CN107552754A - A kind of method of semi-solid rheological shaping production magnesium alloy auto support parts - Google Patents
A kind of method of semi-solid rheological shaping production magnesium alloy auto support parts Download PDFInfo
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Abstract
A kind of method of semi-solid rheological shaping production magnesium alloy auto support parts, it is related to a kind of auto parts forming production process, to solve during automotive light weight technology because the automobile support class part of prior art manufacture is usually present cold shut, layering, depression and crack defect in structure, and stomata, shrinkage cavity and porosity and pin hole are internally usually present, the problem of so as to have impact on properties of product.The present invention comprises the following steps：Step 1: magnesium alloy smelting：Magnesium alloy materials are first preheated, simultaneously heating crucible is cleared up, melts magnesium alloy materials, be passed through protective gas, refine, remove the gred, stand and be cooled to pouring temperature；Step 2: mould preheats：Installation, debugging, preheated mold, spray releasing agent, continue to heat；Step 3: Semi-solid Stirring：Semi-solid material is stirred, is passed through protective gas；Step 4: squeeze cast form：Extrusion casting machine drift steadily promotes semi solid slurry towards mold cavity, completes cooling processing after the extrusion casint of part.The present invention is used for auto parts and processed.
Description
Technical field
The present invention relates to a kind of auto parts forming production process, and in particular to a kind of semi-solid rheological shaping production magnesium closes
The method of golden automobile support class part.
Background technology
For energy-saving and emission-reduction, automobile just develops towards lightweight direction.From the angle of structural material, realize that vehicle is light
The Main Means of quantization are to use to replace traditional material with the high light material than performance.Magnesium alloy is so far in engineer applied
In one of most light structural timber, plastics, aluminium alloy and steel components can be replaced, its density is mostly in 1.75g/cm3~
1.85g/cm3Between, about the 1/4 of iron, the 2/3 of aluminium, it is close with plastics, have specific strength and specific stiffness are high, heat conductivity is good,
Vibration damping and noise reducing is good, liquid forming superior performance, machining property is excellent, accessory size is stable, electromagnetic shielding capability
The advantages that strong.In recent years, application of the magnesium alloy on vehicle structure part is grown at top speed with annual 18% speed.It is but right
In current commercial cast magnesium alloy, if also difficult using traditional gravity or the production technology of compression casting, its mechanical property
Stably to reach the level of similar alloy product.
Automobile support class part is most at present to be produced using aluminium-alloy pressure-casting method, and minority is cast using aluminium alloy sand mold
Make, the production of gravitational casting and low pressure casting, the automobile support class part manufactured using these traditional handicrafts is in appearance
The defects of existing cold shut, layering, depression and crackle, and the problems such as stomata, shrinkage cavity and porosity and pin hole internally often occurs, from
And it have impact on the performance of product.
In summary, during automotive light weight technology because prior art manufacture automobile support class part in structure usually
Cold shut, layering, depression and crack defect be present, and be internally usually present stomata, shrinkage cavity and porosity and pin hole, so as to have impact on
The problem of properties of product.
The content of the invention
The invention aims to solve during automotive light weight technology because of the automobile support class zero of prior art manufacture
Part is usually present cold shut, layering, depression and crack defect in structure, and is internally usually present stomata, shrinkage cavity and porosity and pin
Hole, the problem of so as to have impact on properties of product, and then provide a kind of semi-solid rheological shaping production magnesium alloy auto support class
The method of part.
