CN220591761U - Super sharp alloy saw bit - Google Patents
Super sharp alloy saw bit Download PDFInfo
- Publication number
- CN220591761U CN220591761U CN202322042614.3U CN202322042614U CN220591761U CN 220591761 U CN220591761 U CN 220591761U CN 202322042614 U CN202322042614 U CN 202322042614U CN 220591761 U CN220591761 U CN 220591761U
- Authority
- CN
- China
- Prior art keywords
- saw blade
- cutter head
- notch
- angle
- base body
- 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.)
- Active
Links
- 239000000956 alloy Substances 0.000 title claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 20
- 238000005520 cutting process Methods 0.000 claims abstract description 22
- 239000011159 matrix material Substances 0.000 claims abstract description 11
- 238000003466 welding Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005488 sandblasting Methods 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The utility model relates to an ultra-sharp alloy saw blade, which comprises a base body arranged on an electric tool and a tool bit welded with the base body; the outer circle of the matrix is provided with a plurality of flutes which are uniformly distributed along the outer circle of the matrix, and each flute is internally welded with one cutter head; the cutter head is provided with a notch which does not influence the welding strength with the matrix; each angle of the cutter head is set as follows: large rake angle α=24°, edge rake angle α1=15°; side angle γ=0.5°, side relief angle γ 1 =1.5°; relief angle beta = 10.5 °, relief angle beta 1 =28°; the notch comprises an arc-shaped groove 21 and a rectangular notch 22; the matrix is also provided with hollowed-out arrows; the beneficial effects of the utility model are as follows: through knifeThe design of each cutting angle of the head improves sharpness, and reduces saw blade cost through the design of the notch of the cutter head.
Description
Technical Field
The utility model relates to the technical field of hard alloy saw blades, in particular to an ultra-sharp alloy saw blade.
Background
The hard alloy circular saw blade is generally applied to cutting various natural woods, artificial boards, nonferrous metal materials and alloys thereof, ferrous metals, composite color steel plates and plastic rubber polymer materials.
The most traditional cutting objects of cemented carbide circular saw blades are wood, including natural wood and artificial boards. Therefore, the geometric parameters of the hard alloy circular saw blade for wood are basically solidified, and the cutting efficiency and the processing cost are relatively stable. Along with the continuous development of the cutting technology and the improvement of the processing technology, the requirements on cutting efficiency and processing cost are higher and higher, so that the manufacturing cost of the saw blade is reduced, and the sharpness of the saw blade is improved;
currently, the front angle of the cutter head of a hard alloy circular saw blade for wood is generally less than or equal to 15 degrees, and the front angle of the cutter blade is less than or equal to 5 degrees; the side angle is less than or equal to 1.5 degrees, and the side relief angle is less than or equal to 3 degrees; the relief angle is typically less than or equal to 15 deg., and the relief angle is typically 10 deg. -15 deg..
The front cutter face and the two side faces of the cutter head are all integral planes and are equal to the length of the cutter head; the knife head angle setting is to consider sharpness and service life, and is more important to service life, so sharpness is seriously sacrificed; the complete plane of the rake face is designed to simplify the design and machining process of the tool bit, and the waste is left as a source.
The alloy saw blade is generally in a single rotation direction, and the reverse rotation cannot be used. However, most of the current rotation direction marks are printed, sprayed or marked (including needle marking, laser marking and the like);
for the rotary direction marks adopting printing and spraying, the marks are damaged quickly because the matrix and the cutting object are necessarily rubbed when the saw blade works. If the saw blade is not scrapped due to one clamping, the rotation direction can not be identified when the saw blade is clamped for the second time. Accidents thus caused occur at times. For the marked saw blade, although better than the saw blade for printing and spraying, the marked saw blade is gradually worn away due to the shallower depth of the marking; when the clamping is carried out again, a novice is easy to reverse, and when the cutting is carried out, the cutter head falls off to hurt people, and the problem needs to be solved.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide the ultra-sharp alloy saw blade, which improves the sharpness of the tool bit and reduces the cost of the tool bit and the cost of the saw blade through the special design of the tool bit; it is desirable to be able to provide a hard alloy circular saw blade construction that is ultra sharp while combining low cost requirements.
