Product Overview & Application Fields
In industrial environments, they're often used to secure safety covers, fix metal plates in place, or hold components steady during use. Around the house, they work well for magnetic latches, organizing garage tools, or keeping heavy doors closed. In retail, they're commonly used to mount signs and displays where strength and flexibility are important. Their durable design and wide range of uses make them a practical solution for many everyday tasks.
Material Neodymium (NdFeB)
|
Product Name |
industrial ferrite ring magnets |
|
Magnetic Grade |
N42 (Br ≥ 13.5 kGs, Hcj ≥ 12 kOe) |
|
Thickness |
D20 D13mm x 5mm |
|
Countersunk Hole |
3mm |
|
Dimensional Tolerance |
Length ±0.05mm, Width ±0.05mm, Thickness ±0.05mm |
|
Magnetisation Direction |
Axially Magnetised |
|
Polarity |
Countersunk Face North |
|
Operating Temperature |
≤80°C (high-temp version available) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
3800 ±200 Gauss (measured with TM-801 Gauss meter) |
|
Magnetic Flux |
2.3 mWb (measured with fluxmeter) |
2.1 Magnetic Performance and Engineering Significance
Residual Flux Density (Br)
Residual flux density (Br) represents the magnetic flux density remaining in the magnet after saturation and removal of the external magnetic field.
From an engineering perspective, Br directly determines the maximum magnetic flux output that a magnet can provide within a given volume. A higher Br allows designers to achieve stronger magnetic fields, higher torque, or higher force density without increasing magnet size.
In applications such as electric motors, actuators, and sensors, higher Br contributes to improved power density, enhanced system efficiency, and reduced overall component size.
Intrinsic Coercivity (Hcj)
Intrinsic coercivity (Hcj) indicates the magnet's resistance to demagnetization caused by external magnetic fields, temperature rise, or adverse magnetic circuit conditions.
Hcj is a critical parameter for applications operating under high temperature, strong reverse magnetic fields, or fluctuating load conditions. Magnets with higher Hcj exhibit superior thermal stability and maintain magnetic performance even when exposed to partial demagnetizing forces.
In motor and generator applications, sufficient Hcj is essential to prevent performance degradation, torque loss, or irreversible magnetic damage during peak operating conditions or fault scenarios.
Manufacturing Process
The product is manufactured through the following key processes:
· Raw Material Preparation
High-purity rare earth elements (Nd, Pr), iron, and boron are precisely weighed and prepared according to the required magnetic grade.
· Vacuum Melting and Alloying
The raw materials are melted under vacuum or inert atmosphere to form a homogeneous NdFeB alloy.
· Crushing and Fine Powder Milling
The alloy is broken down and milled into ultra-fine powder under controlled conditions to achieve optimal particle size and orientation capability.
· Magnetic Field Alignment and Pressing
The powder is aligned in a strong magnetic field and compacted into the desired shape by die pressing or isostatic pressing.
Vacuum Sintering and Heat Treatment
The pressed compacts are sintered at high temperature under vacuum, followed by aging heat treatment to enhance magnetic properties.
Precision Machining
Sintered magnets are machined to final dimensions and tolerances using grinding or cutting processes.
Surface Coating
Protective coatings are applied to improve corrosion resistance and environmental durability.
Magnetization and Final Inspection
Finished magnets are magnetized according to specified patterns and undergo final inspection before packaging.
Why choose us?
Dongguan Jinconn New Material Holdings Co., Ltd. is a publicly listed company specializing in the integrated research and development, manufacturing, and sales of rare earth permanent magnets. Headquartered in Xiaohe Industrial Zone, Daojiao Town, Dongguan, the company serves customers throughout China and international markets worldwide.
Manufacturing Packaging Process for Neodymium Magnets
Finished magnets are inspected and then arranged in aligned stacks.
Separator sheets are inserted between magnets to prevent surface damage.
The stacks are wrapped and fixed to maintain magnetic stability.
Products are packed in cartons with customized cushioning solutions.
Final packages are labeled and moved to the finished goods warehouse
Frequently Asked Questions:
Q1. Why are NdFeB magnets prone to cracking during assembly?
A: NdFeB magnets are brittle ceramics. Press-fitting, uneven adhesive shrinkage, or impact loading can introduce tensile stress leading to
micro-cracks or delayed failure.
Q2. Are press-fit designs recommended for NdFeB magnets?
A: Generally no. If unavoidable, interference must be minimal, edges chamfered, and stress simulations conducted to avoid cracking.
Q3. How does adhesive selection impact long-term reliability?
A: Adhesives affect stress distribution, thermal resistance, and vibration damping. Incorrect adhesive choice can cause magnet detachment or cracking at elevated temperatures.
Contact Us
Phone / WhatsApp / WeChat: +86 13829120676
Email: Info@jinconn.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China
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