An indexable thread machining insert

Abstract

The invention discloses an indexable thread processing blade, which comprises a blade body. The blade body is provided with a center hole of the blade and a cutting edge. Enclosed by the lower surface, the two edge angle sides intersect with the rake face to form two side cutting edges, the angle between the two side cutting edges is the cutting edge angle, and the rake face is connected to the upper surface of the insert body through a curved surface The chip breaking bosses are arranged symmetrically along the bisector of the cutting edge angle on the rake face. The chip breaking bosses are surrounded by the rake face, the connecting curved surface, the top surface of the boss, the arc surface and two side curved surfaces. As a result, the chip breaking boss is respectively connected with the rake face and the connecting curved surface through a circular arc transition, and the top surface of the boss and the side curved surface are also connected through a circular arc transition. The invention has stable cutting ability and can meet the processing requirements of complex working conditions; can effectively control the curling and flow direction of chips, reduce the contact area between chips and the rake face, and effectively improve tool life and processing 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 machining. 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 knife, which requires inserts with excellent wear resistance and chipping resistance. [0003] In thread machining, there are mainly three feeding methods, namely radial feeding, lateral feeding and alternating feeding. Using different feeding methods for processing will produce different effects on chip shape, thread quality and tool wear. Influence, in practical applications, more use of radial feed. The thread is processed after several passes, and the depth of cut of each knife is gradually reduced. In the half stage, especially when the thread shape is to be processed, the depth of cut becomes extremely small, the generated chips become thinner and wide...

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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