A machining method of a large-size high-precision thin-wall ring

Abstract

The application provides a machining method for a large-size high-precision thin-wall ring, comprising the following steps: pre-preparing a thin-wall ring blank; rough machining first and second end faces of the thin-wall ring blank; rough machining an outer circle and an inner hole of the thin-wall ring blank to obtain a thin-wall ring rough machining piece; semi-finish machining the outer circle and the inner hole of the thin-wall ring rough machining piece to obtain a thin-wall ring semi-finish machining piece; finish machining the outer circle, the inner hole and the second end face of the thin-wall ring to obtain a thin-wall ring finish machining piece; machining a tooling; and finish machining the first end face of the thin-wall ring to obtain a thin-wall ring target piece. The thin-wall ring machining method can avoid clamping deformation during machining of the part, and improve the yield of the part; meanwhile, the clamping is completely released after rough machining, semi-finish machining and end face finish machining, and the part is clamped again after returning to a free state, so that deformation generated during machining of the part can be removed in subsequent machining, and the final size precision is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical manufacturing, and particularly relates to a machining method of a large-size high-precision thin-wall ring. BACKGROUND

[0002] Large-size thin-wall ring sleeve parts are widely used in the field of mechanical equipment. The thin-wall ring structure is simple, but it is difficult to process because the outer diameter is greater than 700, the wall thickness is 10-15, the size tolerance and shape tolerance are high. Especially for stainless steel parts, clamping and metal cutting processing will cause deformation of the parts. The conventional processing method cannot meet the precision requirements of the parts, and the scrap rate of the parts is greatly increased. SUMMARY

[0003] Therefore, the technical problem to be solved by the application is to provide a machining method of a large-size high-precision thin-wall ring, which can avoid deformation of the thin-wall ring during processing and improve the yield of the thin-wall ring.

[0004] In order to solve the above problems, the application provides a machining method of a large-size high-precision thin-wall ring, comprising:

[0005] Step S1: preforming a thin-wall ring blank;

[0006] Step S2: rough machining first and second end faces of the thin-wall ring blank;

[0007] Step S3: rough machining an outer circle and an inner hole of the thin-wall ring blank to obtain a thin-wall ring rough turning piece;

[0008] Step S4: semi-finish machining the outer circle and the inner hole of the thin-wall ring rough turning piece to obtain a thin-wall ring semi-finished piece;

[0009] Step S5: finish machining the outer circle, the inner hole and the second end face of the thin-wall ring semi-finished piece to obtain a thin-wall ring finished piece;

[0010] Step S6: machining a tooling;

[0011] Step S7: finish machining the first end face of the thin-wall ring finished piece to obtain a thin-wall ring target piece.

[0012] Optionally, the outer diameter of the thin-wall ring target piece is D1, the inner diameter of the thin-wall ring target piece is D2, and the height of the thin-wall ring target piece is H;

[0013] The outer diameter of the thin-wall ring blank is D3, the inner diameter of the thin-wall ring blank is D4, and the height of the thin-wall ring blank is H1;

[0014] Wherein, D3-D1>12mm, D2-D4>12mm, H1-H>10mm.

[0015] Optionally, the rough machining of the first end face and the second end face of the thin-walled ring blank includes:

[0016] Step S201: clamping the thin-walled ring blank, and aligning the inner hole of the thin-walled ring blank;

[0017] Step S202: turning the first end face flat to form a reference surface A;

[0018] Step S203: turning over the thin-walled ring blank, clamping the thin-walled ring blank again, and aligning the inner hole of the thin-walled ring blank;

[0019] Step S204: turning the second end face flat to form a reference surface B;

[0020] Wherein, the parallelism of the reference surface A and the reference surface B is 0.015.

[0021] Optionally, the rough machining of the outer circle and the inner hole of the thin-walled ring blank includes:

[0022] Step S301: rough turning the outer circle of the thin-walled ring blank twice by pressing at least part of the second end face from the inside of the thin-walled ring blank through a pressing plate;

[0023] Step S302: respectively symmetrically loosen the inside pressing plate, and turn to outside pressing;

[0024] Step S303: rough turning the inner hole of the thin-walled ring blank twice by pressing at least part of the second end face from the outside of the thin-walled ring blank through the pressing plate;

[0025] Step S304: alternately and repeatedly execute steps S301 to S303 until the thin-walled ring rough turning piece is obtained;

[0026] Wherein, the single rough turning removal amount of the outer circle and the inner hole of the thin-walled ring blank is not more than 0.5mm;

[0027] Wherein, the rough turning height of the outer circle and the inner hole of the thin-walled ring blank is H2, H2-H=2mm;

[0028] Wherein, the outer diameter of the thin-walled ring rough turning piece is D5, D5-D1=2mm, and the inner diameter of the thin-walled ring rough turning piece is D6, D2-D6=2mm.

