CN107414114B - Double-sided indexable turning blade for rough machining of high-temperature alloy - Google Patents
Double-sided indexable turning blade for rough machining of high-temperature alloy Download PDFInfo
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- CN107414114B CN107414114B CN201710883716.4A CN201710883716A CN107414114B CN 107414114 B CN107414114 B CN 107414114B CN 201710883716 A CN201710883716 A CN 201710883716A CN 107414114 B CN107414114 B CN 107414114B
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- 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
- B23B2200/321—Chip breaking or chip evacuation by chip breaking projections
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
The invention discloses a double-sided indexable turning blade for rough machining of high-temperature alloy, wherein at least 1 vertex angle is arranged on the blade, a first protruding part is arranged between the vertex angle and the center of the blade, the highest plane on the first protruding part is a top plane, each vertex angle is provided with a cutting unit, each cutting unit comprises an arc cutting edge, a main cutting edge and a chip breaker groove, each chip breaker groove comprises an arc cutting edge, a first rake face, a second rake face, a chip breaker groove bottom, a concave chip breaker and a top plane, which are sequentially connected along the direction of the arc cutting edge to a blade positioning center hole, and the concave chip breaker is an inward concave spherical surface between the top plane and the upper surface or the lower surface. The turning blade can effectively control the curling and breaking of the cutting chips and smoothly remove the chips; the indexable insert has high cutting edge strength, can bear large cutting resistance and large chip containing space, can effectively relieve the cutting temperature during processing, and is suitable for rough machining of high-temperature alloy with uniform and nonuniform blank allowance.
Description
Technical Field
The present invention relates to a turning tool in the field of metal cutting machining, and more particularly to a turning insert for roughing superalloys.
Background
In the prior art, indexable double-sided slot type cutting inserts are common cutting inserts, and along with the requirements of users on the surface quality of a workpiece to be processed and the requirements on the service life of the indexable inserts when processing workpieces with uneven blank allowance, the indexable double-sided slot type cutting inserts are more and more high.
Because the superalloy is difficult to process, the cutting edge is too sharp, and the tool tip is easy to collapse; the strength of the tool nose is too high, and the cutting resistance is large, so that the abrasion of the rear tool face of the turning blade is accelerated, and the service life of the blade is influenced.
In the rough machining of cemented carbide indexable numerically controlled turning inserts with multiple cutting units are typically used, which are indexable with one tip worn and the other tip, and which are typically discarded without regrinding after dulling. The front end of the cutting edge of the blade is provided with a negative rake angle, so the defects of high cutting resistance, unstable chip discharging direction, overhigh temperature of the cutting tip and the like which influence the service life of the blade are overcome, and particularly, the problems of high cutting temperature, serious processing and cutting hardening, easy formation of built-up chips, high plastic deformation resistance, difficult guarantee of surface quality and precision and the like exist in the cutting process of high-hardness and high-viscosity metal materials.
Disclosure of Invention
In view of the above problems, the present invention provides a double-sided indexable turning insert for roughing superalloys, which has a capability of effectively controlling curling and breaking of chips and smoothly discharging chips; the indexable insert has high cutting edge strength, can bear large cutting resistance and large chip containing space, can effectively relieve the cutting temperature during processing, and is suitable for rough machining of high-temperature alloy with uniform and nonuniform blank allowance.
