Indexable thread machining blade

Abstract

The invention discloses an indexable thread machining blade. The indexable thread machining blade comprises a blade body, wherein a blade center hole and cutting edge parts are arranged on the blade body; the cutting edge part is surrounded by a front cutter surface, an edge angle arc surface, two edge angle side surfaces and a lower surface; the two edge angle side surfaces and the front cutter surface are intersected to form two side cutting edges; an included angle between the two side cutting edges is a cutting edge angle; the front cutter surface is connected with the upper surface of the blade body through a connecting curved surface; the front cutter surface is provided with a chip breaking boss symmetrically distributed along the angle bisector of the cutting edge angle; the chip breaking boss is surrounded by the front cutter surface, the connecting curved surface, a boss top surface, an arc surface and two side curved surfaces; the chip breaking bosses are transitionally connected with the front cutter surfaces and the connecting curved surfaces by arcs; and the boss top surfaces and the side curved surfaces are transitionally connected by arcs. The indexable thread machining blade is stable in cutting capacity, can satisfy the machining requirements of complex working conditions, can effectively control the bending and flowing directions of chips, can reduce the contact area between the chips and the front cutter surfaces, can effectively prolong the service life of a cutter, and can effectively improve the machining efficiency.

Description

technical field [0001] The invention relates to the technical field of metal cutting tools, in particular to an indexable thread insert for thread processing. Background technique [0002] Thread turning is an indispensable part of machining, and its main features are large feed per revolution and small depth of cut per cut, which requires the insert to have excellent wear resistance and chipping resistance. [0003] In thread processing, there are mainly three feeding methods, namely radial feeding, lateral feeding and alternating feeding. Using different feeding methods will have different effects on chip shape, thread quality and tool wear. Impact, in practical applications, more radial feed is used. The thread is processed through multiple passes, and the cutting depth of each cutting is gradually reduced. In the first half stage, due to the large cutting depth of each cutting, the chips generated are thicker and narrower. In the half stage, especially when the thread ...

AI Technical Summary

Problems solved by technology

The thread is processed through multiple passes, and the cutting depth of each cutting is gradually reduced. In the first half stage, due to the large cutting depth of each cutting, the chips generated are thicker and narrower. In the half stage, especially when the thread shape is about to be processed, the depth of cut becomes extremely small, and the generated chips become thinner and wider, it is difficult to curl and break by itself, and it is easy to wrap around the workpiece, tool and fixture, thereby damaging the workpiece surface and reduce tool life

[0004] As such an insert for thread cutting, for example, in Japanese Patent Application Laid-Open No. 8-257837, it is proposed not to provide a boss for curling chips on the rake face, so that the above-mentioned first half stage can be processed. Thick and narrow chips, but it cannot effectively control the thin and wide chips generated in the second half of the above stage, because the chips flow out directly at the speed of being cut from the workpiece without being resisted by the front, and the chips will be formed as long chips. Master and wrap around workpieces, tools and fixtures

[0005] As this kind of thread cutting insert, for example, in the patent application with publication number CN1765553A, it is proposed that a gradually receding inclined surface is provided on the inner side of the cutting edge, which can reduce chip resistance and can be used when the side feed method is adopted. Good chip handling performance is obtained, but at the same time, the strength of the cutting edge is reduced due to the existence of the inclined surface, which makes the insert difficult to process cast iron materials, and the application range has certain limitations

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