CN106541060B - A kind of rolling production method of super-large diameter aluminium alloy integral loop - Google Patents

Abstract

The invention belongs to the technical field of ring rolling, and in particular relates to a rolling production method of a super large-diameter aluminum alloy integral ring. The technical scheme of the present invention adopts ring rolling forming technology, by controlling the rolling deformation temperature, diameter increase rate, radial and axial feed rate, radial and axial reduction, rolling ratio, and core roll diameter of super-large aluminum alloy rings , ring rolling fire, etc., realized the stable and continuous rolling process of super-large-diameter aluminum alloy overall ring, effectively controlled the dimensional accuracy, ellipticity and radial and axial deformation of ring parts, and improved product quality consistency and product qualification rate , meeting the technical specification requirements of the product.

Description

A rolling production method of an ultra-large-diameter aluminum alloy integral ring

technical field

The invention belongs to the technical field of ring rolling, and in particular relates to a rolling production method of a super large-diameter aluminum alloy integral ring.

Background technique

Large rings are widely used in various industrial fields, such as bearing rings and gear ring blanks for wind power equipment, transition rings for launch vehicles, pressure vessels and reinforcement rings for nuclear reactors, etc. In recent years, with the development of industry, the demand for large-scale rings in various industries is increasing, and the performance requirements are also getting higher and higher. Therefore, it is particularly important to study the manufacturing process of large-scale rings.

Roll forming of the integral ring belongs to the forging process of radial-axial compression and tangential extension, including: linear feed motion, rotary rolling motion, guiding motion, and the rotation and diameter expansion motion of the ring itself, which makes the control ring The roll forming process is extremely complex. The extra-large ring forgings produced by this technology not only have the characteristics of high precision of external dimensions and less material consumption, but also can effectively improve the internal structure and uniformity of the material. The metal fibers are arranged continuously along the circumference, which is incompatible with the stress and wear of the parts. Compatible, with excellent internal quality and high comprehensive performance. At the same time, the integral forged ring is an integral machined part, so the large integral ring rolled forming part has high dimensional accuracy, good quality consistency, good stability, and high reliability.

At present, many domestic units have successfully rolled 2219 aluminum alloy rings with a diameter of 5 meters, and have been widely used in the aerospace field, but aluminum alloy rings with a diameter of more than 5 meters are still blank in China. With the further increase of the size of the ring, especially when the diameter is greater than 8m, the rigidity of the ring is greatly weakened, and plastic instability is prone to occur during the rolling process, making it difficult to control the roundness and dimensional accuracy of the ring during the ring rolling process; At the same time, due to the large cross-section of large rings, defects such as folding, sticking, surface peeling, and polygons are prone to occur during the ring rolling process, resulting in termination of the ring rolling process or product scrap, so the rolling process is more complicated. Higher requirements are also put forward for the control of the rolling process.

Therefore, the precise control of the forming process of super-large-diameter overall rings and the realization of the "shape-performance" collaborative control of Φ8-10m ring products will greatly promote the improvement of the rolling technology level of domestic super-large-diameter rings, and become my country's An important technology that needs to be solved urgently in this technical field.

Contents of the invention

The technical problem to be solved by the present invention is to realize the rolling forming of the super large diameter aluminum alloy integral ring of Φ8-10m, control the roundness and dimensional accuracy of the ring, and ensure the stable and continuous rolling process of the ring. The "shape-property" coordinated control can meet the use requirements of super large diameter integral rings in my country.

In order to realize this object, the technical scheme that the present invention takes is:

A rolling production method of an ultra-large-diameter aluminum alloy integral ring, comprising the steps of:

(1) Ring blank preparation: Prepare ring blanks of required specifications by free forging, and carry out lathe processing and ultrasonic flaw detection to ensure qualified ring rolling blanks;

Forging process: free forging to obtain ring blanks with an outer diameter of 3500-4500mm, an inner diameter of 3000-3500mm, and a height of 500-650mm;

Turning processing: Carry out turning processing on the upper and lower end faces of the ring blank, as well as the inner and outer circular faces, remove the black skin and fold damage on the surface, the surface roughness should reach Ra3.2 or more, and the roundness should be controlled within 1mm;

Ultrasonic flaw detection: 100% ultrasonic flaw detection is carried out on the upper end surface of the billet, and it is accepted according to the GJB2057 standard A level, and the defects exceeding the standard are excluded;

