Axial flow casing coating hole and flow channel processing device and processing method

Abstract

The application discloses an axial flow casing coating hole and flow channel processing device and a processing method, and belongs to the technical field of aircraft engine manufacturing. The 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. The middle through hole is located above a piston piece and serves as an oil storage cavity. A limiting piece is used for abutting and compressing the inner hole of the axial flow casing to support the axial flow casing. A pressure regulating cavity is formed in the limiting piece. The middle through hole is located below the piston piece and serves as a limiting cavity. A pushing assembly is used for pushing the piston piece to ascend and descend, and hydraulic oil in the oil storage cavity is pushed into the pressure regulating cavity when the piston piece ascends, so that the pressure of the pressure regulating cavity is increased to push the limiting piece to expand and compress the inner hole of the axial flow casing. Conversely, when the piston piece descends, the limiting piece is loosened to release the compression support on the inner hole of the axial flow casing. In addition, the coating hole processed by the optimized processing method has good smoothness, and the coating has no cracking and bulging phenomenon. Meanwhile, the flow channel processed has small deformation, and the process stability is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine manufacturing, in particular to an axial flow casing coating hole and flow passage processing device. Furthermore, the present application also relates to a processing method comprising the above axial flow casing coating hole and flow passage processing device. BACKGROUND

[0002] The information provided in this section is for the purpose of generally presenting the context of the present 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 axial flow casing of an aero-engine is a thin-walled part with a wall thickness of about 2-3mm, poor rigidity, and easy deformation, which is an important component of a turboshaft engine. Its working principle is to provide compressed air for the combustion chamber through the combined action of the guide vane and the static vane ring assembled on the axial flow casing and the rotor part.

[0004] In order to facilitate the assembly of the guide vane and the static vane ring, the axial flow casing is generally designed as a half structure, that is, composed of left and right half casings. In order to adapt to the change of the airflow and volume entering the casing and avoid airflow separation and reduce energy loss, the inner wall of the casing is designed as a smooth streamline passage. At the assembly position of the rotor blade, in order to avoid the scratching of the rotor blade and the part base caused by thermal expansion and contraction of the engine during use, which leads to blade fracture, about 0.5-0.7mm of the base on one side is turned off at the flow passage of the rotor blade assembly, and the flow passage part is processed in place after spraying a low-hardness aluminum-silicon (AlSi) material. In addition, in order to facilitate the observation of the internal part condition of the axial flow casing, a peep hole is processed in the sprayed layer area of some models of axial flow casings.

[0005] The existing peep hole at the coating position of the axial flow casing is shown in the accompanying drawings of the specification. Figure 1 Taking a certain type of axial flow casing with a material of stainless steel (ZG06Cr16Ni5Mo) as an example, the peep hole diameter is Φ7, the depth is about 9.5mm, the coating thickness is about 0.6mm, and the processing method is as follows:

[0006] 1. A center drill is used to process a guide hole in the center of the hole, about 1mm deep;

[0007] 2. A drill bit with a diameter of about Φ6.5mm is used to drill the hole in a pecking manner;

[0008] 3. A buried drill or a boring cutter is used to process the hole diameter to the final size.

[0009] The hole processed by the method can cause partial coating collapse or bulging at the coating outlet, which cannot meet the design requirements.

[0010] At the same time, the size of the flow channel part of the existing type of axial flow casing requires high precision, generally: round runout | 0.05 | A | B, profile tolerance | 0.1 | A | B, and spraying treatment is required during processing, the total coating thickness after spraying is greater than or equal to 2mm, a large amount of internal stress is generated on the casing body during the spraying process, causing the deformation of the two half casings, and the larger the size of the casing, the thinner the wall thickness, the greater the deformation. After removing the excess amount of coating, the part needs to be placed for a period of time after splitting, and in this process, the internal stress between the coating and the substrate will be released, thereby causing the deformation of the part to be out of tolerance, the deformation during coating processing is shown in the accompanying drawings. Figure 2

[0011] If the conventional process method is used for spraying processing, the flow channel area after spraying is directly processed in one process, and the part will be deformed due to insufficient stress release, thereby causing the size to be out of tolerance, which affects the performance of the engine. In addition, due to the different sizes of the casing, different sets of clamping tools are often needed to clamp the casing before processing, which is not conducive to reducing the overall manufacturing 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 above-mentioned axial flow casing parts of the aero-engine have become a major quality problem that needs to be solved urgently.

