CN1532008A - Secondary heating process in aluminium alloy semi solid forming technology - Google Patents
Secondary heating process in aluminium alloy semi solid forming technology Download PDFInfo
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- CN1532008A CN1532008A CNA031159168A CN03115916A CN1532008A CN 1532008 A CN1532008 A CN 1532008A CN A031159168 A CNA031159168 A CN A031159168A CN 03115916 A CN03115916 A CN 03115916A CN 1532008 A CN1532008 A CN 1532008A
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Abstract
The twice heating process in aluminum alloy semi-solid forming technology is performed through multiple coil intermittent sectional inducing heating with a twice heating apparatus. The twice heating process includes a fast heating phase and a slow heating phase, can obtain small inner and outer temperature difference of the blank and homogeneous temperature field, and is favorable to semi-solid formation. The present invention can meet the requirements of fast temperature raise, accurate temperature control, homogeneous temperature distribution, easy automatic control and less oxidation; and is especially suitable for semi-solid formation of low smelting point non-ferrous metals, such as aluminum alloy and magnesium alloy.
Description
Technical field
The present invention relates to a kind of metallurgical technology technology, relate in particular to the post bake technology in a kind of aluminium alloy semi-solid forming technique.
Background technology
The semisolid forming technique has merged the strong point of casting and Forging Technology, is a kind of new type of metal material machine-shaping technology, also is one of current China industrialization of new high-technology key project of first developing.This technology can be used for processing the part near net shape, has compared significant advantage with other technology.For example, can improve die life, energy savings has higher productivity ratio, and operation is few, the stock utilization height, and product physical dimension precision height, dense internal organization, defective is few, and the strong plasticity that can improve part by a relatively large margin can wait.This is a kind of rising new technology that broad applicability, big promotional value are arranged.Substitute compression casting and common die forging with the semisolid forming technique, simplified production process, improved product quality and qualification rate, huge potentiality to be exploited is arranged, the market competitiveness is very strong.The semisolid forming technique is mainly used in low-smelting-point non-ferrous alloy, for example aluminium alloy, magnesium alloy etc.
At present, in the semisolid forming technique, extensively adopt the Semi-Solid Thixoforming forming technique.The Semi-Solid Thixoforming forming technique has three critical processes, i.e. the post bake of the preparation of semi-solid blank, blank and Semi-Solid Thixoforming moulding.The Semi-Solid Thixoforming moulding process is to the heating-up temperature of the post bake technology of blank and distribute and require quite harshly, promptly requires programming rate fast, and temperature control accurately is evenly distributed, and process is easy to automatic control, also requires oxidation few in addition.Therefore, designing a kind of rational post bake technology is at present in the numerous scientific and technical personnel's care in this field and the key subjects of research.
The mode of heating of the post bake technology of semi-solid blank can adopt eddy-current heating or resistance furnace heating.The resistance furnace heating is compared with eddy-current heating, and its heat time heating time is long, and temperature deviation is big, the easy oxidation of blank, and effect is relatively poor.And under reasonable process conditions, it is fast that eddy-current heating can satisfy programming rate, the temperature precise control, and uniformity of temperature profile, the requirement that oxidation waits less, and be easy to automatic control.Induction heating apparatus generally comprises a blank carrying mechanism and a heating arrangements.Induction heating method at present commonly used is the continuous heating means of single electric furnace, and the shortcoming of the continuous heating means of this single electric furnace is, the internal-external temperature difference of blank is big, and the temperature field is inhomogeneous, and is very big to the structure property influence of semi-solid-state shaping spare.Therefore still can not satisfy fast, the harsh conditions such as temperature control accurate, uniformity of temperature profile of post bake technology programming rate of Semi-Solid Thixoforming moulding process requirement blank fully.
Summary of the invention
Purpose of the present invention is to provide the multi-thread circle batch (-type) of a kind of employing segmentation eddy-current heating, and the internal-external temperature difference that is heated blank is little, the post bake technology in the uniform aluminium alloy semi-solid forming technique in temperature field.
