Laser quenching main shaft of energy storage centrifugal compressor, machining process of laser quenching main shaft and compressor

Abstract

The invention discloses a laser quenching main shaft of an energy storage centrifugal compressor, a machining process of the laser quenching main shaft and the compressor. Wherein the main shaft is provided with a plurality of sections in the axial direction, each section at least comprises an end flange plate section, a thrust plate section, a first sealing section and a second sealing section, the end flange plate section is provided with a connecting hole connected with a driving part of the energy storage centrifugal compressor, and the thrust plate section is configured to be matched with a thrust bearing of the energy storage centrifugal compressor; the first sealing section and the second sealing section are configured to be directly matched with a sealing carbon ring of the energy storage centrifugal compressor; wherein the multiple connecting holes are evenly distributed with the center position of the main shaft as the circle center, the tolerance requirement of the connecting holes is phi 13H7, and the position tolerance of the connecting holes and the center line of the main shaft is phi 0.05 mm; and the surface hardness of the first sealing section and the second sealing section meets HRC58-62. Therefore, the assembling difficulty of the main shaft and the driving part can be reduced, the safety of equipment can be improved, and the shaft end sealing can meet the leakage rate control requirement.

Description

Technical Field

[0001] This application relates to the field of compressor component processing and manufacturing technology, and in particular to a laser-quenched spindle for an energy storage centrifugal compressor and its processing technology, as well as the compressor itself. Background Technology

[0002] As the central carrier of the centrifugal compressor rotor, the main shaft is responsible for transmitting the torque of the drive unit, driving the impeller to perform work on the gas. The main shaft works in conjunction with the seals to reduce leakage and improve efficiency.

[0003] In related technologies, the main shaft of an energy storage centrifugal compressor is typically connected to the drive unit using a conical hydraulic coupling. However, hydraulic couplings utilize hydraulic pumps, which are time-consuming and labor-intensive to install. Furthermore, repeated disassembly and reassembly of the conical coupling cannot guarantee the required 85% contact area between its inner surface and the main shaft. Therefore, installation is inconvenient and poses safety hazards during use. Since some energy storage centrifugal compressors require daily start-up and shutdown in the field, using a conical hydraulic coupling to connect to the drive unit would negatively impact the compressor's performance.

[0004] Meanwhile, in related technologies, the main shaft of centrifugal compressors typically uses a comb-tooth seal as the shaft end seal to cooperate with the shaft sleeve, and the shaft sleeve material is 12Cr13. However, the inlet and outlet pressure difference of some centrifugal compressors is extremely large, and the conventional comb-tooth seal shaft end seal form cannot meet the leakage control requirements.

[0005] Therefore, how to achieve convenient assembly with the drive unit and cooperate with the seals to meet the leakage control requirements has become a technical problem that the centrifugal compressor spindle urgently needs to solve. Summary of the Invention

[0006] In view of this, in order to solve at least one of the above technical problems, this application provides a laser-quenched spindle for an energy storage centrifugal compressor, its processing technology, and the compressor.

[0007] To achieve the above objectives, this application mainly provides the following technical solutions: In a first aspect, this application provides a laser-hardened spindle for an energy storage centrifugal compressor. The spindle has multiple segments arranged axially, each segment including at least an end flange segment, a thrust plate segment, a first sealing segment, and a second sealing segment. The end flange segment has a connecting hole for connecting to the drive unit of the energy storage centrifugal compressor. The thrust plate segment is configured to cooperate with the thrust bearing of the energy storage centrifugal compressor. The first and second sealing segments are configured to directly cooperate with the sealing carbon ring of the energy storage centrifugal compressor. The multiple connecting holes are evenly distributed around the center of the spindle, and the tolerance requirement for the connecting holes is φ13H7. The positional tolerance between the connecting holes and the centerline of the spindle is φ0.05 mm. The surface hardness of the first and second sealing segments meets HRC58-62.

[0008] In a second aspect, this application provides a laser-quenched spindle machining process for an energy storage centrifugal compressor, used to process the aforementioned laser-quenched spindle of the energy storage centrifugal compressor. The machining process includes: sequential roughing of the blank, heat treatment, semi-finishing, stabilization treatment, pre-quenching machining, laser quenching, and finishing; wherein, the first sealing section and the second sealing section are subjected to local heat treatment through laser quenching.

[0009] For example, the rough machining operation of the blank includes: rough machining the center holes at both ends of the blank; rough machining the shaft diameter of each section using a lathe; and wire drilling the heat treatment chuck hole.

[0010] For example, the semi-finishing operation includes: semi-finishing the center hole; machining the first stand on a lathe, supporting the workpiece through the first stand, cutting the test bar, and then re-machining the center hole near the end of the test bar; checking the mechanical properties of the test bar; semi-finishing each section on a lathe with a first machining allowance, the first machining allowance being a single-sided allowance of 2mm; and performing ultrasonic testing on the workpiece.

[0011] For example, the pre-quenching machining operations include: machining a second stand on a lathe, supporting the workpiece in the second stand, cutting off the heat treatment chuck, flattening the end face, and remachining the center hole at the end near the heat treatment chuck; hoisting the workpiece and turning it around, flattening the end face away from the heat treatment chuck, and remachining the center hole; machining each section on a lathe with a second machining allowance; machining each section on a grinding machine with a third machining allowance; after magnetic particle inspection, cleaning, grinding, and rust prevention treatment; and machining the empty tool groove at the root of the shaft of each section by turning.

[0012] For example, machining each segment on a lathe with a second machining allowance includes: the segment further includes a threaded segment, the threaded segment is unthreaded, and the second machining allowance of the shaft diameter of the threaded segment is 0.40mm to 0.60mm; the second machining allowance of the shaft diameter of the first sealing segment and the second sealing segment is 0.30mm to 0.40mm; the machining allowance of the shaft diameter of the remaining segments is 0.60mm to 0.70mm; and the second machining allowance of one side of the two end faces of the thrust plate segment is 0.30mm to 0.40mm.

[0013] For example, the third machining allowance for each section is made by grinding: the third machining allowance for the shaft diameter of the first sealing section and the second sealing section is 0.20±0.05mm, the third machining allowance for the shaft diameter of the remaining sections is 0.50±0.05mm, and the third machining allowance for each side of the two end faces of the thrust disc section is 0.20mm.

