CN112247613A - Clamping tool for machining arc of end face of stationary blade of steam turbine and using method of clamping tool - Google Patents
Clamping tool for machining arc of end face of stationary blade of steam turbine and using method of clamping tool Download PDFInfo
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- CN112247613A CN112247613A CN202010961398.0A CN202010961398A CN112247613A CN 112247613 A CN112247613 A CN 112247613A CN 202010961398 A CN202010961398 A CN 202010961398A CN 112247613 A CN112247613 A CN 112247613A
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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
- B23Q3/063—Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding turbine blades
Abstract
The invention discloses a clamping tool for processing the end surface arc of a turbine stator blade and a use method thereof, relating to the field of turbine blades, comprising a bottom plate, wherein a blade profile positioning and supporting component, a blade profile pressing component and a blade thimble device which can slide along the bottom plate are arranged on the bottom plate, the blade profile positioning and supporting component comprises a large-head profile positioning supporting block and a small-head profile positioning supporting block, positioning profiles are respectively arranged on the two profile positioning supporting blocks, the positioning profiles are respectively matched with the inner arc profiles of the large head and the small head of the blade, the two profile positioning supporting blocks can be clamped into two bottom plate through grooves and are provided with screw nuts, the two profile positioning supporting blocks are matched and locked with T-shaped nuts embedded in the fixed through grooves through the screw nuts, the blade profile pressing component comprises a large-head pressing plate beam, a small-head pressing plate beam and an L-shaped supporting block group, a pressing block contacted with, the blade thimble device is provided with a tip for tightly propping against the back arc molded surface of the blade.
Description
Technical Field
The invention relates to the field of turbine blade tools, in particular to a clamping tool for machining arcs of end faces of turbine stationary blades and a using method of the clamping tool.
Background
The both ends face of middle-size and small-size stator blade of steam turbine adopts the mode of wire-electrode cutting to process usually, rethread finish polishing throws the terminal surface molybdenum filament seal, however the overall length of middle-size and large-size stator blade can surpass the stroke of wire-electrode cutting machine tool in the enterprise usually, need use numerical control machining center to accomplish the processing of stator blade terminal surface circular arc, simultaneously because the interior back arc profile and the overall length of the steam turbine stator blade of different grades all are inequality, the stator blade of different grades of processing at every turn all need design supporting special fixture to fix a position and fix, not only can increase the manpower, equipment, the consumption of material etc., make manufacturing cost improve, and only once only use after special fixture processing is accomplished usually just to put into the frock storehouse and preserve the management, maintenance cost has been increased, thereby the production cycle that has leaded to the stator blade is lengthened, unnecessary waste.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the clamping tool for machining the end face circular arc of the turbine stator blade and the use method thereof, which can adapt to the stator blades with different blade profiles and different overall lengths, and solve the problems of poor universality and long manufacturing period of the conventional special clamp, thereby effectively avoiding the waste of resources.
The present invention achieves the above-described object by the following technical means.
A clamping tool for machining an arc of an end face of a stationary blade of a steam turbine comprises a bottom plate, wherein a blade profile positioning and supporting assembly, a blade profile pressing assembly and a blade ejector pin device which can slide along the bottom plate are arranged on the bottom plate; the blade profile positioning and supporting assembly comprises a large-head profile positioning supporting block and a small-head profile positioning supporting block which are arranged in parallel, profile grooves are respectively formed in the large-head profile positioning supporting block and the small-head profile positioning supporting block, and the size of each profile groove corresponds to the inner arc profile at the large head and the small head of the stationary blade; the blade thimble device positions the stationary blade through a thimble; the blade profile pressing assembly presses the stationary blade through the pressing block.
Furthermore, a blade profile pressing component and a blade ejector pin device are sequentially arranged along the longitudinal direction of the large-head profile positioning support block and the small-head profile positioning support block.
Further, the blade thimble device comprises a thimble seat and a thimble; the thimble seat is opened has the several thimble hole in the direction of height, the thimble is installed in the thimble hole according to the stator blade position, the thimble seat passes through fixing bolt and the cooperation of the T type nut that corresponds and locks on the bottom plate.
Furthermore, the blade profile pressing component comprises a large-head pressing plate cross beam and a small-head pressing plate cross beam, the large-head pressing plate cross beam and the small-head pressing plate cross beam are respectively located above the large-head profile positioning supporting block and the small-head profile positioning supporting block, limiting grooves are formed in the large-head pressing plate cross beam and the small-head pressing plate cross beam, and pressing blocks used for pressing the back arc profiles of the static blades are arranged in the limiting grooves.
