Woodworking auger bit

Abstract

The utility model relates to the technical field of wood punching tools, in particular to a woodworking auger bit. The woodworking auger bit comprises a handle body, a bit body and a threaded head which are integrally connected, a chip groove is formed in the side wall of the bit body, the groove face of the chip groove is a front cutter face, the end face of the bit body is a rear cutter face, the side wall face of the bit body is an auxiliary rear cutter face, a cutting part is arranged between the chip groove and the threaded head, and the cutting part comprises a main cutting edge, an auxiliary cutting edge and side wings. The main cutting edge is located at the intersecting line of the front tool face and the rear tool face, the auxiliary cutting edge is located at the intersecting line of the front tool face and the auxiliary rear tool face, the side wing is located at the intersecting line of the rear tool face and the auxiliary rear tool face, the side wing protrudes out of the rear tool face, and a first arc groove is formed in the front tool face and located between the main cutting edge and the auxiliary cutting edge. According to the woodworking auger bit, the smoothness of the end face of a drilled workpiece is guaranteed, burrs generated at a hole opening are reduced, and the drilling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wood punching tools, in particular to a woodworking drilling auger. Background Art

[0002] Compared with general twist drill bits, auger bits are usually provided with a threaded head and are a type of drill bit used for drilling holes in various types of wood. The threaded head is used to guide and drive the auger bit to drill toward the wooden board when its cutting edge does not contact the wooden board. Therefore, the auger bit is also called a self-threading drill. For example, Chinese patent document CN2339375Y discloses a auger bit. The auger bit is composed of a head, a drill body and a drill shank. The head includes a head outer circle, a countersunk cutting edge, a main cutting edge and a screw tip. Compared with twist drills and flat-wing drills, the auger bit has smooth chip removal and improved drilling efficiency.

[0003] The structure of most of the existing drill bits is similar to the structure of the above-mentioned drill bits. Although the existing drill bits have a certain drilling accuracy and ensure the smoothness of the hole wall, in the actual drilling process, the existing drill bits are difficult to ensure the end surface finish of the drilled workpiece. After the drilling is completed, there are a large number of burrs at the hole mouth, which greatly affects the drilling effect. In addition, the drill bits are subject to greater resistance during drilling, which can easily reduce the drilling efficiency. Especially in the process of batch continuous drilling operations, the drilling efficiency of the drill bits still needs to be further improved. Summary of the invention

[0004] The technical problem to be solved by the utility model is how to design a drill bit in the process of woodworking drilling to ensure the end surface finish of the drilled workpiece, reduce the burrs generated at the hole mouth, and improve the drilling efficiency.

[0005] In order to solve the above technical problems, the utility model proposes the following solutions:

[0006] A woodworking drill, comprising a handle, a drill body and a threaded head connected in one piece, a chip removal groove is arranged on the side wall of the drill body, the groove surface of the chip removal groove is a rake face, the end surface of the drill body is a flank face, and the side wall surface of the drill body is a secondary flank face;

[0007] A cutting portion is provided between the chip removal groove and the thread head;

[0008] The cutting portion comprises a main cutting edge, a secondary cutting edge and a side wing, wherein the main cutting edge is located at the intersection of the rake face and the flank face, the secondary cutting edge is located at the intersection of the rake face and the secondary flank face, the side wing is located at the intersection of the flank face and the secondary flank face, and the side wing protrudes from the flank face;

[0009] The front cutting edge is provided with a first circular arc groove, and the first circular arc groove is located between the main cutting edge and the secondary cutting edge.

