Twist drill set

Abstract

The utility model relates to a twist set drill which comprises a drill rod and a drill bit body arranged at the front end of the drill rod. A main cutting edge is arranged at the top end of the drill bit body, a plurality of auxiliary cutting edges distributed in sequence are further arranged on the two sides of the outer wall of the drill bit body, each auxiliary cutting edge is jointly composed of two cutting bosses distributed on the two sides of the drill bit body, the cutting bosses extend out of the drill bit body, the main cutting edge is defined as a first-stage drill edge, and the second-stage drill edge is defined as a second-stage drill edge. The auxiliary cutting edges are a second-stage drill edge to an Nth-stage drill edge in sequence, N is an integer greater than or equal to 3, and the sizes of the first-stage drill edge, the second-stage drill edge to the Nth-stage drill edge are increased in sequence; spiral chip grooves are further formed in the two outer sides of the drill bit body respectively. According to the twist drill set, the mode that the main cutting edge is matched with the auxiliary cutting edge is adopted, so that multiple stages of drill edges are integrated on the same drill rod, a plurality of holes of different specifications can be drilled through the same twist drill set, the frequency of replacing a drill bit is reduced, and materials for manufacturing the drill bit are also saved.

Description

Technical Field

[0001] The utility model relates to a drill bit, in particular to a twist drill bit. Background Art

[0002] A twist drill is a tool that drills a circular hole in a workpiece by rotating it relative to a fixed axis. It is named because its chip groove is spiral and resembles a twist. The spiral groove can have 2, 3 or more grooves, but 2 grooves are the most common. Twist drills can be clamped on manual or electric handheld drilling tools or drilling machines, milling machines, lathes and even machining centers. The drill bit material is generally high-speed tool steel or carbide.

[0003] The twist drills commonly found on the market are usually of fixed sizes. When drilling holes, it is often necessary to drill holes of different diameters on the same work surface. The existing method is to select different numbers of twist drills according to the sizes of holes of different diameters, and then install different twist drills on the power tool to achieve the operation of drilling holes of different diameters. This processing method requires the twist drill to be constantly removed and installed from the power tool, which is very troublesome. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a twist drill which can conveniently perform drilling processing on holes with different apertures.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a twist drill, the innovation of which is: comprising a drill rod and a drill bit body arranged at the front end of the drill rod;

[0006] The top of the drill body has a main cutting edge, and the two sides of the outer wall of the drill body are also provided with a plurality of sub-cutting edges distributed in sequence, the sub-cutting edges are composed of two cutting bosses distributed on the two sides of the drill body, the cutting bosses extend out of the drill body, the main cutting edge is defined as a primary drill edge, and each sub-cutting edge is defined as a secondary drill edge...N-level drill edge in sequence, N is an integer ≥ 3, and the sizes of the primary drill edge, the secondary drill edge...N-level drill edge are increased in sequence;

[0007] A chip removal groove is respectively formed on the two outer side walls of the drill body, and the chip removal groove is spiral.

[0008] Furthermore, the drill bit body and the drill rod are connected by a split component, which is: a fixing groove is opened on the side of the drill bit body close to the drill rod, and a fixing shaft extending toward the drill bit body is provided on the side of the drill rod close to the drill bit body. The fixing shaft is fixed by a locking bolt after being embedded in the fixing groove, a through hole for accommodating the locking bolt to pass through is opened on the drill bit body, and a threaded blind hole matching the locking bolt is opened on the fixing shaft.

[0009] Furthermore, the fixing shaft is in a cross shape, and correspondingly, the fixing groove is also in a cross shape.

[0010] The advantages of the utility model are as follows: the twist drill in the utility model adopts the method of matching the main cutting edge with the auxiliary cutting edge, so that multi-level drill edges are integrated on the same drill rod, and a plurality of holes of different specifications can be drilled by the same twist drill, thereby reducing the frequency of replacing the drill bit and saving materials for manufacturing the drill bit.

[0011] The drill body and the drill rod are connected by a split component, realizing a split design between the drill body and the drill rod. Based on this design, if the multi-stage drill blades integrated on the same twist drill cannot meet the drilling requirements, the drill body can be directly replaced without removing the entire twist drill from the power tool and then installing it, which facilitates replacement.

[0012] The fixed shaft adopts a cross-shaped design, and is matched with a cross-shaped fixing groove, so that after the drill body and the drill rod are connected, the relative position between the drill body and the drill rod is relatively fixed to avoid relative rotation between the two, which would affect the smooth drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 It is a schematic diagram of the twist drill of the utility model.

[0015] Figure 2 It is a schematic diagram of the cooperation between the drill bit body and the drill rod in the utility model.

