Impeller size repair method
By using horizontal and vertical clamping tools to precisely machine multiple repair surfaces of the impeller, the problem of substandard impeller dimensions was solved, the service life of the impeller was extended, and the normal operation of the hydraulic components of the main pump was ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- LINGDONG NUCLEAR POWER
- Filing Date
- 2023-12-27
- Publication Date
- 2026-06-30
AI Technical Summary
Existing technologies cannot effectively repair the problem of substandard impeller components, especially large, irregular impeller parts, which leads to substandard dimensional chains in the hydraulic components of the main pump.
Horizontal and vertical clamping tools are used to divide the impeller into multiple repair surfaces. Through clamping and adjustment, different repair surfaces are precisely machined, including turning and grinding of the outer circle, end face, inner wall of the tapered hole and inner wall of the round hole, to ensure that the amount of machining is minimized each time.
This enables precise repair of the impeller dimensions, increases the number of impeller repairs and its lifespan, and ensures the normal operation of the main pump's hydraulic components.
Smart Images
Figure CN117680918B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of repair technology for hydraulic components of main pumps in nuclear power plants, and in particular to methods for repairing impeller dimensions. Background Technology
[0002] Various types of pumps operate in all systems of a nuclear power plant. The main pump, located at the heart of the nuclear island, pumps hot water into the evaporator to convert it into heat energy. It is crucial for controlling the water circulation in nuclear power plant operations and is considered a Class I piece of equipment. The main pump's hydraulic components include the impeller assembly and mating key mounted on the pump shaft, diffuser, labyrinth seal ring, bearing assembly, heat shield, No. 1 sealing chamber, back-mounted impeller and mating key, and shorting connections. After each operating cycle, the main pump's hydraulic components must undergo a comprehensive disassembly and inspection to eliminate potential operational hazards for the next cycle.
[0003] After one cycle of use, some dimensions of the impeller component undergo slight deformation under operating conditions. During the disassembly and inspection of the main pump hydraulic components, it was discovered that some dimensions of the impeller component were out of specification. The internal tapered hole and keyway of the impeller component did not meet the required dimensions for mating with the pump shaft, ultimately resulting in the entire main pump hydraulic component dimensional chain being out of specification. Therefore, it was necessary to process and repair the impeller component to resolve the issue of its non-compliant dimensions.
[0004] However, related technologies generally only process or repair regular parts, while impellers are large, irregular parts. Existing methods for processing or repairing regular parts cannot be used to repair impellers. Summary of the Invention
[0005] Therefore, it is necessary to provide a method for repairing impeller dimensions to address the impeller repair problem.
[0006] A method for repairing impeller dimensions includes the following steps:
[0007] The impeller is divided into multiple repair surfaces, and corresponding clamping tools are selected for different repair surfaces. The clamping tools include vertical clamping tools and horizontal clamping tools.
[0008] The impeller is clamped by the horizontal clamping tool, and the horizontal clamping tool is adjusted to align the impeller. Then, the repair surface corresponding to the horizontal clamping tool is processed.
[0009] The impeller is clamped by the vertical clamping tool, and the vertical clamping tool is adjusted to align the impeller. Then, the repair surface corresponding to the vertical clamping tool is processed.
[0010] In one embodiment, the repair surface of the impeller includes an outer circle A, a B end face, a C end face, a conical hole inner wall D, an outer circle E, a F end face, a G end face, an H end face, and a circular hole inner wall M. The H end face, F end face, and B end face are arranged sequentially along the axial direction of the impeller. The outer circle A is connected to the B end face, and the outer circle E is connected to the H end face. The impeller has a conical hole and a circular hole that communicate with each other on the side near the B end face. The inner wall of the conical hole is the conical hole inner wall D. The end face of the conical hole away from the circular hole is the C end face. The inner wall of the circular hole is the circular hole inner wall M. The end face of the circular hole near the conical hole is the G end face.
[0011] The horizontal clamping tool includes multiple first jaws and multiple first adjustable supports. The multiple first adjustable supports are used to support the H end face, and the multiple first jaws are used to clamp the outer circle E. When the impeller is clamped by the horizontal clamping tool, it is used to repair the outer circle A, B end faces, C end faces and the inner wall D of the tapered hole.
[0012] In one embodiment, the step of clamping the impeller with the horizontal clamping tool and adjusting the horizontal clamping tool to align the impeller includes:
[0013] Alignment: Detect the runout of the impeller's outer diameter using a dial indicator, and adjust the position of the first chuck until the runout of the outer diameter is minimized; Detect the runout of the impeller's end face using a dial indicator, and adjust the height of the first adjustable support until the runout of the end face is minimized.
[0014] Clamping: The outer circle E of the impeller is clamped by the first jaw;
[0015] Re-measurement: Re-measure the runout value of the outer circle and the runout value of the end face using a dial indicator. If the runout value of the outer circle and / or the runout value of the end face are greater than 0.15mm, then recalibrate.
[0016] Wherein, the outer circle is outer circle A and / or outer circle E, and the end face is end face B and / or end face C.
[0017] In one embodiment, the alignment step further includes: using a dial indicator to detect the runout values of the inner walls at both ends of the conical hole inner wall D along the axial direction; if any runout value is greater than 0.1 mm, the position of the first chuck is adjusted until the runout value of the conical hole inner wall D is minimized.
