Repairing process method for moving ring parts of gas turbine

Abstract

The invention aims to provide a process method for repairing moving ring parts of a gas turbine, and belongs to the field of gas turbines. Comprising the following steps: (1) grinding and polishing; (2) inspecting; (3) fine grinding; (4) cleaning; (5) inspecting; (6) laser engraving and milling; (7) secondary processing; (8) inspecting; and (9) warehousing. The processing period is greatly shortened, the number of finished products is reduced, and good economic benefits can be created.

Description

Technical Field

[0001] The present invention relates to a method for repairing a gas turbine, specifically a method for repairing moving ring parts. Background Art

[0002] As an advanced and complex complete set of power machinery equipment, the development level of gas turbines is one of the important symbols of a country's high-tech capabilities and scientific and technological strength, with outstanding strategic significance. With the continuous development of the localization process of gas turbines in China, precision machining technology has become one of the key factors restricting the stable operation of the entire gas turbine, the improvement of engine performance, and the reduction of fuel consumption rate. Moving ring parts are important parts of each component in the assembly of gas turbines and cooperate with graphite rings. They bear the important functions of the dynamic and static transition and oil and gas sealing of gas turbines. The workpiece design accuracy is extremely high and the manufacturing process is complex. Machining and manufacturing are typical precision machining. Among them, a circle of flag-shaped oil film shallow grooves with a depth of 0.018 mm and a tolerance of 0.0045 mm is machined at a specified position on the ultra-precision plated end face with a flatness of 0.001 mm and a surface roughness of 0.04. This technology has always been a processing difficulty in the industry, which results in a low finished product rate of parts.

[0003] The overhaul time of gas turbines is determined according to the operating environment and operating time, and intermediate maintenance is carried out approximately every 2-4 years. During the disassembly process of gas turbines, moving ring parts are the top priority of inspection. During the long-term operation process, the moving ring and the graphite ring interact with each other, and wear appears on the surface of the moving ring. In the three-coordinate measurement, the flatness and the size of the flag-shaped groove change and do not meet the installation requirements. It is necessary to replace a new moving ring. The machining of moving rings belongs to difficult-to-machine parts, and the cycle for machining one finished product is long and the cost is high, which affects the reinstallation progress of gas turbines. The process route from blank to finished product is as Figure 1 shown. Summary of the Invention

[0004] The purpose of the present invention is to provide a repair process method for moving ring parts of a gas turbine that can reach the installable state.

[0005] The purpose of the present invention is achieved as follows:

[0006] The present invention includes the following steps:

[0007] (1) Grinding and polishing;

[0008] (2) Inspection;

[0009] (3) Fine grinding;

[0010] (4) Cleaning;

[0011] (5) Inspection;

[0012] (6) Laser engraving and milling;

[0013] (7) Secondary processing;

[0014] (8) Inspection;

[0015] (9) Storage in warehouse.

[0016] The present invention may further include:

[0017] 1. For the grinding and polishing in step (1), select 3000# diamond grinding sand, stir it evenly with water, add it into the grinding and polishing machine, and put the dynamic ring into the grinding machine; the rotation speed of the grinding machine workbench is 40 r / min, the grinding fluid flushes for 2 s every 30 s, and grind for 20 min to remove the residual graphite ring on the surface of the dynamic ring.

[0018] 2. For the inspection in step (2), the actual requirement for flatness detected by the coordinate measuring machine is 0.001 mm, and the actual requirement for the depth of the flag-shaped groove designed for the dynamic ring is 0.018 +0.0021 -0.0015 mm. Judge whether to continue using or repair according to the actual value; if repair is needed, measure the thickness of the chromium plating layer on the working surface of the dynamic ring, and the thickness requirement is within the range of 0.07 - 0.1 mm.

[0019] 3. For the fine grinding in step (3), use 0.25 KG of boron carbide powder with 1200 meshes, 200 ML of fully synthetic water-soluble cutting fluid, and fill the solution barrel with water to a volume of 0.009 m 3 Put the dynamic ring into the grinding machine, the rotation speed of the grinding machine workbench is 45 r / min, the grinding fluid flushes for 1 s every 35 s, and grind for 45 min; after grinding stops, wipe the surface of the dynamic ring, and use the interference method to check whether the flatness of the working surface of the dynamic ring on the optical flat is qualified; if not qualified, adjust the grinding machine workbench appropriately; in the process of adjusting the grinding machine workbench, when the ground surface of the part shows higher outside and lower inside, tighten the middle screw of the grinding disc, and the principle of the grinding platform grinding the workpiece is the male-female grinding; in the process of adjusting the grinding machine workbench, when the part shows higher outside and lower inside, the grinding platform shows lower outside and higher inside, tighten the screw to press down the grinding platform until the grinding is qualified.

