Q: What are the advantages of ECM machining of bearing raceways?
A: ECM machining of bearing raceways leverages the unique advantages of interdisciplinary processing, fully utilizing the advantages of electrochemical machining such as good surface quality, low surface roughness, high processing efficiency, and high machining precision. It is a composite machining process that combines the anodic dissolution of electrochemical processes with the mechanical scraping action of abrasives. The characteristics of ECM process include:
● Ideal surface micro-geometry, low coefficient of friction, low wear, good precision retention, and good surface contact stiffness;
● The machined surface layer has good physical and mechanical properties, no metallographic changes, no work hardening, high processing productivity, wide processing range, low processing cost, simple process equipment, and convenient operation and maintenance.
Studies have shown that ECM machining of bearing raceways can improve the surface quality of bearing raceways, improve bearing performance, and overcome the defects of oilstone ultra-precision machining.
Bearing rings machined using ECM have an ideal micro-geometry for precise fit.
ECM machining eliminates the need for hard metal removal through cutting. Instead, it etches a thin layer of metal into a passivating film with lower hardness, which is then removed. This removal begins at a microscopic high point, quickly forming its unique "plateau-like" surface, thus improving the working characteristics of the mating surfaces. This surface is wear-resistant, has good contact stiffness, and maintains high precision. Machining productivity is not limited by the strength or hardness of the metal.
The main failure modes of rolling bearings are fatigue and wear, which always occur in the surface layer. Therefore, the quality of the bearing surface layer is crucial to its service life. The principles and characteristics of ECM machining dictate that it must avoid heat-affected layers, cold/hot plastic deformation layers, work-hardened layers, and burn cracks, and it can remove all of these surface defects. The micro-geometry of the ECM-machined surface is beneficial for surface friction reduction, resulting in a larger actual contact area during mating and reduced contact pressure. Therefore, this surface is beneficial for increasing the bearing's rated load and extending its service life. Roughness and waviness are the main causes of vibration and noise in raceway bearings. Larger raceway roughness and waviness lead to increased bearing vibration acceleration, velocity, and noise, resulting in a corresponding decrease in bearing service life. Electrochemical machining has a strong ability to remove waviness. Based on its processing principles and characteristics, the passivation film at the troughs and the mechanical action of the honing stone only affect the high points, quickly removing the peaks and reducing roughness and waviness, thereby directly improving bearing vibration and effectively reducing noise.
About LJHB:
LuoYang JinShuo Precision Bearing Co., Ltd. is mainly committed to the R&D and sales of high-precision bearings and other special products, and provides bearings and transmission parts with high performance for customers' equipment. With quick response, from pre-sales technical communication to on-time production delivery, as well as perfect after-sales service, we win the recognition and trust of customers.
Our main products include cylindrical roller bearings, tapered roller bearings, slew bearings, gear drives, spindle bearings, crossed roller bearings, turret bearings, thin-wall bearings, tandem roller bearings, spherical roller bearings, etc. The bearing dimensions rang from 100mm to 6000mm, the accuracy reaches P5, P4 and P2 levels. The bearing are widely used in mining and metallurgy, industrial equipment, industrial gearboxes, petroleum equipment, cranes, medical equipment, robotic equipment, etc. Among them, cylindrical roller bearings with better performance and high-precision deep groove ball bearings have been explored for high-speed tubular strander rotating cable equipment, which have completely replaced imports, saving customers costs and time, and improving work efficiency. It has been recognized and widely praised by customers.
Contact LJHB:
Address: Yiyang Bearing Industry Zone, Luoyang City, China 47100
Tel/Wechat: +86-18037970383
Whatsapp: +86-18037970383
Fax: 0086-379-65199160
E-mail: lyjh@lyjhbearing.com
Website: www.chinajhbearing.com
