Cross-shaped drill bit with alloy auxiliary blades and chip removal optimization design

Abstract

The utility model discloses a cross-shaped drill bit with an alloy auxiliary edge and an optimized chip removal design, which comprises a main cutting edge and an auxiliary cutting edge vertically crossed with the main cutting edge, and the auxiliary cutting edge is made of a wear-resistant alloy material so as to enhance the cutting durability. The chip removal notch groove is formed in the connecting position of the auxiliary cutting edge and the main cutting edge, the arc-shaped face is arranged on the side, away from the main cutting edge, of the notch groove, cuttings can rapidly break away from a cutting area, abrasion of the auxiliary cutting edge is effectively reduced, and the service life of the cutter is prolonged. The chip removal space is composed of the first inclined face and the second inclined face which are different in inclination angle, a chip removal channel is further enlarged, chip removal is smoother, and chip blockage and friction heat are reduced. And the cutter bar is provided with a chip removal arc-shaped groove which is communicated with the second inclined surface, so that the stable chip removal effect during long-time high-load machining is ensured. By optimizing the structural design, efficient chip removal and protection of the auxiliary cutting edge in the drilling process are achieved, the machining efficiency and the durability of the tool are remarkably improved, and the tool is suitable for machining of high-difficulty materials.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a cross-shaped drill bit with an alloy auxiliary cutting edge and optimized chip removal design. Background Technology

[0002] Drill bits are crucial tools in machining for cutting materials, drilling, and creating holes, and are widely used in the processing of metals, wood, and other hard materials. Cross-shaped drill bits, through the combination of their primary and secondary cutting edges, offer greater stability during the cutting process, especially in drilling high-strength or high-hardness materials. However, with the increasing complexity of machining conditions and the rise in material hardness, traditional cross-shaped drill bits have gradually revealed some problems in application, affecting machining efficiency and drill life.

[0003] Existing cross-shaped drill bits typically employ a simple primary and secondary cutting edge structure, and remove chips generated during the cutting process by creating chip removal grooves on the drill bit. However, this chip removal structure has the following problems:

[0004] 1. Poor chip removal, leading to chip blockage: Existing chip removal groove designs are usually quite simple and cannot effectively handle the large amount of chips produced during drilling, especially in high-hardness materials or long-term continuous machining. Chips tend to accumulate on the drill bit surface, resulting in poor chip removal. Chip accumulation not only increases machining friction but also causes drill bit overheating, further accelerating tool wear and reducing drilling accuracy.

[0005] 2. Secondary cutting edge is prone to wear: In traditional designs, the secondary cutting edge directly participates in the cutting process, maintains long-term contact with the material, and is subjected to significant cutting forces. Especially in high-intensity drilling, chips easily accumulate around the secondary cutting edge, leading to severe wear and a shortened service life. Current technologies typically improve wear resistance by strengthening the cutting edge material to reduce wear, but the effect is limited and cannot fundamentally solve the chip accumulation problem.

[0006] 3. Inadequate chip removal channel design affects cutting efficiency: Traditional chip removal channels are not designed to accommodate different angles and spaces, resulting in narrow channels, complex chip removal paths, and chip accumulation in specific areas. Especially when machining deep holes or hard materials, the chip removal channel cannot effectively remove chips in a timely manner, reducing machining efficiency, increasing cutting resistance, and affecting drilling stability.

[0007] To address these issues, the industry typically employs methods such as increasing the width of the chip flutes or optimizing the cutting edge material to reduce chip buildup or extend tool life. However, these improvements also introduce new problems in practical applications. Increasing the width of the chip flutes often weakens tool strength, making the tool more prone to breakage under high-load machining; while relying solely on reinforcing materials to enhance wear resistance, although reducing wear to some extent, fails to solve the fundamental problem of chip buildup and significantly increases material costs.

