A processing method for thin-wall vortex end sealing sleeve

Abstract

The application discloses a processing method for a thin-wall vortex end sealing sleeve, which can realize the processing of the special thin-wall vortex end sealing sleeve part, and meanwhile, the required size and shape tolerance of the part are ensured. The method comprises the following steps: turning the two end faces of the part blank to remove surface impurities; performing flaw detection to ensure that the part blank is free of defects; clamping the outer circle of the part by three claws, and performing end face alignment, rough turning of one end face and inner hole of the part; supporting the inner hole by soft three claws, and performing end face alignment, rough turning of the other end face and outer circle of the part; milling the petal shape on the thin wall of the part, and drilling through holes on each petal part; supporting the inner hole by soft three claws, and performing end face alignment, fine turning of one end face of the part; using a turning tool, fine turning of the other end face, outer circle and inner hole of the part; using an 80 clamp; and performing 90 inspection.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a method for machining a thin-walled vortex end seal sleeve. Background Technology

[0002] like Figure 1 The image shows a vortex end seal sleeve, a component used in magnetic levitation high-speed motors. Made of TC4 titanium alloy, this part is primarily used for axial gas sealing. It has a unique structure: a maximum diameter of Ф326mm, a wall thickness of only 4±0.01mm at the petal-like section, and a minimum thickness of only 3.7mm. Furthermore, the flatness of the petal-like section requires a high precision, not exceeding 0.015mm. Due to the component's special structure and high dimensional accuracy requirements, a suitable machining method is necessary to complete its fabrication. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for processing thin-walled vortex end seal sleeves, which can realize the processing of such special thin-walled vortex end seal sleeve parts, while ensuring the required dimensions and geometric tolerances of the parts.

[0004] The objective of this invention is achieved as follows:

[0005] A method for manufacturing a thin-walled vortex end sealing sleeve includes the following steps:

[0006] 10 cars

[0007] Remove surface impurities from both ends of the machined part blank;

[0008] 20 flaw detection

[0009] Perform flaw detection to ensure that the part blanks are free of defects;

[0010] 30 rough car

[0011] Three-jaw clamps the outer circle, with the end face flat, for rough machining one end face and inner hole of the part;

[0012] 40 rough car

[0013] The soft three-jaw jack supports the inner hole, with the end face flat, and the other end face and outer circle of the part are rough-machined.

[0014] 50 CNC milling

[0015] Mill out the petal shape on the thin wall of the part, and at the same time drill through holes in each petal part;

[0016] 60 precision lathe

[0017] The inner hole of the soft three-jaw support is flat, and one end face of the part is precision machined.

[0018] 70 precision lathe

[0019] Using machining tools, precision machine the other end face, (φ170) outer diameter, and inner hole of the part;

[0020] 80 clamps;

[0021] 90% inspection.

[0022] Furthermore, the turning tool includes a tool body, an outer pressure plate, and an inner pressure plate. The tool body has a stepped inner hole. The small diameter section of the stepped inner hole is used for turning clearance, the middle diameter section is used for clearance fit positioning with the small end of the part, and the large diameter section is used for clearance against the tapered surface of the part. The end face of the tool body is used for fitting and positioning against the thin-walled end face of the part. The outer pressure plate is annular, and its inner hole is used for clearance when machining the inner hole of the part. The outer pressure plate is used to press against the outer side of the thin-walled part. The inner pressure plate is circular and is used to press against the inner side of the thin-walled part. The tool body is provided with screw holes for connecting the outer pressure plate and the inner pressure plate. The stepped structure also allows screws to connect the tool body, the outer pressure plate, and the inner pressure plate.

[0023] Furthermore, the inner pressure plate has a relief cavity that provides clearance for the protruding portion of the part.

[0024] Furthermore, the 70 processes include:

[0025] Mount the tool body onto the lathe's three-jaw chuck and align the tool body;

[0026] Position the part into the tool body;

[0027] Install the outer pressure plate, lightly tighten the screws, and after rechecking that the runout of the inner hole of the part is no more than 0.05, tighten the screws completely, and machine the end face and inner hole of the part not covered by the outer pressure plate until they are qualified.

[0028] Install the inner pressure plate, tighten the screws, clamp the part, remove the outer pressure plate, and machine the end face of the part not covered by the inner pressure plate until it meets the requirements. The entire end face is machined in two steps.

[0029] By adopting the above technical solution, the present invention enables the processing of thin-walled vortex end sealing sleeve parts with such special structures, while ensuring the required dimensions and geometric tolerances of the parts. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of the part;

[0031] Figure 2 This is a schematic diagram of 30 processes;

[0032] Figure 3 This is a schematic diagram of 40 processes;

[0033] Figure 4 This is a schematic diagram of the 60-step process;

[0034] Figure 5 This is a schematic diagram of the 70-step process;

[0035] Figure 6 A structural diagram of a vehicle tool;

[0036] Figure 7 This is a schematic diagram of the tool body.

[0037] Figure Labels

[0038] In the attached diagram, 1 is the tool body, 2 is the outer pressure plate, 3 is the screw that fixes the outer pressure plate, 4 is the inner pressure plate, and 5 is the screw that fixes the inner pressure plate. Detailed Implementation

[0039] (1) Selection of part blanks:

[0040] The part has a total axial thickness of 25mm and a maximum outer diameter of Ф326mm. Therefore, TC4 sheet material with dimensions of δ35 (thickness) × Ф330 (outer diameter) × Ф150 (inner diameter) is selected for machining the part. The raw material should meet the requirements of BG / T3621-2007 "Titanium-based Alloy Sheets" to ensure that the mechanical properties and chemical composition of the part meet the requirements.

