CN106623819A - Prepration method for semisolid alloy slurry - Google Patents
Prepration method for semisolid alloy slurry Download PDFInfo
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- CN106623819A CN106623819A CN201611051773.8A CN201611051773A CN106623819A CN 106623819 A CN106623819 A CN 106623819A CN 201611051773 A CN201611051773 A CN 201611051773A CN 106623819 A CN106623819 A CN 106623819A
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- hang plate
- alloy
- thin seam
- semi
- preparation
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- 239000002002 slurry Substances 0.000 title claims abstract description 40
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 23
- 239000000956 alloy Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 47
- 239000002184 metal Substances 0.000 claims abstract description 47
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims description 31
- 238000007599 discharging Methods 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 10
- 229910001128 Sn alloy Inorganic materials 0.000 abstract description 4
- 229910000861 Mg alloy Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 229910001018 Cast iron Inorganic materials 0.000 abstract 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 1
- 229910000881 Cu alloy Inorganic materials 0.000 abstract 1
- 229910000676 Si alloy Inorganic materials 0.000 abstract 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 239000011651 chromium Substances 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 9
- 229910052710 silicon Inorganic materials 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003913 materials processing Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010099 solid forming Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a preparation method for semisolid alloy slurry and belongs to the technical field of material processing. The prepration method comprises the steps that an alloy is placed into a smelting device to be smelted to obtain metal melt, the metal melt is subjected to heat preservation at 10-50 DEG C above the liquidus for 30 min, then the metal melt is poured onto an oblique board and flows into a blank containing device along the oblique board, and accordingly semisolid slurry is obtained. A thin-gap channel is formed in the oblique board provided with a cooling device. A feed inlet is formed in the upper end of the oblique board. A discharge outlet is formed in the lower end of the oblique board. A feed funnel, the feed inlet, the thin-gap channel and the discharge outlet communicate in sequence. The discharge outlet directly faces the blank containing device. The metal melt flows into the blank containing device along the thin-gap channel in the oblique board. The preparation method can be used for preparing semisolid slurry of various alloys such as a cast iron alloy, an aluminum alloy, a magnesium alloy, a copper alloy, a tin alloy and the like and is particularly suitable for primary-hard-phase-containing hypereutectic alloys such as a hypereutectic high chromium cast iron alloy and a hypereutectic aluminum-silicon alloy, the process is simple, operation is convenient, the cost is low, and the efficiency is high.
Description
Technical field
The present invention relates to a kind of preparation method of semi-solid alloy slurry, belongs to materials processing technology field.
Background technology
Semi-solid forming technology, abbreviation SSM is 70 years 20th century by the M.C.Flemings of Massachusetts Institute Technology
What in generation, proposed.The technology is in process of setting, it is stirred vigorously, changes its forming core growth process, obtains a kind of gold
Solid-liquid mixed slurry with certain solid phase in category melt.It is low due to forming temperature, and resistance of deformation is little, the spy such as steady that fills type
Point, has a extensive future in fields such as automobile, aviations.
The preparation of semi solid slurry is the key of semi-solid-state shaping, and its preparation method mainly has two kinds：One kind is in external force
Or formed dendrite is crushed in the presence of outfield, mainly including mechanical mixing method, electromagnetic stirring method, Isothermal treatment method,
Hang plate cooling method, ultrasonic vibration method etc.；Second is that control process of setting carrys out dendrite inhibition shaping, mainly there is additive method.
Both of which has its pluses and minuses, and some has been applied in actual production.Up to the present, semi-solid-state metal
Forming technique is generally used in aluminium alloy and magnesium alloy.
Hang plate is to be used within 1996 manufacture aluminium alloy and magnesium alloy semisolid slurry by Japanese UBE companies utility model
New technology.Forming process is：The alloy melt that will be above a certain temperature of aluminium alloy phase line is cast in graphite or steel alloy is made
Hang plate on, through the chilling action of hang plate, the quick forming core of alloy melt is grown up, and on hang plate trickle process
In, melt internal grain constantly rubs, collide and finally give uniform, tiny spheroidal structure.
The oxidative phenomena of metal bath is extremely serious when conventional bevel plate prepares semi solid slurry, obtained semi solid slurry
The oxidizing slag of middle generation is more, and the mechanical property of the defective effect materials such as oxide slag inclusion is produced in actual casting forming process,
In order to improve this phenomenon, the present invention adopts thin seam hang plate, by channel interior air when metal bath flows through thin seam passage
Emptying, make metal bath flow through hang plate it is thin seam passage during hardly with air contact, can preferably prevent metal bath
Oxidation.And upper and lower two of hang plate is connected with cooling water, it is ensured that thin seam passage and metal bath contact surface keep needed for it is relatively low
Temperature, it is to avoid channel interior surface temperature is persistently raised.There is shearing on the thin each surface in passage upper and lower, left and right of stitching to metal bath
And chilling action, enhance treatment effect of the hang plate to metal bath.
