CN201329455Y - Spiral bevel gear numerically controlled gear grinding machine - Google Patents
Spiral bevel gear numerically controlled gear grinding machine Download PDFInfo
- Publication number
- CN201329455Y CN201329455Y CNU2008201440437U CN200820144043U CN201329455Y CN 201329455 Y CN201329455 Y CN 201329455Y CN U2008201440437 U CNU2008201440437 U CN U2008201440437U CN 200820144043 U CN200820144043 U CN 200820144043U CN 201329455 Y CN201329455 Y CN 201329455Y
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- grinding wheel
- gear
- line slideway
- spindle
- column
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Abstract
The utility model relates to a spiral bevel gear numerically controlled gear grinding machine which comprises a lathe bed. The numerically controlled gear grinding machine is characterized in that the gear grinding machine further comprises an upright post, a grinding wheel headstock, a workpiece headstock, an electric turntable, a grinding wheel correction mechanism and a numerical control system; linear guide rails forming an angle of 90 DEG are arranged on the lathe bed in a horizontal direction; the upright post and a saddle are mounted on the linear guide rails respectively; an upright post automatic travel mechanism is arranged between the bottom part of the upright post and the lathe bed; the linear guide rails and the grinding wheel headstock are arranged on one side surface of the upright post, and a travel mechanism driving the grinding wheel headstock to move is arranged on the same side of the upright post near the top part; the electric turntable is mounted on the saddle; and the workpiece headstock with the grinding wheel correction mechanism mounted thereon is arranged on the electric turntable. The utility model has the advantages that the traditional mechanical transmission is simplified, the machine tool adjustment time is reduced, the structure is compact and reasonable, the processing is accurate with high precision, the degree of automation is high, the processing efficiency is remarkably improved, the manufacture cost is lower, and the economic burden of an enterprise is lessened.
Description
Technical field
The utility model belongs to the gear machine technical field, particularly relates to a kind of spiral bevel gear numerically controlled tooth grinding machine.
Background technology
The spiral bevel gear numerically controlled tooth grinding machine is used at a high speed, grinding spiral bevel gear accurately, its objective is the distortion after the profile shifted gear heat treatment, improves tooth accuracy and fineness, the requirement that reach stable drive, reduces noise and improve precision.Bevel gear pair grinding machine bed in the prior art, its structure mainly includes: lathe bed, three numerical control axles: the grinding wheel spindle (S axle) and the electric control system of cage chair (X-axis), workpiece (Y-axis), saddle (Z axle), employing ac variable frequency speed regulation; The machine adopted variable-frequency motor is as the main driving force source, and cage chair, work spindle drive accurate worm gear by servomotor and drive, and the saddle feeding is driven by ball-screw by servomotor.There is following its defective in above-mentioned gear grinding machines: 1, machine tool structure complexity, and part is many, and manufacturing and assembly difficulty are big, and difficult the adjustment is prone to fault.2, automaticity is low, and efficient is low.3, machining accuracy is low, and labour intensity is big.And import equipment appropriate litigation fees costliness has increased financial burden to enterprise.
At present, along with the fast development of automobile industry, the user presses for the complete set of equipments of bevel gear processing, especially can improve the transmission accuracy of spiral bevel gear and the roll flute machining tool of stationarity.
The utility model content
The utility model provides a kind of full-automatic spiral bevel gear numerically controlled tooth grinding machine, simple and compact for structure, the spiral bevel gear numerically controlled tooth grinding machine that automaticity, machining accuracy and efficient are high for solving the technical problem that exists in the known technology.
The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is: the spiral bevel gear numerically controlled tooth grinding machine, comprise: lathe bed is characterized in that: column, grinding wheel spindle case, workpiece spindle box, electric turntable, emery wheel correction mechanism and digital control system; The lathe bed horizontal direction is provided with 90 ° line slideway each other, and described column is installed on the line slideway, between column bottom and lathe bed the automatic travel mechanism of column that moves along line slideway is housed; The grinding wheel spindle case that column one side is equipped with line slideway and moves up and down along its line slideway, column homonymy are provided with near the top and drive the grinding wheel spindle case along automatic travel mechanism that line slideway moves; Saddle is installed on the lathe bed line slideway and drives saddle along the automatic travel mechanism of saddle that line slideway moves, electric turntable is installed on the saddle, the electricity turntable is provided with the workpiece spindle box that the emery wheel correction mechanism is housed on it, workpiece spindle box inside is provided with work spindle, grinding wheel spindle case inside is provided with grinding wheel spindle and eccentric main axis, and grinding wheel spindle is connected with spindle motor on being installed in the grinding wheel spindle case and by its driving.
