CN107775020B - Double-sided groove type indexable cutting blade for semi-finishing or rough machining - Google Patents
Double-sided groove type indexable cutting blade for semi-finishing or rough machining Download PDFInfo
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- CN107775020B CN107775020B CN201711182484.6A CN201711182484A CN107775020B CN 107775020 B CN107775020 B CN 107775020B CN 201711182484 A CN201711182484 A CN 201711182484A CN 107775020 B CN107775020 B CN 107775020B
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- 238000003754 machining Methods 0.000 title claims abstract description 11
- 230000000903 blocking effect Effects 0.000 claims description 24
- 230000007704 transition Effects 0.000 claims description 8
- 238000012545 processing Methods 0.000 abstract description 5
- 230000009471 action Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/22—Cutting tools with chip-breaking equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2200/00—Details of cutting inserts
- B23B2200/32—Chip breaking or chip evacuation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Knives (AREA)
Abstract
The invention provides a double-sided slot type indexable cutting insert for semi-finishing to rough machining, which has a polygonal geometric structure arranged symmetrically up and down, and comprises: upper and lower surfaces, and a plurality of side surfaces extending therebetween, adjacent side surfaces being transitionally joined by an arcuate surface; the rake face and the edge surface arranged on the rake face intersect with the side surface to form a main cutting edge, and intersect with the arc surface to form an arc cutting edge; the bottom surface of the groove, the concave surface of the groove which is concave on the bottom surface of the groove and extends towards the geometric center of the blade, and the boss and the antifriction groove which are arranged on the concave surface of the groove. The geometric center of the blade is provided with a mounting through hole. The invention reduces the contact area and contact time of the cutter scraps by reasonably arranging the bottom surface of the stepped chip breaker and the antifriction groove, so as to reduce the temperature of the cutter blade during cutting and prolong the service life of the cutter blade. In addition, the invention considers the processing characteristics of different occasions, and the size of the clearance surface is adjusted to ensure that the blade can play a good role in semi-finishing to rough machining.
Description
Technical Field
The invention belongs to the field of metal cutting machining, and particularly relates to a double-sided groove type indexable cutting insert for semi-finishing or rough machining.
Background
The cutting heat and the cutting temperature caused by it are one of the important physical factors affecting the cutting state of metal, which is particularly evident in semi-finishing or roughing with large cutting parameters. Most of the energy is converted to thermal energy during cutting, except that a small portion of the energy is used to form new surfaces and create latent energy in the form of lattice distortion, etc. The cutting temperature is increased due to a large amount of cutting heat, so that on one hand, the hardness of the cutter material is reduced, the abrasion of hard particles of the cutter is accelerated, and on the other hand, the chemical activity of the surface of the cutter is increased, and the diffusion abrasion and the chemical abrasion of the cutter are accelerated.
The metal to be cut generates partial heat by elastic and plastic deformation under the action of the cutter, and simultaneously, a great amount of heat is generated by friction between the chip and the front cutter surface and friction between the workpiece and the rear cutter surface, and then the chip is curled under the action of the cutting guide surface of the blade and the chip breaker arranged, and finally, the chip is broken under the action of a plurality of factors and is discharged out of a processing area. Most of the heat generated in this process is carried away by the chip, but a large amount of heat is transferred to the blade during the action of the chip with the blade, resulting in an increase in the temperature of the blade. Therefore, the cutting temperature depends not only on the position and the quantity of the cutting heat, but also on the speed of the transfer and the dissipation of the cutting heat. The control of the cutting temperature not only aims to reduce the generation of cutting heat, but also designs a reasonable and effective heat dissipation way. The contact area and contact time of the blade and cutting are reduced, heat generated by friction can be reduced, and heat conduction of chips to the blade is reduced. In the prior art, this point is not considered, or only simple treatment is carried out, and the method cannot play a good role in rough machining or semi-finishing of steel parts at the same time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the double-sided groove type indexable cutting insert for semi-finishing or rough machining.
