A processing method for ring-shaped thin-walled parts

Abstract

The application discloses a kind of ring class thin-walled part machining methods, to solve the insufficient deformation of ring class thin-walled part machining process.The present application comprises the following steps: S1, drilling on blank, and rough machining hole is reamed, and inner hole is reserved processing allowance;S2, blank heat treatment;S3, blank clamping is processed on lathe, including the following steps: a, rough machining blank end face, outer diameter surface, inner diameter surface, outer wall groove;B, outer cutting knife is pre-cut to blank outer wall;C, finish machining outer wall groove and end face;D, outer diameter surface and inner diameter surface semi-finishing;E, inner groove cutter is cut to the inner wall corresponding to blank pre-cut, and the radial cutting depth of inner groove cutter coincides with the radial cutting depth of outer cutting knife;F, finish machining outer diameter surface and inner diameter surface;G, blank is discharged to form workpiece.Ring class thin-walled part machining process is not easy to deform, reduces process circulation, improves processing efficiency and precision.

Description

Technical Field

[0001] This invention relates to a component processing technology, and more specifically, to a method for processing ring-shaped thin-walled components. Background Technology

[0002] Currently, a common problem in the machining of thin-walled ring parts is machining deformation. Due to the thin wall thickness of these parts, coaxiality issues frequently occur during machining. The machining process is lengthy and inefficient, requiring tool changes, which not only reduces efficiency but also leads to error accumulation and decreased machining accuracy. Furthermore, the significant impact force generated during workpiece cutting causes substantial deformation, making it impossible to guarantee the inner and outer diameter dimensions of the workpiece. Summary of the Invention

[0003] To overcome the above shortcomings, the present invention provides a method for processing ring-shaped thin-walled parts. The ring-shaped thin-walled parts are not easily deformed during processing, reducing the number of processes and improving processing efficiency and accuracy.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a method for processing ring-shaped thin-walled parts, comprising the following steps:

[0005] S1, Drill holes in the blank and rough machine the inner hole to enlarge it, leaving a machining allowance in the inner hole;

[0006] S2, the billet undergoes heat treatment to remove internal stress;

[0007] S3, the blank is clamped on the lathe for machining, including the following steps:

[0008] a. Rough machining of the blank end face, outer diameter surface, inner diameter surface, and outer wall groove;

[0009] b. The outer cutting blade pre-cuts the outer wall of the billet;

[0010] c. Finish the outer wall grooves and end faces;

[0011] d. Semi-finishing of outer and inner diameter surfaces;

[0012] e. The inner groove blade cuts the inner wall corresponding to the pre-cutting point of the billet, and the radial cutting depth of the inner groove blade coincides with the radial cutting depth of the outer cutting blade.

[0013] f. Finish the outer and inner diameter surfaces;

[0014] g. Blanking to form a workpiece.

[0015] In step S1, after enlarging the inner hole and leaving machining allowance, the material stress is released to the maximum extent during the heat treatment process to remove internal stress, resulting in good stress relief. The entire machining process is divided into roughing, semi-finishing, and finishing, with multiple machining steps, which improves machining accuracy. All processes in step S3 are completed on the same fixture, reducing process flow and avoiding errors caused by fixture switching. Because the workpiece material has a certain degree of toughness, the radial cutting depth of the inner groove tool coincides with the radial cutting depth of the outer cutting tool, preventing the workpiece from falling off. This cutting method effectively avoids stress generated during cutting, preventing dimensional deformation during finishing. Finishing the outer and inner diameter surfaces in a single process effectively controls the coaxiality of the inner and outer diameters. The machining process for thin-walled ring-shaped parts is less prone to deformation, reducing process flow and improving machining efficiency and accuracy.

[0016] Preferably, the cut surface of the workpiece is machined after S3 to complete the finishing of the axial length of the workpiece.

[0017] After precision machining of the cut surfaces of the workpiece, the overall length of the workpiece meets the design requirements.

[0018] As a preferred option, bar stock is used as the blank. In process S3, after the previous workpiece is unloaded, steps a to g are repeated to process the next workpiece, thereby achieving continuous processing.

[0019] By using bar stock for workpiece processing, continuous processing is achieved, resulting in high work efficiency.

[0020] As a preferred option, in step S1, a clamping section is reserved at the rear end of the blank, and when the inner hole is rough-machined and enlarged, the enlargement is performed from the front end of the inner hole to the front end of the clamping section.

[0021] The inner hole corresponding to the clamping section is not rough-machined or enlarged, ensuring the structural strength of the clamping section and preventing deformation at that location when the workpiece is clamped, thus avoiding any impact on the workpiece's machining accuracy. Furthermore, the inner hole penetrates the workpiece, ensuring the effective stress relief during subsequent heat treatment.

[0022] As a preferred option, the inner hole of S1 has a machining allowance of 1.5-3mm.

[0023] After enlarging the inner hole, leave a small machining allowance so that the material stress can be released to the greatest extent during stress-relieving heat treatment.

[0024] Preferably, the width of the outer cutting blade is greater than the width of the inner groove blade, and the inner groove blade moves axially to perform multi-blade cutting during cutting.