(2) Ring billet heating: the ring rolling billet is heated and kept warm in an electric furnace;

(3) Ring rolling forming: carry out secondary ring rolling forming on the ring rolling billet; including:

(3.1) Transfer: transfer the heated ring rolling billet to the ring rolling mill, the transfer time is less than 290s, and the temperature drop on the billet surface is controlled within 40°C;

(3.2) The first fire rolling: use core rolls with a diameter of 400-600mm to roll the ring-rolled billet until the outer diameter of the ring-rolled billet is 5000-6000mm and the height is 450-600mm, and the rolling ratio is 1.2～2.0, the ratio of radial to axial reduction is 2.0～3.0;

The rolling process is divided into five stages: biting stage, rapid rolling stage, stable rolling stage, deceleration rolling stage and forming full circle stage:

Biting stage: the ring rolling billet bites into the roll gap, and the rolling process starts to be established. In this stage, only radial rolling is carried out, and the axial roll has no feed. The rolling thickness value in the initial stage is 5% of the change in the entire rolling thickness; at this stage, the initial diameter increase rate is 1-3mm/s, the final diameter increase rate is 3-5mm/s, and the radial feed rate 0.02～0.06mm/s, axial feed rate 0～0.02mm/s;

Rapid rolling stage: the radial feed speed of the rolls is accelerated, and the ring rolling billet grows rapidly accordingly, the axial feed is fed in proportion to the radial feed, and the rolling thickness value of the rapid rolling stage is 15% of the thickness change; at this stage, the initial diameter increase rate is 3-5mm/s, the final diameter increase rate is 5-12mm/s, the radial feed rate is 0.06-0.3mm/s, the axial The feed rate is 0.02～0.15mm/s;

Stable rolling stage: control the feed speed of the core roll and the tapered roll to match the diameter growth rate of the ring rolling billet, so that the rolling process can be carried out quickly and stably. 60% of the thickness change; at this stage, the initial diameter increase rate is 5-12mm/s, the final diameter increase rate is 5-12mm/s, the radial feed rate is 0.15-0.4mm/s, the axial The feed rate is 0.04～0.2mm/s;

Deceleration rolling stage: The radial and axial feed speeds decrease, and the growth rate of the ring rolling billet decreases accordingly. The rolling thickness value in the deceleration rolling stage is 10% of the variation of the entire rolling thickness; the diameter at this stage The initial increase rate is 5-12mm/s, the final diameter increase rate is 1-5mm/s, the radial feed rate is 0.05-0.4mm/s, and the axial feed rate is 0.02-0.15mm/s;

Forming full circle stage: only radial rolling is carried out, and the widening caused by radial rolling is only rolled in the axial direction, and the full circle is carried out in the process of only radial rolling, and the dimensional error caused by springback is eliminated at the same time , the rolling thickness value in the full-circle forming stage is 10% of the variation of the entire rolling thickness; The feed rate is 0.02-0.05mm/s, and the axial feed rate is 0-0.02mm/s;

(3.3) Return to the furnace for heat preservation for 2 to 4 hours, and the heat preservation temperature is 420 to 460 °C;

(3.4) Second fire rolling: Change the core roll with a diameter of 700-900mm to roll the ring-rolled billet until the outer diameter is 8000-10000mm, the height is 400-550mm, and the rolling ratio is 1.2-1.8. The ratio of radial to axial reduction is 2.0 to 3.0;

The rolling process is the same as step (3.2), and it is divided into five stages: biting stage, rapid rolling stage, stable rolling stage, deceleration rolling stage and forming full circle stage:

Biting stage: the ring rolling billet bites into the roll gap, and the rolling process starts to be established. In this stage, only radial rolling is carried out, and the axial roll has no feed. The rolling thickness value in the initial stage is 5% of the change in the entire rolling thickness; at this stage, the initial diameter increase rate is 1-3mm/s, the final diameter increase rate is 3-8mm/s, and the radial feed rate 0.02～0.08mm/s, axial feed rate 0～0.02mm/s;

