CN109763080A - A kind of melting low temperature solid solution heat treatment method of pack alloy - Google Patents

A kind of melting low temperature solid solution heat treatment method of pack alloy Download PDF

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Publication number
CN109763080A
CN109763080A CN201910227173.XA CN201910227173A CN109763080A CN 109763080 A CN109763080 A CN 109763080A CN 201910227173 A CN201910227173 A CN 201910227173A CN 109763080 A CN109763080 A CN 109763080A
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China
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melting
alloy
almgznsi
casting
furnace
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CN201910227173.XA
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赵宇宏
闫锋
张羽
侯华
袁野
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North University of China
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North University of China
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Abstract

The present invention relates to a kind of melting low temperature solid solution heat treatment methods of pack alloy, have compared with the background art apparent advanced, it is the case where can not be heat-treated for conventional pack alloy, the solid solubility temperature of AlMgZnSi pack alloy is reduced 60-100 DEG C, realize the heat treatment to die casting, casting blistering deformation is avoided, hardness is promoted by the 127.02HV before being heat-treated to 171.96HV;Yield strength is promoted by the 253.58Mpa before being heat-treated to 407.07Mpa;Tensile strength is promoted by the 314.55Mpa before being heat-treated to 460.12Mpa;Elongation is promoted by 3.59% before being heat-treated to 4.33%.This process, accurate data is full and accurate, illustrates that pack alloy can carry out low temperature solution heat treatment, mechanical property has a distinct increment after Low Temperature Heat Treatment, breaches the limitation of traditional pack alloy.