[0025] The inner groove cutter makes multiple cuts with low processing resistance, and the cutting process does not affect the relevant dimensions, thus avoiding workpiece distortion.

[0026] Preferably, before step g, the inner groove cutter cuts the inner wall corresponding to the pre-cut part of the billet again.

[0027] Before unloading the workpiece, the inner groove tool makes an additional cut to ensure that the workpiece can be reliably unloaded in step g.

[0028] Preferably, in step g, the workpiece is unloaded by gently tapping it with a hammer, and the workpiece is caught by hand during unloading.

[0029] The workpiece is unloaded by tapping it lightly and then caught by hand, effectively avoiding the workpiece damage and safety hazards caused by the original cutting method.

[0030] In another approach, step g involves using a cutting fixture to cut the workpiece. The cutting fixture includes a cutting sleeve with an airbag sleeve installed on its outer wall. Several air blowing holes are spaced circumferentially on the outer wall of the cutting sleeve. When the workpiece is cut, the cutting sleeve moves to allow the airbag sleeve to enter the inner hole of the workpiece. The air blowing holes face the cutting point at the rear end of the workpiece. First, high-pressure airflow is delivered to the air blowing holes. The airflow impacts the cutting point at the rear end of the workpiece through the air blowing holes, causing the workpiece to be completely cut off. Then, high-pressure airflow is delivered to the airbag sleeve to inflate the airbag sleeve and tighten the workpiece. After that, the cutting sleeve returns to its original position and the airbag sleeve is deflated. Finally, the workpiece is removed from the cutting sleeve.

[0031] During the workpiece unloading operation, the unloading sleeve is inserted into the inner hole of the workpiece, with the air blowing hole facing the cutting point at the rear end of the workpiece, and the airbag sleeve corresponding to the inner hole. First, high-pressure airflow is delivered to the air blowing hole, impacting the cutting point at the rear end of the workpiece and completely cutting it off. Then, high-pressure airflow is delivered to the airbag sleeve, causing it to inflate and tighten the workpiece. At this point, the airbag sleeve secures the workpiece. Afterward, the unloading sleeve returns to its original position, and the workpiece is unloaded during this process. Even if the workpiece is still attached to the blank, the workpiece is tightened by the airbag sleeve during the unloading sleeve's return, allowing it to be unloaded along with the airbag sleeve. Afterward, the airbag sleeve is deflated, and the workpiece is removed from the unloading sleeve. This unloading method eliminates the need to strike the workpiece, avoiding damage caused by hammering. Furthermore, the next workpiece can be processed immediately after the unloading sleeve returns to its original position, significantly improving work efficiency.

[0032] Preferably, the unloading sleeve is rotated, and while the air blowing hole blows air towards the cutting end of the workpiece, the unloading sleeve deflects at one end; after the airbag sleeve bulges out and tightens the workpiece, the unloading sleeve deflects at a certain angle.

[0033] While the air blowing hole blows air towards the cutting point at the rear end of the workpiece, the material feeding sleeve deflects at one end to ensure that all positions at the cutting point of the workpiece are impacted by the airflow, thus guaranteeing the cutting effect.

[0034] After the airbag sleeve inflates and tightens the workpiece, the unloading sleeve deflects at a certain angle. If the cutting point is not cut by the airflow, the workpiece can also deflect during the deflection of the unloading sleeve as the airbag sleeve tightens the workpiece, thus completely cutting the workpiece.

[0035] Compared with the prior art, the beneficial effects of the present invention are: (1) the ring-shaped thin-walled parts are not easily deformed during the processing, which reduces the number of process steps and improves the processing efficiency and accuracy; (2) the inner hole corresponding to the clamping section is not rough-machined and enlarged, which ensures the structural strength of the clamping section position and avoids deformation at the clamping section position when the blank is clamped, thereby affecting the processing accuracy of the workpiece. The inner hole penetrates the blank, ensuring the stress relief effect of subsequent heat treatment; (3) The workpiece is first pre-cut with an outer cutting tool, and then cut with an inner groove tool. The radial cutting depth of the inner groove tool coincides with the radial cutting depth of the outer cutting tool. The workpiece will not fall off. This cutting method effectively avoids the stress generated by cutting, which leads to the deformation of the finished size; (4) The workpiece is unloaded by tapping it lightly. The workpiece is caught by hand, which effectively avoids the workpiece being damaged and the safety hazards caused by the original cutting processing method; (5) The workpiece is unloaded by using a blanking fixture. There is no need to knock the workpiece, which can avoid the damage caused by knocking; and the next workpiece can be processed immediately after the blanking sleeve returns to its original position. The next workpiece is processed at the same time as the workpiece is removed, which greatly improves the work efficiency. Attached Figure Description

[0036] Figure 1 This is a process diagram of the present invention;

[0037] Figure 2 This is a schematic diagram illustrating the workpiece cutting principle of the present invention;

[0038] Figure 3 This is a workpiece structure diagram of Embodiment 1 of the present invention;

[0039] Figure 4 This is a workpiece structure diagram of Embodiment 2 of the present invention;

[0040] Figure 5 This is a workpiece structure diagram of Embodiment 3 of the present invention;

[0041] Figure 6 This is a workpiece structure diagram of Embodiment 4 of the present invention;

[0042] Figure 7 This is a schematic diagram of the unloading tooling in Embodiment 5 of the present invention;

[0043] Figure 8 It is a process diagram with scale.

