there are over 40,000 materials and over 1,000 ways to process them Source: Djassemi, M. “A Computer-Based Economic Analysis for Manufacturing Process Selection”, 2008
selecting the processes by which a particular artifact is manufactured is complicated!
You are a member of design team trying to develop and launch a new product. You need to evaluate how (and whether) you can make the product economically. or do you need to make changes before the product can be profitable to sell?
What are some things you’d need to know about potential manufacturing processes in order to decide? Spend a few minutes thinking about it, and write down your thoughts.
pair – share what are some things you’d need to know about the mfg processes?
what are some attributes of an artifact that might influence the mfg process that was used to make it?
key artifact attributes what is it made out of? how many do we want? what shape is it? what size (e.g., mass) is it? how important are dimensions? how smooth is the surface? what are the wall thicknesses?
shapes some processes can make only simple shapes, others, complex shapes. not easy to quantify/describe shape.
shapes wire drawing, extrusion, rolling casting, molding, powder methods stamping, folding, spinning, drawing From New approaches to Materials Education - by Mike Ashby & David Cebon, Cambridge, UK, 2008
how many? imagine your task is to sharpen pencils.
how many? how would your process change as you moved from sharpening 10 pencils to sharpening millions of pencils?
dimensions tolerance = how important it is that dimensions are met. no process can meet an exact dimension what do you think tighter tolerance does to cost?
dimensions what do you think tighter tolerance does to cost? think of some general cases in which tolerances might be more important
come get two or three artifacts from the table + pick one thing from your backpack
describe each of the artifacts in terms of their key attributes (that influenced how they were made)
for each artifact… what is it made out of? about how many do we want? what shape category is it? what size (e.g., mass) is it? how important are dimensions? how smooth is the surface? what are the wall thicknesses?
report out share the description of one of your team’s artifacts
presentations you’ll each give a 15 minute presentation on one process to your teammates. your specific process will be assigned. process assignments are posted on blackboard under Assignments Competency Assignments Competency Assignment 5
assignments Practice Assignments PA 9: ID mfg-related attributes (due 9/25) PA 10: draw the dental floss (9/25) posted on blackboard under assignments practice assignments Upcoming Competency Assignments CA 5: mfg process presentation (due 10/2) posted on blackboard under assignments competency assignments