CN114700537A - Positioning numerical milling fixture and numerical milling machining method for metal sealing ring of power turbine casing - Google Patents
Positioning numerical milling fixture and numerical milling machining method for metal sealing ring of power turbine casing Download PDFInfo
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- CN114700537A CN114700537A CN202210439909.1A CN202210439909A CN114700537A CN 114700537 A CN114700537 A CN 114700537A CN 202210439909 A CN202210439909 A CN 202210439909A CN 114700537 A CN114700537 A CN 114700537A
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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
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- 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
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- 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
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- 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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Abstract
The invention discloses a positioning numerical milling fixture and a numerical milling method for a metal sealing ring of a power turbine casing, wherein the positioning numerical milling fixture is used for placing the metal sealing ring to be processed by arranging a limiting groove on a bottom plate, angular, axial and radial positioning is respectively carried out on the metal sealing ring by utilizing an angular positioning chock, an axial positioning assembly and a radial positioning assembly, the angular positioning groove is obtained by carrying out predeformation conversion on the diameter of a free state and the diameter of a working state by combining with the size of a design drawing at an opening, and the angular positioning chock, the axial positioning assembly and the radial positioning assembly correspond to the end part position of a hook-shaped opening of the metal sealing ring in the working state.
Description
Technical Field
The invention relates to the technical field of machining of metal sealing rings of power turbine casings, in particular to a positioning numerical milling fixture, and in addition, in particular to a numerical milling machining method of the metal sealing rings of the power turbine casings by adopting the positioning numerical milling fixture.
Background
As shown in FIG. 1, the metal sealing ring of the power turbine casing is a thin-wall annular opening part and plays a role in sealing in the engine, and the service life of the engine is directly influenced by the performance of the metal sealing ring. At present, when a hook-shaped opening for processing a metal sealing ring of a power turbine casing is subjected to milling, because parts are processed in a free state and are put into a measuring ring to simulate a working state for detection after the processing is finished, the size change difference of the hook-shaped opening is large, the processing size of the parts is unqualified, and the rejection rate and the repair rate of the parts are high. Specifically, as shown in fig. 2 and 3, the profile size requirement at the hook-shaped opening is specifically: (1) amplification at E in the quantum ring: axial gaps of 0-0.05 are arranged at the position 2, the radial size of the position 2 is 3.05-3.30, and the thickness difference is 0.02; (2) and in the quantum ring, A is visually amplified: the size of the opening at the position 2 is 4.75-5.15, the radial clearance is 0-0.05, the thickness of the molded surface at the position 2 is 1.07-1.21, when the surfaces D are in contact, the surfaces B and C are checked by surface beating, and the surface C is allowed to be lower than the surface B by 0.025 max. When the measuring ring is put in for detection after being processed in a free state, the milling processing sizes of the opening part are firstly, secondly and thirdly not capable of meeting the requirements of drawings, and the sizes are secondly, thirdly and fifthly required to be repaired for a plurality of times after being processed so as to meet the requirements of the drawings.
Disclosure of Invention
The invention provides a positioning numerical milling clamp and a numerical milling method for a metal sealing ring of a power turbine casing, and aims to solve the technical problem that the machining size is not qualified when a hook-shaped opening of the metal sealing ring of the power turbine casing is subjected to numerical milling in a free state.
According to one aspect of the invention, a positioning numerical milling fixture is provided, which comprises a bottom plate, an axial positioning assembly, a radial positioning assembly and an angular positioning chock block, the axial positioning component, the radial positioning component and the angular positioning chock are all arranged on the bottom plate, a limiting groove is arranged on the bottom plate, used for placing a metal sealing ring to be processed, the axial positioning component is used for axially positioning the metal sealing ring, the radial positioning component is used for radially positioning the metal sealing ring, the bottom plate is provided with an angular positioning groove, the position of the angular positioning groove corresponds to the position of the end part of the hook-shaped opening of the metal sealing ring in the working state, and the angular positioning groove is obtained by pre-deformation conversion based on the diameter of the metal sealing ring in the free state and the diameter of the metal sealing ring in the working state, when the metal sealing ring machining device is used for machining, the angular positioning chock is inserted into the angular positioning groove to angularly position the metal sealing ring.
