Machining method for sealing blade disc

Abstract

The invention relates to a machining method of a sealing blade disc. The machining method comprises the following steps that a blank piece is precisely cast, and rough machining is conducted, wherein the blank piece of the sealing blade disc is formed through a casting technology; performing rough machining on the blank; stress relief heat treatment is carried out after rough machining; grinding the inner cavity of the blade; s200, semi-finish machining and honeycomb welding machining of the blank piece, wherein a mounting inner hole of the honeycomb ring is formed in the blank piece in a finish machining mode; the honeycombs are installed in the installation inner holes, and the honeycombs and the blank piece are welded into a whole through the vacuum brazing technology; finely machining inner side holes of the honeycomb ring by adopting an electric spark grinding process; s300, base body finish machining is conducted on the blank piece, specifically, finish machining is conducted on the outer circle face and the right side end face of the flange ring, the outer side face of the runner ring, the outer circle face of the sealing ring and the supporting ring through a pressure changing method; s400, the blank piece is subjected to thermal spraying and finish machining, specifically, an inner hole of the honeycomb serves as a positioning part, and the outer side circular face of the sealing ring is subjected to finish machining through numerical turning; and then spraying to obtain the coating.

Description

Technical Field

[0001] The invention relates to the technical field of manufacturing process of typical parts of aircraft engines, and in particular to a method for processing a sealing blade disk. Background Art

[0002] A typical type of sealing blade disk part is used in aircraft engines. Figure 1 and Figure 2 As shown, it includes structures such as flange ring, hollow blades, flow channel ring, sealing ring, support ring, mounting hole and honeycomb ring. The outer part of the part is mainly composed of flange ring, arc-shaped flow channel ring and sealing ring, wherein the right side of the flange ring is fixedly connected with the left side of the flow channel ring, and the outer wall surfaces of the two are tangent; a step plane is also designed on the right side of the flange ring, the flow channel ring and the sealing ring are coaxially fixedly connected, and there is a sealing coating on the outer circular surface of the sealing ring. The inner part of the part is mainly composed of mounting ring and supporting ring, the right side of the mounting ring is fixedly connected with the left side of the supporting ring, and a positioning step is designed between the two, and a honeycomb ring is fixedly installed in the mounting ring. Several groups of blades are fixedly connected between the outer and inner parts of the part, and a hollow cavity flow channel structure is opened in the middle of the blades. The blades are inclined at a certain flow channel angle and are evenly distributed around the circumference.

[0003] Due to the complex structure of this type of sealing blade disk parts, the existing processing methods have the following problems: 1) The sealing blade disk is a thin-walled part, which is easily deformed due to repeated clamping and has a low processing size qualification rate; 2) Since the thickness of the honeycomb sheet in the honeycomb ring is only 0.05mm, when processing the honeycomb, the large cutting force can easily cause the honeycomb to collapse and deform, resulting in size differences. The instability of the ordinary brazing process can cause honeycomb blockage and unfused holes, making rework difficult and having a low qualification rate; 3) The outer circle of the sealing ring is sprayed with a sealing coating, which inevitably makes the outer circle of the sealing ring have two materials, the coating and the substrate. However, the hardness of the sealing coating is much greater than that of the substrate material. When grinding the sealing ring, the size difference between the substrate and the coating is large. This size difference causes the precision size of the sealing ring to exceed the tolerance. At the same time, the unreasonable grinding process causes grinding burns, cracks and other problems. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a processing method for a sealing blade disk, which can solve the problems of thin-wall clamping processing deformation, honeycomb collapse, brazing unfusion, and honeycomb blockage in the processing process.