In order to solve the technical problems, the invention adopts the following technical scheme:
the double-sided indexable turning blade for rough machining of the superalloy is characterized in that the blade body is a polygonal body, a blade positioning center hole positioned in the geometric center of the blade body is formed in the blade body, and the blade body comprises an upper surface, a lower surface, at least three side surfaces and an arc surface connected with the side surfaces; the upper surface and the lower surface are provided with not less than 1 vertex angle A; a first protruding part is arranged between each vertex angle A and the blade positioning center hole, the first protruding parts are uniformly distributed along the periphery of the blade positioning center hole, and the highest plane on the first protruding parts is a top plane; a chip pocket is arranged between the first protruding part and the edge of the blade;
each vertex angle A is provided with a cutting unit, each cutting unit comprises an arc cutting edge, a main cutting edge and a chip breaker groove, the arc cutting edge is formed by intersecting an arc surface with the upper surface, and the main cutting edge is formed by intersecting a side surface with the upper surface;
the chip breaker comprises an arc cutting edge, a first front cutter surface, a second front cutter surface, a chip breaker bottom, a concave chip breaker and a top plane which are sequentially connected along the direction from the arc cutting edge to the blade positioning center hole; the concave chip breaker is arranged on the first protruding part;
wherein: the concave chip breaker is an inward concave spherical surface between the top plane and the upper surface or the lower surface.
Preferably, the included angle between the first rake face and the upper surface is a first rake angle alpha, and the included angle is 2-10 degrees; the included angle between the second rake face and the upper surface is a second rake angle beta, and beta is 15-25 degrees.
Preferably, the radius R1 of the concave spherical surface is 0.5 mm-2.5 mm.
Preferably, the concave spherical surface intersects the top plane to form a concave circular arc R2.
Further preferably, the plane of the top plane is taken as a reference plane, and the longest distance d between the concave circular arc R2 and the projection circular arc of the circular arc cutting edge on the reference plane is 1.5 mm-2.5 mm.
Preferably, the top plane is composed of an upper section concave circular arc R2, a lower section concave circular arc R3, concave circular arcs R4 of two side surfaces and four transition circular arcs therebetween, and the concave circular arc R2 is formed by intersecting a concave chip breaker with the top plane.
Further preferably, a straight line perpendicular to an angular bisector of the vertex angle A is taken as a reference line, and the projection width of the concave circular arc R2 on the reference line is 1/6-1/3 of the projection width of the lower concave circular arc R3 on the reference line; the shortest distance between the concave circular arc R2 and the lower section concave circular arc R is b2, and b2 is 1-5 mm. .
Preferably, the bottom of the chip breaker is parallel to the upper surface, and is higher than the bottom of the chip breaker; preferably, the height difference between the bottom of the chip breaker and the bottom of the chip breaker is h, and the h is 0-0.2 mm; preferably 0.02 to 0.1mm.
Preferably, the width of the bottom of the chip breaker along the direction of the main cutting edge is b1, and b1 is 0.5-5 mm; preferably 2 to 4mm.
Preferably, the first rake surface comprises a gradual change section, the gradual change section starts from an intersection point of the circular cutting edge and the main cutting edge, the width of the gradual change section gradually increases from the intersection point to the main cutting edge, the length of the gradual change line is d1, and the d1 is 0-5 mm.
Preferably, no less than one second protruding part is arranged between every two adjacent first protruding parts, and the second protruding parts are uniformly distributed along the central positioning hole in a 'water drop shape'; preferably, the number of the second protrusions is 3. The second protrusion has positioning function.
Preferably, the bottom of the chip flute is provided with at least 3 circular protrusions.
Further preferably, the number of the circular protrusions is 3, including a circular protrusion I, a circular protrusion II and a circular protrusion III, and the 3 circular protrusions are arranged in a triangle.
Still further preferably, the radius and the height of the circular protrusion I and the circular protrusion II are identical, the radius and the height of the circular protrusion III are larger than those of the circular protrusion I and the circular protrusion II, the radius difference between the circular protrusion III and the circular protrusion I and the circular protrusion II is 0.05-0.2, and the height difference is 0.02-0.2 mm.
It is further preferable that the plane where the top plane is located is taken as a reference plane, distances from the center of projection of the circular protrusion one or the circular protrusion two on the reference plane to the furthest point of the projected arc of the arc cutting edge in the main cutting edge direction are d 2mm to 4mm, distances from the center of projection of the circular protrusion three on the reference plane to the furthest point of the projected arc of the arc cutting edge in the main cutting edge direction are d3, d3 is 2mm to 4mm, and d3> d2.