The technical scheme is that：
A kind of method of semi-solid rheological shaping production magnesium alloy auto support parts, it comprises the following steps：
Step 1: magnesium alloy smelting：
Magnesium alloy materials are first preheated, the preheating temperature of magnesium alloy materials is 200 DEG C~250 DEG C, clears up crucible and in crucible
Inner surface, which applies, to be coated, and then crucible is heated, and when crucible heating-up temperature is 400 DEG C~500 DEG C, adds magnesium alloy material
Material is melted, and being passed through protective gas prevents magnesium alloy from burning, and finally after magnesium alloy is completely melt, is carried out at inoculating and refining
Reason, inoculating and refining temperature are 720 DEG C~750 DEG C, remove the scum silica frost on liquid level, aluminium alloy stands and is cooled to pouring temperature；
Step 2: mould preheats：
First by magnesium alloy auto support parts mould installion on extrusion casting machine, pre- hot-die after being debugged to mould
Tool, the preheating temperature of mould is 150 DEG C~200 DEG C, and releasing agent is sprayed in mold cavity, then proceedes to heat mould, mould
Heating-up temperature be 200 DEG C~250 DEG C；
Step 3: Semi-solid Stirring：
It is first 580 DEG C~630 DEG C using mechanical system stirring semi-solid material, whipping temp in scoop, stirring intensity
For 2r/s~6r/s, mixing time is 3min~6min, and in material and whipping process is scooped, protective gas is passed through in scoop
Prevent the burning of magnesium alloy semisolid slurry；
Step 4: squeeze cast form：
First magnesium alloy semisolid slurry is poured in feeding cylinder, pouring temperature is 580 DEG C~630 DEG C, then by extrusion casint
Machine drift steadily promotes semi solid slurry towards mold cavity, adjusts extrusion casint parameter：Squeeze pressure be 90MPa~
130MPa, dwell time are 20s~40s, and drift extrusion speed is 0.08m/s~0.2m/s, so far, complete magnesium alloy auto branch
The extrusion casint process of frame class part, finally taking-up spray, which is put into water, cools.
Further, the preheating temperature of magnesium alloy materials is 225 DEG C in step 1, and crucible heating-up temperature is 425 DEG C, is gone bad
Refining temperature is 735 DEG C.
Further, the protective gas in step 1 is SF6+CO2Mixed gas.
Further, the protective gas in step 1 includes 0.3%vol SF6, 50%vol CO2With 49.7%vol's
Air.
Further, the preheating temperature of mould is 175 DEG C in step 2, and the heating-up temperature of mould is 225 DEG C.
Further, the whipping temp in step 3 is 605 DEG C, and whipping temp is 605 DEG C, stirring intensity 4r/s, is stirred
It is 4.5min to mix the time.
Further, the protective gas in step 3 is SF6+CO2Mixed gas.
Further, the protective gas in step 3 includes 0.3%vol SF6, 50%vol CO2With 49.7%vol's
Air.
Further, the pouring temperature in step 4 is 605 DEG C, and regulation extrusion casint parameter is 110MPa, the dwell time
For 30s, drift extrusion speed is 0.14m/s.
The present invention has the following effects that compared with prior art：
1st, the present invention is stirred vigorously or handled, the dendrite formed in process of setting is beaten in metal solidification process
Broken or complete inhibition dendrite growth, strengthen alloy strength, toughness improves corrosion stability, and extrusion casint makes liquid or semisolid gold
Category solidifies under high pressure, flowing forming, because High Pressure Solidification and plastic deformation are present simultaneously, fills type feeding energy with stronger
Power, the formation for the defects of greatly reducing product stomata, shrinkage cavity and porosity, dense structure, mechanical property are cast higher than aluminium alloy pressure
Make, casting method and technique, the mechanical agitation such as aluminium alloy sand mould casting, gravitational casting and low pressure casting are sufficient for stirring effect
Fruit, cost is low, and technique is simple.
2nd, Semi-Solid Metal Process shapes technology different from traditional, and it is in metal solidification process, is entered
Row is stirred vigorously or handled, and the dendrite formed in process of setting is smashed or completely inhibited the growth of dendrite, then directly carries out
Rheocasting prepares thixotroping shaping again after the billet with non-dendritic structure.Using its tissue of the product of semisolid method preparation
Structure is uniform, tiny, torulose particle, therefore the properties of material are excellent.
3rd, extrusion casint be make liquid or semi-solid-state metal solidify under high pressure, flowing forming, directly obtain product or hair
The method of base.Because High Pressure Solidification and plastic deformation are present simultaneously, type feeding capacity is filled with stronger, greatly reduces product
The formation of the defects of stomata, shrinkage cavity and porosity, dense structure, mechanical property are higher than other casting methods and technique.
