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Causes die casting production die damage
In the process of Die-Casting Tooling Design production of aluminum casting, the causes of easy damage are:
The cutting stress produced in finishing machining such as turning, milling and planing can be eliminated by intermediate annealing. When hardening steel is ground, grinding stress is generated, friction heat is generated during grinding, softening layer and decarburization layer are produced, which reduce thermal fatigue strength and easily lead to thermal crack and early crack. After fine grinding, h13 steel can be heated to 510-570℃ and stress-relieving annealing can be carried out every 25mm insulation hour.
Edm produces stress. There is a white layer of enriched electrode elements and dielectric elements on the surface of the die, which is hard and brittle, and the layer itself will have cracks and stresses. The high frequency should be used in edm to minimize the white layer, which must be removed by polishing method and tempered at three tempering temperature. Quality problem of blank forging. Some molds produce only a few hundred aluminum castings before they crack, and the cracks develop quickly. It is possible that only the outside size is guaranteed during forging, and the loose defects such as dendritic crystals, inclusions of carbides, shrinkage holes and bubbles in steel products are extended and elongated along the processing method to form a streamline, which has a great influence on the final quenching deformation, cracking, brittle crack and failure tendency during use.
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