A stepped drill with a chip breaker groove

Abstract

The utility model discloses a kind of step drills with chip breaker groove, belong to plate processing cutter technical field, solve the problem of existing step drill chip removal performance is not good. It includes shank and tool bit, the tool bit is sequentially provided with step blade and end cutting edge along the side away from shank, the shank is also provided with at least two spiral chip flutes of uniform distribution, one end of each spiral chip flute is all through to the outer end of end cutting edge, another end is all through step blade and extends to the shank above step blade, the diameter of step blade, end cutting edge is all greater than the diameter of tool bit, and the diameter of end cutting edge is less than the diameter of step blade, the end cutting edge outer end between adjacent two spiral chip flutes is equipped with a chip breaker groove, and one end of the chip breaker groove extends to the groove wall of spiral chip flute, another end extends to the outer wall of end cutting edge. The step drill of the utility model can break wood chip in the position of end cutting edge, greatly improve chip removal performance.

Description

Technical Field

[0001] This utility model relates to the field of cutting tools for sheet metal processing, and more specifically, it relates to a stepped drill with chip-breaking grooves. Background Technology

[0002] Step drills are specialized tools for machining stepped holes and are widely used in the woodworking industry. Existing step drills, such as the insert-type woodworking step drill disclosed in CN218365351U, include an alloy drill head, a stepped cutting edge, and a tool body. The stepped cutting edge is equipped with a helical cutting edge, a cutting edge, and a splitting edge. The splitting edge has a chip-breaking groove with its opening facing the alloy drill head. This effectively solves the technical problem of chips entangled on the drill bit during drilling, leading to difficult chip removal, requiring manual cleaning, and reducing production efficiency. It provides a simple, easy-to-use step drill that prevents chips from entangled on the drill bit.

[0003] Existing stepped drills with chip-breaking grooves have the chip-breaking grooves located at the step edge. During the cutting process, the wood chips cut off by the cutting edge at the end of the drill bit need to be discharged through the spiral chip removal groove to the step edge before they can be broken by the chip-breaking groove. The wood chips cut off by the cutting edge at the end are still easy to get stuck in the spiral chip removal groove, indicating that the chip removal performance of existing stepped drills still needs to be improved.

[0004] Therefore, a step drill with chip-breaking grooves is proposed to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the prior art by providing a stepped drill with a chip-breaking groove, which can break wood chips at the end cutting edge and greatly improve chip removal performance.

[0006] The technical solution of this utility model is as follows: A stepped drill with chip-breaking grooves includes a shank and a drill head. The drill head has a stepped cutting edge and an end cutting edge arranged sequentially along the side away from the shank. The drill head also has at least two evenly distributed spiral chip-removing grooves. One end of each spiral chip-removing groove extends to the outer end of the end cutting edge, and the other end extends through the stepped cutting edge and extends to the shank above the stepped cutting edge. The diameters of the stepped cutting edge and the end cutting edge are both larger than the diameter of the drill head, and the diameter of the end cutting edge is smaller than the diameter of the stepped cutting edge. A chip-breaking groove is provided at the outer end of the end cutting edge between two adjacent spiral chip-removing grooves, and one end of the chip-breaking groove extends to the groove wall of the spiral chip-removing groove, and the other end extends to the outer wall of the end cutting edge.

[0007] As a further improvement, the outer ends of the end cutting edges between two adjacent spiral chip removal grooves are respectively provided with a first inclined surface and a second inclined surface that are inclined toward the center of the end cutting edge. The first inclined surface and the second inclined surface are arranged in sequence along the radial direction of the end chip cutting edge, and the slope of the first inclined surface is less than the slope of the second inclined surface.

[0008] Furthermore, a chip groove is also provided at the outer end of the cutting edge on the front side of the first inclined plane.

[0009] Furthermore, the end cutting edge includes an end tool holder and at least two end cutting edges. The end tool holder is integrally formed on the tool head, and an end cutting edge is integrally formed on each end tool holder on one side of the spiral chip removal groove. The chip breaking groove, the first inclined surface, the second inclined surface, and the chip receiving groove are all located at the outer end of the end tool holder.

[0010] Furthermore, the diameters of the end tool holder and the end blade are both greater than the diameter of the blade head, and the diameter of the end blade is greater than the diameter of the end tool holder.

[0011] Furthermore, the stepped cutting edge includes a stepped tool holder and at least two stepped cutting edges. The stepped tool holder is integrally formed on the cutting head, and a stepped cutting edge is welded and fixed on the stepped tool holder on one side of each spiral chip removal groove.

[0012] Furthermore, the diameters of the stepped tool holder and the stepped cutting edge are both larger than the diameter of the tool head, and the diameter of the stepped cutting edge is larger than the diameter of the stepped tool holder.

[0013] Furthermore, the blade head and the handle are an integral structure.

[0014] Furthermore, the end of the tool holder away from the tool tip has a threaded groove.

