CN210305893U - Drilling chip breaking blade - Google Patents

Abstract

The application provides a drilling chip breaking blade, and relates to the field of metal cutting. This drilling chip breaking blade's shape is protruding trilateral, and drilling chip breaking blade has preceding and six back knife faces, including preceding a plurality of chip breaking pits and a plurality of chip breaking boss of being equipped with, a plurality of chip breaking pits along preceding edge setting, every chip breaking pit intersects with a back knife face to the cutting edge that makes drilling chip breaking blade forms wave form sword, and every chip breaking boss is located one side of keeping away from the cutting edge of the chip breaking pit that corresponds. When the cutting edge cuts and processes a workpiece, generated chips can form a C shape under the guidance of the chip breaking concave pit, then the chips can be contacted with the chip breaking convex table, the chip breaking convex table is favorable for breaking the chips, and independent C-shaped chips are formed after breaking, so that the chips can be removed in the drilling process, and the difficulty in drilling due to accumulation of the chips is avoided.

Description

Drilling chip breaking blade

Technical Field

The application relates to the field of metal cutting, in particular to a drilling chip breaking blade.

Background

At present, the problem of chip breaking in continuous cutting is always a main research object in cutting machining. Great results have also been achieved in research and practice. In recent years, a plurality of large-aperture drilling tools, such as a shallow hole drill (U drill), a drill with a replaceable head and a combined outer edge blade, and the like, emerge, and most of the large-aperture drilling tools can achieve a good chip breaking effect. Particularly, when a deep hole is drilled, the chip breaking effect is good, chips can be smoothly removed from the hole, and the chip breaking effect is an important condition for ensuring normal machining.

In practice, the chips formed are often not ideal as a result of changes in the material of the workpiece, or the fact that no renewed chip-breaking groove shape is available. With the conventional "V" chip breaker groove, the chips often cannot be formed into single independent C-shaped chips, but are continuous C-shaped chips which are broken into chips with the length of 5-10cm during the chip removal process. This causes certain difficulties for chip removal during drilling.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a drilling chip-breaking blade to improve the problem that the existing drilling chip-breaking blade cannot form independent C-shaped chips.

The embodiment of the application provides a drilling chip breaking blade, the shape of drilling chip breaking blade is protruding trilateral, drilling chip breaking blade has preceding and six back knife face, be equipped with a plurality of chip breaking pits and a plurality of chip breaking boss including preceding, a plurality of chip breaking pits along preceding edge setting, every chip breaking pit intersects with a back knife face to the cutting edge that makes drilling chip breaking blade forms into wave form sword, and every chip breaking boss is located one side of keeping away from the cutting edge of the chip breaking pit that corresponds.

Among the above-mentioned technical scheme, every chip breaking pit intersects with a back knife face for the cutting edge of drilling chip breaking blade forms into the wave form sword, and when the cutting edge cutting process work piece, the smear metal of production can form C shape under the guide of chip breaking pit, and the smear metal can contact with the chip breaking boss afterwards, and the chip breaking boss helps the smear metal to break, forms independent C shape bits after the rupture, helps the chip removal of drilling in-process, avoids piling up because the smear metal and causes the difficulty for drilling.

In addition, the drilling chip-breaking blade of the embodiment of the application also has the following additional technical characteristics:

in some embodiments of the present application, a bottom surface of each chip-breaking dimple is a curved surface, the curved surface including a predetermined curve and two portions symmetrical with respect to the predetermined curve; the preset curve comprises a straight line section and an arc line section, the straight line section is perpendicular to the cutting edge, one end of the straight line section is located on one rear cutter face, one end of the arc line section is located in front of the cutting edge, and the arc line section is tangent to the straight line section.

In the technical scheme, each chip breaking pit is provided with two symmetrical parts about a curve comprising a straight line section and an arc section, the straight line section is tangent to the arc section, and each chip breaking pit is formed by sequentially sweeping or arranging a plurality of smooth and constantly changing curves along the straight line section and the arc section side by side, and the intersection line of the formed chip breaking pit and the front surface must meet the circular arc with a set diameter. The curved surface part formed along the straight line segment can provide a moving path for the chip, and the curved surface part formed along the arc line segment can change the moving path of the chip to enable the chip to form a C shape.

In some embodiments of the present application, the distance between one end of the straight line segment located on the flank face and the cutting edge is 0.15mm-03mm, and the included angle between the straight line segment and the front face is 2-3 degrees.

