CN106734605B - Drawing die - Google Patents
Drawing die Download PDFInfo
- Publication number
- CN106734605B CN106734605B CN201611177780.2A CN201611177780A CN106734605B CN 106734605 B CN106734605 B CN 106734605B CN 201611177780 A CN201611177780 A CN 201611177780A CN 106734605 B CN106734605 B CN 106734605B
- Authority
- CN
- China
- Prior art keywords
- pushing block
- locking
- side pushing
- blank holder
- upper mold
- 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.)
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Links
- 239000000463 material Substances 0.000 claims abstract description 44
- 238000003825 pressing Methods 0.000 claims abstract description 43
- 238000005191 phase separation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/04—Blank holders; Mounting means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
- B21D37/12—Particular guiding equipment, e.g. pliers; Special arrangements for interconnection or cooperation of dies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a kind of drawing dies, it connect including upper mold, upper material pressing core, lower blank holder and with the upper material pressing core and the lower blank holder and for making upper material pressing core and lower blank holder keep opposing stationary locking system when the upper mold starts upper lift, so that product is in force balance state.The drawing die of the present invention, the delay separating action of upper material pressing core and lower blank holder is realized by the way that locking system is arranged, on the one hand the rebound that the side wall of product occurs after external force unloads rapidly can be prevented, on the other hand product can be eliminated when material pressing core is detached with lower blank holder by the risk of top pressure, it can also realize that material pressing core is slowly smoothly detached with lower blank holder after drawing in place, have the characteristics that technology difficulty is low, using effect is good.
Description
Technical field
The invention belongs to Press Tools for Automobiles technical fields, specifically, the present invention relates to a kind of drawing dies.
Background technology
Auto industry makes constant progress, and also proposes increasingly higher demands to body structure.For punching press single-piece
Speech, body structure requires to be embodied in on part function type face, for example requires beam piece sidewall profile angle very little, or even flat
Row, part depth is big and longitudinal type face is not equal deep, matches plus vehicle body and requires the harsh size that side wall proposes so that this like members
Special Sheet Metal Forming Technology must be used.In general, it is raising side wall and upper profile quality, it is necessary to while using upper pushing
Material.However, it is existing up and down simultaneously binder drawing mold structure, when upper mold is lifted, since the power of upper material pressing core is much smaller than
The jack-up power of lower blank holder, product are easy to be deformed during each tool body detaches；And due to being drawn into bottom after, upper mold is
Lift is engraved, such dwell time is short, and product is susceptible to rebound.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, the present invention provides a kind of drawing
Prolong mold, it is therefore an objective to be sprung back after avoiding product from being lifted in upper mold.
In order to solve the above-mentioned technical problem, the technical solution adopted in the present invention is：Drawing die, including upper mold, upper pressure
Expect core, lower blank holder and is connect with the upper material pressing core and the lower blank holder and be used to make when the upper mold starts upper lift
Upper material pressing core keeps opposing stationary locking system with lower blank holder, so that product is in force balance state.
The locking system include the upper locking being connect with the upper material pressing core lead leg and be movably arranged and for
Locking leads the side pushing block that leg provides the active force for making its locking, and side pushing block is connect with the lower blank holder.
After drawing in place, upper mold starts upper lift at once, is set to the upper mold slotting tool in the upper mold to the side pushing block
Position-limiting action is played, so that the upper locking is led leg locking by side pushing block.
There is the upper mold slotting tool drive surface, the side pushing block to have the driven surface contacted with the drive surface, drive surface
It is inclined-plane with driven surface.
The upper locking leads leg, and there is a driving face, the side pushing block to have the follower contacted with the driving face
Face, after drawing in place, upper mold starts upper lift at once, and upper locking is led the driving face of leg and contacted with the follower face of side pushing block,
Apply upward pulling force with offside pushing block.
The driving face and the follower face are the tapered plane being obliquely installed.
The locking system further includes being set on the lower blank holder and for making Qi Yanshui to side pushing block application
Square to mobile active force backhaul cylinder, the upper mold slotting tool in the upper mold lift a distance after, backhaul cylinder
Side pushing block is set to be directed away from the direction movement that locking leads leg, so that upper material pressing core is in the shape that will be detached with lower blank holder
State.
The backhaul cylinder make the side pushing block be directed away from upper locking lead leg direction be moved to extreme position after,
Side pushing block is led leg with upper locking and is completely disengaged, and upper material pressing core is completely disengaged with lower blank holder.
