CN107282668B - A kind of big wide cut LF6 aluminum alloy strip gusset extruding production technology - Google Patents
A kind of big wide cut LF6 aluminum alloy strip gusset extruding production technology Download PDFInfo
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- CN107282668B CN107282668B CN201710564139.2A CN201710564139A CN107282668B CN 107282668 B CN107282668 B CN 107282668B CN 201710564139 A CN201710564139 A CN 201710564139A CN 107282668 B CN107282668 B CN 107282668B
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- aluminum alloy
- alloy strip
- strip gusset
- aluminium alloy
- wide cut
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/06—Making sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/02—Cooling or heating of containers for metal to be extruded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/04—Cooling or heating of press heads, dies or mandrels
-
- 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
Abstract
The invention belongs to aluminium alloy technology fields,It is related to a kind of big wide cut LF6 aluminum alloy strip gusset extruding production technology,Extrusion cylinder in extruder uses fraction gradient heating method,The heating temperature on extrusion cylinder head is 440~460 DEG C,The heating temperature at middle part is 440~460 DEG C,The heating temperature of tail portion is 370~390 DEG C,The LF6 aluminum alloy strip gusset prepared by the extruding production technology,Although good not as good as existing 6 line aluminium alloy sheet with rib extrusion forming,But loss of strength is big after existing 6 line aluminium alloy sheet with rib welding and corrosion resistance is far away from LF6 alloy,It is existing to squeeze that the batch production of LF6 aluminum alloy strip gusset not only may be implemented in production technology and the big cross section width of aluminum alloy strip gusset is effectively reduced the passage of subsequent welding,Greatly improve the intensity and tightness of ship entirety.
Description
Technical field
The invention belongs to aluminium alloy technology fields, are related to a kind of big wide cut LF6 aluminum alloy strip gusset extruding production work
Skill.
Background technique
Its structural material of the operating environment requirements of ship has high specific strength, toughness, corrosion resistance, antifatigue, shock resistance
And the comprehensive performances such as good weldability, especially ship of the traveling in marine environment, because seawater contains a large amount of Cl-, it is
There is a kind of typical electrolytic solution very strong corrosivity more to require material peculiar to vessel under this strong corrosive environment and stress
Expect the electrochemically resistant corrosion and anti-stress corrosion performance that have excellent.In traditional material, although steel and polymer-based compound
Material has an a large amount of application in shipbuilding, but that there is steel and high molecular material not to have is a series of for aluminum alloy materials
Comprehensive performance, high specific strength and corrosion resistance, excellent formability and weldability easily recycle and make aluminium the features such as anti-aging
Alloy in shipbuilding using more and more, and have a high potential, have a extensive future.
Ship building accouterment component is mostly replaced in actual production with 6 line aluminium alloys, because of big wide cut LF6 aluminium alloy
Domestic unstable extruding production technology at present, existing 6 line aluminium alloy is that some extruding tonnages are small, extrusion ratio is small, wide
Plate narrow, that thickness is big is spent, big wide cut LF6 aluminum alloy strip gusset production is carried out using normal extrusion parameter and technique will be unable to
Realize extrusion forming process.In addition, corrosion resistance is far away from LF6 after 6 line aluminium alloy timeliness, and LF6 is with higher than strong
Degree and corrosion resistance, performance loss is smaller after material welding, and therefore, big wide cut LF6 aluminum alloy strip gusset squeezes grinding for production technology
Study carefully and is of great immediate significance.
Summary of the invention
In view of this, the present invention can not be applied to the conjunction of big wide cut LF6 aluminium to solve existing 6 line aluminium alloy extrusion process
It is crowded to provide a kind of big wide cut LF6 aluminum alloy strip gusset for gold ribbon gusset, the problem of big wide cut LF6 aluminum alloy strip gusset mouldability hardly possible
Press production technology.
