Process for producing high elongation flexible tube foil from 8011 aluminum alloy billet

Abstract

The present invention belongs to the technical field of light alloys and relates to a process for producing high-extension hose foil from 8011 aluminum alloy billets, comprising: annealing the 8011 aluminum alloy billets at 120-150°C for 18-20 hours before rolling, and naturally cooling them to room temperature; allocating the amount of pressing per pass according to the billet thickness, using 80# mineral oil as the rolling base oil, which contains 65% saturated C 12 Alkanes, 35% C 13 ‑C 14 A saturated alkane mixture is added with methyl laurate and lauryl alcohol and 0.15±0.02% lauric acid in a mass percentage of 7-10%; it is cut by a circular knife, and the moving knife cutting speed is 6-8% of the cutting and coiling speed; the annealing process uses a high temperature short-time performance and a segmented degreasing process, and the degreasing sections are arranged on both sides of the high temperature performance section. The present invention first performs annealing pretreatment on the blank to improve the initial tensile strength and elongation of the blank; the slitting process uses a disc knife combined with a moving knife cutting technology to avoid cracking and breaking of the product, and the high temperature short-time performance and segmented degreasing process in the annealing process improve the high elongation performance of the product.

Description

Technical Field

[0001] The invention belongs to the technical field of light alloys, and relates to a process for rolling, finishing and slitting of aluminium foil, and in particular to a process for producing high-elongation hose foil from 8011 aluminium alloy billets. Background Art

[0002] The hose foil has good light-shielding, airtight and moisture-proof properties, and its high elongation expands its application range, from building packaging to medical and health care. With the continuous advancement of technology and market competition, the thickness requirements for hose foil in these application fields are decreasing, while the elongation in the performance index is increasing.

[0003] At present, domestic hose foil materials generally use 8011 alloy cast billet, using 80# base oil with ester alcohol composite additives, and the final product performance elongation is about 2-3% after 4 rolling, slitting and annealing. Japanese and Korean companies use hot-rolled 1235 alloy billet, and the final product performance elongation after rolling, slitting and annealing is as high as 4-5%, and they have a high market share in the high-end hose foil market.

[0004] The present invention adopts low-cost 8011 alloy blanks, and after rolling, slitting and annealing, the final product performance elongation is ≧5%, meeting the market requirements of high-end hose foils. Summary of the invention

[0005] In view of the current production status of hose foil, the purpose of the present invention is to disclose a process for producing high-elongation hose foil from 8011 aluminum alloy billet.

[0006] A process for producing high-extension hose foil from 8011 aluminum alloy billet comprises the following steps:

[0007] A. 8011 aluminum alloy billet is annealed at 120-150℃ for 18-20h before rolling, and then cooled naturally to room temperature;

[0008] B. Allocate the pressing amount according to the thickness of the billet; the rolling base oil used is 80# mineral oil, which contains 65% saturated C 12 Alkanes, 35% C 13 -C 14 A saturated alkane mixture, with 7-10% by mass of methyl laurate and lauryl alcohol and 0.15±0.02% of lauric acid added;

[0009] C. Use a circular knife for slitting, and the cutting speed of the moving knife is 6-8% of the slitting and winding speed;

[0010] D. The annealing process uses a high-temperature, short-time performance and segmented degreasing process, and the degreasing sections are arranged on both sides of the high-temperature performance section.

[0011] In the preferred disclosed example of the present invention, after the 8011 aluminum alloy billet in step A is pre-annealed, the tensile strength is reduced from 135-145MPa to below 125MPa, and the elongation is increased from 1.3-1.5% to about 2%.

[0012] In the preferred disclosed example of the present invention, in step B, when the thickness of the blank is 0.3mm, the pass distribution is 0.3mm→0.125mm→0.055mm→0.0245→2×0.012mm, and when the thickness of the blank is 0.26 / 0.24mm, the pass distribution is 0.26 / 0.24mm→0.11mm→0.052mm→0.024mm→2×0.012mm.

[0013] In the preferred disclosed example of the present invention, in step B, the rough rolling pass is mainly composed of alcohol esters supplemented with a small amount of lauric acid to make the total amount 8-10%, and the finishing rolling pass is mainly composed of esters supplemented with a small amount of alcohol and the alcohol amount is within 1.5%, with a total addition amount of 7-9%.

[0014] In the preferred disclosed example of the present invention, in step C, the disc cutter is additionally powered to avoid edge cracking defects; the edge suction method is upper edge suction to avoid the edge of the finished product being damaged due to the swing of the waste edge.

