Combined drill bit structure

Abstract

A combined type drill bit structure comprises a drill bit body and a blade part, a flat head part is arranged at the front end of the drill bit body, an inserting groove used for installing the blade part is formed in the front end of the head part, screw holes are formed in the surfaces of the two sides of the head part in a penetrating mode and communicated with the inserting groove, and notches are formed in the positions, located in the middles of the two sides of the inserting groove, of the front end of the head part. The edge part is a double-edge tool bit or a four-edge tool bit, one end of the double-edge tool bit or the four-edge tool bit is embedded into the insertion groove, one end of the double-edge tool bit and one end of the four-edge tool bit are both provided with through holes corresponding to the screw holes in a penetrating mode, and positioning bolts used for fixing the double-edge tool bit or the four-edge tool bit are arranged in the screw holes and the through holes in a penetrating mode; positioning protruding blocks are arranged on the surfaces of the two sides of the double-edge tool bit and embedded into the inserting grooves to achieve limiting. The auxiliary blades are arranged on the surfaces of the two sides of the four-blade tool bit, the rear ends of the auxiliary blades are embedded into the inserting grooves to achieve limiting, the drill bit blade portion is of a detachable structure, the drill bit is suitable for the double-blade or four-blade tool bit and can be used in different use environments, the blade heads can be replaced after tipping, and the use cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hole-opening tool technology, and in particular to a combined drill bit structure. Background Technology

[0002] Currently, there are many types of drill bits on the market, each used in different scenarios. Among them, double-flute and four-flute drilling bits differ significantly in structure, performance, and application. Double-flute drill bits have lower cutting resistance during drilling, resulting in relatively higher drilling efficiency and making them suitable for softer materials (such as wood, plastic, and thin metal sheets). However, when drilling hard materials (such as hard concrete), double-flute drills are prone to chipping. Four-flute drills, due to their multiple flutes distributing the cutting pressure, reduce chipping. Therefore, different drill bits are needed for different usage environments. However, replacing the entire drill bit is relatively expensive, and the fact that the cutting edge cannot be used after chipping further increases the cost of use. Utility Model Content

[0003] To address the aforementioned problems, this utility model discloses a modular drill bit structure. The drill bit cutting edge adopts a detachable structure and is suitable for replacing double-edged and four-edged blades to meet different usage environments.

[0004] The specific technical solution is as follows:

[0005] A combined drill bit structure includes a drill bit body and a cutting edge. The drill bit body has a flat head at its front end, with a slot for mounting the cutting edge at the front end of the head. Threaded holes are provided on both sides of the head, communicating with the slot. A notch is provided on both sides of the front end of the head at the center of the slot. The cutting edge is a double-edged or four-edged cutting edge. One end of the double-edged or four-edged cutting edge is embedded in the slot, and one end of both the double-edged and four-edged cutting edges has a through hole corresponding to the position of the threaded hole. Positioning bolts for fixing the double-edged or four-edged cutting edge are provided through the threaded hole and the through hole. The double-edged cutting edge has positioning protrusions on both sides of its surface that are adapted to the size of the slot, allowing the positioning protrusions to be embedded in the slot to limit the movement of the double-edged cutting edge. The four-edged cutting edge has secondary cutting edges on both sides of its surface, with the rear end of the secondary cutting edge embedded in the slot to limit the movement of the four-edged cutting edge.

[0006] Furthermore, the positioning bolt is threadedly connected to the screw hole, and both ends of the positioning bolt are flush with the two sides of the head.

[0007] Furthermore, the positioning bolt has a cylindrical structure, and one end of the positioning bolt is provided with a slot.

[0008] Furthermore, the two secondary blades on both sides of the four-bladed cutter head are perpendicular to the main blades at both ends of the four-bladed cutter head, so that the front end of the four-bladed cutter head has a cross-shaped structure.

