Thermal Deformation Avoidance Method for Molds in Continuous Mass Casting Production

Continuous mass casting production makes molds bear long-term cyclic high-temperature thermal load, and unbalanced temperature field and residual stress accumulation are the core causes of mold thermal deformation, which leads to casting dimensional deviation and mold scrap in severe cases. Systematic thermal deformation avoidance technology can effectively stabilize mold precision in long-term continuous production. First of all, implement uniform integral preheating to ensure the mold surface temperature difference is controlled within 5℃ before production, eliminating initial unbalanced thermal expansion stress and reducing basic thermal deformation by 47%. Adopt three-stage graded cooling strategy instead of one-time rapid cooling: initial slow cooling, intermediate constant temperature cooling and final rapid cooling, which avoids structural shrinkage deformation caused by excessive temperature drop rate, reducing deformation risk by 62%. Maintain cooling water flow stably at 8-10L/min in continuous production to keep the mold dynamic temperature difference within 8℃, avoiding periodic thermal fluctuation deformation. Regularly conduct low-temperature stress relief annealing treatment at 200℃ every 5000 production batches to release cumulative thermal fatigue residual stress, reducing residual deformation accumulation by 58%. Optimize the mold cavity to adopt a fully symmetrical structural design to ensure uniform thermal stress distribution on all parts of the mold, reducing unilateral offset thermal deformation by 71%. The comprehensive application of the above measures can control the mold continuous production thermal deformation failure rate below 1.7%, realizing long-term stable precision production.