Part wear depth accurate detection method in aero-engine factory return fault detection and repair process

Abstract

The invention discloses a method for accurately detecting the wear depth of a part in the factory return fault detection and repair process of an aero-engine, and the method comprises the steps: enabling a measurement instrument and a to-be-detected part to reach the internal temperature of a measurement place before measurement, cleaning the to-be-detected part, carrying out the rough measurement of the wear shape and depth through a sample paste making method, and carrying out the measurement. A to-be-measured part is placed and fixed on the platform according to different measurement objects, the gauge pressing amount and the datum plane or the datum line are determined according to the different measurement objects, and finally the abrasion depth is accurately measured. Visual inspection is adopted, the abrasion depth or the proofing paste projection measurement result is judged through the experience of an inspector to serve as a rough measurement value, a corresponding reachable dial indicator or dial indicator probe is manufactured according to the abrasion shape, a to-be-measured part is fixed to a working platform, and it is ensured that a measurement datum plane or datum line is parallel to the platform; the abrasion depth can be accurately measured by stably sliding the dial indicator or the dial indicator frame, and the abrasion depth is used as the zero part with abrasion, and the component can be continuously used.

Description

Technical Field

[0001] The invention relates to a method for accurately detecting the maximum value of wear depth of parts during the process of returning an aero-engine to a factory for fault inspection and repair, and belongs to the technical field of engine fault inspection and repair. Background Art

[0002] When an aircraft engine fails during use or reaches the end of its service life, it needs to be returned to the factory for disassembly and inspection. During the use of the engine, the surface of the parts will be worn and scratched; the surface coating will peel off and wear. According to the engine fault inspection and repair requirements, accurately detecting the maximum wear depth of the part surface is the only basis for judging whether the part can continue to be used, such as: the sealing component can continue to be used if the wear depth is no more than 0.3mm; the nozzle contact surface can continue to be used if the wear depth is no more than 0.2mm; the groove surface can continue to be used if the wear depth is no more than 0.1mm; the sealing surface of the turbine support casing can continue to be used if the annular wear depth is no more than 0.05mm; the wear depth of the wear-resistant bushing surface can continue to be used if the wear depth is no more than 0.02mm; the sealing ring can continue to be used if the wear depth is no more than 0.01mm.

[0003] Due to the different shapes of wear, such as grooves, pits, spots, edge defects and other irregular shapes, it is difficult to accurately measure the wear depth, which seriously affects the cost and quality of engine repair. Summary of the invention

[0004] In view of the problems described in the background technology, the present invention aims to provide a method for accurately detecting the wear amount of parts during the repair process of aircraft engines returned to the factory, and accurately measuring the wear depth of various irregular shapes on the parts.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A method for accurately detecting the wear depth of parts during the repair of aircraft engines returned to the factory for inspection, comprising: Step 1: The internal temperature of the measuring place is controlled at 15℃~25℃. Before measuring, the measuring instrument and the parts to be measured should reach the internal temperature of the measuring place; Step 2, cleaning the parts to be tested, including removing carbon deposits; Step 3: Roughly measure the wear shape and depth. Roughly measure the deepest wear depth and wear shape of the parts by using the proofing paste method. Step 4: According to the deepest depth and shape of the wear, a dial indicator or micrometer probe is selected or made for measurement, wherein the head of the probe is a spherical surface, and the radius of the spherical surface is less than or equal to the radius of curvature of the wear portion; Step 5: Place and fix the part to be measured on the platform. There are three placement and fixation methods according to the different measurement objects: Measure the wear depth on the end face of the part: Place the part on the platform, and measure the pressure gauge at any three points of the wear-free area around the wear area by translating the table frame on the platform to make sure that the pressure gauge is consistent. Use auxiliary tools to fix the part to ensure that the end face to be measured is parallel to the working platform. Measure the wear depth on the inner surface of the part, where the inner surface is a cylindrical surface or a conical surface: place the part on the platform, and measure the pressure gauge at each point on both sides of the same busbar where there is wear by translating the table stand on the platform. Use auxiliary tools to fix the part to ensure that the busbar on the inner surface to be measured is parallel to the working platform. Measure the wear depth on the outer cylindrical surface of the part, where the outer cylindrical surface is a cylindrical surface or a conical surface: place the part on the platform, and measure the pressure gauge value of each point on both sides of the same busbar where there is wear by translating the table frame on the platform. Use auxiliary tools to fix the part to ensure that the busbar on the outer cylindrical surface to be measured is parallel to the working platform; Step 6: Determine the pressure gauge and reference surface or reference line. There are three processing methods according to the different measurement objects: Measure the wear depth on the end face of the part: After the part to be measured is fixed on the platform and the plane with wear is parallel to the platform, press the probe of the dial indicator or micrometer vertically on the unworn part of the plane, adjust the pressure of the dial indicator or micrometer by adjusting the position of the dial indicator or micrometer on the table stand, and rotate the dial indicator or micrometer until the pointer is aligned with the 0 scale; slide the table stand smoothly on the platform to press the probe of the dial indicator or micrometer on the worn part, and read the wear depth through the pointer of the dial indicator or micrometer; Measure the wear depth on the inner surface of the part, where the inner surface is a cylindrical surface or a conical surface: after the part to be measured is fixed on the platform and the generatrix on the inner surface with wear is parallel to the working platform, slide the table frame steadily on the platform, find the generatrix at the lowest point as the reference line, press the probe of the dial indicator or micrometer vertically on the unworn part of the reference line, adjust the pressure of the dial indicator or micrometer by adjusting the position of the dial indicator or micrometer on the table frame, and rotate the dial indicator or micrometer until the pointer is aligned with the 0 scale; slide the table frame steadily on the platform, press the probe of the dial indicator or micrometer on the worn part, and read the wear depth through the pointer of the dial indicator or micrometer; Measure the wear depth on the outer cylindrical surface of the part, where the outer cylindrical surface is a cylindrical surface or a conical surface: after the part to be measured is fixed on the platform and the generatrix on the outer cylindrical surface with wear is parallel to the working platform, slide the table stand steadily on the platform, find the generatrix at the highest point as the reference line, press the probe of the dial indicator or micrometer vertically on the unworn part of the reference line, adjust the pressure of the dial indicator or micrometer by adjusting the position of the dial indicator or micrometer on the table stand, rotate the dial indicator or micrometer until the pointer is aligned with the 0 scale; slide the table stand steadily on the platform, press the probe of the dial indicator or micrometer on the worn part, and read the wear depth by the pointer of the dial indicator or micrometer.