Compared with the prior art, the invention has the beneficial effects that:
the cutting edge of the double-sided indexable turning blade for rough machining of the high-temperature alloy is sharp, and the cutting edge has a certain width, so that the sharpness and strength of the cutting edge of the cutter are effectively balanced. The bottom surface of the chip breaker adopts a plane shape, so that the defect of high cutting temperature during high-temperature alloy processing can be effectively alleviated, and the wear resistance of the blade can be greatly improved due to the large chip containing space, thereby fully meeting the use requirements of customers.
According to the turning blade, the lug boss with the inclination angle is arranged in the chip breaker groove behind the arc of the tool nose, so that the strength of the cutting edge is ensured; the turning blade adopts double rake cutting edges, and the sharpness and strength of the cutting edge are both considered, so that the temperature of the cutting edge is reduced; the circular arc chip blocking table can enable chips to flow out along a curved surface, so that cutting force is reduced; the chip pocket behind the cutting edge is internally provided with the small bulge, so that the contact area and friction force between chips and the blade are reduced, the main cutting force is reduced, and the heat dissipation is facilitated; the invention has the advantages of relatively small cutting force and blade abrasion during working, low cutting temperature, long service life of the blade and good chip breaking and removing effects.
Drawings
Fig. 1 is a perspective view of the indexable cutting insert of the present invention.
Fig. 2 is a front view of the indexable cutting insert of the present invention.
Fig. 3 is an enlarged view of a portion D of the cutting insert shown in fig. 2.
Fig. 4 is a cross-sectional view of the cutting insert of fig. 2 taken along line C-C.
Fig. 5 is a cross-sectional view of the cutting insert shown in fig. 3 taken along line E-E.
In the figure: 1-an insert body, 2-a lower surface, 3-an upper surface, 4-an arc surface, 5-a side surface, 6-a chip breaker, 7-a cutting edge, 7 a-an arc cutting edge, 7 b-a main cutting edge, 8-a first rake surface, 9-a second rake surface, 10-a chip breaker bottom, 11-a concave chip breaker, 12-a chip breaker, 13-a second protrusion, 14-a circular protrusion, 141-a first circular protrusion, 142-a second circular protrusion, 143-a third circular protrusion, 15-a center hole, P-a corner angle a bisector, 16-a first protrusion, 17-a top plane.
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 5, the present embodiment provides a double-sided indexable turning insert for roughing superalloys, the insert body 1 is a polygonal body, the insert body 1 is provided with an insert positioning center hole 15 located at the geometric center thereof, the insert body 1 includes an upper surface 3, a lower surface 2, three side surfaces 5, and an arc surface 4 connecting the side surfaces 5; twelve separated protruding parts are arranged on the periphery of the blade positioning center hole 15 of the upper surface 3, and each protruding part comprises 3 protruding parts I16 which are symmetrically arranged and 9 protruding parts II 13 which are symmetrically arranged in a 'water drop shape'; the upper surface 3 is provided with 3 vertex angles A;
each vertex angle a is provided with a cutting unit comprising a cutting edge 7 (an arc cutting edge 7a, a main cutting edge 7 b) and a chip breaker groove 6, wherein the arc cutting edge 7a is formed by intersecting the arc surface 4 with the upper surface 3, the main cutting edge 7b is formed by intersecting the side surface 5 with the upper surface 3, and the chip breaker groove 6 is arranged on an angle bisector P and near the arc cutting edge 7 a;
the chip breaker 6 comprises an arc cutting edge 7a, a first rake surface 8, a second rake surface 9, a chip breaker bottom 10, a concave chip breaker 11 and a top plane 17 which are sequentially connected from the arc cutting edge 7a to the direction of the insert positioning center hole 15; the first rake surface 8 has a first rake angle α with the upper surface 3, the first rake angle α being 2 ° to 10 °, preferably 3 ° to 7 °, in this embodiment α being 5 °; the second rake surface 9 is at a second rake angle beta with the upper surface 3, which is 15 deg. to 25 deg., preferably 16 deg. to 20 deg., in this embodiment beta is 18 deg..
