Axial flow casing combined blade tip machining device and machining method

Abstract

The invention discloses an axial flow casing combined blade tip machining device and method, and belongs to the technical field of aero-engine part machining, the axial flow casing combined blade tip machining device comprises a wax filling mechanism used for filling wax into an axial flow casing so as to wrap and fix a guide blade and a static blade of the axial flow casing and expose the blade tip, and the wax filling mechanism comprises a workbench; an electric heating assembly used for heating and melting wax blocks is arranged in the wax filling box, a mounting opening is formed in the workbench, the storage plate is rotatably arranged in the mounting opening, and the wax filling pipe is used for filling wax into the axial flow casing; a containing groove is formed in the bottom of a bottom plate of the wax filling box and used for containing the wax injection pipe and guiding heat in the wax filling box into the wax injection pipe so as to prevent wax liquid solidification in the wax injection pipe, and the limiting assembly is arranged in the containing groove and used for clamping and limiting the wax injection pipe. The problems that the grinding machining efficiency of the combined blade tip of the axial flow casing is low and a grinding spline curve cannot be machined are solved, the machining efficiency is improved, and the machining requirement of the novel blade tip is met.

Description

Technical Field

[0001] The present application relates to the technical field of aircraft engine parts processing, and in particular, to an axial flow casing combined blade tip processing device. In addition, the present application also relates to a processing method including the axial flow casing combined blade tip processing device. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present application.

[0003] The compressor part of an aircraft engine is mainly composed of a compressor rotor assembly and an axial flow casing assembly. The axial flow casing assembly is equipped with a first-stage guide vane and multiple stages of stator blades. The clearance requirements between the guide vanes and stator blades and the compressor rotor assembly are relatively strict. A larger clearance will affect the airflow compression performance of the compressor; if the clearance is too small, the vibration generated during the operation of the engine will cause the blades to scrape against the high-speed rotating compressor rotor part, causing the blades to be knocked off and the engine to be damaged.

[0004] The distance from the blade tip to the center of the compressor is controlled by the dimensions of multiple parts such as the axial flow casing and blades, with a long dimension chain and large errors. In order to ensure the precise gap between the blade tip and the compressor rotor assembly, the blade tip needs to be ground after the guide vanes and stationary vanes are assembled on the axial flow casing assembly to ensure the consistency and accuracy of the distance from the blade tip to the center of the casing at all levels. The blade tip size requirements after grinding are: the blade tip linear profile is 0.04-0.06mm, and the radial runout is 0.02-0.03mm.

[0005] At present, the blade tip processing method of various types of axial flow casing components is grinding. According to the blade tip point and angle given in the design, the grinding wheel is trimmed to a certain angle or the main shaft is tilted to a certain angle to grind the blade tip to achieve the size and accuracy that meet the design requirements. The grinding processing quality is good and can meet the higher dimensional accuracy of the design. However, there are the following problems:

[0006] 1. Under low efficiency, the amount of cutting in grinding is small, the efficiency is low, and the general axial flow casing assembly is composed of a first-stage guide vane and multiple-stage stationary vanes. The internal space of the casing is limited. Some blades cannot be processed by the angle of the spindle, and can only be processed by grinding wheels. When the angle is large, the grinding amount of the grinding wheel is large, which is time-consuming. In addition, the point and angle requirements of each level of blades are inconsistent, and the grinding wheel needs to be ground multiple times to complete the processing of a casing. At this stage, it takes about two shifts to process an axial flow casing combined blade tip by grinding.

[0007] 2. Grinding wheel can only be used to process blade tip with angled bevel. For blade tip with spline curve (as shown in the attached manual) Figure 2 As shown in the figure, the blade tip is a spline curve), and the blade tip processing cannot be completed by grinding the grinding wheel or swinging the spindle angle.