[0015] In the preferred disclosed example of the present invention, in step D, the temperature is raised to 190-195°C for degreasing during the annealing stage, and then annealed at 260-280°C for 10-14h, and then cooled to 190-195°C for degreasing again, which can ensure that the degreasing effect is clean and meets the high elongation performance requirements.

[0016] Beneficial Effects

[0017] The invention uses domestic 8011 alloy billet to produce 0.012mm hose foil. The hose foil billet is annealed before rolling to improve the initial tensile strength and elongation of the billet, so as to change the traditional lubrication process during the rolling process and ensure the product quality. In the slitting process, the traditional blade or butterfly knife cutting process is abandoned and the disc knife combined with the moving knife cutting technology is adopted, so as to achieve a perfect trimming effect and avoid the cracking and breaking of the product. In the annealing process, the traditional annealing process is changed to finally achieve the high elongation performance of the product. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with the embodiments so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments.

[0019] Example 1

[0020] Pretreatment of blanks: Put the blanks into the annealing furnace at room temperature, heat up to 120℃ in 8 hours, keep warm for 10 hours and then take them out of the furnace.

[0021] Oil quality control during rough rolling: alcohol content in additives is 4%, ester content is 3%, acid content is ≤0.15%. 80# base oil, viscosity <2.1mm 2 / s, colloid 1000mg / 100ml, moisture ≤200ppm.

[0022] Oil quality control during medium rolling: alcohol content in additives is 3%, ester content is 5%. 80# base oil, viscosity <2.0mm 2 / s, colloid <800mg / 100ml, and moisture ≤100ppm.

[0023] Oil quality control during finishing rolling: alcohol content in additives <1.5%, ester content 6%. 80# base oil, viscosity <1.95mm 2 / s, colloid <500mg / 100ml, moisture ≤80ppm.

[0024] Working roll control during rolling: the roughness of the rough rolling pass is 0.25μm; the roughness of the intermediate rolling pass is 0.16μm; the roughness of the finished pass is 0.11μm. The roll roughness tolerance is controlled within the range of ±0.02u to reduce the difference in the roughness of the rough rolling, intermediate rolling and finishing rolling rolls.

[0025] Oil temperature control during rolling: rough rolling temperature is 40-42℃, intermediate rolling temperature is 42-45℃, and finishing rolling temperature is 50-55℃.

[0026] Control during slitting: Change the traditional trimming method of razor or disc knife to a small powered circular knife. When the slitting speed is 400m / min, the trimming knife speed is 25m / min and the edge suction direction is upward suction.

[0027] Control during annealing: the furnace temperature is kept consistent with room temperature, and the product enters the furnace at room temperature; the temperature is raised to 80℃ in 10 hours and kept for 2 hours, then the temperature is raised to 190℃ in 5 hours and kept for 20 hours, then the temperature is raised to 280℃ in 2 hours and kept for 10 hours, then the temperature is lowered to 190℃ in 2 hours and kept for 20 hours, and then it is taken out of the furnace.

[0028] Finished product inspection: wetting tension>73×10 -5 N / cm, tensile strength 86Mpa, elongation 5.4%.

[0029] Example 2

[0030] Pretreatment of billets: Put the billets into the annealing furnace at room temperature, heat to 135℃ in 8 hours, keep warm for 10 hours and then take them out of the furnace.

[0031] Oil quality control during rough rolling: alcohol content in additives is 4%, ester content is 4%, acid content is ≤0.15%. 80# base oil, viscosity <2.1mm 2 / s, colloid 1000mg / 100ml, moisture ≤200ppm.

[0032] Oil quality control during medium rolling: alcohol content in additives is 2.5%, ester content is 5.5%. 80# base oil, viscosity <2.0mm 2 / s, colloid <800mg / 100ml, and moisture ≤100ppm.

[0033] Oil quality control during finishing rolling: alcohol content in additives <1.5%, ester content 7%. 80# base oil, viscosity <1.95mm 2 / s, colloid <500mg / 100ml, moisture ≤80ppm.

[0034] Working roll control during rolling: the roughness of the rough rolling pass is 0.25μm; the roughness of the intermediate rolling pass is 0.16μm; the roughness of the finished pass is 0.12μm. The roll roughness tolerance is controlled within the range of ±0.02u to reduce the difference in the roughness of the rough rolling, intermediate rolling and finishing rolling rolls.

[0035] Oil temperature control during rolling: rough rolling temperature is 40-42℃, intermediate rolling temperature is 42-45℃, and finishing rolling temperature is 50-55℃.

[0036] Control during slitting: Change the traditional trimming method of razor or disc knife to a small powered circular knife. When the slitting speed is 500m / min, the trimming knife speed is 40m / min and the edge suction direction adopts the upward suction method.