[0029] Optionally, the semi-finishing machining of the outer circle and the inner hole of the thin-walled ring rough turning piece includes:

[0030] Step S401: remove the pressing plate, re-clamp the thin-walled ring rough turning piece restored to a free state, and align the inner hole of the thin-walled ring rough turning piece;

[0031] Step S402: semi-finishing turning the outer circle of the thin-walled ring rough turning piece twice by the pressing plate pressing at least part of the second end face from the inner side of the thin-walled ring rough turning piece;

[0032] Step S403: respectively symmetrically loosening the inner side pressing plate and turning to outer side pressing;

[0033] Step S404: semi-finishing turning the inner hole of the thin-walled ring rough turning piece twice by the pressing plate pressing at least part of the second end face from the outer side of the thin-walled ring rough turning piece;

[0034] Step S405: alternately repeating steps S402 to S304 until the thin-walled ring semi-finished piece is obtained;

[0035] Wherein, the single semi-finishing removal amount of the outer circle and the inner hole of the thin-walled ring rough turning piece is not more than 0.05mm;

[0036] Wherein, the semi-finishing turning height of the outer circle and the inner hole of the thin-walled ring rough turning piece is H3, H3=H2;

[0037] Wherein, the outer diameter of the thin-walled ring semi-finished piece is D7, D7-D1=0.4mm, and the inner diameter of the thin-walled ring rough turning piece is D8, D2-D8=0.4mm;

[0038] Wherein, the thin-walled ring semi-finished piece has a reference surface C and a reference surface D, and the thickness of the reference surface C and the reference surface D is greater than 3mm.

[0039] Optionally, the semi-finishing the outer circle, the inner hole and the second end face of the thin-walled ring semi-finished piece comprises:

[0040] Step S501: removing the pressing plate, then symmetrically re-clamping the thin-walled ring semi-finished piece in free state on the reference surface C and the reference surface D and aligning the inner hole of the thin-walled ring semi-finished piece;

[0041] Step S502: finishing the second end face of the thin-walled ring semi-finished piece for several times;

[0042] Step S503: removing the pressing plate, re-clamping the thin-walled ring semi-finished piece in free state and aligning the inner hole of the thin-walled ring semi-finished piece;

[0043] Step S504: finishing the outer circle of the thin-walled ring semi-finished piece once by the pressing plate pressing at least part of the second end face from the inner side of the thin-walled ring semi-finished piece;

[0044] Step S505: respectively symmetrically loosening the inner side pressing plate and turning to outer side pressing;

[0045] Step S506: finish turning the inner hole of the thin-wall ring semi-finished part once by pressing at least part of the second end face of the thin-wall ring semi-finished part from the outside of the thin-wall ring semi-finished part through the pressing plate;

[0046] Step S507: alternately repeat steps S504 to S506 until the thin-wall ring finished part is obtained.

[0047] The single finish turning amount of the second end face of the thin-wall ring semi-finished part is 0.05 mm.

[0048] The single finish turning amount of the outer circle and the inner hole of the thin-wall ring semi-finished part is 0.02 mm.

[0049] The finish turning height of the outer circle and the inner hole of the thin-wall ring semi-finished part is H4, and H4-H>1 mm.

[0050] The outer diameter of the thin-wall ring finished part is D9, and D9=D1. The inner diameter of the thin-wall ring finished part is D10, and D10=D2.

[0051] Optionally, the machining tooling includes:

[0052] Step S601: machining the tooling positioning stopper to form a reference surface E and a reference surface F.

[0053] The parallelism of the reference surface E and the reference surface F is 0.015.

[0054] The outer diameter of the tooling is D11, and D1>D11. The diameter of the positioning stopper is D12, and D2-D12=0.02 mm.

[0055] The distance between the reference surface E and the reference surface F is H5, and H5≥5 mm.

[0056] Optionally, the finish turning the first end face of the thin-wall ring finished part includes:

[0057] Step S701: clamping the end of the thin-wall ring finished part close to the reference surface B through cooperation of the tooling and the clamping jaw.

[0058] Step S702: finish turning the first end face of the thin-wall ring finished part for several times to obtain the thin-wall ring target part.

[0059] Optionally, the height of the tooling is H6, and the height of the clamping jaw is H7, and H6>H7.

[0060] Optionally, the pressing plate is provided in plurality, and the plurality of pressing plates are uniformly arranged along the circumferential direction of the thin-wall ring.

[0061] Advantages

[0062] 1. The machining method of the large-size high-precision thin-wall ring provided by the application can realize the machining of the outer circle, the inner hole and the end face of the part in the state of pressing the end face of the part, thereby avoiding the clamping deformation of the part during machining and improving the yield of the part.

[0063] 2. The machining method of the large-size high-precision thin-wall ring provided by the application can realize the machining of the part by turning over only once, thereby avoiding the deformation caused by turning over of the part to the maximum extent.

