Axial flow casing combined blade tip processing device and processing method

Abstract

The application discloses an axial-flow machine casing combined blade tip processing device and a processing method, and belongs to the technical field of aero-engine part processing. The device comprises a wax pouring mechanism for pouring wax on the axial-flow machine casing to fix the guide vanes and the stationary vanes of the axial-flow machine casing and expose the blade tips, wherein the wax pouring mechanism comprises a workbench, an electric heating assembly for heating and melting wax blocks is arranged in a wax pouring box, a mounting hole is formed in the workbench, a storage plate is rotatably arranged in the mounting hole, and a wax injection pipe is used for pouring wax on the axial-flow machine casing. A storage groove is formed in the bottom of the bottom plate of the wax pouring box, the storage groove is used for storing the wax injection pipe and guiding heat in the wax pouring box into the wax injection pipe to prevent wax liquid in the wax injection pipe from solidifying, a limiting assembly is arranged in the storage groove, and the limiting assembly is used for clamping and limiting the wax injection pipe. The application aims to solve the problems of low grinding processing efficiency of the axial-flow machine casing combined blade tip and the fact that a grinding spline curve cannot be processed, so as to improve the processing efficiency and meet the processing requirements of new blade tips.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aircraft engine part machining, in particular to a combined blade tip machining device for an axial flow casing. In addition, the present application also relates to a machining method comprising the combined blade tip machining device for the axial flow casing. BACKGROUND

[0002] The information provided in this section is for the purpose of generally presenting the context of the application. The work of the presently named inventors, to the extent the descriptions are described in this section, as well as aspects of the descriptions may not constitute prior art to the present application, either expressly or by implication.

[0003] The compressor part of an aircraft engine is mainly composed of a compressor rotor assembly and an axial flow casing assembly, wherein the axial flow casing assembly is composed of a primary guide vane and multiple stages of static vanes. The gap amount between the guide vane and the static vane and the compressor rotor assembly needs to be strictly controlled. A large gap amount will affect the compression performance of the compressor airflow, and a small gap amount will cause the vane to be scratched by the high-speed rotating compressor rotor part during engine operation, resulting in the vane being knocked off and the engine being 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 the blade, and the dimension chain is long and the error is large. In order to ensure the accurate gap amount between the blade tip and the compressor rotor assembly, the blade tip needs to be ground after the axial flow casing assembly is assembled with the guide vane and the static vane, to ensure the consistency and accuracy of the distance from the blade tip of each stage to the center of the casing. The size requirements of the ground blade tip are as follows: the linear profile of the blade tip is 0.04-0.06mm, and the radial circular runout is 0.02-0.03mm.

[0005] At present, the blade tip machining method of axial flow casing assemblies of various types adopts grinding for machining. According to the given blade tip point position and angle, the grinding wheel is ground to a certain angle or the spindle is offset to a certain angle to grind the blade tip, so as to meet the design requirements of size and precision. The machining quality of grinding is good and can meet the high size precision of design. However, the following problems exist:

[0006] 1. Low efficiency, small cutting amount of grinding machining, low efficiency, and the axial flow casing assembly is generally composed of a primary guide vane and multiple stages of static vanes, and the internal space of the casing is limited. Some blades cannot be machined by offsetting the spindle angle, but only by grinding the grinding wheel. When the angle is large, the grinding amount of the grinding wheel is large and it is time-consuming. In addition, the point position and angle of each blade are not consistent, and the grinding wheel needs to be ground multiple times to complete the machining of one casing. At present, it takes about two shifts to machine one combined blade tip of the axial flow casing by using the grinding method.

[0007] 2. Grinding with a dressing wheel can only machine blades with beveled edges at the blade tip. For blades with spline edges (as per the instruction manual), it cannot be used. Figure 2 As shown, the blade tip is a spline curve, and it cannot be machined by grinding the grinding wheel or adjusting the spindle angle.

[0008] The aforementioned grinding problems of axial flow casing blade tips for aero-engines can no longer meet the processing requirements of existing casing blade tip models. Therefore, after long-term research and experimentation, we have developed a new axial flow casing blade tip processing device and method to address the issues of low grinding efficiency and inability to process grinding spline curves, thereby improving processing efficiency and meeting the processing requirements of new blade tips.

