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Injection mold parts damage causes and prevention methods
article source:  Executive editor:Yizezhi  View:2017  Publish time:2015-05-14
 The cause of damage of injection mold parts: in injection mould parts manufacturing, mold damage is the most common form of crack, crack. Stress is a major cause of lead to mold damage. Thermal, mechanical, chemical, operation impact is the source of stress, including mechanical stress and thermal stress, the stress generated by:
(a) In the process of injection mold parts processing and manufacturing.1, the blank forging quality problems.Some mould only produced hundreds appear crack, and crack developing very quickly.Is probably the only when forging to ensure the appearance size, and the dendritic crystals and inclusions in the steel carbide and loose defects such as shrinkage cavity, bubble along the processing method is lengthen, forming streamline, the streamline of after the last of the quenching distortion and cracking in the process of using, embrittlement, failure has enormous influence on the tendency.2, in the car, milling, planing and other end processing when the cutting stress, the stress can be eliminate through intermediate annealing.3, grinding stress formed during quenching steel grinding, grinding the friction heat, soften, decarburization layer, reduces the thermal fatigue strength, easy to cause cracking, early crack.Of h13 steel after fine grinding, can be heated to 510-510 ℃, to one hour per 25 mm insulation thickness for eliminating stress annealing.4, electrical discharge machining to produce stress. Enrichment of mould surface layer electrode and the dielectric element of white layer, hard and brittle, the layer itself will have crack, stress. Electrical discharge machining in high frequency should be adopted, to minimize the white layer, must be removed for polishing method, and tempering treatment, tempering in the tempering temperature.
(b) The mold parts processing in the process,Improper heat treatment, will result in the crack of the mould and scrapped prematurely,Especially the conditioning, don't for quenching, surface nitriding process again, can appear in die casting for thousands of times after surface crack and craze.Is generated when the steel quenching stress, thermal stress of cooling process with phase transformation of the organization result of stress superposition, quenching stress was the cause of shape, craze, solid temper must be carried out to eliminate stress.
(c) In the process of injection mold parts production,Die temperature, mould should be preheated to a certain temperature before production, or when the high temperature liquid metal filling chilling, which resulted in increased mold temperature gradient layers, thermal stress forming, make the mould surface cracks, even cracking.In the process of production, mold temperature rising, when mould temperature overheat, prone to stick mold, the moving parts failure caused by mold surface damage. Cooling temperature control system should be set up, and keep the mold work within a certain range of temperature.
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