CN202763385U - Multistage cylinder barrel machine tool - Google Patents
Multistage cylinder barrel machine tool Download PDFInfo
- Publication number
- CN202763385U CN202763385U CN201220503454.7U CN201220503454U CN202763385U CN 202763385 U CN202763385 U CN 202763385U CN 201220503454 U CN201220503454 U CN 201220503454U CN 202763385 U CN202763385 U CN 202763385U
- Authority
- CN
- China
- Prior art keywords
- main shaft
- cylinder barrel
- machining tool
- secondary main
- centre frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Machine Tool Units (AREA)
Abstract
The utility model discloses a multistage cylinder barrel machine tool which comprises a body, a main spindle, an auxiliary spindle, a main spindle driving device and an auxiliary spindle driving device. The main spindle and the auxiliary spindle are oppositely arranged at the head and the tail of the body, the main spindle driving device and the auxiliary spindle driving device are respectively matched with the main spindle and the auxiliary spindle, two tool turrets are respectively arranged at machining positions corresponding to the main spindle and the auxiliary spindle, and a center frame capable of moving synchronously together with the auxiliary spindle along a guide rail of the body is arranged in the middle of the body. Machining precision is easy to guarantee by the multistage cylinder barrel machine tool.
Description
Technical field
The utility model relates to a kind of metal cutting machining tool, especially relates to a kind of special purpose machine tool to multistage cylinder barrel processing.
Background technology
At present, prior art is to use oil cylinder processing numerically controlled lathe processing jack cylinder barrel, and typical process is: the two support of main spindle chuck and secondary spindle chuck inner hole of cylinder, processing hydraulic centering center rest frame mouth, centre frame holding frame mouth, secondary main shaft retreats, hydraulic turret processing right-hand member inner stopper.The auxiliary main shaft of machine tool rotation is random movement method, it is servo move mode that Z-direction moves, centre frame moves through the tool rest carriage extension mode of drawing and realizes that Z-direction moves, therefore, existing cylinder body process technology can only be processed bore portion in the cylinder barrel right-hand member, during the processing left end, the workpiece tune also needs secondary clamping, secondary clamping presss from both sides that not only efficient is low, and again clamping and for the first time the location uniformity between clamping be difficult to guarantee that its machining accuracy and processing beat can not satisfy the requirement of multi-stage oil cylinder manufacture field far away.
Summary of the invention
Because the defective that current Multi-stage cylinder cylinder barrel machining tool machining accuracy is difficult to guarantee, the Multi-stage cylinder cylinder barrel machining tool that provides a kind of machining accuracy to guarantee easily.
The utility model is by the following technical solutions:
A kind of Multi-stage cylinder cylinder barrel machining tool, comprise lathe bed and at lathe bed end to end opposed main shaft and secondary main shaft, and main main shaft driving device and the secondary main shaft driving device of coupling, the Working position that mates main shaft and secondary main shaft respectively arranges a cutter tower, and is provided with described secondary main shaft at the synchronization-moving centre frame of bed ways direction at the lathe bed middle part.
Multi-stage cylinder cylinder barrel machining tool according to said structure, increase centre frame, like this, centre frame together with main shaft, secondary main shaft when the processing Multi-stage cylinder cylinder barrel, replace the clamping state, centre frame is in the clamping state to workpiece all the time, and main shaft carries out clamping to workpiece when the processing work tail end, and when the processing head end, secondary main shaft carries out clamping to workpiece, thereby, remain clamping to workpiece in the process segment.Because on the related pair of main axle machine tool such as this case, main shaft is strictly coaxial with secondary main shaft, the error of twice clamping depends on clamping itself, centre frame is in the clamping state all the time in the conversion of twice clamping of machining tool that adopts the utility model said structure, and two main shafts are strictly coaxial, consist of the clamped one time of essence, and the error that the conversion clamping produces can not affect machining accuracy, therefore, its whole machining accuracy has significantly raising.
