Exam (elaborations)
Parcial de diseño de máquinas 2 UIS
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Parcial resuelto de la asignatura diseño de máquinas 2 de la universidad industrial de Santander
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UNIVERSIDAD INDUSTRIAL DE SANTANDERESCUELA DE ING.MECANICA
DISEÑO DE MAQUINAS II
PROF. GILBERTO PARRA
SEP 21 2020.
120 CMS
100 CMS
20 mm
18 mm
Empaque
80 CMS
P=0…2,2 Mpa
El esquema nos muestra un cilindro de diámetro interior de 80
cms el cual tiene una presión que varía desde P= o hasta
P=2,2 Mpa; la junta consta de tornillos MF 24x 2 D X 50 X 40
hex, grado 10.9 ubicados según se muestra en la figura en un
diámetro de 120 cms, y un empaque de cobre asbesto.
La tapa de la junta es de acero y el cilindro de fundición.
Determine:
a.- El número de tornillos de la junta.
b.- La precarga
, c.- El factor de seguridad para 600.000 ciclos de carga.
1.-. hallare las propiedades mecánicas del tornillo
MF 24x2 D X50X40 hex, grado 10.9
Grado 10-9 Sut= 1040 Mpa=150472 psi Sy=940 Mpa
Sp=830 Mpa.
2,- Hallaremos la carga externa máxima y la mínima
F etotal maxima = pmax x A
2 2
Nt πx 800 mm
F etotal maxima =2,2 x =1105840,6 Nt
mm 2 4
F etotal min = pmin x A
F etotal min =0
3.- Hallo el número de tornillos.
Si la presión p> 200 psi =1,38Mpa; tómese 2,5 d ≤ p ≤3,5 d
Donde p es la distancia entre cada tornillo
Tomamos p=3,5d=3,5 x 24=84 mm.
Long∘=π D= p x N t
π D πx 1200 mm
Nt= = =44,87
p 84 mm
Tomo N t =45 tornillos
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