The utility model can also adopt following technical scheme:
Described grinding wheel spindle case comprises: casing, the spindle motor that is installed in casing one side is connected with little axle by shaft coupling, little axle is fixed on the casing by forward and backward bearings and by ring flange, in the endoporus of grinding wheel spindle by the forward and backward bearings and the eccentric main axis of packing into, gear is housed on the grinding wheel spindle, this gear and the gears engaged that is installed on the little axle are equipped with emery wheel at the grinding wheel spindle front end by ring flange; Eccentric main axis is installed on the spindle jacket that is positioned at casing by bearings, eccentric main axis one end is equipped with gear, gear is packed on the support set, gear and gears engaged, the eccentric shaft motor is installed in fixing the connecing of casing by flange and puts, on the eccentric shaft motor gear is housed, and passes motion to eccentric main axis by two pairs of meshed gears.
Described workpiece spindle box comprises: casing, on casing, work spindle by forward and backward bearings is installed by ring flange, be equipped with in the work spindle and install piston pulling on it, torque motor is installed in the casing by overcoat, and box back is provided with swivel joint.
Described emery wheel correction mechanism comprises: base and casing, servomotor is connected by the main shaft of shaft coupling with the emery wheel correction mechanism, and be installed on the slide plate by casing, base is provided with guide rail and support, and slide plate is installed on the base by guide rail, slide plate is installed on the slide plate that is positioned on the base, oil cylinder is installed in support, and oil cylinder is installed and is connected with slide plate by support, and oil cylinder drives slide plate and seesaws, oil cylinder drives slide plate and does side-to-side movement, and front-end of spindle is provided with emery wheel.
The automatic travel mechanism that moves along the line slideway road of the setting between described column bottom and the lathe bed comprises: servomotor is connected the nut seat bottom the column with connected ball-screw, ball screw assembly,, nut seat is fixed on the column bottom, and servomotor drives ball-screw moves column before and after line slideway is on lathe bed.
The described driving grinding wheel spindle case that is provided with near the column top comprises along the automatic travel mechanism that line slideway moves: be installed in the servomotor and the connected ball-screw of column one upper lateral part, servomotor drives ball-screw moves up and down the grinding wheel spindle case on line slideway.
The described automatic travel mechanism of saddle that moves along the lathe bed line slideway comprises: servomotor and connected ball-screw, servomotor drive ball-screw and realize that saddle seesaws on lathe bed along line slideway.
Advantage and the good effect that the utlity model has are: the utility model is realized the rectilinear motion of three mutually perpendicular directions by being arranged on the lathe bed automatic travel mechanism that 90 ° driving column horizontal direction each other moves back and forth, driving the automatic travel mechanism that saddle and workpiece spindle box horizontal direction move back and forth and driving three linear axis of the automatic travel mechanism that the grinding wheel spindle case moves up and down along column one side; And by be installed in grinding wheel spindle in the grinding wheel spindle case, be arranged on work spindle in the workpiece spindle box and electric turntable three gyroaxises, be installed in eccentric main axis in the grinding wheel spindle case and emery wheel correction mechanism numerical control main axle and finish grinding spiral bevel gear by digital control system.In addition, owing in the grinding wheel spindle case eccentric main axis is set, major advantage is the spiral bevel gear bull wheel that tooth processing is drawn in available direct plunge method grinding.Workpiece spindle box adopts built-in torque motor, has saved the worm and gear transmission and can make its structure more compact and improve its precision.Between saddle and workpiece spindle box, adopt electric turntable structure, changed the sliding friction that produces when adopting arc-shaped guide rail to rotate in the known technology big, rotate unsettled shortcoming, can guarantee the stationarity that workpiece spindle box rotates, improve grinding accuracy greatly.The utility model also has following advantage: 1, can simplify traditional machine driving, shorten lathe and adjust the time; 2, machine tool structure compact and reasonable, processing is accurate, precision is high.3, automaticity height obviously improves working (machining) efficiency.4, manufacturing cost is lower, has alleviated the business economic burden.
