CN215468320U

CN215468320U - Three-edge drill bit and cutter body with same

Info

Publication number: CN215468320U
Application number: CN202122328050.0U
Authority: CN
Inventors: 余少华
Original assignee: Yueqing Furong Zhongtai Tools Co ltd
Current assignee: Yueqing Furong Zhongtai Tools Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-01-11
Anticipated expiration: 2031-09-24

Abstract

The utility model discloses a three-edge drill bit and a cutter body with the same, wherein the three-edge drill bit comprises: the same, three tool bit that is trident type evenly distributed of size connects through first circular arc between two arbitrary adjacent tool bits, and three tool bit all includes: the cutting edge with locate the cutting front and the cutting back of cutting edge both sides, all cutting edges are connected in the summit, are equipped with the tangent point on arbitrary cutting edge, the tangent point divide into first section sword and second section sword with the cutting edge, first section sword is the part that the tangent point deviates from the summit, the second section sword is the part of tangent point towards the summit, and first section sword is compared in second section sword gently, the cutting front is equipped with interior sword with the cutting back. The three tool bit that is the setting of trident type makes the drilling location more accurate, and the drilling is more round, and makes whole three-edge drill bit more wear-resisting through setting up the different cutting edge of slope degree, and is difficult broken, sets up a plurality of interior sword at last, increases the sweeps ability of discharging, promotes cutting efficiency.

Description

Three-edge drill bit and cutter body with same

Technical Field

The utility model relates to the technical field of hard alloy manufacturing and cutting tools, in particular to a three-edge drill bit and a cutter body with the three-edge drill bit.

Background

The main tools for drilling concrete, bricks and granite in the current market are an electric hammer drill and an electric hammer drill bit which are matched for working. The working principle of the electric hammer drill is that the top hard alloy cutter head completes drilling or cutting operation through the rotation of the electric hammer drill. The electric hammer drill bit mainly used in domestic market is a two-blade bit drill bit and a four-blade bit drill bit. However, the drill bits of the two types of tool bits have great disadvantages, and the hole diameters drilled by the two types of tool bits are not circular enough and are deviated to an ellipse. The four-edge cutter head has low drilling speed and low efficiency.

Therefore, how to provide a drill bit which can make the bore diameter of the drill hole more circular and can be used more efficiently becomes a problem to be solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a three-edge drill bit and a cutter body with the three-edge drill bit, which can ensure that the bore diameter of a drilled hole is more circular, the chip removal effect is better and the drilling efficiency is higher.

To achieve the above object, the present invention provides a three-bladed drill including: three cutter heads which have the same peak and size and are uniformly distributed in a three-fork shape are connected by a first circular arc,

three tool bits all include: the two sides of the first arc are respectively connected with the cutting front and the cutting back of different tool bits, all the cutting edges are connected with the top point, any cutting edge is provided with a tangent point,

the cutting edge is divided into a first section edge and a second section edge by the cutting point, the first section edge is a part of the cutting point deviating from the vertex, the second section edge is a part of the cutting point facing the vertex, and the first section edge is gentler than the second section edge,

the cutting front and the cutting back are provided with inner blades, the inner blades use the tangent points as end points and extend to the corresponding first circular arcs, the adjacent inner blades between the two adjacent cutter heads are intersected, and the intersection points are adjacent to the corresponding first circular arcs.

Optionally, the second segment of edge has a second arc protruding outwards, and the slope between two end points of the second arc is the same as the slope of the original second segment.

Optionally, the ratio range of the width of the cutting front face to the width of the cutting back face is: 1: 1.8-1: 2.2.

optionally, a transition edge is present between the intersection of the inner edge and the first arc.

Optionally, the range of the first arc: R0.2-R3; range of the second arc: R5-R50.

Optionally, the outer surface of the cutter head is provided with a wear resistant coating.

The utility model also provides a cutter body comprising the three-edge drill bit.

With respect to the above background art, the present invention provides a three-bladed drill including: the same, three tool bit that is trident type evenly distributed of size connects through first circular arc between two arbitrary adjacent tool bits, and three tool bit all includes: the cutting edge with locate the cutting front and the cutting back of cutting edge both sides, the cutting front and the cutting back of different tool bits are connected respectively to the both sides of first circular arc, whole cutting edges are connected in the summit, be equipped with the tangential point on arbitrary cutting edge, the tangential point divide into first section sword and second section sword with the cutting edge, first section sword deviates from the part on summit for the tangential point, the second section is the tangential point towards the part on summit, and first section sword is compared in that the second section sword is mild, the cutting front is equipped with the inner blade with the cutting back, the inner blade uses the tangential point to be the summit and extend to the first circular arc that corresponds, adjacent inner blade between two adjacent tool bits is crossing, and the first circular arc that the point of intersect closely adjacent corresponds. The three tool bit that is the setting of trident type makes the drilling location more accurate, and the drilling is more round, and makes whole three-edge drill bit more wear-resisting through the cutting edge that sets up the difference of slope degree, and is difficult broken, sets up a plurality of interior sword at last, increases the chip removal ability, promotes cutting efficiency.

