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CN114700537B - Positioning numerical milling fixture and numerical milling processing method for metal sealing ring of power turbine casing - Google Patents

Positioning numerical milling fixture and numerical milling processing method for metal sealing ring of power turbine casing Download PDF

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Publication number
CN114700537B
CN114700537B CN202210439909.1A CN202210439909A CN114700537B CN 114700537 B CN114700537 B CN 114700537B CN 202210439909 A CN202210439909 A CN 202210439909A CN 114700537 B CN114700537 B CN 114700537B
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China
Prior art keywords
sealing ring
positioning
metal sealing
groove
angular
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Chinese (zh)
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CN114700537A (en
Inventor
龚丽丽
黄如
胡慧伶
吕晓波
赵淑红
汪晶晶
王道
王瑜
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Hunan Nanfang General Aviation Engine Co ltd
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Hunan Nanfang General Aviation Engine Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/06—Work-clamping means
    • B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
    • B23Q3/10—Auxiliary devices, e.g. bolsters, extension members

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)
  • Gasket Seals (AREA)

Abstract

The invention discloses a positioning milling fixture and a milling processing method of a metal sealing ring of a power turbine casing, wherein a limiting groove is formed in a bottom plate of the positioning milling fixture for placing the metal sealing ring to be processed, an angular positioning plug block, an axial positioning assembly and a radial positioning assembly are used for respectively positioning the metal sealing ring in an angular direction, an axial direction and a radial direction, the position of the angular positioning groove is obtained by carrying out pre-deformation conversion on the basis of the diameter in a free state and the diameter in a working state and combining with the design drawing size of an opening, the positioning milling fixture corresponds to the position of the end part of the hook-shaped opening of the metal sealing ring in the working state, the number milling processing of the hook-shaped opening of the metal sealing ring in the working state is simulated, the problem that the size of the existing metal sealing ring is out of tolerance due to the existence of a bell mouth after the metal sealing ring is processed in the free state is solved, and the processed size of the metal sealing ring in the free state can accurately reach the size requirement in the working state.

Description

Positioning numerical milling fixture and numerical milling processing method for metal sealing ring of power turbine casing
Technical Field
The invention relates to the technical field of machining of metal sealing rings of power turbine cases, in particular to a positioning and milling clamp, and in addition, particularly relates to a method for milling the metal sealing rings of the power turbine cases by adopting the positioning and milling clamp.
Background
As shown in fig. 1, the metal sealing ring of the power turbine casing is a thin-wall annular opening piece, and plays a role in sealing in an engine, and the service life of the engine is directly influenced by the good performance of the metal sealing ring. At present, when a hook-shaped opening for machining a metal sealing ring of a power turbine casing is subjected to milling, as a part is machined in a free state, the part is put into a measuring ring to simulate a working state for detection after machining is finished, the difference of the sizes of the hook-shaped opening is large, the machined size of the part is unqualified, and the rejection rate and the repair rate of the part are high. Specifically, as shown in fig. 2 and 3, the profile size requirements at the hook-shaped opening are specifically: (1), amplification at E in the measuring ring: the axial clearance at the position 2 is 0 to 0.05, the radial dimension at the position 2 is 3.05 to 3.30, and the thickness difference is 0.02 to 2); (2), a vision enlargement in measuring ring: the size of the opening at the position of the second part is 4.75-5.15, the radial clearance is 0-0.05, the thickness of the molded surface at the position of the second part is 1.07-1.21, when the surface D contacts, the surface B is checked by surface typing, and the surface C is allowed to be lower than the surface B by 0.025 max. When the measuring ring is put into the measuring ring for detection after machining in a free state, the numerical milling machining sizes (1), (4) and (6) at the opening cannot meet the drawing requirements, and the sizes (2), (3) and (5) can meet the drawing requirements after being machined and repaired for many times.
Disclosure of Invention
The invention provides a positioning numerical milling fixture and a numerical milling machining method of a metal sealing ring of a power turbine casing, which are used for solving the technical problem that the machining size is unqualified when the hook-shaped opening of the metal sealing ring of the power turbine casing is subjected to numerical milling machining in the free state.