In the technical scheme, the distance between one end of the straight line section positioned on the rear cutter surface and the cutting edge is 0.15-0.3 mm, and the cutting edge of the bottom surface of the pit at the intersection of the chip breaking pit and the rear cutter surface is lower than the cutting edge on the front surface to form a waveform edge; the included angle between the straight line segment and the front face is 2-3 degrees, so that the front angle in the chip breaking pit is not 0 degree, the drilling force cannot be increased in the drilling process, and good fine C-shaped chips can be obtained under the condition that the drilling force is not increased.

In some embodiments of the present application, the distance between the tangent point of the straight segment and the arc segment from the front face is 0.2mm to 0.3 mm.

Among the above-mentioned technical scheme, the distance that the tangent point distance of straightway and arc segment was preceding is 0.2mm-0.3mm, and the distance that the tangent point distance of injecing straightway and arc segment was preceding makes the degree of depth of chip breaking pit at reasonable scope, and C shape bits that can be tiny are difficult for piling up, make things convenient for the chip removal.

In some embodiments of the present application, the radius of the arc segment is 0.8mm to 1 mm.

In the technical scheme, the radius of the arc line section is 0.8mm-1mm, so that high-quality C-shaped chips can be formed in the chip breaking pits.

In some embodiments of the present application, each chip breaking pocket intersects the relief surface to form an arcuate indentation, the arcuate indentation having a width on the front face of 0.7mm to 1.2 mm; the intersection line of the curved surface and the front surface is an arc, and the diameter of the arc is 1mm-1.5 mm.

In the technical scheme, the width of the arc-shaped notch is limited, namely the width of the concave part cutting part of the wavy edge is limited, so that the size of chips is more reasonable, and chip removal is facilitated; and the arc formed by the intersection line of the curved surface and the front surface is limited, so that the size of the chip pit can be limited, all the chip pits cannot be too large or too small on the front surface, and the chip pits can be reasonably arranged.

In some embodiments of the present application, the surface of each chip breaking land is spherical.

Among the above-mentioned technical scheme, the surface of chip-breaking boss is the sphere, can reduce the frictional force of smear metal and chip-breaking boss contact, has reduced the drilling power promptly, also conveniently forms independent C shape bits.

In some embodiments of the present application, the spherical surface intersects the anterior face to form a circle having a diameter of 0.5mm to 1 mm.

In the technical scheme, the spherical surface and the front surface are limited to intersect to form a circle with the diameter of 0.5-1 mm, so that the chip breaking boss has a reasonable size, and chips can be better promoted to form C-shaped chips.

In some embodiments of the present application, the intersection of the spherical surface and the front surface forms a circle center at a distance of 1.35mm to 2.3mm from one end of the flank surface from the straight line segment.

Among the above-mentioned technical scheme, the centre of a circle that intersects the formation with preceding and the distance of straightway between the one end that is located the back knife face are injectd within reasonable scope for reasonable distance has between chip breaking pit and the chip breaking boss, can not appear because of the too big problem that can't form C shape bits of distance between the two.

In some embodiments of the present application, a line connecting a center on the leading face of each chip breaking dimple with a center of a circle where the corresponding chip breaking land intersects the leading face is perpendicular to the cutting edge.

In the technical scheme, the connecting line of the center of each chip breaking pit on the front face and the center of the circular intersecting line of the corresponding chip breaking boss and the front face is perpendicular to the cutting edge, so that chips, the chip breaking pits and the chip breaking bosses are better matched to form a C shape in the cutting process.

In some embodiments of the present application, the protrusion height of each chip breaking land on the front face is 0.2mm to 0.3 mm.

In the technical scheme, the protruding height of the chip breaking boss on the front surface is limited, so that the structural design of the drilling chip breaking blade is reasonable, and the function of the chip breaking boss can be played.

In some embodiments of the present application, the drill chip breaker insert is provided with a wiper edge.

In the technical scheme, the smoothing edge is added on the drilling chip breaking blade, so that the processed surface is higher in smoothness and more stable in processing.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic structural diagram illustrating a first perspective view of a drill chip breaker insert provided in accordance with an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a second perspective view of a drill chip breaker insert provided in accordance with an embodiment of the present application;

FIG. 3 is a parameter labeling diagram of FIG. 2;

FIG. 4 is a schematic view of a chip-breaking dimple and a corresponding chip-breaking land of FIG. 2;

FIG. 5 is a cross-sectional view of V-V in FIG. 4;

FIG. 6 is a parameter labeling diagram of FIG. 5;

fig. 7 is a schematic forming view of a first tool flank of the first finishing provided in the embodiment of the present application;

FIG. 8 is a schematic view of a drill chip breaker insert provided herein cutting a first machined workpiece;

FIG. 9 is a schematic view of a drill chip breaker insert provided herein cutting a second machined workpiece.

