|Title||Grinding wheel forming requirements|
(1) Adhesive: This adhesive is different from the adhesive for producing a nonwoven felt, the former being an emulsion type adhesive and the latter being a solvent binder. In order to make the abrasive and the fiber firmly bond, and the heat generated in the polishing process, the surface of the polishing wheel is as high as 150~180 °C, so in addition to good bonding ability, it must be It has high heat resistance. At present, modified phenolphthalein resin, epoxy resin and polyurethane resin are generally used in foreign countries.
(2) Sticking sand: Generally completed on a special finishing equipment. In order to ensure the uniformity of the abrasive on the product, the abrasive application method is particularly important. At present, the dusting method is generally adopted. standard cut off wheel for metalThe structure is a hopper with abrasive material on the top. The hopper is equipped with a discharge roller with elastic card cloth. The discharge roller rotates, and the abrasive falls evenly into the clothing, on the side of the discharge roller. A vibrator with a wire brush is attached, and the abrasive falling into the card clothing is peeled off by vibration and falls onto the non-woven mat. Another method is sprayed onto the non-woven felt by a spray gun, but the uniformity of the abrasive is difficult to ensure, and the abrasive wears on the nozzle. After the abrasive is dusted or sandblasted, the adhesive is sprayed to make the abrasive and the fiber firmly adhered. The knot finally forms a grinding wheel of practical value.
Finally, the grinding wheel is reworked into various types of polishing wheels, which can be divided into four types: shot type, laminated type, pleated type and attached type. Shot type: Cut the sand felt into long squares of the required size. Arranged radially around the wheel core. The inner ring is bonded with an thin flat cutting discand its density is increased from the outside to the inside.
Laminated type: The sand felt is cut into layers of the required size, and the product is laminated and compacted, and the density is uniform inside and outside. Pleated type: The sand felt is cut into long squares of the required size, folded into a circular ring and fixed with a hexagonal steel buckle.
Axis type: Cut the sand felt into long squares of the required size and arrange them radially around the wheel core and insert them into the center shaft. The sand felt has better precision on the working surface than the first and second grades of the fabric, the surface is flat, the wear is small, and the falling sand is small, which is suitable for the mass production of mechanization; the disadvantage is that the abrasive and the fiber are only bonded by the adhesive, bonding The point is small and there is some abrasive falling off.
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