A double-ended spade drill tool

Abstract

This utility model discloses a double-ended shovel drill bit, including a tool shank and a shovel drill bit mounted on the tool shank. The shovel drill bit includes two pairs of cutting edges and a fixing part. The two pairs of cutting edges are symmetrically arranged with respect to the geometric center of the shovel drill bit body. Each pair of cutting edges is inclined outward at the intersection to form a drill tip. The fixing part includes a clamping surface provided on the upper and lower end faces of the shovel drill bit, and two screw holes perpendicularly penetrating the clamping surface. The clamping surface cooperates with the mounting seat of the tool shank. After the screws are inserted into the screw holes, they are fixed with the threaded holes provided on the tool shank. This utility model forms a double-ended cutting edge on the shovel drill bit, so that after one end is worn, the other end can be replaced for continued processing, which improves the material utilization rate and is more economical in operation compared with conventional shovel drill bits.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and more specifically, to a double-headed shovel drill tool. Background Technology

[0002] A shovel drill is a drilling tool consisting of a detachable tool holder and replaceable inserts. It is widely used in the field of machining. Existing shovel drills have a single-head design for the cutting edge, with only one pair of cutting edges. After the cutting edge wears out, new shovel drill inserts must be replaced to continue machining. Its single-head design results in low material utilization of the shovel drill insert body, and the cost of replacing the cutting head due to tool wear is also high.

[0003] Utility model patent CN205414511U discloses an improved shovel drill bit and a shovel drill with the shovel drill bit, belonging to the field of machining tool technology. The improved shovel drill bit includes a body, with a drill tip located in the middle at the upper end of the body and two cutting edges arranged on both sides of the drill tip. Each cutting edge is inclined downward relative to the drill tip. Each cutting edge includes a rake face, a flank face that intersects the rake face at an incline, and a cutting edge located on the side of the rake face away from the flank face. Each cutting edge is arranged on the same side as the flank face of the other cutting edge. The two sides of the body are vertically provided with cutting edges, and the two cutting edges are arranged opposite to the drill tip. The cutting edges are close to the cutting edges of the corresponding cutting edges. In the vertical direction, the axis of the cutting edges is parallel to the axis of the body in the vertical direction. The utility model has two cutting edges, which is a single-end design. After the cutting edge wears down, it is impossible to switch to the other cutting edge for machining operations, resulting in a large proportion of the tool cost in the machining process. Utility Model Content

[0004] This invention addresses the problem that existing single-headed shovel drills can only be used once, resulting in poor tool economy, by providing a double-headed shovel drill.

[0005] The technical solution adopted in this utility model is:

[0006] A double-ended shovel drill bit includes a shank and shovel drill bits mounted on the shank. The shovel drill bits include two pairs of cutting edges and a fixing part. The two pairs of cutting edges are symmetrically arranged with respect to the geometric center of the shovel drill bit body. Each pair of cutting edges is inclined outward at the intersection to form a drill tip. The fixing part includes a clamping surface provided on the upper and lower end faces of the shovel drill bit, and two screw holes perpendicularly penetrating the clamping surface. The clamping surface cooperates with the mounting seat of the shank. After the screws are inserted into the screw holes, they are fixed with the threaded holes provided on the shank.

[0007] Furthermore, the cutting edge includes a rake face and a flank face, and the rake face is provided with a chip removal groove.

[0008] Furthermore, the cutting edge is provided with chip-breaking grooves.

[0009] Furthermore, the cutting edge extends outward to the outer diameter contour edge of the entire tool to form a cutting edge extension, which is designed with a circular arc contour.

[0010] Furthermore, the drill bit is also provided with a cutting edge, which has a circular arc profile.

[0011] Furthermore, the cutting edge has a transverse cutting edge at the drill tip, which is the connection point of the two cutting edges and is S-shaped.

[0012] Furthermore, the mounting base is provided with a side mounting surface and an end mounting surface, the side mounting surface mates with the back blade surface, and the end mounting surface mates with the clamping surface.

[0013] Furthermore, the outer surface of the tool holder is provided with two helical grooves.

[0014] Furthermore, the tool holder is provided with an internal cooling water channel, one end of which is connected to the spindle water outlet, and the other end is provided with an outlet facing the drill bit.

