CN203579366U - Seven-shaft linkage numerical-control abrasive-belt grinding and polishing machine tool - Google Patents

Seven-shaft linkage numerical-control abrasive-belt grinding and polishing machine tool Download PDF

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Publication number
CN203579366U
CN203579366U CN201320826632.4U CN201320826632U CN203579366U CN 203579366 U CN203579366 U CN 203579366U CN 201320826632 U CN201320826632 U CN 201320826632U CN 203579366 U CN203579366 U CN 203579366U
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CN
China
Prior art keywords
column
axle
grinding
machine tool
bistrique
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Withdrawn - After Issue
Application number
CN201320826632.4U
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Chinese (zh)
Inventor
黄智�
衡凤琴
宫大为
陈学尚
许可
陈士行
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Priority to CN201320826632.4U priority Critical patent/CN203579366U/en
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Publication of CN203579366U publication Critical patent/CN203579366U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a seven-shaft linkage numerical-control abrasive-belt grinding and polishing machine tool, which solves the problems that the uneven margin can not be stably removed on a curved surface through a vertical six-shaft linkage abrasive-belt grinding and polishing method and overcut and undercut processing can be easily generated in the prior art. The seven-shaft linkage numerical-control abrasive-belt grinding and polishing machine tool comprises a rotary clamp and a tip, wherein the rotary clamp and the tip are used for fixing a blade part; the machine tool further comprises a horizontal machine tool body, an upright, a Y-direction moving device, a Z-direction moving device, an X-direction moving device, a B-direction rotary driving device and a grinding and polishing device, wherein the upright is driven to realize Y-direction linear motion by the Y-direction moving device, the upright is driven to realize Z-direction linear motion by the Z-direction moving device, the X-direction moving device is used for fixing the tip and drives the tip to realize the X-direction linear motion, the B-direction rotary driving device is used for fixing the rotary clamp and driving the rotary clamp to realize 360-degree rotary motion, and the grinding and polishing device is arranged on the horizontal machine tool body corresponding to the upright. Through the above scheme, the seven-shaft linkage numerical-control abrasive-belt grinding and polishing machine tool achieves the aims of more convenient implementation, higher cost performance and higher precision, and is very high in practical value and promotional value.

Description

Seven-axis linkage numerical control abrasive band milling and casting machine tool
Technical field
The utility model relates to a kind of milling and casting machine tool, specifically, relates to a kind of seven-axis linkage numerical control abrasive band milling and casting machine tool that is applicable to the blade class Machining of Curved Surface such as aero-engine, gas turbine, steam turbine.
Background technology
Blade is as the key core part of the power source devices such as aero-engine, gas turbine, steam turbine, service behaviour to complete machine has decisive role, and the accuracy of manufacture of its profile and surface roughness have vital impact to the performance of whole energy conversion apparatus and efficiency.Now, the profile of most blades is complex space curved surfaces, its geometric data is the free form surface obtaining through complicated calculations, analysis and test correction according to fluid mechanics principle, these curved surfaces not only difficulty of processing are large, and working (machining) efficiency is lower, manufacturing cost is higher, so the blade profile that how to produce expeditiously best geometric accuracy and surface roughness has great importance for the efficiency that improves all kinds of energy source and power devices.
At present, China's most enterprises still adopts artificial Manual blades on emery wheel or belt sander, to carry out manual grinding and polishing, and this kind of mode efficiency is very low, and precision is comparatively limited; Mainly contain both at home and abroad for the complex-curved grinding attachment etc. that carries out numerical control abrasive belt grinding machine with six-axis linkage equipment and be applicable to free form surface of blade class, but these equipment relate to that machine tool structure all adopts traditional vertical machining tool structure and on column the vertical unsettled B/C axle double pendulum rotary bistrique of design in cantilever beam mode, carry out X/Y/Z/A/B/C six-axis linkage mode grinding-polishing blade workpiece, there are a plurality of shortcomings:
1, in blade grinding and polishing process, vertical unsettled bistrique B axle back and forth swings back and forth and can cause bistrique weight component to produce unmanageable complex nonlinear Dynamic Effect to the contact in blade grinding district, easily causes to process and cuts or owe the problem of cutting;
2, six-axis linkage abrasive band grinding and polishing mode cannot steady removal curved surface on inhomogeneous surplus problem, as the uneven gauge surplus of finish forge blade edge;
The mode of 3, arranging bistrique on the column of vertical machine mode makes bistrique support in cantilever beam mode, will have a strong impact on its lathe rigidity, and the full depth amount corase grind material that cannot adapt to large surplus blade blank is removed;
4, higher lifting and the dismounting complex process that makes bistrique of the column of vertical machine mode, consuming time longer, is unfavorable for installation and the follow-up maintenance of grinding machine, changes also inconvenience of abrasive band, more uneconomical.
Utility model content
The purpose of this utility model is to provide a kind of seven-axis linkage numerical control abrasive band milling and casting machine tool, mainly solve the vertical six-axis linkage abrasive band grinding and polishing method that exists in prior art cannot steady removal curved surface on inhomogeneous surplus problem and easily produced the problem of owing to cut processing.
To achieve these goals, the technical solution adopted in the utility model is as follows:
Seven-axis linkage numerical control abrasive band milling and casting machine tool, comprise in order to the rotary jig of fixed blade part and top, also comprise horizontal lathe bed, be arranged on horizontal beds column with it, be arranged on it horizontal beds, drive column to realize the straight-line Y-direction telecontrol equipment of Y-direction, be arranged on it horizontal beds, drive column to realize the straight-line Z-direction telecontrol equipment of Z-direction, be arranged on column, in order to stationary center and drive the top straight-line X-direction telecontrol equipment of X-direction of realizing, be arranged on column, in order to fixing rotary jig and drive B that rotary jig realizes 360 degree gyrations to device for revolving and driving, and be arranged on horizontal beds with it with the grinding and polishing apparatus of column corresponding position, described grinding and polishing apparatus comprises bistrique support and is arranged on bistrique support, in order to blade part is carried out to the grinding mechanism of grinding and polishing processing, adopt horizontal mode to be arranged on it horizontal beds, with rotary bistrique support, realize A to the A of gyration to slew gear, be arranged on bistrique support, drive grinding mechanism to realize C to the C swinging to telecontrol equipment, be arranged on bistrique support, drive grinding mechanism to realize N to the N moving to telecontrol equipment.
Specifically, described Y-direction telecontrol equipment comprises along Y-direction and is arranged at horizontal beds guide rail with it, be arranged on the column Y-direction slide unit on guide rail, and be installed on horizontal beds with it, drive column Y-direction slide unit along the Y-axis servomotor of guide rail movement, described column is installed on column Y-direction slide unit.
Described Z-direction telecontrol equipment comprises the Z-direction guide rail being arranged between column Y-direction slide unit and column, is installed on column Y-direction slide unit, drives column along the Z axis servomotor of Z-direction guide rail movement.
Described X-direction telecontrol equipment comprises the X-axis guide rail of at right angle setting side relative to grinding and polishing apparatus on column, by slide block, be installed on the X-direction lifter slide on X-axis guide rail, be installed on column, drive X-direction lifter slide along the X-axis servomotor of X-axis guide rail movement, described top being installed on X-direction lifter slide.
Described B comprises the B axle rotary motion mechanism being installed on column with X-direction lifter slide relative position place to device for revolving and driving, be arranged on the worm and gear in B axle rotary motion mechanism, and driving turbine and worm to realize the B axle servomotor of 360 degree gyrations, described rotary jig is connected with worm and gear.
Described A to slew gear comprise be installed on horizontal beds with it with the arc guide rail at column relative position place, be installed on the revolution back shaft on arc guide rail, be installed on the passive fluted disc of A axle on revolution back shaft, A axle driving gear with the passive fluted disc engagement of A axle, and be arranged on horizontal beds with it, drive A axle driving gear rotate and drive the A axle driven gear that is engaged with around the A axle servomotor that turns round back shaft and move, described bistrique support is installed on the passive fluted disc of A axle.
