Turning wall thickness difference control method for thin-wall tubular shaft part

Abstract

The invention discloses a thin-wall tubular shaft part turning wall thickness difference control method. When a thin-wall tubular shaft part is machined, the thin-wall tubular shaft part is machined according to the following steps that S1, rough machining is conducted on a blank; s2, solid solution aging; s3, rough machining of an inner hole; s4, stabilizing treatment; s5, finish machining of the inner hole; s6, outer circle rough machining; s7, finish machining of the outer circle; s8, milling a key groove; s9, deburring is conducted; s10, inspection is carried out; in the step S5 and the step S7, a plurality of positioning points are arranged on the surface of the part through a differential method and a segmented programming method, a whole cylindrical surface is averagely divided into a plurality of smaller cylindrical surfaces through the positioning points, and wall thickness measurement is carried out every time a section of cylindrical surface is machined. And the feed amount of the next section is adjusted according to the measurement result to ensure that the wall thickness difference is within a reasonable tolerance range. According to the novel wall thickness difference turning control method, adjustment can be conducted in the machining process to ensure that the size is qualified, follow-up local finishing is not needed any more, and the machining precision is better guaranteed.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing, and in particular to a method for controlling the wall thickness difference during turning of thin-walled tubular shaft parts. Background Art

[0002] High-precision thin-walled shafts play a role in the transmission of core mechanisms in some equipment. Therefore, the accuracy of the outer circle and inner hole of the parts will directly affect the final use accuracy and functional effect of the equipment. For thin-walled shaft parts with large size, thin wall thickness and high precision requirements, the parts themselves are very easy to deform. In actual processing, they will be affected by cutting force, cutting heat, clamping force, stress deformation and tool wear, etc., making it difficult to control the accuracy of the parts.

[0003] When processing thin-walled long tube parts with a wall thickness of 1.8mm and a wall thickness difference of less than 0.05mm and a length greater than 800mm using conventional machining methods, the wall thickness and wall thickness difference of the parts are mainly guaranteed by controlling the size of the inner hole and outer circle diameter. Among them, the inner hole of the shaft parts is processed first and then the outer circle. The size will change unevenly when processing the inner hole and the outer circle, resulting in the local diameter size being too large or too small, especially when using a damping tool bar to process the inner hole. At present, when programming the same diameter for turning parts, only two points, the starting point and the end point, will be generated. The size can only be adjusted by tilting the straight line formed by these two points upward or downward. It is impossible to adjust the local larger or smaller diameter by only generating two points. Therefore, it is difficult to guarantee the wall thickness and wall thickness difference size. It can only be done by local polishing and grinding after the processing is completed to ensure the wall thickness size after the processing is completed.

[0004] The invention application with publication number CN112518245B discloses a machining process for reducing the wall thickness difference of ultra-slender hollow shaft parts, which uses a specially designed positioning sleeve to clamp the workpiece and adjusts the positioning sleeve to control the wall thickness difference of hollow shaft parts. Although this solution can effectively reduce the wall thickness difference of hollow shaft parts, the installation of the positioning sleeve is complicated, and the adjustment principle of the installation of the positioning sleeve needs to rely on the experience of the installer to judge. In general, the entire processing method is still relatively complicated. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a method for controlling the wall thickness difference of thin-walled tubular shaft parts during turning, which can effectively control the wall thickness difference of thin-walled tubular shaft parts by performing segmented finishing on the workpiece through differential method and segmented programming method without local polishing after processing.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A method for controlling the wall thickness difference of thin-walled tubular shaft parts during turning, comprising the following steps:

[0008] S1. Rough machining of blank: machining the end face and outer circle of the part respectively;

[0009] S2. Solution aging: firstly treat the parts with solution, then treat the parts with aging;

[0010] S3. Inner hole rough processing: Use deep hole drilling machine to drill the bottom hole;