[0015] Furthermore, the outer surface of the drill bit is coated with a wear-resistant coating.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The cutting edge of this utility model is provided in two pairs. The two pairs of cutting edges are symmetrically arranged with respect to the geometric center of the cutting edge body, thereby forming a double-headed cutting edge on the cutting edge. The cutting edge is then fixed by a fixing part, so that when one end of the tool is worn, the other end can be replaced for further processing, which improves the material utilization rate and is more economical in operation compared with conventional cutting edges. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a double-headed shovel drill tool;

[0019] Figure 2 A schematic diagram of the structure of a shovel drill bit;

[0020] Figure 3 This is a schematic diagram of a tool holder structure;

[0021] Figure 4 This is a partially enlarged schematic diagram of the mounting base end of a tool holder;

[0022] Figure 5 A schematic diagram of the structure after the mounting base and the drill bit are assembled;

[0023] Figure 6 This is a bottom view of a double-ended shovel drill tool.

[0024] The components are: 1. Tool holder; 11. Spiral groove; 12. Threaded hole; 13. Mounting base; 131. Side mounting surface; 132. End mounting surface; 14. Exit; 2. Drill insert; 21. Cutting edge; 211. Rake face; 212. Back face; 22. Chip removal groove; 23. Chip separating groove; 24. Screw hole; 25. Chisel edge; 26. Clamping surface; 27. Cutting edge band; 28. Cutting edge extension; 3. Screw. Detailed Implementation

[0025] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application; however, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," 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, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise explicitly specified and limited, "on" or "below" a second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0026] Example 1

[0027] like Figures 1 to 6As shown, this embodiment provides a double-ended shovel drill bit, including a tool holder 1 and a shovel drill bit 2 mounted on the tool holder 1. The outer surface of the shovel drill bit 2 is coated with a wear-resistant coating to improve the overall wear resistance of the tool. The shovel drill bit 2 includes two pairs of cutting edges 21 and a fixing part. The two pairs of cutting edges 21 are symmetrically arranged with respect to the geometric center of the shovel drill bit body. Each pair of cutting edges 21 is inclined outward at the intersection to form a drill tip, thereby forming a double-ended cutting edge on the shovel drill bit 2 for cutting operations. The fixing part includes a clamping surface 26 provided on the upper and lower end faces of the shovel drill bit, and two screw holes 24 perpendicularly penetrating the clamping surface. The clamping surface 26 cooperates with the mounting seat 13 of the tool holder. After the screw 3 is inserted into the screw hole 24, it is fixed with the threaded hole 12 provided on the tool holder 1.

[0028] The outer surface of the tool holder 1 is provided with two spiral grooves 11, which guide and discharge the waste chips produced by the drill bit 2. The mounting base 13 is provided with a side mounting surface 131 and an end mounting surface 132. The side mounting surface 131 cooperates with the back face 212, and the end mounting surface 132 cooperates with the clamping surface 26. After the drill bit 2 is assembled into the mounting base 13, the back face 212 fits into the side mounting surface 131 without gap, and the clamping surface 26 fits into the end mounting surface 132 without gap. The side mounting surface 131 and the end mounting surface 132 can ensure the accuracy of the installation position of the drill bit 2 and provide support for the drill bit 2. Then, the drill bit 2 is fixed by screws 3 to lock it onto the tool holder 1.

[0029] The cutting edge 21 includes a rake face 211 and a flank face 212. A chip removal groove 22 is provided on the rake face 211. The chip removal groove 22 is groove-shaped and applies bending stress to the chips, causing them to break during flow and preventing the formation of continuously entangled long chips. A chip breaking groove 23 is also provided on the cutting edge 21. Multiple chip breaking grooves 23 can be provided to reduce the chip width, thereby reducing cutting resistance and improving chip removal. A chisel edge 25 is provided at the drill tip of the cutting edge 21. The chisel edge 25 is the connection point of two cutting edges and is S-shaped. The chisel edge 25 provides a guiding function during drilling. The cutting edge 21 extends outward to the outer diameter contour edge of the tool to form a cutting edge extension 28. The cutting edge extension 28 is designed with a circular arc contour to improve the strength of the extension and prevent the extension from chipping during cutting.

