Embedded Files
Wasting Processes
Wasting Processes
Wasting processes shape the object or component by the removal of material.
It is a subtractive process which, in some circumstances can be very wasteful. Some materials such as metals and polymers may be able to be recycled but the waste from wood cannot always be used to make products.
These are the processes available but not all are suitable for the full range of materials, for example chiseling is not suitable for plastics.
They are presented here in order of the typical amount of waste produced but this is only a guideline. For instance, drilling a very large hole could remove more waste than turning a small piece of wood.
Milling (Metal and Plastic)
Milling (Metal and Plastic)
Milling is the machining process of using rotary cutters to remove material. Traditionally a milling machine would have cutters that could be moved in three axis and operated manually but with the advent of CNC machining the same procedure is computer controlled allowing for more complex shapes to be produced.
How Apple use CNC milling to make the Macbook unibody
Punching
Punching
Punching is a metal forming process that uses a punch press to force a tool, called a punch, through the work piece to create a hole via shearing. The punch often passes through the work into a die. A scrap slug from the hole is deposited into the die in the process. Depending on the material being punched this slug may be recycled and reused or discarded. Punching is often the cheapest method for creating holes in sheet metal in medium to high production volumes. When a specially shaped punch is used to create multiple usable parts from a sheet of material the process is known as blanking.
Blanking and PiercingÂ
Blanking and PiercingÂ
Blanking and piercing are shearing processes in which a punch and die are used. The tooling and processes are the same between the two, only the terminology is different: in blanking the punched out piece is used and called a blank; in piercing the punched out piece is scrap. The process for parts manufactured simultaneously with both techniques is often termed 'pierce and blank'. An alternative name of piercing is punching (see previous slide).
Page updated
Report abuse