CN104999051A - Low-pressure casting method for automobile motor casing and motor casing structure - Google Patents
Low-pressure casting method for automobile motor casing and motor casing structure Download PDFInfo
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- CN104999051A CN104999051A CN201510439370.XA CN201510439370A CN104999051A CN 104999051 A CN104999051 A CN 104999051A CN 201510439370 A CN201510439370 A CN 201510439370A CN 104999051 A CN104999051 A CN 104999051A
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Abstract
The invention discloses a low-pressure casting method for an automobile motor casing. The low-pressure casting method for the automobile motor casing includes the following steps that (1) a sand core structure of a spiral water channel is manufactured; (2) the sand core structure is placed on a lower mold body of a die-casting mold; (3) the automobile motor casing with the sand core structure of the spiral water channel is cast through a low-pressure casting device; (4) heat treatment is conducted on the automobile motor casing, then sand is vibrated out, and the automobile motor casing is provided with the complete spiral water channel; and (5) holes formed in the original sand core structure portion of the sidewall of the automobile motor casing are filled up through welding, so that the complete automobile motor casing with the spiral water channel is formed. The invention further discloses a motor casing structure. Through the low-pressure casting method for the automobile motor casing, the aluminum alloy low-pressure casting process is adopted and the spiral water channel is cast through the sand core of the spiral water channel, so that the cooling effect on a motor is guaranteed, the service life of the motor is greatly prolonged, the requirement for long-time working of an automobile can be met, and the weight of the whole motor is reduced by about 60%.
Description
Technical field
The present invention relates to the technical field of motor casing casting, be specifically related to a kind of automobile electric casing low-pressure casting method, and implement the motor casing structure of this casting method.
Background technology
Foundry Production is the important method of production machinery part or part blank in machine building industry.Casting refers to and manufactures casting mold, smelting metal, and is poured into by molten metal bath and has the casting mold die cavity similar to part shape after its cooled and solidified, obtains the method for the metalwork (foundry goods) of definite shape and performance.Most of spray needs to make machine components through machining again.Under certain process conditions, casting also can be produced and be cut precision component blank or the part without cutting less.Cast form is in fact utilize the mobile performance of motlten metal to realize being shaped.
In automobile manufacturing process, adopt cast iron to make the part of blank a lot, account for full car weight amount about 10%, engine housing, mission case.Manufacture ironcasting and usually adopt sand mold.The raw material of sand mold based on sand, and mixes with binding agent, water etc.Sand mould material must have certain bonding strength, to be moulded required shape and can to resist washing away of high temperature liquid iron and can not avalanche.In order to be moulded the cavity conformed to cast shape in sand mold, first must make model with timber, being called wooden model.After red-hot molten iron cooling, volume can reduce, and therefore, the size of wooden model needs to strengthen by shrinkage factor on the full-sized basis of foundry goods, needs the corresponding thickening in the surface of machining.
Sand casting be with molding sand be main material as casting mold, and rely on liquid metal own wt and mobility, filling cast under gravity, carry out the process of castings production.Sand casting is most widely used a kind of casting method, and its master operation comprises: manufacture apperance, prepare Modeling Material, moulding, make core, mould assembly, melting, cast, knockout, cleaning and inspection etc.Steel, iron and most of non-ferrous alloy casting all can obtain with sand mould casting method.The Modeling Material used due to sand casting is cheap and easy to get, and Casting mold manufacturing is easy, and to the single-piece production of foundry goods, produce by batch and produce in a large number and all can adapt to, for a long time, be the basic technology in Foundry Production always.
Traditional electrical casing adopts the technique of rivet welding, and polylith splicing welding assembly is a casing, and manufacturing process is complicated, and efficiency is low, and can not form standardization, welding position is many, and product appearance defect is many.And the driven by power that current new-energy automobile on the market adopts, the housing of its motor makes according to cast iron, and not only weight is large, and cooling effect is not good, the poor thermal conductivity of iron and steel, and heat radiation is slow, affects electric efficiency, is unfavorable for the long-play of automobile.Therefore, research and development are needed to make a good heat dissipation effect, the light motor shell of durable.