[0030] This embodiment forms a double-ended cutting edge on the drill bit. After one end of the tool wears out, the other end can be replaced for continued processing, making it more economical in operation compared to conventional drill bits.

[0031] Example 2

[0032] like Figures 1 to 6As shown, this embodiment provides a double-ended shovel drill bit, including a tool holder 1 and a shovel drill bit 2 mounted on the tool holder 1. The outer surface of the shovel drill bit 2 is coated with a wear-resistant coating to improve the overall wear resistance of the tool. The shovel drill bit 2 includes two pairs of cutting edges 21 and a fixing part. The two pairs of cutting edges 21 are symmetrically arranged with respect to the geometric center of the shovel drill bit body. Each pair of cutting edges 21 is inclined outward at the intersection to form a drill tip, thereby forming a double-ended cutting edge on the shovel drill bit 2 for cutting operations. The fixing part includes a clamping surface 26 provided on the upper and lower end faces of the shovel drill bit, and two screw holes 24 perpendicularly penetrating the clamping surface. The clamping surface 26 cooperates with the mounting seat 13 of the tool holder. After the screw 3 is inserted into the screw hole 24, it is fixed with the threaded hole 12 provided on the tool holder 1.

[0033] The outer surface of the tool holder 1 is provided with two spiral grooves 11, which guide and discharge the waste chips produced by the drill bit 2. The mounting base 13 is provided with a side mounting surface 131 and an end mounting surface 132. The side mounting surface 131 cooperates with the back face 212, and the end mounting surface 132 cooperates with the clamping surface 26. After the drill bit 2 is assembled into the mounting base 13, the back face 212 fits into the side mounting surface 131 without gap, and the clamping surface 26 fits into the end mounting surface 132 without gap. The side mounting surface 131 and the end mounting surface 132 can ensure the accuracy of the installation position of the drill bit 2 and provide support for the drill bit 2. Then, the drill bit 2 is fixed by screws 3 to lock it onto the tool holder 1.

[0034] The cutting edge 21 includes a rake face 211 and a flank face 212. A chip removal groove 22 is provided on the rake face 211. The chip removal groove 22 is groove-shaped and applies bending stress to the chips, causing them to break during flow and preventing the formation of continuously entangled long chips. A chip breaking groove 23 is also provided on the cutting edge 21. Multiple chip breaking grooves 23 can be provided to reduce the chip width, thereby reducing cutting resistance and improving chip removal. A chisel edge 25 is provided at the drill tip of the cutting edge 21. The chisel edge 25 is the connection point of two cutting edges and is S-shaped. The chisel edge 25 provides a guiding function during drilling. The cutting edge 21 extends outward to the outer diameter contour edge of the tool to form a cutting edge extension 28. The cutting edge extension 28 is designed with a circular arc contour to improve the strength of the extension and prevent the extension from chipping during cutting.

[0035] Furthermore, the drill bit 2 is also provided with a cutting edge 27, which is located on the side of the drill bit and is arc-shaped, in order to ensure better hole position accuracy.

[0036] This embodiment forms a double-ended cutting edge on the drill bit. After one end of the tool wears out, the other end can be replaced for continued processing, making it more economical in operation compared to conventional drill bits.

[0037] Example 3

[0038] like Figures 1 to 6 As shown, this embodiment provides a double-ended shovel drill bit, including a tool holder 1 and a shovel drill bit 2 mounted on the tool holder 1. The outer surface of the shovel drill bit 2 is coated with a wear-resistant coating to improve the overall wear resistance of the tool. The shovel drill bit 2 includes two pairs of cutting edges 21 and a fixing part. The two pairs of cutting edges 21 are symmetrically arranged with respect to the geometric center of the shovel drill bit body. Each pair of cutting edges 21 is inclined outward at the intersection to form a drill tip, thereby forming a double-ended cutting edge on the shovel drill bit 2 for cutting operations. The fixing part includes a clamping surface 26 provided on the upper and lower end faces of the shovel drill bit, and two screw holes 24 perpendicularly penetrating the clamping surface. The clamping surface 26 cooperates with the mounting seat 13 of the tool holder. After the screw 3 is inserted into the screw hole 24, it is fixed with the threaded hole 12 provided on the tool holder 1.

