ME364_cutting_wear - Valery Marinov, Manufacturing...

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Tool Wear and Tool Life 77 Valery Marinov, Manufacturing Technology Introduction The life of a cutting tool can be terminated by a number of means, although they fall broadly into two main categories: ± gradual wearing of certain regions of the face and Fank of the cutting tool, and ² abrupt tool failure. Considering the more desirable case ± the life of a cutting tool is therefore determined by the amount of wear that has occurred on the tool pro±le and which reduces the ef±ciency of cutting to an unacceptable level, or eventually causes tool failure (case ² ). When the tool wear reaches an initially accepted amount, there are two options, ± to resharpen the tool on a tool grinder, or ² to replace the tool with a new one. This second possibility applies in two cases, (i) when the resource for tool resharpening is exhausted. or (ii) the tool does not allow for resharpening, e.g. in case of the indexable carbide inserts discussed in Section 5.8 . Wear zones Gradual wear occurs at three principal location on a cutting tool. Accordingly, three main types of tool wear can be distinguished, ± crater wear ² Fank wear ³ corner wear These three wear types are illustrated in the ±gure: 5.5 TOOL WEAR AND TOOL LI²E Crater wear Chip contact area Major cutting edge perfectly sharp at the beginning of cutting worn after cutting for some period of time Flank wear Corner wear VB Tool cutting part Types of wear observed in cutting tools
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Tool Wear and Tool Life 78 Valery Marinov, Manufacturing Technology v Crater wear : consists of a concave section on the tool face formed by the action of the chip sliding on the surface. Crater wear affects the mechanics of the process increasing the actual rake angle of the cutting tool and consequently, making cutting
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ME364_cutting_wear - Valery Marinov, Manufacturing...

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