[0064] 3. The machining method of the large-size high-precision thin-wall ring provided by the application releases the clamping after rough machining, semi-finishing machining and end face finishing machining, respectively, and re-clamps the part after the part is restored to a free state, thereby realizing the removal of the deformation of the part generated during machining in the subsequent machining.

[0065] 4. When the machining method provided by the application is used to machine the large-size high-precision thin-wall ring, the deformation of the part after finishing machining can be ensured to be within 0.02 mm.

[0066] 5. The machining method of the large-size high-precision thin-wall ring provided by the application is novel, simple to operate and easy to realize, and the precision and dimensional stability of the part after finishing machining are high. BRIEF DESCRIPTION OF DRAWINGS

[0067] Figure 1 It is a flow chart of the machining method of the large-size high-precision thin-wall ring of the embodiment of the application;

[0068] Figure 2 It is a structural schematic diagram of the thin-wall ring blank of the embodiment of the application;

[0069] Figure 3 It is a schematic diagram of machining of two end faces of the thin-wall ring blank of the embodiment of the application;

[0070] Figure 4 It is a structural schematic diagram of the rough turning part of the thin-wall ring of the embodiment of the application;

[0071] Figure 5 It is a structural schematic diagram of the semi-finishing machining part of the thin-wall ring of the embodiment of the application;

[0072] Figure 6 It is a structural schematic diagram of the finishing machining part of the thin-wall ring of the embodiment of the application;

[0073] Figure 7 It is a structural schematic diagram of the tooling of the embodiment of the application;

[0074] Figure 8Fig. 1 is a schematic view of a full-length operation for machining a thin-wall ring rough machining part of an embodiment of the present application;

[0075] Figure 9 Fig. 2 is a schematic view of a structure of a thin-wall ring target part of an embodiment of the present application;

[0076] Figure 10 Fig. 3 is a schematic view of a working of a pressing plate when machining an outer circle of a thin-wall ring of an embodiment of the present application;

[0077] Figure 11 Fig. 4 is a schematic view of a working of a pressing plate when machining an inner hole of a thin-wall ring of an embodiment of the present application;

[0078] Figure 12 Fig. 5 is a schematic view of a working of a pressing plate when machining a second end face of a thin-wall ring of an embodiment of the present application.

[0079] Reference signs are shown as follows:

[0080] 1, thin-wall ring blank; 2, thin-wall ring rough machining part; 3, thin-wall ring semi-finished machining part; 4, thin-wall ring finished machining part; 5, thin-wall ring target part; 6, tooling; 7, pressing plate; 8, clamping jaw; 9, reference surface A; 10, reference surface B; 11, reference surface C; 12, reference surface D; 13, reference surface E; 14, reference surface F. DETAILED DESCRIPTION

[0081] In the description of the present application, it needs to be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0082] In addition, the terms "first", "second", "third", etc. are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0083] In the present application, unless otherwise explicitly specified and limited, the terms "clamping", "fixing", and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0084] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0085] See also Figures 1 to 11 As shown, according to an embodiment of this application, a method for machining a large-size, high-precision thin-walled ring is provided, used to machine a thin-walled ring blank 1 into a thin-walled ring target part 5. The method for machining a large-size, high-precision thin-walled ring includes:

[0086] Step S1: Pre-fabricate the thin-walled ring blank 1 using conventional processes.

[0087] Among them, see Figure 9 As shown, the outer diameter of the thin-walled ring target part 5 is D1, the inner diameter of the thin-walled ring target part 5 is D2, and the height of the thin-walled ring target part 5 is H; see also Figure 2 As shown, the outer diameter of the thin-walled ring blank 1 is D3, the inner diameter of the thin-walled ring blank 1 is D4, and the height of the thin-walled ring blank 1 is H1.

[0088] Specifically, D3-D1>12mm, D2-D4>12mm, H1-H>10mm, to ensure that the subsequent roughing, semi-finishing and finishing tools of the thin-walled ring blank 1 have sufficient allowance.

[0089] Step S2: See Figure 3 As shown, the thin-walled ring blank 1 is placed on a vertical lathe and aligned. Then, the outer circle of the thin-walled ring blank 1 is clamped, and the first end face of the thin-walled ring blank 1 is machined to a flat surface. Then, the thin-walled ring blank 1 is flipped over, and aligned and clamped again. Then, the second end face of the thin-walled ring blank 1 is machined to a flat surface.

[0090] The two end faces machined in step S2 are used as reference surfaces for clamping the thin-walled ring blank 1 during roughing, semi-finishing, and finishing on a vertical lathe, so as to improve the accuracy of subsequent machining.

