A hard drill bit with cutting edge protection structure

Abstract

The utility model discloses a hard drill bit with a cutting edge protection structure, including a tool handle and a tool head connected to the tool handle, the tool head is provided with a chip removal groove, the front cutting face of the tool head is provided with a cutting edge chamfer arranged along the tool spiral angle, the cutting edge chamfer includes a first chamfer arranged at the edge of the chip removal groove and passing through the front cutting face and the entire cutting edge band, and a second chamfer formed by the intersection of the first chamfer and the front cutting face, the angle presented by the first chamfer is negative to the base surface to form an obtuse angle, the first chamfer cooperates with the second chamfer, so that the first chamfer bears the friction force during processing and the cutting edge is effectively protected under the action of the second chamfer. The utility model solves the problem that the existing drill bit is prone to surface sintering due to tool wear, resulting in reduced surface quality at the processing position or reduced tool processing accuracy and life.

Description

Technical Field

[0001] The utility model relates to the field of drill bits, in particular to a hard drill bit with a cutting edge protection structure. Background Art

[0002] Drill bits are widely used in the production and processing of automobile engines, including some ferrous metals such as steel and cast iron. When processing some workpieces with higher hardness, negative effects caused by tool wear often occur. For example, surface sintering will directly lead to reduced surface quality at the processing position, or reduce tool processing accuracy and life. The tool may even fail directly and be unable to complete the processing, making it difficult to meet the tool use requirements and achieve the expected processing effect. Utility Model Content

[0003] In view of the above-mentioned deficiencies of current drill bits, the utility model provides a hard drill bit with a cutting edge protection structure, which can effectively prevent surface sintering from causing a decrease in surface quality at the processing position, or a decrease in tool processing accuracy and life.

[0004] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0005] A hard drill with a cutting edge protection structure comprises a tool handle and a tool head connected to the tool handle, wherein the tool head is provided with a chip groove, and the front cutting face of the tool head is provided with a cutting edge chamfer arranged along the tool spiral angle, the cutting edge chamfer comprises a first chamfer arranged at the edge of the chip groove and passing through the front cutting face and the entire cutting edge band, and a second chamfer formed by the intersection of the first chamfer and the front cutting face, the angle presented by the first chamfer is negative to the base surface to form an obtuse angle, the first chamfer cooperates with the second chamfer so that the first chamfer bears the friction force during processing and the cutting edge is effectively protected under the action of the second chamfer, thereby extending the tool life.

[0006] According to one aspect of the utility model, the cutter head is made of cemented carbide.

[0007] According to one aspect of the utility model, the chip removal groove is an arc groove.

[0008] According to one aspect of the present invention, the number of the cutting edges is at least 2.

[0009] According to one aspect of the utility model, the helix angle of the cutting edge of the cutter head is not less than 30 degrees.

[0010] According to one aspect of the present invention, the length of the first chamfer extends along the cutting edge zone to the bottom of the cutting edge.

[0011] The advantages of the implementation of the utility model are as follows: by extending the tool spiral angle on the front cutting edge of the tool and adding a chamfer with an angle negative to the base surface, the tool edge is modified from a sharp point angle to a negative front angle, and the cutting edge that is subjected to friction during processing is changed from an acute angle to an obtuse angle, thereby effectively protecting the cutting edge and increasing the tool life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a right view of the utility model;

[0015] Figure 3 It is a structural schematic diagram of the chamfered edge protection described in the utility model.