[0018] In one embodiment, the step of processing the repair surface corresponding to the horizontal clamping tool includes:
[0019] Select end face C as the reference plane, determine the machining amount of end face C based on the alignment deformation amount, and turn end face C.
[0020] Based on end face C, the inner wall of the tapered hole, end faces D and B, and outer circle A are machined in sequence.
[0021] In one embodiment, the machining steps for the inner wall D of the tapered hole include:
[0022] Using end face C as a reference, use an internal turning tool to turn the inner wall D of the tapered hole multiple times until the turning allowance is reduced to 0.15mm.
[0023] The inner wall D of the tapered hole is ground multiple times using a grinding tool until the dimensions of the inner wall D of the tapered hole reach the repair dimensions.
[0024] In one embodiment, the processing steps for the B end face include:
[0025] Determine the machining amount of end face B based on the distance between end face C and end face B;
[0026] The B end face is turned multiple times. After each turning, the distance between the C end face and the B end face is measured using a depth measuring instrument, and the runout value of the B end face is measured using a dial indicator. The turning amount of the B end face in the next turn is determined based on the measured distance and runout value.
[0027] In one embodiment, the machining steps for the outer circle A include:
[0028] Determine the machining allowance for outer circle A based on the repair dimensions of outer circle A;
[0029] The outer circle A is machined in multiple stages. After each machining operation, the outer diameter of the outer circle A is measured with an outside micrometer, and the runout value of the outer circle A is measured with a dial indicator. The machining amount of the outer circle A in the next operation is determined based on the measured outer diameter and runout value.
[0030] In one embodiment, the vertical clamping tool includes a plurality of second jaws and a plurality of second adjustable supports. The plurality of second adjustable supports are used to support the B end face of the impeller, and the plurality of second jaws are used to clamp the outer circle A of the impeller. When the impeller is clamped by the vertical clamping tool, it is used to repair the G end face, H end face, inner wall M of the circular hole and outer circle E in sequence.
[0031] In one embodiment, the step of clamping the impeller with the vertical clamping tool and adjusting the vertical clamping tool to align the impeller includes:
[0032] Alignment: Detect the runout value of end face B using a dial indicator, and adjust the height of the second adjustable support until the runout value of end face B is minimized; Detect the runout value of the inner wall M of the circular hole using a dial indicator, and adjust the position of the second chuck until the runout value of the inner wall M of the circular hole is minimized.
[0033] Clamping: The outer circle A of the impeller is clamped by the second jaw;
[0034] Re-measurement: Re-measure the runout value of the B end face and the inner wall M of the circular hole using a dial indicator. If the runout value of the B end face and / or the inner wall M of the circular hole is greater than 0.15mm, then recalibrate.
[0035] In one embodiment, the steps for machining the G end face and the H end face include:
[0036] Select the G end face as the reference plane, determine the machining amount of the G end face based on the alignment deformation amount, and perform G end face turning multiple times. After each turning, use a wheel indicator to measure the runout value of the G end face, and determine the machining amount of the G end face for the next turning based on the runout value.
[0037] Measure the distance between end face G and end face H. Based on the distance between end face G and end face H, determine the machining amount of end face H. Perform turning on end face H in multiple stages. After each turning, measure the distance between end face G and end face H using a depth measuring instrument and measure the runout value of end face H using a dial indicator. Determine the machining amount of end face H for the next turning based on the measured distance and runout value.
[0038] In one embodiment, the steps for machining the inner wall M of the circular hole include:
[0039] Measure the dimension of the inner wall M of the circular hole using an inside diameter gauge;
[0040] Based on the measured dimensions of the inner wall M of the circular hole, the machining amount of the inner wall M of the circular hole is determined. The inner wall M of the circular hole is turned multiple times. After each turning, the dimensions of the inner wall M of the circular hole are measured using an inner diameter gauge, and the runout value of the inner wall M of the circular hole is measured using a wheel gauge. The machining amount of the inner wall M of the circular hole for the next turning is determined based on the measured dimensions and runout value.
[0041] The aforementioned impeller dimensional repair method involves dividing the impeller into multiple repair surfaces, then using a horizontal clamping tool to hold the impeller and process the repair surfaces corresponding to the horizontal clamping tool. A vertical clamping tool is then used to hold the impeller and process the repair surfaces corresponding to the vertical clamping tool, thus completing the impeller dimensional repair. Furthermore, after each clamping process, the clamping tool is first adjusted to align the impeller before processing the corresponding repair surfaces. This minimizes the processing amount for each repair surface, allowing for more frequent impeller repairs and extending the impeller's lifespan. Attached Figure Description
[0042] Figure 1 This is a step diagram of an impeller size repair method in one embodiment.
[0043] Figure 2This is a schematic diagram of the structure of a horizontal clamping tool holding an impeller in one embodiment.
[0044] Figure 3 This is a schematic diagram of the structure of a vertical clamping tool holding an impeller in one embodiment.
[0045] Reference numerals: 100, horizontal clamping tool; 110, first jaw; 120, first adjustable support;
[0046] 200. Vertical clamping tool; 210. Second chuck; 220. Second adjustable support;
[0047] 300. Impeller. Detailed Implementation
[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0049] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0050] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0052] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0053] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0054] See Figure 1 An embodiment of this application provides a method for repairing the dimensions of an impeller 300, comprising the following steps: dividing the impeller 300 into multiple repair surfaces, and selecting corresponding clamping tools for different repair surfaces, the clamping tools including a vertical clamping tool 200 and a horizontal clamping tool 100; clamping the impeller 300 with the horizontal clamping tool 100 and adjusting the horizontal clamping tool 100 to align the impeller 300, and then processing the repair surface corresponding to the horizontal clamping tool 100; clamping the impeller 300 with the vertical clamping tool 200 and adjusting the vertical clamping tool 200 to align the impeller 300, and then processing the repair surface corresponding to the vertical clamping tool 200.
