tailieunhanh - Cutting Tool Technology Industrial Handbook by Graham T Smith_5

Tham khảo tài liệu 'cutting tool technology industrial handbook by graham t smith_5', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Turning and Chip-breaking Technology 69 ponent s strength and the mechanical strength of the chip illustrating that a complex metallurgical and cutting tool geometric relationship exists whilst machining occurs. In particular for turning operations a conventionally-turned chip is a rather frail product of serrated appearance see Figs 25 and 34a and b . In order to promote good chip-breaking tendencies thus enabling short elements to be formed it is necessary to encourage this basic character by causing these serrations to be as deep as possible and the chip sections in between to be rigid. This chip occurrence causes the chip to be inflexible which can then subsequently be broken. There are several distinct ways in which chips can then be broken these include Self-breaking - this is when the chip s mechanical strength is not great enough to hold the chip segments together and they consequently break upon exiting the machining region Fig. 31a Chip collision with the workpiece - as the chip is steered towards an obstacle such as the workpiece s surface this provides the breaking force see Figs. 33 and 34b Chip is stopped by the tool - here the chip-curling behaviour comes into play this being a function of the tool s nose radius geometry depth of cut and feedrate employed see Fig. 34 bottom left-hand photograph the latter two functions affecting the chip cross-section or chip thickness31. 31 Chip thickness is influenced by the plan approach angle utilised and the Doc in association with the selected feedrate. The chip thickness is measured across the cutting edge perpendicular to the cut . along the main cutting edge . The chip width and thickness are the dimensions that define the theoretical cut of the edge into the workpiece material. Hence the chip thickness will vary with the size of the plan approach angle according to the relationships involving feedrate Doc and the effective cutting depth. The chip thickness is related to the plan approach angle and this .

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