A processing method for a ring-shaped thin-walled part connected body

Abstract

The application discloses a processing method of ring-shaped thin-wall piece connection, which comprises the following steps: S1, forging a blank; S2, rough turning one: three-jaw clamping outer circle, end face leaning flat, removing one end face and inner hole excess; S3, rough turning two: soft clamp supporting the inner hole and the end face processed in the step S2, removing the outer circle, the other end face of the connection, the inner hole and the inner hole excess of the middle connection part; S4, carburizing treatment: the whole semi-finished product is subjected to carburizing treatment, preparing for subsequent heat treatment; S5, first half-precision turning one: soft clamp supporting the inner hole and the end face of one end of the connection, turning off the other end face of the connection and the inner hole carburizing layer; and S6, first half-precision turning two: the processing method of the ring-shaped thin-wall piece connection can effectively control the deformation of the ring-shaped thin-wall piece in the processing process, guarantees the final size tolerance and position degree requirement of the part, and finally guarantees the quality of the product.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a method for machining a single ring-shaped thin-walled part. Background Technology

[0002] For thin-walled ring components such as sliding rings, after assembly with the flywheel flange, if wear occurs during actual use, only the sliding ring needs to be replaced. Therefore, the inner diameter of the sliding ring is relatively large and it needs to have good cylindricity to facilitate assembly with the flywheel flange. The outer circle of the sliding ring needs to be fitted with a sealing ring, which plays a sealing role after assembly. Therefore, the outer circle has good runout requirements for the inner hole, and the outer circle roughness requirements are high, requiring good wear resistance.

[0003] The existing technical requirements for sliding rings during machining are as follows: inner hole diameter φD, inner hole cylindricity requirement 0.04, outer diameter φd, outer circle runout relative to the inner hole requirement 0.02, outer circle surface roughness requirement Ra0.4, and outer circle carburized and hardened hardness of [missing information]. Carburized layer depth 500HV10=δmm, width L, wall thickness 3mm~4mm, see appendix for details. Figure 1 To meet the technical requirements of sliding rings, the parts need to be carburized and quenched, and the inner hole and outer circle need to be ground. Since sliding rings are large thin-walled parts (inner hole diameter ≥ φ145, wall thickness 3mm~4mm) and need to be heat treated, the dimensional tolerances and positional tolerances of the inner hole and outer circle are high, and deformation is easily generated during the processing. Therefore, it is particularly important to control and eliminate deformation.

[0004] Existing machining methods involve direct clamping with fixtures, which results in significant part deformation and fails to guarantee the final dimensions and positional tolerances of the sliding ring. Using internal hole positioning and pressure plate to press the end face only allows grinding of the outer diameter of the part, not the inner hole, thus failing to guarantee the cylindricity and tolerance requirements of the inner hole, as well as the runout requirements of the outer diameter relative to the inner hole. Using a head support for inner hole machining results in low material utilization. All of the above machining methods have defects and cannot meet the usage requirements of the sliding ring. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a processing method for an integral ring-shaped thin-walled part, which can effectively control the deformation of the ring-shaped thin-walled part during the processing, and ensure the final dimensional tolerance and positional accuracy requirements of the part, thus effectively solving the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for processing a ring-shaped thin-walled integral part, comprising the following steps:

[0007] S1: Forged blank;

[0008] S2: Rough turning 1: Three-jaw clamp the outer circle, flatten the end face, remove one end face and the inner hole allowance;

[0009] S3: Rough turning 2: Soft chuck support step S2. The inner hole and end face are flattened, and the outer circle, the other end face of the connecting body, the inner hole and the inner hole of the middle connecting part are removed.

[0010] S4: Carburizing treatment: Carburizing treatment is performed on the entire semi-finished product to prepare for subsequent heat treatment;

[0011] S5: First semi-finishing: The inner hole and end face of one end of the soft chuck support are flattened, and the carburized layer of the other end face and inner hole of the support is removed.

[0012] S6: First semi-finish turning 2: Using the inner hole and end face processed in step S5 as a reference, use soft chucks to support the inner hole, close to the flat end face, and machine off the other end face, inner hole and the carburized layer of the middle part of the connecting body.