[0009] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0010] In view of at least one of the above technical problems, this application provides an axial flow casing assembly blade tip machining device, which aims to solve the problems of low grinding efficiency and inability to machine grinding spline curves in axial flow casing assembly blade tips, so as to improve machining efficiency and meet the new blade tip machining requirements.

[0011] This application also provides a processing method using the above-mentioned axial flow casing combined blade tip processing device.

[0012] According to one aspect of this application, an axial flow casing assembly blade tip processing apparatus is provided, including a wax-filling mechanism for wax-filling the axial flow casing to wrap and fix its guide vanes and stationary vanes, exposing the blade tips. The wax-filling mechanism includes a worktable, a wax-filling box, a storage plate, a wax-filling tube, and a limiting assembly.

[0013] A mounting plate is provided on the workbench, and a wax filling box is installed on the side wall of the mounting plate. The wax filling box is equipped with an electric heating element for heating and melting wax blocks. An installation port is provided on the workbench, and a shelf is rotatably installed in the installation port. The shelf is used to support the axial flow casing. The wax injection pipe is connected to the wax outlet pipe of the wax filling box. The wax injection pipe is used to fill the axial flow casing with wax.

[0014] The bottom plate of the wax filling box has a storage groove, which is used to store the wax injection tube and conduct the heat in the wax filling box to the wax injection tube to prevent the wax inside the wax injection tube from solidifying. The limiting component is set in the storage groove and is used to clamp and limit the wax injection tube.

[0015] In some embodiments of this application, the receiving groove has a spiral disc structure, and the sidewall of the receiving groove is provided with a heat-conducting sheet.

[0016] In some embodiments of the present application, the limiting assembly is provided with multiple sets and is arranged in the receiving groove at intervals, the limiting assembly comprises a pair of limiting members, the limiting member is an arc-shaped plate structure, and the pair of limiting members 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 mounting port through the rotating shaft at both sides along the width direction thereof, and the sliding support is arranged at both sides along the length direction of the storage plate, and the sliding support is used to extend outside the storage plate and abut against the workbench when the storage plate is in a horizontal state to support and limit the overturning of the storage plate.

[0018] In some embodiments of the present application, the limiting cavity is arranged at both sides along the length direction of the storage plate, the sliding support is arranged in the limiting cavity, and the bottom surface of the storage plate is provided with the locking member at both sides of the limiting cavity, and the locking member is used to cooperate with and pass through the limiting screw hole on the storage plate to tightly press the sliding support to lock and limit the sliding support.

[0019] In some embodiments of the present application, the limiting boss is arranged at both sides of the top of the storage plate, the limiting boss at both sides is used to limit and clamp the axial flow casing, and the limiting boss at both sides is also used to collect and guide the residual wax liquid at the top of the storage plate to the middle part of the storage plate, and the residual wax collecting box is arranged below the workbench and is used to receive and collect the residual wax liquid flowing down after the overturning of the storage plate.

[0020] According to another aspect of the present application, an axial flow casing combined blade tip machining method is also provided, which adopts the axial flow casing combined blade tip machining device, and comprises the following steps:

[0021] S100, wax is injected into the axial flow casing through the wax injection mechanism, so that the wax wraps and fixes the guide vanes and the stationary vanes and exposes the blade tip part to be machined;

[0022] S200, after the wax is completely solidified, the part is clamped on the numerical control lathe;

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

[0024] S400, after the blade tip is machined, the axial flow casing is placed in the wax melting pool to melt the wax, and the wax layer is completely removed.

[0025] In some embodiments of the present application, in step S300, when each stage of blade is machined, the first cutter adopts the tool retracting machining to avoid the cutting deformation caused by the excessive cutting amount due to the uneven allowance.

[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, and cutting depth 0.05-0.1 mm.

