Axial flow casing coating hole and runner machining device and machining method

Abstract

The invention discloses an axial flow casing coating hole and runner machining device and method, and belongs to the technical field of aero-engine manufacturing, the axial flow casing coating hole and runner machining device comprises a small drill bit, a large drill bit and a first supporting piece, a middle through hole is formed in the first supporting piece, and the middle through hole is located above a piston piece and is an oil storage cavity; the limiting piece is used for abutting against and pressing an inner hole of the axial flow casing so as to support the axial flow casing, and a pressure adjusting cavity is formed in the limiting piece; the pushing assembly is used for pushing the piston piece to ascend and descend and pushing hydraulic oil in the oil storage cavity into the pressure adjusting cavity when the piston piece ascends, and then the pressure of the pressure adjusting cavity is increased to push the limiting piece to expand and press an inner hole of the axial flow case. On the contrary, when the piston piece descends, pressing and supporting of the limiting piece on the inner hole of the axial flow casing are released. In addition, the coating holes machined through the optimized machining method are good in smoothness, the coating is free of cracking and upheaval phenomena, meanwhile, the machined runner is small in deformation, and the process stability is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of aeroengine manufacturing technology, and in particular, to an axial flow casing coating hole and flow channel processing device. In addition, the present application also relates to a processing method including the axial flow casing coating hole and flow channel 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 axial flow casing of an aircraft engine is a thin-walled part with a wall thickness of about 2-3mm. It has poor rigidity and is easy to deform. It is an important component of a turboshaft engine. Its working principle is that the guide vanes and stator rings assembled on the axial flow casing work together with the rotor part to provide compressed air to the combustion chamber.

[0004] In order to facilitate the assembly of guide blades and stationary blade rings, the axial flow casing is generally designed as a half structure, that is, it consists of a left and right half casing; in order to adapt to the airflow and volume changes entering the casing, avoid airflow separation, and reduce energy loss, the inner wall of the casing is designed as a smooth streamlined flow channel; and at the assembly with the engine rotor blades, because the gap between the rotor blades and the flow channel is small, in order to avoid the thermal expansion and contraction of the engine during use causing the rotor blades to scrape against the part matrix, resulting in blade breakage, at the flow channel where the rotor blades are assembled, about 0.5-0.7mm of the matrix on one side is turned off, and the low-hardness aluminum silicon (AlSi) material is used to fill the area, and then the flow channel part is processed in place after spraying. In addition, in order to facilitate the observation of the internal parts of the axial flow casing, some models of axial flow casings will have peepholes processed in the spray layer area.

[0005] Please refer to the attached manual for the peephole of the existing axial flow casing coating. Figure 1 Take a certain type of axial flow casing made of stainless steel (ZG06Cr16Ni5Mo) as an example, the diameter of the peephole is Φ7, the depth is about 9.5mm, the coating thickness is about 0.6mm, and the processing method is as follows:

[0006] 1. Use a center drill to drill a guide hole in the center of the hole, about 1mm deep;

[0007] 2. Use a drill bit with a diameter of about Φ6.5mm to drill through the hole by pecking;

[0008] 3. Use a buried drill or boring tool to machine the hole diameter to the final size.

[0009] The holes processed by this method will cause local cracking or bulging of the coating at the coating outlet, which cannot meet the design requirements.

[0010] At the same time, the existing models of axial flow casing flow channel part size requirements have high precision requirements, generally: circular runout | 0.05 | A | B, contour | 0.1 | A | B, and spraying is required during processing. The total coating thickness after spraying is ≥ 2mm. A large amount of internal stress is generated on the casing body during the spraying process, causing the two halves of the casing to deform. The larger the casing size and the thinner the wall thickness, the greater the deformation. After the subsequent coating removes the excess, the parts need to be placed for a period of time after being disassembled. During this process, the internal stress between the coating and the substrate will be released, which will cause the parts to deform beyond the tolerance. The deformation is about 0.05-0.16mm. For deformation during coating processing, please refer to the attached manual. Figure 2 shown.

[0011] If the spraying process is carried out according to the conventional process method, the flow channel area after spraying is directly processed in one process, and the parts will be deformed due to insufficient stress release, which will cause the size to be out of tolerance and affect the engine performance. In addition, since the casing has different sizes, it is often necessary to clamp the casing with multiple sets of different clamping tools before processing, which is not conducive to reducing the overall production cost, and the clamping adjustment is not flexible and convenient, which affects the processing efficiency.

[0012] The quality problems existing in the coating hole and flow channel processing of the aircraft engine axial flow casing parts introduced above have become a major quality problem that needs to be solved urgently for a certain aircraft engine.