The object of the present invention is achieved like this, post bake technology in a kind of semi-solid state forming technique, implement by the second heating apparatus in the semi-solid state forming technique, be characterized in: the size of the alloy blank of post bake chooses adaptive heater coil at first as required, secondly will need the blank of post bake to be placed on the thermal insulating seat of reinforced station, heat by following processing step then:
A, rapid heat-up stage: blank is placed a Fast Heating station, carry out Fast Heating 1～5 time; Each Fast Heating comprises the steps: that a Fast Heating coil is entangled blank to be heated, the power frequency and the surface of the work power density of control heater coil, 10-105 is after second in heating, make heater coil break away from blank, stop 5-30 second, or finish this rapid heat-up stage or enter Fast Heating station next time again;
B, heating period at a slow speed: blank is placed a heating station at a slow speed, carry out 1～5 heating at a slow speed; At every turn at a slow speed heating comprise the steps: with one at a slow speed heater coil entangle blank and heat, the power frequency and the surface of the work power density of control heater coil, 10-105 is after second in heating, make heater coil break away from blank, stop 5-30 second, or finish this heating period or enter next time heating station at a slow speed more at a slow speed;
C, taking-up have been heated to the blank of required semi-solid temperature scope, finish the post bake of blank.
Post bake technology in the above-mentioned semi-solid state forming technique, wherein, the adaptive scope of described heater coil and blank is: the diameter of blank is 0.4-0.85 a times of internal coil diameter, the height of blank is 0.4-0.95 a times of coil height.
Post bake technology in the above-mentioned semi-solid state forming technique, wherein: described power frequency is controlled at 640-1000HZ, adopts identical power frequency in each heating steps of same blank.
Post bake technology in the above-mentioned semi-solid state forming technique, wherein: described surface of the work power density is controlled at 0.9-8W/mm in rapid heat-up stage
2, in each heating steps of rapid heat-up stage of same blank, the surface of the work power density of being controlled is identical.
Post bake technology in the above-mentioned semi-solid state forming technique, wherein: described surface of the work power density is in that the heating period is controlled at 0.3-6W/mm at a slow speed
2, in each heating steps of heating period at a slow speed of same blank, the surface of the work power density of being controlled is identical.
The present invention makes it compared with prior art owing to adopted above technical scheme, has following tangible advantage and good effect:
1, owing to adopted many electric furnaces batch (-type) segmentation induction heating technology, the internal-external temperature difference that can obtain blank is little, and the temperature field effect of uniform is very favourable to semi-solid-state shaping.Can satisfy that programming rate is fast, temperature control accurately, uniformity of temperature profile, oxidation be few, be easy to the requirement of control automatically.
2, because power frequency has been selected intermediate frequency 640-1000HZ, the maximum temperature difference of blank is controlled at about 6 ℃, has taken into account the uniformity of firing rate, electromagnetic stirring force and blank temperature simultaneously again.
3, owing to adopted 0.4-0.85 that the heater coil that is complementary with the blank size, the diameter of blank equal the heater coil internal diameter doubly; The 0.4-0.95 that the height of blank equals the heater coil height doubly, can obtain that programming rate is fast, temperature control accurately, uniformity of temperature profile add thermal effect.
Description of drawings
Concrete characteristic performance of the present invention is further described by following embodiment and accompanying drawing thereof.
The schematic diagram of the second heating apparatus that Fig. 1 is adopted for the post bake technology in the semi-solid state forming technique of the present invention.
