Billet de-scaling before forging
Billet de-scaling before forging
(OP)
Hi all,
we are looking for an effective method of billet de-scaling or protecting coating to minimise the scaling of the billets before forging.
our forging temp is normally around 1200C (steel). currently we are using rotary de-scaler which same as the coatings we use is not very efficient.
has anyone have any experience to share?
Thank you in advance.
we are looking for an effective method of billet de-scaling or protecting coating to minimise the scaling of the billets before forging.
our forging temp is normally around 1200C (steel). currently we are using rotary de-scaler which same as the coatings we use is not very efficient.
has anyone have any experience to share?
Thank you in advance.





RE: Billet de-scaling before forging
http
http://www.renite.com/metal-sum.htm
RE: Billet de-scaling before forging
RE: Billet de-scaling before forging
Wrenchbender, our billets are not necessarily big to maintain the heat loss due to the air blast, do you probably know how much is the temperature drop?
RE: Billet de-scaling before forging
RE: Billet de-scaling before forging
RE: Billet de-scaling before forging
I have seen lots of methods proposed and used. Most of them employing a air blast. A previous employer looked at a high-pressure/low volume water (2-4 KSI) system, but did not purchase it. The two most common methods I've seen are either the "do nothing method", where you do nothing and just deal with the result by adding extra material to the forging dimensions, or the "bump and blast method" where the material is given a brief upset by the press accompanied by a high pressure air blast prior to the forging operation. The loss in temperature is kept to a minimum by limiting the duration of the air blast.
I have also heard of protective atmospheres and other techniques that I guess have been successful for some materials, but I believe their cost is prohibitive for steel forgings. It's just cheaper to deal with the consequences.
rp
RE: Billet de-scaling before forging
It works because you force water under the scale and then let the steam blow it off.
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Plymouth Tube
RE: Billet de-scaling before forging
rmw