CN109108221A - The production technology of fast opening and closing power station exhaust check valve casting - Google Patents
The production technology of fast opening and closing power station exhaust check valve casting Download PDFInfo
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- CN109108221A CN109108221A CN201811134488.1A CN201811134488A CN109108221A CN 109108221 A CN109108221 A CN 109108221A CN 201811134488 A CN201811134488 A CN 201811134488A CN 109108221 A CN109108221 A CN 109108221A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/086—Filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C11/00—Selection of abrasive materials or additives for abrasive blasts
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses the production technologies of fast opening and closing power station exhaust check valve casting, include the following steps: step 1, and mold prepares；Step 2 toasts feeding；Mould is matched in step 3, mould assembling；Step 4, alloy melting；Step 5, pouring molten steel；Step 6, processing of unpacking；Step 7, heat treating castings；Step 8, finishing storage；Wherein in above-mentioned step one, according to the design feature of check-valves part, technical requirements, production batch and working condition, sand core is produced using casting model powder and moulding sand binder, the model of casting is prepared；The present invention, process advantages of simple, during production, by strictly being adjusted to sand mould, the defects of capable of effectively avoiding sand holes, stomata and shrinkage porosite, by carrying out multiple refine polishing to casting, it can be effectively smooth by the fold of cast(ing) surface, so that cast(ing) surface is smooth, the dimensional accuracy of casting is improved, scrappage is reduced.
Description
Technical field
The present invention relates to valve casting technology fields, specially the production work of fast opening and closing power station exhaust check valve casting
Skill.
Background technique
Fast opening and closing power station exhaust check valve is used for power plant or the steam and water of steam power plant's extract system or other systems etc.
On non-aggressive medium pipeline, the safe operation of steam turbine can be protected.
During production, the method for casting is generallyd use to produce exhaust check valve, production work in the prior art
Skill, complex procedures, operation difficulty is big, during production, the problem of being easy to appear scab, and during subsequent casting, shadow
Casting quality is rung, so that the defects of valve castings are easy to appear sand holes, stomata and shrinkage porosite, causes the scrappage of casting higher, sternly
Ghost image rings the service life of valve, meanwhile, for casting after casting complete, processing is more coarse, so that valve castings surface occurs
Polishing trace, seriously affects the process of surface smoothness and valve castings, and therefore, design fast opening and closing power station exhaust is stopped
It is necessary for returning the production technology of valve casting.
Summary of the invention
The purpose of the present invention is to provide the production technologies of fast opening and closing power station exhaust check valve casting, to solve above-mentioned back
The problem of being proposed in scape technology.
To achieve the above object, the invention provides the following technical scheme:
The production technology of fast opening and closing power station exhaust check valve casting, includes the following steps: step 1, and mold prepares；Step
Rapid two, toast feeding；Mould is matched in step 3, mould assembling；Step 4, alloy melting；Step 5, pouring molten steel；Step 6, unpack place
Reason；Step 7, heat treating castings；Step 8, finishing storage；
Wherein in above-mentioned step one, according to the design feature of check-valves part, technical requirements, production batch and production
Sand core is produced using casting model powder and moulding sand binder, the model of casting is prepared, and open up pour in a model by condition
Geat selects suitable sprue gate, there is very big shadow in this position to casting quality according to casting the location of in casting mold
It rings, pouring position is selected the significant points of casting and the position of defect should be also easy to produce to be placed on best position, and by mold
It is put into molding sand box, obtains sand mold；
Wherein in above-mentioned step two, sand mold obtained in step 1 and sand core are subjected to baking processing, selection is suitable
Coating brushed on the surface of sand mold and sand core, brushing paint can effectively prevent casting after industrial absolute alcohol dilution is added
There is stomata, avoids scab, during brushing, piling should be avoided, influence casting dimension, meanwhile, coating application is complete
Cheng Hou carries out drying and processing again；
Wherein in above-mentioned step three, remove sand mold and sand core surface floating sand, check sand mold, sand core type chamber and
Outlet duct avoids outlet duct from being blocked, and lower sand core assembles the sand mold prepared and sand core, when lower core, it is ensured that sand core
Fixation and exhaust, the conjunction of upper and lower sand mold is set, the aperture of sprue cup is directed at sprue gate, upper and lower sand mold is clamped, to complete
