1 for the screw tail and deceleration box spindle into the situation of floating joints, because screw in the barrel floating, screw weight caused by bending stresses equal to zero, so only by the screw under compressive stress and shear stress to calculate.
2 due to the screw weight caused by the bending stress is very small (screw around the material filled), even in the former case, can be omitted, so the two methods are actually the same.
3 also has the torque to estimate the screw diameter.
The usefulness of the screw
More used in plastic molding equipment, such as plastic profiles extrusion machine, injection molding machine. Screw and barrel are the core components of plastic molding equipment. Is the part of heating extrusion molding. Is the core of plastic machinery.
Screw is widely used in machining centers, CNC machine, CNC lathe, injection molding machine, wire cutting, grinder, milling machine, walking wire, fast wire, PCB drilling machines, carved machine, engraving and milling machine, spark discharge machine, bite tooth machine, planer, large vertical car dragon Men Yuan and so on.