[0013] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those skilled in the art. SUMMARY

[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 stably clamp and support different sizes of axial flow casings by limiting pieces, and the support outer diameter of the limiting pieces can be conveniently adjusted to adapt to the clamping and limiting support of the inner hole 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 hole processed by the optimized processing method has good smoothness, and the coating has no collapse and bulging phenomenon, and the flow channel processed has small deformation, and the process stability is greatly improved.

[0016] ​According to an aspect of the present application, a device for processing coating holes and flow channels of an axial flow casing is provided, which comprises a small drill, a large drill, a milling cutter and a boring cutter. The device is used for clamping the axial flow casing to process the coating holes and flow channels. The device comprises a base, a first support, a second support, a limiting member and a pushing assembly.

[0017] The first support is arranged on the base. A middle through hole is formed in the first support. A piston member is movably arranged in the middle through hole. An oil storage cavity is arranged above the piston member. The oil storage cavity is used for storing hydraulic oil.

[0018] The second supports are arranged in an annular array on the top of the first support. Limiting members are arranged at the tail ends of the second supports. The limiting members are used for abutting and pressing the inner hole of the axial flow casing to support the axial flow casing. A pressure regulating cavity is formed in the limiting member. An oil passing hole is formed in the second support. The oil passing hole is used for connecting the oil storage cavity and the pressure regulating cavity.

[0019] The middle through hole below the piston member is a limiting cavity. The pushing assembly is movably arranged in the limiting cavity. The pushing assembly is used for pushing the piston member to ascend and descend. When the piston member ascends, the hydraulic oil in the oil storage cavity is compressed and pushed into the pressure regulating cavity through the oil passing hole. Thus, the pressure of the pressure regulating cavity is increased to push the limiting member to expand and press the inner hole of the axial flow casing. Conversely, when the piston member descends, the limiting member is released to support the inner hole of the axial flow casing.

[0020] In some embodiments of the present application, the pushing assembly comprises a mounting frame, a rotating member, a first pushing member and a second pushing member. The mounting frame is arranged on the side wall of the first support. The mounting frame is used for communicating with the limiting cavity. The rotating member is rotatably arranged on the side wall of the mounting frame and is connected with the side wall of the mounting frame through threads. The second pushing member is connected with the first end of the rotating member in the limiting cavity through a pre-set bearing. The first pushing member is connected with the bottom of the piston member. The rotating member is used for moving the second pushing member in the horizontal direction in the process of screwing in and out, so that the second pushing member drives the first pushing member and the piston member to ascend and descend.

[0021] In some embodiments of the present application, the first pushing member comprises 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 with the bottom of the piston member. The bottom surface of the pushing block is a slope structure. The second pushing member is a conical structure. The second pushing member is used for abutting the bottom surface of the pushing block through the side wall of the slope structure.

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

[0023] In some embodiments of the present application, the top of the first support is provided with a top cover, and a compression spring is arranged in the oil storage cavity and presses between the top cover and the piston.

[0024] In some embodiments of the present application, the limiting member comprises a telescopic side plate and a limiting side plate, the outer wall of the limiting side plate is used for abutting against the inner hole of the support shaft casing, the telescopic side plate is provided with a plurality of telescopic side plates, the plurality of telescopic side plates are used for being arranged along the inner wall of the limiting side plate and surrounding the limiting side plate to form a pressure regulating cavity, and each telescopic side plate is further used for being connected with the tail end of the second support.

[0025] In some embodiments of the present application, the limiting member further comprises a connecting side plate, the connecting side plate is arranged on the end face of the telescopic side plate close to the second support, the tail end of the second support is provided with a boss-shaped mounting platform, and the connecting side plate is used for being attached to the mounting platform and being connected and fastened by bolts.

