CN103042195B - Extrusion casting manufacture method of piston with reinforced pseudo-alloy circular groove - Google Patents
Extrusion casting manufacture method of piston with reinforced pseudo-alloy circular groove Download PDFInfo
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- CN103042195B CN103042195B CN201210574362.2A CN201210574362A CN103042195B CN 103042195 B CN103042195 B CN 103042195B CN 201210574362 A CN201210574362 A CN 201210574362A CN 103042195 B CN103042195 B CN 103042195B
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Abstract
The invention relates to an extrusion casting manufacture method of a piston with a reinforced pseudo-alloy circular groove. The extrusion casting manufacture method is characterized by including the preparation process steps: firstly, preparing aluminum alloy for the piston; secondly, preparing pseudo-alloy components; thirdly, manufacturing a pseudo-alloy preformed part, uniformly mixing pseudo-alloy powder particles, and pressing and sintering the mixed particles via a die so that a pseudo-alloy insert ring preformed part is formed; fourthly, melting, namely, placing the prepared aluminum alloy for the piston into a melting furnace for melting, and refining, deteriorating, homogenizing and refining alloy liquid after melting; fifthly, preheating the pseudo-alloy preformed part; seventhly, performing extrusion casting; eighthly, performing aging heat treatment for a piston blank and performing air cooling after the piston blank taps off; and ninthly, machining and performing surface treatment for the piston blank so that an aluminum piston finished product is obtained. Compared with the prior art, the extrusion casting manufacture method has the advantages that the piston with the reinforced circular groove is good in wear resistance, compact in material internal texture and remarkably improved in mechanical performance, and the method is high in process efficiency and low in manufacture cost.
Description
Technical field
The present invention relates to a kind of method for casting piston, relate in particular to the manufacture method that a kind of pseudo-alloy that is applied to use in the more severe highly-intensified diesel engine field of engine operating condition strengthens groove piston.
Background technology
At present, China's piston of automobile engine generally adopts ZL108, ZL109 Birmasil, material mechanical performance is tensile strength (Rm) 220MPa～240MPa, percentage elongation (A) 0.5%～1.0%, high temperature (300 ℃) tensile strength 60MPa～80MPa.Highly-intensified diesel engine is all to the development of high-power, high load capacity, and aluminium piston is as the important reciprocating member of internal combustion engine, and its performance directly affects the Performance And Reliability of highly-intensified diesel engine.Aluminium piston is typically provided with cooling oil chamber in thick large part and piston is carried out cooling, adopts castingin high nickel cast iron abrasion-proof inserted ring, to improve the wearability of first ring groove location in the first ring groove location of piston.High reinforcing stimulus requires very high to castability with single-piece piston, do not allow to occur any casting flaw.Adopt conventional metal mold gravity casting and sand casting aluminium piston, be easy to produce the casting flaws such as pore, shrinkage porosite, crackle, slag inclusion, microstructure density contrast, mechanical property can not meet instructions for use, moreover, routine casting method, production efficiency is low, labour intensity is large.
Domestic and international existing piston for diesel engine adopts high nickel cast iron edge circle to strengthen in first ring groove location conventionally, thick large part is typically provided with cooling oil chamber and carries out cooling to piston, adopt gravity foundry technology moulding, there is Heavy Weight, high nickel cast iron edge ring and the defect such as aluminum substrate bond strength is low in piston, thereby causes that piston service life is short, dependability is poor.
" 11th Five-Year " is found in the research process of high intensification piston of diesel engine: adopt the first annular groove castingin high nickel cast iron prepared by gravity foundry technology to inlay the all-aluminium piston enclosing, occur the phenomenon that high nickel cast iron edge circle is thrown off when hydraulic circulation Fatigue Simulation certification test at my place.Increasing substantially of the rotating speed of high reinforcing stimulus and maximum combustion pressure, the suffered mechanical load in first piston ring groove position is sharply increased, between the high nickel cast iron edge circle of employing Al-Fin method castingin and aluminum substrate, the bond strength of 20-40MPa can not meet instructions for use, and it is the key that can piston meet instructions for use that raising edge encloses bond strength.