[0044] In the diagram: 1. Billet, 2. Inner hole, 3. Clamping section, 4. Outer wall groove, 5. Outer cutting blade, 6. Inner groove blade, 7. Workpiece, 8. Convex ring, 9. Chamfer, 10. Rounded corner, 11. Unloading sleeve, 12. Slide, 13. Slide seat, 14. Screw, 15. Airbag sleeve, 16. Air blowing hole, 17. End cap, 18. Accumulator ring groove, 19. Air supply hole, 20. Inflation hole, 21. Electrically controlled directional valve, 22. Drive gear, 23. Driven gear, 24. Unloading piston cylinder, 25. Buffer block. Detailed Implementation

[0045] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0046] Example 1: A method for processing thin-walled ring-shaped parts (see appendix) Figure 1 Appendix Figure 2 ), including the following steps:

[0047] S1, Drill holes in the blank 1 and rough machine the inner hole 2. Leave a machining allowance for the inner hole 2, which is 1.5-3mm. In this embodiment, 2mm is reserved. The blank 1 is made of bar stock. A clamping section 3 is reserved at the rear end of the blank 1. When rough machining the inner hole 2, the hole is enlarged from the front end of the inner hole 2 to the front end of the clamping section 3. The axial length of the clamping section 3 is 10mm. The clamping section 3 is set to prevent the clamping force during clamping from deforming the workpiece 7.

[0048] S2, the billet 1 is heat-treated to remove internal stress;

[0049] S3, the blank 1 is clamped on a CNC lathe for machining, including the following steps:

[0050] a. Rough machining of blank 1 end face, outer diameter surface, inner diameter surface, outer wall groove 4;

[0051] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0052] c. Finish the outer wall groove 4 and end face;

[0053] d. Semi-finishing of outer and inner diameter surfaces; allowance of 0.1mm in the diameter direction;

[0054] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0055] f. Finish the outer and inner diameter surfaces;

[0056] g. Blank 1 is cut into workpiece 7.

[0057] After step S3, the cut surface of workpiece 7 is machined to complete the finishing of the axial length of workpiece 7. The blank 1 is made of bar stock. During step S3, after the previous workpiece 7 is unloaded, steps a to g are repeated to process the next workpiece 7, achieving continuous machining.

[0058] In step g, workpiece 7 is unloaded by gently tapping it with a hammer, and the workpiece 7 is caught by hand during unloading. The hammer is wrapped with gauze for protection and a rubber hammer is used for tapping. Before step g, the connection at the cut of workpiece 7 is observed. When the connection at the cut is found to be relatively firm, the inner groove cutter 6 cuts the inner wall corresponding to the pre-cut point of the blank 1 again to make the cut point easier to break by tapping.

[0059] Specifically, in this embodiment, three grooves are provided on the outer wall of the processed ring-shaped thin-walled part, such as... Figure 3 As shown, the middle groove is relatively deep, and the two ends of the ring-shaped thin-walled part are provided with raised rings 8 near the edge of the inner hole 2. The process of machining the S3 blank 1 on a CNC lathe includes the following steps:

[0060] a. Roughly machine the end face, outer diameter surface, inner diameter surface, and outer wall groove 4 of the blank 1 in sequence. All three outer wall grooves 4 are rough machined. During rough machining, a convex ring 8 is machined on the outer end face.

[0061] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0062] c. Finish the outer wall groove 4 and end face;

[0063] d. Semi-finishing of outer and inner diameter surfaces; allowance of 0.1mm in the diameter direction;

[0064] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0065] f. Finish the outer and inner diameter surfaces;

[0066] g. Blank 1 is cut into workpiece 7.

[0067] After S3, the cutting surface of workpiece 7 is processed to complete the finishing of the rear end face of workpiece 7 and the protruding ring 8 on the rear end face. After the finishing of the rear end face, the protruding ring 8 on the rear end face of workpiece 7 is machined, thereby completing the finishing of the axial length of workpiece 7.

[0068] In step S1, after enlarging the inner hole 2 and leaving a machining allowance, the material stress is released to the maximum extent during the heat treatment process to remove internal stress, resulting in a good stress relief effect. The entire machining process is divided into roughing, semi-finishing, and finishing, with multiple machining steps, which can improve machining accuracy. All the steps in step S3 are completed on the same fixture, reducing process flow and avoiding errors caused by fixture switching. Because the workpiece 7 material has a certain toughness, the radial cutting depth of the inner groove cutter 6 coincides with the radial cutting depth of the outer cutting cutter 5, and the workpiece 7 will not fall off. This cutting method effectively avoids the stress generated by cutting, which could lead to dimensional deformation after finishing. The outer diameter surface and the inner diameter surface are finished in one step, which can effectively control the coaxiality of the inner and outer diameters. The machining process of ring-shaped thin-walled parts is not prone to deformation, reducing process flow and improving machining efficiency and accuracy.

