Three-blade high-precision centering deep hole spiral machining drill bit

Abstract

The utility model discloses a three-edge high-precision centering deep hole spiral machining drill bit which comprises a drill body and a drill bit body connected with the drill body, the drill bit body is connected with a cooling system, three cutting edges are arranged on the drill bit body, chip grooves are formed in the cutting edges, an inner cooling hole communicated with the cooling system is formed in the tip end of the drill bit body, and the inner cooling hole is communicated with the cooling system. A supporting guide strip is arranged on the same side of each cutting edge, an anti-friction front angle is arranged on the front tool face of each chip groove, a special-shaped drill tip used for positioning the punching center of an object to be punched is arranged at the tip end of the drill bit, the front tool faces of the chip grooves are naturally transited to the outer contours of the chip grooves through the anti-friction front angles, and therefore friction between cuttings and the drill bit is reduced, and the punching precision of the object to be punched is improved. And the centering of the object to be punched is realized through the special-shaped drill tip. The wear resistance and the chip removal effect of the drill bit can be effectively improved, and the high-precision centering function is achieved.

Description

Technical Field

[0001] The utility model relates to the field of drill bits, in particular to a three-blade high-precision centering deep hole spiral processing drill bit. Background Art

[0002] In the mechanical processing industry, drill bits are widely used in drilling operations of various materials. Although traditional spiral drill bits can meet most processing needs to a certain extent, the use effect of ordinary drill bits is unsatisfactory under certain specific working conditions and conditions with high technical requirements. For example: the tolerance range of the position of the processed hole is small and the tool positioning is too poor; when drilling on inclined surfaces, the equipment spindle is tilted and the tool cannot process efficiently; in through-hole processing and cross-hole processing, the hole diameter changes continuously with the depth; deep hole processing cannot break chips, which blocks the tool chip groove, increases the equipment load, and leads to the risk of tool breakage. Utility Model Content

[0003] In view of the above-mentioned deficiencies of the current drill bits, the utility model provides a three-blade high-precision centering deep hole spiral processing drill bit, which can effectively improve the wear resistance and chip removal effect of the drill bit and realize the high-precision centering function.

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

[0005] A three-blade high-precision centering deep hole spiral processing drill, comprising a drill body and a drill connected to the drill body, the drill bit being connected to a cooling system, the drill bit being provided with three cutting edges, the cutting edges being provided with chip grooves, the drill bit tip being provided with an internal cooling hole connected to the cooling system, a support guide bar being provided on the same side of each of the cutting edges, the front cutting edge face of the chip groove being provided with a friction reducing front angle, the drill bit tip being provided with a special-shaped drill tip for locating the center of a hole to be punched, the front cutting edge face of the chip groove being naturally transitioned to the outer contour of the chip groove through the friction reducing front angle, so that the friction between the drill bit and the chips is reduced, and the object to be punched is centered through the special-shaped drill tip.

[0006] According to one aspect of the present invention, the helix angle of the cutting edge is not less than 40 degrees.

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

[0008] According to one aspect of the utility model, the drill tip is provided with a cutting edge chip groove.

[0009] According to one aspect of the present invention, the special-shaped drill tip is a non-linear drill tip.

[0010] According to one aspect of the utility model, the drill bit is made of cemented carbide.

[0011] According to one aspect of the utility model, the outer periphery of the drill bit is coated with a wear-resistant coating.

[0012] According to one aspect of the utility model, the drill bit is made of cemented carbide.

[0013] According to one aspect of the utility model, the angle of the friction-reducing front angle is 5-15 degrees.

[0014] Advantages of the utility model:

[0015] The rake angle design of the tool chip groove enhances the tool drilling ability to a certain extent. The rake face and the chip groove contour have a natural transition, which can reduce the friction between the chips and the drill bit, improve the rigidity and toughness of the tool, and have excellent chip removal function; the special-shaped drill tip can achieve precise positioning of the drilling center of the object to be punched. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a right side view of the utility model;

[0019] Figure 3 A schematic diagram of the utility model.

[0020] 1. Drill body; 2. Drill bit; 3. Chip groove; 4. Cutting edge; 5. Support guide bar; 6. Internal cooling hole; 7. Friction-reducing front angle; 8. Cooling hole; 9. Special-shaped drill tip; 10. Chip groove at the tip. DETAILED DESCRIPTION

[0021] 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.