The locking system further includes that the side being set on the lower blank holder pushes away seat, and the side pushing block is movably to set
It is placed in side to push away on seat, the backhaul cylinder is fixedly installed on side and pushes away on seat.
The locking system further includes the first guide pad being set on the lower blank holder and the second guide pad and sets
It is placed in the guide rod being slidably connected on the side pushing block and with the first guide pad, side pushing block is to be slidably connected with the second guide pad.
The drawing die of the present invention is detached by locking system being arranged realizing upper material pressing core with the delay of lower blank holder dynamic
Make, on the other hand the rebound that on the one hand can prevent the side wall of product from occurring after external force unloads rapidly can eliminate binder
Product can also realize that material pressing core delays with lower blank holder in drawing afterwards in place by the risk of top pressure when core is detached with lower blank holder
Slowly it smoothly detaches, has the characteristics that technology difficulty is low, using effect is good.
Description of the drawings
Fig. 1 is the partial sectional view of drawing die of the present invention；
Fig. 2 is the sectional view of locking system；
Fig. 3 is status diagram when drawing die is in drawing in place；
Fig. 4 is the status diagram after drawing die is in drawing in place, when upper mold starts upper lift at once；
Fig. 5 is in the status diagram after upper mold starts upper lift a distance for drawing die；
Fig. 6 is that drawing die be in upper mold and continues upper lift a distance and make side pushing block and upper locking is led after leg completely disengages
Status diagram；
Fig. 7 is that drawing die is in the status diagram after lift in upper mold；
Label in above-mentioned figure is：1, upper nitrogen gas spring；2, upper material pressing core；3, upper locking leads leg；4, side pushing block；5,
One guide pad；6, the second guide pad；7, lower blank holder；8, side pushes away seat；9, backhaul cylinder；10, upper mold slotting tool；11, upper mold；12、
Lower die；13, drive surface；14, driven surface；15, driving face；16, follower face；17, guide rod.
Specific implementation mode
Below against attached drawing, by the description of the embodiment, making to the specific implementation mode of the present invention further details of
Explanation, it is therefore an objective to those skilled in the art be helped to have more complete, accurate and deep reason to the design of the present invention, technical solution
Solution, and contribute to its implementation.
As depicted in figs. 1 and 2, the present invention provides a kind of drawing die, including upper die and lower die, upper nitrogen gas spring 1, on
Material pressing core 2, upper mold slotting tool 10 and lower blank holder 7, upper material pressing core 2 are connect by upper nitrogen gas spring 1 with upper mold, upper nitrogen gas spring 1
For applying the elastic acting force for making it push to upper material pressing core 2, upper mold slotting tool 10 is vertically arranged in upper mold and towards upper
It is stretched out below mould, lower blank holder 7 is set in lower die, and the air-cushion eject-rod being set in lower die can pass the pressure of machine tool air cushion
It is delivered on lower blank holder 7, the pressure-plate-force that lower blank holder 7 is closed with upper material pressing core 2 is provided.Unlike the prior art, in order to
The side wall of solution product is when the rebound and upper material pressing core 2 occurred after external force unloads rapidly is detached with lower blank holder 7 due under
The uplift force of blank holder 7 is excessive and leads to the problem of product is by top pressure, and drawing die of the invention further includes locking system, the lock
Locking apparatus connect with upper material pressing core 2 and lower blank holder 7 and for after drawing in place, upper mold will to start to make binder when upper lift
Core 2 keeps opposing stationary with lower blank holder 7, so that product is in force balance state, to avoid product from being deformed by top pressure, together
When reduce the rebound occurred after side wall is unloaded rapidly due to external force.
As depicted in figs. 1 and 2, locking system includes that the upper locking being fixedly connected with upper material pressing core 2 leads leg 3, fixed setting
In the side on lower blank holder 7 push away seat 8, it is moveable be set to side and push away on seat 8 and for leading the offer of leg 3 to upper locking make its locking
Active force side pushing block 4 and be fixedly installed on side and push away on seat 8 and so that it is moved in the horizontal direction for the application of offside pushing block 4
Active force backhaul cylinder 9.The inside that side pushes away seat 8 has the accommodating cavity for accommodating side pushing block 4, in backhaul cylinder 9 along level side
It is pushed away on seat 8 to side is set to, under the action of backhaul cylinder 9, side pushing block 4 can push away seat 8 and lower blank holder 7 along level relative to side
Direction moves in a straight line.Upper locking leads leg 3 and is fixedly installed on material pressing core 2 and is stretched out towards the lower section of upper material pressing core 2, upper mold
Slotting tool 10 is located at the side that upper locking leads leg 3, and upper mold slotting tool 10 and upper locking are led leg 3 and pushed away respectively with side in one end of side pushing block 4
4 phase separation of block.
