A new drill bit

Abstract

The utility model provides a novel drill bit relates to hardware product technical field, including the drill bit department of front end and the connecting portion of rear end, the drill bit department surface is equipped with at least two symmetrical distribution's spiral chip flute, the diameter of connecting portion is less than the diameter of drill bit department, forms the stepped chip removal channel, be equipped with the transition connecting section between drill bit department and connecting portion, the transition connecting section outer wall is tapering contraction structure, the tail of spiral chip flute extends to the transition connecting section, and forms the guide inclined plane that inclines to the upward in the terminal, the guide inclined plane from the end of chip flute starts with 5 to 18's angle of inclination to the drill bit periphery extension, and penetrates the transition connecting section until the connecting portion outer surface, constitutes the flow path of the fragment outward projection. The utility model has the advantages that the surface of cutting cone body is provided with the alloy layer, the setting of alloy layer makes the drill bit strength big, can hit the wall, also can hit the iron, the internal thread of connecting portion tail end, help to connect the conversion head or the extension rod.

Description

Technical Field

[0001] This utility model relates to the field of hardware product technology, and in particular to a novel drill bit. Background Technology

[0002] Drill bits are cutting tools used to drill through holes or blind holes in solid materials. They are widely used in many fields such as industrial manufacturing, construction, and daily life. Currently, commonly used drill bit types include twist drills, flat drills, center drills, deep hole drills, and nesting drills. The working principle of drill bits is based on mechanics and thermodynamics. By rotating, centrifugal force and shear stress are generated to cut the object. At the same time, the frictional heat generated during cutting softens the metal surface of the object, making it easier to cut.

[0003] Chinese Patent Publication No. CN216782166U discloses a three-groove support screw drill that facilitates chip removal. Its main technical solution and beneficial effects are as follows: It includes an integrally formed drill body and drill shank. The drill body has three evenly distributed spiral grooves, and one end of the drill body is provided with a conical screw tip. The other end of the drill body is provided with a drill shank. The drill shank includes a chip removal shank near the drill body and a fixed shank away from the drill body. The chip removal shank and the fixed shank are arranged concentrically, and the diameter of the chip removal shank is smaller than the diameter of the fixed shank. This allows wood chips to still be discharged from around the chip removal shank during processing. As long as the fixed shank does not embed itself in the wood, it can continue to work without stopping to empty the wood chips, thus improving the working efficiency of the support screw drill.

[0004] However, simply setting the diameter of the discharge shank to be smaller than that of the fixed shank to provide discharge space for wood chips is far from meeting the actual requirements for efficient and smooth chip discharge. In actual wood chip discharge, due to the lack of an effective guiding structure, the wood chips will be discharged in a disorderly and chaotic manner. This not only leads to insufficient wood chip discharge, easily causing accumulation and blockage in the discharge channel, but also increases the resistance to chip discharge and reduces discharge efficiency. If the wood chip accumulation becomes severe, it may even affect the normal operation of the drill bit, resulting in a significant drop in work efficiency. In other words, there is still room for improvement in the existing technology. Utility Model Content

[0005] This invention overcomes the shortcomings of existing technologies and provides a novel drill bit with good chip removal and cooling function.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] A novel drill bit includes a drill head at the front end and a connecting part at the rear end. The surface of the drill head is provided with at least two symmetrically distributed spiral chip removal grooves. The diameter of the connecting part is smaller than the diameter of the drill head, forming a stepped chip removal channel.

[0008] A transition connecting section is provided between the drill bit and the connecting part. The outer wall of the transition connecting section has a tapered contraction structure, and the angle between its generatrix and the drill bit axis is 15° to 25°.

[0009] The tail of the spiral chip removal groove extends to the transition connection section and forms an upwardly inclined guide slope at the end. The guide slope extends from the tail end of the chip removal groove toward the outer periphery of the drill bit at an angle of 5° to 18° and penetrates the transition connection section to the outer surface of the connection part, forming a guide path for the outward ejection of chips.

[0010] Furthermore, the drill bit includes an integrally formed cylindrical chip removal section and a cutting cone. The front end of the cutting cone has a downwardly inclined main cutting surface, and the angle between the main cutting surface and the drill bit axis is 52° to 58°. An alloy layer is inlaid on the surface of the cutting cone.

[0011] Furthermore, the cutting cone has a maximum diameter at a position 2 to 3 mm from the drill tip, which is larger than the diameter of the cylindrical chip removal section.

