- 238000010791 quenching Methods 0.000 abstract 1
- 230000000171 quenching effect Effects 0.000 abstract 1
- 238000005496 tempering Methods 0.000 abstract 1
- 239000003607 modifier Substances 0.000 description 10
- 239000010439 graphite Substances 0.000 description 9
- 229910002804 graphite Inorganic materials 0.000 description 9
- 238000005452 bending Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- VAKIVKMUBMZANL-UHFFFAOYSA-N iron phosphide Chemical compound P.[Fe].[Fe].[Fe] VAKIVKMUBMZANL-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses an alloy gray cast iron piston ring and a manufacturing method and a special template thereof. The material of the piston ring comprises the following elements in percentage by weight: 3.2-3.5% of C, 2.3-2.6% of Si, 0.70-0.9% of Mn, 0.1-0.30% of P, 0.1-0.3% of Cr, 0.4-0.5% of Mo, 0.6-1.0% of Cu, 0.3-0.5% of Ni, not more than 0.1% of S and the balance of Fe. The piston ringis manufactured by the steps of: shaping, smelting, incubating, taking out and casting. The template adopted by the shaping process comprises a bottom plate, a lateral runner and a straight runner arranged at the middle position of the lateral runner, wherein first mold rings are symmetrically arranged at each of two ends of the lateral runner; first internal runners for communicating the first mold rings with the lateral runner are vertical to the lateral runner; and second mold rings are respectively arranged between two first mold rings at each of two sides of the straight runner. According to the invention, the casting capability of the piston ring is increased, the piston ring with higher elastic modulus can be obtained without quenching and tempering treatment, the requirement of anengine on high specific pressure of the piston ring is satisfied and the engine emission is reduced.
Description
Technical field
The present invention relates to a kind of alloy gray cast-iron piston ring, relate in particular to a kind of alloy gray cast-iron piston ring and manufacture method thereof that adopts novel material, on its application with internal combustion engines.
Background technology
Oil engine is a kind of power machine, and it is by fuel is burnt at machine intimate, and its heat energy of emitting directly is converted to the Thermal Motor of power.Oil engine is a kind of broad-spectrum mechanical means, wherein piston ring is one of component the most key in the I. C. engine, and it has three effects greatly in diesel motor, and it is with combustion chamber and crankcase seals, heat energy on the piston is passed on the cylinder wall, and control its oil consumption.The working conditions of piston ring is quite abominable, should bear the effect of high temperature, high pressure, bears violent wearing and tearing and bigger impact load effect again.For reliability and the weather resistance that improves work, piston ring material has been proposed high requirement, be that piston ring must have good wear resistance, necessary strength and enough elasticity and elasticity retentivities, be specially hardness: 100～110HRB, bending strength: 〉=500N/mm
2MPa, Young's modulus: 110000～150000 N/mm
2, thermostability: 〉=92%.
At present, the material of piston ring is generally the cast alloy iron of high elastic coefficient and bending strength, and it generally all needs to obtain the technology more complicated through modifier treatment.Because Young's modulus and the bending strength of the alloy gray cast-iron that present stage employing sand mold casting is produced are all lower, Young's modulus is 70000-100000MPa, bending strength is 390-500 MPa, could improve its Young's modulus, bending strength because need through modifier treatment.
Summary of the invention
The alloy gray cast-iron piston ring that the technical problem to be solved in the present invention provides a kind of good mechanical property and do not need can use through modifier treatment, and production method and the dedicated templates thereof of this piston ring are provided.
For solving the problems of the technologies described above, the technical scheme that piston ring of the present invention is taked is: the weight percentage of each element is as follows in this piston ring material: C 3.2～3.5%, Si 2.3～2.6%, and Mn 0.70～0.9%, and P 0.1～0.30%, Cr 0.1～0.3%, Mo 0.4～0.5%, and Cu 0.6～1.0%, and Ni 0.3～0.5%, S≤0.1%, surplus are Fe.
