A total of 20 batches of rolling bearing products manufactured by 20 companies in Shandong Province were spot-checked. According to GB/T307.3-2005 "General Technical Conditions for Rolling Bearings", GB/T304.9-2008 "General Specification for Joint Bearings" and other national standards and related product standards, the hardness, metallurgical structure of rolling bearing products, Work surface burn, internal diameter deviation and variation, external diameter deviation and variation, radial clearance, bearing actual width (high) degree deviation, components should rotate smoothly and smoothly without block, inner ring width deviation and variation, The outer ring width deviation and variation, residual magnetic strength, vibration (acceleration) and other 12 items were examined.
Spot checks found that three batches of products from three companies did not meet the requirements of the relevant standards. Unqualified projects mainly involve deviations in diameters and variations, and metallographic organization.
Shandong rolling bearing product pass rate is only 85%
In the third quarter of this year, the Shandong Provincial Bureau of Quality and Technical Supervision organized and conducted a random inspection of the quality of rolling bearing products. The results showed that the product pass rate was 85%.