Step drill

Abstract

The utility model provides a step drill, which relates to the technical field of cutters and comprises a cutting portion and a cutter handle, the cutting portion is provided with a spiral groove structure, a cutting relief angle, a cutting diameter and a drill tip, the spiral groove structure comprises a first spiral groove, a second spiral groove and a dividing groove, and the cutting diameter comprises a plurality of steps with different diameters. The diameters of the steps are gradually increased in the direction from the drill tip to the cutter handle, the first spiral groove and the second spiral groove are formed in the cutting part in an unequal division mode, and the division groove is formed in the step position with the large diameter. The large side of the edge belt is segmented by adding the segmentation grooves, the number of the cutting edges is increased, the cutting force change of a large step is reduced, the single-tooth cutting amount is reduced, friction borne in the cutting process is reduced, and the cutting temperature and resistance are reduced; the guide strips play a supporting role, the vibration resistance stability and the hole wall roughness in the cutting process can be improved, and the vibration resistance effect of the cutter is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of tool tools, in particular to a step drill. Background Art

[0002] At present, during the test processing, due to the need to achieve an asymmetric cutting edge and the different angles of the spiral grooves processed, the tool will experience increased torsional force and cutting resistance during the last few cutting steps due to the increase in single-tooth cutting volume, which will cause the temperature during processing to rise significantly. This leads to the common pistol drill cutting environment. The large torque and resistance will make it difficult for users to bear, affecting normal use, reducing processing efficiency, and also reducing the service life of the tool. In response to the above defects, this application is proposed. Utility Model Content

[0003] The utility model aims to provide a step drill, which reduces the torsional force and cutting resistance of the tool during the machining process and solves the problems of low machining efficiency and short service life of traditional tools.

[0004] In order to solve the above problems, the utility model provides a step drill, including a cutting part and a tool holder, the cutting part is provided with a spiral groove structure, a cutting back angle, a cutting diameter and a drill tip, the spiral groove structure includes spiral groove 1, spiral groove 2 and a dividing groove, the cutting diameter includes a plurality of steps of different diameters, and the step diameter gradually increases from the drill tip to the tool holder, so that it can meet the cutting purposes of different hole diameters, the spiral groove 1 and spiral groove 2 are arranged on the cutting part in an unequal manner, the dividing groove is arranged at the position of the step with larger diameter, and the larger cutting band at the step with larger diameter is divided, and by adding the dividing groove, the side of the cutting band with excessive size is decomposed from a large cutting band into at least two, so that the cutting edge is increased from two edges to three edges and participates in cutting, reducing the cutting force change of the larger step, reducing the cutting amount of a single tooth, achieving the reduction of friction suffered during the cutting process, reducing cutting temperature and resistance, improving cutting efficiency, ensuring the service life of the tool, improving the processing quality of the tool, better adapting to the cutting environment, and reducing manpower consumption.

[0005] According to an embodiment of the present invention, the cutting portion is provided with a plurality of guide bars, and the guide bars are connected to at least a portion of the cutting diameter.

[0006] According to an embodiment of the present invention, the guide bars on adjacent cutting diameters are staggered.

[0007] Furthermore, the guide bars are arranged at different positions on different cutting diameters, so that the guide bars can be better kept stable during drilling, the quality of the processed hole walls can be higher, and the quality of tool use can be improved.

[0008] Optionally, the guide bars are arranged in one group or several groups on one cutting diameter.

[0009] Optionally, the guide bar and the cutting diameter are integrally formed, or the guide bar is connected to the cutting diameter by welding or other connection methods.

[0010] Optionally, the dividing groove is a spiral groove or a groove of other shapes.

[0011] Optionally, the dividing grooves are provided in one group or several groups.

[0012] According to an embodiment of the present invention, the dividing groove is connected to the first spiral groove or the second spiral groove to facilitate chip removal.

[0013] According to an embodiment of the present invention, the knife handle is a triangular handle, and may also be other handle shapes, and can be used for connection with other mechanical equipment.

[0014] The beneficial effects of the present invention are as follows: by adding a dividing groove to divide the excessive side of the blade, the number of cutting edges is increased, the cutting force variation of the larger step is reduced, the cutting amount of a single tooth is reduced, the friction encountered during the cutting process is reduced, the cutting temperature and resistance are reduced, the cutting efficiency is improved, the service life of the tool is guaranteed, the processing quality of the tool is improved, it is better adapted to the cutting environment, and the consumption of manpower is reduced; the guide bar plays a supporting role, the vibration stability of the cutting process and the improvement of the roughness of the hole wall can be achieved, the vibration resistance of the tool is achieved, and the different positions of the guide bar at different cutting diameters can better keep it stable during drilling, the quality of the processed hole wall is higher, and the comfort of tool use is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the step drill;

[0017] Figure 2 for Figure 1 Schematic diagram of the structure at AA in the middle. DETAILED DESCRIPTION

[0018] The following description is intended only to disclose the present invention and to enable those skilled in the art to implement the present invention. The embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0019] A step drill, such as Figure 1, is a high-speed steel step drill, including a cutting portion 10 and a shank 8. The shank 8 is a triangular shank, and can also be of various other shank types, and can be used for connection with other mechanical equipment.

