CN108057873A - The process of low pressure casting thin-walled aluminium alloy castings - Google Patents
The process of low pressure casting thin-walled aluminium alloy castings Download PDFInfo
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- CN108057873A CN108057873A CN201810071654.1A CN201810071654A CN108057873A CN 108057873 A CN108057873 A CN 108057873A CN 201810071654 A CN201810071654 A CN 201810071654A CN 108057873 A CN108057873 A CN 108057873A
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- core
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- riser
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The present invention provides a kind of processes of low pressure casting thin-walled aluminium alloy castings, solve the problems, such as that the R＆D cycle that constantly finishing or brand-new are brought of mold caused by constantly being adjusted due to product structure in the research and development of products cycle is long, R＆D costs are high.It is specially：Step S001 establishes the threedimensional model of casting according to product two dimension drawing in three-dimensional software；Step S002, according to technological requirement on the Casting Three-dimensional model arrangement of pouring system and riser, and obtain the core body of the casting on the premise of the minimum mold thickness after difference by being asked with Casting Three-dimensional model, running gate system and riser；Step S003, point core and/or parting are carried out to the core for cast body, it is inner cavity sand core, external form sand mold and riser sand mold three parts by core for cast body cutting, the inner cavity sand core is used for being formed the inner-cavity structure of casting, the external form sand mold is used for being formed the appearance structure of casting, the riser sand mold is used for accommodating riser, and riser is set on external face to do and gate pad.
Description
Technical field
The present invention relates to a kind of Low Pressure Casting Technology, more particularly to a kind of casting technique of aluminium alloy thin-walled casting.
Background technology
Al-alloy casing casting shown in Fig. 1 belongs to typical large size, thin walled aluminum casting, a diameter of Φ 400mm-
1200mm.Such product, outer surface need full processing, and there are more reinforcing rib, navels for inside（It needs to punch）Deng.In moulding
Cheng Zhong, such product are mostly produced using mould process moulding, and along casting maximum cross-section parting, outer profile is taken out of by mold, inner cavity
Structure is formed by sand core, and inner cavity sand core is shaped using wooden core box, because gusset is relatively thin and higher, molding is difficult, it is necessary to will
Gusset mold survives material, causes casting dimension accuracy poor.In addition, in the research and development of products cycle, because of product structure modification or
Person's casting technique is adjusted, it is necessary to frequently change mold, causes that R＆D costs are high, the cycle is long.Meanwhile during group core, generally
Control group core precision, operation difficulty are big by the way of special fixture combination hand dipping.Existing coremaking, formative technology so
The sand core made is various, and group core mode is complicated, and process control requirements are cumbersome, the grade of skill requirement for field worker
It is high.Meanwhile product size is difficult to control, and causes scale error big.
The content of the invention
In view of problem above, it is necessary to a kind of process of low pressure casting thin-walled aluminium alloy castings is proposed, to solve
The R＆D cycle length that constantly finishing or brand-new are brought of mold caused by constantly being adjusted due to product structure in the research and development of products cycle,
The problem of R＆D costs are high, while avoided by using increases material manufacturing technology and according to product structure core and/or parting is divided to cause
Sand core quantity it is more, group core difficulty is big, the problem of precision is low.
A kind of process of low pressure casting thin-walled aluminium alloy castings is specially：
Step S001 establishes the threedimensional model of casting according to product two dimension drawing in three-dimensional software；
Step S002, according to technological requirement on the Casting Three-dimensional model arrangement of pouring system and riser, and in most snack sand
Obtain the core body of the casting on the premise of amount after difference by being asked with Casting Three-dimensional model, running gate system and riser；
Step S003 carries out point core and/or parting to the core for cast body, is inner cavity sand by core for cast body cutting
Core, external form sand mold and riser sand mold three parts, the inner cavity sand core are used for being formed the inner-cavity structure of casting, and the external form sand mold is used
Form the appearance structure of casting, the riser sand mold is used for accommodating riser, and riser is set on external face to do and cast gate
Seat.