[0091] Specifically, the total length of the thin-walled ring blank 1 after machining both ends is 6mm-7mm longer than the total length of the thin-walled ring target part 5. This ensures sufficient total length allowance for subsequent machining and minimizes the amount of material removed from the end faces during step S7.

[0092] The first end face is turned to form datum surface A9, and the second end face is turned to form datum surface B10. The parallelism between datum surface A9 and datum surface B10 is 0.015 to improve the accuracy of subsequent machining.

[0093] Wherein, when the S2 operation is completed, the reference surface A9 is close to the lathe, that is, the first end surface of the thin-walled ring blank 1 is close to the lathe workbench. At this time, the second end surface of the thin-walled ring blank 1 is the end of the thin-walled ring blank 1 away from the lathe workbench, which is used for part clamping.

[0094] Wherein, the full length of the thin-walled ring blank 1 after machining the two end surfaces is 6mm-7mm larger than the full length of the thin-walled ring target piece 5, in order to ensure that the step S5 machining, the clamping reference surface C11 and reference surface D12 part of the pressure plate 7 has not less than 3mm thickness step.

[0095] Step S3: Rough machining the outer circle and inner hole of the thin-walled ring blank 1 to obtain a thin-walled ring rough machining piece 2.

[0096] Wherein, step S3 includes:

[0097] Step S301: Referring to Figure 10 The second end surface of the thin-walled ring blank 1 is pressed from the inside of the thin-walled ring blank 1 by the pressure plate 7, and then the outer circle of the thin-walled ring blank 1 is roughed twice.

[0098] Wherein, the single roughing amount of the outer circle of the thin-walled ring blank 1 is 0.5mm.

[0099] Wherein, the roughing height of the outer circle of the thin-walled ring blank 1 is H2, and H2-H=2mm.

[0100] Wherein, when the pressure plate 7 is located at the inside of the thin-walled ring blank 1 to press the second end surface, the outermost side of the pressure plate 7 cannot exceed the outer diameter D5 of the thin-walled ring rough machining piece 2.

[0101] Wherein, in order to avoid deformation of the thin-walled ring blank 1 during turning, the pressure plate 7 is provided with a plurality of pressure plates 7, and the plurality of pressure plates 7 are uniformly arranged along the circumferential direction of the thin-walled ring.

[0102] Specifically, the pressure plate 7 can be provided with eight, ten, twelve, fourteen or sixteen, etc., the number of pressure plates 7 is even, and the number of pressure plates 7 can be determined according to the size of the thin-walled ring, which is not limited in the present application.

[0103] Step S302: Symmetrical operation of the pressure plate 7.

[0104] Wherein, when the step S302 is completed, the plurality of pressure plates 7 are located at the radial outside of the rough thin-walled ring blank 1.

[0105] Specifically, by symmetrical pressure plate 7, the deformation of the thin-walled ring blank 1 due to stress release can be avoided, and the roughing accuracy of the inner hole of the thin-walled ring blank 1 is improved.

[0106] Step S303: Referring to Figure 11As shown, the second end face of the thin-walled ring blank 1 is pressed by several pressing plates 7 from the outside of the thin-walled ring blank 1, and then the inner hole of the thin-walled ring blank 1 is roughed twice.

[0107] The single roughing amount of the inner hole of the thin-walled ring blank 1 is 0.5mm.

[0108] The roughing height of the inner hole of the thin-walled ring blank 1 is H2, and H2-H=2mm.

[0109] As shown, when the second end face of the thin-walled ring roughing piece 2 is pressed from the inside of the thin-walled ring roughing piece 2 by the pressing plate 7, the innermost side of the pressing plate 7 cannot exceed the inner diameter D6 of the thin-walled ring roughing piece 2.

[0110] Step S304: repeatedly operating the above steps S301 to S303 until the thin-walled ring roughing piece 2 is obtained.

[0111] The operation process of step S3 is step S301, step S302, step S303, step S302, step S301, until the thin-walled ring roughing piece 2 is obtained.

[0112] As shown, Figure 4 As shown, the outer diameter of the thin-walled ring roughing piece 2 is D5, and the inner diameter of the thin-walled ring roughing piece 2 is D6.

[0113] Specifically, D5-D1=2mm, and D2-D6=2mm.

[0114] Step S4: semi-finishing the outer circle and inner hole of the thin-walled ring roughing piece 2 to obtain a thin-walled ring semi-finished piece 3.

[0115] Step S4 includes:

[0116] Step S401: loosen all the pressing plates 7 to make the thin-walled ring roughing piece 2 return to a free state and be clamped again, and the inner hole of the thin-walled ring roughing piece 2 is aligned.

[0117] After all the pressing plates 7 of the thin-walled ring roughing piece 2 are removed, the thin-walled ring roughing piece 2 can return to a free state, and then be clamped again for processing, so that the deformation of the thin-walled ring roughing piece 2 during processing can be removed in subsequent processing.