According to one aspect of the invention, a positioning milling fixture is provided, which comprises a bottom plate, an axial positioning assembly, a radial positioning assembly and an angular positioning plug block, wherein the axial positioning assembly, the radial positioning assembly and the angular positioning plug block are all installed on the bottom plate, a limiting groove is formed in the bottom plate and used for placing a metal sealing ring to be processed, the axial positioning assembly is used for axially positioning the metal sealing ring, the radial positioning assembly is used for radially positioning the metal sealing ring, an angular positioning groove is formed in the bottom plate, the position of the angular positioning groove corresponds to the position of the hook-shaped opening end part of the metal sealing ring in a working state, and the angular positioning plug block is inserted into the angular positioning groove to perform angular positioning on the metal sealing ring based on the diameter of the metal sealing ring in a free state and the diameter of the metal sealing ring in the working state.
Further, the number of the axial positioning assemblies is multiple, and the axial positioning assemblies are distributed on the bottom plate at intervals.
Further, the axial positioning assembly comprises a pressing plate, a bushing mounting screw, a pressing plate locking screw and a flat washer, wherein the bushing is fixedly mounted on the bottom plate through the bushing mounting screw, the upper end face of the bushing is flush with the upper end face of the bottom plate, the pressing plate is located above the bushing, a slotted hole is formed in the pressing plate, the flat washer is located between the pressing plate locking screw and the pressing plate, and the pressing plate locking screw is matched with the bushing and locked on the pressing plate after passing through the slotted hole.
Further, the pressing plate at the opening of the metal sealing ring is a pointed pressing plate and is used for pressing the boss of the hook-shaped opening when the groove of the hook-shaped opening is subjected to finish machining.
Further, the radial positioning assembly is located in the surrounding space of the limiting groove and comprises a sliding block, a groove block mounting screw, a knurling screw and a spring, the groove block is fixedly mounted on the bottom plate through the groove block mounting screw, a sliding groove which is radially arranged is formed in the groove block, the sliding block is arranged in the sliding groove and can slide back and forth along the sliding groove, the knurling screw is rotatably mounted on the groove block, one end of the knurling screw penetrates through the groove block and stretches into the sliding groove to be matched with the sliding block, one end of the spring is fixedly connected with the sliding block, the other end of the spring is fixedly connected with the groove wall of the groove block, and the knurling screw is rotated to push the sliding block to slide along the radial direction.
Further, a slotted hole is formed in the position, corresponding to the slotted hole block mounting screw, of the sliding block, the slotted hole block mounting screw penetrates through the slotted hole and the slotted block and then is fixed on the bottom plate, and the sliding stroke of the sliding block is limited through the slotted hole block mounting screw.
In addition, the invention also provides a numerical milling method for the metal sealing ring of the power turbine casing, which adopts the positioning numerical milling fixture and comprises the following steps:
mounting a positioning number milling fixture on a processing machine tool;
inserting the angular positioning plug block into the angular positioning groove;
placing a metal sealing ring with an opening into a limiting groove, and enabling a first end of the opening of the metal sealing ring to lean against the angular positioning chock;
radial positioning and axial positioning are carried out on the metal sealing ring by utilizing the radial positioning assembly and the axial positioning assembly;
milling the first end of the metal sealing ring;
and loosening the radial positioning assembly and the axial positioning assembly, abutting the second end of the opening of the metal sealing ring on the angular positioning plug, repeating the above steps, and carrying out numerical milling on the second end of the opening of the metal sealing ring.
Further, the process of using the radial positioning assembly and the rest of the axial positioning assemblies to radially position and axially position the metal sealing ring specifically comprises the following steps:
firstly, tightly attaching the outer circle of the metal sealing ring to the outer circumferential surface of the limit groove, lightly screwing the axial positioning assembly near the first end, detecting by using a feeler gauge, selecting one side, away from the opening, of the axial positioning assembly near the first end as a detection point, ensuring that the gap between the outer circle of the metal sealing ring at the detection point and the outer circumferential surface of the limit groove meets the requirement of 0.02max, and ensuring that the gap between the bottom surface of the metal sealing ring and the bottom surface of the limit groove meets the requirement of 0.02 max;
the radial positioning assembly is tightly screwed with force so as to radially limit the first end of the metal sealing ring;
the rest of the axial positioning components are screwed down so as to axially limit the whole metal sealing ring.
Further, prior to roughing the first end of the metal seal ring, the second end of the metal seal ring needs to be lifted and lightly pressed with an axial positioning assembly near the second end.