[0037] Control during annealing: the product enters the furnace at room temperature, heats up to 80℃ for 10 hours, keeps warm for 2 hours, then heats up to 195℃ for 5 hours, keeps warm for 20 hours, then heats up to 270℃ for 2 hours, keeps warm for 10 hours, then cools down to 195℃ for 2 hours, keeps warm for 20 hours, and takes out of the furnace.

[0038] Finished product inspection; wetting tension>72×10 -5 N / cm, tensile strength 90Mpa, elongation 5.5%.

[0039] Example 3

[0040] Pretreatment of blanks: Put the blanks into the annealing furnace at room temperature, heat to 150℃ in 8 hours, keep at this temperature for 10 hours and then take them out of the furnace.

[0041] Oil quality control during rough rolling: alcohol content in additives 4.5%, ester content 4%, acid content ≤ 0.15%. 80# base oil, viscosity < 2.1mm 2 / s, colloid 1000mg / 100ml, moisture ≤200ppm.

[0042] Oil quality control during medium rolling: alcohol content in additives is 3%, ester content is 5.5%. 80# base oil, viscosity <2.0mm 2 / s, colloid <800mg / 100ml, moisture ≤100ppm.

[0043] Oil quality control during finishing rolling: alcohol content in additives <1.5%, ester content 8%. 80# base oil, viscosity <1.95mm 2 / s, colloid <500mg / 100ml, moisture ≤80ppm.

[0044] Working roll control during rolling: the roughness of the rough rolling pass is 0.25μm; the roughness of the intermediate rolling pass is 0.16μm; the roughness of the finished pass is 0.125μm. The roll roughness tolerance is controlled within the range of ±0.02u to reduce the difference in the roughness of the rough rolling, intermediate rolling and finishing rolling rolls.

[0045] Oil temperature control during rolling: rough rolling temperature is 40-42℃, intermediate rolling temperature is 42-45℃, and finishing rolling temperature is 50-55℃.

[0046] Control during slitting: Change the traditional trimming razor or disc knife into a powered small round knife. When the slitting speed is 600m / min, the trimming knife speed is 50m / min and the edge suction direction is upward suction.

[0047] Control during annealing: the product enters the furnace at room temperature, heats up to 80℃ for 10 hours, keeps warm for 2 hours, then heats up to 190℃ for 5 hours, keeps warm for 25 hours, then heats up to 260℃ for 2 hours, keeps warm for 10 hours, then cools down to 190℃ for 2 hours, keeps warm for 25 hours, then takes out of the furnace.

[0048] Finished product inspection: wetting tension>70×10 -5 N / cm, tensile strength 95Mpa, elongation 5.8%.

[0049] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A process for producing high-extension hose foil from 8011 aluminum alloy billet, characterized in that: The steps include: A. 8011 aluminum alloy billet is annealed at 120-150℃ for 18-20h before rolling, and then cooled naturally to room temperature; B. The pressing amount is allocated according to the thickness of the blank. When the blank thickness is 0.3 mm, the pass distribution is 0.3 mm → 0.125 mm → 0.055 mm → 0.0245 → 2 × 0.012 mm. When the blank thickness is 0.26 / 0.24 mm, the pass distribution is 0.26 / 0.24 mm → 0.11 mm → 0.052 mm → 0.024 mm → 2 × 0.012 mm. The rolling base oil used is 80# mineral oil, which contains 65% saturated C 12 Alkanes, 35%C 13 -C 14 A saturated alkane mixture, with 7-10% by mass of methyl laurate and lauryl alcohol and 0.15±0.02% of lauric acid added; C. Cutting is done with a circular knife, and the cutting speed of the moving knife is 6-8% of the cutting and winding speed. The circular knife is equipped with a power drive to avoid edge cracking defects; the edge suction method is upper edge suction; D. The annealing process uses high temperature short-time performance and segmented degreasing technology. The degreasing sections are arranged on both sides of the high temperature short-time performance section. The temperature is raised to 190-195℃ for degreasing during the annealing stage, and then annealed at 260-280℃ for 10-14h, and then cooled to 190-195℃ for degreasing again.

2. The process for producing high-extension hose foil from 8011 aluminum alloy billet according to claim 1, characterized in that: In step A, after the 8011 aluminum alloy billet is pre-annealed, the tensile strength is reduced from 135-145 MPa to below 125 MPa, and the elongation is increased from 1.3-1.5% to about 2%.

3. The process for producing high-extension hose foil from 8011 aluminum alloy billet according to claim 1, characterized in that: In step B, the rough rolling pass uses alcohol esters mixed with a small amount of lauric acid to make the total amount 8-10%, and the finishing rolling pass uses esters as the main material and a small amount of alcohol within 1.5%, with a total addition amount of 7-9%.