CN104999051B - Electric motor of automobile shell low-pressure casting method and motor shell structure - Google Patents
Electric motor of automobile shell low-pressure casting method and motor shell structure Download PDFInfo
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- CN104999051B CN104999051B CN201510439370.XA CN201510439370A CN104999051B CN 104999051 B CN104999051 B CN 104999051B CN 201510439370 A CN201510439370 A CN 201510439370A CN 104999051 B CN104999051 B CN 104999051B
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Abstract
The invention discloses a kind of electric motor of automobile shell low-pressure casting method, it is comprised the following steps：(1) sand core structure of spiral channel is prepared；(2) sand core structure is placed into the lower mould of compression mod；(3) by low-pressure casting apparatus, the electric motor of automobile shell with spiral channel sand core structure is cast out；(4) electric motor of automobile shell then is vibrated out by heat treatment sand, electric motor of automobile hull shape is into complete spiral channel；(5) eyelet welding for being formed by welding the position of roughing sand cored structure on the side wall by electric motor of automobile shell connects completion, forms the complete electric motor of automobile shell with spiral channel.The invention also discloses motor shell structure.The present invention passes through electric motor of automobile shell low-pressure casting method, using aluminum alloy low-pressure casting process, and spiral channel is cast as by spiral channel core, ensure the cooling effect of motor, greatly improve the use time of motor, automobile can be met to work for a long time, and whole motor weight saving about 60%.
Description
Technical field
The present invention relates to the technical field of motor casing casting, and in particular to a kind of electric motor of automobile shell low-pressure casting method, and
Implement the motor shell structure of the casting method.
Background technology
Foundry Production is the important method of production machinery part or part blank in machine building industry.Casting refers to system
Casting mold, smelting metal are made, and molten metal bath is poured into, and there is the casting mold die cavity similar to part shape to treat its cooled and solidified
Afterwards, the method for obtaining the metalwork (casting) of definite shape and performance.Most of sprays are needed again by machining system
Into machine components.Under certain process conditions, casting can also be produced cuts precision component blank or the part without cutting less.Casting
Shaping is substantially to realize shaping using the mobile performance of motlten metal.
In automobile manufacturing process, the part for being made blank using cast iron is a lot, accounts for full car weight amount 10% or so, starts
Box body, mission case.Manufacture ironcasting generally uses sand mold.The raw material of sand mold based on sand, and with binding agent, water etc.
Mix.Sand mould material must have certain bonding strength, to be moulded required shape and to resist high temperature liquid iron
Wash away without avalanche.In order to be moulded the cavity being consistent with cast shape in sand mold, it is necessary to be first made model with timber, claim
It is wooden model.Volume can reduce after red-hot molten iron cooling, therefore, the size of wooden model is needed on the basis of casting full size by receipts
Shrinkage is increased, it is necessary to the surface of machining accordingly thickeies.
Sand casting be using molding sand be main material as casting mold, and rely on liquid metal own wt and mobility,
Filling cast under Action of Gravity Field, carries out the process of castings production.Sand casting is a kind of most widely used casting method,
Its master operation includes：Manufacture apperance, prepares Modeling Material, moulding, makes core, mould assembly, melting, cast, knockout, cleaning and inspection
Deng.Steel, iron and most of non-ferrous alloy castings can all be obtained with sand mould casting method.Due to the Modeling Material used by sand casting
Cheap and easy to get, Casting mold manufacturing is easy, single-piece production to casting, produces by batch and largely produces and adapt to, for a long time,
Basic technology always in Foundry Production.
Conventional motors shell uses the technique of rivet welding, and polylith splicing welding assembly is a casing, and manufacturing process is complicated, efficiency
Low, it is impossible to form standardization, welding position is more, and product appearance defect is more.And the electricity that new-energy automobile on the market is used at present
Power drives, and the housing of its motor makes according to cast iron, and not only weight is big, and cooling effect is not good, the poor thermal conductivity of steel,
Radiating is slow, influences electric efficiency, is unfavorable for the long-play of automobile.Accordingly, it would be desirable to research and develop a good heat dissipation effect of making, hold
Light motor shell durable long.