[0014] For example, the finishing operations include: the section also includes bearing sections near the two ends; using the shaft diameters of the two bearing sections as a reference, a dial indicator is used for alignment; after finishing the centers at both ends on a lathe, the shaft diameters of each section are aligned using a dial indicator; the shaft diameters of each section are finished using a grinding machine, and the two end faces of the thrust disc end are finished; the external threads of the threaded section are finished using a lathe, the root fillets and end chamfers of each shaft are machined, the shaft diameter of the vibration measurement zone of the bearing section is rolled, and the end face, end face stop, and outer circle of the end flange section are finished; using a boring machine, with the shaft diameters of the two bearing sections as a reference, a dial indicator is used for alignment, and with the end face and outer circle of the end flange section as a reference, the connecting holes are drilled, expanded, and reamed; after magnetic particle testing, the remaining machined holes and grooves are scribed, the machined holes are drilled according to the lines, the machined grooves are milled, demagnetized, and comprehensively tested.

[0015] For example, the heat treatment includes: normalizing using a pit furnace, holding at 860°C for 9 hours and then air cooling; quenching using a pit furnace, holding at 850°C for 9 hours and then oil cooling; tempering using a pit tempering furnace, holding at 590°C for 13 hours and then air cooling; and / or, the stabilization treatment includes: using a pit tempering furnace, holding at 550°C for 26 hours and then air cooling.

[0016] A third aspect of this application provides an energy storage centrifugal compressor, comprising: a drive unit, and the aforementioned laser-hardened spindle of the energy storage centrifugal compressor.

[0017] This application provides a laser-quenched spindle for an energy storage centrifugal compressor, its processing technology, and the compressor itself. By rationally designing the spindle structure, including an end flange section, a thrust plate section, a first sealing section, and a second sealing section, and connecting the end flange section to the drive unit, it avoids the installation difficulties and safety hazards associated with using conical hydraulic couplings to connect the spindle and drive unit in related technologies. This reduces assembly difficulty and safety risks, and improves equipment safety. By rationally setting the machining accuracy, assembly accuracy, and positional accuracy of the connecting holes on the flange sections, the overall performance of the equipment is improved. Furthermore, by including a thrust plate section on the spindle, even with a large outer diameter of the spindle end face, smooth assembly of the spindle and the thrust bearing mating surface can be achieved. By setting a first sealing section and a second sealing section on the main shaft, and ensuring that the surface hardness of the first sealing section and the second sealing section meets HRC58-62, the first sealing section and the second sealing section can directly cooperate with the sealing carbon ring. This simplifies the setting of the 12Cr13 bushing material and meets the design requirements of the carbon ring seal. As a result, the shaft end seal of the main shaft meets the leakage control requirements.

[0018] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein: Figure 1 One of the structural schematic diagrams of the spindle provided in the embodiments of this application is shown; Figure 2 A second schematic diagram of the spindle structure provided in an embodiment of this application is shown; Figure 3 One of the design drawings of the spindle is shown; Figure 4 The second design drawing of the spindle is shown; Figure 5 One of the structural schematic diagrams of the spindle blank provided in the embodiments of this application is shown; Figure 6 A schematic diagram of the rough machining of the spindle provided in an embodiment of this application is shown; Figure 7 A simplified diagram of the spindle laser hardening and dial indicator inspection process provided in this application embodiment is shown. Figure 8 This paper shows one of the schematic diagrams of the laser quenching spindle machining process for an energy storage centrifugal compressor provided in an embodiment of this application.

[0020] in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100 Main shaft, 110 End flange section, 111 Connecting hole, 120 Thrust disc section, 130 First sealing section, 140 Second sealing section, 150 Bearing section, 151 Vibration measurement zone; 200 blank, 201 center hole, 210 heat treatment chuck, 211 heat treatment chuck hole, 220 test bar. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] like Figures 1 to 8As shown in the embodiments of this application, a laser-hardened spindle 100 for an energy storage centrifugal compressor and its processing technology, as well as a compressor, are provided. The laser-hardened spindle 100 for an energy storage centrifugal compressor is applied to an energy storage centrifugal compressor, and the processing technology for the laser-hardened spindle 100 for an energy storage centrifugal compressor is used to process the laser-hardened spindle 100 for an energy storage centrifugal compressor.

[0023] like Figure 1 and Figure 2 As shown in the embodiment of this application, a laser-hardened spindle 100 for an energy storage centrifugal compressor is provided. The spindle 100 has multiple segments arranged along the axial direction. Each segment includes at least an end flange segment 110, a thrust plate segment 120, a first sealing segment 130, and a second sealing segment 140. The end flange segment 110 has a connecting hole 111 for connecting to the drive unit of the energy storage centrifugal compressor. The thrust plate segment 120 is configured to cooperate with the thrust bearing of the energy storage centrifugal compressor. The first sealing segment 130 and the second sealing segment 140 are configured to directly cooperate with the sealing carbon ring of the energy storage centrifugal compressor. The multiple connecting holes 111 are evenly distributed with the center position of the spindle 100 as the center. The tolerance requirement for the connecting holes 111 is φ13H7, and the positional tolerance between the connecting holes 111 and the center line of the spindle 100 is φ0.05 mm. The surface hardness of the first sealing segment 130 and the second sealing segment 140 meets HRC58-62.

[0024] The laser-hardened spindle 100 of the energy storage centrifugal compressor provided in this embodiment features an end flange section 110. The spindle is connected to the drive unit via a connection hole 111 on the end flange section 110. This flange structure replaces the traditional conical hydraulic coupling structure, solving the problems of time-consuming and labor-intensive installation of hydraulic couplings using hydraulic pumps, and the inability to guarantee the 85% contact area between the inner surface of the conical coupling and the spindle 100 after repeated disassembly and assembly. This also reduces potential safety hazards during equipment use. Therefore, this embodiment improves the structure of the spindle 100 by connecting the end flange section 110 to the drive unit, simplifying assembly operations, reducing assembly difficulty and safety hazards, improving assembly efficiency, and enhancing the safety of the energy storage centrifugal compressor and the overall performance of the equipment.

[0025] The number of connecting holes 111 is multiple, and the multiple connecting holes 111 are evenly distributed around the center position of the main shaft 100 to improve the reliability and stability of the connection between the main shaft and the drive unit, and improve the mechanical performance and reliability of the equipment. Specifically, the embodiment of this application improves the number of connecting holes 111 to 48.