Summary of the invention
Technical problem to be solved by this invention is that a kind of manufacture method that provides edge circle is high and lightweight with substrate combinating strength, anti-wear performance is good pseudo-alloy to strengthen groove piston is provided the present situation for prior art.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of pseudo-alloy strengthens the extrusion casint manufacture method of groove piston, it is characterized in that comprising being prepared as follows processing step:
1. prepare aluminium alloys for pistons, this alloy compositions and mass percent are:
Cr, Pb, Ca and Sn impurity element total amount are no more than 0.5%, and all the other are Al;
2. configure pseudo-alloying component, the component of pseudo-alloy powder particle and mass percent are:
C, O, S and P impurity element total amount are no more than 1.0%, and all the other are Fe;
3. make pseudo-alloy prefabricated component, after the pseudo-alloy powder particle of configuration is mixed evenly, through mould compacting, sintering, form pseudo-alloy edge circle prefabricated component.
4. melting is processed, and by the aluminium alloys for pistons of preparation, puts into melting furnace and melts, and after fusing, alloy liquid carries out refining, rotten, refinement, refining treatment;
It is 720 ℃～740 ℃ that temperature of aluminum liquid is controlled, and adopts refining agent to carry out refining treatment,
It is 780 ℃～800 ℃ that temperature of aluminum liquid is controlled, and adopts alterant to process the processing of going bad,
It is 740 ℃～760 ℃ that temperature of aluminum liquid is controlled, and adopts fining agent to process,
It is 730 ℃～740 ℃ that temperature of aluminum liquid is controlled, and adopts refining agent to process, after static 15～30 minutes,
And temperature of aluminum liquid is controlled and is 720 ℃～730 ℃, to be cast;
5. pseudo-alloy prefabricated component preheating, the electrothermal furnace that the pseudo-alloy edge circle prefabricated component of having prepared is put into 250 ℃～300 ℃ of temperature carries out preheating, and be 1～2h preheating time;
6. mould and die preheating, is preheating to 200 ℃～250 ℃ to the drift of mould, internal mold, core print before extrusion casint;
7. extrusion casint, preheated pseudo-alloy edge circle prefabricated component is fixed on the internal mold of mould, in mold cavity, pour into processed good aluminum alloy melt, aluminum alloy melt pouring temperature is 720 ℃～730 ℃, closed die drift, pressurize, pressurization pressure 90MPa～110MPa, aluminum alloy melt is penetrated in the hole of pseudo-alloy edge circle prefabricated component, after aluminum alloy melt solidifies completely, form pseudo-alloy edge circle composite, release, eject core print, take out pseudo-alloy edge circle and strengthen annular groove composite material piston blank, and in 30s, put into 60 ℃～80 ℃ water and carry out Quenching Treatment,
8. piston blank is carried out to timeliness heat treatment, aging temperature is 200 ± 5 ℃, insulation 7.5-8.5h, air cooling after coming out of the stove;
9. piston blank part is carried out to machining and surface treatment, obtain aluminium piston finished product.
As preferably, step 4. described alterant is compound microcosmic salt alloy, to add quality be aluminium alloy quality 0.3%～0.5%, described fining agent is al-ti-b refiner, to add quality be aluminium alloy quality 0.1%～0.2%, described refining agent is that the model that Sichuan Lan De high-tech industry Co., Ltd produces is JA04C aluminum refining agent, and to add quality be aluminium alloy quality 0.3%～0.5%.
As preferably, step 3. described pseudo-alloy powder particle average-size is less than 80 μ m, and the porosity of pseudo-alloy edge circle prefabricated component is 40%～50%.
Compared with prior art, the invention has the advantages that:
1, piston ring groove position adopts pseudo-alloy edge circle reinforcing material, be prepared into the prefabricated component with higher porosity, in piston extrusion casint forming technology, aluminum alloy melt under the effect of mechanical pressure to diffusion in the hole of prefabricated component, solidify, crystallization, form composite, strengthened piston ring groove position;
2, annular groove position adopts pseudo-alloy edge circle composite to replace traditional high nickel cast iron edge circle, and wearability is better than high nickel cast iron edge circle, and piston alleviates approximately 2%;
3, more than the bond strength of pseudo-alloy edge circle composite and piston aluminum matrix alloy reaches 100MPa, the bond strength far above high nickel cast iron edge circle with aluminium alloy;
4, there is not the difference at the interface that combines between the higher and lower levels in pseudo-alloy edge circle, is better than alumina fibre reinforced composite piston;
5, it is very approaching that the pseudo-alloy edge of piston circle strengthens thermal conductivity and the piston aluminum matrix alloy at position, can effectively prevent from that annular groove from strengthening under the effect of the stress that colds and heat succeed each other at position to cause strengthening the disengagement that position edge encloses, and piston dependability significantly strengthens;
6, by the one-time formed single-piece piston blank of Extrution casting technique, material inside organization is fine and close, and mechanical property significantly improves, and process efficiency is high, low cost of manufacture.