The content of the invention
It is not enough that this invention is directed to current art, there is provided a kind of electric motor of automobile shell low-pressure casting method, manufacturing process letter
List, efficiency high, can in batch produce that mass is high, good cooling results motor casings.
The present invention also provides a kind of motor shell structure for implementing the casting method.
The technical scheme that is used to achieve the above object of the present invention is：
A kind of electric motor of automobile shell low-pressure casting method, it is comprised the following steps：
(1) sand core structure of spiral channel is prepared, the sand core structure is anti-for the two identical semi arch structure cores in left and right
To being spliced, the sand core structure is provided with the two vertical locating pieces in left and right；
(2) sand core structure is placed into the lower mould of compression mod, two vertical locating pieces of sand core structure are mutually fixed with lower mould
Position；
(3) by low-pressure casting apparatus, the electric motor of automobile shell with spiral channel sand core structure is cast out；
(4) by step (3) the electric motor of automobile shell by heat treatment, electric motor of automobile shell is made to reach corresponding hardness, then
Sand vibrates out, and electric motor of automobile hull shape is into complete spiral channel；
(5) by weld by the side wall of the electric motor of automobile shell of step (4) roughing sand cored structure position formed eyelet welding connect
Completion, forms the complete electric motor of automobile shell with spiral channel.
As a further improvement, in the step (1), the sand core structure is that two identical semi arch structure cores are anti-
To being spliced；Semi arch structure core middle part is parallel to be provided with a plurality of inclined semi arch sand road, every semi arch sand road with it is perpendicular
To being provided with lateral connection portion between locating piece.
As a further improvement, in the step (1), described sand core structure be 84% zircon sand, 15% phenolic resin,
1% dispersant is mixed with and forms, and in sand core structure surface spraying alcohol-base paint, forms core surface smooth protection layer；
The step (4) is specific also to include herein below：Electric motor of automobile shell is carried out 530 degrees Celsius of heat treatment 7 hours,
Electric motor of automobile shell is integrally immersed in cold water, electric motor of automobile shell is quickly cooled down, vibrate electric motor of automobile shell, core it is defeated and dispersed into
Granular outflow.
As a further improvement, the step (5) also includes herein below：Electric motor of automobile shell is heat-treated and sand is shaken
After coming, the lateral connection portion of sand core structure causes that the electric motor of automobile shell side wall of low pressure casting forms what multiple was connected with spiral channel
Through hole, is closed through hole by welding, and forms the electric motor of automobile shell of the spiral channel of complete connection.
In the step (3), in low-pressure casting apparatus, melting in the first boiler and the second boiler, the first boiler is provided with
Aluminium water is that the aluminium water of melting in ZL101 alloys, the second boiler is zl108 alloy or A356-2 alloys, in the second boiler, is provided with
Agitating device, in aluminium fusion process, continuously stirs and is poured into mold until by it；
Two pot in-furnace temperatures are 630~650 degrees Celsius, it is ensured that smoothly fill type and can reduce and ooze iron；Low pressure casting
Metal outer mold be 80~100 degrees Celsius, core be 160~180 degrees Celsius, bed die be 200~300 degrees Celsius, stalk protect
Temperature is to 400~500 degrees Celsius；
In product casting process, carry out filling type continuously through air pressure or electromagnetism pump pressure, until by aluminium water pour into
Mold, the pressure for reaching 900 millibars makes formed product.
As a further improvement, in the step (3), in low-pressure casting apparatus, being passed through inert gas, make in the first boiler
Melting aluminium water and compression mod die cavity between form pressure differential, aluminium water is entered into die cavity by stalk, in die cavity inwall
And not solidified center aluminium water is poured into boiler after formation a thin layer solidified shell on sand core structure outer wall, in the several seconds (10~30
Second) the aluminium water of the melting in the second boiler is injected into mold the remainder full of mold under stress.
As a further improvement, in the step (3), in low-pressure casting apparatus, two boilers are respectively equipped with electromagnetic pump, electricity
Be filled into the aluminium water of the melting in the first boiler in die cavity by magnetic pumping, and a thin layer is formed on die cavity inwall and sand core structure outer wall
Not solidified center aluminium water is poured into boiler after solidified shell, in several seconds (10~30 seconds) another electromagnetic pump by the second boiler
The aluminium water of melting is injected into the remainder full of mold in mold under stress.