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

[0027] According to another aspect of the present application, a shaft casing coating hole and flow channel processing method is also provided, which uses the shaft casing coating hole and flow channel processing device, and comprises the following steps:

[0028] S100, when the coating hole is processed, the large drill bit is used to process to the coating position of the shaft casing and then stopped;

[0029] S200, a small drill bit is used to drill the coating to form a small hole;

[0030] S300, the bottom of the small hole of the coating in S200 is reamed by using a milling cutter in a spiral milling manner;

[0031] S400, the hole diameter of the reamed small hole is processed in place by using a boring cutter in a small feeding manner;

[0032] S500, when the casing flow channel is processed, the two halves of the sprayed shaft casing are combined first;

[0033] S600, a single-sided allowance of 0.25 mm is reserved in a rough machining process of the sprayed flow channel, and the flow channel surface is turned in three layers during machining, and the stress is gradually released;

[0034] S700, the combined shaft casing is disassembled into two half casings, and the casing end face reference is processed;

[0035] S800, the two half casings are combined, the flow channel area is precisely machined in place by relying on the large end of the shaft casing.

[0036] In some embodiments of the present application, the step S300 adopts the force parallel to the coating slope to remove the excess amount; in the step S600, the rough machining is performed in three layers, and the part is re-aligned after each layer of turning, the first layer removes the excess amount of about 0.5-0.6mm, the second layer removes the excess amount of 0.8-1mm, and the third layer removes the excess amount of 0.1-0.2mm, and the reserved excess amount after three times of cutting is 0.25mm on a single side.

[0037] The present application has the following beneficial effects:

[0038] The shaft flow casing coating hole and flow passage processing device of the present application supports the second support through the first support, the second support is arranged in an annular array on the top of the first support, the tail end of the second support is connected to a limiting piece, the pressure regulating cavity in the limiting piece is in communication with the oil storage cavity through the oil hole, the internal pressure of the oil storage cavity can be changed by the lifting of the piston piece, and then the piston piece is pushed up by the pushing assembly to increase the pressure of the pressure regulating cavity, so that the limiting piece expands to press and support the inner hole of the shaft flow casing, and can adapt to the jacking support of inner holes of different sizes; and by driving the piston piece to descend through the pushing assembly, the pressure of the pressure regulating cavity can be adjusted, so that the limiting piece loosens the support of the shaft flow casing, so that the inner hole of the shaft flow casing of different sizes can be conveniently supported and positioned by a set of clamping device.

[0039] The shaft flow casing coating hole and flow passage processing method of the present application also has the above beneficial effects, and also includes optimizing and improving the processing method of the coating hole and the flow passage according to the processing difficulties of the coating hole and the flow passage of the aviation engine shaft flow casing part, effectively avoiding the coating cracking and bulging phenomenon, ensuring the processing qualification of the flow passage size, and improving the part delivery quality.

[0040] Of course, implementing any product of the present application does not necessarily need to achieve 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

[0041] 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 improper limitation on the present application. In the drawings:

[0042] Figure 1 is a schematic view of a peephole at the coating of the shaft flow casing of the present application;

[0043] Figure 2 is a schematic view of deformation generated in the existing coating processing process;

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

[0045] Figure 4 is a schematic diagram of the upper flow passage coating of 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 and the second support of the preferred embodiment of the present application;

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

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

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

[0050] Figure 9 is a flow chart of the casing flow passage processing of the preferred embodiment of the present application;

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

[0052] 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.

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

[0054] Figure 4 is a schematic diagram of the upper flow passage coating of the axial flow casing of the preferred embodiment of the present application; Figure 5 is a schematic diagram of the installation of the first support and the second support of the preferred embodiment of the present application; Figure 6 is a structural schematic diagram of the preferred embodiment of the present application; Figure 7 is a schematic diagram of the internal structure of the first support and the second support of the preferred embodiment of the present application;Figure 8 is a structural schematic diagram of a pushing assembly of a preferred embodiment of the application; Figure 9 is a flow chart of processing of a flow channel of a machine case of a preferred embodiment of the application.

