CN1880748A - Piston of high power diesel engine and method for fabricating same - Google Patents
Piston of high power diesel engine and method for fabricating same Download PDFInfo
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- CN1880748A CN1880748A CN 200510096472 CN200510096472A CN1880748A CN 1880748 A CN1880748 A CN 1880748A CN 200510096472 CN200510096472 CN 200510096472 CN 200510096472 A CN200510096472 A CN 200510096472A CN 1880748 A CN1880748 A CN 1880748A
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Abstract
The invention relates to a high-power diesel piston and relative production. Based on the former structure, the first annular grove and the inner cold oil tube are positioned differently, and the inner cold oil tube is designed into different shape, to reduce the working temperature and waste gas pressure at the head of piston, to improve the power of engine, reduce cost and improve yield. The invention also provides a relative metal gravity integrated casting or compression method, to improve the working power and reliability. The inventive piston alloy can be made from aluminum alloy and aluminum composite.
Description
Technical field
The present invention relates to piston of high power diesel engine and preparation method thereof, relate generally to the piston of high power diesel engine in cold oil road in the band edge circle and preparation method thereof.
Background technique
The actual operating conditions of high power engine piston has different requirements to piston skirt and head, piston crown links to each other with the firing chamber, its operating temperature is more than 350 ℃, and the piston skirt is owing to there is the cooling of free G﹠O, about 150 ℃ of operating temperatures, the operating temperature of piston each several part as shown in Figure 1.Since the operating temperature difference, the volumetric expansion difference of material when work, just quite strict to the performance requirement and the structure of piston requirement of material.High-power piston adopts casting with fore head, and forging forming is adopted in the skirt section, with electron beam welding two-part is connected, and this technology is made piston, and not only the reject rate of product is very high, and influences the working power and the reliability of piston.
Existing piston of high power diesel engine structure because too high, the interior cold oil of first annular groove road is too low, has therefore weakened the cooling action of oil to piston head.The cylinder prepareding gap of piston molded lines too big, piston is unfavorable for that piston at high temperature turns round in addition, thereby increases exhaust gas pressure, the reduction engine power of motor.
The literature search discovery, a lot of about the document of diesel engine piston both at home and abroad, but do not appear in the newspapers as yet about the piston of high power diesel engine structural design and the technique for integral casting in the interior cold oil road of band edge circle.Li Fengyi and Li Zhilin have delivered " development of cast iron/aluminium alloy compound castingin piston " literary composition in " casting " 1999 the 6th phases, this article has been reported the technique for integral casting of band ring-mounted piston, the piston of this article report belongs to general diesel engine piston, its piston diameter is less than 120mm, and there is not interior cold oil road in the piston, uncorrelated with piston of the present invention; Number of patent application is 200310120801.3 to have reported " a kind of engine piston alumina-base material ", and this patent mainly is the research at piston material, and is uncorrelated with novel piston structure of the present invention; Sun Haiting has delivered " the POWDER METALLURGY ALUMINIUM ALLOYS piston of hot strength and high abrasion resistance " literary composition in " compact internal combustion engine " 1998 the 05th phases, the material of reporting in this article all adopts the high powder metallurgy forming of cost, and is uncorrelated with piston in metal mold technique for integral casting of the present invention; The invention people is that people's such as Li Bingzhe, Wang Ruyao Chinese patent 85108934 has disclosed " a kind of Al-Si-Cu-Mg-La-Ti alloy for piston ", and this patent mainly is the research at piston material, and is uncorrelated with novel piston structure of the present invention and technique for integral casting thereof.
Through in existing information system and network, retrieving, still find no the bibliographical information identical with the present invention.
Summary of the invention
The present invention is in conjunction with the concrete operating conditions design structure of piston and the production technology of piston, its objective is the power of reduction piston crown operating temperature and exhaust gas pressure, raising motor, reduce manufacture cost simultaneously, improve the yield rate of piston, the needed piston of high-power diesel engine (power 600-2000 horsepower) is satisfied in preparation.
Realization of the present invention is at piston of high power diesel engine, cold oil road in the band edge circle, power is position, position, interior cold oil road and the shape that changes first annular groove of piston on the basis of existing high-power piston structure of 600-2000 horsepower, the position of first annular groove: the distance apart from piston head 1 end face is 20.7～23.5mm ± 0.15mm, sees Fig. 2.The position, interior cold oil road of piston: the distance apart from piston base 4 bottom surfaces is 107.6～113.2mm, and interior cold oil road is an annular, and its section shape is like egg type or round rectangle, sees Fig. 2 and Fig. 4.