Further, during the finishing of the groove of the hook-shaped opening, the machining process is suspended, and the boss of the hook-shaped opening is pressed by the axial positioning component with the pointed pressing plate at the opening.
The invention has the following effects:
according to the positioning milling fixture, the limiting groove is formed in the bottom plate and used for placing the metal sealing ring to be machined, then the angular positioning chock, the axial positioning assembly and the radial positioning assembly are used for respectively positioning the metal sealing ring in the angular direction, the axial direction and the radial direction, the metal sealing ring is in a three-dimensional positioning state in the limiting groove, the position of the angular positioning groove is obtained by carrying out predeformation conversion on the basis of the diameter in the free state and the diameter in the working state and combining the design drawing size of the opening, the position corresponds to the position of the hook-shaped opening end of the metal sealing ring in the working state, the number milling machining of the hook-shaped opening in the working state of the metal sealing ring is simulated, the problem that the dimension is out of tolerance due to the fact that the horn mouth is formed when the existing metal sealing ring is placed in the measuring ring after the metal sealing ring is machined in the free state is solved, and the dimension of the metal sealing ring machined in the free state can accurately reach the dimension requirement in the working state.
In addition, the numerical milling processing method of the metal sealing ring of the power turbine casing comprises the steps of firstly carrying out angular positioning on the first end of the opening by utilizing the angular positioning plug block, then carrying out radial positioning by utilizing the radial positioning assembly and carrying out axial positioning by utilizing the axial positioning assembly, taking the size requirement of hook-shaped opening processing into consideration, and taking the angular positioning into consideration, wherein the precision adjustment margin is minimum, so that the angular positioning is carried out firstly, the angular positioning precision is ensured preferentially, and the precision adjustment margin of the axial positioning is relatively loose, so that the axial positioning is carried out after the angular positioning and the radial positioning, and the integral three-dimensional positioning precision can be ensured to meet the requirement. The position of the angular positioning is obtained by pre-deformation conversion based on the diameter in the free state and the diameter in the working state and combining with the size of a design drawing at the opening, and the position corresponds to the position of the hook-shaped opening end part of the metal sealing ring in the working state, so that the working state of the metal sealing ring is simulated to carry out a plurality of milling processes on the hook-shaped opening, the problem that the size of the existing metal sealing ring is out of tolerance due to the existence of a bell mouth when the existing metal sealing ring is placed into a measuring ring after being processed in the free state is solved, and the processed size of the metal sealing ring in the free state can accurately reach the size requirement in the working state.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention 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 invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic structural view of a power turbine case metal seal ring.
FIG. 2 is a plan view of the main profile dimensions of the hook-type opening of the metal seal ring of the power turbine casing.
Fig. 3 is a schematic diagram of a power turbine casing metal seal ring with a hook-shaped opening for a number milling operation.
Fig. 4 is a schematic top view of a positioning counter milling fixture according to a preferred embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view of a positioning numerical milling jig according to a preferred embodiment of the present invention.
FIG. 6 is a schematic view of a partial structure of a preferred embodiment of the present invention for positioning a metal seal ring by means of an angular positioning plug, an axial positioning assembly and a radial positioning assembly.
Fig. 7 is a schematic diagram of a method for performing clamping processing on a metal sealing ring in a numerical milling processing method of a metal sealing ring of a power turbine casing according to another embodiment of the invention.
Description of the reference numerals
1. A bottom plate; 2. an axial positioning assembly; 3. a radial positioning assembly; 4. angular positioning chock; 11. a limit groove; 12. an angular positioning groove; 21. a pressing plate; 22. a bushing; 23. bushing mounting screws; 24. a pressing plate locking screw; 25. a flat gasket; 31. a slide block; 32. a trough block; 33. mounting screws on the groove blocks; 34. knurled screws; 35. and (3) a spring.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawing figures, but the invention can be practiced in a number of different ways, as defined and covered below.