[0006] As a solution, in step 4, the measuring needle is ground to the required shape and length using a conventional conical measuring needle.

[0007] As a solution, in step six, When measuring the wear depth on the end face of a part, in order to avoid scratching the surface of the part, the pressure gauge is 0.1mm larger than the rough measurement value; When measuring the wear depth on the inner surface of a part, in order to avoid scratching the surface of the part, the pressure gauge should be 0.1mm larger than the rough measurement value; When measuring the wear depth on the outer cylindrical surface of a part, in order to avoid scratching the surface of the part, the pressure gauge should be 0.1mm larger than the rough measurement value.

[0008] As a solution, in step six, When measuring the wear depth on the inner surface of a part, observe the state of the dial indicator while the table stand is sliding steadily on the platform. The dial indicator is not allowed to move relative to the table stand. When measuring the wear depth on the outer cylindrical surface of a part, observe the status of the dial indicator simultaneously while the meter stand is sliding steadily on the platform. The dial indicator is not allowed to move relative to the meter stand.

[0009] In order to measure the wear depth of parts during the inspection and repair of aircraft engines, the existing technology usually adopts visual inspection and judges the wear depth based on the experience of the inspector. This measurement method relies heavily on the ability and experience of the inspector and has the risk of inaccurate judgment. For wear depth with a relatively regular shape and a large depth, the wear depth is measured by the proofing paste method. The sample paste is sliced ​​and then enlarged on a projector for measurement. The biggest problem with this measurement method is that it is difficult to ensure that the selected section during slicing is consistent with the reference plane or reference line for wear depth measurement, resulting in large measurement errors, which seriously affects the cost and quality of engine repair.

[0010] The present invention adopts visual inspection, judgement of wear depth through inspector's experience or measurement result of projection of proofing paste as rough measurement value, makes corresponding reachable dial indicator or micrometer probe according to wear shape, fixes the part to be measured on the working platform and ensures that the measuring reference plane or reference line is parallel to the platform, and accurately measures the wear depth by smoothly sliding dial indicator or micrometer stand, which serves as the basis for whether the worn parts and components can continue to be used. DETAILED DESCRIPTION

[0011] 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.

[0012] A method for accurately detecting the wear amount of parts during the repair of an aircraft engine, comprising the following steps: Step 1: The internal temperature of the measurement site is 15℃~25℃. Before measurement, the measuring instrument and the measured parts and components should reach the room temperature.

[0013] Step 2: The parts and components to be tested should be free of carbon deposits and cleaned carefully.

[0014] Step 3: Rough measurement of wear shape and depth. Roughly measure the deepest depth and wear shape of the wear by using the proofing paste method.

