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Cause Analysis And Prevention Measures Of Die-casting Mould Damage
Aug 14, 2017

  Cause analysis and prevention measures of die-casting mould damage

  die-casting mould production die damage reasons: In the die-casting mould production, the most common form of mold damage is crack, cracking. Stress is the main cause of mold damage. Thermal, mechanical, chemical, and operational shocks are sources of stress, including mechanical stress and thermal stress, which are produced by:

  First, in the mold manufacturing process

  1. Blank forging quality problem. die-casting mould Some molds only produce hundreds of pieces of crack, and crack development is very fast. It is possible that the forging only guarantees the outer dimension, and the steel dendritic crystals, inclusions carbide, shrinkage, bubble and other loose defects along the processing method is extended to form a streamline, the flow of the final quenching deformation, cracking, the use of the process of brittle cracking, failure tendency greatly affected.

  2, in the car, milling, planing and other final processing of the cutting stress, this stress can be eliminated through the intermediate annealing.

  3, quenching steel grinding stress, grinding friction heat, resulting in softening layer, decarbonization layer, die-casting mould reduce the thermal fatigue strength, easy to lead to thermal cracking, early crack. After grinding, the H13 steel can be heated to 510-570 ℃ to remove stress annealing at a thickness of one hours per 25mm insulation.

  4, EDM production stress. The surface of the mold produces a layer of white layer which is rich in electrode elements and dielectric elements, and is hard and brittle, and the layer itself will have cracks and stresses. die-casting mould EDM should be used high frequency, so that the white layer minimized, the polishing method must be removed, and tempering treatment, tempering at three tempering temperature.

  Second, the mold treatment process of improper heat treatment, will lead to die cracking and premature scrap, in particular, only the use of quality control, not quenching, and then surface nitriding process, in the die-casting mould thousands of die after the surface cracking and cracking. The stress in steel quenching is the result of the superposition of the stress in the process of thermal stress and phase change, and the quenching stress is the cause of deformation and cracking, and the solid must be tempered to eliminate the stress.

  Third, in the production process of die-casting mould

  Mold temperature die Before the production should be preheated to a certain temperature, otherwise when the high-temperature metal liquid filled with a cold, resulting in the mold inside and outside the temperature gradient increased, die-casting mould forming thermal stress, the mold surface cracking, and even cracking. In the production process, the mold temperature is rising, when the mold temperature overheating, easy to produce sticky mold, moving parts failure and lead to mold surface damage. The cooling temperature control system should be set up to keep the mold working temperature within a certain range.