CN101880850A - Method for thermal spraying of composite bottom layer of aluminum pan of electromagnetic oven - Google Patents
Method for thermal spraying of composite bottom layer of aluminum pan of electromagnetic oven Download PDFInfo
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Abstract
The invention discloses a method for thermal spraying of a composite bottom layer of an aluminum pan of an electromagnetic oven, which is used in the manufacturing industry of food cookers and is as shown by a drawing appended to the abstract. A magnetic composite layer with a certain thickness is formed by using an automatic spraying method, designing the joint of a coating and the pan bottom into a concave mosaic structure and spraying a magnetic material (pure iron, iron alloy or 430 stainless steel) to the bottom of the aluminum pan so as to meet the operating requirements of the electromagnetic oven. According to the requirements of a product, one or more material (copper, stainless steel, aluminum, nickel, chromium or ceramic) coatings with different thicknesses or functions can be sprayed to realize aesthetic property, practicability and functionality of the electromagnetic oven pan to ensure that the pans for the electromagnetic oven become various middle-grade and high-grade series products.
Description
Technical field:
The invention belongs to the food pot manufacturing in the food cooker field.Adopt the method for automatic thermospray, magnetically permeable material is sprayed on the bottom of flat aluminum pot, form certain thickness composite bed, to satisfy the use of electromagnetic oven.Needs according to product, can spray the coating of one or more layers different thickness or difference in functionality material again, as copper, stainless steel, aluminium, nickel, chromium, pottery etc., satisfy aesthetic property, the practicality and functional of electromagnetic oven, make electromagnetic oven pan form diversified series product.
Background technology:
Food is closely related with people's life with pot, with a long history and kind is numerous to be well-known, usually the material by the pot body is divided into: iron pan, aluminum pot, Stainless Steel Kettle, copper pot, magnesium alloy pot, enamel kiln, pottery pot, marmite, composite pot etc., wherein aluminum pot, iron pan and Stainless Steel Kettle are leading product.Along with human living standard's raising, people to benefit health, practical and attractive, multiple functional, safe and reliable food is had higher requirement with pot, impel manufacturer to the renewal of product to satisfy the demand in market.For many years, people are at the characteristics of pot commonly used, by method and the manufacturing technology that adopts various advanced persons, create a series of multi-purpose food with pot, as products such as the non-stick pan of the thick end of thin-walled, multilayer material structure, rustless fume-less cooker, health care pot, energy-conservation pot, electromagnetic oven pan, digital temperature control pots.
Electromagnetic oven has efficiently, energy-saving and environmental protection, realize characteristics such as temperature automatically controlled easily, be one of household appliances at present with fastest developing speed, annual growth is about 30%～50%, so electromagnetic oven is increasing at faster speed year by year with the demand of pot, and also have higher requirement in kind, quality, function aspects, be the focus of existing market demand and the focus of development.In line with the development prospect of electromagnetic oven pan, the present invention adopts comparatively sophisticated hot-spraying techniques, at the bottom of flat aluminum pot spraying one deck magnetically permeable material, realizes the use properties of electromagnetic oven with pot.Its reason is: aluminum pot have light, attractive in appearance, durable, heating is fast, heat conduction evenly, characteristics such as non-corrosive, production cost be low, the aluminum pot cooking helps protecting the vitamins C in the vegetables in addition, present market occupancy volume about 80%.But aluminium is magnetic conduction not, can not directly use on electromagnetic oven, so people adopt the whole bag of tricks to satisfy the service requirements of electromagnetic oven at the compound one deck magnetic conductive material in flat aluminum pot bottom.Look into newly through data and to learn, method commonly used at present has: mechanical pressing, forging and pressing, die casting, sintering, plating, welding (soldering, explosive welding, diffusion welding, pressure welding, spot welding, melting etc.) and spraying etc., these methods respectively have its characteristics, but thermospray is more suitable for the preparation of differing materials thick coating.
