CN104209463A - Production material and process for internal combustion engine cylinder body and cylinder cover with light weight and high thermal fatigue strength - Google Patents
Production material and process for internal combustion engine cylinder body and cylinder cover with light weight and high thermal fatigue strength Download PDFInfo
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- CN104209463A CN104209463A CN201410435849.1A CN201410435849A CN104209463A CN 104209463 A CN104209463 A CN 104209463A CN 201410435849 A CN201410435849 A CN 201410435849A CN 104209463 A CN104209463 A CN 104209463A
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Abstract
The invention relates to a production process for an internal combustion engine cylinder body and cylinder cover with light weight and high thermal fatigue strength. The production process comprises the technological procedures of prefoaming of polystyrene beads, curing of the pre-foamed beads, blank forming, blank drying, blank combining, paint brushing, drying of the blank coated with paint, box burying and compaction, pouring of molten iron and discharging and polishing. In the step of pouring of the molten iron, vermicular graphite cast iron RuT300 is adopted for the cylinder body and cylinder cover, the molten iron comprises the components of C, Si, Mn, P, S, CE and the balance of Fe, the temperature of the molten iron is kept within 1430-1460 DEG C; the vermicularizing treatment is performed by using a rare earth silicon-iron alloy vermicularizing agent; the vermicularizing rate CG is not less than 60%, the box is vacuumized in pouring, the negative pressure is within -0.05 to -0.06 MPa, and the pressure is kept for 30 minutes. Castings produced by the process have the characteristics of high strength, high toughness and fine grains, and have high size precision and good surface quality.
Description
Technical field
The invention belongs to internal combustion engine cylinders cylinder cap casting field, be specifically related to the production materials and process of the high internal combustion engine cylinders cylinder cap of a kind of lightweight thermal fatigue strength.
Background technology
Automobile as walking machine is all relevant with its deadweight with blowdown with its energy consumptions such as tractors, and its speed is higher, associates larger.Internal combustion engine as its power source accounts for about 1/3rd of its weight, and cylinder block and head accounts for nearly 1/2nd of internal combustion engine weight, so the weight reducing cylinder block and head is most important, higher the riding of speed for this reason, mostly adopt aluminum alloy die casting, but its cost exceeds eight or nine times than ironcasting, so low-speed cars and used with tractor gasoline, diesel engine also all use cast iron housing and cylinder cap.Because internal combustion engine works under the hot stress alternation of height always, the thermal fatigue strength height of the material of internal combustion engine cylinders cylinder cap has a strong impact on its bearing capacity and life-span, and its tensile strength is low, particularly thermal fatigue strength is low, elastic modelling quantity is also low, these all cause the wall thickness of cylinder block and head to thicken, and cause internal combustion engine heavier-weight.And the casting character of conventional cast material is poor, molten iron flow characteristic is bad, the minimum wall thickness (MINI W.) of gray iron casting also must not be less than about 5mm, also internal combustion engine cylinders cylinder cap weight is made to increase, so, no matter at a high speed by bus or low-speed truck, find a kind of can produce lightweight, cost is low, the materials and process of the energy-conservation cylinder block and head reduced discharging again seems extremely important.
Summary of the invention
The present invention is exactly for the Heavy Weight existed in internal combustion engine cylinders cylinder cap, thermal fatigue strength is low, cost is high problem, and provides the production materials and process of the high internal combustion engine cylinders cylinder cap of a kind of lightweight thermal fatigue strength.
The technical solution used in the present invention: the production technology of the internal combustion engine cylinders cylinder cap that lightweight thermal fatigue strength is high, comprise following technological process: send out polystyrene bead in advance, by the bead slaking after sending out in advance, white mold forming, Bai Mo is dried, white die combination, swabbing, the white mould coating coating is dried, bury case jolt ramming, pouring molten iron, outlet is polished, pouring molten iron step wherein comprises: cylinder block and head selects the vermicular cast iron of the RuT300 trade mark, ladle is containing the chemical composition of following parts by weight: C:3.7 ~ 3.9%, Si:1.5 ~ 1.8%, Mn:0.5 ~ 0.8%, P :≤0.08%, S :≤0.06%, CE:4.3 ~ 4.6%, surplus is Fe, molten iron temperature controls at 1430 ~ 1460 DEG C, creepage rate is carried out with rare earth ferrosilicon alloy vermiculizer, nodulizing rate is CG >=60%, vacuumize in case during cast, negative pressure is at-0.05 ~-0.06MPa, pressurize 30 minutes.