Summary of the invention
This invention is not enough for current art, provides a kind of automobile electric casing low-pressure casting method, manufacturing process is simple, efficiency is high, can produce that quality is high, the motor casing of good cooling results in batch.
The present invention also provides a kind of motor casing structure implementing this casting method.
The technical scheme that the present invention is adopted for achieving the above object is:
A kind of automobile electric casing low-pressure casting method, it comprises the following steps:
(1) prepare the sand core structure of spiral channel, this sand core structure is that the identical semi arch structure core in two, left and right is oppositely spliced, and this sand core structure is provided with two the vertical locating pieces in left and right;
(2) sand core structure is placed into the counterdie of compression mod, two vertical locating pieces of sand core structure and counterdie are located mutually;
(3) by low-pressure casting apparatus, the automobile electric casing with spiral channel sand core structure is cast out;
(4) described for step (3) automobile electric casing is passed through heat treatment, make automobile electric casing reach corresponding hardness, then sand is vibrated out, electric motor of automobile hull shape becomes complete spiral channel;
(5) by welding, the eyelet welding that the position of roughing sand cored structure on the sidewall of the automobile electric casing of step (4) is formed is connect completion, form the complete automobile electric casing with spiral channel.
As further improvement, in described step (1), described sand core structure is that two identical semi arch structure cores are oppositely spliced; The parallel semi arch sand roads being provided with many inclinations in the middle part of semi arch structure core, are provided with lateral connection portion between every bar semi arch sand road and vertical locating piece.
As further improvement, in described step (1), described sand core structure be 84% zircon sand, 15% phenolic resins, 1% dispersant be mixed with and form, at sand core structure surface spraying alcohol-base paint, form core smooth surface protective layer;
Described step (4) specifically also comprises following content: the heat treatment 7 hours automobile electric casing being carried out 530 degrees Celsius, automobile electric casing entirety is immersed in cold water, automobile electric casing is cooled fast, and vibration automobile electric casing, the defeated and dispersed one-tenth graininess of core flows out.
As further improvement, described step (5) also comprises following content: by the heat treatment of automobile electric casing and after sand is shaken out, the lateral connection portion of sand core structure makes the electric motor of automobile shell side wall of low pressure casting form multiple through hole be communicated with spiral channel, by welding, through hole is closed, form the automobile electric casing of the spiral channel of complete connection.
In described step (3), in low-pressure casting apparatus, be provided with the first boiler and the second boiler, the aluminium water of melting in the first boiler is ZL101 alloy, the aluminium water of melting in the second boiler is zl108 alloy or A356-2 alloy, in the second boiler, is provided with agitating device, in aluminium fusion process, stir until it is watered into mold continuously;
Two pot in-furnace temperature are 630 ~ 650 degrees Celsius, ensure that filling type smoothly can reduce again and ooze iron; The metal outer mold of low pressure casting is 80 ~ 100 degrees Celsius, and core is 160 ~ 180 degrees Celsius, and bed die is 200 ~ 300 degrees Celsius, and stalk is incubated 400 ~ 500 degrees Celsius;
In product casting process, carry out filling type continuously through air pressure or electromagnetic pump pressure, until water into mold by aluminium water, the pressure reaching 900 person of outstanding talent's bar makes formed product.
As further improvement, in described step (3), in low-pressure casting apparatus, pass into inert gas, make mineralization pressure between the aluminium water of the melting in the first boiler and compression mod die cavity poor, aluminium water enters in die cavity by stalk, by not solidified center aluminium water impouring boiler after die cavity inwall and sand core structure outer wall form skim solidified shell, in the several seconds (10 ~ 30 seconds), the aluminium water of the melting in the second boiler is injected in mold the remainder being full of mold under stress.
As further improvement, in described step (3), in low-pressure casting apparatus, two boilers are respectively equipped with electromagnetic pump, the aluminium water of the melting in the first boiler is filled in die cavity by electromagnetic pump, by not solidified center aluminium water impouring boiler after die cavity inwall and sand core structure outer wall form skim solidified shell, at several seconds (10 ~ 30 seconds) another electromagnetic pump, the aluminium water of the melting in the second boiler is injected in mold the remainder being full of mold under stress.