[0008] The above-mentioned problem of grinding the combined blade tip of the aircraft engine axial flow casing can no longer meet the combined blade tip processing requirements of the existing casing models. Therefore, after long-term research and experiments, we provide a new axial flow casing combined blade tip processing device and processing method, striving to solve the problems of low grinding efficiency of the axial flow casing combined blade tip and the inability to process the grinding spline curve, so as to improve the processing efficiency and meet the new blade tip processing requirements.

[0009] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0010] In view of at least one of the above technical problems, the present application provides an axial flow casing combined blade tip processing device, which aims to solve the problems of low grinding efficiency of axial flow casing combined blade tips and inability to process grinding spline curves, so as to improve processing efficiency and meet the processing needs of new blade tips.

[0011] At the same time, the present application also provides a processing method using the above-mentioned axial flow casing combined blade tip processing device.

[0012] According to one aspect of the present application, an axial flow casing combined blade tip processing device is provided, comprising a wax filling mechanism for filling the axial flow casing with wax to wrap and fix its guide vanes and stationary blades and expose the blade tips, the wax filling mechanism comprising a workbench, a wax filling box, a storage plate, a wax injection pipe and a limit assembly:

[0013] A mounting plate is supported on the workbench, a wax filling box is mounted on the side wall of the mounting plate, an electric heating component for heating and melting the wax block is arranged in the wax filling box, a mounting opening is opened on the workbench, a placement plate is rotatably arranged in the mounting opening, the placement plate is used to support the axial flow casing, a wax filling pipe is connected to a wax outlet pipe of the wax filling box, and the wax filling pipe is used to fill the axial flow casing with wax;

[0014] A storage groove is provided at the bottom of the base plate of the wax filling box, which is used to store the wax injection tube and introduce the heat in the wax filling box into the wax injection tube to prevent the wax liquid from solidifying inside the wax injection tube. A limit assembly is arranged in the storage groove, and the limit assembly is used to clamp and limit the wax injection tube.

[0015] In some embodiments of the present application, the receiving groove is a spiral disc structure, and a heat conducting sheet is provided on the side wall of the receiving groove.

[0016] In some embodiments of the present application, the limiting assembly is provided with multiple groups and is arranged at intervals in the receiving groove. The limiting assembly includes limiting members arranged in pairs. The limiting members are arc-shaped plate structures. The limiting members arranged in pairs are used to clamp and limit the wax injection tube.

[0017] In some embodiments of the present application, the storage plate is arranged in the installation opening through a rotating shaft on both sides along the width direction of the storage plate, and sliding supports are slidably arranged on both sides along the length direction of the storage plate. The sliding supports are used to extend out of the outside of the storage plate and abut against the workbench when the storage plate is in a horizontal state to support the storage plate and limit the flipping of the storage plate.

[0018] In some embodiments of the present application, limiting cavities are provided on both sides of the storage plate along its length direction, and the sliding support is slidably arranged in the limiting cavities. The bottom surface of the storage plate is located at the limiting cavities on both sides and locking members are provided. The locking members are used to cooperate with the limiting screw holes preset on the storage plate and pass through the limiting screw holes to tighten the sliding support members to lock the sliding support members to a limited position.

[0019] In some embodiments of the present application, limiting bosses are provided on both sides of the top of the storage plate, and the limiting bosses on both sides are used to limit and clamp the axial flow casing. The limiting bosses on both sides are also used to collect and guide the wax liquid remaining on the top of the storage plate to the middle of the storage plate. A residual wax collection box is provided under the workbench, and the residual wax collection box is used to receive and collect the residual wax liquid flowing down after the storage plate is flipped over.