Accompanying drawing explanation
Fig. 1 is technology flow chart of the present invention.
The structural representation of pseudo-alloy edge circle prefabricated component in Fig. 2 embodiment.
Fig. 3 is the squeeze cast form mould structure schematic diagram that in embodiment, pseudo-alloy edge circle strengthens groove piston.
Fig. 4 is that the pseudo-alloy edge circle of moulding in embodiment strengthens groove piston blahk structure schematic diagram.
Fig. 5 is that in embodiment, pseudo-alloy edge circle strengthens groove piston finished product structure schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
Embodiment 1
The extrusion casint manufacture method preparation process that this puppet alloy strengthens groove piston is as follows:
1. prepare aluminium alloys for pistons, this alloy compositions and mass percent are: Si:11.0%; Mg:0.6%; Cu:2.6%; Ni:1.8%; Fe:0.1%; Ti:0.1%; Mn:0.01%; Zn:0.01%; Cr, Pb, Ca and Sn impurity element total amount are no more than 0.5%, and all the other are Al;
2. configure pseudo-alloying component, the component of pseudo-alloy powder particle and mass percent are: Cr:15%; Ni:11%; Si:1%; Mn:1%; C, O, S and P impurity element total amount are no more than 1.0%, and all the other are Fe;
3. make pseudo-alloy prefabricated component, the pseudo-alloy powder particle average-size of configuration is less than to 80 μ m, after confusion is even, controlling pseudo-alloy edge circle prefabricated component 1 porosity is 40%, through mould compacting, sintering, forms pseudo-alloy and inlays circle prefabricated component 1.
4. melting is processed, by the aluminium alloys for pistons of preparation, putting into melting furnace melts, after fusing, alloy liquid carries out refining, rotten, refinement, refining treatment, it is 720 ℃ that temperature of aluminum liquid is controlled, the model that adopts Sichuan Lan De high-tech industry Co., Ltd to produce is JA04C aluminum refining agent, and to add quality be aluminium alloy 0.3%; It is 780 ℃ that temperature of aluminum liquid is controlled, and adopts the processing of go bad of the compound microcosmic salt alterant of ZS-ABP, and interpolation quality is aluminium alloy quality 0.3%; It is 740 ℃ that temperature of aluminum liquid is controlled, and adopts al-ti-b refiner to carry out thinning processing, and to add quality be aluminium alloy quality 0.1%; It is 730 ℃ that temperature of aluminum liquid is controlled, and adopts and processes, and to add quality be aluminium alloy quality 0.3%; After static 15 minutes, and temperature of aluminum liquid is controlled and is 720 ℃, to be cast;
5. pseudo-alloy prefabricated component preheating, the electrothermal furnace of the pseudo-alloy edge circle prefabricated component 1 of having prepared being put into 250 ℃ of temperature carries out preheating, preheating time 1.5h;
6. mould and die preheating, is preheating to 200 ℃ to the drift 2 of mould, internal mold 3, core print 4 before extrusion casint;
7. extrusion casint, preheated pseudo-alloy edge circle prefabricated component 1 is fixed on the internal mold 3 of mould, in mold cavity, pour into processed good aluminum alloy melt, aluminum alloy melt pouring temperature is 720 ℃, closed die drift 2, pressurize, pressurization pressure 90MPa, aluminum alloy melt is penetrated in the hole of pseudo-alloy edge circle prefabricated component 1, after aluminum alloy melt solidifies completely, forms pseudo-alloy edge circle composite 1a, release, eject core print 4, take out pseudo-alloy edge circle and strengthen annular groove composite material piston blank, and in 30s, put into 60 ℃ of water and carry out Quenching Treatment;
8. piston blank is carried out to timeliness heat treatment, aging temperature is 195 ℃, insulation 7.5h, air cooling after coming out of the stove;
9. piston blank part is carried out to machining and surface treatment, obtain aluminium piston finished product.