The present invention's its beneficial effect compared with existing materials and process technology is: 1. vermicular cast iron has higher thermal fatigue strength, to compare not only its fatigue strength with aluminium alloy high more than 1 times with casting pig, and its casting character and the molten metal mobility in forming process also casts cylinder block and head far above the vermicular cast iron of other material, thermal fatigue strength is high, its tensile strength is high by 75%, elastic modelling quantity is also high by 40%, casting section thickness can be thinned to about 3mm, casting character is excellent, ensure that 3mm thickness wall pieces, and unlikely generation cold shut causes foundry goods to scrap; 2. vermicular cast iron has good casting character, its casting character and the molten metal mobility in forming process also casts cylinder block and head far above the vermicular cast iron of other material, therefore can with vermicular cast iron produce than same model aluminium alloy internal combustion engine cylinders cylinder cap also light 3% foundry goods
the foundry goods that lost foam casting process is produced not only has high strength, high tenacity and compact grained characteristic, and dimensional accuracy is high, surface quality is good,
because aluminium alloy cylinder cylinder cap is generally produced by extrusion process, lost foam process, lost foam casting process has again the effect reduced costs, so, with vermicular cast iron and lost foam process casting internal combustion engine cylinders cylinder cap, 7-8 cost doubly can be reduced concerning the cylinder block and head of the higher by bus gasoline engine of speed, concerning the weight that can reduce cylinder block and head more than 60% low-speed vehicle, accomplish not only energy-conservation but also reduce discharging.
Detailed description of the invention
Embodiment 1
A production technology for the internal combustion engine cylinders cylinder cap that lightweight thermal fatigue strength is high, it comprises following processing step:
(1) send out polystyrene bead in advance, be 0.4MPa by the bead of EPS in air pressure, vapor (steam) temperature is 85 DEG C, and expansion density is sent out in advance under the condition of 22g/L;
(2) will send out polystyrene bead slaking in advance rear, region, slaking storehouse keeps ventilating, 4 hours maturation process time;
(3) white mold forming, by mould and die preheating to 50 DEG C, matched moulds, reinforced, steam pressure remain on 0.4MPa, and time controling is at 50s;
(4) white mould is dried, and is dried by white mould under temperature 50 C condition;
(5) white die combination, is coated with cold glue or PUR bonding by model die joint;
(6) back-up sand, tamps semiclosed water channel chamber with precoated sand;
(7) the white mould surface brush lost foam casting fireproof coating will made, coating layer thickness is 1mm;
(8) dried by the white mould coating coating, temperature controls at 50 DEG C;
(9) bury case jolt ramming, evenly add sand with raining-type sand filling device, in case white moding shape, sand fills up 3 seconds rear jolt ramming time, and sandbox top plastic sheeting seals, and cup is put at cast gate place;
(10) pouring molten iron, cast blocks cylinder cap selects the vermicular cast iron of the RuT300 trade mark, molten iron chemical composition: C:3.7%, Si:1.5%, Mn:0.5%, P:0.05%, S:0.03%, CE:4.3%, surplus is Fe, molten iron temperature controls at 1430 DEG C, in bag, carry out creepage rate with rare earth ferrosilicon alloy vermiculizer, to ensure nodulizing rate CG >=60% thus to reach optimal mechanical properties, vacuumize in case during cast, negative pressure at-0.05MPa, pressurize 30 minutes;
(11) after cast, insulation is unpacked after 60 minutes again;
(12) after impeller blasting, smooth with grinder buffing, the vermicular cast iron internal combustion engine cylinders cylinder cap of system.