[0008] Therefore, how to effectively improve chip removal efficiency and reduce wear on secondary cutting edges has become the technical problem to be solved by this utility model. Utility Model Content

[0009] The technical problem solved by this utility model is to address the deficiencies in the prior art by providing a cross-shaped drill bit with an alloy auxiliary cutting edge and optimized chip removal design, so as to solve the problems of poor chip removal leading to chip blockage and easy wear of the secondary cutting edge mentioned in the background art.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0011] A cross-shaped drill bit with alloy auxiliary cutting edge and chip removal optimization design includes a cross-shaped drill bit body, the cross-shaped drill bit body includes a cutting head, the cutting head includes a main cutting edge and a secondary cutting edge arranged perpendicular to the main cutting edge to form a cross shape;

[0012] The cross-shaped drill bit with alloy auxiliary cutting edge and optimized chip removal design also includes a chip removal notch, an arc-shaped surface, a first inclined surface, a second inclined surface, and a chip removal arc-shaped groove;

[0013] A chip removal notch is provided at the position where the upper surface of the secondary cutting edge connects with the main cutting edge. The chip removal notch includes a side close to the main cutting edge and a side away from the main cutting edge. The side of the chip removal notch away from the main cutting edge is an arc-shaped surface.

[0014] There are four chip removal spaces between the secondary cutting edge and the main cutting edge. Each chip removal space includes a first inclined plane and a second inclined plane. The inclination angles of the first inclined plane and the second inclined plane are different, so that there is an included angle of 130 degrees to 175 degrees between the first inclined plane and the second inclined plane.

[0015] The cross-shaped drill bit body includes a shank, and the part of the shank near the drill bit has chip removal arc-shaped grooves arranged in the axial direction, the bottom of the arc-shaped grooves being connected to the second inclined surface.

[0016] As a further embodiment of this invention, the first inclined surface is set in close contact with the secondary cutting edge and the main cutting edge.

[0017] As a further embodiment of this invention, the width of the first inclined surface is smaller than the width of the second inclined surface.

[0018] As a further embodiment of this invention, the width of the second inclined surface is more than twice the width of the first inclined surface.

[0019] As a further embodiment of this invention, the secondary cutting edge is made of an alloy material.

[0020] As a further embodiment of this invention, the chip removal notch is located on the secondary cutting edge and close to the main cutting edge.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Significantly improved chip removal efficiency and reduced cutting blockage: By designing chip removal notches, arc-shaped surfaces, and first and second inclined planes, the chip removal path is greatly optimized. The inclined planes with different angles and the increased chip removal space allow chips to be removed quickly, avoiding chip accumulation and blockage that are prone to occur in traditional drills under high-load cutting, thereby significantly reducing frictional heat during machining and improving drilling efficiency.

[0023] 2. By designing a chip removal notch at the connection point between the secondary cutting edge and the primary cutting edge, and employing an arc-shaped surface structure on the side of the notch away from the primary cutting edge, chips are guided to quickly detach from the cutting area, preventing chip accumulation and wear on the secondary cutting edge. This design not only effectively reduces friction and stress concentration on the secondary cutting edge during the cutting process, greatly improving its wear resistance and service life, but also maintains stable cutting accuracy during drilling.

[0024] 3. A chip-removing arc-shaped groove is designed near the tool head on the tool holder, and it connects to the second inclined surface. This design not only optimizes the chip removal path, but more importantly, it reduces the stress and wear on the secondary cutting edge during cutting. Because the chip-removing arc-shaped groove can smoothly and quickly remove chips from the cutting area, it reduces chip accumulation and friction near the secondary cutting edge, making the stress on the secondary cutting edge more uniform during long-term, high-load cutting, thereby effectively extending the service life of the secondary cutting edge.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 paying any creative labor.

[0027] Figure 1 This is a schematic diagram of the structure of this utility model.

[0028] Figure 2 for Figure 1 A structural diagram from another perspective.

