Aluminum alloy spinning cylinder roundness and straightness correction device and correction method

Abstract

The present invention discloses a device and method for calibrating the roundness and straightness of an aluminum alloy spun cylinder. The device comprises the following components: a first holding ring, a second holding ring, a base, and a pressure plate. The method includes the following steps: S1: Determine the position of the 0°-side busbar of the spun cylinder; S2: Measure the straightness and roundness of the spun cylinder; S3: Place the second holding ring on the base; S4: Place the spun cylinder into the second holding ring according to a specific position, and then place the first holding ring opposite each second holding ring position; S5: Correct the roundness of the spun cylinder using the bolts and aluminum foil pads placed on the inner walls of the first and second holding rings; S6: Correct the straightness of the spun cylinder using the pressure plate; S7: Place the spun cylinder into a furnace for heating and insulation, and then cool it with the furnace. The device can correct the roundness and straightness accuracy of the cylinder to within the required range.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment shape correction, in particular to a shape correction device for the roundness and straightness of an aluminum alloy spinning cylinder and a shape correction method thereof. Background Art

[0002] At present, during the spinning production of aluminum alloy cylinders, it is difficult to guarantee the accuracy indicators such as straightness and roundness for products with excessively large length and diameter.

[0003] Furthermore, because spinning involves intense plastic deformation, significant processing stress often remains within the product after deformation. Without adequate control measures, the product undergoes heat treatment, where internal stress is fully released, which can easily induce secondary deformation and further deteriorate dimensional accuracy.

[0004] Theoretical analysis and production practice have shown that the use of specialized tooling during heat treatment not only effectively controls and reduces deformation induced by stress release, but also, through coordination between tooling, can correct existing deformation to a certain extent. This combined heat treatment and shape correction process significantly improves product qualification rates while shortening production cycles and increasing efficiency, and is of great significance to engineering production. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the present invention provides a device and method for calibrating the roundness and straightness of aluminum alloy spun cylinders. By utilizing a calibrating tool during the heat treatment process, the roundness and straightness accuracy of the product are calibrated to within the required ranges simultaneously with the heat treatment. Without adding additional steps, this invention significantly improves product qualification rates.

[0006] To achieve the above-mentioned purpose, the present invention discloses an aluminum alloy spinning cylinder roundness and straightness correction device, comprising:

[0007] A first holding ring, the first holding ring is semicircular, and each end of the first holding ring is provided with a first protrusion, and the first protrusion is provided with a first through hole;

[0008] A second holding ring, the second holding ring being semicircular, with a second protrusion provided at each end of the second holding ring, and a second through hole provided on the second protrusion; a third protrusion provided in the middle of the second holding ring, and the third protrusion provided on the outside of the second holding ring; the first holding ring and the second holding ring are arranged relative to each other to form a closed loop, and the two first protrusions and the two second protrusions are provided correspondingly;

[0009] A base, wherein the second holding ring can be placed on the base through a third protrusion, and a screw is vertically passed through the base;

[0010] A pressing plate is arranged parallel to the base, and the screw rod is also vertically passed through the pressing plate, and the screw rod is used to fix the base and the pressing plate.

[0011] Preferably, when the first embracing ring and the second embracing ring are arranged opposite to each other, the two first protrusions and the two second protrusions are arranged opposite to each other, and the two first through holes and the two second through holes are arranged opposite to each other.

[0012] Preferably, the first holding ring and the second holding ring are fixed together by bolts passing through the first through hole and the second through hole.

[0013] Preferably, the aluminum alloy spinning cylinder roundness and straightness correction device also includes aluminum foil, and the aluminum foil can be set on the inner side of the first holding ring and the second holding ring.

[0014] The present application discloses a method for calibrating the roundness and straightness of an aluminum alloy spinning cylinder, comprising the following steps:

[0015] S1: Determine the position of the 0° side generatrix of the spinning cylinder, place the spinning cylinder on a horizontal platform, roll the spinning cylinder, and use a feeler gauge to find the maximum value Δmax of the gap between the outer surface of the middle area of ​​the spinning cylinder and the horizontal platform, and record the side generatrix where the spinning cylinder is close to the horizontal platform at this time as the 0° side generatrix;

[0016] S2: Measure the straightness and roundness of the spinning cylinder.

