CN110355332A - A kind of integration aluminium alloy instrument board skeleton forming method - Google Patents
A kind of integration aluminium alloy instrument board skeleton forming method Download PDFInfo
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- CN110355332A CN110355332A CN201910762397.0A CN201910762397A CN110355332A CN 110355332 A CN110355332 A CN 110355332A CN 201910762397 A CN201910762397 A CN 201910762397A CN 110355332 A CN110355332 A CN 110355332A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
Abstract
The present invention relates to car body component related fieldss, disclose a kind of integrated aluminium alloy instrument board skeleton forming method.Integrated aluminium alloy instrument board skeleton forming method includes the following steps: the three-dimensional structure of design integration aluminium alloy instrument board skeleton.Design mode shell structure and model casting running gate system, for injecting molten metal in the type chamber to shell interior.Model casting running gate system includes sprue, cross gate and ingate.Carry out corresponding running channel design respectively to sprue, cross gate and ingate.Determine the corresponding process parameters of casting technique.Shell is poured using model casting running gate system.The instrument board skeleton of monoblock type is made using the technique of the structure-integrated design method combination model casting of material-by the present invention.The interaction of integral structure each section, good integrity, the rigidity of structure is larger, is conducive to play a supporting role.The instrument board skeleton of integral structure reduces the process of each section connection, saves raw material, is conducive to economize on resources.
Description
Technical field
The present invention relates to car body component related fields more particularly to a kind of integrated aluminium alloy instrument board skeleton forming sides
Method.
Background technique
Instrument panel framework is the main load bearing component of automobile center console, plays and supports and fixes instrument disc assembly and its
The effect of his attachment.Orthodox car instrument board skeleton is made of many small components, and the general type of automobile instrument panel is
On the crossbeam that one is fixed at left and right sides of body of a motor car, by welding, the methods of rivets various pieces and be bolted
It links together, plays the role of supporting and fixing instrument disc assembly, steering module, air-conditioning module, LCD MODULE etc..By
The effect for supporting and fixing middle each module of control is primarily served in instrument board skeleton, so most importantly guaranteeing instrument in design
The rigidity of structure of disk skeleton, the rigidity of structure are defined as skeleton and are mounted on vehicle body, and steering column is connected on skeleton by bracket
(steering system is as rigid treatment), by resistance capacity to deformation when vertical force and lateral force at steering wheel.
The instrument board skeleton of traditional scheme is spliced by multiple portions, and globality and the rigidity of structure are poor, in stress and
In the case where load, it be easy to cause bending deformation.And it due to the coincidence of the splicing Structure of need between multi-section sub-unit, can lead
Cause the waste of raw material.And Hyundai Motor design is under the premise of meeting safety, can be raising fuel economy, automobile
Lightweight research is the key factor of Hyundai Motor design, therefore, because the automobile instrument panel selected materials of traditional scheme are most
The reason of for traditional Steel material, the quality that will cause instrument board is larger, is unfavorable for the lightweight of vehicle.
Summary of the invention
Problem in view of the prior art, the present invention provide a kind of integrated aluminium alloy instrument board skeleton forming method, energy
Instrument panel framework globality and the rigidity of structure are enough improved, while saving raw material, is conducive to the lightweight of automobile, to mention
The fuel economy of high automobile.
The present invention is implemented with the following technical solutions:
A kind of integration aluminium alloy instrument board skeleton forming method comprising following steps:
Step S1: the three-dimensional structure of design integration aluminium alloy instrument board skeleton；
Step S2: design mode shell structure and model casting running gate system, for injecting metal in the type chamber to shell interior
Liquid；Model casting running gate system includes sprue, cross gate and five ingates；
Step S3: corresponding running channel design is carried out respectively to sprue, cross gate and ingate；The input port of sprue supplies
One molten metal input；The middle part of cross gate has input port, and vertical with the delivery outlet of sprue and communicate；Five ingates
Delivery outlet corresponding with cross gate bottom is vertical respectively and communicates for input port, the delivery outlet of five ingates is respectively and on shell
The sprue gate that corresponding position opens up communicates, and sprue gate is connected to the intracavitary portion of type；
Step S4: determining the corresponding process parameters of casting technique, and technological parameter includes the type and thickness, shell of shell
The poring rate of preheating temperature, the pouring temperature of molten metal and molten metal；
Step S5: shell is poured using model casting running gate system；
Wherein, the poring rate modeling of molten metal are as follows:vIt fillsFor pouring metal melt speed, h is casting
Part height, δ are casting section thickness, t1For pouring metal melt temperature.
