CN107604275B - A kind of strong 7055 Production technology of aluminum alloy sectional bar of superelevation - Google Patents
A kind of strong 7055 Production technology of aluminum alloy sectional bar of superelevation Download PDFInfo
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- CN107604275B CN107604275B CN201711004787.9A CN201711004787A CN107604275B CN 107604275 B CN107604275 B CN 107604275B CN 201711004787 A CN201711004787 A CN 201711004787A CN 107604275 B CN107604275 B CN 107604275B
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Abstract
The invention belongs to aluminum alloy heat field of extrusion, it is related to a kind of strong 7055 Production technology of aluminum alloy sectional bar of superelevation, pass through the improvement of extrusion die, work belt size is foreshortened into 13~25mm by 18~28mm of raw footage, it squeezes breakthrough pressure and 19bar is dropped to by 25bar, the strong 7055 alloy work profile extrusion die heating temperature of superelevation maintains 450 DEG C ± 10 DEG C in extrusion process, heat preservation remains unchanged for 5 hours, extrusion cylinder heating temperature drops to 410 DEG C ± 10 DEG C by 420 ± 10 DEG C, casting rod heating temperature drops to 390 DEG C ± 10 DEG C by 420 ± 10 DEG C, drum material extruding efficiency is finally increased to 0.7~0.8m/min by 0.3~0.5m/min, it is reasonably selected by extruder, extrusion die and extrusion process optimization design etc. , final to realize that reaching Unite States Standard requires product forms, import outside surrogate.
Description
Technical field
The invention belongs to aluminum alloy heat field of extrusion, are related to a kind of strong 7055 Production technology of aluminum alloy sectional bar of superelevation.
Background technique
7055 alloys are also known as ultrahigh-strength aluminum alloy, and extrudate is mainly used in wing wallboard, wing cover etc.
Stress members, wherein 7055 alloy extrudate products largely rely on import, the country is still in out the alloy product
In the hair stage, only several units have the ability to develop 7055 alloys, but there are still more problem, major embodiments: (1) 7055 aluminium
The higher extrusion deformation resistance of alloy strength is larger, and product size tolerance is difficult to control；(2) profile extrusion low efficiency, extrusion process
The defects of middle Surface of profile is easily cracked.
Summary of the invention
In view of this, the present invention is low in order to solve 7055 aluminium alloy extrusions extruding efficiencies, it is easy to appear and splits in extrusion process
The problem of line, provides a kind of strong 7055 Production technology of aluminum alloy sectional bar of superelevation.
In order to achieve the above objectives, the present invention provides a kind of strong 7055 Production technology of aluminum alloy sectional bar of superelevation, including following step
It is rapid:
A, founding: aluminium alloy stock is prepared according to the weight fraction ratio of 7055 aluminium alloys, by prepared aluminium alloy stock
It is liquid aluminium alloy that melting after evenly mixing, which is added in smelting furnace, is aluminium alloy cast rod by liquid aluminium alloy cooling casting；
B, Homogenization Treatments: founding is obtained into aluminium alloy cast rod and is placed in Homogenization Treatments in homogeneous furnace；
C, it squeezes: the aluminium alloy cast rod after Homogenization Treatments being sent into extruder and is squeezed, 7055 aluminium alloys are obtained
Profile, wherein the heating temperature of mold is 440~460 DEG C, and heating time is 5 hours, the heating temperature of extrusion cylinder is 400~
420 DEG C, the heating temperature of aluminium alloy cast rod is 380~400 DEG C, and the extrusion speed of aluminium alloy cast rod is 0.7~0.8m/min, mould
The flow-guiding mouth of tool is in butterfly structure, and the extruding breakthrough pressure of mold is 19bar；
D, it is heat-treated: 7055 aluminium alloy extrusions after extruding being first subjected to out-line quenching and then carries out artificial aging, wherein
Out-line quenching system is 470 DEG C of * 120min, and by aluminium alloy extrusions water cooling to room temperature after quenching, artificial aging system is 118 DEG C of *
5h+157 DEG C of * 7h, the aluminium alloy extrusions after artificial aging is cooling with furnace temperature, obtains strong 7055 aluminium alloy extrusions of superelevation.
Further, aluminium alloy cast rod is heated to 475~485 DEG C in step B, keeps the temperature 10~12 hours, is cooled to room temperature
Aluminium alloy cast rod after to homogeneous.
Further, the butterfly structure corner in step C at mold flow-guiding mouth is arc-shaped.