A kind of motor casing structure implementing above-mentioned automobile electric casing low-pressure casting method, it comprises the motor casing body of low pressure casting, spiral channel structure is formed in this body, described spiral channel structure is fixed on counterdie by spiral channel sand core structure and casting is motor casing body, motor casing body is heat-treated and cooled fast, spiral channel sand core structure is naturally defeated and dispersed and flow out, and forms the spiral channel structure that motor casing inner body wall is smooth.
Described spiral channel structure is provided with water inlet and delivery port;
Described sand core structure is that the identical semi arch structure core in two, left and right is oppositely spliced, and parallelly in the middle part of described semi arch structure core is provided with many semi arch sand roads tilted.
Described semi arch structure core is provided with two the vertical locating pieces in left and right, is provided with lateral connection portion between every bar semi arch sand road and vertical locating piece.
Beneficial effect of the present invention: the demand developed for existing new forms of energy, by automobile electric casing low-pressure casting method, solve the efficiency of motor casing batch production and raising motor, adopt aluminum alloy low-pressure casting process, and be cast as spiral channel by spiral channel core, ensure the cooling effect of motor, this aluminium alloy casting global formation outward appearance is more attractive in appearance than conventional bonding technique, good cooling results, the electric efficiency of 6 points is promoted than traditional technique, aluminium alloy heat transfer is fast, rapid heat dissipation, add screw type circulating cooling water channel, solve the problem of temperature rise of motor, improve the service time of motor greatly, automobile can be met work for a long time, and the technological forming of aluminum alloy low-pressure casting is than traditional welded steel handicraft product lightweight more, whole motor weight saving about 60%.
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in more detail.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present embodiment motor casing structure;
Fig. 2 is the structural representation of the present embodiment motor casing structure and sand core structure;
Fig. 3 is the structural representation of the present embodiment sand core structure;
Fig. 4 is the semi arch structure sand core structure schematic diagram of the present embodiment sand core structure;
Fig. 5 is the present embodiment semi arch structure core plan structure schematic diagram;
Fig. 6 is the structural representation that the present embodiment sand core structure and counterdie are located.
In figure: 1. motor casing body, 2. spiral channel structure, 3. sand core structure, 31. semi arch structure cores, 32. semi arch sand roads, 33. vertical locating pieces, 34. lateral connection portion, 4. counterdies.
Detailed description of the invention
Embodiment, see Fig. 1 ~ 6, the automobile electric casing low-pressure casting method that the present embodiment provides, it comprises the following steps:
(1) prepare the sand core structure 3 of spiral channel, this sand core structure 3 is that the identical semi arch structure core 31 in two, left and right is oppositely spliced, and this sand core structure 3 is provided with two the vertical locating pieces 33 in left and right; The parallel semi arch sand roads 32 being provided with many inclinations in the middle part of semi arch structure core 31, are provided with lateral connection portion 34 between every bar semi arch sand road 32 and vertical locating piece 33; Semi arch structure core 31 is convenient to the indifference batch micro operations of core, and the core of any two and half arcuate structures all oppositely can be spliced to form a complete sand core structure 3;
(2) sand core structure 3 is placed into the counterdie 4 of compression mod, two vertical locating pieces 33 of sand core structure 3 are located mutually with counterdie 4;
(3) by low-pressure casting apparatus, the automobile electric casing with spiral channel sand core structure 3 is cast out;
(4) described for step (3) automobile electric casing is passed through heat treatment, make automobile electric casing reach corresponding hardness, then sand is vibrated out, electric motor of automobile hull shape becomes complete spiral channel; Concrete operating procedure is automobile electric casing is carried out the heat treatment 7 hours of 530 degrees Celsius, automobile electric casing entirety will be immersed in 5 ~ 15 degrees Celsius of cold water, automobile electric casing is cooled fast, vibration automobile electric casing, the defeated and dispersed one-tenth graininess outflow of core;
(5) by the heat treatment of automobile electric casing and after sand is shaken out, the lateral connection portion 34 of sand core structure 3 makes the electric motor of automobile shell side wall of low pressure casting form multiple through hole be communicated with spiral channel, by welding, through hole is closed, form the automobile electric casing of the spiral channel of complete connection.