Further, in the step S2 molten metal be molten condition zAL114 aluminum alloy materials.
Further, the sectional area modeling of the sprue are as follows:
Wherein, AResistanceFor running gate system minimum sectional area, GLTo flow through AResistanceThe molten metal total weight of sectional area, t2When to be poured
Between, μ be flow loss coefficient,Height is thrown for average computation pressure.
Further, the area of section ratio of the sprue, cross gate and ingate is 1:1.25:3.
It further, further include Feeder Design in the step 3, riser, which is placed in, generates shrinkage porosite or shrinkage cavity on shell
Thermo-contact part or the position of wall thickness, to provide feeding when molten metal solidification intracavitary for type.
Further, the type of shell is silicasol case in the step S4.
Further, the preheating temperature range of shell is 100 DEG C to 400 DEG C in the step S4.
Further, the preheating temperature of the shell is 350 DEG C.
Further, the pouring temperature of molten metal is 710 DEG C in the step S4.
Further, blasting treatment is carried out to the casting inner surface after moulding by casting in the step S5.
The invention has the benefit that
1. the instrument that monoblock type is made using structure-material integrated design method combination model casting technique by the present invention
Disk skeleton.The interaction of monolithic construction each section, good integrity, the rigidity of structure is larger, is conducive to play a supporting role.Together
When, the instrument board skeleton of integral structure reduces the process of each section connection, saves raw material, is conducive to economize on resources.
2. the present invention using aluminum alloy materials instead of conventional steel material as the raw material of instrument board skeleton, the material
Density is smaller compared to the density of traditional steel, and light weight degree can reach 30% or so, to improve the fuel economy of automobile.
Detailed description of the invention
Fig. 1 is the flow diagram of integrated aluminium alloy instrument board skeleton forming method provided in an embodiment of the present invention；
Fig. 2 is the assembled state figure at one of visual angle of shell and running gate system in Fig. 1；
Fig. 3 is the assembled state figure at another of shell and running gate system visual angle in Fig. 1；
Fig. 4 is the structural schematic diagram after the integrated aluminium alloy instrument board skeleton forming in Fig. 1.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
Referring to Fig. 1, Fig. 1 is the process of integrated aluminium alloy instrument board skeleton forming method provided in an embodiment of the present invention
Schematic diagram.Integrated aluminium alloy instrument board skeleton forming method includes the following steps:
Step S1: the three-dimensional structure of design integration aluminium alloy instrument board skeleton；
Step S2: design mode shell structure and model casting running gate system, for injecting metal in the type chamber inside shell 1
Liquid；Model casting running gate system includes 2 cross gate 3 of sprue and five ingates 4；
Step S3: corresponding running channel design is carried out respectively to sprue 2, cross gate 3 and ingate 4；
Step S4: the corresponding process parameters of casting technique are determined；
Step S5: shell 1 is poured using model casting running gate system.
One, during step S1 design integration aluminium alloy instrument board matrix type shell structure, as obtained by shell 1
Casting (instrument board skeleton) will meet following quality requirement:
(1) it is not allow for cold shut, stomata, shrinkage cavity and porosity, crackle and other reduction casting strengths in casting and influences machine
Processing cutting, the defect positioned exist；
(2) casting after being opened should be cleaned out, and inner surface blasting treatment must not have overlap, burr；
(3) casting work surface allows to have the defect that can be eliminated within the scope of machine-finish allowance；
(4) cast article will check Internal Quality of Cast requirement through ray detection.
