Good news came from the National Bearing Product Quality Supervision and Inspection Center on December 10, 2021. The HBZYY 75130/P4 DB bearing product developed by Hebei Shaft Research Institute has been comprehensively determined by inspection, and the inspected items meet the technical conditions and current standard requirements.
The innovation of this bearing is to replace angular contact ball bearings with
Tapered Roller Bearings. Thereby improving the rigidity and carrying capacity of the machine tool spindle.
As we all know, ball bearings of the same size are compared with roller bearings: ball bearings have a higher limit speed, but the carrying capacity is less than that of roller bearings; roller bearings have strong carrying capacity, but the limit speed is not as good as ball bearings. The use of tapered roller bearings to replace paired angular contact ball bearings to improve the stiffness and load-carrying capacity of the shaft system is the highlight and main purpose of the research and development of this new product.
In order to develop this new product, the R&D personnel designed the HBZYY 75130/P4 DB bearing product drawing after careful analysis and repeated calculations. This is a P4 grade precision tapered
Roller Bearing with back-to-back configuration. The difficulty of its research and development is that the two sets of bearings are arranged back to back, and the protrusion amount must be compressed to 1/200 of the assembly height of the normal P4 tapered
roller bearing.
After serious research and discussion by the R&D team, we carry forward the consistent spirit of excellence and meticulousness. In the end, a high-end bearing product that fully meets the design requirements was trial-produced. After this product is applied to the machine tool spindle, its rigidity and load-bearing capacity have been greatly improved.
The successful trial production of the HBZYY 75130/P4 DB bearing product provides a valuable experience for the research and development of high-precision matched tapered roller bearings and the improvement of the structural rigidity of the high-precision shafting. It fills a gap in using matched tapered roller bearings to replace matched angular contact ball bearings.