[0010] When the woodworking drill proposed by the utility model is used to drill a wooden board, the handle body is installed in the electric tool, and the electric tool is used to provide drilling power to the drill body and the threaded head through the handle body. Before the side wing and the main cutting edge contact the wooden board, the threaded head guides and drives the drill body to drill into the wooden board. In the process of the drill body drilling into the wooden board, the side wing first contacts the drilling end face of the wooden board, which is equivalent to rough processing of the drilling end face, and then combined with the subsequent cutting action of the main cutting edge on the wooden board, secondary fine processing is formed on the drilling end face of the wooden board, which is beneficial to improving the smoothness of the drilling end face of the wooden board and greatly reducing the generation of burrs on the drilling end face. Under the drive of the electric tool, the main cutting edge, the auxiliary cutting edge and the side wing in the cutting part continuously cut the wooden board, and wood chips are discharged from the drill hole through the chip removal groove on the drill body. The first arc groove is used to reduce the angle between the main cutting edge and the processing surface of the wooden board, which is beneficial to increase the sharpness of the main cutting edge, reduce the resistance of the main cutting edge, and at the same time increase the chip removal space, thereby greatly improving the drilling efficiency.

[0011] Compared with the prior art, the woodworking support drill provided by the utility model has the following substantial characteristics and progress: the woodworking support drill adds side wings to the drill body, and during processing, the side wings are used to cut the drilling end face of the drilling workpiece before the main cutting edge. In one drilling process, secondary processing of the drilling end face is achieved, the end face smoothness of the drilling workpiece is ensured, and burrs generated at the hole mouth are greatly reduced. At the same time, by arranging a first arc groove between the main cutting edge and the secondary cutting edge, the sharpness of the main cutting edge is increased, and the drilling efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a woodworking drill bit in a first viewing angle according to an embodiment of the utility model.

[0013] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0014] Figure 3 It is a structural schematic diagram of a woodworking drill bit in a second viewing angle according to an embodiment of the utility model.

[0015] Figure 4 yes Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0016] Figure 5 It is a structural schematic diagram of a woodworking drill bit in an embodiment of the utility model at a third viewing angle.

[0017] Figure 6 yes Figure 5 Schematic diagram of the local enlarged structure at point C in the middle.

[0018] Figure numerals: 1. handle; 2. drill body; 3. threaded head; 4. chip groove; 5. cutting part; 6. front cutting edge; 7. back cutting edge; 8. secondary back cutting edge; 9. step; 10. annular groove; 51. main cutting edge; 52. secondary cutting edge; 53. flank; 54. first circular arc groove; 55. second circular arc groove; 56. chamfer; 57. fillet. DETAILED DESCRIPTION

[0019] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0020] like Figure 1-6 As shown, a woodworking drill bit is proposed in the embodiment of the utility model, which aims to ensure the end surface finish of the drilled workpiece, reduce burrs generated at the hole mouth, and improve drilling efficiency.

[0021] A woodworking drill provided in the embodiment of the utility model adds a side wing 53 to the drill body 2. During processing, the side wing 53 is used to cut the end face of the drilled workpiece before the main cutting edge 51. In one drilling process, secondary processing of the end face of the drilled workpiece is achieved, the end face finish of the drilled workpiece is ensured, and the burrs generated at the hole mouth are greatly reduced. At the same time, the woodworking drill increases the sharpness of the main cutting edge 51 by setting a first arc groove 54 between the main cutting edge 51 and the secondary cutting edge 52, thereby greatly improving the drilling efficiency.

[0022] like Figure 1 As shown, a woodworking drill comprises a handle 1, a drill body 2 and a threaded head 3 which are integrally connected. A chip groove 4 is provided on the side wall of the drill body 2. The groove surface of the chip groove 4 is a front cutting edge 6, the end surface of the drill body 2 is a back cutting edge 7, and the side wall surface of the drill body 2 is a secondary back cutting edge 8.

[0023] For example, the chip groove 4 is a double spiral groove. The double spiral groove is used to increase the chip removal volume of the drill body 2, which is conducive to deepening the chip groove 4, so that wood chips can be discharged more smoothly. The threaded head 3 is a conical head with an external thread, which is convenient for improving the guiding effect of the threaded head 3 on the drill body 2. The handle body 1, the drill body 2 and the threaded head 3 are made of high-alloy steel containing elements such as chromium, molybdenum, and vanadium. The hardness of the drill body 2 and the threaded head 3 is greater than or equal to 42HRC, and the hardness of the handle body 1 is greater than or equal to 36HRC.