The change of this structure can reduce by the first annular groove position, the interior position, cold oil road that raises, and strengthens the cooling action of oil to piston head, reduces the temperature and the heat load of piston head.
Realization of the present invention also is the piston cylinder prepareding gap of piston of high power diesel engine: 0.022～0.016mm; The molded lines of piston: the oval amount of first annular groove fades to 0.05mm by 0.09mm; The oval amount of second annular groove fades to 0.11mm by 0.16mm; The 3rd annular groove is just round section; The skirt section fades to oval section.
The change that the change of this structure can reduce cylinder prepareding gap, the piston molded line of piston helps piston at high temperature turns round, thus reduce motor exhaust gas pressure, reduce engine power.
Realization of the present invention also is the preparation method of piston of high power diesel engine, it is characterized in that: adopt the cast inblock once-through, comprise whole gravity casting and extrusion casint.
This preparation method can once-through, and cast inblock needn't the sub-unit manufacturing, and the electron beam welding moulding improves the yield rate of product, improves the working power and the reliability of piston.
Realization of the present invention also is the preparation method of piston of high power diesel engine, is the whole gravity casting method of metal mold, and concrete manufacturing step is:
1). molten aluminium piston alloy or the aluminum matrix composite liquid of joining, refinement and denaturation are handled the back 760 ℃ of insulations 30 minutes, prepare cast.
2). the preheating metal mold, the internal mold preheating temperature is controlled at 300 ℃, the outer mold preheating temperature is controlled at 250 ℃
3). the removing surface of cast iron edge circle is clean, in temperature 710～780 ℃ aluminium liquid infiltration 5～40 minutes;
4). assembling metal type dies, the structure of this mould will be inlayed earlier and enclose the internal mold of packing into piston structure of the present invention, then press the assembling of Piston mould erection drawing, see Fig. 3;
5). with preheating temperature is that 300 ℃ interior cold oil road core is put into casting mold
6). cast, 760 ℃ of pouring temperatures, the demoulding in 5 minutes.
Realization of the present invention also is the extrusion casting method into piston of high power diesel engine, and concrete manufacturing step is:
1). molten aluminium piston alloy or the aluminum matrix composite liquid of joining, after handling, refinement and denaturation, prepares cast 760 ℃ of insulations 30 minutes;
2). the preheating metal mold, the internal mold preheating temperature is controlled at 300 ℃, the outer mold preheating temperature is controlled at 250 ℃;
3). the removing surface of cast iron edge circle is clean, in temperature 710～780 ℃ aluminium liquid infiltration 5～40 minutes;
4). the assembling metal type dies, will inlay earlier and enclose the internal mold of packing into, then press the assembling of Piston mould erection drawing;
5). with preheating temperature is that cold oil road core is put into casting mold in 300 ℃;
6). cast, 760 ℃ of pouring temperatures, nip pressure 80MPa keeps taking out after 40 seconds.
Realization of the present invention also is piston of high power diesel engine, it is characterized in that: used piston material can be aluminum alloy or aluminum matrix composite.
The present invention is in conjunction with the structure and the moulding process of the concrete operating conditions designing high-power engine piston of piston, to cold oil road in the band edge circle, power is that the existing high-power structure of piston of 600-2000 horsepower is improved, i.e. the change of the position of first annular groove of piston, position, interior cold oil road and shape, piston cylinder prepareding gap and molded lines.And whole gravity casting and extrusion casting method once-through have been adopted.It is too low to have solved too high, the interior cold oil of existing piston first annular groove road, and the cylinder prepareding gap of piston molded lines too big, piston is unfavorable for that piston at high temperature turns round, thus increase motor exhaust gas pressure, reduce the problem of engine power.A kind of structure optimization is provided, can effectively improve the piston of high power diesel engine of the heat resistanceheat resistant performance of piston head, the operating temperature that reduces piston head, reduction exhaust gas pressure, the technique for integral casting of this piston of high power diesel engine is provided simultaneously, can reduce the manufacture cost of piston effectively, improve the power of yield rate and motor.
Description of drawings
Fig. 1: the operating temperature schematic representation of piston different parts in the prior art;
Fig. 2: the position view of piston ring carrier of the present invention, the first annular groove position and interior cold oil road core;
Fig. 3: piston cast inblock mould erection drawing of the present invention;
Fig. 4-1: one of interior cold oil road section shape of piston of the present invention dimensioned drawing;
Fig. 4-2: two dimensioned drawings of the interior cold oil road section shape of piston of the present invention.