[0017] Preferably, the step S2 specifically includes measuring the straightness and roundness of the spinning cylinder, which specifically includes the following steps:

[0018] S201 Measurement of the straightness of the spun cylinder: The maximum value △max of the gap between the 0° side busbar and the platform in S1 is taken as the straightness of the spun cylinder.

[0019] S202 Measurement of the roundness of the spun cylinder: Based on the position of the 0° side busbar of the spun cylinder in S1, mark the 45°, 90°, and 135° side busbars in a counterclockwise direction (clockwise direction is also acceptable) at the end of the spun cylinder;

[0020] S203: along the axial direction of the spinning cylinder, a cross section is taken every 200 mm, and the outer diameter d corresponding to the 0°, 45°, 90°, and 135° directions of each cross section is measured in sequence using an outside micrometer;

[0021] S204: Take the maximum value dmax and the minimum value dmin of the four groups of measured outer diameter values ​​for each cross section, and divide the difference between the two by 2 to obtain the roundness D of the cross section.

[0022] S3: placing the second holding ring on the base.

[0023] S301: On the heat treatment furnace platform, first place a plurality of bases at both ends and the middle of the spinning cylinder according to the length of the spinning cylinder, and ensure that each base is as flush as possible and is fastened to the heat treatment furnace platform;

[0024] S302: Place the second holding ring on the base accordingly.

[0025] S4: placing the spinning cylinder into the second holding ring according to a certain position relationship, and then placing the first holding ring opposite to each position of the second holding ring.

[0026] Preferably, S401: adjust the 0° side busbar of the spinning cylinder downward, and place the cylinder on the second holding ring in S302;

[0027] S402: placing one second holding ring in the middle of the spinning cylinder, and distributing the remaining second holding rings on both sides of the middle second holding ring;

[0028] S403: placing the first holding ring on each of the second holding rings.

[0029] S5: Correcting the roundness of the spinning cylinder by using the bolts and placing aluminum foil on the inner walls of the first and second holding rings.

[0030] Preferably, S501: connect the first holding ring and the second holding ring through the bolt, and tighten the nut on the bolt.

[0031] S502: Based on the four groups of measured outer diameter values ​​for each cross section in S203, aluminum foil is placed on the outer surface of the spun cylinder with the maximum measured outer diameter dmax, and the bolts and nuts are tightened to generate a clamping force between the first and second holding rings, thereby reducing dmax and correspondingly increasing dmin.

[0032] S503: Using an outside micrometer, measure the outside diameters d of the first and second rings at a distance of 300-400 mm on both sides thereof at the directions of 0°, 45°, 90°, and 135° in the cross section, and calculate the roundness D.

[0033] If D is within the range of 0-0.4mm, the roundness correction is effective.

[0034] If D exceeds the range of 0-0.4 mm, step S502 is repeated to make D meet the requirement of 0-0.4 mm.

[0035] S504: Complete the roundness correction of the cylinder by all the rings according to step S503.

[0036] S6: Correcting the straightness of the spinning cylinder by the pressing plate;

[0037] S601: Using spacers to raise the two second holding rings at both ends of the spinning cylinder and the base to a height greater than 3×Δmax;

[0038] S602: placing the pressing plate on the first holding ring in the middle of the spinning cylinder, and connecting the pressing plate to the base via a screw;

[0039] S603: Adjust the degree of pressure of the pressure plate on the first holding ring by adjusting the screw, and determine that the downward pressure reaches (2-2.5)×Δmax by measuring the gap between the second holding ring and the base.

[0040] S7: Enter the furnace for heating and heat preservation and cool down with the furnace.

[0041] S701: The device and the spinning cylinder are placed into the heat treatment furnace through the platform, heated at a temperature of 260-320° C., kept warm for 4-6 hours, and cooled with the furnace.

[0042] S702: After sufficient cooling, unload the pressing plate, the first holding ring and the second holding ring, place the calibrated spinning cylinder on the horizontal platform to verify whether the roundness and straightness meet the design requirements. If not, repeat steps S1-S7.

[0043] The beneficial effects of the present invention are as follows:

[0044] 1. The present invention corrects the roundness of the aluminum alloy spinning cylinder by designing a simple shape correction device, and corrects the straightness of the aluminum alloy spinning cylinder by combining the pressure plate, the holding ring and the base. The shape correction device has a simple structure, but the shape correction effect is obvious and the quality is stable.