4th, molten metal solidifies under mechanical stress during extrusion casint, have improve cooling velocity, improve setting rate,
Crystal grain thinning, improve tissue uniformity etc. effect, while to reduce or eliminate bleb, shrinkage cavity and it is loose etc. in
Portion's defect equally has the function that positive.Extrusion casint pressure makes the frozen metal near mold wall that a certain degree of plasticity occur
Deformation so that dense structure's property further improves.Therefore, extrusion casint casting has higher mechanical performance, in certain journey
It is higher than other traditional mo(u)lded pieces on degree, or even can be compared favourably with the mechanical property of the forging casting of identical material.Therefore, squeeze
Die casting, which is made, is widely used in automobile and aircraft industry.
5th, during extrusion casint, the liquid metal in die cavity is the coagulation forming under larger action of mechanical pressure, and pressure makes
Obtain liquid metal and the crust layer solidified is in close contact with mold wall all the time, improve interface heat exchange coefficient and the cooling of casting
Speed.Therefore, the surface smoothness of extrusion casint casting and surface size precision are higher, and it is superior to the level of die casting.
6th, extrusion casint tool is by good versatility.Extrusion casint carries out filling type feeding under stress, has higher fill
Type motive force.Alloy casting character will not have an impact to extrusion casint performance substantially.Therefore, the scope of application of extrusion casint is non-
Often extensively, while suitable for good casting property and the bad alloy of casting character, it is equally applicable for metal semi-solid.
Brief description of the drawings
Fig. 1 is the microscopic structure structure figure of magnesium alloy auto differential mechanism stent blank in the embodiment of the present invention one；
Fig. 2 is the Line Chart of influence of the pouring temperature to magnesium alloy differential mechanism support tensile strength；
The Line Chart of influence of Fig. 3 pouring temperatures to magnesium alloy differential mechanism support elongation percentage；
Fig. 4 be the duration of pouring be 595 DEG C when, the microscopic structure structure figure of magnesium alloy differential mechanism support；
Fig. 5 be the duration of pouring be 605 DEG C when, the microscopic structure structure figure of magnesium alloy differential mechanism support；
Fig. 6 be the duration of pouring be 615 DEG C when, the microscopic structure structure figure of magnesium alloy differential mechanism support；
Fig. 7 be the duration of pouring be 625 DEG C when, the microscopic structure structure figure of magnesium alloy differential mechanism support.
Embodiment
Embodiment one：Illustrate present embodiment, a kind of semi-solid rheological shaping life of present embodiment with reference to Fig. 1
The method for producing magnesium alloy auto support parts, it comprises the following steps：
Step 1: magnesium alloy smelting：
Magnesium alloy materials are first preheated, the preheating temperature of magnesium alloy materials is 200 DEG C~250 DEG C, clears up crucible and in crucible
Inner surface, which applies, to be coated, and then crucible is heated, and when crucible heating-up temperature is 400 DEG C~500 DEG C, adds magnesium alloy material
Material is melted, and being passed through protective gas prevents magnesium alloy from burning, and finally after magnesium alloy is completely melt, is carried out at inoculating and refining
Reason, inoculating and refining temperature are 720 DEG C~750 DEG C, remove the scum silica frost on liquid level, aluminium alloy stands and is cooled to pouring temperature；
Step 2: mould preheats：
First by magnesium alloy auto support parts mould installion on extrusion casting machine, pre- hot-die after being debugged to mould
Tool, the preheating temperature of mould is 150 DEG C~200 DEG C, and releasing agent is sprayed in mold cavity, then proceedes to heat mould, mould
Heating-up temperature be 200 DEG C~250 DEG C；
Step 3: Semi-solid Stirring：
It is first 580 DEG C~630 DEG C using mechanical system stirring semi-solid material, whipping temp in scoop, stirring intensity
For 2r/s~6r/s, mixing time is 3min~6min, and in material and whipping process is scooped, protective gas is passed through in scoop
Prevent the burning of magnesium alloy semisolid slurry；
Step 4: squeeze cast form：
First magnesium alloy semisolid slurry is poured in feeding cylinder, pouring temperature is 580 DEG C~630 DEG C, then by extrusion casint
Machine drift steadily promotes semi solid slurry towards mold cavity, adjusts extrusion casint parameter：Squeeze pressure be 90MPa~
130MPa, dwell time are 20s~40s, and drift extrusion speed is 0.08m/s~0.2m/s, so far, complete magnesium alloy auto branch
The extrusion casint process of frame class part, finally taking-up spray, which is put into water, cools.