The content of the invention
It is an object of the invention to provide a kind of preparation method of semi-solid alloy slurry, alloy is placed in smelting apparatus
Melting is obtained metal bath, metal bath temperature 10 DEG C of -50 DEG C of insulation 30min more than liquidus curve is made, then by metal bath
It is cast on hang plate, melt is flowed into along hang plate and holds blank device, obtains semi solid slurry；Set inside the hang plate
There is thin seam passage, hang plate is provided with cooling device；The upper end of hang plate is provided with charging aperture, and lower end is provided with discharging opening, charging leakage
Bucket, charging aperture, thin seam passage, discharging opening are sequentially communicated, and discharging opening is with to hold blank device just right；Metal bath is along hang plate
Thin seam passage road flow into hold blank device.
Thin seam passage length of the present invention is 50-600mm（Hang plate lower plate is maintained static, can by adjusting nut come
Adjust the position of hang plate upper plate to determine the length that upper plate and lower plate overlap, the part of coincidence is thin seam passage length）, lead to
The width in road is 100-200mm, is highly 5-10mm, and angle is at 10 ° -70 °（There are two can adjust up and down below hang plate
Support, the size of angle is adjusted by the height of adjusting bracket）, metal bath flow through it is thin seam passage when metal bath hardly
With air contact.
Thin seam channel interior of the present invention has been provided with thermocouple, can be real-time to flowing through the metal bath of thin seam channel interior
Temperature control.
The hang plate is made up of 45 steel, and each surface of skewing channel internal scribbles graphite, and hang plate is solid by support
Calmly on the ground, support is Height Adjustable.
Hang plate of the present invention can arrange multiple thin seam passages（Multisection type hang plate can arrange multiple thin seam passages）.
The present invention principle be：It is thin seam passage and inclining with temperature-controlled cooling device that metal bath is flowed through into an inside
Swash plate, metal bath through hang plate chilling action, the quick forming core of crystal grain in metal bath, and due to during trickling
Constantly mutually shearing, collision, friction, finally gives tiny, uniform spheroidal structure between metal bath internal grain.Thin seam passage
Inner space is narrow and small, and metal bath all empties air in passage when flowing through thin seam passage, metal bath hardly with air
Contact, preferably prevents molten metal oxidization, the oxidizing slag that obtained semi solid slurry the inside is contained compared with conventional bevel plate
Significantly reduce, the formation of the defects such as oxide slag inclusion is avoided in actual casting forming process, the mechanical property of foundry goods can be improved
Energy.Upper and lower two of hang plate is connected with cooling water, and the temperature on thin seam passage surface can be controlled, and prevents in casting process
In, thin seam passage surface is persistently overheating, it is ensured that thin seam channel table is made in the face of the lasting Quench of metal bath in casting process
With, and there are shearing, chilling action in each surface in thin seam passage upper and lower, left and right to the metal bath for flowing through thin seam passage, strengthens
Treatment effect of the hang plate to metal bath, constantly obtains even tissue, tiny half solid in continuous casting process
State slurry.
Patent of the present invention compared with prior art, this have the advantage that：
（1）This method is simple to operate, low cost, flow process are short, can be connected with follow-up former, directly processes foundry goods.
（2）Temperature control is carried out to hang plate by the cooling water of hang plate top and the bottom, prevents hang plate from holding in casting process
Temperature of continuing rising, it is ensured that lasting chilling action of the hang plate to metal bath.
（3）In casting process, the thin each surface in passage upper and lower, left and right of stitching has to the metal bath for flowing through thin seam passage
Shearing, chilling action, enhance treatment effect of the hang plate to metal bath.
（4）In casting process, thin seam channel space is narrow and small, and metal bath flows through during thin seam passage that air in passage is complete
Portion empty so that metal bath not with contacting external air, be effectively prevented the oxidation of the metal bath in casting process, greatly
The big generation for reducing oxidizing slag in semi solid slurry, avoids the defects such as oxide slag inclusion in actual casting forming process
Formed, the mechanical property of foundry goods can be improved.
Description of the drawings
Fig. 1 is apparatus of the present invention schematic diagram；
Fig. 2 is hang plate cross-sectional schematic；
Fig. 3 is the micro-organization chart of the semi solid slurry that example 1 prepares Al-25%Si-2Fe alloys；
Fig. 4 routine hang plate systems prepare the micro-organization chart of the semi solid slurry of Al-25%Si-2Fe alloys；
Fig. 5 is the micro-organization chart of the semi solid slurry that example 2 prepares Al-25%Si aluminium alloy alloys；
Fig. 6 routine hang plate systems prepare the micro-organization chart of the semi solid slurry of Al-25%Si aluminium alloy alloys；
Fig. 7 is the micro-organization chart of the semi solid slurry that example 3 prepares Cu-10%Sn alloys.
