CN102463326A - Casting die for valve shell casting of marine diesel engine and casting process of valve shell - Google Patents

Casting die for valve shell casting of marine diesel engine and casting process of valve shell Download PDF

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Publication number
CN102463326A
CN102463326A CN2011103309899A CN201110330989A CN102463326A CN 102463326 A CN102463326 A CN 102463326A CN 2011103309899 A CN2011103309899 A CN 2011103309899A CN 201110330989 A CN201110330989 A CN 201110330989A CN 102463326 A CN102463326 A CN 102463326A
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China
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core
casting
resin sand
die
sand
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CN2011103309899A
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Chinese (zh)
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CN102463326B (en
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钱坤才
严运涛
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南车戚墅堰机车车辆工艺研究所有限公司
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Priority to CN 201010523326 priority Critical patent/CN101947641A/en
Priority to CN201010523326.4 priority
Application filed by 南车戚墅堰机车车辆工艺研究所有限公司 filed Critical 南车戚墅堰机车车辆工艺研究所有限公司
Priority to CN 201110330989 priority patent/CN102463326B/en
Publication of CN102463326A publication Critical patent/CN102463326A/en
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Publication of CN102463326B publication Critical patent/CN102463326B/en

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Abstract

The invention discloses a casting die for a valve shell casting of a marine diesel engine and a casting process of the valve shell. The casting die is mainly characterized in that a contoured chill is additionally arranged at the outer end face of the flange cavity of the valve shell, a combined sand core is adopted, a chrome sand layer is distributed at the thick part of the casting wall of the sand core, and pouring gates and dead heads are reasonably arranged. The casting process is mainly characterized by comprising compounding, smelting, treatment before assembly of the casting die and die assembling by matching core, pouring and cleaning. The casting die for the valve shell casting of the marine diesel engine and the casting process of the valve shell has the advantages of reasonable structure of the casting die, simplicity and easiness to control in the casting process, uniformness in cooling of the casting and good feeding effect, effectively overcomes the leakage of the finished valve shell, and provides support for localization of all valve shell castings.

