A NC turning process will be done in two cutting passes to a drive shaft. of material steel, 42CrMo4 - AISI4140, working

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A NC turning process will be done in two cutting passes to a drive shaft. of material steel, 42CrMo4 - AISI4140, working in a cycle that runs automatically. The operator is the one who pre-aligns the machine for the work. The initial diameter of the shaft is 8 in and its length is 25 in. The operation plan consists of the following steps: The operator loads the part into the machine, starts the cycle (1.5 min); 2. The NC lathe positions the tools for the first step (0.4 min); 3. The NC lathe machines the first step (time depends on the cutting speed); 4. The NC lathe repositions the tool for the second step (0.5 min); 5. The NC lathe machines the second step (time depends on the cutting speed); 6. The operator unloads the part and places it on the carriage (2 min). In addition, the cutting tool is a cerment material insert, and it must be changed periodically and this tool change takes 2 min. The feed rate is 0.015 in/rev and the depth of cut for each step = 0.30 in. The operator cost v machine cost = $100/hr v tool cost = $20/cutting edge. Determine; a) the cutting speed to minimize the cost per part D) the average time required to complete a production cycle c) the cost of the production cycle. If the total setup time for this job is 8 hr and the batch size is 1000 pieces how much time will be required to complete the batch?

A Nc Turning Process Will Be Done In Two Cutting Passes To A Drive Shaft Of Material Steel 42crmo4 Aisi4140 Working 1 (16.36 KiB) Viewed 24 times

TABLA 23.2 Valores representativos de ny C en la ecuación de la vida de las herramientas de Taylor, ecuación (23.1), para materiales seleccionados de herramienta. с Corte sin acero Corte con acero Material de herramienta m/min ft/min fumin Acero para herramienta 0.1 70 (200) 20 60 simple al carbono Acero de alta velocidad 0.125 (350) 70 200 Carburo cementado 0.25 900 (2700) 500 1500 Cermet 0.25 600 2000 Carburo recubierto 0.25 700 2200 Cerámico 0.6 3000 10000 m/min 120