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

[0028] The present application has the following beneficial effects:

[0029] The axial flow casing combined blade tip processing device of the present application can realize rapid and stable wax pouring operation on the axial flow casing, wrap and fix the guide vanes and the stationary vanes with wax liquid, and expose the blade tip to be processed part, so that the blade tip is processed by cutting in the subsequent process, effectively solving the problem that the blade tip is deformed and bent and scrapped due to excessive turning force during turning of the blade tip in the blade tip processing process, and the thickness of the blade tip is small, and the blade is in a suspended state during processing, has poor rigidity, is easy to produce vibration and tool vibration during turning, and it is difficult to guarantee the blade tip runout value requirement and other problems.

[0030] The axial flow casing combined blade tip processing method of the present application also has the above beneficial effects. In addition, according to the problems existing in the previous axial flow casing combined blade tip grinding process, a turning blade tip scheme is proposed, and the turning process has no requirements for the shape of the blade tip point position, which can be a slanted line, a broken line or a spline curve. The blade tip profile and runout size after the processing method of the present application can meet the design requirements and processing requirements, the processing time is shortened to 1.5 shifts, and adaptive processing can be performed for different blade tip shapes (blade tip point position is a slanted line, a broken line or a spline curve), and the switching is very convenient, which improves the processing efficiency, ensures the part processing quality, and meets the processing requirements of different blade tip shapes.

[0031] Of course, implementing any product of the present application does not necessarily require all the advantages described above. In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

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

[0033] Figure 1 is a schematic view of the wax pouring area of the axial flow casing of the preferred embodiment of the present application;

[0034] Figure 2 is a schematic view of a blade with a spline curve blade tip;

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

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

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

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

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

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

[0041] Figure 9 is a storage schematic diagram of the wax injection pipe of the preferred embodiment of the present application;

[0042] Legend: 100, axial flow casing; 101, guide vane; 102, stationary vane; 1, workbench; 11, mounting plate; 12, mounting port; 2, wax pouring 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 pipe; 5, adapter pipe; 6, limiting assembly; 61, limiting piece. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following.

[0044] Figure 1 is a schematic diagram of the wax pouring area of the axial flow casing of the preferred embodiment of the present application; Figure 2 is a schematic diagram of the blade with a spline curve tip; Figure 3 is a schematic diagram of the cutting direction in the tip machining process of the preferred embodiment of the present application; Figure 4 is a structural schematic diagram of the wax pouring mechanism of the preferred embodiment of the present application; Figure 5 is a mounting schematic diagram of the storage plate of the preferred embodiment of the present application; Figure 6 is a structural schematic diagram of the internal structure of the wax pouring box of the preferred embodiment of the present application; Figure 7 is a mounting schematic diagram of the sliding support of the preferred embodiment of the present application; Figure 8 is a structural schematic diagram of the storage groove of the preferred embodiment of the present application; Figure 9is a schematic view of a wax injection tube storage of a preferred embodiment of the present application.

[0045] A combined tip processing device of an axial flow casing includes a wax injection mechanism for injecting wax into the axial flow casing 100 to fix the guide vanes 101 and the stationary vanes 102 and expose the tips, the wax injection mechanism includes a workbench 1, a wax injection box 2, a storage plate 3, a wax injection tube 4, and a limiting assembly 6:

[0046] The mounting plate 11 is arranged on the workbench 1, the wax injection box 2 is arranged on the side wall of the mounting plate 11, the electric heating assembly for melting the wax block is arranged in the wax injection box 2, the mounting hole 12 is arranged on the workbench 1, the storage plate 3 is rotatably arranged in the mounting hole 12, the storage plate 3 is used for supporting the axial flow casing 100, the wax injection tube 4 is connected with the wax outlet pipe 22 of the wax injection box 2, and the wax injection tube 4 is used for injecting wax into the axial flow casing 100.

[0047] The bottom of the bottom plate of the wax injection box 2 is provided with a storage groove 24, the storage groove 24 is used for storing the wax injection tube 4 and guiding the heat in the wax injection box 2 into the wax injection tube 4 to prevent the wax liquid in the wax injection tube 4 from solidifying, and the limiting assembly 6 is arranged in the storage groove 24 and is used for clamping and limiting the wax injection tube 4.

