CN117020574A - Processing method of aero-engine bearing casing and aero-engine bearing casing - Google Patents
Processing method of aero-engine bearing casing and aero-engine bearing casing Download PDFInfo
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- CN117020574A CN117020574A CN202310864761.0A CN202310864761A CN117020574A CN 117020574 A CN117020574 A CN 117020574A CN 202310864761 A CN202310864761 A CN 202310864761A CN 117020574 A CN117020574 A CN 117020574A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
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- General Engineering & Computer Science (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
本发明公开了一种航空发动机轴承机匣加工方法，通过实现轴承机匣的毛坯件的加工基准到轴承机匣的机加件的加工基准的转换，再通过实现轴承机匣的机加件的加工基准到轴承机匣的焊后机加件的加工基准的转换，完成对轴承机匣的精密加工，同时通过对刀孔和引导管，增加滑油喷嘴孔加工时的可达性，相对于现有技术，保证了侧边凸台上进油孔的加工精度，防止进油孔因厚度不足而破裂，同时避免了焊接前后的轴承机匣上前安装边和后安装边变形对轴承机匣机加工造成的影响，并保证滑油喷嘴孔的加工质量，确保滑油喷嘴孔的流量和流向检测满足要求，实用性强，适于广泛推广和应用。本发明还公开了一种航空发动机轴承机匣。
The invention discloses a processing method of an aeroengine bearing casing. By realizing the conversion of the processing reference of the blank part of the bearing casing to the processing reference of the machined parts of the bearing casing, and then by realizing the processing of the machined parts of the bearing casing. The conversion of the machining datum to the machining datum of the post-weld machining parts of the bearing casing completes the precision machining of the bearing casing. At the same time, the accessibility of the lubricating oil nozzle hole is increased through the tool setting hole and guide tube. Compared with The existing technology ensures the machining accuracy of the oil inlet hole on the side boss, prevents the oil inlet hole from cracking due to insufficient thickness, and at the same time avoids the deformation of the front and rear mounting edges of the bearing casing before and after welding, which may cause damage to the bearing casing. The impact caused by processing is ensured, and the processing quality of the lubricating oil nozzle hole is ensured to ensure that the flow and flow direction detection of the lubricating oil nozzle hole meet the requirements. It is highly practical and suitable for widespread promotion and application. The invention also discloses an aeroengine bearing casing.
Description
Technical Field
The application relates to the technical field of aero-engine bearing casing machining, in particular to a method for machining an aero-engine bearing casing. In addition, the application also relates to the aero-engine bearing casing processed by adopting the aero-engine bearing casing processing method.
Background
The bearing casing part is an important stator part of an aeroengine turbine part, and is mainly used for lubricating a bearing and transmitting torque, and because the bearing casing is exquisite in structure and high in dimensional accuracy, comprises complex abnormal-shaped space structures such as an internal oil cavity and an oil passage pipeline, and the like, after the bearing casing is cast and formed, machining, subsequent welding and other machining procedures are needed to be adopted to ensure the quality of a finished product.
As shown in FIG. 1, the bearing casing is an annular part, the thickness of the wall body is thinner, usually 3mm, the cross-sectional structure of the bearing casing comprises a front mounting edge, a rear mounting edge, a supporting edge, an inner oil cavity, a lubricating oil nozzle hole and a side boss, a plurality of mounting holes are uniformly distributed on the front mounting edge and the rear mounting edge along the circumferential direction, meanwhile, the dimensional precision requirement of the bearing casing is high, and the dimensional requirement is usually 0.015 of flatness, 0.015 of parallelism, 0.02 of circular runout and strict lubricating oil irradiation requirement. Because the wall body of the bearing casing is thinner, welding and heat treatment procedures are needed in the processing process, the reference surface of the bearing casing is easy to deform, a series of precise dimensions related to the reference surface are often out of tolerance, the processing accessibility of the lubricating oil injection hole is poor, the lubricating oil injection divergence or jet direction deviation is easy to occur, and the finished product of the bearing casing processed cannot meet the use requirement and is scrapped.
