The bearing retainer has the functions of guiding the movement of rolling elements, improving the lubrication conditions inside the bearing, and preventing the rolling elements from falling off. We have introduced a lot of knowledge about bearing retainers in previous articles. I believe that everyone also knows the two terms of solid retainers and stamped retainers. What is the difference between them?   

Ⅰ. The difference between solid retainers and stamped retainers
1. Different manufacturing processes
Solid retainers: Solid retainers are also called machined retainers. They are made by melting and processing some retainer materials specified in the bearing code, usually including metal melting, pocket hole processing, perforation processing, and grinding processes.
Stamped retainers: Stamped retainers are a manufacturing process that uses various presses with various shapes of molds to press metal materials or non-metallic materials in a cold state to produce plastic deformation or separation, thereby forming a specific size and shape. Stamping can be divided into several processes: blanking, bending, calendering, forming, three-dimensional pressing or extrusion.

Ⅱ. Different materials used
Solid cages: steel, copper, polyamide (nylon 66). At present, solid cages are mainly made of non-metallic materials, among which polyamide has better sliding and self-lubricating properties, but its high temperature resistance is not as good as that of steel and copper solid cages.

Stamped cages: Stamped cages are often made of steel plates, and sometimes copper plates. Stamped cages are lighter than metal solid cages.
The above is the difference between solid cages and stamped cages. Let's take a closer look at the classification and characteristics of bearing cages.
1. Steel cages are divided into stamped and solid. This type of cage has high strength and light material. It is mostly used for deep groove ball bearings, strip roller bearings and most tapered roller bearings. It is generally not affected by the mineral oil machine or alkali oil machine lubricant of rolling bearings. The cage operating temperature can reach 300 degrees Celsius, but it is easily affected by water and water vapor and rusts.
2. Brass bearing cages have high tensile strength and mechanical strength comparable to steel plate stamping cages, but the density is relatively small and the limit speed is high. It is not affected by lubricants, including synthetic oils and greases. Brass cages cannot be used in places above 300 degrees Celsius, and are not suitable for ammonia, such as cooling, because ammonia will cause seasonal breakage of brass. The operating temperature must be below 300 degrees Celsius.
3. Nylon bearing cages. Nylon materials are highly elastic and lightweight, with very good sliding and self-lubricating properties. They are particularly suitable for situations with vibration impact hard force or high acceleration and deceleration or when the inner and outer rings of the bearing are tilted against each other. The operating temperature is -40-120 degrees.

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