[0020] like Figure 2 The cutting portion 10 is provided with a spiral groove structure, a cutting back angle, a cutting diameter 9 and a drill tip 7, wherein the spiral groove structure includes a spiral groove 1, a spiral groove 2 and a dividing groove 5, wherein Figure 2 , the cutting back angle includes cutting back angle 3 and cutting back angle 4.

[0021] The cutting diameter 9 includes several steps of different diameters, and the step diameters gradually increase from the drill tip 7 to the tool shank 8, so that it can meet the cutting purposes of different hole diameters.

[0022] The cutting portion 10 is provided with a plurality of guide bars 6, which are arranged on part of the cutting diameter 9. The guide bar 6 is a raised long strip structure arranged along the axial direction. The guide bar 6 and the cutting diameter 9 are integrally formed. The guide bar 6 is arranged at different positions on different cutting diameters 9, and a group of guide bars 6 is arranged on one cutting diameter 9. The guide bar 6 can achieve vibration stability during the cutting process and improve the roughness of the hole wall, so that the tool can be better kept stable during drilling, the quality of the processed hole wall is higher, and the quality of tool use is improved.

[0023] The spiral groove 1 and the spiral groove 2 are arranged on the cutting part 10 in an unequal manner to ensure the symmetry of the drill tip 7. By processing spiral grooves with different spiral angles, the unequal form is ensured when transitioning to different diameters.

[0024] After the tool is processed by the unequal helix angle, the step edge of the side with the larger diameter step will be too large. When the back angle 3 is ground, the further the ground is ground, the greater the drop. Although there is a guide bar 6 as support, as long as the angle deviates during drilling, the force cutting amount on the side with the larger edge edge will increase, and a certain torque change will occur, which increases the difficulty of cutting. If the ground amount is small, the tool will have less space to squeeze during the cutting process, and there will be a certain amount of jumping during cutting. It will be subjected to excessive friction, which will increase the cutting temperature and resistance, reduce the tool life and cutting difficulty. In this solution, The dividing groove 5 is set at the position of the step with a larger diameter. The dividing groove 5 is a spiral groove and is connected to the spiral groove 2 to facilitate chip removal, thereby dividing the larger blade at the larger diameter step. By adding the dividing groove 5, the side of the blade with an excessively large blade is divided into two by a large blade, so that the cutting edge is increased from two edges to three edges and participates in cutting, reducing the cutting force change of the larger step, reducing the single tooth cutting amount, achieving the reduction of friction during the cutting process, reducing cutting temperature and resistance, improving cutting efficiency, ensuring the service life of the tool, improving the processing quality of the tool, better adapting to the cutting environment, and reducing manpower consumption.

[0025] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations and modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A step drill, characterized by: The invention comprises a cutting portion (10) and a tool holder (8), wherein the cutting portion (10) is provided with a spiral groove structure, a cutting back angle, a cutting diameter (9) and a drill tip (7), wherein the spiral groove structure comprises a spiral groove 1 (1), a spiral groove 2 (2) and a dividing groove (5), wherein the cutting diameter (9) comprises a plurality of steps of different diameters, wherein the step diameter gradually increases from the drill tip (7) to the tool holder (8), wherein the spiral groove 1 (1) and the spiral groove 2 (2) are arranged on the cutting portion (10) in an unequal manner, and wherein the dividing groove (5) is arranged at the position of the step with a larger diameter, and divides the larger edge band at the step with a larger diameter.

2. The step drill according to claim 1, characterized in that: The cutting portion (10) is provided with a plurality of guide bars (6), and the guide bars (6) are connected to at least part of the cutting diameter (9).

3. The step drill according to claim 2, characterized in that: The guide bars (6) on adjacent cutting diameters (9) are staggered.

4. The step drill according to claim 3, characterized in that: The guide bar (6) is arranged at different positions on different cutting diameters (9).

5. The step drill according to any one of claims 2 to 4, characterized in that: The guide bars (6) are arranged in one or more groups on a cutting diameter (9).

6. The step drill according to any one of claims 2 to 4, characterized in that: The guide bar (6) and the cutting diameter (9) are integrally formed.

7. The step drill according to any one of claims 1 to 4, characterized in that: The dividing groove (5) is a spiral groove.

8. The step drill according to claim 7, characterized in that: The dividing grooves (5) are provided in one group or several groups.

9. The step drill according to claim 7, characterized in that: The dividing groove (5) is connected to the spiral groove 1 (1) or the spiral groove 2 (2).

10. The step drill according to claim 7, characterized in that: The knife handle (8) is a triangular handle.

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