[0026] It is understood that the energy storage centrifugal compressor also includes a connector, which passes through the connection hole 111 on the end flange section 110 and connects to the drive unit. For example, the connector can be a stud. Since the torque between the main shaft 100 and the drive unit will be evenly borne by the connector passing through the connection hole 111, or evenly borne by the 48 studs circumferentially engaged by the end flange section 110 and the coupling, in this embodiment, by reasonably setting the machining and assembly precision of the connection hole 111, the tolerance requirement of the connection hole 111 is φ13H7, and the positional tolerance between the connection hole 111 and the centerline of the main shaft 100 is φ0.05 mm. Therefore, while ensuring the transmission precision of both, the mechanical performance and reliability of the equipment are improved.

[0027] Furthermore, since the spindle 100 is provided with an end flange section 110, and the outer diameter of the end flange section 110 is relatively large, the outer diameter of the spindle 100 shaft end is also relatively large. This makes it impossible for the thrust disc of the spindle 100 to be installed in the conventional conical hydraulic form. Therefore, by directly machining the thrust disc section 120 on the spindle 100, it is ensured that the spindle 100 and the thrust bearing mating surface can be smoothly assembled.

[0028] Because the pressure difference between the inlet and outlet of some centrifugal compressors is extremely large, such as the energy storage offline compressor involved in the "Energy Storage Challenge and Leadership Liquid Compressed Air Energy Storage Demonstration Project" of Zhonglv Zhongke Qinghai, it adopts a compressor unit system solution with three-stage compression and direct centrifugal connection in the first stage. By improving and optimizing the structure of the main shaft 100 and the sealing fit, the compressor efficiency is improved. The energy storage centrifugal compressor in this project has a very large inlet and outlet pressure difference in the two-stage unit. Conventional comb-tooth seals as shaft end seals cannot meet the leakage control requirements. Therefore, in order to reduce shaft end leakage and improve efficiency, a carbon ring seal with extremely low leakage is adopted. To this end, the main shaft 100 of this application is equipped with a first sealing section 130 and a second sealing section 140, and the surface hardness of the first sealing section 130 and the second sealing section 140 meets HRC58-62. In this way, the first sealing section 130 and the second sealing section 140 can directly cooperate with the sealing carbon ring and meet the design requirements of the carbon ring seal. As a result, the shaft end seal of the main shaft 100 meets the leakage control requirements and simplifies the setting of the 12Cr13 shaft sleeve.

[0029] Therefore, the laser-hardened spindle 100 of the energy storage centrifugal compressor provided in this application embodiment, through a reasonable structural design of the spindle 100, includes an end flange section 110, a thrust plate section 120, a first sealing section 130, and a second sealing section 140. The end flange section 110 is used to connect to the drive unit, avoiding the installation difficulties and safety hazards associated with using a tapered hydraulic coupling structure to connect the spindle 100 and the drive unit in related technologies. This reduces assembly difficulty and improves equipment safety. By reasonably setting the machining accuracy, assembly accuracy, and positional accuracy of the connecting holes 111 on the end flange section 110, the mechanical performance and reliability of the equipment are improved. Furthermore, by providing the thrust plate section 120 on the spindle 100, the smooth assembly of the spindle 100 and the thrust bearing mating surface can be achieved while ensuring a relatively large outer diameter of the spindle end face. By setting a first sealing section 130 and a second sealing section 140 on the main shaft 100, the surface hardness of the first sealing section 130 and the second sealing section 140 meets HRC58-62, ensuring that the first sealing section 130 and the second sealing section 140 can directly cooperate with the sealing carbon ring, simplifying the setting of the 12Cr13 bushing material, and meeting the design requirements of the carbon ring seal. Thus, the shaft end seal of the main shaft 100 meets the leakage control requirements.

[0030] Due to the special nature of the main shaft 100 of the energy storage offline compressor, the main shaft 100 of the current energy storage centrifugal compressor is usually connected to the drive unit using a tapered hydraulic coupling structure. That is, there is currently no case where the main shaft 100 is provided with an end flange section 110 for direct connection to the drive unit. Therefore, there is a lack of precedents for the processing technology of the main shaft 100 with an end flange section 110.

[0031] Therefore, such as Figure 8 As shown in the embodiments of this application, a laser-hardened spindle machining process for an energy storage centrifugal compressor is also provided, for machining the aforementioned laser-hardened spindle 100 of the energy storage centrifugal compressor. The machining process includes: Step S810: The blank roughing, heat treatment, semi-finishing, stabilization, pre-quenching processing, laser quenching, and finishing are performed in sequence; wherein, the first sealing section and the second sealing section are subjected to local heat treatment by laser quenching.

[0032] In this embodiment, by rationally setting the machining process of the main shaft 100, the rough machining, heat treatment, semi-finishing, stabilization treatment, pre-quenching machining, laser quenching, and finishing processes are performed sequentially. This ensures that each section and each connecting hole 111 of the main shaft 100 meets the machining requirements, assembly requirements, positional requirements, and performance requirements. It also meets the assembly requirements and assembly accuracy with the drive unit, thrust bearing, and sealing carbon ring, ensuring the safety and overall performance of the energy storage centrifugal compressor.

[0033] Through the above-mentioned processing technology, it can be ensured that the multiple connecting holes 111 of the end flange section 110 are evenly distributed with the center position of the main shaft 100 as the center. The tolerance requirement of the connecting holes 111 is φ13H7, and the positional tolerance of the connecting holes 111 and the center line of the main shaft 100 is φ0.05 mm, so as to meet the connection requirements with the drive unit, so that each connecting part can bear the torque evenly and improve the safety of use.

[0034] The aforementioned processing technology ensures that the machining precision of the thrust disc section 120 meets the assembly requirements of the thrust bearing mating surface, thereby improving the overall performance of the machine.

[0035] Specifically, the first sealing section 130 and the second sealing section 140 are locally heat-treated by laser quenching so that the surface hardness of the first sealing section 130 and the second sealing section 140 meets HRC58-62, so as to meet the requirement of being able to directly fit with the sealing carbon ring.

[0036] In some possible embodiments provided in this application, the rough machining operation of the blank includes: Roughly machine center holes at both ends of the blank; The shaft diameter of each section is rough-machined using a lathe. The heat treatment chuck hole is wire-cut and then drilled using wire drilling.