[0048] Here, the meaning of the "wax injection box 2" refers to a structure for containing a wax block and melting and keeping the wax block warm, in some embodiments, the wax injection box 2 is a box structure with an open top and a wax outlet pipe 22 at the bottom. Optionally, a filter screen 23 is arranged at the top of the wax outlet pipe 22, which can reduce the impurities entering the wax injection tube 4 through the wax outlet pipe 22 to cause blockage. The wax injection tube 4 can communicate with the wax outlet pipe 22 through the adapter pipe 5.

[0049] The combined tip processing device of the axial flow casing can realize rapid and stable wax injection operation on the axial flow casing 100, fix the guide vanes 101 and the stationary vanes 102 through the wax liquid, and expose the tip to be processed, so that the tip is processed by cutting in the subsequent process, effectively solves the problem that the blade is a thin-walled part, the thickness of the tip is small, and the turning force is too large during turning, which easily causes the blade to deform and bend and be scrapped, and also avoids the blade in the processing process in the suspended state, poor rigidity, and easily produces vibration and vibration during turning, and the tip jump value is difficult to guarantee.

[0050] It should be noted that, since the wax injection pipe 4 needs to inject wax liquid into the wax injection area of the axial flow casing 100, the wax liquid is prone to solidification due to cold, which affects the efficiency of processing. In addition, after the wax injection pipe 4 completes the wax injection, the residual wax liquid in the wax injection pipe 4 is prone to solidification and blockage, which requires frequent cleaning and other additional work. In order to ensure the smoothness of the wax injection pipe 4, a storage groove 24 is provided at the bottom of the wax injection box 2. On the one hand, it can conveniently store the wax injection pipe 4, and on the other hand, it can also guide the heat in the wax injection box 2 to the wax injection pipe 4, so that the wax liquid in the wax injection pipe 4 avoids solidification and other phenomena, and the wax injection pipe 4 can be taken immediately, which greatly improves the overall processing efficiency.

[0051] Preferably, please refer to Figure 6 、 8 , 9, the storage groove 24 is a spiral disc structure, and the side wall of the storage groove 24 is provided with a heat conduction sheet.

[0052] It can be understood that the spiral disc-shaped storage groove 24 can conveniently wind and store the wax injection pipe 4, facilitate the straightening of the wax injection pipe 4, avoid the easy winding of the wax injection pipe 4, and also uniformly guide the internal capacity of the wax injection box 2 to the wax injection pipe 4, avoiding the phenomenon of residual wax in the wax injection pipe 4 from coagulating into blocks. The heat conduction sheet can improve the heat conduction efficiency and ensure the temperature of the wax injection pipe 4 in cold conditions such as winter.

[0053] Preferably, please refer to Figure 6 、 8 , 9, the limiting assembly 6 is provided with multiple groups and is arranged in the storage groove 24, and the limiting assembly 6 includes a pair of limiting pieces 61, which are arc-shaped plate structures. The pair of limiting pieces 61 are used for clamping and limiting the wax injection pipe 4.

[0054] It can be understood that when the wax injection pipe 4 is wound and stored in the storage groove 24, the pair of limiting pieces 61 can conveniently clamp and limit the wax injection pipe 4, and the wax injection pipe 4 can also quickly separate from the clamping and limiting of the limiting piece 61 by directly pulling out, which is convenient for taking and storing the wax injection pipe 4 and is beneficial to improving the efficiency of the wax injection operation.

[0055] Optionally, the limiting piece 61 is an S-shaped plate structure, the bottom ends of the two limiting pieces 61 are open, and the wax injection pipe 4 is conveniently clamped. In addition, the limiting piece 61 can be made of flexible material, so that the limiting piece 61 has more elasticity, which is beneficial to improve the clamping and limiting effect of the limiting piece 61.

[0056] Preferably, please refer to Figure 4 、 5, 7, the storage plate 3 is provided in the mounting port 12 through the rotating shaft 33 along the width direction of the storage plate 3, the sliding support 32 is slidingly provided on the two sides of the storage plate 3 along the length direction of the storage plate 3, and the sliding support 32 is used to extend outside the storage plate 3 and abut against the workbench 1 when the storage plate 3 is in the horizontal state, so as to support and limit the turning of the storage plate 3.

