MAE 364 - 1 - Fundamental of Metal Forming
What is a die?
A die a tool that is used to apply stresses that exceed the yield strength of the metal; the metal takes the determined by the geometry of the die.
What is another name for sheet metal working?
Another name for sheet metal working is pressworking.
What is bulk deformation?
Bulk deformation is characterized by significant deformations and massive shape changes for work parts with relatively low surface area to volume ratios.
What are some desirable material properties?
Desirable material properties: - Low yield strength - High ductility
What is the temperature range for cold working in metal forming?
For cold working, the temperature range is around room temperature or just slightly above.
What is the temperature range for hot working in metal forming?
For hot working, the temperature range is between 0.5*Melting Temp to 0.75*Melting Temp
What is the temperature range for warm working in metal forming?
For warm working, the temperature range is between 0.3*Melting Temp to 0.5*Melting Temp
What is undesirable in most metal forming processes and why?
In most metal forming processes, friction is undesirable. Friction can: - Reduce metal flow - Increase forces and power - Wear tools faster
What are the basic categories for metal forming processes?
Metal forming processes can be classified into two basic categories: 1) Bulk deformation processes 2) Sheet metal working processes
What is metal forming?
Metal forming refers to a large group of manufacturing processes in which plastic deformation is used to change the shape of the metal workpieces.
What is sheet metal working?
Sheet metal working is the forming and other related operations performed work parts with high surface area to volume ratios.
What are some examples of bulk deformation processes?
Some examples of bulk deformation processes are: - Rolling - Forging - Extrusion - Wire and bar drawing
What are some examples of sheet metal working processes?
Some examples of sheet metal working processes are: - Bending - Deep drawing - Shearing
What are some examples of work parts used in bulk deformation?
Some examples of work parts in bulk deformation include: - Cylindrical billets - Rectangular bars
What are some examples of work parts used in sheet metal working?
Some examples of work parts in sheet metaling working include: - Metal sheets - Strips - Coils
What are some factors in choosing a lubricant for metal forming?
Some factors include: - Type of forming process - The type of working (hot or cold) - Work material - Chemical reactivity with tool and work metal - Ease of application - Cost
What kinds of stresses are used to plastically deform the metal?
Stress to plastically deform the metal are usually compressive, but there are other forming processes that apply tensile and shear stresses as well.
What material properties does temperature affect and how?
Temperature affects: - Strength - Strain hardening - Ductility As the temperature increases: - Strength decreases - Strain hardening decreases - Ductility increases
What are the parts in sheet metal working called?
The parts are called stampings.
What are the usual tooling in sheet metal working?
The usual tooling are punch and dies.