A precision ring forging of aluminum alloy and its preparation method

Abstract

The present invention relates to the technical field of forging manufacturing, and particularly relates to an aluminum alloy precision ring forging and a preparation method thereof, including: cutting a blank from an aluminum alloy bar; sequentially heating, upsetting, and punching the blank to prepare an aluminum alloy ring rolling blank; obtaining the size information of the aluminum alloy ring rolling blank and the design size information of the alloy precision ring forging; determining the ring rolling method of the aluminum alloy ring rolling blank as a synchronous ring rolling method or an asynchronous ring rolling method according to the size evaluation coefficient; when it is initially determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the standard according to the first ring rolling end face characteristic value, determining whether the ring rolling of the aluminum alloy ring rolling blank meets the standard according to the crack characteristic value, or reducing the reduction per revolution of the next preset length segment; when it is determined that the preparation of the ring forging does not meet the standard according to the second ring rolling end face characteristic value, reducing the ring rolling rate of the next preset thickness segment; cooling and packaging the qualified aluminum alloy precision ring forging, improving the quality of the prepared ring forging.

Description

Technical Field

[0001] The present invention relates to the technical field of forging manufacturing, and particularly relates to an aluminum alloy precision ring forging and a preparation method thereof. Background Art

[0002] The aluminum alloy precision ring forging is a ring forging made of aluminum alloy material through precision forging process, and its manufacturing process includes steps such as raw material preparation, heating, forging, heat treatment, trimming and surface treatment. The aluminum alloy precision ring forging has been widely used in many fields such as aerospace, automobiles, mechanical equipment, unmanned aerial vehicles and bicycles due to its characteristics such as high strength, light weight, corrosion resistance, high precision and good surface quality, and higher requirements are also put forward for the preparation quality of the aluminum alloy precision ring forging.

[0003] The wavy defect is a common surface defect in the manufacturing and processing of ring forgings. It appears as a wavy or uneven morphology at the bottom of the inner wall surface of the ring forging, which affects the preparation quality of the aluminum alloy precision ring forging.

[0004] Chinese Patent Publication No.: CN118253688A discloses a manufacturing method of an aerospace aluminum alloy ring forging, including eight steps: blanking, first heating and heat preservation, upsetting and forging, second heating and heat preservation, drawing and expanding the hole, third heating and heat preservation, ring rolling, appearance and performance inspection. By reasonably setting the forging temperature and forging time of each heating, high-strength aluminum alloy forging blanks can be obtained with a sufficient small number of forging heats, thereby reducing the production cost of the aluminum alloy forging blanks, effectively reducing the waste of raw materials and energy, saving production man-hours, and effectively improving production efficiency. It can be seen that the above technical solution lacks necessary detection means for the ring rolling process, resulting in the problem of low preparation quality of the ring forging. Summary of the Invention

[0005] Therefore, the present invention provides an aluminum alloy precision ring forging and a preparation method thereof to overcome the problem that the necessary detection means for the ring rolling process are lacking in the prior art, resulting in low preparation quality of the ring forging.

[0006] To achieve the above object, on the one hand, the present invention provides a preparation method of an aluminum alloy precision ring forging, including:

[0007] Cutting a blank from an aluminum alloy bar.

[0008] Successively heating, upsetting and punching the blank to prepare an aluminum alloy ring rolling blank.

[0009] Obtain the dimensional information of the aluminum alloy ring rolling blank and the designed dimensional information of the precision alloy ring forging, and calculate the dimensional evaluation coefficient. Among them, the dimensional information of the aluminum alloy ring rolling blank includes the wall thickness and height of the aluminum alloy ring rolling blank, and the designed dimensional information of the precision alloy ring forging includes the designed wall thickness and designed height of the precision alloy ring forging;

[0010] Determine the ring rolling method of the aluminum alloy ring rolling blank according to the dimensional evaluation coefficient. Among them, the ring rolling method includes synchronous ring rolling method and asynchronous ring rolling method;

[0011] Complete the ring rolling of the first preset length section of the aluminum alloy ring rolling blank under the asynchronous ring rolling method, obtain the deformation size of the ring rolling end face, and then calculate the first ring rolling end face characteristic value;