Therefore, the following difficulties mainly exist in the processing of the bearing casing: 1. because of the standard deviation between the machining standard of the blank of the cast bearing casing and the machining standard of the machined part in the machining process, the side boss of the bearing casing has larger deviation during machining, and the risk of cracking due to insufficient wall thickness exists during machining of the oil inlet hole on the side boss; 2. the machining accessibility of the lubricating oil nozzle hole is poor, the electrode is obviously swung during machining, and the machined lubricating oil nozzle hole is easy to cause the conditions of lubricating oil jet divergence or jet direction deviation and the like of the bearing casing; 3. the deformation of about 0.5-0.6 mm exists on each mounting edge of the bearing casing before and after welding, so that the difficulty in machining the bearing casing is increased, and the machining quality of the bearing casing is not easy to guarantee.
Disclosure of Invention
The application provides a processing method of an aeroengine bearing casing and the aeroengine bearing casing, which are used for solving the technical problems that an oil inlet hole on a side boss in the processing process of the existing aeroengine bearing casing is easy to break, the processing accessibility of an oil nozzle hole is poor, the oil injection is dispersed or the jet direction is deviated, and the mounting edges of the bearing casing are deformed before and after welding, so that the processing difficulty is high.
According to one aspect of the present application, there is provided a machining method of an aero-engine bearing casing for machining a blank of a cast-formed bearing casing into a finished product, the bearing casing including a front mounting edge, a rear mounting edge, a supporting edge, a side boss, an internal oil cavity and a lubricating oil nozzle hole, the method specifically comprising the steps of: machining a rear mounting edge according to the axial standard of a blank of the bearing casing, machining an axial standard of a machined part of the bearing casing on the rear mounting edge, machining an inner hole wall of a supporting edge, which is close to a front mounting edge, according to the axial standard of the machined part of the bearing casing and the central standard of the blank of the bearing casing to obtain the central standard of the machined part of the bearing casing, and finally machining an angular standard hole of the machined part of the bearing casing according to the axial standard of the machined part of the bearing casing, the central standard of the machined part of the bearing casing and the angular standard of the blank of the bearing casing, machining an annular oil groove at an inner oil cavity, and welding an annular cover plate on the annular oil groove to seal the inner oil cavity; b, machining a front mounting edge according to an axial reference of a machined part of the bearing casing, machining an axial reference of a welded machined part of the bearing casing on the front mounting edge, machining an inner hole wall of a supporting edge, which is close to the rear mounting edge, according to the axial reference of the welded machined part of the bearing casing and a central reference of the machined part of the bearing casing, so as to obtain a central reference of the welded machined part of the bearing casing, and finally sequentially machining an oil inlet hole on a side boss, a front mounting hole on the front mounting edge and a rear mounting hole on the rear mounting edge according to the axial reference of the welded machined part of the bearing casing, the central reference of the welded machined part of the bearing casing and an angular reference hole of the machined part of the bearing casing; and C, fixing the bearing casing according to the axial standard of the post-welding machine adding part of the bearing casing, the central standard of the post-welding machine adding part of the bearing casing and the angular standard hole of the machine adding part of the bearing casing, and arranging a tool setting hole and a guide pipe on the inner hole wall of the supporting edge, so as to machine a lubricating oil nozzle hole communicated with the inner oil cavity by utilizing an electric spark process.
As a further improvement of the above technical scheme:
further, the step A specifically comprises the following steps: a1, a front mounting edge of a blank of a bearing casing is supported, so that a side boss scribing position of the blank of the bearing casing serving as an axial reference of the blank of the bearing casing is aligned, a rear mounting edge of the blank of the bearing casing is processed, and a first supporting surface serving as an axial reference of a machined part of the bearing casing is processed on the rear mounting edge of the blank of the bearing casing, so that the conversion from the axial reference of the blank of the bearing casing to the axial reference of the machined part of the bearing casing is realized; a2, bearing against the first bearing surface to align the center reference circle of the blank of the bearing casing, which is used as the center reference of the blank of the bearing casing, processing the inner hole wall of the supporting edge of the blank of the bearing casing, which is close to the front mounting edge, and taking the inner hole wall of the supporting edge, which is close to the front mounting edge, as the center reference of the machined part of the bearing casing, thereby realizing the conversion from the center reference of the blank of the bearing casing to the center reference of the machined part of the bearing casing; a3, supporting the first supporting surface to fix the axial reference, aligning the inner hole wall of the supporting edge close to the front mounting edge to fix the central reference, aligning the lateral boss of the bearing casing to fix the angular reference, establishing a workpiece coordinate system according to the axial reference, the central reference and the angular reference, drilling a lateral boss to a preset depth through a pre-drilling center machining program, checking whether the pre-drilling center hole of the lateral boss is at the center of the lateral boss after the drilling is finished, adjusting the workpiece coordinate system if the pre-drilling center hole is deviated, repeating the pre-drilling center hole step until the pre-drilling center hole of the lateral boss coincides with the center of the lateral boss, machining the angular reference hole on the front mounting edge to serve as the angular reference of a machined part of the bearing casing, and milling an annular oil groove at an inner oil cavity; and A4, welding an annular cover plate on the annular oil groove to seal the internal oil cavity, and performing stress relief treatment and tightness test after welding.