In order to achieve the above objectives, the present invention provides a kind of big wide cut LF6 aluminum alloy strip gusset extruding production technology, including such as
Lower step：
A, LF6 aluminium alloy cast ingot is pre-processed, pretreated ingot casting is in 450~480 DEG C of homogenizing anneal 12h
Afterwards, it is placed in the extrusion cylinder of extruder；
B, product mold in extrusion cylinder is heated to 450~500 DEG C, the control of LF6 aluminium alloy cast ingot temperature for 380 DEG C~
410 DEG C, extruder outlet temperature is controlled at 300~340 DEG C, and the workbench equipped with product mold is matched for clamping tightly with extrusion cylinder；
C, the extrusion cylinder in extruder is run with the extrusion speed of 2.5~3.5m/min to product mold, to LF6 aluminium alloy
Ingot casting is squeezed, and LF6 aluminium alloy cast ingot is squeezed out from the die hole of product mold, obtains LF6 aluminum alloy strip gusset lath, wherein
LF6 aluminium alloy cast ingot uses fraction gradient heating method, and the heating temperature on extrusion cylinder head is 440~460 DEG C, the heating at middle part
Temperature is 440~460 DEG C, and the heating temperature of tail portion is 370~390 DEG C；
D, LF6 aluminum alloy strip gusset lath made from step C is quenched, quenching mode is air-cooled and is atomized cold
Synchronous mode, quenched LF6 aluminum alloy strip gusset lath temperature are 120~130 DEG C；
E, quenched LF6 aluminum alloy strip gusset lath being subjected to aging strengthening model, aging temp is 180~220 DEG C, when
The effect time is 3~8h；
F, the LF6 aluminum alloy strip gusset lath after aging strengthening model is welded as big wide cut LF6 aluminum alloy strip gusset.
Further, LF6 aluminium alloy cast ingot alloying component is in step A：Si≤0.4%, Fe≤0.4%, Cu≤0.10%,
Mn0.60%~0.8%, Mg6.5%~6.8%, Zn≤0.20%, Ti≤0.02%, single impurity content≤0.05%,
Remaining impurity total≤0.15%, surplus Al, the weight percent summation of each component are 100%.
Further, the extrusion ring of product mold selects the dedicated ring of LF6 aluminum alloy strip gusset to reduce product mold in step B
Pressure-bearing.
Further, product mold unit area stress is 66Kg/cm in step B2, LF6 aluminium alloy cast ingot width-thickness ratio is 50.
Further, LF6 aluminium alloy cast ingot width is 250mm, with a thickness of 5mm.
Further, the extrusion ratio of step C extrusion cylinder is 75.6~80.
Further, the extrusion ratio of step C extrusion cylinder is 75.6.
Further, step E aging heat treatment temperature is 200 DEG C, aging time 6h.
The beneficial effects of the present invention are：
L, big wide cut LF6 aluminum alloy strip gusset squeezes the LF6 aluminum alloy strip gusset that production technology produces through the invention, closes
Golden intensity is：σ b > 345MPa, 0.2 σ > 210MPa, δ > 20%, and existing 6 line aluminium alloy intensity is：σ b > 290MPa, σ
0.2 > 250MPa, δ >=6%.After carrying out Peeling Corrosion test to aluminum alloy strip gusset according to ASTM G66, Peeling Corrosion grade
It is N grades, no Peeling Corrosion phenomenon.Intercrystalline corrosion detection is carried out to LF6 aluminum alloy strip gusset according to ASTM G67, testing result is
The mass loss of unit area product is 5~10mg/cm2Belong to resistant material (mass loss≤15mg/ in unit area
cm2)。
2, when big wide cut LF6 aluminum alloy strip gusset squeezes the LF6 aluminum alloy strip gusset of production technology production through the invention
Corrosion resistance after effect is better than 6 line aluminium alloys, and LF6 aluminum alloy strip gusset specific strength with higher, after material welding
Performance loss is smaller, and the advanced equipment of Commercial cultivation of big width sheet with rib and particular manufacturing craft pad match in the present invention,
It squeezes aspect and quenches preceding temperature control at 330 DEG C or less and according to LF6 aluminum alloy strip muscle using LF6 aluminum alloy strip gusset lath
The plate panel surface situation control pressure ram speed of service carries out the mouldability of micro adjustment product, finally solves big wide cut LF6
The industry problems of aluminum alloy strip gusset mouldability hardly possible.