Icon: 100-drill chip breaking blade; 10-front; 11-chip breaking pits; 111-a preset curve; 1111-straight line segment; 1112-arc segments; 12-chip breaking boss; 20-a first relief surface; 21-a second relief surface; 22-a third relief surface; 23-a fourth relief surface; 24-a fifth relief surface; 25-a sixth relief surface; 30-a first cutting edge; 31-a second cutting edge; 32-a third cutting edge; 33-a fourth cutting edge; 34-a fifth cutting edge; 35-a sixth cutting edge; 40-a first corner; 41-second rake angle; 42-third rake angle; 50-a first lobe; 51-a second lobe; 52-third lobe; 60-a first wiper edge; 61-a second wiper edge; 62-a third wiper edge; 70-a first arc-shaped knife finishing rear face; 200-processing the workpiece.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present application, it should be noted that the indication of orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship which is usually placed when the product of the application is used, or the orientation or positional relationship which is usually understood by those skilled in the art, or the orientation or positional relationship which is usually placed when the product of the application is used, and is only for the convenience of describing the application and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Examples

As shown in fig. 1 and 2, the present embodiment provides a drill chip breaking insert 100, the shape of the drill chip breaking insert 100 is a convex triangle, the drill chip breaking insert 100 has a front face 10 and six flank faces, the front face 10 is provided with a plurality of chip breaking recesses 11 and a plurality of chip breaking bosses 12, the plurality of chip breaking recesses 11 are arranged along the edge of the front face 10, each chip breaking recess 11 intersects with one flank face, so that the cutting edge of the drill chip breaking insert 100 is formed into a wave-shaped edge, and each chip breaking boss 12 is located on one side of the corresponding chip breaking recess 11 away from the cutting edge. Each chip breaking pit 11 is intersected with a back tool face, so that the cutting edge of the drilling chip breaking blade 100 is formed into a wave-shaped edge, when the cutting edge cuts and processes a workpiece, generated chips can form a C shape under the guidance of the chip breaking pits 11, then the chips can be contacted with the chip breaking bosses 12, the chip breaking bosses 12 are beneficial to breaking the chips, and independent C-shaped chips are formed after breaking, so that the chips can be discharged in the drilling process, and the difficulty caused by the accumulation of the chips in the drilling chip breaking blade 100 during drilling is avoided.

In the present embodiment, the drilling chip-breaker insert 100 is a convex triangular insert, the drilling chip-breaker insert 100 has a front face 10 and six flank faces, the front face 10 is provided with a plurality of chip-breaker recesses 11 and chip-breaker projections 12, all the chip-breaker recesses 11 are arranged along the edge of the front face 10, and each chip-breaker projection 12 is located on one side of the corresponding chip-breaker recess 11 away from the cutting edge. Defining six flank surfaces as a first flank surface 20, a second flank surface 21, a third flank surface 22, a fourth flank surface 23, a fifth flank surface 24 and a sixth flank surface 25, respectively, each chip breaking pocket 11 intersects with one flank surface so that the cutting edge of the drill chip breaker insert 100 is formed as a wave edge, i.e. the first flank surface 20 intersects with the front face 10 to form a first cutting edge 30, the second flank surface 21 intersects with the front face 10 to form a second cutting edge 31, the third flank surface 22 intersects with the front face 10 to form a third cutting edge 32, the fourth flank surface 23 intersects with the front face 10 to form a fourth cutting edge 33, the fifth flank surface 24 intersects with the front face 10 to form a fifth cutting edge 34, and the sixth flank surface 25 intersects with the front face 10 to form a sixth cutting edge 35, because each flank surface intersects with the front face 10 at the chip breaking pocket 11, i.e. the formed cutting edges are all wave edges. Each flank face is formed to extend obliquely downward by 8 ° from the cutting edge.

