CN108838325A - A kind of method that ultrasonic wave added V method casts municipal manhole cover - Google Patents
A kind of method that ultrasonic wave added V method casts municipal manhole cover Download PDFInfo
- Publication number
- CN108838325A CN108838325A CN201810977721.6A CN201810977721A CN108838325A CN 108838325 A CN108838325 A CN 108838325A CN 201810977721 A CN201810977721 A CN 201810977721A CN 108838325 A CN108838325 A CN 108838325A
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- China
- Prior art keywords
- added
- ultrasonic wave
- manhole cover
- casts
- film
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Classifications
-
- 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
-
- 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
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
- C21C1/105—Nodularising additive agents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
Abstract
The invention discloses a kind of methods that ultrasonic wave added V method casts municipal manhole cover, difficulty of processing is reduced compared with conventional wet coating technique, saves sand core quantity, save the cost, the complexity for mitigating technological operation, reduces the casting flaws such as scab, stomata, sand holes, the sand that rises；Ultrasonication is added in the present invention in the pig iron fusion process during nodularization, and cavitation effect occurs, and it is slower that ultrasonic vibration also declines the temperature of surrounding liquid, so dendritic growth is slow, forms short and thick graphite bar；Also apply ultrasound during solidifying after being cast simultaneously, the sound cavitation effect and fuel factor of ultrasound keep casting cooling slow, thus the carbon conditional pass in the carbon poor layer and solution in embassy's body spreads and reaches balance, so manufactured Graphite in Cast Iron ingredient is uniform in size, and rounding rate is high, ferrite content is also low, so the comprehensive mechanical property of magnesium iron is improved, the nodular cast iron well lid prepared by has good mechanical property.
Description
Technical field
The present invention relates to inspection well cover manufacturing technology fields more particularly to a kind of ultrasonic wave added V method to cast municipal manhole cover
Method.
Background technique
With the fast development of modern science and technology and social economy, urban construction is gradually accelerated, and city size is constantly expanding,
Different kinds of roads facility progresses into regulation and standardization management, and many pipelines, cable step into underground pipe network, thus well lid
Market demand in urban planning and road construction increases.Since well lid is the closing towards at the top of underground installation entrance
Object, the public utilities such as all urban roads, highway, tap water, draining, telecommunications, electric power, fire hydrant, valve require to pacify
Fill well lid.Mostly be armored concrete before well lid material therefor, but due to armored concrete enbrittle it is big, easy to aging, easy
The defects of fracture and replaced the materials such as cast iron, spheroidal graphite cast-iron.Spheroidal graphite cast-iron is one kind of cast iron, and spheroidal graphite cast-iron is by ink
Change a kind of treated cast iron.Ductile cast iron manhole cover compared with plain cast iron well lid, easily get rusty, on weight bearing power by its brittleness
It makes moderate progress, therefore usage amount is increasing.
The well lid casting producer of most of the country produces well lid and walling crib using traditional green casting technique
Casting.The casting that green casting cast comes out has the castings such as scab, rat-tail, scab, stomata, sand holes, the sand that rises to lack
It falls into, the visual quality of casting is poor compared with V method technique, and the well lid of green casting and walling crib casting subsequent machining cost are high
The problems such as it is also more serious.Well lid use scope is extensive, and the requirement according to each place is different, selects different uses
Grade.It is gone to manufacture corresponding well lid product according to the requirement of different user, meets different kinds of roads, the requirement in place,
Ensure the safety that well lid is used for a long time in harsh environment.The available best utilization of material in this way, avoids resource
Waste.V method casting technique carrys out moulding using the dry sand without containing any binder and additive, dry sand from a wealth of sources and
It can recycle repeatedly, greatly reduce moulding cost.Using V method cast come out casting of appearance of cast forming, casting
Any surface finish, clear-cut size are accurate, and the cost and labor intensity of the subsequent machining cleaning of worker greatly reduces,
However there are the various normal problems of V method casting in the practical well lid walling crib in casting process, such as：It is misrun, cold
Every casting flaws such as line, cold shut, scabs, this just needs to carry out modified accordingly to technique in casting process or handle, keeps away
Exempt from the generation of defect.
Summary of the invention
The object of the invention is to remedy the disadvantages of known techniques, provides a kind of ultrasonic wave added V method casting municipal administration inspection
The method of well lid.
