CN113752133B - Automatic machining production line and machining method for high-pressure turbine guide blade - Google Patents

Automatic machining production line and machining method for high-pressure turbine guide blade Download PDF

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Publication number
CN113752133B
CN113752133B CN202111156341.4A CN202111156341A CN113752133B CN 113752133 B CN113752133 B CN 113752133B CN 202111156341 A CN202111156341 A CN 202111156341A CN 113752133 B CN113752133 B CN 113752133B
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China
Prior art keywords
machining
positioning
positioning block
guide
guide blade
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CN202111156341.4A
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CN113752133A (en
Inventor
王冬
朱杰
王震
王文博
党玉芳
白变琴
祝珂
廖帆
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AECC Aviation Power Co Ltd
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AECC Aviation Power Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/14Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding turbine blades, propeller blades or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/0023Other grinding machines or devices grinding machines with a plurality of working posts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/0069Other grinding machines or devices with means for feeding the work-pieces to the grinding tool, e.g. turntables, transfer means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00Other grinding machines or devices
    • B24B27/0076Other grinding machines or devices grinding machines comprising two or more grinding tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00Component parts such as frames, beds, carriages, headstocks
    • B24B41/06Work supports, e.g. adjustable steadies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

The invention relates to the technical field of automatic machining of turbine guide blades of aero-engines, in particular to an automatic machining production line and a machining method of high-pressure turbine guide blades.