[0015] Beneficial effects

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] This utility model of a stepped drill incorporates a chip-breaking groove in the end cutting edge. The wood chips initially cut by the end cutting edge are immediately broken up by this groove, achieving chip breaking at the end cutting edge. The broken chips are then discharged through a spiral chip removal groove, effectively preventing wood chips from accumulating and getting stuck, thus greatly improving chip removal performance. Simultaneously, the diameter of the end cutting edge is larger than the diameter of the drill head, creating a gap between the hole wall cut by the end cutting edge and the drill head. This increases the clearance space between the drill head and the hole, improving ventilation and further reducing chip clogging. Attached Figure Description

[0018] Figure 1This is a three-dimensional illustration of the present invention. Figure 1 ;

[0019] Figure 2 This is a three-dimensional illustration of the present invention. Figure 2

[0020] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0021] Figure 4 This is a schematic diagram of the main structure of this utility model.

[0022] Wherein: 1-tool holder, 2-tool head, 3-stepped cutting edge, 4-end cutting edge, 5-spiral chip removal groove, 6-chip breaking groove, 7-first inclined surface, 8-second inclined surface, 9-chip removal groove, 10-thread groove, 31-stepped tool holder, 32-stepped cutting edge, 41-end tool holder, 42-end cutting edge. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0024] See Figure 1-4 This utility model discloses a stepped drill bit with chip-breaking grooves, comprising a shank 1 and a drill head 2, wherein both the shank 1 and the drill head 2 are cylindrical. A stepped cutting edge 3 and an end cutting edge 4 are sequentially provided on the side of the drill head 2 away from the shank 1. The stepped cutting edge 3 is located on the end of the drill head 2 near the shank 1, and the end cutting edge 4 is located on the end of the drill head 2 away from the shank 1, forming a stepped drill bit. At least two evenly distributed spiral chip-removing grooves 5 are also provided on the drill head 2 for discharging chips. In this embodiment, there are two spiral chip-removing grooves 5. One end of each spiral chip-removing groove 5 penetrates to the outer end of the end cutting edge 4, and the other end penetrates the stepped cutting edge 3 and extends to the shank 1 above the stepped cutting edge 3, thereby discharging wood chips above the stepped cutting edge 3. The diameters of the stepped edge 3 and the end cutting edge 4 are both larger than the diameter of the cutter head 2, and the diameter of the end cutting edge 4 is smaller than the diameter of the stepped edge 3. A chip breaking groove 6 is provided at the outer end of the end cutting edge 4 between two adjacent spiral chip removal grooves 5. The chip breaking groove 6 is an arc-shaped groove used to break the wood chips. One end of the chip breaking groove 6 extends to the groove wall of the spiral chip removal groove 5, and the other end extends to the outer wall of the end cutting edge 4, which can guide the wood chips into the spiral chip removal groove 5.

[0025] This utility model of a stepped drill incorporates a chip-breaking groove 6 in the end cutting edge 4 at the drill's end. The wood chips initially cut by the end cutting edge 4 are immediately broken up by the chip-breaking groove 6, achieving chip breaking at the position of the end cutting edge 4. The broken chips are then discharged through a spiral chip removal groove 5, effectively preventing wood chips from accumulating and getting stuck in the spiral chip removal groove, thus greatly improving chip removal performance. Simultaneously, the diameter of the end cutting edge 4 is larger than the diameter of the drill head 2, creating a certain gap between the hole wall cut by the end cutting edge 4 and the drill head, increasing the clearance space between the holes in the drill head 2, improving ventilation performance, and further reducing chip clogging problems.

[0026] Preferably, the outer ends of the end cutting edges 4 between two adjacent spiral chip removal grooves 5 are respectively provided with a first inclined surface 7 and a second inclined surface 8 that are inclined toward the center of the end cutting edge 4. The first inclined surface 7 and the second inclined surface 8 are arranged outward in a radial direction along the end cutting edge 4, so that the outer end of the end cutting edge 4 has a pointed structure, which allows the drill bit to cut into the plate better. In addition, the slope of the first inclined surface 7 is smaller than the slope of the second inclined surface 8, and the slope near the end of the end cutting edge 4 is relatively small, which can effectively improve its structural strength.

[0027] Preferably, a chip groove 9 is also provided at the outer end of the end cutting edge 4 on the front side of the first inclined surface 7. On the one hand, this can make the outer end of the end cutting edge 4 sharper, and on the other hand, it can increase the cutting space and make the wood chips easier to be discharged along the spiral chip discharge groove 5.

