CN219966532U - Drill bit with asymmetric ligament and circular arc chip flute - Google Patents

Abstract

The drill bit with the asymmetrical ligaments and the circular arc chip flutes comprises a drill bit body, wherein the drill bit body comprises a drill handle, a drill body and a drill tip, a drill flute part is arranged on one side of the drill body in an extending mode, two main ligaments which are arranged asymmetrically are arranged on the drill flute part, two main chip flutes are arranged on one side edges of the two main ligaments towards the drill body, and two circular arc chip flutes are arranged on the drill tip and are connected with the main chip flutes in a smooth mode; the other side of the main ligament is provided with two auxiliary chip grooves towards the drill body, and one auxiliary chip groove is internally provided with an auxiliary ligament which surrounds one circle of the chip groove. The asymmetrical design of the drill bit ligament breaks through the traditional symmetrical support design, and changes the stress balance of the physical support into the stress balance of the air-isolation support, thereby realizing high rotation speed, and changing the adverse phenomena of mutual extrusion, obvious temperature rise, severe friction and the like of the former symmetrical support ligament under high speed.

Description

Drill bit with asymmetric ligament and circular arc chip flute

Technical Field

The utility model relates to a drill bit, in particular to a drill bit with an asymmetric ligament and an arc chip flute.

Background

Most of the drill bits in the current market adopt symmetrical ligament design, and have the advantages that: the manufacturing is simple, the grinding is easy, the rigidity of the drill bit is good, and the defect is that: because the supporting ligaments are symmetrically designed at 180 degrees, the radial forces born by the two symmetrical supporting ligaments are on the same straight line in the processing process, the forces are theoretically equal, the stress directions are opposite, so that the stress reaches balance, and the drill can be stably supported in the processing process because of the stress balance. However, during the machining process, the drill rotates around the central axis of the cutter at a high speed, the two supporting ligaments of the drill play a role in supporting each other in the machined hole, and due to the high-speed rotation, the supporting ligaments are subjected to high friction force, high heat is generated due to high-speed friction, and the two symmetrical supporting ligaments generate high temperature along with the machining. Because the drill bit is always continuously processed, the supporting ligaments are stressed and allowed to be retracted mutually, but the supporting ligaments are symmetrically distributed, so that no practical retraction space exists, the drill bit is always in a high-speed friction state with the hole wall, the generated heat can rapidly soften the ligaments, the hardness is reduced, and the ligaments can rapidly wear. When the ligament wears out rapidly, the supporting performance of the drill bit will drop rapidly, and the life of the drill bit will be shortened.

Disclosure of Invention

Aiming at the technical problems, the drill bit with the asymmetric ligaments and the circular arc chip flutes provided by the utility model solves the problems of rapid heating, rapid ligament softening, reduced hardness of the drill bit and the like when the drill bit rubs with the hole wall in the prior art.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the drill bit with the asymmetrical ligaments and the circular arc chip flutes comprises a drill bit body, wherein the drill bit body comprises a drill shank, a drill body and a drill tip, a drill flute part is arranged on one side of the drill body in an extending mode, two main ligaments which are arranged asymmetrically are arranged on the drill flute part, two main chip flutes are arranged on one side of the two main ligaments towards the drill body, and the main ligaments and the main chip flutes are spirally distributed along the central axis of the drill bit body; the drill point is provided with two chip flutes, the two main ligaments form a chisel edge at the center of the front end face of the drill point, and the chip flutes are positioned at two sides of the chisel edge and are in smooth connection with the main chip grooves;

two auxiliary chip grooves are formed in the other side edges of the two main ligaments towards the drill body, the auxiliary chip grooves are distributed in a spiral mode along the central axis of the drill body, and auxiliary ligaments surrounding the chip grooves are arranged in one auxiliary chip groove.

As a further preferred aspect of the present utility model, the included angle between the two ligaments is 187 °, and the difference between the included angles is between-2 ° and 2 °.

As a further preferred aspect of the present utility model, the secondary junk slot is formed with two junk channels through the secondary ligament.

As a further preferred aspect of the present utility model, the collateral ligament is provided at a position intermediate the collateral chip grooves, and the two chip removing passages are identical in size.

As a further preferred aspect of the present utility model, the main junk slot forms an end edge at the drill tip, the end edge forming two circular arc tooth gaps at the drill tip; the two end edges are asymmetrically arranged.

As a further preferred aspect of the present utility model, the two chip flutes are circular arc-shaped and asymmetrically arranged.