Specific embodiment
Below by a preferred embodiment of the present invention will be described in detail.
Embodiment 1：
A kind of big wide cut LF6 aluminum alloy strip gusset extruding production technology, includes the following steps：
A, ingredient：LF6 aluminium alloy cast ingot each element mass percent proportion is as follows：
| Element | Si | Fe | Cu | Mn | Mg | Zn | Ti | Impurity | Al |
| Content | 0.40 | 0.40 | 0.10 | 0.80 | 6.80 | 0.20 | 0.02 | 0.15 | Surplus |
LF6 aluminium alloy cast ingot is pre-processed, pretreated ingot casting is placed in crowded after 450 DEG C of homogenizing anneal 12h
In the extrusion cylinder of press；
B, product mold in extrusion cylinder is heated to 500 DEG C, the control of LF6 aluminium alloy cast ingot temperature is 410 DEG C, and extruder goes out
Workbench equipped with product mold is matched for clamping tightly by mouth temperature control at 330 DEG C with extrusion cylinder, and the extrusion ring of product mold is selected
The dedicated ring of LF6 aluminum alloy strip gusset reduces the pressure-bearing of product mold, and wherein product mold unit area stress is 66Kg/cm2,
LF6 aluminium alloy cast ingot width is 250mm, with a thickness of 5mm；
C, the extrusion cylinder in extruder is run with the extrusion speed of 2.5m/min to product mold, to LF6 aluminium alloy cast ingot
It is squeezed, LF6 aluminium alloy cast ingot is squeezed out from the die hole of product mold, obtains LF6 aluminum alloy strip gusset lath, wherein LF6
Aluminium alloy cast ingot uses fraction gradient heating method, and the heating temperature on extrusion cylinder head is 440 DEG C, and the heating temperature at middle part is
440 DEG C, the heating temperature of tail portion is 370 DEG C, and wherein the extrusion ratio of extrusion cylinder is 75.6；
D, LF6 aluminum alloy strip gusset lath made from step C is quenched, quenching mode is air-cooled and is atomized cold
Synchronous mode, quenched LF6 aluminum alloy strip gusset lath temperature are 130 DEG C；
E, quenched LF6 aluminum alloy strip gusset lath is subjected to aging strengthening model, aging temp is 210 DEG C, when timeliness
Between be 5h：
F, the LF6 aluminum alloy strip gusset lath after aging strengthening model is welded as big wide cut LF6 aluminum alloy strip gusset.
Embodiment 2：
A kind of big wide cut LF6 aluminum alloy strip gusset extruding production technology, includes the following steps：
A, ingredient：LF6 aluminium alloy cast ingot each element mass percent proportion is as follows：
| Element | Si | Fe | Cu | Mn | Mg | Zn | Ti | Impurity | Al |
| Content | 0.40 | 0.40 | 0.10 | 0.60 | 6.50 | 0.20 | 0.02 | 0.15 | Surplus |
LF6 aluminium alloy cast ingot is pre-processed, pretreated ingot casting is placed in crowded after 450 DEG C of homogenizing anneal 12h
In the extrusion cylinder of press；
B, product mold in extrusion cylinder is heated to 500 DEG C, the control of LF6 aluminium alloy cast ingot temperature is 410 DEG C, and extruder goes out
Workbench equipped with product mold is matched for clamping tightly by mouth temperature control at 330 DEG C with extrusion cylinder, and the extrusion ring of product mold is selected
The dedicated ring of LF6 aluminum alloy strip gusset reduces the pressure-bearing of product mold, and wherein product mold unit area stress is 66Kg/cm2,
LF6 aluminium alloy cast ingot width is 250mm, with a thickness of 5mm；
C, the extrusion cylinder in extruder is run with the extrusion speed of 3.5m/min to product mold, to LF6 aluminium alloy cast ingot
It is squeezed, LF6 aluminium alloy cast ingot is squeezed out from the die hole of product mold, obtains LF6 aluminum alloy strip gusset lath, wherein LF6
Aluminium alloy cast ingot uses fraction gradient heating method, and the heating temperature on extrusion cylinder head is 460 DEG C, and the heating temperature at middle part is
460 DEG C, the heating temperature of tail portion is 390 DEG C, and wherein the extrusion ratio of extrusion cylinder is 75.6；
D, LF6 aluminum alloy strip gusset lath made from step C is quenched, quenching mode is air-cooled and is atomized cold
Synchronous mode, quenched LF6 aluminum alloy strip gusset lath temperature are 130 DEG C；
E, quenched LF6 aluminum alloy strip gusset lath is subjected to aging strengthening model, aging temp is 200 DEG C, when timeliness
Between be 6h；
F, the LF6 aluminum alloy strip gusset lath after aging strengthening model is welded as big wide cut LF6 aluminum alloy strip gusset.