[0024] like Figure 1 Combination Figure 2As shown, a cutting portion 5 is provided between the chip groove 4 and the thread head 3. The cutting portion 5 includes a main cutting edge 51, a secondary cutting edge 52 and a flank 53. The main cutting edge 51 is located at the intersection of the rake face 6 and the flank face 7. The secondary cutting edge 52 is located at the intersection of the rake face 6 and the secondary flank face 8. The flank 53 is located at the intersection formed by the flank face 7 and the secondary flank face 8. The flank 53 protrudes from the flank face 7. The flank 53 is used to first contact the drill end face of the wooden board during the process of the drill body 2 drilling into the wooden board, which is equivalent to rough processing of the drill end face, and then combined with the subsequent cutting action of the main cutting edge 51 on the wooden board, secondary finishing is formed on the drill end face of the wooden board, which is beneficial to improve the finish of the drill end face of the wooden board and greatly reduce the generation of burrs on the drill end face.

[0025] Among them, a first arc groove 54 is provided on the rake face 6. The first arc groove 54 is located between the main cutting edge 51 and the secondary cutting edge 52. The first arc groove 54 is used to reduce the angle between the main cutting edge 51 and the wood processing surface, which is beneficial to increase the sharpness of the main cutting edge 51, reduce the resistance of the main cutting edge 51, and increase the chip removal space, thereby greatly improving the drilling efficiency.

[0026] In order to further improve the cutting effect of the main cutting edge 51, as Figure 3 Combination Figure 4 As shown, a second arc groove 55 is provided on the flank 7. The second arc groove 55 is located between the flank 53 and the main cutting edge 51. The second arc groove 55 is used to further reduce the resistance of the main cutting edge 51, increase the sharpness of the main cutting edge 51 and increase the chip removal space.

[0027] like Figure 4 As shown, a chamfer 56 is provided on the flank 53, and the chamfer 56 is located on the side of the flank 53 away from the second arc groove 55. The chamfer 56 is used to reduce the contact surface of the flank 53 and reduce the resistance of the flank 53, thereby improving the sharpness of the flank 53 and further improving the cutting effect.

[0028] like Figure 5 Combination Figure 6 As shown, a fillet 57 is provided on the side wing 53. The fillet 57 is located on one side of the side wing 53 close to the second arc groove 55. The fillet 57 is used to form a smooth transition at the tip of the side wing 53, which is beneficial to avoid the tip of the side wing 53 from breaking during the machining and cutting process, thereby extending the service life of the side wing 53.

[0029] like Figure 5 As shown, the handle body 1 is in the shape of a hexagonal prism. An annular groove 10 is provided on the side wall of the hexagonal prism. The hexagonal prism-shaped handle body 1 facilitates center positioning and torque transmission during the clamping process. The annular groove 10 is used to axially position the handle body 1, which is conducive to the rapid clamping of the handle body 1 by the electric tool.

[0030] like Figure 6 As shown, a step 9 is provided on the side wall of the drill body 2. The step 9 is close to the end face of the drill body 2. The step 9 is used to reduce the friction between the drill body 2 and the workpiece to be drilled during the drilling process of the drill body 2, thereby further improving the drilling efficiency.

[0031] When a woodworking drill provided in the embodiment of the utility model is used, the handle body 1 is installed in an electric tool, and the electric tool is used to provide drilling power to the drill body 2 and the threaded head 3 through the handle body 1. Before the side wing 53 and the main cutting edge 51 contact the wooden board, the threaded head 3 guides and drives the drill body 2 to drill into the wooden board.

[0032] When the drill body 2 is drilling into the wooden board, the side wing 53 first contacts the drill hole end face of the wooden board, which is equivalent to rough processing of the drill hole end face. Combined with the subsequent cutting action of the main cutting edge 51 on the wooden board, secondary finishing is formed on the drill hole end face of the wooden board, which is beneficial to improve the smoothness of the drill hole end face of the wooden board and greatly reduces the generation of burrs on the drill hole end face.

