CN112045227B - Peripheral drilling blade and drilling tool thereof - Google Patents
Peripheral drilling blade and drilling tool thereof Download PDFInfo
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- CN112045227B CN112045227B CN202010732180.8A CN202010732180A CN112045227B CN 112045227 B CN112045227 B CN 112045227B CN 202010732180 A CN202010732180 A CN 202010732180A CN 112045227 B CN112045227 B CN 112045227B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/04—Angles, e.g. cutting angles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/08—Side or plan views of cutting edges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/20—Number of cutting edges
- B23B2251/204—Four cutting edges
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Abstract
The invention discloses a peripheral drilling blade and a drilling tool thereof, wherein the peripheral drilling blade comprises a blade body; the insert body has an upper surface, a bottom surface and side surfaces; the upper surface and the side surface are intersected to form four cutting edges corresponding to the quadrangle; each cutting edge comprises a cutting edge section, a smoothing edge section and a transition arc edge section which are connected in sequence; the side surface of the blade body is provided with a blade positioning surface, a grindable surface, an avoiding surface and a transition surface corresponding to each cutting edge; the grindable surface and the insert locating surface are disposed out of plane. The invention utilizes the arranged grindable surface to adjust the processing size of the drilling tool through simple sharpening, thereby leading the drilling tool to have wider application range, not influencing the service life and the performance of the tool, and simultaneously leading the sharpened peripheral drilling blade of the hard alloy to have more stable size precision.
Description
Technical Field
The invention relates to the technical field of cutters, in particular to a peripheral drilling blade and a drilling cutter thereof.
Background
With the increasing updating and upgrading of mechanical manufacturing and processing equipment, the matched processing cutter is gradually changed from the traditional high-speed steel cutter to the hard alloy numerical control cutter, and the hard alloy numerical control cutter has higher processing efficiency, longer processing life and higher processing quality.
The hard alloy numerical control cutter can be divided into an integral type and a blade type, wherein the integral type is usually formed by grinding a bar, the blade type is usually formed by pressing, and the structure and the application of the hard alloy numerical control cutter are various. The hard alloy numerical control blade is connected with a knife handle or a numerical control machine tool by means of clamping with a high-speed steel knife rod, and an indexable shallow hole drill tool is one of the tools.
The indexable shallow hole drill is also called as a U-drill, the head of the drill bit is embedded with a plurality of hard alloy drilling blades, usually two hard alloy drilling blades are embedded, one is a drilling blade for removing inner materials and is also called as a central drilling blade, the other is a drilling blade for removing peripheral materials and is also called as a peripheral drilling blade, and the handle part and the rod part are made of high-speed steel. The hard alloy blade is provided with a plurality of blade cutting edges generally, and the currently used blade cutting edge can be converted into the other blade cutting edge to be continuously used after being worn, so that the indexable shallow hole drill has the characteristics of convenience in use, high machining efficiency, good economy and the like. Meanwhile, the indexable shallow hole drill can be used in a machining center, namely, a cutter rotates to machine, and can also be used on a lathe, namely, a workpiece rotates to machine, and boring or reaming can also be carried out, so that the indexable shallow hole drill is wide in universality and is more and more popular in mechanical machining.
After the hard alloy drilling blade is installed on the drill rod, the size is fixed. Most manufacturers use a single blade to provide a range of dimensional tolerances, such as manufacturing to an upper tolerance or a lower tolerance. At present, one method is to adjust the size of the drill bit by using an eccentric sleeve, the method needs an auxiliary part of the eccentric sleeve, is complex to use and high in cost, and the additional eccentric sleeve destroys the balance position structure of the original blade embedded in a drill rod, generally needs to reduce cutting parameters, thereby reducing the processing efficiency; the other mode is that the drill rod with the required size is manufactured in a non-calibration mode, the specification of the drill rod in the non-calibration mode is determined, the application range is small, and the required manufacturing period is long.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a peripheral drilling blade and a drilling tool thereof, which utilize the arranged grindable surface to adjust the machining size of the drilling tool through simple sharpening, so that the drilling tool has a wider application range, the service life and the performance of the tool are not influenced, and meanwhile, the sharpened hard alloy peripheral drilling blade has more stable size precision.