As shown in fig. 4 to 6, a positioning and milling fixture is provided in a preferred embodiment of the present invention, including a base plate 1, an axial positioning component 2, a radial positioning component 3 and an angular positioning plug 4, where the axial positioning component 2, the radial positioning component 3 and the angular positioning plug 4 are all installed on the base plate 1, a limiting groove 11 is formed on the base plate 1 and used for placing a metal sealing ring to be processed, the axial positioning component 2 is used for axially positioning the metal sealing ring, the radial positioning component 3 is used for radially positioning the metal sealing ring, an angular positioning groove 12 is formed on the base plate 1, the position of the angular positioning groove 12 corresponds to the hook-shaped opening end position of the metal sealing ring in a working state, and based on the diameter of the metal sealing ring in a free state and the diameter of the metal sealing ring in the working state, the angular positioning plug 4 is inserted into the angular positioning groove 12 to perform angular positioning on the metal sealing ring during processing.
It can be understood that, in the positioning milling fixture of this embodiment, the limiting groove 11 is formed on the bottom plate 1 for placing the metal sealing ring to be processed, then the angular positioning chock 4, the axial positioning assembly 2 and the radial positioning assembly 3 are used for respectively positioning the metal sealing ring in the angular direction, the axial direction and the radial direction, so that the metal sealing ring is ensured to be in a three-dimensional positioning state in the limiting groove 11, the position of the angular positioning groove 12 is obtained by pre-deforming and converting based on the diameter in the free state and the diameter in the working state and combining with the design dimension of the opening, and the position corresponds to the position of the end part of the hook-shaped opening of the metal sealing ring in the working state, so that the problem that the dimension is out of tolerance due to the existence of a horn mouth when the existing metal sealing ring is placed in the measuring ring after being processed in the free state is solved, and the dimension of the metal sealing ring processed in the free state can be ensured to accurately reach the dimension requirement in the working state.
It can be understood that the angular positioning plug 4 is locked on the bottom plate 1 through a screw, when the processing is needed, the screw is loosened to take off the angular positioning plug 4, the angular positioning plug 4 is inserted into the angular positioning groove 12 on the bottom plate 1, and the angular positioning plug 4 is locked on the bottom plate 1 by the screw after the processing is finished, so that the loss of the angular positioning plug 4 is prevented. An annular limiting groove 11 is formed in the upper surface of the bottom plate 1, the size of the limiting groove 11 is slightly larger than that of the metal sealing ring, and the metal sealing ring is placed in the limiting groove 11 after being opened. When designing the position of the angular positioning groove 12 on the base plate 1, the angular displacement conversion is performed by the formula l=2pi r based on the diameter size of the metal seal ring in the free state and the diameter size in the working state, and the angular displacement positioning value, which is the angular displacement amount of the metal seal ring in the free state and the working state, can be calculated by adding half of the part-opening-position-overlapping part in the design drawing requirement as the displacement amount, or the angular displacement amount between the angular positioning surface and the center surface of the clamp can be represented. And then numerical control programming is adopted to start feeding from the center surface of the clamp for milling, so that the machining size of the part in a free state can be realized, and the size requirement in a working state can be accurately met.
Optionally, the number of the axial positioning assemblies 2 is multiple, and the axial positioning assemblies 2 are distributed on the bottom plate 1 at intervals, so that a metal sealing ring can be uniformly and axially pressed. The axial positioning assembly 2 comprises a pressing plate 21, a bushing 22, a bushing mounting screw 23, a pressing plate locking screw 24 and a flat washer 25, wherein the bushing 22 is fixedly mounted on the bottom plate 1 through the bushing mounting screw 23, the upper end face of the bushing 22 is flush with the upper end face of the bottom plate 1, the pressing plate 21 is located above the bushing 22, a slotted hole is formed in the pressing plate 21, the flat washer 25 is located between the pressing plate locking screw 24 and the pressing plate 21, and the pressing plate locking screw 24 is matched with the bushing 22 and locked on the pressing plate 21 after penetrating through the slotted hole. When the axial positioning assembly 2 is installed, the bushing 22 is firstly installed in the step hole of the bottom plate 1 and locked by the bushing installation screw 23, then the pressing plate 21 and the flat washer 25 are sequentially placed, the pressing plate locking screw 24 sequentially penetrates through the flat washer 25 and the slotted hole on the pressing plate 21 and then is matched with the bushing 22, and the pressing plate locking