In described step (1); described sand core structure 3 be 84% zircon sand, 15% phenolic resins, 1% dispersant mixing compacting form; at sand core structure 3 surface spraying alcohol-base paint; form core smooth surface protective layer; carry out the automobile electric casing water channel inner wall smooth of formation during die casting, not scab.The motor casing of new energy electric motor vehicle belongs to large complicated aluminium alloy castings, and the molding and core making material adopted at present easily produces the casting flaws such as pore, seepage, scab; Casting dimension accuracy is low; Surface quality is poor.Zircon sand/PEPSET resin self-setting sand response lag, good fluidity, complicated casting mold die cavity clear-cut; Once sclerous reaction starts, setting rate is fast, and intensity is high, not easily scab during molding, and surface quality is good; Gas-forming property is little, can reduce blow hole defect; Collapsibility is good, and cast cleaning is easy, can greatly reduce casting cleaning workload, improve the working condition of workman.Adopt zircon sand/PEPSET resin self-setting sand to make water channel gentle road core density large, sharp coefficient of thermal expansion is very little, does not have mold wall moving during cast, and foundry goods cavity dimension easily ensures, precision is high, can prevent seepage; In addition, because the heat storage capacity of zirconium self-curing mo(u)ld is strong, the mechanical performance and the anti-fatigue performance that improve foundry goods is conducive to.Adopt zircon sand/PEPSET resin self-setting sand coring, decrease casting defect, improve dimensional accuracy and the surface quality of foundry goods, improve the combination property of foundry goods.
In described step (3), in low-pressure casting apparatus, be provided with the first boiler and the second boiler, the aluminium water of melting in the first boiler is ZL101 alloy, main chemical compositions (mass fraction) is the Si of 6.5% ~ 7.5%, the Mg of 0.25% ~ 0.45%, and all the other are Al, form zero defect, high-quality foundry goods outer wall after ZL101 alloy low pressure casting, there is good strength character;
The aluminium water of melting in the second boiler is zl108 alloy, main chemical compositions (mass fraction) is the Si of 11% ~ 13%, the Mg of 0.4% ~ 1.0%, the Cu of 1.0% ~ 2.0%, the Mn of 0.3% ~ 0.9%, all the other are Al, impurity F e≤0.7%, in aluminium, add the mobility that silicon improves alloy, thus there is good Feeding Characteristics, low-shrinkage and good heat crack resistance; The aluminium water of melting in the second boiler also can be A356-2 alloy.
Current most of alusil alloy has been used to produce Al-SiC
pparticles reiforced metal-base composition, but in usual fusion process, Al is produced in SiC and Al reaction
4c
3, it is very harmful to the mechanical performance of foundry goods, and the content of Si just can stop Al more than 8%
4c
3formation.Therefore, in the second boiler, be provided with agitating device, in aluminium fusion process, stir until it is watered into mold continuously, Si is dissolved in the alloy to greatest extent, and stops Al
4c
3formation.Meanwhile, the aluminium alloy (i.e. hypereutectic aluminium alloy) of high Si content has low coefficient of thermal expansion, high pyroconductivity and relatively low density, manufactures the automobile electric casing of light weight, alleviates the weight of automobile.
Two pot in-furnace temperature are 630 ~ 650 degrees Celsius, ensure that filling type can reduce again and ooze iron; Metal outer mold is 80 ~ 100 degrees Celsius, and core is 160 ~ 180 degrees Celsius, and bed die is 200 ~ 300 degrees Celsius, and stalk is incubated 400 ~ 500 degrees Celsius, is beneficial to the top-down consecutive solidification of foundry goods;
In low-pressure casting apparatus, pass into inert gas, make mineralization pressure between the aluminium water of the melting in the first boiler and compression mod die cavity poor, aluminium water enters in die cavity by stalk, by not solidified center aluminium water impouring boiler after die cavity inwall and sand core structure 3 outer wall form skim solidified shell, in the several seconds (10 ~ 30 seconds), the aluminium water of the melting in the second boiler is injected in mold the remainder being full of mold under stress.In twice cavity filling process, pressure all reaches 900 person of outstanding talent's bar.
