CN102172771A - Remelting heating process in semisolid thixotropic processing of aluminium alloy - Google Patents
Remelting heating process in semisolid thixotropic processing of aluminium alloy Download PDFInfo
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- CN102172771A CN102172771A CN2011100723878A CN201110072387A CN102172771A CN 102172771 A CN102172771 A CN 102172771A CN 2011100723878 A CN2011100723878 A CN 2011100723878A CN 201110072387 A CN201110072387 A CN 201110072387A CN 102172771 A CN102172771 A CN 102172771A
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Abstract
The invention relates to a remelting heating process in the semisolid thixotropic processing of an aluminium alloy, which is characterized in that the advantages of accurate temperature control and low energy consumption of a resistance heating mode and the advantages of high efficiency of an intermediate frequency heating mode are organically combined to be used in the remelting heating process in the semisolid thixotropic processing of an aluminium alloy; and the remelting heating process comprises three phases of solid state heating and thermal insulation, fast wind cooling and semisolid heating. The remelting heating process in the semisolid thixotropic processing of an aluminium alloy, disclosed in the invention, can ensure uniform temperature of each part of a semisolid blank of the aluminium alloy to be heated; and furthermore, the remelting heating process has the advantages of low energy consumption and high stability, can be matched with the rhythm of semisolid compression casting production or semisolid die forging production in real production, and is suitable to be used in large-scale chemical industry production.
Description
Technical field
The invention belongs to the aluminum alloy processing technology field, specially refer to the remelting heating process in a kind of aluminium alloy semi-solid thixotroping processing.
Background technology
The semisolid Metal Processing technology is between traditional solid-state process technology and a kind of novel processing method between the liquid process technology.By the technological process branch, the semisolid Metal Processing technology mainly can be divided into Semi-Solid Thixoforming processing and semi-solid rheological is processed two classes, and the most ripe at present, commercial Application mainly is the Semi-Solid Thixoforming process technology.The thixotroping process technology has that casting flaw is few, the porosity is low, is easy to shape, die life advantages of higher.These advantages make thixotroping processing compare at cost, aspect of performance with tradition methods of shaping such as forging, die casting all to have suitable competitive advantage.In addition, thixotroping process technology also is with a wide range of applications at the direct near-net forming of casting and forging, deforming alloy, the aspects such as casting character of the difficult casting alloy of improvement.
The thixotroping process technology can be divided into three processing steps: the 1) preparation of semi-solid blank; 2) remelting heating; 3) thixotroping processing (comprising thixotroping die forging and thixotroping die casting).Usually the requirement to semi-solid blank remelting heating process is: 1) the thixotroping blank of process remelting heating is inside and outside, upper and lower temperature difference should be even as far as possible, to avoid in follow-up thixotroping process owing to mobile difference causes phenomenons such as Solid-Liquid Separation, also can avoid simultaneously remelting heating back to produce defectives such as " resembling foot ", bring difficulty for the clamping carrying of thixotroping blank; Used heat time heating time should be short as far as possible when 2) remelting heating process equitemperature arrived the aluminum alloy materials solidus temperature, farthest avoiding the thixotroping blank in post bake process, to produce surface oxidation and primary phase crystal grain is too grown up, thereby the final performance of thixotroping workpiece is had a negative impact; 3) provide excellent microstructure basis for follow-up thixotroping processing.Therefore, can remelting be heated as the important process link that connects semi-solid blank preparation and thixotroping processing, finish remelting efficiently, cheaply and be heated as one of key factor that influences thixotroping process technology competitiveness.
The remelting heating process mainly adopts the mode of Frequency Induction Heating at present, this is because heating in medium frequency has and heats advantage fast and efficiently, but adopt the intermediate frequency processing mode that a lot of deficiencies are also arranged, big such as intermediate frequency process equipment energy consumption, reactive loss is bigger when especially heating aluminium alloy, cost increases when causing adopting thixotroping process technology manufactured parts, and competitiveness descends; Be complementary for rhythm of production during large-scale production with thixotroping die casting or thixotroping die forging, heating in medium frequency equipment often needs to dispose a plurality of heater coils, semi-solid blank need shift heating between each coil, therefore the heating in medium frequency equipment that is used for thixotroping processing is often huge, complicated, machine driving is also loaded down with trivial details unusually, and this causes the stabilization of equipment performance difference and invests huge.The deficiency of above-mentioned Frequency Induction Heating mode, what show when the big more semi-solid blank of heating dimensions is all the more obvious.