[0005] To achieve the above object, the present invention provides a method for processing a sealing blade disk, comprising the following steps:

[0006] S100, precision casting blank and rough machining: the blank of the sealing blade disc is formed by casting process, and the blank includes the flange ring, flow channel ring, sealing ring, support ring, mounting ring and blade part of the sealing blade disc; the blank is rough machined, and the machining content includes the positioning reference for subsequent processing and clamping positioning; stress relief heat treatment is performed after rough machining; the inner cavity of the blade is ground;

[0007] S200, semi-finishing of the blank and honeycomb welding: in step S100, the installation inner hole of the honeycomb ring is finely machined on the blank; the processed honeycomb is then installed into the installation inner hole, and the honeycomb and the blank are welded into one body by vacuum brazing process; and the inner hole of the honeycomb ring is finely machined by electric spark grinding process;

[0008] S300, base finishing of the blank: base finishing of the blank obtained in step S200 is performed, and the inner hole of the honeycomb ring is used as a positioning, and the outer cylindrical surface and the right end surface of the flange ring, the outer side surface of the flow channel ring, the outer cylindrical surface of the sealing ring, and the support ring are finished by a lathe process and a pressure change method;

[0009] S400, thermal spraying and finishing of the blank: thermal spraying and finishing of the blank obtained in step S300, using the inner hole of the honeycomb as a positioning, finishing the outer circular surface of the sealing ring by lathe before spraying the coating; then spraying the position on the outer circular surface of the sealing ring that needs to be sprayed to obtain the coating.

[0010] Furthermore, in step S100, when casting the blank of the sealing blade disk, a machining allowance is reserved at the parts including the flange ring and the sealing ring, and a solid solution + hot isostatic pressing heat treatment is performed; then, the surface and interior of the blank are checked to ensure that there are no defects, including pores and cracks; the blade thickness is checked to ensure that the thickness of all blades is uniform.

[0011] Furthermore, in the step S100, rough machining of the blank comprises: performing a first rough machining on the blank, using a CNC lathe process to remove the material excess of the inner hole of the flange ring and the inner hole of the mounting ring, ensuring that the single-side allowance of the flange ring and the mounting ring is controlled within 0.6 mm to 0.8 mm, and providing positioning and support surfaces for the second rough machining; performing a second rough machining on the blank, using a CNC lathe process, positioning and fixing the outer circular surface of the flange ring and clamping it in a manner of supporting the left large end surface, removing the material excess on the right side and outer circular surface of the sealing ring, and the material excess on the outer side surface of the runner ring, ensuring that the single-side allowance of these parts is controlled within 0.6 mm to 0.8 mm.

[0012] Furthermore, in the step S100, the inner cavity of the blade is ground using an abrasive flow process to improve the smoothness of the flow channel surface.

[0013] Furthermore, in the step S200, the welding after the honeycomb is installed includes: after the honeycomb is installed in the inner hole of the installation ring, the BNi82CrSiBFe solder is prepared into a paste, filled into the gap between the honeycomb ring and the substrate, and after a spot welding positioning process combination, the whole is placed in front of a vacuum furnace for a final inspection of the gap and the gap is filled with paste solder, and a brazing flow inhibitor is brushed at a position 1mm to 40mm away from the solder, and after drying, it is placed in a vacuum furnace for insulation; then, the weld of the blank after welding is subjected to a Freon inspection to ensure that the welding rate is greater than the required value.

[0014] Furthermore, in the step S200, the electric spark grinding process is used to fine-process the inner hole of the honeycomb ring, including: using the left and right end faces of the blank as support, grinding the electrode before processing to ensure that the electrode runout is within the required value range, and the part runout is within the required value range, and then roughing and fine-machining are performed, the roughing allowance is controlled within 0.2mm~0.3mm, and fine-machining is performed to the final design size.

[0015] Furthermore, the step S300 includes: using the large end face of the blank as a support and fixing it by a pressure-dividing method, first using a pressure plate to press the right end face of the support ring, and aligning the outer circle runout of the sealing ring to be within the required value range, and through a CNC lathe process, the outer circular surface and right end face of the flange ring, the outer side surface of the flow channel ring, and the outer circular surface of the sealing ring are fine-machined, and the outer circular surface of the sealing ring is machined into a concave structure to increase the contact area between the coating and the substrate; then using a pressure plate to press the right end face of the flange ring, and at the same time unloading the pressure plate on the right end face of the support ring to ensure that the blank is not loose, and fine-machine the inner side surface and right end face of the support ring.

[0016] Furthermore, in step S400, the method of spraying on the outer circular surface of the sealing ring includes: protecting all non-sprayed surfaces before spraying, and allowing residual coating in the transition zone; spraying the concave structure on the outer circular surface of the sealing ring, the outer circle size of the concave structure before spraying is Φ192.7mm, and after spraying is Φ193mm, to ensure that there are no cracks and coating peeling after spraying.