[0013] 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

[0014] In view of at least one of the above technical problems, the present application provides an axial flow casing coating hole and flow channel processing device, which can provide stable and tight support for axial flow casings of different sizes through a limiter, and can conveniently adjust the support outer diameter of the limiter to adapt to the compression and limit support of the inner holes of different axial flow casings.

[0015] At the same time, the present application also provides a processing method using the above-mentioned axial flow casing coating hole and flow channel processing device. The coating holes processed by the optimized processing method have good smoothness, and the coating has no cracking and bulging. At the same time, the processed flow channel has small deformation, and the process stability is greatly improved.

[0016] According to one aspect of the present application, an axial flow casing coating hole and flow channel processing device is provided, comprising a small drill bit, a large drill bit, a milling cutter and a boring cutter, the axial flow casing coating hole and flow channel processing device is used to clamp the axial flow casing so as to process the coating hole and the flow channel, the axial flow casing coating hole and flow channel processing device comprises a base, a first support member, a second support member, a stopper and a pushing assembly:

[0017] The first support member is arranged on the base, a middle through hole is opened in the first support member, a piston member is movably arranged in the middle through hole, and the middle through hole is located above the piston member to form an oil storage cavity, and the oil storage cavity is used to store hydraulic oil;

[0018] The second support members are arranged in an annular array on the top of the first support members, and the limiting members are arranged at the tail ends of the second support members. The limiting members are used to abut against and press the inner hole of the axial flow casing to support the axial flow casing. A pressure regulating cavity is provided in the limiting members, and an oil through hole is provided in the second support members. The oil through hole is used to connect the oil storage cavity with the pressure regulating cavity.

[0019] The middle through hole is located below the piston member as a limit cavity, and the pushing component is movably arranged in the limit cavity. The pushing component is used to push the piston member to rise and fall, and when the piston member rises, the hydraulic oil in the oil storage cavity is compressed and pushed into the pressure regulating cavity from the oil hole, thereby increasing the pressure in the pressure regulating cavity to push the limit member to expand and press the inner hole of the axial flow casing. Conversely, when the piston member descends, the limit member releases its pressing support on the inner hole of the axial flow casing.

[0020] In some embodiments of the present application, the pushing assembly includes an installation frame, a rotating member, a first pushing member and a second pushing member. The installation frame is arranged on the side wall of the first support member, and the installation frame is used to communicate with the limiting cavity. The rotating member is rotatably arranged on the side wall of the installation frame in a horizontal direction and is threadedly connected to the side wall of the installation frame. The second pushing member is connected to a bearing preset on the first end of the rotating member located in the limiting cavity. The first pushing member is connected to the bottom of the piston member. The rotating member is used to drive the second pushing member to move in the horizontal direction during the process of screwing in and out, so that the second pushing member drives the first pushing member and the piston member to rise and fall.

[0021] In some embodiments of the present application, the first pushing member includes a pushing block and a connecting rod, the connecting rod is arranged on the top of the pushing block, the top end of the connecting rod is connected to the bottom of the piston member, and the bottom surface of the pushing block is an inclined structure; the second pushing member is a frustum structure, and the second pushing member is used to abut the bottom surface of the pushing block through the side wall of the inclined structure.

[0022] In some embodiments of the present application, a side cover is provided on the side of the mounting frame away from the first support member, the side cover is connected to the mounting frame by bolts, the rotating member is passed through the side cover and is connected to the side cover by threads, and a hand wheel is provided at the second end of the rotating member.

[0023] In some embodiments of the present application, a top cover is disposed on the top of the first support member, a compression spring is disposed in the oil storage cavity, and the compression spring is compressed between the top cover and the piston member.

[0024] In some embodiments of the present application, the limiting member includes a telescopic side plate and a limiting side plate. The outer wall of the limiting side plate is used to abut the inner hole supporting the axial flow casing. A plurality of telescopic side plates are provided. The plurality of telescopic side plates are used to be circumferentially arranged along the inner wall of the limiting side plate and to be enclosed with the limiting side plate to form a pressure regulating chamber. Each telescopic side plate is also used to be connected to the tail end of the second support member.

[0025] In some embodiments of the present application, the limit member also includes a connecting side plate, which is arranged on the end surface of the telescopic side plate close to the second support member, and a boss-shaped mounting platform is arranged at the tail end of the second support member. The connecting side plate is used to fit the mounting platform and the two are connected and fastened by bolts.

[0026] In some embodiments of the present application, the telescopic side panels are made of elastic material.