Embodiment 2
A production technology for the internal combustion engine cylinders cylinder cap that lightweight thermal fatigue strength is high, it comprises following processing step:
(1) send out polystyrene bead in advance, be 0.5MPa by the bead of EPS in air pressure, vapor (steam) temperature is 90 DEG C, and expansion density is sent out in advance under the condition of 23g/L;
(2) will send out polystyrene bead slaking in advance rear, region, slaking storehouse keeps ventilating, 5 hours maturation process time;
(3) white mold forming, by mould and die preheating to 60 DEG C, matched moulds, reinforced, steam pressure remain on 0.5MPa, and time controling is at 60s;
(4) white mould is dried, and is dried by white mould under temperature 53 DEG C of conditions;
(5) white die combination, is coated with cold glue or PUR bonding by model die joint;
(6) back-up sand, tamps semiclosed water channel chamber with precoated sand;
(7) the white mould surface brush lost foam casting fireproof coating will made, coating layer thickness is 1.2mm;
(8) dried by the white mould coating coating, temperature controls at 53 DEG C;
(9) bury case jolt ramming, evenly add sand with raining-type sand filling device, in case white moding shape, sand fills up 3 ~ 5 seconds rear jolt ramming time, and sandbox top plastic sheeting seals, and cup is put at cast gate place;
(10) pouring molten iron, cast blocks cylinder cap selects the vermicular cast iron of the RuT300 trade mark, molten iron chemical composition: C:3.8%, Si:1.6%, Mn:0.6%, P:0.07%, S:0.05%, CE:4.5%, surplus is Fe, molten iron temperature controls at 1450 DEG C, in bag, carry out creepage rate with rare earth ferrosilicon alloy vermiculizer, to ensure nodulizing rate CG >=60% thus to reach optimal mechanical properties, vacuumize in case during cast, negative pressure at-0.06MPa, pressurize 30 minutes;
(11) after cast, insulation is unpacked after 90 minutes again;
(12) after impeller blasting, smooth with grinder buffing, the vermicular cast iron internal combustion engine cylinders cylinder cap of system.
Embodiment 3
A production technology for the internal combustion engine cylinders cylinder cap that lightweight thermal fatigue strength is high, it comprises following processing step:
(1) send out polystyrene bead in advance, be 0.6MPa by the bead of EPS in air pressure, vapor (steam) temperature is 100 DEG C, and expansion density is sent out in advance under the condition of 26g/L;
(2) will send out polystyrene bead slaking in advance rear, region, slaking storehouse keeps ventilating, 6 hours maturation process time;
(3) white mold forming, by mould and die preheating to 70 DEG C, matched moulds, reinforced, steam pressure remain on 0.6MPa, and time controling is at 70s;
(4) white mould is dried, and is dried by white mould under temperature 55 DEG C of conditions;
(5) white die combination, is coated with cold glue or PUR bonding by model die joint;
(6) back-up sand, tamps semiclosed water channel chamber with precoated sand;
(7) the white mould surface brush lost foam casting fireproof coating will made, coating layer thickness is 1.3mm;
(8) dried by the white mould coating coating, temperature controls at 55 DEG C;
(9) bury case jolt ramming, evenly add sand with raining-type sand filling device, in case white moding shape, sand fills up 5 seconds rear jolt ramming time, and sandbox top plastic sheeting seals, and cup is put at cast gate place;
(10) pouring molten iron, cast blocks cylinder cap selects the vermicular cast iron of the RuT300 trade mark, molten iron chemical composition: C:3.9%, Si:1.8%, Mn:0.8%, P:0.08%, S:0.06%, CE:4.6%, surplus is Fe, molten iron temperature controls at 1460 DEG C, in bag, carry out creepage rate with rare earth ferrosilicon alloy vermiculizer, to ensure nodulizing rate CG >=60% thus to reach optimal mechanical properties, vacuumize in case during cast, negative pressure at-0.06MPa, pressurize 30 minutes;
(11) after cast, insulation is unpacked after 120 minutes again;
(12) after impeller blasting, smooth with grinder buffing, the vermicular cast iron internal combustion engine cylinders cylinder cap of system.
The present invention adopts thermal fatigue strength to double above than other material, and its casting character and the molten metal mobility in forming process also casts cylinder block and head far above the vermicular cast iron of other material, thermal fatigue strength is high, casting section thickness can be thinned to about 3mm, casting character is excellent, ensure that 3mm thickness wall pieces, and unlikely generation cold shut causes foundry goods to scrap; The present invention adopts lost foam casting process not only can realize the high-performance of foundry goods, high strength, high tenacity, grain refinement equally, and dimensional accuracy is high and how much inferior surface quality is also unlike die casting, vermicular cast iron material joins lost foam casting process, and strong combination can cast out top-quality cylinder block and head.