A kind of motor shell structure for implementing above-mentioned electric motor of automobile shell low-pressure casting method, it includes the motor of low pressure casting
Shell body, forms spiral channel structure in the body, and the spiral channel structure is fixed on down by spiral channel sand core structure
Simultaneously casting is motor casing body to mould, motor casing body is heat-treated and is quickly cooled down, and spiral channel sand core structure is certainly
It is so defeated and dispersed and flow out, form the smooth spiral channel structure of motor casing inner body wall.
The spiral channel structure is provided with water inlet and delivery port；
The sand core structure is reversely spliced for the two identical semi arch structure cores in left and right, the semi arch structure
Core middle part is parallel to be provided with a plurality of inclined semi arch sand road.
The semi arch structure core be provided with left and right two vertical locating pieces, every semi arch sand road and vertical locating piece it
Between be provided with lateral connection portion.
Beneficial effects of the present invention：For the demand of existing new energy development, by electric motor of automobile shell low-pressure casting method,
Solve motor casing batch production and improve the efficiency of motor, using aluminum alloy low-pressure casting process, and by spiral channel
Core is cast as spiral channel, it is ensured that the cooling effect of motor, and aluminium alloy casting global formation outward appearance compares conventional bonding technique
Attractive in appearance, good cooling results lift 6 electric efficiencies of point than traditional technique, and aluminium alloy heat transfer is fast, and rapid heat dissipation adds spiral
The circulating cooling water channel of formula, solves the problem of temperature rise of motor, greatly improves the use time of motor, can meet automobile
Prolonged work, and aluminum alloy low-pressure casting technological forming than traditional welded steel handicraft product more lightweight,
Whole motor weight saving about 60%.
Below in conjunction with the accompanying drawings with specific embodiment, the present invention is described in more detail.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present embodiment motor shell structure；
Fig. 2 is the structural representation of the present embodiment motor shell 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 overlooking the structure diagram；
Fig. 6 is the structural representation that the present embodiment sand core structure is positioned with lower mould.
In figure：1. motor casing body, 2. spiral channel structure, 3. sand core structure, 31. semi arch structure cores, 32. semicircles
Hu Sha roads, 33. vertical locating pieces, 34. lateral connection portions 4. descend mould.
Specific embodiment
Embodiment, referring to the electric motor of automobile shell low-pressure casting method that Fig. 1~6, the present embodiment provide, it includes following step
Suddenly：
(1) sand core structure 3 of spiral channel is prepared, the sand core structure 3 is the two identical semi arch structure cores in left and right
31 are reversely spliced, and the sand core structure 3 is provided with the two vertical locating pieces 33 in left and right；The middle part of semi arch structure core 31 is parallel to be set
There is a plurality of inclined semi arch sand road 32, lateral connection portion 34 is provided between every semi arch sand road 32 and vertical locating piece 33；
Semi arch structure core 31 is easy to the core of the indifference batch micro operations of core, the arcuate structure of any two half can reversely to splice
Form a complete sand core structure 3；
(2) sand core structure 3 is placed into the lower mould 4 of compression mod, two vertical locating pieces 33 of sand core structure 3 and lower mould 4
It is mutually located；
(3) by low-pressure casting apparatus, the electric motor of automobile shell with spiral channel sand core structure 3 is cast out；
(4) by step (3) the electric motor of automobile shell by heat treatment, electric motor of automobile shell is made to reach corresponding hardness, then
Sand vibrates out, and electric motor of automobile hull shape is into complete spiral channel；Specific operating procedure is that electric motor of automobile shell is carried out into 530 to take the photograph
The heat treatment of family name's degree 7 hours, electric motor of automobile shell is integrally submerged in 5~15 degrees Celsius of cold water, makes electric motor of automobile shell quick
Cooling, vibrates electric motor of automobile shell, and core is defeated and dispersed into graininess outflow；
(5) after being heat-treated electric motor of automobile shell and sand is shaken out, the lateral connection portion 34 of sand core structure 3 causes low pressure casting
The electric motor of automobile shell side wall made forms multiple through holes connected with spiral channel, is closed through hole by welding, and formation completely connects
The electric motor of automobile shell of logical spiral channel.