[0020] According to another aspect of the present application, a method for machining a combined blade tip of an axial flow casing is provided, using the above-mentioned combined blade tip machining device of the axial flow casing, and comprising the following steps:

[0021] S100, wax is poured into the axial flow casing through a wax pouring mechanism, so that the wax wraps and fixes the guide vanes and the stationary vanes, and exposes the blade tip portion to be processed;

[0022] S200, after the wax is completely solidified, the parts are clamped on the CNC lathe;

[0023] S300, cutting and processing the blades of each level of the axial flow casing separately, and the cutting direction during processing is that the blade cuts from the blade basin to the blade back;

[0024] S400. After the blade tip turning is completed, the axial flow casing is placed in a wax melting pool for wax melting to remove the wax layer.

[0025] In some embodiments of the present application, in step S300, when cutting the blades at each stage, the first cutting is performed by backing off the blade to avoid cutting deformation caused by excessive cutting depth due to uneven margin.

[0026] In some embodiments of the present application, the cutting parameters in step S300 are: linear speed 50-55 m / min, feed rate 0.1-0.12 mm / min, cutting depth: 0.05-0.1 mm.

[0027] In some embodiments of the present application, the arc R angle of the cutting blade used in the cutting process in step S300 is not greater than 0.4.

[0028] This application has the following beneficial effects:

[0029] The present application discloses an axial flow casing combined blade tip processing device, which can realize fast and stable wax filling operation on the axial flow casing, wrap and fix the guide vanes and stationary blades with wax liquid and expose the blade tip to be processed, so that the subsequent process can process the blade tip by cutting, and effectively solves the problem that in the blade tip processing process, the blade is a thin-walled part with a small thickness of the blade tip, and the turning force is too large during turning, which can easily cause the blade to deform, bend and become scrapped. At the same time, it can also avoid the blade being in a suspended state during the processing, poor rigidity, easy vibration and tool vibration during turning, and difficulty in ensuring the required blade tip runout value.

[0030] The processing method of the combined blade tip of the axial flow casing of the present application also has the above-mentioned beneficial effects. It also includes a solution of turning the blade tip based on the problems existing in the previous grinding processing of the combined blade tip of the axial flow casing. The turning processing has no requirements on the composition shape of the blade tip points, and can be an oblique line, a broken line or a spline curve. The blade tip contour and runout size after processing by the processing method of the present application can meet the design requirements and meet the processing needs. The processing time is shortened to 1.5 shifts, and adaptive processing can be performed for different blade tip shapes (the blade tip point is an oblique line, a broken line or a spline curve). The switching is very convenient, which improves the processing efficiency while ensuring the processing quality of the parts, and can meet the processing requirements of different blade tip shapes.

[0031] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above at the same time. In addition to the purposes, features and advantages described above, this application also has other purposes, features and advantages. The following will further describe this application in detail with reference to the figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 It is a schematic diagram of the wax filling area of ​​the axial flow casing of the preferred embodiment of the present application;

[0034] Figure 2 is a schematic diagram of a leaf with a spline curve at the tip;

[0035] Figure 3 is a schematic diagram of the cutting direction during blade tip machining in a preferred embodiment of the present application;

[0036] Figure 4 It is a structural schematic diagram of the wax filling mechanism of the preferred embodiment of the present application;

[0037] Figure 5 It is a schematic diagram of the installation of the storage plate of the preferred embodiment of the present application;

[0038] Figure 6 This is a schematic diagram of the internal structure of the wax filling box of the preferred embodiment of the present application;

[0039] Figure 7 is a schematic diagram of the installation of a sliding support member of a preferred embodiment of the present application;

[0040] Figure 8 It is a structural schematic diagram of a storage groove of a preferred embodiment of the present application;

[0041] Fig. 9 It is a schematic diagram of the storage of the wax injection tube in the preferred embodiment of the present application;