Thermospray is the new technology of a surface modification, because development rapidly, obtained using widely in all trades and professions, when especially adopting arc spray process to make the medium and high-grade pot, more can embody following superiority: 1. facility investment is few, operating procedure is simple, realizes automated job easily, the production efficiency height; 2. do not need special operationlocation, and floor space is little; 3. in spraying process, can not make a pot body overheating deforming, more can not destroy tissue, composition, the performance of pot body; 4. the spray material range of choice is big, and every solid or medicine core-wire material that can conduct electricity may be used to the spraying of pot, can not influence coating quality owing to the difference of material; 5. can realize the multilayered structure of monolayer material structure, differing materials, the coating of gradient-structure; 6. be combined as a whole between coating and the pot body, benefit heat conduction and be beneficial to uniformly transfer heat; 7. coating even compact, the good difficult drop-off of bonding strength, coat-thickness is controlled easily, and the post-treatment amount is few, and scrap rate is minimum, and production cost is low etc., so spraying technology has also obtained corresponding exploitation in the food pot manufacturing.Such as: patent 87201364 is to have sprayed layer of metal aluminium on the heating surface of soft steel, Stainless Steel Kettle, makes a kind of aluminium pot possessing composite bottom; Patent 88207926 is the internal surface spraying one deck iron that has the aluminium interlayer Stainless Steel Kettle in aluminium, stainless steel and bottom, makes the compound pot that a kind of internal surface is an iron; Patent CN89102330.5 is at the bottom of the flame plating complex copper is adopted in the bottom of a pan of Stainless Steel Kettle.Technology is to adopt the processing of nickel one bronze medal transition layer, sprays copper alloy powder then.Patent CN90215112.6 is pot compound one deck resistant metal of outside surface or the alloy coat of making at steel sheet; Patent CN90209085.2 is to spray nickel-bottom layer of aluminum earlier on the iron pan surface, sprays nickel aluminum metal coating again, iron/copper-spelter coating; Patent CN90103060.0 is to make bottom with oxygen-acetylene gas spray gun spraying ni al composite wire on cooker, again with the high zinc-iron base of arc pistol spraying high-copper coating; Patent CN91221218.7, a kind of aluminium-plated multi-functional frying pan; Patent CN93211095.9 sprays a layer ferrous metal ceramic coating at aluminium or Stainless Steel Kettle external surface usefulness gas hot-spraying techniques, a kind of energy-conservation pot of cermet coating; Patent CN98111628.0 is the counter-fire face spraying aluminium lamination at cast iron pot body; Patent CN02232592.1, a kind of sticking frying pan of five-layer structure, in pot to outside be followed successively by: spraying antistick layer, the superhard stainless steel titanium alloy of electric arc spraying superabrasive layer, the smart pig iron die casting of frying pan main body layer, efficient heat-sink shell, rustproof layer; Patent CN200620071558.X, at the internal surface of iron pan, spraying one deck powder of stainless steel or covering one deck stainless steel thin layer; Patent CN200710019866.7 sprays Nickel Aluminium Alloy Powder on the pot body, spray the graded ceramics powder again, applies the last layer silicon dioxide layer at last on ceramic layer again; Patent CN200510018400.6, adopt electric-arc thermal spray coating or the thermospray of flame wire rod, fine aluminium silk or aluminium alloy wire are sprayed on the ceramic material layer or glass material layer of cooker outer bottom, form pure aluminum metal material layer or the aluminum base alloy material layer that is combined with it solidly thereon, to form the electromagnetic induction heating layer.(aluminium is magnetic conduction not, can not form the electromagnetic induction heating layer, and this patent may be wrong).
For above-mentioned achievement, no matter some patent was because technology was also not really ripe at that time, or condition is limit and can't realize causing patent discarded, perhaps vicious indivedual patents (patent CN200510018400.6), but the good news is that hot-spraying techniques has involved in edible pot manufacturing, has further proved the feasibility and the superiority of this technology.The present invention makes the electromagnetic oven pot in the bottom of a pan of flat aluminum pot spraying one deck magnetic conduction coating, this coating can be the coating of individual layer magnetically permeable material, also can be the bilayer or the laminated coating of differing materials, can make electromagnetic oven pan realize characteristic diversified series product.Think by analysis, above-mentioned patent and common ground of the present invention are to adopt the surface preparation coating of spraying method at pot, but the method that does not relate to thermal spraying of composite bottom layer of aluminum pan of electromagnetic oven so the present invention has certain innovation and practicality, and can be widened the development approach of other type pot.
Summary of the invention:
1. scheme
Product type: electromagnetic oven aluminum pot with composite bottom.
Product structure: the thick flat aluminium tire pot body of thin-walled, the bottom of a pan spraying magnetically permeable material coating or magnetic conduction coating+functional coat.
Product material: pot body material---aluminium alloy;
Coated material---magnetic conductive material (pure iron, iron alloy, 430 stainless steels);
Functional material (copper, stainless steel, aluminium, nickel, chromium, pottery).
Coating structure: individual layer---magnetically permeable material;
Double-deck---nexine: magnetically permeable material, skin: functional material.
Spraying method: electric arc spraying, plasma spraying adopts automatic spraying operation mode.