[0020] 4. In step (4), cleaning is carried out to remove the grinding sand in the oil storage tank through ultrasonic cleaning.

[0021] 5. In step (5), inspection is carried out. After the parts are cleaned, the coordinate measuring machine inspects the actual values of the part dimensions, chromium plating layer thickness, flatness and flag-shaped groove depth.

[0022] 6. In the laser engraving and milling in step (6), place the part on the tooling and hold it up with a three-jaw chuck. Machine a window on a 0.3-mm-thick iron sheet with the same shape and size as the oil storage groove. Cover the moving ring with the iron sheet, align the window of the iron sheet with the oil storage groove of the moving ring, and run the marking program in single-segment mode to move the moving ring to the appropriate position according to the position of the flag-shaped groove; select a matching retaining hook according to the parts with different drawing numbers, and use a hot melt gun to stick the retaining hook to the part; place it in the tooling, and let the retaining hook lean against the limit rod on the tooling to check whether there is a gap between the retaining hook and the limit rod; the number of times of the first marking is less than 60, then select the marked pattern by window selection, and click on general planar marking in the next process.

[0023] 7. The secondary processing in step (7) means that if the dimensions are unqualified, reinstall the part for secondary processing: if the difference between the deepest groove and the shallowest groove in the measurement result is less than 0.003, obtain the marking depth for each time according to the number of times of the first marking / the average value of the deepest and shallowest in the measurement, and determine the number of marking times by calculating the value obtained by subtracting the average value from the final dimension; repeat the operations of selecting the marked pattern by window selection, clicking on general planar marking, and repeating the motor reset. After the motor reset, click start.

[0024] 8. The inspection in step (8) is to use a coordinate measuring machine to inspect the actual values of the part dimensions, flatness, and the depth of the flag-shaped groove.

[0025] The advantages of the present invention are as follows: The present invention greatly shortens the processing cycle, reduces the cost of finished products, and can create good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the process route diagram from blank to finished product by the traditional method;

[0027] Figure 2 is the flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present invention will be described in more detail with reference to the accompanying drawings as follows:

[0029] Combined with Figure 1-2 , a repair process method for a moving ring of a gas turbine according to the present invention includes the following steps:

[0030] Step 1: Grinding and polishing

[0031] Step 2: Inspection

[0032] Step 3: Fine grinding

[0033] Step 4: Cleaning

[0034] Step 5: Inspection

[0035] Step 6: Laser engraving and milling

[0036] Step 7: Secondary processing (selection)

[0037] Step 8: Inspection

[0038] Step 9: Warehousing

[0039] Step 1 Grinding and polishing. The working surface of the dynamic ring disassembled from the overhaul machine has been in contact with the graphite ring for a long time. Graphite ring residues adhere to the flag-shaped grooves on the surface of the dynamic ring, and neither alcohol wiping nor ultrasonic cleaning can completely remove them. 3000# diamond grinding sand and water are evenly stirred and added to the grinding and polishing machine, and the dynamic ring is placed in the grinding machine.

[0040] Step 1 Grinding and polishing. The rotational speed of the grinding machine workbench is 40 r / min, the grinding fluid flushes for 2 s every 30 s, and it is ground for 20 min to remove the graphite ring residues on the surface of the dynamic ring.

[0041] Step 2 Inspection. After grinding, the flatness is detected by a three-coordinate measuring instrument. The actual requirement for flatness is 0.001 mm and the depth of the flag-shaped groove.

[0042] Step 2 Inspection. The actual required depth of the flag-shaped groove designed for the dynamic ring is 0.018 +0.0021 -0.0015 mm. The actual value is obtained through measurement, and based on the actual value, it is determined whether to continue using or repair.

[0043] Step 2 Inspection. According to the actual value of the flag-shaped groove of the dynamic ring, if repair is required, the thickness of the chromium plating layer on the working surface of the dynamic ring needs to be measured, and the thickness requirement is within the range of 0.07 - 0.1 mm.

[0044] Step 3 Fine grinding. 0.25 KG of boron carbide powder with 1200 meshes, 200 ML of fully synthetic water-soluble cutting fluid, and water are added to fill a solution bucket with a volume of 0.009 m 3 The dynamic ring is placed in the grinding machine. The rotational speed of the grinding machine workbench is 45 r / min, the grinding fluid flushes for 1 s every 35 s, and it is ground for 45 min.

[0045] Step 3 Fine grinding. After grinding stops, wipe the surface of the dynamic ring, and use the interference method to check whether the flatness of the working surface of the dynamic ring on the optical flat is qualified.