[0055] In this embodiment, by dividing the impeller into multiple repair surfaces, a horizontal clamping tool 100 is used to clamp the impeller 300 to process the repair surface corresponding to the horizontal clamping tool 100. Then, a vertical clamping tool 200 is used to clamp the impeller 300 to process the repair surface corresponding to the vertical clamping tool 200, thereby completing the dimensional repair of the impeller 300. Furthermore, after each clamping operation, the clamping tool is first adjusted to align the impeller 300 before processing the corresponding repair surface. This minimizes the processing amount for each repair surface, allowing for the repair of the impeller 300 with minimal processing, thus increasing the number of repair cycles and extending the impeller 300's lifespan.
[0056] The repair surfaces of the impeller 300 include outer circle A, B end face, C end face, inner wall of the conical hole D, outer circle E, F end face, G end face, H end face, and inner wall of the circular hole M. Among them, the H end face, F end face, and B end face are arranged sequentially along the axial direction of the impeller 300. The outer circle A is connected to the B end face, and the outer circle E is connected to the H end face. The impeller 300 has a conical hole and a circular hole that are interconnected on the side near the B end face. The inner wall of the conical hole is the inner wall of the conical hole D. The end face of the conical hole away from the circular hole is the C end face. The inner wall of the circular hole is the inner wall of the circular hole M. The end face of the circular hole near the conical hole is the G end face.
[0057] See Figure 2 The horizontal clamping tool 100 includes multiple first jaws 110 and multiple first adjustable supports 120. The multiple first adjustable supports 120 are used to support the H end face, and the multiple first jaws 110 are used to clamp the outer circle E. When the impeller 300 is clamped by the horizontal clamping tool 100, it is used to repair the outer circle A, B end face, C end face and the inner wall D of the tapered hole.
[0058] In this embodiment, specifically, the horizontal clamping tool 100 includes a first chuck, first jaws 110, and a first adjustable support 120 respectively disposed on the first chuck. The first adjustable support 120 is used to support the H end face, and the multiple first jaws 110 are used to clamp the outer circle E, so that the axial direction of the impeller 300 is consistent with the axial direction of the first chuck, so as to facilitate the repair processing of the outer circle A, B end face, C end face and the inner wall D of the tapered hole from the end of the impeller 300 away from the first chuck.
[0059] The steps for aligning the impeller 300 by clamping it with a horizontal clamping tool 100 and adjusting the tool 100 include: First, alignment: Detecting the runout of the outer diameter of the impeller 300 using a dial indicator, and adjusting the position of the first jaw 110 until the runout is minimized; Detecting the runout of the end face of the impeller 300 using a dial indicator, and adjusting the height of the first adjustable support 120 until the end face runout is minimized; Then, clamping: Clamping the outer diameter E of the impeller 300 using the first jaw 110; Finally, re-measurement: Re-measuring the runout of the outer diameter and the end face using a dial indicator. If the runout of the outer diameter and / or the end face is greater than 0.15mm, then re-alignment is performed. Here, the outer diameter refers to outer diameter A and / or outer diameter E, and the end face refers to end face B and / or end face C.
[0060] In this embodiment, when the impeller 300 is clamped by the horizontal clamping tool 100, the runout value of the outer circle of the impeller 300 is detected by a dial indicator. The position of the first jaw 110 is adjusted until the runout value of the outer circle is minimized, that is, at this time the axis of the impeller 300 is close to the axis of the first chuck. Then, the runout value of the end face of the impeller 300 is detected by a dial indicator, and the height of the first adjustable support 120 is adjusted until the runout value of the end face is minimized, at which point the end face of the impeller 300 is nearly parallel to the surface of the first chuck. Based on this, machining the impeller 300 can reduce the amount of machining required for a single repair. After clamping, a second measurement is performed to prevent the impeller 300 from shifting during the clamping process.
[0061] The alignment process also includes: using a dial indicator to detect the runout values of the inner walls at both ends of the conical hole D along the axial direction. If any runout value is greater than 0.1mm, the position of the first chuck 110 is adjusted until the runout value of the inner wall D of the conical hole is minimized.
[0062] Since the tapered hole is used as a mating hole and needs to connect with other parts, in addition to ensuring the outer circle A and / or outer circle E, it is also necessary to check the runout value of the inner wall D of the tapered hole in order to reduce the machining amount of the inner wall D of the tapered hole.
[0063] The steps for machining the repair surface corresponding to the horizontal clamping tool 100 include selecting end face C as the reference surface, determining the machining amount of end face C based on the alignment deformation amount, and turning end face C; based on end face C, machining the inner wall D, end face B of the tapered hole and the outer circle A in sequence.
[0064] In this embodiment, end face C is used to mate with the labyrinth sealing ring. Therefore, end face C needs to be determined first, and then end face D and end face B of the inner wall of the tapered hole and outer circle A are machined sequentially using end face C as the reference surface.
[0065] The machining steps for the inner wall D of the tapered hole include: using the end face C as a reference, turning the inner wall D of the tapered hole multiple times with an internal turning tool until the turning allowance is reduced to 0.15mm, and grinding the inner wall D of the tapered hole multiple times with a grinding tool until the size of the inner wall D of the tapered hole reaches the repair size.