Embodiment 3：
The difference from example 2 is that the heating temperature on extrusion cylinder head is 450 DEG C in step C, middle part adds embodiment 3
Hot temperature is 450 DEG C, and the heating temperature of tail portion is 380 DEG C.
Embodiment 4：
The difference of embodiment 4 and embodiment 3 is that the extrusion ratio of extrusion cylinder in step C is 80.
Comparative example：
6 line aluminium alloys of normal extrusion parameter preparation.
Index assessment, big wide cut LF6 aluminum alloy strip are carried out to the big wide cut LF6 aluminum alloy strip gusset that Examples 1 to 4 obtains
The intercrystalline corrosion evaluating result of gusset such as table one, Peeling Corrosion evaluating result such as table two：
Table one
It is found by the analysis to one result of table, the intergranular that big wide cut LF6 aluminum alloy strip gusset is annealed 2 hours at 180 DEG C
Corrode it is all exceeded, although 190 DEG C of annealing intercrystalline corrosion in 2 hours without exceeded, close to 15mg/cm2.200 DEG C of annealing 2 are small
When intercrystalline corrosion be less than 5mg/cm2.210 DEG C, 220 DEG C of annealing intercrystalline corrosion in 2 hours be even more to be less than 4mg/cm2.Therefore, in order to protect
For the sake of danger, stabilization temperature is preferably higher than 200 DEG C.
Table two
Wherein Peeling Corrosion grade is that N indicates that corrosion of aluminium alloy is not serious, there is microetch or decoloration phenomenon on surface；It peels off rotten
Erosion grade is that P expression spot corrosion occurs, and tiny spot corrosion or blistering occurs in surface, blistering phenomenon occurs and illustrates that corrosion is slightly deep
Enter specimen surface；Peeling Corrosion grade is that E expression Peeling Corrosion occurs, and surface is in significant aliquation phenomenon.
Mechanics Performance Testing is carried out to the big wide cut LF6 aluminum alloy strip gusset that Examples 1 to 4 obtains, test result is shown in Table
Three：
Table three：
| Tensile strength (MPa) | Yield strength (MPa) | Elongation percentage (%) | |
| Embodiment 1 | 345 | 220 | 20.2 |
| Embodiment 2 | 350 | 216 | 20.4 |
| Embodiment 3 | 352 | 215 | 20.8 |
| Embodiment 4 | 357 | 211 | 20.5 |
| Embodiment 5 | 361 | 216 | 20.3 |
| Comparative example | 290 | 250 | 6.2 |
As shown in Table 3, big wide cut LF6 aluminum alloy strip gusset squeezes the LF6 aluminium alloy that production technology produces through the invention
Sheet with rib tensile strength is higher than the tensile strength of existing 6 line aluminium alloy, and LF6 aluminum alloy strip gusset yield strength is lower than existing 6 system
The yield strength of aluminium alloy, LF6 aluminum alloy strip gusset elongation percentage are higher than the elongation percentage of existing 6 line aluminium alloy.
