CN109047466A - A kind of stamping die of damping anticracking - Google Patents
A kind of stamping die of damping anticracking Download PDFInfo
- Publication number
- CN109047466A CN109047466A CN201811045874.3A CN201811045874A CN109047466A CN 109047466 A CN109047466 A CN 109047466A CN 201811045874 A CN201811045874 A CN 201811045874A CN 109047466 A CN109047466 A CN 109047466A
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- China
- Prior art keywords
- hole
- block
- cope plate
- rushes
- damping
- 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.)
- Withdrawn
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- 238000013016 damping Methods 0.000 title claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims description 20
- 238000007906 compression Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000004080 punching Methods 0.000 abstract description 33
- 238000010008 shearing Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2238/00—Type of springs or dampers
- F16F2238/02—Springs
- F16F2238/026—Springs wound- or coil-like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Punching Or Piercing (AREA)
Abstract
The invention discloses a kind of stamping dies of damping anticracking, including cope plate and stripper plate, the cope plate lower end is equipped with hole punched device, the hole punched device includes rushing block, the number of blocks that rushes is several, and several rush block and successively install from top to bottom, several described outer diameters for rushing block successively successively decrease from top to bottom, the block lower surface outer that rushes is enclosed with hard alloy sleeve, compared with prior art, the beneficial effects of the present invention are: when pushing punching using hole punched device, minimum outer diameter first rushes block and can go out aperture, what outer diameter was sequentially increased later, which rushes block and act on workpiece, is gradually increased aperture, preventing from once going out biggish hole keeps the shearing force being subject to when punching larger, it causes to generate slight crack in hole, influence processing quality, the hardness of hard alloy sleeve is larger simultaneously, it can guarantee that section is neat in punching, hard simultaneously The service life of alloy sheath is longer.
Description
Technical field
The present invention relates to stamping die technology, specially a kind of stamping die of damping anticracking.
Background technique
Stamping die is that material (metal or nonmetallic) is processed into part (or semi-finished product) in Cold Press Working
A kind of special process equipment, referred to as cold punching die (being commonly called as cold-punching mould), punching press are at room temperature, using being mounted on press machine
On mold to material apply pressure, make its generate separation or plastic deformation, thus obtain needed for part a kind of pressure processing
Method will often use in the punching processing of part and arrive stamping die, but current stamping die is biggish in punching internal diameter
Kong Shi usually be easy to cause the slight crack that generation is certain in hole, influences processing quality since the shearing force in punching is larger, and
And current mold is not fixed firmly to machined part when being punched out and workpiece generates vibration in processing and all be easy to cause
Processing dislocation, so that processing quality is influenced, for this purpose, it is proposed that a kind of stamping die of damping anticracking.
A kind of stamping die of damping anticracking.
Summary of the invention
It is mentioned above in the background art to solve the purpose of the present invention is to provide a kind of stamping die of damping anticracking
Problem.
To achieve the above object, the invention provides the following technical scheme: a kind of stamping die of damping anticracking, including upper mold
Plate and stripper plate, the cope plate lower end are equipped with hole punched device, and the hole punched device includes rushing block, if the number of blocks that rushes is
Dry, and several rush block and successively install from top to bottom, several described outer diameters for rushing block successively successively decrease from top to bottom, the punching
Block lower surface outer is enclosed with hard alloy sleeve, and the cope plate lower end is equipped with fixed device, and the fixed device quantity is
Three, described three fixed devices are identical as cope plate centre distance, and three fixed between device and the cope plate line of centres
It is mutually in 60 degree, three fixed devices can make to be connected firmly between pressure ring and cope plate, while convenient for cope plate on pressure ring
Uniform transmission force；
The fixed device includes external thread rod and pressure ring, and the external thread rod is socketed in first through hole, the first through hole
It is opened on cope plate, the first location nut, the cope plate following table is bolted with outside the external thread rod of the cope plate upper surface
It is bolted with the second location nut outside the external thread rod in face, the screw rod lower end is provided with T-type hole, is socketed with T-type pressure in the T-type hole
Spring is installed, the pressure ring lateral surface is inclined-plane, under the pressure ring in bar, T-type compression bar upper end and T-type hole between upper end
Surface is equipped with rubber pad, and T-type compression bar lower end is hinged on the inclined-plane of the pressure ring lateral surface；
The stripper plate is located at fixed device lower end, and the stripper plate lower end is equipped with lower template, and the stripper plate center is provided with
Second through-hole, the lower template center are provided with third through-hole, and second through-hole is identical as third through-hole aperture and axially bored line exists
On same straight line, the slug after enabling processing is fallen by the second through-hole with third through-hole.