[0017] Furthermore, the step S400 also includes: grinding the sprayed blank, using a single crystal corundum grinding wheel on a CNC grinding machine to grind the outer circular surface of the sealing ring, the grinding wheel diameter is 200 mm, the grinding wheel grit is 46#, the grinding wheel hardness is K grade, and the roughing and finishing methods are divided into roughing and finishing methods. The roughing depth is 0.008 mm each time, and a margin of 0.01 mm to 0.02 mm is left after rough grinding for fine grinding. During fine grinding, the grinding wheel feed speed V=8 mm / min, the grinding wheel speed n=2500 r / min, and the finishing depth ap=0.003 mm each time

[0018] As described above, the method for processing the sealing blade disk according to the present invention has the following beneficial effects:

[0019] It can obtain a sealed blade disk well, and there is no need for repeated clamping during the processing, which avoids deformation due to frequent repeated clamping and improves the qualified rate of processing dimensions. When processing honeycombs, it can reduce the problems of honeycomb collapse, deformation and size difference caused by large cutting force, avoid honeycomb blockage and unfused problems caused by unstable ordinary brazing process, reduce the difficulty of rework and increase the qualified rate. When grinding the outer circle of the sealing ring, it can reduce the problem of precision size out-of-tolerance of the sealing ring caused by the large difference in size between the substrate and the coating, and at the same time reduce the problems of grinding burns and cracks caused by unreasonable grinding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the sealing blade disk in the present invention.

[0021] Figure 2 for Figure 1 AA section view in.

[0022] Figure 3 for Figure 2 The P view in .

[0023] Figure 4 It is a schematic diagram of the structure of the grinding fixture in the present invention.

[0024] Figure 5 It is a schematic diagram of the working of the grinding fixture of the present invention for clamping a blank.

[0025] Figure 6 It is a schematic diagram of the dimensions of the coating and the sealing ring substrate after grinding in the present invention.

[0026] Figure 7 It is a schematic diagram of the process of the sealing blade disk processing method of the present invention.

[0027] Description of Figure Numbers

[0028] 1 Sealing leaf disc

[0029] 11 Flange ring

[0030] 12 Runner ring

[0031] 13 Sealing ring

[0032] 14 Coating

[0033] 15 Mounting ring

[0034] 16 Support ring

[0035] 17 Blade

[0036] 18 Honeycomb Ring

[0037] 2 Grinding fixture

[0038] 21 Clamp body

[0039] 211 Left support

[0040] 212 Mounting body

[0041] 213 Connecting rod

[0042] 22 Clamping plate

[0043] 23 Lock nut DETAILED DESCRIPTION

[0044] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] like Figures 1 to 7As shown, the present invention provides a method for processing a sealing blade disk 1, wherein the sealing blade disk 1 includes structures such as a flange ring 11, a flow channel ring 12, a sealing ring 13, a mounting ring 15, a support ring 16, blades 17 and a honeycomb ring 18; the outer part of the sealing blade disk 1 includes a flange ring 11, an arcuate flow channel ring 12, and a sealing ring 13, the right side of the flange ring 11 is fixedly connected to the left side of the flow channel ring 12, the flow channel ring 12 and the sealing ring 13 are coaxially fixedly connected, and a coating 14 for sealing is provided on the outer circular surface of the sealing ring 13. The inner part of the sealing blade disk 1 includes a mounting ring 15 and a support ring 16, the right side of the mounting ring 15 is fixedly connected to the left side of the support ring 16, a honeycomb ring 18 is fixedly installed in the inner hole of the mounting ring 15, and a plurality of groups of blades 17 are fixedly connected between the outer part and the inner part of the sealing blade disk 1.