[0012] Furthermore, the connecting part is provided with a coolant conduit, which extends along the drill bit axis and runs through the entire transition connecting section, with its outlet end extending to the front end of the cylindrical chip removal section; the cylindrical chip removal section is provided with a radial injection hole communicating with the coolant conduit, and the angle between the axis of the injection hole and the axis of the drill bit is 30° to 45°.

[0013] Furthermore, the tail end of the connecting part is machined with a hollow assembly cavity, which is a cylindrical blind hole structure with a depth of 40% to 60% of the length of the connecting part; the inner wall of the hollow assembly cavity is machined with internal threads, which facilitates the connection of the adapter or extension rod.

[0014] Furthermore, a titanium alloy reinforcing ring is fitted onto the outer wall of the connecting part, and the inner wall of the reinforcing ring and the connecting part are fitted with an interference fit.

[0015] Furthermore, a hard alloy layer is provided on the guide slope.

[0016] Furthermore, the helix angle of the spiral chip removal groove is 28° to 35°.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The tapered contraction structure and guiding slope of the transition connection section of this utility model allow chips to be smoothly guided from the drill bit to the connection part and discharged through the stepped chip removal channel. At the same time, coolant is delivered to the injection hole through the coolant conduit to cool and lubricate the drill bit and the workpiece, achieving a good cooling effect and improving the working efficiency and service life of the drill bit. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments of the present invention, are used to explain the present invention. They do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This utility model describes a three-dimensional representation of a novel drill bit. Figure 1 ;

[0021] Figure 2 This is a front view of a novel drill bit according to this utility model;

[0022] Figure 3 This utility model describes a three-dimensional representation of a novel drill bit. Figure 2 ;

[0023] In the figure: 1. Drill head; 101. Spiral chip removal groove; 102. Cylindrical chip removal section; 103. Cutting cone; 1031. Main cutting slope; 2. Connecting part; 201. Cylindrical blind hole structure; 3. Transition connecting section; 4. Guide slope. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0025] Example 1

[0026] like Figures 1 to 3 As shown, this utility model claims protection for a novel drill bit, including a drill head 1 and a connecting part 2 that are integrally connected. The drill head 1 includes an integrally formed cylindrical chip removal section 102 and a cutting cone 103. The front end of the cutting cone 103 forms a downwardly inclined main cutting surface 1031. The angle between the main cutting surface 1031 and the drill bit axis is 52° to 58°. In this embodiment, the angle is preferably 55°. This angle helps the drill bit to cut into the workpiece more effectively during the cutting process and improves the cutting efficiency.

[0027] Furthermore, the cutting cone 103 has its maximum diameter at a position 2 to 3 mm from the drill tip, which is larger than the diameter of the cylindrical chip removal section 102. In this embodiment, the maximum diameter is located at a position 2.5 mm from the drill tip. This design allows the cutting cone 103 to generate a larger cutting force during cutting. In addition, the surface of the cutting cone 103 is inlaid with an alloy layer, which makes the drill bit strong and capable of drilling into walls or metal.

[0028] The surface of the drill bit 1 is provided with at least two symmetrically distributed spiral chip removal grooves 101. In this embodiment, two symmetrical spiral chip removal grooves 101 are provided. The spiral helix angle of the spiral chip removal grooves 101 is 28° to 35°. In this embodiment, it is preferably 32°. This spiral helix angle can make the chips smoothly discharged in the chip removal grooves and reduce the possibility of blockage.

[0029] The diameter of the connecting part 2 is smaller than that of the drill bit 1, forming a stepped chip removal channel to facilitate the discharge of chips from the drill bit 1 to the connecting part 2. A transition connecting section 3 is provided between the drill bit 1 and the connecting part 2. The outer wall of the transition connecting section 3 has a conical contraction structure, and the angle between its generatrix and the drill bit axis is 15° to 25°. In this embodiment, the angle is 20°. This conical contraction structure helps guide the flow of chips from the drill bit 1 to the connecting part 2. In addition, in order to enhance the smoothness of chip removal, the tail of the spiral chip removal groove 101 extends to the transition connecting section 3 and forms an upwardly inclined guide slope 4 at the end. The guide slope 4 extends from the tail end of the chip removal groove towards the outer periphery of the drill bit at an angle of 5° to 18° and penetrates the transition connecting section 3 to the outer surface of the connecting part 2. In this embodiment, the angle of the guide slope 4 is 12°, forming a guide path for the outward ejection of chips. A hard alloy layer is provided on the guide slope 4, which can improve the wear resistance of the guide slope 4 and ensure that the debris can be discharged smoothly.