screw 24 is locked on the pressing plate 21 so as to axially compress the metal sealing ring by the pressing plate 21. When the orientation of the pressing plate 21 is adjusted or required to be adjusted after the machining is completed, the orientation adjustment or disassembly of the pressing plate 21 can be performed by loosening the pressing plate locking screw 24, and the operation is very convenient. In addition, the pressing plate 21 at the opening of the metal sealing ring is a pointed pressing plate for pressing the boss of the hook-shaped opening when finishing the groove of the hook-shaped opening, thereby ensuring that the size of the groove of the hook-shaped opening (i.e., the size at (2) in fig. 3) meets the requirements. It can be understood that, because the thickness of the metal sealing ring at the groove of the hook-shaped opening is very thin, the target size is only 1.26mm, and the elasticity of the metal sealing ring is relatively large, when a plurality of milling processes are performed at present, the size is often not in accordance with the requirement because the hook-shaped opening of the metal sealing ring deforms in the processing process, and when the groove of the hook-shaped opening is finished, the lug boss of the hook-shaped opening is pressed by the pointed pressing plate, so that the deformation of the hook-shaped opening is limited, the processing precision is ensured, the target size can be met, more importantly, the requirement of 0.03max of thickness difference can be met, and the consistency of batch production and processing is ensured. Preferably, the positioning milling fixture comprises six axial limiting assemblies 2, wherein one axial limiting assembly 2 is located at the opening, a pressing plate 21 of the positioning milling fixture is a pointed pressing plate, one axial limiting assembly 2 is located near the first end of the opening and is used for axially compressing the first end of the opening, one axial limiting assembly 2 is located near the second end of the opening and is used for axially compressing the second end of the opening, and the remaining three axial limiting assemblies 2 are uniformly distributed, namely, the three axial limiting assemblies 2 are mutually distributed at intervals of 120 degrees. It can be understood that by adopting the layout mode, the axial limiting assembly 2 not only can play a role in uniformly and axially compacting the whole metal sealing ring, but also can axially limit the first end of the opening through the axial limiting assembly 2 near the first end of the opening, ensure the axial positioning reliability when the first end of the opening is subjected to a number of milling processes, ensure the axial positioning reliability when the second end of the opening is subjected to a number of milling processes through the axial limiting assembly 2 near the second end of the opening, and limit the deformation of the hook-shaped opening when the groove of the hook-shaped opening is subjected to a finish process through the axial limiting assembly 2 with a pointed pressing plate at the opening, thereby ensuring the processing precision.
Specifically, the radial positioning component 3 is located in the surrounding space of the limit groove 11, that is, the radial positioning component 3 is located in the annular space of the limit groove 11, and includes a sliding block 31, a groove block 32, a groove block mounting screw 33, a knurling screw 34 and a spring 35, the groove block 32 is fixedly mounted on the bottom plate 1 through the groove block mounting screw 33, a radially arranged sliding groove is formed in the groove block 32, that is, the opening direction of the sliding groove is arranged along the radial direction of the metal sealing ring, the sliding block 31 is arranged in the sliding groove and can slide back and forth along the sliding groove, the knurling screw 34 is rotatably mounted on the groove block 32, one end of the knurling screw 34 penetrates through the groove block 32 and stretches into the sliding groove to be matched with the sliding block 31, the spring 35 is sleeved on one end of the knurling screw 34 stretching into the groove block 32, and the knurling screw 34 is pushed to slide along the radial direction by rotating. When the radial positioning assembly 3 is installed, the groove block 32 is fixed on the bottom plate 1 through the groove block mounting screw 33, the sliding block 31 is placed in the sliding groove of the groove block 32, the spring 35 is respectively connected with the sliding groove inner walls of the sliding block 31 and the groove block 32, and the knurled screw 34 is installed on the groove block 32, so that one end of the knurled screw 34 penetrates through the groove block 32 and then stretches into the sliding groove to be matched with the sliding block 31 through the spring 35, and the matching is similar to that of a screw nut. When the opening of the metal sealing ring is required to be radially limited, the knurled screw 34 is rotated to drive the sliding block 31 to slide along the radial direction, so that the head of the sliding block 31 is abutted against the inner circumferential surface of the metal sealing ring along the radial direction, and the metal sealing ring is pressed on the outer circumferential surface of the limiting groove 11. When radial limiting is no longer needed, the knurled screw 34 is reversely rotated to drive the sliding block 31 to reversely slide, and the radial limiting effect can be relieved.