[0049] The processing method of the present invention comprises the following steps:

[0050] S100, precision casting blanks and rough machining:

[0051] A casting process is used to form a blank of the sealing blade disk 1, wherein the blank includes the main body of the sealing blade disk 1, including the flange ring 11, the flow channel ring 12, the sealing ring 13, the mounting ring 15, the support ring 16 and the blade 17, but does not include the honeycomb ring 18 and the layer 14; the blank is rough-machined, and the machining content includes the positioning reference for subsequent machining and clamping positioning; after the rough machining, a stress relief heat treatment is performed; and the inner cavity of the blade 17 is ground. Preferably, in this embodiment, it specifically includes:

[0052] Step S101: Use a casting method to manufacture a blank of the cast sealing blade disk 1, and reserve a 1mm to 1.2mm machining allowance on the mounting surfaces of the flange ring 11 and the sealing ring 13, wherein the mounting surfaces of the flange ring 11 and the sealing ring 13 include the inner hole surface and both side end surfaces of the flange ring 11, and the inner hole surface and end surface of the mounting ring 15; perform solid solution + hot isostatic pressing heat treatment; perform inspection by means of X-ray and fluorescent inspection to ensure that there are no defects such as pores and cracks on the surface and inside of the blank; use industrial CT to non-destructively inspect the thickness of the blades 17 to ensure the uniformity of the thickness of all blades 17.

[0053] Step S102: The blank processed in step S101 is marked with a drawing number and a serial number in a conspicuous place on the non-installation surface by a benchwork mark, which is conducive to the marking distinction and traceability control of subsequent processing and assembly of batch parts.

[0054] Step S103: Perform the first rough machining on the blank after step S102, and use a CNC lathe process to remove the material excess of the inner holes of the flange ring 11 and the mounting ring 15 to ensure that the single-side allowance of the flange ring 11 and the mounting ring 15 is controlled within 0.6mm~0.8mm, providing reliable positioning and support surfaces for the second rough machining.

[0055] Step S104: The blank after step S103 is subjected to a second rough machining by using a lathe process. The outer circle of the flange ring 11 is used for positioning and fixing and the left large end face is used for support and clamping. The excess material on the right end face and the outer circular surface of the sealing ring 13 and the excess material on the outer surface of the flow channel ring 12 are removed to ensure that the single-side excess of these parts is controlled within 0.6mm~0.8mm.

[0056] S105: Use bench work to remove sharp edge burrs produced during machining of the blank.

[0057] S106: performing stress relief heat treatment on the blank after step S105 to eliminate processing residual stress and reduce subsequent processing deformation.

[0058] S107: grinding the hollow inner cavity of the blade 17 of the blank after step S106 by using an abrasive flow process to improve the smoothness of the flow channel surface, preferably reaching a roughness of ≤Ra0.4μm.

[0059] S200, semi-finishing of blanks and honeycomb welding:

[0060] In step S100, the inner hole of the honeycomb ring 18 is finely machined on the blank, that is, the inner hole of the mounting ring 15; the processed honeycomb ring 18 is then installed in the inner hole, and the honeycomb ring 18 and the blank are welded into one body by vacuum brazing process; and then the inner hole of the honeycomb ring 18 is finely machined by electric spark grinding process. Preferably, in this embodiment, the following steps are specifically included:

[0061] S201: For the blank processed in step S100, use the CNC lathe process to support the inner hole of the mounting ring 15 with soft claws. Before processing, ensure that the alignment runout is less than the required value, preferably ≤0.05mm. Semi-finish the outer circle of the sealing ring 13 with the margin controlled at 0.2mm~0.4mm, and perform burr-free cutting by optimizing the CNC program.

[0062] S202: For the blank processed in step S201, use the CNC lathe process to clamp the outer circular surface of the sealing ring 13 with soft claws. Before processing, align the soft claw runout to be less than the required value, preferably ≤0.01mm, and fine-process the inner hole of the mounting ring 15 to ensure that the cylindricity meets the requirements, preferably ≤0.02mm, and the tolerance is controlled within the required range, preferably ±0.01mm, and the burr-free cutting is performed by optimizing the CNC program.

