CN102489870A - Method for preparing thixomolding plate blank - Google Patents
Method for preparing thixomolding plate blank Download PDFInfo
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- CN102489870A CN102489870A CN2011104187615A CN201110418761A CN102489870A CN 102489870 A CN102489870 A CN 102489870A CN 2011104187615 A CN2011104187615 A CN 2011104187615A CN 201110418761 A CN201110418761 A CN 201110418761A CN 102489870 A CN102489870 A CN 102489870A
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Abstract
The invention relates to a method for preparing a thixomolding plate blank, which can meet the requirement of thixomolding of semisolid alloys. The method comprises the following steps of: performing homogenization annealing heat treatment on an obtained cast plate; repeatedly processing the obtained plate blank by a stir and friction processing method by using a stirring tool at a high rotating speed and a low advancing speed to obtain a fine grain structure on the whole plate blank; and cutting the plate, trimming, performing stir and friction processing, quickly heating in a heating furnace to obtain an alloy plate, feeding into a semisolid temperature region, and keeping a semisolid temperature to be a balanced temperature to obtain the semisolid alloy plate blank. A semisolid alloy material prepared by the method has small crystal grains, a high balling degree and a high thixotropic property; and the method has a simple preparation process and is not limited by the dimension of the plate blank.
Description
Technical field
The present invention relates to a kind of method for preparing thixotropic forming with slab.The present invention can be used for preparing thixotropic forming and uses the semi-solid alloy slab, and prepared semi-solid alloy has not tiny, the nodularization degree height of blow phase crystal grain, the advantage that thixotropic property is good, and also preparation technology is simple.
Background technology
The semi-solid die casting technology is an extraordinary alloy and composite near-net-shape technology.Since the seventies in 20th century MIT professor Flemings wait to propose should technology since, this technology has obtained extensive use in fields such as automobile, electronics and 3C.The semi-solid die casting technology generally includes semi-solid blank preparation, post bake and three operations of semi-solid die casting, and wherein, the technology of most critical is exactly the semisolid blank preparation.Up to the present, the preparation method of semisolid blank mainly contains mechanical mixing method, electromagnetic stirring method; Isothermal processes method and SIMA method (are seen " Harbin Institute of Technology's journal " in August, 2000, the 32nd volume, the 4th phase; " new headway in semi-solid slurry making technology ", author Cui Jianzhong etc.).Mechanical mixing method and electromagnetic stirring method need strict gas shield or seal approach, and aspect the big solid phase body branch rate semisolid blank of preparation very big difficulty are being arranged, and whole base process cost is higher.Isothermal processes method acquisition semisolid blank is organized thick, and crystal grain nodularization degree is low, is difficult to the qualified semisolid blank of preparation.By contrast, the SIMA legal system is equipped with the magnesium alloy semi solid state base has certain advantage.At first, the SIMA method is solid-state deformation inductdion, and semi-solid isothermal is handled directly thixotropic forming of back, has saved post bake process, on operation, on the cost, certain advantage is arranged all; Secondly, the SIMA method can obtain very high solid phase body branch rate.Material is incubated in required semi-solid temperature through behind the strain inducing, makes solid phase body branch rate be easy to control.But because the magnesium alloy slip system is few, the plastic deformation difficulty, therefore, the distortion operation is difficult to carry out in traditional SIMA method.Adopt the extruding of angle, isometrical road (to see " material science and technology " in October, 2010 for the strain inducing technology of magnesium alloy materials; The 18th volume, the 5th phase, " the AM60 magnesium alloy semi solid state isothermal processes research of large plastometric set "; Author Wang Ying etc.); Solved magnesium alloy well and be difficult to obtain a difficult problem, thereby made magnesium alloy materials obtain good strain inducing effect, and combined the semi-solid isothermal treatment process to realize that the fusing of strain inducing material activates than the large plastometric set amount.But the present new SIMA method that adopts needs multi-pass to process repeatedly, and technological operation is complicated.
Agitating friction processing (is seen " Rare Metals Materials and engineering " in January, 2011; The 40th volume; The 1st phase; 183～188 pages, " agitating friction working research progress and prospect forecast ", author Huang Chun equality) be a kind of method that is used for modification of material microstructure and manufacturing that on the basis of friction Stir, proposes.Its basic thought is, utilize stirring-head cause the processing district material violent plastic deformation, mixing, fragmentation, break and heat exposes, realize densified, the homogenising and the refinement of microstructure.Compare with the equal channel angular pressing method; The agitating friction process technology; Only need time processing just can realize the structure refinement of sheet alloy, the thin peritectic alloy equiax crystal degree that is obtained is high, angle of elevation crystal boundary ratio is high, and the agitating friction processing method can not receive the plate size restrictions.