[0069] Example 2: A method for processing thin-walled ring-shaped parts (see appendix) Figure 1 Appendix Figure 2 ), including the following steps:

[0070] S1, Drill holes in the blank 1 and rough machine the inner hole 2. Leave a machining allowance for the inner hole 2, which is 1.5-3mm. In this embodiment, 2mm is reserved. The blank 1 is made of bar stock. A clamping section 3 is reserved at the rear end of the blank 1. When rough machining the inner hole 2, the hole is enlarged from the front end of the inner hole 2 to the front end of the clamping section 3. The axial length of the clamping section 3 is 10mm. The clamping section 3 is set to prevent the clamping force during clamping from deforming the workpiece 7.

[0071] S2, the billet 1 is heat-treated to remove internal stress;

[0072] S3, the blank 1 is clamped on a CNC lathe for machining, including the following steps:

[0073] a. Rough machining of blank 1 end face, outer diameter surface, inner diameter surface, outer wall groove 4;

[0074] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0075] c. Finish the outer wall groove 4 and end face;

[0076] d. Semi-finishing of outer and inner diameter surfaces; allowance of 0.1mm in the diameter direction;

[0077] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0078] f. Finish the outer and inner diameter surfaces;

[0079] g. Blank 1 is cut into workpiece 7.

[0080] After step S3, the cut surface of workpiece 7 is machined to complete the finishing of the axial length of workpiece 7. The blank 1 is made of bar stock. During step S3, after the previous workpiece 7 is unloaded, steps a to g are repeated to process the next workpiece 7, achieving continuous machining.

[0081] In step g, workpiece 7 is unloaded by gently tapping it with a hammer, and the workpiece 7 is caught by hand during unloading. The hammer is wrapped with gauze for protection and a rubber hammer is used for tapping. Before step g, the connection at the cut of workpiece 7 is observed. When the connection at the cut is found to be relatively firm, the inner groove cutter 6 cuts the inner wall corresponding to the pre-cut point of the blank 1 again to make the cut point easier to break by tapping.

[0082] Specifically, in this embodiment, a groove is provided on the outer wall of the processed ring-shaped thin-walled part, such as... Figure 4 As shown, the middle groove is relatively deep, and the outer edge of the inner end face of the ring-shaped thin-walled part is chamfered at 9°. The process of machining S3 blank 1 on a CNC lathe includes the following steps:

[0083] a. Roughly machine the end face, outer diameter surface, inner diameter surface, and outer wall groove 4 of the blank in sequence;

[0084] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0085] c. Finish the outer wall groove 4 and end face;

[0086] d. Semi-finishing of outer and inner diameter surfaces; allowance of 0.1mm in the diameter direction;

[0087] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0088] f. Finish the outer and inner diameter surfaces;

[0089] g. Blank 1 is cut into workpiece 7.

[0090] After S3, the cutting surface of workpiece 7 is processed to complete the finishing of the rear end face of workpiece 7 and the chamfer 9 on the rear end face. After the finishing of the rear end face, the chamfer 9 on the rear end face of workpiece 7 is processed, thereby completing the finishing of the axial length of workpiece 7.

[0091] In step S1, after enlarging the inner hole 2 and leaving a machining allowance, the material stress is released to the maximum extent during the heat treatment process to remove internal stress, resulting in a good stress relief effect. The entire machining process is divided into roughing, semi-finishing, and finishing, with multiple machining steps, which can improve machining accuracy. All the steps in step S3 are completed on the same fixture, reducing process flow and avoiding errors caused by fixture switching. Because the workpiece 7 material has a certain toughness, the radial cutting depth of the inner groove cutter 6 coincides with the radial cutting depth of the outer cutting cutter 5, and the workpiece 7 will not fall off. This cutting method effectively avoids the stress generated by cutting, which could lead to dimensional deformation after finishing. The outer diameter surface and the inner diameter surface are finished in one step, which can effectively control the coaxiality of the inner and outer diameters. The machining process of ring-shaped thin-walled parts is not prone to deformation, reducing process flow and improving machining efficiency and accuracy.

[0092] Example 3: A method for processing thin-walled ring-shaped parts (see appendix) Figure 1 Appendix Figure 2 ), including the following steps:

[0093] S1, Drill holes in the blank 1 and rough machine the inner hole 2. Leave a machining allowance for the inner hole 2, which is 1.5-3mm. In this embodiment, 2mm is reserved. The blank 1 is made of bar stock. A clamping section 3 is reserved at the rear end of the blank 1. When rough machining the inner hole 2, the hole is enlarged from the front end of the inner hole 2 to the front end of the clamping section 3. The axial length of the clamping section 3 is 10mm. The clamping section 3 is set to prevent the clamping force during clamping from deforming the workpiece 7.