As the further restriction of the present invention, it is all provided in the mating surface of inner cavity sand core, external form sand mold and riser sand mold useful
In positioning and fixed snap fastener.
As the further restriction of the present invention, the cast chassis with core body cooperation is by being resistant to 900 DEG C or more high temperature
Metal material be made, concrete structure is middle part with the circle of stalk or direction square position, so as to fulfill the cast
Being used repeatedly for chassis, not only reduces production cost, has been also convenient for the versatility of production.Simultaneously the stalk namely
Sprue, molten metal fill type thence into running gate system progress casting.
The technique effect of the technical program is：Pass through the technique side for implementing low pressure casting thin-walled aluminium alloy castings of the present invention
Method solves the constantly finishing or grinding of bringing of brand-new of mold caused by constantly being adjusted due to product structure in the research and development of products cycle
Send out the problem of cycle is long, R＆D costs are high so that the R＆D cycle shortens more than 80%；It is kept away simultaneously by using increases material manufacturing technology
The problem of sand core quantity caused by dividing core and/or parting according to product structure is more, group core difficulty is big, precision is low are exempted from.The present invention
By setting general cast pedestal, while improving production efficiency, production cost is reduced.By using core integral type
The mode of parting avoids the group core process of nonplanar structure, reduces a group operation difficulty for core process, also improve group type
Precision improves product yield so that the qualification rate of casting reaches more than 95%.
Description of the drawings
Fig. 1 is thin-walled aluminium alloy castings structure chart of the present invention；
Fig. 2 is running gate system of the present invention and riser layout drawing；
Fig. 3 is core assembling schematic diagram of the present invention；
Fig. 4 is the first parting scheme explosion figure of the invention；
Fig. 5 is second of parting scheme explosion figure of the invention.
In figure, 1- sprues；2- cross gates；3- ingates；4- riser；5- pours into a mould chassis；5A- stalks；5B- collets；
6- inner cavities sand core；6A- cross gate types；6B- inner cavities column core；7- external form sand molds；8- riser sand molds；8A- emits lid；8B- riser cores；
The first die joints of 9A-；The second die joints of 9B-；Inner cavity sand cores of the 10- with window；11- half mould external form sand molds.
Specific embodiment
In order to illustrate more clearly of technical scheme, will be described in detail according to attached drawing embodiment, it is aobvious and easy
Insight, the accompanying drawings in the following description are some embodiments of the present invention, for those of ordinary skill in the art, are not being paid
On the premise of creative work, other attached drawings are can also be obtained according to these attached drawings.
The column structure of reinforcing rib is carried for an inner cavity as shown in Figure 1, and window is offered on its outer circle wall.It is described
Column casting uses Low Pressure Casting Technology, the first parting scheme is：
Step S101 establishes the threedimensional model of column casting according to product two dimension drawing in three-dimensional software；
Step S102, according to technological requirement on the column Casting Three-dimensional model arrangement of pouring system and riser, and most
By obtaining the column casting after seeking difference with column Casting Three-dimensional model, running gate system and riser on the premise of small mold thickness
The core body of part；
Step S103 carries out point core and/or parting, the window along on the column casting to the column core for cast body
Top edge is the first die joint 9A perpendicular to the face of casting axial direction, is the second parting along the interface of sprue and cross gate
The cutting of column core for cast body is three parts by face 9B, the first die joint 9A and the second die joint 9B, is respectively inner cavity
Sand core 6, external form sand mold 7 and riser sand mold 8, the inner-cavity structure of the inner cavity sand core 6 including column casting, cross gate 2 and straight
Running channel 1 and 2 switching phase of cross gate, the external form sand mold 7 includes the appearance structure of the column casting and ingate 3, described
Riser sand mold 8 is equipped with the riser 4 being connected with ingate 3.