Furthermore, the number of the axial positioning assemblies is multiple, and the multiple axial positioning assemblies are distributed on the bottom plate at intervals.
Furthermore, the axial positioning assembly comprises a pressing plate, a bushing mounting screw, a pressing plate locking screw and a flat washer, 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 penetrates through the slotted hole to be matched with the bushing and locked on the pressing plate.
Furthermore, the pressing plate positioned 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.
Furthermore, the radial positioning component is located in the enclosed space of the limiting groove and comprises a sliding block, a groove block mounting screw, a knurled screw and a spring, the groove block is fixedly mounted on the bottom plate through the groove block mounting screw, a radially arranged sliding groove 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 knurled screw is rotatably mounted on the groove block, one end of the knurled screw penetrates through the groove block and extends 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 knurled screw is rotated to push the sliding block to slide along the radial direction.
Furthermore, a slotted hole is formed in the position, corresponding to the slotted block mounting screw, of the sliding block, the slotted 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 block mounting screw.
In addition, the invention also provides a numerical milling processing method of the metal sealing ring of the power turbine casing, which adopts the positioning numerical milling fixture and comprises the following contents:
mounting a positioning numerical milling fixture on a processing machine tool;
inserting the angular positioning chock into the angular positioning groove;
placing a metal sealing ring with an opening into the limiting groove, and enabling a first end of the opening of the metal sealing ring to lean against the angular positioning chock;
the metal sealing ring is radially positioned and axially positioned by utilizing the radial positioning assembly and the axial positioning assembly;
performing milling on the first end of the metal sealing ring;
and loosening the radial positioning assembly and the axial positioning assembly, enabling the second end at the opening of the metal sealing ring to be tightly leaned on the angular positioning chock block, repeating the above steps, and performing the milling machining on the second end at the opening of the metal sealing ring.
Further, the process of radially positioning and axially positioning the metal seal ring by using the radial positioning assembly and the other axial positioning assemblies specifically comprises:
firstly, tightly attaching the outer circle of the metal sealing ring to the outer circle surface of the limiting 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, and ensuring that the gap between the outer circle of the metal sealing ring and the outer circle surface of the limiting groove at the detection point meets the requirement of 0.02max and the gap between the bottom surface of the metal sealing ring and the bottom surface of the limiting groove meets the requirement of 0.02 max;
screwing the radial positioning assembly forcibly to limit the first end of the metal sealing ring in the radial direction;
and screwing the rest axial positioning assemblies to axially limit the whole metal sealing ring.
Further, before 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 component near the second end.
Further, when the groove of the hook-shaped opening is finely processed, the processing procedure is suspended, and the axial positioning component with the pointed pressing plate at the opening is used for pressing the boss of the hook-shaped opening.
The invention has the following effects:
the positioning numerical milling fixture of the invention is characterized in that a limiting groove is arranged on the bottom plate for placing the metal sealing ring to be processed, then angular, axial and radial positioning are respectively carried out on the metal sealing ring by utilizing the angular positioning chock block, the axial positioning component and the radial positioning component to ensure that the metal sealing ring is in a three-dimensional positioning state in the limiting groove, and the position of the angular positioning groove is obtained by pre-deformation conversion based on the diameter in the free state and the diameter in the working state and the design drawing size at the opening, what it corresponds is that metallic seal ring's hook type opening tip position under operating condition has simulated metallic seal ring operating condition and has carried out the line milling processing to the hook type opening, has solved current metallic seal ring and has put into the measuring ring and cause the problem that the size is out of tolerance because of appearing the horn mouth after processing under free state, guarantees that the size of metallic seal ring processing under free state can accurately reach the dimensional requirement under the operating condition.
