Deflexión de la barra de mandrinar

Requisito de deflexión de la barra de mandrinar, fuerzas de corte y potencia

Unit:

Conversion of Workpiece Material Rockwell (Optional)

Skip this step if you already know the Brinell hardness number(HB)

Hardness HRB OR HRC into Brinell Hardness (HB)

Boring Bar Dimensions

D_o Outside diameter: in mm

D_i Inside Diameter / Coolant Hole Size: in mm

If bar does not have a coolant hole use 0

L Unsupported length: in mm

Boring Bar Material Properties

Em_c Modulus of elasticity: psi N/mm2

Workpiece

d Bore diameter: in mm

BHN Brinell Hardness:

K_p Power constant: hp/in.³/min. kW/cm³/min

"p" Values (hp/ln.³/min) for machining conditions.

Type of material	Designation	Hardness	Finishing	Roughing	General
Carbon steel	AISI 1018	141	0.70	0.66	0.62
Carbon steel	AISI 1045	195	0.74	0.70	0.72
Alloy steel	AISI 4140	194	0.79	0.74	0.73
Alloy steel	AISI 4340	214	0.76	0.72	0.73
Alloy steel	AISI 4140	258	0.85	0.77	0.79
Alloy steel	AISI 4142	277	0.84	0.77	0.75
Alloy steel	AISI 4340	485	1.31	1.00	1.05
Tool steel	AISI H11	205	0.78	0.73	0.76
	AISI 316L	147	0.81	0.73	0.73
	AISI 410	243	0.81	0.71	0.74
	AISI 17-4 PH	294	0.99	0.70	0.72
Gray cast iron	SAE G3000	195	0.53	0.48	0.47
Ductile cast iron	ASTM 65-45-12	165	0.58	0.55	0.51
Titanium alloy	AMS Ti-6Al-4V	287	0.64	0.62	0.62
Nickel alloy	Inconel 718	277	1.20	1.01	1.02
Aluminum alloy	AMS 2024	139	0.31	0.29	0.30

Machining Conditions

a_p Depth of cut: in mm

f_n Feed rate: ipr mm/rev

V_c Cutting speed: sfm mm/min

E Machine tool efficiency factor:

Machine Tool Efficiency Factors

Direct Belt Drive	.9
Back Gear Drive	.75
Geared Head Drive	.7-.8
Oil - Hydraulic Drive	.6-.9

Calcular

Your Results

L/D_o Ratio of unsupported length to outside diameter:

I Moment of inertia of the boring bar cross section: in mm ⁴

n Spindle speed: rpm

Q_z Metal removal rate: in. cm ³/min

Dynamics of Boring

F_t Tangential force: lb N

F_f Radial force: lb N

F_r Resultant force: lb N

Y_t Maximum deflection: in mm

Horsepower Calculation

P_s Horsepower at the cutting tool: hp KW

P_m Horsepower at the motor: hp KW

T Torque: ft-lbs Nmm

These calculations are based upon theoretical values and are only intended for planning purposes. Actual results will vary. No responsibility from Kennametal is assumed.

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