In figure：1- tapered rods；2- smelting apparatus；3- delivery ports；4- charging apertures；5- loading hoppers；7- thermocouples；8- is positioned
Bolt；9- hang plates top；10- water inlets；11- discharging openings；12- hang plates bottom；14- holds blank device.
Specific embodiment
The present invention is further described below in conjunction with the drawings and specific embodiments, but protection scope of the present invention is not
It is limited to the content.
The present invention implements 1 ~ 3 equipment therefor to be included tapered rod 1, smelting apparatus 2, loading hopper 5, hang plate, holds blank
Device 14, is provided with thin seam passage inside hang plate, hang plate is provided with cooling system；The upper end of hang plate is provided with charging aperture 4, under
End is provided with discharging opening 11, and loading hopper 5, charging aperture 4, thin seam passage, discharging opening 11 are sequentially communicated, discharging opening 11 with hold blank
Device 14 is just right, and the lower end of smelting apparatus 2 is just right with loading hopper 5；The hang plate is included under hang plate top 9 and hang plate
Portion 12, thin seam passage is located between hang plate top 9 and hang plate bottom 12, and hang plate top 9 and hang plate bottom are by fixed
Position bolt 8 connects；Thermocouple 7 is provided with thin seam passage, as shown in Figure 1 and 2.
Embodiment 1
Raw material：Al-25%Si-2%Fe aluminium alloys（573 DEG C of solidus temperature, 770 DEG C of liquidus temperature）
The metal bath of Al-25%Si-2%Fe aluminium alloys is prepared using the smelting apparatus above hang plate, melted metal is made
Temperature is maintained at 790 DEG C of insulation 30min；The thin seam hang plate with cooling device is used, thin seam passage length is
300mm, channel width are 200mm, are highly 5mm, and hang plate is 20 ° with the angle of horizontal plane.Open hang plate top melting
Tapered rod in device；Make metal bath and be cast in thin seam passage along funnel with appropriate speed, the thin seam passages of Jing are last
Slurry collection device is flowed into, semi solid slurry is finally given, slurry tissues are as shown in Figure 3.
Semi solid slurry tissue is obtained for conventional hang plate as shown in figure 4, contrast Fig. 3 and Fig. 4 can see that thin seam passage inclines
The shape great majority of semi solid slurry tissue primary silicon obtained in swash plate and Fe-riched phase are polygon and subsphaeroidal, conventional hang plate
The primary silicon of obtained semi solid slurry and Fe-riched phase are shaped as elongated rod shape or needle-like and the serious crystal grain distribution of segregation phenomena not
Uniformly；Concentrate because the crystal grain of needle-like has neighbouring generation profit that can be in acicular grains in actual application, finally cut
Split matrix.
Embodiment 2
Raw material：Al-25%Si aluminium alloys（564 DEG C of solidus temperature, 775 DEG C of liquidus temperature）
The metal bath of Al-25%Si aluminium alloys is prepared using the smelting apparatus above hang plate, melted metal temperature is protected
Hold and be incubated 30min at 785 DEG C；The thin seam hang plate with cooling device is used, thin seam passage length is 400mm, leads to
Road width is 150mm, is highly 7mm, and hang plate is 60 ° with the angle of horizontal plane.In opening hang plate top smelting apparatus
Tapered rod；Make metal bath and be cast in thin seam passage along funnel with appropriate speed, the thin seam passages of Jing are finally flowed into slurry
Material collection device, finally gives semi solid slurry, and slurry tissues are as shown in Figure 5.
Semi solid slurry tissue is obtained for conventional hang plate as shown in fig. 6, contrast Fig. 5 and Fig. 6 can see that thin seam passage inclines
The shape great majority of semi solid slurry tissue primary silicon obtained in swash plate are polygon and subsphaeroidal, conventional hang plate obtained half
The primary silicon of solid size be shaped as elongated rod shape or needle-like and the serious crystal grain distribution of segregation phenomena is uneven.Due to the crystalline substance of needle-like
There is neighbouring generation profit that can be in acicular grains in actual application and concentrate in grain, finally isolate matrix.
Embodiment 3
Raw material：Cu-10%Sn alloys（830 DEG C of solid-state temperature line, 1024 DEG C of liquidus temperature）
The metal bath of Cu-10%Sn alloys is prepared using the smelting apparatus above hang plate, melted metal temperature is kept
30min is incubated at 1060 DEG C；Using the thin seam hang plate with cooling device, thin seam passage length is 400mm, channel width
For 100mm, be highly 10mm, the angle of hang plate and horizontal plane is 30 °；Open the taper in the smelting apparatus of hang plate top
Rod, is made metal bath and is cast in thin seam passage along funnel with appropriate speed, and the thin seam passages of Jing are finally flowed into slurry receipts
Acquisition means, finally give semi solid slurry, and slurry tissues are as shown in Figure 7.