The technical scheme adopted by the invention for solving the technical problems is as follows: a peripheral drill insert comprising an insert body having a generally quadrilateral shape; the insert body having an upper surface, a bottom surface, and side surfaces; the upper surface and the side surface are intersected to form four cutting edges corresponding to the quadrangle; each cutting edge comprises a cutting edge section, a smoothing edge section and a transition arc edge section which are sequentially connected, and the transition arc edge section corresponds to the corner position of the blade body; the side surface of the blade body is provided with a blade positioning surface, a grindable surface, an avoiding surface and a transition surface corresponding to each cutting edge, wherein the blade positioning surface, the grindable surface and the transition surface respectively correspond to the cutting edge section, the dressing edge section and the transition arc edge section, and the avoiding surface is arranged at the lower part of the grindable surface; the grinding surface and the blade positioning surface are not coplanar, the intersection point position of the smoothing edge section and the transition arc edge section can be changed by grinding the grinding surface, and the intersection point position is the processing diameter of the drilling tool after the peripheral drilling blade is assembled.
The blade body is square.
The cutting edge section and the trimming edge section are respectively straight line sections, and the transition arc edge section is an arc line section; the cutting edge section and the trimming edge section form an included angle alpha, and the included angle alpha ranges from 3 degrees to 6 degrees.
Adjacent light-trimming edge sections of the four cutting edges are perpendicular to each other; the length of the smoothing edge section is set to be 10% -20% of the diameter of the quadrilateral inscribed circle.
The bottom surface of the blade body is a plane, the blade positioning surface and the bottom surface of the blade form an included angle beta, and the included angle beta ranges from 95 degrees to 105 degrees.
The grindable surface and the bottom surface of the blade body form an included angle gamma which ranges from 95 degrees to 105 degrees.
The middle of the blade body is provided with a screw hole penetrating through the upper surface and the bottom surface of the blade body; a first upper surface, an inclined surface and a second upper surface are sequentially arranged in the upper surface of the insert body from the cutting edge to the screw hole direction; the first upper surface is a plane or an inclined plane, and the second upper surface is a plane; the first upper surface and the inclined surface constitute a chip breaker groove of the blade.
A drilling tool comprises a high-speed steel drill rod, a central drilling blade and the peripheral drilling blade; the high-speed steel drill rod is provided with a central cutter groove close to the central axis of the high-speed steel drill rod and a peripheral cutter groove far away from the central axis; the central drilling blade and the peripheral drilling blade are respectively fixed in the central cutter groove and the peripheral cutter groove through locking screws, and the smoothing blade section of the peripheral drilling blade forms an included angle delta with the central axis of the high-speed steel drill rod, wherein the included angle delta ranges from 0.5 degrees to 2 degrees; the cutting edge sections of the peripheral drilling blades form an included angle epsilon with the central axis of the high-speed steel drill rod, and the included angle epsilon ranges from 3.5 degrees to 8 degrees.
Compared with the prior art, the invention has the beneficial effects that:
the side surface of the blade body is provided with a blade positioning surface, a grindable surface, an avoiding surface and a transition surface corresponding to each cutting edge, wherein the blade positioning surface, the grindable surface and the transition surface respectively correspond to the cutting edge section, the dressing edge section and the transition arc edge section, and the avoiding surface is arranged at the lower part of the grindable surface; the grinding surface and the blade positioning surface are not coplanar, the intersection point position of the smoothing edge section and the transition arc edge section can be changed by grinding the grinding surface, and the intersection point position is the processing diameter of the drilling tool after the peripheral drilling blade is assembled. The structure of the invention utilizes the arranged grindable surface to adjust the processing size of the drilling tool through simple sharpening, thereby leading the drilling tool to have wider application range without influencing the service life and the performance of the tool, and simultaneously leading the peripheral drilling blade of the hard alloy after sharpening to have more stable size precision. The invention forms various dimensional tolerance ranges through different sizes before and after sharpening, and has stable service performance and short manufacturing period. In addition, compared with the drill rod with a non-standard size, the structure has wide applicability, namely the blade can be arranged on the drill rods with different specifications, so that the machining sizes of various specifications can be obtained, and the manufacturing period is shorter.
