CN102441643A - Lost-foam casting production process combined with thermal spraying surface treatment - Google Patents

Lost-foam casting production process combined with thermal spraying surface treatment Download PDF

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Publication number
CN102441643A
CN102441643A CN2011104036850A CN201110403685A CN102441643A CN 102441643 A CN102441643 A CN 102441643A CN 2011104036850 A CN2011104036850 A CN 2011104036850A CN 201110403685 A CN201110403685 A CN 201110403685A CN 102441643 A CN102441643 A CN 102441643A
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China
Prior art keywords
thermal spraying
casting
foam casting
temperature
lost foam
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CN2011104036850A
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CN102441643B (en
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张家俊
李伟东
周发明
陈志浩
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HANSHAN QINGXI XINGLONG CASTING FACTORY
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HANSHAN QINGXI XINGLONG CASTING FACTORY
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Abstract

The invention discloses a lost-foam casting production process combined with thermal spraying surface treatment, which combines the characteristics of a thermal spraying process and a lost-foam casting process, and closely combines the two processes to the greatest extent. In the invention, by using a large amount of residual casting heat produced in the cooling process after castings are cast and formed and using the characteristics of a lost-foam casting method that falling sand is easy to clean, the surface quality is high and a running and feeding system is small, the aftertreatment of rough castings and the pretreatment of thermal spraying in the process of lost-foam casting are merged, thereby forming a set of new process which is simplified, economical, energy-saving and environmental-friendly.

Description

A kind of combination thermal spraying surface-treated lost foam casting production technology
 