[0066] The machining steps for end face B include: determining the machining amount of end face B based on the distance between end face C and end face B; performing turning on end face B multiple times, with each turning operation involving measuring the distance between end face C and end face B using a depth gauge and measuring the runout value of end face B using a dial indicator; and determining the machining amount of end face B for the next turn based on the measured distance and runout value.
[0067] The machining steps for outer circle A include: determining the machining amount of outer circle A based on the repair dimensions of outer circle A; turning outer circle A in multiple stages, wherein after each turning, the outer diameter of outer circle A is measured using an outside micrometer, and the runout value of outer circle A is measured using a dial indicator; and the machining amount of outer circle A for the next turning stage is determined based on the measured outer diameter and runout value.
[0068] See Figure 3 In some embodiments, the vertical clamping tool 200 includes a plurality of second jaws 210 and a plurality of second adjustable supports 220. The plurality of second adjustable supports 220 are used to support the B end face of the impeller 300, and the plurality of second jaws 210 are used to clamp the outer circle A of the impeller 300. When the impeller 300 is clamped by the vertical clamping tool 200, it is used to repair the G end face, H end face, inner wall M of the circular hole and outer circle E in sequence.
[0069] In this embodiment, the vertical clamping tool 200 includes a second chuck, a plurality of second jaws 210 and a plurality of second adjustable supports 220 disposed on the second chuck. The plurality of second adjustable supports 220 are used to support the B end face of the impeller 300 so as to adjust the parallelism between the B end face and the chuck. The plurality of second jaws 210 are used to clamp the outer circle A of the impeller 300 so as to adjust the axis of the impeller 300 so that the axis of the impeller 300 coincides with the chuck.
[0070] Furthermore, the vertical clamping tool 200 includes multiple second jaws 210 and multiple second adjustable supports 220. The multiple second adjustable supports 220 are used to support the B end face of the impeller 300, and the multiple second jaws 210 are used to clamp the outer circle A of the impeller 300. When the impeller 300 is clamped by the vertical clamping tool 200, it is used to repair the G end face, H end face, inner wall M of the circular hole and outer circle E in sequence.
[0071] First, the impeller 300 is clamped by the horizontal clamping tool 100 to process the B end face of the impeller 300. Then, the B end face is placed on the second adjustable support 220. After the impeller 300 is aligned, the processing amount of the G end face and the H end face can be determined through the B end face.
[0072] In this embodiment, the steps of clamping the impeller 300 with the vertical clamping tool 200 and adjusting the vertical clamping tool 200 to align the impeller 300 include: First, alignment: The runout value of the B end face is detected by a dial indicator, and the height of the second adjustable support 220 is adjusted until the runout value of the B end face is minimized; the runout value of the inner wall M of the circular hole is detected by a dial indicator, and the position of the second jaw 210 is adjusted until the runout value of the inner wall M of the circular hole is minimized. Next, clamping: The outer circle A of the impeller 300 is clamped by the second jaw 210. Finally, re-measurement: The runout values of the B end face and the inner wall M of the circular hole are re-measured by a dial indicator. If the runout value of the B end face and / or the inner wall M of the circular hole is greater than 0.15 mm, alignment is repeated.
[0073] In this embodiment, end face B has been repaired during clamping with the horizontal clamping tool 100. By adjusting the runout value of end face B, the end face of impeller 300 can be aligned. The inner wall M of the circular hole serves as a mating hole; therefore, the runout value of the inner wall M of the circular hole must first be detected. By detecting the runout value of the inner wall M of the circular hole, the axis of impeller 300 can be made to coincide with the axis of the second chuck.
[0074] The machining steps for end faces G and H include: selecting end face G as the reference surface, determining the machining amount of end face G based on the alignment deformation, and performing multiple turning operations on end face G. After each turning operation, a dial indicator is used to measure the runout value of end face G, and the machining amount of end face G for the next turning operation is determined based on the runout value. The distance between end face G and end face H is measured, and the machining amount of end face H is determined based on this distance. End face H is then turned multiple times, with the distance between end face G and end face H measured using a depth measuring instrument after each turning operation, and the runout value of end face H measured using a dial indicator. The machining amount of end face H for the next turning operation is determined based on the measured distance and runout value.
[0075] The steps for machining the inner wall M of a circular hole include: measuring the dimensions of the inner wall M of the circular hole using an inside diameter gauge; determining the machining allowance of the inner wall M based on the measured dimensions; performing turning on the inner wall M of the circular hole multiple times; after each turning operation, measuring the dimensions of the inner wall M of the circular hole using an inside diameter gauge and measuring the runout value of the inner wall M of the circular hole using a dial indicator; and determining the machining allowance of the inner wall M of the circular hole for the next turning operation based on the measured dimensions and runout value.
[0076] In a specific embodiment, the method for clamping the impeller 300 using the horizontal clamping tool 100 is as follows:
[0077] Place the H end face of the suspended impeller 300 on the first adjustable support 120, roughly locate the center of the impeller 300, and lightly clamp the outer circle E with the pawl to ensure that the impeller 300 does not fall off when rotating.
[0078] The wheel gauge detects the runout (deformation) value of the outer circle E. Adjust the first pawl 110 to set this value to the minimum.
[0079] The wheel gauge detects the runout (deformation) value of the outer circle A. If the runout deviation is greater than 0.15mm, adjust the first chuck 110 to reduce this value to the minimum.
[0080] The wheel gauge detects the runout (deformation) value of end face B. An adjustable support is used to adjust the runout value to the minimum.
[0081] The wheel gauge detects the runout (deformation) value of the end face C.
[0082] Definition: The inner wall of the conical bore D along the axial direction of the impeller 300 at its larger end is designated as D1, and the inner wall of the conical bore D along the axial direction of the impeller 300 at its larger end is designated as D2. The diameter ratio of D1 to D2 is 1:10. The runout (deformation) values of the conical bores D1 and D2 are measured by the wheel gauge. If the deviation is greater than 0.1mm, the first chuck 110 is adjusted to minimize the value, requiring the runout deviation of the outer circle A and the end face C to be measured.
[0083] Recheck the runout (deformation) value of the outer circle A of the wheel gauge. If the error is large compared with the original alignment accuracy, readjust the chuck alignment and take into account the runout value of the B end face.
[0084] The wheel gauge was retested to measure the runout (deformation) values of D1 and D2.
[0085] The wheel gauge was used to remeasure the runout (deformation) value of the outer circle E.
[0086] Use the first jaw 110 wrench to clamp the outer circle E, and recheck whether the runout values of the outer circle A and B end faces are consistent with those before clamping.
[0087] After clamping, recheck whether the runout values of the reference end face C and the outer circle E are consistent with those before clamping.
[0088] After clamping, recheck whether the runout (deformation) values of D1 and D2 are consistent with those before clamping.
[0089] After confirming that all dimensions are correct, select a suitable face cutting tool and clamp it onto the lathe tool post. When clamping the tool, the tool tip should be aligned with the center of the impeller 300.
[0090] Start the machine tool and let the oil pump run for a while. Then start the machine tool spindle to idle. Once the oil pressure is stable, select the machining speed.
[0091] Based on the impeller 300 alignment data and repair machining dimensions, set the machine tool machining parameters. Use the C end face as the reference surface and machine away all the deformation after alignment.
[0092] Determine the feed amount for turning the C-end face based on the amount of deformation during alignment, and set the machine tool machining parameters.
[0093] After setting the machining parameters, the C end face was turned. After turning, the C end face was measured with a dial indicator, and the measurement data was 0.
[0094] After the C-end face is machined, the tapered hole is turned using the C-end face as a reference.
[0095] Remove the facing tool from the lathe tool post and install the internal turning tool. When clamping the tool, ensure that the tool tip is at the same height as the center of the impeller 300.
[0096] After determining the initial feed rate, set the machine tool machining parameters according to the machine tool speed and feed rate.
[0097] After the machining parameters are set, the inner wall D of the 300 tapered hole of the impeller is machined using an internal turning tool. After the first turning is completed, the roughness value of the tapered hole after turning is checked with a roughness tester, and the tapered contact surface is checked with a tapered test bar. At the same time, the dimensions of the large end face and the C end face of the tapered test bar are measured with a depth measuring instrument.
[0098] After repeating the second, third, and fourth feeds, after each turning operation, use a roughness tester to check the roughness value of the taper hole, and use a taper test bar to check the taper contact surface. At the same time, use a depth measuring instrument to measure the dimensions of the large end face and C end face of the taper test bar. Finally, leave a 0.15mm allowance for grinding.
[0099] After the turning process is completed, remove the internal turning tool from the lathe tool post and install the self-developed and designed grinding tool. When clamping the grinding tool, make sure that the grinding head and the impeller 300 center are at the same height.
[0100] After determining the initial grinding feed rate, set the machine tool machining parameters according to the machine tool speed and feed rate. After the machining parameters are set, use a grinding tool to grind the remaining material of the 300mm inner tapered hole of the impeller. After the first grinding is completed, use a roughness tester to check the roughness value of the ground tapered hole, and use a tapered test bar to check the tapered contact surface. At the same time, use a depth measuring instrument to measure the dimensions of the large end face and the C end face of the tapered test bar.
[0101] Repeat the second grinding process. After the second grinding is completed, use a roughness tester to check the roughness value of the ground tapered hole and use a tapered test bar to check the tapered contact surface. At the same time, use a depth measuring instrument to measure the dimensions of the large end face and the C end face of the tapered test bar.
[0102] Based on the final inner hole taper repair machining dimensions given for the main pump hydraulic component refurbishment impeller 300 repair machining, the final grinding machining is completed.
[0103] After the internal taper grinding is completed, remove the grinding tool from the lathe tool post and install the end-facing tool. When clamping the tool, ensure that the tool tip is at the same height as the center of the impeller 300.
[0104] Using end face C as a reference, measure the distance between end face C and end face B with a depth measuring instrument.
[0105] Based on the distance from end face C to end face B, determine the machining allowance for end face B. Based on the machining allowance, determine the initial feed rate for end face B, and set the machine tool machining parameters according to the determined machine tool speed and feed rate.
[0106] After the machining parameters are set, the B end face is turned for the first time. After the turning is completed, the distance between the C end face and the B end face is measured with a depth measuring instrument, and then the end face runout is measured with a dial indicator on the B end face.
[0107] Based on the dimensions measured during the first turning operation, determine the amount of material to be cut during the second turning operation and complete the setting of the machine tool machining parameters.
