A welding method for a dynamic-static pressure hybrid radial gas foil bearing gas supply pipe and a circular arc top foil

Abstract

The application discloses a welding method for a gas supply pipe and a circular-arc top foil of a dynamic-static pressure hybrid radial gas foil bearing, and solves the problem of coating peeling caused by the welding protrusion of the welding spot of the gas supply pipe and the top foil, which leads to the wear of the rotor and the bearing. The gas supply steel pipe and the dynamic-static pressure hybrid radial gas foil bearing are tightly attached after being aligned at the gas supply hole of the top foil, the circular pipe opening of the gas supply pipe is overlapped with the gas supply hole of the top foil, laser welding is performed on the inner surface of the circular-arc top foil, the welding position is at the contact position of the top foil and the pipe opening of the gas supply pipe, secondary welding is performed on the outer surface of the top foil, the welding position is at the contact position of the pipe opening of the gas supply pipe and the top foil, the welding wire is wound, and laser melting is performed on the welding wire to improve the welding strength and the sealing performance, ensure the firm welding of the gas supply pipe and the top foil, prevent the gas from leaking through the gap, solve the problem of the welding protrusion of the welding spot on the inner surface of the top foil after the previous welding, improve the processing quality, and reduce the wear of the bearing and the rotor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foil bearing processing, and particularly relates to a welding method of a dynamic-static pressure mixed radial gas foil bearing gas supply pipe and a circular arc top foil. BACKGROUND

[0002] The gas lubricated bearing has the advantages of small viscosity of gas lubricating medium, small friction, high rotation accuracy, low power consumption, etc., and has a wide application prospect in the high-precision field and turbine machinery. The dynamic-static pressure mixed radial gas foil bearing is a new type of gas bearing formed by introducing a gas supply pressure into the dynamic pressure radial gas foil bearing. The dynamic-static pressure mixed radial gas foil bearing is obtained by opening a gas supply hole on the top foil of the dynamic pressure radial gas foil bearing, and welding the pipe opening of the gas supply pipe on the back surface of the top foil in the wave foil gap. However, the manufacturing process of the dynamic-static pressure mixed radial gas foil bearing is not mature, especially the welding technology of the top foil and the gas supply pipe is not mature. The top foil is thin, and the welding point protrusion is easily generated on the inner surface of the top foil, which causes the bearing coating to fall off and the rotor and the bearing to be abraded.

[0003] In order to improve the manufacturing process of the dynamic-static pressure mixed radial gas foil bearing, improve the bearing accuracy and quality, and reduce the abrasion of the bearing and the rotor, a new laser welding method is provided. The welding is performed on the inner surface of the top foil, and the welding position is at the gas supply hole of the top foil, so that the welding point protrusion is outward and does not abrade the rotor. Then, secondary welding is performed, and the welding position is at the contact position between the gas supply pipe and the outer surface of the top foil. The welding is performed by laser melting of the welding wire, so as to ensure the sealing property and improve the welding strength. SUMMARY

[0004] In view of the above-mentioned problem that the welding of the gas supply pipe and the top foil generates the welding point protrusion, the coating falls off, and the abrasion of the rotor and the bearing is caused, the purpose of the present application is to provide a welding method of a dynamic-static pressure mixed radial gas foil bearing gas supply pipe and a circular arc top foil.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] A welding method of a dynamic-static pressure mixed radial gas foil bearing gas supply pipe and a circular arc top foil, comprising the following steps.

[0007] S1: placing the gas supply pipe 4 below the laser 5 and clamping the gas supply pipe 4;

[0008] S2: placing the top foil 1 between the gas supply pipe 4 and the laser 5, the inner surface of the top foil 1 facing the laser 5, and the outer surface of the top foil 1 abutting against the end of the gas supply pipe 4;

[0009] S3: adjusting the gas supply hole of the top foil 1, the gas supply pipe 4 and the laser 5 to be located on the same central axis, and clamping the top foil 1.

[0010] S4: welding the inner surface of the top foil 1 at the contact between the top foil 1 and the gas supply tube 4 by the laser 5;

[0011] S5: winding the welding wire 6 at the contact between the outer surface of the top foil 1 and the gas supply tube 4;

[0012] S6: melting the welding wire 6 by the laser 5 to weld the top foil 1 and the gas supply tube 4 by the welding wire 6;

[0013] S7: checking the welding strength at the contact between the top foil 1 and the gas supply tube 4, if there is a virtual welding spot at the contact between the top foil 1 and the gas supply tube 4, adding the welding wire 6 at the virtual welding spot and repeating the step S6, if there is no virtual welding spot at the contact between the top foil 1 and the gas supply tube 4, going to the next step;

[0014] S8: polishing and polishing the contact between the top foil 1 and the gas supply tube 4.