Description

A kind of melting low temperature solid solution heat treatment method of pack alloy
Technical field
The present invention relates to a kind of melting low temperature solid solution heat treatment methods of pack alloy, belong to nonferrous materials preparative The technical field that can be handled and apply.
Background technique
Compression casting is one of the important means of aluminium alloy castings production, is cleaned up suitable for production thin-walled, complex-shaped, wheel Clear casting, cast structure is fine and close, mechanical property is good, and high production efficiency produces characteristic at low cost in enormous quantities.
Since compression casting has the characteristics that high pressure, high speed, Solidification Microstructure of Castings often can be with small stomata.It is conventional to use AlSiCu diecasting alloys in main hardening constituent be Al2Cu, solution heat treatment are needed in 500 DEG C or more a few hours heat-retaining conditions It is lower to complete;If carrying out solution heat treatment to it, the Minute pores in casting can expand and cause surface blisters even Deformation, therefore conventional die casting can not usually carry out heat treatment and improve cast properties, this significantly limits aluminum alloy die casting Application range.
Summary of the invention
Goal of the invention
It is molten to aluminium alloy the purpose of the present invention is expanding the drawbacks of causing deformation for background technique aluminium alloy Minute pores It is dissolved after refining die casting, aging strengthening model, changes the metallographic structure of pack alloy, promote the synthesis mechanical property of aluminium alloy Can, to expand the application range of aluminium alloy.
Technical solution
The chemical substance material that the present invention uses are as follows: aluminium alloy, zinc oxide, waterglass, dehydrated alcohol, deionized water, a combination thereof It is as follows to prepare dosage: being measurement unit with gram, milliliter
Aluminium alloy: AlMgZnSi 18000g ± 0.01g
Zinc oxide: ZnO 80g ± 0.01g
Waterglass: Na2SiO3·9H2O 25g±0.01g
Dehydrated alcohol: C2H5OH 1000mL ± 50mL
Deionized water: H2O 300mL ± 10mL
The melting of aluminium alloy, die casting, thermal treatment producing method are as follows:
(1) coating agent is prepared
Weigh zinc oxide 80g ± 0.01g, waterglass 25g ± 0.01g;Deionized water 300mL ± 10mL is measured, mixing hollander is added Middle stirring, at thick after stirring, as coating agent;
(2) AlMgZnSi aluminium alloy is pre-processed
1. AlMgZnSi aluminium alloy is placed on steel plate, cutting is blocking, and block size is≤8mm × 6mm × 8mm;
2. AlMgZnSi aluminium alloy block is placed in heat-treatment furnace, preheated, 200 DEG C of preheating temperature, preheating time 30min;
(3) die casting, metal fluid catheter are pre-processed
1. being preheated to die casting with temperature cycles control machine, 200 DEG C of preheating temperature, preheating time 120min;It opens Molten metal conduit heater, preheating molten metal conduit temperature set 200 DEG C, preheating time 60min;
2. the coating agent of preparation is coated uniformly on mold cavity surface, coat thickness 0.15mm;
(4) melting of AlMgZnSi aluminium alloy
The melting of AlMgZnSi aluminium alloy carries out in electromagnetic agitation smelting furnace, is in heating, melting, heat preservation, electromagnetic agitation mistake It is completed in journey;
1. opening electromagnetic agitation melting bell, with washes of absolute alcohol melting kettle inner wall, make clean inside crucible;
2. AlMgZnSi aluminium alloy block 18000g ± 0.01g is placed in melting kettle, closed electromagnetic stir-melting furnace;
3. opening electromagnetic agitation smelting furnace heater, preheated, 200 DEG C of preheating temperature, preheating time 15min;
4. continuing to heat after the completion of preheating, in-furnace temperature is adjusted to 750 DEG C ± 1 DEG C, smelting time 120min, Cheng Rong after melting Liquid;
5. opening electromagnetic mixing apparatus control switch, stirring parameter is set, electromagnetic agitation frequency is 35Hz, constant temperature stirring Time 15min;
(5) it casts
1. closing up mould of die casting machine, and start clamping system fixing mould;
2. opening molten metal duct valve, the melt in crucible flows through conduit, is pressed into die casting machine injection chamber;
3. starting injection program, injection punch head advances at a slow speed, seals catheter interface, and formed punch is by melt indentation type chamber, formed punch pressure For 130Mpa, shot time 3s;
4. injection punch head continues to track pressure maintaining forward after melt fills full type chamber, pressure maintaining pressure is 150Mpa, dwell time 20s, until melt solidifies;
(6) it is opened, modifies
1. opening mold, formed punch return is synchronous with die sinking movement to be carried out, and dynamic model is detached from stent, and formed punch, which returns, to be resetted, and ejection is simultaneously Take out casting;
It carries out being cooled to 25 DEG C on steel plate 2. casting is placed in;
3. with the sand paper polishing cast(ing) surface of 400 mesh;
4. making its cleaning with washes of absolute alcohol casting periphery and surface, at magnalium zinc silicon pack alloy;
(7) it is heat-treated AlMgZnSi pack alloy
1. heat-treatment furnace is warming up to 460 DEG C, 30min is kept the temperature, AlMgZnSi pack alloy pole shape casting is put into hot place It manages in furnace, is dissolved, solution time 60min, be put into casting rapidly after solid solution in 20 DEG C of water cooling, cooling time is 15s;
2. the casting after solid solution is carried out ageing treatment, aging temp is 180 DEG C, aging time 90min, will casting after timeliness Part, which is placed on rapidly on 20 DEG C of steel plate, carries out air cooling, and cooling time, 10min, was low temperature solution heat treatment after cooling Pack alloy after reason;
3. making surface cleaning with the sand paper polishing cast(ing) surface of 400 mesh;
4. making its cleaning with washes of absolute alcohol casting periphery and surface;
(8) test, analysis and characterization
The pattern, metallurgical structure, mechanical property of the AlMgZnSi pack alloy pole body of preparation are detected, divided Analysis, characterization;
Metallographic structure morphology analysis is carried out to casting with scanning electron microscope;
Differential thermal analysis is carried out with scanning calorimeter;
