A method for processing ultra-thin adjustment ring

Abstract

The present invention discloses a method for machining ultra-thin adjustment rings, comprising the following steps: preparing a blank, turning a mounting edge, turning the remaining inner and outer ring surfaces of the annular blank until reaching the second axial end of the annular blank, pressing the inner ring groove of the mounting edge during turning, heat treatment to remove machining stress, turning a datum, precision turning the outer circle and cutting to obtain an adjustment ring, repeating the previous steps to cut a piece of annular blank to obtain multiple semi-finished adjustment rings, grinding the two axial end faces of the semi-finished adjustment rings, and removing surface burrs from the semi-finished adjustment rings. The present invention solves the processing difficulties encountered in the manufacturing process of thin adjustment rings made of titanium alloys or high-temperature alloys, achieves parallelism and thickness that meet technical requirements, and improves the first-time machining pass rate.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation engine manufacturing, and in particular relates to a method and a fixture for processing an ultra-thin adjustment ring of titanium alloy or high-temperature alloy. Background Art

[0002] like Figure 1 The figure shows a thin adjustment ring. The design requirement of the adjustment ring is that the thickness of the part meets L = 0.20 -0.06 ~3.5 -0.06 The adjustment ring is made of high-temperature alloy or titanium alloy, which results in large deformation, low machining efficiency, and poor end face parallelism during the adjustment ring machining process, resulting in a low final part qualification rate.

[0003] In order to solve the problem of difficulty in ensuring parallelism of 0.03 and low processing efficiency during the processing and manufacturing of thin adjustment rings, it is necessary to try new processing methods. Summary of the Invention

[0004] The present invention aims to provide a method for processing an ultra-thin adjustment ring, solve the processing difficulties in the processing and manufacturing of thin adjustment rings, obtain parallelism and thickness that meet technical requirements, and improve the processing qualification rate.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for processing an ultra-thin adjustment ring comprises the following steps:

[0007] S1, raw material preparation, select ring parts as raw materials;

[0008] S2, turning the mounting edge, moving the tool from the first axial end toward the second axial end of the annular blank, turning a distance between the inner annular surface and the outer annular surface of the annular blank as the mounting edge, and turning an inner annular groove on the turned inner annular surface near the end surface of the first axial end of the annular blank. During turning and clamping, only clamp the annular blank near the second axial end. Radial clamping near the mounting edge of the annular blank is not allowed.

[0009] S3, turning the remaining parts of the inner and outer ring surfaces of the annular blank until reaching the second axial end of the annular blank, pressing the inner ring groove of the mounting edge during turning;

[0010] S4, heat treatment to remove the machining stress in S2 and S3;

[0011] S5, turning the datum, pressing the inner ring groove of the mounting edge, turning the first axial end face of the annular blank to obtain a datum surface with flatness that meets the requirements;

[0012] S6, precision turning the outer circle and cutting off to obtain the adjustment ring, pressing the inner ring groove of the mounting edge, first precision turning the axial second end face of the annular blank, then precision turning the outer ring surface of the annular blank from the axial second end toward the axial first end, then cutting an outer ring groove from the precision turned outer ring surface along the radial direction of the annular blank toward the inner ring surface, the groove bottom of the outer ring groove is a distance away from the inner ring surface, finally starting from the axial second end of the annular blank close to the inner ring surface, cutting along the axial direction of the annular blank until it intersects with the outer ring groove to complete the cutting, and the part falling from the annular blank is a semi-finished adjustment ring;

[0013] S7, repeat S6, cutting a piece of annular raw material to obtain a plurality of semi-finished adjustment rings;

[0014] S8, grinding the two axial end faces of the semi-finished adjusting ring;

[0015] S9, remove the surface burrs of the semi-finished adjusting ring.

[0016] Furthermore, in S6, the tool width of the turning tool when cutting the outer ring groove is larger than the machining allowance reserved for the end face of the semi-finished product of the adjustment ring.

[0017] Furthermore, in S8, a circular table surface grinder is used to grind two axial end faces of the semi-finished adjusting ring.

