Deep hole forming tool

Abstract

The invention relates to the technical fields of cutting tools, particularly to a deep hole forming tool. The deep hole forming tool comprises a tool shank and a cutting module at the front end of the tool shank, wherein the cutting module is composed of a third cutting unit connected with the tool shank, a second cutting unit at the front end of the third cutting unit, and a first cutting unit at the front end of the second cutting unit; the third cutting unit and the second cutting unit are in a ball shape and are connected through a transitional smooth curved surface; the first cutting unit is composed of a taper unit connected with the second cutting unit, and a ball unit at the front end of the taper unit, and the small-diameter end of the taper unit is smoothly connected with the second cutting unit; the cutting module is provided with at least three screw cutting edges uniformly distributed in the circumferential direction of the cutting module, and the screw cutting edges are correspondingly provided with screw flutes and converge in the center of the front end of the first cutting unit. According to the deep hole forming tool, during a cutting process, the contact area between the cutting module and hole walls can be small, so that the possibility of tool tipping due to radial movement can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of cutting tools, in particular to a forming knife for deep holes. Background technique [0002] At present, for the processing of deep holes, twist drills are generally used to drill holes. The deep holes processed by twist drills have poor hole wall roughness and low hole precision, which cannot meet the needs of use. At present, among the cutting tools used for finishing holes, the reamer has the highest machining accuracy. , due to the large contact area between the cutting part of the reamer or forming knife and the hole wall during cutting, under the influence of radial runout, the reamer or forming knife is easy to collapse, and the collapsed reamer or forming knife will affect the hole wall The surface quality, even the broken knife reamer or forming knife is stuck in the deep hole, which brings troubles to the processing of deep holes. Contents of the invention [0003] The technical problem to ...

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Problems solved by technology

[0002] At present, for the processing of deep holes, twist drills are generally used to drill holes. The deep holes processed by twist drills have poor hole wall roughness and low hole precision, which cannot meet the needs of use. At present, among the cutting tools used for finishing holes, the reamer has the highest machining accuracy. , due to the large contact area between the cutting part of the reamer or forming knife and the hole wall during cutting, under the influence of radial runout, the reamer or forming knife is easy to collapse, and the collapsed reamer or forming knife will affect the hole wall Surface quality, even broken knives, reamers or forming knives get stuck in deep holes, which brings troubles to deep hole processing

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