[0015] Step 4: According to the deepest depth and shape of wear, select or make a dial indicator or micrometer probe for measurement. The head of the probe is a spherical surface, and the radius of the spherical surface is less than or equal to the curvature radius of the wear part. The probe is ground to the required shape and length using a conventional conical probe.

[0016] Step 5: The method of placing and fixing the parts to be tested on the platform is as follows: Measure the wear depth on the end face of the part: Place the part on the platform, and measure the pressure gauge at any three points of the wear-free area around the wear area by translating the table frame on the platform to make sure that the pressure gauge is consistent. Use auxiliary tools to fix the part to ensure that the end face to be measured is parallel to the working platform. Measure the wear depth on the inner circle (cylindrical or conical) surface of the part: Place the part on the platform, and measure the pressure gauge at each point on both sides of the same busbar where there is wear by translating the meter stand on the platform. Use auxiliary tools to fix the part to ensure that the busbar on the inner circle surface to be measured is parallel to the working platform. Measure the wear depth on the outer circle (cylindrical or conical) surface of the part: Place the part on the platform, and measure the pressure gauge value of each point on both sides of the same busbar where there is wear by translating the table frame on the platform. Use auxiliary tools to fix the part to ensure that the busbar on the outer circle to be measured is parallel to the working platform.

[0017] Step 6: Determine the pressure gauge and the reference surface or reference line. In this embodiment, a dial gauge is used as an example: Measure the wear depth on the end face of the part: After the part to be measured is fixed on the platform, the plane with wear is parallel to the platform. The needle of the dial indicator is pressed vertically on the unworn part of the plane. The pressure of the dial indicator is adjusted by adjusting the position of the dial indicator on the table frame. To avoid scratching the surface of the part, the pressure should be as small as possible (usually 0.1mm larger than the rough measurement value). Rotate the dial indicator until the pointer is aligned with the scale "0". Slide the table frame smoothly on the platform (carefully observe the state of the dial indicator during the sliding process, and the dial indicator is not allowed to change relative to the table frame), so that the needle of the dial indicator is pressed on the worn part, and the wear depth is read by the pointer of the dial indicator.

[0018] Measure the wear depth on the inner circle (cylindrical or conical) surface of the part: After the part to be measured is fixed on the platform, the generatrix on the inner circle surface with wear is parallel to the working platform. Slide the table frame steadily on the platform (carefully observe the state of the dial indicator during the sliding process, and the dial indicator is not allowed to change relative to the table frame) to find the generatrix at the lowest point as the reference line, and the probe of the dial indicator is vertically pressed on the unworn part of the reference line. Adjust the pressure of the dial indicator by adjusting the position of the dial indicator on the table frame. The pressure should be as small as possible (usually 0.1mm larger than the rough measurement value), and rotate the dial indicator until the pointer is aligned with the scale "0". Slide the table frame steadily on the platform (carefully observe the state of the dial indicator during the sliding process, and the dial indicator is not allowed to change relative to the table frame) so that the probe of the dial indicator is pressed on the worn part, and read the wear depth through the pointer of the dial indicator.

[0019] Measure the wear depth on the outer circle (cylindrical or conical) surface of the part: After the part to be measured is fixed on the platform, the generatrix on the outer circle with wear is parallel to the working platform. Slide the table frame steadily on the platform (carefully observe the state of the dial indicator during the sliding process, and the dial indicator is not allowed to change relative to the table frame) to find the generatrix at the highest point as the reference line, and the probe of the dial indicator is vertically pressed on the unworn part of the reference line. Adjust the pressure of the dial indicator by adjusting the position of the dial indicator on the table frame. The pressure should be as small as possible (usually 0.1mm larger than the rough measurement value), and rotate the dial indicator until the pointer is aligned with the scale "0". Slide the table frame steadily on the platform (carefully observe the state of the dial indicator during the sliding process, and the dial indicator is not allowed to change relative to the table frame) so that the probe of the dial indicator is pressed on the worn part, and the wear depth is read by the pointer of the dial indicator.

