Engineering & Technology Mechanical Engineering In the figure, the nut is rotated in the schematic mechanical jack and the load F is raised to the maximum H stroke. Screw type and type; Tr 48x8...

Document Content and Description Below

Question Answered step-by-step In the figure, the nut is rotated in the schematic mechanical jack and the load F is raised to the maximum H stroke. Screw type and type; Tr 48x8 (tooth bottom diamete ... r dd = 39 mm, average diameter d2 = 44 mm). Slide or roller bearing will be used where the nut is supported on the jack body. - Friction coefficient of 0.15 for screw threads, - friction for the pair of bushing (plain bearing) type bearing and jack body coefficient 0.12, - friction is 0.05 for the roller-type bearing and jack body pair. Bushing and rolling bearing average friction diameter will be taken as do = 1,4d depending on the trapezoidal size. Arm force Fkol = 700 N, Eçelik = 206850 N / mm2 for ball screw, Load, F = 53500 N Force application distance, L = 433.9 mm Screw materials, 235 MPa (S235JR) a) Calculating the safety coefficients and L slewing arm lengths for the use of the plain bearing (bush) and rolling bearing (bearing) in the working conditions of the screw shaft in the jack b) Calculate the buckling force of the screw shaft and the buckling safety coefficient under working condition. (h (lambda) critical = 80 will be accepted) c) Calculate the number of threads by sizing the nut (Pem = 15 N / mm2 for the nut) d) Draw the production drawing of the screw shaft and nut in 1: 1 scale, in accordance with the TECHNICAL DRAWING rules. 2 Kriko.png 3 civata.png Image transcription text Bolt Connections F, =Fontg(B+ p') M Stop = M s + M SA M s top = Fon dzig( B + p' ) + Ho 2 do F do =1,4d LL zx.d .a.h 2 COST F tan B for trapezoidal screw: a=0,65 m = z.h = h 1 = tan (B + p) for square screw a= 0,5 (a2 - d? )Pam for triangle screw : a= 0,78 M s for triangle nut : a= 0,85 = = Fon Ib max A1 W b F = (0)+4(1) 50Bem = Pem m = z.h OB DEX F F P= Pmax = F Pem n.s.G z. n d2.12 n.m.AG Flop = Fon + Fic Fon = Fon Fis = N( k + k,) k Fip F.= Fisk +kp F on _ E.Ac ko = tge = Fonz Ep. Ap k K = S Lp Fic = Fisk, the Fon value in terms of strength, Fon=0,85*oak*Al Fon value in terms of sealing condition Fon= 4 * Fis 2 Flambaj.png 3 Civata tablosu.png Image transcription text TS61/1 Metric Bolt Table metric screw P inner screw normal 60 thread table TS 61 / DIN 13 N outer screw O screw nominal root diameter step section tooth height diameter drill Ded outer screw | inner screw P diameter diameter 12=D2 outer screw inner screw di D1 h3 H1 M1 0.25 0.693 0,729 0,75 1,638 0,153 0,135 M2 0.40 1.509 1,567 1,00 1,740 0.245 0,217 M3 0,50 2,387 2,459 2.50 2,675 0,307 0,271 M4 1.70 3.141 3,242 3,30 3.545 0.429 0.379 M5 0.80 4.019 4,134 4.20 4,480 0,491 1.443 M6 1,00 1,773 4,917 5,00 5,350 0,613 1,541 MS 1,25 5.466 6,647 6.80 7,188 1,767 0,677 M10 1.50 3,160 8376 3,50 9,026 0,920 0.812 M12 1,75 9,853 10,106 10.20 10,863 1,074 0.947 M14 2,00 11,546 11,835 12.00 12.701 1,227 1.083 M16 2,00 13,546 13,835 14,00 14,701 1,227 1,083 M18 2,50 14,933 15.294 15.50 16,376 1.534 1,353 M20 2.50 16,933 17,294 17,50 18.376 1.534 1,353 M22 2,50 18,933 19.294 19.50 20,376 1.534 1,353 M24 3.00 20,319 20,752 21,00 22,051 1,840 1,624 M27 3.00 23,319 23,752 24,00 25,051 1,840 1,624 M30 3.50 25,706 26,211 26.50 27,727 2,147 1,894 M32 3,50 28,706 29,211 29.50 30,727 2,147 1,894 M36 4,00 31,093 31,670 32.00 33,402 2,454 2,185 M39 4,00 34,09 34,670 35,00 36,402 2,454 2,165 M42 4.50 36,479 37,129 37.50 39,077 2,760 2.436 M45 4.50 39,479 40,129 10.50 42,077 2,760 2,436 M48 5,00 41,866 42.587 43,00 44.752 3,067 2,706 M52 5,00 45,866 46,587 47,00 48,752 3,067 2,706 Notch factor in norm stress : For bolts manufactured by chip removal method K=2,8:3.8 For bolts manufactured by rolling K=2.2:3,0 [Show More]

Last updated: 3 years ago

Preview 1 out of 7 pages