Furthermore, the compressing block is in a herringbone shape and is hinged and installed in the limiting grooves of the large-head pressing plate cross beam and the small-head pressing plate cross beam through pin shafts respectively, and the contact surface of the compressing block and the back arc-shaped surface of the static blade is a spherical surface.
Furthermore, the limiting groove structure is a trapezoid opening structure, and the trapezoid opening structure is used for limiting the movable angle of the pressing block.
Furthermore, a group of T-shaped fixing through grooves which are parallel to each other and a group of fixing through grooves which are parallel to each other are respectively formed in the bottom plate along the length direction of the bottom plate; t-shaped nuts are arranged in T-shaped fixing through grooves formed in the bottom plate, and the T-shaped nuts are embedded into the T-shaped fixing through grooves and can only move along the groove direction.
Furthermore, the large-head profile positioning support block and the small-head profile positioning support block are respectively fixed in a T-shaped fixing through groove and a fixing through groove which are oppositely arranged; and a pair of screw nuts are respectively arranged on the large-head profile positioning supporting block and the small-head profile positioning supporting block and are matched and locked with the corresponding T-shaped nuts through the screw nuts.
Furthermore, the large-head pressure plate cross beam and the small-head pressure plate cross beam are fixedly kept with the first L-shaped supporting block, the second L-shaped supporting block, the third L-shaped supporting block and the fourth L-shaped supporting block which are arranged on two sides of the bottom plate through fastening screws.
The use method of the clamping tool for machining the end face arc of the turbine stationary blade comprises the following steps:
the method comprises the following steps: processing a profile groove on the large-head profile positioning support block and the small-head profile positioning support block according to the inner arc profiles at the large head and the small head of the stator blade;
step two: the large head profile positioning support block and the small head profile positioning support block are arranged on the bottom plate, and the static blades are placed in profile grooves in the large head profile positioning support block and the small head profile positioning support block;
step three: installing a blade thimble device on the bottom plate and at the middle section position of the static blade, screwing the thimble to enable the needle head of the thimble to be contacted and tightly propped with the back arc molded surface of the static blade, thereby completing the positioning and transverse fixing operation of the static blade;
step four: the pressing blocks on the large-head pressing plate cross beam and the small-head pressing plate cross beam of the blade profile pressing assembly rotate through the pin shafts, so that pressing force is generated on the surface of the static blade, axial fixing of the static blade is achieved, and clamping of the static blade is achieved. Compared with the prior art, the invention has the following beneficial effects:
1. the invention changes the existing integral fixture form into the universal modular fixture form, when processing different stationary blades, only the blade profile positioning support component which is adapted to the inner and back arc profiles and the total length requirements of the stationary blade is needed to be manufactured for replacement, namely, the modularization of fixture parts is realized, thereby avoiding the waste of manpower, equipment, materials and the like caused by the fact that the blades with different total lengths and blade body profiles need to be manufactured with special equipment, and simultaneously greatly improving the universality of the fixture.
2. The modular parts are simple and convenient to manufacture and low in cost, and the manufacturing cost, the manufacturing period and the storage space of the tool magazine of the fixture are greatly saved.
3. The invention can realize the rapid positioning and clamping of the processed stator blade through the large and small head molded surface positioning support blocks, improve the labor productivity and shorten the production period of the stator blade.
Drawings
Fig. 1 is a schematic structural diagram of a clamping tool for machining an end face arc of a stationary blade of a steam turbine according to an embodiment of the invention;
FIG. 2 is a schematic right-side view of FIG. 1 of the present invention;
3 FIG. 3 3 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 at 3 A 3- 3 A 3 of 3 FIG. 3 1 3 in 3 accordance 3 with 3 the 3 present 3 invention 3; 3
FIG. 4 is a top view of FIG. 1 in accordance with the present invention.
