Table 2 Parameters and description in machining model B
Parameters | Description (Unit) |
|---|---|
d r , d s | Depth of cut for rough and finish machining (mm) |
\(d_{rL} , d_{rU}\) | Boundary of depth of cut in rough machining (mm) |
\(d_{sL} , d_{sU}\) | Boundary of depth of cut in finish machining (mm) |
d t | Depth of material to be removed (mm) |
D, L | Diameter and length of work-piece (mm) |
f r , f s | Feed rates in rough and finish machining (mm/rev) |
\(f_{rL} , f_{rU}\) | Boundary of feed rate in rough machining (mm/rev) |
\(f_{sL} , f_{sU}\) | Boundary of feed rate in finish machining (mm/rev) |
F U | maximum cutting force (kgf) |
h 1, h 2 | Constants relating to cutting tool travel time (min) |
k o | Labor cost include overhead cost ($/min) |
k f | Coefficient of specific tool work-piece combination |
k q | Coefficient of chip–tool interface temperature |
k t | Cutting edge cost ($/edge) |
\(k_{1} ,\upmu,\upupsilon\) | The constant values of cutting force equation |
\(k_{2} , \tau , \phi , \delta\) | Constants related to chip-tool interface temperature equation |
k 3, k 4, k 5 | Constants for roughing and finishing parameter |
n | Integer number of rough cuts |
p, q, r, C o | Constants of tool-life |
\(P_{r} , P_{s}\) | Cutting power during rough and finish machining (kw) |
P U | Maximum cutting power (kw) |
\(Q_{r} , Q_{s}\) | Chip–tool interface rough and finish machining temperatures (°C) |
Q U | Maximum allowable chip-tool interface temperature (°C) |
R a | Maximum allowable surface roughness (mm) |
R n | Nose radius of cutting tool (mm) |
S C | Limit of stable cutting region constraint |
SR U | Maximum surface roughness (mm) |
t e | Tool exchange time (min/edge) |
\(T, T_{r} , T_{s}\) | Tool life, expected tool life for rough machining and finish machining (min) |
t c | Constant term of machine idling time (min) |
T p | Tool life of weighted combination of T r and T s (min) |
\(T_{U} , T_{L}\) | Boundary for tool life (min) |
\(V_{r} , V_{s}\) | Cutting speeds in rough and finish machining (m/min) |
V rL , V rU | Boundary of cutting speed in rough machining (m/min) |
V sL , V sU | Boundary of cutting speed in finish machining (m/min) |
q | The weight for T p [0,1] |
\(\lambda , \nu\) | Constants related to expression of stable cutting region |
η | The power efficiency (%) |