Description

The casting die of marine diesel air bleeding valve valve casing foundry goods and the casting technique of said valve casing
Technical field
The present invention relates to casting technique, be specifically related to a kind of casting die of marine diesel air bleeding valve valve casing foundry goods and the casting technique of said valve casing.
Background technology
Said marine diesel air bleeding valve valve casing is that its volume is φ 152 * high 352mm, the steel-casting of the 32Kg that weighs.It is the strength member of said diesel exhaust valve.On commercial production, said valve casing rough casting generally adopts the cast molding of low-carbon (LC) chromium alloyed steel.The chemical analysis of said material is: C0.12 ~ 0.17, Si0.30 ~ 0.40, Mn0.40 ~ 0.60, Cr2.80 ~ 3.20, Mo0.35 ~ 0.65, Cu≤0.40, Ni≤0.40, S≤0.04, P≤0.04, Fe surplus; The requirement of the said mechanical property of materials is: tensile strength>=620Mpa, yield strength>=420Mpa, percentage elongation>=13%, ballistic work AKV 2>=25J, hardness 179 ~ 225HB.Require said valve casing in the 20Mpa pressure test, not produce and press the leakage situation.
Because the planform more complicated of said valve casing; Wall thickness variation is bigger; So that foundry goods cooling degree of each several part in casting process is inhomogeneous, and partly produces shrinkage porosite and shrinkage cavity at wall thickness extremely easily, the thin-walled part extremely be easy to generate again molten steel fill type bad with contract flat.Thereby the percentage of A-class goods of said valve casing foundry goods is lower, has casting flaws such as surperficial scab; The manufactured goods valve casing usually can be pressed leakage problem.For this reason, present said valve casing foundry goods is still needed by external import.
Summary of the invention
The present invention aims to provide a kind of rational in infrastructure; In the cooling of foundry goods casting cycle medium casting each several part evenly; Be difficult for producing defectives such as shrinkage porosite, shrinkage cavity and surperficial scab, the casting die of the marine diesel air bleeding valve valve casing foundry goods that the foundry goods percentage of A-class goods is higher and the casting technique of said valve casing are to overcome the casting flaw of said valve casing; Fundamentally improve the quality of said valve casing, for said valve casing foundry goods production domesticization provides support.
The present invention realizes that the technical scheme that its purpose is taked is:
A kind of casting die of marine diesel air bleeding valve valve casing foundry goods, said casting die is the resin sand mo(u)ld, and its:
With the wicket of said foundry goods and the longitudinal center line of big window is die joint, constitutes upper and lower involutory upper impression resin sand mo(u)ld and lower impressions resin sand mo(u)ld respectively with phenolic sand molding;
Position, outer face at the said foundry goods flange die cavity of said upper impression resin sand mo(u)ld and lower impressions resin sand mo(u)ld is furnished with contoured chill;
Drop on the core in the resin sand model cavity, comprise by resin sand through molded first core of getting of core, second core, the 3rd core and the 4th core; Between first core and second core, connect fixing by the earthenware that meets said cast casting technological requirement; The other end of first core and contoured chill setting-in are mutually fixed, and an end setting-in of the other end of second core and the 3rd core is fixed, and the other end of the 3rd core and upper impression resin sand mo(u)ld and lower impressions resin sand mo(u)ld setting-in are mutually fixed; The 4th core is fixed on the upper impression resin sand mo(u)ld;
Be positioned at the surface at the cone table position of second core, be laid with the chrome ore layer of sand;
The runner system that comprises sprue, cross gate and ingate is laid on the die joint of upper impression resin sand mo(u)ld and lower impressions resin sand mo(u)ld; And the intersection of cross gate and ingate is provided with collection slag feeding blind riser;
Being used for the rising head of feeding is respectively first rising head and second rising head; First rising head is arranged in the upper impression resin sand mo(u)ld directly over first core middle part, and second rising head is arranged in the upper impression resin sand mo(u)ld that gets close to directly over the said foundry goods wicket core.