In the process of low pressure casting, first by full for the casting of the first alloy solution mold, treat this alloy after die wall solidifies the solid shell of formation skim by not solidified core solution impouring first boiler, the alloy solution of the second boiler is injected the remainder being full of mold in this mold within the several seconds, the goods so cast, its composition little by little changes from surface to heart portion, there is not discontinuous interface, and the material of graded has different material properties on this composition, the electric motor of automobile hull shape that the present invention is cast becomes zero defect, the foundry goods outer wall that quality is high, and there is good strength character, automobile electric casing central part has low coefficient of thermal expansion, high pyroconductivity and relatively low density, effective reduction total quality, improve heat transfer efficiency.
In the present embodiment, before automobile electric casing carries out die casting, utilize computer numerical simulation, by filling type to low pressure casting part and process of setting carries out computational analysis, dynamically observe the overall process of Filling Processes of Castings and the situation of change of temperature, effectively prevent foundry goods shrinkage cavity, the defect such as loose, improve casting quality and yield rate.
Low pressure casting part fills type and Solidification Process Simulation, foundry goods initial temperature field distribution is accurately obtained by numerical simulation during filling mold, set up the Mathematical Modeling of conducting heat in casting solidification process, and solved by numerical method, improve the precision of filling Casting Solidification Numerical Simulation and failure prediction after type, thus obtain the rule of casting solidification process, possibility, size and location that prediction casting defect (shrinkage cavity, loose) produces.
Utilize FEM-software ANSYS to simulate foundry goods low pressure casting cavity filling process and temperature field, adopt SOLA-VOF method for numerical simulation and finite element algorithm, filling and solidification processess numerical simulation is carried out to low pressure casting part.Concrete steps are as follows: the low pressure casting physical model first being set up automobile electric casing foundry goods by ANSYS, mesh generation is carried out to model, the fluid of ANSYS finite element analysis software simulation aluminium alloy castings in low pressure casting cavity filling process is adopted to flow and heat transfer, whole filling time is about 6S, molten metal is after entering into the die cavity die cavity being fixed with spiral channel core, the inner surface of die cavity and core surface thermal capacitance less, cooling velocity is very fast, molten metal flow velocity changes greatly, liquid metal filling front end flow velocity is steady, laminar flow stable state is kept to be filled with die cavity, liquid metal filling front end flow velocity is steady, laminar flow stable state is kept to be filled with die cavity, decrease relative to gravitational casting and topple over the casting flaws such as the oxide slag inclusion that washing away splashes brings due to molten metal, improve casting quality.
Subsequently, by setting temperature numerical simulation, due to fill type terminate after thermo parameters method be uneven, in computing time, the maximum temperature of foundry goods is 927.94K, minimum temperature is 544K, and owing to adopting low-pressure casting process, type is filled in rising pouring, bottom is comparatively slow near cast gate place cooling velocity, and temperature is higher than other places.When 20s, foundry goods outer wall and the inner wall section near core are solidified completely, form a complete motor casing thin layer solidified shell, subsequently by center aluminium water impouring first boiler not solidified in thin layer solidified shell, and then the aluminium water in the second boiler is filled in motor casing thin layer solidified shell, the rear demoulding is solidified in pressurize, and the low pressure casting completing complete automobile electric casing is shaping.
The present embodiment also provides a kind of motor casing structure implementing automobile electric casing low-pressure casting method, it comprises the motor casing body 1 of low pressure casting, spiral channel structure 2 is formed in this body, described spiral channel structure 2 is fixed on counterdie 4 by spiral channel sand core structure 3 and casting is motor casing body 1, motor casing body 1 is heat-treated and cooled fast, sand core structure 3 is naturally defeated and dispersed and flow out, and forms the spiral channel structure 2 of motor casing body 1 inner wall smooth.
Described spiral channel structure 2 is provided with water inlet and delivery port; Described sand core structure 3 is that the identical semi arch structure core 31 in two, left and right is oppositely spliced, and parallelly in the middle part of described semi arch structure core 31 is provided with many semi arch sand roads 32 tilted.
Described semi arch structure core 31 is provided with two the vertical locating pieces 33 in left and right, lateral connection portion 34 is provided with between every bar semi arch sand road 32 and vertical locating piece 33, when after two identical semi arch structure cores 31 oppositely splicing, the vertical locating piece 33 of two semi arch structure cores 31 is adjacent to mutually, forms the locating piece of sand core structure 3.
