CN107775006A - A kind of gradient hard alloy DRILL POINT DIES - Google Patents
A kind of gradient hard alloy DRILL POINT DIES Download PDFInfo
- Publication number
- CN107775006A CN107775006A CN201711313242.6A CN201711313242A CN107775006A CN 107775006 A CN107775006 A CN 107775006A CN 201711313242 A CN201711313242 A CN 201711313242A CN 107775006 A CN107775006 A CN 107775006A
- Authority
- CN
- China
- Prior art keywords
- hard alloy
- base
- drill point
- groove
- alloy drill
- 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.)
- Pending
Links
- 239000000956 alloy Substances 0.000 title claims abstract description 47
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 47
- 239000000843 powder Substances 0.000 claims description 32
- 229910003470 tongbaite Inorganic materials 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 238000000227 grinding Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 210000001161 mammalian embryo Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/007—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/12—Metallic powder containing non-metallic particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/004—Filling molds with powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of gradient hard alloy DRILL POINT DIES, base made of extra-coarse grained carbide alloy is used including one, a groove is provided with the base, the cross section bottom of the groove is curved, filled with mold base made of extra-coarse grained carbide alloy is used in the groove, the hardness of the mold base is higher than the hardness of base.The application gradient hard alloy DRILL POINT DIES, shock resistance is good, and properties of product uniformity is high.
Description
Technical field
The present invention relates to hard alloy technical field, and in particular to a kind of gradient hard alloy DRILL POINT DIES.
Background technology
Hard alloy is high rigidity, high intensity, the material of high abrasion, is obtained for extensively in the various fields of modern industry
Using.Hart metal product is typically using the carbide micron powder of high rigidity refractory metal as main component, in vacuum drying oven
Or the sintered metal product sintered in hydrogen sintering furnace.Hart metal product be widely used in petroleum drilling tooth, coalcutter tooth,
The fields such as Cold Miller tooth, diel, roll.
Chinese patent CN103817150, which discloses a kind of gradient-structure type carbide roll ring, includes collars outer layer and collars
Core, the configuration of collars outer layer is in the outer surface of collars core, in collars outer layer with there is mutual crucible zone between collars core, outside collars
The composition of forming component gradient between layer and collars core, collars outer layer and collars core is different, will mix the dried collars of wax
Outer layer ball mill mixing and the dried collars core ball mill mixing place Min layers closed assembly powder of wax is mixed, cold moudling be collars blank, is passed through
Sintering obtains final products.It can be sent out in sintering process the disadvantage is that, obtain compound hart metal product using component gradient
Because composition caused by concentration gradient spreads, trickle technique difference can cause spread condition widely different, cause final for life
Properties of product uniformity is difficult to control.
Chinese patent CN2016111583277, it is a solution to above mentioned problem, but through making after a while
With rear, it is found that the DRILL POINT DIES is in use, because levels material is different and is compacted at one piece, cause when in use stress concentration exist
Faying face, the faying face are acted on by pure shear stress, and faying face both sides easily rupture, and cause die life to reduce,
For the situation, applicant has invented a kind of new gradient hard alloy DRILL POINT DIES preparation structure after numerous studies.
The content of the invention
The present invention has made improvements in view of the above-mentioned problems of the prior art, i.e., the technical problems to be solved by the invention are
A kind of gradient hard alloy DRILL POINT DIES, uniform force, service life length are provided.
In order to solve the above-mentioned technical problem, the technical scheme is that：A kind of gradient hard alloy DRILL POINT DIES, including one
The base made of hard alloy, a groove is provided with the base, the cross section bottom of the groove is curved, described recessed
Filled with mold base made of hard alloy is used in groove, the hardness of the mold base is higher than the hardness of base.
Further, the cross section semicircular in shape of the groove.
Further, the U-shaped profile of the groove, bottom are semicircle, and top two side is parallel vertically.
Further, the extra-coarse grained carbide alloy of the base and mold base is by WC powder, Co powder and Cr3C2Powder is formed, its
Middle WC powders footpath dBottomFor 6-16 μm.
Further, the hard alloy of the base and mold base is formed by WC powder, Co powder and VC powder, wherein WC powders footpath
dBottomFor 6-16 μm.
Further, the radius of the groove is 5~10mm.
Further, the Sidewall Height of the groove Upper vertical is 5~10mm.
Further, a T-shaped blowpit is additionally provided with the base.
Further, the blowpit include vertical slot and connect vertical slot in the middle part of translot, the vertical slot both ends respectively with bottom
Two opposite side walls are connected before and after seat, and translot one end is connected with base right side wall.
Further, the groove one end is connected with chassis left side wall, and 1 is left between the other end and blowpit vertical slot
~5mm gap.