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 (5)
1. a kind of big wide cut LF6 aluminum alloy strip gusset squeezes production technology, which is characterized in that include the following steps：
A, LF6 aluminium alloy cast ingot is pre-processed, pretreated ingot casting is set after 450~480 DEG C of homogenizing anneal 12h
In the extrusion cylinder of extruder；
B, product mold in extrusion cylinder being heated to 450~500 DEG C, the control of LF6 aluminium alloy cast ingot temperature is 380 DEG C~410 DEG C,
Extruder outlet temperature is controlled at 300~340 DEG C, the workbench equipped with product mold is matched for clamping tightly with extrusion cylinder, wherein producing
The extrusion ring of product mold selects the dedicated ring of LF6 aluminum alloy strip gusset to reduce the pressure-bearing of product mold, product mold unit area
Stress is 66Kg/cm2, LF6 aluminium alloy cast ingot width-thickness ratio is 50；
C, the extrusion cylinder in extruder is run with the extrusion speed of 2.5~3.5m/min to product mold, to LF6 aluminium alloy cast ingot
It is squeezed, LF6 aluminium alloy cast ingot is squeezed out from the die hole of product mold, obtains LF6 aluminum alloy strip gusset lath, wherein LF6
Aluminium alloy cast ingot uses fraction gradient heating method, and the heating temperature on extrusion cylinder head is 440~460 DEG C, the heating temperature at middle part
Degree is 440~460 DEG C, and the heating temperature of tail portion is 370~390 DEG C, and the extrusion ratio of extrusion cylinder is 75.6~80；
D, LF6 aluminum alloy strip gusset lath made from step C is quenched, quenching mode is air-cooled and atomization is cooling same
The mode of step, quenched LF6 aluminum alloy strip gusset lath temperature are 120~130 DEG C；
E, quenched LF6 aluminum alloy strip gusset lath is subjected to aging strengthening model, aging temp is 180~220 DEG C, when timeliness
Between be 3~8h；
F, the LF6 aluminum alloy strip gusset lath after aging strengthening model is welded as big wide cut LF6 aluminum alloy strip gusset.
2. big wide cut LF6 aluminum alloy strip gusset as described in claim 1 squeezes production technology, which is characterized in that in step A
LF6 aluminium alloy cast ingot alloying component is：Si≤0.4%, Fe≤0.4%, Cu≤0.10%, Mn0.60%~0.8%,
Mg6.5%~6.8%, Zn≤0.20%, Ti≤0.02%, single impurity content≤0.05%, remaining impurity is total≤
0.15%, surplus Al, the weight percent summation of each component are 100%.
3. big wide cut LF6 aluminum alloy strip gusset as claimed in claim 2 squeezes production technology, which is characterized in that LF6 aluminium alloy
Ingot casting width is 250mm, with a thickness of 5mm.
4. big wide cut LF6 aluminum alloy strip gusset as claimed in claim 3 squeezes production technology, which is characterized in that step C is squeezed
The extrusion ratio of cylinder is 75.6.
5. big wide cut LF6 aluminum alloy strip gusset as claimed in claim 4 squeezes production technology, which is characterized in that step E timeliness
The temperature of heat treatment is 200 DEG C, aging time 6h.
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| CN109570258A (en) * | 2018-11-15 | 2019-04-05 | 中南大学 | A kind of wide cut sheet with rib material and its integral forming method |
| CN109570418B (en) * | 2018-11-23 | 2020-06-12 | 哈尔滨工业大学 | Precise forming method for aluminum alloy rib plate type rectangular forge piece |
| CN112547831B (en) * | 2020-11-24 | 2021-11-09 | 东北大学 | Large-width aluminum alloy ribbed plate, production method thereof and extrusion perforating needle |
| CN113976652A (en) * | 2021-09-27 | 2022-01-28 | 营口忠旺铝业有限公司 | Extrusion production process of wide radiator |
| CN114309108A (en) * | 2021-12-09 | 2022-04-12 | 山东兖矿轻合金有限公司 | Extrusion forming method of oversized aluminum alloy integral wallboard for ships |
| CN114182183A (en) * | 2021-12-09 | 2022-03-15 | 苏州创泰合金材料有限公司 | Aluminum alloy heat treatment process |
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