Four-blade centering drill

Abstract

The utility model relates to a four-blade centering drill which comprises a drill handle and a drill bit body connected to the front side of the drill handle. The drill bit body comprises two drill edges which are symmetrically distributed with the center line of the drill bit body as the central axis, the drill edges are spiral, one side of each drill edge is a main cutting edge, the other side of each drill edge is a groove back face, and the main cutting edge of one drill edge and the groove back face of the other drill edge are jointly matched to form a chip removal groove. The two groove back faces are further provided with auxiliary edge strips, and the two auxiliary edge strips and the two main cutting edges are jointly matched to form four edge strips. The side, away from the drill handle, of the drill bit body is a drill tip, and a small drill bit similar to a bullet is ground at the drill tip of the drill bit body. According to the four-edge centering drill, the small drill bit is ground at the drill point, the small drill bit is used for drilling firstly, a drilling point can be well positioned and drilled, reliable positioning is provided for subsequent drilling, and the small drill bit is fixed, so that the phenomenon that an original drill bit slips is avoided.

Description

Technical Field

[0001] This utility model relates to a drill bit, specifically a four-flute centering drill. Background Technology

[0002] Drill bits, as an important component of machining tools, are mainly used for roughing holes. Commonly used drill bits include twist drills, flat drills, and center drills. With the development of the machinery industry, users have placed higher demands on the machining quality, reliability, and efficiency of products. Twist drills, as the most widely used hole-machining tools, are tools that cut round holes in workpieces by rotating relative to a fixed axis. They are named for their spiral-shaped chip flutes, resembling a twisted rope.

[0003] Traditional twist drills mainly consist of a working part and a shank. The working part includes a twisted chip groove and a drill tip that has been normally ground. Because the cutting face of the drill tip is relatively large and the tip face is not fine, it has the following defects:

[0004] 1. This causes the drill tip to slip during drilling, resulting in inaccurate hole positioning. This is particularly detrimental to drilling operations, especially on cylindrical and inclined surfaces, where high precision in hole positioning is required.

[0005] 2. After processing, the area around the hole will have defects such as depressions and burrs, which will affect the appearance of the hole and make it elliptical or polygonal.

[0006] 3. When the through hole is almost drilled through, the drill bit is prone to getting stuck, making small-diameter drill bits easy to break.

[0007] 4. The burrs on the reverse side of the hole are severe, which is particularly prominent when processing difficult-to-machine materials such as stainless steel plates and nickel steel plates.

[0008] Therefore, when using ordinary twist drills to machine holes on thin plates, there are obvious shortcomings in terms of machining quality and ease of operation. Utility Model Content

[0009] The technical problem to be solved by this utility model is to provide a four-flute centering drill with high positioning accuracy and high drilling accuracy.

[0010] To solve the above-mentioned technical problems, the technical solution of this utility model is: a telescopic transport support beam, the innovation of which is: including a drill shank and a drill bit body connected to the front side of the drill shank;

[0011] The drill bit body includes two drill edges symmetrically distributed around the center line of the drill bit body. The drill edges are spiral-shaped, with one side of the drill edge being the main cutting edge and the other side being the back groove. The main cutting edge of one drill edge and the back groove of the other drill edge work together to form a chip removal groove.

[0012] The two grooves also have an auxiliary cutting edge on their back sides, and the two auxiliary cutting edges work together with the two main cutting edges to form four cutting edges.

[0013] The drill bit body has a drill tip on the side away from the drill shank, and a small drill bit shaped like a bullet is ground at the drill tip of the drill bit body. The two sides of the small drill bit are connected to each main cutting edge and the back of the groove, respectively.

[0014] Furthermore, the top surface of the drill bit is an inclined plane, with the horizontal plane where the connection between the small drill bit and the main cutting edge is located as the reference plane, and the inclined direction of the inclined plane is gradually inclined away from the reference plane from the end of the small drill bit to the end of the drill bit.

[0015] Furthermore, the cross-sectional profile of the chip removal groove is parabolic.

[0016] The advantages of this utility model are as follows: The four-flute centering drill of this utility model has a small drill bit ground at the drill tip. The small drill bit is used to drill first, which can effectively position and drill the point of drilling, providing reliable positioning for subsequent drilling. In addition, the small drill bit is fixed to avoid the phenomenon of the original drill bit slipping.