Further, the land length in step C mold is 13~25mm.
Further, cooling device is provided at step C work belt, cooling device includes liquid nitrogen system and temperature control system
System.
The beneficial effects of the present invention are:
1, the strong 7055 alloy drum material of superelevation used in strong 7055 Production technology of aluminum alloy sectional bar of superelevation of the present invention squeezes
Compression mould by three-dimensional modeling and FEM Simulation, Optimization Work band size foreshortens to 13 by 18~28mm of raw footage~
25mm squeezes breakthrough pressure by 25bar and drops to 19bar, and aluminium alloy extrusions dimensional accuracy greatly improves, and metal enters to carry out at head piece
Butterfly architecture design, which solves to squeeze between profile and profile, links discontinuous problem.
2, pass through the improvement to strong 7055 Production technology of aluminum alloy sectional bar of superelevation of the present invention, the strong 7055 alloy drum material of superelevation
Extrusion die heating temperature maintains 450 DEG C ± 10 DEG C, and heat preservation remains unchanged for 5 hours, and extrusion cylinder heating temperature is by 420 ± 10 DEG C
Drop to 410 DEG C ± 10 DEG C, casting rod heating temperature drops to 390 DEG C ± 10 DEG C by 420 ± 10 DEG C, finally squeezes drum material and imitates
Rate is increased to 0.7~0.8m/min by 0.3~0.5m/min, and solves the problems, such as aluminium alloy extrusions compressive surface crackle.
3, the strong 7055 alloy drum material of superelevation used in strong 7055 Production technology of aluminum alloy sectional bar of superelevation of the present invention squeezes
Compression mould increases mold flow-guiding structure by optimizing mold compared with existing flat-die, reduces work belt size and effectively drop
Low extruding drag, improves aluminium alloy extrusions dimensional accuracy, reduces die deformation.
4, strong 7055 Production technology of aluminum alloy sectional bar of superelevation of the present invention squeezes work by optimization compared with existing extrusion process
Skill parameter makes each influence factor Proper Match, solves the strong alloy extrusion difficult forming of superelevation, the low problem of production efficiency.
5, strong 7055 Production technology of aluminum alloy sectional bar T76511 as defined in the AMS4336 standard heat treatment system of superelevation of the present invention
Degree (470 DEG C of * 120min, water quenching, 118 DEG C of * 5h+157 DEG C * 7h) is heat-treated aluminium alloy extrusions, and performance can reach tension
Intensity 675Mpa, yield strength 640MPa, elongation 9.5%, and make the strong 7055 aluminium alloy extrusions production of superelevation through the invention
Efficiency improves nearly 90%, and yield rate improves 20%.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is profile sectional schematic diagram after the strong 7055 aluminium alloy extrusions extrusion process extruding of superelevation through the invention；
Fig. 2 is used extrusion die main view by the strong 7055 aluminium alloy extrusions extrusion process of superelevation of the present invention；
Fig. 3 is used extrusion die left view by the strong 7055 aluminium alloy extrusions extrusion process of superelevation of the present invention；
Fig. 4 is used extrusion die three-dimensional simulation figure by the strong 7055 aluminium alloy extrusions extrusion process of superelevation of the present invention.
Specific embodiment
Below by a preferred embodiment of the present invention will be described in detail.
Embodiment 1
A kind of strong 7055 Production technology of aluminum alloy sectional bar of superelevation, comprising the following steps:
A, founding: aluminium alloy stock is prepared according to the weight fraction ratio of 7055 aluminium alloys, by prepared aluminium alloy stock
It is liquid aluminium alloy that melting after evenly mixing, which is added in smelting furnace, is aluminium alloy cast rod by liquid aluminium alloy cooling casting；
B, Homogenization Treatments: aluminium alloy cast rod is heated to 475 DEG C, 12 hours is kept the temperature, is cooled to room temperature after obtaining homogeneous
Aluminium alloy cast rod；
C, it squeezes: the aluminium alloy cast rod after Homogenization Treatments being sent into extruder and is squeezed, so that aluminium alloy cast rod
Enter in mold after passing through extruder, the extrusion forming in mold obtains 7055 aluminium alloy extrusions, wherein the heating of mold
Temperature is 440 DEG C, and heating time is 5 hours, and the heating temperature of extrusion cylinder is 400 DEG C, and the heating temperature of aluminium alloy cast rod is 380
DEG C, the extrusion speed 0.7m/min of aluminium alloy cast rod is in butterfly structure at mold flow-guiding mouth, and butterfly structure turns at mold flow-guiding mouth
It is arc-shaped at angle, the land length in mold is 13mm, is provided with cooling device at work belt, cooling device includes liquid nitrogen
System and temperature control system, the extruding breakthrough pressure of mold are 19bar；
D, it is heat-treated: 7055 aluminium alloy extrusions after extruding being first subjected to out-line quenching and so carries out artificial aging again, wherein
Out-line quenching system keeps the temperature 120min at a temperature of being 470 DEG C, by aluminium alloy extrusions water cooling to room temperature, artificial aging system after quenching
Degree keeps the temperature 7h at a temperature of 157 DEG C after keeping the temperature 5h at a temperature of being 118 DEG C, and the aluminium alloy extrusions after artificial aging is cold with furnace temperature
But, strong 7055 aluminium alloy extrusions of superelevation is obtained.