Can be understood by above given technical scheme, casting die according to the invention is owing to arranged contoured chill and chrome ore sand bed at the die cavity of said casting section thickness part; And make the evenly cooling of the thin part of casting section thickness part and wall, and partly arranged feeding head at said casting section thickness, avoided the shrinkage porosite shrinkage cavity defect; And adopt the runner system of collection slag feeding; Avoided the inner dreg defect of foundry goods, under the casting technique condition that the present invention advocated, the percentage of A-class goods of said valve casing foundry goods has been improved; Avoided pressing the generation of leakage problem, thereby realized the object of the invention.
In technique scheme; The present invention also advocates; The thickness of said contoured chill is 20 ~ 40mm; The height of said collection slag feeding blind riser is 145 ~ 155mm, and said first rising head and second rising head are oval open riser of φ 80 * 120mm or heat preservation blind riser, and the thickness of said chrome ore layer of sand is 15 ~ 20mm; Comprise also being located in the husky mould of upper impression resin and being positioned at the steam vent on the said foundry goods flange die cavity top that the diameter of steam vent is φ 8 ~ 15mm.This technical scheme is to guarantee casting quality, avoids the effective measures of said casting flaw, but is not limited thereto.Said thickness, height and diameter etc. all can be done concrete adjustment according to actual needs.But the present invention does not advocate, said thickness, height and diameter are less than the scope of said size.
In order to improve the production efficiency of foundry goods according to the invention; Improve finished casting rate; The present invention advocates that also said casting die is one case two mould, divides at a distance of 340 mm at least between 2 resin sand die cavity longitudinal center lines and opens symmetric arrangement; And 2 resin sand model cavities each have ingate, and the sprue of shared 1 runner system and cross gate.Certainly, be not limited thereto.If the permission of produced on-site condition also can be one case multimode.Under the condition of one case multimode, said runner system should be done necessary adjustment.
The casting technique of the said valve casing that the present invention advocated is:
A kind of casting technique of valve casing as previously discussed comprises batching, melting, and casting die matched moulds pre-treatment and join the core matched moulds, cast and cleaning, and its:
With above-mentioned casting die is the pouring molten steel shaping mould;
Said batching is with mild steel waste material and stainless steel waste material and molybdenum-iron, by the chemical composition of said valve casing, carries out weighing and burden respectively;
Said melting is to adopt intermediate frequency furnace remelting furnace charge, before molten steel is come out of the stove, presses 1 ‰ of molten steel weight and adds aluminium deoxidation, in ladle, adds the purification of molten steel agent by molten steel weight 3 ‰ when molten steel is come out of the stove, and tapping temperature is controlled in 1590 ~ 1610 ℃ of scopes;
Said casting die matched moulds pre-treatment and join the core matched moulds is earlier at external mold and whose surfaces brushing high-temperature resistant coating respectively, and joins the core matched moulds again after the drying of lighting a fire, and in 4 h, pours into a mould;
Said cast is that the pouring molten steel temperature is controlled in 1550 ~ 1600 ℃ of scopes; Cast finishes back 3 ~ 5s at interval, some cast gate and/or some open riser 1 ~ 2 time;
Said cleaning is the unpacking knockout of 6h after cast, after Shot Blasting, cuts off dead head, promptly gets said valve casing foundry goods.
In technique scheme, the present invention advocates, described purification of molten steel agent is a silico-calcium barium clad steel water scavengine agent, or silico-calcium clad steel water scavengine agent, or lanthanide rare molten steel water purification agent.The present invention is silico-calcium barium clad steel water scavengine agent preferably.
In technique scheme, the present invention advocates, described high-temperature resistant coating is a zirconium English powder high-temperature resistant coating, or the schmigel high-temperature resistant coating.The present invention is zirconium English powder high-temperature resistant coating preferably.
After technique scheme is able to implement; Casting die according to the invention is rational in infrastructure, layout is advanced; The easy easy control of casting technique according to the invention adopts the said valve casing casting quality of the present invention's casting good, can not produce casting flaws such as shrinkage porosite, shrinkage cavity and surperficial scab; Having avoided said valve casing finished product to press the characteristics such as generation of leakage problem, is conspicuous.