Further, the steps between the steps A3 and A4 further comprise the steps of: a31, polishing and trimming the bearing casing to remove burrs and flashes generated in the machining process of the steps A1-A3.
Further, the steps between the step a31 and the step A4 include: a32, performing fluorescent inspection on the annular oil groove.
Further, the steps between the step A4 and the step B include the following steps: and A5, filling wax into the inner oil cavity by adopting a wax filling process.
Further, the steps between the step B and the step C include the following steps: and (5) carrying out wax removal treatment on the internal oil cavity.
Further, the step B specifically comprises the following steps: b1, bearing against the first bearing surface, in order to process the front mounting edge of the blank of the bearing cartridge receiver, and process the second bearing surface as axial benchmark of the post-welding machine tool of the bearing cartridge receiver on the front mounting edge of the blank of the bearing cartridge receiver, so as to realize the conversion from the axial benchmark of the machine tool of the bearing cartridge receiver to the axial benchmark of the post-welding machine tool of the bearing cartridge receiver; b2, supporting the second supporting surface to align the inner hole wall of the supporting edge, which is used as the center benchmark of the machined part of the bearing casing, close to the front mounting edge, processing the inner hole wall of the supporting edge, which is used as the center benchmark of the welded machined part of the bearing casing, of the blank of the bearing casing, and converting the center benchmark of the machined part of the bearing casing into the center benchmark of the welded machined part of the bearing casing; and B3, supporting the second supporting surface to fix the axial reference, aligning the inner hole wall of the supporting edge close to the rear mounting edge to fix the central reference, aligning the angular reference hole to fix the angular reference, machining the upper oil inlet hole on the side boss by adopting a five-axis process, and machining the mounting hole on the front mounting edge and the mounting hole on the rear mounting edge according to the angular reference Kong Yici.
Further, the steps between the step B3 and the step C include the following steps: and B4, supporting the second supporting surface, aligning the inner hole wall of the supporting edge close to the rear mounting edge, and processing the inner hole wall of the supporting edge of the bearing casing by adopting a grinding process.
Further, the step C further comprises the following steps: d, sealing the inner hole of the supporting edge, and flushing the internal oil cavity by adopting a flushing device; and E, carrying out flow and direction test on the lubricating oil nozzle holes.
According to another aspect of the application, an aero-engine bearing casing is provided, which is manufactured by the aero-engine bearing casing processing method.
