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发表于 2007-11-1 20:49:24
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! @4 g! l m0 I7 HCold forging: various forging processes conducted at or near ambient temperatures to produce metal components to close tolerances and net shape. These include bending, cold drawing, cold heading, coining extrusion (forward or backward), punching, thread rolling and others.1 O) J4 e" G& z
! {6 J8 G- k: @3 F, [Cold heading: plastically deforming metal at ambient temperatures to increase the cross-sectional area of the stock (either solid bar or tubing) at one or more points along the longitudinal axis. |
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发表于 2007-11-1 20:26:36