[0022] Embodiment 1:

[0023] like Figures 1 to 3As shown, a three-blade high-precision centering deep hole spiral processing drill comprises a drill body 1 and a drill bit 2 connected to the drill body 1, the drill bit 2 is connected to a cooling system, three cutting edges 4 are provided on the drill bit 2, the cutting edges 4 are provided with chip grooves 3, the tip of the drill bit 2 is provided with an internal cooling hole 6 connected to the cooling system, a support guide bar 5 is provided on the same side of each cutting edge 4, the front cutting edge face of the chip groove 3 is provided with a friction reducing front angle 7, the tip of the drill bit 2 is provided with a special-shaped drill tip 9 for locating the center of the hole to be punched, the front cutting edge face of the chip groove 3 is naturally transitioned to the outer contour of the chip groove 3 through the friction reducing front angle 7, so that the friction between the drill bit 2 and the chips is reduced, and the object to be punched is centered by the special-shaped drill tip 9.

[0024] In this embodiment, the cooling medium is a cooling liquid or a cooling gas, such as nitrogen, saponified oil, cutting fluid, water-based cooling liquid, etc.

[0025] In practical applications, the helix angle of the cutting edge 4 is not less than 40 degrees. By selecting a suitable helix angle, the tool can be more adaptable to high-intensity processing.

[0026] In practical applications, the chip removal groove 3 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.

[0027] In practical applications, the tip of the drill bit 2 is provided with a tool tip chip groove 10. The tool tip chip groove 10 controls the outflow direction of the chips, so that the chips can be discharged smoothly, preventing the chips from interfering with the machining process or injuring the operator.

[0028] In practical application, the special-shaped drill tip 9 is a non-linear drill tip. The special-shaped drill tip 9 is convenient for centering the object to be punched.

[0029] In practical applications, the drill bit 2 is made of hard alloy, such as tungsten-cobalt hard alloy, tungsten-cobalt-titanium hard alloy, etc. The service life of the tool can be increased by selecting a suitable hard alloy.

[0030] In practical applications, the outer periphery of the drill bit 2 is coated with a wear-resistant coating. According to different processed materials, corresponding metal coatings are selected to increase the wear resistance life of the tool.

[0031] In practical applications, the anti-friction front angle 7 is 5-15 degrees.

[0032] 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 three-edge high-precision centering deep hole spiral processing drill, comprising a drill body (1) and a drill bit (2) connected to the drill body (1), the drill bit (2) being connected to a cooling system, the drill bit (2) being provided with three cutting edges (4), the cutting edges (4) being provided with a chip removal groove (3), characterized in that: The tip of the drill bit (2) is provided with an internal cooling hole (6) connected to the cooling system, a support guide bar (5) is provided on the same side of each cutting edge (4), the front cutting edge of the chip groove (3) is provided with a friction reducing rake angle (7), the tip of the drill bit (2) is provided with a special-shaped drill tip (9) for locating the center of the hole to be punched, the tip of the drill bit (2) is provided with a tool tip chip groove (10), the angle of the friction reducing rake angle (7) is 5-15 degrees, the front cutting edge of the chip groove (3) is naturally transitioned to the outer contour of the chip groove (3) through the friction reducing rake angle (7), so that the friction between the drill bit (2) and the chips is reduced, and the object to be punched is centered through the special-shaped drill tip (9).

2. A three-edge high-precision centering deep hole spiral processing drill according to claim 1, characterized in that: The helix angle of the cutting edge (4) is not less than 40 degrees.

3. A three-edge high-precision centering deep hole spiral processing drill according to claim 1, characterized in that: The chip removal groove (3) is an arc-shaped groove.

4. A three-edge high-precision centering deep hole spiral processing drill according to claim 1, characterized in that: The special-shaped drill tip (9) is a non-linear drill tip.

5. The three-edge high-precision centering deep hole spiral processing drill according to claim 1, characterized in that: The drill bit (2) is made of hard alloy.

6. A three-edge high-precision centering deep hole spiral processing drill according to claim 1, characterized in that: The outer periphery of the drill bit (2) is coated with a wear-resistant coating.

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