Under normal circumstances, the main problem road calculus mold steel working parts of the data, any mold problems have a certain reason. Improper selection, poor data performance, do not wear, tool steel, without refining, smelting with a large number of defects, process is imperfect, there remains hidden heat. Or die structure design problem, discharge power Ambassador punch accept alternating load increased and so on. Molding process is imperfect, heat treatment technology and process problems, soft spots and uneven hardness, the occurrence of micro-cracks, even cracking, grinding and polishing is not in place, the appearance of roughness. Road calculus steel mold, mold steel road calculus is molding mold plastic mold failure analysis can better guide the development of mold, plastic mold failure modes are: wear and corrosion cavity surface, the plastic melt to a certain The pressure in the mold cavity flow, solidification of the plastic parts from the mold, the outer molding will cause friction, causing wear. Plastic reinforced resin filler, will take place the appearance of mold cavity erosion, abrasion and corrosion. Meanwhile plastics processing chlorine, fluorine and other ingredients thermal decomposition of the plastic deformation failure HClHF corrosive gas, plastic mold cavity surface pressure, heat can cause plastic deformation failure, especially when working on a small mold large tonnage equipment, more prone overload plastic deformation. Lack of information using the strength and toughness of plastic mold materials, deformation resistance is low. Plastic mold cavity surface hardened layer is too thin, the deformation resistance or lack of working temperatures above the phase transition temperature tempering softening. Broken plastic mold, plastic mold complex shapes many corners, thin-walled and other parts, these parts of the local stress concentration occurs breakage. Structural stress generated by the difference in temperature, thermal stress or due to lack of tempering, under temperature, residual austenite into martensite, causing local volume expansion, the stress caused by the occurrence of an internal mold.