[0027] According to another aspect of the present application, a method for machining coating holes and flow channels of an axial flow casing is provided, which uses the above-mentioned axial flow casing coating hole and flow channel machining device and comprises the following steps:

[0028] S100, when machining the coating hole, stop when the large drill tip reaches the coating position of the axial flow casing;

[0029] S200, use a small drill tip to drill through the coating to form a small hole;

[0030] S300, using a milling cutter to expand the bottom of the small perforation of the coating in S200 by spiral milling;

[0031] S400, use a boring tool with a small feed method to process the hole diameter of the small hole with expanded thickness in place;

[0032] S500, when processing the casing flow channel, first combine the two halves of the sprayed axial flow casing;

[0033] S600, the lathe process is used to rough-process the flow channel after spraying, and a 0.25mm margin is reserved on one side. During processing, the flow channel surface is turned in three layers to gradually release the stress;

[0034] S700, the combined axial flow casing is decomposed into two halves, and the casing end face reference is repaired;

[0035] S800, assemble the two halves of the casing, and support the large end of the axial flow casing to fine-machine the flow channel area.

[0036] In some embodiments of the present application, in step S300, the hole is expanded by removing the excess by a force parallel to the inclined surface of the coating; in step S600, the rough machining is divided into three layers for turning, and the part is realigned after each layer of turning, the first layer removes about 0.5-0.6mm of excess, the second layer removes 0.8-1mm of excess, and the third layer removes 0.1-0.2mm of excess, and the reserved excess after three cuttings is 0.25mm on a single side.

[0037] This application has the following beneficial effects:

[0038] The present application provides an axial flow casing coating hole and flow channel processing device that supports a second support member through a first support member, and the second support member is arranged in an annular array on the top of the first support member. The tail end of the second support member is connected to a limiting member, and a pressure regulating chamber in the limiting member is connected to an oil storage chamber through an oil hole. The internal pressure of the oil storage chamber can be changed by pushing the piston member up and down, and then the piston member is pushed up by a pushing component to increase the pressure in the pressure regulating chamber, so that the limiting member expands and presses the inner hole of the axial flow casing to strengthen the limiting support, and can adapt to the top tightening support of inner holes of different sizes; and the piston member is driven down by the pushing component to reduce the pressure in the pressure regulating chamber, so that the limiting member loosens its support for the axial flow casing, so that the operation of supporting and limiting the inner holes of axial flow casings of different sizes can be very conveniently realized through a set of clamping devices.

[0039] The axial flow casing coating hole and flow channel processing method of the present application also has the above-mentioned beneficial effects, and also includes optimizing and improving the coating hole and flow channel processing method according to the difficulties in processing coating holes and flow channels of axial flow casing parts of aircraft engines, effectively avoiding coating cracking and bulging phenomena, ensuring qualified flow channel size processing, and improving the quality of part delivery.

[0040] 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

[0041] 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:

[0042] Figure 1 It is a schematic diagram of a peephole at the coating of an axial flow casing of the present application;

[0043] Figure 2 It is a schematic diagram of deformation generated during the existing coating processing;

[0044] Figure 3It is a structural schematic diagram of an axial flow casing of a preferred embodiment of the present application;

[0045] Figure 4 Schematic diagram of the flow channel coating on the axial flow casing of the preferred embodiment of the present application;

[0046] Figure 5 is a schematic diagram of the installation of the first support member and the second support member in a preferred embodiment of the present application;

[0047] Figure 6 It is a structural schematic diagram of a preferred embodiment of the present application;

[0048] Figure 7 It is a schematic diagram of the internal structure of the first support member and the second support member of the preferred embodiment of the present application;

[0049] Figure 8 It is a structural schematic diagram of a pushing assembly of a preferred embodiment of the present application;

[0050] Fig. 9 It is a flow chart of the casing flow channel processing of the preferred embodiment of the present application;

[0051] Legend: 100, axial flow casing; 1, base; 2, first support member; 21, limit chamber; 22, oil storage chamber; 23, top cover; 3, second support member; 31, oil hole; 32, mounting platform; 4, limit member; 41, connecting side plate; 42, telescopic side plate; 43, limit side plate; 44, pressure regulating chamber; 5, mounting frame; 51, side cover; 6, rotating member; 61, hand wheel; 7, piston member; 8, compression spring; 9, first push member; 91, push block; 92, connecting rod; 10, second push member. DETAILED DESCRIPTION

[0052] 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.

[0053] Figure 1 It is a schematic diagram of a peephole at the coating of an axial flow casing of the present application; Figure 2 It is a schematic diagram of deformation generated during the existing coating processing; Figure 3 It is a structural schematic diagram of an axial flow casing of a preferred embodiment of the present application;

[0054] Figure 4 Schematic diagram of the flow channel coating on the axial flow casing of the preferred embodiment of the present application; Figure 5 It is a schematic diagram of the installation of the first support member and the second support member in the preferred embodiment of the present application; Figure 6 It is a structural schematic diagram of a preferred embodiment of the present application; Figure 7 It is a schematic diagram of the internal structure of the first support member and the second support member of the preferred embodiment of the present application; Figure 8 It is a structural schematic diagram of a pushing assembly of a preferred embodiment of the present application; Fig. 9 It is a flow chart of casing flow channel processing according to a preferred embodiment of the present application.