Hardness analysis is carried out with micro Vickers;
Yield strength, tensile strength and elongation percentage analysis are carried out with micro-processor controlled electronic universal tester and extensometer;
Conclusion: AlMgZnSi pack alloy is pole shape, and after heat treatment, alloy rigidity reaches 171.96HV, relative to as cast condition 35.38%, yield strength 407.06MPa are improved, relative to as cast condition raising 65.46%, tensile strength 460.12MPa, phase 46.5% is improved for as cast condition, elongation percentage improves 20.61% up to 4.33%, relative to as cast condition.
Beneficial effect
There is apparent advance compared with the background technology, the present invention, can not be heat-treated and be improved for conventional die casting The solid solubility temperature of AlMgZnSi pack alloy is reduced 60-100 DEG C by the case where cast properties, is realized at the heat to die casting It manages while avoiding casting blistering deformation, hardness is promoted by the 127.02HV before being heat-treated to 171.96HV;Yield strength is by heat 253.58Mpa before processing is promoted to 407.07Mpa;Tensile strength by before being heat-treated 314.55Mpa promoted to 460.12Mpa;Elongation is promoted by 3.59% before being heat-treated to 4.33%.This process accurate data is full and accurate, illustrates this Aluminium alloy can carry out Low Temperature Heat Treatment, and mechanical property has a distinct increment after Low Temperature Heat Treatment, breach traditional die casting The limitation of aluminium alloy.
Detailed description of the invention
The melting die casting state diagram of Fig. 1, pack alloy;
The metallographic structure shape appearance figure of Fig. 2, pack alloy;
The differential thermal analysis curve of Fig. 3, pack alloy;
As shown in the figure, list of numerals is as follows:
1, electromagnetic agitation smelting furnace, 2, bell, 3, hydraulic drive bar, 4, extrusion head, 5, furnace chamber, 6, pedestal, 7, workbench, 8, molten Refine crucible, 9, heater, 10, semi-solid slurry, 11, fixed plate, 12, electromagnetic mixing apparatus, 13, metal fluid catheter, 14, conduit Heating device, 15, valve, 16, injection chamber, 17, injection punch head, 18, fixed form, 19, cover half, 20, mold closing mechanism plate, 21, Clamping, 22, moving die plate, 23, dynamic model, 24, die heater, 25, heat-conducting oil pipes, 26, injection mechanism, 27, liftout attachment, 28, guide rod.
Specific embodiment
The present invention will be further described below with reference to the accompanying drawings:
Shown in Fig. 1, the melting die casting state diagram of pack alloy, each portion position, connection relationship are correct, firmly install, sequentially grasp Make.
The magnitude for the chemical substance that preparation melting uses is determined by pre-set range, is metering with gram, milliliter Unit.
The melting of pack alloy is carried out in electromagnetic agitation smelting furnace, is stirred in heating, melting, heat preservation, electromagnetism It mixes, completed in compacting process;The compacting of pack alloy is carried out in die casting machine, is completed in injection, pressure maintaining period 's;
It is bell 2 above electromagnetic agitation smelting furnace 1, hydraulic drive bar 3 passes through the extrusion head 4 in the connection furnace of bell 2;Electromagnetic agitation It is furnace chamber 5, bottom inside smelting furnace 1 is pedestal 6;Bottom is equipped with workbench 7 in furnace chamber 5, places melting earthenware on the table 7 Crucible 8,8 outer ring of melting kettle are heaters 9, and melt 10 is made by the heating of heater 9, is fixed plate 11 outside heater 9, Gu It is electromagnetic mixing apparatus 12 outside fixed board 11, opens electromagnetic mixing apparatus 12 and melt 10 is stirred;Hydraulic drive bar 3 is downward Extrusion head 4 is pushed to be compacted melt 10;
13 one end of metal fluid catheter connect melting kettle 8, outside package heating conduit device 14, starting heating conduit device 14 into Row preheating, Open valve 15, extrusion head 4 extrude melt 10, metal fluid catheter 13 are flowed through, into die casting machine injection chamber 16;
16 right end of injection chamber is injection punch head 17, and left end is fixed form 18, and cover half 19 is housed on fixed form 18, passes through guide rod 28 connect mold closing mechanism plates 20, moving die plate 22, there is clamping 21 on mold closing mechanism plate 20, and clamping 21 pushes mobile mould Plate 22 engages cover half 19 with dynamic model 23, and die heater 24 connects cover half 19 and dynamic model 23 by heat-conducting oil pipes 25 and carries out to mold Preheating, injection mechanism 26 push injection punch head 17 by 10 indentation type chamber of melt, after melt is cooling simultaneously by the ejection of liftout attachment 27 Take out die cast part.
Shown in Fig. 2, the metallographic structure shape appearance figure of pack alloy, figure a, b are respectively the as cast condition and low temperature of pack alloy Microstructure figure after solid solution and aging strengthening model, it can be found that the eutectic of black textured before low temperature solution heat treatment Al-Mg2Si phase and the block-like nascent Mg of black2Si phase, the AlMgZn phase of white irregular shape are located at the Primary α-Al Phase of as cast condition Or between eutectic born of the same parents and Primary α-Al Phase, in low temperature solid solution heat treatment process, come into being the part in alloy structure Mg2Si phase is sent out Raw spherodization, so that its crystallite dimension becomes smaller;AlMgZn phase is partially added in primary aluminium tissue, and shape is precipitated in ag(e)ing process At nano-sized particles, as hardening constituent, it is uniformly distributed in the base, thus the alloy mechanical property after heat treatment improves.
It is the differential thermal analysis curve of pack alloy shown in Fig. 3, it can be found that the differential thermal analysis of pack alloy is bent from figure For line there are four endothermic peaks, corresponding back dissolving temperature is respectively 458.967 DEG C, 585.607 DEG C, 592.438 DEG C, 677.858 ℃;The corresponding phase of four endothermic peaks is AlMgZn phase, AlFeMnSi, Mg respectively2Si phase, α-Al phase, it is seen that in 460 DEG C of low-temperature solids Molten heat treatment is precipitated to form nano-sized particles reinforcing in ag(e)ing process so that AlMgZn phase is partially added in primary aluminium tissue Phase is uniformly distributed in the base.