Wherein: the top plane 17 is the highest plane on the projection one 16, and the concave chipbreaker 11 is provided on the projection one 16. The concave chip breaker 11 is an inwardly concave spherical surface, the radius R1 of the spherical surface is 0.5 mm-2.5 mm, and most preferably 0.8-1.5 mm, and in this embodiment, R1 is 1.5mm.
The concave spherical surface intersects with the top plane 17 to form a concave circular arc R2; the longest distance d between the concave circular arc R2 and the projected circular arc of the circular arc cutting edge 7a on the reference plane is 1.5mm to 2.5mm with the plane of the top plane 17 as the reference plane, and in this embodiment, d is 2.4mm.
The top plane 17 is composed of an upper section concave circular arc R2, a lower section concave circular arc R3, concave circular arcs R4 of two side surfaces and four transition circular arcs therebetween, and the concave circular arc R2 is formed by intersecting a concave chip breaker 11 with the top plane 17.
Taking a straight line perpendicular to an angular bisector of the vertex angle A as a datum line, wherein the projection width of the concave circular arc R2 on the datum line is 1/6-1/3 of the projection width of the lower concave circular arc R3 on the datum line, and the preferred embodiment is 1/4; the shortest distance between the concave circular arc R2 and the lower section concave circular arc R is b2, and b2 is 1-5 mm; preferably 2 to 3.5mm, in this example b2 is 3.2mm.
The chip breaker bottom 10 and the chip breaker bottom 12 are parallel to the upper surface 3, and the chip breaker bottom 10 is higher than the chip breaker bottom 12; the height difference between the chip breaker bottom 10 and the chip breaker bottom 12 is h, wherein h is 0-0.2 mm; preferably 0.02 to 0.1mm, in this example d2 is 0.05mm.
The width of the chip breaker bottom 10 along the direction of the main cutting edge 7b is b1, b1 is 0.5 to 5mm, preferably 2 to 4mm, and in this embodiment b1 is 3.2mm.
The first rake surface 8 includes a gradual change section, the gradual change section starts from the intersection point of the circular arc cutting edge 7a and the main cutting edge 7b, the width of the gradual change section gradually increases from the intersection point to the main cutting edge 7b direction, the length of the gradual change line is d1, d1 is 0-5 mm, and optimally 2-4 mm, and in this embodiment, d1 is 3mm.
The bottom of the chip flute is provided with 3 circular protrusions 14, and the circular protrusions 14 comprising a circular protrusion one 141, a circular protrusion two 142 and a circular protrusion three 143,3 are arranged in a triangle. The radius and the height of the circular protrusion one 141 and the circular protrusion two 142 are consistent, the radius and the height of the circular protrusion three 143 are larger than those of the circular protrusion one 141 and the circular protrusion two 142, the radius difference between the circular protrusion three 143 and the circular protrusion two 142 and the circular protrusion one 141 is 0.05-0.2 mm, preferably 0.08-0.15 mm, in this embodiment 0.1, the height difference is 0.02-0.2 mm, preferably 0.05-0.15 mm, and in this embodiment 0.08.
Taking the plane of the top plane 17 as a reference plane, the distance from the projection center of the circular projection one 141 or the circular projection two 142 on the reference plane to the projection arc most distal point of the arc cutting edge 7a in the direction of the main cutting edge 7b is d2, d2 is 2 mm-4 mm, and d2 is 3.1mm in the embodiment; the distance from the center of the projection of the circular protrusion three 143 on the reference plane to the furthest point of the projection arc of the arc cutting edge 7a in the direction of the main cutting edge (7 b) is d3, d3 is 2 mm-4 mm, and d3 is 3.8mm in the embodiment.
