Drill bit special for forced chip breaking

Abstract

The utility model discloses a special drill bit for forced chip breaking, which comprises a cutting part and a cutter handle part, the cutting part at least comprises two cutting edges, a chip groove is arranged between the cutting edges, a zigzag cutting edge group is arranged on the end face of one side of each cutting edge and used for cutting and breaking chips in the chip groove, and a chip pocket is arranged on the end face of the other side of each cutting edge. By means of the special drill bit, aluminum alloy materials can be cut into small aluminum scraps, and the situation that due to the large aluminum scraps, a cutter is blocked and broken is avoided.

Description

Technical Field

[0001] The present application belongs to the field of tool processing, and specifically relates to a drill bit specially used for forced chip breaking. Background Art

[0002] In the prior art, aluminum alloy materials are cut and drilled by a drill. In this process, due to the physical characteristics of aluminum alloy, its cutting often produces large aluminum chips. If these aluminum chips cannot be discharged in a timely and effective manner, it will not only affect the processing efficiency, but also may cause poor chip removal, and even cause tool chip blockage and tool breakage. These problems seriously affect the efficiency and quality of aluminum alloy material processing.

[0003] Therefore, it is necessary to provide a special drill bit that can cut aluminum alloy materials into smaller aluminum chips to solve the problem that the existing drill bit produces large aluminum chips when drilling aluminum alloy materials, resulting in poor chip removal and causing tool chip blockage and tool breakage. Utility Model Content

[0004] The utility model aims to solve the problem that when the existing drill bit drills aluminum alloy materials, large aluminum chips are generated, resulting in poor chip removal and causing tool chip blockage and tool breakage.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A drill bit specially used for forced chip breaking comprises a cutting portion and a shank portion, wherein the cutting portion comprises at least two cutting edges symmetrically arranged about the axis center of the drill bit, a chip groove is arranged between the cutting edges, a serrated edge group is arranged on one end face of the cutting edge for cutting and breaking chips in the chip groove, and a chip containing groove is arranged on the other end face of the cutting edge.

[0007] Furthermore, the serrated blade group includes at least a first serrated blade and a second serrated blade; wherein, the width L1 of the first serrated blade is the same as the width L2 of the second serrated blade; the relationship between the width L1 of the first serrated blade, the width L2 of the second serrated blade and the radius L3 of the cutting portion is: L1=L2=k*L3 wherein 0.2≤k≤0.5.

[0008] Furthermore, the bottom of the serrated edge of the serrated edge group is also provided with a rounded corner, and the rounded corner R is set to be between 0 mm and 1 mm.

[0009] Furthermore, the cutting portion includes at least two cutting edges, specifically including: the cutting portion is symmetrically arranged with respect to the center axis of the drill bit with at least two cutting edges.

[0010] Furthermore, the cutting portion includes at least two cutting edges, specifically including: the cutting portion is provided with at least two cutting edges at equal angles along the circumference of the drill bit.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] The special drill bit for forced chip breaking provided by the present application can optimize the chip breaking performance of the cutting edge, effectively change the shape and size of aluminum chips, and thus achieve smooth chip removal. This eliminates the problem of tool chip blockage and tool breakage caused by larger aluminum chips in the past. While improving the processing life and processing efficiency of the tool, the safety of the process is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a special drill bit for forced chip breaking provided by the utility model;

[0014] Figure 2 Another schematic diagram of a special drill bit for forced chip breaking provided by the utility model;

[0015] Figure 3 for Figure 2 Another schematic diagram of the special drill bit for forced chip breaking provided by the utility model is a left view schematic diagram.

[0016] Serial numbers in the figure: 100, special drill for forced chip breaking; 10, cutting part; 20, handle part; 101, cutting edge; 102, chip groove; 1011, serrated cutting edge group; 10111, first serrated cutting edge; 10112, second serrated cutting edge; 1012, chip groove; 103, rounded corner. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] Reference Figures 1 to 3 The present application provides a drill bit 100 for forced chip breaking, comprising a cutting portion 10 and a shank portion 20. That is, the drill bit 100 for forced chip breaking is composed of a cutting portion 10 and a shank portion 20.

[0019] The cutting portion 10 includes at least two cutting edges 101 symmetrically arranged about the center axis of the drill bit, a chip groove 102 is provided between the cutting edges 101, a serrated edge group 1011 is provided on one end face of the cutting edge 101 for cutting and breaking chips in the chip groove 102, and a chip containing groove 1012 is provided on the other end face of the cutting edge 101.

[0020] Specifically, the cutting portion 10 may have two cutting edges 101 that are symmetrical about the center of the drill axis, or four cutting edges 101 that are symmetrical about the center of the drill axis, or three cutting edges 101 that are arranged at equal angles along the circumference of the drill. It is understood that the number of cutting edges 101 does not limit the specific protection scope of this patent. A chip groove 102 is provided between the cutting edges 101 to discharge the broken chips cut by the cutting edges 101 through the chip groove 102.

[0021] A serrated edge group 1011 is provided on one end face of the cutting edge 101 for cutting and breaking chips in the chip removal groove 102. The serrated edge group 1011 is mainly used to replace the previous drill bit that can only cut large aluminum chips with cutting into smaller aluminum chips for easy chip removal.