[0016] Figure 3 It is a schematic diagram of the fixed shaft in the utility model. DETAILED DESCRIPTION

[0017] The following embodiments may enable those skilled in the art to more fully understand the present invention, but the present invention is not limited to the scope of the embodiments.

[0018] like Figure 1-Figure 3 The twist drill shown comprises a drill rod 1 and a drill bit body 2 arranged at the front end of the drill rod.

[0019] A main cutting edge 4 is provided at the top of the drill body 2, and two secondary cutting edges are arranged on both sides of the outer wall of the drill body 2 and are distributed in sequence along the axial direction of the drill body 2. The secondary cutting edge is composed of two cutting bosses distributed on both sides of the drill body 2, and the cutting bosses extend out of the drill body 2. The main cutting edge 4 is defined as a primary drill edge, and the two secondary cutting edges are respectively a secondary drill edge 5 and a tertiary drill edge 6, and the sizes of the primary drill edge, the secondary drill edge 5, and the tertiary drill edge 6 increase in sequence.

[0020] The drill bit body 2 is connected to the drill rod 1 through a split assembly, such as Figure 2 As shown in the schematic diagram, the split assembly is as follows: a fixing groove 21 is provided on the side of the drill body 2 close to the drill rod 1, a fixing shaft 11 extending in the direction of the drill body 2 is provided on the side of the drill rod 1 close to the drill body 2, the fixing shaft 11 is fixed by a locking bolt after being inserted into the fixing groove 21, a through hole 22 for the locking bolt to pass through is provided on the drill body 2, the through hole 22 is connected to the fixing groove 21, and a threaded blind hole matching the locking bolt is provided on the fixing shaft 11. The drill body 2 and the drill rod 1 are connected by a split assembly, realizing a split design between the drill body 2 and the drill rod 1. Based on such a design, if the multi-stage drill blade integrated on the same twist drill set cannot meet the drilling requirements, a different drill body 2 can be directly replaced without removing the entire twist drill set from the power tool and then installing it, which is convenient for replacement.

[0021] like Figure 3 As shown in the schematic diagram, the fixed shaft 11 is in a cross shape, and correspondingly, the fixed groove 21 is also in a cross shape. The fixed shaft 11 is designed in a cross shape, and the cross-shaped fixed groove 21 is matched, so that after the drill body 2 and the drill rod 1 are docked, the relative position between the drill body 2 and the drill rod 1 is relatively fixed, so as to avoid relative rotation between the two, which affects the smooth progress of drilling.

[0022] A chip removal groove 3 is respectively formed on the two outer side walls of the drill body 2 . The chip removal grooves 3 are spirally distributed on the circumferential outer wall of the drill body 2 , and the two chip removal grooves 3 are symmetrically distributed.

[0023] The twist drill in the utility model adopts the method of matching the main cutting edge 4 with the auxiliary cutting edge, so as to integrate multiple drill edges on the same drill rod 1. Based on such a design, several commonly used drill bits of different specifications can be respectively integrated on the same drill rod 1 as the main cutting edge 4 and the auxiliary cutting edge. In this way, in the subsequent drilling process, the same twist drill can be used to complete the processing according to the requirements of hole diameters of different specifications, and there is no need to replace the drill bit, or only one or two drill bits need to be replaced to complete the processing of all holes of different specifications, which greatly reduces the frequency of replacing the drill bit. In addition, integrating multiple drill edges on the same drill rod 1 also saves materials for manufacturing the drill bit.

[0024] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A twist drill, characterized in that: It includes a drill rod and a drill bit body arranged at the front end of the drill rod; The top of the drill body has a main cutting edge, and the two sides of the outer wall of the drill body are also provided with a plurality of sub-cutting edges distributed in sequence, the sub-cutting edges are composed of two cutting bosses distributed on the two sides of the drill body, the cutting bosses extend out of the drill body, the main cutting edge is defined as a primary drill edge, and each sub-cutting edge is defined as a secondary drill edge...N-level drill edge in sequence, N is an integer ≥ 3, and the sizes of the primary drill edge, the secondary drill edge...N-level drill edge are increased in sequence; A chip removal groove is respectively formed on the two outer side walls of the drill body, and the chip removal groove is spiral.

2. The twist drill according to claim 1, characterized in that: The drill bit body and the drill rod are connected by a split component, which includes: a fixing groove is provided on the side of the drill bit body close to the drill rod, a fixing shaft is provided on the side of the drill rod close to the drill bit body and extends toward the drill bit body, the fixing shaft is fixed by a locking bolt after being embedded in the fixing groove, a through hole for the locking bolt to pass through is provided on the drill bit body, and a threaded blind hole matching the locking bolt is provided on the fixing shaft.

3. The twist drill according to claim 2, characterized in that: The fixing shaft is in a cross shape, and correspondingly, the fixing groove is also in a cross shape.

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