The invention is further explained in detail with the accompanying drawings and the embodiments; a peripheral drill insert and a drill tool therefor of the present invention are not limited to the embodiments.
Drawings
FIG. 1 is an axial schematic view of a peripheral drill insert of an embodiment of the present invention;
FIG. 2 is a front view of the cutting edge segment of the peripheral drill insert of an embodiment of the present invention, perpendicular to the plane of the paper;
FIG. 3 is a front view of the wiper edge section of a peripheral drill insert of an embodiment of the present invention, perpendicular to the plane of the paper;
FIG. 4 is a top view of a peripheral drill insert of an embodiment of the present invention;
FIG. 5 is an axial view of a drill tool of an embodiment of the present invention;
FIG. 6 is an axial schematic view of a high speed steel drill rod of the drilling tool of an embodiment of the present invention;
FIG. 7 is an enlarged partial schematic view of a drill tool of an embodiment of the present invention;
FIG. 8 is a shaft side view of a peripheral drill insert having a ground grindable surface in accordance with an embodiment of the present invention;
fig. 9 is a top view of the peripheral drill blade before and after sharpening of the grindable face of the embodiment of the present invention.
In the figure, 3, the insert body of the peripheral drill insert; 10. a cutting edge; 20. a side of the blade body; 30. an upper surface of the insert body; 40. a screw hole of the insert body; 50. a bottom surface of the blade body; 201. a positioning surface of the blade body; 202. a grindable face of the blade body; 203. an avoidance surface of the blade body; 204. a transition surface of the blade body; 101. a cutting edge section; 102. trimming the edge section; 103. a transitional arc edge section; 104. the intersection point of the smoothing edge section and the transition arc edge section; 301. a first upper surface; 302. an inclined surface; 303. a second upper surface; 401. a screw hole inclined plane; 402. the arc surface of the screw hole; 403. screw hole vertical surfaces; D. drilling the machining diameter of the cutter; w, the length of the edge trimming section; d. the diameter of an inscribed circle of the blade body quadrangle; alpha, the included angle between the cutting edge section and the trimming edge section; beta, the included angle between the positioning surface of the blade body and the bottom surface of the blade; gamma, the included angle between the grinding surface of the blade body and the bottom surface of the blade; 1. a high speed steel drill pipe; 2. a center drill insert; 4. locking the screw; 12. a central cutter slot of the high-speed steel drill rod; 13. a peripheral cutter groove of the high-speed steel drill rod; 14. a central chip groove of the high-speed steel drill rod; 15. peripheral chip removal grooves of the high-speed steel drill rod; 131. a first side positioning surface of a peripheral cutter groove of the high-speed steel drill rod; 132. a second side positioning surface of a peripheral cutter groove of the high-speed steel drill rod; 133. the bottom surface of a peripheral cutter groove of the high-speed steel drill rod; delta, the included angle between the trimming edge section and the central axis of the drill rod; epsilon, the included angle between the cutting edge section and the central axis of the drill rod; m, grinding amount.