[0063] Step S203: For the blank processed in step S202, install the honeycomb ring 18 in the inner hole of the mounting ring 15, modulate the brazing material BNi82CrSiBFe into a paste, fill it into the gap between the honeycomb ring 18 and the substrate (i.e., the mounting ring 15), and after combining the spot welding positioning process, place the whole in front of the vacuum furnace for final inspection of the gap and fill it with paste brazing material, and brush Nicrobraz brazing flow blocker at a distance of 1mm to 40mm from the brazing material, dry it, and place it in a vacuum furnace, optimize the temperature to 1045℃, and keep it warm for 12 minutes. Finally, perform a Freon test on the weld of the blank after welding to ensure that the welding rate is ≥95%, which is conducive to solving the problems of weld failure and honeycomb pore blocking.

[0064] Step S204: using bench work or other methods to remove sharp edge burrs produced by part processing and remove excess solder on non-weld surfaces without damaging the substrate.

[0065] Step S205: For the blank processed in step S204, the end faces on both sides of the blank, i.e. the left end face of the flange ring 11 and the right end face of the sealing ring 13, are finely processed by turntable grinding. During processing, the preferred grinding wheel speed is 1440r / min and the turntable speed is 240r / min. Before grinding, the diamond pen is used to fine-tune the grinding wheel for each blank processed to ensure that the grinding wheel is sharp. Before processing, the support surface runout is ≤0.01mm. The small end face (the right end face of the sealing ring 13) is first supported to grind the large end face (the left end face of the flange ring 11), and then the small end face is supported to grind the large end face, and reciprocate 3 times to ensure that the material excess is evenly removed from the two end faces, and the parallelism of the two end faces is ensured to be ≤0.03mm and the coloring area is ≥80%.

[0066] Step S206: For the blank processed in step S205, in order to avoid the problem of poor quality of honeycomb collapse, deformation and so on caused by conventional cutting of the honeycomb ring 18, the inner hole of the honeycomb ring 18 is finely processed by adopting the electric spark grinding process on a honeycomb grinder, and the left and right end faces of the blank are used as supports. The electrode is ground before processing to ensure that the electrode runout is within the required value range (≤0.005mm) and the part runout is within the required value range (≤0.01mm). Then, rough and fine processing are performed, and the rough processing allowance is controlled at 0.2mm~0.3mm. The final design size is obtained by fine processing.

[0067] S300, base finishing of blank:

[0068] The blank obtained in step S200 is subjected to base finishing, and the inner hole of the honeycomb ring 18 is used as a positioning, and the outer cylindrical surface and the right end surface of the flange ring 11, the outer side surface of the flow channel ring 12, the outer cylindrical surface of the sealing ring 13 (before spraying at this time), and the support ring 16 are finished by a number of lathe processes and a pressure change method. Preferably, in this embodiment, it specifically includes:

[0069] Step S301: The inner hole of the honeycomb ring 18 is used as a positioning for the blank processed in step S200, and the large end face of the blank (the left end face of the flange ring 11) is used as a support, and the pressure change method is adopted: first, a pressure plate is used to press the right end face of the support ring 16, and the outer circle runout of the sealing ring 13 is aligned within the required value range (≤0.03mm). Through the lathe process, the outer circular surface and the right end face of the flange ring 11, the outer side surface of the flow channel ring 12, and the outer circular surface of the sealing ring 13 are fine-machined. Before spraying, the outer circular surface of the sealing ring 13 is processed into a concave structure to increase the contact area between the coating 14 and the substrate, which is beneficial to the bonding force and stability of the coating 14 and the substrate and is not easy to fall off; then a pressure plate is used to press the right end face of the flange ring 11, and the pressure plate on the right end face of the support ring 16 is unloaded at the same time to ensure that the blank is not loose on the machine tool, and the inner side surface and the right end face of the support ring 16 are fine-machined. The pressure division method can ensure that the blank can be clamped and processed once without unloading the machine tool, avoiding repeated clamping errors and improving processing efficiency and quality.

[0070] Step S302: Using bench work to remove sharp edge burrs produced by part processing from the blank processed in step S301.

[0071] Step S303: Immerse the blank processed in step S302 in an ultrasonic cleaning tank, start the ultrasonic cleaning machine, and perform ultrasonic cleaning for 20 minutes. After cleaning, check the sealing ring 13 and the flow channel of the blade 17 to ensure that there is no excess material. Use an air gun to clean the surface excess material. Repeat the ultrasonic cleaning until it is qualified. The purpose of cleaning is to eliminate the interference of excess material on fluorescence inspection and improve the efficiency and accuracy of fluorescence analysis.