Description

Automatic machining production line and machining method for high-pressure turbine guide blade
Technical Field
The invention relates to the technical field of automatic machining of turbine guide blades of aircraft engines, in particular to an automatic machining production line and a machining method of high-pressure turbine guide blades.
Background
The turbine guide vane of the aero-engine is used as an important component of the aero-engine, the guide vane is complex in structure, large in size and large in machining procedures, and the precision and the quality of the guide vane can affect the comprehensive performance of the aero-engine.
At present, four procedures are required to be carried out on a five-axis grinding center, a three-axis numerical control creep feed grinding machine and a numerical control milling center to process the guide vane, equipment states, part measurement, processing, cleaning and turnover need to be managed and maintained by a large amount of manpower in the processing process, and the processing efficiency of the guide vane is low.
Disclosure of Invention
The invention provides an automatic machining production line and a machining method for a high-pressure turbine guide blade, aiming at the problems that only a machining center can only machine a single guide blade each time and the machining efficiency is low in the prior art.
The invention is realized by the following technical scheme:
the utility model provides a high pressure turbine guide blade automatic processing produces line, includes the feed bin, clamping platform, first machining center, second machining center, three-coordinate measuring machine and the cleaning machine that the annular set up, and the annular center is equipped with the transfer apparatus, be equipped with a plurality of quick change frocks in the feed bin, all be equipped with the chuck on the machining center, chuck and quick change frock cooperation.
Preferably, the first machining center and the second machining center are both five-axis grinding machining centers.
Preferably, the quick-change tool comprises a fixture chassis, a first connecting assembly and a second connecting assembly, the first connecting assembly is arranged on one side of the fixture chassis, the second connecting assembly is arranged on one side, opposite to the first connecting assembly, of the fixture chassis, and the second connecting assembly is matched with the chuck.
Preferably, the first connecting assembly comprises a first positioning block and a second positioning block, the first positioning block and the second positioning block are arranged at intervals to form a positioning groove, and the positioning groove is used for placing guide vanes.
Preferably, the positioning device further comprises a third positioning block arranged at one end of the positioning groove, and the third positioning block is positioned at one side close to the first positioning block.
Preferably, a plurality of hold-down pins are further arranged inside the positioning groove.
Preferably, the clamp further comprises a pressing plate positioned above the positioning grooves, the pressing plate comprises a plurality of first positioning plates and a plurality of second positioning plates, one end of each first positioning plate is connected with the clamp chassis, the connecting point is positioned on one side of each first positioning block, which is opposite to the positioning groove, and the other end of each first positioning plate is arranged above the corresponding first positioning block in a hanging manner; one end of the second positioning plate is connected with the clamp chassis, the connecting point is located on one side, opposite to the positioning groove, of the second positioning block, and the other end of the second positioning plate is arranged above the second positioning block in a hanging mode.
Preferably, the second connecting assembly comprises a fourth positioning block and a plurality of pull pins, one side of the fourth positioning block is connected with the clamp chassis, and the other side of the fourth positioning block is used for being matched with the chuck; the pull pin is arranged along the edge circumference of the fourth positioning block, one end of the pull pin is connected with the clamp chassis, and the other end of the pull pin is matched with the chuck.
An automatic processing method for a guide vane of a high-pressure turbine comprises the following steps:
s1, taking out a guide blade from a material warehouse by transfer equipment, and transferring the guide blade to a clamping table;
s2, assembling the guide blade and the quick-change tool to form a machined part;
s3, transferring the workpiece to a first machining center by transfer equipment, and machining the air inlet side of the guide blade;
s4, transferring the workpiece from the first machining center to a second machining center by transferring equipment, and machining the exhaust side of the guide vane;
s5, transferring the machined part from the second machining center to a cleaning machine by transfer equipment, and cleaning and drying the machined part;
s6, transferring the workpiece to a three-coordinate measuring machine by transfer equipment, and detecting the guide blade; if the guide blade is unqualified in detection, the transfer equipment transfers the processed piece to a first processing center or a second processing center for compensation processing;
s7, after the guide blade is subjected to compensation processing, repeating S5 and S6 until the guide blade is qualified in detection;
and S8, after the guide blade is detected to be qualified, transferring the workpiece to a clamping table by transfer equipment for dismounting.
Preferably, S3 performs the machining of the next guide vane at the same time as the machining of one guide vane at S4.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the automatic processing production line of the guide blade of the high-pressure turbine, manual work is replaced by the transfer equipment and the quick-change tool to carry out turnover of the guide blade, so that the manual investment is reduced, the automation and the intellectualization of guide blade processing are improved, and the processing efficiency of the guide blade is improved.
Can fix a position guide vane through setting up the quick change frock, on supplementary guide vane assembles the machining center, help promoting guide vane's machining efficiency. And when the guide blade is transported, the guide blade can be protected, the loss of the guide blade is reduced, and the processing quality of the guide blade is improved.
The guide vane processed by the automatic processing method of the guide vane of the high-pressure turbine is firstly cleaned and dried, and then is detected on a three-coordinate measuring machine, so that the consistency of the processing size of the guide vane is improved, and the processing quality of the guide vane is improved. First machining center and second machining center carry out different guide vane's processing simultaneously, help promoting guide vane's machining efficiency.
Drawings
FIG. 1 is a layout diagram of an automatic processing line for a high pressure turbine guide vane according to the present invention;
FIG. 2 is a front view of a quick-change tool of an automatic high-pressure turbine guide blade processing line according to the present invention;
FIG. 3 is a top view of the quick-change tooling of the automatic processing production line of the guide blade of the high-pressure turbine of the invention;
fig. 4 is a perspective view of a quick-change tool of an automatic processing line of a high-pressure turbine guide blade according to the present invention.
In the figure: 1. a clamp chassis; 2. a first connection assembly; 201. a first positioning block; 202. a second positioning block; 203. a third positioning block; 204. pressing a plate; 2041. a first positioning plate; 2042. a second positioning plate; 205. a hold down pin; 3. a second connection assembly; 301. a fourth positioning block; 302. pulling a pin; 4. positioning a groove; 5. a material warehouse; 6. a clamping table; 7. a first machining center; 8. a second machining center; 9. a three-coordinate measuring machine; 10. a cleaning machine; 11. a transfer device; 12. quickly replacing the tool; 13. a unit controller.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention discloses an automatic machining production line of a high-pressure turbine guide blade, which comprises a material warehouse 5, a clamping table 6, a first machining center 7, a second machining center 8, a three-coordinate measuring machine 9 and a cleaning machine 10 which are annularly arranged, wherein the annular center is provided with a transfer device 12, a plurality of quick-change tools 13 are arranged in the material warehouse 5, the material warehouse 5 comprises a tool warehouse and a transfer warehouse, the quick-change tools 13 are placed in the tool warehouse, twelve sets of quick-change tools 13 are arranged in the embodiment, and the transfer warehouse can temporarily store the clamped guide blade, so that the machining coordination and flexibility of the guide blade can be improved.