Detailed Description
Examples
Referring to fig. 1 to 4, a peripheral drill insert of the present invention comprises an insert body 3 of substantially quadrangular shape; the insert body 3 has an upper surface 30, a bottom surface 50 and side surfaces 20 (also the flank surfaces of the peripheral drill insert); the upper surface 30 and the side surface 20 intersect to form four cutting edges 10 corresponding to a quadrangle; each cutting edge 10 comprises a cutting edge section 101, a smoothing edge section 102 and a transition arc edge section 103 which are sequentially connected, and the transition arc edge section 103 corresponds to the corner position of the blade body 3; in the side surface 20 of the blade body 3, a blade positioning surface 201, a grindable surface 202, an avoiding surface 203 and a transition surface 204 are arranged corresponding to each cutting edge 10, wherein the blade positioning surface 201, the grindable surface 202 and the transition surface 204 respectively correspond to the cutting edge section 101, the smoothing edge section 102 and the transition arc edge section 103, and the avoiding surface 203 is arranged at the lower part of the grindable surface 202; the grindable surface 202 and the insert positioning surface 201 are not coplanar, and the position of the intersection 104 of the wiper edge section 102 and the transition arc edge section 103 can be changed by grinding the grindable surface 202, and the intersection 104 is the machining diameter D of the drilling tool (in this embodiment, an indexable shallow hole drill) with the peripheral drilling insert assembled.
In this embodiment, the blade body 3 is square.
In this embodiment, the locating surface 201 is distinguished from the grindable surface 202 so that the grinding of the grindable surface 202 does not alter the main portion of the locating surface 201 of the insert. The intersection 104 of the wiper edge section 102 and the transition circular edge section 103 determines the machining diameter D of the indexable shallow hole drill. The dressing edge section 102 is moved inward of the insert by grinding the grindable surface 202, thereby moving the intersection 104 of the dressing edge section 102 and the transition circular arc edge section 103, and changing the machining diameter D of the indexable shallow hole drill.
As shown in fig. 1 and 4, the cutting edge 10 is composed of a cutting edge section 101, a smoothing edge section 102, and a transition arc edge section 103. The cutting edge section 101 and the smoothing edge section 102 are straight line sections. The transition arc edge section 103 is an arc line section and mainly connects the smoothing edge section 102 and the cutting edge section 101. The peripheral drilling blade 3 is provided with four smoothing edge sections 102, the adjacent smoothing edge sections 102 are mutually vertical, and the length W of the smoothing edge sections is smaller and is 10-20% of the diameter d of the inscribed circle of the blade. The peripheral drill insert 3 also has four cutting edge sections 101, adjacent cutting edge sections 101 being perpendicular to each other. The cutting edge section 101 and the wiper edge section 102 form an included angle alpha, and the included angle alpha ranges from 3 degrees to 6 degrees.
As shown in fig. 1, 2 and 3, the peripheral drill insert relief surface 20 is composed of an insert locating surface 201, a grindable surface 202, an escape surface 203 and a transition surface 204, and the locating surface 201 is distinguished from the grindable surface 202 such that the main body portion of the insert locating surface 201 is not changed when the grindable surface 202 is ground, and the position of the peripheral drill insert 3 in the drill rod is not changed. The upper edge of the locating surface 201 is a cutting edge section 101, and the locating surface 201 and the bottom surface 50 of the blade form an included angle beta which ranges from 95 degrees to 105 degrees. The locating surface 201 limits the radial and axial position of the blade on the drill rod. The upper edge of the grindable surface 202 is the wiper segment 102, and the grindable surface 202 forms an included angle γ with the insert bottom surface 50, the included angle γ ranging from 95 ° to 105 °, all of which are obtuse angles, so as to obtain a positive peripheral drilling insert.
As shown in fig. 1, the relief edge section 102 may be moved inward of the insert by grinding the grindable surface 202, thereby moving the intersection 104 of the relief edge section 102 and the transition arc edge section 103 and changing the machining diameter D of the indexable shallow hole drill. The avoiding surface 203 is positioned at the lower part of the grindable surface 202, and when the peripheral drilling blade 3 is used by being installed on a drill rod, the peripheral drilling blade 3 can better avoid the machined surface. The transition surface 204 is provided with a transition arc edge section 103 at the upper edge, and the transition surface 204 is connected with the positioning surface 201 and the grindable surface 202.