[0045] 2. The material of the ring tooling designed in the present invention is cast aluminum, which is inexpensive and easy to cast, and can meet the requirements of the shape correction process design, saving costs;

[0046] 3. Without adding any additional steps, the present invention only uses a simple shape-correcting tool during the heat treatment process to make the roundness and straightness accuracy indicators of the product meet the design requirements again, thereby significantly improving the product qualification rate.

[0047] In order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 2 is a schematic structural diagram of a device for correcting the roundness and straightness of an aluminum alloy spinning cylinder according to an embodiment of the present invention;

[0050] Figure 2 Schematic diagram of the position of the generatrix on the 0° side of the spinning cylinder in an embodiment of the present invention;

[0051] Figure 3 Schematic diagram of measuring the roundness of a spinning cylinder in an embodiment of the present invention.

[0052] Reference numerals in the above drawings:

[0053] 1. First holding ring; 11. First protrusion; 12. First through hole;

[0054] 2. Second holding ring; 21. Second protrusion; 23. Second through hole; 24. Third protrusion;

[0055] 3. Base; 31. Screw;

[0056] 4. Press plate;

[0057] 5. Horizontal platform;

[0058] 6. Spinning the cylinder. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0061] To achieve the above purpose, if Figure 1 As shown, the present invention provides a 6-degree roundness and straightness correction device for an aluminum alloy spinning cylinder, comprising:

[0062] A first holding ring 1, which is semicircular in shape, has a first protrusion 11 at each end thereof, and a first through hole 12 is provided on the first protrusion 11;

[0063] The second holding ring 2 is semicircular, with a second protrusion 21 provided at each end of the second holding ring 2, and a second through hole 23 provided on the second protrusion 21; a third protrusion 24 is provided in the middle of the second holding ring 2, and the third protrusion 24 is provided on the outside of the second holding ring 2; the first holding ring 1 and the second holding ring 2 are arranged relative to each other to form a closed loop, and the two first protrusions 11 and the two second protrusions 21 are respectively provided in correspondence;

[0064] A base 3, on which the second holding ring 2 can be placed via a third protrusion 24, and a screw 31 is vertically provided on the base 3;

[0065] The pressing plate 4 is arranged parallel to the base 3 , and the screw 31 is also vertically penetrated on the pressing plate 4 , and the screw 31 is used to fix the base 3 and the pressing plate 4 .

[0066] Furthermore, when the first embracing ring 1 and the second embracing ring 2 are arranged opposite to each other, the two first protrusions 11 and the two second protrusions 21 are arranged opposite to each other, and the two first through holes 12 and the two second through holes 23 are arranged opposite to each other.

[0067] Furthermore, the first holding ring 1 and the second holding ring 2 are fixed together by bolts passing through the first through hole 12 and the second through hole 23 .

[0068] Furthermore, the roundness and straightness correction device of the aluminum alloy spinning cylinder 6 also includes aluminum foil, which can be set on the inner side of the first holding ring 1 and the second holding ring 2.

[0069] The present invention provides a 6-degree roundness and straightness correction process for an aluminum alloy spinning cylinder, comprising the following steps:

[0070] S1: Determine the position of the 0° side busbar of the spun cylinder 6, place the spun cylinder 6 on the horizontal platform 5, roll the spun cylinder 6, and use a feeler gauge to find the maximum value △max of the gap between the outer surface of the middle area of ​​the spun cylinder 6 and the platform, and record the side busbar where the spun cylinder 6 is close to the horizontal platform 5 at this time as the 0° side busbar.

[0071] S2: Measure the straightness and roundness of the spinning cylinder 6.

[0072] S201: Measurement of the straightness of the spun cylinder 6: The maximum value △max of the gap between the 0° side busbar and the platform in S1 is taken as the straightness of the spun cylinder 6.

[0073] S202: Measurement of the roundness of the spun cylinder 6: Based on the position of the 0° side busbar of the spun cylinder 6 in S1, mark the 45°, 90°, and 135° side busbars in a counterclockwise or clockwise direction at the end of the spun cylinder 6.

[0074] S203: Take a cross section every 200 mm along the axial direction of the spinning cylinder 6, and use an outside micrometer to measure the outside diameter d of each cross section at 0°, 45°, 90°, and 135° directions in sequence.

[0075] S204: Take the maximum value dmax and the minimum value dmin of the four groups of measured outer diameter values ​​for each cross section, and divide the difference between the two by 2 to obtain the roundness D of the cross section.

[0076] S3: placing the second holding ring 2 on the base 3.