Rapid rolling stage: the radial feed speed of the rolls is accelerated, and the ring rolling billet grows rapidly accordingly, the axial feed is fed in proportion to the radial feed, and the rolling thickness value of the rapid rolling stage is 15% of the thickness change; at this stage, the initial diameter increase rate is 3-8mm/s, the final diameter increase rate is 8-15mm/s, the radial feed rate is 0.08-0.35mm/s, the axial The feed rate is 0.04～0.15mm/s;

Stable rolling stage: control the feed speed of the core roll and the tapered roll to match the diameter growth rate of the ring rolling billet, so that the rolling process can be carried out quickly and stably. 60% of the thickness change; at this stage, the initial diameter increase rate is 8-15mm/s, the final diameter increase rate is 8-15mm/s, the radial feed rate is 0.15-0.5mm/s, the axial The feed rate is 0.08～0.3mm/s;

Deceleration rolling stage: The radial and axial feed speeds decrease, and the growth rate of the ring rolling billet decreases accordingly. The rolling thickness value in the deceleration rolling stage is 10% of the variation of the entire rolling thickness; the diameter at this stage The initial increase rate is 8-15mm/s, the final diameter increase rate is 1-5mm/s, the radial feed rate is 0.05-0.5mm/s, and the axial feed rate is 0.02-0.2mm/s;

Forming full circle stage: only radial rolling is carried out, and the widening caused by radial rolling is only rolled in the axial direction, and the full circle is carried out in the process of only radial rolling, and the dimensional error caused by springback is eliminated at the same time , the rolling thickness value in the full-circle forming stage is 10% of the variation of the entire rolling thickness; The feed rate is 0.02-0.05mm/s, and the axial feed rate is 0-0.02mm/s;

(3.5) Cool the ring in a closed environment after rolling, and control the cooling rate of each part to be consistent during the cooling process;

(4) Dimensional inspection: carry out dimension inspection on rings formed by ring rolling to obtain rings that meet quality requirements.

Furthermore, in the above-mentioned method for rolling a super large-diameter aluminum alloy monolithic ring, in step (2), the ring-rolled billet is put into an electric furnace, and the heating temperature is 420-460°C by adopting the heating method with the furnace. The holding time is 12-12.5 hours.

Further, the rolling production method of a super-large-diameter aluminum alloy integral ring as described above, in step (3), the rolling process is for the main roll, the core roll, the upper cone roll, the lower cone roll, and the ring blank. The corner parts are lubricated, the lubrication of each part is controlled uniformly, and the surface temperature of the ring blank is controlled at 360-460 °C.

Further, in the rolling production method of an ultra-large-diameter aluminum alloy integral ring as described above, in step (4), the quality requirement for dimension inspection of the turned ring is that the roundness of the ring is ≤ 5‰.

The technical scheme of the present invention adopts ring rolling forming technology, by controlling the rolling deformation temperature, diameter increase rate, radial and axial feed rate, radial and axial reduction, rolling ratio, and core roll diameter of super-large aluminum alloy rings , ring rolling fire, etc., realized the stable and continuous rolling process of super-large-diameter aluminum alloy overall ring, effectively controlled the dimensional accuracy, ellipticity and radial and axial deformation of ring parts, and improved product quality consistency and product qualification rate , meeting the technical specification requirements of the product.

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments.

A rolling production method of an ultra-large-diameter aluminum alloy integral ring of the present invention comprises the following steps:

(1) Ring blank preparation: Prepare ring blanks of required specifications by free forging, and carry out lathe processing and ultrasonic flaw detection to ensure qualified ring rolling blanks;

Forging process: free forging to obtain ring blanks with an outer diameter of 3500-4500mm, an inner diameter of 3000-3500mm, and a height of 500-650mm;

Turning processing: Carry out turning processing on the upper and lower end faces of the ring blank, as well as the inner and outer circular faces, remove the black skin and fold damage on the surface, the surface roughness should reach Ra3.2 or more, and the roundness should be controlled within 1mm;

Ultrasonic flaw detection: 100% ultrasonic flaw detection is carried out on the upper end surface of the billet, and it is accepted according to the GJB2057 standard A level, and the defects exceeding the standard are excluded;

(2) Ring billet heating: heat and keep the ring rolling billet in an electric furnace; the preferred technical solution is to put the ring rolling billet into the electric furnace, adopt the heating method with the furnace, the heating temperature is 420-460 °C, and the holding time is 12～12.5h.