[0108] After the machining parameters are set, the B end face is turned a second time. After the turning is completed, the distance between the C end face and the B end face is measured with a depth measuring instrument, and then the end face runout is measured with a dial indicator on the B end face.
[0109] Based on the second turning measurement, determine the final turning amount and complete the machine tool machining parameter settings.
[0110] After the machining parameters are set, the B end face is turned for the final time. After the turning is completed, the distance between the C end face and the B end face is measured with a depth measuring instrument, and then the end face runout is measured with a dial indicator on the B end face.
[0111] After the B end face is machined, the outer circle A is turned.
[0112] Remove the facing tool from the lathe tool post and install the external turning tool. When clamping the tool, ensure that the tool tip is at the same height as the center of the impeller at 300°.
[0113] Based on the repair dimensions, determine the machining allowance for outer circle A. Based on the machining allowance, determine the initial feed rate for outer circle A, and set the machine tool machining parameters according to the determined machine tool speed and feed rate.
[0114] After the machining parameters are set, the outer circle A is turned for the first time. After the turning is completed, the outer diameter of the outer circle A is measured with an outside micrometer, and then the runout of the outer circle A is measured with a dial indicator.
[0115] Based on the dimensions measured during the first turning operation, determine the amount of material to be cut during the second turning operation and complete the setting of the machine tool machining parameters.
[0116] After the machining parameters are set, the outer circle A is turned a second time. After the turning is completed, the outer diameter of the outer circle A is measured with an outside micrometer, and then the runout of the outer circle A is measured with a dial indicator.
[0117] Based on the second turning measurement, determine the final turning amount and complete the machine tool machining parameter settings.
[0118] After the machining parameters are set, perform the final turning of outer circle A. After turning, first use an outside micrometer to measure the outer diameter of outer circle A, and then use a dial indicator to measure the runout of outer circle A.
[0119] After the outer circle A is machined, the machining chips of impeller 300 are cleaned and impeller 300 is hoisted onto a vertical CNC lathe.
[0120] In a specific embodiment, the method for clamping the impeller 300 using the vertical clamping tool 200 is as follows:
[0121] The suspended impeller 300 rests on the second adjustable support 220 with its B end face against the adjustable support point, and the B end face of the impeller 300 is firmly supported by copper shims. The second chuck 210 clamps the outer circle A, and copper shims are placed between the chuck and the outer circle of the impeller 300 to avoid damaging the outer circle of the impeller 300. The center of the impeller 300 is roughly located, and the chuck slightly clamps the outer circle A to ensure that the impeller 300 is not thrown out when rotating.
[0122] The wheel gauge detects the runout (deformation) value of end face B. An adjustable support is used to adjust the runout value to the minimum.
[0123] The gauge detects the runout (deformation) value of the inner wall M of the circular hole, and adjusts the jaws to minimize this value.
[0124] The wheel gauge detects the runout (deformation) value of the outer circle E, and analyzes whether the runout value of the inner wall M of the circular hole is consistent with the deformation value of the outer circle E.
[0125] The wheel gauge detects the runout (deformation) value of the end face H, and analyzes whether the runout value of the end face B is consistent with the runout value of the end face H.
[0126] The wheel gauge detects the runout (deformation) value of the G end face and analyzes whether the runout and deformation values of the B end face, H end face and G end face are consistent.
[0127] After using a chuck wrench to symmetrically clamp the outer circle E, re-measure the runout (deformation) value of the B end face with the dial indicator to see if it is consistent with the runout value before clamping, or if the runout value of the B end face is greater than 0.15mm. If they are inconsistent or the runout value is greater than 0.15mm, then recalibrate.
[0128] After clamping, the gauge re-measures whether the runout (deformation) value of the inner wall M of the round hole is consistent with the runout value before clamping, or whether the runout value of the inner wall M of the round hole is greater than 0.15mm. If they are inconsistent or the runout value is greater than 0.15mm, then recalibrate.
[0129] After clamping, the dial indicator re-measures the runout (deformation) value of the outer circle E, and analyzes whether the runout value of the inner wall M of the hole is consistent with the runout value of the outer circle E. If they are inconsistent, the machining amount is determined based on the inner wall M of the hole.
[0130] After clamping, the gauge remeasures the runout (deformation) value of the H end face and the G end face, and analyzes whether the runout deformation values of the B end face, H end face, and G end face are consistent. If they are inconsistent, the machining amount is determined based on the B end face.
[0131] After confirming that all dimensions are correct, select a suitable brand of face turning tool and mount it on the vertical lathe tool post.
[0132] Based on the impeller 300 alignment data and repair machining dimensions, the machine tool machining parameters were set. Using the G end face as the reference surface, the deformation was removed in three passes.
[0133] Using the G end face as a reference, measure the distance from the G end face to the H end face with a depth measuring instrument.
[0134] Based on the distance between end face G and end face H, determine the machining allowance for end face G. Based on the machining allowance, determine the initial feed rate for end face G, and set the machine tool machining parameters according to the determined machine tool speed and feed rate.
[0135] After the machining parameters are set, the G end face is turned for the first time. After the turning is completed, the distance between the G end face and the H end face is measured with a depth measuring instrument, and then the end face runout is measured with a dial indicator on the G end face.
[0136] Based on the dimensions measured during the first turning operation, determine the amount of material to be cut during the second turning operation and complete the setting of the machine tool machining parameters.
[0137] After the machining parameters are set, the G end face is turned a second time. After the turning is completed, the distance between the G end face and the H end face is measured with a depth measuring instrument, and then the end face runout of the B end face of the impeller 300 is measured with a dial indicator.