As depicted in figs. 1 and 2, upper mold slotting tool 10 has a drive surface 13, and side pushing block 4, which has, to be contacted with the drive surface 13
Driven surface 14, the driven surface 14 in drive surface 13 and side pushing block 4 on upper mold slotting tool 10 is the tapered plane being obliquely installed.Upper mold
The inclined direction of slotting tool 10 and the composition wedge mechanism of side pushing block 4, drive surface 13 and driven surface 14 is towards under the outside of side pushing block 4
Side, which tilts, to be extended so that the upper mold slotting tool 10 pushed can push side pushing block 4 in the horizontal direction towards leading leg 3 close to upper locking
It is moved in direction.The top that side pushes away seat 8 has a through-hole for allowing upper mold slotting tool 10 to pass through, and the through-hole and side push away set in seat 8
Accommodating cavity is connected to, it is ensured that drive surface 13 set by 10 lower end of upper mold slotting tool can with the driven surface 14 set by 4 end of side pushing block
It selective contacts with and detaches.Upper locking, which leads leg 3, has a driving face 15, and side pushing block 4 has to be contacted with the driving face 15
Follower face 16, driving face 15 and follower face 16 are the tapered plane being obliquely installed, and driving face 15, follower face
16, drive surface 13 is parallel with driven surface 14 4, and driven surface 14 and follower face 16 are respectively arranged at one end of side pushing block 4.
When drawing in place after, upper mold starts upper lift at once, and lower blank holder 7 is risen by positice ground effect.Side of the side pushing block 4 by upper mold slotting tool 10
Position-limiting action is pushed away, lifts and is started without lateral displacement, therefore upper locking can be led leg 3 and lockked by side pushing block 4, binder upper in this way
Core 2 pushes down product with lower blank holder 7.Upper mold continues upper lift, and side pushing block 4 starts outside sidesway under the pulling force of backhaul cylinder 9
Dynamic, upper locking leads leg 3 under upper mold drive, starts slowly to detach with lower blank holder 7, when 10 drive surface 13 of upper mold slotting tool completely from
After the left side driven surface 14 for opening side pushing block 4, side pushing block 4 also returns to lateral limit position, at this time upper locking lead leg 3 equally departing from
The follower face 16 of side pushing block 4, material pressing core 2 upper in this way are completely separable with lower blank holder 7.
As depicted in figs. 1 and 2, locking system further includes that the first guide pad 5 and second being set on lower blank holder 7 is oriented to
Block 6 and the guide rod 17 for being set on side pushing block 4 and being slidably connected with the first guide pad 5, the second guide pad 6 are led positioned at first
Between seat 8 is pushed away to block 5 and side, side pushing block 4 is to be slidably connected with the second guide pad 6.Guide rod 17 is set to one end of side pushing block 4
And lead the lower section of leg 3 positioned at upper locking, the first guide pad 5, which is equipped with, allows the pilot hole that guide rod 17 passes through.Side pushing block 4 passes through
One guide pad 5, the second guide pad 6 and side push away seat 8 and are connected with lower blank holder 7, in the vertical direction, side pushing block 4 and lower flanging
Circle 7 keeps being relatively fixed.
As shown in figure 3, drawing die is in drawing state in place.When upper mold pushes, upper mold slotting tool 10 with upper mold simultaneously
It pushes, after 10 lower end drive surface 13 of upper mold slotting tool is contacted with the driven surface 14 of side pushing block 4,10 push side pushing block of upper mold slotting tool, 4 edge
Horizontal direction moves, and in the process, upper locking leads leg 3 and also synchronizes pushing with upper material pressing core 2.When drawing in place after, upper mold insert
Laterally pressure is steady by side pushing block 4 for knife 10, upper locking lead leg 3 driving face 15 be located at side pushing block 4 follower face 16 lower section, connect
Upper mold will gradually upper lift.