[0118] Step S402: as shown, Figure 10 As shown, the second end face of the thin-walled ring roughing piece 2 is pressed by several pressing plates 7 from the inside of the thin-walled ring roughing piece 2, and then the outer circle of the thin-walled ring roughing piece 2 is semi-finished twice.

[0119] The single roughing amount of the outer circle of the thin-walled ring roughing piece 2 is 0.05mm.

[0120] Among them, the semi-finishing turning height of the outer circle of the thin-walled ring rough-turned part 2 is H3, where H3-H=2mm.

[0121] When the pressure plate 7 is located inside the rough-machined thin-walled ring 2 and presses against the second end face, the outermost part of the pressure plate 7 cannot exceed the outer diameter D7 of the semi-finished thin-walled ring 3.

[0122] Step S403: The pressure plate 7 is reversed symmetrically.

[0123] In this step, S403 is the same as step S302. When step S402 is completed, several pressure plates 7 are located on the radial outer side of the thin-walled ring rough-machined part 2.

[0124] Specifically, the symmetrical pressure plate 7 can prevent the deformation of the thin-walled ring rough-machined part 2 due to stress release, thereby improving the semi-finishing accuracy of the inner hole of the subsequent thin-walled ring rough-machined part 2.

[0125] Step S404: See Figure 11 As shown, at least part of the second end face of the thin-walled ring rough-turned part 2 is pressed from the outside by several pressure plates 7, and then the inner hole of the thin-walled ring rough-turned part 2 is semi-finished and turned twice.

[0126] Among them, the amount of material removed in a single roughing process of the inner hole of the thin-walled ring roughing part 2 does not exceed 0.05 mm.

[0127] Among them, the roughing height of the inner hole of the thin-walled ring rough-machined part 2 is H3, where H3-H=2mm.

[0128] When the pressure plate 7 is located on the outside of the rough-machined thin-walled ring 2 and presses against the second end face, the innermost side of the pressure plate 7 cannot exceed the inner diameter D8 of the semi-finished thin-walled ring 3.

[0129] Step S405: Repeat steps S402 to S404 alternately until the thin-walled ring semi-finished part 3 is obtained.

[0130] The operation process of step S4 is as follows: step S402, step S403, step S404, step S403, step S402, until the thin-walled ring semi-finished part 3 is obtained.

[0131] Among them, see Figure 5 As shown, the outer diameter of the thin-walled ring semi-finished part 3 is D7, and the inner diameter of the thin-walled ring semi-finished part 3 is D8.

[0132] Specifically, D7-D1 = 0.4mm, D2-D8 = 0.4mm.

[0133] Among them, the thin-walled ring semi-finished part 3 has a reference surface C11 and a reference surface D12. The thickness at the reference surface C11 and the reference surface D12 is greater than 3mm, which provides a stable clamping position for the precision machining of the second end face.

[0134] Step S5: Finish the outer circle, inner hole and second end face of the thin-walled ring semi-finished part 3 to obtain the thin-walled ring finished part 4.

[0135] Step S5 includes:

[0136] Step S501: Loosen all the pressure plates 7 to restore the thin-walled ring semi-finished part 3 to a free state and re-clamp it, while aligning the inner hole of the thin-walled ring semi-finished part 3.

[0137] In this process, after all the pressure plates 7 of the thin-walled ring semi-finished part 3 are removed, the thin-walled ring semi-finished part 3 can be restored to a free state and then re-mounted for processing. This allows the deformation generated during the processing of the thin-walled ring semi-finished part 3 to be removed in subsequent processing.

[0138] Step S502: Perform precision machining on the second end face of the thin-walled ring semi-finished part 3 several times until the second end face is flat.

[0139] During the finishing of the second end face, the pressure plate 7 is pressed tightly against... Figure 5 The clamping method of pressure plate 7 at the reference surfaces C11 and D12 is shown in the figure. Figure 12 .

[0140] Among them, the amount of material removed from the second end face of the thin-walled ring semi-finished part 3 in a single precision machining operation does not exceed 0.05 mm.

[0141] Step S503: Loosen all pressure plates 7 to restore the thin-walled ring semi-finished part 3 to a free state and re-clamp it, while aligning the inner hole of the thin-walled ring semi-finished part 3.

[0142] In this process, after all the pressure plates 7 of the thin-walled ring semi-finished part 3 are removed, the thin-walled ring semi-finished part 3 can be restored to a free state and then re-mounted for processing. This allows the deformation generated during the processing of the thin-walled ring semi-finished part 3 to be removed in subsequent processing.

[0143] Step S504: See Figure 10 As shown, at least part of the second end face of the thin-walled ring semi-finished part 3 is pressed from the inside by several pressure plates 7, and then the outer circle of the thin-walled ring semi-finished part 3 is precision machined once.