Summary of the invention
Deficiencies such as the energy consumption height that exists when solving heating in medium frequency equipment heating semi-solid-state blank, stabilization of equipment performance difference; patent of the present invention provides a kind of new remelting heating process; this technology can guarantee heated aluminium alloy semi-solid state blank, and temperature is even everywhere; and energy consumption is little, stability high; can be complementary with semisolid die casting or the semisolid die forging rhythm of production in the actual production, be suitable for extensive chemical industry and produce use.
For reaching the purpose of foregoing invention, the present invention by the following technical solutions.
Remelting heating process in a kind of aluminium alloy semi-solid thixotroping processing, implement by the remelting heater in the Semi-Solid Thixoforming processing, be characterized in: with resistance heated mode temperature control accurately, advantage that advantage of low energy consumption and heating in medium frequency mode efficient are high organically combines and is used for the remelting heating process that the aluminium alloy semi-solid thixotroping is processed, heat according to following processing step.
A, solid-state heat tracing stage: place resistance-heated furnace to heat, be incubated in batches aluminium alloy semi-solid state blank, the resistance-heated furnace design temperature is the aluminum alloy materials solidus temperature T than the need heating
LLow 5-20 ℃, by intelligent temperature control instrument control heating power, must guarantee the temperature departure in 3 ℃, be 30-90 minute heat time heating time.
B, quick air-cooled stage: will regularly take out in resistance-heated furnace according to the rhythm of production requirement of semisolid die casting or semisolid die forging through the semi-solid blank of resistance furnace heating, the semi-solid blank after the taking-up cools off 5-10 second fast through the 1-5KW blower fan.
C, semisolid heating period: will insert the heating in medium frequency coil through air-cooled semi-solid blank and heat, temperature required until semi-solid blank is heated to.
Remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, wherein according to the difference of semi-solid blank composition and follow-up thixotroping processing rhythm, the heating in medium frequency coil can be arranged 1-5.
Remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, wherein the power frequency of Frequency Induction Heating need be controlled at 300-600Hz, and each Medium frequency induction coil frequency is identical.
Remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, wherein in the Frequency Induction Heating internal coil diameter be the semi-solid blank diameter 1.1-2 doubly, loop length be semi-solid blank length 1.5-3 doubly.
Remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, wherein each Frequency Induction Heating coil dimension, the assorted number of heating copper tube, density degree etc. are identical.
Remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, but wherein the Frequency Induction Heating coil can vertically be placed also horizontal positioned.
The present invention makes it compared with prior art owing to adopted above technical scheme, has following tangible advantage and good effect.
1, processes under the equal rhythm of production condition in thixotroping, can loss-rate adopt the Frequency Induction Heating mode to reduce greatly merely.
2, made full use of that resistance heated mode energy consumption is low, homogeneous heating, the characteristics that can heat in batches, use it for solid-state heating period of semi-solid blank, not only reduced energy consumption but also can not influence tissue, the performance of semi-solid blank.
3, after the semi-solid blank resistance heated through quick air-cooled operation, the blank surface temperature reduces rapidly, thereby has effectively remedied follow-up Frequency Induction Heating operation because the deficiency of the blank surface temperature drift that causes of kelvin effect.
4, the semisolid heating period has been given full play to the high characteristics of the Frequency Induction Heating mode efficiency of heating surface, selects the power frequency scope heating of 300-600Hz simultaneously, thereby has guaranteed the uniformity of heating-up temperature.
5, process under the equal rhythm of production condition in thixotroping, the quantity of Frequency Induction Heating coil significantly reduces than the simple Frequency Induction Heating mode that adopts, thereby has simplified mechanical transmission mechanism greatly, and stabilization of equipment performance obviously improves.
Description of drawings
Fig. 1: the thixotroping heater in the aluminium alloy semi-solid thixotroping processing.
1. resistance-heated furnaces among the figure, 2. semi-solid blank, 3. thimble-bat, 4. blower fan, 5. base, 6. Frequency Induction Heating coil, 7. refractory material base, 8. cylinder, 9. operating desk.