The technical scheme has the following advantages or beneficial effects:

the asymmetrical design of the drill bit ligament breaks through the traditional symmetrical support design, and changes the stress balance of the physical support into the stress balance of the air-isolation support, thereby realizing high rotation speed, and changing the adverse phenomena of mutual extrusion, obvious temperature rise, severe friction and the like of the former symmetrical support ligament under high speed. The drill bit is balanced in stress in the high-speed processing process, but the opposite sides of the ligament are empty, the drill bit can obtain small-range yielding, the problem that the ligament cannot yield in a small range when the bore wall is rubbed at high speed is effectively avoided, the linear speed can be continuously increased on the basis of the conventional linear speed, the ligament abrasion is not increased, the efficiency is improved, and the service life of a cutter is also prolonged. The arc chip flute changes the prior chip breaking to be realized by the interaction between the processed hole wall and the bit cutter body, and the chip breaking process is independently finished in the bit cutter body directly, so that the adverse effect of the acting force and the reacting force between the workpiece and the bit is avoided.

Drawings

The utility model and its features, aspects and advantages will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings. Like numbers refer to like parts throughout. The drawings are not intended to be drawn to scale, emphasis instead being placed upon illustrating the principles of the utility model.

FIG. 1 is a schematic view of a drill bit with asymmetrical ligaments and circular arc flutes according to the present utility model;

FIG. 2 is a schematic diagram of a drill bit with asymmetrical ligaments and circular arc flutes according to the present utility model;

FIG. 3 is a side view of a drill bit of the present utility model having asymmetrical ligaments and circular arc flutes;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;

in the figure, 1, a drill handle, 2, a drill body, 3, a drill point, 4, a main ligament, 5, an end edge, 6, a chip flute, 7, a main chip flute, 8, an auxiliary chip flute, 9, an arc tooth gap, 10, an auxiliary ligament, 11 and a chisel edge.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or groups thereof.

The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

The terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, as if they were fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following description of the technical solutions according to the embodiments of the present utility model refers to the accompanying drawings, which are included to illustrate only some embodiments of the utility model, and not all embodiments. Accordingly, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to fall within the scope of the present utility model.

Examples:

as shown in fig. 1-3, the drill bit with the asymmetrical ligaments and the circular arc chip flutes provided by the utility model comprises a drill bit body, wherein the drill bit body comprises a drill shank 1, a drill body 2 and a drill tip 3, a drill flute part is arranged on one side of the drill body 2 in an extending way, the drill flute part is provided with two main ligaments 4 which are arranged asymmetrically, one side of each main ligament 4 is provided with two main chip flutes 7 towards the drill body 2, and the main ligaments and the main chip flutes 7 of each main ligament 4 are spirally distributed along the central axis of the drill bit body. The drill tip 3 is provided with two chip flutes 6, the two main ligaments 4 form a chisel edge 11 at the center of the front end face of the drill tip 3, and the chip flutes 6 are positioned on two sides of the chisel edge 11 and are connected with the main chip flutes 7 in a smooth manner. The other side of the two main ligaments 4 is provided with two auxiliary chip grooves 8 towards the drill body 2, the auxiliary chip grooves 8 are spirally distributed along the central axis of the drill body, and one auxiliary chip groove 8 is internally provided with an auxiliary ligament 10 which surrounds one circle of the chip grooves.

Further illustratively, the drill bit design employs two main junk slots 7 that are not 180 ° symmetrical, while employing a three ligament-supported structural design. As shown in fig. 4, the two main ligaments 4 are not in the same straight line, the included angle between the two main ligaments 4 is 187 degrees, the difference of the included angles is between-2 degrees and 2 degrees, the auxiliary ligaments 10 are additionally used as additional stress supporting ligaments, the three ligaments are in balance after being decomposed in the x and y coordinate axes in the high-speed processing process, and the opposite side direction of each ligament is free of the ligament, so that the drill bit can obtain small-range yielding, the problem that the ligaments cannot yield in a small range due to high-speed friction of the hole wall is effectively avoided, the linear speed can be continuously improved on the basis of the conventional linear speed, the abrasion of the ligaments is not increased, the efficiency is improved, and the service life of a cutter is also improved.

