Influence of process parameters on tribological behaviour of AA7075 in hot stamping

Die Material Selection Criteria for Aluminum Hot Stamping

“…The frequency has been chosen to resemble the average sliding speed between a die radius and a hot stamped sheet in a contact radius of an omega profile of a servomechanical press 100 mm/s. Although it is several orders of magnitude over the value employed in some references [26,27], this value fits with most works in the checked literature 25-100 mm/s [2,3,15,16,20,21,25].…”

“…The contact load has been selected to match a 10 MPa pressure, which is a usual average pressure in hot stamping. Some authors have employed similar values in their studies 5-20 MPa [2,3,16], while others have performed the tests at much higher values [15,18,21], up to 810 MPa.…”

“…In consequence, the automotive sector, which is the industrial application where hot stamping is most implanted, uses extensively hot work tool steels. Hot stamping die related friction and wear have been studied extensively employing hot work tool steels, with 1.2343 [12][13][14][15][16], 1.2344 [17][18][19][20][21][22][23], and 1.2367 [18,24] as the most frequent choices. Some have been also employed for aluminum coated steel hot stamping [20], together with proprietary steels such as Toolox ® 44 from SSAB [21], QRO90 ® Supreme from Uddeholm [2,25], or W300 ® from Böhler [4].…”

“…• reciprocating pin-on-disk [2,3,26,27], • reciprocating ball-on-disk [20], • regular ball-on-disk [13][14][15]18,21,27], • block-on-ring [17], • hot strip drawing [4,16,[22][23][24][25], • cross cylinder [19], • block-on-cylinder [13], • and top hat drawing test [27].…”

“…• 1XXX (alloy 1099 [18]), • 2XXX (alloys 2014 [17], 2017 [20], and 2024 [17]), • 6XXX (alloys 6016 [4], 6060 [19], and 6082 [15,21,26,27]) • 5XXX (alloy 5083 [17]), • and 7XXX family (alloys 7075 [16] and 7475 [14]).…”