Ultrathin adjusting ring machining method

Abstract

The invention discloses a processing method of an ultrathin adjusting ring, which comprises the following steps in sequence: preparing a blank, turning a mounting edge, and turning the rest parts of the inner ring surface and the outer ring surface of the annular blank until the rest parts reach the axial second end of the annular blank, performing heat treatment to remove turning stress; turning a reference; performing finish turning on an outer circle and cutting off to obtain an adjusting ring; repeating the previous step to cut off an annular blank to obtain a plurality of semi-finished adjusting rings, grinding two axial end surfaces of the semi-finished adjusting rings, and removing burrs on the surfaces of the semi-finished adjusting rings. The machining problem in the machining and manufacturing process of the titanium alloy or high-temperature alloy thin adjusting ring is solved, the parallelism and the thickness meeting the technical requirements are obtained, and the one-time machining qualification rate is increased.

Description

Technical Field

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

[0002] like Figure 1 The figure shows a thin adjustment ring, the design requirement of which is that the thickness of the part satisfies L = 0.20 -0.06 ~3.5 -0.06 mm, and the parallelism requirement of the two end faces of the adjustment ring is 0.03. Since the part material is high-temperature alloy or titanium alloy, the part deformation is large, the processing efficiency is low, and the end face parallelism is poor during the adjustment ring processing, 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 process of the thin adjustment ring, obtain the parallelism and thickness that meet the 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, selecting a ring part as the raw material;

[0008] S2, turning the installation edge, moving the tool from the first axial end to the second axial end of the annular blank, turning a distance between the inner ring surface and the outer ring surface of the annular blank as the installation edge, and turning an inner ring groove on the turned inner ring surface at a position close to the end surface of the first axial end of the annular blank. During turning and clamping, only clamp the annular blank at the second axial end, and radial clamping near the installation edge of the annular blank is not allowed;

[0009] S3, turning the remaining parts of the inner ring surface and the outer ring surface of the annular blank until reaching the axial second end of the annular blank, and 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 axial first end face of the annular rough material to repair the datum, and obtaining a datum surface with a flatness that meets the requirements;

[0012] S6, finish turning the outer circle and cutting to obtain the adjustment ring, press the inner ring groove of the mounting edge, first finish turning the axial second end face of the annular blank, then finish turning the outer ring surface of the annular blank from the axial second end toward the axial first end, then cut an outer ring groove from the finished 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, cut along the axial direction of the annular blank until it intersects with the outer ring groove and completes the cutting, and the part falling from the annular blank is a semi-finished adjustment ring;

[0013] S7, repeat S6, cutting off a piece of annular rough 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, 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 adjustment ring.

[0017] Furthermore, in S8, two axial end faces of the semi-finished adjusting ring are ground using a circular table surface grinder.

[0018] Furthermore, in S8, four arc-shaped plates with a length of 1 / 4 of a circle are used to form an annular fixture, and the inner annular 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 plate is step-shaped, and the thickness of the axial cross section decreases step by step from the inside to the outside of the arc 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 rough material is used as the positioning surface to press the inner annular groove at the mounting edge axially, and at the same time press the inner annular surface close to the axial first end and the inner annular 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 deformation of parts, 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 uses a special annular fixture to grind the end surface of the ultra-thin part to assist in supporting the adjustment ring, thereby greatly improving the pass 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, which effectively solves the problem of cutting the ultra-thin adjustment ring parts and ensures the consistency of the thickness of the adjustment ring. It has promotional 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 A schematic diagram of the remaining parts of the inner and outer ring surfaces being machined;

[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 It is a schematic diagram of the cutting scheme in the present invention;

[0033] Figure 8 A schematic diagram of cutting off a plurality of semi-finished adjustment rings from a piece of raw material;

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

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

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

[0037] The present invention is further described below in conjunction with specific embodiments, but 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-mentioned 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 the figure, 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 marked batches.

[0041] 2) Turning the installation edge:

[0042] Select one axial end of the annular rough material as the installation edge and turn out the installation edge, such as Figure 3 As shown, the axial second end face of the annular blank is used as the positioning, and the circumferential surface close to the second end of the annular blank is radially clamped, and turning is started from the upper end to the lower end. The turning position includes the inner and outer ring surfaces of the annular blank. After turning for a certain distance, it stops, and a notch is opened on the inner ring surface as an inner ring groove. The inner ring groove is convenient for subsequent processes to press and bear axial force. During turning, radial clamping cannot be performed near the installation edge, otherwise it will cause deformation of the parts.

[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, cooperate with 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 end face, and remove the remaining thickness on the inner ring surface and the outer ring surface on the basis of turning 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 rough material are machined to the second axial end.

[0045] 4) Heat treatment:

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

[0047] 5) Car benchmark:

[0048] like Figure 5 , through the axial second end of the annular raw material positioning, press the inner ring groove of the mounting edge and the outer peripheral surface radially close to the axial second end, the end face of the end where the mounting edge is located ( Figure 5 The upper end of the ring, that is, the axial first end face of the annular raw material, is repaired 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 product of the 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 at the final cutting of 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 of the thin-walled ring has poor flatness after cutting, which leads to the wall thickness size cannot be guaranteed when finishing the end face and the outer circle, and the outer diameter size is also easily out of tolerance due to part deformation. According to this process route and processing method, the tolerance rate is 100%.

[0051] like Figure 7 The combined cutting method is adopted, that is, radial cutting first and then axial cutting. The axial first end face of the annular raw material is used as the positioning surface, the inner ring groove at the installation edge is pressed axially, and the inner ring surface close to the axial first end and the inner ring groove is pressed radially, and then the inner ring surface is cut according to the radial direction. Figure 7 The sequential processing of ①, ②, ③, and ④, that is, first, the outer ring surface is precision turned, and then an outer ring groove is turned on the outer ring surface. The distance between the bottom of the outer ring groove and the inner ring surface is D. It is no longer a single radial cutting, but the final cutting is achieved by axial turning the intersection of the inner ring surface and the outer ring groove. This method changes the traditional cutting method and can ensure 100% qualified wall thickness dimensions.

[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 status 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 Fig.10 The special fixture shown is used for limiting, so that the ultra-thin titanium alloy adjustment ring can be ground on the two end faces 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 Fig.10 As shown, it includes four arc plates with a length of 1 / 4 of the circumference. The four arc plates are spliced ​​into a ring with a small gap at the splicing. The inner diameter of the spliced ​​ring is equal to the outer diameter of the adjustment ring. The thickness H = the thickness of the adjustment ring L-0.25. The fixture is made of strong magnetic material to ensure that it can be firmly adsorbed on the workbench of the grinder.

[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 Fig. 9 , ensuring 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: Fig.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 and bumps on the surface of the adjusting ring, and check the batch number of the parts.

[0063] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in the field. Although the illustrative specific embodiments of the present invention are described above to facilitate the understanding of the present invention by the technical personnel in the field, it should be clear that the present invention is not limited to the scope of the specific embodiments. For the ordinary technical personnel in the field, as long as various changes are within the spirit and scope of the present invention defined and determined by the attached claims, these changes are obvious, and all inventions and creations using the concept 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, selecting a ring part as the raw material; S2, turning the installation edge, moving the tool from the first axial end to the second axial end of the annular blank, turning a distance between the inner ring surface and the outer ring surface of the annular blank as the installation edge, and turning an inner ring groove on the turned inner ring surface at a position close to the end surface of the first axial end of the annular blank. During turning and clamping, only clamp the annular blank at the second axial end, and radial clamping near the installation edge of the annular blank is not allowed; S3, turning the remaining parts of the inner ring surface and the outer ring surface of the annular blank until reaching the axial second end of the annular blank, and 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 axial first end face of the annular rough material to repair the datum, and obtaining a datum surface with a flatness that meets the requirements; S6, finish turning the outer circle and cutting to obtain the adjustment ring, press the inner ring groove of the mounting edge, first finish turning the axial second end face of the annular blank, then finish turning the outer ring surface of the annular blank from the axial second end toward the axial first end, then cut an outer ring groove from the finished 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, cut along the axial direction of the annular blank until it intersects with the outer ring groove and completes the cutting, and the part falling from the annular blank is a semi-finished adjustment ring; S7, repeat S6, cutting off a piece of annular rough 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 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 adjustment ring.

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

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 a circle 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 step-shaped, and the thickness of the axial cross section decreases step by step from the inside to the outside 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 rough material is used as the positioning surface to press the inner ring groove at the installation 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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