In order to solve the technical problems, the invention adopts the following technical scheme:
The double-sided groove type indexable cutting blade for semi-finishing to rough machining is provided with a polygonal geometric structure which is arranged symmetrically up and down, a mounting through hole is formed in the geometric center of the blade, the cutting blade comprises an upper surface, a lower surface and a plurality of side surfaces extending between the upper surface and the lower surface, the adjacent side surfaces are in transitional connection through an arc surface, the upper surface or the lower surface is provided with at least 1 vertex angle A, a boss is arranged between the vertex angle A and the mounting through hole, the top plane of the boss is the highest plane on the upper surface or the lower surface, and the side surface of the boss is a chip blocking surface;
Each vertex angle A is provided with a cutting unit, the cutting unit comprises a cutting edge and a chip breaker groove, the cutting edge comprises an arc cutting edge and a main cutting edge, the arc cutting edge is formed by intersecting an arc surface with an upper surface or a lower surface, and the main cutting edge is formed by intersecting a side surface with the upper surface or the lower surface;
The chip breaker groove comprises an arc cutting edge, a land, a rake face, a groove bottom face, a chip blocking face and a top plane which are sequentially connected along the direction that the arc cutting edge begins to be towards the installation through hole, wherein the land and the rake face are in smooth transition through an arc, and the rake face and the groove bottom face are in smooth transition through an arc;
The upper surface or the lower surface is also provided with a groove bottom concave surface which is sunken in the groove bottom surface and extends towards the geometric center of the blade, the groove bottom concave surface is in smooth transition with the boss and the groove bottom surface through circular arcs, and the groove bottom concave surface is gradually sunken towards the groove bottom concave surface and extends towards the boss to form an antifriction groove;
Wherein the cutting insert is symmetrically arranged about an angle bisector of the apex angle a.
The concave surface of the groove bottom is recessed in the bottom surface of the groove and extends towards the center of the blade, and the concave surface of the groove bottom can reduce the contact area of the cutting scraps in the process that the cutting scraps flow to the scrap breaking boss. The concave surface of the groove bottom, the boss and the groove bottom surface are in smooth transition through an arc, so that smooth flow of chips is ensured. The antifriction groove can further reduce the chip contact area.
Preferably, the chip flows in a direction perpendicular to the cutting edge in theory, so that in a reference plane parallel to the upper and lower surfaces, the antifriction groove is arranged in the direction of the main cutting edge from the circular arc edge towards the centre of the insert.
Preferably, the maximum depression depth of the antifriction groove is not less than 0.05, and the extension length is not less than 0.2.
Preferably, the number of the antifriction grooves 11 in each cutting unit is not less than 4, the antifriction grooves are respectively arranged symmetrically on two sides of the boss in two groups, and the arrangement interval is more than 0.5mm and less than 1.5mm.
Preferably, in the thickness direction of the insert, the maximum distance from the concave surface 12 of the groove bottom to the concave surface 9 of the groove bottom is h1, in order to ensure that a sufficient clearance distance exists between chips and the concave surface of the groove bottom, h1 is not less than 0.03mm, the distance from the concave surface 9 of the groove bottom to the circular arc cutting edge 8 is h2, when the distance is too small, chip breakage is difficult, when the distance is too large, the contact time of the chips is prolonged, and 0.04-0.18 of the contact time of the chips is prolonged.
Preferably, the chip blocking surface comprises a chip blocking surface A and a chip blocking surface B.
Preferably, the concave groove bottom 12 is gradually narrowed when extending from the chip blocking surface a to the chip blocking surface B near the circular arc cutting edge 41, so as to adapt to different cutting parameters. The chip blocking surface A is formed into a groove with a radius equal to R, R is more than or equal to 0.05mm and less than or equal to 0.8mm in order to make the concave surface of the groove bottom play a better role, and the distance from the lowest point of the groove to the circular arc cutting edge 41 is S in the direction parallel to the upper surface 1, so that the groove can be matched with a chip breaking boss to obtain good chip breaking capacity, and S is more than or equal to 0.7mm and less than or equal to 1.6mm.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, through reasonable arrangement of the bottom surface of the stepped chip breaker and the antifriction groove, the contact area and contact time of the cutting scraps are reduced, so that the heat generated by the friction between the cutting scraps and the blade in the processing process of the blade is reduced, and meanwhile, the heat conduction between the cutting scraps is reduced, and more heat is taken away by the cutting scraps. In addition, the invention considers the requirements of different processing occasions, and the size of the clearance surface is adjusted to ensure that the blade can play a good role in semi-finishing to rough processing.
Drawings
Fig. 1 is a schematic perspective view of a cutting insert according to the present invention.
Fig. 2 is a front view of the cutting insert of the present invention.
Fig. 3 is a top view of a cutting insert of the present invention.
Fig. 4 is an enlarged partial top view of the tip of the cutting insert of the present invention.
