CN102699312B - Low-pressure casting process and mould for aluminium alloy steering knuckle - Google Patents
Low-pressure casting process and mould for aluminium alloy steering knuckle Download PDFInfo
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- CN102699312B CN102699312B CN201210239609.5A CN201210239609A CN102699312B CN 102699312 B CN102699312 B CN 102699312B CN 201210239609 A CN201210239609 A CN 201210239609A CN 102699312 B CN102699312 B CN 102699312B
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Abstract
The invention relates to a low-pressure casting process and a mould for an aluminium alloy steering knuckle. The low-pressure casting process comprises the following process steps of: A, selection and preparation for a material (A356 is used, 0.04-0.05wt% of Sr is added according to the total of alloy solution to deteriorate an aluminium solution, so as to refine crystalline grains during the crystallization of the aluminium solution); and B, casting for a product, wherein a low-pressure casting mould is used for casting, and the casting comprises: putting in a filter screen, assembling the mould, lifting the solution, filling the mould, maintaining a pressure, opening water-cooling, relieving the pressure, closing the water-cooling, opening an upper mould, ejecting, and taking out the product. The low-pressure casting process and the mould are mainly used for solving the problems of large equipment tonnage, complex procedures during a manufacturing process, high material cost and the like existing in the existing forging method for an aluminium alloy steering knuckle, and are capable of producing casting products which meet requirements without a need of expensive investment; and moreover, the castings are high in structure compactness, good in casting quality, and high in production efficiency. Simultaneously, the metal solution is high in utilization rate and less in the consumption of auxiliary materials.
Description
Technical field
The present invention relates to low-pressure casting process and prepare part technical field, particularly a kind of low-pressure casting process of aluminium alloy knuckle and mould.
Background technology
Spindle is the parts that connect vehicle steering and front-wheel wheel shaft, and is connected with damper.It mainly contains three partial functions: 1 is connected with front axle, bears the force and moment that axle transmits, the rotatable parts of 2 motor turnings, and 3 absorb the concussion in automobile traveling process.It is the most concentrated, the most complicated part of stress in automobile; Under motoring condition, it is bearing changeable shock loading, therefore, requires it to have very high intensity.Traditional aluminium alloy knuckle is main mainly with forging at present, and aluminum alloy forged have equipment tonnage large, complex procedures in manufacture process, the problems such as material cost height.
Summary of the invention
The object of the present invention is to provide a kind of low-pressure casting process and mould of aluminium alloy knuckle, it mainly solves existing aluminium alloy steering knuckle forging method and exists equipment tonnage large, complex procedures in manufacture process, the problems such as material cost height, it does not need expensive investment, can produce satisfactory cast product, and dense structure's degree of foundry goods is high, casting quality is good, and production efficiency is high.The utilization rate of molten metal is high simultaneously, and auxiliary material consumption is few.
The present invention solves the problems of the technologies described above adopted technical scheme.
A low-pressure casting process for aluminium alloy knuckle, is characterized in that: it comprises following processing step:
The selecting and prepare of A material:
Aluminum alloy materials adopts A356, A356 alloy pig is put into melting furnace to be melted, the rear alloy liquid of fusing goes bad, refining treatment, refining temperature is 730～740 DEG C, and to add mass percent by aluminium alloy total amount be that the Sr of 0.04～0.05 ﹪ goes bad to aluminium liquid, the grain refinement while making the crystallization of aluminium liquid; Adopt rotary degassing machine to pass into argon gas 10～15min simultaneously and carry out the degasification of aluminium liquid, after degasification completes, aluminium liquid is left standstill to 10～15min; Reduce the air content in aluminium liquid, finally the aluminium alloy of handling well is injected in the holding furnace of air injection machine stand-by;
The casting of B product:
Adopt low pressure casting die to cast; Comprise: lower screen pack, matched moulds, rise liquid, fill type, pressurize, open water-cooled, release, pass water-cooled, open patrix, eject, pickup step;
Before cast, first muff and mould are carried out to preheating, controlling mold preheating temperature is 340 ± 20 DEG C; Making the temperature of aluminum liquid in holding furnace is 705 ± 10 DEG C; After matched moulds, pour into a mould; Filling type technological parameter is respectively: rising hydraulic coupling 0.0155MPa, rising the liquid time is that 12 seconds, mold filling pressure are that 0.022MPa, filling time are that 10 seconds, dwell pressure are 0.05～0.06MPa, dwell time to be that 130 ± 20 seconds, cool time are 50 ± 20 seconds, carry out die sinking, when foundry goods moves on to after the height of setting on patrix, eject foundry goods.