Preferably, the block lower end that rushes is provided with the second tapped blind hole, and the block upper end that rushes is equipped with screw rod, and described up and down two
It is a rush to be screwed onto the second tapped blind hole between block by screw rod be connected, the screw rod that described the top rushes on block is bolted in first
In tapped blind hole, first tapped blind hole is opened in cope plate lower surface.
Preferably, the inclined-plane is horizontal by 45 degree.
Preferably, the height of the hole punched device lower surface is higher than the height of pressure ring lower surface.
Preferably, second through-hole rushes block outer diameter greater than maximum gauge with third through-hole aperture.
Preferably, the lower template lower end is equipped with fixing screws, and the fixing screws pass through lower template and are bolted in de- material
In plate lower surface.
Preferably, the number of blocks that rushes is five.
Compared with prior art, the beneficial effects of the present invention are: including rushing block by hole punched device, it is several for rushing number of blocks
It is a, and several rush block and successively install from top to bottom, several outer diameters for rushing block successively successively decrease from top to bottom, fill using punching
It sets when pushing punching, minimum outer diameter first rushes block and can go out aperture, and the block that rushes that outer diameter is sequentially increased later acts on workpiece
It is gradually increased aperture, preventing from once going out biggish hole keeps the shearing force being subject to when punching larger, it causes to generate slight crack in hole,
Processing quality is influenced, is enclosed with hard alloy sleeve by rushing block lower surface outer, the hardness of hard alloy sleeve is larger, in punching
It can guarantee that section is neat, while the service life of hard alloy sleeve is longer, is socketed in first through hole by external thread rod, the
One through-hole is opened on cope plate, and the first location nut, cope plate lower surface are bolted with outside the external thread rod of cope plate upper surface
External thread rod outside be bolted with the second location nut, enable the first location nut and the second location nut by the position of external thread rod
Fixation is set, while adjusting and dismantling convenient for the position of external thread rod, T-type hole is provided with by screw rod lower end, T-type is socketed with T in hole
Spring is installed between upper end in type compression bar, T-type compression bar upper end and T-type hole, enables cope plate T-type compression bar when moving down
To dynamic compressed spring is moved up in T-type hole, when hole punched device, which constantly moves down punching, increases aperture constantly, spring is acted on
Elastic force on T-type compression bar also constantly increases, and keeps workpiece fixation in lower template more and more secured, prevents vibration of workpiece and shifting
It is dynamic, guarantee punching quality, is inclined-plane by pressure ring lateral surface, pressure ring lower surface is equipped with rubber pad, the inclined-plane of pressure ring lateral surface
On be hinged with T-type compression bar lower end, when acting on the power on T-type compression bar on inclined-plane, pressure, which can be divided into, is horizontally directed to the pressure ring center of circle
Power and vertical lower template power, be horizontally directed to the pressure ring center of circle power can make hole punched device in punching workpiece in circular
The power for being directed toward center of circular hole is generated, prevents circular hole from splitting outward in processing, the power of vertical lower template can be securely solid by workpiece
It is scheduled on stripper plate.
Detailed description of the invention
Fig. 1 is perspective view of the present invention；
Fig. 2 is structure of the invention cross-sectional view；
Fig. 3 is schematic enlarged-scale view at a of the present invention.