The specific embodiment
Remelting heating process in the aluminium alloy semi-solid thixotroping processing of the present invention is implemented by the remelting heater in the Semi-Solid Thixoforming processing, and heating divides solid-state heat tracing, air-cooled, semisolid heating three phases carries out fast.
This remelting heater as shown in Figure 1.This device mainly is made up of resistance-heated furnace 1, blower fan 4 and Frequency Induction Heating coil 6 three parts, and this three part linearly is arranged in operating desk 9 tops.Resistance-heated furnace 1 burner hearth bottom is placed thimble-bat 3, and semi-solid blank 2 places on the thimble-bat 3; Take out from resistance furnace 1 through the semi-solid blank of resistance furnace 1 heating and to be placed on base 5 and to carry out air-cooledly fast, base 5 is positioned at blower fan 4 bottoms; Place in the vertical or bedroom of Frequency Induction Heating coil 6, and coil is by the copper pipe coiling, interior logical cooling water; Frequency Induction Heating coil 6 is promoted and can vertically be moved up and down by cylinder 8, and purpose is to be convenient to be positioned on the refractory material base 7 through air-cooled semi-solid blank fast heat.
Remelting heating process in the aluminium alloy semi-solid thixotroping processing of the present invention, power, the size that need select suitable resistance furnace power, size and Frequency Induction Heating coil according to the rhythm of production and the semi-solid blank of thixotroping processing, heat by following processing step then:
A, solid-state heat tracing stage: place resistance-heated furnace to heat, be incubated in batches aluminium alloy semi-solid state blank, the resistance-heated furnace design temperature is the aluminum alloy materials solidus temperature T than the need heating
LLow 5-20 ℃, by intelligent temperature control instrument control heating power, must guarantee the temperature departure in 3 ℃, be 30-90 minute heat time heating time;
B, quick air-cooled stage: will regularly take out in resistance-heated furnace according to the rhythm of production requirement of semisolid die casting or semisolid die forging through the semi-solid blank of resistance furnace heating, the semi-solid blank after the taking-up cools off 5-10 second fast through the 1-5KW blower fan;
C, semisolid heating period: will insert the heating in medium frequency coil through air-cooled semi-solid blank and heat, temperature required until semi-solid blank is heated to.
Embodiment:
A356 aluminium alloy semi-solid state blank size φ 70 * 90mm, resistance-heated furnace power is 50KW, the resistance-heated furnace inner cavity size is (length * wide * height): 1000 * 300 * 200mm, can place 56 semi-solid blanks in the resistance furnace at most simultaneously heats simultaneously, the resistance-heated furnace design temperature is 545 ℃, than low 10 ℃ of A356 aluminium alloy solidus temperature, 56 A356 aluminium alloy semi-solid state blank heating simultaneously in resistance-heated furnace, be 90 minutes heat time heating time.
After resistance-heated furnace arrives 90 minute heat time heating time, be positioned over the blower fan below every 60 seconds from semi-solid blank of resistance-heated furnace taking-up and cool off fast, power of fan 4KW, the air-cooled time is 5 seconds.
After the air-cooled end, the Frequency Induction Heating coil is by cylinder jack-up, to be positioned over through air-cooled semi-solid blank on the refractory material base at Frequency Induction Heating coil middle part, after semi-solid blank was put well, the Frequency Induction Heating coil descended, and begins semi-solid blank is heated, be 40 seconds heat time heating time, after arriving heat time heating time, the Frequency Induction Heating coil rises, and takes the semi-solid blank that heats away and carries out the semisolid casting forming; The internal diameter size of Frequency Induction Heating coil is 105mm, is 1.5 times of the semi-solid blank size, and the height of Frequency Induction Heating coil is 180mm, is 2 times of the semi-solid blank size, and the power frequency of Frequency Induction Heating is 500HZ, and power is 60KW; The final heating-up temperature of A356 aluminium alloy semi-solid state blank is 577 ± 3 ℃.
Heat according to above processing step, can guarantee to heat a semi-solid blank in per 40 seconds, be complementary with follow-up semisolid casting forming rhythm of production.The general power of remelting heater is 114KW, and adopts traditional Intermediate Frequency Induction Heating Equipment that is furnished with a plurality of heater coils to heat, and reach the same efficiency of heating surface, and power needs 300KW at least.