[0009] Furthermore, the drill bit body surface is provided with two oppositely arranged chip removal grooves, and the front end positions of the two chip removal grooves correspond to the positions of the two sides of the head surface, respectively.

[0010] Furthermore, one end of both the double-edged and four-edged cutting heads is flat and adapted to the width of the slot.

[0011] The beneficial effects of this utility model are reflected in:

[0012] (1) The drill bit cutting edge of this utility model adopts a detachable structure, which can be used for double-edged or four-edged cutting heads, thus applying to different usage environments, and the cutting head can be replaced after chipping, thereby reducing the cost of use.

[0013] (2) When fixing, one end of the cutting edge is inserted into the slot, and the positioning protrusion of the double-edged cutting head or the rear end of the secondary cutting edge of the four-edged cutting head is inserted into the recess. Finally, the positioning bolt passes through the head and the cutting edge to achieve all-round fixing, realize a stable connection, and ensure the stability of drilling. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0015] Figure 2 This is an enlarged schematic diagram of the blade portion in Embodiment 1 of this utility model.

[0016] Figure 3 This is the front view of Embodiment 1 of this utility model.

[0017] Figure 4 This is a schematic diagram of the structure of the double-edged cutter head in Embodiment 1 of this utility model.

[0018] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0019] Figure 6 This is an enlarged schematic diagram of the blade in Embodiment 2 of this utility model.

[0020] Figure 7 This is the front view of Embodiment 2 of this utility model.

[0021] Figure 8 This is a schematic diagram of the structure of the four-bladed cutter head in Embodiment 2 of this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Drill body; 2. Head; 21. Slot; 22. Notch; 23. Screw hole; 24. Positioning bolt; 3. Chip removal groove; 4. Double-edged cutting head; 41. Positioning protrusion; 42. Through hole; 5. Four-edged cutting head; 51. Secondary cutting edge. Detailed Implementation

[0023] To make the technical solution of this utility model clearer and more explicit, the utility model will be further described below with reference to the accompanying drawings. Any solution derived by equivalent substitution and conventional reasoning of the technical features of this utility model falls within the protection scope of this utility model. The fixed connections and fixed settings mentioned in this utility model are all common connection methods in the mechanical field, including welding, bolt and nut connections, and screw connections.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0025] Example 1

[0026] Please see the appendix Figures 1-4 This embodiment provides a combined drill bit structure, including a drill bit body 1 and a cutting edge. The drill bit body 1 has a flat head 2 at its front end. The front end of the head 2 has a slot 21 for mounting the cutting edge, and screw holes 23 are provided through the two sides of the head 2. The screw holes 23 are all connected to the slot 21. The front end of the head 2 has a notch 22 at the middle of both sides of the slot 21. In this embodiment, the cutting edge is a double-edged cutting head 4. One end of the double-edged cutting head 4 is flat and adapted to the width of the slot 21. One end of the double-edged cutting head 4 is embedded in the slot 21, and one end of the double-edged cutting head 4 is provided with a through hole 42 corresponding to the position of the screw hole 23. The screw hole 23 and the through hole 42 are provided with positioning bolts 24 for fixing the double-edged cutting head 4. The two sides of the double-edged cutting head 4 are provided with positioning protrusions 41 adapted to the size of the slot 21, so that the positioning protrusions 41 are embedded in the slot 21 to limit the position of the double-edged cutting head 4.

[0027] In this embodiment, the positioning bolt 24 is threadedly connected to the screw hole 23, and both ends of the positioning bolt 24 are flush with the two sides of the head 2. The positioning bolt 24 has a cylindrical structure, and one end of the positioning bolt 24 is provided with a slot.

[0028] In this embodiment, the surface of the drill bit body 1 is provided with two oppositely arranged chip removal grooves 3, and the front end positions of the two chip removal grooves 3 correspond to the positions of the two sides of the head 2 respectively.

