Plastic mold steel life

⒈ inclusions increased content

Inclusions in steel are the source of cracks in the mold. In particular, inclusions such as brittle oxides and silicates do not undergo plastic deformation during thermal processing, causing fragile fractures to form microcracks that further cause cracking of the mold during further heat treatment and use. E.g. Cr4W2MoV steel stamping watch parts used in the cold die, the punch after roughing, heat treatment and grinding process, found that there are many small holes in the center of the head, resulting in a group of all the scrapped scrap, issued by the analysis contains a large number of steel The chain-like silicate inclusions, after machining spalling caused by small holes.

⒉ uneven distribution of carbides caused by failure

Cr12, Cr12MoV, Cr12Mo1V1 austenitic die steel, with a large number of eutectic carbides, when the forging ratio is small or pouring temperature control is not appropriate, easy to strip in the steel or mesh carbide segregation, the mold parts in the quenching Occurred often along the strip or mesh carbide serious crack site, or in the course of the internal cracks to further expand and cause failure. For example, the use of Φ50mm eutectic carbide unevenness of more than 4 grade steel manufacturing punch prone to fracture during use.

⒊ forging quality caused by failure

The quality of steel forging quality, a direct impact on the life of the mold. Forging the heating system and the deformation process is improper, can cause overheating of steel, surface cracks, internal crack, angle crack and other defects. These will reduce the life of the mold, or even directly scrapped. For high-carbon high-chromium ledeburite, due to poor thermal conductivity, if forging heating heating speed too fast, insufficient insulation time, resulting in forging billet temperature difference between inside and outside, resulting in internal cracks.

⒋ poor surface quality

If the surface of the alloy die steel decarburization serious, after machining, there are still residual decarburization layer, so that the final heat treatment in the mold, due to different internal and external tissue caused significant stress, resulting in quenching cracks mold; the other hand , After quenching the hardness of the mold surface layer is low, and cross-section hardness distribution is uneven, reducing the service life of the mold.

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