[0018] Furthermore, in the above S8, four arc-shaped plates with a length of 1 / 4 of the circumference are used to form an annular fixture, and the inner ring surface of the annular fixture forms a limiting surface for limiting the semi-finished product of the adjustment ring.

[0019] Furthermore, the axial cross-section of the arc-shaped plate is stepped, and the thickness of the axial cross-section decreases step by step from the inside to the outside of the arc-shaped plate, and the maximum thickness of the axial cross-section is less than the axial thickness of the semi-finished adjustment ring.

[0020] Furthermore, in S3 and S6, the axial first end face of the annular blank is used as the positioning surface to press the inner ring groove at the mounting edge axially, and at the same time press the inner ring surface close to the axial first end and the inner ring groove radially.

[0021] As an option, the ultra-thin adjustment ring is made of titanium alloy or high-temperature alloy.

[0022] Compared with the prior art, the processing method provided by the present invention solves the problems of difficult end surface processing of ultra-thin adjustment rings made of thin-walled weak magnetic materials, large part deformation, low processing efficiency and poor parallelism.

[0023] Compared with the existing processing methods, the present invention has the following advantages:

[0024] 1) The present invention utilizes a special annular fixture to grind the end surface of the ultra-thin part to provide auxiliary support for the adjustment ring, thereby significantly improving the qualified rate of the parallelism of the end surface of the adjustment ring.

[0025] 2) The present invention can be used for processing ultra-thin adjustment rings of different weak magnetic materials, and in particular improves the cutting method of the semi-finished adjustment ring. By opening an inner ring groove on the adjustment ring, the adjustment ring base itself is cleverly used for auxiliary support, effectively solving the problem of cutting the ultra-thin adjustment ring parts, ensuring the consistency of the thickness of the adjustment ring, and having promotion significance for other parts with similar structures, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the parts diagram of the ultra-thin titanium alloy adjustment ring;

[0027] Figure 2 For the rough material map;

[0028] Figure 3 Schematic diagram of the machining installation edge;

[0029] Figure 4 Schematic diagram of the remaining parts of the inner and outer ring surfaces during lathing;

[0030] Figure 5 This is a schematic diagram of the vehicle base;

[0031] Figure 6 This is a schematic diagram of the existing cutting scheme;

[0032] Figure 7 Schematic diagram of the cutting scheme in the present invention;

[0033] Figure 8 This is a schematic diagram of cutting multiple semi-finished adjustment rings from a piece of raw material;

[0034] Figure 9 This is a schematic diagram of the grinding end face of the semi-finished adjusting ring;

[0035] Figure 10 Schematic diagram of the ring fixture used for grinding the end face of the semi-finished adjusting ring;

[0036] Figure 11 Schematic diagram of deburring the semi-finished adjusting ring. DETAILED DESCRIPTION

[0037] The present invention is further described below with reference to specific embodiments. However, it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various modifications, substitutions and changes made according to common technical knowledge and customary means in the field are included in the scope of the present invention.

[0038] against Figure 1 The present invention provides a new solution for the ultra-thin titanium alloy adjustment ring shown in FIG. , which specifically includes the following contents:

[0039] 1) Choose the wool material:

[0040] like Figure 2 As shown, ring parts are used as raw materials. Before processing, check whether the state of the raw materials meets the requirements of the design drawings, check the surface quality of the parts, and check the batches marked with stamps.

[0041] 2) Turning the mounting edge:

[0042] Select one axial end of the annular blank as the installation edge and turn out the installation edge, such as Figure 3 As shown, with the second axial end face of the annular blank as the positioning, radial clamping is performed on the circumferential surface near the second end of the annular blank. Turning is started from the upper end to the lower end. The turning position includes the inner and outer annular surfaces of the annular blank. After turning a certain distance, it stops and a notch is cut on the inner annular surface to serve as the inner ring groove. The inner ring groove facilitates compaction and axial force in subsequent processes. During turning, radial clamping should not be performed near the mounting edge, otherwise it will cause part deformation.