All be equipped with the chuck on the processing center, the chuck cooperates with quick change frock 13. The first machining center 7 and the second machining center 8 are five-axis grinding machining centers, twenty-four cutters can be assembled in tool magazines of the first machining center 7 and the second machining center 8 in the embodiment, the cutters comprise grinding wheels, CBN grinding wheels, drilling cutters, milling cutters, reamers and the like, conversion of the cutters can be carried out according to machining characteristics, position conversion in the machining process of the guide vanes is reduced, and the guide vanes are beneficial to improving the machining efficiency.
Transfer device 12 can transport guide vane and quick change frock, and transfer device 12 is the robot in this embodiment, and the robot model is KR C4, and transfer device 12 is controlled by unit controller 13, is convenient for adjust guide vane's processing.
Cleaning machine 10 washs and dries integratively, and cleaning machine 10 can wash and dry by the fire the guide vane after the processing, reduces remaining processing piece on the guide vane, is convenient for carry out the subsequent measurement of guide vane, reduces the error when guide vane measures, helps promoting guide vane's processingquality.
Referring to fig. 2 and 3, the quick-change tool comprises a fixture chassis 1, a first connecting assembly 2 and a second connecting assembly 3, the first connecting assembly 2 is arranged on one side of the fixture chassis 1, the first connecting assembly 2 comprises a first positioning block 201 and a second positioning block 202, the first positioning block 201 and the second positioning block 202 are arranged on the fixture chassis 1 at intervals through screws and form a positioning groove 4, and the positioning groove 4 is used for placing guide vanes.
Referring to fig. 3 and 4, a third positioning block 203 is disposed at one end of the positioning groove 4 by a screw, and the third positioning block 203 is located at a side close to the first positioning block 201.
A plurality of hold-down pins 205 are provided inside the positioning groove 4.
A plurality of pressing plates 204 are further disposed above the positioning grooves 4, each pressing plate 204 includes a plurality of first positioning plates 2041 and a plurality of second positioning plates 2042, in this embodiment, there are four pressing plates 204, and there are two first positioning plates 2041 and two second positioning plates 2042.
One end of the first positioning plate 2041 is connected with the fixture chassis 1 through a screw, a connection point of the first positioning plate 2041 and the fixture chassis 1 is located on one side of the first positioning block 201 opposite to the positioning groove 4, and the other end of the first positioning plate 2041 is arranged above the first positioning block 201 in a hanging manner. One end of the second positioning plate 2042 is connected to the fixture chassis 1 through a screw, and the connection point is located on the side of the second positioning block 202 opposite to the positioning groove 4, and the other end of the second positioning plate 2042 is suspended above the second positioning block 202.
Referring to fig. 3, the second connecting assembly 3 is disposed on a side of the fixture chassis 1 opposite to the first connecting assembly 2, the second connecting assembly 3 includes a fourth positioning block 301 and a plurality of pull pins 302, one side of the fourth positioning block 301 is connected to the fixture chassis 1 by screws, and the other side is used for being matched with the machining center; the pull pin 302 is circumferentially arranged along the edge of the fourth positioning block 301, one end of the pull pin 302 is connected with the clamp chassis 1, and the other end of the pull pin 302 is matched with the machining center.
According to the automatic processing production line for the guide blades of the high-pressure turbine, the guide blades are turned around by using the transfer equipment 12 and the quick-change tool 13, the production state of equipment and the processing state of the guide blades on the production line can be monitored and adjusted in real time, the processing capacity of the production line is brought into full play, the automation and the intellectualization of the guide blade processing are improved, and the processing efficiency of the guide blades is improved.
The invention also discloses an automatic processing method of the guide vane of the high-pressure turbine, which comprises the following steps:
s1, taking out a guide blade from a material warehouse 5 by a transfer device 12, and transferring the guide blade to a clamping table 6;
s2, assembling the guide blade and the quick-change tool 13 to form a machined part, wherein the assembling steps are as follows:
the inlet side edge plate of the guide vane is located in the positioning groove 4 and contacts with the side wall of the positioning groove 4, so that the end surface and the radial direction of the edge plate of the guide vane can be positioned. Meanwhile, the air inlet side edge plate of the guide vane is in contact with one side, close to the positioning groove 4, of the third positioning block 203, so that the guide vane can be positioned in an intersecting manner;
and then, the guide blade is pressed by the pressing pin 205 and the pressing plate 204, so that the guide blade is assembled with the quick-change tooling 13. Then, the fourth positioning block 301 may position the quick-change tool 13 on the first machining center 7 or the second machining center 8, so that the pull pin 302 is convenient to connect the fixture chassis 1 with the chuck, and further, the guide blade and the quick-change tool 13 are assembled;
s3, the transfer equipment 12 transfers the assembled quick-change tool 13 and the guide vane to the first machining center 7, and machining of the air inlet side of the guide vane is performed, wherein the machining steps are as follows:
s31, machining arcs and end faces of the outer edge plates on the air inlet sides;
s32, machining arcs and end faces of the inner edge plates on the air inlet sides;
s33, machining a narrow groove of the outer edge plate on the air inlet side;
s34, machining a narrow groove of the inner edge plate of the air inlet side;
s35, processing wedge surfaces of the leaf basins;
s36, machining four small holes in the inner edge plate and the outer edge plate of the air inlet side;
s4, the transfer device 12 transfers the workpiece from the first machining center 7 to the second machining center 8, and the exhaust side of the guide vane is machined, wherein the machining steps are as follows:
s41, processing the arc and the end face of the outer edge plate on the exhaust side;
s42, processing the arc and the end face of the inner edge plate on the exhaust side;
s43, processing a blade back wedge surface;
s44, processing two large holes and chamfers of the edge plate;
in S4, while one guide vane is machined, S3 performs the next guide vane. Two guide vanes are processed simultaneously, and the processing efficiency of the guide vanes can be further improved.
After S4, the guide vane has a machining allowance, which is 0.1mm in this embodiment. The allowance is reserved for reducing the damage of the guide vane in the machining process, the machining quality of the guide vane is further improved, and the damage rate of the guide vane is reduced.
S5, transferring the machined part from the second machining center 8 to the cleaning machine 10 by the transferring device 12, and cleaning and drying the machined part;
s6, the transfer equipment 12 transfers the machined part to the three-coordinate measuring machine 9, a detection program is configured on the three-coordinate measuring machine 9, and the guide blades are detected, so that the consistency of the machining size of the guide blades can be improved, and the machining quality of the guide blades is improved; if the guide blade is unqualified in detection, the transfer equipment 12 transfers the processed piece to the first processing center 7 or the second processing center 8 for compensation processing;
s7, after the guide blade is subjected to compensation processing, repeating S5 and S6 until the guide blade is qualified in detection;
s8, after the guide blade is detected to be qualified, the transfer equipment 12 transfers the machined part to the clamping table 6 for disassembly, the marking machine is used for marking the guide blade, the marking machine marks the guide blade, and the auxiliary personnel manage the guide blade.
The automatic processing method of the guide vane of the high-pressure turbine not only improves the production efficiency of guide vane processing, but also improves the processing quality of the guide vane and reduces the damage rate of the guide vane during processing.

