The role of roll grinding fluid
The role of grinding fluid
Roll grinding, due to the roller material deformation of internal friction and grinding wheel and roller material external friction, will produce a large amount of grinding heat, the highest temperature in the grinding zone sometimes up to 1000 ℃ or so. The high temperature generated by grinding can make the roll surface burns, cracks. Therefore, the cooling during grinding is very important.
The grinding fluid can play the following roles:
(1) cooling effect ---- through the thermal conductivity of the grinding fluid, can effectively improve the heat dissipation conditions, take away most of the grinding heat, reduce the temperature of the grinding area.
The size of the cooling effect and the type of grinding fluid, performance, dosage, and use methods. The greater the thermal conductivity of the grinding fluid, the cooling effect is significant. Such as water heat dissipation can be much stronger than oil.
(2) lubrication role ---- grinding fluid penetrates into the grinding chips, abrasive particles and roll contact surface, adhesion in the
After the metal surface to form a lubricating film, can reduce the friction between the abrasive particles and rollers, reduce the bonding phenomenon between the abrasive chips and abrasive particles, so as to improve the quality of the surface of the rollers and the life of the grinding wheel.
Due to the pressure on the contact surface, pure mineral oil is not easy to penetrate into the grinding zone, therefore, the general grinding fluid are added to some sulfur, chlorine, phosphorus and other extreme pressure additives. These additives can rapidly undergo chemical changes upon contact with steel and iron surfaces. Produce new compounds (iron sulfide, iron chloride, etc.), adsorbed on the metal, can significantly improve the lubricating effect.
(3) Cleaning effect ---- grinding fluid can rinse off the abrasive chips and broken and dislodged abrasive particles to prevent scratches on the grinding surface of the roll.
(4) Rust prevention role ---- After adding rust prevention additives in the grinding fluid, it can form a protective film on the metal surface, so that the rolls and grinders are free from oxidation, and play the role of rust prevention.
According to the role of the grinding fluid, the grinding fluid should meet the following requirements:, the chemical composition of the grinding fluid should be pure, should not contain toxic impurities. The pH value of the acidity of the grinding fluid should be neutral, so as not to corrode the rolls, grinders and irritate human skin;
Not easily deteriorated; not easy to burn, not volatile; good transparency, easy to observe the grinding situation;
Does not corrode the grinding wheel bond. Ceramic bond is not subject to the erosion of grinding fluid, resin bond is susceptible to the erosion of alkaline grinding fluid, rubber bond is susceptible to the erosion of oil-based grinding fluid.