As shown in fig. 2 and 3, the drill chip breaker insert 100 has a first rake angle 40, a second rake angle 41, and a third rake angle 42, the second flank surface 21 and the third flank surface 22 form the first rake angle 40, the fourth flank surface 23 and the fifth flank surface 24 form the second rake angle 41, and the sixth flank surface 25 and the first flank surface 20 form the third rake angle 42. The angles of the first knife angle 40, the second knife angle 41 and the third knife angle 42 are all 84 degrees; the drill chip breaker insert 100 has a first lobe 50, a second lobe 51 and a third lobe 52, a first flank 20 forms the first lobe 50 with a second flank 21, a third flank 22 forms the second lobe 51 with a fourth flank 23, a fifth flank 24 forms the third lobe 52 with a sixth flank 25, the first, second and third lobes 50, 51 and 52 are all at an angle of 156 °. Each cutting edge circumscribes the same circle, the inscribed circle having a diameter N of 8-20 mm. In the present embodiment, the first corner 40, the second corner 41 and the third corner 42 are all arc corners, and the specific forming manner and the dimensional parameters are described in detail later.

Further, as shown in fig. 1, 4 and 5, the bottom surface of each chip-breaking pit 11 is a curved surface, and the curved surface includes a preset curve 111 and two portions symmetrical with respect to the preset curve 111; the predetermined curve 111 includes a straight line section 1111 and an arc section 1112, the straight line section 1111 is perpendicular to the cutting edge, one end of the straight line section 1111 is located on a flank surface, one end of the arc section 1112 is located on the front surface 10, and the arc section 1112 is tangent to the straight line section 1111. It will be appreciated that each chip-breaking pocket 11 is formed by a plurality of smooth and constantly changing curves sweeping sequentially or side-by-side along straight sections 1111 and curved sections 1112, and the intersection of the formed chip-breaking pocket 11 and the front face 10 must satisfy a circular arc having a diameter of 1mm to 1.5 mm. The curved surface formed along the straight line segment 1111 can provide a moving path for the chip, and the curved surface formed along the arc segment 1112 can change the moving path of the chip to form the chip into a C shape. The curved surface includes two portions symmetrical with respect to the preset curve 111, which means that the curved surface is located at both left and right sides of the preset curve 111 as shown in fig. 4.

Optionally, with continued reference to fig. 4, each chip breaking dimple 11 intersects the flank face to form an arc-shaped gap, the width of which on the front face 10 is 0.7mm-1.2 mm; the intersection line of the curved surface and the front surface 10 is an arc, and the diameter of the arc is 1mm-1.5 mm. The width of the arc-shaped notch is limited, namely the width of the concave part cutting part of the wave-shaped blade is limited, so that the size of chips is more reasonable, and chip removal is facilitated; and the arc formed by the intersection line of the curved surface and the front surface 10 is limited, so that the size of the chip pit can be limited, all the chip pits cannot be too large or too small on the front surface 10, and the chip pits can be reasonably arranged.

The width of the arc notch on the front face 10 is defined as a, the diameter of the arc formed by the intersection of the curved face and the front face 10 is defined as k1, namely the value range of a is 0.7mm-1.2mm, and the value range of k1 is 1mm-1.5 mm.

Alternatively, as shown in fig. 6, the distance between one end of the straight line 1111 located on the flank surface and the cutting edge is 0.15mm-03mm, and the included angle between the straight line 1111 and the front surface 10 is 2-3 °. The distance between one end of the straight line section 1111, which is positioned on the rear cutter face, and the cutting edge is 0.15mm-03mm, and the cutting edge of the bottom surface of the chip-breaking pit 11, which is at the intersection of the rear cutter face, is lower than the cutting edge on the front face 10 to form a wave-shaped edge; the included angle between the straight line section 1111 and the front face 10 is 2-3 degrees, so that the front angle in the chip-breaking pit 11 is not 0 degree, the drilling force cannot be increased in the drilling process, and good fine C-shaped chips can be obtained under the condition that the drilling force is not increased.

Generally, in the field of metal cutting, the rake face is defined as the surface of the insert along which chips flow; the rear cutter face is the surface of the blade opposite to the transition surface on the workpiece; the base surface is a plane which passes through a certain designated point on the cutting edge and is vertical to the cutting speed direction of the point; the cutting plane is a plane which passes through a specified point on the cutting edge, is tangent to the cutting edge and is vertical to the base surface of the point; the orthogonal plane is a plane passing through a certain designated point on the main cutting edge and is perpendicular to a base plane of the point and the cutting plane, the rake angle is an included angle between the rake face and the base plane measured in the orthogonal plane, and the rake angle is a positive value when the rake face is below the base plane and is a negative value in the opposite direction; the relief angle is the angle between the main relief surface and the cutting plane measured in the orthogonal plane; the angle of inclination of the main cutting edge is measured in the base plane and is the angle between the projection of the main cutting edge on the base plane and the direction of the feed movement. In this embodiment, the front face 10 coincides with the base face.