Claims (7)

1. The automatic machining production line for the guide blades of the high-pressure turbine is characterized by comprising an annularly arranged material warehouse (5), a clamping table (6), a first machining center (7), a second machining center (8), a three-coordinate measuring machine (9) and a cleaning machine (10), wherein the annular center is provided with a transfer device (12), a plurality of quick-change tools (13) are arranged in the material warehouse (5), chucks are arranged on the machining centers, and the chucks are matched with the quick-change tools (13);
the quick-change tool comprises a clamp chassis (1), a first connecting assembly (2) and a second connecting assembly (3), wherein the first connecting assembly (2) is arranged on one side of the clamp chassis (1), the second connecting assembly (3) is arranged on one side of the clamp chassis (1) opposite to the first connecting assembly (2), and the second connecting assembly (3) is matched with a chuck;
the first connecting assembly (2) comprises a first positioning block (201) and a second positioning block (202), the first positioning block (201) and the second positioning block (202) are arranged at intervals and form positioning grooves (4), and the positioning grooves (4) are used for placing guide vanes;
the clamp is characterized by further comprising a pressing plate (204) positioned above the positioning grooves, wherein the pressing plate (204) comprises a plurality of first positioning plates (2041) and a plurality of second positioning plates (2042), one end of each first positioning plate (2041) is connected with the clamp chassis (1), the connection point is positioned on one side, opposite to the positioning groove (4), of the first positioning block (201), and the other end of each first positioning plate is arranged above the first positioning block (201) in a hanging mode; one end of the second positioning plate (2042) is connected with the clamp chassis (1), the connection point is located on one side of the second positioning block (202) opposite to the positioning groove (4), and the other end of the second positioning block is arranged above the second positioning block (202) in a suspended mode.
2. The automatic high-pressure turbine guide blade machining line according to claim 1, wherein the first machining center (7) and the second machining center (8) are both five-axis grinding machining centers.
3. The automatic high-pressure turbine guide blade processing line as claimed in claim 1, further comprising a third positioning block (203) disposed at one end of the positioning slot (4), wherein the third positioning block (203) is located at a side close to the first positioning block (201).
4. The automatic high-pressure turbine guide vane production line according to claim 1, characterized in that a plurality of hold-down pins (205) are further provided inside the positioning groove (4).
5. The automatic high-pressure turbine guide blade machining line according to claim 1, wherein the second connecting assembly (3) comprises a fourth positioning block (301) and a plurality of pull pins (302), one side of the fourth positioning block (301) is connected with the fixture chassis (1), and the other side is used for being matched with a chuck; the pull pin (302) is arranged along the edge circumference of the fourth positioning block (301), one end of the pull pin (302) is connected with the clamp chassis (1), and the other end of the pull pin is matched with the chuck.
6. An automatic processing method of a high-pressure turbine guide vane, which adopts the automatic processing production line of the high-pressure turbine guide vane as claimed in any one of claims 1 to 5, and is characterized by comprising the following steps:
s1, a transfer device (12) takes out a guide blade from a material warehouse (5) and transfers the guide blade to a clamping table (6);
s2, assembling the guide blade and a quick-change tool (13) to form a machined part;
s3, transferring the machined part to a first machining center (7) by the transfer equipment (12), and machining the air inlet side of the guide blade;
s4, transferring the workpiece from the first machining center (7) to the second machining center (8) by the transfer device (12), and machining the exhaust side of the guide vane;
s5, transferring the machined part from the second machining center (8) to a cleaning machine (10) by using transfer equipment (12) for cleaning and drying;
s6, transferring the workpiece to a three-coordinate measuring machine (9) by the transfer equipment (12) to detect the guide blade; if the guide blade is unqualified in detection, the transfer equipment (12) transfers the machined part to the first machining center (7) or the second machining center (8) for compensation machining;
s7, after the guide blade is subjected to compensation processing, repeating S5 and S6 until the guide blade is qualified in detection;
s8, after the guide blades are detected to be qualified, the transfer equipment (12) transfers the machined parts to the clamping table (6) for disassembly.
7. The automatic processing method of the guide vane of the high pressure turbine as claimed in claim 6, wherein S3 is performed for the next guide vane at the same time as S4 is performed for the one guide vane.
CN202111156341.4A 2021-09-29 2021-09-29 Automatic machining production line and machining method for high-pressure turbine guide blade Active CN113752133B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115157123A (en) * 2022-08-25 2022-10-11 南京农业大学 Fixture and grinding method for grinding upper citron plate side face and lower citron plate air inlet edge of gas turbine guide vane fan-shaped piece
CN115194594A (en) * 2022-08-25 2022-10-18 南京农业大学 Fixture and grinding method for grinding exhaust edge of lower citron plate of gas turbine guide vane fan-shaped piece