[0012] When it is initially determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard according to the first ring rolling end face characteristic value, re-determine whether the ring rolling of the aluminum alloy ring rolling blank meets the standard according to the crack characteristic value, or reduce the reduction per revolution of the next preset length section;

[0013] Complete the ring rolling of the first preset thickness section of the aluminum alloy ring rolling blank under the synchronous ring rolling method, obtain the ring forging, and respectively obtain the dimensional information of the upper end face and the lower end face of the ring forging, and then calculate the second ring rolling end face characteristic value;

[0014] When it is determined that the preparation of the ring forging does not meet the preset standard according to the second ring rolling end face characteristic value, reduce the ring rolling speed of the next preset thickness section;

[0015] Cool and package the precision aluminum alloy ring forgings that meet the preset standards.

[0016] Furthermore, determine the ring rolling method of the aluminum alloy ring rolling blank according to the dimensional evaluation coefficient, where

[0017] If the dimensional evaluation coefficient is less than the preset dimensional threshold, the synchronous ring rolling method is adopted;

[0018] If the dimensional evaluation coefficient is greater than or equal to the preset dimensional threshold, the asynchronous ring rolling method is adopted;

[0019] The dimensional evaluation coefficient is jointly determined according to the wall thickness of the aluminum alloy ring rolling blank, the height of the aluminum alloy ring rolling blank, the designed wall thickness of the precision alloy ring forging, and the designed height of the precision alloy ring forging.

[0020] Furthermore, the process of determining that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard according to the first ring rolling end face characteristic value includes:

[0021] Compare the first ring rolling end face characteristic value with the first preset ring rolling threshold value and the second preset ring rolling threshold value respectively;

[0022] If the first ring rolling end face characteristic value is greater than or equal to the first preset ring rolling threshold value and less than the second preset ring rolling threshold value, it is determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard, and the aluminum alloy ring rolling blank with a ring rolling length of the first preset length is continuously ring rolled to the second preset length section and the ring rolling of the aluminum alloy ring rolling blank is re - judged according to the crack characteristic value whether it meets the standard;

[0023] If the first ring rolling end face characteristic value is greater than or equal to the second preset ring rolling threshold value, it is determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard, and the per - revolution reduction amount of the next preset length section is reduced according to the difference between the first ring rolling end face characteristic value and the second preset ring rolling threshold value.

[0024] Furthermore, the process of obtaining the first ring rolling end face characteristic value includes:

[0025] Under the condition that the aluminum alloy ring rolling blank is ring rolled to the first length section, use a profile measuring instrument to measure the profile of the end face of the aluminum alloy ring rolling blank to obtain the peak value of each waveform;

[0026] Calculate the average value of the peak values, denoted as the first ring rolling end face characteristic value.

[0027] Furthermore, there are several reduction methods for setting the per - revolution reduction amount of the next preset length section, and each reduction method has a different reduction amplitude for the per - revolution reduction amount of the next preset length section.

[0028] Furthermore, re - judge whether the ring rolling of the aluminum alloy ring rolling blank meets the standard according to the crack characteristic value, where

[0029] If the crack characteristic value is less than the preset crack characteristic value, it is determined that the ring rolling of the aluminum alloy ring rolling blank meets the standard;

[0030] If the crack characteristic value is greater than or equal to the preset crack characteristic value, it is determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the standard, and the ring rolling temperature of the aluminum alloy ring rolling blank is reduced according to the difference between the crack characteristic value and the preset crack characteristic value;

[0031] The crack characteristic value is the ratio of the total crack length on the inner wall of the preset junction area between the first preset length section and the second preset length section to the preset crack length under the condition that the aluminum alloy ring rolling blank is ring rolled to the second preset length section.

[0032] Furthermore, the increase amplitude of the ring rolling temperature is positively correlated with the crack difference, where the crack difference is the difference between the crack characteristic value and the preset crack characteristic value.

[0033] Further, the process of determining that the preparation of the ring forging does not meet the preset standard according to the second ring rolling end face characteristic value includes:

[0034] Compare the second ring rolling end face characteristic value with a preset end face threshold value.

[0035] If the second ring rolling end face characteristic value is greater than or equal to the preset end face threshold value, it is determined that the preparation of the ring forging does not meet the preset standard, and the ring rolling speed is reduced according to the difference between the second ring rolling end face characteristic value and the preset end face threshold value.

