CN104694857A - Method for controlling deformation due to heat treatment of cabin segment of cast aluminum alloy having thin wall with air intake duct structure - Google Patents
Method for controlling deformation due to heat treatment of cabin segment of cast aluminum alloy having thin wall with air intake duct structure Download PDFInfo
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- CN104694857A CN104694857A CN201310652322.XA CN201310652322A CN104694857A CN 104694857 A CN104694857 A CN 104694857A CN 201310652322 A CN201310652322 A CN 201310652322A CN 104694857 A CN104694857 A CN 104694857A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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Abstract
The invention discloses a method for controlling deformation due to heat treatment of cabin segment of a cast aluminum alloy having a thin wall with an air intake duct structure, which comprises the following steps: 1)tool installation: arranging a front blocking plate and a rear blocking plate on a workpiece; 2)furnace treatment; 3)heating and heat treatment in furnace: selecting the furnace with furnace temperature being less than 300 DEG C, heating to 530 DEG C by speed of 80 DEG C/h, insulating for 0.2 hours, heating to 540 DEG C by speed of 0.5 DEG C/min; 4)solid solution treatment; 5)sizing treatment: sizing the ovality of large circle of the workpiece, then sizing the position offset of an air intake duct; and 6)aging treatment. According to the inventing, charging at low temperature and heating by phases are employed, thermal stress due to heating of a complex member with a thick wall having large difference is reduced, and deformation can be reduced. By arranging the front blocking plate and the rear blocking plate, deformation can be controlled, structure is simple, operation is easy, and deformation control purpose can be reached.
Description
Technical field
The invention belongs to cast aluminium alloy Field of Heat-treatment, relate to a kind of thin-walled inlets structure cast aluminium alloy cabin section method for controlling heat treatment deformation, it is applicable to large thin-wall cast aluminium alloy class part.
Background technology
Cast aluminium alloy is because having excellent use properties, and can be shaped complex component, and cost is low, very extensive in field application such as aerospace, track traffic, weaponrys.Wherein cast aluminium alloy cargo tank structure is comparatively complicated, and for tank section, its complexity is maximum, is on the one hand to carry oily rate to require to improve, and makes volume of fuel tank need constantly to increase; On the other hand, compact construction degree is more and more higher, in order to installing device, fuel tank position is expressed to irregular position.Therefore, the tank section originally occurred with regular cabin bodily form formula have now becomes the complex construction that " plug hole " is settled, especially for the fuel tank of the thin wall inlets structure of wall thickness 2-4mm, structure is more complicated, fuel reserve tank is imperfect round structure, and uptake oral area and fuel reserve tank center exist skew again.The raising of cast properties need reach requirement by heat treated solid solution strengthening effect, and heat treatment process can produce larger distortion again simultaneously.How to reduce the distortion that complicated cast aluminium alloy cabin section heat treatment process produces, accurately control the school shape after solution treatment, have great importance.
Summary of the invention
The object of this invention is to provide a kind of thin-walled inlets structure cast aluminium alloy cabin section method for controlling heat treatment deformation, the method is irregular for cast shape, wall thickness is thinner, the feature that inner chamber is not processed, effectively can control the distortion that the section thermal treatment of cast aluminium alloy cabin produces, meet follow-up mach requirement, performance index reach design requirements.
Technical scheme of the present invention is: a kind of thin-walled inlets structure cast aluminium alloy cabin section method for controlling heat treatment deformation, comprises the steps:
The first step mounting tool: stifled dish before and after installing on workpiece, front stifled dish is positioned at workpiece great circle leading section, and rear stifled dish is positioned at workpiece great circle rearward end;
Second steps into stove process: stove is put into downward vertically in workpiece front end;
Intensification thermal treatment in 3rd step stove: select charging temperature to be less than 300 DEG C, rise to 530 DEG C with the speed of 80 DEG C/h, insulation 0.2h, rises to 540 DEG C with the heat-up rate of 0.5 DEG C/min;
4th step solution treatment: workpiece is at 540 DEG C of insulation 14h, and then enter water rapidly with the transport velocity being not more than 10s, water temperature requires 50-60 DEG C, and workpiece stops 5min in water;
Front and back on workpiece are blocked up dish and are taken off, the ovality of calibration of workpieces great circle by the 5th step school shape process, then correct the position skew of uptake.