Assembly；During assembly, sand mold can be fixed by placing stud and chill core, stud and chill core in the inside of sand mold,
Guarantee wall thickness；
Wherein in above-mentioned step four, molten steel material is mingled with by fusing, refining, removal harmful element and removing
Object adjusts the chemical component in molten steel by deoxidation degasification, to be made, chemical component is qualified, deoxidation is good, field trash and gas
Content is few and has the liquid alloy of certain temperature, good fluidity；
Wherein in above-mentioned step five, the roasting of certain temperature is carried out to sand mold, suitable pouring temperature is selected, is pouring
During note, in the good situation of Filling Processes of Castings, can be suitable for reduce pouring temperature, meanwhile, select suitable poring rate,
During casting, deslagging agent and heat preserving agent should be added, abundant overflow is should be noted that in casting, puts dead head when necessary, add
Workpiece after casting-up, is placed on room temperature and carries out ageing treatment for a period of time by strong feeding；
Wherein in above-mentioned step six, the sand mold in step 5 after Wetted constructures is taken out, after opening casting
Sand mold takes out casting, and casting should in time dispose the molding sand of cast(ing) surface and inner cavity after taking out, and removal arbor and casting
After the completion of sand removal, dead head is cut off for the chill on surface, meanwhile, the casting muscle retained will not needed and taken out, dead head is being cut off
When, riser root residual quantity cannot be excessive, can not be cut into cast-internal, after the completion of cutting, first ball blast is carried out to casting, into
One step removes the scab of cast(ing) surface, so that the surface defect of casting is exposed, after the completion of first ball blast, carries out at carbon plane
Defect is excavated completely, carries out soldering by reason, and the position of soldering should be polishing to the original shape and size of casting by postwelding；
Wherein in above-mentioned step seven, will by unpacking, treated that casting is heat-treated in step 6, by casting
It is placed in heat-treatment furnace, carries out annealing and normalized treatment, after the completion of processing, casting is transferred in cooling pond and is quenched
Casting is again placed in heat-treatment furnace after being quenched and carries out tempering by processing, by being heat-treated casting
Metallographic structure changes, and eliminates the internal stress of casting, thus machinability required for obtaining and service performance；
Wherein in above-mentioned step eight, the casting after Overheating Treatment is subjected to secondary Shot Blasting, thus by heat
The oxide layer that cast(ing) surface generates when reason removes, and after the completion of secondary Shot Blasting, carries out finishing to the surface of casting, repairs casting
The defect on surface should lack soldering and few polishing during finishing, to guarantee the surface smoothness and casting of casting
Process, after the completion of finishing, again to casting carry out Shot Blasting three times, thus by after finishing cast(ing) surface generate trace
Mark removes, and three times after the completion of Shot Blasting, to the external coating antirust oil of casting, after the completion of antirust treatment, casting is carried out matter
Check in library.
According to the above technical scheme, in the step 1, the temperature of sand mold is 600-700 DEG C.
According to the above technical scheme, in the step 2, the coating selected is a kind of Zircon powder alcohol group dope；And coating dries
Dry temperature is 150-180 DEG C.
According to the above technical scheme, in the step 3, the internal engagement of sprue cup is equipped with filter screen.
According to the above technical scheme, in the step 4, molten steel material includes steel scrap, alloy, carburant, deoxidier, mine
Stone and slag making materials.
According to the above technical scheme, in the step 5, the time of ageing treatment is 48h.
According to the above technical scheme, in the step 6, first ball blast is 2-2.5mm using the diameter of coarse grain ball blast, is thrown
The ball time is 10-15min.
According to the above technical scheme, in the step 8, secondary ball blast and three times ball blast use the diameter of coarse grain ball blast
For 0.5-1.5mm, the ball blast time is 15-20min.
Compared with prior art, the beneficial effects of the present invention are: it is of the invention, process advantages of simple, during production,
By strictly being adjusted to sand mould, the defects of capable of effectively avoiding sand holes, stomata and shrinkage porosite, carries out the place that unpacks to casting
Reason and finishing processing, so that the defect on the surface of valve castings is removed, so that the fold by cast(ing) surface is smooth, so that casting
Part surface is smooth, improves the dimensional accuracy of casting, reduces scrappage；And heat treating castings have been carried out to valve, by casting
Metallographic structure change, eliminate the internal stress of casting, improve the hardness and strength of valve castings, machining required for obtaining
Performance and service performance, meanwhile, antirust treatment is carried out to valve castings, so that there is valve castings certain antirust to imitate
Fruit.