[0037] This embodiment provides specific operational steps for rough machining of the blank. Among them, Figure 5 A schematic diagram of blank 200 is shown. Specifically, blank 200 can be a forging. Figure 6 A schematic diagram of the rough machining of the spindle is shown. The spindle blank 200 at both ends is supported by V-blocks, and the blank 200 is clamped by a pressure plate. The spindle is aligned according to the two end diameters, and the center holes 210 at both ends are machined, thus achieving the operation of rough machining the center holes 210 at both ends of the blank 200. The center holes 210 at both ends of the blank 200 are supported by lathe centers, and clamped with chucks. The spindle diameters of each section are machined according to the rough machining drawing of the spindle, thus achieving the operation of rough machining the spindle diameters of each section using a lathe. After marking the machining lines for the heat treatment chuck holes 211 according to the heat treatment rough machining drawing, the spindle 100 is supported at both ends by V-blocks, the workpiece is clamped by a pressure plate, and the heat treatment chuck holes 211 are machined by wire drilling, thus achieving the operation of wire drilling the heat treatment chuck holes 211.

[0038] In some possible embodiments provided in this application, the heat treatment operation includes: Normalizing was performed using a pit-type electric furnace, with a holding temperature of 860℃ for 9 hours followed by air cooling. Quenching was performed using a pit-type electric furnace, held at 850℃ for 9 hours, and then oil-cooled. Tempering was performed using a pit-type tempering furnace, with the furnace holding at 590℃ for 13 hours before air cooling.

[0039] In this embodiment, by reasonably setting the temperature and duration of normalizing, quenching, and tempering, heat treatment is performed on the workpiece to control the material's structure and properties, so as to meet the requirements of high precision, high strength, and wear resistance, thereby improving the performance of the spindle 100.

[0040] In some possible embodiments provided in this application, the semi-finishing operation includes: The center hole is semi-finished; The center hole is semi-finished; The first stand is machined on a lathe. The workpiece is supported by the first stand. After the test bar is cut, the center hole near the end of the test bar is remachined. The mechanical properties of the test bar were checked; Each section is semi-finished using a lathe with a first machining allowance of 2mm on one side. Perform ultrasonic testing on the workpiece.

[0041] This embodiment provides specific operational steps for semi-finishing. Specifically, V-blocks are used to support both ends of the workpiece, pressure plates are used to clamp the workpiece, and alignment is performed according to the shaft diameters at both ends of the spindle 100. Center holes 210 at both ends of the spindle 100 are drilled to perform semi-finishing on the center holes 210. The center holes 210 at both ends of the workpiece are supported by the two centers of the lathe, with chucks assisting in clamping. The first stand is turned according to the roughing drawing of the spindle, with the first stand close to the test bar 220. The center rest supports the workpiece through the first stand. Figure 6 The spindle roughing diagram shown is used to cut the test bar 220. Then, the center hole 210 near the end of the test bar 220 is re-machined to realize the operation of machining the first stand on the lathe, supporting the workpiece through the first stand, cutting the test bar 220, and then re-machining the center hole 210 near the end of the test bar 220.

[0042] Next, the test bar 220 undergoes a mechanical property check. Then, the spindle 100 is supported at both ends of the center holes 210 by the two centers of the lathe, with chucks assisting in clamping. Each section of the spindle 100 is machined according to the design drawings, leaving a first machining allowance, and the heat treatment chuck 210 is retained. Ultrasonic testing is then performed on the workpiece, utilizing ultrasonic non-destructive testing technology to accurately detect and evaluate internal and surface defects of the spindle 100. Understandably, after passing the inspection, subsequent process operations are carried out.

[0043] The first machining allowance can be a single-sided allowance of 2mm. By reasonably setting the first machining allowance, sufficient allowance is provided for subsequent machining operations and laser quenching heat treatment operations, which is beneficial to improving the performance of the spindle 100.

[0044] Among these steps, the mechanical property inspection of test bar 220 is a crucial step in evaluating the material and structural quality of spindle 100. Understandably, the operation of cutting test bar 220 can be repeated to inspect the mechanical properties of two test bars 220. This facilitates comparison of the data from the two tests, ensuring the accuracy of the test data. Specifically, as... Figure 6 As shown, there are two test bars 220 to facilitate two mechanical property checks and data comparison.

[0045] In some possible embodiments provided in this application, the stabilization process includes: using a pit-type tempering furnace, holding at 550°C for 26 hours, and then air cooling.

[0046] In this embodiment, by reasonably setting the temperature and duration during the stabilization process, the internal stress and dislocation slippage of the material can be further eliminated, the deformation and changes in the microstructure of the material can be reduced, thereby improving the deformation capacity of the material and improving the performance of the spindle 100.

[0047] In some possible embodiments provided in this application, the pre-quenching processing operations include: The second stand is machined on a lathe. The workpiece is supported by the second stand. After the heat treatment chuck is cut off, the end face is flattened and the center hole near the end of the heat treatment chuck is remachined. After hoisting the workpiece and turning it around, the end face of the workpiece away from the heat treatment chuck is flattened and the center hole is re-machined. Each section is machined using a lathe, with a second machining allowance. Each section is machined using a grinding machine, with a third machining allowance left. After magnetic particle testing, the surface is cleaned, ground, and rust-proofed. The hollow grooves at the root of the shaft at each end are machined by turning.

[0048] This embodiment provides specific operational steps for pre-quenching machining. First, clamp the spindle 100 at one end away from the heat treatment chuck 210 using a lathe four-jaw chuck and align it. Support the other end with a center. Machine a second support position at an appropriate spindle diameter near the four-jaw chuck and the heat treatment chuck 210. Then, support the workpiece with the center rest through the second support position. Cut off the heat treatment chuck 210 as shown in the diagram, flatten the end face, and re-drill the center hole 210 at the end of the workpiece where the heat treatment chuck 210 was cut off. Next, lift the workpiece to turn it around. Clamp the spindle 100 again at the one end near the heat treatment chuck 210 using a lathe four-jaw chuck and align it. Support the end of the spindle 100 away from the heat treatment chuck 210 with the lathe center. Support the workpiece with the center rest through the second support position. Flatten the end face of the end away from the heat treatment chuck 210 as shown in the diagram and re-drill the center hole 210. Next, the workpiece is supported by the center holes 210 at both ends of the lathe with two centers, and clamped with the aid of jaws. The shaft diameters of each section are machined according to the drawing, leaving a second machining allowance. The second machining allowance can be understood as the allowance for the shaft diameter to undergo "laser quenching heat treatment". Specifically, the shaft diameters of the first sealing section 130 and the second sealing section 140 need to leave a second machining allowance; the main spindle 100 also includes a threaded section, which is not machined with threads and needs to leave a second machining allowance; the shaft diameters of all other ends also leave a second machining allowance, as do the second machining allowances on each side of the two end faces of the thrust plate.

