Eksperimentalno istraživanje u cilju procene uticaja honovanog koničnog reznog sečiva na postojanost alata i kvalitet završne obrade kod obrade glodanjem čelika AISI4140

Pradeep Shiva,B.N Sarada,M Padmakumar

doi:10.5937/fmet1903437s

Abstract

Cutting edge preparation is proven to improve the tool life by avoiding sudden failures. Honed edge is effective in stabilizing the tool but has an adverse effect on surface quality. Tailored edge draws attention for research in improving the tool life and surface quality compared to symmetric honed edge. This research describes the advantages and limitations of trumpet edges over symmetrically honed edges in tool life and surface quality. The analysis carried out in milling of AISI 4140 steel with the trumpet edge of K=1.6 produced a surface of stable Ra value around 0.2μm with good quality. The tool life was not significantly varied with the trumpet edges since the both trumpet edge and symmetrical edges resulted in a tool life around 95 minutes. The results predict a distortion of tailored edge as it machines the work piece since the K-factor was reduced from 1.6 to 0.9.

Highlights

Tool geometry is found to be a key to developing the cutting tools with optimum performance
The results infer that the surface quality is improved by adopting cutting tools with higher K-factor
The edge-honing is effective in improving tool wear resistance and the performance of trumpet is evaluated in terms of tool life and surface roughness with symmetric edge in milling of AISI4140 steel

Summary

Introduction

Tool geometry is found to be a key to developing the cutting tools with optimum performance. It is seen that tool macro geometry controls the cutting forces and tool life. The micro-geometry refers to the edge preparation which is imparted into the tools in order to prevent early tool breakages. Edge preparation can either be chamfered or honed. The corner radius in combination with the smaller edge radius improves the tool life minimizing wear, whereas larger hone radius increases the forces [2]. The variation in feed has larger effect on forces in chamfered edge compared to honed edge. The honed edge produces lesser forces compared to chamfered edges [3].The edge honing was proven to be necessary to increase the stability of the tool by ensuring the edge to be more resistant to wear and avoiding stress concentration before coating [4]

Methods

Results

Conclusion