For requirements above, the present invention additionally considers the influence of liquid flow direction and speed during casting and pouring again,
And reduce the defect that bubble influences casting and pouring.The design of shell in the present embodiment as a result, it is necessary to meet above want
It asks.
Two, in step s 2:
(1) molten metal is the zAL114 aluminum alloy materials of molten condition.As shown in table 1 below, in zAL114 aluminum alloy materials
Each element composition.
Table 1
According to table 1, the element in zAL114 aluminum alloy materials mainly includes Si, Mg, Ti, Be and Al.
As shown in table 2 below, the mechanical property of zAL114 aluminum alloy materials.
| Material name | Elasticity modulus | Density | Poisson's ratio |
| zAL114 | 7.3x104Mpa | 2.65t/m2 | 0.33 |
Table 2
According to table 2, the elasticity modulus of zAL114 aluminum alloy materials, density and Poisson's ratio.ZAL114 aluminum alloy materials
Density is that 2.65t/m3 is about the 1/3 of traditional steel, is conducive to lightweight, to improve the fuel economy of automobile.
For traditional instrument board skeleton multi-section point connection, the poor effect of globality, the present invention is using integrated fusible pattern
The technique of casting processes instrument board skeleton, to obtain the instrument board skeleton of monoblock type.Monolithic construction each section phase
Interaction, good integrity, the rigidity of structure is larger, is conducive to play a supporting role.Founding materials select zAL114 aluminium alloy simultaneously
Material is conducive to automotive light weight technology, and integral structure has lacked the process of each section connection, to realize the effect for saving raw material
Fruit.
(2) determination about model casting running gate system
Incorporated by reference to Fig. 1 and Fig. 2, after the completion of the design of shell structure, need to carry out system for casting and pouring for shell structure
Design, model casting running gate system will guarantee that molten metal can be steadily rapidly in inflow type chamber, while have preferable exhaust
With feeding function, be conducive to the temperature field for adjusting molten metal solidification, and to there is enough intensity to play a supporting role fusible pattern, side
Just casting is cut.
Since instrument board skeleton structure is complex, in order to keep mold filling process of casting steady rapidly, guarantee that casting can be suitable
Sequence solidification, and running gate system can play the role of feeding, reduce casting flaw, model casting integrated cast structure is selected as in the present embodiment
Sprue-cross gate-ingate.
According to the difference of running channel section area ratio, integrated cast structure can also be divided into open integrated cast structure and enclosed pour
Infuse two kinds of forms of structure.The molten metal speed of inflow type chamber is higher in closed integrated cast structure, can have biggish impact to shell 1
And the molten metal flowed into is easy to aoxidize, and is not suitable for the aluminium alloy castings for being easy to aoxidize.And open integrated cast structure is due to metal
Liquid is in pressure-free flow state in integrated cast structure, and it is steady to fill type, small to type chamber scouring force, when can reduce aluminium alloy castings casting
The oxidation of molten metal, therefore model casting casting uses open integrated cast structure in the present embodiment.
According to different location of the ingate 4 in casting, model casting casting is using intermediate pouring-in knot in the present embodiment
Structure, i.e., at the middle part of casting by molten metal introducing type chamber, this pouring type liquid metal filling is more steady, can avoid because of metal
Liquid swashs the casting flaw splashed, aoxidize and formed.
The model casting running gate system in the present embodiment can be by sprue-cross gate-ingate structure, open as a result,
The combination of integrated cast structure and intermediate injection circuit formed.Wherein, the quantity of ingate 4 is set as five.Sprue 2 it is defeated
Enter confession one molten metal input, the middle part of cross gate 3 has an input port, and vertical with the delivery outlet of sprue 2 and communicate；Five
Delivery outlet corresponding with 3 bottom of cross gate is vertical respectively and communicates for the input port of a ingate 4, the delivery outlet of five ingates 4
The sprue gate opened up respectively with corresponding position on shell 1 communicates, and sprue gate is connected to the intracavitary portion of type.
