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        Company News
        Die casting mould damage causes and preventive measures Date:2013/10/15 8:54:08 From: 【Close】

        One, cause of die casting mould damage: in die casting production, mold damage is the most common form of crack, crack. Stress is the main cause of mould damage. Thermal, mechanical, chemical, switching impulse is produced should be power, including the mechanical stress and thermal stress, stress arising from: (a) in the mold manufacturing process in 1, forging quality problems. Some die only produced hundreds of pieces of cracks, and the crack development quickly. There may be forged only guarantees the size, and dendritic crystal inclusions in steel, carbide, shrinkage, bubbles and other loose defects along the processing methods have been extended to elongate, the streamline formed, this line after the final quenching deformation, cracking, used in the process of brittle fracture, failure tendency of great influence. Cutting 2, produced in the car, milling, planing and finishing of the stress, the stress can be eliminated by annealing. 3, hardened steel grinding grinding grinding stress, frictional heat generated, the softened layer, decarburized layer, reduce the heat fatigue strength, easily lead to hot cracking, the early crack. For H13 steel in the fine grinding, can be heated to 510-570 DEG C, the thickness of each 25mm insulation one hour for stress relief annealing. 4, electrical discharge machining stress. Die surface layer electrode and dielectric elements enrichment elements of the white layer, hard and brittle, this layer will crack, stress. The electrical discharge machining process should be used with high frequency, the white bright layer is reduced to a minimum, must carry on the polishing method of removing, and tempering, tempering at three level of tempering temperature. (two) the mold process will lead to improper heat treatment, die cracking and premature retirement, especially using only quenched and tempered, not by quenching, after surface nitriding process, die-casting die in thousands of times will appear after the surface cracking and cracking. Steel quenching stress, stress and phase transformation is tissue stress results from the superposition of the cooling process of hot, quenching stress is caused by deformation, cracking, solid must be tempered to eliminate stress. (three) in die casting process 1, mold temperature mold should be heated to a certain temperature in pre production, or when the high temperature liquid metal filling type have a chilling, cause mould inner and outer layer of temperature gradient, heat of formation stress, so that the surface of die cracking, or even cracking. In the production process, mold temperature rising, when the die temperature, easy to produce mold sticking, moving parts failure led to the mold surface damage. The cooling temperature control system should be set up, keep the mould temperature within a certain range.

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