The distance between one end of the straight line section 1111, which is positioned on the rear tool face, and the cutting edge is defined as e1, the included angle between the straight line section 1111 and the front face 10 is defined as gamma, namely the value range of e1 is 0.15mm-03mm, and the value range of gamma is 2-3 degrees.

Further, with reference to fig. 5 and 6, the tangent point of the straight line 1111 and the arc 1112 is 0.2mm to 0.3mm from the front 10. The distance between the tangent point of the straight line section 1111 and the arc section 1112 and the front 10 is limited, so that the depth of the chip-breaking pit 11 is in a reasonable range, small C-shaped chips can be formed, the chips are not easy to stack, and the chips can be conveniently removed.

Further, the radius of arc segment 1112 is 0.8mm-1 mm. So that the chips can form high-quality C-shaped chips in the chip-breaking recesses 11.

The distance between the tangent point of the straight line segment 1111 and the arc segment 1112 and the front 10 is defined as e2, the radius of the arc segment is defined as r, namely the value range of e2 is 0.2mm-0.3mm, and the value range of r is 0.8mm-1 mm.

Further, with continued reference to FIG. 4, the surface of each chip breaking land 12 is spherical. The spherical surface is arranged to reduce the friction force between the chips and the chip breaking boss 12, so that independent C-shaped chips are conveniently formed.

Optionally, the spherical surface intersects the front face 10 to form a circle having a diameter of 0.5mm to 1 mm. The spherical surface is limited to intersect with the front face 10 to form a circle with the diameter of 0.5mm-1mm, so that the chip breaking boss 12 has a reasonable size and can better promote chips to form C-shaped chips.

In the present embodiment, the diameter of the circle defining the diameter formed by the intersection of the spherical surface and the front surface 10 is k2, i.e. k2 has a value in the range of 0.5mm to 1 mm. In other embodiments, the surface of the chipbreaker boss 12 may be rectangular or other curved surface.

In some embodiments of the present application, the protrusion height of each chip breaking land 12 on the front face 10 is 0.2mm to 0.3 mm. The raised height of the chip breaker boss 12 on the front face 10 is limited to allow the structural design of the drill chip breaker insert 100 to be rational and to function as a chip breaker boss 12.

In the embodiment, the distance from the center of the straight line 1111 formed by the intersection of the spherical surface and the front surface 10 to one end of the flank surface is 1.35mm-2.3 mm. The distance between the circle center formed by the intersection of the spherical surface and the front surface 10 and one end of the straight line section 1111 located on the rear cutter surface is limited within a reasonable range, so that a reasonable distance is reserved between the chip breaking concave pit 11 and the chip breaking convex table 12, and the problem that C-shaped chips cannot be formed due to the fact that the distance between the chip breaking concave pit 11 and the chip breaking convex table is too large is solved.

A distance W between a circle center formed by the intersection of the spherical surface and the front surface 10 and a circle center distance straight line 1111 located at one end of the rear cutter surface is defined, the protruding height of each chip breaking boss 12 on the front surface 10 is f, namely the value range of W is 1.35mm-2.3mm, and the value range of f is 0.2mm-0.3 mm.

Further, a line connecting the center of each chip breaking dimple 11 on the front face 10 and the center of the circle where the corresponding chip breaking land 12 intersects the front face 10 is perpendicular to the cutting edge. The line connecting the center of each chip-breaking pocket 11 on the front face 10 with the center of the intersection of the corresponding chip-breaking land 12 with the circle on the front face 10 is perpendicular to the cutting edge, so that chips better fit with the chip-breaking pockets 11 and the chip-breaking lands 12 to form a C-shape during cutting. In other embodiments, the line connecting the center of each chip-breaking pocket 11 on the front face 10 and the center of the circle where the corresponding chip-breaking land 12 intersects the front face 10 may be arranged at other angles to the cutting edge, as long as the chip-breaking land 12 can contact the chip and change the moving path of the chip.

Further, the drill chip breaker 100 is provided with a wiper edge. The addition of the smoothing edge on the drill chip-breaking blade 100 enables the machined surface to have higher smoothness and more stable machining.