The present invention makes the technical scheme that above-mentioned piston ring takes and specifically may further comprise the steps:
A. moulding;
B. prepare burden by above-mentioned each component element, add melting in the smelting furnace then, molten iron is superheated to 1525～1540 ℃;
C. leave standstill to 1510～1520 ℃ and come out of the stove, add silicon strontium nucleating agent before coming out of the stove and breed, the granularity of silicon strontium nucleating agent is 1～3 ㎜, and add-on is 0.4～0.6% of weight of molten iron;
D. cast, teeming temperature is 1380～1440 ℃, casting process was finished in 3 minutes.
When batching is except C, Si among the above-mentioned operation b, all the other elements are all by following chemical components in percentage by weight preparation behind the stove, the weight percentage control of C element in stove the time is 3.3～3.6%, be adjusted to more than 3.3% when its weight percentage adds carbon dust less than 3.3% the time, be adjusted to below 3.6% when its weight percentage adds steel scrap greater than 3.6% the time; The weight percentage control of Si element in stove the time is 2.1～2.3%, when its weight percentage is added silicon metal or 75 ferrosilicon less than 2.1% the time in stove, make Si content greater than 2.1%, in stove, add the Q10 pig iron or steel scrap when its weight percentage greater than 2.3% the time, make Si content less than 2.3%.
The molding sand that adopts during moulding among the above-mentioned operation a is quartz sand and bentonitic mixture, wherein quartz sand and wilkinite proportioning: when quartz sand adopts old sand, the wilkinite volumn concentration is 1～3%, when quartz sand adopts fresh sand, the wilkinite volumn concentration is 15～20%, when quartz sand is the mixture of old sand and Xin Sha, the every increase by 10% of fresh sand, bentonitic volumn concentration increases by 1.5～2%; The green compression strength of molding sand is 1.2-1.6Kg/cm
2, compact rate of molding is 25-40%, ventilation property 〉=50, and water content is 3-4%, silt content≤15%, effectively bentonite content 〉=8%.
The SiO of above-mentioned quartz sand
2Content 〉=98%, granularity 75-150 order, refractoriness 〉=1700 ℃, silt content≤1%; Wilkinite granularity requirements 95% is crossed 200 mesh sieves, inhales per 100 grams of blue amount greater than 30 grams.
The present invention also provides the template of cast usefulness among the above-mentioned steps c, and its concrete structure is: the sprue that comprises base plate, is located at the cross gate on the base plate and is located at the connection cross gate in cross gate mid-way; The two ends of described cross gate are arranged with four first model loops, and two first model loops of the same end of cross gate are symmetricly set in the cross gate both sides, and it is vertical with cross gate with first ingate of cross gate to be communicated with each first model loop; Between two first model loops of the both sides of described sprue, second model loop is set respectively, the acute angle that is communicated with the angle of second ingate between second model loop and the cross gate and cross gate is 54 °, and two second model loops and second ingate are symmetrical arranged about the symmetry centre of cross gate relatively.
The beneficial effect that adopts technique scheme to produce is:
(1) the present invention adjusts the concrete component of piston ring, and its production technique improved, significantly improved the casting ability of alloy gray cast-iron piston ring, and can obtain the higher piston ring of high elastic coefficient without modifier treatment, satisfied the requirement of high-performance enginer to the big specific pressure of piston ring, reduce the discharging of engine, and can save machine oil.
(2) on production technique owing to saved modified operation, shortened work flow, and then improved efficiency, reduced manufacturing cost.
The template construct gating system that adopts moulding of the present invention to use when (3) pouring into a mould, such gating system layout can improve die cavity intensity, guarantee the molten iron filling velocity, are conducive to molten iron and rationally fill type, reduce casting flaw, improve blank quality.