Description of drawings
Fig. 1 is that the master of valve casing foundry goods according to the invention looks sketch map, and ao shown in the figure is a pit,
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is the vertical view of Fig. 1;
Fig. 4 is the structural representation of casting die of the present invention;
Fig. 5 is that the B-B of Fig. 4 is to sketch map;
Fig. 6 is the schematic flow sheet of casting technique of the present invention.
The specific embodiment
Below contrast accompanying drawing, embodiment of the present invention is specifically described.
One of specific embodiment is like accompanying drawing 2, shown in 4 and please join and read accompanying drawing 5.
Low powered is with the casting die of diesel exhaust valve valve casing foundry goods in a kind of, and said casting die is the resin sand mo(u)ld, and its:
With the wicket 1 of said foundry goods and the longitudinal center line of big window 2 is die joint, constitutes upper and lower involutory upper impression resin sand mo(u)ld 3 and lower impressions resin sand mo(u)ld 4 respectively with phenolic sand molding;
Position, outer face at the said foundry goods flange die cavity 5 of said upper impression resin sand mo(u)ld 3 and lower impressions resin sand mo(u)ld 4 is furnished with contoured chill 6;
Drop on the core in the resin sand model cavity, comprise by resin sand through molded first core of getting 7 of core, second core 8, the 3rd core 9 and the 4th core 14; Between first core 7 and second core 8, connect fixing by the earthenware that meets said cast casting technological requirement 10; The other end of first core 7 and contoured chill 6 setting-in are mutually fixed, and an end setting-in of the other end of second core 8 and the 3rd core 9 is fixed, and the other end of the 3rd core and upper impression resin sand mo(u)ld 3 and lower impressions resin sand mo(u)ld 4 setting-in are mutually fixed; The 4th core 14 is fixed on the upper impression resin sand mo(u)ld 3;
Be positioned at the surface at the cone table 8-1 position of second core 8, be laid with chrome ore layer of sand 15;
The runner system that comprises sprue 11-1, cross gate 11-2 and ingate 11-3 is laid on the die joint of upper impression resin sand mo(u)ld 3 and lower impressions resin sand mo(u)ld 4; And the intersection of cross gate 11-2 and ingate 11-3 is provided with collection slag feeding blind riser 11-4;
Being used for the rising head of feeding is respectively first rising head 12 and second rising head 13; First rising head 12 is arranged in the upper impression resin sand mo(u)ld 3 directly over first core, 7 middle parts, and second rising head 13 is arranged in the upper impression resin sand mo(u)ld 3 that gets close to directly over said foundry goods wicket 1 core.Promptly be arranged in the wall thickness position of valve casing according to the invention.
The thickness of said contoured chill is 20 ~ 40mm; The height of said collection slag feeding blind riser 11-4 is 145 ~ 155mm; Said first rising head 12 and second rising head 13 are oval open riser of φ 80 * 120mm or heat preservation blind riser, and the thickness of said chrome ore layer of sand 15 is 15 ~ 20mm; Comprise also being located in the upper impression resin sand mo(u)ld 3 and being positioned at the steam vent 16 on said foundry goods flange die cavity 5 tops that the diameter of steam vent 16 is φ 8 ~ 15mm.
One of specific embodiment, described is the casting die of the said valve casing foundry goods of one case one mould.
Two of the specific embodiment is like accompanying drawing 2,4, shown in 5.
Low powered is with the casting die of diesel exhaust valve valve casing foundry goods in a kind of, and said casting die is the resin sand mo(u)ld, and its:
With the wicket 1 of said foundry goods and the longitudinal center line of big window 2 is die joint, constitutes upper and lower involutory upper impression resin sand mo(u)ld 3 and lower impressions resin sand mo(u)ld 4 respectively with phenolic sand molding;
Lateral surface position at the said foundry goods flange die cavity 5 of said upper impression resin sand mo(u)ld 3 and lower impressions resin sand mo(u)ld 4 is furnished with contoured chill 6;