[0055] An axial flow machine case 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 machine case coating hole and flow channel processing device is used for clamping the axial flow machine case 100 for processing of coating holes and flow channels, the axial flow machine case coating hole and flow channel processing device comprises a base 1, a first support 2, a second support 3, a limiting piece 4 and a pushing assembly:

[0056] The first support 2 is arranged on the base 1, a middle through hole is arranged in the first support 2, a piston piece 7 is movably arranged in the middle through hole, and an oil storage cavity 22 is arranged above the piston piece 7, the oil storage cavity 22 is used for storing hydraulic oil;

[0057] The second supports 3 are arranged in an annular array on the top of the first support 2, the limiting pieces 4 are arranged at the tail ends of the second supports 3, the limiting pieces 4 are used for abutting and pressing against the inner hole of the axial flow machine case 100 to support the axial flow machine case 100, a pressure regulating cavity 44 is arranged in the limiting piece 4, and an oil passing hole 31 is arranged in the second support 3, the oil passing hole 31 is used for connecting the oil storage cavity 22 and the pressure regulating cavity 44;

[0058] The middle through hole below the piston piece 7 is a limiting cavity 21, the pushing assembly is movably arranged in the limiting cavity 21, the pushing assembly is used for pushing the piston piece 7 to ascend and descend, and when the piston piece 7 ascends, the hydraulic oil in the oil storage cavity 22 is compressed and pushed into the pressure regulating cavity 44 through the oil passing hole 31, so as to increase the pressure of the pressure regulating cavity 44 to push the limiting piece 4 to expand and press the inner hole of the axial flow machine case 100, and vice versa, when the piston piece 7 descends, the limiting piece 4 is loosened to press and support the inner hole of the axial flow machine case 100.

[0059] Optionally, an oil outlet hole can be arranged at the bottom of the pressure regulating cavity 44 and plugged by a plug, so as to facilitate recycling of the hydraulic oil in the limiting piece 4.

[0060] The application discloses a processing device for holes and flow channels of an axial flow casing coating, which supports a second support member 3 through a 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 with a limiting member 4, a pressure regulating cavity 44 in the limiting member 4 is communicated with an oil storage cavity 22 through an oil passing hole 31, the internal pressure of the oil storage cavity 22 can be changed through the lifting and pushing of a piston member 7, then the piston member 7 is pushed upwards by a pushing assembly, the pressure of the pressure regulating cavity 44 is increased, the limiting member 4 is expanded to press and support the inner hole of the axial flow casing 100, and the supporting and pressing of the inner hole of different sizes can be adapted; when the piston member 7 is lowered by the pushing assembly, the pressure of the pressure regulating cavity 44 is reduced, the supporting of the limiting member 4 to the inner hole of the axial flow casing 100 is released, and thus the supporting and limiting operation of the inner hole of the axial flow casing 100 of different sizes can be realized through a set of clamping devices.

[0061] Preferably, referring to Figure 5 、 6 , 7, the pushing assembly 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 support member 2, the mounting frame 5 is used for being communicated with the limiting cavity 21, the rotating member 6 is rotatably arranged on the side wall of the mounting frame 5 and is connected with the side wall of the mounting frame 5 through threads, the second pushing member 10 is connected with the first end of the rotating member 6 in the limiting cavity 21 through a preset bearing, the first pushing member 9 is connected with the bottom of the piston member 7, and the rotating member 6 is used for driving the second pushing member 10 to move along the horizontal direction in the process of being screwed in and out, so that the second pushing member 10 drives the first pushing member 9 and the piston member 7 to lift and drop.

[0062] Specifically, the first pushing member 9 comprises 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 with the bottom of the piston member 7, and the bottom surface of the pushing block 91 is of an inclined surface structure; the second pushing member 10 is of a conical frustum structure, and the second pushing member 10 is used for abutting against the bottom surface of the pushing block 91 through the side wall of the inclined structure.

[0063] It can be understood that the rotating member 6 is screwed into the limiting cavity 21 by an operator, the second pushing member 10 is driven to translate, the first pushing member 9 and the piston member 7 are lifted and moved upwards by the second pushing member 10, the pressure in the oil storage cavity 22 and the pressure regulating cavity 44 is increased, the limiting member 4 is controlled to expand to press and support the inner hole of the axial flow casing 100, and vice versa, the support of the limiting member 4 to the inner hole of the axial flow casing 100 is released by unscrewing the rotating member 6, and the adjusting operation is very convenient.

[0064] The bottom surface of the first pushing member 9 is inclined, which can be attached to the sidewall of the second pushing member 10 of the second supporting structure. The displacement of the first pushing member 9 and the piston member 7 can be accurately controlled through the second pushing member 10, so that the accurate and stable support of the limiting member 4 to the inner hole of the axial flow casing 100 is realized.