[0049] Then, the center holes 210 at both ends of the spindle 100 are clamped by the two centers of the grinding machine. According to the shaft diameter of "surface heat treatment" (i.e., the first sealing section 130 and the second sealing section 140) in the grinding drawing, each section is machined and a third machining allowance is left. Among them, the shaft diameter of the first sealing section 130 and the second sealing section 140 needs to leave a third machining allowance when grinding; the shaft diameter of each section with a roughness requirement of Ra1.6 and below is also left with a third machining allowance; the two end faces of the thrust plate section 120 are also left with a third machining allowance.

[0050] The setting of the second and third machining allowances can solve the problem that the machining allowance allocation scheme in the machining process of the conventional centrifugal compressor spindle 100 cannot meet the requirements of the laser quenching process. In this embodiment, by reasonably setting the first, second, and third machining allowances in appropriate processes, the machining process of the spindle 100 can meet the requirements of the laser quenching process, thereby ensuring the performance of the spindle 100.

[0051] Magnetic particle testing is a non-destructive testing technique primarily used to inspect surface and near-surface defects in ferromagnetic materials (such as steel and iron). During the machining process of spindle 100, this technique is used to ensure the quality and safety of spindle 100.

[0052] Cleaning, grinding, and rust prevention are key steps in ensuring the performance, accuracy, and lifespan of the spindle 100. Specifically, the cleaning process aims to remove impurities, oil, scale, and other residues from the surface of the spindle 100, laying the foundation for subsequent processing. Grinding significantly improves the surface hardness and fatigue strength of the workpiece, making the spindle 100 more resistant to wear and impact. Rust prevention extends the service life of the spindle 100.

[0053] Among these methods, by using a lathe to machine the empty tool grooves at the root of the shaft in each section, the tool can be easily withdrawn, reducing machining defects and improving machining accuracy.

[0054] Furthermore, the section also includes a threaded section, which is unthreaded. The second machining allowance for the shaft diameter of each section of the workpiece is as follows: For the shaft diameter of the first sealing section 130 and the second sealing section 140, the second machining allowance for the diameter is 0.30mm to 0.40mm, and the surface roughness reaches Ra3.2; For the shaft diameter of the threaded section, the second machining allowance for the diameter is 0.40mm to 0.60mm, and the thread is not machined, with a surface roughness reaching Ra3.2; For the shaft diameter of the remaining sections, the second machining allowance for the diameter is 0.60mm to 0.70mm; For both ends of the thrust disc, the second machining allowance for each side is 0.30mm to 0.40mm, with a surface roughness reaching Ra3.2.

[0055] Furthermore, the third machining allowance for the shaft diameter of each section of the workpiece is as follows: for the shaft diameter of the first sealing section 130 and the second sealing section 140, the third machining allowance for the diameter is 0.20±0.05mm; for the shaft diameter of the remaining sections with a roughness of Ra1.6 and below, the third machining allowance for the diameter is 0.50±0.05mm; for the two end faces of the thrust disc, the third machining allowance for each side is 0.20mm; the roughness is Ra3.2.

[0056] By reasonably setting the ranges of the first machining allowance, the second machining allowance, and the third machining allowance, it can be ensured that the machining process of the spindle 100 meets the requirements of the laser quenching process, thereby ensuring the performance of the spindle 100.

[0057] In some possible embodiments provided in this application, the laser quenching operation can be understood as performing local heat treatment on the first sealing section 130 and the second sealing section 140.

[0058] Specifically, after laser quenching, the workpiece has the advantages of significantly improved surface hardness and wear resistance, minimal workpiece deformation, enhanced fatigue resistance and corrosion resistance, efficient and environmentally friendly process characteristics, and precise and controllable local treatment, so that the surface hardness of the first sealing section 130 and the second sealing section 140 meets HRC58-62.

[0059] It is understandable that, due to the reasonable allocation of machining allowances in the aforementioned process, such as setting a first machining allowance, a second machining allowance, and a third machining allowance in different processes, the machining process of the spindle 100 can meet the requirements of the laser quenching process, thereby ensuring the performance of the spindle 100.

[0060] In some possible implementations provided in this application, the finishing operations include: The section also includes bearing sections near the two ends. The shaft diameter of the two bearing sections is used as a reference for dial indicator alignment. After the centers at both ends are precision machined on a lathe, the shaft diameter of each section is aligned using dial indicator alignment. The shaft diameter of each section is precision ground using a grinding machine, and the two end faces of the thrust disc are also precision ground. The external threads of the threaded section are precision machined on a lathe, the root fillets and end chamfers of each shaft are machined, the shaft diameter of the vibration measurement zone of the bearing section is rolled, and the end face, end face stop and outer circle of the end flange section are precision machined. Using a boring machine, with the shaft diameters of the two bearing sections as the reference, the dial indicator is used for alignment. The end face and outer circle of the end flange section are used as the reference for drilling, reaming, and boring the connecting holes. After magnetic particle testing, the remaining machining holes and grooves are marked, the holes are drilled according to the marked lines, the grooves are milled, and then demagnetized and comprehensively tested.