Described grinding mechanism comprises the bistrique gripper shoe being installed on bistrique support, by grinding head motor installing plate, be installed on the grinding spindle motor in bistrique gripper shoe, all be installed on that T-shaped emery wheel in bistrique gripper shoe supports and transition wheel more than two, regulating wheel, described T-shaped emery wheel supports and is provided with transition wheel, regulating wheel and contact wheel, the transition wheel, regulating wheel and the contact wheel that around this T-shaped emery wheel, support, around abrasive band is installed, are provided with on described grinding spindle motor and the driving wheel that the regulating wheel engagement in this abrasive band is installed.
Described C comprises the C axle driving gear being installed on bistrique support to telecontrol equipment, fan-shaped fluted disc with the engagement of C axle driving gear, the C axle servomotor that drives C axle driving gear to drive fan-shaped fluted disc to swing, be arranged on the hollow shaft in bistrique support, be mounted on the bistrique reversing frame at hollow shaft two ends, described fan-shaped fluted disc is connected with hollow shaft by flat key, and hollow shaft is installed on bistrique cantilever tip by bearing.
Described N comprises N axle servomotor to telecontrol equipment, be arranged on the N shaft ball screw in hollow shaft, be installed on N shaft ball screw and be connected with the N axial filament stem nut of push pedal, and one end is connected with push pedal, the other end supports and locks in anchor ear mode the axle being connected with T-shaped emery wheel through hollow shaft, described N axle servomotor is installed on one end that bistrique reversing frame is fixed on hollow shaft by flange mode, and this N axle servomotor is connected with N shaft ball screw to shaft coupling by N.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model is controlled by the accurate linkage to 7 degree of freedom, realized any complex-curved grinding-polishing, guaranteed to stablize with workpiece contact in curved surface abrasive band in abrasive band grinding and polishing process of large distortion, eliminated the interference of bistrique partical gravity, and can realize the blade profile of non-homogeneous surplus and the quantitative controlled removal of the material at edge completely, thereby further improve blade dimensions precision and surface quality.
(2) the utility model has been realized the uniformity of leaf blade manufacture process, and polishing processing efficiency is high, processing cost is low, grinding head device installation site reasonable, it is simple to safeguard, it is convenient to change abrasive band.
Accompanying drawing explanation
Fig. 1 is seven-axis linkage of the present utility model abrasive band A to, X-direction, Y-direction, N to grinding and polishing principle schematic.
Fig. 2 is that seven-axis linkage of the present utility model abrasive band C is to grinding and polishing principle schematic.
Fig. 3 is that seven-axis linkage of the present utility model abrasive band Z-direction, B are to grinding and polishing principle schematic.
Fig. 4 is front view of the present utility model.
Fig. 5 is the side view of Fig. 4.
Fig. 6 is the top view of Fig. 4.
Fig. 7 is the top view of horizontal lathe bed.
Fig. 8 is the front view of column.
In above-mentioned accompanying drawing, the component names that Reference numeral is corresponding is as follows:
1-blade part, the horizontal lathe bed of 2-, 3-A axle servomotor, 4-A axle driving gear, 5-bistrique support, 6-C axle servomotor, 7-C axle driving gear, the fan-shaped fluted disc of 8-, 9-N axle servomotor, 10-N shaft ball screw, 11-N axial filament stem nut, 12-regulating wheel, 13-grinding spindle motor, 14-abrasive band, 15-push pedal, 16-axle, 17-hollow shaft, 18-bearing, 19-T type emery wheel supports, 20-contact wheel, 21-X axle servomotor, 22-column, 23-B axle rotary motion mechanism, 24-Z axle servomotor, 25-Y axle servomotor, 26-Y shaft ball screw bearing, 27-Y shaft ball screw, 28-column Y-direction slide unit, 29-Z shaft ball screw, 30-Z shaft ball screw nut, 31-X axis rail, 32-X is to shaft coupling, 33-grinding head motor installing plate, 35-bistrique gripper shoe, 36-bistrique reversing frame, 37-B axle servomotor, 38-X is to lifter slide, the passive fluted disc of 40-A axle, 41-arc guide rail, 43-turns round back shaft, 44-guide rail slide block, 45-Y is to shaft coupling, 46-N is to shaft coupling, 47-rotary jig, 48-is top, 49-guide rail, 50-X is to ball screw, 51-X is to screw rodb base, 52-X is to nut, 53-Z direction guiding rail, 54-transition wheel.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, and embodiment of the present utility model includes but not limited to the following example.