[0041] Note: The above blank specifications can be freely selected according to your own processing conditions, as long as there is enough allowance for processing parts.

[0042] (2) Flaw detection of parts (processes 10 and 20)

[0043] The outer diameter of the sheet metal is machined using a three-jaw clamp, and both end faces are machined to a thickness of 33mm with a surface roughness not exceeding Ra3.2. This removes surface impurities from the sheet metal to avoid affecting the ultrasonic testing in process 20. Testing is performed according to GB / T 5193-2007, with an acceptance level of AA, ensuring that all raw materials used are defect-free.

[0044] (3) Rough turning of the parts (processes 30 and 40)

[0045] according to Figure 2 , Figure 3 Rough machining of parts, removing large excess material.

[0046] (4) CNC milling parts

[0047] Twelve notches are milled out, and 12 through holes of Ф17 are drilled simultaneously. This process pre-machines the part's shape to its dimensions to avoid deformation during milling.

[0048] (5) Finish-machined parts (processes 60 and 70)

[0049] according to Figure 4 , Figure 5For precision machining of parts, the CTHM220-CG024 vortex end seal machining tool is used during the 70th precision machining process. After the 60th precision machining process is completed, considering that there is no suitable clamping position for the part during the 70th precision machining process, and in order to ensure the part dimension of 4±0.01 and flatness of 0.015, a machining tool is designed for this process.

[0050] How to use car tools:

[0051] ① Install the lathe tool onto the lathe's three-jaw chuck and align the tooling.

[0052] ② The part has already been machined to an outer diameter of Ф176 in process 60. 0 -0.025 Tool hole Ф176 +0.046 Position the part with the end face flush, install the external pressure plate, lightly tighten the screws, and after rechecking that the runout of the inner hole of the part is no more than 0.05, thoroughly tighten the screws, and machine the end face and inner hole of the part to the requirements of the drawing.

[0053] ③ Install the inner pressure plate, tighten the screws, press the parts, remove the outer pressure plate, and machine the end face of the parts to a thickness of 4±0.01mm, while ensuring a flatness of 0.015.

[0054] Specifically:

[0055] 1. During machining, first install the tool body 1 onto the lathe chuck;

[0056] 2. Place the part into tool body 1. At this point, install the outer pressure plate of the tool body into tool body 1 using the hexagonal head screws in part 3, simultaneously pressing the right end face of part 4±0.01 (completely covering the petal-shaped part). Parts 4 and 5, which are not yet installed with fixtures, should be aligned so that the internal hole runout of the part is no greater than 0.05 before machining. Figure 5 The outer diameter is R2, Ф170, the chamfer is 1×30°, the right end face is 13.9, and the inner hole is Ф160.

[0057] 3. After the end face, outer circle, and inner hole are machined as described above, keep the tooling parts stationary and stop the machine tool. At this time, install the inner pressure plate of tool body 14 onto part 1 using the hex socket screws of part 5, and simultaneously clamp the part. After the inner pressure plate clamps the part, remove the outer pressure plate of part 2. At this time, the right end face of 4±0.01 can be machined.

[0058] (6) Deburring and engraving by fitter (80 steps)

[0059] Remove burrs from the parts during machining, blunt sharp edges, and engrave text at the same time.

[0060] (7) Penetrant testing (90 steps)

[0061] Penetrant testing shall be conducted in accordance with NB / T 47013.5-2015. Acceptance level: Level I, to ensure that no cracks are generated in the parts during the processing and to guarantee the sealing effect of the parts.

[0062] In the EE diagram, the notch at the top, 4-20, allows for the use of an outside micrometer to accurately measure the thickness dimension of 4±0.01 from four directions.

[0063] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A method for processing a thin-walled vortex end sealing sleeve, characterized in that, The process includes the following steps: 10 cars Remove surface impurities from both ends of the machined part blank; 20 flaw detection Perform flaw detection to ensure that the part blanks are free of defects; 30 rough car Three-jaw clamps the outer circle, with the end face flat, for rough machining one end face and inner hole of the part; 40 rough car The soft three-jaw jack supports the inner hole, with the end face flat, and the other end face and outer circle of the part are rough-machined. 50 CNC milling Mill out the petal shape on the thin wall of the part, and at the same time drill through holes in each petal part; 60 precision lathe The inner hole of the soft three-jaw support is flat at the end face, and one end face of the part is precision machined. 70 precision lathe Using machining tools, precision machine the other end face, outer diameter, and inner hole of the part; 80 clamps; 90% inspection; The turning tool includes a tool body, an outer pressure plate, and an inner pressure plate. The tool body has a stepped inner hole. The small diameter section of the stepped inner hole is used for turning clearance, the middle diameter section of the stepped inner hole is used for clearance fit positioning with the small end of the part, and the large diameter section of the stepped inner hole is used for clearance against the tapered surface of the part. The end face of the tool body is used for fitting and positioning against the thin-walled end face of the part. The outer pressure plate is annular. The inner hole of the outer pressure plate is used for clearance when machining the inner hole of the part. The outer pressure plate is used to press against the outer side of the thin wall of the part. The inner pressure plate is circular. The inner pressure plate is used to press against the inner side of the thin wall of the part. The tool body is provided with screw holes for connecting the outer pressure plate and the inner pressure plate. The 70 processes include: Mount the tool body onto the lathe's three-jaw chuck and align the tool body; Position the part into the tool body; Install the outer pressure plate, lightly tighten the screws, recheck the inner hole of the part, and then tighten the screws completely. Machine the end face and inner hole of the part not covered by the outer pressure plate until they are qualified. Install the inner pressure plate, tighten the screws, press the part, remove the outer pressure plate, and machine the end face of the part not covered by the inner pressure plate until it is qualified.

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