The present invention is achieved by the following technical solutions：
A kind of method that ultrasonic wave added V method casts municipal manhole cover, including step in detail below：
（1）With the loose sand of compressed air cleaning die surface before overlay film, keep the clean foreign of eva film without breakage, by roasting film
Device, which is moved to, takes film station to grab film, starts roasting diaphragm, resistive heater controls certain temperature, when film is in sagging mistake
When slowly becoming translucent in journey, overlay film is carried out, in coating process, the position that dead head root is difficult to overlay film can be with human assistance
Overlay film closes film mulching device vacuum after film is adsorbed on mold completely；
（2）Dry powder mould wash is configured, prepared coating, which is placed into, to be started to stir in agitator, controls nozzle diameter and spray
Coating is sprayed to precoated sand surface by pot supply gas pressure, controls thickness between 1-1.5mm, the thickness near riser is a little higher than
Other positions utilize heated-air drying 90-100 seconds after spraying, then detain case sand loading, using mechanical jolt ramming, check sandbox four
Whether all films have been fixed with sandbox side wall, and rear mould assembling is fixed in upper mo(u)ld bottom half；
（3）The pig iron is configured to certain nodulizer and inovulant according to a certain percentage, a miniature resistance furnace is put into ball
Change packet chamber preheats nodularization packet in rising, and 800 DEG C of temperature control or so, while smelting molten iron, temperature carry out when reaching 1450-1480 DEG C
Come out of the stove, configured nodulizer and inovulant be once added, rear-inclined electric furnace molten iron is poured into nodularization packet, use simultaneously
Long graphite probe, is added ultrasonic treatment certain time in nodularization packet；
（4）By step（3）It is poured after reaction, checks sand mold control in the negative pressure of 0.05MPa-0.06MPa before pouring
Under the conditions of, continue to add long graphite probe after casting complete in type chamber and be ultrasonically treated, is transported to through supercooling transfer car(buggy)
Cooling on cooling roller bed, casting mold after cooling is transported to solution case position and carries out solution case, and casting well lid is obtained after knockout.
A kind of method that ultrasonic wave added V method casts municipal manhole cover, step（1）Described controls certain temperature, is
Accuse 80-120 DEG C of temperature.
A kind of method that ultrasonic wave added V method casts municipal manhole cover, step（2）The configuration dry powder mould wash,
Specially spraying the previous day impregnates, and the alcohol that the concentration of 2 times of amounts is 75% is added before moulding.
A kind of method that ultrasonic wave added V method casts municipal manhole cover, step（2）The control nozzle diameter and spray
Pot supply gas pressure, specially control nozzle diameter 3.5-4mm, between watering can supply gas pressure 0.4MPa-0.6MPa.
A kind of method that ultrasonic wave added V method casts municipal manhole cover, step（3）Described will give birth to according to a certain percentage
Iron configures certain nodulizer and inovulant, and 0.35 kilogram of nodulizer and 0.21 specially is added according to every 35 kilograms of pig iron
The ratio of kilogram inovulant is configured, and wherein nodulizer is the rare earth ferrosilicomagnesium nodulizer of silicone content 1%, and inovulant contains for silicon
The FeSi75 of amount 75%.
A kind of method that ultrasonic wave added V method casts municipal manhole cover, step（3）Described is added ultrasound in nodularization packet
Certain time is handled, specially control electric current 1.5A, output power registration 80%, action time 1 minute.
A kind of method that ultrasonic wave added V method casts municipal manhole cover, step（4）Described continues addition length in type chamber
Graphite probe is ultrasonically treated, specially control electric current 1.5A, output power registration 50%, and action time 18 seconds.
It is an advantage of the invention that：The present invention prepares the sand mold of well lid by V method casting, with conventional wet coating technique phase
Than reducing difficulty of processing, sand core quantity is saved, save the cost mitigates the complexity of technological operation, reduces scab, gas
The casting flaws such as hole, sand holes, the sand that rises；Ultrasonication is added during nodularization in pig iron fusion process in the present invention, occurs
Cavitation effect, it is slower that ultrasonic vibration also declines the temperature of surrounding liquid, and degree of supercooling is not than applying small, institute when ultrasonic wave
It is slow with dendritic growth, form short and thick graphite bar；Also apply ultrasound during solidifying after being cast simultaneously, ultrasonic sound is empty
Changing effect and fuel factor keeps casting cooling slowly, the thus carbon conditional pass diffusion in the carbon poor layer and solution in embassy's body
And reaching balance, the carbon poor layer of spheroidal graphite periphery seldom occurs, and at this moment graphite nodule is just in flame body individually freely for long periods
Growth, so manufactured Graphite in Cast Iron ingredient is uniform in size, and rounding rate is high, and ferrite content is also low, so magnesium iron is comprehensive
It closes mechanical property to be improved, the nodular cast iron well lid prepared by has good mechanical property.Ball produced by the present invention
Black casting iron well lid simple process, is convenient for Industry Control, and excellent in mechanical performance is suitble to a variety of environment, is worthy to be popularized.