In figure: 1, cope plate, the 101, first tapped blind hole, 102, first through hole, 2, hole punched device, 21, rush block, 211,
Two tapped blind holes, 22, hard alloy sleeve, 23, screw rod, 3, fixed device, 31, external thread rod, 311, T-type hole, the 32, first positioning
Nut, the 33, second location nut, 34, spring, 35, T-type compression bar, 36, pressure ring, 361, inclined-plane, 37, rubber pad, 4, stripper plate,
401, the second through-hole, 5, lower template, 501, third through-hole, 6, fixing screws.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-3 is please referred to, the present invention provides a kind of technical solution: a kind of stamping die of damping anticracking, including cope plate 1
With stripper plate 4,1 lower end of cope plate is equipped with hole punched device 2, and the hole punched device 2 includes rushing block 21, described to rush the number of block 21
Amount is several, and several rush block 21 and successively install from top to bottom, and described several rush the outer diameter of block 21 from top to bottom successively
Successively decrease, when pushing punching using hole punched device 2, minimum outer diameter first rushes block 21 and can go out aperture, and outer diameter successively increases later
It is big rush block 21 and act on workpiece be gradually increased aperture, preventing from once going out biggish hole makes the shearing force being subject to when punching
It is larger, it causes to generate slight crack in hole, influences processing quality, the 21 lower surface outer of block that rushes is enclosed with hard alloy sleeve 22, firmly
The hardness of matter alloy sheath 22 is larger, can guarantee that section is neat in punching, while the service life of hard alloy sleeve 22 is longer,
1 lower end of cope plate is equipped with fixed device 3, and fixed 3 quantity of device is three, described three fixed devices 3 with it is upper
1 centre distance of template is identical, and is mutually in 60 degree between three fixed devices 3 and 1 line of centres of cope plate, three fixed devices
3 can make to be connected firmly between pressure ring 36 and cope plate 1, while be convenient for the uniform transmission force on pressure ring 36 of cope plate 1；
The fixed device 3 includes external thread rod 31 and pressure ring 36, and the external thread rod 31 is socketed in first through hole 102, institute
It states first through hole 102 to be opened on cope plate 1, the first positioning spiral shell is bolted with outside the external thread rod 31 of 1 upper surface of cope plate
Mother 32 is bolted with the second location nut 33 outside the external thread rod 31 of 1 lower surface of cope plate, makes the first location nut 32 and the
Two location nuts 33 can fix the position of external thread rod 31, while adjusting and dismantling, institute convenient for the position of external thread rod 31
It states 23 lower end of screw rod and is provided with T-type hole 311, T-type compression bar 35,35 upper end of T-type compression bar and T-type are socketed in the T-type hole 311
Spring 34 is installed between upper end in hole 311, enable cope plate 1 when moving down T-type compression bar 35 in T-type hole 311 to
Dynamic compressed spring 34 is moved up, when hole punched device 2, which constantly moves down punching, increases aperture constantly, spring 34 acts on T-type
Elastic force on compression bar 35 also constantly increases, and keeps workpiece fixation in lower template 5 more and more secured, prevents vibration of workpiece and movement,
Guarantee that punching quality, 36 lateral surface of pressure ring are inclined-plane 361,36 lower surface of pressure ring is equipped with rubber pad 37, the pressure
35 lower end of T-type compression bar, when acting on the power on T-type compression bar 35 on inclined-plane, pressure are hinged on the inclined-plane 361 of 36 lateral surface of ring
The power of the power and vertical lower template 5 that are horizontally directed to 36 center of circle of pressure ring can be divided into, the power for being horizontally directed to 36 center of circle of pressure ring can make to rush
The workpiece in punching of aperture apparatus 2 generates the power for being directed toward center of circular hole in circular, prevents circular hole from splitting outward in processing, hangs down
Workpiece can be fixedly secured on stripper plate 4 by the power of straight lower template 5；
The stripper plate 4 is located at fixed 3 lower end of device, and 4 lower end of stripper plate is equipped with lower template 5,4 center of stripper plate
It is provided with the second through-hole 401,5 center of lower template is provided with third through-hole 501, second through-hole 401 and 501 hole of third through-hole
Diameter is identical and axially bored line on the same line, the slug after enabling processing is fallen by the second through-hole 401 with third through-hole 501
It falls.