[0030] from Figure 3 It can be seen that the tail end of the connecting part 2 is machined with a hollow assembly cavity. The hollow assembly cavity is a cylindrical blind hole structure 201, and its depth is 40% to 60% of the length of the connecting part 2. In this embodiment, the depth is 50% of the length of the connecting part 2. The inner wall of the hollow assembly cavity is machined with internal threads, which helps to connect the adapter or extension rod.

[0031] Example 2

[0032] The difference between Embodiment 2 and Embodiment 1 is that, based on Embodiment 1, the connecting part 2 is provided with a coolant conduit. The coolant conduit extends along the drill bit axis and passes through the entire transition connecting section 3, with its outlet end extending to the front end of the cylindrical chip removal section 102. The cylindrical chip removal section 102 is provided with a radial injection hole communicating with the coolant conduit. The angle between the axis of the injection hole and the axis of the drill bit is 30° to 45°. In this embodiment, the angle is 38°. The coolant is transported to the injection hole through the coolant conduit and sprayed onto the cutting area at a suitable angle, playing a role in cooling and lubrication, reducing the temperature of the drill bit, and extending the service life of the drill bit.

[0033] In addition, a titanium alloy reinforcing ring is fitted onto the outer wall of the connecting part 2. The inner wall of the reinforcing ring and the connecting part 2 are fitted with an interference fit. The titanium alloy reinforcing ring can enhance the strength and wear resistance of the connecting part 2 and improve the overall stability of the drill bit.

[0034] The working principle of this invention is as follows: When drilling is performed using this new type of drill bit, the main cutting slope 1031 of the cutting cone 103 first contacts the workpiece, cutting into it at a suitable angle. The generated chips move towards the transition connecting section 3 through the spiral chip removal groove 101 of the drill head 1. Due to the tapered contraction structure and the guiding slope 4 of the transition connecting section 3, the chips can be smoothly guided from the drill head 1 to the connecting part 2 and discharged through the stepped chip removal channel. At the same time, coolant is delivered to the spray hole through the coolant conduit to cool and lubricate the drill bit and the workpiece, achieving a good cooling effect and improving the working efficiency and service life of the drill bit.

[0035] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel drill bit, comprising a drill head at the front end and a connecting portion at the rear end, characterized in that: The drill bit surface is provided with at least two symmetrically distributed spiral chip removal grooves, and the diameter of the connecting part is smaller than the diameter of the drill bit, forming a stepped chip removal channel; a transition connecting section is provided between the drill bit and the connecting part, and the outer wall of the transition connecting section has a conical contraction structure, and the angle between its generatrix and the drill bit axis is 15° to 25°. The tail of the spiral chip removal groove extends to the transition connection section and forms an upwardly inclined guide slope at the end. The guide slope extends from the tail end of the chip removal groove toward the outer periphery of the drill bit at an angle of 5° to 18° and penetrates the transition connection section to the outer surface of the connection part, forming a guide path for the outward ejection of chips.

2. The novel drill bit according to claim 1, characterized in that: The drill bit includes an integrally formed cylindrical chip removal section and a cutting cone. The front end of the cutting cone has a downwardly inclined main cutting surface, and the angle between the main cutting surface and the drill bit axis is 52° to 58°. The surface of the cutting cone is provided with an alloy layer to enhance its strength.

3. The novel drill bit according to claim 2, characterized in that: The cutting cone has a maximum diameter at a distance of 2 to 3 mm from the drill tip, which is larger than the diameter of the cylindrical chip removal section.

4. The novel drill bit according to claim 1, characterized in that: The connecting part is provided with a coolant conduit, which extends along the drill bit axis and runs through the entire transition connecting section, with its outlet end extending to the front end of the cylindrical chip removal section; the cylindrical chip removal section is provided with a radial injection hole communicating with the coolant conduit, and the angle between the axis of the injection hole and the axis of the drill bit is 30° to 45°.

5. The novel drill bit according to any one of claims 1 to 4, characterized in that: The connecting part has a hollow assembly cavity machined at its tail end. The hollow assembly cavity is a cylindrical blind hole structure with a depth of 40% to 60% of the length of the connecting part. The inner wall of the hollow assembly cavity is machined with internal threads, which helps to connect the adapter or extension rod.

6. The novel drill bit according to claim 1, characterized in that: The outer wall of the connecting part is fitted with a titanium alloy reinforcing ring, and the inner wall of the reinforcing ring and the connecting part are interference fit.

7. The novel drill bit according to claim 1, characterized in that: A hard alloy layer is provided on the guide slope.

8. The novel drill bit according to claim 1, characterized in that: The helix angle of the spiral chip removal groove is 28° to 35°.

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