Description of drawings
Fig. 1 is the utility model perspective view;
Fig. 2 is Fig. 1 medium plain emery wheel main spindle box cutaway view;
Fig. 3 is a workpiece spindle box cutaway view among Fig. 1;
Fig. 4 is Fig. 1 medium plain emery wheel correction mechanism perspective view.
Among the figure: 100: lathe bed;
101, servomotor; 102, ball-screw; 103, line slideway; 104, servomotor;
105, ball-screw; 106, line slideway;
200, column;
201, servomotor; 202, ball-screw; 203, line slideway;
300, grinding wheel spindle case;
301, spindle motor; 302, shaft coupling; 303, fore bearing; 304, little axle; 305, ring flange; 306, rear bearing; 307, gear; 308, gear; 309, fore bearing; 310, casing; 311, grinding wheel spindle; 312, rear bearing; 313, eccentric shaft motor; 314, gear; 315, gear; 316, gear; 317, gear; 318, screw; 319, support set; 320, screw; 321: bearing; 322, eccentric main axis; 323, spindle jacket; 324, bearing; 325, ring flange; 326; Ring flange, 327; Connect cover,
400, workpiece spindle box
401, bearing; 402, work spindle; 403, ring flange; 404, torque motor; 405, piston; 406, pull bar; 407, swivel joint; 408, casing; 409: overcoat;
500, emery wheel correction mechanism
501, servomotor; 502, shaft coupling; 503, main shaft; 504, emery wheel; 505, oil cylinder; 506, slide plate; 507, oil cylinder; 508 slide plates; 509: casing; 510, base; 511, support; 512, guide rail; 513, support;
600, electric turntable; 700, saddle.
The specific embodiment
For further understanding utility model content of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:
See also Fig. 1-Fig. 4, the spiral bevel gear numerically controlled tooth grinding machine comprises: lathe bed 100 is characterized in that: column 200, grinding wheel spindle case 300, workpiece spindle box 400, electric turntable 600, emery wheel correction mechanism 500 and digital control system; Lathe bed 100 is provided with horizontal direction 90 ° line slideway 103 and line slideway 106 each other, and described column 200 is installed on the line slideway 103, between column bottom and lathe bed the automatic travel mechanism of column that moves along line slideway 103 is housed; The grinding wheel spindle case 300 that column one side is equipped with line slideway 203 and moves up and down along its line slideway, column homonymy are provided with near the top and drive the grinding wheel spindle case along automatic travel mechanism that line slideway 203 moves; Saddle 700 is installed on lathe bed line slideway 106 and drives saddle along the automatic travel mechanism of saddle that line slideway moves, electric turntable 600 is installed on the saddle, the electricity turntable is provided with the workpiece spindle box 400 that emery wheel correction mechanism 500 is housed on it, workpiece spindle box inside is provided with work spindle 402, grinding wheel spindle case inside is provided with grinding wheel spindle 311 and eccentric main axis 322, and grinding wheel spindle 311 is connected with spindle motor 301 on being installed in the grinding wheel spindle case and by its driving.
See also Fig. 2, described grinding wheel spindle case 300 comprises: casing 310, the spindle motor 301 that is installed in casing one side is connected with little axle (304) by shaft coupling 302, little axle is supported and is fixed on the casing by ring flange 305 by fore bearing 303 and rear bearing 306, in the endoporus of grinding wheel spindle 311 by fore bearing 309 and rear bearing 312 supports and the eccentric main axis 322 of packing into, gear 308 is housed on the grinding wheel spindle, this gear and gear 307 engagements that are installed on the little axle are equipped with emery wheel 326 at the grinding wheel spindle front end by ring flange 325; Eccentric main axis 322 supports by bearing 321 and bearing 324 and is installed on the spindle jacket 323 that is positioned at casing, eccentric main axis one end is equipped with gear 317 by screw 318, gear 316 is packed on the support set 319 by screw 320, gear 317 and gear 316 engagements, eccentric shaft motor 313 is installed in and casing 310 fixing connecing on the cover 326 by flange 327, gear 314 and 315 are housed on the eccentric shaft motor 313, and pass motion to eccentric main axis 322 by two pairs of meshed gears 314, gear 315 and gear 316, gear 317.The main effect of eccentric main axis is can be driven by eccentric main axis to make eccentric rotary when grinding wheel spindle rotates, realizes drawing with direct plunge method grinding the processing of the spiral bevel gear bull wheel of tooth processing.
See also Fig. 3, described workpiece spindle box 400 comprises: casing 408, on casing, the work spindle 402 that is supported by forward and backward bearing 401 is installed by ring flange 403, the pull bar 406 that installs piston 405 on it is installed in work spindle, built-in torque motor 404 is installed in the casing by overcoat 409, and box back is provided with swivel joint 407.By HYDRAULIC CONTROL SYSTEM piston move left and right, realized clamping to workpiece thereby drive about pull bar with moved further.
See also Fig. 4, described emery wheel correction mechanism 500 comprises: base 510 and casing 509, servomotor 501 is connected with the main shaft 503 of emery wheel correction mechanism by shaft coupling 502, and be installed on the slide plate 506 by casing 509, base 510 is provided with guide rail 512 and support 511, slide plate 508 is installed on the base by guide rail 512, slide plate 506 is installed on the slide plate 508, oil cylinder 505 is installed in support 511, oil cylinder 507 is installed by support 513 and is connected with slide plate 506, oil cylinder 505 drives slide plate 506 and seesaws, and oil cylinder 507 drives slide plate 508 and does side-to-side movement, and front-end of spindle is provided with emery wheel 504.
The automatic travel mechanism that moves along line slideway road 103 of the setting between described column bottom and the lathe bed comprises: servomotor 101 is connected the nut seat bottom the column with connected ball-screw 102, ball screw assembly,, nut seat is fixed on column 200 bottoms, and servomotor drives ball-screw 102 moves column before and after line slideway 103 is on lathe bed.
The described driving grinding wheel spindle case that is provided with near the column top comprises along the automatic travel mechanism that line slideway 203 moves: be installed in the servomotor 201 and the connected ball-screw 202 of column 200 1 upper lateral parts, servomotor drives ball-screw 102 moves up and down grinding wheel spindle case 300 on line slideway 203.
The described automatic travel mechanism of saddle that moves along lathe bed 100 line slideways 106 comprises: servomotor 104 and connected ball-screw 105, servomotor drive ball-screw and realize that saddle 700 seesaws on lathe bed along line slideway 106.
The utility model is realized the rectilinear motion of three mutually perpendicular directions by being arranged on the lathe bed horizontal direction automatic travel mechanism that 90 ° driving column horizontal direction each other moves back and forth, driving the automatic travel mechanism that saddle and workpiece spindle box horizontal direction move back and forth and driving three linear axis of the automatic travel mechanism that the grinding wheel spindle case moves up and down along column one side; And by be installed in grinding wheel spindle in the grinding wheel spindle case, be arranged on work spindle in the workpiece spindle box and electric turntable three gyroaxises, be installed in eccentric main axis in the grinding wheel spindle case and emery wheel correction mechanism numerical control main axle and finish grinding spiral bevel gear by digital control system.
Claims (7)
1. spiral bevel gear numerically controlled tooth grinding machine, comprising: lathe bed (100) is characterized in that: also comprise: column (200), grinding wheel spindle case (300), workpiece spindle box (400), electric turntable (600), emery wheel correction mechanism (500) and digital control system; Lathe bed (100) horizontal direction is provided with 90 ° line slideway (103) and line slideway (106) each other, described column (200) is installed on the line slideway (103), between column bottom and lathe bed the automatic travel mechanism of column that moves along line slideway (103) is housed; The grinding wheel spindle case (300) that column one side is equipped with line slideway (203) and moves up and down along its line slideway, column homonymy are provided with near the top and drive the grinding wheel spindle case along the mobile automatic travel mechanism of line slideway (203); Saddle (700) is installed on lathe bed line slideway (106) and drives saddle along the automatic travel mechanism of saddle that line slideway moves, electric turntable (600) is installed on the saddle, the electricity turntable is provided with the workpiece spindle box (400) that emery wheel correction mechanism (500) are housed on it, workpiece spindle box inside is provided with work spindle (402), grinding wheel spindle case inside is provided with grinding wheel spindle (311) and eccentric main axis (322), and grinding wheel spindle (311) is connected with spindle motor (301) on being installed in the grinding wheel spindle case and by its driving.
2. spiral bevel gear numerically controlled tooth grinding machine according to claim 1, it is characterized in that: described grinding wheel spindle case (300) comprising: casing (310), the spindle motor (301) that is installed in casing one side is connected with little axle (304) by shaft coupling (302), little axle is supported and is fixed on the casing by ring flange (305) by fore bearing (303) and rear bearing (306), grinding wheel spindle (311) support by fore bearing (309) and rear bearing (312) and the endoporus of the eccentric main axis of packing into (322) in, gear (308) is housed on the grinding wheel spindle, this gear and gear (307) engagement that is installed on the little axle are equipped with emery wheel (326) at the grinding wheel spindle front end by ring flange (325); Eccentric main axis (322) supports by bearing (321) and bearing (324) and is installed on the spindle jacket (323) that is positioned at casing, eccentric main axis one end is equipped with gear (317), gear (316) is packed on the support set (319), gear (317) and gear (316) engagement, eccentric shaft motor (313) is installed in and fixing the connecing on the cover (326) of casing (310) by flange (327), gear (314) and (315) are housed on the eccentric shaft motor (313), and by two pairs of meshed gears (314), gear (315) and gear (316), gear (317) passes motion to eccentric main axis (322).
3. spiral bevel gear numerically controlled tooth grinding machine according to claim 1, it is characterized in that: described workpiece spindle box (400) comprising: casing (408), on casing, the work spindle (402) that is supported by forward and backward bearing (401) is installed by ring flange (403), the pull bar (406) that installs piston (405) on it is installed in work spindle, torque motor (404) is installed in the casing by overcoat (409), and box back is provided with swivel joint (407).
4. spiral bevel gear numerically controlled tooth grinding machine according to claim 1, it is characterized in that: described emery wheel correction mechanism (500) comprising: base (510) and casing (509), servomotor (501) is connected with the main shaft (503) of emery wheel correction mechanism by shaft coupling (502), and be installed on the slide plate (506) by casing (509), base (510) is provided with guide rail (512) and support (511), slide plate (508) is installed on the base by guide rail (512), slide plate (506) is installed on the slide plate (508), oil cylinder (505) is installed in support (511), oil cylinder (507) is installed by support (513) and is connected with slide plate (506), oil cylinder (505) drives slide plate (506) and seesaws, oil cylinder (507) drives slide plate (508) and does side-to-side movement, and front-end of spindle is provided with emery wheel (504).
5. spiral bevel gear numerically controlled tooth grinding machine according to claim 1, it is characterized in that: automatic travel mechanism that moves along line slideway road (103) of the setting between described column bottom and the lathe bed comprises: servomotor (101) is connected the nut seat bottom the column with connected ball-screw (102), ball screw assembly,, nut seat is fixed on column (200) bottom, and servomotor drives ball-screw (102) moves column before and after line slideway (103) is on lathe bed.
6. spiral bevel gear numerically controlled tooth grinding machine according to claim 1, it is characterized in that: the described driving grinding wheel spindle case that is provided with near the column top comprises along the automatic travel mechanism that line slideway (203) moves: be installed in the servomotor (201) and the connected ball-screw (202) of column (200) one upper lateral parts, servomotor drives ball-screw (102) moves up and down grinding wheel spindle case (300) on line slideway (203).