The application has the following beneficial effects:
according to the processing method of the aeroengine bearing casing, the rear mounting edge is processed according to the axial standard of the blank of the bearing casing, the axial standard of the machined part of the bearing casing is processed on the rear mounting edge, then the inner hole wall of the machined part of the bearing casing, which is close to the front mounting edge, is processed according to the axial standard of the machined part of the bearing casing and the central standard of the blank of the bearing casing, so that the central standard of the machined part of the bearing casing is obtained, finally the angular standard holes of the machined part of the bearing casing are processed according to the axial standard of the machined part of the bearing casing, the central standard and the angular standard of the machined part of the bearing casing, the axial standard, the central standard and the angular standard of the machined part of the bearing casing are converted into the axial standard, the central standard and the angular standard of the machined part of the bearing casing, the machining standard of the machined part of the bearing casing and the reference deviation between the machined standard of the machined part of the bearing casing are avoided, the machining precision of the machined side wall boss on the side wall boss in the subsequent machining process is ensured, the annular oil inlet boss is completely broken when the annular oil groove is completely sealed inside the annular oil groove is formed, and the annular oil groove is completely sealed inside the annular oil groove is formed; processing a front mounting edge according to an axial reference of a machined part of the bearing casing, processing an axial reference of a welded machined part of the bearing casing on the front mounting edge, then processing an inner hole wall of a supporting edge, which is close to a rear mounting edge, according to the axial reference of the welded machined part of the bearing casing and a central reference of the machined part of the bearing casing, so as to obtain the central reference of the welded machined part of the bearing casing, and finally sequentially processing an oil inlet hole on a side boss, a front mounting hole on the front mounting edge and a rear mounting hole on the rear mounting edge according to the axial reference of the welded machined part of the bearing casing, the central reference of the welded machined part of the bearing casing and the central reference of the machined part of the bearing casing, so that the deformation of the welded front mounting edge, the welded part and the welded part of the machined part of the bearing casing is prevented from affecting the machining of the bearing casing, and the machined part of the bearing casing is greatly reduced, and the machining difficulty of the bearing casing is greatly ensured; according to the axial standard of the post-welding machining part of the bearing casing, the central standard of the post-welding machining part of the bearing casing and the angular standard hole of the machining part of the bearing casing, the bearing casing is fixed, and a cutter setting hole and a guide pipe are arranged on the inner hole wall of the supporting edge, and then the lubricating oil nozzle hole communicated with the internal oil cavity is machined by utilizing an electric spark process.
In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. The present application will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic view of a prior art bearing cartridge receiver;
fig. 2 is a block flow diagram of a method of machining an aero-engine bearing case in accordance with a preferred embodiment of the present application.
Detailed Description
Embodiments of the application are described in detail below with reference to the attached drawing figures, but the application can be practiced in a number of different ways, as defined and covered below.
FIG. 1 is a schematic view of a prior art bearing cartridge receiver; fig. 2 is a block flow diagram of a method of machining an aero-engine bearing case in accordance with a preferred embodiment of the present application.
As shown in fig. 1 and 2, the processing method of the aero-engine bearing casing according to the present embodiment is used for machining a blank of a cast-formed bearing casing into a finished product, the bearing casing includes a front mounting edge, a rear mounting edge, a supporting edge, a side boss, an internal oil cavity and a lubricating oil nozzle hole, and specifically includes the following steps: machining a rear mounting edge according to the axial standard of a blank of the bearing casing, machining an axial standard of a machined part of the bearing casing on the rear mounting edge, machining an inner hole wall of a supporting edge, which is close to a front mounting edge, according to the axial standard of the machined part of the bearing casing and the central standard of the blank of the bearing casing to obtain the central standard of the machined part of the bearing casing, and finally machining an angular standard hole of the machined part of the bearing casing according to the axial standard of the machined part of the bearing casing, the central standard of the machined part of the bearing casing and the angular standard of the blank of the bearing casing, machining an annular oil groove at an inner oil cavity, and welding an annular cover plate on the annular oil groove to seal the inner oil cavity; b, machining a front mounting edge according to an axial reference of a machined part of the bearing casing, machining an axial reference of a welded machined part of the bearing casing on the front mounting edge, machining an inner hole wall of a supporting edge, which is close to the rear mounting edge, according to the axial reference of the welded machined part of the bearing casing and a central reference of the machined part of the bearing casing, so as to obtain a central reference of the welded machined part of the bearing casing, and finally sequentially machining an oil inlet hole on a side boss, a front mounting hole on the front mounting edge and a rear mounting hole on the rear mounting edge according to the axial reference of the welded machined part of the bearing casing, the central reference of the welded machined part of the bearing casing and an angular reference hole of the machined part of the bearing casing; and C, fixing the bearing casing according to the axial standard of the post-welding machine adding part of the bearing casing, the central standard of the post-welding machine adding part of the bearing casing and the angular standard hole of the machine adding part of the bearing casing, and arranging a tool setting hole and a guide pipe on the inner hole wall of the supporting edge, so as to machine a lubricating oil nozzle hole communicated with the inner oil cavity by utilizing an electric spark process. Specifically, the processing method of the aeroengine bearing casing comprises the steps of processing a rear mounting edge according to an axial reference of a blank of the bearing casing, processing an axial reference of a