Embodiment two：Illustrate present embodiment with reference to Fig. 1, the step of present embodiment one in magnesium alloy materials
Preheating temperature is 225 DEG C, and crucible heating-up temperature is 425 DEG C, and inoculating and refining temperature is 735 DEG C.It is arranged such, can effectively protects
Demonstrate,prove the melting precision of magnesium alloy.Other compositions and annexation are identical with embodiment one.
Embodiment three：Illustrate present embodiment with reference to Fig. 1, one the step of present embodiment in protective gas be
SF6+CO2Mixed gas.It is arranged such, being passed through protective gas prevents magnesium alloy from burning.Other compositions and annexation and specific reality
It is identical to apply mode one or two.
Embodiment four：Illustrate present embodiment with reference to Fig. 1, one the step of present embodiment in protective gas bag
Include 0.3%vol SF6, 50%vol CO2With 49.7%vol air.Other compositions and annexation and embodiment
First, two or three is identical.
Embodiment five：Illustrate present embodiment with reference to Fig. 1, two the step of present embodiment in mould preheating temperature
Spend for 175 DEG C, the heating-up temperature of mould is 225 DEG C.It is arranged such, ensures the preheating requirement of mould, provided for the next step
Sufficient convenience.Other compositions and annexation are identical with embodiment one, two, three or four.
Embodiment six：Illustrate present embodiment with reference to Fig. 1, three the step of present embodiment in whipping temp be
605 DEG C, whipping temp is 605 DEG C, stirring intensity 4r/s, mixing time 4.5min.It is arranged such, is stirred using mechanical system
Semi-solid material is mixed, the dendrite formed in process of setting is smashed or completely inhibited the growth of dendrite, strengthens alloy strength, it is tough
Property, improve corrosion stability, have it is stronger fill type feeding capacity, the shape for the defects of greatly reducing product stomata, shrinkage cavity and porosity
Into mechanical agitation is sufficient for mixing effect, and cost is low, and technique is simple.Other compositions and annexation and specific embodiment party
Formula one, two, three, four or five are identical.
Embodiment seven：Illustrate present embodiment with reference to Fig. 1, three the step of present embodiment in protective gas be
SF6+CO2Mixed gas.It is arranged such, prevents the burning of magnesium alloy semisolid slurry.Other compositions and annexation and specific reality
It is identical to apply mode one, two, three, four, five or six.
Embodiment eight：Illustrate present embodiment with reference to Fig. 1, three the step of present embodiment in protective gas bag
Include 0.3%vol SF6, 50%vol CO2With 49.7%vol air.Other compositions and annexation and embodiment
First, two, three, four, five, six or seven are identical.
Embodiment nine：Illustrate present embodiment with reference to Fig. 1, the cast temperature in the step 4 of present embodiment
Spend for 605 DEG C, regulation extrusion casint parameter is 110MPa, and dwell time 30s, drift extrusion speed is 0.14m/s.So set
Put, on the one hand, the extrusion speed of drift is 0.14m/s, has stronger feeding function, significantly reduces the contracting of inside parts
Pine and the generation of shrinkage cavity；On the other hand, the extrusion speed of drift is 0.14m/s, avoids because extrusion speed is too slow and increases
Magnesium alloy solidification ratio, and then increase extruding difficulty.Other compositions and annexation and embodiment one, two, three, four,
5th, six, seven or eight are identical.
Embodiment ten：Illustrate present embodiment, the magnesium alloy auto support class of present embodiment with reference to Fig. 1
Part is engine support, differential mechanism support or transmission support bracket.Other compositions and annexation and embodiment one,
2nd, three, four, five, six, seven, eight or nine are identical.