This shows that the method for controlling alloy graining in utilization prepares in the process of alloy semisolid blank, the prepared composite material grains is thick, and the nodularization effect is undesirable.Though new SIMA method has certain advantage than other methods that prepare semisolid blank, because complex process, crystal grain nodularization degree is also desirable not to the utmost, and limited by board dimension.Therefore, the new alloy preparation method of semi-solid blank of invention just seems very important.
Summary of the invention
The objective of the invention is to realize that the not molten crystal grain of utilization agitating friction processing and preparing is tiny, the semisolid slab that the nodularization degree is high provides a kind of method for preparing thixotropic forming with slab.
The process that realizes step of the present invention is:
1. the virgin alloy slab that adopts the casting preparation being carried out homogenizing annealing handles;
2. use the agitating friction method for processing, stirring tool under the high rotating speed, under the low gait of march condition acquisition slab is carried out multi-pass and processes continuously, finally on whole slab, obtain fine grained texture;
3. shear, repair agitating friction processing sheet material afterwards;
4. the alloy plate material after in heating furnace, will processing is heated rapidly to the semi-solid temperature interval, and is incubated to the blank temperature equilibrium in this semi-solid temperature, obtains to have the semi-solid die casting slab that spherical, tiny solid phase constitutes.
Beneficial effect of the present invention is:
1. blow phase crystal grain is not tiny after remelting, the nodularization degree high, thixotropic property is excellent for the semi-solid blank of utilization agitating friction processing method preparation, and need not prolong temperature retention time.
2. preparation method's technology of the alloy semi-solid die casting slab described in the present invention is simple and do not receive the restriction of board dimension.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
Fig. 1 is the sketch map that the agitating friction processing method prepares the semi-solid die casting slab;
Fig. 2 is an agitating friction machining path sketch map.
Among the figure, 1 is the following shoulder of stirring and processing instrument, and 2 is processed sheet alloy, and 3 is the mixing needle of stirring and processing instrument, and going up of 4 stirring and processing instruments takeed on.Employed stirring and processing instrument comprises shoulder 4, takes on 1 and mixing needle 3 down, and the diameter of shoulder is b, and to be that a, pin are long be c to the upper diameter of pin.
The specific embodiment
Referring to Fig. 1, Fig. 2.It is of the present invention that to prepare thixotropic forming following with the step of the method for slab:
1. the virgin alloy slab that adopts the casting preparation being carried out homogenizing annealing handles;
2. use the agitating friction method for processing, stirring tool under the high rotating speed, under the low gait of march condition acquisition slab is carried out multi-pass and processes, finally on whole slab, obtain fine grained texture;
3. the sheet material corner with the preparation of agitating friction processing method cuts away, and obtains to be used for the slab of semisolid remelting;
4. the alloy plate material after will processing is placed in the heating furnace and heats, and is heated rapidly to the semi-solid temperature interval, and is incubated to temperature equalization in this semi-solid temperature, obtains to have semi-solid die casting slab spherical, tiny solid phase.
Experiment material is semicontinuous as cast condition 7075 aluminium alloys, and its chemical composition is: wt%5.6Zn-2.5Mg-1.6Cu-0.23Cr-balAl.At first, intercepting goes out as cast condition 7075 sheet alloys that thickness is 15mm, and the acquisition sheet alloy is incubated 24 hours at 462 ℃, is warming up to 470 ℃ and be incubated 4 hours with the speed of 0.5 ℃/min then, carries out Water Quenching again; Secondly; This 7075 aluminium alloy is carried out the friction Stir machining experiment; The stirring and processing instrument shoulder breadth that is adopted is 16mm, and pin is the last wide 10mm of being, the wide 8mm of being, length are that it is the 0.5mm screw thread that the taper pin of 14.9mm, side have pitch down; In the stirring and processing process, the inclination angle of stirring tool is 2.5 °.With workpiece fixing after, adopt under the gait of march condition of instrument velocity of rotation and 15-25mm/min of 1500rpm, carry out multi-pass according to machining path shown in Figure 2 and process; Once more, the sheet material after the agitating friction processing is cut, repairs; At last; In heating furnace, fast slab is heated to 562 ℃ (solidus temperature of this alloy is 535 ℃, and liquidus temperature is 592 ℃), treat the plate temperature constant after; The acquisition solid rate is 55% semisolid slab; This semisolid plate not diameter of blow phase is 25-40 μ m, and the nodularization degree is high, has good thixotropic property.