[0015] The welding method of the gas supply tube and the circular arc top foil of the hybrid dynamic and static pressure radial gas foil bearing, wherein at least one gas supply hole is formed on the top foil 1 in step S2.

[0016] The welding method of the gas supply tube and the circular arc top foil of the hybrid dynamic and static pressure radial gas foil bearing, wherein the diameter of the gas supply hole is smaller than the diameter of the gas supply tube 4.

[0017] The welding method of the gas supply tube and the circular arc top foil of the hybrid dynamic and static pressure radial gas foil bearing, wherein the diameter of the gas supply hole is equal to the diameter of the gas supply tube 4.

[0018] The welding method of the gas supply tube and the circular arc top foil of the hybrid dynamic and static pressure radial gas foil bearing, wherein the top foil 1 is arranged in the sleeve 3, and a plurality of first installation sliding grooves matched with the gas supply tube 4 are formed on the sleeve 3.

[0019] The welding method of the gas supply tube and the circular arc top foil of the hybrid dynamic and static pressure radial gas foil bearing, wherein the corrugated foil 2 is arranged between the top foil 1 and the sleeve 3, and a plurality of second installation sliding grooves matched with the gas supply tube 4 are formed on the corrugated foil 2.

[0020] The welding method of the gas supply tube and the circular arc top foil of the hybrid dynamic and static pressure radial gas foil bearing, wherein the gas supply tube 4 in step S1 is vertically arranged.

[0021] The welding method of the gas supply tube and the circular arc top foil of the hybrid dynamic and static pressure radial gas foil bearing, wherein the gas supply tube 4 in step S1 is a gas supply steel tube.

[0022] The welding method of the dynamic-static pressure mixed radial gas foil bearing gas supply pipe and the circular arc top foil, wherein the distance between the welding spot position of the inner surface of the top foil 1 and the center axis of the gas supply hole is not more than the outer diameter radius of the gas supply pipe 4.

[0023] The present application has the following advantages compared with the prior art:

[0024] (1) In the present application, the circular arc top foil and the gas supply pipe are first fastened, and then welded on the inner surface of the top foil, which solves the problem of forming a welding spot protrusion on the inner surface of the top foil after external direct welding, reduces the problem of top foil inner surface coating falling caused by processing quality, and reduces the problem of bearing and rotor wear caused by protrusions.

[0025] (2) In the present application, the top foil outer surface and the gas supply pipe port outer diameter contact are welded by laser melting welding wire, which strengthens the connection strength of the top foil and the gas supply pipe, ensures the sealing quality of the welding position, and solves the problem of gas leakage at the welding position. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a step schematic diagram of a welding method of a dynamic-static pressure mixed radial gas foil bearing gas supply pipe and a circular arc top foil of the present application.

[0027] Figure 2 is a structure schematic diagram of a top foil of a dynamic-static pressure mixed radial gas foil bearing of the present application.

[0028] Figure 3 is a structure schematic diagram of a corrugated foil of a dynamic-static pressure mixed radial gas foil bearing of the present application.

[0029] Figure 4 is a structure schematic diagram of a sleeve of a dynamic-static pressure mixed radial gas foil bearing of the present application.

[0030] Figure 5 is a structure schematic diagram of a gas supply pipe of a dynamic-static pressure mixed radial gas foil bearing of the present application.

[0031] Figure 6 is a structure schematic diagram of a dynamic-static pressure mixed radial gas foil bearing of the present application.

[0032] Figure 7 is a welding position schematic diagram of a welding method of a dynamic-static pressure mixed radial gas foil bearing gas supply pipe and a circular arc top foil of the present application.

[0033] Figure 8 is an embodiment schematic diagram of a welding method of a dynamic-static pressure mixed radial gas foil bearing gas supply pipe and a circular arc top foil of the present application.

[0034] In the drawing: 1, top foil; 2, corrugated foil; 3, sleeve; 4, gas supply pipe; 5, laser; 6, welding wire. DETAILED DESCRIPTION

[0035] The application will be further described below in conjunction with the drawing and specific embodiments, but not as a limitation of the application.

