The failure analysis of cemented carbide roll ring is as follows
The research shows that the abnormal damage of cemented carbide roller ring includes: fragmentation, block dropping, radial cracking, ring cracking, etc. Due to the cold and hot effect in the rolling process and the low abrasive wear of the billet on the rolling groove, the network cracks are formed on the surface of the rolling groove. If the cooling water pressure is not enough, serious vaporization tension will be generated inside the crack, which will promote the further expansion of the crack. If the grinding is not done in time, it will cause fragmentation or block falling. The instantaneous water cut-off in the rolling process will cause the surface of the rolling groove to burst or even crack as a whole. Ring cracks are mostly caused by excessive rolling force or low strength and toughness of cemented carbide.
There are many reasons for the excessive rolling force, such as unreasonable pass selection, bad billet cutting, low billet temperature, and poor pass alignment. If the brand is not selected properly, the strength and toughness of cemented carbide roll ring will be low. The porosity and cobalt pool of cemented carbide roller ring are also the factors causing ring cracking. The radial crack is related to the excessive installation pressure and the matching degree of the taper sleeve.