[0033] Driven by the electric tool, the main cutting edge 51, the secondary cutting edge 52 and the side wing 53 in the cutting part 5 continuously cut the wood board, and wood chips are discharged from the drill hole through the chip removal groove 4 on the drill body 2. The first arc groove 54 is used to reduce the angle between the main cutting edge 51 and the processing surface of the wood board, which is conducive to increasing the sharpness of the main cutting edge 51, reducing the resistance of the main cutting edge 51, and increasing the chip removal space, thereby greatly improving the drilling efficiency.

[0034] In order to more intuitively reflect the performance improvement of the woodworking drill bit proposed in the embodiment of the utility model, a comparative experiment was conducted on the time required to complete the same drilling task between the woodworking drill bit and two other ordinary drill bits without side wings. Among them, the woodworking drill bit and the other two ordinary drill bits without side wings are driven by the same electric tool, and the drilling operation is performed on wooden boards of the same material. Each drill bit drills 100 through holes in the wooden boards, and the drilling time of each drill bit is recorded respectively. The test results are as follows: the average time for the woodworking drill bit to drill 100 times is 2.95s, and the average time for the other two ordinary drill bits to drill 100 times is 5.35s and 3.72s respectively.

[0035] It can be seen from the above test results that the woodworking drill proposed in the embodiment of the utility model has a higher drilling efficiency than the ordinary drill in the prior art. In addition, from the perspective of the flatness and finish of the holes: the drilling area of ​​the woodworking drill is relatively smooth, and almost no extra burrs are generated; from the perspective of drilling time and efficiency: there are certain differences in the extracted wood, which has a certain impact on the drilling time and speed. Ordinary drills have unstable drilling efficiency, while the drilling time and speed of the woodworking drill have been relatively stable; from the perspective of actual use experience: the vibration of ordinary models is relatively strong, manual drilling is relatively laborious, and the speed is slow, especially when drilling a through hole, a certain amount of force is required to push forward, while the woodworking drill has less vibration when drilling, does not require strong pushing, has a fast drilling speed, and a better experience.

Claims

1. A woodworking drill, comprising a handle, a drill body and a threaded head connected in one piece, a chip groove is provided on the side wall of the drill body, the groove surface of the chip groove is a rake face, the end surface of the drill body is a flank face, and the side wall surface of the drill body is a secondary flank face, characterized in that: A cutting portion is provided between the chip removal groove and the thread head; The cutting portion comprises a main cutting edge, a secondary cutting edge and a side wing, wherein the main cutting edge is located at the intersection of the rake face and the flank face, the secondary cutting edge is located at the intersection of the rake face and the secondary flank face, the side wing is located at the intersection of the flank face and the secondary flank face, and the side wing protrudes from the flank face; A first arc groove is arranged on the rake face, and the first arc groove is located between the main cutting edge and the secondary cutting edge; Wherein, a step is arranged on the side wall of the drill body, and the step is close to the end face of the drill body.

2. The woodworking drill bit according to claim 1, characterized in that: A second arc groove is arranged on the back cutting surface, and the second arc groove is located between the side wing and the main cutting edge.

3. The woodworking drill bit according to claim 2, characterized in that: The side wing is provided with a chamfer, and the chamfer is located on a side of the side wing away from the second arc groove.

4. The woodworking drill bit according to claim 2 or 3, characterized in that: The side wing is provided with a rounded corner, and the rounded corner is located on a side of the side wing close to the second arc groove.

5. The woodworking drill bit according to claim 1, characterized in that: The chip removal groove is a double spiral groove.

6. The woodworking drill bit according to claim 1, characterized in that: The threaded head is a conical head with external threads.

7. The woodworking drill bit according to claim 1, characterized in that: The handle body is in the shape of a hexagonal prism, and an annular groove is arranged on the side wall of the hexagonal prism.

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