In addition, the numerical milling method for 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 using the angular positioning chock, then carrying out radial positioning by using the radial positioning assembly and carrying out axial positioning by using the axial positioning assembly, considering the size requirement of hook-shaped opening processing, the angular positioning is the most important, and the precision adjusting margin is the smallest, so that the angular positioning is carried out firstly, the angular positioning precision is preferentially ensured, and the precision adjusting margin of the axial positioning is relatively loose, so that the axial positioning is carried out after the angular positioning and the radial positioning are carried out, and the integral three-dimensional positioning precision can meet the requirement. The angular positioning position is obtained by performing pre-deformation conversion on the basis of the diameter in the free state and the diameter in the working state and the size of a design drawing at the opening, and the position of the end part of the hook-shaped opening of the metal sealing ring in the working state is correspondingly simulated, so that the problem that the size of the existing metal sealing ring is out of tolerance due to the fact that the existing metal sealing ring is placed into the measuring ring after being processed in the free state because of the horn mouth is solved, and the size of the metal sealing ring processed in the free state can accurately meet the size requirement in the working state.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a metal seal ring of a power turbine casing.
FIG. 2 is a schematic representation of the principal profile dimensions at the hook opening of a metal seal ring for a power turbine case.
FIG. 3 is a schematic view of a numerical milling process for a hook-shaped opening of a metal seal ring of a power turbine case.
Fig. 4 is a schematic top view of a positioning numerical milling fixture according to a preferred embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view of a positioning numerical milling fixture according to a preferred embodiment of the present invention.
FIG. 6 is a partial schematic structural view of a preferred embodiment of the present invention illustrating the positioning of a metal seal ring by an angular positioning plug, an axial positioning assembly and a radial positioning assembly.
FIG. 7 is a schematic view illustrating a clamping process of a metal seal ring of a power turbine casing according to another embodiment of the present invention.
Description of the reference numerals
1. A base plate; 2. an axial positioning assembly; 3. a radial positioning assembly; 4. an angular positioning chock; 11. a limiting groove; 12. angular positioning grooves; 21. pressing a plate; 22. a bushing; 23. a bushing mounting screw; 24. a screw is locked by the pressure plate; 25. a flat washer; 31. a slider; 32. a groove block; 33. mounting screws on the groove blocks; 34. knurling screws; 35. a spring.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
As shown in fig. 4 to 6, a preferred embodiment of the present invention provides a positioning numerical milling fixture, which includes a bottom plate 1, an axial positioning assembly 2, a radial positioning assembly 3, and an angular positioning chock 4, wherein the axial positioning assembly 2, the radial positioning assembly 3, and the angular positioning chock 4 are all mounted on the bottom plate 1, the bottom plate 1 is provided with a limiting groove 11 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 angular positioning groove 12 corresponds to a hook-shaped opening end position of the metal sealing ring in a working state, and is obtained by performing pre-deformation conversion based on a diameter of the metal sealing ring in a free state and a diameter of the metal sealing ring in the working state, when machining is carried out, the angular positioning chock 4 is inserted into the angular positioning groove 12 to angularly position the metal sealing ring.
It can be understood that, in the positioning numerical milling fixture of the 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 component 2 and the radial positioning component 3 are utilized to perform angular, axial and radial positioning on the metal sealing ring respectively, so as to ensure that the metal sealing ring is in a three-dimensional positioning state in the limiting groove 11, the position of the angular positioning groove 12 is obtained by performing pre-deformation conversion based on the diameter in a free state and the diameter in a working state and combining the size of a design drawing at an opening, and correspondingly, the position of the end part of the hook-shaped opening of the metal sealing ring in the working state simulates the numerical milling processing of the hook-shaped opening by the working state of the metal sealing ring, thereby solving the problem that the size of the existing metal sealing ring is out of tolerance due to the horn mouth in the measuring ring after being processed in the free state, the size of the metal sealing ring processed in the free state can accurately meet the size requirement in the working state.
It can be understood that the angular positioning chock 4 is locked on the bottom plate 1 through the screw, when needing to add man-hour, loosen the screw and take off the angular positioning chock 4, insert it in the angular positioning groove 12 on the bottom plate 1 can, reuse screw locking after processing is accomplished on the bottom plate 1, prevent that the angular positioning chock 4 from losing. 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 opening. When the position of the angular positioning groove 12 on the bottom plate 1 is designed, angular offset conversion is performed through a formula L of 2 pi 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 a working state, and in addition, half of a part, which is lifted up at the opening of a part in the requirement of a design drawing, is used as an offset, so that an angular offset positioning value can be calculated, the angular offset positioning value represents the angular offset existing in the processing of the metal sealing ring in the free state and the processing in the working state, and also can represent the angular offset between an angular positioning surface and a central surface of a clamp. And then numerical control programming is adopted to feed from the center plane of the clamp for carrying out the milling machining, so that the machining size of the part in a free state can accurately meet the size requirement in a working state.