The cutter body with the three-edge drill bit has the beneficial effects that the text is not expanded.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a three-edged drill bit according to an embodiment of the present invention;

FIG. 2 is a side view of a three-edged drill bit according to an embodiment of the present invention;

FIG. 3 is a front view of a three-edged drill bit provided by an embodiment of the present invention;

FIG. 4 is a top view of a three-bladed drill bit according to an embodiment of the present invention;

fig. 5 is a schematic view of a cutter body with a three-bladed drill bit according to an embodiment of the present invention.

Wherein:

1-vertex, 2-tool bit, 3-first arc, 4-cutting edge, 41-first section edge, 42 second section edge, 5-cutting front face, 6-cutting back face, 7-tangent point, 8-inner edge, 9-second arc, 10-transition edge and T-tool body.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.

In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.

The three-edge drill bit provided by the embodiment of the utility model is shown in the attached drawing 1 in the specification, and the attached drawing 1 in the specification is a schematic structural diagram of the three-edge drill bit provided by the embodiment of the utility model, and comprises:

the top 1 and the three cutter heads 2 are uniformly distributed in a three-fork shape, the three cutter heads 2 are the same in size, and included angles among the three cutter heads are the same, so that when the drill bit works, the drilled hole diameter is more circular, and the insertion of deformed steel bars is facilitated; any two adjacent cutter heads 2 are connected through a first arc 3 to form transition, so that the overall structure of the three-edge drill bit is firmer and is not easy to damage;

the three tool bits 2 each include: a cutting edge 4 for being a main cutting edge for drill cutting; referring to fig. 2, fig. 2 is a side view of a three-edged drill according to an exemplary embodiment of the present invention, including: the cutting edge 4 and the center perpendicular line of the three-edge drill bit form a certain included angle a, and the cutting capacity of the three-edge drill bit can be improved within the included angle a in a certain range; a cutting front face 5 and a cutting back face 6 are arranged on two sides of the cutting edge 4, when the three-edge drill bit rotates clockwise, the cutting front face 5 plays a main cutting role, and the cutting back face 6 assists in cutting; the first circular arc 3 connects the cutting front face 5 and the cutting back face 6 belonging to different cutting heads 2, respectively, as an intermediate transition and provides a mounting location for the drill bit on other appliances.

Referring to fig. 3, the specification fig. 3 is a front view of a three-edged drill according to an embodiment of the present invention, including: all the cutting edges 4 are connected to the vertex 1, any cutting edge 4 is provided with a tangent point 7, the tangent point 7 divides the cutting edge 4 into a first section edge 41 far away from the vertex 1 and a second section edge 42 near the vertex 1, the length of the first section edge 41 is larger than that of the second section edge 42 for keeping stability, and the slope of the first section edge 41 is gentler than that of the second section edge 42; namely, a triangular bulge is formed at the vertex 1, the drilling efficiency of the drill is increased by the triangular bulge and the extra blade surface generated by the triangular bulge, and the waste chip discharge capacity in the drilling process is improved.

Referring to fig. 4, the specification fig. 4 is a top view of a three-edged drill according to an embodiment of the present invention, including: the cutting front face 5 and the cutting back face 6 are provided with the inner edges 8, the inner edges 8 are additionally added, so that the connecting structure between the triangular protrusion and the cutter head 2 is smoother, and the design which is more consistent with a dynamic structure provides a three-edge drill with greater cutting capability; the inner edges 8 take the tangent points as end points and extend to the first circular arcs 3 correspondingly clamped with the cutting front face 5 and the cutting back face 6, four inner edges 8 are arranged between two adjacent cutter heads 2, two adjacent inner edges 8 are intersected, the intersection points are adjacent to the corresponding first circular arcs 3, the connection of the inner edges 8 forms an inverted triangle shape when seen from a top view, and the design is more beneficial to discharging waste chips during the working process of the three-edge drill.

The range of the angle a between the cutting edge 4 and the perpendicular line of the center of the three-point drill is set as follows: between 70 degrees and 80 degrees, experiments prove that the three-edge drill bit within the range has stronger cutting capability, more accurate drilling positioning and difficult deviation under the working state.