(3) for the determination of casting position:
Pouring position refers to the positional relationship of running gate system and casting, is directly related to the position of molten metal introducing type chamber,
It is directly related to the quality of casting to reach the effectively process of setting full of type chamber and control casting, the selection of pouring position,
The selection of casting position should have on the whole to be conducive to fill type quick and stable, solidification sequence meets the requirements and guarantee casting quality.
The selection principle of pouring position is as follows:
1) surface important in casting should be located at lower part or side, and machined surface had better not be placed on top to guarantee surface matter
Amount；
2) the larger plane of casting should be downward to avoid inclusion defect；
3) guarantee the sequence feeding and filling of casting；
4) it is consistent casting compencation position as far as possible.
Three, in step s3:
Incorporated by reference to Fig. 1 to Fig. 3, (1) carries out corresponding running channel design for sprue, cross gate and ingate respectively, wraps
Include following steps:
1) Design of Gate, ingate are the channels that cross gate is connect with type chamber.The position of ingate, shape and area are big
The small flow regime for affecting molten metal has direct influence to the quality of casting.Design of Gate mainly includes ingate
Position, form and water conservancy diversion direction.
Multiple ingates are set, are conducive to filling of the molten metal to type chamber, while can be reduced casting misrun, cold shut, volume
The defects of gas.In view of the processing problems of successive castings, by sprue gate design on the side for the side wall and bottom for being relatively easy to processing
Edge, the later period, which need to only carry out simply machining, is achieved with the higher cast product of quality.
2) cross gate designs
Cross gate refers to the channel between the ingate from sprue delivery outlet to ingate.Its effect is made from sprue
The molten metal that stream comes can smoothly be transitioned into ingate with certain temperature, speed, pressure, and molten metal is made steadily to flow to filled-type
Chamber.Cross gate section uses cylindrical cross-section in the present invention, this cross sectional shape is easy to process.
3) sprue designs
Sprue is the pillar manufactured in shell, and takes into account the effect of riser in most cases.The function of sprue is: drawing
It leads molten metal and enters type chamber, enable molten metal smoothly full of shell.Sprue section form has very much, under being commonly made to greatly
Small taper.
(2) it is directed to the calculating of each running channel sectional area
The sectional area of sprue can model are as follows:Wherein, AResistanceFor running gate system minimum sectional area
(cm2), GLTo flow through AResistanceThe molten metal total weight (kg) of sectional area, t2For the duration of pouring, μ be flow loss coefficient,For
Average computation pressure throws height (cm).
Due to using open integrated cast structure herein, wherein ingate is five, and cross gate is one, then section of each running channel
Area ratio setting in face can be ∑ FDirectly:∑FIt is horizontal:∑FIt is interior=1:1.25:3.
(3) it is directed to the design of riser
The molten metal for pouring into casting mold, volume contraction when due to molten metal solidification, often in the thick and solid position of casting
The heart generates the shrinkage cavity of centrality, or generates the shrinkage porosite of dispersibility at other positions that casting radiates different, seriously reduces casting
Mechanical strength and service performance.In order to prevent because of defect caused by solidification shrinkage, some liquid metal can be given in time
Supplement is set to riser.
Riser should be placed in thermo-contact or wall thickness part on shell there may be shrinkage porosite or shrinkage cavity, offer when to solidify
Feeding.At the position that aluminium alloy is last, riser should have sufficient liquid metal to feed to casting.Riser setting is mended in addition to rising
Contracting, the conventional effect for obtaining dense structure's casting is outer, to be also improved the temperature sum aggregate slag of the last fill part aluminium alloy of casting
Effect.
Four, in step S4 about casting technique corresponding process parameters, technological parameter includes the type and thickness, shell of shell
Preheating temperature, the poring rate of the pouring temperature of molten metal and molten metal.
