What superhard abrasive materials manufacturing formula is

Abrasive formula design based on the use of performance and processing requirements , is to create high-quality abrasives afternoon to link.
A recipe formulation design principles must follow the following principles . 1 . Formulation to meet the requirements for use . 2 . Formulation to ensure that the possibility of the manufacturing process. 3 . Rich source of raw materials used , low prices. 4 . Manufacture and use of the process, people and the environment as much as possible does not produce mini flap disc  harmful effects. Second, the formulation process of molding resin bonded abrasives molding , thermoforming generally used method , ie the process by pressing the upper and lower pressure thermal conductivity of the mold extreme heat, melt the bonding agent , and to maintain a certain pressure, in a certain time, so that condensation cured , it is not easy to foam or abrasive layer from cracking and to maintain the density , hardness and bond strength matrix abrasive . Small diameter products can be used for cold molding methods . Curing ( hardening ) of the thermoplastic phenolic resin and hexamethylenetetramine , in the preliminary compression molding has become a thermosetting phenolic resin, the article has a certain strength and hardness, but since the pressing time is short, curing is not sufficient , yet the quality of the product meet the requirements of the use of grinding , and therefore must be the second curing temperature and time control , the plastic resin , the free phenol and hexamethylenetetramine curing reaction proceeds sufficiently , does not melt completely into insoluble thermosetting resins. Curing equipment cured resin  abrasive flap disc bonded abrasive equipment is relatively simple , the most used electric oven drying , the drying device is a drying chamber using double metal sheet made ​​of laminated with asbestos , aluminum silicate, and glass fiber insulating insulation material fill. When powered on, the heat resistance wire heating oven bottom , so that the inside of the wheel heat curing . However, this part of the bottom of the drying chamber is heated , the heat flow increase , relatively high temperature for curing the resin bond products commonly used drying box oven with a blower device , which can heat the air in the officer by mechanical action , convection to keep the temperature as even as possible . Using electrical contact thermometer temperature measurement point in the box upper part , so as to be loaded inside the article installed in the position of the intermediate layer . SBC device temperature can also be used to control the temperature , the recorder can be observed through the whole process of heating curve to determine the amount due to the number of installed furnace caused narrow belt  by changes in temperature speeds. Determining the curing temperature curing temperature is the maximum temperature is determined according to different kinds of resins . Phenolic resins such as the maximum temperature to 180 - 190 ℃ appropriate, below this range, the curing is complete , the bond stability  is poor , above this range , adverse effects on the mechanical properties of the article , the article makes the hardness, strength reduced consumption, or even lose value as scrap . Therefore, the phenol resin curing temperature was 185 ℃ ± 5 ℃. The polyimide resin is 230 ℃. Determining a heating rate of temperature rise rate is determined according to the characteristics and shape of the abrasive determined . Resin binder in the press has a short curing , has 85% - 95% of the thermoplastic resin becomes a thermosetting resin , mine heating rate at 100 ℃ before you can quickly ,100 - 140 ℃ may be slower ,150 - 185 ℃ accelerate and proper , but in the insulation, the discharge time may be longer, a polyimide resin , a high temperature pre-polymerization , the temperature at 180 ℃ freely before the temperature slowly after 200 ℃ , holding time is appropriate to put long.