[0077] S301: On the heat treatment furnace platform, according to the length of the spinning cylinder 6, first place a number of the bases 3 at both ends and the middle position of the spinning cylinder 6 in sequence, and ensure that each of the bases 3 is as flush as possible and fastened to the heat treatment furnace platform.

[0078] S302: Place the second holding ring 2 on the base 3 accordingly.

[0079] S4: Place the spinning cylinder 6 into the second holding ring 2 according to a certain position relationship, and then place the first holding ring 1 opposite to the second holding ring 2 at each position.

[0080] S401: Adjust the 0° side busbar of the spinning cylinder 6 downward, and place the cylinder on the second holding ring 2 in S302.

[0081] S402: placing one second embrace ring 2 in the middle of the spinning cylinder 6, and the rest of the second embrace rings 2 are distributed on both sides of the middle second embrace ring 2.

[0082] S403: Place the first holding ring 1 on each of the second holding rings 2.

[0083] S5: Correcting the roundness of the spinning cylinder 6 by using the bolts and placing aluminum foil on the inner walls of the first holding ring 1 and the second holding ring 2 .

[0084] S501: Connect the first holding ring 1 and the second holding ring 2 via the bolts, and tighten the nuts on the bolts.

[0085] S502: Based on the four groups of measured outer diameter values ​​for each cross section in S203, aluminum foil is placed on the outer surface of the spun cylinder 6 with the maximum measured outer diameter dmax, and the bolts and nuts are tightened to generate a clamping force between the first holding ring 1 and the second holding ring 2, thereby reducing dmax and correspondingly increasing dmin.

[0086] S503: Using an outside micrometer, measure the outside diameters d of the first holding ring 1 and the second holding ring 2 at a distance of 300-400 mm on both sides thereof at 0°, 45°, 90°, and 135° in the cross section, and calculate the roundness D.

[0087] If D is within the range of 0-0.4 mm, the roundness correction is effective; if D exceeds the range of 0-0.4 mm, step S502 is repeated to make D meet the requirement of 0-0.4 mm.

[0088] S504: Complete the roundness correction of the cylinder by all the rings according to step S503.

[0089] S6: Correcting the straightness of the spinning cylinder 6 through the pressing plate 4.

[0090] S601: Use pads to raise the two second holding rings 2 at both ends of the spinning cylinder 6 and the base 3, with the raising height being greater than 3×Δmax.

[0091] S602: placing the pressing plate 4 on the first holding ring 1 in the middle of the spinning cylinder 6 , and connecting the pressing plate 4 to the base 3 via a screw 31 .

[0092] S603: Adjust the degree of pressure of the pressure plate 4 on the first holding ring 1 by adjusting the screw 31, and determine that the downward pressure reaches (2-2.5)×△max by measuring the gap between the second holding ring 2 and the base 3.

[0093] S7: Enter the furnace for heating and heat preservation and cool down with the furnace.

[0094] S701: The device and the spinning cylinder 6 are placed into the heat treatment furnace through the platform, heated at a temperature of 260-320° C., kept warm for 4-6 hours, and cooled with the furnace.

[0095] S702: After sufficient cooling, unload the pressing plate 4, the first holding ring 1 and the second holding ring 2, and place the calibrated spinning cylinder 6 on the horizontal platform 5 to verify whether the roundness and straightness meet the design requirements. If not, repeat steps S1-S7.

[0096] It can be understood that the present invention provides an aluminum alloy spun cylinder 6 roundness and straightness correction device that can correct the cylinder with a roundness tolerance within 4mm and a straightness within 8mm / full length.

[0097] Example 1: The spinning cylinder 6 calibrated in this experiment has a length of 5100 mm, an outer diameter of 534.4 mm, a wall thickness of 10 mm, a roundness of 2 mm before calibration, and a straightness of 4 mm / full length. It is made of aluminum alloy.

[0098] A feeler gauge is used to find the position of the largest gap on the horizontal platform 5;

[0099] An outside micrometer is used to measure the roundness of the spinning cylinder 6;

[0100] The measurement calibration method includes the following steps:

[0101] S1: Determine the position of the 0° side generatrix of the spinning cylinder 6:

[0102] S101: Please refer to Figure 2 , place the spinning cylinder 6 on the horizontal platform 5, roll the cylinder, and use the feeler gauge to find the maximum value of the gap between the outer surface of the middle area of ​​the cylinder and the platform △max = 4mm, and record the side busbar where the cylinder and the platform are close to each other as the 0° side busbar. Figure 1 shown.