[0036] Please refer to Figures 1 to 8 The drawing shows a welding method of a dynamic-static pressure mixed radial gas foil bearing gas supply pipe and a circular arc top foil, which comprises:

[0037] S1: Place the gas supply pipe 4 below the laser 5 and clamp the gas supply pipe 4;

[0038] S2: Place the top foil 1 between the gas supply pipe 4 and the laser 5, with the inner surface of the top foil 1 facing the laser 5 and the outer surface of the top foil 1 abutting the end of the gas supply pipe 4;

[0039] S3: Adjust the gas supply hole of the top foil 1, the gas supply pipe 4 and the laser 5 to be on the same center axis, and clamp the top foil 1;

[0040] S4: Perform a first welding on the inner surface of the top foil 1 at the contact between the top foil 1 and the gas supply pipe 4 by the laser 5;

[0041] S5: Wrap the welding wire 6 at the contact between the outer surface of the top foil 1 and the gas supply pipe 4;

[0042] S6: Melt the welding wire 6 by the laser emitted by the laser 5, and perform a second welding on the top foil 1 and the gas supply pipe 4 by the welding wire 6;

[0043] S7: Check the welding strength at the contact between the top foil 1 and the gas supply pipe 4, if there is a virtual welding point at the contact between the top foil 1 and the gas supply pipe 4, add the welding wire 6 at the virtual welding point and repeat the above step S6, if there is no virtual welding point at the contact between the top foil 1 and the gas supply pipe 4, proceed to the next step;

[0044] S8: Polish and polish the contact between the top foil 1 and the gas supply pipe 4.

[0045] Further, in a preferred embodiment, at least one gas supply hole is provided on the top foil 1 in step S2.

[0046] Further, in a preferred embodiment, the diameter of the gas supply hole is smaller than the diameter of the gas supply pipe 4.

[0047] Further, in a preferred embodiment, the diameter of the gas supply hole is equal to the diameter of the gas supply pipe 4.

[0048] Further, in a preferred embodiment, the top foil 1 is arranged in the sleeve 3, and the sleeve 3 is provided with a plurality of first installation sliding grooves matched with the gas supply pipe 4.

[0049] Further, in a preferred embodiment, a corrugated foil 2 is arranged between the top foil 1 and the sleeve 3, and the corrugated foil 2 is provided with a plurality of second installation sliding grooves matched with the gas supply pipe 4.

[0050] Further, in a preferred embodiment, the gas supply pipe 4 in step S1 is arranged vertically.

[0051] Further, in a preferred embodiment, the gas supply pipe 4 in step S1 is a gas supply steel pipe.

[0052] Further, in a preferred embodiment, the distance between the welding point position on the inner surface of the top foil 1 and the center axis of the gas supply hole in step S4 does not exceed the outer diameter radius of the gas supply pipe 4.

[0053] The above is only a preferred embodiment of the present application, and does not limit the implementation and protection scope of the present application.

[0054] The present application further has the following implementation based on the above:

[0055] In a further embodiment of the present application, a welding method of a dynamic-static pressure mixed radial gas foil bearing comprises: aligning and tightly abutting a top foil 1 of a dynamic-static pressure mixed gas foil bearing and a gas supply steel pipe, using a laser emitter to first perform welding on the inner surface of the top foil 1, then performing secondary welding by winding a welding wire 6 at the contact position between the gas supply steel pipe and the outer surface of the top foil 1, and polishing and polishing after welding.

[0056] In a further embodiment of the present application, the diameter of the gas supply hole on the top foil 1 of the dynamic-static pressure mixed radial gas foil bearing is less than or equal to the diameter of the gas supply pipe 4.

[0057] In a further embodiment of the present application, the center of the gas supply steel pipe port is aligned with the center of the gas supply hole on the top foil 1, and the axis of the gas supply pipe 4 is perpendicular to the axis of the top foil 1.

[0058] In a further embodiment of the present application, the gas supply steel pipe is tightly abutted with the outer surface of the top foil 1, and the top foil 1 and the gas supply steel pipe are clamped by a clamp to ensure that no position deviation occurs during welding.

[0059] In a further embodiment of the present application, the fixed top foil 1 is placed on a workbench with the inner surface of the top foil 1 facing upward, and the first welding is performed on the inner surface of the top foil 1.

[0060] In further embodiments of the present application, the laser 5 is above the inner surface of the top foil 1, and the welding points are formed on the inner surface of the top foil 1, and the welding points are located near the gas supply hole on the top foil 1, and the farthest distance between the welding points and the center of the gas supply hole should not exceed the length of the outer diameter of the gas supply tube 4.

