The technology currently used for the fabrication of toothed wheels. gear couplings and chain drums involves the induction hardening process or hardening and tempering after carburising. All these processes take a long time and cause adverse changes in the dimensions and surface quality of products. requiring post-treatment machining to remove the resulting cavities. https://ashleyshomestores.shop/product-category/8-piece-sectional-with-chaise-and-audio-system/