Ball Slewing Rings Made In China
The technical indicators that the factory must insist and make concessions in the process of processing ball slewing rings.
In the machining process, there are more or less unreasonable design technical indicators, machining errors, worker skill level and machine tool accuracy, as well as additional factors such as the material of the product itself, heat treatment and stress release, so there is a dilemma or multiple unattainable factors. Technical indicators, how to choose, this article analyzes the experience from actual factory processing, detection and equipment application.
First of all, on the premise of ensuring the installation size, some sizes and indicators of the slewing bearing are optional.
1. The mounting holes themselves are prepared for mounting screws, and the mounting holes can only be large, not small. A little bigger or even 2mm, it doesn’t matter! As long as the center diameter is within 1mm!
2.0 clearance or negative clearance, as long as the clearance is within 0.01 or halfway, it does not matter, after the installation, the clearance will only become smaller and smaller.
3. Ordinary clearance value, it does not matter if it is larger! Because the clearance value itself is an artificial regulation, a clearance of 0.15, even 0.3, does not hinder the rotation performance at all, and there is no necessary connection with the overall quality.
4. Runout, end runout and radial runout are all about the level of the grinder. Exceeding the limit does not mean that it is unqualified. You must know that the base surface of the installation platform is the final installation accuracy! It is completely nonsense because the runout of several tracks affects the accuracy of the entire equipment of the bearing. The grinding of the bearing base is basically a rough turning level!
The stability, reliability and long life of ball slewing ring and slewing ring bearing are the ultimate design goals. This paper summarizes a very reliable data from the bearing structure, design, actual use feedback and information collected by customers on site. Gives a reference for end user equipment selection.
From the perspective of many slewing bearing application equipment, four-point contact ball slewing rings are basically used in hoisting machinery, mining machinery, construction machinery, port machinery, marine machinery and high-precision rotary drives.
The four-point contact ball is flexible in structure, rotates smoothly, resists permanent fatigue, has a long service life and is not easy to be damaged. It is the soul and leading variety in slewing bearings. With lubrication and seal protection in place, four-point contact ball slewing bearings are the absolute first choice.
From the feedback data, there is no doubt that the feedback conditions of ball bearings are the best, the service life is the highest, and the stability, reliability and service life are the longest.
Secondly, crossed ball bearings, represented by 1797/3230G2K, 1797/2635 and 1797/2600, 197/2500 derived models, stand out in the field of thermal power plant bucket wheel bearings.
It can be said that in the selection of thermal power plant bucket wheel bearings , The 1797 series of crossed roller bearings is the absolute first choice, the life is basically more than 8-10 years, in the case of lubrication and protection closely followed, there are few cases where the life is reduced, its design is stable and thick, and its dead weight reaches 7600kgs , mature and reliable, and the manufacturing process is also improving day by day, which is second to none in the thermal power plant bucket turbine bearing.
Finally, three-row roller bearings, with 132.50.3150, 3550, 4000, 4500, 5000 series, lead the way in cranes, cranes, stationary cranes, dock cranes, port cranes, anti-overturning moment, anti-permanent Deformation, overload capacity is super. However, the three-row structure of the slewing bearing is relatively complicated.
Therefore, the use of the cage is an absolute means to improve the life and reliability of the three-row roller bearing. The auxiliary thrust balls and radial rollers all adopt the segmented cage and the overall cage design, which can improve the reliability of the bearing and greatly improve the life of the three-row roller bearing.
The traditional spacer block has great disadvantages, which is not conducive to the movement and friction of the rolling elements of the ball slewing rings.