[0057] In the preferred embodiment, the limiting cavity 34 is formed on the two sides of the storage plate 3 along the length direction of the storage plate 3, the sliding support 32 is slidingly provided in the limiting cavity 34, and the locking member is arranged on the bottom surface of the storage plate 3 at the limiting cavity 34 on the two sides. The locking member is used to cooperate with the limiting screw hole on the storage plate 3 and abut against the sliding support 32 after penetrating through the limiting screw hole, so as to lock and limit the sliding support 32.

[0058] It can be understood that the storage plate 3 is installed in the mounting port 12 through the rotating shaft 33, and the turning of the storage plate 3 can be realized, so as to pour and clean the residual wax on the storage plate 3 and ensure the cleanliness of the working surface of the storage plate 3. When the storage plate 3 is in the horizontal state, in order to maintain the stability of the horizontal state of the storage plate 3 and stably support the parts, the sliding support 32 on the two sides of the storage plate 3 can be pulled out, the top surface of the workbench 1 is abutted through the sliding support 32, and the support and turning limiting effect of the storage plate 3 is realized. When the storage plate 3 needs to be turned, the sliding support 32 can be pushed into the limiting cavity 34, and the operation is very convenient.

[0059] The locking member can be a bolt, which is used to cooperate with the limiting screw hole on the bottom surface of the storage plate 3 and abut against the sliding support 32 after penetrating through the limiting screw hole, so as to lock and limit the sliding support 32. The position of the sliding support 32 can be adjusted, the turning or horizontal limiting of the storage plate 3 can be realized, and the stability of the support and limiting of the sliding support 32 is improved.

[0060] It should be noted that the sliding support 32 is in a plate structure, and the width of the sliding support 32 can be widened, so as to increase the contact area between the sliding support 32 and the top surface of the workbench 1, and the stability of the support and limiting of the sliding support 32 is improved.

[0061] Preferably, as shown in Figure 4 The limiting boss 31 is arranged on the top of the storage plate 3, the limiting boss 31 on the two sides is used to limit and clamp the axial flow casing 100, and the limiting boss 31 on the two sides is also used to collect and guide the residual wax liquid on the top of the storage plate 3 to the middle part of the storage plate 3. The residual wax collecting box is arranged below the workbench 1 and is used to receive and collect the residual wax liquid flowing down after the storage plate 3 is turned.

[0062] It can be understood that the limiting boss 31 is arranged on both sides of the bottom of the storage plate 3. On the one hand, the limiting boss 31 can limit the axial flow machine casing 100 to a certain extent. On the other hand, the limiting boss 31 can also converge the residual wax to the middle part of the storage plate 3, which is convenient for subsequent cleaning. The top surface of the limiting boss 31 is a slope structure inclined to the middle part of the storage plate 3.

[0063] Optionally, a heating plate is arranged in the inside of the storage plate 3, which can reduce the phenomenon of wax block condensation 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 combined blade tip machining method for an axial flow machine casing is also provided, which adopts the combined blade tip machining device for the axial flow machine casing described above, and includes the following steps:

[0065] S100, waxing the axial flow machine casing 100 by the waxing mechanism, so that the wax fixes the guide vanes 101 and the stationary vanes 102, and exposes the blade tip part to be machined;

[0066] S200, after the wax is completely solidified, the part is clamped on the numerical control lathe;

[0067] S300, each stage of blade of the axial flow machine casing 100 is separately machined by cutting, and the cutting direction is that the blade cuts from the blade basin to the blade back;

[0068] S400, after the blade tip cutting is completed, the axial flow machine casing 100 is placed in the wax melting pool to melt the wax, and the wax layer is completely removed.

[0069] The combined blade tip machining method for the axial flow machine casing also has the beneficial effects described above. In view of the problems existing in the combined blade tip grinding machining of the axial flow machine casing in the prior art, the present application proposes a scheme of machining the blade tip by turning. The turning machining has no requirement on the shape of the blade tip point, which can be a slanted line, a broken line or a spline curve. The profile degree and the run-out size of the blade tip machined by the machining method of the present application can meet the design requirements and the machining requirements, the machining time is shortened to 1.5 shifts, and the machining method of the present application can be adapted to different blade tip shapes (the blade tip point is a slanted line, a broken line or a spline curve), which is very convenient to switch, improves the machining efficiency, ensures the machining quality of the part, and meets the machining requirements of different blade tip shapes.