Embodiment 2
Embodiment 2 the difference from embodiment 1 is that, aluminium alloy cast rod is heated to 485 DEG C in step B, keeps the temperature 10 hours,
It is cooled to room temperature to obtain the aluminium alloy cast rod after homogeneous.
Embodiment 3
Embodiment 3 the difference from embodiment 1 is that, the heating temperature of mold is 460 DEG C in step C, and heating time is 5 small
When, the heating temperature of extrusion cylinder is 420 DEG C, and the heating temperature of aluminium alloy cast rod is 400 DEG C, the extrusion speed of aluminium alloy cast rod
0.8m/min is in butterfly structure at mold flow-guiding mouth, and butterfly structure corner is arc-shaped at mold flow-guiding mouth, the work in mold
Making strip length is 25mm, is provided with cooling device at work belt, cooling device includes liquid nitrogen system and temperature control system, mold
Extruding breakthrough pressure be 19bar.
Embodiment 4
Embodiment 4 the difference from embodiment 1 is that, 7055 aluminium alloy extrusions after extruding is placed in 480 DEG C of guarantor in step D
120min is kept the temperature in warm furnace, the quenching-in water 5h that 7055 aluminium alloy extrusions after heat preservation are first placed in 120 DEG C is placed in 160 DEG C of water again
Middle quenching 7h.
Embodiment 5
Embodiment 5 the difference from embodiment 1 is that, 7055 aluminium alloy extrusions after extruding is placed in 470 DEG C of guarantor in step D
120min is kept the temperature in warm furnace, the quenching-in water 5h that 7055 aluminium alloy extrusions after heat preservation are first placed in 120 DEG C is placed in 160 DEG C of water again
Middle quenching 7h.
Comparative example 1
Comparative example 1 the difference from embodiment 1 is that, in step C the heating temperature of extrusion cylinder be 430 DEG C, aluminium alloy cast rod
Heating temperature be 410 DEG C, the extrusion speed 0.3m/min of aluminium alloy cast rod, the land length in extrusion die is 18mm,
Cooling device is provided at work belt, cooling device includes liquid nitrogen system and temperature control system, the extruding breakthrough pressure of mold
For 25bar.
Comparative example 2
Comparative example 2 the difference from embodiment 1 is that, in step C the heating temperature of extrusion cylinder be 410 DEG C, aluminium alloy cast rod
Heating temperature be 430 DEG C, the extrusion speed 0.5m/min of aluminium alloy cast rod, the land length in extrusion die is 28mm,
Cooling device is provided at work belt, cooling device includes liquid nitrogen system and temperature control system, the extruding breakthrough pressure of mold
For 25bar.
Mechanics Performance Testing is carried out to strong 7055 aluminium alloy extrusions of superelevation that Examples 1 to 5 and comparative example 1~2 obtain, is surveyed
Test result is shown in Table one:
Table one:
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Comparative example 1 | Comparative example 2 | |
| Yield strength (Mpa) | 668 | 665 | 670 | 664 | 675 | 565 | 559 |
| Tensile strength (Mpa) | 620 | 625 | 630 | 625 | 640 | 570 | 560 |
| Elongation percentage (%) | 8 | 8.5 | 8.9 | 9.2 | 9.5 | 8 | 7 |
As can be seen from the above table, the line aluminium alloy type that through the invention prepared by the strong 7055 aluminium alloy extrusions extrusion process of superelevation
Material, tensile strength highest can achieve 675MPa, and yield strength reaches 640MPa, elongation 9.5%.In the embodiment of the present invention 5
Aluminium alloy extrusions T76511 as defined in AMS4336 standard of the strong 7055 aluminium alloy extrusions extrusion process preparation of superelevation is heat-treated system
Degree, reduces the consumption of the energy, while mechanical performance is greatly improved.Furthermore by being prepared to embodiment 5 and comparative example 1
The statistics of aluminium alloy extrusions speed of production and yield rate, the strong 7055 aluminium alloy extrusions extrusion process of superelevation is raw through the invention for discovery
It produces 7055 aluminium alloy extrusions production efficiencys and improves nearly 90%, yield rate improves 20%.