[0055] An axial flow casing coating hole and flow channel processing device includes a small drill bit, a large drill bit, a milling cutter and a boring cutter. The axial flow casing coating hole and flow channel processing device is used to clamp the axial flow casing 100 so as to process the coating hole and the flow channel. The axial flow casing coating hole and flow channel processing device includes a base 1, a first support member 2, a second support member 3, a stop member 4 and a pushing assembly:

[0056] The first support member 2 is arranged on the base 1, and a central through hole is opened in the first support member 2, and a piston member 7 is movably arranged in the central through hole. The central through hole is located above the piston member 7 to form an oil storage chamber 22, and the oil storage chamber 22 is used to store hydraulic oil;

[0057] The second support members 3 are arranged in an annular array on the top of the first support member 2, and the stopper 4 is arranged at the tail end of each second support member 3. The stopper 4 is used to abut against and press the inner hole of the axial flow casing 100 to support the axial flow casing 100. A pressure regulating cavity 44 is provided in the stopper 4, and an oil hole 31 is provided in the second support member 3. The oil hole 31 is used to connect the oil storage cavity 22 with the pressure regulating cavity 44;

[0058] The middle through hole is located below the piston member 7 as the limit cavity 21, and the pushing component is movably arranged in the limit cavity 21. The pushing component is used to push the piston member 7 to rise and fall, and when the piston member 7 rises, the hydraulic oil in the oil storage cavity 22 is compressed and pushed into the pressure regulating cavity 44 from the oil hole 31, thereby increasing the pressure of the pressure regulating cavity 44 to push the limit member 4 to expand and press the inner hole of the axial flow casing 100. Conversely, when the piston member 7 descends, the limit member 4 releases its pressing support on the inner hole of the axial flow casing 100.

[0059] Optionally, an oil outlet hole may be opened at the bottom of the pressure regulating chamber 44 and the oil outlet hole may be blocked by plugging, so as to facilitate the recycling of the hydraulic oil in the limiting member 4 .

[0060] The present application provides an axial flow casing coating hole and flow channel processing device, which supports the second support member 3 through the first support member 2. The second support member 3 is arranged in an annular array on the top of the first support member 2. The tail end of the second support member 3 is connected to the limiting member 4. The pressure regulating chamber 44 in the limiting member 4 is connected with the oil storage chamber 22 through the oil hole 31. The internal pressure of the oil storage chamber 22 can be changed by the lifting and lowering of the piston member 7, and then the piston member 7 is pushed up by the pushing component to increase the pressure of the pressure regulating chamber 44, so that the limiting member 4 expands and presses the inner hole of the axial flow casing 100 to strengthen the limiting support, and can adapt to the top tightening support of inner holes of different sizes; and by driving the piston member 7 to descend by the pushing component, the pressure of the pressure regulating chamber 44 can be reduced, so that the limiting member 4 loosens the support for the axial flow casing 100, so that the operation of supporting and limiting the inner holes of the axial flow casing 100 of different sizes can be very conveniently realized through a set of clamping devices.

[0061] Preferably, please refer to Figure 5 , 6 As shown in Figures 7 and 8, the pushing component includes a mounting frame 5, a rotating member 6, a first pushing member 9 and a second pushing member 10. The mounting frame 5 is arranged on the side wall of the first support member 2, and the mounting frame 5 is used to communicate with the limiting cavity 21. The rotating member 6 is rotatably arranged on the side wall of the mounting frame 5 along the horizontal direction and is connected to the side wall of the mounting frame 5 through a thread. The second pushing member 10 is connected to a bearing preset on the first end of the rotating member 6 located in the limiting cavity 21. The first pushing member 9 is connected to the bottom of the piston member 7. The rotating member 6 is used to drive the second pushing member 10 to move in the horizontal direction during the process of screwing in and out, so that the second pushing member 10 drives the first pushing member 9 and the piston member 7 to move up and down.

[0062] Specifically, the first pushing member 9 includes a pushing block 91 and a connecting rod 92, the connecting rod 92 is arranged on the top of the pushing block 91, the top end of the connecting rod 92 is connected to the bottom of the piston member 7, and the bottom surface of the pushing block 91 is an inclined structure; the second pushing member 10 is a frustum structure, and the second pushing member 10 is used to abut the bottom surface of the pushing block 91 through the side wall of the inclined structure.