Claims (2)
1. the remelting heating process during an aluminium alloy semi-solid thixotroping is processed, implement by the remelting heater in the Semi-Solid Thixoforming processing, be characterized in: with resistance heated mode temperature control accurately, advantage that advantage of low energy consumption and heating in medium frequency mode efficient are high organically combines and is used for the remelting heating process that the aluminium alloy semi-solid thixotroping is processed, heat according to following processing step:
A, solid-state heat tracing stage: place resistance-heated furnace to heat, be incubated in batches aluminium alloy semi-solid state blank, the resistance-heated furnace design temperature is the aluminum alloy materials solidus temperature T than the need heating
LLow 5-20 ℃, by intelligent temperature control instrument control heating power, must guarantee the temperature departure in 3 ℃, be 30-90 minute heat time heating time;
B, quick air-cooled stage: will regularly take out in resistance-heated furnace according to the rhythm of production requirement of semisolid die casting or semisolid die forging through the semi-solid blank of resistance furnace heating, the semi-solid blank after the taking-up cools off 5-10 second fast through the 1-5KW blower fan;
C, semisolid heating period: will insert the heating in medium frequency coil through air-cooled semi-solid blank and heat, temperature required until semi-solid blank is heated to.
2. the remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, wherein according to the difference of semi-solid blank composition and follow-up thixotroping processing rhythm, the heating in medium frequency coil can be arranged 1-5;
3, the remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, wherein the power frequency of Frequency Induction Heating need be controlled at 300-600Hz, and each Medium frequency induction coil frequency is identical;
4, the remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, wherein the Frequency Induction Heating internal coil diameter be the semi-solid blank diameter 1.1-2 doubly, loop length be semi-solid blank length 1.5-3 doubly;
5, the remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, wherein each Frequency Induction Heating coil dimension, the assorted number of heating copper tube, density degree etc. are identical;
6, the remelting heating process in the above-mentioned aluminium alloy semi-solid thixotroping processing, but wherein semisolid in the heating period Frequency Induction Heating coil can vertically place also horizontal positioned.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028733A (en) * | 2014-05-14 | 2014-09-10 | 西北工业大学 | Adjusting-controlling method and device for organizing of Ti-Zr-Nb-Cu-Be system amorphous composite materials |
| CN105081166A (en) * | 2015-09-21 | 2015-11-25 | 哈尔滨工业大学 | Multi-layer accumulated die-forging forming technical method for metal matrix composite material electronic packaged parts |
| CN107199303A (en) * | 2017-04-13 | 2017-09-26 | 中北大学 | The integrated contour forging technique of semisolid filling-plastic deformation |
| CN107199304A (en) * | 2017-04-13 | 2017-09-26 | 中北大学 | SiCp/2A50 creeper tread Part Produced by Rheological Die Forging forming technologies |
| CN107214278A (en) * | 2017-04-13 | 2017-09-29 | 中北大学 | Prepare composite-rheological molding creeper tread technique |
| 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 |
| CN113601103A (en) * | 2021-06-25 | 2021-11-05 | 上海航天精密机械研究所 | Method for repairing defects of aluminum and magnesium alloy castings |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104028733A (en) * | 2014-05-14 | 2014-09-10 | 西北工业大学 | Adjusting-controlling method and device for organizing of Ti-Zr-Nb-Cu-Be system amorphous composite materials |
| CN105081166A (en) * | 2015-09-21 | 2015-11-25 | 哈尔滨工业大学 | Multi-layer accumulated die-forging forming technical method for metal matrix composite material electronic packaged parts |
| CN107199303A (en) * | 2017-04-13 | 2017-09-26 | 中北大学 | The integrated contour forging technique of semisolid filling-plastic deformation |
| CN107199304A (en) * | 2017-04-13 | 2017-09-26 | 中北大学 | SiCp/2A50 creeper tread Part Produced by Rheological Die Forging forming technologies |
| CN107214278A (en) * | 2017-04-13 | 2017-09-29 | 中北大学 | Prepare composite-rheological molding creeper tread technique |
| 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 |
| CN113601103A (en) * | 2021-06-25 | 2021-11-05 | 上海航天精密机械研究所 | Method for repairing defects of aluminum and magnesium alloy castings |
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