[0061] In further embodiments of the present application, the welding points should be as close as possible to ensure the welding quality, but should not be welded for a long time at the same position to cause welding through.

[0062] In further embodiments of the present application, the welding wire 6 should be wound around the contact position between the outer surface of the top foil 1 and the outer diameter of the gas supply tube 4. The laser melts the welding wire 6 to perform welding, and the top foil 1 and the gas supply tube 4 should not be welded through.

[0063] In further embodiments of the present application, the welding position is polished and polished after welding to ensure that the welding position does not affect the assembly of the top foil 1 in the bearing and does not affect the movement between the top foil 1 and the corrugated foil 2 and the sleeve 3.

[0064] In further embodiments of the present application, the laser 5 is a laser emitter for welding the gas supply tube 4 and the top foil 1 by laser.

[0065] In further embodiments of the present application, the laser welding method is as shown in Figure 1 , and includes the following steps:

[0066] Step 101: align and fix the gas supply tube 4 and the top foil 1, the inner surface of the top foil 1 faces up, and place it on the workbench, and adjust the position of the laser 5. As shown in Figure 7 , the center of the gas supply tube 4 is aligned with the center of the gas supply hole on the top foil 1, and the gas supply tube 4 and the top foil are clamped by a fixer, the inner surface of the top foil 1 faces up, and is placed below the position of the laser emitter.

[0067] Step 102: use the laser emitter to emit laser light along the edge of the gas supply hole to weld the gas supply tube 4 and the top foil 1. As shown in Figure 7 , the welding point position of the laser emitter is around the gas supply hole of the top foil 1, and the welding should be as close as possible, and the gas supply tube 4 and the outer surface of the top foil 1 should be tightly attached during the welding process, and the gas supply tube 4 and the gas supply hole on the top foil 1 should be aligned. Avoid welding the same position for a long time during welding to cause welding through.

[0068] Step 103: adjust the angle of the top foil 1 after preliminary welding, wind the welding wire 6 around the contact position between the gas supply tube 4 and the top foil 1, and melt the welding wire 6 by the laser emitter to perform secondary welding. As shown in Figure 8 , adjust the angle of the top foil 1 and the gas supply tube 4 after preliminary welding, wind the welding wire 6 around the contact position between the top foil 1 and the gas supply tube 4, the top foil 1 and the gas supply tube 4 form a certain angle with the laser emitter, the laser emitter irradiates the welding wire 6, and melts the welding wire 6 to perform welding.

[0069] Step 104: check the welding part, polish and polish. After the laser emitter melts the welding wire 6 to complete the welding, check whether the welding position is virtual welding, false welding, and add welding wire 6 to the light leakage position for repair welding. Then polish and polish to make the welding position of the top foil 1 and the gas supply pipe 4 not affect the movement of the installed corrugated foil 2 and sleeve 3.

[0070] In a further embodiment of the application, a welding method of a dynamic-static pressure hybrid radial gas foil bearing gas supply pipe 4 and a circular arc top foil 1, comprising: fitting the gas supply pipe 4 nozzle with the top foil 1, making the center of the gas supply pipe 4 nozzle coincide with the center of the gas supply hole on the circular arc top foil 1, fixing the gas supply pipe 4 and the top foil 1 with a clamp, placing the fixed top foil 1 and the gas supply pipe 4 on the workbench, keeping the inner surface of the circular arc top foil 1 upward, moving the laser emitter above the top foil 1, and making the laser irradiate at the gas supply hole circumference for tight laser welding. Then adjust the angle of the clamped top foil 1 so that the laser irradiates at the position where the outer diameter of the top foil 1 contacts the nozzle of the gas supply pipe 4, wrap the welding wire 6 at the contact position between the outer diameter of the top foil 1 and the outer diameter of the gas supply pipe 4, use the laser to melt the welding wire 6, use the welding wire 6 to reinforce the connection between the outer surface of the top foil 1 and the outer diameter of the nozzle of the gas supply pipe 4, and strengthen the welding strength at the contact position between the gas supply pipe 4 and the top foil 1 to reduce gas leakage at the welding position.

