High-wear-resistance stepped drill

Abstract

The utility model discloses a high-wear-resistance stepped drill which comprises a drill rod part, a stepped drill part is arranged at the front end of the drill rod part, the stepped drill part is provided with a plurality of step parts used for drilling, the step parts are sequentially reduced forwards in the axial radial direction, tip parts with taper are formed at the front ends of the step parts, and spiral cutting grooves are formed in the stepped drill part; wherein transition journals are arranged between the adjacent step parts, the transition journals have inclination, and concave radians are formed between the front sides of the step parts and the transition journals; grooves with the width of 1.5 mm are formed in the outer walls of the middle sections of the step parts respectively, and diamond layers are brazed on the grooves. The stepped parts of the stepped drilling part are connected through the transition shaft necks, the drilling transitivity is improved, meanwhile, the narrow diamond layers are brazed on the outer walls of the stepped parts, the abrasion resistance of the outer surfaces of the stepped parts can be promoted, the roughness of hole walls is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of drills, and specifically relates to a high-wear-resistant stepped drill. Background Art

[0002] The stepped drill, also known as the step drill or pagoda drill, is mainly used for drilling thin steel plates within 3 mm. One drill bit can replace multiple drill bits. It can drill holes with different diameters as required and can complete the processing of large holes in one go without replacing the drill bit and punching positioning holes. However, the current stepped drills all have the usual step design, with a right-angle change between steps, resulting in a low feed efficiency. At the same time, because of the steps with continuously changing shaft diameters, the drill bit itself is prone to wear, and the drilled hole walls are relatively rough, so it needs to be improved. Content of the Utility Model

[0003] In view of this, the technical problem to be solved by the utility model is to provide a high-wear-resistant stepped drill to avoid the trouble of easy wear and poor wear resistance of the previous stepped drills.

[0004] To solve the above technical problem, the utility model discloses a high-wear-resistant stepped drill, including:

[0005] A drill rod part, with a stepped drill part arranged at the front end of the drill rod part. The stepped drill part has multiple step parts for drilling. The shaft diameters of the step parts decrease successively forward, and a tapered tip part is formed at the front end. The stepped drill part is provided with spiral cutting grooves;

[0006] Wherein, a transition shaft neck is arranged between adjacent step parts. The transition shaft neck has an inclination, and there is a concave arc between the front side of the step part and the transition shaft neck; 1.5-mm-wide grooves are respectively arranged on the outer walls of the middle sections of the step parts, and diamond layers are brazed on the grooves.

[0007] According to an embodiment of the utility model, the depth of the above groove is 0.5 - 1.5 mm.

[0008] According to an embodiment of the utility model, the above diamond layer is higher than the surface of the step part.

[0009] According to an embodiment of the utility model, the above drill rod part is arranged as a hexagonal shank.

[0010] Compared with the prior art, the utility model can obtain the following technical effects:

[0011] By connecting each step part of the stepped drill part through the transition shaft neck, the transition during drilling is improved. At the same time, a relatively narrow diamond layer is brazed on the outer wall of the step part, which can promote the wear resistance of its outer surface, reduce the roughness of the hole wall, and improve the service life.

[0012] Of course, when implementing any product of the present utility model, it is not necessarily required to achieve all the above-described technical effects simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0014] Figure 1 is a schematic view of a highly wear-resistant stepped drill according to an embodiment of the present utility model.

[0015] REFERENCE NUMERALS

[0016] drill rod part 10, stepped drill part 20, stepped part 30, tip part 40, spiral cutting groove 50, transition journal 60, diamond layer 70. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will describe in detail the embodiments of the present utility model in conjunction with the drawings and embodiments, so as to fully understand how the present utility model uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly.

[0018] Please refer to Figure 1 , Figure 1 is a schematic view of a highly wear-resistant stepped drill according to an embodiment of the present utility model.

[0019] As shown in the figure, a highly wear-resistant stepped drill includes: a drill rod part 10, a stepped drill part 20 is provided at the front end of the drill rod part 10, the stepped drill part 20 has a plurality of stepped parts 30 for drilling, the shaft diameters of the stepped parts 30 gradually decrease in the axial direction, and a tip part 40 with a taper is formed at the front end. The stepped drill part 30 is provided with a spiral cutting groove 50; wherein, a transition journal 60 is provided between adjacent stepped parts 30, the transition journal 60 has an inclination, and there is a concave arc between the front side of the stepped part 30 and the transition journal 60; grooves with a width of 1.5 mm are respectively provided on the outer walls of the middle sections of the stepped parts 30, and diamond layers 70 are brazed on the grooves.

[0020] In an embodiment of the present utility model, the drill rod part 10 is used to be assembled to the rear end of a power tool, and the front end is a stepped drill part 20, which is composed of stepped parts 30 with gradually changing shaft diameters, and a tip part 40 is formed at the front end vertex thereof for positioning and drilling operations. Two spiral cutting grooves 50 are provided, extending from the tip part 40 to the end of the stepped drill part 20 to achieve chip removal. The adjacent stepped parts 30 are connected by a transition journal 60, and the slope of the transition journal 60 is adjacent to the two, providing a transition slope. At the same time, the upper shaft diameter of the transition journal 60 is smaller than the shaft diameter of the previous stepped part 30, and there is a sufficient interval for cutting between the two. This interval has a concave arc, making the edge of the stepped part 30 sharper and more conducive to feeding.

[0021] In addition, a layer of diamond powder is brazed on the middle section of the stepped part 30 through a groove to form a highly wear-resistant diamond layer 70. On the one hand, it improves the wear resistance of the stepped part 30 itself and extends its service life. On the other hand, it can also reduce the roughness of the hole wall and improve the drilling accuracy.

[0022] In a preferred embodiment, the groove depth is 0.5 - 1.5 mm, the width is 1.5 mm, and diamond powder is filled by brazing. Further, the diamond layer 70 is higher than the surface of the stepped part 30 to fully grind the hole wall and facilitate enhancing wear resistance.

[0023] In addition, the drill rod part 10 is provided with a hexagonal handle, which is widely used.

[0024] In summary, the present utility model connects the stepped parts 30 of the stepped drill part 20 through the transition journal 60 to improve the transition during drilling. At the same time, a relatively narrow diamond layer 70 is brazed on the outer wall of the stepped part 30, which can promote the wear resistance of its outer surface, reduce the roughness of the hole wall, and extend the service life.

[0025] The above description shows and describes several preferred embodiments of the present utility model. However, as mentioned above, it should be understood that the present utility model is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the technology or knowledge in related fields. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present utility model shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. A high wear-resistant step drill, characterized in that, Including: A drill pipe section, a stepped drill section is provided at the front end of the drill pipe section. The stepped drill section has a plurality of stepped portions for drilling. The diameters of the stepped portions decrease sequentially in the axial direction, and a tapered tip portion is formed at the front end. The stepped drill section is provided with spiral cutting grooves; Wherein, a transition shaft neck is provided between adjacent stepped portions. The transition shaft neck has a slope, and there is a concave arc between the front side of the stepped portion and the transition shaft neck; Grooves with a width of 1.5 mm are respectively provided on the outer walls of the middle sections of the stepped portions, and diamond layers are brazed on the grooves.

2. The high-wear-resistant step drill according to claim 1, characterized in that, Wherein the depth of the groove is 0.5 - 1.5 mm.

3. The high wear-resistant step drill according to claim 1, characterized in that, Wherein the diamond layer is higher than the surface of the stepped portion.

4. The highly wear-resistant step drill according to claim 1, characterized in that, Wherein the drill pipe section is provided with a hexagonal handle.

Images