7. spiral bevel gear numerically controlled tooth grinding machine according to claim 1, it is characterized in that: the described automatic travel mechanism of saddle that moves along lathe bed (100) line slideway (106) comprises: servomotor (104) and connected ball-screw (105), servomotor drive ball-screw and realize that saddle (700) seesaws on lathe bed along line slideway (106).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201440437U CN201329455Y (en) | 2008-12-09 | 2008-12-09 | Spiral bevel gear numerically controlled gear grinding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201440437U CN201329455Y (en) | 2008-12-09 | 2008-12-09 | Spiral bevel gear numerically controlled gear grinding machine |
Publications (1)
| Publication Number | Publication Date |
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| CN201329455Y true CN201329455Y (en) | 2009-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201440437U Expired - Lifetime CN201329455Y (en) | 2008-12-09 | 2008-12-09 | Spiral bevel gear numerically controlled gear grinding machine |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433983B (en) * | 2008-12-09 | 2010-09-29 | 天津第一机床总厂 | Numerical control tooth grinder for spiral bevel gear |
| CN104057396A (en) * | 2014-05-22 | 2014-09-24 | 北京航空航天大学 | Grinding wheel numerically-controlled finishing control device and control method special for face gear grinding |
| CN104097147A (en) * | 2014-06-24 | 2014-10-15 | 北京中研信福传动技术有限公司 | Grinding wheel dresser for surface gear grinding machine |
| CN105817998A (en) * | 2016-05-31 | 2016-08-03 | 山东工商学院 | Grinding wheel finishing device, grinding machine with device and method |
| CN107775460A (en) * | 2017-11-22 | 2018-03-09 | 浙江丰立智能科技股份有限公司 | A kind of workpiece established angle alignment device of small mode number spiral bevel gear milling cutter blade milling machine |
| CN109175544A (en) * | 2018-11-20 | 2019-01-11 | 宝鸡虢西磨棱机制造有限公司 | A kind of curved-tooth bevel gear radiusing machine |
| CN109277586A (en) * | 2018-08-14 | 2019-01-29 | 哈工大机器人（合肥）国际创新研究院 | A kind of main axle structure of zero overhanging center of gravity driving |
| CN109317765A (en) * | 2018-11-20 | 2019-02-12 | 宝鸡虢西磨棱机制造有限公司 | A kind of mobile work platform curved-tooth bevel gear radiusing machine |
| CN111230227A (en) * | 2020-02-04 | 2020-06-05 | 江西理工大学 | Gear hobbing machine dividing head connecting device and bevel gear machining device |
-
2008
- 2008-12-09 CN CNU2008201440437U patent/CN201329455Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433983B (en) * | 2008-12-09 | 2010-09-29 | 天津第一机床总厂 | Numerical control tooth grinder for spiral bevel gear |
| CN104057396A (en) * | 2014-05-22 | 2014-09-24 | 北京航空航天大学 | Grinding wheel numerically-controlled finishing control device and control method special for face gear grinding |
| CN104097147A (en) * | 2014-06-24 | 2014-10-15 | 北京中研信福传动技术有限公司 | Grinding wheel dresser for surface gear grinding machine |
| CN105817998A (en) * | 2016-05-31 | 2016-08-03 | 山东工商学院 | Grinding wheel finishing device, grinding machine with device and method |
| CN107775460A (en) * | 2017-11-22 | 2018-03-09 | 浙江丰立智能科技股份有限公司 | A kind of workpiece established angle alignment device of small mode number spiral bevel gear milling cutter blade milling machine |
| CN107775460B (en) * | 2017-11-22 | 2023-12-15 | 浙江丰立智能科技股份有限公司 | Workpiece mounting angle alignment device of small-modulus spiral bevel gear milling cutter edge grinder |
| CN109277586A (en) * | 2018-08-14 | 2019-01-29 | 哈工大机器人（合肥）国际创新研究院 | A kind of main axle structure of zero overhanging center of gravity driving |
| CN109175544A (en) * | 2018-11-20 | 2019-01-11 | 宝鸡虢西磨棱机制造有限公司 | A kind of curved-tooth bevel gear radiusing machine |
| CN109317765A (en) * | 2018-11-20 | 2019-02-12 | 宝鸡虢西磨棱机制造有限公司 | A kind of mobile work platform curved-tooth bevel gear radiusing machine |
| CN111230227A (en) * | 2020-02-04 | 2020-06-05 | 江西理工大学 | Gear hobbing machine dividing head connecting device and bevel gear machining device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20091021 Effective date of abandoning: 20081209 |