[0011] S4. Stabilization treatment: hang the parts in a heating furnace, heat to 540℃-560℃, keep warm for 3 hours and 30 minutes to 4 hours, and then place them in natural air for cooling;

[0012] S5 inner hole finishing: using CNC lathe, through differential method and segmented programming method, set several positioning points on the surface of the part, divide the whole cylindrical surface into multiple cylindrical surfaces of a certain length through the positioning points, measure the inner hole diameter of each cylindrical surface of a certain length, adjust the feed amount of the inner hole finishing of the next section according to the measurement result to ensure that the wall thickness difference is within a reasonable tolerance range, and turn the processing in two sections;

[0013] The differential method is to use the concept of differentials in mathematics to guide processing, and segmented programming is a method of programming by dividing a starting and ending point into multiple starting and ending points. In the field of mathematics, from the perspective of differentials, the processing axis can be regarded as a line segment composed of infinite points. If the thickness of these infinite points can be guaranteed to be the same, then there will be no wall thickness difference in this axis. However, it is not possible to divide infinitely during processing, so several positioning points are set on the surface of the part, and the entire cylindrical surface is evenly divided into multiple cylindrical surfaces of a certain length through the positioning points. The wall thickness of each cylindrical surface of a certain length is measured, and the program of the next section of the CNC lathe is programmed according to the measurement results, so as to adjust the feed amount of the next section to ensure that the wall thickness difference of the next section of the part is within a reasonable tolerance range. In this way, the inner hole can be fine-machined to within the tolerance range, which can effectively control the wall thickness difference of the part;

[0014] S6. External rough machining: Use CNC horizontal lathe to remove external circle allowance and leave finishing allowance on one side;

[0015] S7. External cylindrical finishing: using a CNC horizontal lathe, using a CNC lathe, through the same differential method and segmented programming method as step S5, several positioning points are set on the surface of the part, the entire cylindrical surface is evenly divided into multiple cylindrical surfaces of a certain length through the positioning points, and the external diameter of each cylindrical surface of a certain length is measured, and the feed amount of the next section of external cylindrical finishing is adjusted according to the measurement result to ensure that the wall thickness difference is within a reasonable tolerance range. In this way, the external cylindrical finishing is completed within the tolerance range, which can effectively control the wall thickness difference of the part;

[0016] S8. Milling keyway: Milling the outer circle and end face keyway on the CNC five-axis machining center;

[0017] S9. Deburring: Bench workers use grinding milling cutters, sandpaper, and flap wheels to remove all burrs after processing;

[0018] S10. Inspection: Check whether the parts meet the standards;

[0019] Furthermore, in step S1, the part is first clamped with hard jaws, the part is supported by a center stand, the end face of the part is turned and a center hole is drilled; the part is then clamped with hard jaws, supported by a center, and the outer circle of the part is turned to a length of 700 mm; the part is turned around, the outer circle of the part is clamped with hard jaws, the part is supported by a center stand, the other end face of the part is turned and a center hole is drilled; the part is then clamped with hard jaws, the center is supported to support the unprocessed outer circle of the turned part.

[0020] Furthermore, in step S2, when the solution treatment is carried out, the parts are hung vertically, kept at 770°C-790°C for 2 hours and 30 minutes to 3 hours, then heated to 965°C-985°C, kept at this temperature for 3 hours and 10 minutes to 3 hours and 40 minutes, and then oil-cooled; during the aging treatment, the parts are hung vertically, heated to 715°C-725°C, kept at this temperature for 8 hours to 8.5 hours, cooled to 615°C-625°C, kept at this temperature for 8 hours to 8.5 hours, and cooled to below 100°C with argon gas, which can effectively eliminate stress, improve material properties, and increase material strength.

[0021] Furthermore, in the steps S3 and S6, in order to reduce the cutting stress during machining, a blade with a small tip arc of 35° and a radius of 0.8 mm is used for machining, the feed rate is 0.1 mm / r, and the cutting depth is 0.7 mm.

