Long dai kasting prodaksen, nambawan komon fom bilong bagarap bilong ol mol em long krek na krek. Stres em i nambawan as bilong bagarap bilong ol mol. Ol samting i save kamapim hevi, mekanik, kemikel, na operesenel sek em ol as bilong stres, olsem ol mekanik na hat stres, we ol i save kamapim long:
Long wok bilong wokim ol mol
1) Ol hevi bilong mekim nogut long pasin nogut
Some molds produce cracks only when they are produced in a few hundred pieces, and cracks develop rapidly. It is possible that only the outer dimensions are ensured during forging, and the loose defects such as dendrites, inclusions, shrinkage cavities, and bubbles in the steel are stretched and elongated along the processing method to form a streamline, and this streamline is for the future. The final quenching deformation, kreking, bruk bruk long taim bilong yusim, na feil tendensi i gat bikpela impak.
2) Katim stres i kamap long taim bilong laspela masin olsem tanim, milim, plening, na ol narapela{1}}, we ol i ken rausim long intamediet annealing.
3) Grinding stress occurs during hardening of steel, friction heat is generated during grinding, softening layer and decarburization layer are generated, thermal fatigue strength is reduced, and thermal cracking and early cracking are easily caused. After the fine grinding of h13 steel, it can be heated to 510-570℃C, and the thickness is maintained every 25 mm for one hour for stress relief annealing{5}}
4) EDM produces stress. The surface of the mold produces a white bright layer rich in electrode elements and dielectric elements, which is hard and brittle. This layer itself has cracks and stress. EDM should use a high frequency to minimize the white layer. It must be removed by polishing and tempered. The tempering is carried out at the tertiary tempering temperaja.
2. Long taim bilong prosesim mol
I no stret tritmen bilong hat bai mekim na mold i bruk na ol i mas rausim pastaim. Tasol sapos yu dai na mekim yu i kamap isi, bai yu no inap long kilim yu i dai, na yu bai i no inap kaikai gut, na taim yu dai long pes bilong yu, yu ken bruk na bruk.
Stres we i kamap taim ol i pinisim 'stiel' em i as bilong 'superposition' bilong 'thermal stress' long taim bilong mekim wok i kol na 'structure stress' long taim bilong senis bilong 'phes'. Dispela i mekim na hevi bilong 'deformation' na 'cracking', na strongpela samting i mas hat long rausim hevi bilong dispela hevi.