As shown in Figure 1, Figure 2 with shown in Fig. 3 and Fig. 4, Fig. 5, Fig. 8, blade part 1 is installed between rotary jig 47 and top 48, rotary jig 47 is arranged on B axle rotary motion mechanism 23, top being arranged on X-direction lifter slide 38, B axle servomotor 37 drives the worm and gear in B axle slew gear to drive rotary jig to realize 360 ° of gyrations.X-direction lifter slide 38 is arranged on column 22 on vertically arranged two X-axis guide rails 31 by slide block, specifically, X-axis servomotor is connected with X-direction ball screw 50, this X-direction ball screw is installed on X-direction screw rodb base 51, and join by X-direction nut 52 and slide block, during use, X-axis servomotor 21 drives X-direction nut 52 to drive the top X-direction rectilinear motion of realizing by X-direction shaft coupling 32.
As shown in Fig. 4, Fig. 5 and Fig. 7, column 22 is arranged on the Z-direction guide rail 53 that column Y-direction slide unit 28 arranges above, and is driven and realized Z-direction rectilinear motion by Z axis servomotor 24; Whole upright column sliding platform is arranged on the guide rail 49 on horizontal lathe bed 2, realizes Y-direction rectilinear motion under the driving of Y-axis servomotor 25.Identical with X-direction telecontrol equipment, Z axis servomotor is also realized and being driven by Z axis ball screw 29, Z axis ball screw nut 30 etc., and Y-axis servomotor is realized and being driven by being arranged at Y-axis ball screw 27 on Y-axis ball screw bearing 26, Y-axis ball screw nut, Y-direction shaft coupling 45 etc.
As shown in Figure 4, grinding spindle motor 13 is connected and fixed by grinding head motor installing plate 33 and bistrique gripper shoe 35, many group transition wheels 54 and regulating wheel 12 are installed in bistrique gripper shoe 35, abrasive band 14 grinding tools support on the contact wheel 20 and transition wheel 54 and regulating wheel 12 forming on 19 around being arranged on by T-shaped emery wheel, and driven and realized high-speed motion by the driving wheel on grinding spindle motor 13, thereby the abrasive particle and blade part 1 surface that make to be coated on abrasive band are carried out CONTACT WITH FRICTION and are produced the grinding-polishing processing main motion of removing its curved-surface materials.
As shown in Figure 6, two Y-direction guide rails 49 that arc guide rail 41 are installed on horizontal lathe bed 2 and are arranged in juxtaposition, on arc guide rail 41, be provided with guide rail slide block 44, on revolution back shaft 43, the passive fluted disc 40 of A axle is installed, A axle servomotor 3 drives 4 rotations of A axle driving gear, and driving the A axle passive tooth wheel disc 40 being engaged with around 43 motions of revolution back shaft, the bistrique support 5 being simultaneously arranged on A axle passive tooth wheel disc drives whole bistrique holder device to realize A to gyration.
As shown in Figure 4 and Figure 6, the C axle servomotor 6 being arranged on bistrique support drives C axle driving gear 7 to drive fan-shaped fluted disc 8 to swing, fan-shaped fluted disc 8 is connected with hollow shaft 17 by flat key, hollow shaft 17 is arranged among the hinge shaft hole on bistrique support 5 tops by bearing 18, bistrique reversing frame 36 is fixed on hollow shaft 17 two ends, thereby realizes bistrique around the C of hollow shaft 17 axial lines to oscillating motion.
As shown in Figure 4, the one end that is fixed on hollow shaft 17 at bistrique reversing frame 36 is provided with N axle servomotor 9 by flange mode, it connects with the N shaft ball screw 10 among being arranged on hollow shaft 17 to shaft coupling 46 by N, N axial filament stem nut 11 on driving N axle ball-screw carries out rectilinear motion, on N axial filament stem nut 11, be connected with push pedal 15, push pedal 15 other ends connect with axle 16, axle 16 supports 19 through hollow shaft 17 and T shape emery wheel and locks and connect in anchor ear mode, thereby realize N axle servomotor, the N of emery wheel is driven to motion.
In when application,, fine sand band thick by changing and hard, soft contact wheel mode just can realize to be switched flexibly to the thick accurately machined technique of spoon of blade, realizes the thick fine finishining of blade parts.
