Ningbo Jinji Strong Magnetic Material Co., Ltd. is a respected leader in the magnetic materials industry, recognized for its precision-engineered permanent magnets. Among its specialties, the company has perfected both the ring magnet manufacturing process and the more advanced radial ring magnet manufacturing process—two core capabilities that support the performance needs of modern industries such as automotive, electronics, medical technology, and energy systems.
What Are Ring Magnets and Radial Ring Magnets?
Ring magnets are a type of permanent magnet with a round shape and a central hole, commonly used in electric motors, magnetic couplings, and sensing equipment. These can be magnetized axially (through the thickness) or diametrically (across the diameter).
Radial ring magnets, on the other hand, feature magnetic alignment around the radius of the ring. This unique magnetization pattern significantly improves torque and efficiency in high-performance motor applications.
Ring Magnet Manufacturing Process
At Ningbo Jinji, the ring magnet manufacturing process follows a rigorous, high-precision workflow designed to ensure optimal magnetic strength, dimensional accuracy, and long-term durability.
-
Material Preparation
High-purity neodymium (Nd), iron (Fe), and boron (B) are mixed and melted to form alloy strips, which are the base material for neodymium ring magnets. -
Fine Milling
These strips are crushed and milled into a fine powder. The grain size is tightly controlled to enhance magnetic alignment and consistency. -
Magnetic Pressing
The powder is pressed into ring shapes under a powerful magnetic field—either axial or diametrical—depending on the design requirements. This stage sets the magnetic orientation of the final product. -
Sintering
Pressed components are sintered at high temperatures to bond the particles into a solid, dense magnet, enhancing mechanical strength and magnetic performance. -
Machining & Grinding
The sintered rings are machined using high-precision tools to achieve the desired outer and inner diameters, as well as thickness, with micrometer-level accuracy. -
Surface Coating
Anti-corrosion coatings (Ni-Cu-Ni, epoxy, etc.) are applied to protect the magnet in demanding environments. -
Magnetization and Quality Inspection
The rings are magnetized using specialized equipment, then undergo a series of strict quality control checks to ensure they meet magnetic and dimensional specifications.
Radial Ring Magnet Manufacturing Process
The radial ring magnet manufacturing process is more complex and technologically advanced, requiring specialized equipment and deep material science expertise. Ningbo Jinji employs proprietary techniques to create magnets with radially oriented magnetic fields—ideal for high-performance motors and generators.
-
Radial Orientation Setup
Unlike standard rings, radial magnets require a custom magnetic field during pressing. Special molds with built-in radial magnetic fields are used to align particles accordingly. -
Hot Pressing or Hot Extrusion
The powder is then pressed under high temperature and pressure to solidify the radial magnetic structure. Hot extrusion is also used in some cases to shape and enhance the anisotropy of the magnetic grains. -
Precision Machining
The formed radial rings are carefully machined to meet tight tolerance requirements, ensuring compatibility with motor housings and rotating assemblies. -
Coating and Radial Magnetization
A durable coating is applied for environmental resistance. Magnetization is performed radially using advanced systems to ensure a smooth and even magnetic field around the ring's circumference. -
Advanced Testing
Magnetic field analysis, dimensional measurement, and durability testing are conducted on every batch to ensure flawless performance under operational loads.
Why Choose Ningbo Jinji Strong Magnetic Material Co., Ltd.?
-
Advanced Capabilities: Full in-house control over both the ring magnet manufacturing process and the radial ring magnet manufacturing process.
-
Custom Solutions: Ability to produce complex shapes, segmented rings, and custom magnetization patterns.
-
Strict Quality Control: ISO-certified systems, advanced testing labs, and a zero-defect philosophy.
-
Global Reach: Trusted by clients in Europe, North America, and Asia for consistent quality and engineering support.
By mastering the ring magnet manufacturing process and radial ring magnet manufacturing process, Ningbo Jinji continues to empower industries with high-performance magnetic components that meet the evolving demands of precision engineering and energy-efficient systems.
www.jjmagnet.net
Ningbo Jinji Strong Magnetic Material Co., Ltd.