[0072] Step S304: The outer circular surface of the sealing ring 13 before spraying is inspected by a fluorescent inspection method on the blank processed in step S303 to ensure that there are no defects such as cracks on the base before spraying, so as to avoid crack propagation caused by thermal spraying.

[0073] Step S400: thermal spraying and finishing of the blank:

[0074] The blank obtained in step S300 is subjected to thermal spraying and fine machining, and the inner hole of the honeycomb is used as a positioning. Before spraying the coating 14, the outer circular surface of the sealing ring 13 is finely machined by lathe, and a concave structure is preferably machined at the position where spraying is required; then the position where spraying is required on the outer circular surface of the sealing ring 13 is sprayed to obtain the coating 14; preferably, in this embodiment, step S400 specifically includes:

[0075] S401: The blank obtained in step S300 is subjected to thermal spraying to obtain a coating 14 on the outer circular surface of the sealing ring 13. All non-sprayed surfaces are protected before spraying, and residual coating is allowed in the transition zone; the concave structure on the outer circular surface of the sealing ring 13 (the part that needs to be sprayed) is sprayed with Cr 3 Cr 2 -NiCrAlY coating, the outer circle size of the concave substrate before spraying is Φ192.7mm, and after spraying is Φ193mm. There shall be no defects such as cracks and coating peeling after spraying.

[0076] S402: Grinding the blank obtained in step S401. In order to avoid the problem of large size difference and grinding burn cracks when the coating 14 and the substrate are ground at the same time, a grinding fixture 2 is designed and manufactured to fix and clamp the blank for processing. The structure of the grinding fixture 2 is shown in the attached figure. Figure 4 and Figure 5 As shown, the grinding fixture 2 includes a clamp body 21, a clamping plate 22 and a locking nut 23. The clamp body 21 includes a coaxially designed left support 211, a mounting body 212 and a connecting rod 213, which are fixedly connected as one body. The left support 211 and the connecting rod 213 are respectively located on the left and right sides of the mounting body 212. A top hole is provided at the left end of the left support 211 for positioning with the top support of the grinder, and a groove is provided on the outer circle of the left support 211 for connecting with the clamp of the grinder. A step circle is provided on the left outer circle of the mounting body 212 for axial support and circumferential positioning with the blank, and 6 holes are provided inside the mounting body 212, which not only ensures the support strength but also has the effect of reducing weight, which is beneficial to improving the processing accuracy. The connecting rod 213 is coaxially fixedly connected to the mounting body 212, and a threaded structure is designed on the outer circle of the connecting rod 213 for connecting the clamping nut, and a top hole is designed on the right end of the connecting rod 213 for top support positioning. The outer diameter of the clamping plate 22 is designed according to the positioning inner hole clearance of 0.05mm on the right side of the blank, specifically, the inner hole clearance of 0.05mm with the support ring 16, and the inner hole of the clamping plate 22 and the outer diameter clearance of the connecting rod 213 are designed to be 0.05mm. The outer diameter of the clamping plate 22 is designed as a step structure, which is used to use a micrometer to align the reference inner hole (the inner hole of the support ring 16) before processing, and the alignment runout is ≤0.005mm to ensure that the size and shape tolerances are qualified. The locking nut 23 is threadedly connected to the connecting rod 213, and after aligning the blank, it is tightly pressed against the right side of the clamping plate 22, thereby fixing the blank to form a component as a whole, ensuring that the blank will not loosen during the processing process.

[0077] The blank is processed on a CNC grinder using a single crystal corundum grinding wheel (SA). The grinding wheel is used to grind the high-hardness coating 14 + substrate synchronously. The grinding wheel diameter is 200mm, the grinding wheel grit is 46#, and the grinding wheel hardness is K grade. The roughing and finishing methods are divided into roughing and finishing methods. The roughing depth is 0.008mm each time. After roughing, a margin of 0.01mm~0.02mm is left for fine grinding. Because fine grinding affects the final dimensional accuracy, the fine grinding parameters are optimized: grinding wheel feed speed V=8mm / min, grinding wheel speed n=2500r / min, and fine grinding depth ap=0.003mm each time. Before fine grinding, the grinding wheel is trimmed with a diamond pen to ensure that the grinding wheel is sharp. It ensures that the size of the substrate and coating 14 are controlled within Φ1930mm, the runout is controlled within 0.01mm, the spraying thickness is 0.1mm~0.25mm, and there is no crack or burn on the grinding surface, which is conducive to improving the sealing performance of the sealing ring. Through the above grinding process, the difference between the coating 14 and the substrate size Δ = D1-D2 is reduced, see the attached Figure 6 shown.