In order to solve the problems, the utility model adopts the following technical scheme:
an ultra-sharp alloy saw blade comprises a base body arranged on an electric tool and a tool bit welded with the base body; the outer circle of the matrix is provided with a plurality of flutes which are uniformly distributed along the outer circle of the matrix, and each flute is internally welded with one cutter head; the cutter head is provided with a notch which does not influence the welding strength with the matrix;
further, each angle of the cutter head is set as follows: large rake angle α=24°, edge rake angle α1=15°; side angle γ=0.5°, side relief angle γ 1 =1.5°; relief angle beta = 10.5 °, relief angle beta 1 =28°。
Further, the notch comprises a groove arranged on one surface of the tool bit 2, which is far away from the welding surface of the base body 1.
Further, the width of the cutter head is B, the groove 21 is in a circular arc shape, and the radius=b of the circular arc; the depth of the arc cutting tool bit is 15-20% B; the length of the cutter head is L; the distance from the top end of the arc to the top end is L 2 The method comprises the steps of carrying out a first treatment on the surface of the The L is 2 The L2/L is more than or equal to 20% and less than or equal to 30%.
Further, the notch further comprises rectangular notches arranged at the lower parts of the two side faces of the cutter head.
Further, the thickness of the substrate is t; the thickness of the cutter head is T; the length of the rectangular notch is L 1 The L is 1 =20-30%l; the depth of the rectangular notch is T 1 The method comprises the steps of carrying out a first treatment on the surface of the The T is 1 T-2×t1=t is satisfied.
Further, the diameter of the saw blade is D; 2-6 hollowed-out arrows are uniformly distributed on the matrix between 40% D and 60% D circles; the direction of the hollowed-out arrow is consistent with the rotation direction of the saw blade; the sum of the circumferential lengths of the hollowed-out arrows accounts for 40% -50% of the circumference of the radial distribution.
Furthermore, the radius of all circular arcs on the hollowed-out arrow is more than or equal to 1.5t.
The beneficial effects of the utility model are as follows:
through the design of each cutting angle of carbide tool bit, can obviously improve saw bit sharpness, reduce the energy consumption, the cutting feel is light and fast. Without a significant reduction in blade life.
Through the arranged gap for reducing weight; the front cutter face of the cutter head is hollowed out to form a circular gap, and the two side faces of the cutter head are respectively cut off into a part with the length direction L1 and the thickness T1, so that the volume and the weight of the cutter head can be reduced by 10-20%; in general, the raw material cost of the cutter head accounts for about 40% of the whole cost of the saw blade, so that the processing cost of the saw blade can be reduced by about 6% as a whole, and the reduction of the cost by 6% is of great significance to labor-intensive enterprises;
moreover, the three removed positions are not beneficial to cutting, do not play a role in cutting, but increase friction with a cutting object, generate heat, increase energy consumption, increase temperature rise of the saw blade and increase the risk of instability and deformation of the saw blade.
Through the hollowed-out arrow arranged, the saw blade is ensured to keep clear and accurate rotation direction identification in the whole life cycle. The circumferential uniform distribution of the arrows ensures the dynamic balance of the saw blade and prevents the saw blade from swinging and vibrating in the working process. The radial position of the arrow is the position with the maximum tangential compressive stress, the arrow also obviously plays a role of a wind hole, plays a good role in releasing the tangential compressive stress, and effectively prevents the unstable deformation of the saw blade. All the arc radiuses of the arrows are larger than or equal to 1.5t, so that the processing of the arrows is more suitable for various processing methods, and meanwhile, the phenomenon of stress concentration is effectively avoided.
Drawings
FIG. 1 is a schematic front view of the structure of the present utility model;
FIG. 2 is a cross-sectional view at K-K of FIG. 1;
FIG. 3 is an enlarged view of FIG. 1 at I;
FIG. 4 is a cross-sectional view taken at C-C of FIG. 3;
FIG. 5 is a schematic view of the F-direction of FIG. 3;
FIG. 6 is a schematic front view of the structure of the tool bit;
FIG. 7 is a schematic left side view of the tool tip;
FIG. 8 is a schematic top view of a tool tip;
fig. 9 is a schematic perspective view of a cutter head.
