A processing method for long thin-walled cylindrical parts

Abstract

The application belongs to the field of mechanical processing and provides a processing method for a thin-wall long-cylinder part. The application designs a more mature process flow route, controls part deformation, adopts a method of processing an outer circle first and then processing an inner circle, reduces the problem of excessive deformation of the thin-wall long-cylinder part during inner and outer circle processing, reduces the clamping frequency, shortens the processing time, improves the efficiency, guarantees the product quality, and effectively solves the problem of part deformation during processing by additionally installing an outer circle hoop and an inner support tool.

Description

Technical Field

[0001] This invention belongs to the field of machining, and in particular relates to a machining method for thin-walled long cylindrical parts. Background Technology

[0002] Thin-walled cylindrical parts are now widely used in people's production and daily life. The existing processing technology for thin-walled cylindrical parts is relatively mature, but there are still some problems in actual production.

[0003] When the length of a thin-walled cylindrical part is long, due to the thin wall thickness, the part will be affected by cutting force, clamping force, cutting temperature, its own deflection and stress release during the machining of the inner and outer circles. This will affect the dimensional accuracy and form and position tolerance of the part. When the length of the part reaches a certain number, it will lead to excessive deformation of the part, which will seriously restrict the development of thin-walled long cylindrical parts.

[0004] Therefore, developing a machining method for thin-walled long cylindrical parts to solve the problem of excessive deformation during the machining of inner and outer diameters of thin-walled long cylindrical parts is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This invention provides a method for processing thin-walled long cylindrical parts, aiming to solve the problem of excessive deformation during the machining of inner and outer diameters of thin-walled long cylindrical parts.

[0006] This invention is implemented as follows: a method for processing thin-walled long cylindrical parts, the method comprising the following steps in sequence:

[0007] Step S1: Divide the finished part into several single cylindrical sections according to the size of the finished part, and then cut the material into sections.

[0008] Step S2: After unloading, use a three-roll plate rolling machine to roll the single section of the cylinder into a circle, and spot weld the joint to reinforce it.

[0009] Step S3: Weld the longitudinal seam of the single section of the cylinder using submerged arc welding, and then round the cylinder section after welding;

[0010] Step S4: After standing for S1 time, perform radiographic testing on the longitudinal seam of the single cylinder section and repair any defective local welds.

[0011] Step S5: Install an inner support ring plate inside the single cylindrical section to prevent the single cylindrical section from deforming into an ellipse during storage;

[0012] Step S6: Weld several single cylindrical sections into a whole part, and weld flanges at both ends of the whole part. After welding, perform radiographic testing on the whole part.

[0013] Step S7: Anneal the entire part to relieve stress;

[0014] Step S8, installing process plugs at both end flanges;

[0015] Step S9, rough machining of the outer circle of the integral part;

[0016] Step S10, standing for S2 time;

[0017] Step S11, finish machining of the outer circle of the integral part;

[0018] Step S12, installing several outer circle reinforcing clamps on the outer circle of the integral part for preventing oval deformation of the integral part after machining;

[0019] Step S13, rough machining of the inner diameter of the integral part;

[0020] Step S14, standing for S3 time;

[0021] Step S15, semi-finish machining of the inner diameter of the integral part;

[0022] Step S16, standing for S4 time;

[0023] Step S17, finish machining of the inner diameter of the integral part;

[0024] Step S18, machining of the outer circle and end face of the flanges at both ends of the integral part;

[0025] Step S19, installing inner support tooling in the inner hole of the integral part for preventing deformation of the integral part during storage.

[0026] Optionally, the S1 time is 30-50 hours.

[0027] Optionally, the S2 time is 40-50 hours.

[0028] Optionally, the S3 time is 40-50 hours.

[0029] Optionally, the method of machining the end face and the bevel after rolling the single-section cylinder section is adopted at the step S6.

[0030] Optionally, the clamps are connected by bolts and nuts.

[0031] The beneficial technical effects of implementing the present application are that the more mature process flow route is designed by using the technical solution of the present application, the deformation of the part is controlled, the method of machining the outer circle first and then machining the inner circle is adopted, the problem of excessive deformation of the thin-walled long-cylinder type part during the machining of the inner and outer circles is reduced, the clamping times are reduced, the machining time is shortened, the efficiency is improved, the product quality is ensured, and the deformation problem of the part during the machining process is effectively solved by installing the outer circle clamps and the inner support tooling. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the processing flow of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "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 do not indicate or imply 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 application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "a plurality of" means two or more, and "several" means one or more.

[0035] The present application will be described in detail below with reference to the drawings and in combination with examples.