[0022] Furthermore, in the steps S5 and S7, in order to reduce the cutting stress during machining, a blade with a small tool tip arc of 35° and a radius of 0.4 mm is used for machining, 0.05 mm / r, and a cutting depth of 0.2 mm.

[0023] Furthermore, in step S5, since the part is too long, the tool is connected in the middle of half of the inner hole, and the tool is connected in advance and obliquely when processing the other half of the inner hole, so as to avoid the phenomenon of digging by the damping tool rod when the part margin changes suddenly.

[0024] Furthermore, in the steps S3 and S6, the rough machining of the outer circle and the inner hole both reserve a machining allowance of 0.2 mm for subsequent fine machining.

[0025] Furthermore, in the steps S3 and S5, if the inner hole cutting linear speed is too fast, the tool chattering phenomenon is likely to occur. Through workshop experiments, it was found that the tool chattering phenomenon would be significantly reduced only when the inner hole cutting linear speed is reduced from 60m / min to 28.65m / min, so the inner hole cutting linear speed is set to 28.65m / min.

[0026] Furthermore, in the steps S6 and S7, the outer circle cutting linear speed is 50 m / min.

[0027] Furthermore, the step S10 includes using fluorescence detection to check whether there are defects on the surface of the part and size detection to check whether the size data of the part is within the tolerance range.

[0028] The present invention has the following beneficial effects:

[0029] 1. The differential method and segmented programming method are used to set multiple positioning points to solve the problem of wall thickness difference caused by irregular changes in the actual size of parts during the processing, and a new wall thickness difference turning control method is provided. The wall thickness difference of thin-walled tubular shaft parts can be effectively controlled during turning to ensure a more uniform size, reduce the subsequent repair work caused by uneven diameter changes, and greatly reduce the processing time of thin-walled tubular shaft parts.

[0030] 2. By adjusting the programming of the CNC machine tool, parts of different diameters and lengths can also use this subdivision method to adjust the inner hole and outer diameter to ensure that the final wall thickness difference is qualified. If the subdivision or adjustment is performed within a shorter range, the change in the inner hole and outer diameter of the part can be guaranteed to be no more than 0.01mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of a method for controlling the wall thickness difference during turning of thin-walled tubular shaft parts;

[0032] Figure 2 This is a schematic diagram of normal turning;

[0033] Figure 3 This is a schematic diagram of turning after improvement using the solution of the present invention;

[0034] Figure 4 This is a schematic diagram of the method for adjusting the inner hole and outer circle diameter before improvement;

[0035] Figure 5 Schematic diagram of the improved method for adjusting the inner hole and outer circle

[0036] In the figure: 1 is the positioning point. DETAILED DESCRIPTION

[0037] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0039] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the inventive content of the present application more thorough and comprehensive.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification are only for describing specific embodiments and are not intended to limit the present application.

[0041] Example 1

[0042] A method for controlling the wall thickness difference of thin-walled tubular shaft parts during turning, comprising the following steps:

[0043] S1. Rough machining of blank: machine the end face and outer circle of the part separately.

[0044] S2. Solution aging: first perform solution treatment on the parts, and then perform aging treatment on the parts. Furthermore, during the solution treatment, the parts are hung vertically, heated to 965°C after being kept at 770°C for 2 hours and 30 minutes, and then kept warm for 3 hours and 10 minutes, and then oil-cooled; during the aging treatment, the parts are hung vertically, heated to 715°C, kept warm for 8 hours, cooled to 620°C, and then kept warm for 8 hours, and cooled to room temperature with argon gas, which can effectively eliminate stress, improve material properties, and increase material strength. Furthermore, in the steps S3 and S6, in order to reduce the cutting stress during processing, a blade with a small tip arc of 35° and a radius of 0.8mm is used for processing, and the feed amount is 0.01mm.

[0045] S3. Inner hole rough machining: Use a deep hole drilling machine to drill the bottom hole to a diameter of 50mm with a tolerance range of +0.1 to 0.