In the step (1), described sand core structure 3 is 84% zircon sand, 15% phenolic resin, the mixing of 1% dispersant
Compacting is formed, and in the surface spraying alcohol-base paint of sand core structure 3, forms core surface smooth protection layer, carries out formation during die casting
Electric motor of automobile shell water channel inner wall smooth, not scab.The motor casing of new energy electric motor vehicle belongs to large complicated aluminium alloy castings, at present
The molding and core making material of use easily produces the casting flaws such as stomata, seepage, scab；Casting dimension accuracy is low；Surface quality is poor.
Zircon sand/PEPSET resin self-setting sand response lags, good fluidity, complicated casting mold die cavity is clear-cut；Once sclerous reaction starts,
Setting rate is fast, and intensity is high, and scab is difficult during molding, and surface quality is good；Gas-forming property is small, can reduce blow hole defect；It is defeated and dispersed
Property it is good, cast cleaning easily, can greatly reduce casting cleaning workload, improve the working condition of workman.Using zircon sand/PEPSET
Resin self-setting sand makees the gentle road core density of water channel greatly, swashs coefficient of thermal expansion very little, does not have mold wall moving, casting die cavity chi during cast
Very little to be easily guaranteed that, high precision can prevent seepage；Further, since the heat storage capacity of zirconium self-curing mo(u)ld is strong, be conducive to improving casting
Mechanical performance and anti-fatigue performance.Using zircon sand/PEPSET resin self-setting sand corings, casting defect is reduced, improve casting
Dimensional accuracy and surface quality, improve casting combination property.
In the step (3), in low-pressure casting apparatus, melting in the first boiler and the second boiler, the first boiler is provided with
Aluminium water is ZL101 alloys, and main chemical compositions (mass fraction) are 6.5%~7.5% Si, 0.25%~0.45% Mg,
Remaining is Al, zero defect, high-quality casting outer wall is formed after ZL101 alloy low pressure castings, with good strength character；
The aluminium water of melting is zl108 alloy in second boiler, and main chemical compositions (mass fraction) are 11%~13%
Si, 0.4%~1.0% Mg, 1.0%~2.0% Cu, 0.3%~0.9% Mn, remaining is Al, impurity F e≤0.7%,
Silicon is added to improve the mobility of alloy in aluminium, so that with good Feeding Characteristics, low-shrinkage and good thermal crack resistant
Performance；The aluminium water of melting is alternatively A356-2 alloys in second boiler.
Major part alusil alloy has been used for producing Al-SiC at presentpParticles reiforced metal-base composition, but usual
In fusion process, SiC and Al reaction productions Al4C3, its mechanical performance to casting is very harmful, the content of Si more than 8% just
Al can be prevented4C3Formation.Therefore, in the second boiler, be provided with agitating device, in aluminium fusion process, continuously stir until
It is poured into mold so that Si dissolves in the alloy to greatest extent, and prevent Al4C3Formation.Meanwhile, the aluminium of high Si content
Alloy (i.e. hypereutectic aluminium alloy) has low coefficient of thermal expansion, and pyroconductivity and relatively low density high manufacture light weight
Electric motor of automobile shell, mitigates the weight of automobile.
Two pot in-furnace temperatures are 630~650 degrees Celsius, it is ensured that fill type and can reduce and ooze iron；Metal outer mold is 80
~100 degrees Celsius, core is 160~180 degrees Celsius, and bed die is 200~300 degrees Celsius, and stalk insulation is taken the photograph to 400~500
Family name's degree, beneficial to the top-down consecutive solidification of casting；
In low-pressure casting apparatus, inert gas is passed through, made between the aluminium water of melting in the first boiler and compression mod die cavity
Pressure differential is formed, aluminium water is entered into die cavity by stalk, a thin layer is formed on die cavity inwall and the outer wall of sand core structure 3 and is coagulated
Gu not solidified center aluminium water is poured into boiler after shell, in the several seconds (10~30 seconds) the aluminium water of the melting in the second boiler
The remainder full of mold in mold is injected under stress.Twice in cavity filling process, pressure reaches 900 millibars.