Claims (1)
1. the production technology of the internal combustion engine cylinders cylinder cap that lightweight thermal fatigue strength is high, comprise following technological process: send out polystyrene bead in advance, by the bead slaking after sending out in advance, white mold forming, Bai Mo is dried, white die combination, swabbing, the white mould coating coating is dried, bury case jolt ramming, pouring molten iron, outlet is polished, it is characterized in that: pouring molten iron step wherein comprises: cylinder block and head selects the vermicular cast iron of the RuT300 trade mark, ladle is containing the chemical composition of following parts by weight: C:3.7 ~ 3.9%, Si:1.5 ~ 1.8%, Mn:0.5 ~ 0.8%, P :≤0.08%, S :≤0.06%, CE:4.3 ~ 4.6%, surplus is Fe, molten iron temperature controls at 1430 ~ 1460 DEG C, creepage rate is carried out with rare earth ferrosilicon alloy vermiculizer, nodulizing rate is CG >=60%, vacuumize in case during cast, negative pressure is at-0.05 ~-0.06MPa, pressurize 30 minutes.
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| CN201410435849.1A CN104209463A (en) | 2014-09-01 | 2014-09-01 | Production material and process for internal combustion engine cylinder body and cylinder cover with light weight and high thermal fatigue strength |
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| CN201410435849.1A CN104209463A (en) | 2014-09-01 | 2014-09-01 | Production material and process for internal combustion engine cylinder body and cylinder cover with light weight and high thermal fatigue strength |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857425A (en) * | 2021-09-01 | 2021-12-31 | 扬州市瑞晟机械铸造有限公司 | Foam full-mold precision casting process of automobile stamping die |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61143554A (en) * | 1984-12-17 | 1986-07-01 | Kawasaki Steel Corp | Cast iron material for surface hardening |
| CN1843657A (en) * | 2006-04-25 | 2006-10-11 | 安徽天钰机械股份有限公司 | Lost-foam casting process for cylinder body and cylinder cap of diesel engine and gasoline engine |
| CN101381838A (en) * | 2008-10-17 | 2009-03-11 | 河南省中原内配股份有限公司 | Vermicular cast iron cylinder liner and preparation method thereof |
| CN102284679A (en) * | 2011-09-19 | 2011-12-21 | 滁州金诺实业有限公司 | Method for casting engine cylinder cover by using lost foam |
| CN103131942A (en) * | 2011-11-30 | 2013-06-05 | 山东省源通机械股份有限公司 | Vermicular graphite cast iron with high percent of vermiculation of combustion motor cylinder body and cylinder cover and preparation method |
| CN103990760A (en) * | 2014-05-23 | 2014-08-20 | 重庆汉华汽车零部件制造有限公司 | Lost foam casting process of aluminum alloy cylinder body or cylinder cover |
-
2014
- 2014-09-01 CN CN201410435849.1A patent/CN104209463A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61143554A (en) * | 1984-12-17 | 1986-07-01 | Kawasaki Steel Corp | Cast iron material for surface hardening |
| CN1843657A (en) * | 2006-04-25 | 2006-10-11 | 安徽天钰机械股份有限公司 | Lost-foam casting process for cylinder body and cylinder cap of diesel engine and gasoline engine |
| CN101381838A (en) * | 2008-10-17 | 2009-03-11 | 河南省中原内配股份有限公司 | Vermicular cast iron cylinder liner and preparation method thereof |
| CN102284679A (en) * | 2011-09-19 | 2011-12-21 | 滁州金诺实业有限公司 | Method for casting engine cylinder cover by using lost foam |
| CN103131942A (en) * | 2011-11-30 | 2013-06-05 | 山东省源通机械股份有限公司 | Vermicular graphite cast iron with high percent of vermiculation of combustion motor cylinder body and cylinder cover and preparation method |
| CN103990760A (en) * | 2014-05-23 | 2014-08-20 | 重庆汉华汽车零部件制造有限公司 | Lost foam casting process of aluminum alloy cylinder body or cylinder cover |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857425A (en) * | 2021-09-01 | 2021-12-31 | 扬州市瑞晟机械铸造有限公司 | Foam full-mold precision casting process of automobile stamping die |
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Application publication date: 20141217 |
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