(1) determination of shell type and thickness
Model casting require obtain surface it is smooth, corner angle are clear, size is correct, the second best in quality casting, these all with type
Shell has direct relation.The shell of model casting is divided into multilayer shell and two kinds of solid type, and modern model casting generallys use multilayer
Shell.The technique manufactured applied to shell in production is broadly divided into three kinds, respectively sodium silicate shell, silicasol case and silicic acid
Ethyl ester shell three classes.Silicasol case and silester manufacture craft are usually used in the high casting of required precision, and silica solution is
A kind of silica colloid solution is a kind of high-quality water based adhesive, its simple process shell order is dry compared with silicic acid acetyl
Dry hardening, process is brief, easy to operate, pollution-free to producing.This experiment is comprehensively considered using silicasol case.According to aluminium alloy
The performance requirement of instrument board skeleton casting, setting shell thickness are 6mm.
(2) determination of shell preheating temperature
It needs to carry out the pre-heat treatment to shell before carrying out pouring metal melt.For the shell of aluminum casting, temperature range
To be generally 100 DEG C to 400 DEG C, the height of temperature will depend on the complexity of investment-casting, the more complicated preheating temperature of casting
It is higher.The height of shell preheating temperature directly influences the quality of casting, the too low casting of temperature, molten metal and shell heat exchange
The defects of quickening, casting is easy to produce cold shut shrinkage porosite, stomata.Temperature is excessively high will to lengthen casting cooling time, make the machine of casting
Tool reduced performance.The moisture and volatile matter that preheating is beneficial in removal shell are carried out to shell simultaneously, enhance the intensity of shell
Make shell that there is good gas permeability and intensity with gas permeability.
The structure of the present embodiment combination knowhow and aluminium alloy instrument board skeleton part as a result, takes shell preheating temperature
It is 350 DEG C.
(3) determination of pouring metal melt temperature
Pouring metal melt temperature is most important to the quality of casting.With increasing for pouring temperature, molten metal mobility becomes
It is good, but to will lead to casting shrinking percentage in solidification larger for excessively high temperature, the defects of being easy to produce shrinkage porosite, shrinkage cavity.With casting
The defects of mobility of the reduction molten metal of temperature is deteriorated, and casting is easy to produce cold shut, misrun.
Under normal circumstances, when aluminium alloy part is poured, pouring temperature is higher than 50-150 DEG C of aluminum alloy melt liquidus temperature, for
Small, thin, casting of complicated structure should use higher temperature.The liquidus curve of ZL114A is 648 DEG C, and pouring metal melt temperature should be higher than that
50~100 DEG C of material liquid phase line temperature.The weight of the present embodiment combination instrument board skeleton, wall thickness and design feature determine as a result,
Its pouring temperature is 710 DEG C.
(4) determination of pouring metal melt speed
The speed of time and casting of the metal liquid of casting full of type chamber have a very large relationship, the size of poring rate
Also can casting quality.If poring rate is excessive, it is easy to it is bad existing to generate molten metal splashing, etc. excessive to the impact of type chamber
As.If poring rate is excessively slow, it may occur that casting be also casting complete have place start to solidify, cause generate misrun and
Cold shut phenomenon.Suitable pouring metal melt speed will make molten metal preferably be full of shell, reduce metal oxidation, each portion of casting
Divide the temperature difference obvious, be conducive to casting consecutive solidification, avoids generating defect.
The present embodiment can be modeled about pouring metal melt speed are as follows:Wherein, vIt fillsIt is poured for molten metal
Infuse speed (㎝/s), h is casting height (㎝), δ is casting section thickness (㎝), t1For pouring metal melt temperature (DEG C).
Five, shell is poured using model casting running gate system about in step S5, incorporated by reference to Fig. 1 to Fig. 4.
In conjunction with step S1, step S2, step S3 and step S4, the three-dimensional structure for obtaining instrument board skeleton is designed first,
In include selection to casting metal material.Then the wax-pattern and shell knot of integrated instrument disk skeleton are obtained according to three-dimensional structure
Then structure designs model casting running gate system corresponding with shell, then is determined to the parameter of running channel each in running gate system, together
When determine the corresponding process parameters of casting technique, then carry out casting process.Then heat treatment is carried out to the system of casting, thus
Integrated aluminium alloy instrument board skeleton is obtained, finally integrated aluminium alloy instrument board obtained is cleared up, to its inner surface
Blasting treatment checks its internal soundness by ray detection, can be obtained standard compliant integrated aluminium alloy instrument board skeleton.