Spraying coating process: the bottom of a pan preprocessing-spraying protection-spraying position pre-treatment-spray-on coating-coating dimensional precision post-treatment
2. key problem in technology
The method of a kind of thermal spraying of composite bottom layer of aluminum pan of electromagnetic oven of the present invention adopts electrical arc spraying method for preparing metallic substance coating, adopts plasma spraying to prepare ceramic coating.Key problem in technology is: the 1. design of coating structure comprises the structure of coating itself and the structure of coating and junction, the bottom of a pan; 2. the design of coated material and selection; 3. the design of coating spraying technology.
3. the design of coating structure and embodiment
The content of coating structure design mainly comprises: the total thickness of coating, the number of plies, every layer the isoparametric design of structure of thickness, the coupling between each layer, coating and workpiece junction.The reasonableness of coating structure directly influences the quality of coating, especially comes off most important to Bond Strength of Coating height, coating cracking.
Purposes type, environment for use condition, work-ing life and the performance index of the thickness of coating and the kind of coated material, coating, economy etc. are relevant, will take all factors into consideration during design.
As everyone knows, the electromagnetic oven pan body should have certain magnetic property could satisfy the use of electromagnetic oven, therefore needs magnetically permeable material to guarantee.Aluminum pot is nonmagnetic, usually compound one deck magnetically permeable material just can become the electromagnetic oven pot in the bottom of a pan, but the size of the magnetic intensity of the bottom of a pan magnetic conductive material layer, thickness and area has determined the magnetic conduction ability of aluminum pan of electromagnetic oven, so must consider these factors during the structure of design magnetic conduction coating.Present combined bottom aluminum pan of electromagnetic oven product, combined bottom generally adopts stainless iron or 430 stainless steels, and thickness is 4mm.The present invention is with reference to this useful parameter, and the pot after the spraying is tested, and the design area of determining coating is than the little 20mm of the bottom of a pan diameter, and the thickness of magnetic conduction coating is more satisfactory when 4～5mm, if the too thick meeting of coating makes cost up.
The junction in the coating and the bottom of a pan is designed to pattern structure form in the spill, this structure formation can avoid the coating edge aliquation to come off, the thickness of easy control coating when spraying continuously, the post-treatment of suitable spraying back coating, and the bottom of a pan profile better appearance after the processing.The frame mode of individual layer magnetic conduction coated designs is seen (diameter Ф 150mm is an example with the bottom of a pan) shown in the accompanying drawing 1, with lathe the bottom of a pan is shaped, and the degree of depth is 4.7mm, the coat-thickness 〉=4.8mm of spraying, the coat-thickness 〉=4.5mm after the grinding.The frame mode of two layers of coatings design sees shown in the accompanying drawing 2 that nexine is the magnetic conduction coating, and thickness is 4.5mm, and skin is a functional coating, the total coating thickness 〉=5mm of spraying, the total coating thickness 〉=4.7mm after the grinding.The outer coating of design is bigger than nexine coating diameter, when if about coating diameter is equally big, after having sprayed the nexine coating, the inner lane edge can spray the last layer coating inevitably, and this layer coating intractable is fallen, if continue the spraying outer coating, after ground finish, can manifest a circle nexine coating, the aesthetic property of influence pot, so the outer coating of design can address this problem by the way that adds protection effectively than the big 10mm of nexine coating diameter.
4. the design of coated material and embodiment
The design of coated material is actually the choose reasonable and the application of coated material, with relevant by the working conditions of spraying workpiece, Working environment, technical requirement, work-ing life, economy etc., the desired performance of workpiece under the different operating envrionment conditions is different, as different performances such as corrosion-resistant, wear-resistant, high temperature resistant, anti-oxidant, antifriction, anti-skidding, vibration damping, shock resistance, thermal boundary, insulation, conduction, magnetic diffusivity.
The electromagnetic oven pan of this product is the bottom of a pan spray-on coating at aluminium matter pan, realizes magnetic conduction, decoration, function such as durable.Consider cost and coating quality problem, magnetically permeable material selects pure iron, iron alloy just can satisfy the service requirements of aluminum pan of electromagnetic oven, these materials not only price are low, ample supply and prompt delivery, and anchoring strength of coating is also than higher, and 430 stainless steels also are electromagnetic oven pan magnetically permeable materials commonly used, but price is higher, another purpose of selecting it is to be difficult for getting rusty, erosion resistant, and the grinding rear surface is more attractive in appearance.