[0036] A processing method of a thin-walled long cylindrical part, the processing method sequentially comprises the following steps:

[0037] Step S1, according to the size of the finished part, the part is divided into several single-section cylinders, and then the part is segmented and cut;

[0038] Step S2, after cutting, the single-section cylinder is coiled by a three-roll plate coiling machine, and the butt joint position is spot welded and reinforced;

[0039] Step S3, the longitudinal seam of the single-section cylinder is welded by submerged arc welding, and the cylinder section is corrected after welding;

[0040] Step S4, after standing for S1 time, the longitudinal seam of the single-section cylinder is radiographically inspected, and the defective local weld is repaired;

[0041] Step S5, an inner supporting ring plate is installed inside the single-section cylinder for preventing the single-section cylinder from being deformed into an ellipse during storage;

[0042] Step S6, several single-section cylinder sections are welded into an integral part, and flanges are welded at both ends of the integral part, and after welding, the integral part is subjected to radiographic inspection;

[0043] Step S7, the integral part is subjected to annealing stress relief;

[0044] Step S8, process plugs are installed at the flanges at both ends;

[0045] Step S9, rough machining is performed on the outer circle of the integral part;

[0046] Step S10, standing for S2 time;

[0047] Step S11, finish machining is performed on the outer circle of the integral part;

[0048] Step S12, several outer circle reinforcing clamps are installed on the outer circle of the integral part to prevent oval deformation of the integral part after machining;

[0049] Step S13, rough machining is performed on the inner diameter of the integral part;

[0050] Step S14, standing for S3 time;

[0051] Step S15, semi-finish machining is performed on the inner diameter of the integral part;

[0052] Step S16, standing for S4 time;

[0053] Step S17, finish machining is performed on the inner diameter of the integral part;

[0054] Step S18, the outer circle and end face of the flanges at both ends of the integral part are machined;

[0055] Step S19, an inner support tool is installed in the inner hole of the integral part to prevent deformation of the integral part during storage

[0056] In this embodiment, S1 time is 30-50 hours.

[0057] The advantage of this embodiment is that internal stress of the part is released by standing.

[0058] In this embodiment, S2 time is 40-50 hours.

[0059] The advantage of this embodiment is that internal stress of the part is released by standing.

[0060] In this embodiment, S3 time is 40-50 hours.

[0061] The advantage of this embodiment is that internal stress of the part is released by standing.

[0062] In this embodiment, the method of machining the end face and the bevel after coiling the single-section cylinder section is adopted at step S6.

[0063] The embodiment has the advantage that the assembling and welding precision of the cylinder section is ensured.

[0064] In the embodiment, the hoop is connected by bolts and nuts.

[0065] The embodiment has the advantage that the bolt and nut connection is stable and convenient to disassemble.

[0066] In order to prove that the processing method proposed in the application can objectively and accurately process the thin-walled long cylinder parts, the following embodiment is made.

[0067] Embodiment one

[0068] Background: The existing thin-walled long cylinder part has a total length of 12000mm, a maximum outer diameter of 2446mm, a minimum inner diameter of 2388mm, and a minimum wall thickness of only 16mm.

[0069] According to step S1, the single-section cylinder section is divided according to the size of the finished part, and then the segmented blanking is performed; the total length is 12000mm, which is divided into 6 sections, each section being 2000mm long.

[0070] According to step S2, after blanking, the single-section cylinder section is coiled by a three-roller plate coiling machine, and the butt joint position is spot welded and reinforced; when the rolling is completed, the butt joint is checked, and the edge deviation is less than 2mm, the corner angle is less than 2mm, and the end face butt joint amount is less than 1mm, and then spot welding and reinforcement are performed.

[0071] According to step S3, the single-section cylinder section longitudinal seam is welded by using the submerged arc welding method, and the cylinder section is corrected after welding; the roundness tolerance is controlled to 1.5mm, and the cylindrical tolerance is controlled to 2.5mm.

[0072] According to step S4, after the single-section cylinder section longitudinal seam is radiographically inspected after standing for S1 time, the defective local weld is repaired; the standing time is 48 hours.

[0073] According to step S5, an inner supporting ring plate is installed inside the single-section cylinder section, which is used to prevent the single-section cylinder section from being deformed in the storage process.

[0074] According to step S6, the single-section cylinder sections are welded into an integral part, and flanges are welded at both ends of the integral part, and the integral part is radiographically inspected after welding; the method of machining the end face and the bevel after the single-section cylinder section is coiled is used to ensure the assembling and welding precision of the cylinder section.