In the present embodiment, resulting pseudo-alloy edge circle strengthens annular groove composite material piston, and as shown in Figure 5, internal piston dense structure, without casting flaw for concrete structure; Wearability is better than high nickel cast iron edge circle, and piston alleviates, and pseudo-alloy edge circle strengthens the difference that annular groove composite does not exist the interface that combines between the higher and lower levels, and is better than alumina fibre reinforced composite piston; Pseudo-alloy edge ring groove location detects in conjunction with good through fluorescent penetrant, and the bond strength that pseudo-alloy edge circle strengthens annular groove position and piston aluminum matrix alloy is greater than 100MPa, and heat-resisting and anti-wear performance is better than high nickel cast iron ring-mounted piston, and piston dependability significantly strengthens.
Embodiment 2
1. prepare aluminium alloys for pistons, this alloy compositions and mass percent are: Si:12.0%; Mg:1.0%; Cu:3.2%; Ni:2.2%; Fe:0.2%; Ti:0.15%; Mn:0.1%; Zn:0.1%; Cr, Pb, Ca and Sn impurity element total amount are no more than 0.5%, and all the other are Al;
2. configure pseudo-alloying component, the component of pseudo-alloy powder particle and mass percent are: Cr:20%; Ni:15%; Si:3%; Mn:1.5%; C, O, S and P impurity element total amount are no more than 1.0%, and all the other are Fe;
3. make pseudo-alloy prefabricated component, the pseudo-alloy powder particle average-size of configuration is less than to 80 μ m, after confusion is even, controlling pseudo-alloy edge circle prefabricated component 1 porosity is 45%, through mould compacting, sintering, forms pseudo-alloy and inlays circle prefabricated component 1.
4. melting is processed, by the aluminium alloys for pistons of preparation, putting into melting furnace melts, after fusing, alloy liquid carries out refining, rotten, refinement, refining treatment, it is 730 ℃ that temperature of aluminum liquid is controlled, the model that adopts Sichuan Lan De high-tech industry Co., Ltd to produce is JA04C aluminum refining agent, and to add quality be aluminium alloy 0.4%; It is 790 ℃ that temperature of aluminum liquid is controlled, and adopts the processing of go bad of the compound microcosmic salt alterant of ZS-ABP, and interpolation quality is aluminium alloy quality 0.4%; It is 750 ℃ that temperature of aluminum liquid is controlled, and adopts al-ti-b refiner to carry out thinning processing, and to add quality be aluminium alloy quality 0.2%; It is 735 ℃ that temperature of aluminum liquid is controlled, and adopts and processes, and to add quality be aluminium alloy quality 0.4%; After static 20 minutes, and temperature of aluminum liquid is controlled and is 725 ℃, to be cast;
5. pseudo-alloy prefabricated component preheating, the electrothermal furnace of the pseudo-alloy edge circle prefabricated component 1 of having prepared being put into 280 ℃ of temperature carries out preheating, preheating time 1h;
6. mould and die preheating, is preheating to 230 ℃ to the drift 2 of mould, internal mold 3, core print 4 before extrusion casint;
7. extrusion casint, preheated pseudo-alloy edge circle prefabricated component 1 is fixed on the internal mold 3 of mould, in mold cavity, pour into processed good aluminum alloy melt, aluminum alloy melt pouring temperature is 725 ℃, closed die drift 2, pressurize, pressurization pressure 100MPa, aluminum alloy melt is penetrated in the hole of pseudo-alloy edge circle prefabricated component 1, after aluminum alloy melt solidifies completely, forms pseudo-alloy edge circle composite 1a, release, eject core print 4, take out pseudo-alloy edge circle and strengthen annular groove composite material piston blank, and in 30s, put into 70 ℃ of water and carry out Quenching Treatment;
8. piston blank is carried out to timeliness heat treatment, aging temperature is 200 ℃, insulation 8h, air cooling after coming out of the stove;
9. piston blank part is carried out to machining and surface treatment, obtain aluminium piston finished product.
In the present embodiment, resulting pseudo-alloy edge circle strengthens annular groove composite material piston, and as shown in Figure 5, internal piston dense structure, without casting flaw for concrete structure; Wearability is better than high nickel cast iron edge circle, and piston alleviates, and pseudo-alloy edge circle strengthens the difference that annular groove composite does not exist the interface that combines between the higher and lower levels, and is better than alumina fibre reinforced composite piston; Pseudo-alloy edge ring groove location detects in conjunction with good through fluorescent penetrant, and the bond strength that pseudo-alloy edge circle strengthens annular groove position and piston aluminum matrix alloy is greater than 100MPa, and heat-resisting and anti-wear performance is better than high nickel cast iron ring-mounted piston, and piston dependability significantly strengthens.