[0029] When installing the double-edged blade 4, one end of the double-edged blade 4 is inserted into the slot 21, and the positioning protrusion 41 is inserted into the recess 22. Finally, the positioning bolt 24 passes through the head 2 and the blade to achieve all-round fixation and a stable connection.

[0030] Example 2

[0031] Please see the appendix Figures 5-8 The difference between this embodiment and embodiment 1 is that the cutting edge is a four-bladed cutting head 5. One end of each of the four-bladed cutting heads 5 is flat and adapted to the width of the slot 21, so that one end of the four-bladed cutting head 5 is embedded in the slot 21. Each end of the four-bladed cutting head 5 is provided with a through hole 42 corresponding to the position of the screw hole 23. A positioning bolt 24 for fixing the four-bladed cutting head 5 is installed through the screw hole 23 and the through hole 42. The two sides of the four-bladed cutting head 5 are provided with secondary blades 51. The rear end of the secondary blades 51 is embedded in the slot 21 to limit the position of the four-bladed cutting head 5. The two secondary blades 51 on both sides of the four-bladed cutting head 5 are perpendicular to the main blades at both ends of the four-bladed cutting head 5 and protrude from the notch 22, so that the front end of the four-bladed cutting head 5 has a cross-shaped structure.

[0032] When installing the four-blade cutter head 5, one end of the four-blade cutter head 5 is inserted into the slot 21, and the rear end of the secondary blade 51 of the four-blade cutter head 5 is inserted into the recess 22. Finally, the positioning bolt 24 passes through the head 2 and the blade to achieve all-round fixation and realize a stable connection.

[0033] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A combined drill bit structure, characterized in that, The drill bit includes a drill body (1) and a cutting edge. The drill body (1) has a flat head (2) at its front end. The front end of the head (2) has a slot (21) for mounting the cutting edge. Threaded holes (23) are provided on both sides of the head (2), and the threaded holes (23) are connected to the slot (21). The front end of the head (2) has notches (22) at the center of both sides of the slot (21). The cutting edge is a double-edged cutting head (4) or a four-edged cutting head (5). One end of the double-edged cutting head (4) or the four-edged cutting head (5) is embedded in the slot (21), and one end of both the double-edged cutting head (4) and the four-edged cutting head (5) has a notch for mounting the cutting edge. A through hole (42) is provided corresponding to the position of the hole (23), and a positioning bolt (24) for fixing a double-edged cutter head (4) or a four-edged cutter head (5) is provided through the screw hole (23) and the through hole (42); wherein, the two sides of the double-edged cutter head (4) are provided with positioning protrusions (41) that are adapted to the size of the slot (21), so that the positioning protrusions (41) are embedded in the slot (21) to limit the double-edged cutter head (4); the two sides of the four-edged cutter head (5) are provided with secondary blades (51), and the rear end of the secondary blades (51) is embedded in the slot (21) to limit the four-edged cutter head (5).

2. The combined drill bit structure as described in claim 1, characterized in that, The positioning bolt (24) is threadedly connected to the screw hole (23), and both ends of the positioning bolt (24) are flush with the two sides of the head (2).

3. The combined drill bit structure as described in claim 2, characterized in that, The positioning bolt (24) has a cylindrical structure, and one end of the positioning bolt (24) is provided with a slot.

4. The combined drill bit structure as described in claim 1, characterized in that, The two secondary blades (51) of the four-bladed cutter head (5) are perpendicular to the main blades at both ends of the four-bladed cutter head (5), making the front end of the four-bladed cutter head (5) have a cross-shaped structure.

5. The combined drill bit structure as described in claim 1, characterized in that, The drill bit body (1) has two oppositely arranged chip removal grooves (3) on its surface, and the front end positions of the two chip removal grooves (3) correspond to the positions of the two sides of the head (2).

6. The combined drill bit structure as described in claim 1, characterized in that, Both the double-edged cutter head (4) and the four-edged cutter head (5) have a flat structure at one end, which is adapted to the width of the slot (21).

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