Claims (5)
1. a kind of preparation method of semi-solid alloy slurry, it is characterised in that：Alloy is placed in into melting in smelting apparatus gold is obtained
Category melt, makes 10 DEG C of -50 DEG C of insulations more than liquidus curve of metal bath temperature, and then metal bath is cast on hang plate,
Melt is flowed into along hang plate and holds blank device, obtains semi solid slurry；Thin seam passage is provided with inside the hang plate, is inclined
Plate is provided with cooling device；The upper end of hang plate is provided with charging aperture, and lower end is provided with discharging opening, and loading hopper, charging aperture, thin seam lead to
Road, discharging opening are sequentially communicated, and discharging opening is with to hold blank device just right；Metal bath is flowed into along the thin seam passage road of hang plate
Hold blank device.
2. the preparation method of semi-solid alloy slurry according to claim 1, it is characterised in that：Thin seam passage length is 50-
600mm, the width of passage is 100-200mm, is highly 5-10mm, and angle is 10 ° -70 °.
3. the preparation method of semi-solid alloy slurry according to claim 1, it is characterised in that：Thin seam channel interior has been provided with
Thermocouple.
4. the preparation method of semi-solid alloy slurry according to claim 1, it is characterised in that：The hang plate arranges multiple
Thin seam passage.
5. the preparation method of semi-solid alloy slurry according to claim 1, it is characterised in that：The hang plate passes through support
Fix on the ground, support it is Height Adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051773.8A CN106623819A (en) | 2016-11-25 | 2016-11-25 | Prepration method for semisolid alloy slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051773.8A CN106623819A (en) | 2016-11-25 | 2016-11-25 | Prepration method for semisolid alloy slurry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106623819A true CN106623819A (en) | 2017-05-10 |
Family
ID=58811190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611051773.8A Pending CN106623819A (en) | 2016-11-25 | 2016-11-25 | Prepration method for semisolid alloy slurry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106623819A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848390A (en) * | 2019-01-28 | 2019-06-07 | 浙江大学宁波理工学院 | The preparation of low-melting alloy semi solid slurry and recovery valve island heat supply integrated system |
| CN110000344A (en) * | 2019-03-14 | 2019-07-12 | 昆明理工大学 | A kind of device and method for continuously preparing semi solid slurry inhibiting ZCuSn10P1 alloy tin element segregation |
| CN110273087A (en) * | 2019-06-25 | 2019-09-24 | 昆明理工大学 | Regulate and control the method for hypereutectic aluminum-silicon alloy casting overall performance |
| CN111375748A (en) * | 2018-12-28 | 2020-07-07 | 井冈山大学 | Vibration slope casting device |
| CN113134580A (en) * | 2021-04-26 | 2021-07-20 | 兰州理工大学 | Preparation method and preparation device of metal semi-solid non-dendritic crystal slurry |
| CN113182502A (en) * | 2021-06-03 | 2021-07-30 | 东北大学 | Semi-solid pressure casting forming equipment and forming method |
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| EP2347840A2 (en) * | 2010-01-22 | 2011-07-27 | Honda Motor Co., Ltd. | Casting method and casting apparatus |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111375748A (en) * | 2018-12-28 | 2020-07-07 | 井冈山大学 | Vibration slope casting device |
| CN111375748B (en) * | 2018-12-28 | 2021-11-05 | 井冈山大学 | Vibration slope casting device |
| CN109848390A (en) * | 2019-01-28 | 2019-06-07 | 浙江大学宁波理工学院 | The preparation of low-melting alloy semi solid slurry and recovery valve island heat supply integrated system |
| CN109848390B (en) * | 2019-01-28 | 2021-01-01 | 浙江大学宁波理工学院 | Low-melting-point alloy semi-solid slurry preparation and recovery valve island type heat supply integrated system |
| CN110000344A (en) * | 2019-03-14 | 2019-07-12 | 昆明理工大学 | A kind of device and method for continuously preparing semi solid slurry inhibiting ZCuSn10P1 alloy tin element segregation |
| CN110273087A (en) * | 2019-06-25 | 2019-09-24 | 昆明理工大学 | Regulate and control the method for hypereutectic aluminum-silicon alloy casting overall performance |
| CN113134580A (en) * | 2021-04-26 | 2021-07-20 | 兰州理工大学 | Preparation method and preparation device of metal semi-solid non-dendritic crystal slurry |
| CN113182502A (en) * | 2021-06-03 | 2021-07-30 | 东北大学 | Semi-solid pressure casting forming equipment and forming method |
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