machined part of the bearing casing on the rear mounting edge, then processing an inner hole wall of a support edge close to a front mounting edge according to the axial reference of the machined part of the bearing casing and the central reference of the blank of the bearing casing so as to obtain the central reference of the machined part of the bearing casing, and finally processing an angular reference hole of the machined part of the bearing casing according to the axial reference of the machined part of the bearing casing, the central reference and the angular reference of the blank of the bearing casing, so that the axial reference, the central reference and the angular reference of the blank of the bearing casing are converted into the axial reference, the central reference and the angular reference of the machined part of the bearing casing, the standard deviation between the machining reference of the blank of the bearing casing and the machining reference of the machined part of the bearing casing is avoided, the machining oil inlet hole in a side wall boss is ensured, the oil inlet hole is completely prevented from being broken in an annular oil groove in the subsequent machining process, and the annular oil groove is simultaneously formed in the annular cover plate is welded at the inner wall thickness; processing a front mounting edge according to an axial reference of a machined part of the bearing casing, processing an axial reference of a welded machined part of the bearing casing on the front mounting edge, then processing an inner hole wall of a supporting edge, which is close to a rear mounting edge, according to the axial reference of the welded machined part of the bearing casing and a central reference of the machined part of the bearing casing, so as to obtain the central reference of the welded machined part of the bearing casing, and finally sequentially processing an oil inlet hole on a side boss, a front mounting hole on the front mounting edge and a rear mounting hole on the rear mounting edge according to the axial reference of the welded machined part of the bearing casing, the central reference of the welded machined part of the bearing casing and the central reference of the machined part of the bearing casing, so that the deformation of the welded front mounting edge, the welded part and the welded part of the machined part of the bearing casing is prevented from affecting the machining of the bearing casing, and the machined part of the bearing casing is greatly reduced, and the machining difficulty of the bearing casing is greatly ensured; according to the axial standard of the post-welding machining part of the bearing casing, the central standard of the post-welding machining part of the bearing casing and the angular standard hole of the machining part of the bearing casing, the bearing casing is fixed, and a cutter setting hole and a guide pipe are arranged on the inner hole wall of the supporting edge, and then the lubricating oil nozzle hole communicated with the internal oil cavity is machined by utilizing an electric spark process. It should be understood that in this embodiment, when the reference conversion or the machining of the bearing casing is performed, a special fixture is used for clamping and fixing, so as to ensure the machining precision. It should be understood that the specific structure of the special fixture belongs to the technology known to those skilled in the art, and is not repeated here.
In this embodiment, the step a specifically includes the following steps: a1, a front mounting edge of a blank of a bearing casing is supported, so that a side boss scribing position of the blank of the bearing casing serving as an axial reference of the blank of the bearing casing is aligned, a rear mounting edge of the blank of the bearing casing is processed, and a first supporting surface serving as an axial reference of a machined part of the bearing casing is processed on the rear mounting edge of the blank of the bearing casing, so that the conversion from the axial reference of the blank of the bearing casing to the axial reference of the machined part of the bearing casing is realized; a2, bearing against the first bearing surface to align the center reference circle of the blank of the bearing casing, which is used as the center reference of the blank of the bearing casing, processing the inner hole wall of the supporting edge of the blank of the bearing casing, which is close to the front mounting edge, and taking the inner hole wall of the supporting edge, which is close to the front mounting edge, as the center reference of the machined part of the bearing casing, thereby realizing the conversion from the center reference of the blank of the bearing casing to the center reference of the machined part of the bearing casing; a3, supporting the first supporting surface to fix the axial reference, aligning the inner hole wall of the supporting edge close to the front mounting edge to fix the central reference, aligning the lateral boss of the bearing casing to fix the angular reference, establishing a workpiece coordinate system according to the axial reference, the central reference and the angular reference, drilling a lateral boss to a preset depth through a pre-drilling center machining program, checking whether the pre-drilling center hole of the lateral boss is at the center of the lateral boss after the drilling is finished, adjusting the workpiece coordinate system if the pre-drilling center hole is deviated, repeating the pre-drilling center hole step until the pre-drilling center hole of the lateral boss coincides with the center of the lateral boss, machining the angular reference hole on the front mounting edge to serve as the angular reference of a machined part of the bearing casing, and milling an annular oil groove at an inner oil cavity; and A4, welding an annular cover plate on the annular oil groove to seal the internal oil cavity, and performing stress relief treatment and tightness test after welding. Specifically, the conversion from the axial reference of the blank of the bearing casing to the axial reference of the machined part of the bearing casing is realized through the step A1, the conversion from the center reference of the blank of the bearing casing to the center reference of the machined part of the bearing casing is realized through the step A2, the conversion from the angular reference of the blank of the bearing casing to the angular reference of the machined part of the bearing casing is realized through the step A3, the machining precision in the machining process of the bearing casing is ensured, and finally the welding quality and the sealing requirement of an internal oil cavity in the process of welding the annular cover plate are ensured through the step A4. It should be understood that the side boss score line refers to a score line that is preset on the side boss of the blank member of the bearing cartridge case before the blank member is processed. It should be understood that the bearing casing is provided with a plurality of side bosses arranged along the circumferential direction, and any two side bosses are aligned to be the angular references of the blank of the bearing casing.
