2018 sheet metal processing terminology ultimate teaching material (2)

Perforation: also known as “turn over”, refers to the process of round hole flanging forming of the workpiece with die on the ordinary punch or other equipment.It is to refer to use the ordinary punch, add special mold to carry on the need to increase the thickness of tapping, when the craft engineer makes the craft, he must add careful specification on aperture and quantity.
Drilling: refers to the use drilling machine for drilling, when it is not convenient for CNC punch and normal punch to process, using artificial to finish small amounts processing, normally draw the line and positioning the drilling point for drilling process, process engineers should use this process less.
Die Plate Drilling: it means to process a piece of plate with a number of punches, and then use the positioning method to conduct batch drilling.
Tapping: the process of processing internal threads on the workpiece.
Broaching: the process of machining a small hole into a large hole with a drill or milling cutter.
Countersink: the process of machining a taper hole in the workpiece to fit a connecting piece like a countersunk head screw.It is refer to use drilling machine, use the appropriate drilling head (90 degrees, 120 degrees), have to use the countersunk screw to make a real match, normally, leveling the surface of countersunk head screws and the surface of workpiece sink holes, producers must use real match method.
Pressure Riveting: the process of pressing the riveting nuts, riveting screws or riveting nuts to the workpiece by punch press or hydraulic press.Normally, the direction of the pressure riveting is in the direction of the burr, so that the pressure riveting can be loaded smoothly. If not, the producer should report it in time.
Rose Riveting: refers to the process of pressing the workpiece to the hole first and then using the punch or hydraulic press to press the riveting nut firmly to the workpiece.Pull Rivet Nut: refers to the process similar to riveting. Using a rivet nut pull shot to pull rivet nut (POP) and other connectors firmly connected to the workpiece.Pull riveting: the process of connecting two or more workpieces closely together with a riveting gun.