Experiment material is the A356 alloy, and the chemical composition of A356 is wt%7Si-0.32Mg-0.14Fe-0.19Cu-0.08Mn-0.09Zn-0.20Ti-balAl.At first, intercepting goes out the as cast condition A356 sheet alloy that thickness is 10mm, and the acquisition sheet alloy is incubated 2-4 hour at 535 ℃, carries out Water Quenching again; Secondly; This A356 aluminium alloy is carried out the friction Stir machining experiment; The stirring and processing instrument shoulder breadth that is adopted is 20mm, and pin is the last wide 14mm of being, the wide 12mm of being, length are that it is the 0.5mm screw thread that the taper pin of 9.9mm, side have pitch down; In the stirring and processing process, the inclination angle of stirring tool is 2.5 °.With workpiece fixing after, adopt under the gait of march condition of instrument velocity of rotation and 10-15mm/min of 1000rpm, carry out multi-pass according to machining path shown in Figure 2 and process; Once more, the sheet material after the agitating friction processing is cut, repairs; At last; In heating furnace, fast slab is heated to 580 ℃ (solidus temperature of this alloy is 545 ℃, and liquidus temperature is 615 ℃), treat the plate temperature constant after; The acquisition solid rate is 50% semisolid slab; This semisolid plate not diameter of blow phase is 15-35 μ m, and the nodularization degree is high, has good thixotropic property.
Experiment material is an as cast condition AM60 magnesium alloy materials, and its alloying component is: wt%6.5Al-0.13Mn-0.005Fe-0.01Cu-0.02Ni-Bal.Mg.At first, intercepting goes out the AM60 as-cast magnesium alloy sheet material that thickness is 10mm, and the acquisition sheet alloy is heated to 350 ℃ earlier in chamber type electric resistance furnace, and insulation 1h is heated to 410 ℃ then, and insulation 20h is with 70 ℃ water-quenching; Secondly; This AM60 as-cast magnesium alloy material is carried out the friction Stir machining experiment; The stirring and processing instrument shoulder breadth that is adopted is 16mm, and pin is the last wide 10mm of being, the wide 8mm of being, length are that it is the 0.2mm screw thread that the taper pin of 9.9mm, side have pitch down; In the stirring and processing process, the inclination angle of stirring tool is 2.5 °.With workpiece fixing after, adopt under the gait of march condition of instrument velocity of rotation and 15-25mm/min of 1500rpm, carry out multi-pass according to machining path shown in Figure 2 and process; Once more, the sheet material after the agitating friction processing is cut, repairs; At last; In heating furnace, fast slab is heated to 585 ℃ (solidus temperature of this alloy is 540 ℃, and liquidus temperature is 615 ℃), treat the plate temperature constant after; The acquisition solid rate is 50% semisolid slab; This semisolid plate not diameter of blow phase is 20-30 μ m, and the nodularization degree is high, has good thixotropic property.
Experiment material is the AZ31 magnesium alloy, and its chemical composition is: wt%3Al-1Zn-0.3Mn-0.004Si-0.002Cu-0.001Fe-0.04Ca-0.003Ni-Bal.Mg.At first, intercepting goes out the AZ31 as-cast magnesium alloy sheet material that thickness is 30mm, and the acquisition sheet alloy is heated to 400 ℃ earlier in chamber type electric resistance furnace, and 10h is in the room temperature shrend in insulation; Secondly; This AZ31 as-cast magnesium alloy material is carried out the friction Stir machining experiment; The stirring and processing instrument shoulder breadth that is adopted is 20mm, and pin is the last wide 20mm of being, the wide 14mm of being, length are that it is the 0.2mm screw thread that the taper pin of 29.8mm, side have pitch down; In the stirring and processing process, the inclination angle of stirring tool is 2.5 °.With workpiece fixing after, adopt under the gait of march condition of instrument velocity of rotation and 25mm/min of 2000rpm, carry out multi-pass according to machining path shown in Figure 2 and process; Once more, the sheet material after the agitating friction processing is cut, repairs; At last; In heating furnace, fast slab is heated to 595 ℃ (solidus temperature of this alloy is 546 ℃, and liquidus temperature is 619 ℃), treat the plate temperature constant after; The acquisition solid rate is 50% semisolid slab; This semisolid plate not diameter of blow phase is 25-35 μ m, and the nodularization degree is high, has good thixotropic property.
Agitating friction is processed under the high hot initial conditions among the present invention, can cause that the part low melting point incipient melting takes place mutually, gathers partially in the processed sheet material, is distributed in the crystal boundary place of recrystal grain.Appropriate change agitating friction processing technology can make the alloy structure with various grain sizes; Secondly, adjustment remelting heating-up temperature can be controlled fraction solid; Once more, because agitating friction is processed axle property height such as thin peritectic alloy, in reflow process, do not need long-time insulation can obtain the high not blow phase of nodularization rate.Therefore, adopt the agitating friction method for processing to prepare thixotropic forming and use slab, technical process is simple, the production efficiency height, to obtain the semi-solid blank thixotropic property good.