Automobile electric casing complex-shaped and technical requirement is high, have air-tightness requirement, foundry goods physical dimension is complicated, and physical dimension requires high.Cast(ing) surface and inherent quality require high; Smooth surface, flat surface roughness are little.Processing datum is without any defect, and cast(ing) surface, inner chamber overlap, burr require high.Foundry goods has not allowed the casting flaws such as scab, crackle, sand holes, pore, shrinkage porosite, so apply sand casting and coordinate certain technological design and control method, is that processing rationalizes validation, obtains high-quality foundry goods.
Embodiment 2, the present embodiment is basic identical with embodiment 1, its difference is, in low-pressure casting apparatus described in step (3), two boilers are respectively equipped with electromagnetic pump, the aluminium water of the melting in the first boiler is filled in die cavity by electromagnetic pump, by not solidified center aluminium water back flow first boiler after die cavity inwall and sand core structure 3 outer wall form skim solidified shell, at several seconds (10 ~ 30 seconds) another electromagnetic pump, the aluminium water of the melting in the second boiler is injected in mold the remainder being full of mold under stress.In twice cavity filling process, pressure all reaches 900 person of outstanding talent's bar.
Electromagnetic pump is the effect utilizing electric current in conductor fluid and magnetic field, and electromagnetic propulsion power (Loulun magnetism) is acted directly on metal liquid, makes it displacement occurs.Electromagnetic pump low-pressure casting low pressure casting system can make Al liquid carry out rising liquid and filling type under the state completely cut off completely with the external world, makes Al liquid and H
2, O
2the condition of contact completely loses, and is conducive to improving aluminium alloy degree of purity, obtains high-quality low die casting; Compared with existing vapour-pressure type low-pressure die casting plant, this system rises liquid without air pressure, fills type; During cast, effectively control to rise liquid and filling velocity by regulating the size of electric current, aluminium alloy is made to fill type steady, reduce or avoid vapour-pressure type low pressure casting due to air pressure fluctuation aluminium alloy being seethed when filling type, impacting, splash phenomena, decrease the formation of oxidizing slag, avoid or reduce casting defect, improve motor casing castability.The chilling action of stable electromagnetic pump low-pressure casting low pressure casting and zircon sand type, the comprehensive mechanical performance of foundry goods is well improved, and decreases the casting flaw of aluminium casting, improves dimensional accuracy and the surface quality of foundry goods.
Electromagnetic pump low-pressure casting process can control pressing speed in conjunction with foundry goods feature by regulating the size of electric current easily and accurately, makes aluminium alloy fill type steady, decreases the formation of oxidizing slag, avoid casting defect.Electromagnetic pump low-pressure casting low pressure casting system architecture is simple, and it is convenient to control, and easily realizes computer automation programme-control, reduces labour intensity, improve foundry work environment.
The present invention is not limited to above-mentioned embodiment, adopts or approximation method identical with the above embodiment of the present invention or device, and other automobile electric casing low-pressure casting methods obtained and motor casing structure, all within protection scope of the present invention.
Claims (10)
1. an automobile electric casing low-pressure casting method, is characterized in that, it comprises the following steps:
(1) prepare the sand core structure of spiral channel, this sand core structure is that the identical semi arch structure core in two, left and right is oppositely spliced, and this sand core structure is provided with two the vertical locating pieces in left and right;
(2) sand core structure is placed into the counterdie of compression mod, two vertical locating pieces of sand core structure and counterdie are located mutually;
(3) by low-pressure casting apparatus, the automobile electric casing with spiral channel sand core structure is cast out;
(4) described for step (3) automobile electric casing is passed through heat treatment, make automobile electric casing reach corresponding hardness, then sand is vibrated out, electric motor of automobile hull shape becomes complete spiral channel;
(5) by welding, the eyelet welding that the position of roughing sand cored structure on the sidewall of the automobile electric casing of step (4) is formed is connect completion, form the complete automobile electric casing with spiral channel.