(3) Ring rolling forming: carry out secondary ring rolling forming on the ring rolling billet; including:

(3.1) Transfer: transfer the heated ring rolling billet to the ring rolling mill, the transfer time is less than 290s, and the temperature drop on the billet surface is controlled within 40°C;

(3.2) The first fire rolling: use core rolls with a diameter of 400-600mm to roll the ring-rolled billet until the outer diameter of the ring-rolled billet is 5000-6000mm and the height is 450-600mm, and the rolling ratio is 1.2～2.0, the ratio of radial to axial reduction is 2.0～3.0;

The rolling process is divided into five stages: biting stage, rapid rolling stage, stable rolling stage, deceleration rolling stage and forming full circle stage:

Biting stage: the ring rolling billet bites into the roll gap, and the rolling process starts to be established. In this stage, only radial rolling is carried out, and the axial roll has no feed. The rolling thickness value in the initial stage is 5% of the change in the entire rolling thickness; at this stage, the initial diameter increase rate is 1-3mm/s, the final diameter increase rate is 3-5mm/s, and the radial feed rate 0.02～0.06mm/s, axial feed rate 0～0.02mm/s;

Rapid rolling stage: the radial feed speed of the rolls is accelerated, and the ring rolling billet grows rapidly accordingly, the axial feed is fed in proportion to the radial feed, and the rolling thickness value of the rapid rolling stage is 15% of the thickness change; at this stage, the initial diameter increase rate is 3-5mm/s, the final diameter increase rate is 5-12mm/s, the radial feed rate is 0.06-0.3mm/s, the axial The feed rate is 0.02～0.15mm/s;

Stable rolling stage: control the feed speed of the core roll and the tapered roll to match the diameter growth rate of the ring rolling billet, so that the rolling process can be carried out quickly and stably. 60% of the thickness change; at this stage, the initial diameter increase rate is 5-12mm/s, the final diameter increase rate is 5-12mm/s, the radial feed rate is 0.15-0.4mm/s, the axial The feed rate is 0.04～0.2mm/s;

Deceleration rolling stage: The radial and axial feed speeds decrease, and the growth rate of the ring rolling billet decreases accordingly. The rolling thickness value in the deceleration rolling stage is 10% of the variation of the entire rolling thickness; the diameter at this stage The initial increase rate is 5-12mm/s, the final diameter increase rate is 1-5mm/s, the radial feed rate is 0.05-0.4mm/s, and the axial feed rate is 0.02-0.15mm/s;

Forming full circle stage: only radial rolling is carried out, and the widening caused by radial rolling is only rolled in the axial direction, and the full circle is carried out in the process of only radial rolling, and the dimensional error caused by springback is eliminated at the same time , the rolling thickness value in the full-circle forming stage is 10% of the variation of the entire rolling thickness; The feed rate is 0.02-0.05mm/s, and the axial feed rate is 0-0.02mm/s;

(3.3) Return to the furnace for heat preservation for 2 to 4 hours, and the heat preservation temperature is 420 to 460 °C;

(3.4) Second fire rolling: Change the core roll with a diameter of 700-900mm to roll the ring-rolled billet until the outer diameter is 8000-10000mm, the height is 400-550mm, and the rolling ratio is 1.2-1.8. The ratio of radial to axial reduction is 2.0 to 3.0;

The rolling process is the same as step (3.2), and it is divided into five stages: biting stage, rapid rolling stage, stable rolling stage, deceleration rolling stage and forming full circle stage:

Biting stage: the ring rolling billet bites into the roll gap, and the rolling process starts to be established. In this stage, only radial rolling is carried out, and the axial roll has no feed. The rolling thickness value in the initial stage is 5% of the change in the entire rolling thickness; at this stage, the initial diameter increase rate is 1-3mm/s, the final diameter increase rate is 3-8mm/s, and the radial feed rate 0.02～0.08mm/s, axial feed rate 0～0.02mm/s;

Rapid rolling stage: the radial feed speed of the rolls is accelerated, and the ring rolling billet grows rapidly accordingly, the axial feed is fed in proportion to the radial feed, and the rolling thickness value of the rapid rolling stage is 15% of the thickness change; at this stage, the initial diameter increase rate is 3-8mm/s, the final diameter increase rate is 8-15mm/s, the radial feed rate is 0.08-0.35mm/s, the axial The feed rate is 0.04～0.15mm/s;