Optionally, the number of the axial positioning assemblies 2 is multiple, and the plurality of axial positioning assemblies 2 are distributed on the bottom plate 1 at intervals, so that the metal sealing ring can be uniformly and axially compressed. The axial positioning component 2 comprises a pressing plate 21, a lining 22, a lining mounting screw 23, a pressing plate locking screw 24 and a flat washer 25, the lining 22 is fixedly mounted on the bottom plate 1 through the lining mounting screw 23, the upper end face of the lining 22 is flush with the upper end face of the bottom plate 1, the pressing plate 21 is located above the lining 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 lining 22 and locked on the pressing plate 21 after penetrating through the slotted hole. When the axial positioning assembly 2 is installed, firstly, the bushing 22 is installed in a step hole of the bottom plate 1 and is locked through 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 a groove hole in 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 carry out axial line compression on the metal sealing ring through the pressing plate 21. After the machining is finished or the position of the pressing plate 21 needs to be adjusted, the position of the pressing plate 21 can be adjusted or disassembled 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, which is used for pressing the boss of the hook-shaped opening when the groove of the hook-shaped opening is subjected to finish machining, so that the size of the groove of the hook-shaped opening (namely the size of the position II in fig. 3) can meet the requirement. 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 large, when the metal sealing ring is subjected to the numerical milling, the size is often not met due to the deformation of the hook-shaped opening of the metal sealing ring in the processing process, but the invention utilizes the pointed pressing plate to press the boss of the hook-shaped opening when the groove of the hook-shaped opening is subjected to the finish machining, so that the deformation of the hook-shaped opening is limited, the processing precision is ensured, the target size can be ensured, more importantly, the requirement of the thickness difference of 0.03max can be met, and the consistency of the batch production and processing is ensured. Preferably, the positioning numerical milling fixture comprises six axial limiting assemblies 2, wherein one axial limiting assembly 2 is located at the opening, the pressing plate 21 is a pointed pressing plate, one axial limiting assembly 2 is located near the first end of the opening and used for axially pressing the first end of the opening, one axial limiting assembly 2 is located near the second end of the opening and used for axially pressing the second end of the opening, and the remaining three axial limiting assemblies 2 are uniformly distributed, that is, the three axial limiting assemblies 2 are distributed at an interval of 120 degrees. It can be understood that the axial limiting component 2 of the invention not only can play a role of uniform axial compression on the whole metal sealing ring by adopting the layout mode, but also can axially limit the first end of the opening by the axial limiting component 2 positioned near the first end of the opening, thereby ensuring the axial positioning reliability when the first end of the opening is subjected to the milling machining, axially limit the second end of the opening by the axial limiting component 2 positioned near the second end of the opening, thereby ensuring the axial positioning reliability when the second end of the opening is subjected to the milling machining, press the boss of the hook-shaped opening when the groove of the hook-shaped opening is subjected to the finish machining by the axial limiting component 2 with the pointed pressing plate positioned at the opening, thereby limiting the deformation of the hook-shaped opening during the machining, and ensuring the machining precision.
Specifically, the radial positioning component 3 is located in the enclosed space of the limiting groove 11, that is, the radial positioning component 3 is located in the annular space of the limiting groove 11, which comprises a sliding block 31, a groove block 32, a groove block mounting screw 33, a knurled screw 34 and a spring 35, the groove block 32 is fixedly arranged on the bottom plate 1 through a groove block mounting screw 33, a sliding groove arranged in the radial direction is arranged on the groove block 32, namely, the opening direction of the chute is arranged along the radial direction of the metal sealing ring, the slide block 31 is arranged in the chute and can slide back and forth along the chute, the knurled screw 34 is rotatably arranged on the groove block 32, one end of the spring 35 penetrates through the groove block 32 and extends into the sliding groove to be matched with the sliding block 31, the knurled screw 34 is sleeved on one end extending into the groove block 32, and the sliding block 31 is pushed to slide along the radial direction by rotating the knurled screw 34. When the radial positioning component 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 connected with the sliding groove inner walls of the sliding block 31 and the groove block 32 respectively, 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 extends into the sliding groove and penetrates through the spring 35 to be matched with the sliding block 31, which is similar to the matching of a screw nut. When the opening of the metal sealing ring needs 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 abuts against the inner circumferential surface of the metal sealing ring along the radial direction, and the metal sealing ring is pressed against the outer circumferential surface of the limiting groove 11. When the radial limit is not needed any more, the knurled screw 34 is rotated reversely to drive the slide block 31 to slide reversely, so that the radial limit effect can be relieved.