[0061] This embodiment provides specific operational steps for precision machining. Specifically, the spindle 100 includes bearing sections 150 near the two main sections. Using the shaft diameter of the bearing sections 150 on both sides as a reference, the allowable tolerance for calibration using a dial indicator is not less than 0.005mm. The centers at both ends are then machined. Figure 7 The simplified process diagram shown illustrates the dial indicator inspection of the spindle after laser hardening. This process involves dial indicator testing of the shaft diameter at various sections of the entire spindle. Figure 7 The phrase "heat treatment within the surface" can be understood as localized heat treatment via laser quenching, which characterizes the first sealing section 130 and the second sealing section 140. Figure 7 The numbers in the table can be understood as performing a dial indicator test on each segment in numerical order. Next, the center holes 210 at both ends of the spindle 100 are clamped by the two centers of the grinding machine, and then... Figure 7The shaft diameters of sections with a diameter of Ra1.6 and below are precision ground; the two end faces of the thrust disc section 120 are ground to meet the design drawing requirements. Then, the external threads of the threaded sections are precision-finished using a lathe; the root fillets and end chamfers of each section of the spindle 100 are machined and trimmed; the shaft diameter of the vibration measuring area 151 of the bearing section 150 is rolled; and the end face, end face stop, and outer circle of the end flange section 110 are precision-machined. Next, the boring machine supports the sealing shaft diameters at both ends of the spindle 100 with V-blocks. Using the shaft diameter of the bearing section 150 of the spindle 100 as a reference, a dial indicator is used for alignment, with a tolerance of no more than 0.005mm. The workpiece is then clamped by a pressure plate. Using the end face and outer circle of the end flange section 110 as references, the center is aligned using a dial indicator at three points on the outer circle of the end flange section 110. After checking the center position accuracy with a Renishaw probe, each connecting hole 111 of the end flange section 110 is drilled and enlarged. Then, each connecting hole 111 is reamed to meet the drawing requirements. Next, magnetic particle inspection is performed; machining lines for the remaining holes and grooves on the spindle 100 are drawn; according to the drawing and lines, each hole is drilled and each groove is milled to meet the design drawing requirements. Finally, after demagnetization, a comprehensive inspection is performed. The comprehensive inspection may include runout testing, dimensional inspection, inter-process inspection, and overall inspection of the spindle 100. Once confirmed to be error-free, it is ready for assembly.

[0062] Understandably, after demagnetizing and performing runout testing, the spindle 100 can be cleaned, re-grinded, and rust-proofed again to ensure its performance, accuracy, and lifespan.

[0063] Furthermore, the spindle machining process provided in this application embodiment can include an inspection step after some machining operations to ensure the accuracy of those operations. For example, each machining step can be inspected according to the simplified process diagram to ensure error-free machining and improve the accuracy of subsequent machining.

[0064] Specifically, such as Figure 3 and Figure 4 This is a schematic diagram illustrating the process requirements for a laser-quenched spindle of a centrifugal compressor, as provided in an embodiment of this application.

[0065] An embodiment of this application also provides an energy storage centrifugal compressor, including: a drive unit and the aforementioned energy storage centrifugal compressor laser quenching spindle 100. Since the energy storage centrifugal compressor includes the aforementioned energy storage centrifugal compressor laser quenching spindle 100, it has all the technical effects of the aforementioned energy storage centrifugal compressor laser quenching spindle 100, which will not be described in detail here.

[0066] The drive unit is connected to the connecting hole 111 of the flange section of the laser quenching spindle 100 of the energy storage centrifugal compressor.

[0067] Specifically, this application's embodiment takes the laser-quenched spindle 100 of the second-stage centrifugal compressor in the Golmud Energy Storage Project in Qinghai as an example, and provides a detailed explanation in conjunction with the above processing scheme and process flow. The Zhonglv Zhongke Qinghai "Energy Storage Demonstration Project" is the world's largest liquid compressed air energy storage project. This project features design requirements such as large flow rate, high pressure, and high power; there are no projects of similar scale domestically or internationally, making the compressor structure design extremely challenging. Given the lack of comparable structures, Shenyang Blower Works Group proposed a three-stage compression and first-stage centrifugal direct-drive compressor unit system solution, improving compressor efficiency by optimizing the spindle structure and sealing fit. All units in this project have completed mechanical operation tests and passed the first trial run. The aerodynamic performance test of the units has also been completed, with aerodynamic efficiency and stable operating range meeting or exceeding design specifications, reaching international leading levels. The "60MW Liquid Air Energy Storage System and Key Equipment Based on Deep Cryogenic Cascade Cold Storage Technology," in which Shenyang Blower Works Group participated in the research, was successfully selected for the "Fourth Batch of Major Technical Equipment List for the First Set in the Energy Sector." in, Figure 3 and Figure 4 A schematic diagram of the process requirements for the laser-quenched spindle 100 of the two-stage centrifugal compressor of this project is shown, and the specific processing flow is as follows.

[0068] First, the rough machining operation of the blank can be understood as the sequential operation of drilling, rough turning, scribing, and drilling, as follows.

[0069] Drilling: Use V-blocks to support the two ends of the spindle blank 200, press the blank 200 with pressure plates, align with the two ends of the spindle, and machine the center holes 210 at both ends.

[0070] Rough turning: The lathe center supports the center holes 210 at both ends of the spindle blank 200, and the chuck assists in clamping. The shaft diameter of each section is machined according to the rough machining drawing of the spindle.

[0071] Inspection: Inspect the workpiece according to the spindle roughing drawing to ensure that the machining is error-free and improve the accuracy of subsequent machining.

[0072] Marking: Mark the machining line 211 for the heat treatment chuck hole according to the rough machining drawing of heat treatment.

[0073] Drilling: Support both ends of the spindle 100 with V-blocks, press the workpiece with pressure plates, and drill the heat treatment chuck hole 211 by wire drilling.

[0074] Second, the heat treatment operations are as follows: normalizing is carried out in a pit-type electric furnace, held at 860℃ for 9 hours and then air-cooled; quenching is carried out in a pit-type electric furnace, held at 850℃ for 9 hours and then oil-cooled; tempering is carried out in a pit-type tempering furnace, held at 590℃ for 13 hours and then air-cooled.

[0075] Third, semi-finishing operations can be understood as sequentially performing drilling, turning, performance testing, turning, and super-probing operations, as detailed below.

[0076] Drilling: Use V-blocks to support both ends of the workpiece, press the workpiece with pressure plates, align the shaft diameters of the two shaft ends, and drill the center holes 210 at both ends of the spindle 100 to perform semi-finishing of the center holes 210.

[0077] Turning: The center holes 210 at both ends of the workpiece are supported by the two centers of the lathe. The chuck assists in clamping. Turn the first stand according to the roughing drawing. The first stand is close to the test bar 220. The center rest supports the workpiece through the first stand. Cut the test bar 220 according to the spindle roughing drawing. Then, re-machine the center hole 210 at the end of the workpiece close to the test bar 220.

[0078] Performance testing: Mechanical properties of test bar 220 are tested.

[0079] Lathe: The spindle 100 is supported by two centers of the lathe with the center holes 210 at both ends. The chuck assists in clamping. Each section of the spindle 100 is machined according to the design drawing and a first machining allowance is left. The first machining allowance is a single-sided allowance of 2mm. The surface roughness reaches Ra3.2. The heat treatment chuck 210 is retained.

[0080] Ultrasonic testing: Performing ultrasonic testing on the workpiece, that is, using ultrasonic non-destructive testing technology to accurately detect and evaluate the internal and surface defects of the spindle 100.