[0042] Legend: 100, axial flow casing; 101, guide vane; 102, stationary blade; 1, workbench; 11, mounting plate; 12, mounting port; 2, wax filling box; 21, mounting frame; 22, wax outlet pipe; 23, filter screen; 24, storage groove; 3, storage plate; 31, limiting boss; 32, sliding support; 33, rotating shaft; 34, limiting cavity; 4, wax injection tube; 5, transfer tube; 6, limiting assembly; 61, limiting member. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0044] Figure 1 It is a schematic diagram of the wax filling area of ​​the axial flow casing of the preferred embodiment of the present application; Figure 2 is a schematic diagram of a leaf with a spline curve at the tip; Figure 3 is a schematic diagram of the cutting direction during blade tip machining in a preferred embodiment of the present application; Figure 4 It is a structural schematic diagram of the wax filling mechanism of the preferred embodiment of the present application; Figure 5 It is a schematic diagram of the installation of the storage plate of the preferred embodiment of the present application; Figure 6 This is a schematic diagram of the internal structure of the wax filling box of the preferred embodiment of the present application; Figure 7 is a schematic diagram of the installation of a sliding support member of a preferred embodiment of the present application; Figure 8 It is a structural schematic diagram of a storage groove of a preferred embodiment of the present application; Fig. 9It is a schematic diagram of the storage of the wax injection tube according to the preferred embodiment of the present application.

[0045] An axial flow casing combined blade tip processing device includes a wax filling mechanism for filling wax on an axial flow casing 100 to wrap and fix its guide vanes 101 and stationary vanes 102 and expose the blade tips. The wax filling mechanism includes a workbench 1, a wax filling box 2, a storage plate 3, a wax injection pipe 4 and a limit assembly 6:

[0046] A mounting plate 11 is supported on the workbench 1, and a wax filling box 2 is installed on the side wall of the mounting plate 11. An electric heating component for heating and melting wax blocks is arranged in the wax filling box 2. A mounting opening 12 is opened on the workbench 1, and a storage plate 3 is rotatably arranged in the mounting opening 12. The storage plate 3 is used to support the axial flow casing 100. The wax filling pipe 4 is connected to the wax outlet pipe 22 of the wax filling box 2, and the wax filling pipe 4 is used to fill the axial flow casing 100 with wax;

[0047] A storage groove 24 is provided at the bottom of the base plate of the wax filling box 2, which is used to accommodate the wax injection tube 4 and introduce the heat in the wax filling box 2 to the wax injection tube 4 to prevent the wax liquid from solidifying inside the wax injection tube 4. The limit component 6 is arranged in the storage groove 24, and the limit component 6 is used to clamp and limit the wax injection tube 4.

[0048] Here, the "wax filling box 2" means a structure for containing wax blocks, melting wax blocks and keeping them warm. In some embodiments, the wax filling box 2 is a box structure with an open top and a wax outlet pipe 22 at the bottom. Optionally, a filter 23 is provided at the top of the wax outlet pipe 22 to reduce the amount of impurities that enter the wax filling pipe 4 through the wax outlet pipe 22 and cause blockage. The wax filling pipe 4 can be connected to the wax outlet pipe 22 through a transfer pipe 5.

[0049] The present application discloses an axial flow casing combined blade tip processing device that can realize fast and stable wax filling operation on the axial flow casing 100, wrap and fix the guide vanes 101 and the stationary blades 102 with wax liquid and expose the blade tip to be processed, so that the subsequent process can process the blade tip by cutting. It effectively solves the problem that in the blade tip processing process, the blade is a thin-walled part with a small thickness of the blade tip, and the turning force is too large during turning, which can easily cause the blade to deform, bend and become scrapped. At the same time, it can also avoid the blade being in a suspended state during the processing, poor rigidity, easy vibration and tool vibration during turning, and difficulty in ensuring the required blade tip runout value.

[0050] It should be noted that since the wax injection tube 4 needs to inject the wax liquid into the wax injection area in the axial flow casing 100, and the wax liquid is easily solidified by cold, the wax injection is not smooth, which affects the processing efficiency. In addition, after the wax injection is completed, the wax liquid remaining in the wax injection tube 4 is prone to solidification and blockage, and additional work such as cleaning is required frequently. In order to ensure the smooth flow of the wax injection tube 4, a storage groove 24 is opened at the bottom of the wax filling box 2. On the one hand, it can facilitate the storage of the wax injection tube 4, and on the other hand, it can also introduce the heat in the wax filling box 2 to the wax injection tube 4, so that the wax liquid in the wax injection tube 4 can avoid solidification and other phenomena, and the wax injection tube 4 can be taken and used immediately, which greatly improves the overall processing efficiency.