The specific embodiment
Post bake technology in the aluminium alloy semi-solid forming technique of the present invention, implement by the second heating apparatus in the semi-solid state forming technique, be many electric furnaces batch (-type) segmentation induction heating technology, branch Fast Heating and heat two stages at a slow speed and heat, rapid heat-up stage and the heating period is made up of 1-5 heating station respectively at a slow speed.This second heating apparatus as shown in Figure 1, comprise a heating arrangements 11 and a blank carrying mechanism 12, heating arrangements 11 comprises an elevating mechanism moving up and down 111 and is connected Fast Heating coil 112 and heater coil 114 at a slow speed on this elevating mechanism 111, described Fast Heating coil 112 and at a slow speed heater coil 114 respectively be made as 1～5, can be according to the size of heating blank, the height of the length of heat time heating time and the surperficial power of selection is determined the Fast Heating and the number of times of heating at a slow speed, and designs the Fast Heating coil of this device and the number of heater coil at a slow speed.Blank carrying mechanism 12 comprises a rotating disk that can horizontally rotate 121 and is arranged on a plurality of thermal insulating seats 122 of this rotating disk periphery.It among Fig. 1 a kind of situation of embodiment device, this embodiment has selected two Fast Heating stations and two heating station at a slow speed, comprising: a plurality of thermal insulating seats form reinforced station 1221, the first Fast Heating station 1222, the second Fast Heating station 1223, first heating station 1224, second heating station 1225 and get material station 1226 at a slow speed at a slow speed in proper order.A plurality of coils are identical with the spacing that a plurality of thermal insulating seats are provided with, and a plurality of coils are identical with the number that a plurality of heating stations are provided with, and when heating arrangements descended, the first Fast Heating coil, 112 edges were enclosed within on the first Fast Heating station 1222; The second Fast Heating coil, 113 edges are enclosed within on the second Fast Heating station 1223; First at a slow speed heater coil 114 edge be enclosed within first at a slow speed on the heating station 1224; Second at a slow speed heater coil 115 edge be enclosed within second at a slow speed on the heating station 1225.
Please continue referring to Fig. 1, post bake technology in the semi-solid state forming technique of the present invention, the size of the alloy blank of post bake chooses adaptive heater coil at first as required, the diameter of control blank equals 0.4-0.85 times of internal coil diameter, and the height of blank equals 0.4-0.95 times of coil height; Secondly will need the blank of post bake to be placed on the thermal insulating seat of reinforced station, heat by following processing step then:
A, rapid heat-up stage: blank is placed a Fast Heating station, carry out Fast Heating 1～5 time; Each Fast Heating comprises the steps: that a Fast Heating coil is entangled blank to be heated, the power frequency and the surface of the work power density of control heater coil, 10-105 is after second in heating, make heater coil break away from blank, stop 5-30 second, or finish this rapid heat-up stage or enter Fast Heating station next time again;
B, heating period at a slow speed: blank is placed a heating station at a slow speed, carry out 1～5 heating at a slow speed; At every turn at a slow speed heating comprise the steps: with one at a slow speed heater coil entangle blank and heat, the power frequency and the surface of the work power density of control heater coil, 10-105 is after second in heating, make heater coil break away from blank, stop 5-30 second, or finish this heating period or enter next time heating station at a slow speed more at a slow speed;
C, the heating period makes blank finally be heated to required semi-solid temperature scope after finishing at a slow speed.Take out the blank that has been heated to required semi-solid temperature scope, finish the post bake of blank.
In each heating steps of same blank, adopt identical power frequency.
In the rapid heating step of same blank, the surface of the work power density of control is identical; The surface of the work power density of controlling in the heating steps at a slow speed is also identical.
Further specify processing step of the present invention below in conjunction with embodiment.
Embodiment 1
A356 aluminium-silicon alloys billet size is φ 100*200mm, and the selection internal diameter is 120mm, highly is the coil of 250mm; This moment, blank was 0.83 with the diameter ratio of heater coil, and aspect ratio is 0.8.
A356 aluminium-silicon alloys blank is placed on the thermal insulating seat of reinforced station on the rotating disk;
Rotary turnplate places the first Fast Heating station with blank, and the decline elevating mechanism makes the first Fast Heating coil big envelope live blank, and the control power frequency is 960HZ, and the surface of the work power density is 0.95W/mm
2, heated for 105 seconds;
The rising elevating mechanism makes heater coil break away from blank, stops for 15 seconds, then blank is placed the second Fast Heating station; Fast Heating is carried out twice.Step is with for the first time identical.