[0017] In addition, by adding an auxiliary cutting edge on the back of the groove, four cutting edges are formed together with the original main cutting edge. With this design, each drill bit has a double cutting edge for guidance, which can increase the moment of inertia of the drill bit, improve the rigidity and strength of the drill bit, improve the drilling dimensional accuracy, and have a good finishing effect on the hole wall, and remove burrs at the exit.

[0018] The parabolic design of the chip removal grooves further improves the rigidity of the drill bit and increases the chip capacity, which facilitates smooth chip removal and reduces clogging.

[0019] This invention's four-flute centering drill is particularly suitable for applications requiring high drilling positioning accuracy, especially for drilling on cylindrical and inclined surfaces. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the four-flute centering drill of this utility model.

[0021] Figure 2 This is a schematic diagram of the distribution of the cutting edge in this utility model. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0023] like Figure 1 , Figure 2 The four-flute centering drill shown includes a drill shank and a drill bit body connected to the front side of the drill shank.

[0024] The drill bit body includes two drill cutting edges 1 symmetrically distributed along the centerline of the drill bit body. The drill cutting edges 1 are helical, with one side being the main cutting edge 11 and the other side being the back groove 12. The main cutting edge 11 of one drill cutting edge 1 and the back groove 12 of the other drill cutting edge 1 work together to form a chip removal groove 2. The cross-sectional profile of the chip removal groove 2 is parabolic. This parabolic design of the chip removal groove 2 further improves the rigidity of the drill bit and increases the chip capacity, facilitating smooth chip removal and reducing clogging.

[0025] Each of the two groove back faces 12 also has an auxiliary cutting edge, and the two auxiliary cutting edges 11 work together to form four cutting edges. By adding auxiliary cutting edges on the groove back faces 12, which work together with the original main cutting edges 11 to form four cutting edges, each drill bit 1 has the guidance of a double cutting edge, which can increase the moment of inertia of the drill bit, improve the rigidity and strength of the drill bit, improve the drilling dimensional accuracy, and have a good finishing effect on the hole wall, smoothing burrs at the exit.

[0026] The drill tip is located on the side of the drill body furthest from the drill shank. A small drill bit 3, shaped like a bullet, is ground at the drill tip. The two sides of the small drill bit 3 are connected to the main cutting edges 11 and the back face of the groove 12, respectively. By grinding a small drill bit 3 at the drill tip, drilling can be performed first, which can effectively locate and drill the points to be drilled, providing reliable positioning for subsequent drilling. Furthermore, the small drill bit is fixed in place, preventing the original drill bit from slipping.

[0027] The top surface of drill bit 1 is an inclined plane, with the horizontal plane where the small drill bit 3 connects to the main cutting edge 11 as the reference plane. The inclined plane gradually slopes away from the reference plane from the end of the small drill bit 3 to the side away from the reference plane. This inclined plane design allows drill bit 1 to better cooperate with the small drill bit 3 to achieve positioning cutting of the hole.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A four-lip centering drill characterized by: The drill bit comprises a drill shank and a drill bit body connected to the front side of the drill shank. The drill bit body comprises two drill blades symmetrically distributed along the center line of the drill bit body, the drill blades are helical, one side of the drill blades is a main cutting edge, the other side is a groove back, and the main cutting edge of one of the drill blades cooperates with the groove back of the other drill blade to form a chip removal groove. The two groove backs are provided with an auxiliary blade strip, and the two auxiliary blade strips and the two main cutting edges cooperatively form four blade strips. The side of the drill bit body away from the drill shank is a drill tip, and a small drill bit shaped like a bullet is ground at the drill tip of the drill bit body, and the two sides of the small drill bit are connected to the main cutting edge and the groove back respectively.

2. The four-lip centering drill according to claim 1, characterized in that: The top surface of the drill blade is an inclined surface, the horizontal plane where the small drill bit and the main cutting edge are connected is a reference plane, and the inclined surface gradually inclines to the side away from the reference plane from the small drill bit to the end of the drill blade.

3. The four-lip centering drill according to claim 1, characterized in that: The cross-sectional profile of the chip removal groove is parabolic.

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