[0046] S4. Stabilization treatment: Hang the parts in a heating furnace; heat to 540℃ and keep warm for 3.5 hours; then leave them to cool naturally in air.

[0047] S5. Inner hole finishing: Use CNC lathe, through differential method and segmented programming method, set several positioning points on the surface of the part, divide the whole cylindrical surface into 4 cylindrical surfaces with a length of 100mm through the positioning points, measure the wall thickness of each cylindrical surface, adjust the feed amount of the next section according to the measurement result, and turn around and process the inner hole to a diameter of 56.95mm in two sections, with a tolerance range of +0.05 to 0, and turn around and process in two sections;

[0048] like Figure 3 , the processing part is 800mm in length, and 4 positioning points are set for 400mm U-turn processing. The inner hole diameter is 53.3mm, the tolerance range is +0.15~0, the outer diameter is 57mm, the tolerance range is 0 to -0.05, and after each 100mm segment, the theoretical points obtained during programming are: starting position (X53.375, Z0.); 100mm from the exit is (X53.375, Z-100.); 200mm from the exit is (X53.375, Z-200.); 300mm from the exit is (X53.375, Z-300.); 400mm from the exit is (X53.375, Z-400.).

[0049] During the processing, the actual diameter of the part is measured every 100 mm and is as follows:

[0050] At the starting position, the inner hole diameter is 53.375mm; at 100mm from the part exit position, the inner hole diameter is 53.4mm; at 200mm from the part exit position, the inner hole diameter is 53.2mm; at 300mm from the part exit position, the inner hole diameter is 53.4mm; and at 400mm from the part exit position, the inner hole diameter is 53.25mm.

[0051] The diameter size is adjusted based on the measured diameter change.

[0052] Inner hole adjustment: The initial processing point is (X53.375, Z0). Because this point is a medium difference, no adjustment is required. The processing point at 100mm from the outlet is (X53.35, Z-100.), that is, if the measured value is 0.025 larger, the x value of this point is adjusted down by 0.025. The point at 200mm from the outlet is (X53.55, Z-200.), that is, If the measured value here is 0.175 smaller, then increase the x value here by 0.175; at 300mm away from the exit (X53.35, Z-300.), that is, the measured value is 0.025 larger, then decrease the x value here by 0.025; at 400mm away from the exit (X53.5, Z-400.), that is, the measured value is 0.125 smaller, then increase the x value by 0.125.

[0053] S6. External rough machining: Use CNC horizontal lathe to remove external circle allowance and leave finishing allowance on one side;

[0054] S7. External cylindrical finishing: Using a CNC lathe, through the differential method and segmented programming method, several positioning points are set on the surface of the part, and the entire cylindrical surface is evenly divided into 4 cylindrical surfaces with a length of 100 mm through the positioning points. The wall thickness is measured after each section of the cylindrical surface is processed, and the feed amount of the next section is adjusted according to the measurement results. The external cylindrical surface is finished and finished to a diameter of 60.7 mm with a tolerance range of 0 to -0.05;

[0055] like Figure 3 The outer diameter points are: at the starting position (X56.975, Z0.); 100mm from the exit is (X56.975, Z-100.); 200mm from the exit is (X56.975, Z-200.); 300mm from the exit is (X56.975, Z-300.); 400mm from the exit is (X56.975, Z-400.).

[0056] During the processing, the actual diameter of the part is measured every 100 mm and is as follows:

[0057] The outer diameter at the starting position is 57.08mm; the outer diameter at 100mm from the part exit position is 57.05mm; the outer diameter at 200mm from the part exit position is 57.00mm; the outer diameter at 300mm from the part exit position is 56.99mm; and the outer diameter at 400mm from the part exit position is 56.96mm.

[0058] The diameter size is adjusted based on the measured diameter change.