The cutting blade with the groove type parameters has the advantages that the sharpness and the strength of the cutting edge are considered, and the cutting blade has wide chip breaking grooves and large chip containing grooves, so that the curling and breaking of chips can be well guided when high-temperature alloy is cut, the wear resistance of the indexable blade is well improved, and the requirements of customers are met.
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 (16)
1. The double-sided indexable turning blade for rough machining of high-temperature alloy is characterized in that the blade body (1) is a polygonal body, a blade positioning center hole (15) positioned in the geometric center of the blade body is formed in the blade body (1), and the blade body (1) comprises an upper surface (3), a lower surface (2), at least three side surfaces (5) and an arc surface (4) connected with the side surfaces (5); the upper surface (3) and the lower surface (2) are provided with not less than 1 vertex angle (A); a first protruding part (16) is arranged between each vertex angle (A) and the blade positioning center hole (15), the first protruding parts (16) are uniformly distributed along the periphery of the blade positioning center hole (15), and the highest plane on the first protruding parts (16) is a top plane (17); a chip flute (12) is arranged between the first protruding part (16) and the edge of the blade;
each vertex angle (A) is provided with a cutting unit, the cutting unit comprises an arc cutting edge (7 a), a main cutting edge (7 b) and a chip breaker groove (6), the arc cutting edge (7 a) is formed by intersecting an arc surface (4) with the upper surface (3), and the main cutting edge (7 b) is formed by intersecting a side surface (5) with the upper surface (3);
the chip breaker groove (6) comprises an arc cutting edge (7 a), a first front tool face (8), a second front tool face (9), a chip breaker groove bottom (10), a concave chip breaker (11) and a top plane (17) which are sequentially connected along the direction from the arc cutting edge (7 a) to the blade positioning center hole (15); the concave chip breaker (11) is arranged on the first protruding part (16);
wherein: the top plane (17) consists of an upper section concave circular arc R2, a lower section concave circular arc R3, concave circular arcs R4 of two side surfaces and four transition circular arcs therebetween, and the concave circular arc R2 is formed by intersecting a concave chip breaker (11) with the top plane (17); taking a straight line perpendicular to an angular bisector of the vertex angle (A) as a datum line, wherein the projection width of the concave circular arc R2 on the datum line is 1/6-1/3 of the projection width of the lower concave circular arc R3 on the datum line; the shortest distance between the concave arc R2 and the lower section concave arc R is b2, and b2 is 1-5 mm;
the concave chip breaker (11) is an inward concave spherical surface between the top plane (17) and the upper surface (3) or the lower surface (2), and the radius R1 of the concave chip breaker (11) is 0.5-2.5 mm.
2. A double-sided indexable turning insert for roughing superalloys according to claim 1, characterized in that the angle between the first rake surface (8) and the upper surface (3) is a first rake angle α, α being 2-10 °; the included angle between the second rake face (9) and the upper surface (3) is a second rake angle beta, and beta is 15-25 degrees.
3. A double-sided indexable turning insert for roughing superalloys according to claim 2, characterized in that the angle between the first rake surface (8) and the upper surface (3) is 3-7 ° with respect to the first rake angle α; the included angle between the second rake face (9) and the upper surface (3) is 16-20 degrees, and the second rake angle beta is the second rake angle beta.
4. A double sided indexable turning insert for roughing superalloys according to claim 1, characterized in that the concave chipbreaker (11) intersects the top plane (17) to form a concave arc R2; the plane of the top plane (17) is taken as a reference plane, and the longest distance d between the concave circular arc R2 and the projection circular arc of the circular arc cutting edge (7 a) on the reference plane is 1.5 mm-2.5 mm.
5. A double sided indexable turning insert for roughing superalloys according to claim 1, characterized in that the chip breaker bottom (10), the chip breaker (12) bottom are parallel to the upper surface (3), and the chip breaker bottom (10) is higher than the chip breaker (12) bottom.