The low-pressure casting process of described aluminium alloy knuckle, is characterized in that: described Sr is to add as the form of 10 ﹪ aluminium strontium intermediate alloys containing Sr amount.
The mould adopting in the low-pressure casting process of aluminium alloy knuckle as above, is characterized in that: it is made up of two parts of upper die and lower die; Wherein:
Patrix comprises upper module, cope match-plate pattern, spreader, ejecting mechanism and resetting-mechanism; Described upper module and cope match-plate pattern fix, and spreader is fixed on corresponding cast gate position, upper module center; At patrix, push rod is set, push rod is fixed on top board and by top board guide post and is fixed on patrix, composition ejecting mechanism; Described resetting-mechanism is release link;
Counterdie comprises lower module, lower bolster, sprue bush and muff; Described lower module is connected with lower bolster; Cast gate is arranged on lower module center; Sprue bush is inserting of making of cast gate position, is connected, is connected with low press stalk down, formation aluminium liquid passage on muff with sprue bush; Described cast gate position is provided with heating tube;
Between described upper die and lower die, be also provided with matched moulds detent mechanism.
Described mould, is characterized in that: 3 tunnel water-cooleds are set on described mould, and their position is separately positioned on spreader, upper die and lower die place; Circulating cooling water route is set one on upper module, one circulating cooling water route of counterdie setting.
Described mould, is characterized in that: the water-cooled opening time of described spreader is that pressurize is opened for 130 seconds afterwards, after cooling 40S, closes; Patrix one tunnel water-cooled is opened simultaneously after pressurize 50S, after cooling 80S, closes; Counterdie one tunnel water-cooled is opened after pressurize 100S, after cooling 50S, closes.
Described mould, is characterized in that: described mould adopts ACHESON DAG395 spray painting, and the THICKNESS CONTROL of coating is in 0.3mm left and right; Ingate position, adopts the brushing of the 36# of Fushi section coating, and its thickness is guaranteed, in 1mm left and right, to guarantee the heat insulation effect of the aluminium liquid at cast gate position.
Compared with prior art, the invention has the beneficial effects as follows: the present invention, by improving Birmasil composition of raw material, controls the process of melting, refining and cast, improves the mechanical performance of Casting Aluminum Alloy Based.
Brief description of the drawings
Fig. 1 is the general assembly drawing of casting mould counterdie in the present invention.
Fig. 2 is the profile of casting mould counterdie in the present invention.
Fig. 3 is the general assembly drawing of casting mould patrix in the present invention.
Fig. 4 is the top view of casting mould patrix in the present invention.
Detailed description of the invention
The invention discloses a kind of low-pressure casting process of aluminium alloy knuckle, it comprises following processing step:
The selecting and prepare of A material:
Aluminum alloy materials adopts A356, A356 alloy pig is put into melting furnace to be melted, the rear alloy liquid of fusing goes bad, refining treatment, refining temperature is 730～740 DEG C, and to add mass percent by aluminium alloy total amount be that the Sr of 0.04～0.05 ﹪ goes bad to aluminium liquid, the grain refinement while making the crystallization of aluminium liquid; Adopt rotary degassing machine to pass into argon gas 10～15min simultaneously and carry out the degasification of aluminium liquid, after degasification completes, aluminium liquid is left standstill to 10～15min; Reduce the air content in aluminium liquid, finally the aluminium alloy of handling well is injected in the holding furnace of air injection machine stand-by.