Description of drawings
Fig. 1 is the synoptic diagram of cast template among the present invention;
Fig. 2 is one graphite of Φ FZ9842-100X metallograph among the present invention;
Fig. 3 is one matrix of φ FZ9842-500X metallograph among the present invention;
Wherein, 1, sprue; 2, cross gate; 3-1 is first ingate, and 3-2 is second ingate; 4, first model loop; 5, base plate; 6, second model loop.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The material of present embodiment alloy gray cast-iron piston ring is selected appropriate C, Si, and Mn, P, Cr, Mo, Cu, Ni, the weight percentage of components such as S, the concrete content of each composition is referring to table 2, and surplus is Fe.
The manufacture method of present embodiment alloy gray cast-iron piston ring comprises the steps:
A. moulding: molding sand is quartz sand and bentonitic mixture, both proportionings see Table 1, when quartz sand adopts old sand, the wilkinite volumn concentration is 1～3%, when quartz sand adopted fresh sand, the wilkinite volumn concentration was 15～20%, when quartz sand is the mixture of old sand and Xin Sha, the every increase by 10% of fresh sand, bentonitic volumn concentration increases by 1.5～2%.Wherein specific requirement is: the 1) SiO of quartz sand
2Content 〉=98%, granularity 75-150 order, refractoriness 〉=1700 ℃, silt content≤1%; 2) wilkinite: granularity requirements 95% is crossed 200 mesh sieves, inhales per 100 grams of blue amount greater than 30 grams.
Moulding-sand property requires: green compression strength 1.2～1.6Kg/cm2, compact rate of molding 25-40%, ventilation property 〉=50, water content 3-4%, silt content≤15%, effectively bentonite content 〉=8%.
B. said ratio is suitable starting material add melting in the smelting furnace, and are superheated to 1525～1540 ℃, in order to improve the purity of molten iron, superheating temperature generally is higher than 15-20 ℃ of molten iron tapping temperature.Wherein, in the above-mentioned each component except C, Si, all the other elements are all by following chemical components in percentage by weight control behind the stove, and the weight percentage control of C element molten iron in stove is considered 0.1% scaling loss amount at 3.3～3.6%(): added carbon dust less than 3.3% o'clock and be adjusted to more than 3.3%; Adding steel scrap greater than 3.6% o'clock is adjusted to below 3.6%.The weight percentage control of Si element in stove is 2.1～2.3%, when in stove, adding silicon metal or 75 ferrosilicon less than 2.1% the time, make Si content greater than 2.1%, when adding the Q10 pig iron or steel scrap (must preheating) greater than 2.3% the time in the stove, make Si content less than 2.3%.
C. above-mentioned molten iron is left standstill, treat that it is cooled to 1510～1520 ℃ and comes out of the stove, add silicon strontium nucleating agent before coming out of the stove and breed, add-on is 0.4～0.6% of weight of molten iron, the granularity of silicon strontium nucleating agent is 1～3 ㎜, fully absorbs for making nucleating agent, adds the fashionable current-following inoculation of wanting.Because piston ring is the thin-walled light casting, under the lower situation of carbon silicone content, is easy to generate carbide, for effectively eliminating carbide, so select the silicon strontium to make nucleating agent.
D. cast: after breeding, move casting ladle to place sand mold station and pour into a mould, teeming temperature is 1380～1440 ℃, and for keeping pregnant effect, the molten iron after breeding must water in 3 minutes.
Need during cast reasonably to select pouring technology, and come the design template placement position according to model loop section modulus (section modulus=cross-sectional area/section girth), molten iron cavity filling ability, the characteristics of solidifying, molten iron rationally fills type when guaranteeing cast.Referring to accompanying drawing 1, one template of this FZ9842 is provided with a base plate 5, be provided with runner system above the base plate 5, it comprises cross gate 2, the first ingate 3-1, the second ingate 3-2 and at the endways sprue 1 that is communicated with cross gate 2 that upwards arranges of the medium position of cross gate 2; The first ingate 3-1 arranges 4 altogether, respectively be symmetrical arranged two at the two ends, the left and right sides of cross gate 2, two first ingate 3-1 that are positioned at cross gate 2 same ends are symmetrical arranged about cross gate 2, each first ingate 3-1 and cross gate 2 vertical settings all arrange first model loop 4 in the flow field end of each first ingate 3-1; In the both sides of sprue 1 and between two first model loops 4, respectively be provided with the second ingate 3-2 of an inclination, two ingate 3-2 arrange about the symmetry centre centrosymmetry of cross gate 2, folded acute angle is 54 ° between ingate 3-2 and the cross gate 2, and the end of each second ingate 3-2 is equipped with second model loop 6; The length of the second ingate 3-2 is longer than the length of the first ingate 3-1.
