Multi-blade multi-face split drill

Abstract

The utility model discloses a multi-blade and multi-surface split drill. The drilling tool comprises a tool handle and a drilling body arranged at the front end of the tool handle, an integral main blade component is fixedly welded to the front end face of the drilling body and provided with a plurality of main blade blades, cutting blades protruding out of the front end faces of the main blade blades are arranged on the edges of the outer sides of the main blade blades, and a pyramid drill tip is formed in the center of each main blade blade. The pyramidal drill tip is provided with a cutting edge used for cutting materials and is provided with a central chip removal groove located between the adjacent main edge blades, and chips can be directly removed through the central chip removal groove while the materials are cut through the cutting edge. The drill tip has the advantages that the cutting edge on the conical surface is used for changing the traditional material removal by extruding a material through the conical surface into material removal by cutting, the material removal effect is improved, meanwhile, the central chip removal groove is ingeniously used for facilitating chip guide at the drill tip and rapid chip removal, the heat conduction condition of the drill tip is greatly improved, the drill tip is resistant to burning, and the service life of the drill tip is prolonged. Therefore, the durability is effectively improved.

Description

Technical Field

[0001] The utility model relates to a woodworking drill bit for drilling holes, in particular to a multi-blade and multi-faceted split drill. Background Art

[0002] A woodworking drill bit is a tool for drilling holes in wood. Conventional woodworking drill bits generally include a shank and a drilling body disposed at the front end of the shank, wherein the front end of the drilling body has a plurality of main cutting edges disposed integrally, a drill tip disposed at the center of each main cutting edge, and a scoring blade cooperating with the main cutting edge. When in use, the center tip of the main cutting edge is used for positioning, and the scoring blade is used to score the edge material on the circumference to form a cutting profile, and then the main cutting edge is used to cut and remove the material within the profile range, thereby forming the desired drill hole. However, due to the limitation of the existing integral structure, the main cutting edge and the scoring blade are both made of a single material, which not only makes the manufacturing cost high, but also causes the product use cost to be high due to its short life. In addition, the drill tip is always in a continuous high-intensity working environment and the working principle of the drill tip is mainly to remove the material by squeezing the material through the conical surface. Not only is the material removal effect poor, but the extruded material is easy to accumulate and difficult to discharge, which makes the drill tip easy to heat up, resulting in the drill tip being not resistant to burning and having poor durability. In addition, due to the unreasonable design of the drilling body structure, the material cutting performance is poor, and the front cutting face structure is unreasonable, and the sharpness is poor. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a multi-blade multi-faceted split drill with long service life, low manufacturing cost and use cost, good cutting performance and strong sharpness.

[0004] In order to solve the above technical problems, the multi-blade and multi-faceted split drill of the utility model comprises a shank and a drilling body arranged at the front end of the shank, an integral main blade component is welded and fixed on the front end face of the drilling body, the main blade component has a plurality of main blades and a scratching blade protruding from the front end face of the main blade is arranged on the outer edge of each main blade, a pyramid drill point is formed at the center of each main blade, the pyramid drill point has a cutting edge for cutting materials and is provided with a central chip groove located between adjacent main blades, and chips can be directly removed through the central chip groove while cutting materials through the cutting edge.

[0005] The drilling body has a conical outer surface contour structure and is provided with a spiral surface chip removal groove matched with each main edge blade.

[0006] The connecting part between the helical chip removal groove and each main cutting blade is provided with a helical rake surface, and the central chip removal groove and the helical chip removal groove are connected.

[0007] The front angle of the spiral front cutting surface tends to increase from the pyramid drill tip to the outside in the vertical plane.

[0008] The wing portion of each main cutting blade is provided with an arc-shaped main cutting edge.

[0009] The cutting blade comprises a cutting blade body, a cutting blade tip arranged on the cutting blade body and a cutting blade chamfer connected with the cutting blade tip. The cutting blade body is connected to the outer end edges of the two wings of each main blade.

[0010] The main blade has a main blade tip connected to the blade body, and the height of the blade tip is higher than that of the main blade tip.

[0011] The height of the scratching blade tip is higher than the height of the main blade tip by more than 0.2 cm.

[0012] The main blade component comprises three integrally formed main blades and a scoring blade integrally formed with the main blade, and the center of each main blade forms a triangular pyramid drill tip.

[0013] The advantages of the utility model are:

[0014] A pyramid drill tip is formed at the center of each main blade and the pyramid drill tip has a cutting edge for cutting materials, thereby changing the traditional material removal by squeezing the material through the cone surface to cutting and removing the material through the cutting edge on the cone surface, thereby improving the material removal effect. At the same time, through the central chip groove arranged between adjacent main blades, while the cutting edge cuts the material, the chips can also be directly removed through the central chip groove, thereby ingeniously utilizing the central chip groove to facilitate chip guidance at the drill tip and quickly remove chips, greatly improving the heat conduction condition of the drill tip, and the drill tip is resistant to burning, thereby effectively improving the durability; Furthermore, the connection between the center chip groove and the spiral chip groove further improves the chip removal effect, thereby greatly improving the drilling efficiency; furthermore, the arc-shaped main cutting edges arranged on the two wings of the main blade and the front angle of the spiral front cutting surface are set to increase from the pyramid drill tip to the outside in the vertical plane, thereby increasing the front angle in the horizontal plane, which is conducive to cutting, effectively improving the cutting strength, meeting the sharpness performance requirements, and further improving the drilling efficiency. In addition, the integral main blade component welded and fixed on the front end face of the drilling body avoids multi-piece welding, reduces processing time, and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the multi-edge multi-faceted split drill of the utility model. DETAILED DESCRIPTION