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

[0066] Preferably, as shown in Figure 7 The side surface of the mounting frame 5 away from the first supporting member 2 is provided with a side cover 51, the side cover 51 is connected with the mounting frame 5 through bolts, the rotating member 6 is arranged on the side cover 51 and is connected with the side cover 51 through threads, and the second end of the rotating member 6 is provided with a hand wheel 61.

[0067] It can be understood that the structure can be conveniently disassembled through the side cover 51, so that the disassembly, assembly and maintenance of the rotating member 6 and the second pushing member 10 are facilitated. After the side cover 51 is removed, the inside of the limiting cavity 21 can be conveniently cleaned, including leaked hydraulic oil and residues, etc., and the smoothness of the movement of the piston member 7 is ensured, so that the phenomenon of jamming is avoided.

[0068] Preferably, as shown in Figure 6 、 7 , 8, the top of the first supporting member 2 is provided with a top cover 23, and the oil storage cavity 22 is provided with a compression spring 8, which is elastically pressed between the top cover 23 and the piston member 7.

[0069] It can be understood that the hydraulic oil can be conveniently added into the oil storage cavity 22 by disassembling the top cover 23, and the compression spring 8 provides an elastic force to push the piston member 7 away from the top cover 23, so that the piston member 7 is reset to descend, so that the piston member 7 is repeatedly lifted and lowered by the pushing assembly, and the pressure regulating cavity 44 is protected, so that the piston member 7 is prevented from rising too much to cause the pressure regulating cavity 44 to be over-pressured, and the service life of the limiting member 4 is affected.

[0070] Preferably, as shown in Figure 1 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 for abutting and supporting the inner hole of the axial flow casing 100, and the telescopic side plate 42 is provided with a plurality of telescopic side plates 42, which are used for being circumferentially arranged along the inner wall of the limiting side plate 43 and being enclosed with the limiting side plate 43 to form a pressure regulating cavity 44, and each telescopic side plate 42 is used for being connected with the tail end of the second supporting member 3.

[0071] Specifically, the limiting member 4 further comprises a connecting side plate 41, which is arranged on the end face of the telescopic side plate 42 close to the second support 3, and the tail end of the second support 3 is provided with a boss-shaped mounting platform 32, and the connecting side plate 41 is used to fit the mounting platform 32 and connect and fasten the two through bolts.

[0072] It can be understood that the telescopic side plates 42 around the circumference and the limiting side plates 43 together form a pressure regulating cavity 44, and the deformation of the telescopic side plates 42 and the limiting side plates 43 is driven by the change of the pressure in the pressure regulating cavity 44, so as to realize the expansion or contraction of the limiting member 4 as a whole, so as to realize the support of the limiting side plates 43 to the inner hole of the axial flow casing 100 of different sizes.

[0073] The connecting side plate 41 is connected with the mounting platform 32 through bolts, which can facilitate the disassembly and assembly of the limiting member 4, and at the same time, a better sealing surface can be realized at the mounting surface of the mounting platform 32, so as to ensure the establishment and adjustment of the pressure in the pressure regulating cavity 44. Optionally, a rubber sealing gasket is arranged at the contact surface of the connecting side plate 41 and the mounting platform 32 to enhance the sealing effect.

[0074] Preferably, the telescopic side plate 42 is made of elastic material.

[0075] It can be understood that the telescopic side plate 42 made of elastic material can ensure that the telescopic side plate 42 has greater ductility, so as to realize greater expansion range of the limiting member 4 as a whole, so as to adapt to the pressing support requirements of the inner holes of axial flow casings 100 of different sizes. At the same time, the telescopic side plate 42 made of elastic material can also have a certain buffering protection effect together with the limiting side plate 43, so as to avoid the direct rigid contact between the limiting side plate 43 and the axial flow casing 100, which is easy to be damaged by knocking.

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

[0077] According to another aspect of the present application, a processing method of an axial flow casing coating hole and flow channel is also provided, which uses the processing device of the axial flow casing coating hole and flow channel, and comprises the following steps:

[0078] S100, when processing the coating hole, stop using a large drill bit to process to the coating position of the axial flow casing 100;

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

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

[0081] S400, use a boring cutter to process the hole diameter of the expanded hole to the required size by small feeding.