In addition, the conversion clamping only is the action of two main shaft anchor clamps and the action that realizes above-mentioned synchronization-moving device, operates also very easyly, and working (machining) efficiency improves greatly.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool, described centre frame is the hydraulic self-centering centre frame, is mated, main shaft and secondary main shaft are provided with the hydraulic self-centering chuck.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool, described hydraulic self-centering chuck is the three-jaw fluid-pressure self-centering chuck.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool, the claw of described three-jaw fluid-pressure self-centering chuck are fan-shaped soft pawl.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool drives described centre frame and described secondary main shaft and comprises at the synchronization-moving device of bed ways direction and share leading screw and cooperates with this leading screw and be installed in respectively respectively feed screw nut on described secondary main shaft and the centre frame.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool, described shared leading screw is fixedly installed, and corresponding a pair of feed screw nut disposes synchronously driven each servomotor.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool, described centre frame is installed on the bed ways by the center support body, wherein also is provided with one on this center support body and has the work supporting block of adjusting up and down structure.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool, described work supporting block adjust up and down the hydraulic cylinder type structure that structure is hydraulic push rod type.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool, described work supporting block is the V-type carriage.
Above-mentioned Multi-stage cylinder cylinder barrel machining tool, described secondary main shaft is provided with the locking device on bed ways.
Description of drawings
Fig. 1 is the front view according to a kind of Multi-stage cylinder cylinder barrel machining tool of the present utility model.
Fig. 2 is the left view corresponding to Fig. 1.
Fig. 3 is the right view corresponding to Fig. 1.
Fig. 4 is a kind of hydraulic self-centering centre frame left view.
Fig. 5 is a kind of hydraulic self-centering centre frame front view.
Fig. 6 is a kind of secondary main shaft right view.
Fig. 7 is a kind of secondary main shaft front view.
Fig. 8 is the A-A cutaway view corresponding to Fig. 6.
Among the figure: 1. main motor bent plate, 2. frequency conversion master motor, 3. main shaft, 4. three-jaw fluid-pressure self-centering chuck, 5. cylinder barrel, 6. hydraulic tool rest, 7. saddle, 8. Z axis ball-screw, 9. hydraulic tool rest 10. saddles, 11.U the W axle shares ball-screw, 12.U axle servomotor, 13. the center support body, 14. workpiece hydraulic brackets, 15. hydraulic self-centering centre frames, 16. secondary main shaft three-jaw fluid-pressure chucks, 17. secondary main shaft, 18. secondary main shaft master motors, 19. U, the W axle shares ball-screw, 20.W the axle servomotor, 21. lathe beds, 22. feeding motors, 23a. supercharging is plate, the 23b. supercharging is plate, 24. minutes oil clots, 25. feed screw nut, 26. electric machine support, 27. adjust plate, 28. feed screw nuts, 29. tooth form synchronous belt, 30a. supercharging is plate, the 30b. supercharging is plate, 31. feed screw nuts.
The specific embodiment
With reference to a kind of Multi-stage cylinder cylinder barrel machining tool shown in the Figure of description 1 to 3, it comprises lathe bed 21 and at lathe bed end to end opposed main shaft 3 and secondary main shaft 17, and main main shaft driving device and the secondary main shaft driving device of coupling, the Working position that mates main shaft and secondary main shaft respectively arranges a cutter tower, and is provided with described secondary main shaft at the synchronization-moving centre frame of bed ways direction at the lathe bed middle part.
As shown in Figure 1, two loftier parts installing on the lathe bed are saddle 7 and saddle 10, and a hydraulic tool rest respectively is installed on two saddles, and such as hydraulic tool rest 6, thereby two cover cutters are used for the processing at Multi-stage cylinder cylinder barrel two ends.
In said structure, should know, the configuration of some routines is omitted on the Multi-stage cylinder cylinder barrel process equipment, what those skilled in the art should be understood that knows, such as planker feed system, Hydraulic Station, cooling system, lubricating system, directing station etc., certainly, wherein some configurations may not be applied on the corresponding lathe fully.
