Method for repairing reference of roughing transformer after deformation

Abstract

The application provides a method for repairing reference after rough machining deformation of a rectifier, which reduces or even eliminates the influence caused by deformation by re-repairing the reference, and provides a good machining state for subsequent finish machining. The method comprises the following steps: repairing an air inlet side reference; repairing an air inlet side reference; measuring a blade allowance; repairing the air inlet side reference; machining and removing the allowance of an air inlet side outer ring according to the obtained reference surface machining allowance; and repairing the air outlet side reference.

Description

Technical Field

[0001] This invention relates to the field of aero-engine rectifier processing technology, specifically a method for repairing the reference datum after rough machining deformation of the rectifier. Background Technology

[0002] The rectifier is the most critical core stator component in an aero-engine. Its function is to slow down and diffuse the airflow within a channel that expands along the flow direction, and to adjust the airflow direction. The shape and structure of the rectifier can be referenced... Figure 6 It includes an outer ring, an inner ring, and blades located between the outer and inner rings. The rectifier can be manufactured by integral machining, which includes rough machining, heat treatment, and finish machining. However, after rough machining (and heat treatment), the rectifier will deform, which will affect the subsequent finish machining steps and cause it to fail to meet the design requirements. Therefore, a method is needed to mitigate or even eliminate the impact of deformation after rough machining. Summary of the Invention

[0003] To address the issue of how to mitigate or even eliminate the impact of rough machining deformation, this invention provides a method for repairing the datum after rough machining deformation of a rectifier. This method mitigates or even eliminates the impact of deformation by re-repairing the datum and provides a good machining condition for subsequent finishing.

[0004] The technical solution is as follows: a method for repairing the reference datum after rough machining deformation of a rectifier, characterized by comprising the following steps: 1. Repair the outlet side reference; use the outer ring end face of the inlet side as the positioning reference surface and press the outer ring of the inlet side. Before pressing, use a dial indicator to measure the outer ring end face of the outlet side. The surface change before and after pressing should not be greater than 0.02mm. After pressing, process the outer ring end face of the outlet side to ensure that the flatness is within 0.03mm. 2. Repair the intake side reference; use the exhaust side outer ring end face as the positioning reference surface and press the exhaust side outer ring. Before pressing, use a dial indicator to measure the intake side outer ring end face. The surface change before and after pressing should not be greater than 0.01mm. Then process the intake side outer ring end face to ensure the flatness is within 0.03mm. 3. Measure the blade allowance; using the outer ring reference surface on the intake side as the measurement reference surface, select the blade to measure the leading edge and trailing edge allowances, and then determine the machining allowance of the reference surface: When the leading edge allowance is greater than the trailing edge allowance, the machining allowance of the intake side outer ring reference surface = X - X1 - △; △ = (leading edge allowance - trailing edge allowance) ÷ 2; When the leading edge allowance is less than the trailing edge allowance, the machining allowance of the intake side outer ring reference surface = X - X1 + △; △ = (trailing edge allowance - leading edge allowance) ÷ 2; Where X is the longitudinal distance from the stacking shaft to the reference plane of the outer ring on the intake side; X1 is the theoretical value of X marked in the design drawing; 4. Refine the intake side reference; Based on the machining allowance of the reference surface obtained in step 3, machine the intake side outer ring and remove the allowance. At the same time, refine the intake side of the workpiece according to the machining dimensions to form the intake side reference for subsequent machining. Before pressing the rectifier, use a dial indicator to measure the end face of the intake side outer ring. The surface change before and after pressing should not be greater than 0.01mm. 5. Fine-tune the exhaust side reference: Using the machined intake side plane as the reference plane, after clamping and pressing the workpiece, fine-tune the exhaust side of the workpiece to form an exhaust side reference for subsequent machining. Before pressing the rectifier, use a dial indicator to measure the surface change before and after pressing. The surface change before and after pressing should not exceed 0.01mm.

[0005] Furthermore, in step 2, the height of the outer ring end face on the intake side is measured before processing, and the highest and lowest points are marked; in step 3, four blades are selected respectively based on the highest and lowest points and their relative positions obtained in step 2 for margin measurement. The leading edge margin in step 3 is the minimum value among the four leading edge margins, and the trailing edge margin is the minimum value among the four trailing edge margins.

[0006] Furthermore, the leading edge margin and trailing edge margin of each blade are the minimum values ​​among multiple points evenly distributed from the inner flow channel to the outer flow channel.

[0007] Furthermore, in step 1, the suspended virtual point position of the outer ring end face of the air intake side, which serves as the positioning reference surface, is shimmed with a feeler gauge. During machining, the tool is aligned at the low point, and the high point on the air outlet side is machined off.