Claims (2)

1. a kind of melting low temperature solid solution heat treatment method of pack alloy, it is characterised in that:
The chemical substance material used are as follows: aluminium alloy, zinc oxide, waterglass, dehydrated alcohol, deionized water, a combination thereof prepare to use It measures as follows: being measurement unit with gram, milliliter
Aluminium alloy: AlMgZnSi 18000g ± 0.01g
Zinc oxide: ZnO 80g ± 0.01g
Waterglass: Na2SiO3·9H2O 25g±0.01g
Dehydrated alcohol: C2H5OH 1000mL ±50mL
Deionized water: H2O 300mL ±10mL
The melting of aluminium alloy, die casting, thermal treatment producing method are as follows:
(1) coating agent is prepared
Weigh zinc oxide 80g ± 0.01g, waterglass 25g ± 0.01g;Deionized water 300mL ± 10mL is measured, mixing hollander is added Middle stirring, at thick after stirring, as coating agent;
(2) AlMgZnSi aluminium alloy is pre-processed
1. AlMgZnSi alloy is placed on steel plate, cutting is blocking, and block size is≤8mm × 6mm × 8mm;
2. AlMgZnSi alloy block is placed in heat-treatment furnace, preheated, 200 DEG C of preheating temperature, preheating time 30min;
(3) die casting, metal fluid catheter are pre-processed
1. being preheated to die casting with temperature cycles control machine, 200 DEG C of preheating temperature, preheating time 120min;It opens Molten metal conduit heater, preheating molten metal conduit temperature set 200 DEG C, preheating time 60min;
2. the coating agent of preparation is coated uniformly on mold cavity surface, coat thickness 0.15mm;
(4) melting of AlMgZnSi aluminium alloy
The melting of AlMgZnSi aluminium alloy carries out in electromagnetic agitation smelting furnace, is in heating, melting, heat preservation, electromagnetic agitation mistake It is completed in journey;
1. opening electromagnetic agitation melting bell, with washes of absolute alcohol melting kettle inner wall, make clean inside crucible;
2. AlMgZnSi aluminium alloy block 18000g ± 0.01g is placed in melting kettle, closed electromagnetic stir-melting furnace;
3. opening electromagnetic agitation smelting furnace heater, preheated, 200 DEG C of preheating temperature, preheating time 15min;
4. continuing to heat after the completion of preheating, in-furnace temperature is adjusted to 750 DEG C ± 1 DEG C, smelting time 120min, Cheng Rong after melting Liquid;
5. opening electromagnetic mixing apparatus control switch, stirring parameter is set, electromagnetic agitation frequency is 35Hz, constant temperature stirring Time 15min;
(5) it casts
1. closing up mould of die casting machine, and start clamping system fixing mould;
2. opening molten metal duct valve, the melt in crucible flows through conduit, is pressed into die casting machine injection chamber;
3. starting injection program, injection punch head advances at a slow speed, seals catheter interface, and formed punch is by melt indentation type chamber;
4. injection punch head continues to track pressure maintaining forward after melt fills full type chamber, pressure maintaining pressure is 150Mpa, dwell time 20s, until melt solidifies;
(6) it is opened, modifies
1. opening mold, formed punch return is synchronous with die sinking movement to be carried out, and dynamic model is detached from stent, and formed punch, which returns, to be resetted, and ejection is simultaneously Take out casting;
Casting is placed in and carries out being cooled to 25 DEG C on steel plate;
2. with the sand paper polishing cast(ing) surface of 400 mesh;
3. making its cleaning with washes of absolute alcohol casting periphery and surface, at magnalium zinc silicon pack alloy;
(7) it is heat-treated AlMgZnSi pack alloy
1. heat-treatment furnace is warming up to 460 DEG C, 30min is kept the temperature, AlMgZnSi pack alloy pole shape casting is put into hot place It manages in furnace, is dissolved, solution time 60min, be put into casting rapidly after solid solution in 20 DEG C of water cooling, cooling time is 15s;
2. the casting after solid solution is carried out ageing treatment, aging temp is 180 DEG C, aging time 90min, will casting after timeliness Part, which is placed on rapidly on 20 DEG C of steel plate, carries out air cooling, and cooling time, 10min, was low temperature solution heat treatment after cooling The pack alloy of reason;
3. making surface cleaning with the sand paper polishing cast(ing) surface of 400 mesh;
4. making its cleaning with washes of absolute alcohol casting periphery and surface;