In this embodiment, the steps between the steps A3 and A4 further include: a31, polishing and trimming the bearing casing to remove burrs and flashes generated in the machining process of the steps A1-A3. Specifically, by polishing and trimming the bearing housing, the entry of excessive foreign matter into the internal oil chamber is avoided.
In this embodiment, the steps between the step a31 and the step A4 further include: a32, performing fluorescent inspection on the annular oil groove. Specifically, defects such as cracks and impurities in the annular oil groove are eliminated through fluorescent inspection.
In this embodiment, the steps between the step A4 and the step B further include: and A5, filling wax into the inner oil cavity by adopting a wax filling process. Specifically, through the wax filling process, excessive foreign matters in the subsequent machining process are prevented from entering the internal oil cavity.
In this embodiment, the steps between the step B and the step C further include: and (5) carrying out wax removal treatment on the internal oil cavity. Specifically, after the bearing casing is machined to remove the large allowance, wax in the inner oil cavity can be removed, and wax residues in the inner oil cavity are prevented.
In this embodiment, the step B specifically includes the following steps: b1, bearing against the first bearing surface, in order to process the front mounting edge of the blank of the bearing cartridge receiver, and process the second bearing surface as axial benchmark of the post-welding machine tool of the bearing cartridge receiver on the front mounting edge of the blank of the bearing cartridge receiver, so as to realize the conversion from the axial benchmark of the machine tool of the bearing cartridge receiver to the axial benchmark of the post-welding machine tool of the bearing cartridge receiver; b2, supporting the second supporting surface to align the inner hole wall of the supporting edge, which is used as the center benchmark of the machined part of the bearing casing, close to the front mounting edge, processing the inner hole wall of the supporting edge, which is used as the center benchmark of the welded machined part of the bearing casing, of the blank of the bearing casing, and converting the center benchmark of the machined part of the bearing casing into the center benchmark of the welded machined part of the bearing casing; and B3, supporting the second supporting surface to fix the axial reference, aligning the inner hole wall of the supporting edge close to the rear mounting edge to fix the central reference, aligning the angular reference hole to fix the angular reference, machining the upper oil inlet hole on the side boss by adopting a five-axis process, and machining the mounting hole on the front mounting edge and the mounting hole on the rear mounting edge according to the angular reference Kong Yici. Specifically, firstly, the conversion from the axial reference of the machined part of the bearing casing to the axial reference of the welded machined part of the bearing casing is realized through the step B1, then the conversion from the central reference of the machined part of the bearing casing to the central reference of the welded machined part of the bearing casing is realized through the step B2, and finally, the processing of the oil inlet hole on the side wall boss, the mounting hole on the front mounting edge and the mounting hole on the rear mounting edge is finished through the step B3.
In this embodiment, the steps between the step B3 and the step C further include: and B4, supporting the second supporting surface, aligning the inner hole wall of the supporting edge close to the rear mounting edge, and processing the inner hole wall of the supporting edge of the bearing casing by adopting a grinding process. Specifically, the roughness and the circle runout of the inner hole wall of the supporting edge of the bearing casing are ensured to meet the requirements through a grinding process.