The reference numbers are as follows:
1-a bottom plate; 2-T type fixed through groove; 3-fixing the through groove; 4-positioning a supporting block on the big head profile; 5-screw and nut; 6-stationary blades; 7-a first L-shaped support block; 8-big head press plate beam; 9-a pin shaft; 10-a small-head profile positioning support block; 11-a third L-shaped support block; 12-a small head platen beam; 13-a compression block; 14-a fastening screw; 15-a fourth L-shaped support block; 16-thimble seat; 17-a thimble; 18-thimble holes; 19-fixing the bolt; 20-a second L-shaped support block; 21-T type nut; 22-a limiting groove; 23-a blade profile positioning support assembly; 24-a blade profile hold down assembly; 25-blade thimble device.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following first describes in detail embodiments according to the present invention with reference to the accompanying drawings
The clamping tool for machining the end surface arc of the turbine stationary blade shown in the attached drawings 1 to 4 comprises a bottom plate 1, wherein a blade profile positioning and supporting assembly 23, a blade profile pressing assembly 24 and a blade ejector pin device 25 are arranged on the bottom plate 1; the blade profile positioning and supporting assembly 23 comprises a large-head profile positioning and supporting block 4 and a small-head profile positioning and supporting block 10 which are arranged in parallel, profile grooves are respectively arranged on the large-head profile positioning and supporting block 4 and the small-head profile positioning and supporting block 10, the profile grooves correspond to the inner arc profiles of the large head and the small head of the stator blade 6, a group of T-shaped fixing through grooves 2 and a group of fixing through grooves 3 which are parallel to each other are respectively arranged on the bottom plate 1 along the length direction of the bottom plate, T-shaped nuts 21 are arranged in the T-shaped fixing through grooves 2, the T-shaped nuts 21 are embedded into the T-shaped fixing through grooves 2 and can only move along the groove direction, the large-head profile positioning and supporting block 4 and the small-head profile positioning and supporting block 10 are respectively clamped into the fixing through grooves 3 which are oppositely arranged, a pair of screw nuts 5 are respectively arranged on the two profile positioning and supporting blocks, and are, thereby ensuring the stability of the structure in the moving process and the processing process.
The blade profile pressing assembly 24 comprises a large-head pressing plate beam 8, a small-head pressing plate beam 12 and an L-shaped support block group, the large-head pressing plate beam 8 and the small-head pressing plate beam 12 are respectively positioned above the large-head profile positioning support block 4 and the small-head profile positioning support block 10, and limit grooves 22 are formed in the middle positions of the large-head pressing plate beam 8 and the small-head pressing plate beam 12; the pressing blocks 13 used for pressing the back arc-shaped surfaces of the static blades 6 are arranged in the limiting grooves 22, the limiting grooves 22 are trapezoidal openings, the openings of the limiting grooves can limit the moving angles of the pressing blocks 13, the pressing blocks 13 are herringbone and are respectively installed in the limiting grooves 22 of the large-head pressing plate cross beam 8 and the small-head pressing plate cross beam 12 in a hinged mode through pin shafts 9, and the contact surfaces of the pressing blocks 13 and the back arc-shaped surfaces of the static blades 6 are spherical surfaces so as to adapt to various contact surfaces.
When the clamping tool is used for clamping a turbine stator blade, firstly, profile shift lines for positioning are respectively drawn at positions, close to a large head and a small head, of the stator blade 6 according to a drawing, a large head profile positioning support block 4 and a small head profile positioning support block 10 are respectively clamped into a T-shaped fixing through groove 2 on a bottom plate 1 according to the distance of the profile shift lines on the drawing, a screw nut 5 is used for being matched with a T-shaped nut arranged in the T-shaped fixing through groove 2 to lock the profile large head profile positioning support block 4 and the small head profile positioning support block 10, the stator blade 6 is placed on the large head profile positioning support block 4 and the small head profile positioning support block 10 according to the drawn profile shift line, a blade thimble device 25 is installed on the bottom plate 1 and is positioned at the middle section position of the stator blade 6, a thimble 17 is screwed to enable a needle head of the thimble 17 to be in contact with and prop up with a back arc profile of the stator blade, Transverse fixing operation; two groups of L-shaped supporting blocks are arranged on two sides of the static blades 6, a large-head pressing plate cross beam 8 and a small-head pressing plate cross beam 12 are fixedly connected with the L-shaped supporting blocks through fastening screws 14, and pressing blocks 13 on the large-head pressing plate cross beam 8 and the small-head pressing plate cross beam 12 rotate through pin shafts 9, so that pressing force is generated on the surfaces of the static blades 6, axial fixing operation of the static blades is achieved, and clamping operation of the static blades is achieved;