Optionally, a slotted hole is formed in the position, corresponding to the slotted block mounting screw 33, of the sliding block 31, the slotted block mounting screw 33 is fixed on the bottom plate 1 after penetrating through the slotted hole and the slotted block 32, and the sliding stroke of the sliding block 31 is limited by the slotted block mounting screw 33, so that the sliding block 31 is prevented from being separated from the slotted block 32.
In addition, another embodiment of the present invention further provides a method for performing numerical milling on a metal seal ring of a power turbine casing, preferably using the positioning numerical milling fixture, including the following steps:
mounting a positioning numerical milling fixture on a processing machine tool;
inserting the angular positioning chock 4 into the angular positioning groove 12;
placing the metal sealing ring with the opening into the limiting groove 11, and enabling the first end at the opening of the metal sealing ring to be close to the angular positioning chock 4;
the metal sealing ring is radially positioned and axially positioned by utilizing the radial positioning component 3 and the axial positioning component 2;
performing milling on the first end of the metal sealing ring;
and loosening the radial positioning assembly 3 and the axial positioning assembly 2, enabling the second end at the opening of the metal sealing ring to be abutted against the angular positioning chock 4, repeating the above steps, and performing the milling machining on the second end at the opening of the metal sealing ring.
It can be understood that, in the numerical milling method for the metal sealing ring of the power turbine casing of the embodiment, the angular positioning chock 4 is firstly utilized to perform angular positioning on the first end of the opening, then the radial positioning component 3 performs radial positioning and the axial positioning component 2 performs axial positioning, the angular positioning is the most important and the precision adjustment margin is the minimum in consideration of the size requirement of hook-shaped opening processing, so that the angular positioning is performed firstly, the angular positioning precision is preferentially ensured, and the precision adjustment margin of the axial positioning is relatively loose, so that the axial positioning is performed after the angular positioning and the radial positioning are performed, and the requirement can be met by the integral three-dimensional positioning precision. The angular positioning position is obtained by performing pre-deformation conversion on the basis of the diameter in the free state and the diameter in the working state and the size of a design drawing at the opening, and the position of the end part of the hook-shaped opening of the metal sealing ring in the working state is correspondingly simulated, so that the problem that the size of the existing metal sealing ring is out of tolerance due to the fact that the existing metal sealing ring is placed into the measuring ring after being processed in the free state because of the horn mouth is solved, and the size of the metal sealing ring processed in the free state can accurately meet the size requirement in the working state.
It can be understood that the specific processing procedure is as follows:
after the positioning numerical milling fixture is installed on a numerical milling machine, the jumping of the positioning surface of the fixture needs to be checked, and the jumping of the positioning surface of the fixture is guaranteed to be 0.02max, so that the installation accuracy of the fixture is guaranteed.
The screws on the angular positioning blocks 4 will then be loosened, the angular positioning blocks 4 removed and then inserted into the angular positioning slots 12 on the base plate 1.
Then, the metal sealing ring with the opening is placed in the limiting groove 11 of the bottom plate 1, so that the first end of the opening of the metal sealing ring abuts against the angular positioning chock 4.