Compared with prior art, the invention has the advantages that：The present invention on the relatively low base of hardness by setting
Put a semicircular deep gouge, fill the higher hard alloy of hardness in the deep gouge, circular arc contact surface ensure that mold base with
Stress is radially uniformly distributed between base, and lifting surface area increase, stress is no longer concentrated, and service life rises appreciably.
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
Brief description of the drawings
Fig. 1 is the gradient hard alloy DRILL POINT DIES schematic diagram of the embodiment of the present invention one.
Fig. 2 is that the gradient hard alloy DRILL POINT DIES of the embodiment of the present invention one illustrates left view.
Fig. 3 is the gradient hard alloy DRILL POINT DIES sectional view of the embodiment of the present invention one.
Fig. 4 is the gradient hard alloy DRILL POINT DIES schematic diagram of the embodiment of the present invention two.
In figure：1- bases, 2- mold bases, 3- blowpits, 31- vertical slots, 32- translots.
Embodiment
Embodiment one：As shown in Figure 1 to Figure 3, a kind of gradient hard alloy DRILL POINT DIES, including made of a use hard alloy
Base 1, it is semicircular groove that a cross section is provided with the base, is filled with the groove made of hard alloy
Mold base 2, the hardness of the mold base are higher than the hardness of base.
In the present embodiment, the extra-coarse grained carbide alloy of the base and mold base is by WC powder, Co powder and Cr3C2Powder (or will
It makes VC powder into) form, wherein WC powders footpath dBottomFor 6-16 μm.
In the present embodiment, the radius of the groove is 5~10mm.
In the present embodiment, a T-shaped blowpit 3 is additionally provided with the base.
In the present embodiment, the blowpit includes vertical slot 31 and connects the translot 32 in the middle part of vertical slot, the vertical slot both ends point
It is not connected with two opposite side walls before and after base, translot one end is connected with base right side wall.
In the present embodiment, the groove one end is connected with chassis left side wall, is stayed between the other end and blowpit vertical slot
There is 1~5mm gap.
The gradient hard alloy DRILL POINT DIES, is made according to the following steps：
(1) compound of base is prepared：WC powder, Co powder and Cr are weighed respectively3C2Powder (or with VC powder) carries out feed proportioning,
WC powders footpath dBottomFor 6-16 μm, will it is well mixed after raw material carry out wet ball grinding, wet ball grinding terminate after by after wet ball grinding
Compound carry out first time wet type sieving, by first time sieve after compound be dried in vacuo, after vacuum drying
Compound carries out second and sieved, and then enters wax drying, obtains the carbide alloy mixture of base；
(2) mold base compound is prepared：WC powder, Co powder and Cr are weighed respectively3C2Powder (or with VC powder) carries out feed proportioning, WC
Powder footpath dTopFor 0.6-6 μm, will it is well mixed after raw material carry out wet ball grinding, wet ball grinding terminate after by after wet ball grinding
Compound carries out first time wet type sieving, and the compound after first time is sieved is dried in vacuo, will be mixed after vacuum drying
Close material and carry out second of sieving, then enter wax drying, obtain the carbide alloy mixture of mold base；
(3) die-filling compacting：The carbide alloy mixture of appropriate base is first loaded into mould, applies 140MPa pressure
Compacting, and in the semi-circular recesses of base upper press one and T-shaped blowpit (its relevant parameter is chosen by setting value), then will be appropriate
The carbide alloy mixture of mold base loads mould and is placed in groove, applies pressure 100-140MPa by the compound in mould
Compacting, obtain gradient hard alloy DRILL POINT DIES pressed compact；
(4) sinter：By gradient hard alloy drilling tail die body, heated up with 1~3 DEG C/min speed, be warming up to 300 first
DEG C and be incubated 250~300min, then proceed to be warming up to 1400-1450 DEG C and heat preservation sintering 30-50min, then with 1 DEG C/min
Cooling, the gradient hard alloy DRILL POINT DIES after being sintered.
By setting a semicircular deep gouge on the base compared with soft, the mould of higher hardness is filled in the deep gouge
Embryo, the circular arc contact surface of mold base ensure that stress is radially uniformly distributed, and lifting surface area increase, stress is no longer concentrated, and is used
Life-span rises appreciably.
Embodiment two：As shown in figure 4, most is identical for its structure and embodiment, difference is its groove structure, top
Cross section to be square, the cross section of bottom is semicircle.As long as bottom portion of groove semicircular in shape, with regard to stress can be allowed radially uniform
Distribution.
The foregoing is only presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, it should all belong to the covering scope of the present invention.
