HDPE pipe bending forces

[Rockerdj]

Hi all

I am designing 3d (3 x diameter) & 2d (2 x diameter) bending
press for HDPE pipes, the pipes are heated to 2500 deg C where after they are filled with pellets to keep the pipe's shape during bending, can anyone help me with force required to bend the pipes.The pipes sizes are 110mm up to 1000mm. The pipes are bent tyo 90 deg. Please help

 

[patprimmer]

The polymer will not only be melted at 2500 deg C, it will be vaporised.

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

http://eng-tips.com/market.cfm

for site rules

 

[Rockerdj]

my apologies it is 250 deg C

 

[patprimmer]

All grades of HDPE I am aware of melt at 235 deg C or less You will need to thermoform at less than 200 deg C I expect. The force required will depend on temperature and will be very low to almost nothing, like by its own weight maybe.

Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &

http://eng-tips.com/market.cfm

for site rules

 

[Pud]

If it's a cross linked material (e.g. gas pipe) you may not do it at all.

H

http://www.tynevalleyplastics.co.uk

Why be happy when you can be normal?