[0138] Based on the second turning measurement, determine the final turning amount and complete the machine tool machining parameter settings.
[0139] After the machining parameters are set, the G end face is turned for the final time. After the turning is completed, the distance between the G end face and the H end face is measured with a depth measuring instrument, and then the end face runout is measured with a dial indicator.
[0140] Based on the dimensions after machining the G end face, and according to the machining dimensions given by the repair machining dimensions, the dimensions that need to be machined on the H end face are calculated. Based on the machining dimensions, the machining amount from the H end face to the G end face is determined to be completed in three passes.
[0141] Based on the distance between end faces G and H, determine the machining allowance for end face H. Based on this allowance, determine the initial feed rate for end face H, and set the machine tool machining parameters according to the determined machine tool speed and feed rate.
[0142] After the machining parameters are set, the H end face is turned for the first time. After the turning is completed, the distance between the G end face and the H end face is measured with a depth measuring instrument, and then the end face runout is measured with a dial indicator.
[0143] Based on the dimensions measured during the first turning operation, determine the amount of material to be cut during the second turning operation and complete the setting of the machine tool machining parameters.
[0144] After the machining parameters are set, the H end face is turned a second time. After the turning is completed, the distance between the G end face and the H end face is measured with a depth measuring instrument, and then the end face runout is measured with a dial indicator on the H end face.
[0145] Based on the second turning measurement, determine the final turning amount of the H end face and complete the machine tool machining parameter settings.
[0146] After the machining parameters are set, the H end face is turned for the final time. After turning, the distance between the G end face and the H end face is measured with a depth measuring instrument, and then the end face runout is measured with a dial indicator.
[0147] After machining the G and H end faces, the machine tool machining parameters are set according to the impeller 300 alignment data and the repair machining dimensions. Using the inner wall M of the circular hole as the reference surface, the deformation is removed by two feeds to achieve the repaired inner hole machining dimensions.
[0148] Remove the end-facing tool from the CNC vertical lathe tool post and install the internal-hole tool.
[0149] Use an inside diameter gauge to measure the inner wall dimension M of a circular hole.
[0150] Based on the measured dimensions of the inner wall M of the circular hole, determine the machining allowance for the inner wall M. Based on the machining allowance, determine the initial feed rate for the inner wall M, and set the machine tool machining parameters according to the determined machine tool speed and feed rate.
[0151] After the machining parameters are set, the inner wall M of the round hole is machined for the first time. After the machining is completed, the inner wall M of the round hole is measured with an inner diameter gauge, and then the inner circle runout of the inner wall M is measured with a dial indicator.
[0152] Based on the first turning measurement, determine the final turning amount M of the inner wall of the circular hole, and complete the machine tool machining parameter setting.
[0153] After the machining parameters are set, the inner wall M of the round hole is turned for the final time. After turning, the inner wall M of the round hole is measured with an inside diameter gauge, and then the inner circle runout of the inner wall M is measured with a dial indicator.
[0154] After the inner wall M of the circular hole is machined, the machine tool machining parameters are set according to the alignment data and the repair machining dimensions. Using the inner wall M of the circular hole as the reference, the outer circle E is turned in two passes.
[0155] Remove the internal turning tool from the CNC vertical lathe tool post and install the external turning tool.
[0156] Use an outside micrometer to measure the outer circle E dimension.
[0157] Based on the measured dimension of outer circle E, determine the machining allowance for outer circle E. Based on the machining allowance, determine the initial feed rate for outer circle E, and set the machine tool machining parameters according to the determined machine tool speed and feed rate.
[0158] After the machining parameters are set, the outer diameter E is turned for the first time. After the turning is completed, the outer diameter E is first measured with an outside micrometer, and then the runout of the outer diameter E is measured with a dial indicator.
[0159] Based on the first turning measurement, determine the final turning amount of the outer circle E, and complete the machine tool machining parameter settings.
[0160] After the machining parameters are set, the outer diameter E is turned for the final time. After turning, the outer diameter E is measured with an outside micrometer, and then the runout of the outer diameter E is measured with a dial indicator.
[0161] After all the machining processes are completed, the iron filings from the impeller 300 are cleaned, and the impeller 300 is hoisted onto a CNC floor-type milling and boring machine.