6th step ageing treatment: stifled dish before and after reinstalling on workpiece, workpiece natural aging 8 hours laggard row artificial agings 7.5 hours in atmosphere.
Described artificially aged temperature is 155 DEG C ± 5 DEG C.
Described 5th step school shape process completes after 1 hour after workpiece water outlet.
In the shape process of described school, panel beating mode is adopted to correct great circle ovality.
In the process of described school shape, by the great circle of workpiece as benchmark, great circle is fixed, adopts hydraulic efficiency plant to correct the skew at center between uptake part and great circle.
The mode of described fixing great circle adopts the clip be fixed on a platform to be fixed.
The stifled dish in described front and back has gradient 1.5-2mm towards workpiece lumen direction.
Beneficial effect of the present invention:
1) adopt low temperature to enter stove, the heating process heated stage by stage, reduce the thermal stresses that the larger complex component intensification of wall thickness great disparity produces, reduce the generation of distortion.
2) define the time of quenching transfer and the requirement of water temperature, be conducive to the binding site that workpiece reaches superior performance and minimal deformation the best.
3) adopt front-end and back-end to install the method for stifled dish, relative to particular manufacturing craft controlling distortion, structure is simple, and easy handling, can reach the object of controlling distortion.
4) by grasping the rule of workpiece deformation, adopting great circle stationary installation and hydraulic efficiency plant, accurate school shape can be carried out to the skew of uptake portion.
5) Stages of Aging whole process keeps the constraint of frock, reasonable processing parameters, effectively controls the distortion that complex component Stages of Aging stress relaxation produces.
Accompanying drawing explanation
Fig. 1 is the structural representation of workpiece in embodiment;
Fig. 2 is the side-view of Fig. 1;
Fig. 3 is the front stifled dish structural representation of workpiece in embodiment;
Fig. 4 is the A-A direction view of Fig. 3;
Fig. 5 is rear stifled dish structural representation;
Fig. 6 is that workpiece enters stove putting position figure;
Fig. 7 is workpieces corrector schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, most preferred embodiment of the present invention is described in further detail.
For thin-walled inlets structure cast aluminium alloy cabin section Deformation control, its geomery is shown in Fig. 1, and material is ZL114A, and resin bonded sand mould is cast, and foundry goods overall length is 1049mm, and cross section maximum diameter is 524mm.Tenuity thickness is about 8mm, and crust size is removed in machining, and Excircle machining is to φ 514mm, and wall thickness requires to be greater than 2.5mm.Uptake off center position is not more than 1mm.Performance σ is met with stove bar
b>=320MPa, δ
5the requirement of>=8%.