Embodiment
Embodiment one: referring to Fig. 2, power is 800 horsepowers, the piston in cold oil road in the band edge circle, and the position of its first annular groove 2 is 20.7mm ± 0.15mm apart from the distance of piston head 1 end face; 3 positions, interior cold oil road of piston are 107.6mm apart from the distance of piston base 4 bottom surfaces, and interior cold oil road 3 is an annular, and its section shape is that its size is seen Fig. 4-1 like egg type.Piston material is an aluminum alloy, and the preparation method of piston is with claim 4.With compare with the diesel engine piston of power usually, the operating temperature that this piston has a piston head reduce and heat load low, engine exhaust pressure is little, satisfies the requirement of high-power diesel engine (800 horsepowers of power) to piston.
Embodiment two: structure of piston size, material and preparation method are all with embodiment one, and the molded lines of piston: the oval amount of first annular groove fades to 0.05mm by 0.09mm; The oval amount of second annular groove fades to 0.11mm by 0.16mm; The 3rd annular groove is just round section; The skirt section fades to oval section.The cylinder prepareding gap 0.022mm of piston.
Embodiment three: referring to Fig. 2 power is 800 horsepowers, the piston in cold oil road in the band edge circle, and the position of its first annular groove 2 is 22.0mm ± 0.15mm apart from the distance of piston head 1 end face; The position, interior cold oil road of piston is 109.4mm apart from the distance of piston base 4 bottom surfaces, the annular that interior cold oil road 3 is, and its section shape is that its size is seen Fig. 4-1 like egg type.Piston material is an aluminum alloy, and the preparation method of piston is with claim 4.With compare with the diesel engine piston of power usually, the operating temperature that this piston has piston head reduces by 5%, engine exhaust pressure is little, satisfies the requirement of high-power diesel engine (800 horsepowers of power) to piston.
Embodiment four: structure of piston size, material and preparation method are all with embodiment three, and the molded lines of piston: the oval amount of first annular groove fades to 0.05mm by 0.09mm; The oval amount of second annular groove fades to 0.11mm by 0.16mm; The 3rd annular groove is just round section; The skirt section fades to oval section.The cylinder prepareding gap 0.018mm of piston.
Embodiment five: structure of piston size, material and preparation method are all with embodiment three, and the molded lines of piston: the oval amount of first annular groove fades to 0.05mm by 0.09mm; The oval amount of second annular groove fades to 0.11mm by 0.16mm; The 3rd annular groove is just round section; The skirt section fades to oval section.The cylinder prepareding gap 0.016mm of piston.
Embodiment six: structure of piston size, material, molded lines, cylinder prepareding gap and preparation method be all with embodiment three, the annular that interior cold oil road is, and its section shape is a round rectangle, its size is seen Fig. 4-2.
Embodiment seven: power is 600 horsepowers, and section shape, cylinder prepareding gap and the preparation method in structure of piston size, material, molded lines, interior cold oil road are all with embodiment five.The piston in cold oil road in the band edge circle, the position of its first annular groove is 23.2mm ± 0.15mm apart from the distance of piston head 1 end face; The position, interior cold oil road of piston is 113.2mm apart from the distance of piston base 4 bottom surfaces.This piston with compare with the diesel engine piston of power usually, the operating temperature that this piston has piston head reduces by 8%, engine exhaust pressure reduces 4%.
Embodiment eight: referring to Fig. 2, power is 600 horsepowers, the piston in cold oil road in the band edge circle, and the position of its first annular groove is 20.7mm ± 0.15mm apart from the distance of piston head 1 end face; The position, interior cold oil road of piston is 110mm apart from the distance of piston base 4 bottom surfaces, the annular that interior cold oil road is, and its section shape is like egg type, its dimension reference Fig. 4-1.Piston material is an aluminum alloy, and the preparation method of piston is with claim 4.With compare with the diesel engine piston of power usually, the operating temperature that this piston has a piston head reduce and heat load low, engine exhaust pressure is little, satisfies the requirement of high-power diesel engine (600 horsepowers of power) to piston.
Embodiment nine: the section shape in structure of piston size, material, molded lines, interior cold oil road and cylinder prepareding gap are all with embodiment six, and its preparation method is:
1). the molten aluminium piston alloy liquid of joining, refinement and denaturation are handled the back 760 ℃ of insulations 30 minutes, prepare cast;
2). the preheating metal mold, the internal mold preheating temperature is controlled at 300 ℃, the outer mold preheating temperature is controlled at 250 ℃;
3). the removing surface of cast iron edge circle is clean, in temperature 710 ℃ aluminium liquid infiltration 10 minutes;
4). assembling metal type dies, the structure of this mould will be inlayed earlier and enclose the internal mold of packing into piston structure of the present invention, then press the assembling of Piston mould erection drawing, as shown in Figure 3;
5). with preheating temperature is that 300 ℃ interior cold oil road core is put into casting mold;
6). cast, 760 ℃ of pouring temperatures, the demoulding in 5 minutes.