Optionally, a slot hole is formed in the slider 31 at a position corresponding to the slot block mounting screw 33, the slot block mounting screw 33 passes through the slot hole and the slot block 32 and is fixed on the bottom plate 1, and the sliding travel of the slider 31 is limited by the slot block mounting screw 33, so as to prevent the slider 31 from falling out of the slot block 32.
In addition, another embodiment of the present invention also provides a method for milling a metal seal ring of a power turbine casing, preferably using the positioning milling fixture as described above, including the following steps:
mounting a positioning number milling fixture on a processing machine tool;
inserting the angular positioning plug 4 into the angular positioning groove 12;
placing a metal sealing ring with an opening into the limit groove 11, and enabling a first end of the opening of the metal sealing ring to lean against the angular positioning plug block 4;
the radial positioning assembly 3 and the axial positioning assembly 2 are utilized to radially position and axially position the metal sealing ring;
milling the first end of the metal sealing ring;
and loosening the radial positioning assembly 3 and the axial positioning assembly 2, abutting the second end of the opening of the metal sealing ring on the angular positioning plug block 4, repeating the above steps, and performing numerical milling on the second end of the opening of the metal sealing ring.
It can be understood that in the numerical milling machining method of the metal sealing ring of the power turbine casing of the embodiment, the angular positioning plug 4 is utilized to perform angular positioning on the first end of the opening, then the radial positioning assembly 3 is utilized to perform radial positioning and the axial positioning assembly 2 is utilized to perform axial positioning, the angular positioning is the most important in consideration of the size requirement of hook-shaped opening machining, the precision adjustment margin is the minimum, so that the angular positioning is performed first, the angular positioning precision is ensured preferentially, the precision adjustment margin of the axial positioning is relatively loose, and the axial positioning is performed after the angular positioning and the radial positioning are performed, so that the integral three-dimensional positioning precision can be ensured to meet the requirement. The position of the angular positioning is obtained by pre-deformation conversion based on the diameter in the free state and the diameter in the working state and combining with the size of a design drawing at the opening, and the position corresponds to the position of the hook-shaped opening end part of the metal sealing ring in the working state, so that the working state of the metal sealing ring is simulated to carry out a plurality of milling processes on the hook-shaped opening, the problem that the size of the existing metal sealing ring is out of tolerance due to the existence of a bell mouth when the existing metal sealing ring is placed into a measuring ring after being processed in the free state is solved, and the processed size of the metal sealing ring in the free state can accurately reach the size requirement in the working state.
It can be understood that the specific processing procedure is as follows:
after the positioning number milling fixture is mounted on the number milling machine, the runout of the fixture positioning surface needs to be checked, and the fixture positioning surface is ensured to runout by 0.02max, so that the mounting accuracy of the fixture is ensured.
Then, the screw on the angular positioning block 4 is loosened, the angular positioning block 4 is removed, and then it is inserted into the angular positioning groove 12 on the base plate 1.
Then, the metal sealing ring with the opening is placed into the limit groove 11 of the bottom plate 1, so that the first end of the opening of the metal sealing ring is abutted against the angular positioning plug 4.
After the outer circumference of the metal sealing ring is tightly attached to the outer circumference of the limit groove 11, the outer circumference of the limit groove 11 is a radial positioning surface of the part, the axial positioning assembly 2 near the first end, namely the assembly B in fig. 7, is lightly screwed, a feeler gauge is used for detection, one side, away from the opening, of the axial positioning assembly 2 near the first end is selected as a detection point, namely the position A in fig. 7, a gap between the outer circumference of the metal sealing ring at the detection point and the outer circumference of the limit groove 11 is ensured to meet the requirement of 0.02max, and a gap between the bottom surface of the metal sealing ring and the bottom surface of the limit groove 11 is met the requirement of 0.02max, and the bottom surface of the limit groove 11 is a part supporting surface. The radial positioning assembly 3 (i.e. the assembly C in fig. 7) is then screwed down forcibly, that is, the knurled screw 34 is turned to drive the slider 31 to slide, so that the head of the slider 31 abuts against the inner circumferential surface of the first end of the metal seal ring in the radial direction, and the first end of the metal seal ring is limited in the radial direction. The rest of the axial positioning assemblies 2 are screwed, namely three axial positioning assemblies 2 which are distributed at 120 degrees from each other are screwed, so that the whole metal sealing ring is uniformly and axially limited. The radial limiting assembly 3 and the axial limiting assembly 2 are used for carrying out radial limiting and axial limiting on the metal sealing ring after angular positioning, so that the axial gap and the radial gap of the metal sealing ring are ensured to be in the best positioning state before numerical milling.