In this embodiment, the step C further includes the steps of: d, sealing the inner hole of the supporting edge, and flushing the internal oil cavity by adopting a flushing device; and E, carrying out flow and direction test on the lubricating oil nozzle holes. Specifically, the flushing device flushes the internal oil cavity, removes unnecessary substances possibly existing in the internal oil cavity, and ensures that the machining quality of the lubricating oil nozzle hole meets the requirements through a flow direction test. Optionally, the flow direction test comprises the steps of: the bearing frame is respectively clamped by a flow test fixture and a flow direction test fixture, an oil receiving pipe and a standard target hole are arranged on the fixtures, so that the flow and the direction of the lubricating oil nozzle hole are recorded by a loss device to verify whether the flow and the direction of the lubricating oil nozzle hole meet the design requirements,
the aero-engine bearing casing of the embodiment is manufactured by the aero-engine bearing casing processing method. Specifically, the blank of the bearing casing formed by casting is processed into a finished product by adopting the processing method of the aeroengine bearing casing, in the machining process of the bearing casing, a special fixture is adopted to restrict the machining part, so that the interchangeability is improved, the dependence on the operation level of a skilled worker is reduced, and the internal oil cavity is protected and flushed by wax filling, so that the occurrence of excessive materials in the internal oil cavity is avoided, the precision size of the bearing casing and the flow direction of a lubricating oil nozzle hole are ensured to meet the requirements, the qualification rate of the finished product is greatly improved, and the method is high in practicability and suitable for wide popularization and application.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The machining method for the aero-engine bearing casing is used for machining a blank of the cast and formed bearing casing into a finished product, and the bearing casing comprises a front mounting edge, a rear mounting edge, a supporting edge, a side boss, an internal oil cavity and a lubricating oil nozzle hole, and is characterized by specifically comprising the following steps of:
machining a rear mounting edge according to the axial standard of a blank of the bearing casing, machining an axial standard of a machined part of the bearing casing on the rear mounting edge, machining an inner hole wall of a supporting edge, which is close to a front mounting edge, according to the axial standard of the machined part of the bearing casing and the central standard of the blank of the bearing casing to obtain the central standard of the machined part of the bearing casing, and finally machining an angular standard hole of the machined part of the bearing casing according to the axial standard of the machined part of the bearing casing, the central standard of the machined part of the bearing casing and the angular standard of the blank of the bearing casing, machining an annular oil groove at an inner oil cavity, and welding an annular cover plate on the annular oil groove to seal the inner oil cavity;
b, machining a front mounting edge according to an axial reference of a machined part of the bearing casing, machining an axial reference of a welded machined part of the bearing casing on the front mounting edge, machining an inner hole wall of a supporting edge, which is close to the rear mounting edge, according to the axial reference of the welded machined part of the bearing casing and a central reference of the machined part of the bearing casing, so as to obtain a central reference of the welded machined part of the bearing casing, and finally sequentially machining an oil inlet hole on a side boss, a front mounting hole on the front mounting edge and a rear mounting hole on the rear mounting edge according to the axial reference of the welded machined part of the bearing casing, the central reference of the welded machined part of the bearing casing and an angular reference hole of the machined part of the bearing casing;
and C, fixing the bearing casing according to the axial standard of the post-welding machine adding part of the bearing casing, the central standard of the post-welding machine adding part of the bearing casing and the angular standard hole of the machine adding part of the bearing casing, and arranging a tool setting hole and a guide pipe on the inner hole wall of the supporting edge, so as to machine a lubricating oil nozzle hole communicated with the inner oil cavity by utilizing an electric spark process.