[0059] External circle adjustment: at the starting position (X56.87, Z0.), the actual size in the x direction is 0.105 larger, so adjust it to be 0.105 smaller; 100mm away from the exit is (X56.9, Z-100.), the actual size in the x direction is 0.075 larger, so adjust the x value of this point to be 0.075 smaller; 200mm away from the exit is (X56.95, Z-200.), the actual size in the x direction is 0.025 larger, so adjust the x value of this point to be 0.025 smaller; 300mm away from the exit is (X56.96, Z-300.), the actual size in the x direction is 0.015 larger, so adjust the x value of this point to be 0.015 smaller; 400mm away from the exit is (X56.99, Z-400.), the actual size in the x direction is 0.015 smaller, so adjust the x value of this point to be 0.015 larger.

[0060] S8. Milling keyway: Milling the outer circle and end face keyway on the CNC five-axis machining center;

[0061] S9. Deburring: Bench workers use grinding milling cutters, sandpaper, and flap wheels to remove all burrs after processing;

[0062] S10. Inspection: Check whether the parts meet the standards;

[0063] Furthermore, in step S1, the part is first clamped with hard jaws, the part is supported by a center stand, the end face of the part is turned and a center hole is drilled; the part is then clamped with hard jaws, supported by a center, and the outer circle of the part is turned to a length of 700 mm; the part is turned around, the outer circle of the part is clamped with hard jaws, the part is supported by a center stand, the other end face of the part is turned and a center hole is drilled; the part is then clamped with hard jaws, the center is supported to support the unprocessed outer circle of the turned part.

[0064] Furthermore, in the steps S3 and S6, in order to reduce the cutting stress during machining, a blade with a small tip arc of 35° and a radius of 0.8 mm is used for machining, the feed rate is 0.1 mm / r, and the cutting depth is 0.7 mm.

[0065] Furthermore, in the steps S5 and S7, in order to reduce the cutting stress during machining, a blade with a small tip arc of 35° and a radius of 0.4 mm is used for machining, the feed rate is 0.05 mm / r, and the cutting depth is 0.2 mm.

[0066] Furthermore, in step S5, since the part is too long, the tool is connected in the middle of half of the inner hole, and the tool is connected in advance and obliquely when processing the other half of the inner hole, so as to avoid the phenomenon of digging by the damping tool rod when the part margin changes suddenly.

[0067] Furthermore, in the steps S3 and S6, the rough machining of the outer circle and the inner hole both reserve a machining allowance of 0.2 mm for subsequent fine machining.

[0068] Furthermore, in the steps S3 and S5, if the inner hole cutting linear speed is too fast, the tool chattering phenomenon is likely to occur. Through workshop experiments, it was found that the tool chattering phenomenon would be significantly reduced only when the inner hole cutting linear speed is reduced from 60m / min to 28.65m / min, so the inner hole cutting linear speed is set to 28.65m / min.

[0069] Furthermore, in the steps S6 and S7, the outer circle cutting linear speed is 50 m / min.

[0070] Furthermore, the step S10 includes using fluorescence detection to check whether there are defects on the surface of the part and size detection to check whether the size data of the part is within the tolerance range.

[0071] The thin-walled tubular shaft parts processed by the above method have processing dimensions that meet tolerance requirements and do not require subsequent repair work, thus saving time for part repair.

[0072] Example 2

[0073] This embodiment discloses a method for controlling the wall thickness difference of thin-walled tubular shaft parts during turning. This embodiment specifically relates to a thin-walled tubular shaft made of high-temperature alloy GH4169. Compared with embodiment 1, there are also the following different process conditions: a 40mm diameter damping tool bar is used for processing; the standard for fluorescence inspection complies with HB / Z61, and defects displayed by fluorescence are not allowed. The specific processing steps are:

[0074] S1. Rough machining of blank: machine the end face and outer circle of the part separately.

[0075] S3. Inner hole rough machining: Use a deep hole drilling machine to drill the bottom hole to a diameter of 50mm with a tolerance range of +0.1 to 0.