The design of functional materials is to select according to the demand in people's preference and market, and the present invention selects copper-nickel alloy, brass, fine copper, austenitic stainless steel, aluminium alloy, nickel, chromium, stupalith.These material grinding rear surfaces are brighter attractive in appearance, and the color and luster of having nothing in common with each other, and copper, aluminium also have the fast function of conducting heat, and stainless steel, stupalith have insulation, characteristics such as wear-resistant, and the use properties of pot is all benefited.
5. the selection of spraying method
Heat spraying method is a lot, its speciality is respectively arranged, coated material of the present invention has been selected two types of metallic substance and stupaliths, consider coating quality and spraying cost problem, select arc spray process metallize material (silk material), be characterized in: facility investment is little, technology maturation, coating quality is stable, the spray efficiency height, and the spraying cost is low.Select the ceramic coated material of plasma spraying method (powder), be characterized in: because the stupalith fusing point is higher, compare with the method that other several energy are ceramic coated, technology maturation, coating quality is good, the spray efficiency height.
6. the design of spraying coating process and embodiment
Spraying coating process is to guarantee one of most important link of coating quality, and it directly influences each performance index of coating, product structure shape difference and spraying coating process is different, and at the spraying of aluminum pan of electromagnetic oven combined bottom, the spraying coating process design is as follows:
The bottom of a pan preprocessing-spraying protection-spraying position pre-treatment-spray-on coating-coating dimensional precision post-treatment
6.1 the bottom of a pan preprocessing
According to accompanying drawing 1, accompanying drawing 2 finish sizes require processing, mustn't there be oil or other dirt in the spraying position, the surface is coarse fine thread form, this form can be inlayed the metallize particle effectively, benefit the stress of dispersion coatings, be beneficial to the raising Bond Strength of Coating, can avoid coating cracking and aliquation effectively.Require round edge to process bevel at 45, this structure is convenient to the spraying operation, can avoid effectively spraying the line crested and the defective that causes the edge coating misrun.
6.2 spraying protection
For preventing other position of damage pot in sandblasting and the spraying process, before spraying, to carry out necessary protection to pot.With the thick steel plate of 2mm, be pressed into protection mold as shown in Figure 3, the manhole of sandblast and spraying usefulness is left in the bottom, and the processing of through hole edge is at 45, and pot is fixed in the protection mold, can carry out sandblast or spraying work.The through-hole diameter Ф of sandblast protection mold is the same with the bottom of a pan coating diameter size of design, and that damages the bottom of a pan in the time of can avoiding sandblast does not spray the position.The through-hole diameter Ф of nexine coating spraying protection mold is the same with the bottom of a pan nexine coating diameter size of design, is sprayed on the spraying position of outer coating in the time of can avoiding spraying.The through-hole diameter Ф of outer coating spraying protection mold can avoid defectives such as coating edge misrun than the big 5mm of the bottom of a pan outer coating diameter of design, after the plane grinding of the bottom of a pan, excess coating can be machined away.
6.3 spraying position surface preparation
Must purify and roughening treatment the spraying position before the spraying, owing to require no dirt after the preprocessing of the bottom of a pan, the method for this process using sandblasting once realizes purifying and alligatoring work.The purpose of sandblasting is " anchor colludes effect " that increases coating and matrix, and concentrating of dispersion coatings stress reduces the string stress of coating, increase the bonded area of coating and matrix, further purify the surface, and play the effect of surface active, thereby improve coating and high base strength.So sandblast face must clean, and certain roughness is arranged, the effect after the sandblast of this processing requirement reaches metalluster, and the convex-concave hole is evenly distributed and assumes diamond in shape shape.Sandblast position hand not allowable is touched, and mustn't make dirty, and the pot that has sprayed sand should spray as early as possible, at interval must not be above 1 hour.
Pot is fixed in the sandblast protection mold (accompanying drawing 3) carries out sandblast work, 25 purpose corundum sands are selected in the bottom of a pan sandblast for use, and compressed air pressure is 0.8MPa.
6.4 the setting of spraying and parameter
The spraying of the bottom of a pan coating adopts Special Automatic spraying equipment to spray, and sees accompanying drawing 4, and embodiment is as follows:
(1) pot 1 is fixed in the protection mold 2, is contained on the sucker turntable 3, pot is sucked by vacuum pump 4.
(2) start wheelwork 5, drive sucker turntable 3 and rotate,, set speed of rotation according to the spraying diameter in the bottom of a pan.
(3) spray distance in the adjusting spray gun 6 and the bottom of a pan, electric arc spraying is 150mm, plasma spray is painted with 100mm.Spray angle is 90 °.