As shown in fig. 1, the insert upper surface 30 is located inside the four multi-segment cutting edges 10 and is composed of a first upper surface 301, an inclined surface 302, and a second upper surface 303. The first upper surface 301 is connected to the cutting edge 10, and the first upper surface 301 may be a horizontal plane or may form an angle with the horizontal plane. The insert screw hole 40 is composed of a screw hole vertical surface 403, a screw hole arc surface 402 and a screw hole inclined surface 401, and when the peripheral drilling insert 3 is installed in a drill rod, the screw hole arc surface 402 is pressed by the screw head inclined surface, so that the peripheral drilling insert 3 is fixed on the drill rod. The second upper surface 303 is connected to the screw hole inclined surface 401 at the upper side, and the second upper surface 303 is substantially a horizontal surface. The inclined surface 302 connects the first upper surface 301 and the second upper surface 303. The first upper surface 301 and the inclined surface 302 jointly form a chip breaker groove of the blade, and the chips are curled and broken during machining, so that the chips are coiled and broken, and the chips can be discharged out of the drill rod better. The insert bottom surface 50 is located at the bottom of the insert, the insert bottom surface 50 limiting the tangential position of the insert on the drill rod, together with the locating surface 201 in the insert flank limiting the position of the peripheral drilling insert 3 on the drill rod 1.
Referring to fig. 1 to 9, a drilling tool of the present invention comprises a high speed steel drill rod 1, a center drilling insert 2 and the peripheral drilling insert 3; the high-speed steel drill rod 1 is provided with a central cutter groove 12 close to the central axis of the high-speed steel drill rod and a peripheral cutter groove 13 far away from the central axis; the central drilling insert 2 and the peripheral drilling insert 3 are fixed in the central pocket 12 and the peripheral pocket 13, respectively, by means of locking screws 4.
During machining, the center drill insert 2 is responsible for the removal of material in the center area and the removal of cuttings out of the drill rod 1 through the center chip flute 14; the peripheral drilling inserts 3 are responsible for the removal of material in the peripheral zone and discharge the cuttings out of the drill rod 1 through the peripheral flutes 15; the diameter of the machining hole depends on the outermost edge of the peripheral drill blade, i.e. the intersection 104 of the wiper edge section 102 of the peripheral drill blade 3 and the transition circular edge section 103.
After the peripheral drilling blade 3 is installed on the drill rod 1, the blade positioning surface 201 of the rear cutter surface of the peripheral drilling blade 3 is attached to the peripheral cutter groove side positioning surfaces 131 and 132 of the drill rod 1, the radial and axial positions of the peripheral drilling blade 3 in the drill rod 1 are limited, the bottom surface 50 of the peripheral drilling blade is attached to the bottom surface 13 of the peripheral cutter groove of the drill rod, and the tangential position of the peripheral drilling blade 3 in the drill rod 1 is limited.
After the peripheral drilling blade 3 is provided with the cutter bar 1, the dressing edge section 102 of the peripheral drilling blade 3 forms an included angle delta with the central axis 0 of the drill rod, the included angle ranges from 0.5 degrees to 2 degrees, and the length W of the dressing edge section 102 is 10-20 percent of the diameter d of the inscribed circle of the blade. When the length W of the wiper blade is too small or the included angle δ is too large, the wiper blade does not achieve a wiping action, i.e., excellent surface roughness cannot be obtained, and similarly, when the length W of the wiper blade is too large or the included angle δ is too small, the wiper blade easily interferes with the machined surface, thereby affecting the quality of the machined surface. The cutting edge section 101 forms an included angle epsilon with the central axis 0 of the drill rod, the included angle ranges from 3.5 degrees to 8 degrees, and compared with the trimming edge section 102, the cutting edge section 101 has a larger included angle, so that the cutting edge of the peripheral drilling blade and the machined surface have a better avoiding effect.