According to above-described embodiment, just can realize well the utility model.

Claims (9)

1. seven-axis linkage numerical control abrasive band milling and casting machine tool, comprise rotary jig (47) and top (48) in order to fixed blade part (1), it is characterized in that, also comprise horizontal lathe bed (2), be arranged on the column (22) on horizontal lathe bed (2), be arranged on horizontal lathe bed (2), drive column (22) to realize the straight-line Y-direction telecontrol equipment of Y-direction, be arranged on horizontal lathe bed (2), drive column (22) to realize the straight-line Z-direction telecontrol equipment of Z-direction, be arranged on column (22), in order to stationary center (48) and drive top (48) to realize the straight-line X-direction telecontrol equipment of X-direction, be arranged on column (22), in order to fixing rotary jig (47) and drive B that rotary jig realizes 360 degree gyrations to device for revolving and driving, and be arranged on horizontal lathe bed (2) and the grinding and polishing apparatus of column (22) corresponding position, described grinding and polishing apparatus comprises bistrique support (5) and is arranged on bistrique support, in order to the grinding mechanism that blade part (1) is carried out to grinding and polishing processing, be arranged on horizontal lathe bed (2), band rotary bistrique support (5) is realized A to the A of gyration to slew gear, be arranged on bistrique support, drive grinding mechanism to realize C to the C swinging to telecontrol equipment, be arranged on bistrique support, drive grinding mechanism to realize N to the N moving to telecontrol equipment.
2. seven-axis linkage numerical control according to claim 1 abrasive band milling and casting machine tool, it is characterized in that, described Y-direction telecontrol equipment comprises along Y-direction and is arranged at the guide rail (49) on horizontal lathe bed (2), be arranged on the column Y-direction slide unit (28) on guide rail (49), and being installed on the Y-axis servomotor (25) that horizontal lathe bed (2) is upper, drive column Y-direction slide unit (28) to move along guide rail (49), described column (22) is installed on column Y-direction slide unit (28).
3. seven-axis linkage numerical control according to claim 2 abrasive band milling and casting machine tool, it is characterized in that, described Z-direction telecontrol equipment comprises the Z-direction guide rail (53) being arranged between column Y-direction slide unit (28) and column (22), is installed on the Z axis servomotor (24) that column Y-direction slide unit (28) is upper, drive column (22) to move along Z-direction guide rail (53).
4. seven-axis linkage numerical control according to claim 3 abrasive band milling and casting machine tool, it is characterized in that, described X-direction telecontrol equipment comprises that at right angle setting is in the X-axis guide rail (31) of the upper side relative to grinding and polishing apparatus of column (22), by slide block, be installed on the X-direction lifter slide (38) on X-axis guide rail (31), be installed on column (22), drive X-direction lifter slide (38) along the X-axis servomotor (21) of X-axis guide rail (31) motion, described top (48) are installed on X-direction lifter slide (38).
5. seven-axis linkage numerical control according to claim 4 abrasive band milling and casting machine tool, it is characterized in that, described B comprises and is installed on column (22) above and the B axle rotary motion mechanism (23) at X-direction lifter slide (38) relative position place to device for revolving and driving, be arranged on the worm and gear in B axle rotary motion mechanism (23), and driving worm and gear to realize the B axle servomotor (37) of 360 degree gyrations, described rotary jig (47) is connected with worm and gear.
6. seven-axis linkage numerical control according to claim 1 abrasive band milling and casting machine tool, it is characterized in that, described A comprises and is installed on horizontal lathe bed (2) above and the arc guide rail (41) at column (22) relative position place to slew gear, be installed on the revolution back shaft (43) on arc guide rail (41), be installed on the passive fluted disc of A axle (40) on revolution back shaft (43), A axle driving gear (4) with the passive fluted disc of A axle (40) engagement, and be arranged on horizontal lathe bed (2), drive A axle driving gear (4) to rotate and drive the A axle driven gear (40) being engaged with around the A axle servomotor (3) that turns round back shaft (43) motion, described bistrique support is installed on the passive fluted disc of A axle (40).