[0013] S7: Stress-relieving tempering: Removes cutting stress generated during rough turning and the first semi-finish turning process, as well as stress generated during heat treatment.

[0014] S8: Second semi-finish turning 1: The inner hole and end face of one end of the soft chuck support are flattened. The end face, outer circle, outer groove, chamfer and the middle inner hole of the other end of the support are removed to ensure that the inner hole of the middle part of the support is a precision datum and has a good positional accuracy with the outer circle, which is convenient for subsequent finishing.

[0015] S9: Second semi-finish turning 2: The inner hole of the middle connecting part of the soft chuck support is aligned with the inner hole end face machined in step S8. The other end face, outer circle, outer groove and chamfer allowance of the connecting part are removed again.

[0016] S10: Quenching treatment: The semi-finished product is quenched as a whole and then finished to achieve the carburized layer depth δmm required by the design drawings.

[0017] S11: Precision machining one: The inner hole of the middle connecting part of the soft chuck support is flat against the end face of the inner hole of one end of the connecting part. The part of the other end of the connecting part is basically precision machined, leaving only the outer circle and inner hole grinding allowance, and the inner hole is grooved.

[0018] S12: Precision turning 2: The inner hole of the middle connecting part of the soft chuck support is aligned with the inner hole end face machined in step S11. The other end of the connecting part is basically precision turned into shape, leaving only the outer circle and inner hole grinding allowance, and the inner hole is grooved.

[0019] S13: Aging treatment: to remove stress generated during quenching, second semi-finish turning, and finish turning;

[0020] S14: Grinding 1: Grind the inner hole of the middle connecting part of the soft chuck support, and grind the outer circle and inner hole of the other end of the connecting part against the inner hole end face of one end of the connecting part in one clamping to ensure the final technical requirements of the inner hole and outer circle.

[0021] S15: Grinding the second part: The inner hole of the middle connecting part of the soft chuck support is aligned with the inner hole end face processed in step S14. The other end of the connecting part is clamped and ground at one time to ensure the final technical requirements of the inner hole and outer circle.

[0022] S16: Inspection;

[0023] S17: Cut open: Cut open the inner hole of the soft chuck support in the middle of the connecting part, close to the end face of the inner hole, and process it into two sliding ring parts.

[0024] S18: Surface grinding: The end face of the part is attracted by a magnetic chuck on a surface grinder, and the cutting surface is ground to ensure the final width dimensions of the two end faces of the part and their technical requirements.

[0025] S19: Overall deburring and cleaning;

[0026] S20: Final inspection;

[0027] S21: Rust prevention treatment, packaging, and warehousing.

[0028] In a preferred embodiment of the present invention, the depth of the carburized layer in step S4 is 500HV10 = δ1mm.

[0029] As a preferred embodiment of the present invention, in step S10, the hardness of the outer circle after carburizing and quenching is ensured to be [value missing]. The depth of the carburized layer is 500HV10 = δ2mm.

[0030] As a preferred embodiment of the present invention, the single-sided allowance of the groove in step S11 is 1 to 1.5 mm.

[0031] As a preferred embodiment of the present invention, the single-sided allowance of the groove in step S12 is 1 to 1.5 mm.

[0032] As a preferred embodiment of the present invention, in step S17, a 0.1mm allowance is reserved on the end face of the part at the cut point.

[0033] 1. Compared with the prior art, the beneficial effects of the present invention are: (1) The processing method of the ring-shaped thin-walled part is to reasonably arrange the process route, remove the allowance by turning multiple times, take the processed end of the part as the reference, process the other end of the part, arrange the fine turning process and aging treatment before fine grinding, minimize the grinding allowance and reduce the stress generated during the cutting process to the minimum, and reduce deformation; (2) The inner hole of the middle part is finely machined, and the inner hole of the middle part is used as the fine reference, supporting the inner hole and flattening the end face of the inner hole to avoid deformation of the clamped part. The middle part is clamped once to realize the grinding of the outer circle and inner hole of the part, ensuring the dimensional tolerance of the outer circle and inner hole, the cylindricity of the inner hole, the runout of the outer circle to the inner hole and other drawing technical requirements. Attached Figure Description

[0034] Figure 1 A simplified part diagram of a thin-walled ring-shaped sliding ring;

[0035] Figure 2 This is a process structure diagram of steps S2 and S3 of the present invention;

