texnologichnost litix detaley

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lektsiya 6. texnologichnost litix detaley 6.1. osobennosti konstruirovaniya s uchetom liteynix svoystv splava 6.6. proektirovanie narujnix poverxnostey litix detaley. 6.3. proektirovanie vnutrennix poverxnostey otlivok 6.1. osobennosti konstruirovaniya s uchetom liteynix svoystv splava jidkotekuchest splava opredelyaet v konstruktsii detali vibor minimalnoy tolshini stenok neobrabativaemix poverxnostey. minimalnuyu tolshinu detali x, mm opredelyayut na diagramme (ris.6.1) v zavisimosti ot privedennogo gabaritnogo razmera n: (6.1) gde l, b, h - dlina, shirina, visota otlivki, mm tolshina vnutrennix stenok i reber prinimayut na 10...20% menshe tolshini narujnix stenok. u litix detaley tolshinu stenki neobxodimo naznachat s uchetom trebuemoy raschetnoy prochnosti, jidkotekuchesti splava i zapolnyaemosti formi. vsyakoe uvelichenie tolshini stenki privodit k zamedleniyu skorosti kristallizatsii splava, chto skazivaetsya na neodnorodnosti strukturi, snijenii prochnosti i vozniknovenii defektov otlivki. dlya vibora ili otsenki naimenshey tolshini stenki otlivki pri lite v peschanie formi mojet bit ispolzovana tabl. 6.1. ris. 6.1. diagramma dlya opredeleniya minimalnoy tolshini stenok otlivok iz razlichnix …

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ix defektov dostigaetsya sozdaniem konstruktsii s ravnomernoy tolshinoy stenok bez bolshogo skopleniya metalla v otdelnix mestax. ravnomernost tolshini stenki i skoplenie metalla opredelyayut diametrom vpisannoy okrujnosti (ris. 6.2, a, b). jelatelno, chtobi sootnoshenie diametrov vpisannoy okrujnosti v blizko raspolojennix secheniyax ne previshalo 1,5. eto dostigaetsya umensheniem, s pomoshyu uglubleniy v stenkax otlivki (ris. 6.2, v); smesheniem stenki (ris. 6.2, g); esli eto nevozmojno, to sleduet predusmotret otverstie (ris. 6.2, d). tablitsa 6.1. minimalnaya tolshina stenki otlivki pri lite v peschanie formi. material massa otlivki, kg maksimalnaya dlina stenki, mm minimalnaya tolshina stenki, mm stal do 100 do 200 8…10 100...1000 200…800 16...14 chugun seriy do 100 do 200 3…4 100…1000 200…800 6…8 chugun kovkiy do 100 do 100 2,5...3,5 100…300 100…200 4…5,5 bronza olovyanistaya do 10 do 50 3…4 10…50 50…100 5…6 sv.50 sv. 100 7…8 bronzi i latuni spetsialnie do 0,25 do 50 6…7 0,25...4,00 50…100 8…10 splavi alyuminievie …

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inkovie splavi 0,5 0,8 1,0 1,5 2,0 alyuminievie splavi 0,8 1,2 1,5 2,5 3,0 magnievie splavi 1,0 1,5 2,0 2,5 - mednie splavi 2,0 2,5 3,0 3,5 - tablitsa 6.3. minimalnaya tolshina stenok otlivki pri kokilnom lite, mm. material ploshad poverxnosti stenki, sm2 minimalnaya tolshina stenki, mm chugun do 5 4.5 chugun 25... 125 6.7 stal 25... 125 8 alyuminievie splavi do 30 3.4 magnievie splavi do 30 3 bronza do 30 4.6 tablitsa 6.4. naimenshaya tolshina stenok otlivok pri lite v obolochkovuyu formu, mm. splavi naibolshiy gabaritniy razmer otlivok, mm do 100 sv. 100 do 200 sv. 200 do 350 sv. 350 do 500 sv. 500 do 1500 chuguni 2,5…3,5 2,5…4,0 3,0…4,5 4,0…5,0 8,0…10,0 stali 2,5…4,0 3,0…3,5 3,5…6,0 5,0…7,0 8,0…12,0 alyuminievie 2,5…4,0 3,0…5,0 4,0…,0 4,0…7,0 7,0…10,0 magnievie 2,5…4,0 3,0…4,0 3,5…5,0 4,0…6,0 7,0…10,0 tsinkovie 2,0…4,0 2,5…3,5 3,0…4,0 3,5…5,0 7,0…10,0 mednie 2,5…4,0 3,0…4,0 3,5…5,0 4,0…6,0 5,0…7,0 bronzi olovyannie 1,5…2,0 2,0…3,0 2,5…3,5 …

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stenok pri perexode ot odnogo secheniya k drugomu doljno bit ne bolshe 4:1. pri sootnoshenii sopryagaemix tolshin s:s1 6. esli na detal deystvuyut udarnie nagruzki, to pri s:s1>2 perexodi vipolnyayut v vide klinovidnogo sopryajeniya (ris. 6.6). dlinu uchastka perexoda ot odnoy tolshini k drugoy prinimayut dlya otlivok iz chuguna, magnievix i alyuminievix splavov l>4 (sl1/s+l1) (6.2) dlya stalnix otlivok l>5 (sl1/s+l1) (6.3) ris. 6.6. sxemi vipolneniya odnostoronnix (a) i dvustoronnix (b) klinovix sopryajeniy. perexod ot tolstogo secheniya k tonkomu pri s/sj > 4 (ris. 6.6, b) osushestvlyayut s pomoshyu uchastka, dlinu kotorogo prinimayut ravnoy: dlya otlivok iz chuguna i tsvetnix splavov (6.4) dlya stalnix otlivok (6.5) pri uglovom sopryajenii stenok raznoy tolshini s sootnosheniem s/sj 2 perexod neobxodimo oformit, kak pokazano na ris. 6.8. dlya chugunnogo i tsvetnogo litya h=4c; dlya stalnogo litya h=5c. tri stenki sopryagayutsya po variantam a, b, v, kak pokazano na ris. 6.9. zdes: pri ; …

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lektsiya 6. texnologichnost litix detaley 6.1. osobennosti konstruirovaniya s uchetom liteynix svoystv splava 6.6. proektirovanie narujnix poverxnostey litix detaley. 6.3. proektirovanie vnutrennix poverxnostey otlivok 6.1. osobennosti konstruirovaniya s uchetom liteynix svoystv splava jidkotekuchest splava opredelyaet v konstruktsii detali vibor minimalnoy tolshini stenok neobrabativaemix poverxnostey. minimalnuyu tolshinu detali x, mm opredelyayut na diagramme (ris.6.1) v zavisimosti ot privedennogo gabaritnogo razmera n: (6.1) gde l, b, h - dlina, shirina, visota otlivki, mm tolshina vnutrennix stenok i reber prinimayut na 10...20% menshe tolshini narujnix stenok. u litix detaley tolshinu stenki neobxodimo naznachat s uchetom trebuemoy raschetnoy prochnosti, jidkotekuchesti splava i zap...

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