Abstract
This paper presents an investigation of the influence of machining data and workpiece thickness on drilling forces and moments during holes and treads forming in thin plates along with a multifactor linear regression analysis of the results. The research allows to predict optimal parameters for holes and treads forming in thin plates in order to optimise the drilling and tapping force along with the torque and, as a consequence, to decrease tool wear and extend the lifetime of the tools. DOI: http://dx.doi.org/10.5755/j01.mech.22.3.15263
Highlights
Thread machining is widely used operation in various industries; it is difficult to tap a hole in thinwalled parts due to the insufficient thickness
This paper presents an investigation of the influence of machining data and workpiece thickness on the force and moment of drilling and tapping during friction forming of threaded holes in thin plates along with a multivariable linear regression analysis of the results
A regression analysis was performed making presumption that the drilling force and the torque are stipulated as the entirety of drilling machining data, i.e. spindle rotational speed S, feed rate F, tool diameter D and sheet thickness t and could be expressed by a four variable regression model for Fdmax, T and T respectively
Summary
Thread machining is widely used operation in various industries; it is difficult to tap a hole in thinwalled parts due to the insufficient thickness. In order to avoid this problem, friction drilling along with fluteless tapping can be used These methods allow to produce threaded holes in thin plates by using special tungsten carbide and HSS tools without cutting edges. The fluteless tapping process of holes produced by friction drilling was not widely studied and the influence of machining data on the forces and moments which occurs during the process of drilling and tapping is not yet completely investigated. This paper presents an investigation of the influence of machining data and workpiece thickness on the force and moment of drilling and tapping during friction forming of threaded holes in thin plates along with a multivariable linear regression analysis of the results.
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