Technical field
The present invention relates to a kind of lost foam casting production technology that is used for extraordinary castings production, specifically is a kind of combination thermal spraying surface-treated lost foam casting production technology.
Background technology
Along with the most advanced branches of science and development of modern industry; Each industrial department requires plant equipment to descend operation steady in a long-term at high parameter (high temperature, high pressure, high-speed and increasingly automated) and abominable working condition (like serious wearing and tearing and corrosion) more and more, and is also more and more high to the serviceability requirement of material and facility and component of machine.The application of high-performance special part and demand market have obtained increasing fast accordingly, seek economic, practical method and obtain the research and development direction that the high-performance special part becomes this field.
Surface engineering technology arises at the historic moment thus: people are in production practices; On the surface of common material; Make a special working surface; It is reached: a series of multiple functions such as anticorrosion, wear-resisting, anti-attrition, high temperature resistance, anti-oxidant, heat insulation, insulation, conduction, anti-microwave radiation, realize economical with materials, the purpose of energy savings.In addition, as important material forming technology, foundry engieering is to obtain one of the most common and economic means of part.Obviously, plasma spray technology combines with the cast form technology, then can not need use relatively more expensive metal (like titanium, nickel, cobalt, tungsten, zirconium etc.) to carry out monoblock cast and can obtain the high-performance special foundry goods, and application prospect is very wide.The present invention is conceived to this; In conjunction with thermal spraying Surface Engineering and lost foam casting process characteristics; Proposed the comprehensive Foundry Production scheme of a cover, made full use of afterheat in casting and saved the preparatory pre-treatment link of thermal spraying, realized to greatest extent surface engineering technology being fused in the casting production process flow process going.
Thermal spraying and disappearance mould technical background see for details as follows:
Plasma spray technology is as an important branch in the Surface Engineering; In industry, have a wide range of applications; Its know-why is for passing through thermals source such as flame, electric arc or plasma; Certain powdery, band shape, thread or bar-shaped metal or nonmetallic coating material are heated to fusion or half melting state, and the molten drop that will speed up formation sprays to matrix at a high speed and forms coating.Hot-spraying coating is because of excellent functions such as the difference of coating material can realize high-temperature corrosion resistance, resistance to wears, heat insulation, anti-electromagnetic waves, and can reduce the accessory size that wearing and tearing, corrosion or processing error cause to repair.Industry is at present gone up hot-spraying technique commonly used and is comprised wire flame spraying, flame spray powder coating, electric arc spraying, air plasma spraying, detonation flame spraying and HVAF technology etc., and all kinds of hot-spraying technique flow processs have comprised processes such as the pre-treatment in advance of workpiece substrate surface, thermal spraying, post processing, fine finishining.Wherein pre-treatment comprises roughening treatment, ungrease treatment and The pre-heat treatment in advance, and is specific as follows.
(1) roughening treatment: the surface of thermal spraying should have suitable surface roughness, so that increase the gross area that is bonded to particle on the parent metal and the temperature that improves contact area.The size of surface roughness can be close to the pit degree of being on surface with the particle of dusty spray, and the such pit quantity of piece surface is many more, and then underlying metal combines just firmly more with coating.And sprayed coating is thick more, and then prefabricated surface just should be more coarse.The processing of surface roughness can be adopted methods (Shot Blasting possibly not reach effect to a certain degree for certain special workpiece special circumstances) such as sandblast, cutting thread or annular knurl.
(2) ungrease treatment: ungrease treatment also is the important step that prepare on the surface; Part for steel is handled is just passable only the inside and outside flushing with degreasing solvent; But cast iron part is owing to can absorb grease; The grease that when sprayed particle clashes into piece surface, from the micropore of part, grows out can hinder combining of coating and matrix, so cast iron part must soak before spraying and cleans in the solvent of people's heat or in special container, boil.In cleaning, preferably sling part come, so that grease that washes down and solvent flow away together.Washing agent can be used the baked aqueous slkali of 10-15Kg/m concentration.Degreasing wants later water to wash down, and oven dry is perhaps blown away moisture with compressed air in baking oven then.The piece surface for preparing does not go to touch with hand again.If can not spray after the surface is ready at once, should consider that the increase anchoring strength of coating with the resting period will descend.Therefore the resting period surpasses 8 hours in the room, and is open-air and be 0.5 hour in wet weather.Preferably be no more than 1 hour for Al-alloy products.
(3) The pre-heat treatment: in order to make the piece surface activation; Remove residual moisture, reduce internal stress and improve coating and high base strength, before thermal spraying, will part be preheating to 100-150 ℃; If spraying is in low temperature environment, to carry out, preheating is even more important.Desirable preheat temperature, steelwork are 150 ℃, and copper and alloy thereof are 50 ℃, and nickel and alloy thereof are 180 ℃, and aluminium and alloy thereof are 100 ℃.
Lost foam casting (claiming cavityless casting again) is to make with foamed plastics (EPS, STMMA or EPMMA) macromolecular material to become and will produce the duplicate full mold mould of design of part, size of casting; After dip-coating fireproof coating (playing reinforcement, bright and clean, ventilative effect) and oven dry; Be embedded in the dried quartz sand through the three-dimensional vibrating moulding; The casting molding flask pours into molten metal liquid under negative pressure state; The gasification of being heated of macromolecular material model is extracted out, and then replaced the novel casting method that the disposal molding New Casting Technique that formed after the cooled and solidified is produced foundry goods by liquid metals.