[0094] S2, the billet 1 is heat-treated to remove internal stress;

[0095] S3, the blank 1 is clamped on a CNC lathe for machining, including the following steps:

[0096] a. Rough machining of blank 1 end face, outer diameter surface, inner diameter surface, outer wall groove 4;

[0097] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0098] c. Finish the outer wall groove 4 and end face;

[0099] d. Semi-finishing of outer and inner diameter surfaces; allowance of 0.1mm in the diameter direction;

[0100] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0101] f. Finish the outer and inner diameter surfaces;

[0102] g. Blank 1 is cut into workpiece 7.

[0103] After step S3, the cut surface of workpiece 7 is machined to complete the finishing of the axial length of workpiece 7. The blank 1 is made of bar stock. During step S3, after the previous workpiece 7 is unloaded, steps a to g are repeated to process the next workpiece 7, achieving continuous machining.

[0104] In step g, workpiece 7 is unloaded by gently tapping it with a hammer, and the workpiece 7 is caught by hand during unloading. The hammer is wrapped with gauze for protection and a rubber hammer is used for tapping. Before step g, the connection at the cut of workpiece 7 is observed. When the connection at the cut is found to be relatively firm, the inner groove cutter 6 cuts the inner wall corresponding to the pre-cut point of the blank 1 again to make the cut point easier to break by tapping.

[0105] Specifically, in this embodiment, four grooves are provided on the outer wall of the processed ring-shaped thin-walled part, such as... Figure 5 As shown, the two middle grooves are continuously arranged in a stepped shape. The outer edges of both ends of the ring-shaped thin-walled part are rounded with 10, and the inner edge of the rear end face of the ring-shaped thin-walled part is provided with a raised ring 8. The process of clamping the S3 blank 1 on the CNC lathe for machining includes the following steps:

[0106] a. Roughly machine the end face, outer diameter surface, inner diameter surface, and outer wall groove 4 of the blank 1 in sequence. All four outer wall grooves 4 are rough machined.

[0107] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0108] c. Finish the outer wall groove 4 and end face, and machine the rounded corner 10 of the outer end face edge;

[0109] d. Semi-finishing of outer and inner diameter surfaces; allowance of 0.1mm in the diameter direction;

[0110] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0111] f. Finish the outer and inner diameter surfaces;

[0112] g. Blank 1 is cut into workpiece 7.

[0113] After S3, the cutting surface of workpiece 7 is processed to complete the finishing of the rear end face of workpiece 7 and the convex ring 8 and fillet 10 on the rear end face. After the finishing of the rear end face, the convex ring 8 and the fillet 10 on the edge of the rear end face of workpiece 7 are processed, thereby completing the finishing of the axial length of workpiece 7.

[0114] In step S1, after enlarging the inner hole 2 and leaving a machining allowance, the material stress is released to the maximum extent during the heat treatment process to remove internal stress, resulting in a good stress relief effect. The entire machining process is divided into roughing, semi-finishing, and finishing, with multiple machining steps, which can improve machining accuracy. All the steps in step S3 are completed on the same fixture, reducing process flow and avoiding errors caused by fixture switching. Because the workpiece 7 material has a certain toughness, the radial cutting depth of the inner groove cutter 6 coincides with the radial cutting depth of the outer cutting cutter 5, and the workpiece 7 will not fall off. This cutting method effectively avoids the stress generated by cutting, which could lead to dimensional deformation after finishing. The outer diameter surface and the inner diameter surface are finished in one step, which can effectively control the coaxiality of the inner and outer diameters. The machining process of ring-shaped thin-walled parts is not prone to deformation, reducing process flow and improving machining efficiency and accuracy.

[0115] Example 4: A method for processing thin-walled ring-shaped parts (see appendix) Figure 1 Appendix Figure 2 ), including the following steps:

[0116] S1, Drill holes in the blank 1 and rough machine the inner hole 2. Leave a machining allowance for the inner hole 2, which is 1.5-3mm. In this embodiment, 2mm is reserved. The blank 1 is made of bar stock. A clamping section 3 is reserved at the rear end of the blank 1. When rough machining the inner hole 2, the hole is enlarged from the front end of the inner hole 2 to the front end of the clamping section 3. The axial length of the clamping section 3 is 10mm. The clamping section 3 is set to prevent the clamping force during clamping from deforming the workpiece 7.

[0117] S2, the billet 1 is heat-treated to remove internal stress;

[0118] S3, the blank 1 is clamped on a CNC lathe for machining, including the following steps:

[0119] a. Rough machining of blank 1 end face, outer diameter surface, inner diameter surface, outer wall groove 4;

[0120] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0121] c. Finish the outer wall groove 4 and end face;

[0122] d. Semi-finishing of outer and inner diameter surfaces; allowance of 0.1mm in the diameter direction;

[0123] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0124] f. Finish the outer and inner diameter surfaces;

[0125] g. Blank 1 is cut into workpiece 7.

[0126] After step S3, the cut surface of workpiece 7 is machined to complete the finishing of the axial length of workpiece 7. The blank 1 is made of bar stock. During step S3, after the previous workpiece 7 is unloaded, steps a to g are repeated to process the next workpiece 7, achieving continuous machining.