Detailed description of the invention
Fig. 1 is production technological process of the invention；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of technical solution: the production work of fast opening and closing power station exhaust check valve casting
Skill, includes the following steps: step 1, and mold prepares；Step 2 toasts feeding；Mould is matched in step 3, mould assembling；Step 4, alloy are molten
Refining；Step 5, pouring molten steel；Step 6, processing of unpacking；Step 7, heat treating castings；Step 8, finishing storage；
Wherein in above-mentioned step one, according to the design feature of check-valves part, technical requirements, production batch and production
Sand core is produced using casting model powder and moulding sand binder, the model of casting is prepared, and open up pour in a model by condition
Geat selects suitable sprue gate, there is very big shadow in this position to casting quality according to casting the location of in casting mold
It rings, pouring position is selected the significant points of casting and the position of defect should be also easy to produce to be placed on best position, and by mold
It is put into molding sand box, obtains sand mold；
Wherein in above-mentioned step two, sand mold obtained in step 1 and sand core are subjected to baking processing, selection is suitable
Coating brushed on the surface of sand mold and sand core, brushing paint can effectively prevent casting after industrial absolute alcohol dilution is added
There is stomata, avoids scab, during brushing, piling should be avoided, influence casting dimension, meanwhile, coating application is complete
Cheng Hou carries out drying and processing again；
Wherein in above-mentioned step three, remove sand mold and sand core surface floating sand, check sand mold, sand core type chamber and
Outlet duct avoids outlet duct from being blocked, and lower sand core assembles the sand mold prepared and sand core, when lower core, it is ensured that sand core
Fixation and exhaust, the conjunction of upper and lower sand mold is set, the aperture of sprue cup is directed at sprue gate, upper and lower sand mold is clamped, to complete
Assembly；During assembly, sand mold can be fixed by placing stud and chill core, stud and chill core in the inside of sand mold,
Guarantee wall thickness；
Wherein in above-mentioned step four, molten steel material is mingled with by fusing, refining, removal harmful element and removing
Object adjusts the chemical component in molten steel by deoxidation degasification, to be made, chemical component is qualified, deoxidation is good, field trash and gas
Content is few and has the liquid alloy of certain temperature, good fluidity；
Wherein in above-mentioned step five, the roasting of certain temperature is carried out to sand mold, suitable pouring temperature is selected, is pouring
During note, in the good situation of Filling Processes of Castings, can be suitable for reduce pouring temperature, meanwhile, select suitable poring rate,
During casting, deslagging agent and heat preserving agent should be added, abundant overflow is should be noted that in casting, puts dead head when necessary, add
Workpiece after casting-up, is placed on room temperature and carries out ageing treatment for a period of time by strong feeding；
Wherein in above-mentioned step six, the sand mold in step 5 after Wetted constructures is taken out, after opening casting
Sand mold takes out casting, and casting should in time dispose the molding sand of cast(ing) surface and inner cavity after taking out, and removal arbor and casting
After the completion of sand removal, dead head is cut off for the chill on surface, meanwhile, the casting muscle retained will not needed and taken out, dead head is being cut off
When, riser root residual quantity cannot be excessive, can not be cut into cast-internal, after the completion of cutting, first ball blast is carried out to casting, into
One step removes the scab of cast(ing) surface, so that the surface defect of casting is exposed, after the completion of first ball blast, carries out at carbon plane
Defect is excavated completely, carries out soldering by reason, and the position of soldering should be polishing to the original shape and size of casting by postwelding；
Wherein in above-mentioned step seven, will by unpacking, treated that casting is heat-treated in step 6, by casting
It is placed in heat-treatment furnace, carries out annealing and normalized treatment, after the completion of processing, casting is transferred in cooling pond and is quenched
Casting is again placed in heat-treatment furnace after being quenched and carries out tempering by processing, by being heat-treated casting
Metallographic structure changes, and eliminates the internal stress of casting, thus machinability required for obtaining and service performance；
Wherein in above-mentioned step eight, the casting after Overheating Treatment is subjected to secondary Shot Blasting, thus by heat
The oxide layer that cast(ing) surface generates when reason removes, and after the completion of secondary Shot Blasting, carries out finishing to the surface of casting, repairs casting
The defect on surface should lack soldering and few polishing during finishing, to guarantee the surface smoothness and casting of casting
Process, after the completion of finishing, again to casting carry out Shot Blasting three times, thus by after finishing cast(ing) surface generate trace
Mark removes, and three times after the completion of Shot Blasting, to the external coating antirust oil of casting, after the completion of antirust treatment, casting is carried out matter
Check in library.