(4) the specification type according to spray material is provided with spray parameters, electric arc spraying: spray voltage, spraying current, atomization pressure and flow; Plasma spraying: spraying current, main gas (Ar) pressure and flow, auxilliary gas (H
2) pressure and flow, powder feeding gaseous tension and flow, powder feed rate.
(5) start spraying machine 7 and spray gun travel mechanism 8, drive spray gun 6 transverse movements, the spraying movement locus is to begin to walk to center, the bottom of a pan from the bottom of a pan outward flange, speed is to speed from slow linearity, spray gun automatically returns to the edge again behind the center, speed is to slow down from fast linearity, and spray gun is by the spraying of walking repeatedly of this track, when reaching the thickness of design, coating can stop spraying (according to the thickness of each spraying, the number of times that calculates walking is controlled) automatically.The cooling system that pair pot is arranged in the sucker turntable 3 can guarantee that spraying is indeformable continuously in the bottom of a pan, thereby enhance productivity.
7. the following process of the bottom of a pan coating
Though the bottom of a pan after spraying surface is smooth, and is equally coarse to fine sandpaper, need processing, the present invention is ground to the size of design with the method for grinding with coatingsurface earlier, then with the method for polishing again with surface finish, make surface, the bottom of a pan be bright state.
8. coating quality index
According to the service requirements of relevant criterion and electromagnetic oven pan, coating should reach following index:
(1) coating voidage≤5%;
(2) anchoring strength of coating＞20MPa;
(3) the coating flawless, come off, defective such as damage;
(4) coating and pot are 100% mortise face between the body;
(5) pot body when the thermal shock of bearing 300 ℃ coating not aliquation come off.
9. owing to adopted technique scheme, the present invention to obtain following effect:
(1) adopts spraying technology to make composite bottom layer of aluminum pan of electromagnetic oven, make coating and pot body realize firm and seamless integrative-structure form, have good product quality, the production efficiency height, low cost of manufacture, the characteristics that the range of choice of coated material is wide realize the medium and high-grade pot of multiple style easily.
(2) She Ji interior inserted coating structure form, can avoid the coating edge aliquation to come off, the coating thickness of easy control coating, the processing of suitable spraying back coating, the coating after the processing and the bottom of a pan are planes, be not easy to bump coating during use, the coating appearance of circular band color and luster is very attractive in appearance, sees accompanying drawing 5.The outer coating organization plan bigger of design than nexine coating diameter, the defective that can avoid the nexine coating to expose.The frame mode of two layers of coatings of design, the internal layer coating guarantees the magnetic diffusivity of pot, that outer coating has is multi-functional (decorate, anticorrosive, wear-resistant, conduct heat even etc.) practicality.
(3) the magnetic conduction coating is selected pure iron, ferroalloy materials for use, not only can satisfy the magnetic diffusivity of aluminum pan of electromagnetic oven, and the material price is low, ample supply and prompt delivery, and anchoring strength of coating is also than higher.Functional coating is selected copper-nickel alloy, brass, fine copper, austenitic stainless steel, aluminium alloy, nickel, chromium, stupalith for use.Surface-brightening after these materials processings is attractive in appearance, and the color and luster of having nothing in common with each other, and copper, aluminium also have the fast function of conducting heat, characteristics such as that stainless steel, stupalith have is corrosion-resistant, resistance to wear, insulation.
(4) damage of pot has been avoided in the integral protection of pot design effectively, is beneficial to the automatic spraying operation.
Description of drawings:
Accompanying drawing 1 is an individual layer magnetic conduction coating cooking pot bottom structure synoptic diagram of the present invention;
Accompanying drawing 2 is two layers of coatings of the present invention the bottom of a pan structural representations;
Accompanying drawing 3 is protection positioner structure synoptic diagram that the spraying of the present invention the bottom of a pan is used;
Accompanying drawing 4 is automatic spraying equipment synoptic diagram that use in the spraying of the present invention the bottom of a pan;
Accompanying drawing 5 is aluminum pan of electromagnetic oven half product photos at the bottom of the coating compound pot of the present invention.
Accompanying drawing 4 description of symbols:
1 pot, 2 protection molds, 3 sucker turntables, 4 vacuum pumps, 5 wheelworks, 6 spray guns, 7 spraying machines, 8 spray gun travel mechanisms.
Concrete enforcement side example:
Embodiment one: the spraying of aluminum pan of electromagnetic oven individual layer combined bottom (430 stainless steel) coating
1. condition: the profile of pot is seen accompanying drawing 5, the bottom of a pan diameter 150mm, and pot mouthful diameter 210mm, the high 50mm of pot, material is an aluminium alloy, a pot body is the thick bottom structure of thin-walled.Spraying the bottom of a pan composite bed is used for electromagnetic oven and uses, and belongs to low middle-grade pot.
