Transfer lines Text solution

Page 1

01. Transfer Lines exercises 1 E XERCISE 1 A company organized the production of their goods with the typical layout of the transfer line . The follow ing coefficients were estimated : - Line Availability = 0,9 5 ( due to failures, p reventive maintenance is planned when the line is not required by production ) - Scrap Rate = 0, 0 4 - The line realizes one type of product, P1. The annual demand is 30000 pieces/year . - The line is composed of 3 stations (M1, M2, and M3) The time required to setup betwe en each production campa ign is 2 hours . The products are always produced in quantities of 6000 pieces each, independently of annual demand. 7 operations are required, in order to realize the product P1. They are reported in the following table . Operation s A B C D E F G h/piece 0.1 0.1 0.1 0.3 0.05 0.15 0.1 Operations are sequential (A - > B - > C - > D - > E - > F - > G) The line is a synchronous transfer line . It is requested t o evaluate the theoretical production capacity of the line and the actual production capacity of the line . 1.1.1 Solution We have to define the total work content = = = 0 , 1 + 0 , 1 + 0 , 1 + 0 , 3 + 0 , 05 + 0 , 15 + 0 , 1 = 0 , 9 / We assign the operations to them , so we divide the total work content by 3 - > , = 0 , 3 / Sequential method: - M1 = A + B + C = 0,3 h/pieces - M2 = D = 0,3 h/pieces - M3 = E, F, G = 0,3 h/pieces From this configuration we can see that the maximum duration of our stations is 0,3, because they are completely balanced - > = 0 , 3 / = 1 = 1 0 , 3 = 3 , 3 / = ( 1 ) = 3 , 3 0 , 95 ( 1 0 , 04 ) = 3 , 04 / (not required) We calculate the value of the needed hours in order to understand the needed number of lines; in this case we can’t calculate it because we don ’t know the data needed to calculate the Available…