Appended drawing reference in the strong 7055 aluminium alloy section extruding die tool of superelevation are as follows: die hole type chamber 1, cup 2, rear chamber 3, positioning pin
4, screw 5, die-cushion 6, empty knife 7, diversion trench 8, guide plate 9, work belt 10.
A kind of superelevation as shown in Figure 1, 2 strong 7055 aluminium alloy section extruding die tool, including as shown in Figure 4 discoid
Upper die and lower die, the positioning pin 4 that upper die and lower die are limited and the screw 5 for being coupled fixed upper and lower mould with positioning pin 4, installation
Positioning pin 4 in upper mold is in 180 °, and two groups of screws 5 are installed in the two sides of positioning pin 4 respectively, the cooperation of positioning pin 4 and screw 5,
Upper die and lower die are enabled to fasten more firm.
I-shaped die hole type chamber 1 is arranged in the middle part of upper mold as shown in Figure 3, and 1 right side side of die hole type chamber is butterfly cup
2, the corner of butterfly cup 2 is arc-shaped, is the rear chamber 3 being provided in lower die, 1 He of die hole type chamber on the left of die hole type chamber 1
Diversion trench 8, work belt 10 and empty knife 7 are set gradually between rear chamber 3, the outside of cup 2 is the guide plate 9 being mounted in upper mold, after
The outside of room 3 is the die-cushion 6 being mounted in lower die being fixedly connected with guide plate 9, by the cooperation of guide plate 9 and die-cushion 6 so that preceding
Room 2 and rear chamber 3 link together.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (3)
1. a kind of strong 7055 Production technology of aluminum alloy sectional bar of superelevation, which comprises the following steps:
A, founding: aluminium alloy stock is prepared according to the weight fraction ratio of 7055 aluminium alloys, prepared aluminium alloy stock is added
Melting is liquid aluminium alloy after evenly mixing in smelting furnace, is aluminium alloy cast rod by liquid aluminium alloy cooling casting；
B, Homogenization Treatments: founding is obtained into aluminium alloy cast rod and is placed in Homogenization Treatments in homogeneous furnace；
C, it squeezes: the aluminium alloy cast rod after Homogenization Treatments being sent into extruder and is squeezed, 7055 aluminium alloy extrusions are obtained,
Wherein the heating temperature of mold is 440 ~ 460 DEG C, and heating time is 5 hours, and the heating temperature of extrusion cylinder is 400 ~ 420 DEG C, aluminium
The heating temperature of alloy casting rod is 380 ~ 400 DEG C, and the extrusion speed of aluminium alloy cast rod is 0.7 ~ 0.8m/min, the flow-guiding mouth of mold
In butterfly structure, the butterfly structure corner at mold flow-guiding mouth is arc-shaped, and the extruding breakthrough pressure of mold is 19bar, mould
Land length in tool is 13 ~ 25mm；
D, it is heat-treated: 7055 aluminium alloy extrusions after extruding being first subjected to out-line quenching and then carries out artificial aging, wherein offline
Quenching system is 470 DEG C of * 120min, and by aluminium alloy extrusions water cooling to room temperature after quenching, artificial aging system is 118 DEG C of * 5h+
157 DEG C of * 7h, the aluminium alloy extrusions after artificial aging is cooling with furnace temperature, obtains strong 7055 aluminium alloy extrusions of superelevation.
2. strong 7055 Production technology of aluminum alloy sectional bar of superelevation as described in claim 1, which is characterized in that aluminium alloy in step B
Casting rod is heated to 475 ~ 485 DEG C, keeps the temperature 10 ~ 12 hours, is cooled to room temperature to obtain the aluminium alloy cast rod after homogeneous.
3. strong 7055 Production technology of aluminum alloy sectional bar of superelevation as claimed in claim 2, which is characterized in that at step C work belt
It is provided with cooling device, cooling device includes liquid nitrogen system and temperature control system.
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