[0082] S500, when machining the flow channel of the machine case, first combine the two halves of the sprayed axial flow machine case 100;

[0083] S600, the rough machining of the sprayed flow channel is performed in the number of turning processes, with a single side allowance of 0.25mm, and the flow channel surface is turned in three layers during machining to gradually release stress;

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

[0085] S800, the two halves of the machine case are combined, and the flow channel area of the large end of the axial flow machine case 100 is precisely machined in place.

[0086] Preferably, the reaming in step S300 is performed by removing the allowance with a force parallel to the coating slope; in step S600, the turning is performed in three layers during rough machining, and the part is re-aligned after each layer of turning, the first layer removes an allowance of about 0.5-0.6mm, the second layer removes an allowance of 0.8-1mm, and the third layer removes an allowance of 0.1-0.2mm, and the allowance reserved after three times of cutting is 0.25mm on a single side.

[0087] The axial flow machine case coating hole and flow channel machining method also has the above beneficial effects, and further includes optimizing and improving the machining method of the coating hole and the flow channel according to the coating hole and flow channel machining difficulties of the axial flow machine case part of the aircraft engine, effectively avoiding the coating cracking and bulging phenomenon, ensuring the flow channel size machining qualified, and improving the part delivery quality.

[0088] The machine case coating hole and flow channel machining method is mainly implemented in the machining of a new type of aircraft engine axial flow machine case:

[0089] The machine case coating hole machining tool is operated as follows (taking a diameter of Φ7mm and a hole depth of 9.5mm as an example):

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

[0091] 2. A Φ6.5mm drill bit is used to process to the coating position (about 8.9mm deep) in a peck drilling manner, the drill tip is aligned, the peck drilling is processed to a depth of 2mm each time, the linear speed is 19-21m / s, and the feed rate is 30-35mm / min;

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

[0093] 4. Use Φ4mm milling cutter to process from the center of the hole, the depth is from 4mm to 10mm, the bottom diameter is expanded to Φ6.5mm, the linear velocity is 17-19m / s, the feed rate is 30-35mm / min, the spiral milling parameters are: spiral spacing 0.15-0.25mm, the final depth feed rate 15-20mm / min;

[0094] 5. Use Φ7 single blade boring cutter to process the hole diameter to Φ7mm, the processing depth is 10mm, the linear velocity is 28-32m / s, the feed rate is 30-35mm / min.

[0095] The coating hole processed according to the above steps has good smoothness, and the coating has no cracking and bulging phenomenon. For the coating holes of other diameters, corresponding size tools can be selected according to the above steps to process.

[0096] The tool body is added to the machine case flow channel as follows:

[0097] 1. After spraying, the excess coating on the joint surface of the two half machine cases is polished, the precision positioning bolts are installed on the bolt holes on the longitudinal installation edge of the two half machine cases, and the two half machine cases are combined;

[0098] 2. The part is clamped and the reference circle is aligned, the four-point jump is not more than 0.02mm, the coating is divided into three layers for turning, the reference is aligned after each layer of turning, the first layer removes about 0.5-0.6mm, the second layer removes 0.8-1mm, and the third layer removes 0.1-0.2mm, the remaining amount after three times of cutting is 0.25mm on one side, the cutting parameters are: linear velocity 70-80m / min, feed amount 0.08-0.1mm / min, and cutting depth 0.5-0.6mm;

[0099] 3. Remove the bolts on the longitudinal installation edge, and separate the combined axial flow machine case into two half machine cases;

[0100] 4. Grind the end face reference of the two half machine cases to facilitate the support of the subsequent process;

[0101] 5. Combine the two half machine cases with precision positioning bolts;

[0102] 6. The part is clamped and the reference circle is aligned, the four-point jump (longitudinal joint surface direction and vertical joint surface direction) is not more than 0.005mm, and the part is divided into two knives for turning, the first knife removes 0.15mm on one side, the reference circle jump after turning should be not more than 0.005mm, otherwise the part is re-aligned, the second knife removes the remaining 0.1mm, the cutting parameters are: linear velocity 70-80m / min, feed amount 0.08-0.1mm / min, and cutting depth 0.5-0.6mm.

[0103] The flow channel processed by the method has small deformation, and the process stability is greatly improved, and the flow channel runout and profile tolerance rate is improved to 100%.