when the end surface circular arcs of the static blades with different profiles or total lengths are processed, the positions of the large-head profile positioning support block 4 and the small-head profile positioning support block 10 in the T-shaped fixing through groove 2 are adjusted according to the drawing size, meanwhile, the ejector pin 17 selects a proper ejector pin hole 18 according to the position of the static blade 6, so that the static blades with different total lengths can be transversely fixed, the large-head pressure plate cross beam 8 and the small-head pressure plate cross beam 12 simultaneously act on the large and small heads of the static blades, the pressure head of the pressure block is processed into a spherical surface to adapt to various curved surfaces, the vertical compression of the static blades with different profiles can be realized, meanwhile, the blade profiles can be protected from being scratched, the reliable positioning and clamping operation of the static blades with different models is further ensured, the flexibility and the universality of the invention are further improved, the consumption of resources such as manpower, equipment and materials is further avoided, and the cost of the tool for storage and, therefore, the design and processing amount of the clamp is greatly reduced, the tool manufacturing cost is reduced, the tool design period and the processing period are shortened, and the production preparation efficiency and the stator blade processing efficiency are effectively improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A clamping tool for machining arcs of end faces of stationary blades of a steam turbine is characterized by comprising a base plate (1), wherein a blade profile positioning and supporting assembly (23), a blade profile pressing assembly (24) and a blade ejector pin device (25) which can slide along the base plate (6) are arranged on the base plate (1); the blade profile positioning and supporting assembly (23) comprises a large-head profile positioning supporting block (4) and a small-head profile positioning supporting block (10) which are arranged in parallel, profile grooves are respectively formed in the large-head profile positioning supporting block (4) and the small-head profile positioning supporting block (10), and the size of each profile groove corresponds to the inner arc profile at the large head and the small head of the static blade (6); the blade thimble device (25) positions the stationary blade (6) through a thimble (17); the blade profile pressing assembly (24) presses the stationary blade (6) through the pressing block (13).
2. The clamping tool for machining the end surface circular arc of the stationary blade of the steam turbine according to claim 1, wherein a blade profile pressing assembly (24) and a blade ejector pin device (25) are sequentially arranged along the longitudinal direction of the large-head profile positioning support block (4) and the small-head profile positioning support block (10).
3. The clamping tool for machining the arc of the end face of the stationary blade of the steam turbine according to claim 1, wherein the blade ejector pin device (25) comprises an ejector pin seat (16) and an ejector pin (17); the thimble seat (16) is opened on the direction of height has several thimble holes (18), thimble (17) are installed in thimble hole (18) according to stator blade (6) position, thimble seat (16) are locked on bottom plate (1) through fixing bolt (19) and the cooperation of the T type nut (21) that corresponds.
4. The clamping tool for machining the end face circular arc of the stationary blade of the steam turbine according to claim 1, wherein the blade profile pressing assembly (24) comprises a large-head pressing plate cross beam (8) and a small-head pressing plate cross beam (12), the large-head pressing plate cross beam (8) and the small-head pressing plate cross beam (12) are respectively located above the large-head profile positioning support block (4) and the small-head profile positioning support block (10), limiting grooves (22) are formed in the large-head pressing plate cross beam (8) and the small-head pressing plate cross beam (12), and pressing blocks (13) used for pressing the back arc profiles of the stationary blades (6) are mounted in the limiting grooves (22).
5. The clamping tool for machining the end face circular arc of the stationary blade of the steam turbine as claimed in claim 4, wherein the pressing block (13) is in a herringbone shape and is respectively and hingedly mounted in the limiting grooves (22) of the large-head pressure plate cross beam (8) and the small-head pressure plate cross beam (12) through a pin shaft (9), and the contact surface of the pressing block (13) and the back arc profile of the stationary blade (6) is set to be a spherical surface.
6. The clamping tool for machining the end face circular arc of the stationary blade of the steam turbine according to any one of claims 4 or 5, wherein the limiting groove (22) is of a trapezoidal opening structure, and the trapezoidal opening structure is used for limiting the moving angle of the pressing block (13).
7. The clamping tool for machining the end surface arc of the stationary blade of the steam turbine as claimed in claim 1, wherein the bottom plate (1) is provided with a group of T-shaped fixing through grooves (2) and a group of fixing through grooves (3) which are parallel to each other along the length direction of the bottom plate; t-shaped nuts (21) are arranged in T-shaped fixing through grooves (2) formed in the bottom plate (1), and the T-shaped nuts (21) are embedded in the T-shaped fixing through grooves (2) and can only move along the groove direction.