As shown in fig. 7 to 9, the process of adjusting the machining diameter D of the drill by grinding the peripheral drill insert grindable surface 202 is specifically described below:
when the peripheral drilling blade 3 is not ground, after the peripheral drilling blade 3 is provided with the drill rod 1, a drill diameter D can be realized, and the diameter D is the outermost edge position when the peripheral drilling blade 3 is provided with the drill rod, namely, the intersection point 104 of the finishing edge section 102 and the transition arc edge section 103 of the peripheral drilling blade 3 rotates for a circle around the central axis 0 of the drill rod.
After the peripheral drill insert 3 is ground, the grindable surface 202 is ground, and the grindable surface 202 moves inward to form a grindable surface 202a with a larger area, so that the dressing edge section 102 is moved to form a dressing edge section 102a with a larger length, and the intersection point 104 between the movable dressing edge section 102 and the transition arc edge section 103 is realized to form an intersection point 104 a. At the same time, grinding the grindable surface 202, while reducing the area of the insert locating surface 201, retains a substantial portion of the insert locating surface 201, such as the ground insert locating surface 201a shown in fig. 8, and therefore does not change the position of the peripheral drilling insert 3 in the drill rod 1. As above, by moving the outermost point 104 of the peripheral drilling blade 3 without changing the position of the peripheral drilling blade 3 in the drill rod 1, a reduction of the drill working diameter D is finally achieved, resulting in another drill diameter D1, D > D1.
The grinding amount M for grinding the grindable surface 202 can be set to different values according to market requirements, and the grinding amount M is matched with a corresponding drill body to form a specific size required by a customer. If the diameter D of the drill body is 19mm before the cutting insert is ground, when the grinding amount is set to be 0.05mm, the outermost edge point 104 of the peripheral drilling cutting insert moves inwards by 0.05mm, namely the radius is reduced by 0.05mm, the diameter is reduced by 0.1mm, and the diameter D1 of the finally obtained drill bit is 19-0.1-18.9 mm; when the grind size is set to 0.1mm, the peripheral cutting insert outermost point 104 is moved inward 0.1mm, i.e., the radius is reduced by 0.1mm and the diameter is reduced by 0.2mm, resulting in a drill tool diameter D1 of 19-0.2-18.8 mm. The suitable range of the grinding amount M is as follows: 0.05-0.3 mm.
The peripheral drill blade 3 is adaptable to a variety of drill rod specifications, such as D17mm, D18mm, D19mm, and other various diameter drill rod specifications, as well as to different depth drill rod specifications, such as 2D, 3D, 4D, 5D, and the like. And customizing the non-standard drill bit size to be one drill rod specification. That is, changing the drill diameter D by grinding the peripheral drilling blades 3 has a wider range of applicability than non-standard drill rods.
The smoothing blade section of the peripheral drilling blade and the central axis of the high-speed steel drill rod form an included angle delta, and the included angle delta ranges from 0.5 degrees to 2 degrees; the cutting edge sections of the peripheral drilling blades form an included angle epsilon with the central axis of the high-speed steel drill rod, and the included angle epsilon ranges from 3.5 degrees to 8 degrees.