Need to prove at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to preferred embodiment the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the aim and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. method for preparing thixotropic forming with slab is characterized in that following steps are arranged:
1. the alloy slab that adopts the casting preparation being carried out homogenizing annealing handles;
2. use the agitating friction method for processing, stirring tool carries out multi-pass processing to the acquisition slab under the condition that high speed rotating speed, low speed are advanced, finally on whole slab, obtain fine grained texture;
3. shear, repair agitating friction processing sheet material afterwards;
4. the sheet alloy that heating obtains in the heating furnace, the semi-solid temperature that is warmed up to this alloy rapidly is interval, and is incubated to temperature equalization in this semi-solid temperature, obtains the semi-solid die casting slab with spherical, tiny not blow phase.
2. the method for preparing the thixotroping moulding with slab according to claim 1 is characterized in that: the alloy slab of the 1. middle casting preparation of said step is wrought aluminium alloy, Birmasil, wrought magnesium alloy, cast magnesium alloy etc.; Said step 2. in employed stirring and processing instrument be the both shoulders agitator, the width between two shoulders is that pin is long suitable with processed thickness of slab, in process; The stirring tool rotary speed that is adopted is 1000-2000rpm; The gait of march of stirring and processing instrument is 10-25mm/min, after processing a passage, the stirring and processing instrument is moved a pin width from second passage of reprocessing; So repeatedly, up to whole sheet material completion of processing.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012415A (en) * | 2017-04-20 | 2017-08-04 | 哈尔滨工业大学 | A kind of preparation method of wrought aluminium alloy high solid fractions semi solid slurry applied to semi-solid die casting |
| CN107557626A (en) * | 2017-10-09 | 2018-01-09 | 燕山大学 | A kind of method for preparing anisotropy aluminum alloy plate materials |
| CN112030082A (en) * | 2020-08-05 | 2020-12-04 | 昆明理工大学 | Method for preparing metal semi-solid slurry by preheating treatment SIMA method |
| CN115433890A (en) * | 2022-08-10 | 2022-12-06 | 昆明理工大学 | Short-time preparation method of refined semi-solid blank |
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| CN1560312A (en) * | 2004-03-12 | 2005-01-05 | 西北工业大学 | Semi-solid deforming alloy |
| CN1654699A (en) * | 2005-03-28 | 2005-08-17 | 南昌大学 | Method for AZ61 magnesium alloy semi-solid blank |
| CN1804069A (en) * | 2005-12-01 | 2006-07-19 | 南昌大学 | Method for preparing AZ61 magnesium alloy semi-solid remelting structure |
| CN101058877A (en) * | 2007-03-12 | 2007-10-24 | 兰州理工大学 | Method of preparing thin crystal layer on magnesium alloy surface |
| CN101284298A (en) * | 2008-06-05 | 2008-10-15 | 中国船舶重工集团公司第十二研究所 | Preparation method of aluminium alloy semi-solid state blank for large size forging |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1560312A (en) * | 2004-03-12 | 2005-01-05 | 西北工业大学 | Semi-solid deforming alloy |
| CN1654699A (en) * | 2005-03-28 | 2005-08-17 | 南昌大学 | Method for AZ61 magnesium alloy semi-solid blank |
| CN1804069A (en) * | 2005-12-01 | 2006-07-19 | 南昌大学 | Method for preparing AZ61 magnesium alloy semi-solid remelting structure |
| CN101058877A (en) * | 2007-03-12 | 2007-10-24 | 兰州理工大学 | Method of preparing thin crystal layer on magnesium alloy surface |
| CN101284298A (en) * | 2008-06-05 | 2008-10-15 | 中国船舶重工集团公司第十二研究所 | Preparation method of aluminium alloy semi-solid state blank for large size forging |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012415A (en) * | 2017-04-20 | 2017-08-04 | 哈尔滨工业大学 | A kind of preparation method of wrought aluminium alloy high solid fractions semi solid slurry applied to semi-solid die casting |
| CN107012415B (en) * | 2017-04-20 | 2019-02-01 | 哈尔滨工业大学 | A kind of preparation method of the wrought aluminium alloy high solid fractions semi solid slurry applied to semi-solid die casting |
| CN107557626A (en) * | 2017-10-09 | 2018-01-09 | 燕山大学 | A kind of method for preparing anisotropy aluminum alloy plate materials |
| CN107557626B (en) * | 2017-10-09 | 2019-02-01 | 燕山大学 | A method of preparing anisotropy aluminum alloy plate materials |
| CN112030082A (en) * | 2020-08-05 | 2020-12-04 | 昆明理工大学 | Method for preparing metal semi-solid slurry by preheating treatment SIMA method |
| CN115433890A (en) * | 2022-08-10 | 2022-12-06 | 昆明理工大学 | Short-time preparation method of refined semi-solid blank |
| CN115433890B (en) * | 2022-08-10 | 2023-09-01 | 昆明理工大学 | Short-time preparation method of thinned semi-solid blank |
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Application publication date: 20120613 |