(8) test, analysis and characterization
The pattern, metallurgical structure, mechanical property of the AlMgZnSi pack alloy pole body of preparation are detected, divided Analysis, characterization;
Metallographic structure morphology analysis is carried out to casting with scanning electron microscope;
Differential thermal analysis is carried out with scanning calorimeter;
Hardness analysis is carried out with micro Vickers;
Yield strength, tensile strength and elongation percentage analysis are carried out with micro-processor controlled electronic universal tester and extensometer;
Conclusion: AlMgZnSi pack alloy is pole shape, and after heat treatment, alloy rigidity reaches 171.96HV, relative to as cast condition 35.38%, yield strength 407.06MPa are improved, relative to as cast condition raising 65.46%, tensile strength 460.12MPa, phase 46.5% is improved for as cast condition, elongation percentage improves 20.61% up to 4.33%, relative to as cast condition.
2. a kind of melting low temperature solid solution heat treatment method of pack alloy according to claim 1, it is characterised in that:
The melting of pack alloy is carried out in electromagnetic agitation smelting furnace, is in heating, melting, heat preservation, electromagnetic agitation, pressure It is completed during real;The compacting of pack alloy is carried out in die casting machine, is completed in injection, pressure maintaining period;
It is bell (2) that hydraulic drive bar (3) passes through the extrusion head (4) in bell (2) connection furnace above melting resistance furnace (1);Electricity It is furnace chamber (5) that magnetic stir-melting furnace (1) is internal, bottom is pedestal (6);Workbench (7) are equipped in furnace chamber (5) interior bottom, in work Make to place melting kettle (8) on platform (7), melting kettle (8) outer ring is heater (9), and it is solid to be made half by heater (9) heating State slurry (10), external heater (9) is fixed plate (11), is electromagnetic mixing apparatus (12) outside fixed plate (11), opens electric Magnetic agitating device (12) is stirred semi solid slurry (10);It is solid that hydraulic drive bar (3) pushes down on extrusion head (4) compacting half State slurry (10);
Metal fluid catheter (13) one end connects melting kettle (8), outside package heating conduit device (14), starting heating conduit dress It sets (14) to be preheated, Open valve (15), extrusion head (4) extrudes semi solid slurry (10), metal fluid catheter (13) are flowed through, Into die casting machine injection chamber (16);
Injection chamber (16) right end is injection punch head (17), and left end is fixed form (18), and cover half is housed on fixed form (18) (19), mold closing mechanism plate (20), moving die plate (22) are connected by guide rod (28), mold closing mechanism plate has clamping on (20) (21), clamping (21) pushes moving die plate (22), engages cover half (19) with dynamic model (23), and die heater (24) passes through thermally conductive Oil pipe (25) connection cover half (19) and dynamic model (23) preheat mold, and injection mechanism (26) pushes injection punch head (17) will melt Liquid (10) indentation type chamber is ejected by liftout attachment (27) after melt is cooling and takes out die cast part.
CN201910227173.XA 2019-03-25 2019-03-25 A kind of melting low temperature solid solution heat treatment method of pack alloy Pending CN109763080A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110512100A (en) * 2019-09-06 2019-11-29 中北大学 A kind of method of smelting of V-N steel pack alloy
CN110541092A (en) * 2019-08-29 2019-12-06 金榀精密工业(苏州)有限公司 preparation method of high-wear-resistance aluminum alloy automobile part
CN112207247A (en) * 2020-09-23 2021-01-12 浙江茸创机械制造有限公司 Casting and heat treatment process of high-strength aluminum alloy
CN112553509A (en) * 2020-11-13 2021-03-26 泰州市天宇交通器材有限公司 Alloy casting process for power steering pump support

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110541092A (en) * 2019-08-29 2019-12-06 金榀精密工业(苏州)有限公司 preparation method of high-wear-resistance aluminum alloy automobile part
CN110512100A (en) * 2019-09-06 2019-11-29 中北大学 A kind of method of smelting of V-N steel pack alloy
CN112207247A (en) * 2020-09-23 2021-01-12 浙江茸创机械制造有限公司 Casting and heat treatment process of high-strength aluminum alloy
CN112553509A (en) * 2020-11-13 2021-03-26 泰州市天宇交通器材有限公司 Alloy casting process for power steering pump support

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