[0039] The outer surface of the tool holder 1 is provided with two spiral grooves 11, which guide and discharge the waste chips produced by the drill bit 2. The mounting base 13 is provided with a side mounting surface 131 and an end mounting surface 132. The side mounting surface 131 cooperates with the back face 212, and the end mounting surface 132 cooperates with the clamping surface 26. After the drill bit 2 is assembled into the mounting base 13, the back face 212 fits into the side mounting surface 131 without gap, and the clamping surface 26 fits into the end mounting surface 132 without gap. The side mounting surface 131 and the end mounting surface 132 can ensure the accuracy of the installation position of the drill bit 2 and provide support for the drill bit 2. Then, the drill bit 2 is fixed by screws 3 to lock it onto the tool holder 1.

[0040] The cutting edge 21 includes a rake face 211 and a flank face 212. A chip removal groove 22 is provided on the rake face 211. The chip removal groove 22 is groove-shaped and applies bending stress to the chips, causing them to break during flow and preventing the formation of continuously entangled long chips. A chip breaking groove 23 is also provided on the cutting edge 21. Multiple chip breaking grooves 23 can be provided to reduce the chip width, thereby reducing cutting resistance and improving chip removal. A chisel edge 25 is provided at the drill tip of the cutting edge 21. The chisel edge 25 is the connection point of two cutting edges and is S-shaped. The chisel edge 25 provides a guiding function during drilling. The cutting edge 21 extends outward to the outer diameter contour edge of the tool to form a cutting edge extension 28. The cutting edge extension 28 is designed with a circular arc contour to improve the strength of the extension and prevent the extension from chipping during cutting.

[0041] Furthermore, the tool holder is provided with an internal cooling water channel. One end of the internal cooling water channel is connected to the spindle water outlet, and the other end is provided with an outlet 14. When the drill bit is performing drilling operations, the outlet 14 sprays coolant to cool the bit and avoids high temperature accelerating wear.

[0042] This embodiment forms a double-ended cutting edge on the drill bit. After one end of the tool wears out, the other end can be replaced for continued processing, making it more economical in operation compared to conventional drill bits.

[0043] 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 illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A double-ended shovel drill bit, comprising a shank and shovel drill blades mounted on the shank, characterized in that, The drill bit includes two pairs of cutting edges and a fixing part. The two pairs of cutting edges are symmetrically arranged with respect to the geometric center of the drill bit body. Each pair of cutting edges is inclined outward at the intersection to form a drill tip. The fixing part includes a clamping surface provided on the upper and lower end faces of the drill bit, and two screw holes that are perpendicular to the clamping surface. The clamping surface cooperates with the mounting seat of the tool holder. After the screw is inserted into the screw hole, it is fixed with the threaded hole provided on the tool holder.

2. A double-headed shovel drill tool according to claim 1, characterized in that, The cutting edge includes a rake face and a flank face, and the rake face is provided with a chip removal groove.

3. A double-headed shovel drill tool according to claim 1, characterized in that, The cutting edge is provided with chip-breaking grooves.

4. A double-ended shovel drill tool according to claim 1, characterized in that, The cutting edge extends outward to the outer diameter contour edge of the tool as a cutting edge extension, which is designed with a circular arc contour.

5. A double-ended shovel drill tool according to claim 1, characterized in that, The drill bit is also provided with a cutting edge, which has a circular arc profile.

6. A double-ended shovel drill tool according to claim 1, characterized in that, The cutting edge has a transverse cutting edge at the drill tip, which is the connection point of the two cutting edges and is S-shaped.

7. A double-ended shovel drill tool according to claim 1, characterized in that, The mounting base is provided with a side mounting surface and an end mounting surface. The side mounting surface mates with the rear blade surface, and the end mounting surface mates with the clamping surface.

8. A double-ended shovel drill tool according to claim 1, characterized in that, The outer surface of the tool holder is provided with two helical grooves.

9. A double-ended shovel drill tool according to claim 1, characterized in that, The tool holder is equipped with an internal cooling water channel. One end of the internal cooling water channel is connected to the spindle water outlet, and the other end is provided with an outlet facing the drill bit.

10. A double-ended shovel drill tool according to claim 1, characterized in that, The outer surface of the drill bit is coated with a wear-resistant coating.

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