[0070] In the present application, the cutting direction is optimized according to the structural characteristics of the blade. Since the blade is arc-shaped, the cutting direction of the blade is selected to be 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, so as to avoid the deformation of the blade tip.

[0071] Preferably, in step S300, the first tool cutting adopts the tool retracting machining when each stage of blade is machined, so as to avoid the cutting deformation caused by the excessive cutting amount due to the uneven allowance.

[0072] It can be understood that, since the blade is a thin-walled part, and the blade tip is thinner and more fragile, and the cutting force is usually large, it is easy to cause uneven cutting allowance in the cutting process, thereby causing the blade tip to be deformed due to excessive cutting allowance.

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

[0074] It should be noted that the cutting parameters of the present application are lower than the usual blade cutting parameters, which reduces the cutting force and helps to reduce the deformation of the blade tip during machining, ensures the successful machining of the blade tip with different blade tip shapes (blade tip point positions are straight lines, broken lines or spline curves), and ensures the qualified delivery of the parts.

[0075] Preferably, the cutting blade used in step S300 has a circular arc R angle of not more than 0.4.

[0076] It can be understood that, excessive R angle will generate a larger cutting force, which will easily cause the blade tip to be deformed and scrapped. According to the different blade materials, the present application appropriately reduces the cutting parameters to reduce the cutting force, and uses a more sharp small R angle cutter for machining, which can further reduce the cutting force, and finally multiple measures are used to ensure the high-quality completion of the blade tip machining.

[0077] After the part is waxed, the blade tip burrs are removed with sandpaper; and after final inspection, the part can be put into storage.

[0078] It should be noted that, according to the problems existing in the grinding machining of the combined blade tip of the axial flow casing, a turning blade tip scheme is proposed, and the turning machining has no requirements for the shape of the blade tip point position, which can be a straight line, a broken line or a spline curve.

[0079] But compared with grinding, the cutting force of turning is larger, and the blade is a thin-walled part, the wall thickness at the blade tip is not more than 2mm, and the thinnest part is only 0.2mm, so the turning force is too large to easily cause the blade to deform and bend and be scrapped; in addition, the blade is suspended on the axial flow casing and has poor rigidity, so vibration and tool vibration are easily generated during turning, and it is difficult to guarantee the blade tip runout value. In order to avoid bending and scrapping of the blade tip during turning, while ensuring the dimensional accuracy of the blade tip, the processing technology is improved, the rigidity of the blade processing is improved from the process, the jigging wax is added before turning, the cutting force is controlled through the processing parameters, and the more sharp small R angle cutter is used for processing, which can further reduce the cutting force; in addition, the cutting direction is optimized according to the structural characteristics of the blade, the blade is arc-shaped, the cutting direction of the blade is selected from the blade basin to the blade back, and the deformation caused by the cutting force is offset through the structural characteristics of the blade itself. Through the above measures, the application proposes a method for turning the blade tip according to the processing requirements and difficulties of the axial flow casing combined blade tip of the aero-engine, improves the processing efficiency, ensures the processing quality of the part, and can meet the processing requirements of different blade tip shapes.

[0080] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that processes, methods, articles or devices that include a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or devices.

[0081] The principles and implementation modes of the application are described by specific examples in this document, and the above examples are only used to help understand the method and its core idea. The above description is only the preferred embodiment of the application, and it should be pointed out that due to the limitation of language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, decorations or changes can be made without departing from the principles of the application, and the above technical features can be combined in a proper way; these improvements, decorations, changes or combinations, or the application of the inventive concept and technical scheme to other fields without improvement, shall be regarded as the protection of the application.