[0036] Figure 3 This is a process structure diagram of steps S5 and S6 of the present invention;

[0037] Figure 4 This is a process structure diagram of steps S8 and S9 of the present invention;

[0038] Figure 5 This is a process structure diagram of steps S11 and S12 of the present invention;

[0039] Figure 6 This is a process structure diagram of steps S14 and S15 of the present invention;

[0040] Figure 7 This is a process structure diagram of step S17 of the present invention;

[0041] Figure 8 This is a process structure diagram of step S18 of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] This invention provides a technical solution: a method for processing a ring-shaped thin-walled integral part, comprising the following steps:

[0044] S1: Forged blank;

[0045] S2: Rough turning 1 (rough turning end face, inner hole, chamfer): Clamp the outer diameter with a three-jaw chuck, flatten the end face, remove one end face and the remaining allowance from the inner hole. Leave a 1.6mm allowance in the outer diameter direction and a 17.9mm allowance in the inner hole diameter direction. See attached diagram. Figure 2 Left;

[0046] S3: Rough turning 2 (turning over to turn the end face, outer diameter, inner hole, and chamfer): The inner hole and end face machined in step S2 are flattened by the soft chuck support. The remaining material is removed from the outer diameter, the other end face of the connecting piece, the inner hole, and the inner hole of the middle connecting part. A 1.6mm allowance is reserved in the outer diameter direction, a 17.9mm allowance is reserved in the inner hole diameter direction, and a 10mm allowance is reserved in the inner hole diameter direction for the middle connecting part. (Refer to attached document) Figure 2 right;

[0047] S4: Carburizing treatment: Carburize the entire semi-finished product to ensure a carburized layer depth of 500HV10=δ1mm, in preparation for subsequent heat treatment.

[0048] S5: First Semi-finish Turning (First Semi-finish Turning of End Face, Inner Hole, and Chamfer): The inner hole and end face of one end of the soft chuck support assembly are flush. The carburized layer on the other end face and inner hole of the assembly is removed. A 7.9mm allowance is left in the inner hole diameter direction. (Refer to attached document) Figure 3 Left;

[0049] S6: First Semi-finish Turning II (Turning Around, First Semi-finish Turning of End Face, Inner Hole, and Chamfer): Using the inner hole and end face machined in step S5 as a reference, use soft chucks to support the inner hole, close to the flat end face, and machine off the other end face, inner hole, and the carburized layer of the middle connecting part. Leave a 7.9mm allowance in the inner hole diameter direction, and a 2mm allowance in the inner hole diameter direction for the middle connecting part. See attached... Figure 3 right;

[0050] S7: Stress-relieving tempering: Removes cutting stress generated during rough turning and the first semi-finish turning process, as well as stress generated during heat treatment.

[0051] S8: Second Semi-finish Turning (Second Semi-finish Turning of End Face, Outer Diameter, Inner Hole, Outer Groove, Chamfer): The inner hole and end face of one end of the soft chuck support assembly are flush. The remaining material on the other end face, outer diameter, outer groove, chamfer, and the middle inner hole of the assembly is removed. This ensures the middle inner hole of the assembly serves as a precision datum and has good positional accuracy with the outer diameter, facilitating subsequent finishing. A 1mm allowance is reserved in the outer diameter direction. See attached reference. Figure 4 Left;

[0052] S9: Second semi-finish turning (turning around and performing second semi-finish turning of the end face, outer diameter, outer groove, and chamfer): The inner hole of the middle connecting part of the soft chuck support is aligned with the inner hole end face machined in step S8. The remaining allowance for the other end face, outer diameter, outer groove, and chamfer is removed again. A 1mm allowance is reserved in both the outer diameter and inner hole diameter directions. (Refer to attached...) Figure 4 right;

[0053] S10: Quenching treatment: The semi-finished product undergoes overall quenching treatment to ensure that the outer diameter is carburized and hardened to a certain hardness. The carburized layer depth is 500HV10 = δ2mm, and after finishing, it meets the carburized layer depth requirement of δmm as designed in the drawings.