[0081] Fourth, stabilize the operation by using a pit-type tempering furnace, holding at 550℃ for 26 hours, and then air cooling.

[0082] Fifth, the pre-quenching processing operations can be understood as performing the following operations in sequence: turning, inspection, grinding, special inspection, magnetic particle testing, clamping, turning, and inspection.

[0083] Turning: First, clamp the spindle 100 at the end furthest from the heat treatment chuck 210 using the lathe's four-jaw chuck and align it. Support the other end with the center. Turn the second stand at an appropriate spindle diameter near the four-jaw chuck and the heat treatment chuck 210. Then, support the workpiece with the center rest through the second stand and cut off the heat treatment chuck 210 as shown in the diagram, flattening the end face. Re-drill the center hole 210 at the end of the workpiece where the heat treatment chuck 210 was cut off. Next, lift the workpiece to turn it around. Clamp the spindle 100 again at the end furthest from the heat treatment chuck 210 using the lathe's four-jaw chuck and align it. Support the end of the spindle 100 furthest from the heat treatment chuck 210 with the lathe's center. Support the workpiece with the center rest through the second stand. Flatten the end face of the end furthest from the heat treatment chuck 210 as shown in the diagram and re-drill the center hole 210. Next, the center holes 210 at both ends of the workpiece are supported by the two centers of the lathe, and the workpiece is clamped with the assistance of the chucks. The shaft diameters of each section are machined according to the drawing, leaving a second machining allowance. The second machining allowance can be understood as the allowance left for the shaft diameter to undergo "surface heat treatment (i.e., the first sealing section 130 and the second sealing section 140)".

[0084] The section also includes a threaded section, which has no machined threads. The second machining allowance for the shaft diameter of each section of the workpiece is as follows: For the shaft diameter of the first sealing section 130 and the second sealing section 140, the second machining allowance for the diameter is 0.30mm to 0.40mm, and the surface roughness reaches Ra3.2; For the shaft diameter of the threaded section, the second machining allowance for the diameter is 0.40mm to 0.60mm, and the threads are not machined, with a surface roughness reaching Ra3.2; For the shaft diameter of the remaining sections, the second machining allowance for the diameter is 0.60mm to 0.70mm; For both ends of the thrust disc section 120, the second machining allowance for each side is 0.30mm to 0.40mm, with a surface roughness reaching Ra3.2.

[0085] Inspection: Check according to the design drawings and process requirements to ensure the accuracy of subsequent machining and improve the performance of the spindle 100. Understandably, if the inspection fails, corrections are required until the inspection is passed before proceeding with subsequent process operations.

[0086] Grinding: Clamp the center holes 210 at both ends of the spindle 100 with the two centers of the grinding machine. Machining each section according to the shaft diameter of "surface heat treatment (i.e., first sealing section 130, second sealing section 140)" in the grinding drawing, leaving a third machining allowance. The third machining allowance of the shaft diameter of each section of the workpiece is as follows: For the shaft diameter of the first sealing section 130 and the second sealing section 140, the third machining allowance of the diameter is 0.20±0.05mm; for the shaft diameter of the remaining sections with a roughness of Ra1.6 and below, the third machining allowance of the diameter is 0.50±0.05mm; for the two end faces of the thrust plate, the third machining allowance of each side is 0.20mm; the roughness is Ra3.2.

[0087] Special inspection: Check the shaft diameter dimensions of the first sealing section 130 and the second sealing section 140 according to the design drawings.

[0088] Magnetic particle testing: Magnetic particle testing is a non-destructive testing technique mainly used to inspect surface and near-surface defects in ferromagnetic materials (such as steel and iron). In the machining process of spindle 100, this technique is used to ensure the quality and safety of spindle 100.

[0089] Pliers: Cleaning, grinding, and rust prevention.

[0090] Lathe: The hollow grooves at the root of each axle are machined using a lathe.

[0091] Inspection: Check according to the drawings and process requirements to ensure machining accuracy.

[0092] Sixth, laser quenching operation.

[0093] Seventh, the finishing operation can be performed in sequence as turning, special inspection, grinding, special inspection, magnetic particle testing, clamping, turning, and inspection.

[0094] The main shaft 100 section includes the bearing section 150 near the two main sections. Using the shaft diameter of the bearing sections 150 on both sides as a reference, the dial indicator calibration tolerance should be no less than 0.005mm. The center points at both ends are machined; dial indicator testing is performed according to... Figure 7 The simplified process diagram shown is for dial indicator testing of the spindle diameter after laser quenching. The diameter of each section of the spindle is tested using dial indicator.

[0095] Specialized inspection: tabulation test, recording tabulation test data.

[0096] Grinding: Clamp the two centers of the grinding machine into the center holes 210 at both ends of the spindle 100, and press... Figure 3 The spindle design drawing shows the precision grinding of the shaft diameter of sections with a diameter of Ra1.6 and below; the two end faces of the thrust disc section 120 are ground to achieve... Figure 3 The design drawing requirements are shown.

[0097] Machining: The external thread of the threaded section is machined using a lathe to meet the design drawing requirements; the root fillet and end chamfer of the bearing platform are trimmed; the shaft diameter of the vibration measurement zone 151 in bearing section 150 is rolled to achieve the required specifications. Figure 3 The design drawing shown requires precision machining of the end face, end face stop, and outer circle of the end flange section 110.

[0098] Boring: Support the sealing shaft diameters at both ends of the main spindle 100 with V-blocks. Use the shaft diameter of the bearing section 150 of the main spindle 100 as a reference, and use a dial indicator to align it, with a tolerance of no more than 0.005mm. Press the workpiece with a pressure plate. Use the end face and outer circle of the end flange section 110 as a reference, and use a dial indicator to align the center using three points on the outer circle of the end flange section 110. After checking the center position accuracy with a Renishaw probe, drill and enlarge each connecting hole 111 of the end flange section 110, and then ream each connecting hole 111 to ensure they are all aligned. Figure 3 and Figure 4 The design drawing requirements are shown.

[0099] Magnetic particles: Magnetic particle detection.

[0100] Inspection: Check according to the design drawings and process requirements.

[0101] Scribing: Scribing the remaining machined holes and grooves, such as scribing the machining lines for each groove, the hexagonal machining lines for the shaft end, and the machining lines for each hole.

[0102] Milling: Mill each groove according to the drawing and lines, mill the hexagon according to the drawing and lines, and drill pin holes.