Specifically, 21 lower end of block that rushes is provided with the second tapped blind hole 211,21 upper end of block that rushes is equipped with screw rod
23, it is described up and down two rush between block 21 and be screwed onto the second tapped blind hole 211 and be connected by screw rod 23, the top punching
Screw rod 23 on block 21 is bolted in the first tapped blind hole 101, and first tapped blind hole 101 is opened in 1 lower surface of cope plate,
So that several is rushed replacement easy to disassemble between block 21, while the quantity and most favourable opposition for rushing block 21 can be adjusted according to the internal diameter of punching
The outer diameter of block 21.
Specifically, the inclined-plane 361 horizontal by 45 degree, make inclined-plane 361 convenient for generation level with it is vertical
Component.
Specifically, the height of 2 lower surface of hole punched device is higher than the height of 36 lower surface of pressure ring, rushing workpiece
Hole punched device 2 acts on workpiece first when pressure.
Specifically, second through-hole 401 rushes 21 outer diameter of block greater than maximum gauge with 501 aperture of third through-hole, protect
The particle that card punching press is fallen can be fallen by the second through-hole 401 with third through-hole 501.
Specifically, 5 lower end of lower template is equipped with fixing screws 6, the fixing screws 6 pass through lower template 5 and are spirally connected
In in 4 lower surface of stripper plate, de- material is dismantled from lower template 5 convenient for stripper plate 4.
Specifically, 21 quantity of block of rushing is five, allow punching by five punch formings.
Working principle: in the use of the present invention, cope plate 1 is mounted on lathe formed punch lower end, workpiece is mounted on lower die
5 upper end of plate, when cope plate 1, which is moved down, carries out punching press to workpiece, device 3 fixed first can be contacted with workpiece, 36 energy of pressure ring
Workpiece surface is enough pressed in by rubber pad 37, in 2 punching press of hole punched device, minimum outer diameter first rushes block 21 and can go out aperture,
What outer diameter was sequentially increased later, which rushes block 21 and act on workpiece, is gradually increased aperture, and preventing from once going out biggish hole makes punching
When the shearing force that is subject to it is larger, cause to generate slight crack in hole, influence processing quality, while the T-type pressure when moving down of cope plate 1
Bar 35 can keep aperture continuous in T-type hole 311 to dynamic compressed spring 34 is moved up when hole punched device 2 constantly moves down punching
When increase, the elastic force that spring 34 acts on T-type compression bar 35 also constantly increases, and keeps workpiece fixed more and more firm in lower template 5
Gu preventing vibration of workpiece and movement, guarantee punching quality, when the power on T-type compression bar 35 is acted on inclined-plane, pressure can be divided into water
The power of the flat power for being directed toward 36 center of circle of pressure ring and vertical lower template 5, the power for being horizontally directed to 36 center of circle of pressure ring can make hole punched device 2 exist
Workpiece generates the power for being directed toward center of circular hole in circular when punching, prevents circular hole from splitting outward in processing, vertical lower template 5
Power workpiece can be fixedly secured on stripper plate 4.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (7)
1. a kind of stamping die of damping anticracking, including cope plate (1) and stripper plate (4), it is characterised in that: the cope plate
(1) lower end is equipped with hole punched device (2), and the hole punched device (2) includes rushing block (21), and block (21) quantity of rushing is several
It is a, and several rush block (21) and successively install from top to bottom, several described outer diameters for rushing block (21) successively successively decrease from top to bottom,
Described block (21) the lower surface outer that rushes is enclosed with hard alloy sleeve (22), and cope plate (1) lower end is equipped with fixed device
(3), fixed device (3) quantity is three, and described three fixed devices (3) are identical as cope plate (1) centre distance, and three
