**Rolling Bearing Production - Ferrule Grinding and Super (Fine) Finishing** Home > Bearing Knowledge > Production of Rolling Bearings - Ferrule Grinding, Super (Fine) Processing *728*90 created on 2018/5/16* var cpro_id = "u3440131";

Rolling Bearing Production - Ferrule Grinding and Super (Fine) Finishing

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(1) **Bearing Ring Grinding Equipment** The equipment used for grinding bearing rings is specialized, efficient, and precise, making it ideal for mass production. The types of grinders vary depending on the part being processed: - **End Grinding Machines**: Include through-type double-face grinders, reciprocating double-face grinders, vertical single-head surface grinders, and vertical double-head surface grinders. - **Outer Diameter Grinders**: Such as through-type cylindrical grinders and general centerless cylindrical grinders (reciprocating or cutting type). - **Specialized Grinders**: Such as inner diameter grinders, inner groove grinders, outer groove grinders, inner race grinders, outer race grinders, rib grinders, raceway lap composite grinders, and surface and exterior composite grinders. For ultra-precision processing, machines like outer raceway super precision machines, inner raceway super precision machines, and similar tools are used. These include mechanical, CNC, fine, and multi-station super-precision machines, some of which combine rough and finish grinding in a single station or separate stations. (2) **Common Grinding Methods for Bearing Rings** Grinding methods are categorized based on clamping and positioning techniques, such as centerless jig grinding and centering jig grinding. For outer ring diameters over 400mm, centerless grinding is commonly used. There are two main approaches for larger diameters. Grinding methods also include Fan Cheng grinding, swing head grinding, and manual grinding. Swing head grinding has largely replaced traditional methods in modern production. (3) **Finishing and Polishing of Bearing Rings** This involves using abrasive materials (paste, slurry, or abrasives) applied to a flexible polishing tool. Other methods include: - **Abrasive Belt Grinding**: Uses a rigid grinding block (such as an oil stone or shaped metal block) to press an abrasive belt against the workpiece, providing external finishing. - **Super-Finishing**: A process that precisely smoothes the workpiece. The workpiece rotates at a certain speed while a stone is pressed against its surface with controlled pressure, performing a perpendicular refining operation. Compared to polishing and abrasive belt grinding, super-finishing can reduce or eliminate roundness errors, correct shape deviations, and create residual compressive stress on the surface. This enhances fatigue resistance and improves production efficiency while reducing labor intensity. As a result, many companies have shifted from polishing to super-finishing. (4) **Tools Used in Grinding and Super-Finishing** The primary tool for grinding is the grinding wheel, which comes in various types: - Ceramic-bonded, resin-bonded, rubber-bonded, metal-bonded, and diamond-bonded grinding wheels. - Abrasives include corundum, silicon carbide, cubic boron nitride (CBN), and diamond. For super-precision work, oil stones are commonly used. Examples include silicon carbide whetstones and CBN whetstones. (5) **Development Trends in Ferrule Grinding and Machining** Ferrule grinding and super-machining have been practiced for over a century. Early methods included single-head end grinding, general channel and rib grinding, and low-speed operations—some of which are still used today. However, with continuous advancements in bearing manufacturing, the industry is moving toward higher speeds, greater precision, and automation. Future trends include high-speed grinding (with wheel speeds exceeding 50m/s), advanced CNC machining, online measurement systems, and full-process computer control. These innovations will drive the bearing industry toward more efficient and accurate production methods. --- **Surface Grinding Process**

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