The casting of B product:
Adopt low pressure casting die to cast; Comprise: lower screen pack (as: manual lower screen pack), matched moulds, rise liquid, fill type, pressurize, open water-cooled, release, pass water-cooled, open patrix, eject, pickup step;
Before cast, first muff and mould are carried out to preheating, controlling mold preheating temperature is 340 ± 20 DEG C (mold temperatures too high or the too low internal soundness that is all unfavorable for this product); Making the temperature of aluminum liquid in holding furnace is 705 ± 10 DEG C; After matched moulds, pour into a mould; Filling type technological parameter is respectively: rising hydraulic coupling 0.0155MPa, rising the liquid time is that 12 seconds, mold filling pressure are that 0.022MPa, filling time are that 10 seconds, dwell pressure are 0.05～0.06MPa, dwell time to be that 130 ± 20 seconds, cool time are 50 ± 20 seconds, carry out die sinking, when foundry goods moves on to after the height of setting on patrix, eject foundry goods.
As a kind of optimal way, described Sr is to add as the form of 10 ﹪ aluminium strontium intermediate alloys containing Sr amount.
As Figure 1-4, it is the mould adopting in the low-pressure casting process of aluminium alloy knuckle of the present invention, it is characterized in that: it is made up of two parts of upper die and lower die; Wherein:
Patrix comprises upper module 9, cope match-plate pattern 14, spreader 10, ejecting mechanism and resetting-mechanism; Described upper module 9 and cope match-plate pattern 14 fix, and spreader 10 is fixed on corresponding cast gate position, upper module 9 centers; At patrix, push rod 18 is set, push rod 18 is fixed on top board 15 and by top board guide post 12 and is fixed on patrix, composition ejecting mechanism; Described resetting-mechanism is release link 11, and release link is distributed on four angles of mould, is fixed on the top board of ejecting mechanism, when matched moulds, by release link, top board is resetted.
Counterdie comprises lower module 2, lower bolster 1, sprue bush 7 and muff 8; Described lower module 2 is connected with lower bolster 1; Cast gate 5 is arranged on lower module 1 center; Sprue bush 7 is inserting that make at cast gate position, and is connected, lower is connected with low press stalk, formation aluminium liquid passage on muff 8 with sprue bush 7; Described cast gate 5 positions are provided with heating tube 6(can arrange two), it can make the mold temperature at cast gate position higher than other position.
Between described upper die and lower die, be also provided with matched moulds detent mechanism (comprising the mould pin 13 in matched moulds guide 6 and the Fig. 3 in Fig. 1).
3 tunnel water-cooleds are set on the mould in the present invention, and their position is separately positioned on spreader (as the spreader water route in Fig. 4), patrix (as the patrix water route 17 in Fig. 4) and counterdie (as the counterdie water route 3 in Fig. 1) and locates; Circulating cooling water route is set one on upper module, one circulating cooling water route of counterdie setting.In use procedure, the water-cooled opening time of described spreader is that pressurize is opened for 130 seconds afterwards, after cooling 40S, closes; Patrix one tunnel water-cooled is opened simultaneously after pressurize 50S, after cooling 80S, closes; Counterdie one tunnel water-cooled is opened after pressurize 100S, after cooling 50S, closes.The object that said structure water-cooling channel is set is the temperature that regulates and controls mould by the time of control water-cooled, guarantees that foundry goods forms by the temperature field that forms order away from cast gate position to cast gate position.
Mould in the present invention can adopt ACHESON DAG395 spray painting, and the THICKNESS CONTROL of coating is in 0.3mm left and right; Ingate position, adopts the brushing of the 36# of Fushi section coating, and its thickness is guaranteed, in 1mm left and right, to guarantee the heat insulation effect of the aluminium liquid at cast gate position.
In sum, be only preferred embodiment of the present invention, be not used for limiting practical range of the present invention, i.e. all equivalences of doing according to the content of the present patent application the scope of the claims change and modify, and all should be technology category of the present invention.