[0016] 1. Tool handle; 2. Tool head; 3. Rake face; 4. Chip groove; 5. Cutting edge band; 6. Edge chamfer; 61. First chamfer; 62. Second chamfer; 7. Bottom of the chip cutting edge. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Embodiment 1:

[0019] like Figures 1 to 3As shown, a hard drill with a cutting edge protection structure includes a tool handle 1 and a tool head 2 connected to the tool handle 1, the tool head 2 is provided with a chip groove 4, the front cutting face 3 of the tool head 2 is provided with a cutting edge chamfer 6 arranged along the tool spiral angle, the cutting edge chamfer 6 includes a first chamfer 61 arranged at the edge of the chip groove 4 and passing through the front cutting face 3 and the entire cutting edge band 5, and a second chamfer 62 formed by the intersection of the first chamfer 61 and the front cutting face 3, the angle presented by the first chamfer 61 is negative to the base surface to form an obtuse angle, the first chamfer 61 cooperates with the second chamfer 62, so that the first chamfer 61 bears the friction force during processing and effectively protects the cutting edge under the action of the second chamfer 62, thereby extending the tool life. During the tool manufacturing process, after the grinding wheel has opened the chip groove 4, a first chamfer 61 is added to the edge of the chip groove 4 through the front cutting edge 3 and the entire cutting edge band 5. The chamfer length needs to be processed to the end position of the cutting edge. The angle of this chamfer is negative to the base surface. The intersection of the front cutting edge 3 and the chamfer will naturally form a second chamfer 62, which can also play a role in protecting the cutting edge. Together with the cutting edge chamfer, it increases the tool strength and thus extends the tool life.

[0020] The width of the first chamfer is determined by the tool diameter to avoid the chamfer being too large, which will increase the cutting resistance, or the chamfer being too small to protect the cutting edge.

[0021] In practical applications, the material of the cutter head 2 is hard alloy, such as tungsten-cobalt hard alloy, tungsten-cobalt-titanium hard alloy, etc. The service life of the cutter can be increased by selecting a suitable hard alloy.

[0022] In practical applications, the chip removal groove 4 is an arc groove, which reduces the friction resistance between the tool and the workpiece, reduces the heat generated during the use of the tool, and facilitates the discharge of waste chips.

[0023] In practical applications, the number of cutting edges is at least 2.

[0024] In practical applications, the helix angle of the cutting edge of the cutter head 2 is not less than 30 degrees. By selecting a suitable helix angle, the cutter can be more adaptable to high-intensity processing.

[0025] In practical applications, the length of the first chamfer 61 extends to the bottom of the cutting edge along the cutting edge band 5. The first chamfer 61 reduces the friction force borne by the entire cutting edge, thereby increasing the tool life.

[0026] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A hard drill bit with a cutting edge protection structure, comprising a tool handle (1) and a tool head (2) connected to the tool handle (1), wherein the tool head (2) is provided with a chip removal groove (4), characterized in that: The front cutting edge (3) of the tool head (2) is provided with a protective chamfer (6) arranged along the tool spiral angle, and the protective chamfer (6) comprises a first chamfer (61) arranged at the edge of the chip groove (4) and passing through the front cutting edge (3) and the entire cutting edge band (5), and a second chamfer (62) formed by the intersection of the first chamfer (61) and the front cutting edge (3), the angle presented by the first chamfer (61) is negative to the base surface to form an obtuse angle, and the first chamfer (61) and the second chamfer (62) cooperate so that during processing, the first chamfer (61) bears the friction force and the cutting edge is effectively protected under the action of the second chamfer (62).

2. A hard drill bit with a cutting edge protection structure according to claim 1, characterized in that: The cutter head (2) is made of hard alloy.

3. A hard drill bit with a cutting edge protection structure according to claim 1, characterized in that: The chip removal groove (4) is an arc-shaped groove.

4. The hard drill bit with a cutting edge protection structure according to claim 1, characterized in that: The number of the cutting edges is at least 2.

5. The hard drill bit with a cutting edge protection structure according to claim 1, characterized in that: The helix angle of the cutting edge of the cutter head (2) is not less than 30 degrees.

6. A hard drill bit with a cutting edge protection structure according to any one of claims 1 to 5, characterized in that: The length of the first chamfer (61) extends along the cutting edge zone (5) to the cutting edge bottom (7).

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