8. The clamping tool for machining the end surface arc of the stationary blade of the steam turbine as claimed in claim 1, wherein the large-head profile positioning support block (4) and the small-head profile positioning support block (10) are respectively fixed in the T-shaped fixing through groove (2) and the fixing through groove (3) which are oppositely arranged; and a pair of screw nuts (5) are respectively arranged on the large-head profile positioning supporting block (4) and the small-head profile positioning supporting block (10) and are matched and locked with the corresponding T-shaped nuts (21) through the screw nuts (5).
9. The clamping tool for machining the end face circular arc of the turbine stationary blade is characterized in that the large-head pressure plate cross beam (8) and the small-head pressure plate cross beam (12) are fixedly connected with the first L-shaped supporting block (7), the second L-shaped supporting block (20), the third L-shaped supporting block (11) and the fourth L-shaped supporting block (15) which are arranged on two sides of the bottom plate (1) through fastening screws (14).
10. The use method of the clamping tool for machining the arc of the end face of the stationary blade of the steam turbine as claimed in any one of claims 1 to 5 and 7 to 9, is characterized by comprising the following steps:
the method comprises the following steps: according to the inner arc profiles at the large head and the small head of the stator blade (6), profile grooves on a large head profile positioning support block (4) and a small head profile positioning support block (10) are processed;
step two: the large-head profile positioning support block (4) and the small-head profile positioning support block (10) are respectively arranged on the bottom plate (1) according to the distance of a profile shift line on a design drawing, and the static blades (6) are placed in profile grooves on the large-head profile positioning support block (4) and the small-head profile positioning support block (10);
step three: installing a blade thimble device (25) on the bottom plate (1) and at the middle section position of the static blade (6), screwing the thimble (17) to enable the needle head of the thimble (17) to be contacted and tightly jacked with the back arc molded surface of the static blade (6), thereby completing the positioning and transverse fixing operations of the static blade (6);
step four: a pressing block (13) on a large-head pressing plate cross beam (8) and a small-head pressing plate cross beam (12) of the blade profile pressing assembly (24) rotate through a pin shaft (9), so that pressing force is generated on the surface of the static blade (6), axial fixing of the static blade (6) is achieved, and clamping of the static blade (6) is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010961398.0A CN112247613A (en) | 2020-09-14 | 2020-09-14 | Clamping tool for machining arc of end face of stationary blade of steam turbine and using method of clamping tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010961398.0A CN112247613A (en) | 2020-09-14 | 2020-09-14 | Clamping tool for machining arc of end face of stationary blade of steam turbine and using method of clamping tool |
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| Publication Number | Publication Date |
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| CN112247613A true CN112247613A (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010961398.0A Pending CN112247613A (en) | 2020-09-14 | 2020-09-14 | Clamping tool for machining arc of end face of stationary blade of steam turbine and using method of clamping tool |
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| Country | Link |
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| CN (1) | CN112247613A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112975669A (en) * | 2021-03-17 | 2021-06-18 | 中国航发动力股份有限公司 | Blade machining clamping device and method |
| CN113787223A (en) * | 2021-09-29 | 2021-12-14 | 中国航发航空科技股份有限公司 | Blade circumferential arc hammer foot-shaped tenon machining device and machining method thereof |
| CN114193009A (en) * | 2021-12-06 | 2022-03-18 | 上海航天电子通讯设备研究所 | A general clamping device for microwave subassembly laser seal welding |
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| CN210615814U (en) * | 2019-07-27 | 2020-05-26 | 无锡市艾尔福叶片有限公司 | Large-scale hydraulic turbine blade bores centre bore positioning fixture |
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| DE102004056142A1 (en) * | 2004-11-20 | 2006-06-01 | Mtu Aero Engines Gmbh | Fastening for stabilizing turbine blade, has power transmission device with power transmission units, which are formed with clamping unit to transfer power to blade`s upper surface in selective and individual manner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112975669A (en) * | 2021-03-17 | 2021-06-18 | 中国航发动力股份有限公司 | Blade machining clamping device and method |
| CN113787223A (en) * | 2021-09-29 | 2021-12-14 | 中国航发航空科技股份有限公司 | Blade circumferential arc hammer foot-shaped tenon machining device and machining method thereof |
| CN114193009A (en) * | 2021-12-06 | 2022-03-18 | 上海航天电子通讯设备研究所 | A general clamping device for microwave subassembly laser seal welding |
| CN114193009B (en) * | 2021-12-06 | 2024-04-05 | 上海航天电子通讯设备研究所 | Universal clamping device for laser seal welding of microwave assembly |
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Application publication date: 20210122 |
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| RJ01 | Rejection of invention patent application after publication |