2. the design of coating: according to the working conditions of spraying object, coating adopts single layer structure, and coated material is selected 430 Stainless Steel Wires of Ф 1.6mm for use, has good, corrosion-resistant, the wear-resistant characteristics of magnetic conduction.Coat-thickness after the processing is 4.5mm, considers process redundancy, the coat-thickness 〉=4.8mm after the spraying.The frame mode of coating and the bottom of a pan bonding surface is designed to inlay the circular configuration form in the spill, uses machined into, diameter Ф 130mm, and dark 4.7mm, the inner ring edge is 45 ° of oblique angles, the dark fine thread shape of 0.5mm is processed in the bottom surface.
3. spraying coating process: pot 1 is fixed in the sandblast protection mold 2 that through-hole diameter is Ф 130mm (accompanying drawings 4), to the bottom of a pan spraying position sandblasting.Then pot is taken out from mold, being fixed on through-hole diameter again is in the spraying protection mold of Ф 135mm, is contained in by (accompanying drawing 4) on the automatic spraying equipment, gets final product after the method for employing electric arc spraying sprays to size continuously.
4. coating processing: adopt the method for grinding, the coating and the bottom of a pan polished together, but coat-thickness must not＜4.6mm, adopt polissoir then, minute surface is thrown in the bottom of a pan till.
Embodiment two: the spraying of (iron+brass) coating at the bottom of the aluminum pan of electromagnetic oven two-layer compound
1. condition: the profile of pot is seen accompanying drawing 5, the bottom of a pan diameter 150mm, and pot mouthful diameter 210mm, the high 50mm of pot, material is an aluminium alloy, a pot body is the thick bottom structure of thin-walled.Spraying the bottom of a pan composite bed is used for electromagnetic oven and uses, and belongs to the medium and high-grade pot.
2. the design of coating: according to the working conditions of spraying object, coating adopts bilayer structure, and nexine is the magnetic conduction coating, and skin is a functional coating, and magnetically permeable material is selected the iron wire of Ф 1.6mm for use, has that magnetic conduction is good, bonding strength is high, low-cost characteristics; Functional materials is selected the brass wire of Ф 1.6mm for use, have heat transfer well, bonding strength height, characteristics that color and luster is attractive in appearance.The thickness of magnetic conduction coating is 4.5mm, and the thickness 〉=0.2mm after the Brass coating processing considers process redundancy, total coat-thickness 〉=4.8mm.The frame mode of coating and the bottom of a pan bonding surface is designed to inlay the circular configuration form in the spill, uses machined into, and the inner ring edge is 45 ° of oblique angles, the dark fine thread shape of 0.5mm is processed in the bottom surface, nexine diameter Ф 120mm, dark 4.5mm, outer diameter Ф 130mm, dark 0.4mm.
3. spraying coating process: pot 1 is fixed in the sandblast protection mold 2 that through-hole diameter is Ф 130mm (accompanying drawings 4), to the bottom of a pan spraying position sandblasting.Then pot is taken out from mold, being fixed on through-hole diameter again is in the spraying protection mold of Ф 120mm, is contained in by (accompanying drawing 4) on the automatic spraying equipment, adopts the method for electric arc spraying, carries out the spraying of nexine magnetic conduction coating, and coat-thickness reaches till the 4.5mm.Pot is taken out from mold, and being fixed on through-hole diameter again is in the spraying protection mold of Ф 135mm, adopts the method for electric arc spraying, carries out the spraying of outer Brass coating, till total coating thickness 〉=5.1mm.
4. coating processing: adopt the method for grinding, the coating and the bottom of a pan polished together, but total coating thickness must not＜4.8mm, adopt polissoir then, minute surface is thrown in the bottom of a pan till.
5. Guo characteristics: the bottom of a pan heat-transfer effect is good, low cost of manufacture, the circular bronze mirror of Brass coating picture one side in the bottom of a pan is attractive in appearance as smart as a new pin.
Embodiment three: the spraying of (iron+aluminium) coating at the bottom of the aluminum pan of electromagnetic oven two-layer compound
1. condition: the profile of pot is seen accompanying drawing 5, the bottom of a pan diameter 150mm, and pot mouthful diameter 210mm, the high 50mm of pot, material is an aluminium alloy, a pot body is the thick bottom structure of thin-walled.Spraying the bottom of a pan composite bed is used for electromagnetic oven and uses, and belongs to the medium and high-grade pot.