[0076] S2. Solution aging: first perform solution treatment on the parts, and then perform aging treatment on the parts. Furthermore, during the solution treatment, the parts are hung vertically, kept at 790°C for 3 hours, then heated to 985°C, and then kept for 3 hours and 40 minutes, and then oil-cooled; during the aging treatment, the parts are hung vertically, heated to 725°C, kept for 8.5 hours, cooled to 625°C, and then kept for 8.5 hours, and cooled to 100°C with argon gas, which can effectively eliminate stress, improve material properties, and increase material strength. Furthermore, in the steps S3 and S6, in order to reduce the cutting stress during processing, a blade with a small tip arc of 35° and a radius of 0.8mm is used for processing, and the feed amount is 0.03mm.

[0077] S4. Stabilization treatment: Hang the parts in a heating furnace; heat to 560℃ and keep warm for 4 hours; then leave them to cool naturally in air.

[0078] S5. Inner hole finishing: Use CNC lathe, through differential method and segmented programming method, set several positioning points on the surface of the part, divide the whole cylindrical surface into 4 cylindrical surfaces with a length of 100mm through the positioning points, measure the wall thickness of each cylindrical surface, adjust the feed amount of the next section according to the measurement result, and turn around and process the inner hole to a diameter of 56.95mm in two sections, with a tolerance range of +0.05 to 0, and turn around and process in two sections;

[0079] S6. External rough machining: Use CNC horizontal lathe to remove external circle allowance and leave finishing allowance on one side;

[0080] S7. External cylindrical finishing: Using a CNC lathe, through the differential method and segmented programming method, several positioning points are set on the surface of the part, and the entire cylindrical surface is evenly divided into 4 cylindrical surfaces with a length of 100 mm through the positioning points. The wall thickness is measured after each section of the cylindrical surface is processed, and the feed amount of the next section is adjusted according to the measurement results. The external cylindrical surface is finished and finished to a diameter of 60.7 mm with a tolerance range of 0 to -0.05;

[0081] S8. Milling keyway: Milling the outer circle and end face keyway on the CNC five-axis machining center;

[0082] S9. Deburring: Bench workers use grinding milling cutters, sandpaper, and flap wheels to remove all burrs after processing;

[0083] S10.Inspection: Inspect whether the parts meet the standards.

[0084] The thin-walled tubular shaft parts processed by the above method have uniform processing dimensions and meet the tolerance requirements, and no subsequent repair work is required.

[0085] Example 3

[0086] The difference between this embodiment and embodiment 1 is that for thin-walled tubular shaft parts with different lengths from embodiment 1, positioning points are set according to the length of the parts and the value of the change in the diameter of the inner hole. If the change in the diameter of the inner hole over a length of 30 mm exceeds half of the wall thickness tolerance, adjustments need to be made at every 30 mm length interval. If the change in the diameter of the inner hole over a length of 50 mm exceeds half of the wall thickness tolerance, adjustments need to be made at every 50 mm length interval to set positioning points, and the same method is used for turning.