Preferably, can also be required on the column Casting Three-dimensional model according to technical quality to be processed in product
Processing capacity on face is set, molding allowance is set at crucial thin-walled position.The wall thickness half at the key thin-walled position is 3mm-
12mm。
Preferably, the running gate system uses low pressure casting system, is specially that sprue 1 is located at the column casting type
At the center location of core bottom；If cross gate 2 is evenly distributed with along the radial direction of the column core for cast body bottom
Dry item；If ingate 3 has from the one end of cross gate 2 away from sprue 1 along the column core for cast body axial directional distribution
Dry item, and penetrate into always at the top of the column core for cast body.
Preferably, each ingate 3 is located at the end point of the column core for cast body top surface equipped with corresponding
Riser 4, so as to fulfill the punching press of molten metal, the defects of to ensure that product can enrich, avoid shrinkage cavity, shrinkage depression.
Preferably, the riser sand mold 8 can also be established as riser core 8B and emit lid 8A, core to be facilitated to assemble, make
It obtains riser good to align with ingate 3, so as to the smooth outflow beneficial to molten metal.The riser core 8B is equipped with positioning
Core print, so as to which riser sand mold 8 be facilitated to cooperate with inner cavity sand core 6.
Preferably, when inner cavity sand core 6 influences the arrangement of chill, the inner cavity sand core 6 can be cut as inner cavity column core
6B and cross gate type 6A.
Preferably, the fit clearance of 0.2mm-1.0mm is equipped between the inner cavity sand core 6, external form sand mold 7 and riser sand mold 9,
In core assembling process, sealing strip is set at the fit clearance.
Preferably, the upper reserved chill accommodating chamber of placement chill is needed on the column core for cast body, and it is described
Chill accommodating chamber leaves the fit clearance of 0.3mm-0.5mm with chill part.
Preferably, the primary and secondary buckle structure for coordinating and positioning is equipped on the cross gate type 6A of the inner cavity sand core 6.
The group type of the column casting is with casting process：
1）The inner cavity sand core is placed on cast chassis；
2）External form sand mold is passed through in snap fastener location structure group type to the inner cavity sand core；
3）Riser sand mold is fastened on external form sand mold and inner cavity sand core top, completes the group type of entire column core for cast body；
4）The fit clearance between the inner cavity sand core, riser sand mold and external form sand mold is sealed with sealing strip；
5）Column core for cast body after the sealing is placed in together with cast chassis in corresponding sandbox, flows resin sand
After resin sand hardening, it is to be cast to be moved to cast region by floor sand for entire babinet.
Preferably, the molten metal injects the column casting under the low pressure of 0.3MPa-0.7MPa by stalk
In the running gate system of core body, and pressurize 15min-30min, so as to complete the cast of the column casting.
The column structure of reinforcing rib is carried for an inner cavity as shown in Figure 1, and window is offered on its outer circle wall.It is described
Column casting uses Low Pressure Casting Technology, and second of parting scheme is：
Step S201 establishes the threedimensional model of column casting according to product two dimension drawing in three-dimensional software；
Step S202, according to technological requirement on the column Casting Three-dimensional model arrangement of pouring system and riser, and most
By obtaining the column casting after seeking difference with column Casting Three-dimensional model, running gate system and riser on the premise of small mold thickness
The core body of part；
Step S203 carries out point core and/or parting to the column core for cast body, and the inner cavity of the column casting is whole
Body goes out core and forms the inner cavity sand core 10 with window in the cross gate type where cross gate structure, symmetrical along column casting window
Axis by the sand mold cutting of column casting appearance structure be two symmetrical half mould external forms 11, described two symmetrical half moulves
External form 11 can effectively wrap up the structure of window portion, and the lid 8A that emits directly is fastened on the inner cavity sand core with window
On 10.
Second of parting scheme can be integrally formed ingate 3 and riser 4, so as to avoid because of two
Molten metal turbulent flow, causes surface quality of continuous castings to be deteriorated caused by misalignment.