Further, the chip flute 6 is in a circular arc shape and asymmetrically arranged, and the chip flute 6 is in smooth connection with the main chip flute 7. The arc chip flute changes the prior chip breaking to be realized by the interaction between the processed hole wall and the bit cutter body, and the chip breaking process is independently finished in the bit cutter body directly, so that the adverse effect of the acting force and the reacting force between the workpiece and the bit is avoided. The chip generated when the drill bit spirally cuts a processed material extends along the arc-shaped chip flute wall surface in the discharging process, under the compression of the side surface, the chip can continuously extend forwards along the arc shape and extend to a certain length to reach the curled chip breaking radius of the chip, so that the chip breaking phenomenon occurs, long chips become short curled chips due to chip breaking and bending, the short curled chips are easily discharged from the chip flute under the rotating action of the drill bit, and the long chips are prevented from pushing the hole wall to cause the jump of the drill bit and affecting the service life of the drill bit.

Further, the secondary flutes 8 are formed with two flutes through the secondary ligament 10, and the secondary ligament 10 is disposed in the central position of the secondary flutes 8 in this embodiment, so that the two flutes are of uniform size, and short curled chips are conveniently discharged from the flutes. The main junk slot 7 forms an end edge 5 at the drill tip 3, the end edge 5 forms two circular arc tooth gaps 9 at the drill tip 3, as shown in fig. 4, the end edge 5 is asymmetrically arranged, the included angle between the two end edges 5 is 187 degrees, and the difference of the included angles is between-2 degrees and 2 degrees. The region between the end edge 5 and the chisel edge 11 is a secondary junk slot 8, and the other two regions are primary junk slots 7.

In summary, the drill bit with the asymmetric ligaments and the circular arc chip flutes provided by the utility model adopts the asymmetric design, breaks through the traditional symmetric support design, and changes the stress balance of the physical support into the stress balance of the space support, thereby realizing high rotation speed, and changing the adverse phenomena of mutual extrusion, obvious temperature rise, severe friction and the like of the prior symmetric support ligaments at high speed. The drill bit is balanced in stress in the high-speed processing process, but the opposite sides of the ligament are empty, the drill bit can obtain small-range yielding, the problem that the ligament cannot yield in a small range when the bore wall is rubbed at high speed is effectively avoided, the linear speed can be continuously increased on the basis of the conventional linear speed, the ligament abrasion is not increased, the efficiency is improved, and the service life of a cutter is also prolonged. The arc chip flute changes the prior chip breaking to be realized by the interaction between the processed hole wall and the bit cutter body, and the chip breaking process is independently finished in the bit cutter body directly, so that the adverse effect of the acting force and the reacting force between the workpiece and the bit is avoided.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.

Claims (6)

1. The drill bit with the asymmetrical ligaments and the circular arc chip flutes comprises a drill bit body, wherein the drill bit body comprises a drill shank, a drill body and a drill tip, and is characterized in that one side of the drill body is provided with a drill flute part in an extending mode, the drill flute part is provided with two main ligaments which are arranged asymmetrically, one side of each main ligament faces the drill body and is provided with two main chip flutes, and the main ligaments and the main chip flutes are distributed in a spiral mode along the central axis of the drill bit body; the drill point is provided with two chip flutes, the two main ligaments form a chisel edge at the center of the front end face of the drill point, and the chip flutes are positioned at two sides of the chisel edge and are in smooth connection with the main chip grooves;

two auxiliary chip grooves are formed in the other side edges of the two main ligaments towards the drill body, the auxiliary chip grooves are distributed in a spiral mode along the central axis of the drill body, and auxiliary ligaments which encircle the auxiliary chip grooves in a circle are arranged in one auxiliary chip groove.

2. The drill bit with asymmetrical ligaments and circular arc chip flutes according to claim 1, characterized in that the angle between two main ligaments is 185 ° to 189 °.

3. The drill bit with asymmetrical ligament and circular arc chip flutes of claim 1, wherein the secondary chip flutes are formed with two chip channels through the secondary ligament.

4. A drill bit with asymmetrical ligaments and circular arc flutes according to claim 3, wherein the secondary ligament is provided in the middle of the secondary flutes, the two flutes being of uniform size.

5. The drill bit with asymmetrical ligament and circular arc chip flutes of claim 1, wherein the primary chip flute forms an end edge at the drill tip, the end edge forming two circular arc tooth gaps at the drill tip; the two end edges are asymmetrically arranged.

6. The drill bit with asymmetrical ligaments and circular arc flutes according to claim 1, wherein two of the flutes are circular arc shaped, asymmetrically disposed.