[0103] Drill: Drill the remaining holes according to the diagram and lines.

[0104] Check: Check according to the diagram.

[0105] Demagnetize.

[0106] Perform runout detection on the workpiece.

[0107] Specialized inspection: Check the dimensions of each part according to the design drawings and process requirements.

[0108] Pliers: Cleaning, grinding, and rust prevention.

[0109] Inspection: Inter-process inspection, comprehensive inspection.

[0110] Rotor assembly is about to begin.

[0111] In the description of this application, the term "multiple" refers to two or more. Unless otherwise expressly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on 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. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0112] In the description of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0113] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0114] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0115] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A laser-hardened spindle for an energy storage centrifugal compressor, characterized in that, The main shaft is provided with multiple sections along the axial direction. Each section includes at least an end flange section, a thrust plate section, a first sealing section, and a second sealing section. The end flange section has a connection hole for connecting with the drive unit of the energy storage centrifugal compressor. The thrust plate section is configured to cooperate with the thrust bearing of the energy storage centrifugal compressor. The first sealing section and the second sealing section are configured to directly cooperate with the sealing carbon ring of the energy storage centrifugal compressor. The plurality of connecting holes are evenly distributed with the center of the spindle as the center, the tolerance requirement for the connecting holes is φ13H7, and the positional tolerance of the connecting holes relative to the center line of the spindle is φ0.05 mm. The surface hardness of the first sealing section and the second sealing section meets HRC58-62.

2. A laser-quenched spindle machining process for an energy storage centrifugal compressor, characterized in that, The laser-hardened spindle for processing the energy storage centrifugal compressor according to claim 1, wherein the processing technology includes: The sequence of processes is: rough machining of the blank, heat treatment, semi-finishing, stabilization treatment, pre-quenching machining, laser quenching, and finishing. Specifically, the first sealing section and the second sealing section are subjected to local heat treatment through the laser quenching operation.

3. The laser-quenched spindle machining process for energy storage centrifugal compressors according to claim 2, characterized in that, The rough machining operations for the blank include: Roughly machine center holes at both ends of the blank; The shaft diameter of each section is rough-machined using a lathe. The heat treatment chuck hole is wire-cut, and the heat treatment chuck hole is machined by wire drilling.

4. The laser-quenched spindle machining process for energy storage centrifugal compressors according to claim 3, characterized in that, The semi-finishing operations include: The center hole is semi-finished; The first stand is machined using a lathe. The workpiece is supported by the first stand. After the test bar is cut, the center hole near the end of the test bar is remachined. The mechanical properties of the test bar were checked. Each of the aforementioned sections is semi-finished using a lathe, with a first machining allowance remaining. The first machining allowance is a single-sided allowance of 2mm. The workpiece is subjected to ultrasonic testing.

5. The laser-quenched spindle machining process for energy storage centrifugal compressors according to claim 4, characterized in that, The pre-quenching processing operations include: The workpiece is supported by the second stand on a lathe. After the heat treatment chuck is cut off, the end face is flattened and the center hole near the end of the heat treatment chuck is re-machined. The workpiece is hoisted and turned around. After the end of the workpiece away from the heat treatment chuck is flattened, the center hole is remachined. Each of the aforementioned sections is machined using a lathe, with a second machining allowance remaining; Each of the aforementioned sections is machined using a grinding machine, with a third machining allowance remaining; After magnetic particle testing, the surface is cleaned, ground, and rust-proofed. The hollow grooves at the root of the shaft of each of the aforementioned sections are machined by turning.

6. The laser-quenched spindle machining process for energy storage centrifugal compressors according to claim 5, characterized in that, The process of machining each segment on a lathe and leaving a second machining allowance includes: The segment also includes a threaded segment, which is unthreaded, and the second machining allowance of the shaft diameter of the threaded segment is 0.40 mm to 0.60 mm. The second machining allowance for the shaft diameter of the first sealing section and the second sealing section is 0.30 mm to 0.40 mm; The machining allowance for the remaining shaft diameter segments is 0.60 mm to 0.70 mm; The second machining allowance on each side of the two end faces of the thrust disc section is 0.30 mm to 0.40 mm.

7. The laser-hardened spindle machining process for energy storage centrifugal compressors according to claim 5, characterized in that, The process of machining each segment with a grinding machine and leaving a third machining allowance includes: The third machining allowance for the shaft diameter of the first sealing section and the second sealing section is 0.20±0.05mm, and the third machining allowance for the shaft diameter of the remaining sections is 0.50±0.05mm. The third machining allowance on one side of each of the two end faces of the thrust disc section is 0.20 mm.

8. The laser-hardened spindle machining process for energy storage centrifugal compressors according to claim 6, characterized in that, The finishing operations include: The segment also includes bearing segments near the two ends. The shaft diameters of the two bearing segments are used as a reference for dial indicator calibration. After the centers at both ends are precision machined on a lathe, the shaft diameters of each segment are calibrated using dial indicator calibration. The shaft diameter of each section is precision ground using a grinding machine, and the two end faces of the thrust disk are also precision ground. The external threads of the threaded section are precision machined on a lathe, the root fillets and end chamfers of each of the shaft platforms are machined, the shaft diameter of the vibration measurement zone of the bearing section is rolled, and the end face, end face stop and outer circle of the end flange section are precision machined. Using a boring machine, with the shaft diameters of the two bearing sections as a reference, a dial indicator is used for alignment. With the end face and outer circle of the end flange section as a reference, the connecting holes are drilled, enlarged, and reamed. After magnetic particle testing, the remaining machining holes and grooves are marked, the machining holes are drilled according to the marked lines, the machining grooves are milled, demagnetized, and then comprehensively tested.

9. The laser-hardened spindle machining process for an energy storage centrifugal compressor according to any one of claims 2 to 8, characterized in that, The heat treatment includes: Normalizing was performed using a pit-type electric furnace, with a holding temperature of 860℃ for 9 hours followed by air cooling. Quenching was performed using a pit-type electric furnace, held at 850℃ for 9 hours, and then oil-cooled. Tempering is performed using a pit-type tempering furnace, holding at 590℃ for 13 hours followed by air cooling; and / or, The stabilization process includes: using a pit-type tempering furnace, holding at 550℃ for 26 hours, and then air cooling.

10. An energy storage centrifugal compressor, characterized in that, include: The drive unit and the laser-hardened spindle of the energy storage centrifugal compressor as described in claim 1.

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