[0078] Step S403: The blank processed in step S402 is subjected to bench work to remove burrs and excess materials, especially to ensure that there are no bumps or excess materials on the coating 14 and the blade 17, so as to obtain the final finished parts.

[0079] Step S404: Perform final inspection and storage on the finished parts obtained in step S403, clean the parts with organic solvent to ensure that there are no pollutants, and then individually package them with paraffin paper and a layer of neutral paper. When loading them into packaging boxes in batches, pay attention to filling the gaps between the parts with buffers to avoid damage.

[0080] The processing method of the sealing blade disk of the present invention has the following beneficial effects:

[0081] The sealing blade disk 1 can be obtained well, and there is no need for repeated clamping during the processing, which avoids deformation due to frequent repeated clamping and improves the qualified rate of processing dimensions. When processing honeycombs, it can reduce the problems of honeycomb collapse, deformation and size difference caused by large cutting force, avoid honeycomb blockage and unfused problems caused by unstable ordinary brazing process, reduce the difficulty of rework and increase the qualified rate. When grinding the outer circle of the sealing ring 13, it can reduce the problem of precise size out-of-tolerance of the sealing ring caused by the large difference in size between the substrate and the coating 14, and at the same time reduce the problems of grinding burns and cracks caused by unreasonable grinding process.

[0082] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for processing a sealing blade disk, characterized in that: The following steps are involved: S100, precision casting blank and rough machining: the blank of the sealing blade disc is formed by casting process, and the blank includes the flange ring, flow channel ring, sealing ring, support ring, mounting ring and blade part of the sealing blade disc; the blank is rough machined, and the machining content includes the positioning reference for subsequent processing and clamping positioning; stress relief heat treatment is performed after rough machining; the inner cavity of the blade is ground; S200, semi-finishing of the blank and honeycomb welding: in step S100, the installation inner hole of the honeycomb ring is finely machined on the blank; the processed honeycomb is then installed into the installation inner hole, and the honeycomb and the blank are welded into one body by vacuum brazing process; and the inner hole of the honeycomb ring is finely machined by electric spark grinding process; S300, base finishing of the blank: base finishing of the blank obtained in step S200 is performed, and the inner hole of the honeycomb ring is used as a positioning, and the outer cylindrical surface and the right end surface of the flange ring, the outer side surface of the flow channel ring, the outer cylindrical surface of the sealing ring, and the support ring are finished by a lathe process and a pressure change method; S400, thermal spraying and finishing of the blank: thermal spraying and finishing of the blank obtained in step S300, using the inner hole of the honeycomb as a positioning, finishing the outer circular surface of the sealing ring by lathe before spraying the coating; then spraying the position on the outer circular surface of the sealing ring that needs to be sprayed to obtain the coating.

2. The method for processing a sealing blade disk according to claim 1, characterized in that: In the step S100, when casting the blank of the sealing blade disk, a machining allowance is reserved at the parts including the flange ring and the sealing ring, and a solid solution + hot isostatic pressing heat treatment is performed; then, the surface and interior of the blank are checked to ensure that there are no defects, including pores and cracks; the blade thickness is checked to ensure that the thickness of all blades is uniform.

3. The method for processing a sealing blade disk according to claim 1 or 2, characterized in that: In the step S100, rough machining of the blank comprises: performing a first rough machining on the blank, using a CNC lathe process to remove the material excess of the inner hole of the flange ring and the inner hole of the mounting ring, ensuring that the single-side allowance of the flange ring and the mounting ring is controlled within 0.6 mm to 0.8 mm, and providing positioning and supporting surfaces for the second rough machining; performing a second rough machining on the blank, using a CNC lathe process, positioning and fixing the outer circular surface of the flange ring and clamping it in a manner of supporting the left large end surface, removing the material excess on the right side and outer circular surface of the sealing ring, and the material excess on the outer side surface of the flow channel ring, ensuring that the single-side allowance of these parts is controlled within 0.6 mm to 0.8 mm.