6. A double sided indexable turning insert for roughing superalloys according to claim 5, characterized in that the difference in height between the chip breaker bottom (10) and the chip flute (12) bottom is h, which h is 0-0.2 mm.
7. A double sided indexable turning insert for roughing superalloys according to claim 6, characterized in that the difference in height h between the chip breaker bottom (10) and the chip flute (12) bottom is 0.02-0.1 mm.
8. A double sided indexable turning insert for roughing superalloys according to claim 1, characterized in that the chip breaker bottom (10) has a width b1 in the direction of the main cutting edge (7 b), said b1 being 0.5-5 mm.
9. A double sided indexable turning insert for roughing superalloys according to claim 8, characterized in that the chip breaker bottom (10) has a width b1 in the direction of the main cutting edge (7 b) of 2-4 mm.
10. A double sided indexable turning insert for roughing superalloys according to claim 1, characterized in that the first rake surface (8) comprises a transition starting from the intersection of the circular cutting edge (7 a) and the main cutting edge (7 b), the width of which gradually increases from the intersection in the direction of the main cutting edge (7 b), the length of which is d1, the d1 being 0-5 mm.
11. A double sided indexable turning insert for roughing superalloys according to claim 1, wherein no less than one second protrusion (13) is provided between each adjacent first protrusion (16), the second protrusions (13) being evenly distributed along the locating center hole (15) in the form of "water droplets".
12. A double sided indexable turning insert for roughing superalloys according to claim 11, wherein the number of protrusions two (13) is 3.
13. A double sided indexable turning insert for roughing superalloys according to claim 1, characterized in that the chip flute (12) bottom is provided with at least 3 rounded protrusions (14).
14. A double sided indexable turning insert for roughing superalloys according to claim 13, wherein the number of rounded protrusions (14) is 3, including rounded protrusion one (141), rounded protrusion two (142) and rounded protrusion three (143), and 3 of the rounded protrusions (14) are arranged in a triangle.
15. The double sided indexable turning insert for roughing a superalloy according to claim 14 wherein the radius and height of the first and second circular protrusions (141, 142) are uniform, the radius and height of the third circular protrusion (143) are greater than the first and second circular protrusions (141, 142), the radius difference between the third circular protrusion (143) and the first and second circular protrusions (141, 142) is 0.05-0.2, and the height difference is 0.02-0.2 mm.
16. A double sided indexable turning insert for roughing superalloys according to claim 15, characterized in that the distance from the centre of projection of the circular projection one (141) or the circular projection two (142) on the reference surface to the furthest point of the projected arc of the arc cutting edge (7 a) in the direction of the main cutting edge (7 b) is d2 and d2 is 2mm to 4mm, the distance from the centre of projection of the circular projection three (143) on the reference surface to the furthest point of the projected arc of the arc cutting edge (7 a) in the direction of the main cutting edge (7 b) is d3 and d3 is 2mm to 4mm, and d3> d2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710883716.4A CN107414114B (en) | 2017-09-26 | 2017-09-26 | Double-sided indexable turning blade for rough machining of high-temperature alloy |
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| CN201710883716.4A CN107414114B (en) | 2017-09-26 | 2017-09-26 | Double-sided indexable turning blade for rough machining of high-temperature alloy |
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| US11446745B2 (en) | 2018-09-27 | 2022-09-20 | Iscar, Ltd. | Turning insert having peninsula and island protrusions, and turning tool |
| WO2020114006A1 (en) * | 2018-12-06 | 2020-06-11 | 株洲欧科亿数控精密刀具股份有限公司 | Turning blade for stainless steel flange |
| CN112475340A (en) * | 2020-12-07 | 2021-03-12 | 哈尔滨理工大学 | High-efficient chip breaking antifriction two-sided rhombus lathe tool piece under high pressure cooling |
| CN114951725A (en) * | 2022-05-16 | 2022-08-30 | 株洲肯特硬质合金股份有限公司 | Indexable turning blade |
| 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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| CN107414114A (en) | 2017-12-01 |
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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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