Hey, I thought this would be the best place to come to gather help and advice to working with Hardox as you seem to have produced some impressive results in regards to shaping it.
The problem is i'm working on a Uk bot and the design requires a cylinder ideally created from Hardox. But the obvious problem is how do I form Hardox plate into a pipe form. Only one builder I know of in the Uk has successfully bended hardox 450 using a home made 8 tonne bending rig which I am unable to replicate.
Also that was a larger radius than what I require, while Aus builder "bytraper" seems to have alot more success with his ring spinner, while it shows that it is possible it's takes alot of hassle. I've looked at other material alternatives but this really is my main option.
So my question is, is it possible for form a tube 250mm in dia and about 400mm long from Hardox and keep it balanced. If so how?
Regards,
Chris
Thu Mar 20, 2008 9:27 pm
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
it would depend on the thickness but i think bending it in that small a radius is starting to push the friendship.
I'm thinking about 5mm thickness, and i'm against any post treatment because of the metal warping and distorting. If it is possible I see the length being the problem.
Fri Mar 21, 2008 2:03 am
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
You are right, a ring might be possible but forming a tube would be really hard. Cold forming a ring made from a heat treated metal is usually done on a special machine (called a cold ring roller, strangely enough!):
To roll a tube you would need something like this:
My tip would be to find a heavy machinery supplier in the UK and ask them to recommend some place they have sold a large sheet roller to.
Balancing: I would try to balance the tube after is was completely fabricated (rolled, welded, etc) If it needs to be balanced, I assume it is going to be part of a vertical spinning drum weapon? I can post some pictures of a cheap static balancer I made that might work for you. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Fri Mar 21, 2008 6:42 am
Daniel Experienced Roboteer
Joined: 30 Aug 2005
Posts: 2729
Location: Gold Coast
Here's the Bisalloy hand book for bending and rolling. Bisalloy and Hardox are just brand names for the same grade of steel, like Lexan for polycarb.
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
I thought that Hardox was a laminated steel with a hard top and a softer backing. _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Hi,
You cant roll it in that shape.. Its not possible. It rolls, but it straight away springs back to 90% of its original shape. I've been down that road.
You can press it, but its almost impossible to get it balanced. or you can press roll it.. But that expensive because of the amount of time it takes and it cant be done in a single piece.
You may have to do what I did, and thats have it made in 2 pressed halves.
It was hard enough getting the diameter I wanted, anything smaller would require a HUGE press
But... you may luck out because they DID actually make the tubing in that diameter a long time ago for storm drains... They don't any longer because it wasn't viable but you still might be able to get some offcuts from some of their distributors ?
Cheers!
Mon Mar 31, 2008 11:39 am
Knightrous Site Admin
Joined: 15 Jun 2004
Posts: 8511
Location: NSW
Getting 6mm bent seems pretty nuts, I'll eventually get around to sending a bit of 3.2mm Hardox to the local engineering crew to have a crack at bending.
Paul Cooper shaped the stuff with a homemade bending unit to make the curved armour for M2XT.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum