A method for processing a super-large-diameter thin-wall Y-shaped ring

Abstract

The application relates to a processing method for a super-large-diameter thin-wall Y-shaped ring, the Y-shaped ring is a Y-shaped rotary body, the diameter is 10m level, the inside is a cavity structure, and the end is not sealed, and the method comprises the following steps: rough turning a Y-shaped ring reference surface; rough turning Y-shaped ring inner and outer circles; removing internal stress vibration from the Y-shaped ring after rough turning, Y-shaped ring acceleration is controlled to be 30-70 m / s 2 ; further rough turning Y-shaped ring inner and outer shapes; removing internal stress vibration from the Y-shaped ring after further rough turning, Y-shaped ring acceleration is controlled to be 30-70 m / s 2 ; semi-finishing turning Y-shaped ring inner and outer shapes; removing internal stress vibration from the Y-shaped ring after semi-finishing turning, Y-shaped ring acceleration is controlled to be 30-70 m / s 2 ; and finishing turning Y-shaped ring inner and outer shapes to the final size. The application removes machining allowances step by step through twice rough machining and once semi-finishing machining, effectively controls machining deformation, and realizes high-precision machining.

Description

TECHNICAL FIELD

[0001] The application relates to a processing method for a super-large-diameter thin-wall Y-shaped ring and belongs to the technical field of clamping positioning and deformation. BACKGROUND

[0002] A storage tank is an important component of a carrier rocket and a missile weapon and needs to bear fuel internal pressure, axial pressure, torsion resistance and overload impact in a flight process. The Y-shaped ring is welded with a storage tank cylinder segment, a tank bottom and a short shell and plays a connecting role. The Y-shaped ring belongs to a frame Y-shaped ring with high appearance accuracy, large size and large curvature radius.

[0003] A traditional manufacturing process for a Y-shaped ring of a carrier rocket adopts sheet metal forming, and the process method has many problems: large residual stress, rebound phenomenon, cross section shape distortion and workpiece torsion in a forming process. A manufacturing process for a new generation of carrier rocket Y-shaped rings with a diameter of 5m adopts a clamping method of supporting a tire by an inner shape in finishing, and the method is difficult to support a transition ring with a diameter of 10m and cannot realize deformation control. For a thin-wall large-diameter Y-shaped ring, clamping positioning and deformation control are important factors affecting machining precision, and there is no solution in the prior art. SUMMARY

[0004] The application solves the technical problem of overcoming the deficiencies of the prior art and providing a processing method for a super-large-diameter thin-wall Y-shaped ring to effectively realize deformation control.

[0005] The technical solution of the application is as follows:

[0006] A processing method for a super-large-diameter thin-wall Y-shaped ring is a Y-shaped rotary body, the Y-shaped ring is a Y-shaped rotary body, the diameter is 10m, the inside is a cavity structure, the end is not sealed, and the method comprises the following steps.

[0007] Coarsely turning a reference surface of the Y-shaped ring:

[0008] The gap between the Y-shaped ring and the adhering surface of the workbench is not greater than 3mm, the Y-shaped ring is clamped in an inner and outer extrusion mode, the upper end surface is turned to a surface roughness of not greater than 25um, and the upper end surface is taken as the reference surface.

[0009] Coarsely turning the inner and outer circles of the Y-shaped ring:

[0010] The reference surface is adhered to the workbench, the Y-shaped ring is aligned, the upper end surface is pressed from the inside, the outer surface of the Y-shaped ring is coarsely turned to a surface roughness of not greater than 25um, and the outer circle diameter value is recorded.

[0011] The upper end surface is pressed from the outside, the inner surface of the Y-shaped ring is coarsely turned to a surface roughness of not greater than 25um, and the inner circle diameter value is recorded.

[0012] The Y-shaped ring after rough turning is removed from internal stress vibration, and the Y-shaped ring acceleration is controlled at 30-70 m / s 2 ;

[0013] Further rough turning Y-shaped ring inner and outer shape:

[0014] Connecting screw at the bottom of Y-shaped ring to tighten Y-shaped ring, turning out process edge on Y-shaped ring inner and outer shape;

[0015] Through the pressing plate to press the inner shape process edge, turning the outer shape of Y-shaped ring; reversing the pressing plate to press the outer shape process edge, turning the inner shape of Y-shaped ring; multiple inner and outer reversing pressing plate clamping mode in the processing process, layered turning of inner and outer shape, multiple cross removal of excess amount, uniform removal of inner and outer shape, each turning removal of excess amount 2-3mm, until the remaining single side excess amount 8-10mm;

[0016] The Y-shaped ring after further rough turning is removed from internal stress vibration, and the Y-shaped ring acceleration is controlled at 30-70 m / s 2 ;

[0017] Semi-finishing turning Y-shaped ring inner and outer shape:

[0018] Through the pressing plate to press the inner shape process edge, multiple inner and outer reversing pressing plate clamping mode in the semi-finishing turning process, layered turning of inner and outer shape, multiple cross removal of excess amount, uniform removal of inner and outer shape, each turning removal of excess amount 2-3mm, until the remaining single side excess amount 4-5mm;

[0019] The Y-shaped ring after semi-finishing turning is removed from internal stress vibration, and the Y-shaped ring acceleration is controlled at 30-70 m / s 2 ;

[0020] Finishing turning Y-shaped ring inner and outer shape to the final size:

[0021] Through the pressing plate to press the inner shape process edge, multiple inner and outer reversing pressing plate clamping mode in the finishing turning process, layered turning of inner and outer shape, multiple cross removal of excess amount, uniform removal of inner and outer shape, each turning removal of excess amount 0.5-1mm, finishing turning machine spindle speed 3-4r / min, tool feed speed 0.2-0.3mm / r, each tool feed amount 0.5-1mm.

[0022] Further, 30-50 pressing plates connected with the workbench are used to tightly press the inner and outer circles of Y-shaped ring.

[0023] Further, when the Y-shaped ring is aligned, the Y-shaped ring is adjusted to coincide with the center of rotation of the machine tool workbench, specifically: four guide positioning blocks are installed at the symmetric four points of the workbench, the inner surfaces of the four guide positioning blocks are consistent with the distance from the Y-shaped ring reference circle at the corresponding position, and the Y-shaped ring is placed on the pad plate located on the workbench along the four positioning blocks.

[0024] Further, when rough turning the inner and outer circles, the lathe spindle speed is 4-6r / min, the tool feed speed is 0.3-0.5mm / r, and the feed per tool is 2-3mm.

[0025] Further, when removing the internal stress vibration of the Y-shaped ring after rough turning, the vibration frequency is controlled to be 20-40Hz, and the Y-shaped ring vibration amplitude is 2-4mm.

[0026] Further, when further rough turning the inner and outer shapes of the Y-shaped ring, the lathe spindle speed is 4-6r / min, the tool feed speed is 0.4-0.5mm / r, and the feed per tool is 2-3mm.

[0027] Further, when further rough turning the inner and outer shapes of the Y-shaped ring, not less than 16-24 threaded holes with a depth of 30-40mm are drilled at the bottom of the Y-shaped ring, and the threaded holes are screwed into the threaded holes to tighten the Y-shaped ring.

[0028] Further, when removing the internal stress vibration of the Y-shaped ring after further rough turning, the vibration frequency is controlled to be 40-70Hz, and the Y-shaped ring vibration amplitude is 3-5mm.

[0029] Further, when semi-finishing turning the inner and outer shapes of the Y-shaped ring, the lathe spindle speed is 3-4r / min, the tool feed speed is 0.3-0.4mm / r, and the feed per tool is 1-1.5mm.

[0030] Further, when removing the internal stress vibration of the Y-shaped ring after semi-finishing turning, the vibration frequency is controlled to be 70-100Hz, and the Y-shaped ring vibration amplitude is 4-7mm.

[0031] The beneficial effects of the present application compared with the prior art are:

[0032] (1) The vibration aging treatment method is adopted multiple times in the machining process of the present application, so that the stress can be effectively released;

[0033] (2) The present application adopts twice rough machining and once semi-finishing machining to gradually remove the machining allowance, effectively controls the machining deformation, and realizes high-precision machining. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a Y-shaped ring structure schematic diagram of the present application;

[0035] Figure 2 It is a Y-shaped ring machining process flow chart of the present application;

[0036] Figure 3 It is a rough turning inner and outer shape structure schematic diagram of the present application;

[0037] Figure 4 It is a semi-finishing machining structure schematic diagram of the present application. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the embodiments.

[0039] A method for machining an ultra-large diameter thin-walled Y-ring as a Y-shaped rotating body, wherein the Y-ring is a Y-shaped rotating body with a diameter on the order of 10m, has an internal cavity structure, and has no end cap, comprising:

[0040] Rough machining of the Y-ring reference surface:

[0041] The gap between the Y-ring and the worktable contact surface is no more than 3mm. The Y-ring is clamped by internal and external extrusion. The upper end face is machined to a surface roughness of no more than 25μm, and the upper end face is used as the reference surface.

[0042] Rough machining of the inner and outer circles of the Y-shaped ring:

[0043] Fit the reference surface to the worktable; align the Y-ring, press the upper end face internally, rough machine the outer surface of the Y-ring until the surface roughness is no more than 25μm, and record the outer diameter value;

[0044] Press the upper end face externally, rough machine the inner surface of the Y-shaped ring until the surface roughness is no greater than 25μm, and then record the inner circle diameter value;

[0045] After rough machining, the Y-ring is subjected to stress-relief vibration, with the acceleration of the Y-ring controlled between 30-70 m / s². 2 ;

[0046] Further roughing out the inner and outer dimensions of the Y-shaped ring:

[0047] A screw is connected to the bottom of the Y-ring to tighten it, and a process pressing edge is machined on the inner and outer surfaces of the Y-ring.

[0048] The inner shape of the Y-shaped ring is pressed by pressing the inner edge with pressure plate 1, and the outer shape of the Y-shaped ring is machined. The outer shape of the Y-shaped ring is pressed by changing the pressure plate and the inner shape of the Y-shaped ring is machined. During the processing, the clamping method of the inner and outer pressure plates is changed multiple times, and the inner and outer shapes are machined in layers. The allowance is removed by crossing multiple times to make the inner and outer shapes remove the allowance evenly. Each machining removes 2-3mm of allowance until the remaining allowance on one side is 8-10mm.

[0049] After further rough machining, the Y-ring is subjected to stress-relief vibration, with the acceleration of the Y-ring controlled between 30-70 m / s². 2 ;

[0050] Semi-finished Y-shaped ring inner and outer dimensions:

[0051] The inner shape is pressed by pressing the edge with a pressure plate. During the semi-finish turning process, the clamping method of the pressure plate is changed multiple times. The inner and outer shapes are turned in layers and the excess is removed multiple times to make the inner and outer shapes remove the excess evenly. Each turning removes 2-3mm of excess until the remaining single-sided excess is 4-5mm.

[0052] The Y-shaped ring after semi-finishing machining is removed from the inner stress vibration, and the Y-shaped ring acceleration is controlled at 30-70 m / s 2 ;

[0053] The Y-shaped ring is finished to the final size:

[0054] The inner and outer shapes are layered and turned during the finishing process, and the inner and outer shapes are removed by multiple cross-removing allowances. The inner and outer shapes are uniformly removed by 0.5-1 mm each time. The spindle speed of the finishing machine is 3-4 r / min, the tool feed speed is 0.2-0.3 mm / r, and the feed per tool is 0.5-1 mm.

[0055] The Y-shaped ring is removed from the inner stress vibration, and the Y-shaped ring acceleration is controlled at 30-70 m / s

[0056] When the Y-shaped ring is aligned, the Y-shaped ring is adjusted to coincide with the center of rotation of the machine tool workbench. Specifically, four guide positioning blocks are installed at the symmetric four points of the workbench, the inner surface of the four guide positioning blocks is consistent with the distance from the Y-shaped ring reference circle at the corresponding position, and the Y-shaped ring is placed on the pad 2 on the workbench along the four positioning blocks.

[0057] When the inner and outer circles are rough turned, the spindle speed of the lathe is 4-6 r / min, the tool feed speed is 0.3-0.5 mm / r, and the feed per tool is 2-3 mm.

[0058] When the Y-shaped ring after rough turning is removed from the inner stress vibration, the vibration frequency is controlled at 20-40 Hz, and the Y-shaped ring vibration amplitude is 2-4 mm.

[0059] When the Y-shaped ring is further rough turned, the spindle speed of the machine tool is 4-6 r / min, the tool feed speed is 0.4-0.5 mm / r, and the feed per tool is 2-3 mm.

[0060] When the Y-shaped ring is further rough turned, not less than 16-24 threaded holes with a depth of 30-40 mm are drilled at the bottom of the Y-shaped ring, and the screw rod 3 is screwed into the threaded holes to tighten the Y-shaped ring.

[0061] When the Y-shaped ring after further rough turning is removed from the inner stress vibration, the vibration frequency is controlled at 40-70 Hz, and the Y-shaped ring vibration amplitude is 3-5 mm.

[0062] When the Y-shaped ring is semi-finished, the spindle speed of the machine tool is 3-4 r / min, the tool feed speed is 0.3-0.4 mm / r, and the feed per tool is 1-1.5 mm.

[0063] When the Y-shaped ring after semi-finishing machining is removed from the inner stress vibration, the vibration frequency is controlled at 70-100 Hz, and the Y-shaped ring vibration amplitude is 4-7 mm.

[0064] Embodiment

[0065] The application provides a processing method for a super-large-diameter thin-wall Y-shaped ring. Figure 2 The processing method comprises the following steps: rough machining, semi-finishing machining and cutting.

[0066] The following is an embodiment of the application, wherein a Ф10m Y-shaped ring is taken as an example. Figure 1 The Y-shaped ring is obtained by rolling and then machining a whole ring.

[0067] The processing method comprises the following steps:

[0068] (1) rough machining of a reference surface to see light;

[0069] The Y-shaped ring is clamped by means of internal and external extrusion, and the axial force is not applied to avoid deformation caused by the axial force.

[0070] (2) rough machining of an inner and outer circle to see light;

[0071] The four guide positioning blocks are symmetrically arranged on the workbench, and the inner surfaces of the four guide positioning blocks are arranged to be consistent with the distance from the product reference circle.

[0072] The inner pressure is applied to the upper end surface, the outer circle reference is rough machined, and the outer circle diameter value is recorded after light is seen.

[0073] The outer pressure is applied to the upper end surface, the outer circle reference is rough machined, and the inner circle diameter value is recorded after light is seen.

[0074] The spindle speed of the lathe is 4-6r / min, the cutter feeding speed is 0.3-0.5mm / r, and the feeding amount of each cutter is 2-3mm.

[0075] (3) Vibration aging to remove internal stress, control vibration frequency in 20-40Hz, Y ring vibration amplitude 2-4mm, Y ring acceleration control in 30-70m / s 2 ;

[0076] (4) Rough turning inner and outer shape, single side allowance 10mm;

[0077] In order to ensure firm clamping, uniform stress, use the height direction allowance, drill 16-M24, 40mm deep threaded hole at the bottom of the product, and use screw rod to tighten the part. Rough turning inner and outer shape, clamping method of multiple inner and outer reversing pressure plate during processing, layered turning of inner and outer shape, multiple cross removal of allowance, uniform removal of inner and outer shape, to reduce processing deformation. Rough turning machine spindle speed 4-6r / min, tool feed speed 0.4-0.5mm / r, each tool feed amount 2-3mm, remaining single side allowance 15mm, see Figure 3 .

[0078] (5) Vibration aging to remove internal stress, control vibration frequency in 40-70Hz, Y ring vibration amplitude 3-5mm, Y ring acceleration control in 30-70m / s 2 ;

[0079] (6) Semi-finish turning inner and outer shape, single side allowance 5mm;

[0080] Clamping method same as (4), semi-finish turning inner and outer shape, clamping method of multiple inner and outer reversing pressure plate during semi-finish turning, layered turning of inner and outer shape, multiple cross removal of 5mm allowance, uniform removal of inner and outer shape, to reduce processing deformation. Semi-finish turning machine spindle speed 3-4r / min, tool feed speed 0.3-0.4mm / r, each tool feed amount 1-1.5mm, remaining single side allowance 5mm, see Figure 4 .

[0081] (7) Vibration aging to remove internal stress, control vibration frequency in 70-100Hz, Y ring vibration amplitude 4-7mm, Y ring acceleration control in 30-70m / s 2 ;

[0082] (8) Finish turning inner and outer shape to final size;

[0083] Clamping method same as (4), finish turning inner and outer shape, layered turning of inner and outer shape, multiple cross removal of remaining allowance 5mm, ensure large end inner circle diameter Ф9500mm, large and small end welding area thickness 18mm. Finish turning machine spindle speed 3-4r / min, tool feed speed 0.2-0.3mm / r, each tool feed amount 0.5-1mm.

[0084] (9) Cut the part, ensure height 570mm.

[0085] The application adopts the method of integral forging ring mechanical milling, avoids the distortion and workpiece distortion problems in sheet metal forming method;

[0086] The clamping method of process edge pressing and bottom threaded hole drawing is adopted, compared with the integral inner support clamping method of Ф5m level, the production cost caused by mold investment and correction is reduced;

[0087] The vibration aging treatment method is adopted in the processing process, and the stress can be effectively released;

[0088] The application adopts twice rough machining and once semi-finishing machining to gradually remove the machining allowance, effectively control the machining deformation and realize high-precision machining;

[0089] Although the application has been disclosed as above with preferred embodiments, it is not intended to limit the application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the application by using the disclosed methods and technical contents without departing from the spirit and scope of the application, therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the application without departing from the technical solutions of the application, all belong to the protection scope of the technical solutions of the application.

Claims

1. A method of machining a large diameter thin walled Y-ring, characterized by, The Y-shaped ring is a Y-shaped rotary body, has a hollow structure, and has no end seal, and comprises: The Y-shaped ring is a Y-shaped rotary body, has a hollow structure, and has no end seal, and comprises: The gap between the Y-shaped ring and the workbench is not greater than 3mm, and the Y-shaped ring is clamped by inner and outer extrusion; the surface roughness of the upper end face after turning is not greater than 25μm, and the upper end face is used as the reference surface; The Y-shaped ring is a Y-shaped rotary body, has a hollow structure, and has no end seal, and comprises: The reference surface is attached to the workbench; the Y-shaped ring is aligned, the upper end face is pressed from the inside, and the outer surface of the Y-shaped ring is turned to a surface roughness of not greater than 25μm, and the outer diameter value is recorded after turning; The upper end face is pressed from the outside, the inner surface of the Y-shaped ring is turned to a surface roughness of not greater than 25μm, and the inner diameter value is recorded after turning; The Y-shaped ring after rough turning is subjected to stress removal vibration, and the acceleration of the Y-shaped ring is controlled at 30-70 m / s 2 ; Further turning the inner and outer shapes of the Y-shaped ring: Connect the screw rod at the bottom of the Y-shaped ring to tighten the Y-shaped ring, and turn the process edge on the inner and outer shapes of the Y-shaped ring; The inner shape process edge is pressed by the pressing plate, the outer shape of the Y-shaped ring is turned, the outer shape process edge is pressed by the pressing plate, and the inner shape of the Y-shaped ring is turned; the clamping method of the pressing plate is changed many times during the machining process, the inner and outer shapes are layered and turned, and the inner and outer shapes are uniformly removed many times, with a removal amount of 2-3mm each time, until the remaining single-sided allowance is 8-10mm; The Y-shaped ring after further rough turning is subjected to internal stress removal vibration, and the acceleration of the Y-shaped ring is controlled at 30-70 m / s 2 ; Semi-finishing turning the inner and outer shapes of the Y-shaped ring: The inner shape process edge is pressed by the pressing plate, the clamping method of the pressing plate is changed many times during the semi-finishing turning process, the inner and outer shapes are layered and turned, and the inner and outer shapes are uniformly removed many times, with a removal amount of 2-3mm each time, until the remaining single-sided allowance is 4-5mm; The Y-shaped ring after semi-finishing machining is subjected to vibration for removing internal stress, and the acceleration of the Y-shaped ring is controlled at 30-70 m / s 2 ; Finish turning the inner and outer shapes of the Y-shaped ring to the final size: The inner shape process edge is pressed by the pressing plate, the clamping method of the pressing plate is changed many times during the finishing turning process, the inner and outer shapes are layered and turned, and the inner and outer shapes are uniformly removed many times, with a removal amount of 0.5-1mm each time, the spindle speed of the finishing turning machine is 3-4r / min, the tool feed speed is 0.2-0.3mm / r, and the tool feed amount is 0.5-1mm per tool. When aligning the Y-shaped ring, adjust the Y-shaped ring to coincide with the center of rotation of the machine tool workbench, specifically: install guide positioning blocks at the symmetric four points of the workbench, the inner surfaces of the four guide positioning blocks are the same distance from the reference circle of the Y-shaped ring at the corresponding position, and place the Y-shaped ring on the workbench pad along the four positioning blocks.