Secondary main shaft 17 as shown in Figure 3, its rotary power is by servo main driven by motor, auxiliary main shaft master motor 18 as shown in Figure 3, secondary main axle moving is by the feeding driven by motor, W axle servomotor 20 as shown in Figure 3.The centre frame SERVO CONTROL, but crawl, programming are mobile.
Process is described: workpiece, and the cylinder barrel among Fig. 15 namely, by main shaft 3, the two support of secondary main shaft 17 cylinder barrel Special Fixture for Machining endoporus, various these type of special fixtures are more general being applied in the oil cylinder processing, do not repeat them here.
Then left and right sides hydraulic tool rest 6,9 is processed respectively cylinder barrel two ends frame mouth, centre frame clamping right-hand member frame mouth, and secondary main shaft 17 retreats, main shaft rotation, right hydraulic tool rest 9 processing cylinder barrels 5 right-hand member inner stoppers, groove; Secondary main shaft 17 advances, inner support cylinder barrel 5 endoporus, centre frame unclamps right-hand member frame mouth position, clamping left end frame mouth advances, corresponding anchor clamps unclamp, centre frame and the secondary main shaft 17 common holding workpieces auto lock to the desired location that moves to right synchronously, secondary main shaft 17 rotations, left hydraulic tool rest 6 processing work left end inner stoppers, groove.So far, finish the processing of cylinder barrel 5 two ends endoporus inner stoppers, screw thread, groove.
According to seeming method shown in the such scheme as can be known, by increasing the servo locomotive function of centre frame, can realize cylinder barrel 5 two ends inner stoppers, groove clamped one time, finish the processing at two ends; By the increase double tool rest, and be that left hydraulic tool rest 6 has dorsad working ability, can effectively improve working (machining) efficiency.
Described centre frame is hydraulic self-centering centre frame 15, is mated, and main shaft 3 and secondary main shaft 17 are provided with the hydraulic self-centering chuck, by hydraulic control, finishes easily and fast clamping and the loose frame of workpiece.
Should know that those skilled in the art can adopt other, such as mechanical clamp, lock and the pine folder by mechanical control method, can also dispose electronic control mode.But machine tool field adopts hydraulic way to realize clamping more now, and power density is large, and self has buffer capacity, and is good to the protectiveness of system, and reliable operation, and defective is to produce leakage of oil, but this leakage of oil can't affect the reliable use of lathe.
Preferably, described hydraulic self-centering chuck is the three-jaw fluid-pressure self-centering chuck, three-jaw fluid-pressure self-centering chuck 4 as shown in fig. 1, secondary main shaft three-jaw fluid-pressure self-centering chuck 16.Whole clamping workpiece adopts self-centering control, reduces human factor, and whole process has equipment program control, reduces the error that human factor causes.
Further, the claw of described three-jaw fluid-pressure self-centering chuck is fan-shaped soft pawl, because adopt the inner support clamping, in order to reduce the damage to inner hole of cylinder, adopts fan-shaped soft pawl, and contact area is large, satisfy do not damage empty in the cylinder barrel in, improve the reliability of clamping.
In structure shown in Figure 1, driving described centre frame and described secondary main shaft 17 comprises at the synchronization-moving device of bed ways direction and shares leading screw and cooperates with this leading screw and be installed in respectively respectively feed screw nut on described secondary main shaft and the centre frame, compact conformation can guarantee the synchronism that two parts move on the bed ways direction simultaneously.
In theory strict synchronously, precision that can holding workpiece processing simultaneously, also can produce preferably protection to the roller on the hydraulic self-centering centre frame, prolong the service life of roller.
Further, described shared leading screw is fixedly installed, thereby, share leading screw, when U as shown in fig. 1, W axle shared ball-screw 11 and be fixedly installed, its support can be adopted the rigid support of multiple spot, guarantees the rigidity of leading screw.Otherwise the leading screw employing can turn when supporting, and such as bearings, the rotating accuracy of bearing can affect machining accuracy, and simultaneously, the bearing clearance can be amplified the leading screw that does not have effectively to support and is out of shape.