As shown in figure 4, after drawing in place, upper mold starts upper lift at once, after lifting a distance on upper mold slotting tool 10, side
Pushing block 4 is directed away from upper locking under the pulling force effect that backhaul cylinder 9 generates and leads the direction linear movement of leg 3 to the left, and locks
Only leading the driving face 15 of leg 3, (sliding-type face applies upward pulling force in upper lift stage offside pushing block 4, therefore is driving face
15) side pushing block 4 is driven, air cushion power is in addition played to be greater than the power of material pressing core 2, to which lower blank holder 7 also moves upwards.
As shown in figure 5, upper mold continues upper lift, upper mold slotting tool 10 also continues upper lift therewith, under the action of backhaul cylinder 9,
Side pushing block 4 continues to be moved to the left, and is continued up to which upper locking leads leg 3, the power of lower blank holder 7 and upper material pressing core 2 is gradual
Close, lower blank holder 7 and upper material pressing core 2 will detach.
As shown in fig. 6, upper mold slotting tool 10 follows upper mold to continue upper lift, under the action of backhaul cylinder 9, side pushing block 4 is to the left
Extreme position is moved to, side pushing block 4 is led leg 3 with upper locking and completely disengaged, and locking system unlocks completely, descends 7 He of blank holder at this time
Upper material pressing core 2 also completely disengages, and so far upper and lower mould is completely disengaged, and product is on drag face only by gravity.
The drawing die of the present invention makes upper material pressing core after drawing in place by the way that locking system is arranged during upper mold lifting
2 with lower blank holder 7 slowly and smoothly detach, to make die face gradually discharge product active force, therefore avoid system
Part is deformed by top pressure and reduces the rebound risk of product.Its working method is：When drawing in place after, upper mold i.e. engrave lift, pushing
Flange 7 is risen by positice ground effect.Side pushing block 4 is pushed away position-limiting action by the side of upper mold slotting tool 10, is lifted and is started without lateral displacement,
Therefore upper locking is led leg 3 to lock, material pressing core 2 upper in this way pushes down product with lower blank holder 7.Upper mold continues upper lift, side pushing block 4
Start to move outward under the pulling force of backhaul cylinder 9, upper locking is led leg 3 and driven by upper mold, starts slowly to divide with lower blank holder 7
From after the drive surface 13 of upper mold slotting tool 10 leaves the left side driven surface 14 of side pushing block 4 completely, side pushing block 4 also returns to outer side pole
Extreme position goes up locking and leads leg 3 equally departing from the follower face 16 of side pushing block 4, goes up material pressing core 2 and lower blank holder 7 so at this time
It is completely separable.
After drawing in place, locking system plays the role of locking in short-term when upper mold is lifted, and subsequent upper mold continuously decreases
Active force on locking system, lateral backhaul cylinder 9 retracts side pushing block 4, while being lifted on lower blank holder 7, machine tool air cushion production
Raw active force tends to be equal with the lower pressure that upper nitrogen gas spring 1 generates, so that above between material pressing core 2 and lower blank holder 7
Active force tend to balance, locking system unlocks completely at this time, and upper material pressing core 2 and lower blank holder 7 just completely disengage, such product
Stress is constantly in equilibrium state after drawing in place, on the one hand realizes pressure slow release, and rebound risk reduces, another party
Face product will not be due to being deformed by top pressure.
The present invention is exemplarily described above in conjunction with attached drawing, it is clear that the present invention implements not by aforesaid way
Limitation, as long as the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress is used, or without changing
Other occasions are directly applied to by the design of the present invention and technical solution, within protection scope of the present invention.
Claims (10)
1. drawing die, including upper mold, upper material pressing core and lower blank holder, which is characterized in that further include with the upper material pressing core and
The lower blank holder connects and for making upper material pressing core and lower blank holder keep opposing stationary when the upper mold starts upper lift
Locking system, so that product is in force balance state；
The locking system includes that the upper locking being connect with the upper material pressing core leads leg and is movably arranged and is used for upper locking
The side pushing block that leg provides the active force for making its locking is led, side pushing block is connect with the lower blank holder；
After drawing in place, upper mold starts upper lift at once, and the upper mold slotting tool being set in the upper mold plays the side pushing block
Position-limiting action, so that the upper locking is led leg locking by side pushing block.
2. drawing die according to claim 1, which is characterized in that the upper mold slotting tool has a drive surface, the side
Pushing block has the driven surface contacted with the drive surface, and drive surface and driven surface are inclined-plane.