[0063] It can be understood that the operator screws the rotating member 6 into the limit cavity 21, thereby driving the second push member 10 to translate, and the second push member 10 pushes the first push member 9 and the piston member 7 to move upward, thereby increasing the pressure in the oil storage cavity 22 and the pressure regulating cavity 44, and controlling the limit member 4 to expand and compress and support the inner hole of the axial flow casing 100; conversely, it is only necessary to screw out the rotating member 6 to loosen the support of the limit member 4 on the inner hole of the axial flow casing 100, and the adjustment operation is very convenient.

[0064] The bottom surface of the first pusher 9 is an inclined surface, which can fit with the side wall of the second pusher 10 of the upper structure. The second pusher 10 can accurately control the displacement of the first pusher 9 and the piston member 7, so that the limit member 4 can accurately and stably support the inner hole of the axial flow casing 100.

[0065] It should be noted that the rotating member 6 can be a screw rod, and the maintenance and replacement of the rotating member 6 is facilitated by using standard parts.

[0066] Preferably, please refer to Figure 7 As shown, a side cover 51 is provided on the side of the mounting frame 5 away from the first support member 2, and the side cover 51 is connected to the mounting frame 5 by bolts. The rotating member 6 is penetrated by the side cover 51 and is connected to the side cover 51 by threads, and a hand wheel 61 is provided at the second end of the rotating member 6.

[0067] It can be understood that the side cover 51 is a structure that can be easily disassembled, thereby facilitating the disassembly, assembly and maintenance of the rotating member 6 and the second pushing member 10. At the same time, after removing the side cover 51, the inside of the limiting cavity 21 can be easily cleaned, including leaked hydraulic oil and residues, etc., and the smooth movement of the piston member 7 is ensured to avoid jamming and the like.

[0068] Preferably, please refer to Figure 6 , 7 As shown in , 8 , a top cover 23 is provided on the top of the first support member 2 , a compression spring 8 is provided in the oil storage chamber 22 , and the compression spring 8 is compressed between the top cover 23 and the piston member 7 .

[0069] It can be understood that by removing the top cover 23, hydraulic oil can be easily added to the oil storage chamber 22, and the compression spring 8 provides an elastic force to push the piston member 7 away from the top cover 23, thereby realizing the lowering and resetting of the piston member 7, so that the piston member 7 can be pushed to perform repeated lifting and lowering movements through the pushing assembly, and can protect the pressure regulating chamber 44, preventing the piston member 7 from rising too much, causing overpressure in the pressure regulating chamber 44, and affecting the service life of the limit member 4.

[0070] Preferably, please refer to Figure 1 As shown, the limiting member 4 includes a telescopic side plate 42 and a limiting side plate 43. The outer wall of the limiting side plate 43 is used to abut the inner hole of the supporting axial flow casing 100. The telescopic side plates 42 are provided in plurality. The plurality of telescopic side plates 42 are used to be circumferentially arranged along the inner wall of the limiting side plate 43 and enclosed with the limiting side plate 43 to form a pressure regulating chamber 44. Each telescopic side plate 42 is also used to be connected to the tail end of the second support member 3.

[0071] Specifically, the limit member 4 also includes a connecting side plate 41, which is arranged on the end surface of the telescopic side plate 42 close to the second support member 3. A boss-shaped mounting platform 32 is provided at the tail end of the second support member 3. The connecting side plate 41 is used to fit the mounting platform 32 and connect and fasten the two by bolts.

[0072] It can be understood that the telescopic side panels 42 and the limiting side panels 43 on all sides enclose a pressure regulating chamber 44, and the changes in the pressure in the pressure regulating chamber 44 drive the telescopic side panels 42 and the limiting side panels 43 to deform, thereby achieving the overall expansion or contraction of the limiting member 4, so as to enable the limiting side panels 43 to support the inner holes of the axial flow casing 100 of different sizes.

[0073] The connecting side plate 41 is connected to the mounting platform 32 by bolts, which can facilitate the disassembly and assembly of the stopper 4, and can also achieve a good sealing surface at the mounting surface of the mounting platform 32 to ensure the pressure establishment and regulation of the pressure regulating chamber 44. Optionally, a rubber sealing pad is provided at the contact surface between the connecting side plate 41 and the mounting platform 32 to enhance the sealing effect.

[0074] Preferably, the telescopic side panels 42 are made of elastic material.

[0075] It is understandable that the telescopic side plate 42 is made of elastic material, which can ensure that the telescopic side plate 42 has a larger ductility, and achieve a larger expansion range of the limiter 4 as a whole, so as to adapt to the compression support requirements of the inner hole of the axial flow casing 100. At the same time, the telescopic side plate 42 made of elastic material can also have a certain buffer protection effect together with the limiter side plate 43, avoiding direct rigid contact between the limiter side plate 43 and the axial flow casing 100, which is easy to be damaged by collision.