[0144] Among them, the amount of material removed by a single precision turning of the outer circle of the thin-walled ring semi-finished part 3 does not exceed 0.02mm.

[0145] Among them, the semi-finishing turning height of the thin-walled ring semi-finished part 3 is H4, where H4-H>1mm.

[0146] Wherein, when the pressing plate 7 presses the second end face of the thin-walled ring semi-finished part 3 from the inside, the outermost side of the pressing plate 7 cannot exceed the outer diameter D9 of the thin-walled ring finished part 4.

[0147] Step S505: Symmetrical operation of the pressing plate 7.

[0148] Wherein, the step S505 is the same as the step S403 and the step S302, and when the step S505 is completed, the several pressing plates 7 are located at the radial outside of the thin-walled ring semi-finished part 3.

[0149] Specifically, by symmetrical operation of the pressing plate 7, the deformation of the thin-walled ring semi-finished part 3 due to stress release can be avoided, and the subsequent fine turning accuracy of the inner hole of the thin-walled ring semi-finished part 3 is improved.

[0150] Step S506: Referring to Figure 11 the second end face of the thin-walled ring semi-finished part 3 is pressed by the several pressing plates 7 from the outside, and then the inner hole of the thin-walled ring semi-finished part 3 is fine turned once.

[0151] Wherein, the single fine turning removal amount of the inner hole of the thin-walled ring semi-finished part 3 is not more than 0.02mm.

[0152] Wherein, the fine turning height of the inner hole of the thin-walled ring semi-finished part 3 is H4, and H4-H>1mm.

[0153] Wherein, when the pressing plate 7 presses the second end face of the thin-walled ring semi-finished part 3 from the outside, the innermost side of the pressing plate 7 cannot exceed the inner diameter D10 of the thin-walled ring finished part 4.

[0154] Step S507: Interchangeable repeated operation of the above steps S504 to S506 until the thin-walled ring finished part 4 is obtained.

[0155] Wherein, the operation process of the step S5 is the step S504, the step S505, the step S506, the step S505, and the step S504 until the thin-walled ring finished part 4 is obtained.

[0156] Wherein, referring to Figure 6 the outer diameter of the thin-walled ring finished part 4 is D9, and the inner diameter of the thin-walled ring finished part 4 is D10.

[0157] Specifically, D9=D1, and D10=D2.

[0158] Step S6: Machining tooling 6.

[0159] Wherein, the step S6 includes:

[0160] Step S601: Referring to Figure 7As shown, on the basis of step S5, the positioning stop of the machining tool 6 is positioned at the actual measured size of the inner hole D10 of the thin-wall ring precision machined part 4, which is -0.02 mm, to ensure that the machining tool 6 and the thin-wall ring precision machined part 4 can play a role in improving the clamping rigidity of the thin-wall ring precision machined part 4 after being clamped.

[0161] The bottom surface of the positioning stop is the reference surface E13, and the bottom surface of the machining tool 6 is the reference surface F14.

[0162] The axis of the positioning stop is perpendicular to the reference surface F14.

[0163] Specifically, the parallelism between the reference surface E13 and the reference surface F14 is 0.015.

[0164] As shown in Figure 7 As shown, the outer diameter of the machining tool 6 is D11, and the diameter of the positioning stop is D12.

[0165] Specifically, D1>D11, and D2-D12=0.02 mm.

[0166] As shown in Figure 7 As shown, the distance between the reference surface E13 and the reference surface F14 is H5.

[0167] Specifically, H5≥5 mm, which does not affect the clamping of the thin-wall ring precision machined part 4 by the clamping jaw.

[0168] Step S7: machining the first end surface of the thin-wall ring precision machined part 4 to obtain the thin-wall ring target part 5.

[0169] Specifically, step S7 includes:

[0170] Step S701: as shown in Figure 8 As shown, the thin-wall ring precision machined part 4 is clamped near the second end surface by the cooperation of the machining tool 6 and the clamping jaw 8.

[0171] Specifically, the inner circle of the thin-wall ring precision machined part 4 is placed on the positioning stop of the machining tool 6.

[0172] Specifically, the second end surface of the thin-wall ring precision machined part 4 is arranged on the reference surface E13 of the machining tool 6, and the two surfaces are in close contact. The clamping jaw 8 clamps the outer circle of the thin-wall ring precision machined part 4.

[0173] Specifically, the height of the machining tool 6 is H6, and the height of the clamping jaw 8 is H7.

[0174] Specifically, as shown in Figure 8 As shown, H6>H7, so that the cooperation of the clamping jaw 8 and the machining tool 6 can clamp the thin-wall ring precision machined part 4.

[0175] Specifically, the first end face position of the thin-walled ring finishing part 4 is higher than the upper end face of the clamping jaw and the tool 6, which does not affect the machining operation of the thin-walled ring finishing part 4. It can be understood that the sizes of H5 and H6 can be adjusted according to the size of H7, and the present application does not make further limitation.