[0016] The multi-edged multi-faceted split drill of the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0017] As shown in the figure, the multi-edged multi-faceted split drill of the utility model comprises a shank 1 and a drilling body 2 arranged at the front end of the shank. It can be seen from the figure that the drilling body 2 has a conical outer surface contour structure and is provided with a spiral surface chip removal groove 9 on the drilling body 2. An integral main blade component 3 is welded and fixed on the front end surface of the drilling body 2. The main blade component 3 has a plurality of main blades 4 and a cutting blade 5 protruding from the front end surface of the main blade is provided on the outer edge of each main blade. The wing portion of each main blade 4 is provided with an arc-shaped main cutting edge 10. The arc-shaped main cutting edge increases the front angle in the horizontal plane, which is conducive to cutting. The center of each main blade 4 forms a pyramid drill tip 6. In the embodiment, the main edge component 3 has three main edge blades 4, that is, the main edge component 3 has three integrally formed main edge blades 4 and a cutting blade 5 integrally formed with the main edge blades. The center of each main edge blade forms a triangular pyramid drill tip. The spiral chip groove 9 cooperates with each main edge blade to facilitate chip guidance and rapid chip removal. The pyramid drill tip 6 has a cutting edge 7 for cutting materials and is provided with a center chip groove 8 located between adjacent main edge blades. The connecting part of the spiral chip groove 9 and each main edge blade 4 is provided with a spiral front cutting edge 14. The center chip groove 8 and the spiral chip groove 9 are connected, and chips can be directly removed through the center chip groove while cutting materials through the cutting edge.

[0018] Furthermore, the front angle of the spiral rake face 14 increases from the pyramid drill tip to the outside in the vertical plane, that is, the farther the spiral rake face is from the pyramid drill tip, the larger the front angle in the vertical plane is, and the sharper the cutting is.

[0019] Furthermore, the said cutting blade 5 comprises a cutting blade body, a cutting blade tip 11 arranged on the cutting blade body and a cutting blade chamfer 12 connected with the cutting blade tip. The setting of the cutting blade chamfer 12 not only increases the strength of the blade tip, makes the blade tip less prone to chipping, but also improves the heat conduction condition of the blade tip, makes the blade tip resistant to burning and improves the durability. The back surface is also increased after the cutting blade chamfer 12, reduces the wear of the blade tip by the rebound force of the cut material and improves the durability. The cutting blade body is connected to the outer end edge of the wing of each main blade, and the arc-shaped main cutting edge of the main blade has a main blade tip 13 connected with the cutting blade body. The height of the cutting blade tip 11 is high. The height of the main cutting edge 13 is above 0.2 cm, and in the present embodiment is 0.5 mm. Since the scratching blade tip 11 is 0.5 mm higher than the main cutting edge tip 13 of the arc-shaped main cutting edge, during processing, the scratching blade will contact the material before the arc-shaped main cutting edge, and cut the material in a circle, so that the material to be cut is first sheared and separated from the hole wall. The pressure cutting of the scratching blade prevents the hole mouth from producing upward and outward burrs, and then the arc-shaped main cutting edge digs out the waste material to form a hole. Because the scratching blade has a circular shearing effect on the material rather than a tearing and separating effect, the material is changed from being pulled apart in the direction of the aperture during separation, thereby reducing material tearing and separation burrs during the pulling apart process.

[0020] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A multi-edged multi-faceted split drill, comprising a shank (1) and a drilling body (2) arranged at the front end of the shank, characterized in that: An integral main blade component (3) is welded and fixed on the front end face of the drilling body (2), the main blade component (3) having a plurality of main blades (4) and a cutting blade (5) protruding from the front end face of the main blade is arranged on the outer edge of each main blade, the center of each main blade (4) forming a pyramid drill tip (6), the pyramid drill tip (6) having a cutting edge (7) for cutting material and being provided with a central chip removal groove (8) located between adjacent main blades, and chips can be directly removed through the central chip removal groove while cutting material through the cutting edge.

2. The multi-edged multi-faceted split drill according to claim 1, characterized in that: The drilling body (2) has a conical outer surface profile structure and is provided with a helical chip removal groove (9) that cooperates with each of the main cutting blades.

3. The multi-edged multi-faceted split drill according to claim 2, characterized in that: The connecting portion between the helical chip removal groove (9) and each of the main cutting blades (4) is provided with a helical rake face (14), and the central chip removal groove (8) and the helical chip removal groove (9) are connected.

4. The multi-edged multi-faceted split drill according to claim 3, characterized in that: The front angle of the spiral front cutting edge (14) tends to increase from the pyramid drill tip to the outside in a vertical plane.

5. The multi-edged multi-faceted split drill according to claim 1, 2, 3 or 4, characterized in that: The wing portion of each main cutting blade (4) is provided with an arc-shaped main cutting edge (10).

6. The multi-edged multi-faceted split drill according to claim 5, characterized in that: The cutting blade (5) comprises a cutting blade body, a cutting blade tip (11) arranged on the cutting blade body, and a cutting blade chamfer (12) connected to the cutting blade tip, wherein the cutting blade body is connected to the outer end edges of the two wings of each of the main blades.

7. The multi-edged multi-faceted split drill according to claim 6, characterized in that: The main blade has a main blade tip (13) connected to the blade body, and the height of the blade tip (11) is higher than the height of the main blade tip (13).

8. The multi-edged multi-faceted split drill according to claim 7, characterized in that: The height of the scratching blade tip (11) is greater than the height of the main blade tip (13) by more than 0.2 cm.

9. The multi-edged multi-faceted split drill according to claim 1, 2, 3, 4, 6, 7 or 8, characterized in that: The main blade component (3) comprises three integrally formed main blades (4) and a scratching blade (5) integrally formed with the main blade, and the center of each of the main blades forms a triangular pyramid drill tip.

Images