It is mutually in 60 degree between a fixed device (3) and cope plate (1) line of centres；
The fixed device (3) includes external thread rod (31) and pressure ring (36), and the external thread rod (31) is socketed on first through hole
(102) in, the first through hole (102) is opened on cope plate (1), the external thread rod (31) of cope plate (1) upper surface
It is bolted with the first location nut (32) outside, the second positioning spiral shell is bolted with outside the external thread rod (31) of cope plate (1) lower surface
Female (33), screw rod (23) lower end are provided with T-type hole (311), are socketed with T-type compression bar (35), the T in the T-type hole (311)
It is equipped with spring (34) between type compression bar (35) upper end and T-type hole (311) interior upper end, pressure ring (36) lateral surface is inclined-plane
(361), pressure ring (36) lower surface is equipped with rubber pad (37), hinged on the inclined-plane (361) of pressure ring (36) lateral surface
There is T-type compression bar (35) lower end；
The stripper plate (4) is located at fixed device (3) lower end, and stripper plate (4) lower end is equipped with lower template (5), described de-
Flitch (4) center is provided with the second through-hole (401), and lower template (5) center is provided with third through-hole (501), second through-hole
(401) and axially bored line identical as third through-hole (501) aperture be on the same line.
2. a kind of stamping die of damping anticracking according to claim 1, it is characterised in that: open described block (21) lower end that rushes
Have the second tapped blind hole (211), described block (21) upper end that rushes is equipped with screw rod (23), it is described up and down two rush between block (21) lead to
It crosses screw rod (23) and is screwed onto the second tapped blind hole (211) and be connected, the screw rod (23) that described the top rushes on block (21) is spirally connected
In the first tapped blind hole (101), first tapped blind hole (101) is opened in cope plate (1) lower surface.
3. a kind of stamping die of damping anticracking according to claim 1, it is characterised in that: the inclined-plane (361) and water
Plane is in 45 degree.
4. a kind of stamping die of damping anticracking according to claim 1, it is characterised in that: under the hole punched device (2)
The height on surface is higher than the height of pressure ring (36) lower surface.
5. a kind of stamping die of damping anticracking according to claim 1, it is characterised in that: second through-hole (401)
Block (21) outer diameter is rushed greater than maximum gauge with third through-hole (501) aperture.
6. a kind of stamping die of damping anticracking according to claim 1, it is characterised in that: lower template (5) lower end
It is equipped with fixing screws (6), the fixing screws (6) pass through lower template (5) and are bolted in stripper plate (4) lower surface.
7. a kind of stamping die of damping anticracking according to claim 1, it is characterised in that: described block (21) quantity of rushing is
Five.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811045874.3A CN109047466A (en) | 2018-09-07 | 2018-09-07 | A kind of stamping die of damping anticracking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811045874.3A CN109047466A (en) | 2018-09-07 | 2018-09-07 | A kind of stamping die of damping anticracking |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109047466A true CN109047466A (en) | 2018-12-21 |
Family
ID=64760783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811045874.3A Withdrawn CN109047466A (en) | 2018-09-07 | 2018-09-07 | A kind of stamping die of damping anticracking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109047466A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117020006A (en) * | 2023-10-09 | 2023-11-10 | 扬州鼎驰金属科技有限公司 | Punching die for copper-aluminum composite board |
-
2018
- 2018-09-07 CN CN201811045874.3A patent/CN109047466A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117020006A (en) * | 2023-10-09 | 2023-11-10 | 扬州鼎驰金属科技有限公司 | Punching die for copper-aluminum composite board |
| CN117020006B (en) * | 2023-10-09 | 2024-02-02 | 扬州鼎驰金属科技有限公司 | Punching die for copper-aluminum composite board |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181221 |
|
| WW01 | Invention patent application withdrawn after publication |