[0076] Optionally, a rubber pad is provided on the outer wall of the limiting side plate 43. The rubber pad can play a further buffering and protective role, and can increase the friction between the rubber pad and the inner hole of the axial flow casing 100.

[0077] According to another aspect of the present application, a method for machining coating holes and flow channels of an axial flow casing is provided, which uses the above-mentioned axial flow casing coating hole and flow channel machining device and comprises the following steps:

[0078] S100, when machining the coating hole, use a large drill bit to drill to the coating position of the axial flow casing 100 and stop;

[0079] S200, use a small drill tip to drill through the coating to form a small hole;

[0080] S300, using a milling cutter to expand the bottom of the small perforation of the coating in S200 by spiral milling;

[0081] S400, use a boring tool with a small feed method to process the hole diameter of the small hole with expanded thickness in place;

[0082] S500, when processing the casing flow channel, firstly assemble the two halves of the sprayed axial flow casing 100;

[0083] S600, the lathe process is used to rough-process the flow channel after spraying, and a 0.25mm margin is reserved on one side. During processing, the flow channel surface is turned in three layers to gradually release the stress;

[0084] S700, the combined axial flow casing 100 is decomposed into two casing halves, and the casing end face reference is repaired;

[0085] S800, assemble the two halves of the casing, and support the large end of the axial flow casing 100 to fine-machine the flow channel area.

[0086] Preferably, in step S300, the hole is expanded by removing the excess by a force parallel to the inclined surface of the coating; in step S600, the rough machining is performed in three layers, and the part is realigned after each layer of turning, the first layer removes about 0.5-0.6mm of excess, the second layer removes 0.8-1mm of excess, and the third layer removes 0.1-0.2mm of excess, and the reserved excess after three cuttings is 0.25mm on a single side.

[0087] The axial flow casing coating hole and flow channel processing method of the present application also has the above-mentioned beneficial effects, and also includes optimizing and improving the coating hole and flow channel processing method according to the difficulties in processing coating holes and flow channels of axial flow casing parts of aircraft engines, effectively avoiding coating cracking and bulging phenomena, ensuring qualified flow channel size processing, and improving the quality of part delivery.

[0088] The present application discloses a casing coating hole and flow channel processing method, which is mainly implemented in the mechanical processing of a new type of aircraft engine axial flow casing:

[0089] The specific operation of casing coating hole processing is as follows (taking diameter Φ7mm and hole depth 9.5mm as an example):

[0090] 1. Use a center drill to machine a 1mm deep guide hole at the center of the hole, with the tool tip facing the tool, a linear speed of 17-19m / s, and a feed rate of 35-40mm / min;

[0091] 2. Use a Φ6.5mm drill bit to drill to the coating position (about 8.9mm deep), with the drill tip aligned with the tool, and the drilling depth is 2mm each time, the linear speed is 19-21m / s, and the feed rate is 30-35mm / min;

[0092] 3. Use a Φ2mm drill bit to drill from a depth of 6mm to a depth of 10mm, drilling through the coating part, with a linear speed of 14-16m / s and a feed rate of 30-35mm / min;

[0093] 4. Use a Φ4mm milling cutter to cut from the center of the circle in a spiral milling mode, from a depth of 4mm to a depth of 10mm, and expand the bottom diameter of the hole to Φ6.5mm. The linear speed is 17-19m / s, the feed rate is 30-35mm / min, and the spiral milling parameters are: spiral pitch 0.15-0.25mm, and the final depth feed rate is 15-20mm / min;

[0094] 5. Use a Φ7 single-edged boring tool to process the hole diameter to Φ7mm, the processing depth is 10mm, the line speed is 28-32m / s, and the feed rate is 30-35mm / min.

[0095] The coating holes processed according to the above steps have good finish, and there is no cracking or bulging of the coating. For coating holes of other apertures, the corresponding size of tools can be selected according to the above steps for processing.

[0096] The specific operations of casing flow channel processing are as follows:

[0097] 1. After spraying, grind off the excess coating on the mating surfaces of the two halves of the casing, use precision positioning bolts to install them on the bolt holes on the longitudinal mounting edges of the two halves of the casing, and assemble the two halves of the casing;

[0098] 2. Clamp the parts, align the four-point symmetric runout of the reference circle to no more than 0.02mm, turn the coating in three layers, re-align after turning each layer, remove the allowance of about 0.5-0.6mm for the first layer, 0.8-1mm for the second layer, and 0.1-0.2mm for the third layer. The remaining allowance after three cuttings is 0.25mm on one side. Cutting parameters: linear speed 70-80m / min, feed rate 0.08-0.1mm / min, cutting depth 0.5-0.6mm;