[0104] The optimization of the coating hole processing method is because the inventors have found that the reason for coating cracking or bulging is that the cutting force is too large, the remaining amount removed by directly using a large diameter drill and a drill bit is larger, the cutting force is larger, and the coating is easily cracked locally, and when the drill tip is processed from the part base to the coating part, it will generate a pushing force perpendicular to the coating bevel, causing the coating to bulge outward from the middle. Since the drill is directly larger, the coating area near the hole and the base will be loose or separated, and during subsequent processing with a drill or a boring tool, the coating near the hole is easily cracked under stress.

[0105] Therefore, the present application uses a small diameter drill (Φ2mm) to pass through the coating, reduces the cutting force, avoids the coating from being extruded and cracked due to excessive cutting force, and then expands the hole to Φ6.5mm using a Φ4mm milling cutter in a spiral milling manner. The remaining amount is removed using a force parallel to the coating bevel, and finally the remaining amount of 0.5mm is small, and the single-edge boring tool can further reduce the cutting force to avoid the coating from being extruded and cracked.

[0106] As for the deformation after spraying and the subsequent turning deformation, the flow channel processed by the improved processing scheme has small deformation, and the deformation of the part after being combined and split is about 0.008-0.02mm, which can meet the design requirements. The principle is that after the combined axial flow case is sprayed, the internal stress between the coating and the base is large, and the two ends of the part fitting surface contract inward seriously. During rough machining, the part is turned in three layers, and the part is repositioned after each layer is turned. Since the internal stress between the coating and the base is gradually released during turning, layered cutting can ensure the uniformity of the coating removal amount and reduce the deformation of the processed part, thereby avoiding size out-of-tolerance. Splitting the part after rough turning can further release the stress of the part, and grinding the reference can reduce the clamping and positioning error and measurement error during part finishing.

[0107] It should be noted that in this text, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0108] The principles and implementations of the present application are described herein with specific examples. The above examples are only used to help understand the method and its core idea of the present application. The above description is only the preferred embodiments of the present application. It should be pointed out that due to the limited nature of the language expression, there are objectively infinite specific structures, and for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner. The improvements, refinements, changes or combinations, or the application of the inventive concept and technical solution to other fields without improvement, shall be regarded as the protection of the present application.

Claims

1. A kind of axial flow machine casing coating hole and flow channel processing device, including small drill, big drill, milling cutter and boring cutter, axial flow machine casing coating hole and flow channel processing device are used to the clamping of axial flow machine casing (100) to be carried out coating hole and flow channel processing, it is characterized in that, The axial flow casing coating hole and flow passage processing device comprises a base (1), a first support (2), a second support (3), a limiting piece (4) and a pushing assembly: The first support (2) is arranged on the base (1), a middle through hole is formed in the first support (2), a piston piece (7) is movably arranged in the middle through hole, an oil storage cavity (22) is formed above the piston piece (7), and the oil storage cavity (22) is used for storing hydraulic oil; The second supports (3) are arranged in an annular array on the top of the first support (2), the limiting pieces (4) are arranged at the tail ends of the second supports (3), the limiting pieces (4) are used for abutting and pressing the inner hole of the axial flow casing (100) to support the axial flow casing (100), a pressure regulating cavity (44) is formed in the limiting piece (4), and an oil passing hole (31) is formed in the second support (3), the oil passing hole (31) is used for connecting the oil storage cavity (22) and the pressure regulating cavity (44); A limiting cavity (21) is formed below the piston piece (7), the pushing assembly is movably arranged in the limiting cavity (21), the pushing assembly is used for pushing the piston piece (7) to ascend and descend, and when the piston piece (7) ascends, the hydraulic oil in the oil storage cavity (22) is compressed and pushed into the pressure regulating cavity (44) through the oil passing hole (31), so that the pressure of the pressure regulating cavity (44) is increased to push the limiting piece (4) to expand and press the inner hole of the axial flow casing (100), and conversely, when the piston piece (7) descends, the limiting piece (4) is loosened to press and support the inner hole of the axial flow casing (100).