The instrument board of monoblock type is made using structure-material integrated design method combination model casting technique by the present invention
Skeleton.The interaction of monolithic construction each section, good integrity, the rigidity of structure is larger, is conducive to play a supporting role.Meanwhile
The instrument board skeleton of integral structure reduces the process of each section connection, saves raw material, is conducive to economize on resources.The present invention
Replace conventional steel material as the raw material of instrument board skeleton using aluminum alloy materials, the density of the material is compared to traditional steel
Density it is smaller, light weight degree can reach 30% or so, to improve the fuel economy of automobile.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.
Claims (10)
1. a kind of integration aluminium alloy instrument board skeleton forming method, which is characterized in that it includes the following steps:
Step S1: the three-dimensional structure of design integration aluminium alloy instrument board skeleton；
Step S2: design mode shell structure and model casting running gate system, for injecting molten metal in the type chamber to shell interior；It is molten
Die cast running gate system includes sprue, cross gate and five ingates；
Step S3: corresponding running channel design is carried out respectively to sprue, cross gate and ingate；The input port of sprue supplies one
Molten metal input；The middle part of cross gate has input port, and vertical with the delivery outlet of sprue and communicate；Five ingates it is defeated
Delivery outlet corresponding with cross gate bottom is vertical respectively and communicates for entrance, and the delivery outlet of five ingates is corresponding on shell respectively
The sprue gate that position opens up communicates, and sprue gate is connected to the intracavitary portion of type；
Step S4: determining the corresponding process parameters of casting technique, and technological parameter includes the type of shell and the preheating of thickness, shell
The poring rate of temperature, the pouring temperature of molten metal and molten metal；
Step S5: shell is poured using model casting running gate system；
Wherein, the poring rate modeling of molten metal are as follows:vIt fillsFor pouring metal melt speed, h is that casting is high
Degree, δ is casting section thickness, t1For pouring metal melt temperature.
2. integration aluminium alloy instrument board skeleton forming method as described in claim 1, which is characterized in that the step S2
Middle molten metal is the zAL114 aluminum alloy materials of molten condition.
3. integration aluminium alloy instrument board skeleton forming method as described in claim 1, which is characterized in that the sprue
Sectional area modeling are as follows:
Wherein, AResistanceFor running gate system minimum sectional area, GLTo flow through AResistanceThe molten metal total weight of sectional area, t2For the duration of pouring, μ
For flow loss coefficient,Height is thrown for average computation pressure.
4. integration aluminium alloy instrument board skeleton forming method as claimed in claim 3, which is characterized in that the sprue,
The area of section ratio of cross gate and ingate is 1:1.25:3.
5. integration aluminium alloy instrument board skeleton forming method as described in claim 1, which is characterized in that the step 3
In further include Feeder Design, riser is placed in the thermo-contact part or the position of wall thickness that shrinkage porosite or shrinkage cavity are generated on shell, with for
Type intracavitary molten metal provides feeding when solidifying.
6. integration aluminium alloy instrument board skeleton forming method as described in claim 1, which is characterized in that the step S4
The type of middle shell is silicasol case.
7. integration aluminium alloy instrument board skeleton forming method as described in claim 1, which is characterized in that the step S4
The preheating temperature range of middle shell is 100 DEG C to 400 DEG C.
8. integration aluminium alloy instrument board skeleton forming method as claimed in claim 7, which is characterized in that the shell it is pre-
Hot temperature is 350 DEG C.
9. integration aluminium alloy instrument board skeleton forming method as described in claim 1, which is characterized in that in the step S4
The pouring temperature of molten metal is 710 DEG C.
10. integration aluminium alloy instrument board skeleton forming method as described in claim 1, which is characterized in that the step
Blasting treatment is carried out to the casting inner surface after moulding by casting in S5.
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