[0103] S2: Measure the straightness and roundness of the spinning cylinder 6:

[0104] Measurement of the straightness of the spinning cylinder 6:

[0105] S201: If Figure 2 As shown, the maximum value of the gap between the 0° side busbar and the platform, △max=4mm, is taken as the straightness of the spinning cylinder 6.

[0106] Roundness measurement:

[0107] S202: If Figure 3 As shown, according to the position of the 0° side busbar of the spinning cylinder 6, at the cylinder port, the 45°, 90°, and 135° side busbars are marked in a counterclockwise direction (clockwise direction is also acceptable);

[0108] S203: Take a cross section every 200 mm along the axial direction of the spinning cylinder 6, and use an outside micrometer to measure the outside diameter d of each cross section at 0°, 45°, 90°, and 135° directions in sequence.

[0109] S204: Take the maximum value dmax and the minimum value dmin of the four groups of measured outer diameter values ​​for each cross section, and divide the difference between the two by 2 to obtain the roundness D of the cross section.

[0110] S3: Place the base 3 and the second holding ring 2.

[0111] S301: On the heat treatment furnace platform, since the spinning cylinder 6 is 5100 mm long, first, bases 3 are placed at both ends and in the middle of the spinning cylinder 6, ensuring that each base 3 is as flush as possible and fastened to the heat treatment furnace platform. Based on production experience, considering that the effective area of ​​each pair of holding rings is approximately 0.5 m, the spacing between adjacent bases 3 is set to 1 m. In this example, a total of five pairs of holding rings are used for calibration.

[0112] S302: Place the second holding ring 2 on the base 3.

[0113] S4: Place the spinning cylinder 6 into the second holding ring 2 according to a certain position relationship, and then place the first holding ring 1 opposite to each second holding ring 2 position:

[0114] S401: Adjust the 0° side generatrix of the spinning cylinder 6 downward, and place the spinning cylinder 6 on the second holding ring 2;

[0115] S402: Ensure that a second holding ring 2 is placed in the middle of the cylinder, and the remaining second holding rings 2 are distributed on both sides of the middle second holding ring 2, with emphasis on the position where the roundness D value is large;

[0116] S403: Place the first holding ring 1 on each second holding ring 2, and the shape adjustment device is as follows: Figure 1 shown.

[0117] S5: Aluminum foil is placed on the inner walls of the first holding ring 1 and the second holding ring 2, and then the first holding ring 1 and the second holding ring 2 are fixed together with bolts and nuts to correct the roundness of the spinning cylinder 6.

[0118] S501: Connect the first holding ring 1 and the second holding ring 2 with bolts and tighten the nuts.

[0119] S502: Taking the four sets of measured values ​​of 534.34mm, 534.7mm, 534.78mm, and 533.66mm of a cross section in this example as an example, the inner diameter of the holding ring is 540mm. Six sheets of aluminum foil (each sheet is 0.5mm thick) are placed on the outer surface of the cylinder with the maximum measured outer diameter dmax = 534.78mm. The bolts and nuts are tightened to generate a clamping force on the upper and lower holding rings, thereby reducing dmax. Correspondingly, dmin will increase.

[0120] S503: Use an outside micrometer to measure the outer diameters d at 0°, 45°, 90°, and 135° on each side of the rings at a distance of 300-400 mm from the rings, and calculate the roundness D. If D is within the range of 0-0.4 mm, the roundness correction is effective. If D is outside the range of 0-0.4 mm, repeat step 2 to bring D within the 0-0.4 mm requirement.

[0121] S504: Complete the roundness correction of the cylinder by all the rings according to the third step.

[0122] S6: Please refer to Figure 1 , the straightness of the spinning cylinder 6 is corrected by the pressing plate 4.

[0123] S601: Use spacers to raise the two outermost pairs of rings of the spinning cylinder 6 and the base 3 to a height greater than 12 mm.

[0124] S602: Place a pressing plate 4 on the first holding ring 1 in the middle of the spinning cylinder 6. The pressing plate 4 is connected to the base 3 via a screw 31.

[0125] S603: Adjust the degree of pressure of the pressure plate 4 on the holding ring by adjusting the screw 31. The pressure is determined to be 10 mm by measuring the gap between the second holding ring 2 and the base 3. The holding ring and the pressure plate 4 are matched as follows: Figure 1 shown.