[0054] S11: Finish turning one (finish turning one end of the inner hole, inner groove, outer circle, and chamfer): The inner hole of the middle connecting part of the soft chuck support is flattened against the end face of the inner hole of one end of the connecting part. The part at the other end of the connecting part is basically finished, leaving only the outer circle and inner hole grinding allowance. The allowance in the diameter direction of the outer circle and the inner hole is 0.6mm. The inner hole is grooved, ensuring that the allowance on one side of the groove is 1~1.5mm, so as to facilitate the inner chamfering and release the cutting stress as much as possible at the groove. See attached document. Figure 5 Left;

[0055] S12: Finish turning two (turning around and finish turning one end of the inner hole, inner groove, outer circle, and chamfer): The inner hole of the middle connecting part of the soft chuck support is machined against the inner hole end face of step S11. The other end of the connecting part is basically finished turned, leaving only the outer circle and inner hole grinding allowance. The allowance in the diameter direction of the outer circle and inner hole is 0.6mm. The inner hole is grooved, ensuring that the single-sided allowance of the groove is 1~1.5mm, so as to facilitate the inner chamfering and release the cutting stress as much as possible at the groove. See attached... Figure 5 right;

[0056] S13: Aging treatment: to remove stress generated during quenching, second semi-finish turning, and finish turning;

[0057] S14: Grinding 1 (Grinding outer diameter and inner diameter): Using the soft chuck support, grind the inner diameter of the middle connecting part, close to the inner end face of one end of the connecting part. Grind the outer diameter and inner diameter of the other end of the connecting part in one clamping operation, ensuring the final technical requirements for both the inner and outer diameters are met. (Refer to the attached document.) Figure 6 Left;

[0058] S15: Grinding Part 2 (Grinding Outer Diameter and Inner Hole by Turning Around): Using a soft chuck to support the inner hole of the middle section of the assembly, and paralleling the inner hole end face machined in step S14, grind the outer diameter and inner hole of the other end of the assembly in one setup, ensuring the final technical requirements for both the inner and outer diameters are met. (See attached document for reference.) Figure 6 right;

[0059] S16: Inspection;

[0060] S17: Cutting: Cut along the inner hole of the soft chuck support's central connecting part, close to the flat end face of the inner hole, at the connecting part, to machine two sliding ring parts. Leave a 0.1mm allowance at the cut end face of the parts. See attached document. Figure 7 ;

[0061] S18: Surface Grinding: The end face of the part is held in place by a magnetic chuck on a surface grinder, and the cutting surface is ground to ensure the final width dimensions and technical requirements of both end faces of the part are met. (See attached document for reference.) Figure 8 ;

[0062] S19: Overall deburring and cleaning;

[0063] S20: Final inspection;

[0064] S21: Rust prevention treatment, packaging, and warehousing.

[0065] After machining the inner hole and end face of one end of the assembly in steps S2, S3, S5, S6, S8, and S9, use this as a reference to clamp the assembly and machine the inner hole, end face, and outer circle of the other end of the assembly. This ensures good consistency and positional accuracy at both ends of the assembly. During the turning process, the machining allowance is gradually removed, which effectively reduces deformation.

[0066] Steps S4 and S10 involve carburizing and quenching to achieve the design requirements for the hardness and carburized layer depth of the outer surface of the sliding ring.

[0067] Steps S7 and S13, through stress-relieving tempering and aging treatment, minimize the stress generated during cutting and heat treatment, effectively control deformation, and prepare for finishing on the grinding machine.

[0068] Steps S14, S15, S17, and S18 use the inner hole of the intermediate connecting part as the precision reference, support the inner hole of the intermediate connecting part, and flatten the end face of the inner hole at one end. The part is then clamped and precision machined and ground in one go, avoiding direct clamping of the part. During precision machining, grooves are cut on the outer circle and inner hole, ensuring a single-sided allowance of 1 to 1.5 mm for the groove. This allows the cutting stress to be released as much as possible at the groove, effectively controlling deformation and ensuring the design requirements of the sliding ring are well met.

[0069] In step S17, the inner hole of the connecting part is supported and the end face of the inner hole is flattened. The connecting part is cut to form two sliding ring parts. A 0.1mm allowance is reserved at the cut of the parts. In step S18, the cut surface is ground so that the width of the two end faces of the parts meets the design requirements.