The distance between the tangent point 7 and the vertex 1 varies with the variation of the cutting head 2, and the variation range is generally: 1 to 10mm, and the design shares the stress of the vertex 1, so that the three-edge drill bit has longer service life.

The surfaces of the blade surfaces of the tool bit 2 on both sides of the first section of blade 41 and the second section of blade 42 are smooth, and in addition, other blade surfaces on the side surfaces of the tool bit 2 have certain roughness, so that the tool bit can be connected with other appliances in a follow-up manner.

Further, as shown in the accompanying fig. 2, the accompanying fig. 2 is a side view of a three-edged drill according to an embodiment of the present invention, including: the second section edge 42 has a second arc 9 which is convex outwards, and the slope between two end points of the second arc 9 is the same as that of the original second section edge and is still larger than that of the first section edge 41; the formed second circular arc 9 is slightly blunted and protruded in a triangular shape, when the drill bit works, the design ensures that the vertex 1 is not easy to break, and the drill bit is more wear-resistant, so that the service life of the three-edge drill bit is prolonged.

Further, the ratio of the width of the cutting front surface 5 to the width of the cutting back surface 6 ranges from: 1: 1.8-1: 2.2, i.e., the width of the cutting back face 6 is approximately equal to twice the width of the cutting front face 5, the design determines that the working effect of the drill bit will be more pronounced when rotated clockwise and provides a better chip evacuation effect.

Furthermore, a transition blade 10 is arranged on a connecting line between the intersection point of the two intersected inner blades 8 and the adjacent first circular arc 3, the cutting capacity of the three-blade bit can be improved by the blades provided by the transition blade 10, and the connection part of the inner blades 8 and the first circular arc 3 is transited to prevent the fracture caused by overlarge rotation stress of the three-blade bit.

Further, the range of the first arc 3 is: R0.2-R3; the range of the second arc 9 is: R5-R50; the experimental result shows that the first arc 3 and the second arc 9 meeting the size range can play a better transition protection role.

The size ranges of the first circular arc 3 and the second circular arc 9 are selected according to the size comparison of the cutter head 2.

Furthermore, the outer surface of the cutter head 2 is provided with a wear-resistant coating, and a wear-resistant titanium carbonitride coating can be selected, so that the service life of the three-edge drill bit is prolonged.

The cutter body T with the three-edged drill bit provided by the utility model is shown in the specification and attached figure 5, the specification and attached figure 5 is a schematic view of the cutter body provided with the three-edged drill bit provided by the embodiment of the utility model, and the specific arrangement mode and the using method of the cutter body T can refer to the prior art and will not be repeated herein.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The three-edged drill and the cutter body having the same according to the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A three-bladed drill bit including an apex, comprising: three cutter heads which have the same size and are uniformly distributed in a three-fork shape, any two adjacent cutter heads are connected through a first circular arc,

three the tool bit all includes: the cutting edge, the cutting front surface and the cutting back surface are arranged on two sides of the cutting edge, two sides of the first arc are respectively connected with the cutting front surface and the cutting back surface of different cutter heads, all the cutting edges are connected with the top point, any one cutting edge is provided with a tangent point,

the tangent point divides the cutting edge into a first section edge and a second section edge, the first section edge is a part of the tangent point deviating from the vertex, the second section edge is a part of the tangent point facing the vertex, and the first section edge is gentler than the second section edge,

the cutting front face and the cutting back face are provided with inner blades, the inner blades take the tangent point as an end point and extend to the corresponding first circular arcs, adjacent inner blades between two adjacent cutter heads are intersected, and the intersection point is adjacent to the corresponding first circular arcs.

2. The three-edged drill according to claim 1 wherein the second edge has an outwardly convex second circular arc, and the slope between the two end points of the second circular arc is the same as the slope of the second edge.

3. A three-edged drill bit as claimed in claim 2, characterized in that the ratio of the width of the cutting front face to the width of the cutting back face ranges from 1: 1.8-1: 2.2.

4. a three-edged drill according to claim 3, wherein a transition edge is present between the intersection point of the inner edges and the first circular arc.

5. Three-edged drill bit as claimed in claim 4,

the range of the first arc: R0.2-R3;

the range of the second arc: R5-R50.

6. A three-edged drill bit as claimed in any of claims 1 to 5, characterized in that the outer surface of the cutter head is provided with a wear-resistant coating.

7. A tool body comprising a three-bladed drill bit according to any of the preceding claims 1 to 6, said three-bladed drill bit being located at the top end of the tool body.