Embodiment is undertaken by following processing step: the first step mounting tool, and as depicted in figs. 1 and 2: workpiece 100 great circle front end is stifled dish 1 before installing, rear end is stifled dish 2 after installing, and as shown in Figure 3 and Figure 4, the structure of rear stifled dish 2 as shown in Figure 5 for the structure of front stifled dish 1.Second step is determined into stove mode: workpiece 100 vertical pendulum puts into stove, and thermal treatment adopts and takes out end formula aluminium alloy quenching furnace, enters stove mode as shown in Figure 6, and front end lets droop straight stove.3rd step-up thermophase: select charging temperature to be less than 300 DEG C, such as 290 DEG C, rise to 530 DEG C with the speed of 80 DEG C/h, insulation 0.2h(h is hour).540 DEG C are risen to the heat-up rate of 0.5 DEG C/min.The 4th step solid solution stage: workpiece 100 is at 540 DEG C of insulation 14h, and then enter water rapidly with the transport velocity being not more than 10s, water temperature requires 50-60 DEG C.Workpiece 100 stops 5min in water.5th step school shape: utilize the good feature of plasticity after workpiece solution treatment, workpiece 100 is corrected shape.A () measures diameter 524mm great circle bus linearity with guiding ruler and clearance gauge, do not allow more than 2mm projection, exceed rear school shape, school shape at workpiece boss, uses hammer hammering with plank pad, i.e. panel beating mode.B large for workpiece 100 circular portion is placed in school shape frock 3 (as shown in Figure 7) by (), school shape frock 3 comprises a platform 35, and platform 35 is provided with clip 1 and clip 2 32, and platform is also provided with hydraulic efficiency plant 33.With the clip 1 in school shape frock 3 and clip 2 32 by great circle partial fixing, should be noted during fixation workpiece that the direction of workpiece 100 is to ensure that uptake is to colonel's shape, under hydraulic efficiency plant 33 is placed in workpiece air inlet road junction, hydraulic efficiency plant 33 is placed with circular arc cushion block 34, pressurization makes circular arc cushion block 34 contact with uptake outer rim; According to the up amount that uptake needs, continue pressurization up, pressurize (10-15) s, then slowly release, after uptake resilience is stable, measure actual uplink amount, until deviation is less than 1mm.5th step school shape requires to complete in 1h.6th step timeliness: reinstall front stifled dish 1 and rear stifled dish 2, workpiece 100 natural aging 8 hours in atmosphere, is then transferred to baking oven immediately and carries out artificial aging, oven temperature uniformity requirement ± 5 DEG C, timeliness requires temperature 155 DEG C ± 5 DEG C, soaking time 7.5h, goes out air cooling after baking oven.Remove frock, measure variable quantity and the bar performance of thermal treatment anteroposterior dimension, reach and meet inter process dimensional requirement and design performance requirement.
Front stifled dish 1 and rear stifled dish 2 have gradient 1.5-2mm towards workpiece lumen direction.
Claims (7)
1. a thin-walled inlets structure cast aluminium alloy cabin section method for controlling heat treatment deformation, comprises the steps:
The first step mounting tool: stifled dish before and after installing on workpiece, front stifled dish is positioned at workpiece great circle leading section, and rear stifled dish is positioned at workpiece great circle rearward end;
Second steps into stove process: stove is put into downward vertically in workpiece front end;
Intensification thermal treatment in 3rd step stove: select charging temperature to be less than 300 DEG C, rise to 530 DEG C with the speed of 80 DEG C/h, insulation 0.2h, rises to 540 DEG C with the heat-up rate of 0.5 DEG C/min;
4th step solution treatment: workpiece is at 540 DEG C of insulation 14h, and then enter water rapidly with the transport velocity being not more than 10s, water temperature requires 50-60 DEG C, and workpiece stops 5min in water;
Front and back on workpiece are blocked up dish and are taken off, the ovality of calibration of workpieces great circle by the 5th step school shape process, then correct the position skew of uptake;
6th step ageing treatment: stifled dish before and after reinstalling on workpiece, workpiece natural aging 8 hours laggard row artificial agings 7.5 hours in atmosphere.
2. thin-walled inlets structure cast aluminium alloy cabin according to claim 1 section method for controlling heat treatment deformation, it is characterized in that, described artificially aged temperature is 155 DEG C ± 5 DEG C.
3. thin-walled inlets structure cast aluminium alloy cabin according to claim 1 section method for controlling heat treatment deformation, is characterized in that, described 5th step school shape process completes in 1 hour after workpiece water outlet.
4. thin-walled inlets structure cast aluminium alloy cabin according to claim 1 section method for controlling heat treatment deformation, is characterized in that, in the process of described school shape, adopts panel beating mode to correct great circle ovality.
5. thin-walled inlets structure cast aluminium alloy cabin according to claim 1 section method for controlling heat treatment deformation, it is characterized in that, in the process of described school shape, by the great circle of workpiece as benchmark, great circle is fixed, adopts hydraulic efficiency plant to correct the skew at center between uptake part and great circle.
6. thin-walled inlets structure cast aluminium alloy cabin according to claim 1 section method for controlling heat treatment deformation, is characterized in that, the stifled dish in described front and back has gradient 1.5-2mm towards workpiece lumen direction.