Embodiment ten: piston and preparation method are with embodiment eight, and difference is: step 3). and the removing surface of cast iron edge circle is clean, in temperature 730 ℃ aluminium liquid infiltration 40 minutes;
Embodiment 11: piston and preparation method are with embodiment eight, and difference is: step 3). and the removing surface of cast iron edge circle is clean, in temperature 780 ℃ aluminium liquid infiltration 5 minutes;
Embodiment 12: piston and preparation method are with embodiment eight, and difference is: step 3). and the removing surface of cast iron edge circle is clean, in temperature 740 ℃ aluminium liquid infiltration 20 minutes;
Embodiment 13: piston and preparation method are with embodiment eight, and difference is: step 1). and molten material of joining piston is an aluminum matrix composite liquid.
Embodiment 14: power is 1200 horsepowers, the piston in cold oil road in the band edge circle, the position of its first annular groove apart from the position, interior cold oil road of the distance of piston head 1 and piston apart from the shape in the distance of piston bottom surface 4 and interior cold oil road 3 as embodiment three, the molded lines of piston is with claim 2, the cylinder prepareding gap 0.018mm of piston.Piston material is an aluminum matrix composite.The preparation method of piston is with claim 5.With compare with the diesel engine piston of power usually, the operating temperature that this piston has piston head reduces by 8%, engine exhaust pressure reduces 15%, satisfies the requirement of high-power diesel engine (1200 horsepowers of power) to piston.
Embodiment 15: the section shape in structure of piston size, material, molded lines, interior cold oil road and cylinder prepareding gap are all with embodiment six, and its preparation method is:
1). the molten aluminium piston alloy liquid of joining, refinement and denaturation are handled the back 760 ℃ of insulations 30 minutes, prepare cast;
2). the preheating metal mold, the internal mold preheating temperature is controlled at 300 ℃, the outer mold preheating temperature is controlled at 250 ℃;
3). the removing surface of cast iron edge circle is clean, in temperature 710 ℃ aluminium liquid infiltration 10 minutes;
4). assembling metal type dies, the structure of this mould will be inlayed earlier and enclose the internal mold of packing into piston structure of the present invention, then press the assembling of Piston mould erection drawing, as shown in Figure 4;
5). with preheating temperature is that 300 ℃ interior cold oil road core is put into casting mold;
6). cast, 760 ℃ of pouring temperatures, the demoulding in 5 minutes, nip pressure 80MPa keeps taking out after 40 seconds.
Claims (6)
1. piston of high power diesel engine, cold oil road in the band edge circle, power is 600-2000 horsepower, it is characterized in that: change position, position, interior cold oil road and the shape of first annular groove (2) of piston on the basis of existing piston of high power diesel engine structure, the position of first annular groove: the distance apart from piston head (1) end face is 20.7～23.5mm ± 0.15mm; The position, interior cold oil road of piston: the distance apart from piston base (4) bottom surface is 107.6～113.2mm, the annular that interior cold oil road (3) is, and its section shape is like egg type or round rectangle.
2. piston of high power diesel engine according to claim 1 is characterized in that: the cylinder prepareding gap of piston: 0.022～0.016mm; The molded lines of piston: the oval amount of first annular groove (2) fades to 0.05mm by 0.09mm; The oval amount of second annular groove fades to 0.11mm by 0.16mm; The 3rd annular groove is just round section; The skirt section fades to oval section.
3. according to the preparation method of claim 1 or the described piston of high power diesel engine of claim 2, it is characterized in that: adopt the cast inblock once-through, comprise whole gravity casting and extrusion casint.
4. the preparation method of piston of high power diesel engine according to claim 3 is characterized in that: the preparation method is the whole gravity casting method of metal mold, and concrete manufacturing step is:
1). molten aluminium piston alloy or the aluminum matrix composite liquid of joining, refinement and denaturation are handled the back 760 ℃ of insulations 30 minutes, prepare cast;
2). the preheating metal mold, the internal mold preheating temperature is controlled at 300 ℃, the outer mold preheating temperature is controlled at 250 ℃;
3). the removing surface of cast iron edge circle is clean, in temperature 710～780 ℃ aluminium liquid infiltration 5～40 minutes;
4). assembling metal type dies, the structure of this mould will be inlayed earlier and enclose the internal mold of packing into piston structure of the present invention, then press the assembling of Piston mould erection drawing;
5). with preheating temperature is that 300 ℃ interior cold oil road core is put into casting mold;
6). cast, 760 ℃ of pouring temperatures, the demoulding in 5 minutes.