Drop on the core in the resin sand model cavity, comprise by resin sand through molded first core of getting 7 of core, second core 8, the 3rd core 9 and the 4th core 14; Between first core 7 and second core 8, connect fixing by the earthenware that meets said cast casting technological requirement 10; The other end of first core 7 and contoured chill 6 setting-in are mutually fixed, and an end setting-in of the other end of second core 8 and the 3rd core 9 is fixed, and the other end of the 3rd core and upper impression resin sand mo(u)ld 3 and lower impressions resin sand mo(u)ld 4 setting-in are mutually fixed; The 4th core 14 is fixed on the upper impression resin sand mo(u)ld 3;
Be positioned at the surface at the cone table 8-1 position of second core 8, be laid with chrome ore layer of sand 15;
The runner system that comprises sprue 11-1, cross gate 11-2 and ingate 11-3 is laid on the die joint of upper impression resin sand mo(u)ld 3 and lower impressions resin sand mo(u)ld 4; And the intersection of cross gate 11-2 and ingate 11-3 is provided with collection slag feeding blind riser 11-4;
Being used for the rising head of feeding is respectively first rising head 12 and second rising head 13; First rising head 12 is arranged in the upper impression resin sand mo(u)ld 3 directly over first core, 7 middle parts, and second rising head 13 is arranged in the upper impression resin sand mo(u)ld 3 that gets close to directly over said foundry goods wicket 1 core.
The thickness of said contoured chill is 20 ~ 40mm; The height of said collection slag feeding blind riser 11-4 is 145 ~ 155mm; Said first rising head 12 and second rising head 13 are oval open riser of φ 80 * 120mm or heat preservation blind riser, and the thickness of said chrome ore layer of sand 15 is 15 ~ 20mm; Comprise also being located in the upper impression resin sand mo(u)ld 3 and being positioned at the steam vent 16 on said foundry goods flange die cavity 5 tops that the diameter of steam vent 16 is φ 8 ~ 15mm.
Said casting die is one case two mould, divides at a distance of 340 mm at least between 2 resin sand die cavity longitudinal center lines and open symmetric arrangement, and 2 resin sand model cavities each has ingate 11-3, and the sprue 11-1 of shared 1 runner system and cross gate 11-2.
Two of the specific embodiment, described is the casting die of the said valve casing foundry goods of one case two mould.Because 2 shared runner systems of casting die can reduce the materials of runner system, and improve finished casting rate.
Three of the specific embodiment is shown in accompanying drawing 6.
A kind ofly comprise batching like the casting technique of low powered in said with the diesel exhaust valve valve casing, melting, the pre-treatment of casting die matched moulds with join the core matched moulds, pour into a mould and clear up, and its:
With one of specific embodiment or two described casting dies be the pouring molten steel shaping mould;
Said batching is with mild steel waste material and stainless steel waste material and molybdenum-iron, by the chemical composition of said valve casing, carries out weighing and burden respectively;
Said melting is to adopt intermediate frequency furnace remelting furnace charge, before molten steel is come out of the stove, presses 1 ‰ of molten steel weight and adds the aluminium block deoxidation, in ladle, adds the purification of molten steel agent by molten steel weight 3 ‰ when molten steel is come out of the stove, and tapping temperature is controlled in 1590 ~ 1610 ℃ of scopes;
Said casting die matched moulds pre-treatment and join the core matched moulds is earlier at external mold and whose surfaces brushing high-temperature resistant coating respectively, and joins the core matched moulds again after the drying of lighting a fire, and in 4 h, pours into a mould;
Said cast is that the pouring molten steel temperature is controlled in 1550 ~ 1600 ℃ of scopes; Cast finishes back 3 ~ 5s at interval, some cast gate and/or some open riser 1 ~ 2 time;
Said cleaning is the unpacking knockout of 6h after cast, after Shot Blasting, cuts off dead head, promptly gets the valve casing foundry goods.
And said purification of molten steel agent is a silico-calcium barium clad steel water scavengine agent; Said high-temperature resistant coating is a zirconium English powder high-temperature resistant coating.
And the igniting that should be noted that the pre-treatment of said casting die matched moulds is dry, is behind the brushing high-temperature resistant coating; With the high-temperature resistant coating of brushing that ignite such as lighter on the casting die surface; Make it lose moisture content and drying, and in 4h, pour into a mould, to avoid also tide of high-temperature resistant coating moisture absorption.Said some cast gate and/or some open riser are jargons in the industry, and hole irrigation is teeming.
Lab scale of the present invention and pilot scale effect are good.For homemade said valve casing provides support.