In the figures of the drawings reference numerals are used,
1-substrate, 2-tool bit, 11-chip flute, 12-hollowed-out arrow, 21-groove and 22-rectangular notch.
Detailed Description
The drawings in the embodiments of the present utility model will be combined; the technical scheme in the embodiment of the utility model is clearly and completely described; the described embodiments are only a few embodiments of the present utility model; but not all embodiments, are based on embodiments in the present utility model; all other embodiments obtained by those of ordinary skill in the art without undue burden; all falling within the scope of the present utility model.
Example 1
As shown in figures 1-9 of the drawings,
an ultra-sharp alloy saw blade comprises a base body 1 arranged on an electric tool and a tool bit 2 welded with the base body 1; the outer circle of the base body 1 is provided with a plurality of chip grooves 11, the chip grooves 11 are uniformly distributed along the outer circle of the base body 1, and each chip groove 11 is internally welded with one cutter head 2; the cutter head 2 is provided with a notch which does not affect the welding strength with the matrix 1. As shown in fig. 8, the notch can reduce the weight of the tool bit 2 without affecting the strength of the tool bit 2, and can reduce the cost of the tool bit 2, thereby reducing the manufacturing cost of the whole saw blade.
The number of the notches is two, and one notch is a groove 21 arranged on the front cutter surface;
the width of the cutter head 2 is B, the groove 21 is in a circular arc shape, and the radius=b of the circular arc; arc cutting into front of the cutter head 2The depth of the knife face is 15-20% B; the length of the cutter head 2 is L; the distance from the top end of the arc to the top end is L 2 The method comprises the steps of carrying out a first treatment on the surface of the The L is 2 Meets the requirements of 20 percent to less than or equal to L 2 /L≤30%。
The other is a rectangular notch 22 which is arranged on both sides of the cutter head 2 and is close to the welding surface with the base body 1.
The thickness of the substrate 1 is t; the thickness of the cutter head 2 is T; the rectangular notch 22 has a length L 1 The L is 1 =20-30%l; the rectangular notch 22 has a depth T 1 The method comprises the steps of carrying out a first treatment on the surface of the The T is 1 Satisfy T-2 xT 1 =t. That is, the thickness of the tool bit 2 at the rectangular notch 22 is the same as that of the base body 1, and the contact area between the tool bit 2 and the base body 1 during welding is unchanged, so that the welding strength is not affected.
The volume and the weight of the cutter head 2 can be reduced by 10-20% by digging a round notch on the front cutter face of the cutter head 2 and cutting away the parts with the thickness of T1 along the length direction L1 on the two side faces of the cutter head 2; in general, the raw material cost of the cutter head 2 accounts for about 40% of the total cost of the saw blade, so that the processing cost of the saw blade can be reduced by about 6% as a whole; the cost of the labor-intensive enterprises is reduced by 6%, and the method is of great significance to the profitability of the enterprises;
moreover, the three removed parts are not beneficial to cutting, do not play a role in cutting, but increase friction and heating between the three parts and an object to be cut, increase energy consumption, increase temperature rise of the saw blade and increase the risk of instability and deformation of the saw blade; meanwhile, the notch does not need to be ground, so that abrasion of a grinding wheel and consumption of electric energy during grinding are reduced. Therefore, the arranged notch can reduce the cost, improve the performance of the saw blade and has good popularization prospect.
As shown in fig. 3-5, the various angles of the cutter head 2 are set to: large rake angle α=24°, edge rake angle α1=15°; side angle γ=0.5°, side relief angle γ 1 =1.5°; relief angle beta = 10.5 °, relief angle beta 1 =28°. The determination of each angle of the cutter head is obtained through repeated experiments, the service life and sharpness of the cutter head are considered, the sharpness of the cutter head 2 is mainly considered, and the service life is slightly reduced compared with the original service life;
the redesign of each angle of the cutter head can obviously improve the sharpness of the saw blade, reduce the energy consumption and make the cutting feel light and fast. Without significant reduction in blade life;
in the working and manufacturing processes of the utility model,
the notch on the tool bit 2 is pressed and formed by a die when the tool bit 2 is manufactured, and then is welded on the substrate 1 at high frequency; the saw blade with the welded tool bit 2 is cut with a grinding wheel according to the designed angle to form a large front angle alpha, a front angle alpha 1, a side angle gamma and a side back angle gamma on a cutting machine 1 Relief angle beta and relief angle beta 1 ；
The manufactured saw blade is subjected to sand blasting on the position of the tool bit 2, and cutting fluid left during sharpening is eliminated; and then the whole saw blade is subjected to paint spraying or oil immersion treatment, so that rust is avoided.
The welded saw blade carries out sand blasting on the part of the tool bit 2, and the flux left during welding is eliminated; and then the whole saw blade is subjected to paint spraying or oil immersion treatment, so that rust is avoided.
When cutting is needed, the saw blade is mounted on the electric tool, the mounting direction is noted, and the rotation direction of the electric tool is consistent with the rotation direction mark on the saw blade.
Example 2
This embodiment is substantially identical in structure to embodiment 1,
the difference is that,
as shown in fig. 1 and 2, the diameter of the saw blade is D; 2-6 hollowed-out arrows 12 are uniformly distributed on the base body 1 in the circumferential direction between 40% D and 60% D of the diameter; the direction of the hollowed-out arrow 12 is consistent with the rotation direction of the saw blade; the sum of the circumferential lengths of the hollowed-out arrows 12 accounts for 40% -50% of the circumference of the radial distribution.
The number of hollowed-out arrows 12 is properly adjusted according to the diameter of the saw blade, and the number of the arrows is 2 for saw blades with the diameter of less than 150mm generally; the number of saw blade arrows with the diameter of 180-230mm is 3; saw blades with diameters of more than 250-300mm, and the number of arrows is 4; saw blades with diameters of more than or equal to 400mm and the number of arrows is 6;
the hollowed-out arrow 12 ensures that the saw blade maintains clear and accurate rotation direction identification during the whole life cycle.
The circumferential uniform distribution of the hollowed-out arrows 12 ensures the dynamic balance of the saw blade and prevents the saw blade from swinging and vibrating in the working process.
The radial position of the hollowed-out arrow 12 is the position with the maximum tangential compressive stress, and the arrow also obviously plays a role of a wind hole, plays a good role in releasing the tangential compressive stress, and effectively prevents the unstable deformation of the saw blade.
Example 3
This embodiment is substantially identical in structure to embodiment 2,
the difference is that,
as shown in FIG. 1, the radius of all circular arcs forming the hollowed-out arrow 12 is greater than or equal to 1.5t, so that the processing of the arrow is more suitable for various processing methods, and the phenomenon of stress concentration is effectively avoided.
The above; is only a preferred embodiment of the present utility model; the scope of the utility model is not limited in this respect; any person skilled in the art is within the technical scope of the present disclosure; equivalent substitutions or changes are made according to the technical proposal of the utility model and the improved conception thereof; are intended to be encompassed within the scope of the present utility model.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is merely an embodiment of the present utility model, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present utility model, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (6)
1. An ultra-sharp alloy saw blade, characterized by comprising a base body (1) mounted on a power tool and a tool bit (2) welded with the base body (1); a plurality of flutes (11) are arranged on the outer circle of the base body (1), the flutes (11) are uniformly distributed along the outer circle of the base body (1), and each flute (11) is internally welded with one cutter head (2); the cutter head (2) is provided with a notch which does not affect the welding strength with the matrix (1);
the notch comprises a groove (21) arranged on one surface of the cutter head (2) far away from the welding surface of the base body (1);
the notch also comprises rectangular notches (22) arranged at the lower parts of two side surfaces of the cutter head (2).