Then, rough and finish milling is performed on the first end of the metal seal ring opening.
Finally, after the first end of the opening of the metal sealing ring is subjected to hook-shaped opening processing, the radial positioning assembly 3 and the axial positioning assembly 2 are loosened, the second end of the opening of the metal sealing ring is abutted against the angular positioning plug 4, and after the outer circle of the metal sealing ring is abutted against the outer circumferential surface of the limit groove 11, the axial positioning assembly 2 near the second end, namely the assembly E in fig. 7, is lightly screwed. After the clearance meets the requirements through the measurement of the feeler gauge, the radial limiting and the axial limiting are carried out through the radial positioning assembly 3 and the axial positioning assembly 2, and finally rough milling and fine milling are carried out on the second end of the metal sealing ring opening.
Optionally, before the first end of the metal seal ring is roughed, the second end of the metal seal ring needs to be lifted and lightly pressed by the axial positioning assembly 2 near the second end to prevent the open second end of the metal seal ring from being damaged during the process of machining the first end. Likewise, the first end of the metal seal ring also needs to be lifted and lightly pressed with the axial positioning assembly 2 near the first end before the second end of the metal seal ring is roughed.
Optionally, when finish machining is performed on the groove of the hook-shaped opening, the machining program needs to be suspended, and the axial positioning assembly 2 (namely, the assembly D in fig. 7) with the pointed pressing plate at the opening is utilized to press the boss of the hook-shaped opening, so that deformation of the hook-shaped opening is limited, machining precision is ensured, the requirement of meeting the target size is met, more importantly, the requirement of 0.03max of thickness difference is met, and consistency of mass production and machining is ensured.
It can be understood that the numerical milling processing method of the metal sealing ring of the power turbine casing has stable processing quality, the qualification rate of parts is 100%, the processing efficiency is improved by 120% compared with the existing processing method, the yield of the metal sealing ring is greatly improved, and the annual yield can be realized by more than 1500.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. The positioning milling fixture is characterized by comprising a bottom plate (1), an axial positioning assembly (2), a radial positioning assembly (3) and an angular positioning plug block (4), wherein the axial positioning assembly (2), the radial positioning assembly (3) and the angular positioning plug block (4) are all arranged on the bottom plate (1), a limiting groove (11) is formed in the bottom plate (1) and is used for placing a metal sealing ring to be processed, the axial positioning assembly (2) is used for axially positioning the metal sealing ring, the radial positioning assembly (3) is used for radially positioning the metal sealing ring, the bottom plate (1) is provided with an angular positioning groove (12), the position of the angular positioning groove (12) corresponds to the position of a hook-shaped opening end part of the metal sealing ring in a working state, the angular positioning plug block (4) is obtained by pre-deformation conversion based on the diameter of the metal sealing ring in a free state and the diameter of the metal sealing ring in the working state, and the angular positioning plug block (4) is inserted into the angular positioning groove (12) to perform angular positioning on the metal sealing ring in the working state during processing; when the position of the angular positioning groove (12) on the bottom plate (1) is designed, carrying out angular offset conversion according to a formula L=2pi r based on the diameter size of the metal sealing ring in a free state and the diameter size of the metal sealing ring in an operating state, and calculating an angular offset positioning value by taking half of a part-opening-position lifting part in a design drawing requirement as an offset, wherein the angular offset positioning value is the angular offset between an angular positioning surface and a clamp center surface;
radial locating component (3) are located in the surrounding space of spacing groove (11), including slider (31), groove block (32), groove block mounting screw (33), knurling screw (34) and spring (35), groove block (32) pass through groove block mounting screw (33) fixed mounting on bottom plate (1), set up the spout that radially sets up on groove block (32), slider (31) set up in the spout and can follow the spout and make a round trip to slide, knurling screw (34) rotationally install on groove block (32), its one end pass groove block (32) and stretch into in the spout with slider (31) cooperation, the one end and slider (31) fixed connection of spring (35), the other end and groove block (32) cell wall fixed connection through rotating knurling screw (34) are promoted slider (31) are along radial direction slip, corresponding on slider (31) the position department of groove block mounting (33) has been seted up, groove block mounting screw (33) pass groove block (32) and pass behind groove block (32) and stretch into in the spout with slider (31) cooperation, the one end and groove block (33) pass through fixed groove hole (33) and carry out spacing screw (1).