[0099] 3. Remove the bolts on the longitudinal mounting side and disassemble the assembled axial flow casing into two halves;

[0100] 4. Grind the end face reference of the two halves of the casing to facilitate the support of subsequent processes;

[0101] 5. Use precision positioning bolts to combine the two halves of the receiver;

[0102] 6. Clamp the parts, align the four symmetrical points of the reference circle (in the longitudinal direction of the fitting surface and the vertical direction of the fitting surface) with a runout of no more than 0.005mm, and turn them in two cuts. The first cut has a single-sided cutting amount of 0.15mm. After turning, check that the reference circle runout should be no more than 0.005mm, otherwise realign the parts and remove the remaining 0.1mm allowance with the second cut. Cutting parameters: linear speed 70-80m / min, feed rate 0.08-0.1mm / min, cutting depth 0.5-0.6mm.

[0103] The deformation of the flow channel processed by the above method is small, the process stability is greatly improved, and the pass rate of flow channel runout and contour degree is increased to 100%.

[0104] The coating hole processing method was optimized because the inventors found through research that the cause of coating cracking or bulging is excessive cutting force. Direct use of large-diameter drills and buried drills will remove a large amount of excess, resulting in large cutting forces, which can easily lead to local cracking of the coating. When the drill tip is processed from the base part of the part to the coating part, it will generate an extrusion force perpendicular to the inclined surface of the coating on the coating part, causing the coating to bulge outward from the middle. Since the drill bit is directly large, the coating area near the hole mouth will loosen or separate from the base body. When buried drills or boring tools are used for subsequent processing, the coating near the hole mouth is easily cracked due to the force.

[0105] Therefore, this application uses a small diameter drill bit (Φ2mm) to dry through the coating, reducing the cutting force and avoiding the coating being squeezed, cracked and bulged due to excessive cutting force. Then a Φ4mm milling cutter is used to expand the hole to Φ6.5mm using spiral milling. The force parallel to the inclined surface of the coating is used to remove the excess. The final 0.5mm excess is small, and the use of a single-edged boring tool can further reduce the cutting force and avoid the coating being squeezed, cracked and bulged.

[0106] In order to solve the deformation problems after spraying and subsequent turning, the flow channel deformation is small after the improved processing scheme is adopted. The deformation of the parts after assembly and splitting is about 0.008-0.02mm, which can meet the design requirements. The principle is: the internal stress between the coating and the substrate of the assembled axial flow casing just after spraying is large, and the two ends of the part fitting surface shrink inward severely. It needs to be turned in three layers during rough machining, and the parts need to be re-aligned after each layer of turning. Because the internal stress between the coating and the substrate is gradually released during turning, layered cutting can ensure the uniformity of coating removal and reduce the deformation of the parts after machining, thereby avoiding dimensional deviation. Decomposing parts after rough turning can further release the stress of the parts, and grinding and repairing the benchmark can reduce the clamping alignment and measurement errors during the fine machining of parts.

[0107] 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.

[0108] 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 coating hole and flow channel processing device, comprising a small drill bit, a large drill bit, a milling cutter and a boring cutter, the axial flow casing coating hole and flow channel processing device is used to clamp the axial flow casing (100) so as to process the coating hole and the flow channel, characterized in that: The axial flow casing coating hole and flow channel processing device comprises a base (1), a first support member (2), a second support member (3), a stop member (4) and a pushing assembly: The first support member (2) is arranged on the base (1), a middle through hole is provided in the first support member (2), a piston member (7) is movably arranged in the middle through hole, the middle through hole is located above the piston member (7) and is an oil storage chamber (22), and the oil storage chamber (22) is used to store hydraulic oil; The second support members (3) are arranged in an annular array on the top of the first support member (2), and the limiting members (4) are arranged at the rear end of each second support member (3). The limiting members (4) are used to abut against and press the inner hole of the axial flow casing (100) to support the axial flow casing (100). A pressure regulating chamber (44) is provided in the limiting members (4), and an oil through hole (31) is provided in the second support member (3). The oil through hole (31) is used to connect the oil storage chamber (22) with the pressure regulating chamber (44); The middle through hole is located below the piston member (7) to form a limit cavity (21). The pushing component is movably arranged in the limit cavity (21). The pushing component is used to push the piston member (7) to move up and down, and when the piston member (7) rises, the hydraulic oil in the oil storage cavity (22) is compressed and pushed into the pressure regulating cavity (44) from the oil hole (31), thereby increasing the pressure of the pressure regulating cavity (44) to push the limit member (4) to expand and press the inner hole of the axial flow casing (100). Conversely, when the piston member (7) descends, the limit member (4) releases the pressing support on the inner hole of the axial flow casing (100).

