Compared with middle alkali glass fiber, Alkali free glass fiber has high tensile strength, due to it's high molding temperature, hardening speed, high bond energy structure etc. And aging resistance and temperature resistance performance, to enhance the strength of the rotary wheel can reach or exceed the international standard. middle alkali fiber can not be used for grinding wheel,because of it's low strength, no aging resistance and poor temperature resistanceproperties, rotary strength decreased rapidly after grinding products arestored,bring security risks.
(1) In the high-humidity environment, the strong attenuation of the alkali-free glass fiber mesh is obviously smaller than that of the medium-alkali glass fiber mesh, and the alkali-free glass fiber is better than the medium-alkali glass fiber.
(2) From the glass fiber temperature test, it can be characterized that the alkali-free glass fiber has better temperature resistance than the medium-alkali glass fiber, which is more conducive to the enhancement of the high-speed rotating grinding wheel.
(3) From the comparison of the blasting test before and after the grinding wheel storage, it can be concluded that the initial blasting speed coefficient of the medium-alkali glass fiber mesh grinding wheel is less than 1.73, and the longer the storage time, the lower the rotation speed coefficient is less than 1.6, which is completely inconsistent. The national standard is not less than 1.73; the initial blasting speed coefficient of the alkali-free glass fiber mesh grinding wheel is greater than 1.9, and the slewing speed coefficient remains above 1.88 after six months of storage, which is in full compliance with the standard value of the quasi-swing speed. 1.73 requirements.
(4) From the cutting effect and efficiency test, it can be characterized that the cutting efficiency of the non-alkali glass fiber mesh grinding wheel is higher than that of the medium alkali glass fiber mesh grinding wheel, and the grinding loss is lower than that of the medium alkali glass fiber mesh cloth grinding wheel.
(5) E-glass fiber for reinforcing bonded abrasives fully meets national standards and meets international standards, and has high cutting efficiency, which is beneficial to increase the number of times of grinding wheels, improve efficiency and reduce costs; The reinforced abrasives do not meet the national standards and the cutting efficiency is low.
(4) The medium alkali glass fiber can not guarantee the safety performance index of the fixed abrasive wheel, and the alkali-free glass fiber is the fundamental guarantee for the safety of the fixed abrasive wheel.