2. automobile electric casing low-pressure casting method according to claim 1, it is characterized in that, in described step (1), the parallel semi arch sand roads being provided with many inclinations in the middle part of described semi arch structure core, are provided with lateral connection portion between every bar semi arch sand road and vertical locating piece.
3. automobile electric casing low-pressure casting method according to claim 1, it is characterized in that, in described step (1), described sand core structure be 84% zircon sand, 15% phenolic resins, 1% dispersant be mixed with and form, at sand core structure surface spraying alcohol-base paint, form core smooth surface protective layer;
Described step (4) specifically also comprises following content: the heat treatment 7 hours automobile electric casing being carried out 530 degrees Celsius, automobile electric casing entirety is immersed in cold water, automobile electric casing is cooled fast, and vibration automobile electric casing, the defeated and dispersed one-tenth graininess of core flows out.
4. automobile electric casing low-pressure casting method according to claim 2, it is characterized in that, described step (5) also comprises following content: by the heat treatment of automobile electric casing and after sand is shaken out, the lateral connection portion of sand core structure makes the electric motor of automobile shell side wall of low pressure casting form multiple through hole be communicated with spiral channel, by welding, through hole is closed, form the automobile electric casing of the spiral channel of complete connection.
5. automobile electric casing low-pressure casting method according to claim 1, it is characterized in that, in described step (3), in low-pressure casting apparatus, be provided with the first boiler and the second boiler, the aluminium water of melting in the first boiler is ZL101 alloy, the aluminium water of melting in the second boiler is zl108 alloy or A356-2 alloy, in the second boiler, is provided with agitating device, in aluminium fusion process, stir until it is watered into mold continuously;
Two pot in-furnace temperature are 630 ~ 650 degrees Celsius, ensure that filling type smoothly can reduce again and ooze iron; The metal outer mold of low pressure casting is 80 ~ 100 degrees Celsius, and core is 160 ~ 180 degrees Celsius, and bed die is 200 ~ 300 degrees Celsius, and stalk is incubated 400 ~ 500 degrees Celsius;
In product casting process, carry out filling type continuously through air pressure or electromagnetic pump pressure, until water into mold by aluminium water, the pressure reaching 900 person of outstanding talent's bar makes formed product.
6. automobile electric casing low-pressure casting method according to claim 5, it is characterized in that, in described step (3), in low-pressure casting apparatus, pass into inert gas, make mineralization pressure between the aluminium water of the melting in the first boiler and compression mod die cavity poor, aluminium water enters in die cavity by stalk, by not solidified center aluminium water impouring boiler after die cavity inwall and sand core structure outer wall form skim solidified shell, in the several seconds, the aluminium water of the melting in the second boiler is injected in mold the remainder being full of mold under stress.
7. automobile electric casing low-pressure casting method according to claim 5, it is characterized in that, in described step (3), in low-pressure casting apparatus, two boilers are respectively equipped with electromagnetic pump, the aluminium water of the melting in the first boiler is filled in die cavity by electromagnetic pump, by not solidified center aluminium water impouring boiler after die cavity inwall and sand core structure outer wall form skim solidified shell, at another electromagnetic pump of several seconds, the aluminium water of the melting in the second boiler is injected in mold the remainder being full of mold under stress.
8. one kind implements the claims the motor casing structure of one of 1 to 7 described automobile electric casing low-pressure casting method, it is characterized in that, it comprises the motor casing body of low pressure casting, spiral channel structure is formed in this body, described spiral channel structure is fixed on counterdie by spiral channel sand core structure and casting is motor casing body, motor casing body is heat-treated and cooled fast, and spiral channel sand core structure is naturally defeated and dispersed and flow out, and forms the spiral channel structure that motor casing inner body wall is smooth.
9. motor casing structure according to claim 8, is characterized in that, described spiral channel structure is provided with water inlet and delivery port;
Described spiral channel sand core structure is that the identical semi arch structure core in two, left and right is oppositely spliced, and parallelly in the middle part of described semi arch structure core is provided with many semi arch sand roads tilted.
10. motor casing structure according to claim 9, is characterized in that, described semi arch structure core is provided with two the vertical locating pieces in left and right, is provided with lateral connection portion between every bar semi arch sand road and vertical locating piece.
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