Huo Flashcards
Basic manufacturing processes
Primary shaping
Secondary shaping
Joining and assembly
Surface treating
Primary shaping examples
Casting
Molding
PM methods
Secondary shaping examples
Forming
Machining
Joining and assembly examples
Welding
Adhesives
Fasteners
Surface treating
Heat treatment
Surface treatment
Painting
Definition - machining
A subtractive manufacturing process in which excess material is removed until only the desired final geometry remains
Conventional machining
A sharp cutting tool used to mechanically cut the material to shape
Non-traditional machining
Uses various energy forms to remove material
What is machining usually used for?
Finishing process
Conventional machining examples
Turning Drilling Milling Grinding Etc
Non-traditional machining examples
Electrochemical machining
Thermal energy processes
Chemical machining
Etc
What materials can be machined?
Metals - most common Polymers Ceramics Composites Natural materials
Special part shape in machining examples
Screw threads
Accurate round holes
Very straight edges and surfaces
Benefits of machining
Variety of materials can be machined
Variety of part shapes and features possible
Good dimensional accuracy and surface finish
Disadvantages of machining
Wasteful of material
Time consuming - longer than casting and molding
Machining in manufacturing sequence
- Usually performed after other manufacturing processes ( casting, forging), which create the general shape of the starting work part
- Machining - secondary processes and final process
Most common machining processes
Turning
Drilling
Milling
Less common machining processes
Shaping and planing
Broaching
Sawing
Turning
Single point cutting tool removes material from a rotating workpiece to form a cylindrical shape
Lathe or turning machine
Drilling
Used to create a round hole using a rotating drill bit, usually with 2 cutting edges
Smaller diameter - faster
Only feed in one direction
Milling
Rotating multiple cutting edge tool is moved across work yo cut a plane or straight surface
Peripheral milling
Rotational axis is parallel yo the cutting surface
End/face milling
Rotational axis is perpendicular to the cutting surface
Cutting parameters in turning
v = cutting speed (m/s) ft = Feed rate (mm/min) d = depth of cut (mm)
Feed per revolution -
f=(ft/N)(mm/rev)
N= rev/min
Material removal rate, MRR -
MRR = vfd (mm^3/s)