According to the above technical scheme, in step 1, the temperature of sand mold is 600-700 DEG C, can be convenient for being poured.
According to the above technical scheme, in step 2, the coating selected is a kind of Zircon powder alcohol group dope；And coating drying
Temperature is 150-180 DEG C, can effectively prevent scab.
According to the above technical scheme, in step 3, the internal engagement of sprue cup is equipped with filter screen, can be improved skimming effect
Fruit.
According to the above technical scheme, in step 4, molten steel material include steel scrap, alloy, carburant, deoxidier, ore with
And slag making materials, material purchases are cheap, can be effectively reduced the production cost of valve.
According to the above technical scheme, in step 5, the time of ageing treatment is 48h, can be improved the hardness of valve castings
And intensity, reduce the plasticity toughness and internal stress of valve castings.
According to the above technical scheme, in step 6, first ball blast is 2-2.5mm using the diameter of coarse grain ball blast, when ball blast
Between be 10-15min, can be improved ball blast effect, thus by casting surface defect exposure.
According to the above technical scheme, in step 8, secondary ball blast and three times ball blast are using the diameter of coarse grain ball blast
0.5-1.5mm, ball blast time are 15-20min, can be improved ball blast effect, so that the surface of valve castings is carried out smooth beat
Mill.
Based on above-mentioned, it is an advantage of the current invention that it is of the invention, according to the design feature, technical requirements, life of check-valves part
Batch and working condition are produced, sand core is produced using casting model powder and moulding sand binder, the model of casting is prepared, and
Sprue gate is opened up in model, according to casting the location of in casting mold, selects suitable sprue gate, this position is to casting matter
Amount has a significant impact, and pouring position is selected the significant points of casting should to be placed on best position with the position for being also easy to produce defect
It sets, and mold is put into molding sand box, obtain sand mold, the temperature of sand mold is 600-700 DEG C, can be convenient for being poured；It will system
The sand mold and sand core obtained carries out baking processing, selects suitable coating, the coating selected is a kind of Zircon powder alcohol group dope；And it applies
The temperature of material drying is 150-180 DEG C, can effectively prevent scab, after industrial absolute alcohol dilution is added, is brushed in sand mold
With the surface of sand core, brushing paint can effectively prevent casting stomata occur, avoid scab, during brushing, should be avoided
Piling influences casting dimension, meanwhile, after the completion of coating application, drying and processing is carried out again；Remove sand mold and sand core surface
Floating sand, check sand mold, sand core type chamber and outlet duct, avoid outlet duct be blocked, lower sand core, the sand that will be prepared
Type and sand core assembly, when lower core, it is ensured that the conjunction of upper and lower sand mold is set, the aperture of sprue cup is aligned by the fixation and exhaust of sand core
The internal engagement at sprue gate, sprue cup is equipped with filter screen, can be improved skimming effect, and upper and lower sand mold is clamped, to complete
Assembly；During assembly, sand mold can be fixed by placing stud and chill core, stud and chill core in the inside of sand mold,
Guarantee wall thickness；Molten steel material includes steel scrap, alloy, carburant, deoxidier, ore and slag making materials, and material purchases are cheap, energy
The production cost of valve is enough effectively reduced, molten steel material by fusing, refining, removal harmful element and is removed into field trash,
The chemical component in molten steel is adjusted by deoxidation degasification, chemical component is qualified, deoxidation is good, field trash and gas content to be made
Less and there is the liquid alloy of certain temperature, good fluidity；The roasting of certain temperature is carried out to sand mold, selects suitable casting temperature
Degree, during casting, in the good situation of Filling Processes of Castings, can be suitable for reduce pouring temperature, meanwhile, select suitable casting
Speed should add deslagging agent and heat preserving agent during casting, should be noted that abundant overflow in casting, when necessary hole irrigation
Riser reinforces feeding, after casting-up, workpiece is placed on room temperature and carries out ageing treatment, the time of ageing treatment for a period of time
It for 48h, can be improved the hardness and strength of valve castings, reduce the plasticity toughness and internal stress of valve castings；It will be through overaging
Treated sand mold takes out, the sand mold after opening casting, takes out casting, and casting should be in time by cast(ing) surface and inner cavity after taking out