4. The method for processing a sealing blade disk according to claim 3, characterized in that: In the step S100, the inner cavity of the blade is ground by an abrasive flow process to improve the smoothness of the flow channel surface.

5. The method for processing a sealing blade disk according to claim 1, characterized in that: In the step S200, the method for finely machining the inner hole of the honeycomb installation on the blank comprises: using a CNC lathe process to support the inner hole of the installation ring with soft jaws, ensuring that the alignment runout is less than the required value before machining, and semi-finishing the outer circular surface of the sealing ring with the allowance controlled within 0.2mm to 0.4mm; using a CNC lathe process to clamp the outer circular surface of the sealing ring with soft jaws, ensuring that the alignment runout of the soft jaws meets the required value before machining, and fine-machining the inner hole of the ring installation ring to ensure that the cylindricity meets the requirements and the tolerance is controlled within the required range.

6. The method for processing a sealing blade disk according to claim 1, characterized in that: In the step S200, the welding after the honeycomb is installed includes: after the honeycomb is installed in the inner hole of the installation ring, the BNi82CrSiBFe solder is prepared into a paste, filled into the gap between the honeycomb ring and the substrate, and after a spot welding positioning process combination, the whole is placed in front of a vacuum furnace for a final inspection of the gap and the gap is filled with paste solder, and a brazing flow inhibitor is brushed at a position 1mm to 40mm away from the solder, and after drying, it is placed in a vacuum furnace for insulation; then, the weld of the blank after welding is subjected to a Freon inspection to ensure that the welding rate is greater than the required value.

7. The method for processing a sealing blade disk according to claim 1 or 7, characterized in that: In the step S200, the inner hole of the honeycomb ring is finely processed by the electric spark grinding process, including: using the left and right end faces of the blank as support, grinding the electrode before processing to ensure that the electrode runout is within the required value range, and the part runout is within the required value range, and then roughing and fine processing are performed, the roughing allowance is controlled at 0.2mm to 0.3mm, and fine processing is performed to the final design size.

8. The method for processing a sealing blade disk according to claim 7, characterized in that: The step S300 includes: using the large end face of the blank as a support and fixing it by a pressure-dividing method, first using a pressure plate to press the right end face of the support ring, and aligning the outer circle runout of the sealing ring to be within the required value range, and through a lathe process, fine-machining the outer circular surface and right end face of the flange ring, the outer side surface of the flow channel ring, and the outer circular surface of the sealing ring, and processing the outer circular surface of the sealing ring into a concave structure to increase the contact area between the coating and the substrate; then using a pressure plate to press the right end face of the flange ring, and at the same time unloading the pressure plate on the right end face of the support ring to ensure that the blank is not loose, and fine-machining the inner side surface and right end face of the support ring.

9. The method for processing a sealing blade disk according to claim 8, characterized in that: In the step S400, the method for spraying on the outer circular surface of the sealing ring includes: protecting all non-sprayed surfaces before spraying, and allowing residual coating in the transition zone; spraying the concave structure on the outer circular surface of the sealing ring, the outer circle size of the concave structure before spraying is Φ192.7mm, and after spraying is Φ193mm, to ensure that there are no cracks and coating peeling after spraying.

10. The method for processing a sealing blade disk according to claim 1 or 9, characterized in that: The step S400 also includes: grinding the sprayed blank, grinding the outer circular surface of the sealing ring using a single crystal corundum grinding wheel on a CNC grinding machine, the grinding wheel diameter is 200mm, the grinding wheel grain size is 46#, the grinding wheel hardness is K grade, and the roughing and finishing methods are divided into roughing and finishing methods, each grinding depth is 0.008mm, and after roughing, a margin of 0.01mm to 0.02mm is left for finishing. During finishing, the grinding wheel feed speed V=8mm / min, the grinding wheel speed n=2500r / min, and the finishing depth ap=0.003mm each time.

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