塑料模具设计习题与答案（Design problem and answer of plastic mould）.docVIP

塑料模具设计习题与答案（Design problem and answer of plastic mould） Plastic mold design problem Chapter 2 which of two most ion, good wear-resisting performance is good  vibration sound, 6 low thermal conductivity  some plastic has good optical properties. What kind  2-2 plastic additives have what role each  1, 2, plasticizer reduced the force between the polymer molecules stabilizer to prevent or inhibit resin external factors such as heat, light, oxygen and mold role and produce quality variation and performance degradation, curing agent Prompt synthetic resin crosslinking reaction to form a mesh structure size or speed up the crosslinking reaction  general multi-purpose in thermosetting plastic. 4, filler Can reduce the precious resin content  reduce cost. 5, stain plastic parts get  beautiful colour and lustre is beautiful and pleasant  improve the quality of plastic parts. 2-3 what are thermoplastic and thermosetting plastic   essentially what difference Thermoplastic synthetic resin is linear or a polymer with branched linear structure. The synthetic resin of thermosetting plastics is a polymer with a mesh structure. Difference between thermoplastic plastics can be repeatedly heating   and usually only physical change in the process of forming  and thermosetting plastic in the heating process is both a physical change and chemical change  and change process is not reversible. 2-4 describe what are thermoplastic physical state  characteristics and the relationship between processing method  (1)  glass state can be used as structural materials for file   drill   milling and other mechanical processing. 2 bending   high elastic state for blow molding  extended  vacuum forming  after molding, stamping and other  internal pressure is bigger. (3) viscous state   extrusion can be injection  calender  moulding,  small internal stress after forming. 2-5 polymer melt viscosity change with shear rate what implications of plastic molding processing 