Ejercicios 5-8 estiraje

 PROBLEMA 5

Estiraje por desarrollos

N1= (2800)(28)(23)(50)(50)(27) / (15)(41)(23)(80)(30)= 3,585.35rpm

D1= π x 3” x 3,585.35= 33,791.12”/min

N2= (2800)(28) / (15)= 5,226.66rpm

D2= π x 1.5” x 5,226.66= 26,630.05”/min

N3= (2800)(28)(23) / (15)(41)= 2,932.021rpm

D3= π x 2 x 2932.02= 18,422.42”/min

N4= (2800)(28)(23)(25) / (15)(41)(14)= 5,235.75rpm

D4=  π x 1.5 x 5235.75= 24,672.89”/min

N5= (2800)(28)(23)(13) /(15)(41)(27)= 1,411.71rpm

D5=  π x 5 x 1,411,71= 22,175.08”/min

Total

ET= Dcil productor/ Dcil alimentador

ET= 22,175.08”/min / 3,379.12”/min= 0.65

Parcial

1-3= 18,422,42”/min / 33,791.12”/min= 0.5451

3-4= 24,672.89”/min / 18,422.42”/min= 1.3392

4-5= 22,175.08”/min / 24,672.89”/min= 0.8987

ET= 0.5452 x 1.3392 x 0.8987= 0.65

Estiraje por relación de engranes

Total

ET=  π x dcil productor x ncil productor/ π x dcil alimenatdor x ncil alimentador

ET= (5”)(30)(80)(23)(13) / (3”)(27)(50)(50)(27)= 0.65

Parcial

1-3= (2”)(30)(80)(23) / (3”9(27)(50)(50)= 0.54

3-4=(1.5”)(25) / (2”)(14)= 1.3392

4-5= (5”)(14)(13) / (1.5”)(25)(27)= 0.8987

ET= 0.54 x 1.3392 x 0.8987= 0.65

PROBLEMA 6

Estiraje por desarrollos:

N1= (7000)(32) / (12)= 18,666 rpm

D1= π x 2.125” x 18,666= 124,612”/min

N2= (7000)(32) / (31)= 7,225 rpm

D2= π x 2.25” x 7,225= 51,070”/min

N3= 7000 rpm

D3= π x 1.33” x 7000= 29,248”/min

N4= (7000)(57) / (72)= 5,541 rpm

D4= π x 2” x 5541= 34,815”/min

N5= (7000)(57)(20)(19)(28)(25) / (72)(16)(35)(59)(35)= 1,274 rpm

D5= π x 4.75” x 1,274= 19,011”/min

Total

ET= Dcil productor/ Dcil alimentador

ET= 19,011”/min / 124,612”/min= 0.15

Parcial

1-2= 51,070”/min / 124,612”/min= 0.40

2-3= 29,248”/min / 51,070”/min= 0.57

3-4= 34,815”/min / 29,284”/min= 1.19

4-5= 19,011”/min / 34,815”/min= 0.54

ET= 0.40 x 0.57 x 1.19 x 0.54= 0.14

Estiraje por relación de engranes

Total

ET= π x desarrollo productor x n alimentador/ π x desarrollo alimentador x n alimentador.

ET= (4.75”)(12)(57)(20)(19)(28)(25) / (2.125”)(32)(72)(16)(35)(59)(35)= 0.15

Parcial

1-2= (2.25”)(12) / (2.125”)(31)= 0.40

2-3= (1.33”)(31) / (2.25”)(32)= 0.57

3-4= (2”)(57) / (1.33”)(72)= 1.19

4-5= (4.75”)(20)(19)(28)(25) / (2”)(16)(35)(59)(35)= 0.54

ET= 0.40 x 0.57 x 1.19 x 0.54= 0.14

PROBLEMA 7

Estiraje por desarrollos:

N1= (3200)(45)(12) / (30)(22)= 2,618.18 rpm

D1= π x 2.5” x 2,618.18= 20,563.13”/min

N2= (2618.18)(28) / (70)= 1,047.27 rpm

D2= π x 1.125” x 1,047.27= 3,701.35”/min

N3= (3200)(74) / (47)= 5,038.29 rpm

D3= π x 5” x 5,038.29= 79,141.27”/min

N4= (5038.29)(84) / (22)= 19,237.10 rpm

D4= π x 2.25” x 19,237.10= 135,979.04”/min

N5= (3200)(65) / (24)= 8,666.66 rpm

D5= π x 4.75” x 8,666.66= 129,328.79”/min

N6= (3200)(65) / (21)= 9,904.76 rpm

D6= π x 1.5” x 9,904.76= 46,675.08”/min}

N7= (3200)(65) / (32)= 6,500 rpm

D7= π x 4.5” x 6,500= 91,891.58”/min

N8= (3200)(45) / (70)= 2,057.14 rpm

D8= π x 6” x 2,057.14= 38,776.17”/min

Total

ET= Dcil productor / Dcil alimentador

ET= 38,776.17 / 20,563.13= 1.88

Parcial

1-4= 135,979.04”/min / 20,563.13”/min= 6.6127

4-5= 129,328.79”/min / 135,979.04”/min= 0.9510

5-6= 46,675.08”/min / 129,328.79”/min= 0.3609

6-7= 91,891.58”/min / 46,675.08”/min= 1.9687

7-8= 38,776.17”/min / 91,891.58”/min= 0.4219

ET= 6.627 X 0.9510 X 0.3609 X 1.9687 X 0.4219= 1.88

Estiraje por relación de engranes:

Total

ET= π x dcil productor x n productor / π dcil alimentador x n alimentador

ET= (6”)(22)(30) / (2.5”)(12)(70)= 1.88

Parcial

1-4= (2.25”)(22)(30)(74)(84) / (2.5”)(12)(45)(47)(22)= 6.6127

4-5= (4.75”)(22)(47)(65) / (2.25”)(84)(74)(24)= 0.9510

5-6= (1.5”)(24) / (4.75”)(21)= 0.3609

6-7= (4.5”)(21) / (1.5”)(32)= 1.9687

7-8= (6”)(32)(45) / (4.5”)(65)(70)= 0.4219

ET= 6.6127 X 0.9510 X 0.3609 X 1.9687 X 0.4219= 1.88

PROBLEMA 8

Estiraje por desarrollos:

N1=(1800)(27)(19)(25)(20)(30)(72)(20)/(160)(40)(80)(15)(55)(30)(120)=13 rpm

D1= π x 1.125” x 13= 45”/min

N2= (1800)(27)(19)(25)(20) / (160)(40)(80)(15)= 60 rpm

D2= π x 5.125” x 60= 966”/min

N3= (1800)(27)(19) / (160)(58)= 99rpm

D3= π x 1.33” x 99= 413”/min

N4= (1800)(27)(19)(90) / (160)(58)(60)= 149 rpm

D4= π x 125” x 149= 585”/min

Total

ET= Dcil productor / Dcil alimentador

ET= 585”/min / 45”/min = 13

Parcial

1-2= 966”/min / 45”/min= 21.46

2-3= 413”/min / 966”/min= 0.42

3-4= 585”/min / 413”/min= 1.41

ET= 21.46 x 0.42 x 1.41= 11.98

Estiraje por relación de engranes.

Total

ET= π dcil productor x n productor / π dcil alimentador x n alimentador

ET= (1.25”)(120)(30)(55)(15)(80)(40)(90)           /                (1.125”)(20)(72)(30)(20)(25)(58)(60)= 12.6

Parcial

1-2= (5.125”)(120)(30)(55) / (1.125”)(20)(72)(30)= 21.47

2-3= (1.33”)(15)(80)(40) / (5.125”)(20)(25)(58)= 0.42

3-4= (1.25”)(90) / (1.33”)(60)= 1.40

ET= 21.47 x 0.42 x 1.4= 11.98