With the conventional cast compared with techniques, the lost foam casting technology has impayable advantage.It has following characteristics: 1, casting quality is good, and cost is low; 2, material is not limit, and size is all suitable; 3, precision height, any surface finish, minimizing cleaning, saving machine add; 4, internal flaw significantly reduces, foundry goods dense structure; 5, can realize extensive, production in enormous quantities; 6, be applicable to the production in enormous quantities casting of identical foundry goods; 7, be applicable to manually-operated and automatic assembly line production run control; 8, the technical parameter index request is protected in the cyclization of Production Line state symbol; 8, can improve greatly foundry production line working environment and working condition, reduce labour intensity, reduce energy resource consumption.
Summary of the invention
The technical problem that the present invention will solve provides a kind of combination thermal spraying surface-treated lost foam casting production technology, and it merges lost foam casting process with the thermal spraying operation mutually, realizes the purpose of economic, energy-conservation and environmental protection.
Technical scheme of the present invention is:
A kind of combination thermal spraying surface-treated lost foam casting production technology may further comprise the steps:
(1), lost foam casting: foamed plastics is processed and the design of part that will produce casting, the corresponding full mold mould of size;
(2), the full mold mould is embedded in the quartz sand through three-dimensional modeling, cooperate with sandbox then and carry out casting sand type, after sand casting is good with the sandbox mould assembling, casting of molten metal in the sandbox then;
(3), behind the casting complete, foundry goods cools off, and when being cooled between 200-400 ℃, carries out under this range temperature that knockout breaks away from and the cutting dead head, obtains the foundry goods crude green body of any surface finish;
(4), carry out ball blast or blasting treatment under the foundry goods crude green body uniform temperature, this temperature is on the thermal spraying pretreatment temperature 50-200 ℃, and the processing time is 2-20 minute;
(5), the foundry goods after ball blast or the blasting treatment is carried out the thermal spraying surface treatment, behind the last sealing of hole finished product, the temperature of thermal spraying is 50-250 ℃.
Described lost foam casting is that foamed plastics is processed and the design of part that will produce casting, the corresponding full mold of size, after dip-coating fireproof coating and oven dry, gets the full mold mould then.
The temperature of described thermal spraying is: steelwork: 100-200 ℃; Copper and alloy thereof: 50-100 ℃; Nickel and alloy thereof: 150-250 ℃; Aluminium and alloy thereof: 50-200 ℃.
Described foamed plastics is selected EPS, STMMA or EPMMA foam for use.
Advantage of the present invention:
(1), utilizes the characteristics that the lost foam casting knockout is leveled extremely easily, running and feeding system is little; Accomplish that the foundry goods that is in after the castable operation in the cooling procedure carries out under the higher temperature between 200 ℃ to 400 ℃ that knockout breaks away from and cutting dead head etc. leveled operation, obtain the foundry goods crude green body of any surface finish;
(2), the high temperature foundry goods further cools off; To uniform temperature, carry out ball blast or blasting treatment; Replace the roughening treatment in the preparatory pre-treatment of thermal spraying with this operation, treatment temperature utilizes temperature measuring equipment accurately to select, and is controlled on the thermal spraying treatment temperature between 50-200 ℃; Ball blast or blasting treatment time just are controlled to be between 2-20 minute according to workpiece material and treatment temperature, and surface temperature should be still greater than thermal spraying The pre-heat treatment temperature after ball blast or blasting treatment for workpiece;
(3), utilize lost foam casting process medium casting surface grease to adsorb seldom characteristics, the ungrease treatment link in the preparatory pre-treatment of cancellation thermal spraying;
(4), utilize afterheat of casting, the The pre-heat treatment link in the preparatory pre-treatment of cancellation thermal spraying when cast(ing) surface is cooled to temperature near the thermal spraying treatment temperature, directly begins to carry out the thermal spraying surface treatment.
The present invention combines thermal spraying and lost foam casting process characteristics, utilizes afterheat in casting, to greatest extent the lost foam casting operation is merged with the thermal spraying operation mutually, realizes the purpose of economic, energy-conservation and environmental protection.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
A kind of combination thermal spraying surface-treated lost foam casting production technology may further comprise the steps:
(1), lost foam casting: foamed plastics (EPS, STMMA or EPMMA foam) is processed and the design of part that will produce casting, the corresponding full mold of size, after dip-coating fireproof coating and oven dry, got the full mold mould then;
(2), the full mold mould is embedded in the quartz sand through three-dimensional modeling, cooperate with sandbox then and carry out casting sand type, after sand casting is good with the sandbox mould assembling, casting of molten metal in the sandbox then;
(3), behind the casting complete, foundry goods cools off, and when being cooled between 200-400 ℃, carries out under this range temperature that knockout breaks away from and the cutting dead head, obtains the foundry goods crude green body of any surface finish;
(4), carry out ball blast or blasting treatment under the foundry goods crude green body uniform temperature, this temperature is on the thermal spraying pretreatment temperature 50-200 ℃, and the processing time is 2-20 minute;
(5), the foundry goods after ball blast or the blasting treatment is carried out the thermal spraying surface treatment, behind the last sealing of hole finished product, the temperature of thermal spraying is: steelwork: 100-200 ℃; Copper and alloy thereof: 50-100 ℃; Nickel and alloy thereof: 150-250 ℃; Aluminium and alloy thereof: 50-200 ℃.

