Press Brake Flashcards
When forming an inside dimensions we must add ?
20%
When forming an outside dimension we must subtract ?
80%
What is the most accurate to determine bend allowances ?
Trial bend on material being used
On thicker materials a larger radius should be used. Why?
Cracking
2 methods of forming on a press brake ?
Coining/ bottum bending
Air bending
Advantages for coining, bottum bending, and air bending ?
Coining- most accurate
Bottum bending -produces sharp corners with accuracy
Air bending- requires least amount of tonnage, vast types of forming,
Disadvantages of coining, bottum bending and air bending ?
Coining and bottum bending
- requires high amounts of pressure
Air bending - less accurate
The die opening for 16 ga should be atleast ____________ times the metal thickness
8 times out of
How is spring back compensated for ?
Slightly over bend
Clearance between punch and die can decrease
What can be done to minimize irregularities caused by deflection ?
Shimming under the die
What die can be used to form an unlimited number of shapes ?
Rubber or urethane rubber dies
Advantages and disadvantages
Of rubber dies
Advantages
-unlimited shapes
- not much scuffing ir marking
-set up time is reduced because lower die change is eliminated
Disadvantages
-more power
-rubber dies deteriorate much faster
-high cost to replace
Name the die’s used to eliminate marks and scuffing when forming ?
Roll form or rotator dies
Can a radius be formed with roll forming rotator dies ?
Yes, combined with a punch having a radius
If die opening changes, the amount of pressure required to complete the bend will change. Explain how this works ?
Smaller the v opening on die higher tonnage required larger the v opening on die the less tonnage that is required
Press brakes are rated in _________ of pressure.
Tonnage
Aluminium should have a bend radius of ________ times the material thickness ?
3-5
3 I believe is correct