2. The apparatus of claim 1, wherein: The pushing assembly comprises a mounting frame (5), a rotating piece (6), a first pushing piece (9) and a second pushing piece (10), the mounting frame (5) is arranged on the side wall of the first support (2), the mounting frame (5) is used for being connected with the limiting cavity (21), the rotating piece (6) is rotatably arranged on the side wall of the mounting frame (5) in the horizontal direction and is connected with the side wall of the mounting frame (5) through screw threads, the second pushing piece (10) is connected with the first end of the rotating piece (6) in the limiting cavity (21) through a preset bearing, the first pushing piece (9) is connected with the bottom of the piston piece (7), and the rotating piece (6) is used for driving the second pushing piece (10) to move in the horizontal direction in the process of being screwed in and out, so that the second pushing piece (10) drives the first pushing piece (9) and the piston piece (7) to ascend and descend.

3. The apparatus of claim 2, wherein: The first pushing piece (9) comprises 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 with the bottom of the piston piece (7), and the bottom surface of the pushing block (91) is in an inclined surface structure; the second pushing piece (10) is in a conical frustum structure, and the second pushing piece (10) is used for abutting the bottom surface of the pushing block (91) through the side wall of the inclined structure.

4. The apparatus of claim 2, wherein: The side surface of the mounting frame (5) away from the first support (2) is provided with a side cover (51), the side cover (51) is connected with the mounting frame (5) through bolts, the rotating piece (6) is arranged on the side cover (51) and is connected with the side cover (51) through screw threads, and the second end of the rotating piece (6) is provided with a hand wheel (61).

5. The apparatus of claim 1 wherein, The top of the first support (2) is provided with a top cover (23), and a compression spring (8) is arranged in the oil storage cavity (22) and is pressed between the top cover (23) and the piston piece (7).

6. The apparatus of claim 1 wherein, The limiting piece (4) comprises telescopic side plates (42) and limiting side plates (43), the outer wall of the limiting side plates (43) is used for abutting against the inner hole of the support shaft flow case (100), and the telescopic side plates (42) are arranged on the inner wall of the limiting side plates (43) in a circumferential direction and are used for forming a pressure regulating cavity (44) together with the limiting side plates (43), and each telescopic side plate (42) is used for being connected with the tail end of the second support (3).

7. The axial flow casing coating hole and flow channel processing device according to claim 6, characterized in that: The limiting piece (4) further comprises a connecting side plate (41), the connecting side plate (41) is arranged on the end face of the telescopic side plate (42) close to the second support (3), the tail end of the second support (3) is provided with a boss-shaped mounting platform (32), and the connecting side plate (41) is used for being attached to the mounting platform (32) and being connected and fastened by bolts.

8. A device for machining holes and flow passages in a coating of an axial-flow machine casing according to claim 6, characterized in that The telescopic side plate (42) is made of elastic material.

9. A method of processing a coating hole and a flow channel of an axial flow machine case, characterized by The shaft flow case coating hole and flow channel processing device and the shaft flow case coating hole and flow channel processing method adopt the steps of: S100, when the coating hole is processed, the large drill bit is used to stop at the coating position of the shaft flow case (100); S200, a small drill bit is used to form a small perforation by drilling through the coating; S300, the bottom of the small perforation of the coating in S200 is reamed by using a spiral milling method with a milling cutter; S400, the hole diameter of the reamed small perforation is processed in place by using a small feed method with a boring cutter; S500, when the flow channel of the case is processed, the two halves of the sprayed shaft flow case (100) are combined; S600, the sprayed flow channel is coarsely processed by a numerical control machining process, and a 0.25mm margin is reserved on one side, and the flow channel surface is turned in three layers during processing, and the stress is gradually released; S700, the combined shaft flow case (100) is disassembled into two half cases, and the case end reference is repaired; S800, the two half cases are combined, the flow channel area is precisely processed in place by supporting the large end of the shaft flow case (100).

10. The method of claim 9, wherein the method further comprises: In step S300, the reaming is performed in a manner of removing the margin by using a force parallel to the coating inclined surface; in step S600, the turning is performed in three layers during the coarse processing, and the part is re-aligned after each layer of turning, the first layer removes a margin of 0.5-0.6mm, the second layer removes a margin of 0.8-1mm, and the third layer removes a margin of 0.1-0.2mm, and the margin reserved after three times of cutting is 0.25mm on one side.

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