7. thin-walled inlets structure cast aluminium alloy cabin according to claim 5 section method for controlling heat treatment deformation, is characterized in that, the mode of described fixing great circle adopts the clip be fixed on a platform to be fixed.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105506522A (en) * | 2015-12-24 | 2016-04-20 | 西北工业大学 | Correction method for heat treatment deformation of frame-class aluminum alloy casting |
| CN106756659A (en) * | 2016-12-02 | 2017-05-31 | 北京有色金属研究总院 | A kind of inductile difficult-to-deformation material sheet material school shape and heat treatment method |
| CN107513677A (en) * | 2017-09-22 | 2017-12-26 | 航天材料及工艺研究所 | A kind of major diameter, large modulus spheroid shape face tank Loadings On Hemispherical Shell method for controlling heat treatment deformation |
| CN108118271A (en) * | 2017-12-08 | 2018-06-05 | 北京星航机电装备有限公司 | A kind of allotype aluminum alloy bay section method for controlling heat treatment deformation |
| CN108998652A (en) * | 2018-09-25 | 2018-12-14 | 株洲市九洲传动机械设备有限公司 | A kind of heat treatment method of cast aluminium alloy gold gear-box |
| CN110735025A (en) * | 2018-02-01 | 2020-01-31 | 中国兵器工业第五九研究所 | Preparation method of high-performance aluminum alloy necking cylinder |
| CN112808788A (en) * | 2020-12-31 | 2021-05-18 | 淮安和通汽车零部件有限公司 | Extrusion processing method of automobile anti-collision beam |
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| CN101709366B (en) * | 2009-11-03 | 2011-07-20 | 贵州安吉有色铸造有限责任公司 | Heat treatment method for improving mechanical property of thin-wall case aluminium alloy castings |
| CN102363259B (en) * | 2011-09-22 | 2013-01-23 | 哈尔滨哈飞工业有限责任公司 | Molding method for casting and forging structure piece of wheelchair frame |
| CN102409270A (en) * | 2011-11-07 | 2012-04-11 | 内蒙古北方重工业集团有限公司 | Method for rolling large-sized aluminum alloy ring piece and performing solid solution treatment by using electric furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105506522A (en) * | 2015-12-24 | 2016-04-20 | 西北工业大学 | Correction method for heat treatment deformation of frame-class aluminum alloy casting |
| CN106756659A (en) * | 2016-12-02 | 2017-05-31 | 北京有色金属研究总院 | A kind of inductile difficult-to-deformation material sheet material school shape and heat treatment method |
| CN107513677A (en) * | 2017-09-22 | 2017-12-26 | 航天材料及工艺研究所 | A kind of major diameter, large modulus spheroid shape face tank Loadings On Hemispherical Shell method for controlling heat treatment deformation |
| CN108118271A (en) * | 2017-12-08 | 2018-06-05 | 北京星航机电装备有限公司 | A kind of allotype aluminum alloy bay section method for controlling heat treatment deformation |
| CN108118271B (en) * | 2017-12-08 | 2019-08-06 | 北京星航机电装备有限公司 | A kind of allotype aluminum alloy bay section method for controlling heat treatment deformation |
| CN110735025A (en) * | 2018-02-01 | 2020-01-31 | 中国兵器工业第五九研究所 | Preparation method of high-performance aluminum alloy necking cylinder |
| CN110735025B (en) * | 2018-02-01 | 2021-01-15 | 中国兵器工业第五九研究所 | Preparation method of high-performance aluminum alloy closing-in barrel |
| CN108998652A (en) * | 2018-09-25 | 2018-12-14 | 株洲市九洲传动机械设备有限公司 | A kind of heat treatment method of cast aluminium alloy gold gear-box |
| CN112808788A (en) * | 2020-12-31 | 2021-05-18 | 淮安和通汽车零部件有限公司 | Extrusion processing method of automobile anti-collision beam |
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| CN104694857B (en) | 2016-08-24 |
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