Tungsten steel flat drill

Abstract

The invention relates to a tungsten steel flat drill, which comprises a tool blade and a tool handle that are formed integrally. The tungsten steel flat drill is characterized in that the tungsten steel flat drill is made of a tungsten steel material, the tool handle is a cylindrical straight handle; the tool blade is in a step shape; a transition part is arranged between the tool blade and the tool handle; a round table is arranged at the bottom end of the transition part; a cambered chip discharge groove is formed from the round table to a rake face of the tool blade; the tool blade is in a two-stage type; the first-stage tool blade is positioned at the front end of the tool blade; the width of the first-stage tool blade increases stage by stage; cutting edges of the first-stage tool blade and the second-stage tool blade are arranged at the edge of the tool blade; an edge point is arranged at the top end of the first-stage tool blade; and a 45 DEG cutting edge is arranged at a connection part between the second-stage tool blade and the transition part. The tungsten steel flat drill has a large chip discharge area and is long in service life; chips are discharged smoothly; as the tool blade of the tungsten steel flat drill is in a step shape, two step holes in different diameters and outer hole chamfers can be processed once without aligning a tool; and the processing precision and the working efficiency are improved greatly.

Description

technical field [0001] The invention relates to a hole processing tool, in particular to a tungsten steel flat drill. Background technique [0002] At present, when machining coaxial holes on a workpiece, it is generally necessary to use multiple tools to mill out holes with different diameters. During the machining process, not only need to replace the tools, but also need to re-set the tools, which is time-consuming and laborious, and the production efficiency is low. However, due to the inevitable errors in the process of resetting the tool, the coaxiality deviation of the processed holes is relatively large, and the processing accuracy is low. And, because the drill bit in the prior art has little space for chip removal, the phenomenon of drill sticking often occurs, causing damage to the workpiece and the drill bit. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, and provide a flat dri...

AI Technical Summary

Problems solved by technology

[0002] At present, when machining coaxial holes on a workpiece, it is generally necessary to use multiple tools to mill out holes with different diameters. During the machining process, not only need to replace the tools, but also need to re-set the tools, which is time-consuming and laborious, and the production efficiency is low. However, due to the inevitable error in the process of resetting the tool, the coaxiality deviation of the machined hole is relatively large, and the machining accuracy is low.

Moreover, due to the small chip removal space of the drill bit in the prior art, the phenomenon of drill sticking often occurs, resulting in damage to the workpiece and the drill bit

Images