FIG. 5 is a cross-sectional view of the cutting insert of the present invention taken along the line J-J
FIG. 6 is a cross-sectional view of the cutting insert of the present invention taken along line K-K
The reference numerals in the figures denote:
1-upper surface, 2-lower surface, 3-side surface, 4-arc surface, 5-rake face, 6-prismatic face, 7-main cutting edge, 8-arc cutting edge, 9-groove bottom surface, 10-boss, 101-chip blocking surface, 11-antifriction groove, 12-installation through hole and 13-groove bottom concave surface.
Detailed Description
The drawings of embodiments of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
Referring to fig. 1 to 6, the present embodiment provides a double-sided slot type indexable cutting insert for semi-finishing to rough machining, having a polygonal vertically symmetrical geometry, in which a mounting through hole 12 is provided at the geometric center of the insert, including an upper surface 1 and a lower surface 2, and a plurality of side surfaces 3 extending therebetween, adjacent side surfaces 3 being transitionally connected by an arc surface 4, in the present embodiment, the insert is an equilateral non-equiangular 6-sided vertically symmetrical geometry, in which three acute angles are 80 ° and three obtuse angles are 160 °. The upper surface 1 or the lower surface 2 is provided with at least 1 vertex angle A, three vertex angles A are provided in the embodiment, the included angle between two adjacent side walls in the vertex angle A is 80 degrees, a boss 10 is arranged between the vertex angle A and the mounting through hole 12, the top plane of the boss 10 is the highest plane on the upper surface 1 or the lower surface 2, and the side surface of the boss 10 is a chip blocking surface 101;
each vertex angle A is provided with a cutting unit, the cutting unit comprises an arc cutting edge 8, a main cutting edge 7 and a chip breaker groove, the arc cutting edge 8 is formed by intersecting an arc surface 4 with the upper surface 1 or the lower surface 2, and the main cutting edge 7 is formed by intersecting a side surface 3 with the upper surface 1 or the lower surface 2; the chip breaker groove comprises an arc cutting edge 8, a land 6, a rake face 5, a groove bottom surface 9, a chip blocking surface 101 and a top plane 10 which are sequentially connected along the direction of the arc cutting edge 8 to the mounting through hole 12, wherein the land 26 and the rake face 5 are in smooth transition through an arc, and the rake face 5 and the groove bottom surface 9 are in smooth transition through an arc; the upper surface 1 or the lower surface 2 is also provided with a groove bottom concave surface 13 which is recessed in the groove bottom surface 9 and extends towards the geometric center of the blade, the groove bottom concave surface 13 is in smooth transition with the boss 10 and the groove bottom surface 9 through circular arcs, and the groove bottom surface 9 is gradually recessed towards the groove bottom concave surface 13 and extends towards the boss 10 to form an antifriction groove 11;
wherein the cutting insert is symmetrically arranged about the corner a bisector.
Referring to fig. 1 and 3, in a reference plane parallel to the upper surface 2 and the lower surface 2, the antifriction grooves 11 are arranged from the circular arc edge 8 toward the center of the insert in the direction of the main cutting edge 7, the number of the arrangement is not less than 2, and 4 antifriction grooves 11 are arranged on each main cutting edge side in this example, the arrangement interval is 1mm. The maximum recess depth of the antifriction groove 11 is not less than 0.05mm, and the extension length is not less than 0.2mm. The depth of the recess in this example is equal to 0.05mm, the extension is greater than 0.4mm, and it extends to the recess bottom 13.
Referring to fig. 5, in the thickness direction of the insert, the maximum distance from the concave surface 13 of the groove bottom to the concave surface 9 of the groove bottom is h1, in order to ensure that a sufficient clearance distance exists between chips and the concave surface of the groove bottom, h1 is not less than 0.03mm, h1=0.05 mm in this example, the distance from the concave surface 9 of the groove bottom to the circular arc cutting edge 8 is h2, h2 is not more than 0.04mm and not more than 0.18mm, the distance is too small, difficulty is caused to chip breaking, the contact time of chips is prolonged, and h2=0.1 mm in this example. .
Referring to fig. 4, the chip blocking surface 101 includes a chip blocking surface a and a chip blocking surface B. The intersection line of the chip blocking surface A and the upper surface 1 or the lower surface 2 is perpendicular to the angular bisector of the vertex angle A, and the included angle between the intersection line of the chip blocking surface B and the upper surface 1 or the lower surface 2 and the angular bisector of the vertex angle A is smaller than 45 degrees, and in the embodiment, the included angle is 24 degrees.
Referring to fig. 5, the concave surface 13 of the groove bottom is gradually narrowed when extending from the chip blocking surface a to the chip blocking surface B near the circular arc cutting edge 8, and becomes a groove with a radius equal to R at the chip blocking surface a, wherein r=0.16 mm is 0.05mm or less and R is 0.8mm or less, the distance from the lowest point of the groove to the circular arc cutting edge 8 is S0.7 mm or less and S1.6 mm or less in the direction parallel to the upper surface 1, and s=1.23 mm is good in the example, and the groove bottom is matched with the chip breaking boss 10.
It is apparent that the above examples are only examples for clearly illustrating the technical solution of the present invention, and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. The double-sided groove type indexable cutting insert for semi-finishing or rough machining is provided with a polygonal geometric structure which is arranged symmetrically up and down, a mounting through hole (12) is formed in the geometric center of the insert, the indexable cutting insert is characterized by comprising an upper surface (1) and a lower surface (2) and a plurality of side surfaces (3) extending between the upper surface and the lower surface, the adjacent side surfaces (3) are in transitional connection through arc surfaces (4), the upper surface (1) or the lower surface (2) is provided with not less than 1 vertex angle A, a boss (10) is arranged between the vertex angle A and the mounting through hole (12), the top plane of the boss (10) is the highest plane on the upper surface (1) or the lower surface (2), and the side surface of the boss (10) is a chip blocking surface (101);
Each vertex angle A is provided with a cutting unit, each cutting unit comprises an arc cutting edge (8), a main cutting edge (7) and a chip breaker groove, the arc cutting edge (8) is formed by intersecting an arc surface (4) with the upper surface (1) or the lower surface (2), and the main cutting edge (7) is formed by intersecting a side surface (3) with the upper surface (1) or the lower surface (2);
The chip breaker groove comprises an arc cutting edge (8), a prismatic surface (6), a rake surface (5), a groove bottom surface (9), a chip blocking surface (101) and a top plane which are sequentially connected along the direction of the arc cutting edge (8) to the mounting through hole (12);
The upper surface (1) or the lower surface (2) is also provided with a groove bottom concave surface (13) which is sunken in the groove bottom surface (9) and extends towards the geometric center of the blade, and the groove bottom concave surface (13) is in smooth transition with the boss (10) and the groove bottom surface (9) through circular arcs; the groove bottom surface (9) gradually dents towards the groove bottom concave surface (13) and extends towards the boss (10) to form an antifriction groove (11), and the antifriction groove (11) is arranged from the circular arc cutting edge (8) to the center of the blade along the main cutting edge direction and is respectively and symmetrically arranged at two sides of the boss;
Wherein the cutting insert is symmetrically arranged about an angle bisector of the apex angle a.
2. The double-sided pocket indexable cutting insert according to claim 1, wherein the land (6) and the rake face (5) are smoothly transitioned by an arc of a circle, and the rake face (5) and the pocket bottom (9) are smoothly transitioned by an arc of a circle.
3. The double sided pocket indexable cutting insert according to claim 1, wherein the antifriction groove (11) has a maximum recess depth of not less than 0.05mm and an extension of not less than 0.2mm.
4. A double sided slot indexable cutting insert according to any one of claims 1-3, wherein the number of antifriction grooves (11) arranged in each cutting unit is not less than 4, the arrangement spacing being greater than 0.5mm, less than 1.5mm.
5. The double-sided pocket indexable cutting insert according to claim 1, wherein the maximum distance from the pocket bottom concave surface (13) to the pocket bottom surface (9) in the insert thickness direction is h1, h1 is not less than 0.03mm, and the distance from the pocket bottom surface (9) to the circular arc cutting edge (8) is h2,0.04mm +.h2 +.18 mm.
6. The double-sided pocket indexable cutting insert according to claim 1, wherein the chip-blocking surface (101) comprises a chip-blocking surface a and a chip-blocking surface B, the intersection of the chip-blocking surface a with the upper surface (1) or the lower surface (2) being perpendicular to the bisector of the apex angle a, the intersection of the chip-blocking surface B with the upper surface (1) or the lower surface (2) being at an angle of less than 45 ° to the bisector of the apex angle a.