[0020] 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 ordinary technicians in the field of this technology, 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 accurately detecting the wear depth of parts during the inspection and repair of aircraft engines, characterized in that: include: Step 1: The internal temperature of the measuring place is controlled at 15℃~25℃. Before measuring, the measuring instrument and the parts to be measured should reach the internal temperature of the measuring place; Step 2, cleaning the parts to be tested, including removing carbon deposits; Step 3: Roughly measure the wear shape and depth. Roughly measure the deepest wear depth and wear shape of the parts by using the proofing paste method. Step 4: According to the deepest depth and shape of the wear, a dial indicator or micrometer probe is selected or made for measurement, wherein the head of the probe is a spherical surface, and the radius of the spherical surface is less than or equal to the radius of curvature of the wear portion; Step 5: Place and fix the part to be measured on the platform. There are three placement and fixation methods according to the different measurement objects: Measure the wear depth on the end face of the part: Place the part on the platform, and measure the pressure gauge at any three points of the wear-free area around the wear area by translating the table frame on the platform to make sure that the pressure gauge is consistent. Use auxiliary tools to fix the part to ensure that the end face to be measured is parallel to the working platform. Measure the wear depth on the inner surface of the part, where the inner surface is a cylindrical surface or a conical surface: place the part on the platform, and measure the pressure gauge at each point on both sides of the same busbar where there is wear by translating the table stand on the platform. Use auxiliary tools to fix the part to ensure that the busbar on the inner surface to be measured is parallel to the working platform. Measure the wear depth on the outer cylindrical surface of the part, where the outer cylindrical surface is a cylindrical surface or a conical surface: place the part on the platform, and measure the pressure gauge value of each point on both sides of the same busbar where there is wear by translating the table frame on the platform. Use auxiliary tools to fix the part to ensure that the busbar on the outer cylindrical surface to be measured is parallel to the working platform; Step 6: Determine the pressure gauge and the reference surface or reference line. There are three processing methods according to the different measurement objects: Measure the wear depth on the end face of the part: After the part to be measured is fixed on the platform and the plane with wear is parallel to the platform, press the probe of the dial indicator or micrometer vertically on the unworn part of the plane, adjust the pressure of the dial indicator or micrometer by adjusting the position of the dial indicator or micrometer on the table stand, and rotate the dial indicator or micrometer until the pointer is aligned with the 0 scale; slide the table stand smoothly on the platform to press the probe of the dial indicator or micrometer on the worn part, and read the wear depth through the pointer of the dial indicator or micrometer; Measure the wear depth on the inner surface of the part, where the inner surface is a cylindrical surface or a conical surface: after the part to be measured is fixed on the platform and the generatrix on the inner surface with wear is parallel to the working platform, slide the table frame steadily on the platform, find the generatrix at the lowest point as the reference line, press the probe of the dial indicator or micrometer vertically on the unworn part of the reference line, adjust the pressure of the dial indicator or micrometer by adjusting the position of the dial indicator or micrometer on the table frame, and rotate the dial indicator or micrometer until the pointer is aligned with the 0 scale; slide the table frame steadily on the platform, press the probe of the dial indicator or micrometer on the worn part, and read the wear depth through the pointer of the dial indicator or micrometer; Measure the wear depth on the outer cylindrical surface of the part, where the outer cylindrical surface is a cylindrical surface or a conical surface: after the part to be measured is fixed on the platform and the generatrix on the outer cylindrical surface with wear is parallel to the working platform, slide the table stand steadily on the platform, find the generatrix at the highest point as the reference line, press the probe of the dial indicator or micrometer vertically on the unworn part of the reference line, adjust the pressure of the dial indicator or micrometer by adjusting the position of the dial indicator or micrometer on the table stand, rotate the dial indicator or micrometer until the pointer is aligned with the 0 scale; slide the table stand steadily on the platform, press the probe of the dial indicator or micrometer on the worn part, and read the wear depth by the pointer of the dial indicator or micrometer.

2. The method for accurately detecting the wear depth of parts during the repair of an aircraft engine returned to the factory according to claim 1 is characterized by: In the step 4, the measuring needle is ground to the required shape and length using a conventional conical measuring needle.

3. The method for accurately detecting the wear depth of parts during the repair of an aircraft engine returned to the factory according to claim 1 is characterized by: In the step six, When measuring the wear depth on the end face of a part, in order to avoid scratching the surface of the part, the pressure gauge is 0.1mm larger than the rough measurement value; When measuring the wear depth on the inner surface of a part, in order to avoid scratching the surface of the part, the pressure gauge should be 0.1mm larger than the rough measurement value; When measuring the wear depth on the outer cylindrical surface of a part, in order to avoid scratching the surface of the part, the pressure gauge should be 0.1mm larger than the rough measurement value.

4. The method for accurately detecting the wear depth of parts during the repair of an aircraft engine returned to the factory according to claim 1 is characterized by: In the step six, When measuring the wear depth on the inner surface of a part, observe the state of the dial indicator while the table stand is sliding steadily on the platform. The dial indicator is not allowed to move relative to the table stand. When measuring the wear depth on the outer cylindrical surface of a part, observe the status of the dial indicator simultaneously while the meter stand is sliding steadily on the platform. The dial indicator is not allowed to move relative to the meter stand.