During low pressure casting, first by the full mold of the first alloy solution casting, treat that the alloy solidifies to be formed in die wall
After the solid shell of a thin layer will not solidified core solution be poured into the first boiler, by the alloy solution of the second boiler within the several seconds
The remainder full of mold in the mold is injected, the product so cast, its composition little by little becomes from a surface to center portion
Change, and in the absence of discontinuous interface, and the material of graded has different material properties on this composition, makes
The electric motor of automobile hull shape of casting of the present invention is obtained into zero defect, quality casting outer wall high, and with good strength character, automobile
Motor casing central part has low coefficient of thermal expansion, pyroconductivity high and relatively low density, effectively reduces total quality, carries
High-heat conductive efficency.
In the present embodiment, before electric motor of automobile shell carries out die casting, using computer numerical simulation, by low pressure
Cast member fills type carries out calculating analysis with process of setting, dynamically observes the overall process of Filling Processes of Castings and the situation of change of temperature,
The defect such as casting shrinkage cavity, loose is effectively prevented, casting quality and yield rate is improved.
Low pressure casting part fills type and Solidification Process Simulation, and casting is obtained accurately just by numerical simulation during filling mold
Beginning thermo parameters method, sets up the Mathematical Modeling conducted heat in casting solidification process, and is solved by numerical method, and type is filled in raising
Casting Solidification Numerical Simulation and the precision of failure prediction, so as to obtain the rule of casting solidification process, predict that casting lacks afterwards
Fall into possibility, size and location that (shrinkage cavity, loose) is produced.
Casting low pressure casting cavity filling process and temperature field are simulated using FEM-software ANSYS, using SOLA-
VOF method for numerical simulation and finite element algorithm, filling and solidification processess numerical simulation is carried out to low pressure casting part.Specific steps
It is as follows：The low pressure casting physical model of electric motor of automobile shell casting is set up by ANSYS first, mesh generation is carried out to model, adopted
Flow of fluid and its heat transfer of the aluminium alloy castings in low pressure casting cavity filling process are simulated with ANSYS finite element analysis softwares, it is whole
Individual filling time is about 6S, molten metal after the die cavity die cavity for being fixed with spiral channel core is entered into, in the inner surface of die cavity
And thermal capacitance is smaller at core surface, cooling velocity is very fast, and molten metal change in flow is larger, and liquid metal filling front end flow velocity is steady,
Keep laminar flow stable state to be filled with die cavity, liquid metal filling front end flow velocity is steady, keep laminar flow stable state to be filled with die cavity, cast relative to gravity
Making reduces because molten metal topples over the casting flaws such as the oxide slag inclusion for washing away splash zone, improves casting quality.
Then, by setting temperature numerical simulation, because the thermo parameters method filled after type terminates is uneven, calculate
The maximum temperature of casting is 927.94K in time, and minimum temperature is 544K, and due to using low-pressure casting process, rising pouring is filled
Type, bottom is slower near cooling velocity at cast gate, and temperature is than high elsewhere.The casting outer wall and in the core in 20s
Wall part solidifies completely, formed a complete motor casing thin layer solidified shell, then will be not solidified in thin layer solidified shell in
Heart aluminium water is poured into the first boiler, and and then the aluminium water in the second boiler is filled into motor casing thin layer solidified shell, and pressurize is coagulated
Gu the rear demoulding, completes the low pressure casting shaping of complete electric motor of automobile shell.
The present embodiment also provides a kind of motor shell structure for implementing electric motor of automobile shell low-pressure casting method, and it includes that low pressure is cast
The motor casing body 1 made, forms spiral channel structure 2 in the body, and the spiral channel structure 2 is by spiral channel core knot
Structure 3 is fixed on lower mould 4 and casting is motor casing body 1, and motor casing body 1 is heat-treated and is quickly cooled down, core
Structure 3 is naturally defeated and dispersed and flows out, and forms the spiral channel structure 2 of the inner wall smooth of motor casing body 1.