[0071] In a further embodiment of the application, the laser welding method provided by the application has the following beneficial effects: the welding method of the dynamic-static pressure hybrid radial gas foil bearing gas supply pipe 4 and the circular arc top foil 1 provided by the application first tightens the circular arc top foil 1 and the gas supply pipe 4, and then welds on the inner surface of the top foil 1, which solves the problem of forming a weld protrusion on the inner surface of the top foil 1 after external direct welding, reduces the problem of top foil 1 inner surface coating falling off caused by processing quality, and reduces the problem of bearing and rotor wear caused by protrusions; then the welding wire 6 is melted by laser at the contact position between the outer surface of the top foil 1 and the outer diameter of the nozzle of the gas supply pipe 4 for welding, which strengthens the connection strength between the top foil 1 and the gas supply pipe 4, ensures the sealing quality of the welding position, and solves the problem of gas leakage at the welding position.

[0072] In further embodiments of the present application, a new laser welding method for a gas supply pipe of a dynamic and static pressure mixed radial gas foil bearing and a circular arc top foil is disclosed. The method comprises: aligning and closely fitting the gas supply steel pipe and the dynamic and static pressure mixed radial gas foil bearing at the gas supply hole on the circular arc top foil 1, so that the center of the circular pipe opening of the gas supply pipe 4 coincides with the center of the gas supply hole on the top foil 1; using laser to first weld on the inner surface of the circular arc top foil 1, and the welding position is at the contact position of the top foil 1 and the pipe opening of the gas supply pipe 4; then secondly welding on the outer surface of the top foil 1, and the welding position is at the contact position of the outer diameter of the pipe opening of the gas supply pipe 4 and the outer surface of the top foil 1, and the contact position is wound with a welding wire, and the welding wire is melted by laser to perform welding, so as to improve the welding strength and sealing performance, ensure that the gas supply pipe 4 and the top foil 1 are firmly welded, there is no gap leakage, solve the protruding welding spot on the inner surface of the top foil 1 after previous welding, improve the processing quality, and reduce the wear of the bearing and the rotor.

[0073] The above merely describes the preferred embodiments of the present application, and is not intended to limit the implementation manners and protection scope of the present application. It should be recognized by those skilled in the art that any equivalent replacement and obvious change made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. A method for welding a gas supply pipe to an arc-shaped top foil of a radial gas foil bearing with dynamic and static pressure mixing, characterized in that, The application relates to a method for manufacturing a top foil (1) and a gas supply pipe (4) of a laser cutting machine. S1: placing the gas supply pipe (4) below the laser (5) and clamping the gas supply pipe (4); S2: placing the top foil (1) between the gas supply pipe (4) and the laser (5), the inner surface of the top foil (1) facing the laser (5), and the outer surface of the top foil (1) abutting the end of the gas supply pipe (4); S3: adjusting the gas supply hole of the top foil (1), the gas supply pipe (4) and the laser (5) to be on the same central axis, and clamping the top foil (1); S4: performing first welding on the inner surface of the top foil (1) at the contact position of the top foil (1) and the gas supply pipe (4) by the laser (5); S5: winding the welding wire (6) at the contact position of the outer surface of the top foil (1) and the gas supply pipe (4); S6: melting the welding wire (6) by the laser (5) and performing second welding on the top foil (1) and the gas supply pipe (4) by the welding wire (6); S7: checking the welding strength of the contact position of the top foil (1) and the gas supply pipe (4), if there is a virtual welding point at the contact position of the top foil (1) and the gas supply pipe (4), adding the welding wire (6) at the virtual welding point and repeating the step S6, if there is no virtual welding point at the contact position of the top foil (1) and the gas supply pipe (4), then the next step is performed; S8: polishing and polishing the contact position of the top foil (1) and the gas supply pipe (4); The gas supply pipe (4) in the step S1 is vertically arranged; The top foil (1) in the step S2 is provided with at least one gas supply hole; In the step S4, the distance between the welding point position of the inner surface of the top foil (1) and the central axis of the gas supply hole is not more than the outer diameter radius of the gas supply pipe (4); The top foil (1) is arranged in the sleeve (3), the sleeve (3) is provided with a plurality of first installation sliding grooves matched with the gas supply pipe (4), and the top foil (1) and the sleeve (3) are provided with the corrugated foil (2), and the corrugated foil (2) is provided with a plurality of second installation sliding grooves matched with the gas supply pipe (4).

2. The method of claim 1, wherein the method further comprises: The diameter of the gas supply hole is smaller than the diameter of the gas supply pipe (4).

3. The method of claim 1, wherein the method further comprises: The diameter of the gas supply hole is equal to the diameter of the gas supply pipe (4).

4. The method of claim 1, wherein the method further comprises: The gas supply pipe (4) in the step S1 is a gas supply steel pipe.

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