[0087] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0088] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for controlling the wall thickness difference of thin-walled tubular shaft parts during turning, characterized in that: The processing of the thin-walled tubular shaft parts is carried out according to the following steps: S1. Rough machining of blank: machining the end face and outer circle of the part respectively; S2. Solution aging: firstly treat the parts with solution, then treat the parts with aging; S3. Inner hole rough processing: Use deep hole drilling machine to drill the bottom hole; S4. Stabilization treatment: hang the parts in a heating furnace, heat to 540℃-560℃, keep warm for 3 hours and 30 minutes to 4 hours, and then place them in natural air for cooling; S5. Inner hole finishing: Use a CNC lathe, through the differential method and segmented programming method, set several positioning points on the surface of the part, and evenly divide the entire cylindrical surface into multiple cylindrical surfaces of a certain length through the positioning points. Measure the wall thickness of each cylindrical surface of a certain length, adjust the feed amount of the next section according to the measurement result to ensure that the wall thickness difference is within a reasonable tolerance range, and turn the processing in two sections; S6. External rough machining: Use CNC horizontal lathe to remove external circle allowance and leave finishing allowance on one side; S7. External cylindrical finishing: Using a CNC horizontal lathe, through the differential method and segmented programming method, several positioning points are set on the surface of the part, and the entire cylindrical surface is evenly divided into multiple cylindrical surfaces of a certain length through the positioning points. The wall thickness of each cylindrical surface of a certain length is measured, and the feed amount of the next section is adjusted according to the measurement result, and the external cylindrical surface is finished to within the tolerance range; S8. Milling keyway: Milling the outer circle and end face keyway on the CNC five-axis machining center; S9. Deburring: Bench workers grind and mill to remove all burrs after processing; S10.Inspection: Inspect whether the parts meet the standards.

2. A method for controlling wall thickness difference in turning thin-walled tubular shaft parts according to claim 1, characterized in that: In step S1, the part is first clamped with a hard jaw, the part is supported by a center frame, the end face of the part is turned and a center hole is punched; Then, the part is clamped with hard jaws, supported with a center, and the outer circle of the part is turned to a length of 700 mm; Turn the part around, clamp the outer circle of the part with hard jaws, support the part with a center stand, turn the other end face of the part and drill a top hole; The part is then clamped with hard jaws, with the center supporting the outer circle of the unprocessed part of the turned part.

3. The method for controlling wall thickness difference of thin-walled tubular shaft parts during turning according to claim 1, characterized in that: In the step S2, when the solution treatment is carried out, the parts are hung vertically, kept at 770°C-790°C for 2 hours and 30 minutes to 3 hours, then heated to 965°C-985°C, kept at this temperature for 3 hours and 10 minutes to 3 hours and 40 minutes, and then oil-cooled; during the aging treatment, the parts are hung vertically, heated to 715°C-725°C, kept at this temperature for 8 hours to 8.5 hours, cooled to 615°C-625°C, kept at this temperature for 8 hours to 8.5 hours, and cooled to below 100°C by passing argon gas.

4. The method for controlling wall thickness difference of thin-walled tubular shaft parts during turning according to claim 1, characterized in that: In the steps S3 and S6, a blade with a small tip arc of 35° and a radius of 0.8 mm is used for processing, the feed rate is 0.1 mm / r, and the cutting depth is 0.7 mm.

5. The method for controlling wall thickness difference of thin-walled tubular shaft parts during turning according to claim 1, characterized in that: In the steps S5 and S7, a blade with a small tip arc of 35° and a radius of 0.4 mm is used for processing, the feed rate is 0.05 mm / r, and the cutting depth is 0.2 mm.

6. The method for controlling wall thickness difference of thin-walled tubular shaft parts during turning according to claim 1, characterized in that: In step S5, the processing is performed by cutting in the middle of one half of the inner hole, and the processing is performed by withdrawing the tool in advance and withdrawing the tool in an oblique line when processing the other half of the inner hole.

7. The method for controlling wall thickness difference of thin-walled tubular shaft parts during turning according to claim 1, characterized in that: In the steps S3 and S6, the rough machining of the outer circle and the inner hole both reserve a machining allowance of 0.2 mm for subsequent fine machining.

8. The method for controlling wall thickness difference of thin-walled tubular shaft parts during turning according to claim 1, characterized in that: In the steps S3 and S5, the inner hole cutting linear speed is 28.65 m / min.

9. The method for controlling wall thickness difference of thin-walled tubular shaft parts during turning according to claim 1, characterized in that: In the steps S6 and S7, the outer circle cutting linear speed is 50 m / min.

10. A method for controlling the wall thickness difference of thin-walled tubular shaft parts during turning, characterized in that: The step S10 includes fluorescence detection and size detection.

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