2. Positioning counter-milling clamp according to claim 1, characterized in that the number of axial positioning assemblies (2) is plural, and that a plurality of axial positioning assemblies (2) are distributed on the base plate (1) at intervals.
3. The positioning milling fixture as claimed in claim 2, wherein the axial positioning assembly (2) comprises a pressing plate (21), a bushing (22), a bushing mounting screw (23), a pressing plate locking screw (24) and a flat washer (25), wherein the bushing (22) is fixedly mounted on the bottom plate (1) through the bushing mounting screw (23), the upper end surface of the bushing (22) is flush with the upper end surface of the bottom plate (1), the pressing plate (21) is positioned above the bushing (22), a slotted hole is formed in the pressing plate (21), the flat washer (25) is positioned between the pressing plate locking screw (24) and the pressing plate (21), and the pressing plate locking screw (24) is matched with the bushing (22) and locked on the pressing plate (21) after passing through the slotted hole.
4. A positioning counter-milling fixture according to claim 3, characterized in that the pressure plate (21) at the opening of the metal sealing ring is a pointed pressure plate for pressing against the boss of the hook opening when finishing the groove of the hook opening.
5. A method for milling a metal sealing ring of a power turbine casing by adopting the positioning numerical milling fixture as set forth in any one of claims 1 to 4, which is characterized by comprising the following steps:
mounting a positioning number milling fixture on a processing machine tool;
inserting the angular positioning plug block (4) into the angular positioning groove (12);
placing a metal sealing ring with an opening into a limiting groove (11) so that a first end of the opening of the metal sealing ring is abutted against the angular positioning plug block (4);
radial positioning and axial positioning are carried out on the metal sealing ring by utilizing a radial positioning assembly (3) and an axial positioning assembly (2);
milling the first end of the metal sealing ring;
and loosening the radial positioning assembly (3) and the axial positioning assembly (2), abutting the second end of the opening of the metal sealing ring on the angular positioning plug block (4), repeating the above steps, and performing numerical milling on the second end of the opening of the metal sealing ring.
6. The method for milling the metal sealing ring of the power turbine casing according to claim 5, wherein the radial positioning and axial positioning of the metal sealing ring by using the radial positioning assembly (3) and the rest of the axial positioning assembly (2) is specifically:
firstly, tightly attaching the outer circle of the metal sealing ring to the outer circumferential surface of the limit groove (11), lightly screwing the axial positioning assembly (2) near the first end, detecting by using a feeler gauge, selecting one side, far away from the opening, of the axial positioning assembly (2) near the first end as a detection point, ensuring that the gap between the outer circle of the metal sealing ring at the detection point and the outer circumferential surface of the limit groove (11) meets the requirement of 0.02max, and ensuring that the gap between the bottom surface of the metal sealing ring and the bottom surface of the limit groove (11) meets the requirement of 0.02 max;
the radial positioning assembly (3) is tightly screwed with force so as to radially limit the first end of the metal sealing ring;
the rest of the axial positioning assembly (2) is screwed to axially limit the whole metal sealing ring.
7. A method of milling a metal seal ring of a power turbine casing according to claim 5, characterized in that the second end of the metal seal ring is lifted and lightly pressed with an axial positioning assembly (2) in the vicinity of the second end before the first end of the metal seal ring is roughed.
8. The method for milling the metal seal ring of the power turbine casing according to claim 5, wherein the machining process is suspended when the groove of the hook-shaped opening is finished, and the boss of the hook-shaped opening is pressed by the axial positioning component (2) with the pointed pressing plate at the opening.
CN202210439909.1A 2022-04-25 2022-04-25 Positioning numerical milling fixture and numerical milling processing method for metal sealing ring of power turbine casing Active CN114700537B (en)

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CN207577943U (en) * 2017-12-15 2018-07-06 哈尔滨汽轮机厂有限责任公司 A kind of processing elastic sealing ring etc. divides groove special fixture
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