2. the design of coating: according to the working conditions of spraying object, coating adopts bilayer structure, and nexine is the magnetic conduction coating, and skin is a functional coating, and magnetically permeable material is selected the iron wire of Ф 1.6mm for use, has that magnetic conduction is good, bonding strength is high, low-cost characteristics; Functional materials is selected the aluminum-alloy wire of Ф 1.6mm for use, have heat transfer well, bonding strength height, color and luster and the same, the low-cost characteristics of pot body.The thickness of magnetic conduction coating is 4.5mm, and the thickness 〉=0.2mm after the aluminum coating processing considers process redundancy, total coat-thickness 〉=4.8mm.The frame mode of coating and the bottom of a pan bonding surface is designed to inlay the circular configuration form in the spill, uses machined into, and the inner ring edge is 45 ° of oblique angles, the dark fine thread shape of 0.5mm is processed in the bottom surface, nexine diameter Ф 120mm, dark 4.5mm, outer diameter Ф 130mm, dark 0.4mm.
3. spraying coating process: pot 1 is fixed in the sandblast protection mold 2 that through-hole diameter is Ф 130mm (accompanying drawings 4), to the bottom of a pan spraying position sandblasting.Then pot is taken out from mold, being fixed on through-hole diameter again is in the spraying protection mold of Ф 120mm, is contained in by (accompanying drawing 4) on the automatic spraying equipment, adopts the method for electric arc spraying, carries out the spraying of nexine magnetic conduction coating, and coat-thickness reaches till the 4.5mm.Pot is taken out from mold, and being fixed on through-hole diameter again is in the spraying protection mold of Ф 1135mm, adopts the method for electric arc spraying, carries out the spraying of outer aluminum coating, till total coating thickness 〉=5.1mm.
4. coating processing: adopt the method for grinding, the coating and the bottom of a pan polished together, but total coating thickness must not＜4.8mm, adopt polissoir then, minute surface is thrown in the bottom of a pan till.
5. Guo characteristics: the pot body heat transferring is effective, and manufacturing cost is very low, and the coating in the bottom of a pan and the same color of pot body as full aluminum pot, but can be used for the electromagnetic oven use.
Embodiment four: the spraying of (iron+pottery) coating at the bottom of the aluminum pan of electromagnetic oven two-layer compound
1. condition: the profile of pot is seen accompanying drawing 5, the bottom of a pan diameter 150mm, and pot mouthful diameter 210mm, the high 50mm of pot, material is an aluminium alloy, a pot body is the thick bottom structure of thin-walled.Spraying the bottom of a pan composite bed is used for electromagnetic oven and uses, and belongs to high-grade pot.
2. the design of coating: according to the working conditions of spraying object, coating adopts bilayer structure, and nexine is the magnetic conduction coating, and skin is a functional coating, and magnetically permeable material is selected the iron wire of Ф 1.6mm for use, has that magnetic conduction is good, bonding strength is high, low-cost characteristics; Functional materials is selected Al for use
2O
3+ TiO
240% ceramic powder material has the characteristics of good heat insulation, wear-resistant, resistance to high temperature oxidation, corrosion-resistant, bright in color.The thickness of magnetic conduction coating is 4.5mm, and the thickness 〉=0.2mm after the ceramic coating processing considers process redundancy, total coat-thickness 〉=4.8mm.The frame mode of coating and the bottom of a pan bonding surface is designed to inlay the circular configuration form in the spill, uses machined into, and the inner ring edge is 45 ° of oblique angles, the dark fine thread shape of 0.5mm is processed in the bottom surface, nexine diameter Ф 120mm, dark 4.5mm, outer diameter Ф 130mm, dark 0.4mm.
3. spraying coating process: pot 1 is fixed in the sandblast protection mold 2 that through-hole diameter is Ф 130mm (accompanying drawings 4), to the bottom of a pan spraying position sandblasting.Then pot is taken out from mold, being fixed on through-hole diameter again is in the spraying protection mold of Ф 120mm, is contained in by (accompanying drawing 4) on the automatic spraying equipment, adopts the method for electric arc spraying, carries out the spraying of nexine magnetic conduction coating, and coat-thickness reaches till the 4.5mm.Pot is taken out from mold, and being fixed on through-hole diameter again is in the spraying protection mold of Ф 135mm, is contained on the automatic spraying equipment, adopts the method for plasma spraying, carries out the spraying of outer ceramic coating, till total coating thickness 〉=5mm.
4. coating processing: adopt the method for grinding wheel grinding, the coating and the bottom of a pan polished together, but total coating thickness must not＜4.7mm, adopt the method for polishing then, minute surface is thrown in the bottom of a pan till.