2. The method for machining an aero-engine bearing casing according to claim 1, wherein the step a specifically comprises the steps of:
a1, a front mounting edge of a blank of a bearing casing is supported, so that a side boss scribing position of the blank of the bearing casing serving as an axial reference of the blank of the bearing casing is aligned, a rear mounting edge of the blank of the bearing casing is processed, and a first supporting surface serving as an axial reference of a machined part of the bearing casing is processed on the rear mounting edge of the blank of the bearing casing, so that the conversion from the axial reference of the blank of the bearing casing to the axial reference of the machined part of the bearing casing is realized;
a2, bearing against the first bearing surface to align the center reference circle of the blank of the bearing casing, which is used as the center reference of the blank of the bearing casing, processing the inner hole wall of the supporting edge of the blank of the bearing casing, which is close to the front mounting edge, and taking the inner hole wall of the supporting edge, which is close to the front mounting edge, as the center reference of the machined part of the bearing casing, thereby realizing the conversion from the center reference of the blank of the bearing casing to the center reference of the machined part of the bearing casing;
a3, supporting the first supporting surface to fix the axial reference, aligning the inner hole wall of the supporting edge close to the front mounting edge to fix the central reference, aligning the lateral boss of the bearing casing to fix the angular reference, establishing a workpiece coordinate system according to the axial reference, the central reference and the angular reference, drilling a lateral boss to a preset depth through a pre-drilling center machining program, checking whether the pre-drilling center hole of the lateral boss is at the center of the lateral boss after the drilling is finished, adjusting the workpiece coordinate system if the pre-drilling center hole is deviated, repeating the pre-drilling center hole step until the pre-drilling center hole of the lateral boss coincides with the center of the lateral boss, machining the angular reference hole on the front mounting edge to serve as the angular reference of a machined part of the bearing casing, and milling an annular oil groove at an inner oil cavity;
and A4, welding an annular cover plate on the annular oil groove to seal the internal oil cavity, and performing stress relief treatment and tightness test after welding.
3. The method of machining an aero-engine bearing casing according to claim 2, further comprising the step of, between steps A3 and A4:
a31, polishing and trimming the bearing casing to remove burrs and flashes generated in the machining process of the steps A1-A3.
4. The method of machining an aero-engine bearing casing according to claim 3, further comprising the steps of, between step a31 and step A4:
a32, performing fluorescent inspection on the annular oil groove.
5. The method of machining an aero-engine bearing casing according to claim 2, further comprising the steps between step A4 and step B:
and A5, filling wax into the inner oil cavity by adopting a wax filling process.
6. The method of machining an aero-engine bearing casing according to claim 5, further comprising the steps of:
and (5) carrying out wax removal treatment on the internal oil cavity.
7. The aircraft engine bearing case machining method according to claim 2, wherein step B specifically comprises the steps of:
b1, bearing against the first bearing surface, in order to process the front mounting edge of the blank of the bearing cartridge receiver, and process the second bearing surface as axial benchmark of the post-welding machine tool of the bearing cartridge receiver on the front mounting edge of the blank of the bearing cartridge receiver, so as to realize the conversion from the axial benchmark of the machine tool of the bearing cartridge receiver to the axial benchmark of the post-welding machine tool of the bearing cartridge receiver;
b2, supporting the second supporting surface to align the inner hole wall of the supporting edge, which is used as the center benchmark of the machined part of the bearing casing, close to the front mounting edge, processing the inner hole wall of the supporting edge, which is used as the center benchmark of the welded machined part of the bearing casing, of the blank of the bearing casing, and converting the center benchmark of the machined part of the bearing casing into the center benchmark of the welded machined part of the bearing casing;
and B3, supporting the second supporting surface to fix the axial reference, aligning the inner hole wall of the supporting edge close to the rear mounting edge to fix the central reference, aligning the angular reference hole to fix the angular reference, machining the upper oil inlet hole on the side boss by adopting a five-axis process, and machining the mounting hole on the front mounting edge and the mounting hole on the rear mounting edge according to the angular reference Kong Yici.
8. The method of machining an aero-engine bearing casing according to claim 7, further comprising the steps of:
and B4, supporting the second supporting surface, aligning the inner hole wall of the supporting edge close to the rear mounting edge, and processing the inner hole wall of the supporting edge of the bearing casing by adopting a grinding process.
9. The aircraft engine bearing case machining method according to any one of claims 1 to 8, further comprising the step of, after step C:
d, sealing the inner hole of the supporting edge, and flushing the internal oil cavity by adopting a flushing device;
and E, carrying out flow and direction test on the lubricating oil nozzle holes.
10. An aero-engine bearing casing, characterized in that it is manufactured by the aero-engine bearing casing manufacturing method according to any one of claims 1-9.
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