Embodiment
Embodiment one：Below by semi-solid rheological be molded production automobile differential support exemplified by conjunction with the embodiments a pair hair
It is bright to elaborate, but protection scope of the present invention is not limited to following embodiments.
Step 1: magnesium alloy smelting：
First, AZ91D magnesium alloy materials are put and is preheated to 200 DEG C~250 DEG C in an oven, cleaning crucible, which removes, to be attached on
The dirts such as the oxidizing slag of crucible surface, old coating, and in inner surface of crucible coat coating material (composition of coating is 10%~20%
The pure solution of zinc oxide, the effect of coating is protection crucible, improves the service life of crucible)；
Then, crucible is heated into 400 DEG C~500 DEG C addition magnesium alloy materials to be melted, is passed through SF6+CO2Gaseous mixture
Body (mixed gas by 0.3%vol SF6, 50%vol CO2Formed with 49.7%vol air) protected；
Finally, after magnesium alloy is completely melt, C is added in 720 DEG C~750 DEG C of aluminium alloy2Cl6Refining 5min~
15min, removes the scum silica frost on liquid level, and aluminium alloy stands and is cooled to 580 DEG C~630 DEG C of pouring temperature.
Step 2: mould preheats：
First, automobile differential bracket mould is arranged on extrusion casting machine, mould is debugged；
Then, preheated mold is to 150 DEG C~200 DEG C, and graphite spraying powder adds machine oil to mix de- in mold cavity
Mould agent (by the machine oil of 4%~6% 200#~300# graphite powder addition 94%~96%, stirs), then proceedes to add
Mold heat is to 210 DEG C and is incubated.
Step 3: Semi-solid Stirring：
First, it is 580 DEG C~630 DEG C using mechanical system stirring semi-solid material, whipping temp in scoop, stirring is strong
It is 3min~6min to spend for 2r/s~6r/s, mixing time；
Then, in material and whipping process is scooped, SF is passed through in scoop6+CO2Mixed gas prevents magnesium alloy semisolid slurry
Burning；
Step 4: squeeze cast form：
First, magnesium alloy semisolid slurry is poured in feeding cylinder, pouring temperature is 585 DEG C；
Then, extrusion casting machine drift is steadily promoted into semi solid slurry towards mold cavity, adjusts extrusion casint parameter
For, squeeze pressure 130MPa, dwell time 40s, drift extrusion speed 0.11m/s；
Finally, the extrusion casint process of magnesium alloy auto differential mechanism support is completed, taking-up spray, which is put into water, to cool.
Embodiment two
The difference of the present embodiment and embodiment one in step 2 mold preheating temperature be 220 DEG C, step 3 is squeezed
Parameter regulation is made in die casting：595 DEG C, squeeze pressure 120MPa, dwell time 35s of pouring temperature, drift extrusion speed 0.14m/
s.Other steps are identical with embodiment one.
Embodiment three
The difference of the present embodiment and embodiment one in step 2 mold preheating temperature be 230 DEG C, step 3 is squeezed
Parameter regulation is made in die casting：605 DEG C, squeeze pressure 110MPa, dwell time 30s of pouring temperature, drift extrusion speed 0.17m/
s.Other steps are identical with embodiment one.
Example IV
The difference of the present embodiment and embodiment one in step 2 mold preheating temperature be 240 DEG C, step 3 is squeezed
Parameter regulation is made in die casting：615 DEG C, squeeze pressure 100MPa, dwell time 25s of pouring temperature, drift extrusion speed 0.2m/s.
Other steps are identical with embodiment one.
Table 1 is extrusion casint and compression casting contrast table：
Table 1
Drawn the following conclusions according to table 1：
(1) compression casting abbreviation die casting, be by molten metal under the promotion of drift in quick injection to mold cavity one
Kind molding mode.Its feature is rapid shaping, and the speed at ingate is up to 40m/s, generally 20m/s~30m/s, pressure
Power is 10MPa~50MPa.Because die casting machine is mostly bedroom casting on flat machine, therefore pack completeness turns into the important parameter of die casting, and one
As pack completeness requirement be 30%~60%.The size of pack completeness has influence on molten metal volume gas situation.Die casting is different from extrusion casint,
Its ingate is typically chosen smaller, and it is 1mm~4mm to be typically chosen scope.Because its filling velocity is fast, molten metal is with turbulent flow side
Formula fills, therefore compared with extrusion casint, its porosity is far longer than extrusion casint part.But dimensional accuracy and the surface of die casting
Finish is similar with extrusion casint.