[0029] The reference numerals and names in the figure are as follows:

[0030] The cross-shaped drill bit consists of: 1. drill bit body; 2. main cutting edge; 3. secondary cutting edge; 4. chip removal notch; 5. arc-shaped surface; 6. first inclined surface; 7. second inclined surface; 8. chip removal arc-shaped groove; 9. and tool holder; and 10. Detailed Implementation

[0031] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] Please see Figure 1 —2, In this embodiment of the present invention, a cross-shaped drill bit with an alloy auxiliary cutting edge and chip removal optimization design includes a cross-shaped drill bit body 1, the cross-shaped drill bit body 1 includes a cutting head 2, the cutting head 2 includes a main cutting edge 3 and a secondary cutting edge 4 arranged perpendicularly to the main cutting edge 3 to form a cross shape;

[0033] The cross-shaped drill bit with alloy auxiliary cutting edge and optimized chip removal design also includes a chip removal notch 5, an arc-shaped surface 6, a first inclined surface 7, a second inclined surface 8, and a chip removal arc-shaped groove 9;

[0034] A chip removal notch 5 is provided at the position where the upper surface of the secondary cutting edge 4 connects with the main cutting edge 3. The chip removal notch 5 includes a side close to the main cutting edge 3 and a side away from the main cutting edge 3. The side of the chip removal notch 5 away from the main cutting edge 3 is an arc-shaped surface 6. There are four chip removal spaces between the secondary cutting edge 4 and the main cutting edge 3. The chip removal space includes a first inclined plane 7 and a second inclined plane 8. The inclination angles of the first inclined plane and the second inclined plane are different, so that there is an included angle of 130 degrees to 175 degrees between the first inclined plane and the second inclined plane.

[0035] The cross-shaped drill body 1 includes a shank 10. The shank 10, near the drill head 2, has axially arranged arc-shaped chip-removing grooves 9, the bottom of which connects to a second inclined surface. A first inclined surface is positioned close to the secondary cutting edge 4 and the primary cutting edge 3. The width of the first inclined surface is less than the width of the second inclined surface. The width of the second inclined surface is more than twice the width of the first inclined surface. The secondary cutting edge 4 is made of alloy material. A chip-removing notch 5 is located on the secondary cutting edge 4, close to the primary cutting edge 3.

[0036] Example 1:

[0037] This embodiment provides a cross-shaped drill bit for drilling cemented carbide materials. It incorporates innovative designs such as a chip removal notch 5, an arc-shaped surface 6, and first and second inclined surfaces 8, aiming to solve the problems of poor chip removal, high cutting resistance, and easy wear of the secondary cutting edge 4 in traditional drill bits under high-load machining scenarios. Its application scenario is as follows: when machining cemented carbide materials, the amount of chips is large and the drill bit is subjected to high forces. Traditional drill bits often experience temperature increases due to poor chip removal, which accelerates tool wear and reduces machining accuracy and efficiency.

[0038] In practical operation, the cross-shaped drill bit of this invention is used for drilling cemented carbide plates. Traditional chip evacuation grooves, due to their unreasonable width and angle, tend to accumulate chips near the drill bit's cutting edge, especially in the area of ​​the secondary cutting edge 4, causing the secondary cutting edge 4 to bear greater stress and wear during machining. This invention addresses this by designing a chip evacuation notch 5 at the connection point between the secondary cutting edge 4 and the main cutting edge 3, and by providing an arc-shaped surface 6 on the side of the notch away from the main cutting edge 3. This arc-shaped surface 6 effectively guides chips away from the cutting area of ​​the secondary cutting edge 4, allowing the chips to exit through a smooth path.

[0039] In practical use, the large amount of chips generated by the drill bit during the cutting of cemented carbide materials are quickly guided from the drill bit surface to the chip removal arc groove 9 through the chip removal space formed by the different angles of the first inclined surface 7 and the second inclined surface 8, and then smoothly discharged along the direction of the tool holder 10 through the arc groove. Compared with the traditional design, due to the optimization of the chip removal channel, the chips no longer linger near the secondary cutting edge 4, effectively avoiding machining stoppages and tool wear caused by chip blockage.