[0070] This invention solves the problem of deformation of thin-walled ring-shaped parts by gradually removing machining allowances through integral machining, relieving stress through heat treatment, and performing fine machining on the inner hole of the integral part during clamping. While controlling the deformation of the parts, it ensures the tolerance of the outer circle dimensions, the runout of the outer circle relative to the inner hole, the outer circle roughness, the inner hole dimensional accuracy and cylindricity, thus guaranteeing the final product quality of the parts.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for machining a ring-shaped thin-walled part as a single unit, characterized in that: Includes the following steps: S1: Forged blank; S2: Rough turning 1: Three-jaw clamp the outer circle, flatten the end face, remove one end face and the inner hole allowance; S3: Rough turning 2: Soft chuck support step S2. The inner hole and end face are flattened, and the outer circle, the other end face of the connecting body, the inner hole and the inner hole of the middle connecting part are removed. S4: Carburizing treatment: Carburizing treatment is performed on the entire semi-finished product to prepare for subsequent heat treatment; S5: First semi-finishing: The inner hole and end face of one end of the soft chuck support are flattened, and the carburized layer of the other end face and inner hole of the support is removed. S6: First semi-finish turning 2: Using the inner hole and end face processed in step S5 as a reference, use soft chucks to support the inner hole, close to the flat end face, and machine off the other end face, inner hole and the carburized layer of the middle part of the connecting body. S7: Stress-relieving tempering: Removes cutting stress generated during rough turning and the first semi-finish turning process, as well as stress generated during heat treatment. S8: Second semi-finish turning 1: The inner hole and end face of one end of the soft chuck support are flattened. The end face, outer circle, outer groove, chamfer and the middle inner hole of the other end of the support are removed to ensure that the inner hole of the middle part of the support is a precision datum and has a good positional accuracy with the outer circle, which is convenient for subsequent finishing. S9: Second semi-finish turning 2: The inner hole of the middle connecting part of the soft chuck support is aligned with the inner hole end face machined in step S8. The other end face, outer circle, outer groove and chamfer allowance of the connecting part are removed again. S10: Quenching treatment: The semi-finished product is quenched as a whole and then finished to achieve the carburized layer depth δmm required by the design drawings. S11: Precision machining one: The inner hole of the middle connecting part of the soft chuck support is flat against the end face of the inner hole of one end of the connecting part. The part of the other end of the connecting part is basically precision machined, leaving only the outer circle and inner hole grinding allowance, and the inner hole is grooved. S12: Precision turning 2: The inner hole of the middle connecting part of the soft chuck support is aligned with the inner hole end face machined in step S11. The other end of the connecting part is basically precision turned into shape, leaving only the outer circle and inner hole grinding allowance, and the inner hole is grooved. S13: Aging treatment: to remove stress generated during quenching, second semi-finish turning, and finish turning; S14: Grinding 1: Grind the inner hole of the middle connecting part of the soft chuck support, and grind the outer circle and inner hole of the other end of the connecting part against the inner hole end face of one end of the connecting part in one clamping to ensure the final technical requirements of the inner hole and outer circle. S15: Grinding the second part: The inner hole of the middle connecting part of the soft chuck support is aligned with the inner hole end face processed in step S14. The other end of the connecting part is clamped and ground at one time to ensure the final technical requirements of the inner hole and outer circle. S16: Inspection; S17: Cut open: Cut open the inner hole of the soft chuck support in the middle of the connecting part, close to the end face of the inner hole, and process it into two sliding ring parts. S18: Surface grinding: The end face of the part is attracted by a magnetic chuck on a surface grinder, and the cutting surface is ground to ensure the final width dimensions of the two end faces of the part and their technical requirements. S19: Overall deburring and cleaning; S20: Final inspection; S21: Rust prevention treatment, packaging, and warehousing.

2. The processing method for a ring-shaped thin-walled integral part according to claim 1, characterized in that: In step S11, the allowance on one side of the groove is 1 to 1.5 mm.

3. The processing method for a ring-shaped thin-walled integral part according to claim 1, characterized in that: In step S12, the allowance on one side of the groove is 1 to 1.5 mm.

4. The processing method for a ring-shaped thin-walled integral part according to claim 1, characterized in that: In step S17, a 0.1mm allowance is reserved on the end face of the part at the cut point.

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