[0008] Furthermore, in step 2, the suspended virtual point position of the outer ring end face of the air outlet side, which serves as the positioning reference surface, is shimmed with a feeler gauge. During machining, the tool is aligned at the low point, and the high point on the air inlet side is machined off.

[0009] Furthermore, in steps 4 and 5, when finishing the workpiece, the end face is machined first with a certain allowance, then the side face is machined until the final size is achieved, and finally the end face is machined again to eliminate the allowance.

[0010] Beneficial effects: By using the above steps to repair the datum of the rectifier that has been deformed after rough machining (and heat treatment), subsequent machining can be positioned using the corrected datum, which can effectively reduce or even eliminate the effects of deformation, allowing the parts to be machined stably and with high quality. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the processing in step 1; Figure 2 This is a schematic diagram of the processing in step 2; Figure 3 This is a schematic diagram showing the positions of the stacking shaft and the intake-side outer ring reference plane. Figure 4 This is a schematic diagram of the processing in step 4; Figure 5 This is a schematic diagram of the processing in step 5; Figure 6 This is a schematic diagram of a rectifier. Detailed Implementation

[0012] A method for repairing the reference datum after rough machining deformation of a rectifier, comprising the following steps: 1. As... Figure 1 The exhaust side reference is shown; the intake side outer ring end face is used as the positioning reference surface and the intake side outer ring 1 is pressed tightly. Because the flatness of the intake side is not good, the solid point is pressed before processing, and the suspended virtual point position is shimmed with a feeler gauge. When pressing the pressure plate, the end face will not deform and sink. It is required to use a dial indicator to measure the exhaust side outer ring end face before pressing. The surface change before and after pressing should not be greater than 0.02mm. After pressing, the exhaust side outer ring end face 2 is processed (the thickened part of the part in the figure is the processing position) to ensure that the flatness is within 0.03mm. When processing, the low point is set and the high point of the exhaust side is processed off.

[0013] 2. For example Figure 2 The reference surface for the intake side is shown. The outer ring end face 2 of the exhaust side is used as the positioning reference surface and the outer ring of the exhaust side is pressed. Before pressing, a dial indicator is used to measure the end face of the outer ring 1 of the intake side. The surface change before and after pressing is no more than 0.01mm. At the same time, the machine tool marks the high and low points of the end face and their relative positions at four points before pressing. Then, following the method in step 1, a feeler gauge is used to shim and the end face of the outer ring of the intake side is machined to ensure that the flatness is within 0.03mm.

[0014] 3. For example Figure 3 The blade allowance shown is measured as follows: the blade is measured according to the theoretical distance (including allowance) from the theoretical reference plane to the blade stacking axis; the reference plane B on the outer ring of the intake side is used as the measurement reference plane, and the leading edge and trailing edge allowances of the blade are selected for measurement, and then the machining allowance of the reference plane is determined: When the leading edge allowance is greater than the trailing edge allowance, the machining allowance of the intake side outer ring reference surface = X - X1 - △; △ = (leading edge allowance - trailing edge allowance) ÷ 2; When the leading edge allowance is less than the trailing edge allowance, the machining allowance of the intake side outer ring reference surface = X - X1 + △; △ = (trailing edge allowance - leading edge allowance) ÷ 2; The blade selection process involves selecting four blades based on the highest and lowest points obtained in step 2, along with their relative positions, for margin measurement. The leading and trailing margins of each blade are the minimum values ​​among multiple points evenly distributed from the inner flow channel to the outer flow channel. The final determined leading margin is the minimum of the leading margins of the four blades, and the final determined trailing margin is the minimum of the trailing margins of the four blades. Figure 3 X is the longitudinal distance from the stacking axis (L) to the reference plane B of the outer ring on the intake side; X1 is the theoretical value of X marked in the design drawing. The units of the above parameters can all be millimeters.

[0015] 4. For example Figure 4 The intake side reference is shown. Based on the machining allowance of the reference surface obtained in step 3, the intake side outer ring is machined and the allowance is removed. The position of the blade stacking axis is controlled by removing the allowance, and the position of the stacking axis is changed to make the allowance on both sides of the front and rear edges uniform, so as to reduce or even eliminate the influence of deformation. At the same time, the intake side of the workpiece is refined according to the machining dimensions to form the intake side reference for subsequent machining reference. Before the rectifier is pressed, the end face of the intake side outer ring is measured with a dial indicator. The surface change before and after pressing is no more than 0.01mm. During machining, a 0.2mm allowance can be left to machine the positioning end face first, and then the side 3 is machined to the final size of this process according to the diameter requirement. Finally, the positioning end face is machined to the allowance. For example, a large amount can be turned first, and the end face can be finished to ensure that the flatness of the end face meets the requirements.

