Welding strength of brazing diamond grits

Monolayer diamond grinding wheels and static strength samples were prepared by the HF induction brazing technology under different conditions. The normal abrasion behavior of diamond grits was found out through the comparison between the single grit's tangential and normal component force during grinding and the static compressive strength and static shearing strength of diamond grains after being brazed. As the same time, the abrasion state of diamond grits during grinding was observed. The results show that the load applied to diamond grains during grinding process is much smaller than their static strength after being brazed. The static strength of diamond grits after being brazed is influenced by vacuum degree and heating time during brazing process. The static strength is strong under the conditions of high vacuum degree and the static compressive strength loses much under the conditions of long brazing time. Otherwise, the static shearing strength is associated to an optimal brazing time. Diamond tools fabricated by the HF induction brazing technology meet the needs of normal grinding fields. Most of the grits are micro-broken during grinding and only a few of them are pulled-out or broken-off.