5. the preparation method of piston of high power diesel engine according to claim 3 is characterized in that: the preparation method is extrusion casting method, and concrete manufacturing step is:
1). molten aluminium piston alloy or the aluminum matrix composite liquid of joining, after handling, refinement and denaturation, prepares cast 760 ℃ of insulations 30 minutes;
2). the preheating metal mold, the internal mold preheating temperature is controlled at 300 ℃, the outer mold preheating temperature is controlled at 250 ℃;
3). the removing surface of cast iron edge circle is clean, in temperature 710～780 ℃ aluminium liquid infiltration 5～40 minutes;
4). the assembling metal type dies, will inlay earlier and enclose the internal mold of packing into, then press the assembling of Piston mould erection drawing;
5). with preheating temperature is that cold oil road core is put into casting mold in 300 ℃;
6). cast, 760 ℃ of pouring temperatures, nip pressure 80MPa keeps taking out after 40 seconds.
6. piston of high power diesel engine according to claim 1 and 2 is characterized in that: used piston alloy can be aluminum alloy or aluminum matrix composite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100964722A CN100516491C (en) | 2005-12-05 | 2005-12-05 | Piston of high power diesel engine and method for fabricating same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100964722A CN100516491C (en) | 2005-12-05 | 2005-12-05 | Piston of high power diesel engine and method for fabricating same |
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| Publication Number | Publication Date |
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| CN1880748A true CN1880748A (en) | 2006-12-20 |
| CN100516491C CN100516491C (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100964722A Expired - Fee Related CN100516491C (en) | 2005-12-05 | 2005-12-05 | Piston of high power diesel engine and method for fabricating same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102019500A (en) * | 2010-12-22 | 2011-04-20 | 中国兵器工业第五二研究所 | Electron beam welding method for aluminium alloy pistons of high-power diesel engine |
| WO2017016934A1 (en) * | 2015-07-30 | 2017-02-02 | Mahle International Gmbh | Piston for an internal combustion engine |
| CN107127301A (en) * | 2016-02-29 | 2017-09-05 | 通用电气公司 | Utilize the casting of the first hardware and the second hardware |
| CN107130237A (en) * | 2016-02-29 | 2017-09-05 | 通用电气公司 | Utilize the casting of metal parts and metal skin layer |
| CN110935848A (en) * | 2019-12-13 | 2020-03-31 | 广州扶商缸套有限公司 | Inner cooling oil duct of aluminum alloy piston |
| CN111133186A (en) * | 2017-08-23 | 2020-05-08 | 天纳克有限责任公司 | Piston with wide oval channel |
| CN111485190A (en) * | 2020-06-05 | 2020-08-04 | 肇庆本田金属有限公司 | Method and device for reducing poor bonding of ring-inlaid piston |
-
2005
- 2005-12-05 CN CNB2005100964722A patent/CN100516491C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102019500A (en) * | 2010-12-22 | 2011-04-20 | 中国兵器工业第五二研究所 | Electron beam welding method for aluminium alloy pistons of high-power diesel engine |
| WO2017016934A1 (en) * | 2015-07-30 | 2017-02-02 | Mahle International Gmbh | Piston for an internal combustion engine |
| CN107923299A (en) * | 2015-07-30 | 2018-04-17 | 马勒国际有限公司 | Piston for internal combustion engine |
| US10487776B2 (en) | 2015-07-30 | 2019-11-26 | Mahle International Gmbh | Piston for an internal combustion engine |
| CN107923299B (en) * | 2015-07-30 | 2020-07-03 | 马勒国际有限公司 | Piston for an internal combustion engine |
| CN107127301A (en) * | 2016-02-29 | 2017-09-05 | 通用电气公司 | Utilize the casting of the first hardware and the second hardware |
| CN107130237A (en) * | 2016-02-29 | 2017-09-05 | 通用电气公司 | Utilize the casting of metal parts and metal skin layer |
| CN111133186A (en) * | 2017-08-23 | 2020-05-08 | 天纳克有限责任公司 | Piston with wide oval channel |
| CN111133186B (en) * | 2017-08-23 | 2022-07-01 | 天纳克有限责任公司 | Piston with wide oval channel |
| CN110935848A (en) * | 2019-12-13 | 2020-03-31 | 广州扶商缸套有限公司 | Inner cooling oil duct of aluminum alloy piston |
| CN111485190A (en) * | 2020-06-05 | 2020-08-04 | 肇庆本田金属有限公司 | Method and device for reducing poor bonding of ring-inlaid piston |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100516491C (en) | 2009-07-22 |
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