Download - Cutting temperature
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Cutting Temperature
Dr Jose Mathew
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Sources of heat generation in cutting
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Distribution of heat
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Effects of High Temperature
On Tool:Rapid Tool wearPlastic deformation of edgeThermal flaking and deformationBUE formation
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Effects of High Temperature
On Workpiece:*Thermal distortion and dimesionalinaccuracy*Surface damage by oxidation, corrosion, burning, etc.*Thermal micro cracks and residual stresses> Hot machining
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Purpose of measuring temp.
Assessment of machinabilityDesign and selection of cutting toolsHelps to proper selection of toolsProper selection of cutting fluidsAnalysis of temp distribution
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θs : average shear zone temperature θi : average (and maximum) temperature
at the chip-tool interface θf : temperature at the work-tool interface (tool fθavg : average cutting temperature
Important parameters for temperature
Measurement of Temperature
* Analytical* Experimental
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Analytical methodW=Wp+Ws ( W –total heat generated)Ws =FVc=FrVWp=FcV-FrVƟp =(1-ß)Wp / (ƿcVt1w)-ß fraction of primary heat which goes to the workpiece- ƿ density of the material
- c sp. Heat of the material- t1, w Uncut thickness, width of cut
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� is a function of shear angle Φand non dimesional quantity ƏƏ= ƿcVt1/kk-thermal conductivity of the material
�ß =0.15 ln (27.5/ Ə tan Φ)
ƟS + 1.13√[ (Ət2/l)(Ws/ƿcvwt1)]l - length of contact bet.tool and chip
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Ɵs av = Ws/ƿcvwt1
l/t2 = [1+tan (Φ -α )]
Ɵs=1.13 √(1/ƿcvt1k[1+tan (Φ -α )] (Ws/w)
Ɵ= Ɵ0+ Ɵp +ƟS
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Experimental methods
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Tool work thermocouple method
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Moving thermocouple
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Embedded thermocouple
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Compound rake used to measure the cutting temperature along the rake face
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Measuring temperature at shear plane and tool flank by photocell technique
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Temperature distribution at the tool tip detected by infra ray technique
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Role of variation of the various machining parameters on cutting temperature