The group type process of the second scheme is：
1）Cast chassis 5 is placed on group type platform, the inner cavity sand core 10 with window is located by positioning snap fastener structure
On the cast chassis 5；
2）Half mould external form 11 is fastened to by positioning snap fastener on the inner cavity sand core 10 with window；
3）Lid 8A will be emitted to be fastened on the inner cavity sand core 10 with window by positioning snap fastener, complete entire column casting
The group type of core body.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
Either which part or all technical characteristic are equal with modifying to the technical solution recorded in previous embodiment
It replaces；And these modifications or replacement, the essence of appropriate technical solution is not made to depart from the model of technical solution of the embodiment of the present invention
It encloses.
Claims (10)
1. a kind of process of low pressure casting thin-walled aluminium alloy castings, which is characterized in that comprise the following steps that：
S001 establishes the threedimensional model of casting according to product two dimension drawing in three-dimensional software；
S002, according to technological requirement on the Casting Three-dimensional model arrangement of pouring system and riser, and in minimum mold thickness
Under the premise of the core body of the casting is obtained after difference by being asked with Casting Three-dimensional model, running gate system and riser；
S003 carries out point core and/or parting to the core for cast body, is inner cavity sand core by core for cast body cutting, outer
Molding sand type and riser sand mold three parts, the inner cavity sand core are used for being formed the inner-cavity structure of casting, and the external form sand mold is used for shape
Into the appearance structure of casting, the riser sand mold is used for accommodating riser, and riser is set on external face to do and gate pad.
2. the process of low pressure casting thin-walled aluminium alloy castings as described in claim 1, which is characterized in that the inner cavity sand
It is equipped in the mating surface of core, external form sand mold and riser sand mold for positioning and fixed snap fastener.
3. the process of low pressure casting thin-walled aluminium alloy castings as described in claim 1, which is characterized in that the cast bottom
Disk is made of the metal material for being resistant to 900 DEG C or more high temperature, and it is circular or square flat with stalk that concrete structure is middle part
Disk.
4. the process of low pressure casting thin-walled aluminium alloy castings as described in claim 1, which is characterized in that the first parting side
Case is specially：
S101 establishes the threedimensional model of column casting according to product two dimension drawing in three-dimensional software；
S102, according to technological requirement on the column Casting Three-dimensional model arrangement of pouring system and riser, and in most snack
By obtaining the column casting after seeking difference with column Casting Three-dimensional model, running gate system and riser on the premise of sand amount
Core body；
S103 carries out point core and/or parting, the window top along on the column casting to the column core for cast body
Edge is the first die joint perpendicular to the face of casting axial direction（9A）, it is the second die joint along the interface of sprue and cross gate
（9B）, first die joint（9A）With the second die joint（9B）It is three parts by the cutting of column core for cast body, is respectively
Inner cavity sand core（6）, external form sand mold（7）With riser sand mold（8）, the inner cavity sand core（6）Inner-cavity structure including column casting,
Cross gate（2）And sprue（1）With cross gate（2）Switching phase, the external form sand mold（7）Include the external form of the column casting
Structure and ingate（3）, the riser sand mold（8）It is equipped with and ingate（3）Connected riser（4）.
5. the process of low pressure casting thin-walled aluminium alloy castings as claimed in claim 4, which is characterized in that in the column
The face to be processed of body casting is equipped with processing capacity, and molding allowance is equipped at the crucial thin-walled position of the column casting.
6. the process of low pressure casting thin-walled aluminium alloy castings as claimed in claim 4, which is characterized in that the cast system
System is specially sprue using low pressure casting system（1）At the center location of the column core for cast body bottom；It is horizontal
Running channel（2）Several are evenly distributed with along the radial direction of the column core for cast body bottom；Ingate（3）From cross gate
（2）Away from sprue（1）One end have several along the column core for cast body axial directional distribution, and penetrate into always
At the top of the column core for cast body, the ingate at the top of the column core for cast body（3）Correspondence is additionally provided in outlet
Riser（4）.