Embodiment 3
1. prepare aluminium alloys for pistons, this alloy compositions and mass percent are: Si:13.0%; Mg:1.2; Cu:4.0%; Ni:2.8%; Fe:0.3%; Ti:0.2%; Mn:0.2%; Zn:0.2%; Cr, Pb, Ca and Sn impurity element total amount are no more than 0.5%, and all the other are Al;
2. configure pseudo-alloying component, the component of pseudo-alloy powder particle and mass percent are: Cr:30%; Ni:18%; Si:5%; Mn:2%; C, O, S and P impurity element total amount are no more than 1.0%, and all the other are Fe;
3. make pseudo-alloy prefabricated component, the pseudo-alloy powder particle average-size of configuration is less than to 80 μ m, after confusion is even, controlling pseudo-alloy edge circle prefabricated component 1 porosity is 50%, through mould compacting, sintering, forms pseudo-alloy and inlays circle prefabricated component 1.
4. melting is processed, by the aluminium alloys for pistons of preparation, putting into melting furnace melts, after fusing, alloy liquid carries out refining, rotten, refinement, refining treatment, it is 740 ℃ that temperature of aluminum liquid is controlled, the model that adopts Sichuan Lan De high-tech industry Co., Ltd to produce is JA04C aluminum refining agent, and to add quality be aluminium alloy 0.5%; It is 800 ℃ that temperature of aluminum liquid is controlled, and adopts the processing of go bad of the compound microcosmic salt alterant of ZS-ABP, and interpolation quality is aluminium alloy quality 0.5%; It is 760 ℃ that temperature of aluminum liquid is controlled, and adopts al-ti-b refiner to carry out thinning processing, and to add quality be aluminium alloy quality 0.3%; It is 740 ℃ that temperature of aluminum liquid is controlled, and adopts and processes, and to add quality be aluminium alloy quality 0.5%; After static 30 minutes, and temperature of aluminum liquid is controlled and is 730, to be cast;
5. pseudo-alloy prefabricated component preheating, the electrothermal furnace of the pseudo-alloy edge circle prefabricated component 1 of having prepared being put into 300 ℃ of temperature carries out preheating, preheating time 2h;
6. mould and die preheating, is preheating to 250 ℃ to the drift 2 of mould, internal mold 3, core print 4 before extrusion casint;
7. extrusion casint, preheated pseudo-alloy edge circle prefabricated component 1 is fixed on the internal mold 3 of mould, in mold cavity, pour into processed good aluminum alloy melt, aluminum alloy melt pouring temperature is 730 ℃, closed die drift 2, pressurize, pressurization pressure 110MPa, aluminum alloy melt is penetrated in the hole of pseudo-alloy edge circle prefabricated component 1, after aluminum alloy melt solidifies completely, forms pseudo-alloy edge circle composite 1a, release, eject core print 4, take out pseudo-alloy edge circle and strengthen annular groove composite material piston blank, and in 30s, put into 80 ℃ of water and carry out Quenching Treatment;
8. piston blank is carried out to timeliness heat treatment, aging temperature is 205 ℃, insulation 8.5h, air cooling after coming out of the stove;
9. piston blank part is carried out to machining and surface treatment, obtain aluminium piston finished product.
In the present embodiment, resulting pseudo-alloy edge circle strengthens annular groove composite material piston, and as shown in Figure 5, internal piston dense structure, without casting flaw for concrete structure; Wearability is better than high nickel cast iron edge circle, and piston alleviates, and pseudo-alloy edge circle strengthens the difference that annular groove composite does not exist the interface that combines between the higher and lower levels, and is better than alumina fibre reinforced composite piston; Pseudo-alloy edge ring groove location detects in conjunction with good through fluorescent penetrant, and the bond strength that pseudo-alloy edge circle strengthens annular groove position and piston aluminum matrix alloy is greater than 100MPa, and heat-resisting and anti-wear performance is better than high nickel cast iron ring-mounted piston, and piston dependability significantly strengthens.