The mechanical property of this piston ring that employing above-mentioned materials and method are produced is (referring to table 2): hardness is 104HRB, and bending strength is 554/mm
2MPa, Young's modulus are 152516.5 N/mm
2, thermostability is 96%.It can satisfy the service requirements of piston ring fully.
In order to satisfy service requirements, require as follows to the metallographic structure of alloy gray cast-iron piston ring:
1) graphite: the tiny sheet A type graphite+point-like D type graphite that evenly distributes, allow E type graphite, E type graphite is not more than 10% of visual field area;
2) matrix: for fine pearlite, allowed acicular structure, free carbide, ferrite≤5%;
3) iron phosphide eutectic: should be single tiny bulk or be interrupted netted even distribution.
Above-described embodiment piston ring is carried out metallographic detect, referring to accompanying drawing 2 and accompanying drawing 3, graphite is strip A type graphite+a small amount of D type graphite in its metallographic structure as can be known, and matrix is fine pearlite+acicular structure, satisfies relevant service requirements fully.And do not find bulk or continuous net-shaped iron phosphide eutectic.
The weight percentage of each component is referring to table 2 among these embodiment, and its production method and technology are identical with above-described embodiment 1.These embodiment mechanical performance of products are referring to table 3.
Prove by above-described embodiment and production test in batches, adopt the foundry machinery performance of the alloy gray cast-iron piston ring of this novel material and new producing and manufacturing technique manufacturing to be greatly improved, the blank that casting finishes has just reached the former performance requriements that needs modifier treatment to realize without modifier treatment.Not only shorten work flow, improved efficiency, also reduced manufacturing cost.As producing the piston ring that other material needs modifier treatment, every modifier treatment FZ9842 100,000 agreements that contracts a film or TV play to an actor or actress together needs 14330 degree electricity, about 7165 yuan of power cost.Produce this kind material piston ring, without modifier treatment, but about 7165 yuan of per 100,000 conservation of power costs.100,000 FZ9842 of original production (casting+modifier treatment) are ring together, needs 195 hours altogether, and existing (casting) 100,000 this kind blanks of producing need 55 hours, and artificial labor is imitated and improved: (195-55)/and 195=71.8%.
Quartz sand and bentonitic proportioning (volumn concentration) in table 1 molding sand
The chemical ingredients of each embodiment of table 2 (weight percentage)
The mechanical property of each embodiment of table 3
Claims (5)
1. the manufacture method of an alloy gray cast-iron piston ring, it is characterized in that: the weight percentage of this each element of piston ring material is as follows: C3.2～3.5%, Si2.3～2.6%, Mn0.70～0.9%, P0.1～0.30%, Cr0.1～0.3%, Mo0.4～0.5%, Cu0.6～1.0%, Ni0.3～0.5%, S≤0.1%, surplus are Fe;
Manufacture method comprises following operation:
A. moulding;
B. prepare burden by above-mentioned each component, add melting in the smelting furnace then, molten iron is superheated to 1525～1540 ℃;
C. leave standstill to 1510～1520 ℃ and come out of the stove, add silicon strontium nucleating agent before coming out of the stove and breed, the granularity of silicon strontium nucleating agent is 1～3 ㎜, and add-on is 0.4～0.6% of weight of molten iron;