3. drawing die according to claim 2, which is characterized in that the inclined direction of the drive surface and driven surface is court
Extend to the outside inclined downward of side pushing block so that the upper mold slotting tool pushed can push side pushing block in the horizontal direction towards close
It is moved in the direction that upper locking leads leg.
4. drawing die according to claim 3, which is characterized in that the upper locking leads leg and is fixedly installed on material pressing core
It above and towards the lower section of upper material pressing core stretches out, upper mold slotting tool is located at the side that upper locking leads leg, and upper mold slotting tool and upper locking lead leg
Respectively in one end of side pushing block and side pushing block phase separation.
5. according to the drawing die described in Claims 2 or 3 or 4, which is characterized in that it is driving with one that the upper locking leads leg
Face, the side pushing block have the follower face contacted with the driving face, and after drawing in place, upper mold starts upper lift at once, on
Locking is led the driving face of leg and is contacted with the follower face of side pushing block, applies upward pulling force with offside pushing block.
6. drawing die according to claim 5, which is characterized in that the driving face and the follower face are to incline
The tapered plane being tiltedly arranged.
7. drawing die according to claim 5, which is characterized in that the locking system further includes being set to the pushing
On flange and for applying the backhaul cylinder for making its active force moved in the horizontal direction to the side pushing block, inserted in the upper mold
After knife in the upper mold with a distance is lifted, backhaul cylinder makes side pushing block be directed away from the direction movement that locking leads leg, so that
Upper material pressing core is in the state that will be detached with lower blank holder.
8. drawing die according to claim 7, which is characterized in that make the side pushing block towards far in the backhaul cylinder
Led from upper locking leg direction be moved to extreme position after, side pushing block is led leg with upper locking and is completely disengaged, upper material pressing core under
Blank holder completely disengages.
9. drawing die according to claim 7, which is characterized in that the locking system further includes being set to the pushing
Side on flange pushes away seat, and the side pushing block is movably to be set to side to push away on seat, and the backhaul cylinder is fixedly installed on side and pushes away
On seat.
10. drawing die according to claim 9, which is characterized in that the locking system further include be set to it is described under
It the first guide pad and the second guide pad on blank holder and is set on the side pushing block and is slidably connected with the first guide pad
Guide rod, side pushing block and the second guide pad are to be slidably connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611177780.2A CN106734605B (en) | 2016-12-19 | 2016-12-19 | Drawing die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611177780.2A CN106734605B (en) | 2016-12-19 | 2016-12-19 | Drawing die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106734605A CN106734605A (en) | 2017-05-31 |
| CN106734605B true CN106734605B (en) | 2018-08-10 |
Family
ID=58890173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611177780.2A Active CN106734605B (en) | 2016-12-19 | 2016-12-19 | Drawing die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106734605B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108687243A (en) * | 2018-04-27 | 2018-10-23 | 吉利汽车研究院（宁波）有限公司 | A kind of mold for realizing blocking function without locking press |
| DE102021201896A1 (en) | 2021-03-01 | 2022-09-01 | Ford-Werke Gmbh | Forming process for a sheet metal part |
| CN114535427B (en) * | 2022-03-10 | 2023-01-17 | 深圳市创辉业金属材料有限公司 | Stamping device of machine case panel beating |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101167720B1 (en) * | 2010-01-13 | 2012-07-20 | 주식회사 신영 | Drawing mold |
| CN202010738U (en) * | 2011-04-02 | 2011-10-19 | 重庆平伟精密模具股份有限公司 | Balance mechanism for upper and lower pressure plates of stamping die |
| CN103071716A (en) * | 2012-12-27 | 2013-05-01 | 吉林大学 | Super-plastic expansion anti-oxidation program control precise loading experiment device and method |
| FR3018708B1 (en) * | 2014-03-20 | 2016-03-25 | Peugeot Citroen Automobiles Sa | TOOLING OF PRESSING PRESS WITH SAFE RISE OF THE CAM SLIDER |
| CN204770220U (en) * | 2015-07-13 | 2015-11-18 | 数码模冲压技术（武汉）有限公司 | Stamping die drawing die structure |
| CN205008475U (en) * | 2015-08-06 | 2016-02-03 | 东风(武汉)实业有限公司 | Stamping workpiece forming die |
-
2016
- 2016-12-19 CN CN201611177780.2A patent/CN106734605B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106734605A (en) | 2017-05-31 |
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