7. the process of low pressure casting thin-walled aluminium alloy castings as claimed in claim 4, which is characterized in that the riser sand
Type（8）It can also be established as riser core（8B）With emit lid（8A）, the inner cavity sand core（6）It cuts as inner cavity column core（6B）And horizontal stroke
Pour channel type（6A）.
8. the process of low pressure casting thin-walled aluminium alloy castings as claimed in claim 4, which is characterized in that the column
Group type and the casting process of casting be：
The first step, by the inner cavity sand core（6）It is placed in cast chassis（5）On；
External form sand mold is passed through snap fastener location structure group type to the inner cavity sand core by second step（6）On；
3rd step, by riser sand mold（8）It is fastened on external form sand mold（7）With inner cavity sand core（6）Entire column casting is completed on top
The group type of core body；
4th step, with sealing strip by the inner cavity sand core（6）, riser sand mold（8）With external form sand mold（7）Between fit clearance it is close
Envelope；
Column core for cast body after the sealing is placed in together with cast chassis in corresponding sandbox, flows by the 5th step
After resin sand hardening, it is to be cast to be moved to cast region by resin sand floor sand for entire babinet.
9. the process of low pressure casting thin-walled aluminium alloy castings as claimed in claim 8, which is characterized in that molten metal exists
Pass through stalk under the low pressure of 0.3MPa-0.7MPa（5A）It injects in the running gate system of the column core for cast body, and protects
15min-30min is pressed, so as to complete the cast of the column casting.
10. the process of low pressure casting thin-walled aluminium alloy castings as described in claim 1, which is characterized in that the second parting
Scheme is specially：
S201 establishes the threedimensional model of column casting according to product two dimension drawing in three-dimensional software；
S202, according to technological requirement on the column Casting Three-dimensional model arrangement of pouring system and riser, and in most snack
By obtaining the column casting after seeking difference with column Casting Three-dimensional model, running gate system and riser on the premise of sand amount
Core body；
S203 carries out point core and/or parting to the column core for cast body, the inner cavity of the column casting is integrally gone out
Core simultaneously forms the inner cavity sand core with window in the cross gate type where cross gate structure（10）, it is symmetrical along column casting window
The sand mold cutting of column casting appearance structure is two symmetrical half mould external forms by axis（11）, described two symmetrical half moulves
External form（11）The structure of window portion can be effectively wrapped up, it is described to emit lid（8A）Directly it is fastened on the inner cavity with window
Sand core（10）On.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810071654.1A CN108057873B (en) | 2018-01-26 | 2018-01-26 | Process method for casting thin-wall aluminum alloy casting at low pressure |
| CN202010623881.8A CN111659876B (en) | 2018-01-26 | 2018-01-26 | Process method for casting thin-wall aluminum alloy casting at low pressure |
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| CN201810071654.1A CN108057873B (en) | 2018-01-26 | 2018-01-26 | Process method for casting thin-wall aluminum alloy casting at low pressure |
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| CN108057873B CN108057873B (en) | 2021-04-23 |
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| CN201810071654.1A Active CN108057873B (en) | 2018-01-26 | 2018-01-26 | Process method for casting thin-wall aluminum alloy casting at low pressure |
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| CN108480560A (en) * | 2018-06-20 | 2018-09-04 | 株洲中航动力精密铸造有限公司 | Cast shape method of adjustment and Wax mold group for adjusting cast shape |
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| CN110695338A (en) * | 2018-07-10 | 2020-01-17 | 上海中振有色金属铸造有限公司 | Process method for casting thin-wall casting at low pressure |
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| CN111659876B (en) | 2022-04-19 |
| CN111659876A (en) | 2020-09-15 |
| CN108057873B (en) | 2021-04-23 |
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