[0127] In step g, workpiece 7 is unloaded by gently tapping it with a hammer, and the workpiece 7 is caught by hand during unloading. The hammer is wrapped with gauze for protection and a rubber hammer is used for tapping. Before step g, the connection at the cut of workpiece 7 is observed. When the connection at the cut is found to be relatively firm, the inner groove cutter 6 cuts the inner wall corresponding to the pre-cut point of the blank 1 again to make the cut point easier to break by tapping.

[0128] Specifically, in this embodiment, three grooves are provided on the outer wall of the processed ring-shaped thin-walled part, such as... Figure 6 As shown, the middle groove is relatively deep, and its cross-section is a right-angled trapezoidal structure. The outer edges of both ends of the ring-shaped thin-walled part are chamfered (9), and the inner edge of the front face of the ring-shaped thin-walled part is provided with a raised ring (8). The inner wall of workpiece 7 has a stepped structure. The process of machining S3 blank 1 on a CNC lathe includes the following steps:

[0129] a. Roughly machine the end face, outer diameter surface, inner diameter surface, and outer wall groove 4 of the blank 1 in sequence. All three outer wall grooves 4 are rough machined.

[0130] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0131] c. Finish the outer wall groove 4 and end face, and machine the chamfer 9 on the outer edge of the outer end face and the convex ring 8 on the inner edge;

[0132] d. Semi-finishing of outer and inner diameter surfaces; a stepped structure is machined on the inner diameter surface, with a 0.1mm allowance in the diameter direction;

[0133] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0134] f. Finish the outer and inner diameter surfaces;

[0135] g. Blank 1 is cut into workpiece 7.

[0136] After S3, the cutting surface of workpiece 7 is processed to complete the finishing of the rear end face of workpiece 7 and the chamfer 9 on the outer edge of the rear end face, thereby completing the finishing of the axial length of workpiece 7.

[0137] In step S1, after enlarging the inner hole 2 and leaving a machining allowance, the material stress is released to the maximum extent during the heat treatment process to remove internal stress, resulting in a good stress relief effect. The entire machining process is divided into roughing, semi-finishing, and finishing, with multiple machining steps, which can improve machining accuracy. All the steps in step S3 are completed on the same fixture, reducing process flow and avoiding errors caused by fixture switching. Because the workpiece 7 material has a certain toughness, the radial cutting depth of the inner groove cutter 6 coincides with the radial cutting depth of the outer cutting cutter 5, and the workpiece 7 will not fall off. This cutting method effectively avoids the stress generated by cutting, which could lead to dimensional deformation after finishing. The outer diameter surface and the inner diameter surface are finished in one step, which can effectively control the coaxiality of the inner and outer diameters. The machining process of ring-shaped thin-walled parts is not prone to deformation, reducing process flow and improving machining efficiency and accuracy.

[0138] Example 5: A method for processing thin-walled ring-shaped parts (see appendix) Figure 1 Appendix Figure 2 ), including the following steps:

[0139] S1, Drill holes in the blank 1 and rough machine the inner hole 2. Leave a machining allowance for the inner hole 2, which is 1.5-3mm. In this embodiment, 2mm is reserved. The blank 1 is made of bar stock. A clamping section 3 is reserved at the rear end of the blank 1. When rough machining the inner hole 2, the hole is enlarged from the front end of the inner hole 2 to the front end of the clamping section 3. The axial length of the clamping section 3 is 10mm. The clamping section 3 is set to prevent the clamping force during clamping from deforming the workpiece 7.

[0140] S2, the billet 1 is heat-treated to remove internal stress;

[0141] S3, the blank 1 is clamped on a CNC lathe for machining, including the following steps:

[0142] a. Rough machining of blank 1 end face, outer diameter surface, inner diameter surface, outer wall groove 4;

[0143] b. The outer cutting blade 5 pre-cuts the outer wall of the billet 1; the width of the outer cutting blade 5 is 3mm, and after the outer cutting blade 5 pre-cuts the outer wall of the billet 1, a cutting allowance of 2.5mm is reserved on one side.

[0144] c. Finish the outer wall groove 4 and end face;

[0145] d. Semi-finishing of outer and inner diameter surfaces; allowance of 0.1mm in the diameter direction;

[0146] e. The inner groove blade 6 cuts the inner wall corresponding to the pre-cutting point of the blank 1. The radial cutting depth of the inner groove blade 6 coincides with the radial cutting depth of the outer cutting blade 5. The width of the outer cutting blade 5 is greater than the width of the inner groove blade 6. The inner groove blade 6 moves axially to perform multiple cuts during cutting. The width of the inner groove blade 6 is 1.45mm. The inner groove blade 6 makes 3 axial cuts.

[0147] f. Finish the outer and inner diameter surfaces;

[0148] g. Blank 1 is cut into workpiece 7.

[0149] After step S3, the cut surface of workpiece 7 is machined to complete the finishing of the axial length of workpiece 7. The blank 1 is made of bar stock. During step S3, after the previous workpiece 7 is unloaded, steps a to g are repeated to process the next workpiece 7, achieving continuous machining.