Specific embodiment
A kind of method that ultrasonic wave added V method casts municipal manhole cover, including step in detail below：
（1）With the loose sand of compressed air cleaning die surface before overlay film, keep the clean foreign of eva film without breakage, by roasting film
Device, which is moved to, takes film station to grab film, starts and bakes diaphragm, resistive heater, and 80 DEG C of temperature control, when film is slow during sagging
When becoming translucent slowly, carry out overlay film, in coating process, dead head root be difficult to overlay film position can with human assistance overlay film,
After film is adsorbed on mold completely, film mulching device vacuum is closed；
（2）Spraying the previous day impregnates powder coating, and the alcohol that the concentration of 2 times of amounts is 75% is added before moulding, and prepared coating is put
It sets and starts to stir in agitator, between control nozzle diameter 3.5mm, watering can supply gas pressure 0.4MPaMPa, coating is sprayed to
Precoated sand surface, controls thickness between 1mm, other a little higher than positions of thickness near riser utilize hot wind after spraying
It is 90 seconds dry, case sand loading is then detained, using mechanical jolt ramming, checks whether sandbox surrounding film has been fixed with sandbox side wall, it will
Rear mould assembling is fixed in upper mo(u)ld bottom half；
（3）It is configured according to the ratio that 0.35 kilogram of nodulizer and 0.21 kilogram of inovulant is added in every 35 kilograms of pig iron,
Middle nodulizer is the rare earth ferrosilicomagnesium nodulizer of silicone content 1%, and inovulant is the FeSi75 of silicone content 75%, by a miniature resistance
Furnace be put into nodularization packet chamber rise in nodularization packet is preheated, 800 DEG C of temperature control or so, while smelting molten iron, when temperature is up to 1450 DEG C
Come out of the stove, configured nodulizer and inovulant be once added, rear-inclined electric furnace molten iron is poured into nodularization packet, simultaneously
It is popped one's head in using long graphite, the addition ultrasound in nodularization packet, control electric current 1.5A, output power registration 80%, action time 1 minute；
（4）By step（3）It is poured after reaction, checks sand mold control in the condition of negative pressure of 0.05MPaMPa before pouring
Under, continue to add long graphite probe after casting complete in type chamber and be ultrasonically treated, controls electric current 1.5A, output power registration
50%, action time 18 seconds, cooling, casting mold after cooling on cooling roller bed were transported to through supercooling transfer car(buggy) and is transported to solution case
Position carries out solution case, and casting well lid is obtained after knockout.
Claims (7)
1. a kind of method that ultrasonic wave added V method casts municipal manhole cover, which is characterized in that including step in detail below：
（1）With the loose sand of compressed air cleaning die surface before overlay film, keep the clean foreign of eva film without breakage, by roasting film
Device, which is moved to, takes film station to grab film, starts roasting diaphragm, resistive heater controls certain temperature, when film is in sagging mistake
When slowly becoming translucent in journey, overlay film is carried out, in coating process, the position that dead head root is difficult to overlay film can be with human assistance
Overlay film closes film mulching device vacuum after film is adsorbed on mold completely；
（2）Dry powder mould wash is configured, prepared coating, which is placed into, to be started to stir in agitator, controls nozzle diameter and spray
Coating is sprayed to precoated sand surface by pot supply gas pressure, controls thickness between 1-1.5mm, the thickness near riser is a little higher than
Other positions utilize heated-air drying 90-100 seconds after spraying, then detain case sand loading, using mechanical jolt ramming, check sandbox four
Whether all films have been fixed with sandbox side wall, and rear mould assembling is fixed in upper mo(u)ld bottom half；
（3）The pig iron is configured to certain nodulizer and inovulant according to a certain percentage, a miniature resistance furnace is put into ball
Change packet chamber preheats nodularization packet in rising, and 800 DEG C of temperature control or so, while smelting molten iron, temperature carry out when reaching 1450-1480 DEG C
Come out of the stove, configured nodulizer and inovulant be once added, rear-inclined electric furnace molten iron is poured into nodularization packet, use simultaneously
Long graphite probe, is added ultrasonic treatment certain time in nodularization packet；
（4）By step（3）It is poured after reaction, checks sand mold control in the negative pressure of 0.05MPa-0.06MPa before pouring
Under the conditions of, continue to add long graphite probe after casting complete in type chamber and be ultrasonically treated, is transported to through supercooling transfer car(buggy)
Cooling on cooling roller bed, casting mold after cooling is transported to solution case position and carries out solution case, and casting well lid is obtained after knockout.