[0022] The other side end surface of the cutting edge 101 is provided with a chip groove 1012. The chip groove 1012 is mainly used to provide a space for accommodating waste chips cut by the cutting edge 101, so as to facilitate the chips to be discharged along the groove, and to prevent the chips from excessively increasing in volume, so as to facilitate smooth cutting.

[0023] It should also be noted that the top of the cutting portion 10 of the special drill for forced chip breaking provided in the present application is also provided with a drill tip for positioning the cutting portion 10. The cutting portion 10 and the shank portion 20 of the special drill for forced chip breaking are also provided with an internal cooling channel, one end of which is located on the cutting edge 101 of the cutting portion 10, i.e., the internal cooling hole; and the other end is located at the end of the shank portion 20.

[0024] Furthermore, the serrated edge group 1011 includes at least a first serrated edge 10111 and a second serrated edge 10112; wherein, the width L1 of the first serrated edge 10111 and the width L2 of the second serrated edge 10112 are the same; the relationship between the width L1 of the first serrated edge 10111 and the width L2 of the second serrated edge 10112 and the radius L3 of the cutting portion 10 is: L1=L2=k*L3 wherein 0.2≤k≤0.5.

[0025] Specifically, the sawtooth edge group 1011 is close to the tip of the cutting edge 101, and is sequentially a first sawtooth edge 10111 and a second sawtooth edge 10112. The relationship between the width L1 of the first sawtooth edge 10111 and the width L2 of the second sawtooth edge 10112 and the radius L3 of the cutting portion 10 is: L1 = L2 = k*L3; wherein 0.2≤k≤0.5.

[0026] It should be understood that the width L1 of the first sawtooth edge 10111 and the width L2 of the second sawtooth edge 10112 refer to the distance between the two ends of the sawtooth edge, that is, the tooth pitch. L1 = L2 = k*L3, 0.2 ≤ k ≤ 0.5, that is, the width L1 of the first sawtooth edge 10111 and the width L2 of the second sawtooth edge 10112 are between 0.2 times the radius of the cutting portion 10 and 0.5 times the radius of the cutting portion 10.

[0027] It should also be noted that the serrated edge group 1011 includes at least a first serrated edge 10111 and a second serrated edge 10112, and may also include a third serrated edge, a fourth serrated edge, etc. The specific number of the serrated edge groups 1011 is determined according to the radius of the cutting portion 10, and is generally set to be between 1 and 4.

[0028] Furthermore, one side end face of the first serrated edge 10111 and one side end face of the second serrated edge 10112 are respectively at an angle α and β to one side end face of the cutting edge; the angles α and β are set to be between 15° and 25°.

[0029] Specifically, the side end face of the first serrated edge 10111 and the side end face of the second serrated edge 10112 in the present application mainly refer to the side end faces that are at an acute angle to the side end face of the cutting edge. By setting α and β to between 15° and 25°, it can ensure that the serrated edge group 1011 can cut out smaller aluminum chips.

[0030] It can be understood that the setting of the width of the serrated edge group 1011, the setting of the end face of one side of the first serrated edge 10111 and the end face of one side of the second serrated edge 10112 at angles α and β to the end face of one side of the cutting edge respectively, are the means adopted in the present application to solve the problem of tool blockage and tool breakage caused by large aluminum chips produced during cutting in the past. By this means, it is possible to cut aluminum alloy materials into smaller aluminum chips.

[0031] Furthermore, the bottom of the serrated edge of the serrated edge group 1011 is further provided with a rounded corner 103, and the rounded corner 103R is set to be between 0 mm and 1 mm.

[0032] Specifically, the rounded corners 103 at the bottom of the sawtooth blades of the sawtooth blade set 1011 are manufactured by using a special grinding wheel. Similarly, the rounded corners 103 are also provided to discharge the chip discharge grooves 102 for cutting smaller broken chips.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A drill bit for forced chip breaking, comprising a cutting portion and a shank portion, characterized in that: The cutting part comprises at least two cutting edges, a chip groove is arranged between the cutting edges, a sawtooth edge group is arranged on one end face of the cutting edge for cutting and breaking chips in the chip groove, and a chip containing groove is arranged on the other end face of the cutting edge.

2. The drill bit for forced chip breaking according to claim 1, characterized in that: The serrated edge group comprises at least a first serrated edge and a second serrated edge; Wherein, the width L1 of the first sawtooth edge is the same as the width L2 of the second sawtooth edge; The relationship between the width L1 of the first serrated edge, the width L2 of the second serrated edge and the radius L3 of the cutting portion is: L1=L2=k*L3 Among them, 0.2≤k≤0.

5.

3. The drill bit for forced chip breaking according to claim 2, characterized in that: The end surface of one side of the first sawtooth cutting edge and the end surface of one side of the second sawtooth cutting edge are α and β with the end surface of one side of the cutting edge respectively; The angles α and β are set between 15° and 25°.

4. The drill bit for forced chip breaking according to claim 1, characterized in that: The bottom of the serrated edge of the serrated edge group is also provided with a rounded corner, and the rounded corner R is set to be between 0 mm and 1 mm.

5. The drill bit for forced chip breaking according to claim 1, characterized in that: The cutting portion includes at least two cutting edges, specifically including: The cutting portion is provided with at least two cutting edges symmetrically about the center of the drill axis.

6. The drill bit for forced chip breaking according to claim 1, characterized in that: The cutting portion includes at least two cutting edges, specifically including: The cutting portion is provided with at least two cutting edges at equal angles along the circumference of the drill bit.

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