[0162] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0163] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A method for repairing impeller dimensions, characterized in that, Includes the following steps: The impeller is divided into multiple repair surfaces, and corresponding clamping tools are selected for different repair surfaces. The clamping tools include vertical clamping tools and horizontal clamping tools. The impeller is clamped by the horizontal clamping tool, and the horizontal clamping tool is adjusted to align the impeller. Then, the repair surface corresponding to the horizontal clamping tool is processed. The impeller is clamped by the vertical clamping tool, and the vertical clamping tool is adjusted to align the impeller. Then, the repair surface corresponding to the vertical clamping tool is processed. The repair surface of the impeller includes an outer circle A, a B end face, a C end face, a conical hole inner wall D, an outer circle E, a F end face, a G end face, an H end face, and a circular hole inner wall M. The H end face, F end face, and B end face are arranged sequentially along the axial direction of the impeller. The outer circle A is connected to the B end face, and the outer circle E is connected to the H end face. The impeller has a conical hole and a circular hole that are interconnected on the side near the B end face. The inner wall of the conical hole is the conical hole inner wall D. The end face of the conical hole away from the circular hole is the C end face. The inner wall of the circular hole is the circular hole inner wall M. The end face of the circular hole near the conical hole is the G end face. The horizontal clamping tool includes multiple first jaws and multiple first adjustable supports. The multiple first adjustable supports are used to support the H end face, and the multiple first jaws are used to clamp the outer circle E. When the impeller is clamped by the horizontal clamping tool, it is used to repair the outer circle A, B end faces, C end face and the inner wall D of the tapered hole. The step of clamping the impeller with the horizontal clamping tool and adjusting the horizontal clamping tool to align the impeller includes: Alignment: Detect the runout of the impeller's outer diameter using a dial indicator, and adjust the position of the first chuck until the runout of the outer diameter is minimized; Detect the runout of the impeller's end face using a dial indicator, and adjust the height of the first adjustable support until the runout of the end face is minimized. Clamping: The outer circle E of the impeller is clamped by the first jaw; Re-measurement: Re-measure the runout value of the outer circle and the runout value of the end face using a dial indicator. If the runout value of the outer circle and / or the runout value of the end face is greater than 0.15mm, then recalibrate. Wherein, the outer circle is outer circle A and / or outer circle E, and the end face is end face B and / or end face C; The vertical clamping tool includes multiple second jaws and multiple second adjustable supports. The multiple second adjustable supports are used to support the B end face of the impeller, and the multiple second jaws are used to clamp the outer circle A of the impeller. When the impeller is clamped by the vertical clamping tool, it is used to repair the G end face, H end face, inner wall M of the circular hole and outer circle E in sequence. The step of clamping the impeller with the vertical clamping tool and adjusting the vertical clamping tool to align the impeller includes: Alignment: Detect the runout value of end face B using a dial indicator, and adjust the height of the second adjustable support until the runout value of end face B is minimized; Detect the runout value of the inner wall M of the circular hole using a dial indicator, and adjust the position of the second chuck until the runout value of the inner wall M of the circular hole is minimized. Clamping: The outer circle A of the impeller is clamped by the second jaw; Re-measurement: Re-measure the runout value of the B end face and the inner wall M of the circular hole using a dial indicator. If the runout value of the B end face and / or the inner wall M of the circular hole is greater than 0.15mm, then recalibrate.
2. The impeller size repair method according to claim 1, characterized in that, The alignment step further includes: using a dial indicator to detect the runout values of the inner walls at both ends of the inner wall of the conical hole D along the axial direction. If any runout value is greater than 0.1mm, the position of the first chuck is adjusted until the runout value of the inner wall of the conical hole D is minimized.
3. The impeller size repair method according to claim 1, characterized in that, The step of processing the repair surface corresponding to the horizontal clamping tool includes: Select end face C as the reference plane, determine the machining amount of end face C based on the alignment deformation amount, and turn end face C. Based on end face C, the inner wall of the tapered hole, end faces D and B, and outer circle A are machined in sequence.
4. The impeller size repair method according to claim 3, characterized in that, The machining steps for the inner wall D of the tapered hole include: Using end face C as a reference, use an internal turning tool to turn the inner wall D of the tapered hole multiple times until the turning allowance is reduced to 0.15mm. The inner wall D of the tapered hole is ground multiple times using a grinding tool until the dimensions of the inner wall D of the tapered hole reach the repair dimensions.
5. The impeller size repair method according to claim 3, characterized in that, The processing steps for the B end face include: Determine the machining amount of end face B based on the distance between end face C and end face B; The B end face is turned multiple times. After each turning, the distance between the C end face and the B end face is measured using a depth measuring instrument, and the runout value of the B end face is measured using a dial indicator. The turning amount of the B end face in the next turn is determined based on the measured distance and runout value.
6. The impeller size repair method according to claim 3, characterized in that, The machining steps for the outer circle A include: Determine the machining allowance for outer circle A based on the repair dimensions of outer circle A; The outer circle A is machined in multiple stages. After each machining operation, the outer diameter of the outer circle A is measured with an outside micrometer, and the runout value of the outer circle A is measured with a dial indicator. The machining amount of the outer circle A in the next operation is determined based on the measured outer diameter and runout value.
7. The impeller size repair method according to claim 1, characterized in that, The steps for machining the G end face and H end face include: Select the G end face as the reference plane, determine the machining amount of the G end face based on the alignment deformation amount, and perform G end face turning multiple times. After each turning, use a wheel indicator to measure the runout value of the G end face, and determine the machining amount of the G end face for the next turning based on the runout value. Measure the distance between end face G and end face H. Based on the distance between end face G and end face H, determine the machining amount of end face H. Perform turning on end face H in multiple stages. After each turning, measure the distance between end face G and end face H using a depth measuring instrument and measure the runout value of end face H using a dial indicator. Determine the machining amount of end face H for the next turning based on the measured distance and runout value.
8. The impeller size repair method according to claim 1, characterized in that, The steps for machining the inner wall M of the circular hole include: Measure the dimension of the inner wall M of the circular hole using an inside diameter gauge; Based on the measured dimensions of the inner wall M of the circular hole, the machining amount of the inner wall M of the circular hole is determined. The inner wall M of the circular hole is turned multiple times. After each turning, the dimensions of the inner wall M of the circular hole are measured using an inner diameter gauge, and the runout value of the inner wall M of the circular hole is measured using a wheel gauge. The machining amount of the inner wall M of the circular hole for the next turning is determined based on the measured dimensions and runout value.