[0051] Preferably, please refer to Figure 6 , 8 As shown in FIG. 9 , the receiving groove 24 is a spiral disc structure, and a heat conducting sheet is provided on the side wall of the receiving groove 24 .

[0052] It is understandable that the spiral disk-shaped storage groove 24 can facilitate the winding and storage of the wax injection tube 4, so as to straighten the wax injection tube 4 and prevent the wax injection tube 4 from being easily tangled, and can also evenly introduce the internal capacity of the wax filling box 2 to the wax injection tube 4 to prevent the residual wax inside the wax injection tube 4 from condensing into blocks. The heat conducting sheet can improve the heat conduction efficiency and ensure the temperature of the wax injection tube 4 in cold conditions such as winter.

[0053] Preferably, please refer to Figure 6 , 8 As shown in FIG. 9 , the limiting assembly 6 is provided with a plurality of groups and is spaced apart in the receiving groove 24 . The limiting assembly 6 includes limiting members 61 arranged in pairs. The limiting members 61 are arc-shaped plate structures. The limiting members 61 arranged in pairs are used to clamp and limit the wax injection tube 4 .

[0054] It can be understood that when the wax injection tube 4 is coiled and stored in the storage groove 24, the wax injection tube 4 can be conveniently clamped and limited by the paired limiting members 61. At the same time, the wax injection tube 4 can also be quickly disengaged from the clamping limit of the limiting member 61 by directly pulling it out, which facilitates the use and storage of the wax injection tube 4 and helps to improve the efficiency of the wax filling operation.

[0055] Optionally, the stopper 61 is an S-shaped plate structure, so that the bottom ends of the stoppers 61 on both sides are open, which is convenient for inserting the wax injection tube 4. In addition, the stopper 61 can be made of a flexible material, so that the stopper 61 is more elastic, which is conducive to improving the clamping and limiting effect of the stopper 61.

[0056] Preferably, please refer to Figure 4 , 5As shown in , 7, the placement plate 3 is arranged in the installation opening 12 through the rotating shaft 33 on both sides along the width direction, and the placement plate 3 is slidably provided with sliding support members 32 on both sides along the length direction. The sliding support members 32 are used to extend out of the placement plate 3 and abut against the workbench 1 when the placement plate 3 is in a horizontal state to support the placement plate 3 and limit the flipping of the placement plate 3.

[0057] In this preferred embodiment, both sides of the storage plate 3 along its length direction are provided with limit cavities 34, and the sliding support member 32 is slidably set in the limit cavity 34. The bottom surface of the storage plate 3 is located at the limit cavity 34 on both sides and is provided with locking members. The locking members are used to cooperate with the preset limit screw holes on the storage plate 3 and pass through the limit screw holes to tighten the sliding support member 32 to lock the sliding support member 32 to a limited position.

[0058] It is understandable that the placement plate 3 is installed in the installation opening 12 through the rotating shaft 33, and the placement plate 3 can be turned over so as to dump and clean the residual wax on the placement plate 3 to ensure the cleanliness of the working surface of the placement plate 3. When the placement plate 3 is in a horizontal state, in order to maintain the stability of the horizontal state of the placement plate 3 so as to stably support the parts, the sliding support members 32 on both sides of the placement plate 3 can be pulled out, and the sliding support members 32 abut against the top surface of the workbench 1 to support and limit the turning of the placement plate 3; when the placement plate 3 needs to be turned over, it is only necessary to push the sliding support member 32 into the limiting cavity 34, which is very convenient to operate.