Correspondingly, corresponding a pair of feed screw nut disposes synchronously driven each servomotor, such as the U axle servomotor 12 of coupling centre frame among Fig. 1, mates the W axle servomotor 20 of secondary main shaft 17, two servomotors can be controlled respectively relevant feed screw nut action, each other not impact.
Preferably, described centre frame is installed on the bed ways by center support body 13, wherein on this center support body, also be provided with one and have the work supporting block of adjusting up and down structure, the effect of work supporting block is that cylinder barrel 5 is when loading and unloading, play the supplemental support effect, behind the two support of two ends chuck endoporus, work supporting block separates with main shaft by adopting such as the PLC work supporting block a bit of distance that descends.In addition, when workpiece cylinder barrel 5 moved axially, work supporting block can strictly not keep the synchronous precision that does not also affect workpiece with secondary main shaft 17, had so just protected the precision of hydraulic self-centering central frame roller, had prolonged the service life of roller.
It is a kind of relatively more conventional adjustment structure in machinery that work supporting block is adjusted up and down structure, can realize that the structure of linear position adjustment just can be used wherein, such as leading screw, similar helicitic texture, four-bar mechanism.A kind of better selection be described work supporting block adjust up and down the hydraulic cylinder type structure that structure is hydraulic push rod type, workpiece hydraulic bracket 14 as shown in fig. 1, easy to adjust, and good operating stability.
Preferably, described work supporting block is the V-type carriage, and is good to the positioning performance of face of cylinder workpiece.
Described secondary main shaft is provided with the locking device on bed ways, to guarantee the reliability of processing.
In the structure shown in Figure 4 and 5, hydraulic self-centering centre frame 15 is fixed on the center support body 13 by 4 bolts, workpiece hydraulic bracket 14 also is fixed on the center support body 13, to be servomotors 12 by arc toothed Timing Belt drive on the feed screw nut center support body 13 move modes rotates, and finishes the function that moves axially of center support body.
In the secondary main shaft shown in Fig. 6 to 8, secondary main shaft master motor 18 drives secondary main shaft rotation by tooth form synchronous belt 28, and it is to drive feed screw nuts 31 rotations by feeding motor 20 that secondary main shaft 17 moves, secondary principal shaft locking be by supercharging plate 30a, 30b locking.
For making those skilled in the art to the more intuitive understanding of having of foundation said structure, in some processing, the correlation technique parameter of machining tool can be set as follows:
Maximum rotating diameter on the lathe bed: φ 670mm
Maximum rotating diameter on the saddle: φ 550mm
Maximum cutting diameter (dish/axle): φ 630mm/ φ 550mm
The cylinder tube diameter range of work: φ 45-φ 310mm
Cylinder tube processing length scope: 800-2500mm
Centre frame clamping range: φ 45-φ 310mm
Main range of spindle speeds: 35-3500rpm
Main shaft main motor current: 30/37kw
Secondary range of spindle speeds: 35-3500rpm
Secondary main shaft main motor current: 22/26kw
X12/Z12/U/W axle stroke: 320/1520/1600/1600mm
X12/Z12/U/W axle feeding Motor torque: 22/30/12/12NM
X12/Z12/U/W axle fast moving speed: 12/16/12/12m/min
X12/Z12/U/W axle positioning accuracy: 0.012/0.018/0.020/0.020mm
X12/Z12/U/W axle repetitive positioning accuracy: 0.004/0.010/0.010/0.010mm.
Claims (10)
1. Multi-stage cylinder cylinder barrel machining tool, comprise lathe bed (21) and at lathe bed end to end opposed main shaft (3) and secondary main shaft (17), and main main shaft driving device and the secondary main shaft driving device of coupling, it is characterized in that, the Working position that mates main shaft and secondary main shaft respectively arranges a cutter tower, and is provided with described secondary main shaft at the synchronization-moving centre frame of bed ways direction at the lathe bed middle part.
2. Multi-stage cylinder cylinder barrel machining tool according to claim 1 is characterized in that, described centre frame is hydraulic self-centering centre frame (15), is mated, and main shaft (3) and secondary main shaft (17) are provided with the hydraulic self-centering chuck.
3. Multi-stage cylinder cylinder barrel machining tool according to claim 2 is characterized in that, described hydraulic self-centering chuck is the three-jaw fluid-pressure self-centering chuck.
4. Multi-stage cylinder cylinder barrel machining tool according to claim 3 is characterized in that, the claw of described three-jaw fluid-pressure self-centering chuck is fan-shaped soft pawl.
5. according to claim 1 to 4 arbitrary described Multi-stage cylinder cylinder barrel machining tools, it is characterized in that, drive described centre frame and described secondary main shaft (17) and comprise at the synchronization-moving device of bed ways direction and share leading screw and cooperates with this leading screw and be installed in respectively respectively feed screw nut on described secondary main shaft and the centre frame.
6. Multi-stage cylinder cylinder barrel machining tool according to claim 5 is characterized in that, described shared leading screw is fixedly installed, and corresponding a pair of feed screw nut disposes synchronously driven each servomotor.
7. Multi-stage cylinder cylinder barrel machining tool according to claim 5 is characterized in that, described centre frame is installed on the bed ways by center support body (13), wherein also is provided with one on this center support body and has the work supporting block of adjusting up and down structure.
8. Multi-stage cylinder cylinder barrel machining tool according to claim 7 is characterized in that, described work supporting block adjust up and down the hydraulic cylinder type structure that structure is hydraulic push rod type.
9. Multi-stage cylinder cylinder barrel machining tool according to claim 7 is characterized in that, described work supporting block is the V-type carriage.
10. Multi-stage cylinder cylinder barrel machining tool according to claim 1 is characterized in that, described secondary main shaft is provided with the locking device on bed ways.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220503454.7U CN202763385U (en) | 2012-09-29 | 2012-09-29 | Multistage cylinder barrel machine tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220503454.7U CN202763385U (en) | 2012-09-29 | 2012-09-29 | Multistage cylinder barrel machine tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202763385U true CN202763385U (en) | 2013-03-06 |
Family
ID=47769984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220503454.7U Expired - Fee Related CN202763385U (en) | 2012-09-29 | 2012-09-29 | Multistage cylinder barrel machine tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202763385U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104162785A (en) * | 2014-07-28 | 2014-11-26 | 佛山市旭川机械有限公司 | Double-shaft turning and milling combined machine |
| CN105880638A (en) * | 2016-06-16 | 2016-08-24 | 德州德隆(集团)机床有限责任公司 | Numerically controlled lathe for two-head processing of torsion rod and method for processing torsion rod through numerically controlled lathe |
| CN106736619A (en) * | 2017-01-24 | 2017-05-31 | 广州市高品机床有限公司 | A kind of double-head processing machine bed structure |
| CN106736590A (en) * | 2017-01-24 | 2017-05-31 | 广州市高品机床有限公司 | A kind of Multifunction processing machine tool |
| CN107791071A (en) * | 2017-09-26 | 2018-03-13 | 东莞市皓晟实业有限公司 | It is a kind of can adjust automatically spacing Digit Control Machine Tool and its more main shafts, more magazine tool structures |
| CN111168547A (en) * | 2020-01-10 | 2020-05-19 | 大连理工大学 | Device and method for removing carbon deposition on outer wall of long-shaft part |
| CN112192147A (en) * | 2020-09-01 | 2021-01-08 | 山东本图液压科技有限公司 | Internal and external integrated machining process for cylinder barrel of hydraulic oil cylinder |
| CN112974864A (en) * | 2021-03-19 | 2021-06-18 | 江苏博尚工业装备有限公司 | Numerical control full-automatic camshaft double-turret excircle lathe |
| CN113103042A (en) * | 2021-03-19 | 2021-07-13 | 上海航天精密机械研究所 | Automatic clamping method for turning and milling composite processing of thin-wall cabin body facing production line |
-
2012