And after the outer circle of the metal sealing ring is tightly attached to the outer circle surface of the limiting groove 11, the outer circle surface of the limiting groove 11 is a part radial positioning surface, the axial positioning component 2 near the first end, namely the component B in the figure 7, is lightly screwed, the feeler gauge is used for detection, one side, away from the opening, of the axial positioning component 2 near the first end is selected as a detection point, namely the position A in the figure 7, so that the gap between the outer circle of the metal sealing ring and the outer circle surface of the limiting groove 11 at the detection point is ensured to meet the requirement of 0.02max, the gap between the bottom surface of the metal sealing ring and the bottom surface of the limiting groove 11 meets the requirement of 0.02max, and the bottom surface of the limiting groove 11 is a part supporting surface. The radial positioning component 3 (i.e., component C in fig. 7) is screwed tightly, that is, the knurled screw 34 is rotated to drive the sliding block 31 to slide, so that the head of the sliding block 31 radially abuts against the inner circumferential surface of the first end of the opening of the metal sealing ring, and the first end of the metal sealing ring is radially limited. The remaining axial positioning assemblies 2 are tightened, i.e. three axial positioning assemblies 2 distributed at 120 ° from each other are tightened to perform a uniform axial position limitation of the entire metal sealing ring. The metal sealing ring is radially limited and axially limited after being angularly positioned by the radial limiting assembly 3 and the axial limiting assembly 2, so that the axial gap and the radial gap of the metal sealing ring are ensured to be in the best positioning state before the numerical milling.
And then, carrying out rough and fine milling on the first end of the opening of the metal sealing ring.
Finally, after the first end of the opening of the metal sealing ring is processed by the hook-shaped opening, the radial positioning component 3 and the axial positioning component 2 are loosened, the second end of the opening of the metal sealing ring is abutted against the angular positioning chock 4, and after the outer circle of the metal sealing ring is abutted against the outer circumferential surface of the limiting groove 11, the axial positioning component 2 near the second end is screwed down lightly, namely, the component E in fig. 7. After clearance meeting the requirements is guaranteed through clearance gauge measurement, radial limiting and axial limiting are carried out through the radial positioning assembly 3 and the axial positioning assembly 2, and finally rough and fine milling machining is carried out on the second end of the opening of the metal sealing ring.
Optionally, before rough machining the first end of the metal seal ring, the second end of the metal seal ring needs to be lifted and lightly pressed by the axial positioning component 2 near the second end to prevent the second end of the metal seal ring opening from being damaged during machining the first end. Similarly, before roughing the second end of the metal seal ring, it is also necessary to lift the first end of the metal seal ring and lightly press it with the axial positioning assembly 2 near the first end.
Optionally, when the groove of the hook-shaped opening is subjected to fine machining, the machining program needs to be suspended, and the axial positioning component 2 (i.e., the component D in fig. 7) with the pointed pressing plate at the opening is used for pressing the boss of the hook-shaped opening, so that the deformation of the hook-shaped opening is limited, the machining precision is ensured, the target size can be ensured to be met, more importantly, the requirement of the thickness difference of 0.03max can be met, and the consistency of batch production and machining is ensured.
The numerical milling method for the metal sealing ring of the power turbine casing has the advantages that the processing quality is stable, the qualified 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 more than 1500.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The positioning numerical milling fixture is characterized by comprising a bottom plate (1), an axial positioning assembly (2), a radial positioning assembly (3) and an angular positioning chock block (4), wherein the axial positioning assembly (2), the radial positioning assembly (3) and the angular positioning chock block (4) are all installed on the bottom plate (1), a limiting groove (11) is formed in the bottom plate (1) and used for placing a metal sealing ring to be machined, 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, an angular positioning groove (12) is formed in the bottom plate (1), the position of the angular positioning groove (12) corresponds to the position of the end part of a hook-shaped opening of the metal sealing ring in a working state, and pre-deformation conversion is carried out on the basis of the diameter of the metal sealing ring in a free state and the diameter of the metal sealing ring in the working state, when the metal sealing ring machining device is used for machining, the angular positioning chock block (4) is inserted into the angular positioning groove (12) to angularly position the metal sealing ring.
2. The positioning numerical milling fixture according to claim 1, characterized in that the number of the axial positioning assemblies (2) is plural, and a plurality of the axial positioning assemblies (2) are distributed on the base plate (1) at intervals.
3. The positioning numerical milling fixture according to 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), the bushing (22) is fixedly mounted on the base 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 base 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) after penetrating through the slotted hole and is locked on the pressing plate (21).