[0075] According to step S7, annealing stress relief is performed on the integral part; the integral part is put into the furnace at room temperature, the heating zone is heated at a speed of 60-80°C / h after being heated to 300°C, and the integral part is kept at 550°C±10°C for 4h; the integral part is cooled at a speed of 80-100°C / h at the heating zone above 300°C, and the workpiece is taken out of the furnace when it is cooled to room temperature, and is cooled in static air after being taken out of the furnace; in order to prevent the integral part from being deformed during the heat treatment, the inner supporting ring plate is not removed before annealing.

[0076] According to step S8, process plugs are installed at the flanges at both ends; and preparation is made for machining the outer circle.

[0077] According to step S9, rough machining is performed on the outer circle of the integral part; the outer circle of the integral part is machined by using a horizontal lathe, the integral part is clamped and aligned by using the inner supporting ring plate in the middle, deflection deformation caused by the long workpiece is prevented, the rotating speed is controlled at about 15r / min, the feed amount is 0.3mm / r, and the cutting depth is controlled at 2-3mm.

[0078] According to step S10, the integral part is left for S2 time; the left time is 48h.

[0079] According to step S11, finish machining is performed on the outer circle of the integral part; the clamping and supporting mode is the same as that in step S9, and after the outer circle is machined, the straightness of the outer circle of the inner cylinder is checked by using a feed rest, and the roundness of the outer circle is checked by using an outer diameter micrometer.

[0080] According to step S12, several outer circle reinforcing clamps are installed on the outer circle of the integral part, which are used to prevent oval deformation of the integral part after machining.

[0081] According to step S13, rough machining is performed on the inner diameter of the integral part; the inner diameter of the integral part is rough bored by using a special combined machine tool, the inner circle of the inner hole of each gear is machined, and the single side allowance is 1.5-2mm; the rotating speed is 20r / min, the feed amount is 0.2mm / r, and the cutting amount is 2-3mm during machining.

[0082] According to step S14, the integral part is left for S3 time; the left time is 48h.

[0083] According to step S15, semi-finish machining is performed on the inner diameter of the integral part; the clamping mode is the same as that in step S13, 1mm allowance is left on the inner diameter and the groove, and the radial feed is automatically fed during machining of the groove.

[0084] According to step S16, the integral part is left for S4 time; the left time is 48h.

[0085] According to step S17, the inner diameter of the integral part is finished; the moving cutter bar is used for machining, and the machining length is not more than 450mm each time, which is used for overcoming the deflection of the cutter bar and ensuring the coaxiality of the inner hole. The rotating speed is 20r / min, the feed amount is 0.2mm / r, and the cutting amount is 0.5mm.

[0086] According to step S18, the outer circle and end face of the flange at two ends of the integral part are machined; the numerical control boring and milling machine is used for machining.

[0087] According to step S19, the inner support tool is installed in the inner hole of the integral part, which is used for preventing the deformation of the integral part during storage.

[0088] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of machining a thin-walled long-cylindrical part, characterized in that, The processing method sequentially comprises the following steps: Step S1, dividing the finished part size into several single cylinder segments, and then segmenting and blanking; Step S2, after blanking, using a three-roll plate rolling machine to roll the single cylinder segment, and spot welding and reinforcing the butt joint position; Step S3, using submerged arc welding method to weld the longitudinal seam of the single cylinder segment, and correcting the roundness of the cylinder segment after welding; Step S4, after standing for S1 time, performing radiographic inspection on the longitudinal seam of the single cylinder segment, and repairing the local weld with defects; Step S5, installing an inner supporting ring plate in the single cylinder segment for preventing oval deformation of the single cylinder segment during storage; Step S6, welding several single cylinder segments into an integral part, and welding flanges at both ends of the integral part, and performing radiographic inspection on the integral part after welding; Step S7, annealing and stress relieving the integral part; Step S8, installing process plugs at the flanges at both ends; Step S9, rough machining the outer circle of the integral part; Step S10, standing for S2 time; Step S11, finish machining the outer circle of the integral part; Step S12, installing several outer circle reinforcing clamps on the outer circle of the integral part for preventing oval deformation of the integral part after machining; Step S13, rough machining the inner diameter of the integral part; Step S14, standing for S3 time; Step S15, semi-finish machining the inner diameter of the integral part; Step S16, standing for S4 time; Step S17, finish machining the inner diameter of the integral part; Step S18, machining the outer circle and end face of the flanges at both ends of the integral part; Step S19, installing inner supporting tooling in the inner hole of the integral part for preventing deformation of the integral part during storage.

2. The method of claim 1, wherein The S1 time is 30-50 hours.

3. The method of claim 2, wherein The S2 time is 40-50 hours.

4. The method of claim 3, wherein The S3 time is 40-50 hours.

5. The method of claim 1, wherein The method of machining the end face and bevel of the single cylinder segment after rolling is adopted at step S6.

6. The method of claim 1, wherein The clamps are connected by bolts and nuts.

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