calc_pdf_t

Prévia do material em texto

<p>L</p><p>φ</p><p>D</p><p>2</p><p>φ</p><p>D</p><p>1</p><p>1. Cutting Time T [sec ]</p><p>TC ( Reference : n ) T1 ( Reference : vc )</p><p>External TC =</p><p>60 × L</p><p>f × n</p><p>T1 =</p><p>60 × π × L × Dm</p><p>1,000 × f × vc</p><p>Facing TC =</p><p>60 × ( D1 - D2 ) × N</p><p>2 × f × n</p><p>T1 =</p><p>60 × π × ( D1 + D2 ) × ( D1 - D2 ) × N</p><p>4,000 × f × vc</p><p>Grooving TC =</p><p>60 × ( D1</p><p>- D2 )</p><p>2 × f × n</p><p>T1 =</p><p>60 × π × ( D1 + D2 ) × ( D1 - D2 )</p><p>4,000 × f × vc</p><p>Cut-Off</p><p>φ</p><p>D</p><p>m</p><p>f</p><p>L</p><p>ap</p><p>Feed Direction</p><p>n</p><p>TC =</p><p>60 × D1</p><p>2 × f × n</p><p>T1 =</p><p>60 × π × ( D1 + D3 ) × ( D1 - D3 )</p><p>4,000 × f × vc</p><p>T2 ( Reference : vc, nmax )</p><p>T1 + T2 =</p><p>60 × D3</p><p>2 × f × nmax</p><p>f : Feed Rate [ mm/rev ]</p><p>n : Spindle Speed [ min-1]</p><p>L : Length of Cut [ mm ]</p><p>Dm : Diameter [ mm ]</p><p>D1 : Max. Diameter [ mm ]</p><p>D2 : Min. Diameter [ mm ]</p><p>D3 : Diameter at nmax [ mm ]</p><p>nmax : Max. Spindle Speed [ min-1]</p><p>※ π ≒ 3.14</p><p>2. Power Requirements PC [ kW ]</p><p>PC =</p><p>vc × f × ap × kC</p><p>60 × 1,000 × ( η ÷ 100 )</p><p>PC : Power Requirements [ kW ]</p><p>vc : Cutting Speed [ m/min ]</p><p>f : Feed Rate [ mm/rev ]</p><p>ap : Depth of Cut [ mm ]</p><p>kC : Specific Cutting Force [ MPa ]</p><p>η : Machine Efficiency [%] ( 70 ～ 85 )</p><p>Specific Cutting Force kC</p><p>Un alloyed 1,500 MPa</p><p>Low alloyed 2,000 MPa</p><p>High alloyed 3,000 MPa</p><p>Austenitic 2,000 MPa</p><p>Ferritic 2,500 MPa</p><p>Malleable 900 MPa</p><p>Grey 1,200 MPa</p><p>Ductile 1,500 MPa</p><p>A l based alloys 500 MPa</p><p>Cu based alloys 900 MPa</p><p>T i based alloys 1,400 MPa</p><p>Fe based alloys 2,500 MPa</p><p>N i based alloys 2,800 MPa</p><p>Co based alloys 3,000 MPa</p><p>Hardened steel 50-55 3,300 MPa</p><p>Hardened steel 60-63 4,500 MPa</p><p>Hardened cast iron 3,500 MPa</p><p>3. Cutting Speed vc [m/min ]</p><p>vc =</p><p>π × Dm × n</p><p>1,000</p><p>4. Spindle Speed n [min-1]</p><p>n =</p><p>vc × 1,000</p><p>π × Dm</p><p>5. Feed Rate f [mm/rev ]</p><p>f =</p><p>l × π × Dm</p><p>vc × 1,000</p><p>=</p><p>l</p><p>n</p><p>6. Theoretical surface roughness h [ μm]</p><p>h =</p><p>f2 × 1,000</p><p>8 × RE</p><p>7. Horsepower H [ HP ]</p><p>H =</p><p>PC</p><p>0.75</p><p>8. Material Removal Rate Q [cm3/min ]</p><p>vc × f × apQ =</p><p>9. Cutting Force P [ kN ]</p><p>P =</p><p>kC × f × ap</p><p>1,000</p><p>L</p><p>f</p><p>n</p><p>ap</p><p>φ</p><p>D</p><p>m</p><p>Feed Direction</p><p>h</p><p>f</p><p>RE</p><p>vc : Cutting Speed [ m/min ]</p><p>n : Spindle Speed [ min-1]</p><p>Dm : Diameter [ mm ]</p><p>f : Feed Rate [ mm/rev ]</p><p>h : Theoretical surface roughness [ µm ]</p><p>l : Length of Cut per minute [ mm ]</p><p>RE : Nose R [ mm ]</p><p>H : Horsepower [ HP ]</p><p>PC : Power Requirements [ kW ]</p><p>ap : Depth of Cut ap [ mm ]</p><p>kC : Specific Cutting Force [ MPa ]</p><p>※ π ≒ 3.14</p><p>Three cutting force components</p><p>Fc : Principal force</p><p>Ff : Feed force</p><p>Fp : Back force</p><p>Ff</p><p>Fp</p><p>Fc</p>