7. The double-sided pocket indexable cutting insert according to claim 6, wherein the pocket bottom concave surface (13) becomes narrower as it extends from the chip blocking surface a to the chip blocking surface B near the circular arc cutting edge (8), becomes a groove of a radius equal to R at the chip blocking surface a, R is 0.05 mm.ltoreq.0.8 mm, and the distance from the lowest point of the groove to the circular arc cutting edge (8) is S,0.7 mm.ltoreq.s.ltoreq.1.6 mm in the direction parallel to the upper surface (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711182484.6A CN107775020B (en) | 2017-11-23 | 2017-11-23 | Double-sided groove type indexable cutting blade for semi-finishing or rough machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711182484.6A CN107775020B (en) | 2017-11-23 | 2017-11-23 | Double-sided groove type indexable cutting blade for semi-finishing or rough machining |
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| Publication Number | Publication Date |
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| CN107775020A CN107775020A (en) | 2018-03-09 |
| CN107775020B true CN107775020B (en) | 2024-05-24 |
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| CN201711182484.6A Active CN107775020B (en) | 2017-11-23 | 2017-11-23 | Double-sided groove type indexable cutting blade for semi-finishing or rough machining |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111203554A (en) * | 2019-10-11 | 2020-05-29 | 株洲欧科亿数控精密刀具股份有限公司 | Indexable turning insert with integrated rough machining and finish machining |
| CN115446339B (en) * | 2022-09-28 | 2024-03-08 | 株洲钻石切削刀具股份有限公司 | Indexable turning blade |
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|---|---|---|---|---|
| EP0422586A2 (en) * | 1989-10-11 | 1991-04-17 | Sumitomo Electric Industries, Ltd. | Throw away insert |
| CN103008702A (en) * | 2012-12-24 | 2013-04-03 | 株洲欧科亿硬质合金有限公司 | Polygonal cutting blade for processing soft metal material |
| CN103551615A (en) * | 2013-11-01 | 2014-02-05 | 株洲欧科亿硬质合金有限公司 | Double-sided cutting blade capable of transferring |
| CN205927154U (en) * | 2016-08-18 | 2017-02-08 | 台州市锐安硬质合金工具有限公司 | But transposition turning tool piece |
| CN206500645U (en) * | 2017-02-28 | 2017-09-19 | 哈尔滨理工大学 | 300M unimach DRY CUTTING semifinishing indexable turning blades |
| CN206561130U (en) * | 2017-01-19 | 2017-10-17 | 株洲欧科亿数控精密刀具股份有限公司 | A kind of two-sided roughing cutting tip |
| CN107363276A (en) * | 2017-08-31 | 2017-11-21 | 株洲欧科亿数控精密刀具股份有限公司 | A kind of two-sided groove profile Indexable cutting inserts |
| CN207606294U (en) * | 2017-11-23 | 2018-07-13 | 株洲欧科亿数控精密刀具股份有限公司 | A kind of semifinishing or the two-sided groove profile Indexable cutting inserts of roughing |
-
2017
- 2017-11-23 CN CN201711182484.6A patent/CN107775020B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0422586A2 (en) * | 1989-10-11 | 1991-04-17 | Sumitomo Electric Industries, Ltd. | Throw away insert |
| CN103008702A (en) * | 2012-12-24 | 2013-04-03 | 株洲欧科亿硬质合金有限公司 | Polygonal cutting blade for processing soft metal material |
| CN103551615A (en) * | 2013-11-01 | 2014-02-05 | 株洲欧科亿硬质合金有限公司 | Double-sided cutting blade capable of transferring |
| CN205927154U (en) * | 2016-08-18 | 2017-02-08 | 台州市锐安硬质合金工具有限公司 | But transposition turning tool piece |
| CN206561130U (en) * | 2017-01-19 | 2017-10-17 | 株洲欧科亿数控精密刀具股份有限公司 | A kind of two-sided roughing cutting tip |
| CN206500645U (en) * | 2017-02-28 | 2017-09-19 | 哈尔滨理工大学 | 300M unimach DRY CUTTING semifinishing indexable turning blades |
| CN107363276A (en) * | 2017-08-31 | 2017-11-21 | 株洲欧科亿数控精密刀具股份有限公司 | A kind of two-sided groove profile Indexable cutting inserts |
| CN207606294U (en) * | 2017-11-23 | 2018-07-13 | 株洲欧科亿数控精密刀具股份有限公司 | A kind of semifinishing or the two-sided groove profile Indexable cutting inserts of roughing |
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| CN107775020A (en) | 2018-03-09 |
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Address after: 412500 Yanling small and medium enterprises Pioneering Park, Yanling, Zhuzhou, China Applicant after: OKE PRECISION CUTTING TOOLS Co.,Ltd. Address before: 412000 No. four Chuang four road, Tung Jia hi high tech park, Zhuzhou, Hunan Applicant before: OKE PRECISION CUTTING TOOLS Co.,Ltd. |
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