[0016] 5. For example Figure 5 The exhaust side reference is shown. Using the machined intake side plane as the reference surface, after clamping and pressing the workpiece, the exhaust side of the workpiece is machined to form the exhaust side reference for subsequent machining. Before pressing the rectifier, a dial indicator is used to measure the outer ring end face of the exhaust side. The surface change before and after pressing is no more than 0.01mm. During machining, refer to step 4 to first leave a 0.2mm allowance to machine the positioning end face, then machine the side according to the diameter requirement to the final size of this process, and finally machine the positioning end face to the required size.

[0017] The above control points are all points to note when machining rectifiers. With the aim of eliminating the influence of deformation, new machining methods have been developed to solve the problem of large deformation of the ring body after rough machining and heat treatment. This will provide a good machining state for the precision milling blades, enabling parts to be machined stably and with high quality.

[0018] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for repairing the reference datum after rough machining deformation of a rectifier, characterized in that, It includes the following steps:

1. Repair the outlet side reference; use the outer ring end face of the inlet side as the positioning reference surface and press the outer ring of the inlet side. Before pressing, use a dial indicator to measure the outer ring end face of the outlet side. The surface change before and after pressing should not be greater than 0.02mm. After pressing, process the outer ring end face of the outlet side to ensure that the flatness is within 0.03mm. In step 1, the suspended virtual point position of the outer ring end face of the air intake side, which serves as the positioning reference surface, is shimmed with a feeler gauge. During machining, the tool is aligned at the low point, and the high point on the air outlet side is machined off.

2. Repair the intake side reference; use the exhaust side outer ring end face as the positioning reference surface and press the exhaust side outer ring. Before pressing, use a dial indicator to measure the intake side outer ring end face. The surface change before and after pressing should not be greater than 0.01mm. Then process the intake side outer ring end face to ensure the flatness is within 0.03mm. In step 2, the suspended virtual point position of the outer ring end face of the air outlet side, which serves as the positioning reference surface, is shimmed with a feeler gauge. During machining, the tool is aligned at the low point, and the high point on the air inlet side is machined off.

3. Measure the blade allowance; using the outer ring reference surface on the intake side as the measurement reference surface, select the blade to measure the leading edge and trailing edge allowances, and then determine the machining allowance of the reference surface: When the leading edge allowance is greater than the trailing edge allowance, the machining allowance of the intake side outer ring reference surface = X - X1 - △; △ = (leading edge allowance - trailing edge allowance) ÷ 2; When the leading edge allowance is less than the trailing edge allowance, the machining allowance of the intake side outer ring reference surface = X - X1 + △; △ = (trailing edge allowance - leading edge allowance) ÷ 2; Where X is the longitudinal distance from the stacking shaft to the reference plane of the outer ring on the intake side; X1 is the theoretical value of X marked in the design drawing; In step 2, before processing, measure the height of the outer ring end face on the intake side and mark the highest and lowest points; in step 3, based on the highest and lowest points obtained in step 2 and their relative positions, select four blades respectively for margin measurement. The leading edge margin in step 3 is the minimum value among the four leading edge margins, and the trailing edge margin is the minimum value among the four trailing edge margins.

4. Refine the intake side reference; Based on the machining allowance of the reference surface obtained in step 3, machine the intake side outer ring and remove the allowance. At the same time, refine the intake side of the workpiece according to the machining dimensions to form the intake side reference for subsequent machining. Before pressing the rectifier, use a dial indicator to measure the end face of the intake side outer ring. The surface change before and after pressing should not be greater than 0.01mm.

5. Fine-tune the exhaust side reference: Using the machined intake side plane as the reference plane, after clamping and pressing the workpiece, fine-tune the exhaust side of the workpiece to form an exhaust side reference for subsequent machining. Before pressing the rectifier, use a dial indicator to measure the surface change before and after pressing. The surface change before and after pressing should not exceed 0.01mm.

2. The method for repairing the reference datum after rough machining deformation of a rectifier according to claim 1, characterized in that: The leading edge margin and trailing edge margin of each blade are the minimum values ​​among multiple points evenly distributed from the inner flow channel to the outer flow channel.

3. The method for repairing the reference datum after rough machining deformation of a rectifier according to claim 1, characterized in that: In steps 4 and 5, when finishing the workpiece, first process the end face and leave a certain allowance, then process the side face until the final size, and finally process the end face again to eliminate the allowance.

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