[0036] Further, the process of obtaining the second ring rolling end face characteristic value includes:

[0037] Ring roll the aluminum alloy ring rolling blank in the synchronous ring rolling mode to obtain a ring forging.

[0038] Use a profile measuring instrument to measure the peak values of each waveform of the wavy defects on the upper end face and the lower end face of the inner wall of the ring forging respectively.

[0039] Calculate the average value of the peak values, which is recorded as the second ring rolling end face characteristic value.

[0040] On the other hand, the present invention also provides an aluminum alloy precision ring forging, characterized in that the ratio of the length of the aluminum alloy precision ring forging to the outer diameter of the aluminum alloy precision ring forging is greater than 0.8.

[0041] Compared with the prior art, the beneficial effects of the present invention are that the present invention determines the ring rolling mode of the aluminum alloy ring rolling blank through a size evaluation coefficient, and the ring rolling mode includes a synchronous ring rolling mode and an asynchronous ring rolling mode; the ring rolling effect of the aluminum alloy ring rolling blank in the asynchronous ring rolling mode is inspected according to the first ring rolling end face characteristic value and the crack characteristic value and corresponding adjustments are made; the preparation effect of the aluminum alloy ring rolling blank in the synchronous ring rolling mode is verified according to the second ring rolling end face characteristic value and corresponding adjustments are made, improving the preparation quality.

[0042] Further, the present invention optimizes the ring rolling process by determining the ring rolling mode of the aluminum alloy ring rolling blank according to the size evaluation coefficient, thereby improving the preparation efficiency.

[0043] Further, the present invention can effectively monitor and control the ring rolling process in the asynchronous ring rolling mode by determining whether the ring rolling of the aluminum alloy ring rolling blank meets the preset standard according to the first ring rolling end face characteristic value, thereby ensuring the ring rolling quality of the aluminum alloy ring rolling blank.

[0044] Furthermore, the present invention is provided with several reduction methods for the reduction of the reduction amount per revolution of the next preset length segment, and each reduction method has a different reduction amplitude for the reduction amount per revolution of the next preset length segment, thereby realizing precise control of the reduction amount per revolution.

[0045] Furthermore, by secondarily determining whether the ring rolling of the aluminum alloy ring rolling blank meets the standard according to the crack characteristic value, the present invention can more precisely control the ring rolling quality of the aluminum alloy ring rolling blank, thereby improving the preparation quality.

[0046] Furthermore, by setting that the increasing amplitude of the ring rolling temperature is positively correlated with the crack difference value, the present invention effectively controls the crack formation of the aluminum alloy ring rolling blank, thereby improving the ring rolling quality.

[0047] Furthermore, by determining whether the preparation of the ring forging meets the preset standard according to the second ring rolling end face characteristic value, the present invention realizes real-time monitoring of the preparation process of the ring forging.

[0048] Furthermore, by setting the second ring rolling end face characteristic value, the present invention provides a quantitative evaluation index, performs real-time monitoring on the ring forging end face, and improves the quality detection level of the preparation of the ring forging. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a flowchart of a method for preparing an aluminum alloy precision ring forging according to an embodiment of the present invention;

[0050] Figure 2 is a schematic diagram of an asynchronous ring rolling method in a method for preparing an aluminum alloy precision ring forging according to an embodiment of the present invention;

[0051] Figure 3 is a schematic diagram of a synchronous ring rolling method in a method for preparing an aluminum alloy precision ring forging according to an embodiment of the present invention;

[0052] Figure 4 is a flowchart of determining whether the preparation of a ring forging meets a preset standard according to the second ring rolling end face characteristic value according to an embodiment of the present invention;

[0053] In the figure, 1, the first asynchronous ring rolling roll; 2, the second asynchronous ring rolling roll; 3, the aluminum alloy ring rolling blank; 4, the first synchronous ring rolling roll; 5, the second synchronous ring rolling roll. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0055] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and do not limit the protection scope of the present invention.

