A multi-coated turning insert

Abstract

The invention discloses a multi-coating turning blade, and relates to a coating turning tool for use in metal cutting machining. The multi-coating turning blade consists of a blade substrate and a coating which coats the blade substrate, wherein the blade substrate comprises a blade body of which the transverse section is square; the upper end face of the blade body is provided with a chip breaker groove; the chip breaker groove is defined by four groove edges of which the longitudinal sections are trapezoidal; the widths of the top surfaces of the groove edges are smaller than those of the bottom surfaces; the outer side faces of two adjacent groove edges are in transition connection through cambered surfaces; the inner side faces of the groove edges are inclined from the top surfaces of the groove edges to the inside of the chip breaker groove; the outer side faces of the groove edges are inclined from the top surfaces of the groove edges to the outside of the chip breaker groove; the bottom ends of the outer side faces of the groove edges are connected with the side face of the blade body; the coating is of a multilayer structure; the coating comprises a Ti connection layer, a TiN gradient transition layer, an AlZrTiN gradient transition layer and an AlZrTiN outer wear-resistant layer in sequence from the surface of the blade substrate to the outside. Good coiling and breaking effects are achieved on large-sized chips generated in a cutting process, the combination strength between the coating and the blade substrate is high, and the multi-coating turning blade is wear-resistant.

Description

technical field [0001] The invention relates to the technical field of turning tools for metal cutting, in particular to a multi-coated turning insert. Background technique [0002] During the metal cutting process, various types of chips will be generated due to different cutting conditions and workpiece materials. These chips need to be discharged in time, otherwise it will affect the cutting process. Long and large chips are easy to hurt the operator, which is not conducive to safe production, and will reduce the accuracy of the workpiece, increase the roughness of the workpiece surface, and reduce the cutting quality of the workpiece. Therefore, the generation of large chips should be avoided during the cutting process. It is a relatively common method to set a chip breaker on the blade to curl and break the chip, and the shape of the chip breaker has an important influence on the curl and break of the chip. The chip breaker structure of the existing insert has limited ...

AI Technical Summary

Problems solved by technology

At present, the commonly used PVD coating preparation process has a low treatment temperature, so the interface bonding strength between the coating and the blade substrate and between the coating and the coating is low, which limits the thickness of the coating and makes the coating under cutting load. Under the effect of cracking and peeling, the coating will soon fail due to cracking and peeling. The performance difference between the coating and the blade substrate is large, and a large residual stress is easily formed in the coating, which causes the blade to be easily produced under the strong load of efficient cutting of difficult-to-machine materials. microcrack

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