The blanking technology of the titanium alloy forging

                         Forging of titanium alloy forging (rolling) rods Titaniumcn, the alpha layer of the surface with a layer of hard brittle, die forging, need to get rid of this layer, so as to avoid forging billet caused by surface cracking.For less than 50 mm diameter rod, need to remove the surface layer of 3 mm thick, diameter greater than 50 mm, need to get rid of 5 mm.For extrusion bar, less than 50 mm diameter, can be car to 2 mm, greater than 50 mm in diameter, generally to 3 mm.After cutting, there are still defects, such as individual site, partial grinding can be eliminated, the grinding depth should not be greater than 0.5 mm.

Definite size titanium alloy forging blank available anode cutting machine, sawing machine, lathe, punching and shearing machine, grinding wheel cutting machine or cutting on the forging hammer or hydraulic press.The highest efficiency in the punching and shearing machine.
(1) the thickness of the disk saw cutting disc saw blade between 2 ~ 8 mm, suitable for cutting bar diameter is larger.Disk saw the linear velocity of about 30000 ~ 35000 mm/min, the feed amount of hours to get a clean face.To prevent metal bond tools, metal burns, can use suspension to reduce friction, cooling cutting tools.
(2) the cutting of titanium alloy anode, mechanical cutting, incision width of no more than 3 mm, with a concentration of 1.28 ~ 1.32 g/cm3 water as working fluid.Although anodic cutting cut cost less, but less rate is low.
(3) before the hammer or hydraulic press for cutting cutting, bar should be preheated to deformation began cutting temperature (or chop).Pure titanium in punching and shearing machine cold shearing.
(4) lathes cutting of titanium alloy car cutting, cutting speed should be within 25000 ~ 30000 mm/min, feed quantity is 0.2 ~ 0.3 mm/week.
Scalping remove the alpha layer, car to specification: the cutting rate of 15000 ~ 20000 mm/min.No alpha layer when turning the standard related to surface roughness: when the roughness Ra = 0.63 ~ 2.5, feed quantity is 0.08 ~ 0.1 mm/week;Ra = 1.25 ~ 5, the feed quantity is 0.1 ~ 0.2 mm/week;When Ra = 2.5 ~ 10, feed quantity is 0.3 ~ 0.4 mm/week., turning processing must be used when the lubricating coolant supply 1 ~ 1.5 MPa pressure.
(5) grinding wheel cutting of titanium alloy rod diameter less than 60 mm, appropriate is used grinding wheel cutting.When the diameter of the grinding wheel cutting more than 20 mm, should use the cooling fluid.Grinding wheel cutting efficiency is higher, but the life of the grinding wheel piece is shorter.
Blank after cutting, end of the acute Angle should be round.Otherwise end forging or heading on horizontal forging machine, may cause folding.The blank diameter of less than 50 mm, acute Angle round radius R is 1.5 ~ 2.0 mm;The blank diameter of more than 50 mm, acute Angle round radius R is 3 ~ 4 mm.