Claims (3)
1. pseudo-alloy strengthens an extrusion casint manufacture method for groove piston, it is characterized in that comprising being prepared as follows processing step:
1. prepare aluminium alloys for pistons, comprise following mass component:
Cr, Pb, Ca and Sn impurity element total amount are no more than 0.5%, and all the other are Al;
2. configure pseudo-alloying component, the component of pseudo-alloy powder particle and mass percent are:
C, O, S and P impurity element total amount are no more than 1.0%, and all the other are Fe;
3. make pseudo-alloy prefabricated component, after described pseudo-alloy powder particle is mixed, through mould compacting, sintering, form pseudo-alloy edge circle prefabricated component;
4. melting is processed, and by described aluminium alloys for pistons, puts into melting furnace and melts, and after fusing, alloy liquid carries out refining, rotten, refinement, refining treatment;
It is 720 ℃～740 ℃ that temperature of aluminum liquid is controlled, and adopts refining agent to carry out refining treatment;
It is 780 ℃～800 ℃ that temperature of aluminum liquid is controlled, and adopts alterant to process the processing of going bad;
It is 740 ℃～760 ℃ that temperature of aluminum liquid is controlled, and adopts fining agent to process;
It is 730 ℃～740 ℃ that temperature of aluminum liquid is controlled, and adopts refining agent to process, static 15～30 minutes; And temperature of aluminum liquid is controlled to 720 ℃～730 ℃, to be cast;
5. pseudo-alloy prefabricated component preheating, the electrothermal furnace that the pseudo-alloy edge circle prefabricated component of having prepared is put into 250 ℃～300 ℃ of temperature carries out preheating, and be 1～2h preheating time;
6. mould and die preheating, is preheating to 200 ℃～250 ℃ to the drift of mould, internal mold, core print before extrusion casint;
7. extrusion casint, preheated pseudo-alloy edge circle prefabricated component is fixed on the internal mold of mould, in mold cavity, pour into processed good aluminum alloy melt, aluminum alloy melt pouring temperature is 720 ℃～730 ℃, closed die drift, pressurize, pressurization pressure 90MPa～110MPa, aluminum alloy melt is penetrated in the hole of pseudo-alloy edge circle prefabricated component, after aluminum alloy melt solidifies completely, form pseudo-alloy edge circle composite, release, eject core print, take out pseudo-alloy edge circle and strengthen annular groove composite material piston blank, and in 30s, put into 60 ℃～80 ℃ water and carry out Quenching Treatment,
8. piston blank is carried out to timeliness heat treatment, aging temperature is 200 ± 5 ℃, insulation 7.5-8.5h, air cooling after coming out of the stove;
9. piston blank part is carried out to machining and surface treatment, obtain aluminium piston finished product.
2. pseudo-alloy according to claim 1 strengthens the extrusion casint manufacture method of groove piston, it is characterized in that the alterant described in step is 4. compound microcosmic salt alloy, and to add quality be aluminium alloy quality 0.3%～0.5%; Described fining agent is al-ti-b refiner, and to add quality be aluminium alloy quality 0.1%～0.2%; Described refining agent is that model is JA04C aluminum refining agent, and to add quality be aluminium alloy quality 0.3%～0.5%.
3. pseudo-alloy according to claim 1 and 2 strengthens the extrusion casint manufacture method of groove piston, it is characterized in that described in step 3. that pseudo-alloy powder particle average-size is less than 80 μ m, and the porosity of pseudo-alloy edge circle prefabricated component is 40～50%.
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| DE4134530A1 (en) * | 1990-10-18 | 1992-05-07 | Metal Leve Sa | Piston head mfg. process - involves using compressed elastic inserts for cooling chamber to reduce heat at combustion chamber edges |
| DE102004056519A1 (en) * | 2004-11-24 | 2006-06-01 | Mahle Gmbh | Method for producing a piston for an internal combustion engine |
| CN101569926A (en) * | 2009-05-27 | 2009-11-04 | 中国兵器工业第五二研究所 | Method for casting aluminum piston with insert ring and cooling coil pipe |
| CN102401129A (en) * | 2010-09-15 | 2012-04-04 | 上海工程机械厂有限公司 | Cast-in piston body and casting method thereof |
| CN102205409A (en) * | 2011-04-28 | 2011-10-05 | 上海交通大学 | Method for manufacturing compound piston blank used for internal combustion engine |
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