4. A positioning numerical milling fixture according to claim 3, characterized in that the pressing plate (21) at the opening of the metal sealing ring is a pointed pressing plate for pressing against the projection of the hook-shaped opening when finishing the groove of the hook-shaped opening.
5. The positioning numerical milling fixture according to claim 1, wherein the radial positioning component (3) is located in the enclosed space of the limiting groove (11) and comprises a sliding block (31), a groove block (32), a groove block mounting screw (33), a knurled screw (34) and a spring (35), the groove block (32) is fixedly arranged on the bottom plate (1) through a groove block mounting screw (33), the groove block (32) is provided with a sliding groove which is arranged in the radial direction, the sliding block (31) is arranged in the sliding groove and can slide back and forth along the sliding groove, the knurled screw (34) is rotatably mounted on the groove block (32), one end of the sliding block penetrates through the groove block (32) and extends into the sliding groove to be matched with the sliding block (31), one end of the spring (35) is fixedly connected with the sliding block (31), the other end is fixedly connected with the groove wall of the groove block (32), the sliding block (31) is pushed to slide along the radial direction by rotating the knurled screw (34).
6. The positioning numerical milling fixture as recited in claim 5, characterized in that a slot hole is formed in the slide block (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 then is fixed on the bottom plate (1), and the sliding stroke of the slide block (31) is limited by the slot block mounting screw (33).
7. A numerical milling machining method for a metal sealing ring of a power turbine casing adopts the positioning numerical milling clamp as claimed in any one of claims 1 to 6, and is characterized by comprising the following steps:
mounting a positioning numerical milling fixture on a processing machine tool;
inserting the angular positioning chock block (4) into the angular positioning groove (12);
placing the metal sealing ring with the opening into the limiting groove (11), and enabling the first end at the opening of the metal sealing ring to be close to the angular positioning chock block (4);
the metal sealing ring is radially positioned and axially positioned by utilizing the radial positioning assembly (3) and the axial positioning assembly (2);
performing milling on the first end of the metal sealing ring;
and loosening the radial positioning assembly (3) and the axial positioning assembly (2), enabling the second end at the opening of the metal sealing ring to be tightly leaned on the angular positioning chock block (4), repeating the above steps, and performing the milling machining on the second end at the opening of the metal sealing ring.
8. The numerical milling method for the metal seal ring of the power turbine casing as set forth in claim 7, characterized in that the radial positioning and the axial positioning of the metal seal ring by the radial positioning assembly (3) and the remaining axial positioning assemblies (2) are embodied as follows:
firstly, the outer circle of the metal sealing ring is tightly attached to the outer circumferential surface of the limiting groove (11), then the axial positioning component (2) near the first end is lightly screwed, a feeler gauge is used for detection, one side, far away from the opening, of the axial positioning component (2) near the first end is selected as a detection point, the gap between the outer circle of the metal sealing ring and the outer circumferential surface of the limiting groove (11) at the detection point is ensured to meet the requirement of 0.02max, and the gap between the bottom surface of the metal sealing ring and the bottom surface of the limiting groove (11) meets the requirement of 0.02 max;
screwing the radial positioning assembly (3) with force to limit the first end of the metal sealing ring in the radial direction;
and screwing the rest axial positioning assemblies (2) to axially limit the whole metal sealing ring.
9. The method of claim 7 wherein the second end of the metal seal ring is lifted and lightly pressed by an axial locating component (2) adjacent the second end prior to roughing the first end of the metal seal ring.
10. The method for milling a metal seal ring of a power turbine casing according to claim 7, wherein the machining process is suspended while the groove of the hook-shaped opening is being finished, and the axial positioning assembly (2) with the pointed pressing plate at the opening is pressed against the projection of the hook-shaped opening.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210439909.1A CN114700537B (en) | 2022-04-25 | 2022-04-25 | Positioning numerical milling fixture and numerical milling processing method for metal sealing ring of power turbine casing |
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| CN202210439909.1A CN114700537B (en) | 2022-04-25 | 2022-04-25 | Positioning numerical milling fixture and numerical milling processing method for metal sealing ring of power turbine casing |
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Cited By (1)
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