We have an exciting announcement about badges coming in May 2025. Until then, we will temporarily stop issuing new badges for course completions and certifications. However, all completions will be recorded and fulfilled after May 2025.

Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › Metal forming （spinning） › Reply To: Metal forming （spinning）

May 23, 2024 at 12:59 pm
ZHAO Te
Subscriber

I'm very sorry for not explaining this issue clearly.

Working condition: Blank and die are connected by *Constrained_EXTRA_NODES-SET. The blank is formed through multiple processing steps by wheel.There are some issues here.

SECTION A:

1、Normal circumstances:Rotating wheel speed 628 rad/min (100r/min), wheel feed rate 40mm//min. The following is the result of my simulation.

This is a normal phenomenon.

2、However, When I adjusted the speed of the die to 3140rad/min (500r/min), the wheel speed remains constant. After being in contact with the wheel for a period of time, the blank detached from contact with the spinning wheel and deformed itself.( Blank,-press down on his own) This is seriously divorced from the facts.

3、At that time, I thought the speed was given too fast, so I maintained a speed of 628 rad/min (100r/min), The wheel speed has been slowed down to 8mm/min. But there are still issues with situation 2, except that the amplitude of deformation of the sheet metal itself decreases.

4、At 500r/min, the blank showed outward drift, but the experimental blank did not show any outward drift. Why does this phenomenon occur ?

I want to know, Wheel, without putting pressure on Blank, What is the reason for Blank's own deformation. At present, I speculate on my own whether it is related to dynamic relaxation phenomenon.But this problem has been bothering me for a long time and has not been solved yet.