Claims (10)
- A kind of 1. gradient hard alloy DRILL POINT DIES, it is characterised in that：Including one with base made of hard alloy, on the base A groove is provided with, the cross section bottom of the groove is curved, is filled with the groove and uses mold base made of hard alloy, The hardness of the mold base is higher than the hardness of base.
- 2. gradient hard alloy DRILL POINT DIES according to claim 1, it is characterised in that：The cross section of the groove is in semicircle Shape.
- 3. gradient hard alloy DRILL POINT DIES according to claim 1, it is characterised in that：The U-shaped profile of the groove, Bottom is semicircle, and top two side is parallel vertically.
- 4. according to the gradient hard alloy DRILL POINT DIES described in claim 1,2 or 3, it is characterised in that：The base and mold base Hard alloy is by WC powder, Co powder and Cr3C2Powder is formed, wherein WC powders footpath dBottomFor 6-16 μm.
- 5. according to the gradient hard alloy DRILL POINT DIES described in claim 1,2 or 3, it is characterised in that：The base and mold base Hard alloy is formed by WC powder, Co powder and VC powder, wherein WC powders footpath dBottomFor 6-16 μm.
- 6. the gradient hard alloy DRILL POINT DIES according to Claims 2 or 3, it is characterised in that：The bottom portion of groove radius is 5 ~10mm.
- 7. gradient hard alloy DRILL POINT DIES according to claim 3, it is characterised in that：The side wall of the groove Upper vertical Highly it is 5~10mm.
- 8. according to the gradient hard alloy DRILL POINT DIES described in claim 1,2 or 3, it is characterised in that：Also set up on the base There is a T-shaped blowpit.
- 9. gradient hard alloy DRILL POINT DIES according to claim 8, it is characterised in that：The blowpit includes vertical slot and company The translot in the middle part of vertical slot is connect, the vertical slot both ends are connected with two opposite side walls before and after base respectively, and translot one end is right with base Side wall is connected.
- 10. gradient hard alloy DRILL POINT DIES according to claim 9, it is characterised in that：The groove one end and base Left side wall is connected, and 1~5mm gap is left between the other end and blowpit vertical slot.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313242.6A CN107775006A (en) | 2017-12-12 | 2017-12-12 | A kind of gradient hard alloy DRILL POINT DIES |
| CN201810741658.6A CN108941575B (en) | 2017-12-12 | 2018-07-09 | A kind of gradient hard alloy DRILL POINT DIES |
| PCT/CN2018/099316 WO2019114296A1 (en) | 2017-12-12 | 2018-08-08 | Gradient cemented carbide self-drilling screw die |
| TW107136010A TWI687272B (en) | 2017-12-12 | 2018-10-12 | Gradient hard alloy drilling mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313242.6A CN107775006A (en) | 2017-12-12 | 2017-12-12 | A kind of gradient hard alloy DRILL POINT DIES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107775006A true CN107775006A (en) | 2018-03-09 |
Family
ID=61430478
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711313242.6A Pending CN107775006A (en) | 2017-12-12 | 2017-12-12 | A kind of gradient hard alloy DRILL POINT DIES |
| CN201810741658.6A Active CN108941575B (en) | 2017-12-12 | 2018-07-09 | A kind of gradient hard alloy DRILL POINT DIES |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810741658.6A Active CN108941575B (en) | 2017-12-12 | 2018-07-09 | A kind of gradient hard alloy DRILL POINT DIES |
Country Status (3)
| Country | Link |
|---|---|
| CN (2) | CN107775006A (en) |
| TW (1) | TWI687272B (en) |
| WO (1) | WO2019114296A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019114296A1 (en) * | 2017-12-12 | 2019-06-20 | 鑫京瑞钨钢（厦门）有限公司 | Gradient cemented carbide self-drilling screw die |
| EP3650136A4 (en) * | 2018-04-03 | 2020-07-08 | Xinjingrui Tungsten Steel (Xiamen) Co., Ltd. | Cemented carbide screw nut mold having multi-layer graded structure and manufacturing method therefor |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05222403A (en) * | 1992-02-13 | 1993-08-31 | Mitsubishi Materials Corp | Production of high-strength tungsten carbide base cemented carbide |
| JP2001234262A (en) * | 2000-02-17 | 2001-08-28 | Hitachi Car Eng Co Ltd | Heat radiator |
| US6911063B2 (en) * | 2003-01-13 | 2005-06-28 | Genius Metal, Inc. | Compositions and fabrication methods for hardmetals |
| CN201132191Y (en) * | 2007-11-01 | 2008-10-15 | 张振乾 | Die for dill tail moulding screw |