[0056] It should be noted that the data in this embodiment are obtained through comprehensive analysis and evaluation of the historical test data and corresponding historical test results of the present invention in the three months before this test. Those skilled in the art can understand that the method for determining a single above-mentioned parameter in the present invention can be to select the value with the highest proportion according to the data distribution as the preset standard parameter, use weighted summation to obtain the value as the preset standard parameter, substitute each historical data into a specific formula and use the value obtained by the formula as the preset standard parameter, or other selection methods, as long as it satisfies that the method of the present invention can clearly define different specific situations in the single-item determination process through the obtained value.

[0057] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 as shown, which are respectively the step diagram of the preparation method of the aluminum alloy precision ring forging in the embodiment of the present invention; the schematic diagram of the asynchronous ring rolling method in the preparation method of the aluminum alloy precision ring forging in the embodiment of the present invention; the schematic diagram of the synchronous ring rolling method in the preparation method of the aluminum alloy precision ring forging in the embodiment of the present invention; the flow chart for determining whether the preparation of the ring forging meets the preset standard according to the second ring rolling end face characteristic value in the embodiment of the present invention.

[0058] On the one hand, the present invention provides a preparation method of an aluminum alloy precision ring forging, including:

[0059] Cutting a blank from an aluminum alloy bar;

[0060] Successively heating, upsetting, and punching the blank to prepare an aluminum alloy ring rolling blank;

[0061] Obtaining the size information of the aluminum alloy ring rolling blank and the design size information of the alloy precision ring forging and calculating a size evaluation coefficient, wherein the size information of the aluminum alloy ring rolling blank includes the wall thickness and height of the aluminum alloy ring rolling blank, and the design size information of the alloy precision ring forging includes the designed wall thickness and designed height of the alloy precision ring forging;

[0062] Determining the ring rolling method of the aluminum alloy ring rolling blank according to the size evaluation coefficient, wherein the ring rolling method includes a synchronous ring rolling method and an asynchronous ring rolling method;

[0063] Completing the ring rolling of the first preset length section of 70 mm of the aluminum alloy ring rolling blank in the asynchronous ring rolling method, obtaining the deformation size of the ring rolling end face and then calculating the first ring rolling end face characteristic value;

[0064] When it is initially determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard according to the first ring rolling end face characteristic value, the ring rolling of the aluminum alloy ring rolling blank is re-determined according to the crack characteristic value, or the reduction amount per revolution in the next preset length section is reduced;

[0065] Under the synchronous ring rolling mode, the ring rolling of the first preset thickness section of 50 mm of the aluminum alloy ring rolling blank is completed to obtain a ring forging, and after obtaining the size information of the upper end face and the lower end face of the ring forging respectively, the second ring rolling end face characteristic value is obtained;

[0066] When it is determined that the preparation of the ring forging does not meet the preset standard according to the second ring rolling end face characteristic value, the ring rolling speed of the next preset thickness section is reduced;

[0067] Cool and package the aluminum alloy precision ring forgings that meet the preset standards.

[0068] The heating temperature is 460 °C, and the heat preservation time is 10 h. After the heat preservation is completed, the billet is taken out and upset on a press with an anvil temperature of 350 °C, and then moved to a punching machine for punching.

[0069] In this embodiment, the grade of the aluminum alloy is 5083 aluminum alloy.

[0070] Specifically, the ring rolling mode of the aluminum alloy ring rolling blank is determined according to the dimension evaluation coefficient, where,

[0071] If the dimension evaluation coefficient is less than the preset dimension threshold of 1.21, the synchronous ring rolling mode is adopted;

[0072] If the dimension evaluation coefficient is greater than or equal to the preset dimension threshold, the asynchronous ring rolling mode is adopted;

[0073] In this embodiment, the asynchronous ring rolling mode is as Figure 2 shown. In the figure, h1 represents the first preset length section, h2 represents the second preset length section. Under the asynchronous ring rolling mode, the aluminum alloy ring rolling blank is divided into several preset length sections, and the first asynchronous ring rolling roll and the second asynchronous ring rolling roll with chamfers are used to perform ring rolling in length sections, Figure 2 The first figure in Figure 2 represents the first pass of ring rolling in asynchronous ring rolling,

[0074] The synchronous ring rolling mode is as Figure 3 shown. The first synchronous ring rolling roll and the second synchronous ring rolling roll run simultaneously to perform ring rolling on the aluminum alloy ring rolling blank at one time without performing segmented ring rolling operations, Figure 3 The first figure in Figure 3The second figure in [the figure] shows the second ring rolling in synchronous ring rolling.