5. Guo characteristics: good heat insulation, wear-resistant, resistance to high temperature oxidation, clean corrosion-resistant, well, coating is black, burnishing, very attractive in appearance.
Claims (5)
1. one kind is used for the method that food is used the thermal spraying of composite bottom layer of aluminum pan of electromagnetic oven of pot manufacturing, adopt the method (seeing Figure of description 4) of spraying automatically, the junction in the coating and the bottom of a pan is designed to the interior pattern structure form of spill and (sees Figure of description 1, accompanying drawing 2), magnetically permeable material is sprayed on the bottom of flat aluminum pot, form certain thickness magnetic diffusivity composite bed, to satisfy the service requirements of electromagnetic oven, needs according to product, can also spray the coating of one or more layers difference in functionality material again, realize the aesthetic property of electromagnetic oven, practicality and functional makes electromagnetic oven form diversified medium-to-high grade series product with pot.
2. employing hot-spraying techniques according to claim 1 is made composite bottom layer of aluminum pan of electromagnetic oven, it is characterized in that: 1. to have a coating performance good, aesthetic in appearance in the composite bed the bottom of a pan of Zhi Zaoing, the production efficiency height, low cost of manufacture realizes characteristics such as automatic production easily; 2. the range of choice of coated material is wide, makes diversified medium-to-high grade series product easily.
3. the junction in the employing coating according to claim 1 and the bottom of a pan is designed to pattern structure form in the spill, it is characterized in that: 1. can improve Bond Strength of Coating, the effect that supercoat is arranged and avoid the coating edge aliquation to come off is not easy to bump coating during use; 2. the thickness of easy control coating when continuous spraying; The ground finish of 3. suitable spraying back coating, the circular coating after the processing and the bottom of a pan are horizontal planes, guarantee the aesthetic property of coating appearance; 4. can make and reach 100% firm and seamless bonding surface between the coating and the bottom of a pan.
4. employing according to claim 1 is sprayed on magnetically permeable material the bottom of flat aluminum pot, form certain thickness magnetic diffusivity composite bed, to satisfy the service requirements of electromagnetic oven, it is characterized in that: the frame mode of the single-layer coating of design, coated material is selected 430 Stainless Steel Wire materials for use, adopt arc spray process spray formation continuously, coating diameter is than the little 20mm in the bottom of a pan, coat-thickness 〉=4.5mm after the grinding, the bottom of a pan has the magnetic diffusivity of electromagnetic oven with pot, wear-resistant, resistance to high temperature oxidation, corrosion-resistant, specious effect, it is good to have a coating quality, the characteristics of low cost of manufacture.
5. the coating that can also spray one or more layers difference in functionality material more according to claim 1, realize aesthetic property, the practicality and functional of electromagnetic oven, it is characterized in that: the frame mode of the duplex coating of design, 1. the internal layer coated material is selected iron or iron alloy silk material for use, have good magnetic diffusivity, cheap, the ample supply and prompt delivery of material, characteristics such as anchoring strength of coating height adopt the continuous spray formation of arc spray process, coating diameter is than the little 30mm in the bottom of a pan, and coat-thickness is 4.5mm; 2. outer coating be used for decorating, anticorrosive, wear-resistant, functional coat such as even conducts heat, coated material can be selected copper-nickel alloy, brass, fine copper, austenitic stainless steel, aluminium alloy, nickel, chromium, stupalith etc. for use, surface-brightening after these materials processings is attractive in appearance, and the color and luster of having nothing in common with each other, copper, aluminium also have the fast function of conducting heat, characteristics such as that stainless steel, stupalith have is corrosion-resistant, resistance to high temperature oxidation, wear-resistant, insulation; 3. electro-conductive material is selected a material for use, uses electric arc spraying, has the characteristics of production efficiency height, low cost of manufacture, and ceramic choice of powder is used plasma spraying, has the advantages that coating quality is good, production efficiency is high; 4. the about layer total coating thickness 〉=4.7mm after the grinding, the outer coating of design be than the structure of the big 10mm of nexine coating diameter, the defective that can avoid the nexine coating to expose; 5. at the bottom of the compound pot of this coating structure, not only have the magnetic diffusivity of electromagnetic oven with pot, and through after grinding, the polishing, the bottom of a pan outer rim and coating are a plane, circular coating is as mirror, and is attractive in appearance as smart as a new pin.
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| CN2009101371440A CN101880850A (en) | 2009-05-06 | 2009-05-06 | Method for thermal spraying of composite bottom layer of aluminum pan of electromagnetic oven |
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