In the present embodiment, the wiper edge has a first wiper edge 60, a second wiper edge 61, and a third wiper edge 62. As shown in fig. 2 and 3, a line segment which is a distance b2 from the center line a of the inscribed circle and is parallel to a intersects the convex trilateral to form a first wiper edge 60, and a second wiper edge 61 and a third wiper edge 62 are formed in a 120 ° rotational distribution at the center of the inscribed circle. B1 in the figure is the distance from the intersection of the second cutting edge 31 and the third cutting edge 32 to the first wiper edge 60, wherein b is b1+ b2, and b2 is about 16 times that of b 1.

In addition, as shown in fig. 7, the first wiper edge 60 rotates upward with R as a radius and O as a center to form a first arc wiper relief flank 70, the radius R is 1.2 times of b2, the center of the O point is located above the front face 10 and is at a distance h of 3mm from the front face 10, the first wiper edge 60 respectively intersects with the second cutting edge 31 and tangentially transitions with a radius of 0.1-0.3mm to form a first arc point corresponding to the first rake angle 40, the first arc point extends downward with a relief angle of α ° and intersects with the first arc wiper relief flank 70 and the second relief flank 21, and the second arc wiper relief flank (not shown) and the third arc wiper relief flank (not shown) can be formed by referring to the arc forming mode of the first wiper flank 70.

As shown in fig. 8, when the workpiece 200 is hard and easily broken, chips collide with the chip breaker projections 12, and then the chips are crushed by the pressing in the chip breaker pockets 11 and the further bending of the chip breaker projections 12 and broken into C-shaped chips. When the machined workpiece 200 is soft and not easy to break, the chips meet the chip breaking boss 12 and then continue to bend until the chips meet the surface of the unprocessed workpiece 200, and the chips are forced to tear and break to form C-shaped chips under the reaction of the surface of the unprocessed workpiece 200, as shown in FIG. 9.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (12)

1. The utility model provides a drilling chip-breaking blade, drilling chip-breaking blade's shape is protruding trilateral, drilling chip-breaking blade has preceding and six back knife face, its characterized in that includes:

be equipped with a plurality of chip-breaking pits and a plurality of chip-breaking boss in the front, a plurality of chip-breaking pits are followed preceding edge setting, and every chip-breaking pit intersects with a back knife face, so that drilling chip-breaking blade's cutting edge forms into the wave form sword, and every chip-breaking boss is located keeping away from of corresponding chip-breaking pit one side of cutting edge.

2. A drill chip-breaker insert according to claim 1, wherein the bottom surface of each chip-breaker pocket is a curved surface comprising a predetermined curve and two portions symmetrical about the predetermined curve;

the preset curve comprises a straight line segment and an arc line segment, the straight line segment is perpendicular to the cutting edge, one end of the straight line segment is located on a rear cutter face, one end of the arc line segment is located on the front face, and the arc line segment is tangent to the straight line segment.

3. The drill chip breaker insert as claimed in claim 2 wherein the distance between the end of said straight line segment on the flank face and said cutting edge is 0.15mm-0.3mm and the angle between said straight line segment and said front face is 2 ° -3 °.

4. A drill chip breaker insert according to claim 3 wherein the tangent point of the straight and curved line segments is at a distance of 0.2mm-0.3mm from the front face.

5. A drill chip-breaker insert according to claim 4, wherein the radius of the arc segment is 0.8-1 mm.

6. The drill chip breaker insert of claim 5 wherein each chip breaking pocket intersects a flank face to form an arcuate indentation having a width of 0.7mm to 1.2mm on the front face; the intersection line of the curved surface and the front surface is an arc, and the diameter of the arc is 1mm-1.5 mm.

7. A drill chip-breaker insert according to any one of claims 2-6, characterized in that the surface of each chip-breaker boss is spherical.

8. A drill chip-breaker insert according to claim 7, wherein said spherical surface intersects said front face to form a circle having a diameter of 0.5mm-1 mm.

9. The drill chip breaker insert of claim 8 wherein the spherical surface intersects said front face at a center point located 1.35mm to 2.3mm from an end of said straight line segment on said flank face.

10. A drill chip breaker insert according to claim 9 wherein the line joining the centre of each chip-breaking pocket on the front face to the centre of the circle intersecting the corresponding chip-breaking land and the front face is perpendicular to the cutting edge.

11. A drill chip-breaker insert according to claim 7, wherein the protruding height of each chip-breaker boss on the front face is 0.2-0.3 mm.

12. A drill chip-breaker insert according to claim 1, characterized in that it is provided with a wiper edge.

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