Stable rolling stage: control the feed speed of the core roll and the tapered roll to match the diameter growth rate of the ring rolling billet, so that the rolling process can be carried out quickly and stably. 60% of the thickness change; at this stage, the initial diameter increase rate is 8-15mm/s, the final diameter increase rate is 8-15mm/s, the radial feed rate is 0.15-0.5mm/s, the axial The feed rate is 0.08～0.3mm/s;

Deceleration rolling stage: The radial and axial feed speeds decrease, and the growth rate of the ring rolling billet decreases accordingly. The rolling thickness value in the deceleration rolling stage is 10% of the variation of the entire rolling thickness; the diameter at this stage The initial increase rate is 8-15mm/s, the final diameter increase rate is 1-5mm/s, the radial feed rate is 0.05-0.5mm/s, and the axial feed rate is 0.02-0.2mm/s;

Forming full circle stage: only radial rolling is carried out, and the widening caused by radial rolling is only rolled in the axial direction, and the full circle is carried out in the process of only radial rolling, and the dimensional error caused by springback is eliminated at the same time , the rolling thickness value in the full-circle forming stage is 10% of the variation of the entire rolling thickness; The feed rate is 0.02-0.05mm/s, and the axial feed rate is 0-0.02mm/s;

(3.5) Cool the ring in a closed environment after rolling, and control the cooling rate of each part to be consistent during the cooling process;

The preferred technical solution is that in step (3), the rolling process lubricates the four corners of the main roll, the core roll, the upper cone roll, the lower cone roll, and the ring blank, and controls the lubrication of each position to be uniform, and the control ring The surface temperature of the blank is 360-460°C.

(4) Dimensional inspection: carry out dimension inspection on rings formed by ring rolling to obtain rings that meet quality requirements. The specific quality requirement for dimensional inspection of ring parts after turning is that the roundness of the ring parts is ≤5‰.

The overall rolling process requires the ring to have a certain overall rigidity and roundness in order to ensure the smooth progress of the rolling process. The overall rigidity of the large-diameter thin-walled aluminum alloy ring is very weak, and further decreases with the increase of the instantaneous diameter of the ring. During the rolling process, the latter part is prone to plastic instability and loses the overall roundness, resulting in the rolling process. Unable to continue, or the ovality is out of tolerance to produce waste. In particular, the larger the diameter and the heavier the quality of the ring, the more difficult it is to control the stability of the rolling process, and the higher the requirements for the control of the ring rolling process. Therefore, on the basis of ensuring product performance, control the ring rolling process. Stability is a key technology in the rolling production of super large diameter aluminum alloy monolithic rings. Ring forming process parameters have a very important impact on the smooth progress of the ring forging rolling process and the final forming quality, so the process parameters in each stage of ring rolling forming must be reasonably allocated and accurately controlled. The invention provides a rolling production method of a super-large-diameter aluminum alloy integral ring, which solves the problems of precise control of roundness and size, control of rolling defects, and control of product performance during the rolling process of super-large-diameter aluminum alloy rings. The "shape-property" coordinated control of the super-large-diameter aluminum alloy integral ring is realized, and the performance requirements of the integral ring are met.

The rolling production method of a super-large-diameter aluminum alloy monolithic ring provided by the present invention will be specifically described below through examples.

Example 1

A ring rolling billet with an outer diameter of 3965 mm, an inner diameter of 3224 mm and a height of 575 mm was prepared by free forging. After turning and passing the flaw detection inspection, it was placed in an electric furnace and heated with the furnace at a heating temperature of 445 °C and a holding time of 12 hours.

Transfer the heated ring rolling billet to the ring rolling mill and use the Φ500mm core roll for the first fire ring rolling. The ring is rolled to an outer diameter of 5130mm and a height of 510mm, and then it is returned to the furnace for heat preservation. The heat preservation temperature is 446°C and the heat preservation time is 2.1h; The Φ800 core roll is used for the second fire ring rolling. The rolling process parameters are shown in the table below. The ring is rolled to an outer diameter of 8760mm, an inner diameter of 8379mm and a height of 470mm. The rolling process parameters are shown in the table below.

After size measurement, the roundness of the ring is 19mm, less than 5‰, which meets the requirements of technical indicators.