[0126] S7: Enter the furnace for heating and heat preservation and cool down with the furnace:

[0127] S701: The shape correction device and the spinning cylinder 6 are put into the heat treatment furnace through the platform and heated at a temperature of 280°C. The temperature is kept for 4 hours and cooled with the furnace.

[0128] S702: After sufficient cooling, unload the pressing plate 4, the holding ring and other tooling, and place the calibrated cylinder on the horizontal platform 5 to verify whether the roundness and straightness meet the design requirements. If not, repeat steps 1-7.

[0129] It can be understood that the present invention corrects the roundness of the aluminum alloy spun cylinder 6 by designing a simple correction device, and corrects the straightness of the aluminum alloy spun cylinder 6 by combining the pressure plate 44, the first holding ring 11, the second holding ring 22, and the base 33. The correction device has a simple structure, but the correction effect is obvious and the quality is stable.

[0130] The present invention can make the roundness and straightness accuracy indicators of the product meet the design requirements again without adding any additional working steps, and significantly improve the product qualification rate by only using a simple shaping tool during the heat treatment process.

[0131] Example 2: The spinning cylinder 6 calibrated in this process has a length of 5100 mm, an outer diameter of 534.4 mm, a wall thickness of 10 mm, a roundness of 4 mm before calibration, and a straightness of 8 mm / full length. It is made of aluminum alloy.

[0132] A feeler gauge is used to find the position of the largest gap on the horizontal platform 5;

[0133] An outside micrometer is used to measure the roundness of the spinning cylinder 6;

[0134] The measurement calibration method includes the following steps:

[0135] S1: Determine the position of the 0° side generatrix of the spinning cylinder 6:

[0136] S101: Please refer to Figure 2 , place the spinning cylinder 6 on the horizontal platform 5, roll the cylinder, and use the feeler gauge to find the maximum value of the gap between the outer surface of the middle area of ​​the cylinder and the platform △max=8mm, and record the side busbar where the cylinder and the platform are close to each other as the 0° side busbar. Figure 1 shown.

[0137] S2: Measure the straightness and roundness of the spinning cylinder 6:

[0138] Measurement of the straightness of the spinning cylinder 6:

[0139] S201: If Figure 2 As shown, the maximum value of the gap between the 0° side busbar and the platform, △max=8mm, is taken as the straightness of the spinning cylinder 6.

[0140] Roundness measurement:

[0141] S202: If Figure 3 As shown, according to the position of the 0° side busbar in the spinning cylinder 6, at the cylinder port, the 45°, 90°, and 135° side busbars are marked in the counterclockwise direction (clockwise direction is also acceptable);

[0142] S203: Take a cross section every 200 mm along the axial direction of the spinning cylinder 6, and use an outside micrometer to measure the outside diameter d of each cross section at 0°, 45°, 90°, and 135° directions in sequence.

[0143] S204: Take the maximum value dmax and the minimum value dmin of the four groups of measured outer diameter values ​​for each cross section, and divide the difference between the two by 2 to obtain the roundness D of the cross section.

[0144] S3: Place the base 3 and the second holding ring 2.

[0145] S301: On the heat treatment furnace platform, since the spinning cylinder 6 is 5100 mm long, first, bases 3 are placed at both ends and in the middle of the spinning cylinder 6, ensuring that each base 3 is as flush as possible and fastened to the heat treatment furnace platform. Based on production experience, considering that the effective area of ​​each pair of holding rings is approximately 0.5 m, the spacing between adjacent bases 3 is set to 1 m. In this example, a total of five pairs of holding rings are used for calibration.

[0146] S302: Place the second holding ring 2 on the base 3.

[0147] S4: Place the spinning cylinder 6 into the second holding ring 2 according to a certain position relationship, and then place the first holding ring 1 opposite to each second holding ring 2 position:

[0148] S401: Adjust the 0° side generatrix of the spinning cylinder 6 downward, and place the spinning cylinder 6 on the second holding ring 2;

[0149] S402: Ensure that a second holding ring 2 is placed in the middle of the cylinder, and the remaining second holding rings 2 are distributed on both sides of the middle second holding ring 2, with emphasis on the position where the roundness D value is large;

[0150] S403: Place the first holding ring 1 on each second holding ring 2, and the shape adjustment device is as follows: Figure 1 shown.