[0176] Step S702: finish machining the first end face of the thin-walled ring finishing part 4 for several times until the thin-walled ring target part 5 is obtained.

[0177] Wherein, the single finish machining removal amount of the first end face of the thin-walled ring finishing part 4 is not more than 0.02mm.

[0178] Beneficial effects

[0179] 1. The machining method of the large-size high-precision thin-walled ring provided by the application can realize the machining of the outer circle, the hole and the end face of the part in the state of pressing the end face of the part, thereby avoiding the clamping deformation of the part during machining and improving the yield of the part.

[0180] 2. The machining method of the large-size high-precision thin-walled ring provided by the application can realize the machining of the part by turning over only once, thereby avoiding the deformation caused by turning over the part to the greatest extent.

[0181] 3. The machining method of the large-size high-precision thin-walled ring provided by the application releases all clamping after rough machining, semi-finish machining and end face finish machining, and makes the part return to a free state and then clamps and processes again, thereby realizing the removal of the deformation of the part generated during machining in the subsequent machining.

[0182] 4. The machining method of the large-size high-precision thin-walled ring provided by the application can ensure that the deformation of the part is within 0.02mm after finish machining when machining the large-size high-precision thin-walled ring part.

[0183] 5. The machining method of the large-size high-precision thin-walled ring provided by the application is novel, simple to operate and easy to realize, and has high precision and dimensional stability after finish machining of the part.

[0184] Those skilled in the art can understand that the above advantageous modes can be freely combined and superimposed without conflict.

[0185] The above is only a preferred embodiment of the application and does not limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application. The above is only a preferred embodiment of the application, and it should be pointed out that those skilled in the art can make several improvements and modifications without departing from the technical principles of the application, and these improvements and modifications shall be regarded as the protection scope of the application.

Claims

1. A method for machining large-size, high-precision thin-walled rings, characterized in that, include: Step S1: Pre-fabricate thin-walled ring blank (1); Step S2: Roughly machine the first and second end faces of the thin-walled ring blank (1); Step S3: Roughly machine the outer circle and inner hole of the thin-walled ring blank (1) to obtain the thin-walled ring rough machined part (2); Step S4: Semi-finish machining the outer circle and inner hole of the rough-machined thin-walled ring (2) to obtain the semi-finished thin-walled ring (3); Step S5: Finish the outer circle, inner hole and second end face of the thin-walled ring semi-finished part (3) to obtain the thin-walled ring finished part (4); Step S6: Machining tooling (6); Step S7: Finish the first end face of the thin-walled ring finishing part (4) to obtain the thin-walled ring target part (5); The rough machining of the outer circle and inner hole of the thin-walled annular blank (1) includes: Step S301: Press at least part of the second end face from the inside of the thin-walled ring blank (1) with a pressure plate (7), and rough turn the outer circle of the thin-walled ring blank (1) twice; Step S302: Loosen the inner pressure plate (7) symmetrically and tighten the outer pressure plate; Step S303: Press at least part of the second end face from the outside of the thin-walled ring blank (1) by the pressure plate (7), and rough machine the inner hole of the thin-walled ring blank (1) twice; Step S304: Repeat steps S301 to S303 alternately until the thin-walled ring rough-machined part (2) is obtained. The amount of material removed during a single roughing process of the outer circle and inner hole of the thin-walled ring blank (1) does not exceed 0.5 mm. The roughing height of the outer circle and inner hole of the thin-walled ring blank (1) is H2, where H2-H=2mm; The outer diameter of the thin-walled ring rough-machined part (2) is D5, D5-D1=2mm, and the inner diameter of the thin-walled ring rough-machined part (2) is D6, D2-D6=2mm. The semi-finishing of the outer circle and inner hole of the thin-walled ring rough-machined part (2) includes: Step S401: Remove the pressure plate (7), reinstall the thin-walled ring rough-machined part (2) to restore it to a free state, and align the inner hole of the thin-walled ring rough-machined part (2); Step S402: Press at least part of the second end face from the inside of the thin-walled ring rough-turned part (2) by the pressure plate (7), and semi-finish turn the outer circle of the thin-walled ring blank (1) twice; Step S403: Loosen the inner pressure plate (7) symmetrically and tighten the outer pressure plate; Step S404: Press at least part of the second end face from the outside of the thin-walled ring rough-turned part (2) by the pressure plate (7), and semi-finish turn the inner hole of the thin-walled ring blank (1) twice; Step S405: Repeat steps S402 to S404 alternately until the thin-walled ring semi-finished part (3) is obtained. The amount of material removed in a single semi-finishing process for the outer circle and inner hole of the thin-walled ring rough-machined part (2) does not exceed 0.05 mm. The semi-finishing turning height of the outer circle and inner hole of the thin-walled ring rough-turned part (2) is H3, where H3 = H2; The outer diameter of the thin-walled ring semi-finished part (3) is D7, D7-D1=0.4mm, and the inner diameter of the thin-walled ring rough-machined part (2) is D8, D2-D8=0.4mm. The thin-walled ring semi-finished part (3) has a reference surface C (11) and a reference surface D (12), and the thickness of the reference surface C (11) and the reference surface D (12) is greater than 3 mm.