Rotary turnplate places first heating station at a slow speed with blank, and the decline elevating mechanism makes at a slow speed the heater coil big envelope live blank, and the control power frequency is 960HZ, and the surface of the work power density is 0.4W/mm
2, heated for 105 seconds;
The rising elevating mechanism makes heater coil break away from blank, stops for 15 seconds, then blank is placed second heating station at a slow speed; Heating station carries out twice at a slow speed, and step is with for the first time identical.
Heating period makes A356 aluminium-silicon alloys blank finally be heated to required semi-solid temperature scope after finishing at a slow speed, and temperature reaches 586 ± 3 ℃.
The rising elevating mechanism makes coil break away from blank, and rotary turnplate is taken out blank to getting the material station, sends into die casting machine and carries out semi-solid die casting.
Embodiment 2
A356 aluminium-silicon alloys billet size is φ 80*160mm, and the selection internal diameter is 120mm, highly is the coil of 250mm; This moment, blank was 0.67 with the diameter ratio of heater coil, and aspect ratio is 0.64.
A356 aluminium-silicon alloys blank is placed on the thermal insulating seat of reinforced station on the rotating disk;
Rotary turnplate places the first Fast Heating station with blank, and the decline elevating mechanism makes the first Fast Heating coil big envelope live blank, and the control power frequency is 1000HZ, and the surface of the work power density is 2W/mm
2, heated for 30 seconds;
The rising elevating mechanism makes heater coil break away from blank, stops for 20 seconds, enters the second Fast Heating station then, and step is with for the first time identical;
Present embodiment Fast Heating station carries out three times, and step is with for the first time identical.
Rotary turnplate places first heating station at a slow speed with blank, and the decline elevating mechanism makes at a slow speed the heater coil big envelope live blank, and the control power frequency is 1000HZ, and the surface of the work power density is 1.4W/mm
2, heated for 30 seconds;
The rising elevating mechanism makes heater coil break away from blank, stops for 20 seconds, enters second heating station at a slow speed then, and step is identical with the first time;
Present embodiment heating station at a slow speed carries out three times, and step is with for the first time identical.
Through these three times fast and at a slow speed after the heating, the temperature of A356 aluminium-silicon alloys blank reaches 586 ± 3 ℃.
The elevating mechanism that rises then makes coil break away from blank, and rotary turnplate is taken out blank to getting the material station, sends into die casting machine and carries out semi-solid die casting.
Embodiment 3
A356 aluminium-silicon alloys billet size is φ 60*120mm, and the selection internal diameter is 120mm, highly is the heater coil of 250mm; This moment, blank was 0.5 with the diameter ratio of heater coil, and aspect ratio is 0.48.
A356 aluminium-silicon alloys blank is placed on the thermal insulating seat of reinforced station on the rotating disk;
Rotary turnplate places the first Fast Heating station with blank, and the decline elevating mechanism makes the first Fast Heating coil big envelope live blank, and the control power frequency is 640HZ, and the surface of the work power density is 3.32W/mm
2, heated for 27 seconds;
The rising elevating mechanism makes heater coil break away from blank, stops for 10 seconds, enters the second Fast Heating station then;
Present embodiment Fast Heating station carries out twice, and step is with for the first time identical.
Rotary turnplate places first heating station at a slow speed with blank, the decline elevating mechanism make first at a slow speed the heater coil big envelope live blank, the control power frequency is 640HZ, the surface of the work power density is 2W/mm
2, heated for 27 seconds;
The rising elevating mechanism makes heater coil break away from blank, stops for 10 seconds, enters second heating station at a slow speed then;
Present embodiment heating station at a slow speed carries out twice, and step is with for the first time identical.
Through this twice fast and at a slow speed after the heating, the temperature of A356 aluminium-silicon alloys blank reaches 586 ± 3 ℃.
The rising elevating mechanism makes coil break away from blank, and rotary turnplate is taken out blank to getting the material station, sends into die casting machine and carries out semi-solid die casting.