(2) injection speed of extrusion casint is typically in 0.05m/s~0.3m/s, and well below compression casting, and pressure can
To be up to 1000MPa, typically in 50MPa~200MPa, but significantly larger than compression casting.Because High Pressure Solidification and plastic deformation are same
When exist, have it is stronger fill type feeding capacity, the formation for the defects of greatly reducing product stomata, shrinkage cavity and porosity.
Its institutional framework of product prepared by semisolid method is used as uniform, tiny, torulose particle, therefore material
Properties are excellent.
Pass through a kind of semi-solid rheological shaping production magnesium alloy auto support of the present invention with reference to Fig. 2 and Fig. 3 explanations
The mechanical property of the magnesium alloy auto support parts of the method manufacture of class part：
With the rise of pouring temperature, the tensile strength of part drops to 211MPa by 307.5MPa, and elongation percentage is by 2.6%
Drop to 1.3%.At pouring temperature less than fusing point or higher than fusing point near liquidus (semisolid) when, tensile strength and
Although elongation percentage declines with the rise of pouring temperature, the amplitude declined is little.And at pouring temperature 605 DEG C~
During 635 DEG C of sections, tensile strength and elongation percentage all drastically decline.When pouring temperature continues rise, tensile strength and elongation percentage
Change it is all little, change it is more steady.The performance of material is determined by material structure.Tissue include primary grains size and
Shape, the size of eutectic structure and shape.When pouring temperature is 595 DEG C~605 DEG C, temperature is located closest to liquidus temperature
In semi-solid state, the spheric grain size now obtained is small, and spherical coefficient is high, while the same fine uniform of eutectic structure, nothing
The presence of obvious needle-like eutectic structure, therefore obtain highest mechanical property.And with the rise of pouring temperature, globular crystal crystal grain
Size raises, and spherical coefficient declines, and eutectic structure also develops into needle-like and laminated structure, therefore causes under mechanical property
Drop.And after 650 DEG C, the crystallite dimension of globular crystal is smaller and spherical coefficient is higher, but needle-like and block is presented in eutectic structure
Shape, therefore mechanical property increases, but increase rate is limited.As pouring temperature continues rise and mechanical property can be reappeared
The phenomenon that can decline.
Pouring temperature has a certain impact to the microstructure evolution tool of magnesium alloy differential mechanism support：
Fig. 4 to Fig. 7 is 595 DEG C, 605 DEG C, 615 DEG C and 625 DEG C of pouring temperature (p=110MPa, t=30s) to magnesium alloy
The influence of the microstructure evolution of differential mechanism support.
(1) it can be seen that uniformly tiny spheroidal structure can be obtained under extrusion casint near fusing point in Fig. 4.
(2) globular crystal starts to grow up in Fig. 5, and certain directionality is presented.
(3) in Fig. 6 it can be seen that tissue is mostly that twin rosiness is brilliant, and many rosiness crystalline substances be broken into it is small spherical
It is brilliant.
(4) there is larger-size dendrite in Fig. 7, and twin vestige is presented, and many dendrites also crush, bead
The brilliant distribution of shape remains to find out the vestige of dendrite.With the increase of pouring temperature, globular crystal in succession long great achievement rosiness crystalline substance with
And dendrite.