2. The processing method for large-size, high-precision thin-walled rings according to claim 1, characterized in that, The outer diameter of the thin-walled ring target (5) is D1, the inner diameter of the thin-walled ring target (5) is D2, and the height of the thin-walled ring target (5) is H; The outer diameter of the thin-walled ring blank (1) is D3, the inner diameter of the thin-walled ring blank (1) is D4, and the height of the thin-walled ring blank (1) is H1. Among them, D3-D1>12mm, D2-D4>12mm, H1-H>10mm.

3. The processing method for large-size, high-precision thin-walled rings according to claim 2, characterized in that, The rough machining of the first and second end faces of the thin-walled annular blank (1) includes: Step S201: Mount the thin-walled ring blank (1) and align the inner hole of the thin-walled ring blank (1); Step S202: Turn the first end face to flatten it to form the reference surface A (9); Step S203: Flip the thin-walled ring blank (1), re-mount the thin-walled ring blank (1), and align the inner hole of the thin-walled ring blank (1); Step S204: Turn the second end face to flatten it to form the reference surface B (10). The parallelism between the reference plane A (9) and the reference plane B (10) is 0.

015.

4. The processing method for large-size, high-precision thin-walled rings according to claim 1, characterized in that, The finishing of the outer circle, inner hole, and second end face of the thin-walled annular semi-finished part (3) includes: Step S501: Remove the pressure plate (7), and then symmetrically re-mount the thin-walled ring semi-finished part (3) restored to its free state on the reference surface C (11) and the reference surface D (12), and align the inner hole of the thin-walled ring semi-finished part (3); Step S502: Perform precision machining on the second end face of the thin-walled ring semi-finished part (3) several times; Step S503: Remove the pressure plate (7), reinstall the thin-walled ring semi-finished part (3) restored to its free state, and align the inner hole of the thin-walled ring semi-finished part (3); Step S504: Press at least part of the second end face from the inside of the thin-walled ring semi-finished part (3) by the pressure plate (7), and finish turn the outer circle of the thin-walled ring semi-finished part (3) once; Step S505: Loosen the inner pressure plate (7) symmetrically and tighten the outer pressure plate; Step S506: Press at least part of the second end face from the outside of the thin-walled ring semi-finished part (3) by the pressure plate (7), and finish turn the inner hole of the thin-walled ring semi-finished part (3) once; Step S507: Repeat steps S504 to S506 alternately until the thin-walled ring finished part (4) is obtained. The single precision machining amount of the second end face of the thin-walled ring semi-finished part (3) is 0.05 mm; The single precision machining amount of the outer circle and inner hole of the thin-walled ring semi-finished part (3) is 0.02 mm; Among them, the finishing height of the outer circle and inner hole of the thin-walled ring semi-finished part (3) is H4, H4-H>1mm; The outer diameter of the thin-walled ring precision-machined part (4) is D9, D9=D1, and the inner diameter of the thin-walled ring precision-machined part (4) is D10, D10=D2.

5. The processing method for large-size, high-precision thin-walled rings according to claim 4, characterized in that, The machining fixture (6) includes: Step S601: Machining the positioning stop of the tooling (6) to form the reference surface E (13) and the reference surface F (14). Wherein, the parallelism between the reference plane E (13) and the reference plane F (14) is 0.015; Wherein, the outer diameter of the tooling (6) is D11, D1>D11, and the diameter of the positioning stop is D12, D2-D12=0.02mm; The distance between the reference plane E (13) and the reference plane F (14) is H5, where H5 ≥ 5 mm.

6. The processing method for large-size, high-precision thin-walled rings according to claim 5, characterized in that, The finishing of the first end face of the thin-walled ring finishing part (4) includes: Step S701: The tooling (6) and the jaws (8) are used to clamp the thin-walled ring precision-machined part (4) at one end near the reference surface B (10); Step S702: The first end face of the thin-walled ring precision-machined part (4) is precision-machined several times to obtain the thin-walled ring target part (5).

7. The processing method for large-size, high-precision thin-walled rings according to claim 6, characterized in that, The height of the tooling (6) is H6, and the height of the gripper (8) is H7, where H6 > H7.

8. The processing method for large-size, high-precision thin-walled rings according to claim 7, characterized in that, Several pressure plates (7) are provided, and the several pressure plates (7) are evenly arranged along the circumferential direction of the thin-walled ring.

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