Embodiment 4
A356 aluminium-silicon alloys billet size is φ 50*100mm, and the selection internal diameter is 120mm, highly is the coil of 250mm; This moment, blank was 0.42 with the diameter ratio of heater coil, and aspect ratio is 0.4.
A356 aluminium-silicon alloys blank is placed on the thermal insulating seat of reinforced station on the rotating disk;
Rotary turnplate places the first Fast Heating station with blank, and the decline elevating mechanism makes the first Fast Heating coil big envelope live blank, and the control power frequency is 640HZ, and the surface of the work power density is 7.17W/mm
2, heated for 10 seconds;
The rising elevating mechanism makes heater coil break away from blank, stops for 5 seconds, enters second heating station then;
Present embodiment Fast Heating station carries out four times, and step is with for the first time identical.
Rotary turnplate places first heating station at a slow speed with blank, the decline elevating mechanism make first at a slow speed the heater coil big envelope live blank, the control power frequency is 640HZ, the surface of the work power density is 3W/mm
2, heated for 10 seconds;
The rising elevating mechanism makes heater coil break away from blank, stops for 5 seconds; Enter second heating station at a slow speed then;
Present embodiment heating station at a slow speed carries out four times, and step is with for the first time identical.
Through these four times fast and at a slow speed after the heating, the temperature of A356 aluminium-silicon alloys blank reaches 586 ± 3 ℃.
The rising elevating mechanism makes heater coil break away from blank, and rotary turnplate is taken out blank to getting the material station, sends into die casting machine and carries out semi-solid die casting.
Post bake technology of the present invention, the internal-external temperature difference that can obtain blank is little, the effect of uniform temperature fields, and is right Semi-solid-state shaping is very favourable. Can satisfy that programming rate is fast, temperature control accurately, uniformity of temperature profile, be easy to automatic control System, the requirement that oxidation is few. Be specially adapted to the semi-solid-state shaping of low melting point non-ferrous metal such as aluminium alloy, magnesium alloy.
Claims (5)
1, the post bake technology in a kind of semi-solid state forming technique is implemented by the second heating apparatus in the semi-solid state forming technique, it is characterized in that:
The size of the alloy blank of post bake chooses adaptive heater coil at first as required, secondly will need the blank of post bake to be placed on the thermal insulating seat of reinforced station, heats by following processing step then:
A, rapid heat-up stage: blank is placed a Fast Heating station, carry out Fast Heating 1～5 time; Each Fast Heating comprises the steps: that a Fast Heating coil is entangled blank to be heated, the power frequency and the surface of the work power density of control heater coil, 10-105 is after second in heating, make heater coil break away from blank, stop 5-30 second, or finish this rapid heat-up stage or enter Fast Heating station next time again;
B, heating period at a slow speed: blank is placed a heating station at a slow speed, carry out 1～5 heating at a slow speed; At every turn at a slow speed heating comprise the steps: with one at a slow speed heater coil entangle blank and heat, the power frequency and the surface of the work power density of control heater coil, 10-105 is after second in heating, make heater coil break away from blank, stop 5-30 second, or finish this heating period or enter next time heating station at a slow speed more at a slow speed;
C, the heating period makes blank finally be heated to required semi-solid temperature scope after finishing at a slow speed.Take out the blank that has been heated to required semi-solid temperature scope, finish the post bake of blank.
2, the post bake technology in the semi-solid state forming technique according to claim 1, it is characterized in that: the adaptive scope of described heater coil and blank is: the diameter of blank equals 0.4-0.85 times of internal coil diameter, and the height of blank equals 0.4-0.95 times of coil height.
3, the post bake technology in the semi-solid state forming technique according to claim 1, it is characterized in that: described power frequency is controlled at 640-1000HZ, adopts identical power frequency in each heating steps of same blank.
4, the post bake technology in the semi-solid state forming technique according to claim 1 is characterized in that: described surface of the work power density is controlled at 0.9-8W/mm in rapid heat-up stage
2, in each heating steps of rapid heat-up stage of same blank, the surface of the work power density of being controlled is identical.