[0151] S5: Aluminum foil is placed on the inner walls of the first holding ring 1 and the second holding ring 2, and then the first holding ring 1 and the second holding ring 2 are fixed together with bolts and nuts to correct the roundness of the spinning cylinder 6.

[0152] S501: Connect the first holding ring 1 and the second holding ring 2 with bolts and tighten the nuts.

[0153] S502: Take the four sets of measured values ​​of 537.34 mm, 534.7 mm, 529.34 mm, and 533.66 mm for a cross section in this example as an example. The inner diameter of the holding ring is 540 mm. Six sheets of aluminum foil (each sheet is 0.5 mm thick) are placed on the outer surface of the cylinder with the maximum measured outer diameter dmax = 537.34 mm. Tighten the bolts and nuts to generate a clamping force on the upper and lower holding rings, thereby reducing dmax. Correspondingly, dmin will increase.

[0154] S503: Use an outside micrometer to measure the outer diameters d at 0°, 45°, 90°, and 135° on each side of the rings at a distance of 300-400 mm from the rings, and calculate the roundness D. If D is within the range of 0-0.4 mm, the roundness correction is effective. If D is outside the range of 0-0.4 mm, repeat step 2 to bring D within the 0-0.4 mm requirement.

[0155] S504: Complete the roundness correction of the cylinder by all the rings according to the third step.

[0156] S6: Please refer to Figure 1 , the straightness of the spinning cylinder 6 is corrected by the pressing plate 4.

[0157] S601: Use spacers to raise the two outermost pairs of rings of the spinning cylinder 6 and the base 3 to a height greater than 24 mm.

[0158] S602: Place a pressing plate 4 on the first holding ring 1 in the middle of the spinning cylinder 6. The pressing plate 4 is connected to the base 3 via a screw 31.

[0159] S603: Adjust the degree of pressure of the pressure plate 4 on the holding ring by adjusting the screw 31. By measuring the gap between the second holding ring 2 and the base 3, it is determined that the downward pressure reaches 20mm. The holding ring and the pressure plate 4 are matched as follows: Figure 1 shown.

[0160] S7: Enter the furnace for heating and heat preservation and cool down with the furnace:

[0161] S701: The shape correction device and the spinning cylinder 6 are put into the heat treatment furnace through the platform and heated at a temperature of 280°C. The temperature is kept for 4 hours and cooled with the furnace.

[0162] S702: After sufficient cooling, unload the pressing plate 4, the holding ring and other tooling, and place the calibrated cylinder on the horizontal platform 5 to verify whether the roundness and straightness meet the design requirements. If not, repeat steps 1-7.

[0163] It can be understood that the present invention corrects the roundness of the aluminum alloy spinning cylinder by designing a simple shape correction device, and corrects the straightness of the aluminum alloy spinning cylinder by combining the pressure plate 4, the first holding ring 1, the second holding ring 2, and the base 3. The shape correction device has a simple structure, but the shape correction effect is obvious and the quality is stable.

[0164] The present invention can make the roundness and straightness accuracy indicators of the product meet the design requirements again without adding any additional working steps, and significantly improve the product qualification rate by only using a simple shaping tool during the heat treatment process.

[0165] Specific embodiments are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