Claims

1. A combined tip machining device for axial flow casing, characterized in that, The application relates to a wax injection mechanism for injecting wax into an axial flow casing (100) to fix vanes (101) and stator vanes (102) of the axial flow casing (100) and expose blade tips, the wax injection mechanism comprising a workbench (1), a wax injection box (2), a storage plate (3), a wax injection pipe (4) and a limiting assembly (6). The workbench (1) is provided with a mounting plate (11), the wax injection box (2) is arranged on the side wall of the mounting plate (11), the wax injection box (2) is provided with an electric heating assembly for melting wax blocks, the workbench (1) is provided with a mounting opening (12), the storage plate (3) is rotatably arranged in the mounting opening (12), the storage plate (3) is used for supporting the axial flow casing (100), the wax injection pipe (4) is connected with a wax outlet pipe (22) of the wax injection box (2), and the wax injection pipe (4) is used for injecting wax into the axial flow casing (100). The bottom plate of the wax injection box (2) is provided with a receiving groove (24), the receiving groove (24) is used for receiving the wax injection pipe (4) and guiding heat in the wax injection box (2) into the wax injection pipe (4) to prevent wax liquid in the wax injection pipe (4) from solidifying, the limiting assembly (6) is arranged in the receiving groove (24), and the limiting assembly (6) is used for clamping and limiting the wax injection pipe (4); the receiving groove (24) is a spiral disc structure, the side wall of the receiving groove (24) is provided with a heat conduction sheet; the two sides of the storage plate (3) along the width direction of the storage plate (3) are arranged in the mounting opening (12) through rotating shafts (33), the two sides of the storage plate (3) along the length direction of the storage plate (3) are slidably provided with sliding support pieces (32), and the sliding support pieces (32) are used for extending out of the storage plate (3) and abutting against the workbench (1) when the storage plate (3) is in a horizontal state, so that the storage plate (3) is supported and the overturning of the storage plate (3) is limited.

2. A combination tip machining apparatus for a shrouded axial flow machine according to claim 1, wherein, The limiting assembly (6) is provided with multiple groups and is arranged in the receiving groove (24) at intervals, the limiting assembly (6) comprises a pair of limiting pieces (61), the limiting piece (61) is in an arc plate structure, and the pair of limiting pieces (61) are used for clamping and limiting the wax injection pipe (4).

3. A tip shaper for an axial flow casing combination as defined in claim 1, wherein The two sides of the storage plate (3) along the length direction of the storage plate (3) are provided with limiting cavities (34), the sliding support pieces (32) are slidably arranged in the limiting cavities (34), the bottom surface of the storage plate (3) is provided with locking pieces at the two sides of the limiting cavities (34), and the locking pieces are used for cooperating with and tightly pressing the sliding support pieces (32) through limiting screw holes on the storage plate (3) after the limiting screw holes are penetrated, so that the sliding support pieces (32) are locked and limited.

4. A tip shaper for an axial flow casing combination as defined in claim 1, wherein The two sides of the top of the storage plate (3) are provided with limiting bosses (31), the limiting bosses (31) on the two sides are used for limiting and clamping the axial flow casing (100), and the limiting bosses (31) on the two sides are also used for collecting and guiding residual wax liquid on the top of the storage plate (3) to the middle of the storage plate (3); a residual wax collecting box is arranged below the workbench (1), and the residual wax collecting box is used for receiving and collecting residual wax liquid flowing down after the storage plate (3) is overturned.

5. A method for machining the blade tip of an axial flow casing assembly, characterized in that, The axial flow casing combined blade tip machining device and the axial flow casing combined blade tip machining method have the following steps: S100, pouring wax 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 part to be machined; S200, after the wax is completely solidified, the part is clamped on a numerical control lathe; S300, the blade tips of the axial flow casing (100) are separately machined, and the cutting direction is from the blade basin to the blade back during machining; S400, after the blade tip turning is completed, the axial flow casing (100) is placed in a wax melting pool to melt the wax, and the wax layer is completely removed.

6. A method of combining tip machining of axial flow casings according to claim 5 wherein, In step S300, the first cutting adopts the tool retracting machining when the blade tips are machined, so that the cutting deformation caused by the excessive cutting amount due to the uneven allowance is avoided.

7. A method of combining tip machining of axial flow casings according to claim 5, wherein, In step S300, the cutting parameters are as follows: the linear speed is 50-55 m / min, the feed rate is 0.1-0.12 mm / min, and the cutting amount is 0.05-0.1 mm.

8. A method of combining tip machining of an axial flow casing according to claim 5, wherein, In step S300, the cutting blade used for the cutting machining has an arc R angle of not more than 0.4.

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