The structure of the invention utilizes the arranged grindable surface 202 to adjust the processing size of the drilling tool through simple sharpening, thereby leading the drilling tool to have wider application range without influencing the service life and the performance of the tool, and simultaneously leading the sharpened peripheral drilling blade of the hard alloy to have more stable size precision. The invention forms various dimensional tolerance ranges through different sizes before and after sharpening, and has stable service performance and short manufacturing period. In addition, compared with the drill rod with a non-standard size, the structure has wide applicability, namely the blade can be arranged on the drill rods with different specifications, so that the machining sizes of various specifications can be obtained, and the manufacturing period is shorter.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the scope of the disclosed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (7)
1. A peripheral drill insert comprising an insert body having a generally quadrilateral shape; the insert body having an upper surface, a bottom surface, and side surfaces; the upper surface and the side surface are intersected to form four cutting edges corresponding to the quadrangle; each cutting edge comprises a cutting edge section, a smoothing edge section and a transition arc edge section which are sequentially connected, and the transition arc edge section corresponds to the corner position of the blade body; the method is characterized in that: the side surface of the blade body is provided with a blade positioning surface, a grindable surface, an avoiding surface and a transition surface corresponding to each cutting edge, wherein the blade positioning surface, the grindable surface and the transition surface respectively correspond to the cutting edge section, the dressing edge section and the transition arc edge section, and the avoiding surface is arranged at the lower part of the grindable surface; the grinding surface and the blade positioning surface are not coplanar, the intersection point position of the smoothing edge section and the transition arc edge section can be changed by grinding the grinding surface, and the intersection point position is the processing diameter of the drilling tool after the peripheral drilling blade is assembled.
2. The peripheral drill insert of claim 1, wherein: the cutting edge section and the trimming edge section are respectively straight line sections, and the transition arc edge section is an arc line section; the cutting edge section and the trimming edge section form an included angle alpha, and the included angle alpha ranges from 3 degrees to 6 degrees.
3. The peripheral drill insert of claim 2, wherein: adjacent light-trimming edge sections of the four cutting edges are perpendicular to each other; the length of the smoothing edge section is set to be 10% -20% of the diameter of the quadrilateral inscribed circle.
4. The peripheral drill insert of claim 1, wherein: the bottom surface of the blade body is a plane, the blade positioning surface and the bottom surface of the blade form an included angle beta, and the included angle beta ranges from 95 degrees to 105 degrees.
5. The peripheral drill insert of claim 4, wherein: the grindable surface and the bottom surface of the blade body form an included angle gamma which ranges from 95 degrees to 105 degrees.
6. The peripheral drill insert of claim 1, wherein: the middle of the blade body is provided with a screw hole penetrating through the upper surface and the bottom surface of the blade body; a first upper surface, an inclined surface and a second upper surface are sequentially arranged in the upper surface of the insert body from the cutting edge to the screw hole direction; the first upper surface is a plane or an inclined plane, and the second upper surface is a plane; the first upper surface and the inclined surface constitute a chip breaker groove of the blade.
7. A drilling tool comprising a high speed steel drill rod, a center drilling insert and the peripheral drilling insert of any of claims 1 to 6; the high-speed steel drill rod is provided with a central cutter groove close to the central axis of the high-speed steel drill rod and a peripheral cutter groove far away from the central axis; the central drilling blade and the peripheral drilling blade are respectively fixed in the central cutter groove and the peripheral cutter groove through locking screws, and the smoothing blade section of the peripheral drilling blade forms an included angle delta with the central axis of the high-speed steel drill rod, wherein the included angle delta ranges from 0.5 degrees to 2 degrees; the cutting edge sections of the peripheral drilling blades form an included angle epsilon with the central axis of the high-speed steel drill rod, and the included angle epsilon ranges from 3.5 degrees to 8 degrees.
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| CN202010732180.8A CN112045227B (en) | 2020-07-27 | 2020-07-27 | Peripheral drilling blade and drilling tool thereof |
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| CN202010732180.8A CN112045227B (en) | 2020-07-27 | 2020-07-27 | Peripheral drilling blade and drilling tool thereof |
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| WO1992021465A1 (en) * | 1991-05-31 | 1992-12-10 | Sts Komeetstaal Holding B.V. | Cut-off and slotting insert having cutting edges on four symmetrical corners |
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| CN106735487A (en) * | 2016-12-28 | 2017-05-31 | 株洲华锐硬质合金工具有限责任公司 | Position rotatable blade for milling processing and process tool |
| CN109365887A (en) * | 2018-11-26 | 2019-02-22 | 株洲钻石切削刀具股份有限公司 | A kind of milling cutting insert |
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