Example 2

The ring rolling billet with an outer diameter of 4100mm, an inner diameter of 3300mm and a height of 550mm is cleaned and inspected for flaws, and then placed in an electric furnace to be heated with the furnace at a heating temperature of 440°C and a holding time of 12.2h.

Transfer the heated ring rolling blank to the ring rolling mill and use the Φ500mm core roll for the first fire ring rolling, rolling the ring to an outer diameter of 5800mm and a height of 500mm, and then return it to the furnace for heat preservation at a heat preservation temperature of 446°C and a heat preservation time of 2.1h; The Φ800 core roll is used for the second fire ring rolling. The rolling process is shown in the table below. The ring is rolled to an outer diameter of 9205mm, an inner diameter of 8812mm and a height of 460mm. The rolling process parameters are shown in the table below.

After size measurement, the roundness of the ring is 35mm, which is less than 5‰, which meets the requirements of technical indicators.

Claims (4)

1. a rolling production method of an ultra-large diameter aluminum alloy monolithic ring, is characterized in that, comprises the steps: (1) Preparation of ring rolling blanks: Prepare ring rolling blanks of required specifications by free forging, and carry out lathe processing and ultrasonic flaw detection to ensure that qualified ring rolling blanks are obtained; Forging process: free forging method to obtain ring rolling blanks with an outer diameter of 3500-4500mm, an inner diameter of 3000-3500mm, and a height of 500-650mm; Turning: Carry out turning on the upper and lower end surfaces and the inner and outer circular surfaces of the ring rolling billet to remove the black skin and fold damage on the surface, the surface roughness should reach Ra3.2 or more, and the roundness should be controlled within 1mm; Ultrasonic flaw detection: 100% ultrasonic flaw detection is carried out on the upper end surface of the billet, and it is accepted according to the GJB2057 standard A level, and the defects exceeding the standard are excluded; (2) Ring rolling billet heating: the ring rolling billet is heated and kept warm in an electric furnace; (3) Ring rolling forming: carry out secondary ring rolling forming on the ring rolling billet; including: (3.1) Transfer: transfer the heated ring rolling billet to the ring rolling mill, the transfer time is less than 290s, and the temperature drop on the billet surface is controlled within 40°C; (3.2) The first fire rolling: use core rolls with a diameter of 400-600mm to roll the ring-rolled billet until the outer diameter of the ring-rolled billet is 5000-6000mm and the height is 450-600mm, and the rolling ratio is 1.2～2.0, the ratio of radial to axial reduction is 2.0～3.0; The rolling process is divided into five stages: biting stage, rapid rolling stage, stable rolling stage, deceleration rolling stage and forming full circle stage: Biting stage: the ring rolling billet bites into the roll gap, and the rolling process starts to be established. In this stage, only radial rolling is carried out, and the axial roll has no feed. The rolling thickness value in the initial stage is 5% of the change in the entire rolling thickness; at this stage, the initial diameter increase rate is 1-3mm/s, the final diameter increase rate is 3-5mm/s, and the radial feed rate 0.02～0.06mm/s, axial feed rate 0～0.02mm/s; Rapid rolling stage: the radial feed speed of the rolls is accelerated, and the ring rolling billet grows rapidly accordingly, the axial feed is fed in proportion to the radial feed, and the rolling thickness value of the rapid rolling stage is 15% of the thickness change; at this stage, the initial diameter increase rate is 3-5mm/s, the final diameter increase rate is 5-12mm/s, the radial feed rate is 0.06-0.3mm/s, the axial The feed rate is 0.02～0.15mm/s; Stable rolling stage: control the feed speed of the core roll and the tapered roll to match the diameter growth rate of the ring rolling billet, so that the rolling process can be carried out quickly and stably. 