| US8025112B2 (en) * | 2008-08-22 | 2011-09-27 | Tdy Industries, Inc. | Earth-boring bits and other parts including cemented carbide |
| CN101602228B (en) * | 2009-06-19 | 2011-06-01 | 广东新劲刚超硬材料有限公司 | Hard coating composite side plate for ceramic mold and manufacturing method thereof |
| DE102010014303A1 (en) * | 2010-04-09 | 2011-10-13 | Kennametal Inc. | Composite component for rolling steel, comprises a carrier made of powder metal, and a wear-resistant body made of hard metal that is embedded in sections in the carrier, where the hard-metal body is metallized in sections |
| CN204082016U (en) * | 2014-09-29 | 2015-01-07 | 株洲硬质合金集团有限公司 | A kind of diamond compact substrate |
| CN105671398B (en) * | 2016-01-29 | 2017-07-11 | 柳州市安龙机械设备有限公司 | The processing method of hard alloy rock drilling tooth |
| CN106735167B (en) * | 2016-12-15 | 2018-05-25 | 鑫京瑞钨钢（厦门）有限公司 | A kind of preparation method of extra-coarse grained carbide alloy gradient DRILL POINT DIES |
| CN107775006A (en) * | 2017-12-12 | 2018-03-09 | 鑫京瑞钨钢（厦门）有限公司 | A kind of gradient hard alloy DRILL POINT DIES |
-
2017
- 2017-12-12 CN CN201711313242.6A patent/CN107775006A/en active Pending
-
2018
- 2018-07-09 CN CN201810741658.6A patent/CN108941575B/en active Active
- 2018-08-08 WO PCT/CN2018/099316 patent/WO2019114296A1/en active Application Filing
- 2018-10-12 TW TW107136010A patent/TWI687272B/en active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019114296A1 (en) * | 2017-12-12 | 2019-06-20 | 鑫京瑞钨钢（厦门）有限公司 | Gradient cemented carbide self-drilling screw die |
| EP3650136A4 (en) * | 2018-04-03 | 2020-07-08 | Xinjingrui Tungsten Steel (Xiamen) Co., Ltd. | Cemented carbide screw nut mold having multi-layer graded structure and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108941575A (en) | 2018-12-07 |
| TW201927446A (en) | 2019-07-16 |
| TWI687272B (en) | 2020-03-11 |
| WO2019114296A1 (en) | 2019-06-20 |
| CN108941575B (en) | 2019-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5043123A (en) | Method and apparatus for manufacturing finished parts as composite bodies from pulverulent rolling materials | |
| CN106735167B (en) | A kind of preparation method of extra-coarse grained carbide alloy gradient DRILL POINT DIES | |
| CN106738210A (en) | A kind of mould and the method using Making mold GOS scintillating ceramics | |
| CN107775006A (en) | A kind of gradient hard alloy DRILL POINT DIES | |
| CN110899693A (en) | Forming method and forming device for powder metallurgy part | |
| CN109663911A (en) | A kind of hard alloy 3-edge surgical knife tool thermal sintering integrated mould and preparation method | |
| NL8100518A (en) | METHOD FOR MANUFACTURING A METALLIC SINTER BODY AND FOR CARRYING OUT THE APPARATUS APPARATUS | |
| CN105215363A (en) | A kind of preparation method with the copper-base powder metallurgy part of densified surface | |
| CN106756599A (en) | The preparation method of cBN High Speed Steel Composites and cBN High Speed Steel Composites | |
| CN110394451A (en) | It is a kind of using NbC as the guide roller production technology of main phase | |
| US6571858B2 (en) | Method of manufacturing preform for compounding use | |
| CN106242580A (en) | A kind of boron nitride based composite ceramic mold materials and preparation method thereof | |
| CN108754272A (en) | A kind of preparation method of big L/D ratio fine grain tungsten copper bar | |
| US3717694A (en) | Hot pressing a refractory article of complex shape in a mold of simple shape | |
| CN101920720B (en) | Plunger body and manufacturing method thereof | |
| CN104602853B (en) | The preparation method of impregnating by pressure type metal-base composites | |
| CN110052605B (en) | Preparation method of hard alloy functionally graded material | |
| CN104496498B (en) | A kind of preparation method of bottom casting train wheel graphite jig | |
| Issitt et al. | Rheology of mixed powder plastisols | |
| CN106242574A (en) | A kind of tungsten carbide-base composite ceramic die material and preparation method thereof | |
| CN108220738A (en) | Method for manufacturing screw material barrel of granulator | |
| CN104625076A (en) | Production process of composite rolls | |
| CN112676567B (en) | Powder metallurgy movable ring and preparation method thereof | |
| CN109202086B (en) | Preparation method of iron nut | |
| WO2005081640A2 (en) | Method of molding metal powder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180309 |
|
| WD01 | Invention patent application deemed withdrawn after publication |