2. An ultra-sharp alloy saw blade according to claim 1, wherein: the angles of the cutter head (2) are set as follows: large rake angle α=24°, rake angle α 1 =15°; side angle γ=0.5°, side relief angle γ 1 =1.5°; relief angle beta = 10.5 °, relief angle beta 1 =28°。
3. A super-front according to claim 2The alloy saw blade is characterized in that the width of the tool bit (2) is B, the groove (21) is in the shape of a circular arc, and the radius of the circular arc=B; the depth of the arc cutting tool bit (2) is 15-20% B; the length of the cutter head (2) is L; the distance from the top end of the arc to the top end is L 2 The method comprises the steps of carrying out a first treatment on the surface of the The L is 2 The L2/L is more than or equal to 20% and less than or equal to 30%.
4. An ultra-sharp alloy saw blade according to claim 3, wherein: the thickness of the substrate (1) is t; the thickness of the cutter head (2) is T; the length of the rectangular notch (22) is L 1 The L is 1 =20-30%l; the depth of the rectangular notch (22) is T 1 The method comprises the steps of carrying out a first treatment on the surface of the The T is 1 Satisfying (T-2×t1) =t.
5. An ultra-sharp alloy saw blade according to claim 4, wherein: the diameter of the saw blade is D; 2-6 hollowed-out arrows (12) are uniformly distributed on the substrate (1) between 40% D and 60% D of circles in diameter; the direction of the hollowed-out arrow (12) is consistent with the rotation direction of the saw blade; the sum of the circumferential lengths of the hollowed-out arrows (12) accounts for 40% -50% of the circumference of the radial distribution.
6. An ultra-sharp alloy saw blade according to claim 5, wherein: all the arc radiuses on the hollowed-out arrows (12) are larger than or equal to 1.5t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322042614.3U CN220591761U (en) | 2023-08-01 | 2023-08-01 | Super sharp alloy saw bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322042614.3U CN220591761U (en) | 2023-08-01 | 2023-08-01 | Super sharp alloy saw bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220591761U true CN220591761U (en) | 2024-03-15 |
Family
ID=90182095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322042614.3U Active CN220591761U (en) | 2023-08-01 | 2023-08-01 | Super sharp alloy saw bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220591761U (en) |
-
2023
- 2023-08-01 CN CN202322042614.3U patent/CN220591761U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105665805B (en) | One kind is hardened the special indexable hat rose cutter of steel mold | |
| CN100584493C (en) | Hard alloy accurately-processed finger-type milling tool and process technique | |
| CN103192127B (en) | Based on the clip type form cutter dish of B2 type diamond coatings blade | |
| CN202411558U (en) | Rough and finish integral machining diamond reamer | |
| CN205949880U (en) | Cutter that complete martensite alloy steel of cryrogenic that hardens cut firmly | |
| WO2022089158A1 (en) | Micro-blade cutting tool and manufacturing method therefor | |
| CN220591761U (en) | Super sharp alloy saw bit | |
| CN214392488U (en) | Annular cutter for drilling composite material | |
| WO2021197215A1 (en) | Blank body, and cutting tool having front cutter face made of helical superhard material | |
| CN104126360A (en) | Bionic agricultural machinery movable blade and manufacturing method thereof | |
| CN107414159A (en) | A kind of slotting cutter of processing high-hardness material | |
| CN207239182U (en) | A kind of hardened steel with can interrupted cut deep trouth cubic boron nitride cutting tool | |
| CN216828835U (en) | Hard alloy milling cutter with high-hardness coating | |
| CN101134255B (en) | Hard alloy precision working rack type cutter and processing technique | |
| JP2021530372A (en) | Diamond cutting tool for machining hard and brittle difficult-to-cut materials | |
| CN212094380U (en) | Turning tool for drilling/boring | |
| CN112122695B (en) | Preparation process of laser welding saw blade | |
| CN211539474U (en) | Bionic diamond circular saw blade | |
| CN203942789U (en) | Bionical farm machinery knife section | |
| CN208825659U (en) | A kind of rose cutter of suitable high rigidity mold | |
| CN202894486U (en) | Hard alloy saw blade with heat radiating holes | |
| CN203316752U (en) | High-tensile steel high-performance cutting super-hard cutter | |
| CN103071822B (en) | High strength steel high-performance cutting superhard cutter | |
| CN102990146A (en) | Fillet CBN (Cubic Boron Nitride) milling cutter | |
| CN114101794A (en) | Laser welding saw blade |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |