Therefore, diamond retention is strengthened, the pull-outs of the diamond grains are effectively prevented, and the service life and efficiency of diamond tools are improved.

The measures and the development improving the bonding strength between the matrix and diamond of metal bond diamond abrasive tool were reviewed with emphases.

In this paper, three measures used to improved the bonding strength between the matrix and diamond are introduced.

The desquamating grade of diamond and the holding force coefficient between matrix and diamond were suggested as new concepts.

Aiming to the problems which are existed in the electrode holder at submerged arc furnace in China, such as, the asymmetrical pressure, the unsuitable control of the holder' s reduction and also the bad effect of the cooling water, we put forward the new ideas for designing new pressure ring holder.

Research construction design and parameters choice of the electrode holder,basing on the the key calculation on big and small water-cooling cashing pipe and pressure ring.

Submerged-arc furnace is a kind of primary equipment for ferroalloy smelting, and the electrode holder system is used for transferring powerful electric current to the electrode, clamping the contact shoe to the electrode, controlling the sintering of electrode.