Claims (4)

1. one kind combines thermal spraying surface-treated lost foam casting production technology, it is characterized in that: may further comprise the steps:
(1), lost foam casting: foamed plastics is processed and the design of part that will produce casting, the corresponding full mold mould of size;
(2), the full mold mould is embedded in the quartz sand through three-dimensional modeling, cooperate with sandbox then and carry out casting sand type, after sand casting is good with the sandbox mould assembling, casting of molten metal in the sandbox then;
(3), behind the casting complete, foundry goods cools off, and when being cooled between 200-400 ℃, carries out under this range temperature that knockout breaks away from and the cutting dead head, obtains the foundry goods crude green body of any surface finish;
(4), carry out ball blast or blasting treatment under the foundry goods crude green body uniform temperature, this temperature is on the thermal spraying pretreatment temperature 50-200 ℃, and the processing time is 2-20 minute;
(5), the foundry goods after ball blast or the blasting treatment is carried out the thermal spraying surface treatment, behind the last sealing of hole finished product, the temperature of thermal spraying is 50-250 ℃.
2. a kind of combination thermal spraying surface-treated lost foam casting production technology according to claim 1; It is characterized in that: described lost foam casting is that foamed plastics is processed and the design of part that will produce casting, the corresponding full mold of size, after dip-coating fireproof coating and oven dry, gets the full mold mould then.
3. a kind of combination thermal spraying surface-treated lost foam casting production technology according to claim 1, it is characterized in that: the temperature of described thermal spraying is: steelwork: 100-200 ℃; Copper and alloy thereof: 50-100 ℃; Nickel and alloy thereof: 150-250 ℃; Aluminium and alloy thereof: 50-200 ℃.
4. a kind of combination thermal spraying surface-treated lost foam casting production technology according to claim 1, it is characterized in that: described foamed plastics is selected EPS, STMMA or EPMMA foam for use.
CN2011104036850A 2011-12-08 2011-12-08 Lost-foam casting production process combined with thermal spraying surface treatment Expired - Fee Related CN102441643B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102974762A (en) * 2012-12-24 2013-03-20 昌图县吉派机械铸造有限责任公司 Vacuum evanescent die casting process
CN105312501A (en) * 2015-11-02 2016-02-10 广西博白县三田机械制造有限公司 Die casting method
CN105478670A (en) * 2015-12-10 2016-04-13 宋和明 Automatic crank switch manufacturing method
CN112140008A (en) * 2019-06-28 2020-12-29 南京辉腾机械铸造有限公司 Casting included angle grinding process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85107885A (en) * 1985-10-28 1987-05-06 梁·汤姆 The metal flow passage of used in lost wax casting
JP2003305537A (en) * 2002-04-12 2003-10-28 悠己也 ▲高▼木 Spray casting method
CN1535781A (en) * 2003-04-03 2004-10-13 蒋荣昌 Metal thermal melting spray-casting artistic works and its production method
CN101380663A (en) * 2008-08-19 2009-03-11 侯马市模范机械制造有限公司 Precision casting method of lost foam hollow-shell
CN101638788A (en) * 2008-07-28 2010-02-03 沈阳工业大学 Process for preparing antioxidant and wear-resistant layer on surface of copper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85107885A (en) * 1985-10-28 1987-05-06 梁·汤姆 The metal flow passage of used in lost wax casting
JP2003305537A (en) * 2002-04-12 2003-10-28 悠己也 ▲高▼木 Spray casting method
CN1535781A (en) * 2003-04-03 2004-10-13 蒋荣昌 Metal thermal melting spray-casting artistic works and its production method
CN101638788A (en) * 2008-07-28 2010-02-03 沈阳工业大学 Process for preparing antioxidant and wear-resistant layer on surface of copper
CN101380663A (en) * 2008-08-19 2009-03-11 侯马市模范机械制造有限公司 Precision casting method of lost foam hollow-shell

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102974762A (en) * 2012-12-24 2013-03-20 昌图县吉派机械铸造有限责任公司 Vacuum evanescent die casting process
CN105312501A (en) * 2015-11-02 2016-02-10 广西博白县三田机械制造有限公司 Die casting method
CN105478670A (en) * 2015-12-10 2016-04-13 宋和明 Automatic crank switch manufacturing method
CN112140008A (en) * 2019-06-28 2020-12-29 南京辉腾机械铸造有限公司 Casting included angle grinding process

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