[0043] 3) Turn the remaining inner and outer ring surfaces until the other end:

[0044] like Figure 4 , press the inner ring groove on the processed mounting edge, match the radial tightening of the inner ring surface close to the inner ring groove and the axial first end, and position the axial first end face, and remove the remaining thickness on the inner ring surface and the outer ring surface based on the turning of the inner ring surface and the outer ring surface in the above 2) (that is, Figure 3 The thickness between the inner ring surface and the outer ring surface is turned to be consistent, Figure 3 There are two thicknesses between the inner ring surface and the outer ring surface, and the inner ring surface and the outer ring surface of the annular raw material are turned to the second axial end.

[0045] 4) Heat treatment:

[0046] The annular raw material after turning is heat treated to eliminate turning stress.

[0047] 5) Car benchmark:

[0048] like Figure 5 , through the axial second end positioning of the annular blank, press the inner ring groove of the mounting edge and the radial direction of the outer peripheral surface close to the axial second end, and the end face of the mounting edge ( Figure 5 The upper end of the ring, that is, the axial first end face of the annular raw material, is repaired to a reference, and the flatness is not greater than 0.15.

[0049] 6) Finish turning the outer ring surface and cutting along the radial direction to obtain the semi-finished adjustment ring:

[0050] If you follow Figure 6 The order shown ( Figure 6 The order of ①, ②, ③, ④) and the method ( Figure 6 The middle long arrow indicates the turning tool direction) for cutting, then during the final cutting in process ④, the parts have poor rigidity and severe deformation, the flatness of the cut surface is only 0.5mm after cutting, and the wall thickness cannot be guaranteed. Figure 6 The processing route has poor flatness after cutting the thin-walled ring, resulting in the wall thickness size cannot be guaranteed during the fine turning of the end face and the fine turning of the outer circle. The outer diameter size is also prone to deviation due to part deformation. The deviation rate of this process route and processing method is 100%.

[0051] like Figure 7 , a combined cutting method is adopted, that is, radial cutting first and then axial cutting, with the axial first end face of the annular raw material as the positioning surface, pressing the inner ring groove axially at the installation edge, and at the same time pressing the inner ring surface radially near the axial first end and the inner ring groove, and then according to Figure 7 The sequential processing of ①, ②, ③, and ④ is: first, the outer ring surface is precision turned, and then an outer ring groove is turned on the outer ring surface. The bottom of the outer ring groove is at a distance D from the inner ring surface. It is no longer a single radial cutting, but the final cutting is achieved by axial turning the inner ring surface and the outer ring groove intersecting. This method changes the traditional cutting method while ensuring 100% compliance with the wall thickness size.

[0052] like Figure 8 In order to ensure the consistency of the wall thickness of the adjustment ring, multiple adjustment rings are obtained by cutting the same annular raw material at equal intervals along the axial direction. Figure 8 The figure shows the cutting state of 8 adjustment rings from I to VIII. 7) Grinding the two end faces:

[0053] Since titanium alloy is a weak magnetic material, it cannot be adsorbed on the rotary table surface grinder, so a Figure 10 The special fixture shown is used for limiting, which can realize the grinding of both end faces of the ultra-thin titanium alloy adjustment ring on the circular table surface grinder, thereby ensuring that the parallelism of the two end faces is not greater than 0.03.

[0054] The fixture is designed as Figure 10 As shown, the clamp consists of four arc plates measuring one-quarter of the circumference, joined to form a ring with a small gap at the joint. The inner diameter of the joined ring, φA, equals the outer diameter of the adjustment ring, φA, and the thickness, H, equals the adjustment ring thickness, L - 0.25. The clamp is made of strong magnetic material to ensure secure attachment to the grinder's worktable.

[0055] For example, if the outer diameter of the adjustment ring is φA=Φ487, then the inner diameter of the fixture is φA=ΦΦ487±0.2;

[0056] Part thickness L = 2.1mm, limit fixture thickness H = 2.1-0.25 = 1.85mm;

[0057] The wall thickness between the inner circle and the outer circle of the limiting fixture is B.

[0058] After clamping with a special fixture, grind the two end faces into flat surfaces, such as Figure 9 , ensure the parallelism requirements of the two end faces.

[0059] 8) Deburring:

[0060] Remove the burrs on the adjusting ring surface after grinding the two axial end faces. The burr positions are as follows: Figure 11 D1 shown in the figure is then surface trimmed to meet the surface finish requirements.

[0061] 9) Inspection:

[0062] Check whether there are burrs or bumps on the surface of the adjusting ring, and check the batch number of the parts.

[0063] Any matters not described in detail in the present specification are prior art known to those skilled in the art. Although the above description of the present invention is based on illustrative embodiments to facilitate understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the specific embodiments. As long as various modifications are within the spirit and scope of the present invention as defined and determined by the appended claims, such modifications will be obvious to those skilled in the art, and all inventions and creations utilizing the concepts of the present invention are protected.

Claims

1. A method for processing an ultra-thin adjustment ring, characterized in that: The following steps are involved: S1, raw material preparation, select ring parts as raw materials; S2, turning the mounting edge, moving the tool from the first axial end toward the second axial end of the annular blank, turning a distance between the inner annular surface and the outer annular surface of the annular blank as the mounting edge, and turning an inner annular groove on the turned inner annular surface near the end surface of the first axial end of the annular blank. During turning and clamping, only clamp the annular blank near the second axial end. Radial clamping near the mounting edge of the annular blank is not allowed. S3, turning the remaining parts of the inner and outer ring surfaces of the annular blank until reaching the second axial end of the annular blank, pressing the inner ring groove of the mounting edge during turning; S4, heat treatment to remove the machining stress in S2 and S3; S5, turning the datum, pressing the inner ring groove of the mounting edge, turning the first axial end face of the annular blank to obtain a datum surface with flatness that meets the requirements; S6, precision turning the outer circle and cutting off to obtain the adjustment ring, pressing the inner ring groove of the mounting edge, first precision turning the axial second end face of the annular blank, then precision turning the outer ring surface of the annular blank from the axial second end toward the axial first end, then cutting an outer ring groove from the precision turned outer ring surface along the radial direction of the annular blank toward the inner ring surface, the groove bottom of the outer ring groove is a distance away from the inner ring surface, finally starting from the axial second end of the annular blank close to the inner ring surface, cutting along the axial direction of the annular blank until it intersects with the outer ring groove to complete the cutting, and the part falling from the annular blank is a semi-finished adjustment ring; S7, repeat S6, cutting a piece of annular raw material to obtain a plurality of semi-finished adjustment rings; S8, grinding the two axial end faces of the semi-finished adjusting ring; S9, remove the surface burrs of the semi-finished adjusting ring.

2. The method for processing an ultra-thin adjustment ring according to claim 1, characterized in that: In the above-mentioned S6, when cutting the outer ring groove, the tool width of the turning tool is larger than the machining allowance reserved for the end face of the semi-finished product of the adjusting ring.

3. The method for processing an ultra-thin adjustment ring according to claim 1, characterized in that: In S8, a circular table surface grinder is used to grind the two axial end faces of the semi-finished adjusting ring.

4. The method for processing an ultra-thin adjustment ring according to claim 1, characterized in that: In the above S8, four arc-shaped plates with a length of 1 / 4 of the circumference are used to form an annular fixture, and the inner ring surface of the annular fixture forms a limiting surface for limiting the semi-finished product of the adjustment ring.

5. The method for processing an ultra-thin adjustment ring according to claim 4, characterized in that: The axial cross section of the arc plate is stepped, and the thickness of the axial cross section decreases step by step from the inner side to the outer side of the arc plate. The maximum thickness of the axial cross section is less than the axial thickness of the semi-finished adjustment ring.

6. The method for processing an ultra-thin adjustment ring according to claim 1, characterized in that: In S3 and S6, the axial first end face of the annular blank is used as the positioning surface to press the inner ring groove at the mounting edge axially, and at the same time press the inner ring surface close to the axial first end and the inner ring groove radially.

7. The method for processing an ultra-thin adjustment ring according to claim 1, characterized in that: The material of the ultra-thin adjustment ring is titanium alloy or high-temperature alloy.

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