High-strength twist drill

Abstract

The utility model provides a high-strength twist drill which comprises a drill handle and a drill bit connected to the drill handle, the profile of the cross section of the drill handle is square, arc-shaped grooves are formed in the four side faces of the top end of the drill handle, and the arc-shaped grooves are connected end to end, so that a protruding plate is formed at the top of the drill handle. The high-strength twist drill is different from an existing twist drill, the existing twist drill is connected with driving equipment through clamping connection, a regular rectangular groove is formed in the top of a drill handle of the twist drill connected in a clamping mode and used for clamping, and in the twist drill, the rectangular groove in the prior art is changed into an arc-shaped groove; according to the drill handle with the square profile, the position, close to the top, of the drill handle still has a certain thickness, so that the situation of breakage in the working process is reduced, and the drill handle with the square profile is high in structural strength and not prone to breakage.

Description

Technical Field

[0001] The utility model belongs to the technical field of twist drills, and in particular relates to a high-strength twist drill. 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 looks like a twist. 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 is generally made of high-speed tool steel or carbide.

[0003] The twist drill will rotate at high speed during use and there will be strong friction between the twist drill and the object to be processed, which requires the twist drill to have high strength. Not only the twist drill bit itself needs to have high strength, but the drill handle part of the twist drill used to connect the driving equipment also needs to have high strength guarantee to meet the processing requirements. Utility Model Content

[0004] The main purpose of the utility model is to provide a high-strength twist drill, which improves the structural strength of the drill shank part of the twist drill by processing the drill shank part, thereby ensuring the structural stability of the twist drill.

[0005] To achieve the above purpose, the utility model provides a high-strength twist drill, which includes a drill shank and a drill bit connected to the drill shank. The cross-sectional profile of the drill shank is square, and the top of the drill shank is provided with arc grooves on four sides, and the arc grooves are connected end to end, so that a raised plate is formed on the top of the drill shank.

[0006] The high-strength twist drill provided by the utility model is different from the existing twist drills. The existing twist drills are usually connected to the driving device by clamping. The top of the drill shank of the twist drill with clamping connection is provided with a regular rectangular groove for clamping. In the present application, the rectangular groove in the prior art is changed to an arc groove, so that the drill shank still has a certain thickness near the top, thereby reducing the occurrence of breakage during operation, and the drill shank with a square profile has a high structural strength and is less likely to break.

[0007] In a possible implementation, a groove is further provided on the side of the drill shank, and the groove is connected to the bottom of the arc groove.

[0008] In a possible implementation, a cross reinforcement bar is disposed in the groove, and the cross reinforcement bar is inclined at 45°.

[0009] The side wall of the drill handle is provided with a groove, and an inclined cross reinforcement strip is provided in the groove, so that the drill handle can better cope with the stress generated during rotation, thereby improving the structural strength of the drill handle. Moreover, the cross reinforcement strip is provided in the groove and is obtained by processing on the original drill handle. The integrated structure is more stable and does not require an increase in material costs.

[0010] In a possible implementation, two sides of the cross reinforcement strip fit the side walls of the groove, and three cross reinforcement strips are arranged in each groove. Providing multiple cross reinforcement strips further improves the structural stability.

[0011] In a possible implementation, a cylindrical connecting rod is provided between the drill shank and the drill bit, and the diameter of the cylindrical connecting rod is smaller than the diameter of the inscribed circle of the drill shank. The cylindrical connecting rod is provided so that the main body of the twist drill exposed from the driving device is circular, which is relatively safer when used. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the structure of a high-strength twist drill. DETAILED DESCRIPTION

[0013] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0014] In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0015] In the description of this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0016] See attached figure Figure 1 , Figure 1 This is a schematic diagram of the structure of a high-strength twist drill provided by the utility model. Figure 1As shown, the utility model provides a high-strength twist drill comprising a drill shank 1 and a drill bit 2 connected to the drill shank 1. The cross-sectional profile of the drill shank 1 is a square. The top of the drill shank 1 is provided with arc grooves 3 on four sides. The arc grooves 3 are connected end to end, so that a raised plate 4 is formed on the top of the drill shank 1.

[0017] The high-strength twist drill provided by the utility model is different from the existing twist drills. The existing twist drills are usually connected to the driving device by clamping. The top of the twist drill shank 1 of the clamping connection is provided with a regular rectangular groove for clamping. In the present application, the rectangular groove in the prior art is changed to an arc groove 3, so that the drill shank 1 still has a certain thickness near the top, thereby reducing the occurrence of breakage during operation, and the drill shank 1 with a square profile has a high structural strength and is less likely to break.

[0018] In a possible implementation, a groove 5 is further provided on the side of the drill shank 1 , and the groove 5 is connected to the bottom of the arc groove 3 .

[0019] In a possible implementation, a cross reinforcement bar 6 is disposed in the groove 5 , and the cross reinforcement bar 6 is inclined at 45°.

[0020] A groove 5 is provided on the side wall of the drill shank 1, and an inclined cross reinforcement strip 6 is provided in the groove 5, so that the drill shank 1 can better cope with the stress generated during rotation, thereby improving the structural strength of the drill shank 1. The cross reinforcement strip 6 is provided in the groove 5 and is processed on the original drill shank 1, so the integrated structure is more stable and does not need to increase the material cost.

[0021] In a possible implementation, two sides of the cross reinforcement strip 6 are in contact with the side walls of the groove 5, and three cross reinforcement strips 6 are arranged in each groove 5. Providing multiple cross reinforcement strips 6 further improves the structural stability.

[0022] In a possible implementation, a cylindrical connecting rod 7 is provided between the drill shank 1 and the drill bit 2, and the diameter of the cylindrical connecting rod 7 is smaller than the diameter of the inscribed circle of the drill shank 1. The cylindrical connecting rod 7 is provided so that the main body of the twist drill exposed from the driving device is circular, which is relatively safer when used.

[0023] It is worth mentioning that for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A high-strength twist drill, characterized in that: The drill shank comprises a drill bit connected to the drill shank. The cross-sectional profile of the drill shank is a square. The top of the drill shank is provided with arc grooves on four sides. The arc grooves are connected end to end, so that a raised plate is formed on the top of the drill shank.

2. The high-strength twist drill according to claim 1, characterized in that: A groove is also provided on the side surface of the drill handle, and the groove is connected to the bottom of the arc groove.

3. The high-strength twist drill according to claim 2, characterized in that: A cross reinforcement strip is arranged in the groove, and the cross reinforcement strip is arranged at an angle of 45 degrees.

4. The high-strength twist drill according to claim 3, characterized in that: Two sides of the cross reinforcement strip fit the side walls of the groove, and three cross reinforcement strips are arranged in each groove.

5. The high-strength twist drill according to claim 4, characterized in that: A cylindrical connecting rod is arranged between the drill shank and the drill bit, and the diameter of the cylindrical connecting rod is smaller than the diameter of the inscribed circle of the drill shank.

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