7. seven-axis linkage numerical control according to claim 6 abrasive band milling and casting machine tool, it is characterized in that, described grinding mechanism comprises the bistrique gripper shoe (35) being installed on bistrique support, by grinding head motor installing plate (33), be installed on the grinding spindle motor (13) in bistrique gripper shoe (35), the T-shaped emery wheel being all installed in bistrique gripper shoe (35) supports (19) and transition wheel more than two (54), regulating wheel (12), described T-shaped emery wheel supports on (19) and is provided with transition wheel (54), regulating wheel (12) and contact wheel (20), around this T-shaped emery wheel, support the transition wheel on (19), regulating wheel and contact wheel are around abrasive band (14) is installed, on described grinding spindle motor (13), be provided with the driving wheel with the regulating wheel that this abrasive band (14) are installed (12) engagement.
8. seven-axis linkage numerical control according to claim 7 abrasive band milling and casting machine tool, it is characterized in that, described C comprises the C axle driving gear (7) being installed on bistrique support (5) to telecontrol equipment, fan-shaped fluted disc (8) with C axle driving gear (7) engagement, the C axle servomotor (6) that drives C axle driving gear (7) to drive fan-shaped fluted disc (8) to swing, be arranged on the hollow shaft (17) in bistrique support, be mounted on the bistrique reversing frame (36) at hollow shaft (17) two ends, described fan-shaped fluted disc (8) is connected with hollow shaft (17) by flat key, hollow shaft (17) is installed on bistrique support (5) top by bearing (18).
9. seven-axis linkage numerical control according to claim 8 abrasive band milling and casting machine tool, it is characterized in that, described N comprises N axle servomotor (9) to telecontrol equipment, be arranged on the N shaft ball screw (10) in hollow shaft (17), be installed on N shaft ball screw (10), and be connected with the N axial filament stem nut (11) of push pedal (15), and one end is connected with push pedal (15), the other end supports (19) through hollow shaft (17) with T-shaped emery wheel and in anchor ear mode, locks the axle (16) being connected, described N axle servomotor (9) is installed on bistrique reversing frame (36) by flange mode and is fixed on one end of hollow shaft (17), and this N axle servomotor (9) is connected with N shaft ball screw (10) to shaft coupling (46) by N.
CN201320826632.4U 2013-12-16 2013-12-16 Seven-shaft linkage numerical-control abrasive-belt grinding and polishing machine tool Withdrawn - After Issue CN203579366U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320826632.4U CN203579366U (en) 2013-12-16 2013-12-16 Seven-shaft linkage numerical-control abrasive-belt grinding and polishing machine tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320826632.4U CN203579366U (en) 2013-12-16 2013-12-16 Seven-shaft linkage numerical-control abrasive-belt grinding and polishing machine tool

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103612185A (en) * 2013-12-16 2014-03-05 电子科技大学 Seven-axis linkage numerical control abrasive belt grinding and polishing machine tool
CN105290927A (en) * 2015-09-18 2016-02-03 南京造币有限公司 High-precision arc surface grinding device
CN105290926A (en) * 2014-12-16 2016-02-03 电子科技大学 Blade intelligent grinding flexible manufacturing system
CN107263254A (en) * 2017-06-23 2017-10-20 电子科技大学 Automation grinding machine for navigate hair integrated impeller blade holotype face and vane channel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103612185A (en) * 2013-12-16 2014-03-05 电子科技大学 Seven-axis linkage numerical control abrasive belt grinding and polishing machine tool
CN103612185B (en) * 2013-12-16 2016-08-17 电子科技大学 Seven-axis linkage numerical control abrasive band milling and casting machine tool
CN105290926A (en) * 2014-12-16 2016-02-03 电子科技大学 Blade intelligent grinding flexible manufacturing system
CN105290927A (en) * 2015-09-18 2016-02-03 南京造币有限公司 High-precision arc surface grinding device
CN105290927B (en) * 2015-09-18 2017-10-03 南京造币有限公司 A kind of high accuracy circular cambered surface grinding attachment
CN107263254A (en) * 2017-06-23 2017-10-20 电子科技大学 Automation grinding machine for navigate hair integrated impeller blade holotype face and vane channel

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Granted publication date: 20140507

Effective date of abandoning: 20160817