[0059] The locking member can be a bolt, which cooperates with the limiting screw hole on the bottom surface of the storage plate 3, and the bolt passes through the limiting screw hole and then presses the sliding support member 32 to achieve the locking limit of the sliding support member 32, so as to adjust the position of the sliding support member 32 and realize the flipping or horizontal limit of the storage plate 3.

[0060] It should be noted that the sliding support member 32 is a plate-like structure, and the width of the sliding support member 32 can be widened to increase the contact area between the sliding support member 32 and the top surface of the workbench 1 , which is beneficial to improving the stability of the support limit of the sliding support member 32 .

[0061] Preferably, please refer to Figure 4 As shown, limiting bosses 31 are provided on both sides of the top of the placement plate 3, and the limiting bosses 31 on both sides are used to limit and clamp the axial flow casing 100. The limiting bosses 31 on both sides are also used to collect and guide the wax liquid remaining on the top of the placement plate 3 to the middle of the placement plate 3. A residual wax collection box is provided under the workbench 1, and the residual wax collection box is used to receive and collect the residual wax liquid flowing down after the placement plate 3 is turned over.

[0062] It is understandable that the limiting bosses 31 are provided on both sides of the bottom of the storage plate 3. On the one hand, the limiting bosses 31 can play a certain limiting role on the axial flow casing 100, and on the other hand, the limiting bosses 31 can also gather the residual wax liquid to the middle of the storage plate 3 to facilitate subsequent cleaning. The top surface of the limiting boss 31 is an inclined surface structure inclined toward the middle of the storage plate 3.

[0063] Optionally, a heating plate is provided inside the storage plate 3 to reduce the condensation of wax blocks on the surface of the storage plate 3 and facilitate the cleaning of residual wax.

[0064] According to another aspect of the present application, a method for machining a combined blade tip of an axial flow casing is provided, using the above-mentioned combined blade tip machining device of the axial flow casing, and comprising the following steps:

[0065] S100, wax is poured into the axial flow casing 100 through a wax pouring mechanism, so that the wax wraps and fixes the guide vanes 101 and the stationary vanes 102, and exposes the blade tip portion to be processed;

[0066] S200, after the wax is completely solidified, the parts are clamped on the CNC lathe;

[0067] S300, cutting the blades of each level of the axial flow casing 100 separately, with the cutting direction of the blade being from the blade basin to the blade back;

[0068] S400, after the blade tip turning is completed, the axial flow casing 100 is placed in a wax melting pool for wax melting, and the wax layer is completely removed.

[0069] The processing method of the combined blade tip of the axial flow casing of the present application also has the above-mentioned beneficial effects. It also includes a solution of turning the blade tip based on the problems existing in the previous grinding processing of the combined blade tip of the axial flow casing. The turning processing has no requirements on the composition shape of the blade tip points, and can be an oblique line, a broken line or a spline curve. The blade tip contour and runout size after processing by the processing method of the present application can meet the design requirements and meet the processing needs. The processing time is shortened to 1.5 shifts, and adaptive processing can be performed for different blade tip shapes (the blade tip point is an oblique line, a broken line or a spline curve). The switching is very convenient, which improves the processing efficiency while ensuring the processing quality of the parts, and can meet the processing requirements of different blade tip shapes.

[0070] In this application, the cutting direction is optimized according to the structural characteristics of the blade. Since the blade is arc-shaped, the blade cutting direction is selected from the blade basin to the blade back. The arc-shaped structural characteristics of the blade itself are used to offset part of the cutting force and avoid deformation of the blade tip.

[0071] Preferably, in step S300, when cutting the blades at each level, the first cutting is performed by back-cutting to avoid cutting deformation caused by excessive cutting depth due to uneven margin.