2. the method that a kind of ultrasonic wave added V method according to claim 1 casts municipal manhole cover, which is characterized in that step
Suddenly（1）The certain temperature of the control, refers to 80-120 DEG C of temperature control.
3. the method that a kind of ultrasonic wave added V method according to claim 1 casts municipal manhole cover, which is characterized in that step
Suddenly（2）The configuration dry powder mould wash, specially spraying the previous day impregnate, and the wine that the concentration of 2 times of amounts is 75% is added before moulding
Essence is prepared.
4. the method that a kind of ultrasonic wave added V method according to claim 1 casts municipal manhole cover, which is characterized in that step
Suddenly（2）The control nozzle diameter and watering can supply gas pressure, specially control nozzle diameter 3.5-4mm, watering can is for air pressure
Between power 0.4MPa-0.6MPa.
5. the method that a kind of ultrasonic wave added V method according to claim 1 casts municipal manhole cover, which is characterized in that step
Suddenly（3）Described according to a certain percentage configures the pig iron certain nodulizer and inovulant, specially according to every 35 kilograms
0.35 kilogram of nodulizer is added in the pig iron and the ratio of 0.21 kilogram of inovulant is configured, and wherein nodulizer is silicone content 1%
Rare earth ferrosilicomagnesium nodulizer, inovulant are the FeSi75 of silicone content 75%.
6. the method that a kind of ultrasonic wave added V method according to claim 1 casts municipal manhole cover, which is characterized in that step
Suddenly（3）Described is added ultrasonic treatment certain time in nodularization packet, specially control electric current 1.5A, output power registration 80%,
Action time 1 minute.
7. the method that a kind of ultrasonic wave added V method according to claim 1 casts municipal manhole cover, which is characterized in that step
Suddenly（4）The long graphite probe that continues to add in type chamber is ultrasonically treated, specially control electric current 1.5A, output power
Registration 50%, action time 18 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810977721.6A CN108838325A (en) | 2018-08-27 | 2018-08-27 | A kind of method that ultrasonic wave added V method casts municipal manhole cover |
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| CN201810977721.6A CN108838325A (en) | 2018-08-27 | 2018-08-27 | A kind of method that ultrasonic wave added V method casts municipal manhole cover |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109666773A (en) * | 2019-01-29 | 2019-04-23 | 大连交通大学 | The method for generating spherical graphite without using nodulizer |
| CN110756732A (en) * | 2019-12-03 | 2020-02-07 | 安徽省含山县皖中减速机械有限公司 | Casting process for improving casting defects of speed reducer pin gear shell |
| CN115820970A (en) * | 2022-11-14 | 2023-03-21 | 江苏吉鑫风能科技股份有限公司 | Production process of nodular cast iron for wind power casting |
| CN116689710A (en) * | 2023-08-02 | 2023-09-05 | 山西华德冶铸有限公司 | Casting method of excavator rotating support |
-
2018
- 2018-08-27 CN CN201810977721.6A patent/CN108838325A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109666773A (en) * | 2019-01-29 | 2019-04-23 | 大连交通大学 | The method for generating spherical graphite without using nodulizer |
| CN110756732A (en) * | 2019-12-03 | 2020-02-07 | 安徽省含山县皖中减速机械有限公司 | Casting process for improving casting defects of speed reducer pin gear shell |
| CN115820970A (en) * | 2022-11-14 | 2023-03-21 | 江苏吉鑫风能科技股份有限公司 | Production process of nodular cast iron for wind power casting |
| CN115820970B (en) * | 2022-11-14 | 2024-03-12 | 江苏吉鑫风能科技股份有限公司 | Production process of spheroidal graphite cast iron for wind power castings |
| CN116689710A (en) * | 2023-08-02 | 2023-09-05 | 山西华德冶铸有限公司 | Casting method of excavator rotating support |
| CN116689710B (en) * | 2023-08-02 | 2023-10-13 | 山西华德冶铸有限公司 | Casting method of excavator rotating support |
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Application publication date: 20181120 |
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