[0166] The above 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 contents of the present invention description and drawings, 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 method for correcting the roundness and straightness of an aluminum alloy spinning cylinder, characterized in that: A shape correction device is used, which includes: a first embracing ring, the first embracing ring is semicircular, and a first protrusion is provided at each end of the first embracing ring, and a first through hole is provided on the first protrusion; a second embracing ring is semicircular, and a second protrusion is provided at each end of the second embracing ring, and a second through hole is provided on the second protrusion; a third protrusion is provided in the middle of the second embracing ring, and the third protrusion is provided on the outside of the second embracing ring; the first embracing ring and the second embracing ring are arranged opposite to each other to form a closed loop, and the two first protrusions and the two second protrusions are respectively arranged correspondingly; a base, the second embracing ring can be placed on the base through the third protrusion, and a screw is vertically penetrated on the base; a pressing plate, the pressing plate is arranged parallel to the base, and the screw is also vertically penetrated on the pressing plate, and the screw is used to fix the base and the pressing plate; the first embracing ring and the second embracing ring are fixed together by bolts passing through the first through hole and the second through hole; The shape correction method includes the following steps: S1: determine the position of the 0° side busbar of the spinning cylinder, place the spinning cylinder on a horizontal platform, roll the spinning cylinder, find the maximum value △max of the gap between the outer surface of the middle area of ​​the spinning cylinder and the horizontal platform by a feeler gauge, and record the side busbar of the spinning cylinder close to the horizontal platform at this time as the 0° side busbar; S2: measure the straightness and roundness of the spinning cylinder; S3: place the second holding ring on the base; S4: place the spinning cylinder into the second holding ring according to a certain position relationship, and then place the first holding ring opposite to each second holding ring position; S5: correct the roundness of the spinning cylinder by the bolt and by placing aluminum foil on the inner walls of the first holding ring and the second holding ring; S6: correct the straightness of the spinning cylinder by the pressure plate; the step S6 specifically includes the following steps: S601: the two ends of the spinning cylinder are The second holding ring and the base are raised with a pad, and the raising height is greater than 3×△max; S602: The pressure plate is placed on the first holding ring in the middle of the spinning cylinder, and the pressure plate is connected to the base through a screw; S603: The degree of pressure of the pressure plate on the first holding ring is adjusted by adjusting the screw, and the downward pressure is determined to reach (2-2.5)×△max by measuring the gap between the second holding ring and the base; S7: Enter the furnace for heating and insulation and cool with the furnace; S701: The device and the spinning cylinder are entered into the furnace for heating through the heat treatment furnace platform, the heating temperature is 260-320℃, insulation is 4-6h and cooling with the furnace; S702: After sufficient cooling, the pressure plate, the first holding ring and the second holding ring are unloaded, and the corrected spinning cylinder is placed on the horizontal platform to verify whether the roundness and straightness meet the design requirements. If not, repeat the steps S1-S7.

2. The shape correction method according to claim 1, wherein: The step S2 specifically includes the measurement of the straightness and roundness of the spun cylinder, and specifically includes the following steps: S201 measurement of the straightness of the spun cylinder: the maximum value △max of the gap between the 0° side busbar and the platform in S1 is used as the straightness of the spun cylinder; S202 measurement of the roundness of the spun cylinder: according to the position of the 0° side busbar of the spun cylinder in S1, the 45°, 90°, and 135° side busbars are marked in turn in a counterclockwise or clockwise direction at the port of the spun cylinder; S203: along the axial direction of the spun cylinder, a section is taken every 200 mm, and the outer diameter d corresponding to the 0°, 45°, 90°, and 135° directions of each section is measured in turn using an outside micrometer; S204: the maximum value dmax and the minimum value dmin of the four groups of measured outer diameter values ​​of each section are taken, and the difference between the two is divided by 2 to obtain the roundness D of the section.

3. The shape correction method according to claim 1, wherein: The specific steps of step S3 are as follows: S301: on the heat treatment furnace platform, according to the length of the spinning cylinder, first place several bases in sequence at both ends and in the middle of the spinning cylinder, and ensure that each base is as flush as possible and fastened to the heat treatment furnace platform; S302: place the second holding ring on the base accordingly.

4. The shape correction method according to claim 3, wherein: The step S4 specifically includes the following steps: S401: adjusting the 0° side busbar in the spun cylinder downward, and placing the cylinder on the second holding ring in S302; S402: placing one second holding ring in the middle of the spun cylinder, and the remaining second holding rings are distributed on both sides of the middle second holding ring; S403: placing the first holding ring correspondingly on each second holding ring.

5. The shape correction method according to claim 2, wherein: The step S5 specifically The method comprises the following steps: S501: connecting the first holding ring and the second holding ring by the bolt, and tightening the nut on the bolt; S502: placing aluminum foil on the outer surface of the spun cylinder with the maximum measured outer diameter dmax according to the four groups of measured outer diameter values ​​of each section in S203, tightening the bolt and the nut, so that the first holding ring and the second holding ring generate a clamping force, thereby reducing dmax, and correspondingly increasing dmin; S503: using an outside diameter micrometer to measure the outer diameters d corresponding to the 0°, 45°, 90°, and 135° directions in the cross section at positions 300-400mm apart on both sides of a first holding ring and a second holding ring respectively, and calculating the roundness D; if D is within the range of 0-0.4mm, the roundness correction is valid; if D exceeds the range of 0-0.4mm, repeating step S502 to make D meet the requirement of 0-0.4mm; S504: completing the correction of the cylinder roundness by all holding rings according to step S503.

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