[0072] It is understandable that since the blade is a thin-walled part, and the blade tip is thinner and more fragile, and the cutting force is usually greater, it is easy to cause uneven cutting allowance during the cutting process, resulting in excessive cutting depth at the blade tip and cutting deformation. Therefore, when cutting the blade tip, the first cut is back-cut to avoid deformation caused by excessive cutting depth due to uneven allowance.

[0073] Preferably, the cutting parameters in step S300 are: linear speed 50-55 m / min, feed rate 0.1-0.12 mm / min, cutting depth: 0.05-0.1 mm.

[0074] It should be noted that the present application has lowered the cutting parameters and cutting force compared to the usual blade cutting processing parameters, which is beneficial to reduce the phenomenon of easy deformation of the blade tip during processing, ensures that the blade tips with different blade tip shapes (the blade tip points are oblique lines, broken lines or spline curves) can be processed smoothly, and ensures the qualified delivery of parts.

[0075] Preferably, the arc R angle of the cutting blade used in the cutting process in step S300 is not greater than 0.4.

[0076] It is understandable that an R angle that is too large will produce a large cutting force, which may easily cause the blade tip to deform and become scrapped. This application appropriately reduces the cutting parameters and cutting force according to the different blade materials. At the same time, the use of sharper small R angle tools for processing can further reduce the cutting force. Ultimately, the coordination of multiple measures ensures that the blade tip is processed with high quality.

[0077] After the parts are waxed, use sandpaper to remove the burrs on the blade tip; after the final inspection, the parts can be put into storage.

[0078] It should be noted that based on the problems existing in the grinding of the blade tips of the axial flow casing combination, we proposed a solution of turning the blade tips. The turning process has no requirements on the shape of the blade tip points, and it can be an oblique line, a broken line or a spline curve.

[0079] However, turning has a greater cutting force than grinding, and the blade is a thin-walled part, with the thickest wall thickness at the tip not exceeding 2mm and the thinnest part only 0.2mm. Excessive turning force during turning can easily cause the blade to deform, bend and become scrapped. In addition, the blade is suspended on the axial flow casing, with poor rigidity, which can easily cause vibration and blade vibration during turning, and the blade tip runout value requirement is difficult to guarantee. In order to avoid bending and scrapping of the blade tip during turning, and to ensure the dimensional accuracy of the blade tip, we have improved the processing technology, improved the blade processing rigidity from the process, added wax filling by fitters before turning, and controlled the cutting force through processing parameters. In addition, the use of sharper small R angle tools for processing can further reduce the cutting force. In addition, the cutting direction is optimized according to the structural characteristics of the blade. Because the blade is arc-shaped, the blade cutting direction is selected from the blade basin to the blade back, and the deformation caused by the cutting force is offset by the blade's own structural characteristics. Through the above measures, this application proposes a method of machining blade tips by turning according to the machining requirements and difficulties of the combined blade tips of the axial flow casing of an aircraft engine, which improves the machining efficiency while ensuring the machining quality of the parts and can meet the machining requirements of different blade tip shapes.

[0080] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0081] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection of this application.

Claims

1. An axial flow casing combined blade tip processing device, characterized in that: The invention comprises a wax filling mechanism for filling an axial flow casing (100) with wax so as to wrap and fix the guide vanes (101) and the stationary vanes (102) thereof and expose the blade tips. The wax filling mechanism comprises a workbench (1), a wax filling box (2), a storage plate (3), a wax filling pipe (4) and a limit assembly (6): A mounting plate (11) is supported on the workbench (1), a wax filling box (2) is mounted on the side wall of the mounting plate (11), an electric heating component for heating and melting wax blocks is arranged in the wax filling box (2), a mounting opening (12) is opened on the workbench (1), a storage plate (3) is rotatably arranged in the mounting opening (12), the storage plate (3) is used to support the axial flow casing (100), a wax filling pipe (4) is connected to a wax outlet pipe (22) of the wax filling box (2), and the wax filling pipe (4) is used to fill the axial flow casing (100) with wax; A receiving groove (24) is provided at the bottom of the bottom plate of the wax filling box (2). The receiving groove (24) is used to receive the wax filling tube (4) and to introduce heat in the wax filling box (2) into the wax filling tube (4) to prevent the wax liquid from solidifying inside the wax filling tube (4). A limiting component (6) is arranged in the receiving groove (24). The limiting component (6) is used to clamp and limit the wax filling tube (4).