[0150] In step g, a blanking fixture is used to blank workpiece 7, such as... Figure 7As shown, the unloading fixture includes an unloading sleeve 11, which is connected to a slide 12. The slide 12 is connected to a slide base 13, and a slide rail is provided on the slide base 13. The lower end of the slide 12 is slidably connected to the slide rail. A screw 14 and a motor for driving the screw 14 are installed on the slide base 13. The screw 14 is threadedly connected to the slide 12. The rotation of the screw 14 moves the slide 12, thereby moving the unloading sleeve 11. An airbag sleeve 15 is installed on the outer wall of the unloading sleeve 11. Several air blowing holes 16 are arranged circumferentially on the outer wall of the unloading sleeve 11. An end cap 17 is provided at the end of the unloading sleeve 11. A pressure accumulator ring groove 18 is provided on the end cap 17. Several air blowing holes 16 are evenly distributed circumferentially on the end cap 17, and all air blowing holes 16 are connected to the pressure accumulator ring groove 18. The feeding sleeve 11 is provided with an air supply hole 19 and an inflation hole 20. The air supply hole 19 extends to the surface of the feeding sleeve 11 for the input of high-pressure airflow, and the inflation hole 20 is used to inflate the airbag sleeve 15. An electrically controlled reversing valve 21 is installed between the air supply hole 19 and the inflation hole 20. The electrically controlled reversing valve 21 can switch between three working modes: the air supply hole 19 is connected to the inflation hole 20, the air supply hole 19 is connected to the accumulator ring groove 18, and both the inflation hole 20 and the accumulator ring groove 18 are disconnected from the air supply hole 19. The feeding sleeve 11 is rotatable, and a deflection motor is installed on the slide 12. A drive gear 22 is installed on the output shaft of the deflection motor, and a driven gear 23 is installed on the feeding sleeve 11. The drive gear 22 and the driven gear 23 mesh and transmit power. A feeding piston cylinder 24 is installed on the slide 12. The end of the telescopic rod of the feeding piston cylinder 24 is connected to a buffer block 25. The buffer block 25 is close to the end of the workpiece 7 and can play a limiting role to prevent the feeding sleeve 11 from being inserted into the workpiece 7 too deeply.

[0151] When the workpiece 7 is unloaded, the unloading sleeve 11 moves to allow the airbag sleeve 15 to enter the inner hole 2 of the workpiece 7. The air blowing hole 16 faces the cutting point at the rear end of the workpiece 7. High-pressure airflow is first delivered to the air blowing hole 16. The airflow impacts the cutting point at the rear end of the workpiece 7 through the air blowing hole 16, causing the workpiece 7 to be completely cut off. At the same time as the air blowing hole 16 blows air to the cutting point at the rear end of the workpiece 7, the unloading sleeve 11 deflects at one end of the angle in both directions. The unloading sleeve 11 deflects back and forth to ensure that the cutting is completed by the airflow impact at each position. High-pressure airflow is then supplied to the airbag sleeve 15 to inflate and tighten the workpiece 7. After the airbag sleeve 15 inflates and tightens the workpiece 7, the unloading sleeve 11 deflects at a certain angle in both directions. The unloading sleeve 11 deflects back and forth to ensure that the remaining entanglement at the cutting point of the workpiece 7 can be cut off. Then the unloading sleeve 11 returns to its original position and releases air from the airbag sleeve 15. The workpiece 7 is then removed from the unloading sleeve 11. When the workpiece 7 is removed, the extension rod of the unloading piston cylinder 24 extends and pushes the workpiece 7 in the direction of detaching from the unloading sleeve 11. It can be held directly by hand.

[0152] Comparative Example: A method for machining thin-walled ring-shaped parts (see appendix) Figure 8 ), including the following steps:

[0153] 1. Material preparation: Prepare materials according to the total length of the drawings plus 10mm;

[0154] 2. Ordinary turning-1: The ordinary turning process involves drilling through holes.

[0155] 3. Heat treatment: stress-relieving heat treatment is performed according to the material.

[0156] 4.1. CNC machining-1, ①. Rough machining of end face, outer diameter, inner diameter, and groove, ②. Pre-cutting with a 3mm wide cutting tool (leaving 2mm uncut on one side), ③. Finish machining of groove and end face, ④. Semi-finish machining of inner and outer diameters with a 0.2mm allowance in the diameter direction, ⑤. Cutting workpiece 7 with a 3mm wide cutting tool, securing workpiece 7 with a wooden stick during the cutting process;

[0157] 4.2. The reverse side step of the CNC lathe-2 is machined using a raw jaw clamp; the entire length is then precision machined.

[0158] 5.1. For the ordinary turning-2, use a jig to fit the inner diameter of the workpiece 7 onto the outer circle of the jig. Use a cover plate and screws to lock it in place. Before and after tightening the screws, use a dial indicator placed in the groove to make a dial gauge reading. The runout should be within 0.03mm. Then, finish machine the outer diameter to the correct position.

[0159] 5.2 For the ordinary lathe-3, use a jig to fit the outer diameter of the workpiece 7, which has been precision machined to the specified position, onto the inner diameter of the jig. Use a pressure block and screws to fix the workpiece 7. Before and after tightening the screws, use a dial indicator to check the outer diameter. Ensure that the runout is within 0.004mm to ensure coaxiality with the outer diameter. Then, precision machine the inner diameter to the specified position.

