A friction-reducing four-edge drill bit made of superhard material

Abstract

The utility model discloses a friction-reducing four-edge-band superhard material drill bit, comprising a drill shank and a drill bit connected to the drill shank, wherein the drill bit is evenly provided with four spiral edge bands, wherein the spiral edge bands include a main edge band and a supporting edge band, wherein a shovel back is provided between the main edge band and the supporting edge band, wherein a transition arc formed by a grinding wheel feeding through a predetermined geometric angle is provided on the shovel back, wherein the transition arc reduces the friction between the processed aperture and the shovel back by increasing the gap between the edge band and the shovel back. The utility model solves the problem that a four-edge-band drill bit is easily damaged due to high friction.

Description

Technical Field

[0001] The utility model relates to the field of drill bits, in particular to a friction-reducing four-edge-band superhard material drill bit. Background Art

[0002] The four-edge spiral drill bit is a widely used mechanical processing tool with the characteristics of high efficiency, stability and durability. It is mainly used in the processing of ferrous metals such as steel and cast iron.

[0003] The four-edge spiral drill can achieve high drilling accuracy, stable processing, high processing efficiency, and high surface finish of the processed surface. However, the high surface finish and stable processing often rely on the good support effect brought by the four edge bands. During processing, the four edge bands will also generate greater friction. The cutting heat caused by the friction will sharply reduce the tool life. What's more, in some special working conditions, the cutting resistance converted by the greater friction will cause the tool to break directly. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the current drill bits, the utility model provides a friction-reducing four-edge-band superhard material drill bit, which can achieve the technical effect of reducing friction and thus increasing the life of the tool.

[0005] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0006] A friction-reducing four-edge-band superhard material drill bit comprises a drill shank and a drill bit connected to the drill shank, wherein the drill bit is evenly provided with four spiral edge bands, the spiral edge bands comprising a main edge band and a supporting edge band, a relief back is provided between the main edge band and the supporting edge band, the relief back is provided with a transition arc formed by a grinding wheel 7 feeding at a predetermined geometric angle, the transition arc reduces the friction between the processed hole diameter and the relief back by increasing the gap between the edge band and the relief back.

[0007] According to one aspect of the utility model, the drill bit is made of cemented carbide.

[0008] According to one aspect of the utility model, the outer periphery of the drill bit is coated with a wear-resistant coating.

[0009] According to one aspect of the utility model, the edge width of the main edge band is not greater than 2% of the drill bit diameter.

[0010] According to one aspect of the utility model, the drill shank and the drill bit are integrally formed.

[0011] According to one aspect of the utility model, the diameter of the rear end of the drill bit is larger than the diameter of the front end of the drill bit.

[0012] According to one aspect of the present invention, the predetermined geometric angle is 60°-75°.

[0013] Advantages of the implementation of the utility model: The utility model uses a grinding wheel and a special feed geometry angle at the transition position between the main edge band, the supporting edge band and the back of the shovel, increases the transition arc and increases the gap between the edge band and the back of the shovel, reduces the friction between the processed hole diameter and the back of the shovel, and thus increases the tool life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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.

[0015] Figure 1 It is a schematic diagram of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the drill bit of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the transition arc described in the utility model;

[0018] Figure 4 It is a structural schematic diagram of the transition section of the utility model.

[0019] 1. Drill shank; 2. Drill bit; 3. Main edge band; 4. Shovel back; 5. Support edge band; 6. Transition arc; 7. Grinding wheel; 8. Processed hole diameter; 9. Transition section. DETAILED DESCRIPTION

[0020] 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.

[0021] Embodiment 1:

[0022] like Figures 1 to 4As shown, a friction-reducing four-edge-band superhard material drill bit includes a drill shank 1 and a drill bit 2 connected to the drill shank 1. Four spiral edge bands are evenly distributed on the drill bit 2. The spiral edge bands include a main edge band 3 and a supporting edge band 5. A relief back 4 is provided between the main edge band 3 and the supporting edge band 5. The relief back 4 is provided with a transition arc 6 formed by a grinding wheel 7 feeding at a predetermined geometric angle. The transition arc 6 reduces the friction between the processed hole diameter 8 and the relief back 4 by increasing the gap between the edge band and the relief back 4. The prior art will adopt the following method: Figure 3 The transition section 9 shown has huge friction and is very easy to wear and damage. The utility model further improves the transition section 9 into a transition arc 6. By increasing the gap between the blade and the back of the shovel 4, the friction between the processed hole diameter 8 and the back of the shovel 4 is reduced, thereby extending the life of the drill bit 2 and significantly improving the processing dimensional accuracy.

[0023] 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.

[0024] In practical applications, the outer periphery of the drill bit 2 is coated with a wear-resistant coating, such as a titanium carbonitride coating or an aluminum titanium nitrogen coating, which can effectively improve the wear resistance of the product.

[0025] In practical applications, the edge width of the main edge band 3 is no greater than 2% of the diameter of the drill bit 2. The cutting performance of the main edge band is improved.

[0026] In practical applications, the drill handle 1 and the drill bit 2 are integrally formed, thereby increasing the service life of the product.

[0027] In practical applications, the diameter of the rear end of the drill bit 2 is larger than the diameter of the front end of the drill bit 2. The strength and stability of the margin are increased by appropriate taper design.

[0028] In practical applications, the predetermined geometric angle is 60°-75°. Figure 2 The central longitudinal axis is the reference line.

[0029] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technology in the 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 friction-reducing four-edge-band superhard material drill bit, comprising a drill shank (1) and a drill bit (2) connected to the drill shank (1), wherein the drill bit (2) is evenly provided with four spiral edge bands, wherein the spiral edge bands include a main edge band (3) and a supporting edge band (5), wherein a relief back (4) is provided between the main edge band (3) and the supporting edge band (5), wherein the relief back (4) is provided with a transition arc (6) formed by a grinding wheel (7) feeding at a predetermined geometric angle, wherein the transition arc (6) reduces the friction between a processed hole diameter (8) and the relief back (4) by increasing the gap between the edge band and the relief back (4).

2. The anti-friction four-edge-band superhard material drill bit according to claim 1, characterized in that: The drill bit (2) is made of hard alloy.

3. The anti-friction four-edge-band superhard material drill bit according to claim 1, characterized in that: The outer periphery of the drill bit (2) is coated with a wear-resistant coating.

4. The anti-friction four-edge-band superhard material drill bit according to claim 1, characterized in that: The edge width of the main edge band (3) is no greater than 2% of the diameter of the drill bit (2).

5. The anti-friction four-edge-band superhard material drill bit according to claim 1, characterized in that: The drill shank (1) and the drill bit (2) are integrally formed.

6. The anti-friction four-edge-band superhard material drill bit according to claim 1, characterized in that: The diameter of the rear end of the drill bit (2) is greater than the diameter of the front end of the drill bit (2).

7. A friction-reducing four-edge-band superhard material drill according to any one of claims 1 to 6, characterized in that: The predetermined geometric angle is 60°-75°.

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