Modeling and optimization of surface roughness and vibration amplitude in heat assisted end milling of SKD 11 tool steel using ball nose tool
Tool steel - SKD 11 is frequently used in industries for making dies and molds. This grade is chosen for its toughness, strength, and hardness maintained up to high temperature. However, the same properties make the steel extremely difficult and expensive to machine using conventional approaches....
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Trans Tech Publications, Switzerland
2012
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/30626/ http://irep.iium.edu.my/30626/ http://irep.iium.edu.my/30626/ http://irep.iium.edu.my/30626/1/AMR.538-541.799.pdf |
| Summary: | Tool steel - SKD 11 is frequently used in industries for making dies and molds. This grade
is chosen for its toughness, strength, and hardness maintained up to high temperature. However, the
same properties make the steel extremely difficult and expensive to machine using conventional
approaches. Heat assisted machining has been found wide spread application in recent years to
improve machinability of difficult-to-cut materials. This research paper presents the outcome of an
investigation on heat assisted end milling of SKD 11 conducted on a vertical machining center using
ball nose coated carbide inserts. The Design of Experiments (DoE) was done using the Response
Surface Methodology, in order to develop empirical mathematical models of surface roughness and
vibration in terms of cutting speed, feed, axial depth of cut, and heating temperature. The models were
checked for significance using Analysis of Variance (ANOVA). 3-D response surface graphs of the
interactions of primary cutting parameters with the responses were plotted. Optimization was then
performed by using the desirability function approach. From the graphs and optimized results it was
concluded that the primary input parameters could be controlled in order to reduce vibration
amplitude and produce semi-finished machined surfaces applying induction heat assisted technique. |
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