[0075] Specifically, the dimensional evaluation coefficient is calculated according to the following formula:

[0076]

[0077] In the formula, P represents the dimensional evaluation coefficient; d1 represents the wall thickness of the aluminum alloy ring rolling blank; d0 represents the designed wall thickness of the alloy precision ring forging; represents the wall thickness weight, ; L1 represents the height of the aluminum alloy ring rolling blank; L0 represents the designed height of the alloy precision ring forging; represents the height weight, .

[0078] Specifically, the process of determining that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard according to the first ring rolling end face characteristic value includes:

[0079] Compare the first ring rolling end face characteristic value with the first preset ring rolling threshold value of 4.67 mm and the second preset ring rolling threshold value of 8.72 mm respectively;

[0080] If the first ring rolling end face characteristic value is greater than or equal to the first preset ring rolling threshold value and less than the second preset ring rolling threshold value, it is determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard, and the aluminum alloy ring rolling blank with the ring rolling to the first preset length is continuously ring rolled to the second preset length section of 60 mm and the ring rolling of the aluminum alloy ring rolling blank is re-determined according to the crack characteristic value whether it meets the standard;

[0081] If the first ring rolling end face characteristic value is greater than or equal to the second preset ring rolling threshold value, it is determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard, and the per-revolution reduction amount of the next preset length section is reduced according to the difference between the first ring rolling end face characteristic value and the second preset ring rolling threshold value.

[0082] Specifically, the process of obtaining the first ring rolling end face characteristic value includes:

[0083] Under the condition that the aluminum alloy ring rolling blank is ring rolled to the first length section, use a profile measuring instrument to perform profile measurement on the end face of the aluminum alloy ring rolling blank to obtain the peak value of each waveform;

[0084] Calculate the average value of the obtained peak values, which is recorded as the first ring rolling end face characteristic value.

[0085] Specifically, there are several reduction methods for setting the per-revolution reduction amount of the next preset length section. Among them,

[0086] If the difference in the ring rolling end face is less than the first preset difference in the ring rolling end face of 0.21, the first adjustment coefficient of 0.97 is used to reduce the feed per revolution in the next preset length segment;

[0087] If the difference in the ring rolling end face is greater than or equal to the first preset difference in the ring rolling end face and less than the second preset difference in the ring rolling end face of 0.39, the second adjustment coefficient of 0.95 is used to reduce the feed per revolution in the next preset length segment;

[0088] If the difference in the ring rolling end face is greater than or equal to the second preset difference in the ring rolling end face, the third adjustment coefficient of 0.93 is used to reduce the feed per revolution in the next preset length segment;

[0089] The difference in the ring rolling end face is the difference between the first ring rolling end face characteristic value and the second preset ring rolling threshold.

[0090] Specifically, according to the crack characteristic value, it is determined secondarily whether the ring rolling of the aluminum alloy ring rolling blank meets the standard, where

[0091] If the crack characteristic value is less than the preset crack characteristic value of 0.75, it is determined that the ring rolling of the aluminum alloy ring rolling blank meets the standard;

[0092] If the crack characteristic value is greater than or equal to the preset crack characteristic value, it is determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the standard, and the ring rolling temperature during the ring rolling of the aluminum alloy ring rolling blank is reduced according to the difference between the crack characteristic value and the preset crack characteristic value;

[0093] The crack characteristic value is the ratio of the total crack length on the inner wall of the preset junction area between the first preset length segment and the second preset length segment to the preset crack length of 8 cm under the condition that the aluminum alloy ring rolling blank is ring rolled to the second preset length segment.

[0094] In this embodiment, the width of the preset junction area is 10 cm.

[0095] In this embodiment, the total crack length is obtained by ultrasonic testing.

[0096] In this embodiment, the preset crack characteristic value is selected within the range of (0.89, 1.34). Preferably, the preset crack characteristic value is selected as 1.05.

[0097] Specifically, the selection range of the preset crack length is [3 cm, 10 cm]. In this embodiment, the preset crack length is selected as 8 cm.