[0040] During machining, the cross-cutting design of the secondary cutting edge 4 and the main cutting edge 3 ensures a uniform distribution of cutting force. Because the secondary cutting edge 4 is made of a highly wear-resistant alloy material, and combined with the arc-shaped surface 6 of the chip removal notch 5 to guide chips away from the cutting area, the wear of the secondary cutting edge 4 under prolonged high-load cutting is significantly reduced, thus extending the tool's service life. Compared with existing technologies, under the same machining conditions, the cross-shaped drill bit of this invention can complete continuous machining for a longer period without frequent tool changes, reducing downtime and improving production efficiency.

[0041] Furthermore, the drill bit of this invention exhibits excellent cutting stability when drilling high-hardness materials. Due to the smoothness of the chip removal channel and the reduction in cutting resistance, frictional heat during machining is significantly reduced, and tool temperature is effectively controlled, thereby further delaying tool wear. After machining, the surface finish of the workpiece hole is significantly improved, and drilling accuracy is guaranteed. This unexpected technical effect is particularly suitable for machining hard materials with high strength and high precision requirements.

[0042] In summary, this embodiment, through the innovative design of the chip removal notch 5, the arc-shaped surface 6, and the chip removal arc-shaped groove 9, successfully solves the problems of poor chip removal, high cutting resistance, and easy tool wear of traditional drill bits under high load machining, significantly improving machining efficiency, drilling accuracy, and tool life.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A cross-shaped drill bit with an alloy auxiliary cutting edge and optimized chip removal design, comprising a cross-shaped drill bit body, the cross-shaped drill bit body including a cutting head, the cutting head including a main cutting edge and a secondary cutting edge arranged perpendicular to the main cutting edge to form a cross shape, characterized in that: The cross-shaped drill bit with alloy auxiliary cutting edge and optimized chip removal design also includes a chip removal notch, an arc-shaped surface, a first inclined surface, a second inclined surface, and a chip removal arc-shaped groove; A chip removal notch is provided at the position where the upper surface of the secondary cutting edge connects with the main cutting edge. The chip removal notch includes a side close to the main cutting edge and a side away from the main cutting edge. The side of the chip removal notch away from the main cutting edge is an arc-shaped surface. There are four chip removal spaces between the secondary cutting edge and the main cutting edge. Each chip removal space includes a first inclined plane and a second inclined plane. The inclination angles of the first inclined plane and the second inclined plane are different, so that there is an included angle of 130 degrees to 175 degrees between the first inclined plane and the second inclined plane. The cross-shaped drill bit body includes a shank, and the part of the shank near the drill bit has chip removal arc-shaped grooves arranged in the axial direction, the bottom of the arc-shaped grooves being connected to the second inclined surface.

2. A cross-shaped drill bit with alloy auxiliary cutting edge and optimized chip removal design according to claim 1, characterized in that, The first inclined plane is set close to the secondary cutting edge and the primary cutting edge.

3. A cross-shaped drill bit with alloy auxiliary cutting edge and optimized chip removal design according to claim 1, characterized in that, The width of the first inclined plane is less than the width of the second inclined plane.

4. A cross-shaped drill bit with alloy auxiliary cutting edge and optimized chip removal design according to claim 1, characterized in that, The width of the second inclined plane is more than twice the width of the first inclined plane.

5. A cross-shaped drill bit with alloy auxiliary cutting edge and optimized chip removal design according to claim 1, characterized in that, The secondary cutting edge is made of alloy material.

6. A cross-shaped drill bit with alloy auxiliary cutting edge and optimized chip removal design according to claim 1, characterized in that, The chip removal notch is located on the secondary cutting edge and close to the primary cutting edge.

Images