Definitions:
to rivet = to hammer in order to form into a head
(various dictionaries)
e.g. see
http://www.thefreedictionary.com/rivet
to splay = to make slanting or sloping ~ to bevel ~ скашивать, снимать фаску
http://encyclopedia2.thefreedictionary.com/Splay
to peen = to hammer, bend, or shape with a peen
http://www.thefreedictionary.com/peen
Peening = 1. The flattening or shaping with a peen hammer. 2. The stretching of metal by hammering or rolling the surface
http://www.motorera.com/dictionary/PE.HTM
peen (noun) = the working face of a hammer opposite the flat face, usually shaped for bending, shaping, or cutting the material being struck with the peen
http://www.contractorreferral.com/glossary/index.php?letter=...
see also Cross Peen, Ball Peen, or Straight Peen Hammers in the same Construction Glossary
Please note that only the verb 'to rivet' has the exact specific meaning of 'to form into a head' (i.e., into a rivet-like shape), whereas 'to peen' and 'to splay' don't
The translation workplace 
peer agreement (net): +2