[0098] Specifically, the increase amplitude of the ring rolling temperature is positively correlated with the crack difference value, where the positive correlation is, for example, a linear positive correlation or a non-linear positive correlation. The linear slope of the linear positive correlation is not specifically limited. It can be understood that the larger the crack difference value, the greater the increase amplitude of the ring rolling temperature; the crack difference value is the difference between the crack characteristic value and the preset crack characteristic value.

[0099] It can be understood that by increasing the heating temperature of the aluminum alloy ring rolling blank, the thermal stress caused by uneven temperature can be reduced, thereby reducing the risk of crack generation.

[0100] Specifically, the process of determining that the preparation of the ring forging does not meet the preset standard according to the second ring rolling end face characteristic value includes:

[0101] Compare the second ring rolling end face characteristic value with the preset end face threshold value of 7.49 mm.

[0102] If the second ring rolling end face characteristic value is greater than or equal to the preset end face threshold value, it is determined that the preparation of the ring forging does not meet the preset standard and the ring rolling speed is reduced according to the difference between the second ring rolling end face characteristic value and the preset end face threshold value.

[0103] Specifically, the process of obtaining the second ring rolling end face characteristic value includes:

[0104] Perform ring rolling on the aluminum alloy ring rolling blank in the synchronous ring rolling mode to obtain a ring forging.

[0105] Use a profile measuring instrument to measure the peak values of each waveform of the wavy defects on the upper end face and the lower end face of the inner wall of the ring forging respectively.

[0106] Calculate the average value of the peak values, which is recorded as the second ring rolling end face characteristic value.

[0107] On the other hand, the present invention also provides an aluminum alloy precision ring forging, characterized in that the ratio of the length of the aluminum alloy precision ring forging to the outer diameter of the aluminum alloy precision ring forging is greater than 0.8.

[0108] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0109] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention; for those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for preparing an aluminum alloy precision ring forging, characterized in that: include: Cutting billets from aluminum alloy bars; The blank is heated, roughened and punched in sequence to prepare an aluminum alloy rolled ring blank; Obtaining the size information of the aluminum alloy rolled ring blank and the design size information of the alloy precision ring forging and obtaining the size evaluation coefficient, wherein the size information of the aluminum alloy rolled ring blank includes the wall thickness of the aluminum alloy rolled ring blank and the height of the aluminum alloy rolled ring blank, and the design size information of the alloy precision ring forging includes the design wall thickness of the alloy precision ring forging and the design height of the alloy precision ring forging; The ring rolling method of the aluminum alloy ring rolling blank is determined according to the size evaluation coefficient, wherein: If the size evaluation coefficient is less than the preset size threshold, the synchronous ring rolling method is adopted; If the size evaluation coefficient is greater than or equal to the preset size threshold, the asynchronous ring rolling method is adopted; The size evaluation coefficient is determined based on the wall thickness of the aluminum alloy rolled ring blank, the height of the aluminum alloy rolled ring blank, the designed wall thickness of the alloy precision ring forging, and the designed height of the alloy precision ring forging; In an asynchronous ring rolling mode, the aluminum alloy ring rolling blank is divided into a plurality of preset length segments, and the rings are rolled in the length segments using a first asynchronous ring rolling roller and a second asynchronous ring rolling roller with chamfers; In the synchronous ring rolling mode, the first synchronous ring rolling roller and the second synchronous ring rolling roller run simultaneously, and the aluminum alloy ring rolling blank is rolled at one time without performing segmented ring rolling operation; The aluminum alloy ring blank is rolled in a first preset length section in the asynchronous ring rolling mode, and a first ring rolling end face characteristic value is obtained after the deformation size of the ring rolling end face is obtained; When it is preliminarily determined according to the first ring end face characteristic value that the rolled ring of the aluminum alloy rolled ring blank does not meet the preset standard, it is secondarily determined according to the crack characteristic value whether the rolled ring of the aluminum alloy rolled ring blank meets the standard, or the reduction per revolution of the next preset length section is reduced; The first preset thickness section of the aluminum alloy ring blank is rolled in the synchronous ring rolling mode to obtain a ring forging and obtain the size information of the upper end face and the lower end face of the ring forging to obtain the second ring rolling end face characteristic value; When it is determined according to the second ring rolling end face characteristic value that the preparation of the ring forging does not meet the preset standard, reducing the ring rolling rate of the next preset thickness section; Cooling and packaging of aluminum alloy precision ring forgings that meet preset standards; The process of obtaining the first rolling ring end face feature value includes: Under the condition that the aluminum alloy rolled ring blank is rolled to a first length section, a profile measuring instrument is used to measure the profile of the end surface of the aluminum alloy rolled ring blank to obtain the peak value of each waveform; The average value of the peak value is recorded as the characteristic value of the end surface of the first rolling ring; The crack characteristic value is the ratio of the total length of cracks on the inner wall of the preset boundary area of ​​the first preset length section and the second preset length section to the preset crack length under the condition that the aluminum alloy ring blank is rolled to the second preset length section; The process of obtaining the second rolling ring end surface characteristic value includes: Rolling the aluminum alloy ring blank in the synchronous ring rolling mode to obtain a ring forging; Using a profilometer to measure the peak values ​​of each waveform of the wavy defects on the upper end surface and the lower end surface of the inner wall of the ring forging; Calculate the average value of the peak value and record it as the characteristic value of the end surface of the second rolling ring.

2. The method for preparing an aluminum alloy precision ring forging according to claim 1, characterized in that: The process of determining, according to the first rolled ring end face characteristic value, that the rolled ring of the aluminum alloy rolled ring blank does not meet the preset standard includes: Comparing the first ring rolling end surface characteristic value with the first preset ring rolling threshold and the second preset ring rolling threshold respectively; If the first ring rolling end face characteristic value is greater than or equal to the first preset ring rolling threshold value and less than the second preset ring rolling threshold value, it is determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard, and the aluminum alloy ring rolling blank rolled to the first preset length is further rolled to the second preset length section and a second determination is made based on the crack characteristic value whether the ring rolling of the aluminum alloy ring rolling blank meets the standard; If the first ring rolling end face characteristic value is greater than or equal to the second preset ring rolling threshold, it is determined that the ring rolling of the aluminum alloy ring rolling blank does not meet the preset standard, and the pressing amount per revolution of the next preset length segment is reduced according to the difference between the first ring rolling end face characteristic value and the second preset ring rolling threshold.

3. The method for preparing an aluminum alloy precision ring forging according to claim 2, characterized in that: There are several reduction methods for reducing the amount of pressure reduction per revolution of the next preset length segment, and each reduction method has a different reduction range for the amount of pressure reduction per revolution of the next preset length segment.

4. The method for preparing an aluminum alloy precision ring forging according to claim 3, characterized in that: According to the crack characteristic value, it is determined whether the rolled ring of the aluminum alloy rolled ring blank meets the standard. If the crack characteristic value is less than a preset crack characteristic value, it is determined that the ring rolling of the aluminum alloy ring rolling blank meets the standard; If the crack characteristic value is greater than or equal to the preset crack characteristic value, it is determined that the ring rolling of the aluminum alloy ring blank does not meet the standard, and the ring rolling temperature of the aluminum alloy ring blank during ring rolling is reduced according to the difference between the crack characteristic value and the preset crack characteristic value.

5. The method for preparing an aluminum alloy precision ring forging according to claim 4, characterized in that: The increase amplitude of the rolling ring temperature is positively correlated with the crack difference, wherein the crack difference is the difference between the crack characteristic value and the preset crack characteristic value.

6. The method for preparing an aluminum alloy precision ring forging according to claim 5, characterized in that: The process of determining, according to the second rolled ring end surface characteristic value, that the preparation of the ring forging does not meet the preset standard comprises: Compare the second rolling ring end face feature value with the preset end face threshold, If the second ring rolling end face characteristic value is greater than or equal to the preset end face threshold, it is determined that the preparation of the ring forging does not meet the preset standard and the ring rolling speed is reduced according to the difference between the second ring rolling end face characteristic value and the preset end face threshold.

7. An aluminum alloy precision ring forging prepared according to the method for preparing an aluminum alloy precision ring forging according to any one of claims 1 to 6, characterized in that: The ratio of the length of the aluminum alloy precision ring forging to the outer diameter of the aluminum alloy precision ring forging is greater than 0.8.

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