Claims (9)
- A kind of 1. method of semi-solid rheological shaping production magnesium alloy auto support parts, it is characterised in that it includes as follows Step：Step 1: magnesium alloy smelting：Magnesium alloy materials are first preheated, the preheating temperature of magnesium alloy materials is 200 DEG C~250 DEG C, clears up crucible and the table in crucible Face, which applies, coats, and then crucible is heated, and when crucible heating-up temperature is 400 DEG C~500 DEG C, adds magnesium alloy materials and enters Row fusing, being passed through protective gas prevents magnesium alloy from burning, and finally after magnesium alloy is completely melt, carries out inoculating and refining processing, becomes Matter refining temperature is 720 DEG C~750 DEG C, removes the scum silica frost on liquid level, and aluminium alloy stands and is cooled to pouring temperature；Step 2: mould preheats：First by magnesium alloy auto support parts mould installion on extrusion casting machine, preheated mold after being debugged to mould, The preheating temperature of mould is 150 DEG C~200 DEG C, and releasing agent is sprayed in mold cavity, then proceedes to heat mould, mould adds Hot temperature is 200 DEG C~250 DEG C；Step 3: Semi-solid Stirring：It is first 580 DEG C~630 DEG C using mechanical system stirring semi-solid material, whipping temp in scoop, stirring intensity 2r/ S~6r/s, mixing time are 3min~6min, and in material and whipping process is scooped, in scoop being passed through protective gas prevents The burning of magnesium alloy semisolid slurry；Step 4: squeeze cast form：First magnesium alloy semisolid slurry is poured in feeding cylinder, pouring temperature is 580 DEG C~630 DEG C, then rushes extrusion casting machine Head steadily promotes semi solid slurry towards mold cavity, adjusts extrusion casint parameter：Squeeze pressure is 90MPa~130MPa, is protected The pressure time is 20s~40s, and drift extrusion speed is 0.08m/s~0.2m/s, so far, completes magnesium alloy auto support parts Extrusion casint process, finally take out spray and be put into water and cool.
- 2. a kind of method of semi-solid rheological shaping production magnesium alloy auto support parts according to claim 1, its It is characterised by：The preheating temperature of magnesium alloy materials is 225 DEG C in step 1, and crucible heating-up temperature is 425 DEG C, inoculating and refining temperature For 735 DEG C.
- 3. a kind of method of semi-solid rheological shaping production magnesium alloy auto support parts according to claim 1, its It is characterised by：Protective gas in step 1 is SF6+CO2Mixed gas.
- 4. a kind of method of semi-solid rheological shaping production magnesium alloy auto support parts according to claim 1 or 3, It is characterized in that：Protective gas in step 1 includes 0.3%vol SF6, 50%vol CO2With 49.7%vol air.
- 5. a kind of method of semi-solid rheological shaping production magnesium alloy auto support parts according to claim 1, its It is characterised by：The preheating temperature of mould is 175 DEG C in step 2, and the heating-up temperature of mould is 225 DEG C.
- 6. a kind of method of semi-solid rheological shaping production magnesium alloy auto support parts according to claim 1, its It is characterised by：Whipping temp in step 3 is 605 DEG C, and whipping temp is 605 DEG C, stirring intensity 4r/s, and mixing time is 4.5min。
- 7. a kind of method of semi-solid rheological shaping production magnesium alloy auto support parts according to claim 6, its It is characterised by：Protective gas in step 3 is SF6+CO2Mixed gas.
- 8. a kind of method of semi-solid rheological shaping production magnesium alloy auto support parts according to claim 1 or 7, It is characterized in that：Protective gas in step 3 includes 0.3%vol SF6, 50%vol CO2With 49.7%vol air.
- 9. a kind of method of semi-solid rheological shaping production magnesium alloy auto support parts according to claim 1, its It is characterised by：Pouring temperature in step 4 is 605 DEG C, and regulation extrusion casint parameter is 110MPa, dwell time 30s, is rushed Head extrusion speed is 0.14m/s.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109079120A (en) * | 2018-08-30 | 2018-12-25 | 哈尔滨吉星机械工程有限公司 | A method of aluminium alloy automobile gearbox valve body is produced with squeeze cast form |
| CN110117727A (en) * | 2019-06-18 | 2019-08-13 | 无锡职业技术学院 | A method of particles reiforced metal-base composition is prepared based on 3D printing technique |
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| CN110117727A (en) * | 2019-06-18 | 2019-08-13 | 无锡职业技术学院 | A method of particles reiforced metal-base composition is prepared based on 3D printing technique |
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