[0028] Preferably, the end cutting edge 4 includes an end tool holder 41 and at least two end cutting edges 42. The end tool holder 41 is integrally formed on the cutter head 2, and an end cutting edge 42 is integrally formed on one side of the end tool holder 41 of each spiral chip removal groove 5, thereby connecting the end cutting edge 4 to the cutter head 2. The chip breaking groove 6, the first inclined surface 7, the second inclined surface 8, and the chip receiving groove 9 are all located at the outer end of the end tool holder 41. Further, the diameters of the end tool holder 41 and the end cutting edges 42 are both larger than the diameter of the cutter head 2, and the diameter of the end cutting edges 42 is larger than the diameter of the end tool holder 41, so that the diameter of the hole cut by the end cutting edge 4 is larger than the diameter of the cutter head 2.

[0029] Preferably, the stepped cutting edge 3 includes a stepped tool holder 31 and at least two stepped cutting edges 32. The stepped tool holder 31 is integrally formed on the cutting head 2, and a stepped cutting edge 32 is welded and fixed on the stepped tool holder 31 on one side of each spiral chip removal groove 5, thereby connecting the stepped cutting edge 3 to the cutting head 2. Furthermore, the diameters of both the stepped tool holder 31 and the stepped cutting edges 32 are larger than the diameter of the cutting head 2, and the diameter of the stepped cutting edges 32 is larger than the diameter of the stepped tool holder 31, enabling the stepped drill to drill stepped holes.

[0030] Preferably, the blade head 2 and the handle 1 are integrated into one piece, which is convenient to manufacture and has better structural strength.

[0031] Preferably, a threaded groove 10 is provided at the end of the tool holder 1 away from the tool head 2, so as to facilitate the installation of the step drill on the machine tool spindle.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present utility model, and these will not affect the implementation effect of the present utility model or the practicality of the patent.

Claims

1. A stepped drill with chip-breaking grooves, comprising a shank (1) and a drill bit (2), wherein the drill bit (2) is provided with a stepped cutting edge (3) and an end cutting edge (4) sequentially along the side away from the shank (1), and the drill bit (2) is further provided with at least two evenly distributed spiral chip-removing grooves (5), characterized in that, One end of each of the spiral chip removal grooves (5) extends to the outer end of the end cutting edge (4), and the other end extends through the stepped edge (3) and to the tool holder (1) above the stepped edge (3). The diameters of the stepped edge (3) and the end cutting edge (4) are both greater than the diameter of the tool head (2), and the diameter of the end cutting edge (4) is smaller than the diameter of the stepped edge (3). A chip breaking groove (6) is provided at the outer end of the end cutting edge (4) between two adjacent spiral chip removal grooves (5), and one end of the chip breaking groove (6) extends to the groove wall of the spiral chip removal groove (5), and the other end extends to the outer wall of the end cutting edge (4).

2. A step drill with chip-breaking grooves according to claim 1, characterized in that, The outer ends of the end cutting edges (4) between two adjacent spiral chip removal grooves (5) are respectively provided with a first inclined surface (7) and a second inclined surface (8) that are inclined toward the center of the end cutting edge (4). The first inclined surface (7) and the second inclined surface (8) are arranged outward along the radial direction of the end cutting edge (4), and the slope of the first inclined surface (7) is less than the slope of the second inclined surface (8).

3. A step drill with chip-breaking grooves according to claim 2, characterized in that, The cutting edge (4) at the front end of the first inclined surface (7) is also provided with a chip groove (9).

4. A step drill with chip-breaking grooves according to claim 3, characterized in that, The end cutting edge (4) includes an end tool holder (41) and at least two end cutting edges (42). The end tool holder (41) is integrally formed on the cutter head (2). Each end tool holder (41) on one side of the spiral chip removal groove (5) has an integrally formed end cutting edge (42). The chip breaking groove (6), the first inclined surface (7), the second inclined surface (8), and the chip receiving groove (9) are all located at the outer end of the end tool holder (41).

5. A stepped drill with chip-breaking grooves according to claim 4, characterized in that, The diameters of the end blade holder (41) and the end blade (42) are both greater than the diameter of the blade head (2), and the diameter of the end blade (42) is greater than the diameter of the end blade holder (41).

6. A step drill with chip-breaking grooves according to claim 1, characterized in that, The stepped cutting edge (3) includes a stepped cutting edge holder (31) and at least two stepped cutting edges (32). The stepped cutting edge holder (31) is integrally formed on the cutting head (2). A stepped cutting edge (32) is welded and fixed on the stepped cutting edge holder (31) on one side of each spiral chip removal groove (5).

7. A step drill with chip-breaking grooves according to claim 6, characterized in that, The diameters of the stepped tool holder (31) and the stepped cutting edge (32) are both greater than the diameter of the tool head (2), and the diameter of the stepped cutting edge (32) is greater than the diameter of the stepped tool holder (31).

8. A step drill with chip-breaking grooves according to any one of claims 1-7, characterized in that, The blade head (2) and the handle (1) are an integral structure.

9. A step drill with chip breaker groove according to claim 8, characterized in that, The end of the handle (1) away from the blade (2) has a threaded groove (10).

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