5, the post bake technology in the semi-solid state forming technique according to claim 1 is characterized in that: described surface of the work power density is in that the heating period is controlled at 0.3-6W/mm at a slow speed
2, in each heating steps of heating period at a slow speed of same blank, the surface of the work power density of being controlled is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03115916 CN1265912C (en) | 2003-03-21 | 2003-03-21 | Secondary heating process in aluminium alloy semi solid forming technology |
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| CN 03115916 CN1265912C (en) | 2003-03-21 | 2003-03-21 | Secondary heating process in aluminium alloy semi solid forming technology |
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| CN1532008A true CN1532008A (en) | 2004-09-29 |
| CN1265912C CN1265912C (en) | 2006-07-26 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813953A (en) * | 2010-04-27 | 2010-08-25 | 浙江大学 | Aluminum alloy semisolid remelting and heating control method and device based on infrared temperature measurement |
| CN103857088A (en) * | 2013-10-29 | 2014-06-11 | 北京有色金属研究总院 | Full-automatic continuous type secondary heating device for semisolid metal blanks |
| CN104213058A (en) * | 2014-05-29 | 2014-12-17 | 华东理工大学 | Preparation method suitable for secondary heating of semisolid thixotropy deformation aluminum alloy |
| CN107401922A (en) * | 2017-09-06 | 2017-11-28 | 苏州慧驰轻合金精密成型科技有限公司 | Blank heating device in aluminium alloy semi-solid thixotropic forming |
| CN107567123A (en) * | 2017-07-10 | 2018-01-09 | 济南日业自动化科技有限公司 | A kind of piston automatic heating device and heating means |
| CN107900276A (en) * | 2017-12-12 | 2018-04-13 | 江苏珀然股份有限公司 | A kind of processing method of wheel hub |
| CN109530635A (en) * | 2019-01-16 | 2019-03-29 | 南方科技大学 | The method for preparing metal or alloy semi solid slurry and non-aluminum silicon systems aluminium alloy semi-solid slurry |
| CN113828647A (en) * | 2021-09-02 | 2021-12-24 | 昆明理工大学 | Method and device for gradient heating thixoextrusion forming of conical nut part |
-
2003
- 2003-03-21 CN CN 03115916 patent/CN1265912C/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813953A (en) * | 2010-04-27 | 2010-08-25 | 浙江大学 | Aluminum alloy semisolid remelting and heating control method and device based on infrared temperature measurement |
| CN103857088A (en) * | 2013-10-29 | 2014-06-11 | 北京有色金属研究总院 | Full-automatic continuous type secondary heating device for semisolid metal blanks |
| CN103857088B (en) * | 2013-10-29 | 2015-11-18 | 北京有色金属研究总院 | Semisolid metal blank Full-automatic continuous second heating apparatus |
| CN104213058A (en) * | 2014-05-29 | 2014-12-17 | 华东理工大学 | Preparation method suitable for secondary heating of semisolid thixotropy deformation aluminum alloy |
| CN107567123A (en) * | 2017-07-10 | 2018-01-09 | 济南日业自动化科技有限公司 | A kind of piston automatic heating device and heating means |
| CN107401922A (en) * | 2017-09-06 | 2017-11-28 | 苏州慧驰轻合金精密成型科技有限公司 | Blank heating device in aluminium alloy semi-solid thixotropic forming |
| CN107900276A (en) * | 2017-12-12 | 2018-04-13 | 江苏珀然股份有限公司 | A kind of processing method of wheel hub |
| CN109530635A (en) * | 2019-01-16 | 2019-03-29 | 南方科技大学 | The method for preparing metal or alloy semi solid slurry and non-aluminum silicon systems aluminium alloy semi-solid slurry |
| CN113828647A (en) * | 2021-09-02 | 2021-12-24 | 昆明理工大学 | Method and device for gradient heating thixoextrusion forming of conical nut part |
| CN113828647B (en) * | 2021-09-02 | 2024-01-30 | 昆明理工大学 | Gradient heating thixotropic extrusion forming method and device for conical nut part |
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| CN1265912C (en) | 2006-07-26 |
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