《MP3后盖塑料模具毕业设计》.pdf

1 1.1 ABS -- 1.1.1 ABS ABS ABS ABS ABS ABS 1.02 g/cm3 ~1.20 g/cm 3 , ABS ABS ABS 372 1.1.2 1 2 0.3% 3 0.04mm AS , 4 250 50 ~60 80 ~ 5 2 1.20g/cm3 0.8% 85 3h 170 180 200 180 80 100 29s 5s 120s 220s 4h 2. 1 2.1.1 1.8 .2 2.2.4 3 2.2.5 ABS,ABS 1.01 g/cm 3 3 V 19.56 ×10 mm 3 19.56cm m 21.5g m 2 m 1.6 ×2×21.5 68.8g 4 2.2 Pro/E m 21.5g 1 v 19.56m3 1 t 45s 5 3.1 3.2.1 6 MT3 3.2.2 7 3-3 d 3.5mm α 3 ° sin1.5 3.5 2 49 6.1 D + × ° × mm cos1.5 8 π 2 π 3.5 +6.1 2 3 3 q dn L ×49 835.364mm 0.84cm 4 4 2 9 L1 70mm L2 15mm D 0.2654 m 4 L 0.2654 21.5×2 4 70 2.6511mm D 6mm m g L mm Dmm 3.4.3 PEPA 2mm PCHPVC PMMA 13mm6 10 3-7 3.4.4 a b a 3-10 11 3.5.4 0.070.09 0.52mm . d nk 4 A dmm n kk 0.206 t 0.206×1.8 0.3708 Amm tmm L2 1.5mm L1 1.26mm 3.5.5 4 5 ?1 γ 10 ~ 10 s γ 4q γ 2 πRn ?1 γ s qcm3 s Rn cm 12 4 ×47.9 ?1 γ 3 45468s 3.14 × 0.04 3 4 ?1 × × 5 10 5 10 s 3.6.1 13 1— 23456 aZ bc d ef a~ cd~ f Z 3.6.2 T8A 5055HRC d 8mm D 13mm L 118mm 14 3-13 3-14 18 a8 b 30 3.8.4 H8/f7 H7f7 0.5~1 mm 0.05~0.1mm 1~0.15mm 0.5mm 3.8.5 15 3.8.6 45 T8 T10 50HRC Ra1.6μm 3.8.7 ° ° θ α 2 ~ 3 2 3 3.9.1 ° ° ° α25 12 ~ 25 α ° 15 16 3.9.2 2πr Eεhk QC cp f 1+ +k cos μ λ β F f ′ ′2 [1 2f tanα f ]cosα ? ? 144.397 ° 2 ° + × × ? [1 2 0.1 tan18 0.1 ]cos18 17 164.122N f ′f ′ 0.1 ° αα 15 3.9.3 2mm ~ 3mm S 1.5+2 3.5mm S L sinα S mm ° α S L sinα 3.5 ° sin15 13.7mm 1 10NL d 3 σ pb 10×164.122×13.7 140 4.82mm NN Lmm σ T8A σ 140 MPa pb pb 12.5mm 3.9.4 L Sα D 1.66d 15.2mm D 16mm h 32mm D h d S L tan α + + tan α+ +5 ~ 15mm 2 cosα 2 sin α 16 ° 32 4.82 ° 3.5 L tan15 + + tan15 + +5mm ° ° 2 cos15 2 sin15 18 77.82mm L 78mm 3.9.5 α α +β α β ° ° 1 1 ° ° ° α 15 + 17 1 3.9.6 h tan α s c c 3.9.7 3.9.8 T 3-9 19 3.10.1 Z L L 20 20~40 40~60 60~80 z 0.02~0.03 0.03~0.05 0.04~0.06 0.05~0.07 3.10.2 4.1.1 1 1 20 2 3 4 4.1.2 1 2 3 4 3 ~ 5mm 0.1 ~ 1mm 4.1.3. 21 2 4 H7/f7H7/k6 H6/k6 1.5~2 4.2.1 1~1.5 8~12 mm 20 T8 T10 50~55HRC Ra0.8~R