Molding sand is disposed, and the chill of removal arbor and cast(ing) surface, and after the completion of sand removal, dead head is cut off, meanwhile, it will not need
The casting muscle of reservation takes out, and when cutting off dead head, riser root residual quantity cannot be excessive, can not be cut into cast-internal, cuts
After the completion, first ball blast is carried out to casting, first ball blast is 2-2.5mm using the diameter of coarse grain ball blast, and the ball blast time is 10-
15min can be improved ball blast effect, the scab of cast(ing) surface further be removed, so that the surface defect of casting is exposed, just
After the completion of secondary ball blast, the processing of carbon plane is carried out, defect is excavated completely, soldering is carried out, the position of soldering should be polishing to casting by postwelding
The original shape and size of part；Will by unpacking, treated that casting is heat-treated, casting is placed in heat-treatment furnace, into
Row annealing and normalized treatment, after the completion of processing, casting are transferred in cooling pond and is quenched, after being quenched
Afterwards, casting is again placed in heat-treatment furnace and carries out tempering, changed the metallographic structure of casting by being heat-treated, eliminated
The internal stress of casting, thus machinability required for obtaining and service performance；Casting after Overheating Treatment is carried out
Secondary Shot Blasting, to the oxide layer that cast(ing) surface when heat treatment generates be removed, after the completion of secondary Shot Blasting, to casting
Surface carry out finishing, repair the defect of cast(ing) surface, during finishing, soldering and few polishing should be lacked, to guarantee
The surface smoothness of casting and the process of casting after the completion of finishing, carry out Shot Blasting three times to casting again, thus
Cast(ing) surface after finishing is generated trace to remove, three times after the completion of Shot Blasting, to the external coating antirust oil of casting, antirust
After the completion of processing, casting is subjected to quality inspection storage, secondary ball blast and three times ball blast are 0.5- using the diameter of coarse grain ball blast
1.5mm, ball blast time are 15-20min, can be improved ball blast effect, so that the surface of valve castings is carried out smooth polishing；This
Invention, process advantages of simple, during production, by strictly being adjusted to sand mould, can effectively avoid sand holes,
The defects of stomata and shrinkage porosite, can be effectively smooth by the fold of cast(ing) surface by carrying out multiple refine polishing to casting, so that
Cast(ing) surface is smooth, improves the dimensional accuracy of casting, reduces scrappage.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (8)
1. the production technology of fast opening and closing power station exhaust check valve casting, includes the following steps: step 1, mold prepares；Step
Two, toast feeding；Mould is matched in step 3, mould assembling；Step 4, alloy melting；Step 5, pouring molten steel；Step 6, processing of unpacking；
Step 7, heat treating castings；Step 8, finishing storage；It is characterized by:
Wherein in above-mentioned step one, according to the design feature of check-valves part, technical requirements, production batch and production item
Sand core is produced using casting model powder and moulding sand binder, the model of casting is prepared, and open up casting in a model by part
Mouthful, according to casting the location of in casting mold, suitable sprue gate is selected, this position has a significant impact to casting quality,
The significant points of casting should be placed on best position with the position for being also easy to produce defect by selection pouring position, and mold is put into
In molding sand box, sand mold is obtained；
Wherein in above-mentioned step two, sand mold obtained in step 1 and sand core are subjected to baking processing, select suitable apply
Material is brushed on the surface of sand mold and sand core, brushing paint can effectively prevent casting to occur after industrial absolute alcohol dilution is added
Stomata avoids scab, and during brushing, piling should be avoided, and influences casting dimension, meanwhile, after the completion of coating application,
Drying and processing is carried out again；
Wherein in above-mentioned step three, the floating sand of sand mold and sand core surface is removed, checks the type chamber and outlet of sand mold, sand core
Duct avoids outlet duct from being blocked, and lower sand core assembles the sand mold prepared and sand core, when lower core, it is ensured that sand core is consolidated
Fixed and exhaust, the conjunction of upper and lower sand mold is set, and the aperture of sprue cup is directed at sprue gate, upper and lower sand mold is clamped, to complete to assemble；
During assembly, sand mold can be fixed by placing stud and chill core, stud and chill core in the inside of sand mold, guarantee wall
It is thick；
Wherein in above-mentioned step four, molten steel material by fusing, refining, removal harmful element and is removed into field trash,