[0046] Step 3 Fine grinding. If it is unqualified, appropriately adjust the grinding machine workbench.

[0047] Step 3 Fine grinding. In the process of adjusting the grinding machine workbench, when the ground surface of the part shows higher on the outside and lower on the inside, the middle screw of the grinding disc needs to be tightened. The principle of grinding the workpiece on the grinding platform is grinding with a male and female grinding pair.

[0048] Step 3 Fine grinding. In the process of adjusting the grinding machine workbench, when the part shows higher on the outside and lower on the inside, the grinding platform shows lower on the outside and higher on the inside. It is necessary to tighten the screw to press down the grinding platform until the grinding is qualified.

[0049] Step 4 Cleaning. Since it is a repaired dynamic seal ring and the oil storage groove on the surface of the dynamic seal ring has been machined, during the grinding process, a large amount of grinding sand is in the oil storage groove. Ultrasonic cleaning is required to remove the grinding sand in the oil storage groove.

[0050] Step 5 Inspection. After the parts are cleaned, a three-coordinate measuring machine is used to inspect the actual values of the part dimensions, chromium plating layer thickness, flatness, and flag-shaped groove depth.

[0051] Step 6 Laser engraving and milling, part installation: Place the part on the fixture and support it with a three-jaw chuck. Since the deep oil storage groove of the part has been machined, according to the drawing requirements, it is difficult to determine the position of the flag-shaped groove where the vertical side of the flag-shaped groove is connected to the oil storage groove. A window with the same shape and size as the oil storage groove is machined on a 0.3-mm-thick iron sheet. Cover the iron sheet on the dynamic seal ring so that the window of the iron sheet coincides with the oil storage groove of the dynamic seal ring. Run the marking program in single-segment mode and move the dynamic seal ring to the appropriate position according to the position of the flag-shaped groove.

[0052] Step 6 Laser engraving and milling, part installation: Appropriate retaining hooks can be selected according to parts with different drawing numbers, and the retaining hooks and parts are glued together with a hot melt gun. Place them in the fixture, and the retaining hook leans against the limit rod on the fixture. Check whether there is a gap between the retaining hook and the limit rod. The limit rod plays a role in repeated positioning of the part during multiple clamping.

[0053] Step 6 Laser engraving and milling, marking times setting: According to past marking experience, the first marking times should be less than 60 times. Then, select the marked graphics, and click on general plane marking in the next process.

[0054] Step 6 Laser engraving and milling, coordinate setting: According to the number of flag-shaped grooves on the part drawing, it can be divided into three categories.

[0055] For the flag-shaped groove with 30 workstations, the coordinate of the first groove is X-axis coordinate 222.4 and Y-axis coordinate 288.8.

[0056] For the flag-shaped groove with 40 workstations, the coordinate of the first groove is X-axis coordinate 222.4 and Y-axis coordinate 313.8.

[0057] For the flag-shaped groove with 50 workstations, the coordinate of the first groove is X-axis coordinate 222.4 and Y-axis coordinate 341.3.

[0058] Step 6 Laser engraving and milling, height setting: For example, when the thickness of the workpiece is 24 mm, the set height of the z-axis is 387; when the thickness of the workpiece is 23 mm, the set height of the z-axis is 388; when the thickness of the workpiece is 25 mm, the set height of the z-axis is 386. Since the zero point of the z-axis of the equipment is at the top, as the thickness of the part increases, the z-axis height becomes smaller, and vice versa.

[0059] Step 7 Secondary processing. After the first processing inspection, if the dimensions are unqualified, the parts need to be reinstalled for secondary processing.

[0060] Step 7 Secondary processing: After the first processing inspection, if the difference between the deepest groove and the shallowest groove of the measurement result is less than 0.003, obtain the marking depth for each time according to the first marking times / the average of the deepest and shallowest measured values, and determine the marking times by calculating the value obtained by subtracting the average value from the final dimension. Repeat the operations in the first processing: select the marked pattern, click on general plane marking, repeat the motor reset, and click start after the motor reset.

[0061] Step 7 Secondary processing: After the first processing inspection, if the difference between the deepest groove and the shallowest groove of the measurement result is greater than 0.003, obtain the marking depth for each time according to the first marking times / the depth of the deepest value, and determine the marking times by calculating the value obtained by subtracting the average value from the final dimension. Repeat the operations in the first processing: select the marked pattern, click on general plane marking, select the marked pattern, click on general plane marking.

[0062] Step 7 Secondary processing: After the first processing inspection, there will be individual flag-shaped grooves that do not reach the size and need to be re-marked according to the measurement result. Reinstall the part for processing, determine the marking times according to the difference between the shallowest groove and the final dimension, repeat the operations in the first processing: select the marked pattern, click on general plane marking, check the re-marking, select the groove number to be re-marked, select the number of times as 1, and finally repeat the motor reset and click start after the motor reset.