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Publication number Priority date Publication date Assignee Title
CN103949918A (en) * 2014-05-19 2014-07-30 合肥波林新材料有限公司 Five-face processing and quick-changing tool capable of clamping multiple to-be-processed parts
CN106270859A (en) * 2016-08-29 2017-01-04 中航动力股份有限公司 A kind of guide vane listrium dustpan hole machined is quickly remodeled clamping device and method
CN110695747A (en) * 2019-10-09 2020-01-17 安泰天龙钨钼科技有限公司 Intelligent processing production line and processing technology for tungsten-molybdenum parts
CN210704411U (en) * 2019-08-26 2020-06-09 无锡润和叶片制造有限公司 General quick change anchor clamps of aviation die forging blade
CN113245884A (en) * 2021-02-09 2021-08-13 北京卫星制造厂有限公司 Quick reloading system and method based on zero point positioning

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103949918A (en) * 2014-05-19 2014-07-30 合肥波林新材料有限公司 Five-face processing and quick-changing tool capable of clamping multiple to-be-processed parts
CN106270859A (en) * 2016-08-29 2017-01-04 中航动力股份有限公司 A kind of guide vane listrium dustpan hole machined is quickly remodeled clamping device and method
CN210704411U (en) * 2019-08-26 2020-06-09 无锡润和叶片制造有限公司 General quick change anchor clamps of aviation die forging blade
CN110695747A (en) * 2019-10-09 2020-01-17 安泰天龙钨钼科技有限公司 Intelligent processing production line and processing technology for tungsten-molybdenum parts
CN113245884A (en) * 2021-02-09 2021-08-13 北京卫星制造厂有限公司 Quick reloading system and method based on zero point positioning

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