60% of the thickness change; at this stage, the initial diameter increase rate is 5-12mm/s, the final diameter increase rate is 5-12mm/s, the radial feed rate is 0.15-0.4mm/s, the axial The feed rate is 0.04～0.2mm/s; Deceleration rolling stage: The radial and axial feed speeds decrease, and the growth rate of the ring rolling billet decreases accordingly. The rolling thickness value in the deceleration rolling stage is 10% of the variation of the entire rolling thickness; the diameter at this stage The initial increase rate is 5-12mm/s, the final diameter increase rate is 1-5mm/s, the radial feed rate is 0.05-0.4mm/s, and the axial feed rate is 0.02-0.15mm/s; Forming full circle stage: only radial rolling is carried out, and the widening caused by radial rolling is only rolled in the axial direction, and the full circle is carried out in the process of only radial rolling, and the dimensional error caused by springback is eliminated at the same time , the rolling thickness value in the forming full circle stage is 10% of the variation of the entire rolling thickness; The feed rate is 0.02-0.05mm/s, and the axial feed rate is 0-0.02mm/s; (3.3) Return to the furnace for heat preservation for 2 to 4 hours, and the heat preservation temperature is 420 to 460 °C; (3.4) Second fire rolling: Change the core roll with a diameter of 700-900mm to roll the ring-rolled billet until the outer diameter is 8000-10000mm, the height is 400-550mm, and the rolling ratio is 1.2-1.8. The ratio of radial to axial reduction is 2.0 to 3.0; The rolling process is the same as step (3.2), and it is divided into five stages: biting stage, rapid rolling stage, stable rolling stage, deceleration rolling stage and forming full circle stage: Biting stage: the ring rolling billet bites into the roll gap, and the rolling process starts to be established. In this stage, only radial rolling is carried out, and the axial roll has no feed. The rolling thickness value in the initial stage is 5% of the change in the entire rolling thickness; at this stage, the initial diameter increase rate is 1-3mm/s, the final diameter increase rate is 3-8mm/s, and the radial feed rate 0.02～0.08mm/s, axial feed rate 0～0.02mm/s; Rapid rolling stage: the radial feed speed of the rolls is accelerated, and the ring rolling billet grows rapidly accordingly, the axial feed is fed in proportion to the radial feed, and the rolling thickness value of the rapid rolling stage is 15% of the thickness change; at this stage, the initial diameter increase rate is 3-8mm/s, the final diameter increase rate is 8-15mm/s, the radial feed rate is 0.08-0.35mm/s, the axial The feed rate is 0.04～0.15mm/s; Stable rolling stage: control the feed speed of the core roll and the tapered roll to match the diameter growth rate of the ring rolling billet, so that the rolling process can be carried out quickly and stably. 60% of the thickness change; at this stage, the initial diameter increase rate is 8-15mm/s, the final diameter increase rate is 8-15mm/s, the radial feed rate is 0.15-0.5mm/s, the axial The feed rate is 0.08～0.3mm/s; Deceleration rolling stage: The radial and axial feed speeds decrease, and the growth rate of the ring rolling billet decreases accordingly. The rolling thickness value in the deceleration rolling stage is 10% of the variation of the entire rolling thickness; the diameter at this stage The initial increase rate is 8-15mm/s, the final diameter increase rate is 1-5mm/s, the radial feed rate is 0.05-0.5mm/s, and the axial feed rate is 0.02-0.2mm/s; Forming full circle stage: only radial rolling is carried out, and the widening caused by radial rolling is only rolled in the axial direction, and the full circle is carried out in the process of only radial rolling, and the dimensional error caused by springback is eliminated at the same time , the rolling thickness value in the forming full circle stage is 10% of the variation of the entire rolling thickness; The feed rate is 0.02-0.05mm/s, and the axial feed rate is 0-0.02mm/s; (3.5) Cool the ring in a closed environment after rolling, and control the cooling rate of each part to be consistent during the cooling process; (4) Dimensional inspection: carry out dimension inspection on rings formed by ring rolling to obtain rings that meet quality requirements. 2. The rolling production method of a super-large-diameter aluminum alloy monolithic ring as claimed in claim 1, characterized in that: in step (2), the ring-rolled billet is put into an electric furnace, and the heating method with the furnace is adopted, and the heating temperature The temperature is 420～460℃, and the holding time is 12～12.5h. 3. the rolling production method of a kind of super large-diameter aluminum alloy integral ring as claimed in claim 1, is characterized in that: in step (3), rolling process is to main roll, mandrel roll, upper tapered roll, lower tapered roll 1. Lubricate the four corners of the ring-rolled billet, control the lubrication of each part to be uniform, and control the surface temperature of the ring-rolled billet at 360-460°C. 4. the rolling production method of a kind of super large-diameter aluminum alloy integral ring as claimed in claim 1, is characterized in that: in step (4), the quality requirement that the ring piece after lathing is carried out dimensional inspection is ring piece circle Degree ≤ 5‰.