[0063] Step 8 Inspection: Use a coordinate measuring machine to inspect the actual values of the part dimensions, flatness, and the depth of the flag-shaped grooves.

[0064] Step 9 Warehousing: Put the qualified parts into storage.

Claims

1. A gas turbine motor ring parts repair process, characterized by: The steps include: (1) Grinding and polishing; (2) Inspection; (3) Fine grinding; (4) Cleaning; (5) Inspection; (6) Laser engraving and milling; (7) Secondary processing; (8) Inspection; (9) Storage.

2. A gas turbine motor ring parts repair process according to claim 1, characterized in that: In the step (1), grinding and polishing, 3000# diamond grinding sand and water are selected, mixed and evenly added into a grinding and polishing machine, and the moving ring is placed into the grinding machine; the grinding machine worktable rotates at 40r / min, the grinding liquid is flushed for 2s every 30s, and the grinding is performed for 20min to remove the graphite ring residue on the surface of the moving ring.

3. A gas turbine motor ring parts repair process according to claim 1, characterized in that: The inspection in step (2) shows that the actual requirement for the three-coordinate flatness detection is 0.001mm, and the actual required depth of the flag-shaped groove in the dynamic ring design is 0.018+0.0021-0.0015mm. The decision on whether to continue using or repair is made based on the actual value. If repair is required, the thickness of the chrome plating layer on the working surface of the dynamic ring is measured, and the thickness is required to be within the range of 0.07-0.1mm.

4. A gas turbine motor ring parts repair process according to claim 1, characterized in that: In step (3), fine grinding is performed using 0.25 kg of 1200 mesh boron carbide powder, 200 ml of fully synthetic water-soluble cutting fluid, and water to fill the volume to 0.009 m 3 Solution bucket, and movable ring are put into the grinder. The grinder worktable rotates at 45r / min, the grinding liquid is flushed for 1s every 35s, and the grinding is carried out for 45min. After the grinding stops, wipe the surface of the movable ring, and use the interference method to check whether the flatness of the movable ring working surface is qualified on the flat crystal. If it is unqualified, adjust the grinder worktable appropriately. In the process of adjusting the grinder worktable, when the grinding surface of the part is higher on the outside and lower on the inside, tighten the middle screw of the grinding disk, and the principle of grinding the workpiece on the grinding platform is yin-yang grinding. In the process of adjusting the grinder worktable, when the part is higher on the outside and lower on the inside, the grinding platform is lower on the outside and higher on the inside, and the screws are tightened to lower the grinding platform until the grinding is qualified.

5. A gas turbine motor ring parts repair process according to claim 1, characterized in that: Step (4) Cleaning: The grinding sand in the oil storage tank is removed by ultrasonic cleaning.

6. A gas turbine motor ring parts repair process according to claim 1, characterized in that: Step (5) Inspection: After the parts are cleaned, three-coordinate inspection is performed to inspect the actual values ​​of the part size, chrome plating thickness, flatness and flag groove depth.

7. A gas turbine motor ring parts repair process according to claim 1, characterized in that: The step (6) of laser engraving and milling is to place the part on the tooling and prop it up with three claws, and a window with the same shape and size as the oil storage tank is processed on a 0.3mm thick iron sheet. The iron sheet is covered on the moving ring so that the iron sheet window and the moving ring oil storage tank overlap. The single-stage marking program is run to move the moving ring to a suitable position according to the position of the flag-shaped groove; select matching retaining hooks according to parts with different drawing numbers, and use a hot melt gun to stick the retaining hooks and parts together; put them into the tooling, and the retaining hooks are against the limit rods on the tooling, and check whether there is a gap between the retaining hooks and the limit rods; the first marking number is less than 60 times, and then the graphics to be marked are selected, and the next process clicks on general plane marking.

8. The gas turbine motor ring parts repair process according to claim 1 is characterized by: The step (7) of secondary processing means that if the size is unqualified, the parts are reinstalled for secondary processing: if the difference between the deepest groove and the shallowest groove in the measurement result is less than 0.003, the depth of each marking is obtained according to the number of markings for the first time / the average value of the deepest and shallowest measured values, and the number of markings is determined by calculating the value obtained by subtracting the average value from the final size; repeatedly select the graphics to be marked, click on the general plane marking, repeat the motor reset, and click start after the motor is reset.

9. A gas turbine motor ring parts repair process according to claim 1, characterized in that: The inspection in step (8) is a three-coordinate inspection of the actual values ​​of the part size, flatness and flag groove depth.

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