Material properties affecting cutting forces
Typ
Examensarbete för masterexamen
Program
Publicerad
2019
Författare
Bengtsson, Alexander
Johansson, Daniel
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
The aim of this master thesis is to evaluate the feasibility of using readily available
material properties to estimate the constants in the proposed models that describe
cutting resistance and therefore cutting force. The study is carried out for two types
of workpiece materials, each from a different ISO-group. The investigated materials
are 316L, an austenitic stainless steel, and 100Cr6, a high carbon through hardening
steel. 316L is delivered by two different suppliers while 100Cr6 is delivered in
three different hardening conditions, where the latter significantly alters the material
characteristics.
The study includes characterization of the workpiece materials with activities including
grain size estimation, inclusion analysis, tensile testing and hardness testing.
Machining experiments are performed using a CNC-lathe and the cutting resistance
is calculated based on the measured force response for a certain theoretical
chip thickness. The data is generated by using the stepwise increased feed-rate test
method. The relation between properties such as hardness and tensile strength with
the cutting resistance is presented for the 100Cr6 material. Since there is a connection
between the cutting resistance and the cutting force, it is thus feasible to
calculate the cutting forces under arbitrary cutting conditions and for different tool
geometries. It is also observed that, while the hardening condition of 100Cr6 has
a significant effect on its cutting resistance, only a slight difference exists between
316L produced by different suppliers.
Beskrivning
Ämne/nyckelord
Cutting forces , cutting resistance , machining , cutting resistance modeling , main cutting force modeling , 316L , 100Cr6 , material characterization