Molded flat drill

Abstract

The invention relates to a molded flat drill. The molded flat drill is characterized in that the molded flat drill is in an integrated molding structure and comprises a cylindrical handle part (1), wherein a flat drill bit is connected with the front end of the handle part; a transition arc (2) is arranged at a connection part between the handle part and the drill bit; the drill bit is in a two-stage type structure; the width of a first-stage drill bit (3) arranged at the front end of the drill bit is smaller than that of a second-stage drill bit (4) arranged at the back of the first-stage drill bit; an edge point (5) is arranged at the top end of the first-stage drill bit; an edge point angle of the edge point (5) is 90 degrees; the first-stage drill bit is transited to the second-stage drill bit through a chamfer; cutting edges (6) are arranged at the edges of the edge point and the first-stage drill bit; and a chamfer edge (7) is arranged at the transition part between the first-stage drill bit and the second-stage drill bit. With the adoption of the molded flat drill, a molded hole with a bottom surface cone and a hole chamfer can be molded once, so that the working efficiency is improved greatly; in addition, as the molded hole is molded once, the coaxiality and the overall precision of all parts are also improved greatly; and as the flat drill bit is adopted by the molded flat drill, a chip discharge groove of the molded flat drill is large, and the cutting edges are sharp, the surface smoothness of the processed hole is improved.

Description

technical field [0001] The invention relates to a hole processing tool, in particular to a flat drill. Background technique [0002] In the prior art, when processing a forming hole with a complex structure, it is generally necessary to use multiple tools, such as processing a forming hole with a bottom cone and a chamfered hole, it is generally necessary to use a twist drill to drill the hole first, and then use a flat end milling cutter Flatten the bottom surface of the hole, then use the cone milling cutter to process the hole bottom cone, and finally use the chamfering knife to process the chamfering of the hole opening. In this way, four tools are required to process a forming hole, which is time-consuming and labor-intensive. In addition, after changing the tool, it needs to be restarted. Tool setting, there must be errors in the process of tool setting, so that the coaxiality deviation of each part is large, and the precision of the forming hole is low. Contents of ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, when processing a forming hole with a complex structure, it is generally necessary to use multiple tools, such as processing a forming hole with a bottom cone and a chamfered hole, it is generally necessary to use a twist drill to drill the hole first, and then use a flat end milling cutter Flatten the bottom surface of the hole, then use the cone milling cutter to process the hole bottom cone, and finally use the chamfering knife to process the chamfering of the hole opening. In this way, four tools are required to process a forming hole, which is time-consuming and labor-intensive. In addition, after changing the tool, it needs to be restarted. Tool setting, there must be errors in the process of tool setting, so that the coaxiality deviation of each part is large, and the precision of the forming hole is low

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