2. The method for processing an ultra-large diameter thin-walled Y-ring according to claim 1, characterized in that, Each side of the Y-shaped ring is clamped by 30-50 pressing plates connected to the workbench to tighten the Y-shaped ring.

3. The method of claim 1, wherein the Y-ring has a diameter of 1.5 to 3.5 meters and a wall thickness of 0.5 to 1.5 inches. When rough turning the inner and outer circles, the spindle speed of the lathe is 4-6r / min, the tool feed speed is 0.3-0.5mm / r, and the tool feed amount is 2-3mm per tool.

4. The method of claim 1, wherein the Y-ring has a diameter of 1.5 to 3.5 meters and a wall thickness of 0.5 to 1.5 inches. When removing the internal stress vibration of the Y-shaped ring after rough turning, control the vibration frequency to be 20-40Hz, and the Y-shaped ring vibration amplitude is 2-4mm.

5. The method of claim 1, wherein the Y-ring has a diameter of 1.5 to 3.5 meters and a wall thickness of 0.5 to 1.5 inches. When further rough turning the inner and outer shapes of the Y-shaped ring, the spindle speed of the machine tool is 4-6r / min, the tool feed speed is 0.4-0.5mm / r, and the tool feed amount is 2-3mm per tool.

6. The method of claim 1, wherein When further rough turning the inner and outer shapes of the Y-shaped ring, drill not less than 16-24 threaded holes with a depth of 30-40mm at the bottom of the Y-shaped ring, and tighten the Y-shaped ring by screwing the screw rod into the threaded holes.

7. The method of claim 1, wherein the Y-ring has a diameter of 1.5 to 3.5 meters and a wall thickness of 0.5 to 1.5 inches. When removing the internal stress vibration of the Y-shaped ring after further rough turning, control the vibration frequency to be 40-70Hz, and the Y-shaped ring vibration amplitude is 3-5mm.

8. The method of claim 1, wherein the Y-ring has a diameter of 1.5 to 3.5 meters and a wall thickness of 0.5 to 1.5 inches. When the inner and outer shapes of the semi-finish Y-shaped ring are machined, the spindle speed of the machine tool is 3-4 r / min, the tool feed speed is 0.3-0.4 mm / r, and the feed per tool is 1-1.5 mm.

9. The method of claim 1, wherein the Y-ring has a diameter of 1.5 to 3.5 meters and a wall thickness of 0.5 to 1.5 inches. When the semi-finish Y-shaped ring is removed from the inner stress vibration, the vibration frequency is controlled at 70-100 Hz, and the vibration amplitude of the Y-shaped ring is 4-7 mm.

Images