Claims (5)
1. a low-pressure casting process for aluminium alloy knuckle, is characterized in that: it comprises following processing step:
The selecting and prepare of A material:
Aluminum alloy materials adopts A356, A356 alloy pig is put into melting furnace to be melted, the rear alloy liquid of fusing goes bad, refining treatment, refining temperature is 730～740 DEG C, and to add mass percent by aluminium alloy total amount be that the Sr of 0.04～0.05 ﹪ goes bad to aluminium liquid, the grain refinement while making the crystallization of aluminium liquid; Adopt rotary degassing machine to pass into argon gas 10～15min simultaneously and carry out the degasification of aluminium liquid, after degasification completes, aluminium liquid is left standstill to 10～15min; Reduce the air content in aluminium liquid, finally the aluminium alloy of handling well is injected in the holding furnace of air injection machine stand-by;
The casting of B product:
Adopt low pressure casting die to cast; Comprise: lower screen pack, matched moulds, rise liquid, fill type, pressurize, open water-cooled, release, pass water-cooled, open patrix, eject, pickup step;
Before cast, first muff and mould are carried out to preheating, controlling mold preheating temperature is 340 ± 20 DEG C; Making the temperature of aluminum liquid in holding furnace is 705 ± 10 DEG C; After matched moulds, pour into a mould; Filling type technological parameter is respectively: rising hydraulic coupling 0.0155MPa, rising the liquid time is that 12 seconds, mold filling pressure are that 0.022MPa, filling time are that 10 seconds, dwell pressure are 0.05～0.06MPa, dwell time to be that 130 ± 20 seconds, cool time are 50 ± 20 seconds, carry out die sinking, when foundry goods moves on to after the height of setting on patrix, eject foundry goods.
2. the low-pressure casting process of aluminium alloy knuckle according to claim 1, is characterized in that: described Sr is to add as the form of 10 ﹪ aluminium strontium intermediate alloys containing Sr amount.
3. the low-pressure casting process of aluminium alloy knuckle according to claim 1 and 2, is characterized in that: the low pressure casting die in this technique is made up of two parts of upper die and lower die; Wherein:
Patrix comprises upper module (9), cope match-plate pattern (14), spreader (10), ejecting mechanism and resetting-mechanism; Described upper module (9) and cope match-plate pattern (14) fix, and spreader (10) is fixed on corresponding cast gate position, upper module (9) center; At patrix, push rod (18) is set, push rod (18) is fixed on top board (15) and goes up and pass through top board guide post (12) and be fixed on patrix, composition ejecting mechanism; Described resetting-mechanism is release link (11);
Counterdie comprises lower module (2), lower bolster (1), sprue bush (7) and muff (8); Described lower module (2) is connected with lower bolster (1); Cast gate (5) is arranged on lower module (1) center; Sprue bush (7) is inserting that make at cast gate position, and muff (8) goes up and sprue bush (7) is connected, descend and low press stalk is connected, and forms aluminium liquid passage; Described cast gate (5) position is provided with heating tube (6);
Between described upper die and lower die, be also provided with matched moulds detent mechanism.
4. the low-pressure casting process of aluminium alloy knuckle according to claim 3, is characterized in that: 3 tunnel water-cooleds are set on described mould, and their position is separately positioned on spreader, upper die and lower die place; Circulating cooling water route is set one on upper module, one circulating cooling water route of counterdie setting.
5. the low-pressure casting process of aluminium alloy knuckle according to claim 4, is characterized in that: the water-cooled opening time of described spreader is that pressurize is opened for 130 seconds afterwards, after cooling 40S, closes; Patrix one tunnel water-cooled is opened simultaneously after pressurize 50S, after cooling 80S, closes; Counterdie one tunnel water-cooled is opened after pressurize 100S, after cooling 50S, closes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210239609.5A CN102699312B (en) | 2012-07-12 | 2012-07-12 | Low-pressure casting process and mould for aluminium alloy steering knuckle |
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| CN201210239609.5A CN102699312B (en) | 2012-07-12 | 2012-07-12 | Low-pressure casting process and mould for aluminium alloy steering knuckle |
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| CN102699312A CN102699312A (en) | 2012-10-03 |
| CN102699312B true CN102699312B (en) | 2014-08-20 |
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