D. cast, teeming temperature is 1380～1440 ℃, casting process was finished in 3 minutes.
2. the manufacture method of alloy gray cast-iron piston ring according to claim 1, it is characterized in that: when batching is except C, Si among the described operation b, all the other elements are all by following chemical components in percentage by weight preparation behind the stove, the weight percentage control of C element in stove the time is 3.3～3.6%, be adjusted to more than 3.3% when its weight percentage adds carbon dust less than 3.3% the time, be adjusted to below 3.6% when its weight percentage adds steel scrap greater than 3.6% the time; The weight percentage control of Si element in stove the time is 2.1～2.3%, when its weight percentage is added silicon metal or 75 ferrosilicon less than 2.1% the time in stove, make Si content greater than 2.1%, in stove, add the Q10 pig iron or steel scrap when its weight percentage greater than 2.3% the time, make Si content less than 2.3%.
3. the manufacture method of alloy gray cast-iron piston ring according to claim 1, it is characterized in that: the molding sand that adopts during moulding among the described operation a is quartz sand and bentonitic mixture, wherein the volumn concentration of quartz sand in mixture is as follows: when quartz sand adopts old sand, the wilkinite volumn concentration is 1～3%, when quartz sand adopts fresh sand, the wilkinite volumn concentration is 15～20%, when quartz sand is the mixture of old sand and Xin Sha, the every increase by 10% of fresh sand, bentonitic volumn concentration increases by 1.5～2%; The green compression strength of molding sand is 1.2-1.6Kg/cm
2, compact rate of molding is 25-40%, ventilation property 〉=50, and water content is 3-4%, silt content≤15%, effectively bentonite content 〉=8%.
4. the manufacture method of alloy gray cast-iron piston ring according to claim 3 is characterized in that: the SiO of described quartz sand
2Content 〉=98%, granularity 75-150 order, refractoriness 〉=1700 ℃, silt content≤1%; Wilkinite granularity requirements 95% is crossed 200 mesh sieves, inhales per 100 grams of blue amount greater than 30 grams.
5. the template that moulding is used among the step a of claim 1 is characterized in that: the sprue (1) that described template comprises base plate (5), is located at the cross gate (2) on the base plate (5) and is located at the connection cross gate (2) in cross gate (2) mid-way; The two ends of described cross gate (2) are arranged with four first model loops (4), two first model loops (4) of the same end of cross gate (2) are symmetricly set in cross gate (2) both sides, and it is vertical with cross gate (2) with first ingate (3-1) of cross gate (2) to be communicated with each first model loop (4); Between two first model loops (4) of the both sides of described sprue (1), second model loop (6) is set respectively, be communicated with second ingate (3-2) and cross gate (2) between second model loop (6) and the cross gate (2) angle be 54 °, two second model loops (6) and second ingate (3-2) are symmetrical arranged about the symmetry centre of cross gate (2).
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| CN103668333B (en) * | 2012-08-31 | 2016-04-13 | 沈阳铝镁设计研究院有限公司 | Aluminium anode assembling low-phosphorous low-sulfur gray pig iron formula and production method |
| CN109694981A (en) * | 2019-01-07 | 2019-04-30 | 陕西柴油机重工有限公司 | Full A type graphite material of high-power diesel engine body and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB484930A (en) * | 1936-11-19 | 1938-05-12 | William Arthur Oubridge | Improvements in and connected with the casting of piston and like metal packing rings |
| US5972128A (en) * | 1996-02-28 | 1999-10-26 | Kabushiki Kaisha Riken | Cast iron and piston ring |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004092714A (en) * | 2002-08-30 | 2004-03-25 | Nippon Piston Ring Co Ltd | Combination of piston and piston ring |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB484930A (en) * | 1936-11-19 | 1938-05-12 | William Arthur Oubridge | Improvements in and connected with the casting of piston and like metal packing rings |
| US5972128A (en) * | 1996-02-28 | 1999-10-26 | Kabushiki Kaisha Riken | Cast iron and piston ring |
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