2. The axial flow casing combined blade tip processing device according to claim 1, characterized in that: The receiving groove (24) is a spiral disc structure, and a heat conducting sheet is arranged on the side wall of the receiving groove (24).

3. The axial flow casing combined blade tip processing device according to claim 1, characterized in that: The limiting components (6) are provided with a plurality of groups and are arranged at intervals in the receiving groove (24). The limiting components (6) include limiting members (61) arranged in pairs. The limiting members (61) are arc-shaped plate structures. The limiting members (61) arranged in pairs are used to clamp and limit the wax injection tube (4).

4. The axial flow casing combined blade tip processing device according to claim 1, characterized in that: The storage plate (3) is arranged in the installation opening (12) via rotating shafts (33) on both sides along the width direction thereof, and sliding support members (32) are slidably arranged on both sides along the length direction thereof. The sliding support members (32) are used to extend out of the storage plate (3) and abut against the workbench (1) when the storage plate (3) is in a horizontal state so as to support the storage plate (3) and limit the flipping of the storage plate (3).

5. The axial flow casing combined blade tip processing device according to claim 4, characterized in that: The storage plate (3) is provided with limiting cavities (34) on both sides along its length direction, and the sliding support member (32) is slidably arranged in the limiting cavities (34). The bottom surface of the storage plate (3) is provided with locking members at the limiting cavities (34) on both sides, and the locking members are used to cooperate with the limiting screw holes preset on the storage plate (3) and pass through the limiting screw holes to tighten the sliding support member (32) so as to lock the sliding support member (32) in a limited position.

6. The axial flow casing combined blade tip processing device according to claim 1, characterized in that: Limiting bosses (31) are arranged on both sides of the top of the storage plate (3), and the limiting bosses (31) on both sides are used to limit and clamp the axial flow casing (100). The limiting bosses (31) on both sides are also used to collect and guide the wax liquid remaining on the top of the storage plate (3) to the middle of the storage plate (3). A residual wax collection box is arranged below the workbench (1), and the residual wax collection box is used to receive and collect the residual wax liquid flowing down after the storage plate (3) is turned over.

7. A method for machining a combined blade tip of an axial flow casing, characterized in that: The axial flow casing combined blade tip processing device according to any one of claims 1 to 6 is used, and the axial flow casing combined blade tip processing method comprises the following steps: S100, waxing the axial flow casing (100) through a wax filling mechanism, so that the wax wraps and fixes the guide vane (101) and the stationary vane (102), and exposes the blade tip portion to be processed; S200, after the wax is completely solidified, the parts are clamped on the CNC lathe; S300, cutting the blades of each level of the axial flow casing (100) separately, wherein the cutting direction is from the blade basin to the blade back; S400, after the blade tip turning is completed, the axial flow casing (100) is placed in a wax melting pool for wax melting, and the wax layer is completely removed.

8. The method for machining an axial flow casing combined blade tip according to claim 7, characterized in that: In step S300, when cutting the blades at each level, the first cutting is performed by backing off to avoid cutting deformation caused by excessive cutting depth due to uneven margin.

9. The method for machining an axial flow casing combined blade tip according to claim 7, characterized in that: The cutting parameters in step S300 are: linear speed 50-55 m / min, feed rate 0.1-0.12 mm / min, cutting depth: 0.05-0.1 mm.

10. The method for machining an axial flow casing combined blade tip according to claim 7, characterized in that: The arc R angle of the cutting blade used in the cutting process in step S300 is not greater than 0.4.

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