2. The axial flow casing coating hole and flow channel processing device according to claim 1, characterized in that: The pushing component comprises a mounting frame (5), a rotating member (6), a first pushing member (9) and a second pushing member (10); the mounting frame (5) is arranged on the side wall of the first supporting member (2); the mounting frame (5) is used to communicate with the limiting cavity (21); the rotating member (6) is rotatably arranged on the side wall of the mounting frame (5) in a horizontal direction and is connected to the side wall of the mounting frame (5) by a thread; the second pushing member (10) is connected to a bearing preset on the first end of the rotating member (6) located in the limiting cavity (21); the first pushing member (9) is connected to the bottom of the piston member (7); the rotating member (6) is used to drive the second pushing member (10) to move in the horizontal direction during the process of screwing in and out, so that the second pushing member (10) drives the first pushing member (9) and the piston member (7) to move up and down.

3. The axial flow casing coating hole and flow channel processing device according to claim 2, characterized in that: The first pushing member (9) comprises a pushing block (91) and a connecting rod (92), wherein the connecting rod (92) is arranged at the top of the pushing block (91), the top end of the connecting rod (92) is connected to the bottom of the piston member (7), and the bottom surface of the pushing block (91) is an inclined structure; the second pushing member (10) is a frustum structure, and the second pushing member (10) is used to abut the bottom surface of the pushing block (91) through the side wall of the inclined structure.

4. The axial flow casing coating hole and flow channel processing device according to claim 2, characterized in that: A side cover (51) is provided on the side of the installation frame (5) away from the first support member (2); the side cover (51) is connected to the installation frame (5) by bolts; a rotating member (6) is passed through the side cover (51) and is connected to the side cover (51) by threads; a hand wheel (61) is provided at the second end of the rotating member (6).

5. The axial flow casing coating hole and flow channel processing device according to claim 1, characterized in that: A top cover (23) is arranged on the top of the first support member (2), a compression spring (8) is arranged in the oil storage chamber (22), and the compression spring (8) is compressed between the top cover (23) and the piston member (7).

6. The axial flow casing coating hole and flow channel processing device according to claim 1, characterized in that: The limiting member (4) comprises a telescopic side plate (42) and a limiting side plate (43); the outer wall of the limiting side plate (43) is used to abut against the inner hole of the supporting axial flow casing (100); a plurality of telescopic side plates (42) are provided; the plurality of telescopic side plates (42) are used to be arranged circumferentially along the inner wall of the limiting side plate (43) and to enclose the limiting side plate (43) to form a pressure regulating chamber (44); each telescopic side plate (42) is also used to be connected to the rear end of the second support member (3).

7. The axial flow casing coating hole and flow channel processing device according to claim 6, characterized in that: The limiting member (4) further comprises a connecting side plate (41), the connecting side plate (41) being arranged on the end surface of the telescopic side plate (42) close to the second supporting member (3), a boss-shaped mounting platform (32) being arranged at the rear end of the second supporting member (3), the connecting side plate (41) being used to fit the mounting platform (32) and to connect and fasten the two by bolts.

8. The axial flow casing coating hole and flow channel processing device and processing method according to claim 6, characterized in that: The telescopic side panels (42) are made of elastic material.

9. A method for processing coating holes and flow channels of an axial flow casing, characterized in that: Using the axial flow casing coating hole and flow channel processing device as described in any one of claims 1 to 8, the axial flow casing coating hole and flow channel processing method comprises the following steps: S100, when machining the coating hole, use a large drill bit to drill to the coating position of the axial flow casing (100) and stop; S200, use a small drill bit to drill through the coating to form a small hole; S300, using a milling cutter to expand the bottom of the small perforation of the coating in S200 by spiral milling; S400, use a boring tool with a small feed method to process the hole diameter of the small hole with expanded thickness in place; S500, when processing the casing flow channel, firstly assemble the two halves of the sprayed axial flow casing (100); S600, the lathe process is used to rough-process the flow channel after spraying, and a 0.25mm margin is reserved on one side. During processing, the flow channel surface is turned in three layers to gradually release the stress; S700, the combined axial flow casing (100) is decomposed into two casing halves, and the casing end face reference is repaired; S800, the two casing halves are combined, and the flow channel area is finely processed in place by supporting the large end of the axial flow casing (100).

10. The axial flow casing coating hole and flow channel processing device and processing method according to claim 9, characterized in that: In step S300, the hole is expanded by removing the excess by a force parallel to the inclined surface of the coating; in step S600, the rough machining is divided into three layers for turning, and the part is realigned after each layer of turning. The first layer removes about 0.5-0.6mm of excess, the second layer removes 0.8-1mm of excess, and the third layer removes 0.1-0.2mm of excess. After three cuttings, the reserved excess is 0.25mm on one side.

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