- 2012-09-29 CN CN201220503454.7U patent/CN202763385U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104162785A (en) * | 2014-07-28 | 2014-11-26 | 佛山市旭川机械有限公司 | Double-shaft turning and milling combined machine |
| CN105880638A (en) * | 2016-06-16 | 2016-08-24 | 德州德隆(集团)机床有限责任公司 | Numerically controlled lathe for two-head processing of torsion rod and method for processing torsion rod through numerically controlled lathe |
| CN106736619A (en) * | 2017-01-24 | 2017-05-31 | 广州市高品机床有限公司 | A kind of double-head processing machine bed structure |
| CN106736590A (en) * | 2017-01-24 | 2017-05-31 | 广州市高品机床有限公司 | A kind of Multifunction processing machine tool |
| CN107791071A (en) * | 2017-09-26 | 2018-03-13 | 东莞市皓晟实业有限公司 | It is a kind of can adjust automatically spacing Digit Control Machine Tool and its more main shafts, more magazine tool structures |
| CN111168547A (en) * | 2020-01-10 | 2020-05-19 | 大连理工大学 | Device and method for removing carbon deposition on outer wall of long-shaft part |
| CN112192147A (en) * | 2020-09-01 | 2021-01-08 | 山东本图液压科技有限公司 | Internal and external integrated machining process for cylinder barrel of hydraulic oil cylinder |
| CN112974864A (en) * | 2021-03-19 | 2021-06-18 | 江苏博尚工业装备有限公司 | Numerical control full-automatic camshaft double-turret excircle lathe |
| CN113103042A (en) * | 2021-03-19 | 2021-07-13 | 上海航天精密机械研究所 | Automatic clamping method for turning and milling composite processing of thin-wall cabin body facing production line |
| CN113103042B (en) * | 2021-03-19 | 2022-03-29 | 上海航天精密机械研究所 | Automatic clamping method for turning and milling composite processing of thin-wall cabin body facing production line |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202763385U (en) | Multistage cylinder barrel machine tool | |
| CN101954501B (en) | Drilling platform of pipe numerical control drilling machine | |
| CN202137405U (en) | Deep hole drilling machine | |
| CN204912965U (en) | Horizontal lathe of screw thread hole is milled simultaneously at large -scale cylinder work piece both ends | |
| CN101954502A (en) | CNC (Computerized Numerical Control) drilling machine for processing pipe fittings | |
| US20040211301A1 (en) | Machine tool assembly | |
| CN102198529A (en) | Deep hole drilling machine | |
| CN202861410U (en) | Numerical control double-end lathe for machining carrier roller shaft | |
| CN103350343A (en) | Numerical control gantry vertical and horizontal combined machining center of combination of tool magazine and main shaft on saddle | |
| CN105880638B (en) | A kind of method of numerically controlled lathe and its processing torsion bar for the processing of torsion bar double end | |
| CN109894631B (en) | Numerical control double-sided lathe of motor shell | |
| CN206047104U (en) | A kind of pair of main shaft slant bed lathe | |
| CN104275507A (en) | Drilling and boring lathe for aluminum truck wheel inclined holes | |
| CN114434152B (en) | Combined machine tool and working method | |
| CN210208675U (en) | Two main shaft double-turret combined machine tools of opposition | |
| CN201684947U (en) | Numerical-control gravure two-headed boring pipe bender | |
| CN201720481U (en) | Numerical-control drilling machine for processing pipe fittings | |
| CN212599188U (en) | Double-rotation center frame screw milling machine | |
| CN201235408Y (en) | Apparatus for machining workpiece with lathe replacing boring mill | |
| CN109158672B (en) | Sliding bearing oil groove machining device and milling machine and method for installing sliding bearing oil groove machining device | |
| CN108907918B (en) | Cylindrical grinding machine | |
| CN216227927U (en) | Horizontal numerical control turn-milling knurling compounding machine | |
| CN211053264U (en) | Double-spindle machine tool | |
| CN115673878A (en) | High-rigidity and high-efficiency machine tool with stepped rails and powerful Y-axis | |
| CN206047647U (en) | A kind of double main shaft special planes suitable for Crankshaft Machining |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130306 Termination date: 20210929 |