The chemical component in molten steel is adjusted by deoxidation degasification, chemical component is qualified, deoxidation is good, field trash and gas content to be made
Less and there is the liquid alloy of certain temperature, good fluidity；
Wherein in above-mentioned step five, the roasting of certain temperature is carried out to sand mold, suitable pouring temperature is selected, in casting
In the process, in the good situation of Filling Processes of Castings, can be suitable for reduce pouring temperature, meanwhile, select suitable poring rate, be poured
During, deslagging agent and heat preserving agent should be added, abundant overflow is should be noted that in casting, puts dead head when necessary, reinforces mending
Contracting, after casting-up, is placed on room temperature for workpiece and carries out ageing treatment for a period of time；
Wherein in above-mentioned step six, the sand mold in step 5 after Wetted constructures is taken out, the sand mold after opening casting,
Casting is taken out, casting should in time dispose the molding sand of cast(ing) surface and inner cavity after taking out, and removal arbor and cast(ing) surface
Chill, after the completion of sand removal, dead head is cut off, meanwhile, will not need retain casting muscle take out, when cutting off dead head, emit
Mouth root residual quantity cannot be excessive, can not be cut into cast-internal, after the completion of cutting, carries out first ball blast to casting, further
The scab of cast(ing) surface is removed, so that the surface defect of casting is exposed, after the completion of first ball blast, carries out the processing of carbon plane, it will
Defect is excavated completely, and soldering is carried out, and the position of soldering should be polishing to the original shape and size of casting by postwelding；
Wherein in above-mentioned step seven, will by unpacking, treated that casting is heat-treated in step 6, casting is placed
In heat-treatment furnace, annealing and normalized treatment are carried out, after the completion of processing, casting is transferred in cooling pond and is carried out at quenching
Casting is again placed in heat-treatment furnace after being quenched and carries out tempering by reason, by being heat-treated the gold of casting
Phase constitution changes, and eliminates the internal stress of casting, thus machinability required for obtaining and service performance；
Wherein in above-mentioned step eight, the casting after Overheating Treatment is subjected to secondary Shot Blasting, thus when will be heat-treated
The oxide layer that cast(ing) surface generates removes, and after the completion of secondary Shot Blasting, carries out finishing to the surface of casting, repairs cast(ing) surface
Defect should lack soldering and few polishing during finishing, to guarantee the surface smoothness of casting and the work of casting
Skill size after the completion of finishing, carries out Shot Blasting three times to casting again, removes so that the cast(ing) surface after finishing is generated trace
It goes, three times after the completion of Shot Blasting, to the external coating antirust oil of casting, after the completion of antirust treatment, casting progress quality inspection is entered
Library.
2. the production technology of fast opening and closing power station exhaust check valve casting according to claim 1, it is characterised in that: described
In step 1, the temperature of sand mold is 600-700 DEG C.
3. the production technology of fast opening and closing power station exhaust check valve casting according to claim 1, it is characterised in that: described
In step 2, the coating selected is a kind of Zircon powder alcohol group dope；And the temperature of coating drying is 150-180 DEG C.
4. the production technology of fast opening and closing power station exhaust check valve casting according to claim 1, it is characterised in that: described
In step 3, the internal engagement of sprue cup is equipped with filter screen.
5. the production technology of fast opening and closing power station exhaust check valve casting according to claim 1, it is characterised in that: described
In step 4, molten steel material includes steel scrap, alloy, carburant, deoxidier, ore and slag making materials.
6. the production technology of fast opening and closing power station exhaust check valve casting according to claim 1, it is characterised in that: described
In step 5, the time of ageing treatment is 48h.
7. the production technology of fast opening and closing power station exhaust check valve casting according to claim 1, it is characterised in that: described
In step 6, first ball blast is 2-2.5mm using the diameter of coarse grain ball blast, and the ball blast time is 10-15min.
8. the production technology of fast opening and closing power station exhaust check valve casting according to claim 1, it is characterised in that: described
In step 8, secondary ball blast and three times ball blast are 0.5-1.5mm using the diameter of coarse grain ball blast, and the ball blast time is 15-
20min。
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