The spiral channel structure 2 is provided with water inlet and delivery port；The sand core structure 3 is the two identical semicircles in left and right
Arc structure core 31 is reversely spliced, and the middle part of the semi arch structure core 31 is parallel to be provided with a plurality of inclined semi arch sand road
32。
The semi arch structure core 31 is provided with the two vertical locating pieces 33 in left and right, and every semi arch sand road 32 is fixed with vertical
Lateral connection portion 34 is provided between the block 33 of position, after two identical semi arch structure cores 31 reversely splice, two and half
The vertical locating piece 33 of arc structure core 31 is mutually adjacent to, and forms the locating piece of sand core structure 3.
Electric motor of automobile shell complex-shaped and technical requirements are high, has air-tightness to require, casting physical dimension is complicated, dimensioning
It is very little to require height.Cast(ing) surface and inherent quality requirement are high；Surface is smooth, flat surface roughness is small.Processing datum is without any
Defect, cast(ing) surface, inner chamber overlap, burr requirement are high.Casting is not allow for the casting such as scab, crackle, sand holes, stomata, shrinkage porosite
Defect, is that processing rationalizes validation so using sand casting and coordinating certain technological design and control method, obtains high
The casting of quality.
Embodiment 2, the present embodiment is substantially same as Example 1, and its difference is that the low pressure described in step (3) is cast
Make in device, two boilers are respectively equipped with electromagnetic pump, be filled into the aluminium water of the melting in the first boiler in die cavity by electromagnetic pump,
Formed the first boiler of not solidified center aluminium water back flow on die cavity inwall and the outer wall of sand core structure 3 after a thin layer solidified shell,
Be injected into mold the aluminium water of the melting in the second boiler full of casting under stress by several seconds (10~30 seconds) another electromagnetic pump
The remainder of mould.Twice in cavity filling process, pressure reaches 900 millibars.
Electromagnetic pump is the effect using electric current and magnetic field in conductor fluid, and electromagnetic propulsion power (Loulun magnetism) is directly made
With on metal liquid, being allowed to displacement.Electromagnetic pump low-pressure casting low pressure casting system can make Al liquid with it is extraneous completely every
Liter liquid is carried out in the state of absolutely and type is filled, makes Al liquid and H2、O2The condition of contact completely loses, and is conducive to raising aluminium alloy pure
Degree, obtains high-quality low pressure casting；Compared with existing vapour-pressure type low-pressure die casting plant, the system rises liquid, fills without air pressure
Type；During cast, liter liquid and filling velocity can be efficiently controlled by adjusting the size of electric current, aluminium alloy is filled type steadily, reduced
Or avoid vapour-pressure type low pressure casting aluminium alloy is seethed when type is filled due to air pressure fluctuation, impact, splash phenomena, reduce oxidation
The formation of slag, it is to avoid or casting defect is reduced, improve motor casing castability.Stable electromagnetic pump low-pressure casting low pressure casting and zirconium
The chilling action of sand mold, the comprehensive mechanical performance of casting is well improved, and reduces the casting flaw of aluminium casting, improves casting
The dimensional accuracy and surface quality of part.
Electromagnetic pump low-pressure casting process can easily and accurately control pressing speed with reference to casting feature by adjusting the size of electric current,
Aluminium alloy is filled type steady, reduce the formation of oxidizing slag, it is to avoid casting defect.Electromagnetic pump low-pressure casting low pressure casting system architecture
Simply, it is easy to control, computer automation programme-control is easily realized, labour intensity is reduced, improve foundry work environment.
The present invention is not limited to above-mentioned implementation method, using or approximation method identical with the above embodiment of the present invention or dress
Put, and other electric motor of automobile shell low-pressure casting methods and motor shell structure for obtaining, within protection scope of the present invention.
Claims (9)
1. a kind of electric motor of automobile shell low-pressure casting method, it is characterised in that it is comprised the following steps：
(1) sand core structure of spiral channel is prepared, the sand core structure is reversely spelled for the two identical semi arch structure cores in left and right
Connect and form, the sand core structure is provided with the two vertical locating pieces in left and right；
(2) sand core structure is placed into the lower mould of compression mod, two vertical locating pieces of sand core structure are mutually located with lower mould；
(3) by low-pressure casting apparatus, the electric motor of automobile shell with spiral channel sand core structure is cast out；
(4) electric motor of automobile shell is made to reach corresponding hardness, then sand is shaken by heat treatment on step (3) the electric motor of automobile shell
It is dynamic out, electric motor of automobile hull shape is into complete spiral channel；
(5) by weld by the side wall of the electric motor of automobile shell of step (4) roughing sand cored structure position formed eyelet welding connect completion,
Form the complete electric motor of automobile shell with spiral channel.