[0160] The above processing methods have the following problems:

[0161] ①. The conventional turning-1 process only involves drilling, and a large amount of machining allowance is processed in the CNC machining process, which has a certain impact on the accuracy of subsequent machining.

[0162] ②. In the heat treatment process, the excessive machining allowance before stress relief heat treatment affects the stress relief effect.

[0163] ③. In the CNC machining-1 process, when workpiece 7 is cut, using a wooden stick to catch it poses a safety hazard. Moreover, the impact force generated during cutting is large, causing workpiece 7 to deform significantly, which makes it impossible to guarantee the inner and outer diameter dimensions.

[0164] ④. For ordinary lathe-2, when using a jig for machining, the screws should not be tightened too much. If they are too tight, the workpiece 7 will deform; if they are too loose, the workpiece 7 will slip.

[0165] ⑤. For ordinary lathe-3, the problems are similar to those of ordinary lathe-2. The screws cannot be tightened too much, as this will cause workpiece 7 to deform, and if they are too loose, workpiece 7 will slip. Moreover, the inner and outer diameters cannot be machined at the same time, which has a significant impact on coaxiality. It is completed by manually using a dial indicator, which has a large number of unstable factors. The dial indicator reference also has the problem of deformation, which increases the difficulty of manual dial indicator use.

[0166] ⑥. The processing steps are relatively long, with 5 machining steps.

[0167] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A method for machining ring-shaped thin-walled parts, characterized in that The method comprises the following steps: S1, drilling holes on the blank and rough machining the inner hole, and reserving machining allowance for the inner hole; S2, heat treating the blank to remove internal stress; S3, clamping the blank on a lathe to process, comprising the following steps: a, rough machining the end surface, outer diameter surface, inner diameter surface and outer wall groove of the blank; b, pre-cutting the outer wall of the blank by an outer cutting-off tool; c, finishing the outer wall groove and the end surface; d, semi-finishing the outer diameter surface and the inner diameter surface; e, cutting the inner wall corresponding to the pre-cutting position of the blank by an inner groove tool, the radial cutting depth of the inner groove tool coincides with the radial cutting depth of the outer cutting-off tool; f, finishing the outer diameter surface and the inner diameter surface; g, cutting the blank to form a workpiece; a cutting tool is used to cut the blank, the cutting tool comprises a cutting sleeve, an air bag sleeve is installed on the outer wall of the cutting sleeve, and a plurality of air blowing holes are arranged on the outer wall of the cutting sleeve in a circumferential direction; the air bag sleeve is moved into the inner hole of the workpiece, high-pressure airflow is first sent to the air blowing holes, the cutting sleeve is deflected by a certain angle, the airflow is impacted on the cutting position at the rear end of the workpiece through the air blowing holes to completely cut the workpiece, and then high-pressure airflow is sent to the air bag sleeve to make the air bag sleeve expand and tightly expand the workpiece, and the cutting sleeve is deflected by a certain angle.

2. The method of claim 1, wherein the ring-shaped thin-walled member is a ring-shaped thin-walled member of a vehicle. After S3, the cutting surface of the workpiece is processed, so that the finishing of the axial length of the workpiece is completed.

3. The method of claim 1, wherein the ring-shaped thin-walled member is a ring-shaped thin-walled member of a vehicle. The blank is selected to be a bar, and steps a to g are repeated to process the next workpiece after the previous workpiece is cut, so that continuous processing is realized.

4. The method of claim 1, wherein the ring-shaped thin-walled member is a ring-shaped thin-walled member of a vehicle. In S1, a clamping section is reserved at the rear end of the blank, and the inner hole is rough machined and expanded from the front end of the inner hole to the front end of the clamping section.

5. The method of claim 1, wherein the ring-shaped thin-walled member is a ring-shaped thin-walled member of a vehicle. The inner hole is reserved with a machining allowance of 1.5-3mm.

6. The method of claim 1, wherein the ring-shaped thin-walled member is a ring-shaped thin-walled member of a vehicle. The width of the outer cutting-off tool is greater than that of the inner groove tool, and the inner groove tool is cut in multiple cutting positions in the axial direction.

7. The method of claim 1, wherein the ring-shaped thin-walled member is a ring-shaped thin-walled member of a vehicle. Before step g, the inner groove tool cuts the inner wall corresponding to the pre-cutting position of the blank again.

8. The method according to any one of claims 1 to 7, wherein the ring-shaped thin-walled member is a ring-shaped thin-walled member having a thickness of 0.5 mm or less. In step g, the workpiece is cut by gently knocking with a hammer, and the workpiece is held by hand during cutting.

9. The method according to any one of claims 1 to 7, wherein the ring-shaped thin-walled member is a ring-shaped thin-walled member having a thickness of 0.5 mm or less. The air blowing holes are directed to the cutting position at the rear end of the workpiece, the cutting sleeve is reset and the air bag sleeve is deflated after the cutting sleeve is reset, and then the workpiece is taken off from the cutting sleeve.

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