Claims (6)

1. the casting die of a marine diesel air bleeding valve valve casing foundry goods, said casting die is the resin sand mo(u)ld, it is characterized in that:
With the wicket (1) of said foundry goods and the longitudinal center line of big window (2) is die joint, constitutes upper and lower involutory upper impression resin sand mo(u)ld (3) and lower impressions resin sand mo(u)ld (4) respectively with phenolic sand molding;
Position, outer face at the said foundry goods flange die cavity (5) of said upper impression resin sand mo(u)ld (3) and lower impressions resin sand mo(u)ld (4) is furnished with contoured chill (6);
Drop on the core in the resin sand model cavity, comprise by resin sand through molded first core of getting (7) of core, second core (8), the 3rd core (9) and the 4th core (14); Between first core (7) and second core (8), connect fixing by the earthenware that meets said cast casting technological requirement (10); The other end of first core (7) and contoured chill (6) setting-in are mutually fixed; One end setting-in of the other end of second core (8) and the 3rd core (9) is fixed, and the other end of the 3rd core and upper impression resin sand mo(u)ld (3) and lower impressions resin sand mo(u)ld (4) setting-in are mutually fixed; The 4th core (14) is fixed on the upper impression resin sand mo(u)ld (3);
Be positioned at the surface at cone table (8-1) position of second core (8), be laid with chrome ore layer of sand (15);
The runner system that comprises sprue (11-1), cross gate (11-2) and ingate (11-3) is laid on the die joint of upper impression resin sand mo(u)ld (3) and lower impressions resin sand mo(u)ld (4); And cross gate (11-2) is provided with collection slag feeding blind riser (11-4) with the intersection of ingate (11-3);
Being used for the rising head of feeding is respectively first rising head (12) and second rising head (13); First rising head (12) is arranged in the upper impression resin sand mo(u)ld (3) directly over first core (7) middle part, and second rising head (13) is arranged in the upper impression resin sand mo(u)ld (3) that gets close to directly over said foundry goods wicket (1) core.
2. casting die according to claim 1; It is characterized in that; The thickness of said contoured chill is 20 ~ 40mm; The height of said collection slag feeding blind riser (11-4) is 145 ~ 155mm, and said first rising head (12) and second rising head (13) are oval open riser of φ 80 * 120mm or heat preservation blind riser, and the thickness of said chrome ore layer of sand (15) is 15 ~ 20mm; Comprise also being located in the upper impression resin sand mo(u)ld (3) and being positioned at the steam vent (16) on said foundry goods flange die cavity (5) top that the diameter of steam vent (16) is φ 8 ~ 15mm.
3. casting die according to claim 1; It is characterized in that; Said casting die is one case two mould; At least divide at a distance of 340 mm between 2 resin sand die cavity longitudinal center lines and open symmetric arrangement, and 2 resin sand model cavities each have ingate (11-3), and sprue of shared 1 runner system (11-1) and cross gate (11-2).
4. the casting technique of valve casing according to claim 1 comprises batching, melting, and casting die matched moulds pre-treatment and join the core matched moulds, cast and cleaning is characterized in that:
With casting die according to claim 1 is the pouring molten steel shaping mould;
Said batching is with mild steel waste material and stainless steel waste material and molybdenum-iron, by the chemical composition of said valve casing, carries out weighing and burden respectively;
Said melting is to adopt intermediate frequency furnace remelting furnace charge, before molten steel is come out of the stove, presses 1 ‰ aluminum deoxidations of molten steel weight, in ladle, adds the purification of molten steel agent by molten steel weight 3 ‰ when molten steel is come out of the stove, and tapping temperature is controlled in 1590 ~ 1610 ℃ of scopes;
Said casting die matched moulds pre-treatment and join the core matched moulds is earlier at external mold and whose surfaces brushing high-temperature resistant coating respectively, and joins the core matched moulds again after the drying of lighting a fire, and in 4 h, pours into a mould;
Said cast is that the pouring molten steel temperature is controlled in 1550 ~ 1600 ℃ of scopes; Cast finishes back 3 ~ 5s at interval, some cast gate and/or some open riser 1 ~ 2 time;
Said cleaning is the unpacking knockout of 6h after cast, after Shot Blasting, cuts off dead head, promptly gets the valve casing foundry goods.
5. the casting technique of valve casing according to claim 4 is characterized in that, described purification of molten steel agent is a silico-calcium barium clad steel water scavengine agent, or silico-calcium clad steel water scavengine agent, or lanthanide rare molten steel water purification agent.
6. the casting technique of valve casing according to claim 4 is characterized in that, described high-temperature resistant coating is a zirconium English powder high-temperature resistant coating, or the schmigel high-temperature resistant coating.
CN 201110330989 2010-10-28 2011-10-27 Casting die for valve shell casting of marine diesel engine and casting process of valve shell CN102463326B (en)

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CN 201010523326 CN101947641A (en) 2010-10-28 2010-10-28 Casting process of valve casing
CN201010523326.4 2010-10-28
CN 201110330989 CN102463326B (en) 2010-10-28 2011-10-27 Casting die for valve shell casting of marine diesel engine and casting process of valve shell

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CN102463326B CN102463326B (en) 2013-06-19

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