2. electric motor of automobile shell low-pressure casting method according to claim 1, it is characterised in that described in the step (1)
Semi arch structure core middle part is parallel to be provided with a plurality of inclined semi arch sand road, between every semi arch sand road and vertical locating piece
It is provided with lateral connection portion.
3. electric motor of automobile shell low-pressure casting method according to claim 1, it is characterised in that described in the step (1)
Sand core structure be 84% zircon sand, 15% phenolic resin, 1% dispersant be mixed with and form, in sand core structure surface spraying
Alcohol-base paint, forms core surface smooth protection layer；
The step (4) is specific also to include herein below：Electric motor of automobile shell is carried out 530 degrees Celsius of heat treatment 7 hours, by vapour
Vehicle motor shell is integrally immersed in cold water, electric motor of automobile shell is quickly cooled down, and vibrates electric motor of automobile shell, and core is defeated and dispersed into graininess
Outflow.
4. electric motor of automobile shell low-pressure casting method according to claim 2, it is characterised in that the step (5) also includes
Herein below：After being heat-treated electric motor of automobile shell and sand is shaken out, the lateral connection portion of sand core structure causes low pressure casting
Electric motor of automobile shell side wall forms multiple through holes connected with spiral channel, is closed through hole by welding, and forms complete connection
The electric motor of automobile shell of spiral channel.
5. electric motor of automobile shell low-pressure casting method according to claim 1, it is characterised in that in the step (3), low pressure
In casting device, the aluminium water for being provided with melting in the first boiler and the second boiler, the first boiler is ZL101 alloys, in the second boiler
The aluminium water of melting is zl108 alloy or A356-2 alloys, in the second boiler, is provided with agitating device, in aluminium fusion process,
Continuously stir and poured into mold until by it；
Two pot in-furnace temperatures are 630~650 degrees Celsius, it is ensured that smoothly fill type and can reduce and ooze iron；The gold of low pressure casting
Category external mold is 80~100 degrees Celsius, and core is 160~180 degrees Celsius, and bed die is 200~300 degrees Celsius, and stalk insulation is arrived
400~500 degrees Celsius；
In product casting process, carry out filling type continuously through air pressure or electromagnetism pump pressure, poured into mold until by aluminium water,
The pressure for reaching 900 millibars makes formed product.
6. electric motor of automobile shell low-pressure casting method according to claim 5, it is characterised in that in the step (3), low pressure
In casting device, inert gas is passed through, makes to form pressure differential, aluminium between the aluminium water of the melting in the first boiler and compression mod die cavity
Water is entered into die cavity by stalk, will not solidified after forming a thin layer solidified shell on die cavity inwall and sand core structure outer wall
Center aluminium water be poured into boiler, the several seconds the aluminium water of the melting in the second boiler be injected under stress in mold full of casting
The remainder of mould.
7. electric motor of automobile shell low-pressure casting method according to claim 5, it is characterised in that in the step (3), low pressure
In casting device, two boilers are respectively equipped with electromagnetic pump, and be filled into the aluminium water of the melting in the first boiler in die cavity by electromagnetic pump,
Not solidified center aluminium water is poured into boiler after forming a thin layer solidified shell on die cavity inwall and sand core structure outer wall, in the several seconds
The aluminium water of the melting in the second boiler is injected into mold the remainder full of mold by another electromagnetic pump of clock under stress.
8. a kind of motor shell structure for implementing one of claim 1 to 7 electric motor of automobile shell low-pressure casting method, its feature exists
In it includes the motor casing body of low pressure casting, and spiral channel structure is formed in the body, and motor casing body is carried out into hot place
Reason and quick cooling, spiral channel sand core structure is naturally defeated and dispersed and flows out, and forms the smooth spiral channel of motor casing inner body wall
Structure.
9. motor shell structure according to claim 8, it is characterised in that the spiral channel structure is provided with water inlet and goes out
The mouth of a river.
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