The coating of NdFeB magnets is to add a protective layer on the surface, which plays the role of anti-corrosion, anti-rust, and prolonging the service life. There are three most common coatings for NdFeB magnets, namely zinc plating, nickel plating, and epoxy coating.

1 In terms of price, galvanized coating is extremely advantageous, and the prices are ranked from low to high as zinc, nickel, and epoxy coatings.

2 After the nickel-plated surface treatment, the corrosion resistance of the magnet is higher, up to 96H salt spray without rusting, while the galvanized coating can only achieve 48H salt spray without rusting. Now the commonly used nickel-copper- Nickel plating method can achieve 120-200 hours of salt spray without rusting.

3 Compared with nickel plating, zinc plating has different surface coatings and different corrosion resistance, and its service life is lower than that of nickel plating. After a long time, the surface plating will easily fall off, causing the magnet to oxidize, thereby affecting the magnetic force.

4 Nickel plating is better than galvanizing in polishing, and the color is brighter. For those with high requirements on product appearance, nickel plating is generally selected. For some non-exposed magnets, galvanizing treatment is enough.

5 Epoxy resin coating: As the name implies, it is to add a layer of resin paint to the outside after nickel plating. In recent years, it has developed rapidly, and many buyers choose it. The advantage is that it can achieve the color you want.

No matter what kind of coating it is, it has its advantages, and the one that best meets your needs is the best.

Magnetic materials are now mainly divided into two categories, one is soft magnetic materials, the other is hard magnetic materials (permanent magnetic materials).

Soft magnetic material: high permeability, easy to be magnetized and easy to demagnetize. In the saturation state, the magnetic flux is large, the coercivity (Hc) is small, the total area of the hysteresis loop is narrow and long, and the loss is small (the total area of HdB is small). Contains magnetic pure iron, silicon steel sheet, (Fe, Ni) ferrite core, etc.

They are suitable for automotive relays, motors, transformer skeletons and magnetic rings of various high-frequency magnetic induction components.

Soft magnetic materials are easy to be magnetized and easy to demagnetize, and their main functions are magnetic conductivity, conversion and transmission of electromagnetic energy, and are widely used in various electrical energy conversion equipment. 

Soft ferrite is the most used in inductance components. Soft ferrite is a kind of composite oxide. It is a composite body sintered by some metal oxides through a ceramic process. It is higher than metal materials, so the eddy current loss is extremely small, and it can work under high frequency conditions. However, because the electromagnetic characteristics are affected by temperature, it is not suitable for high-power electromagnetic devices, and it is only suitable for working under medium-high-frequency and low-power conditions.

Hard magnetic material: large magnetic energy product (Hc) (>102A/m), large magnetic loss Br, large total area of hysteresis loop, and large loss. Such as tungsten steel material, carbon steel, AlNiCo alloy, etc. After being magnetized, it can maintain strong magnetism for a long time, and is suitable for making permanent magnets in magnetoelectric watt-hour meters, electromagnets in mobile phone earphones, and rare earth permanent magnet speakers.

At present, our factory produces hard magnetic materials, that is, permanent magnet materials, including AlNiCo, SmCo, ferrite and NdFeB. Among them, the most expensive is SmCo magnet, and the cheapest is ferrite.The one with the highest performance is the NdFeB magnet, but the one with the most stable performance and the best temperature coefficient is the AlNiCo magnet.You can choose different hard magnetic products according to different needs.

People familiar with magnet materials must have heard of Al-Ni-Co magnets. Alnico permanent magnet material is an alloy composed of metal aluminum, nickel, cobalt, iron and other trace metal elements. Al-Ni-Copermanent magnet material is the earliest widely used permanent magnet material, and its preparation process and technology are quite mature. Before the discovery of rare earth permanent magnet materials in the 1970s, Al-Ni-Co alloy was the strongest permanent magnet material, and was gradually replaced by ferrite permanent  magnets and rare earth permanent magnets.

AlNiCo is mainly produced by casting method, and powder metallurgy can also be used to make sintered magnets corresponding to cast magnets, but the performance is slightly lower. The casting process can be processed into magnets of different sizes and shapes. Compared with the casting process, the sintered products are limited to small sizes, and the dimensional tolerances of the produced blank products are small, and the casting processability is good. Among the permanent magnet materials, Cast AlNiCo permanent magnets have the lowest reversible temperature coefficient, and the working temperature can be as high as 500 degrees Celsius.

AlNiCo magnets have good temperature stability and aging stability, and are suitable for making instruments, motors, electroacoustic devices, and magnetic machinery. AlNiCo magnets are also often seen in other high temperature resistant fields

Magnet is used in many places in the home, it is actually in every corner of our life, but we do not find it.

Why is it so widely used? Because a lot of electrical appliances if there is no magnet, there is no way to work, I will introduce some common products to you from several aspects, you can have a look!

1. Microwave magnet: Almost every family has a microwave oven, which brings a lot of convenience to our daily life, but have you ever thought that the magnet plays a very important role in the microwave oven?

Normally, microwave ovens have two magnets in the magnetron that guide electrons to heat food.

2.Magnetic Knife Holder: Proper placement of sharp kitchen utensils, such as knives and forks, is a constant headache for many people. We all know that keeping a sharp knife in a drawer is very dangerous. Magnet manufacturers tell you that with the help of magnets, sharp knives and forks can be safely fixed to the wall of the knife holder.

3.Speaker magnets: Speakers are one of the most important pieces of equipment in our home audio system. You can find magnets in all speakers. Magnets can interact with coils in the speaker to produce sound. To produce a powerful sound, some small, powerful speakers use neodymium magnets.

4.Treadmill Magnets: Treadmills are a great choice for home exercise equipment. When we run on a treadmill, a magnet passes through a sensor to count revolutions as the machine moves.And convert it into distance information.

5.Laptop Magnets: Many of the gadgets in our regular laptops use magnets. Magnets, for example, are used in laptop speakers and small fan motors. In addition, you can find a magnet on the laptop's hard drive (usually on the lid) so that the computer can know whether the lid is open or closed.

6.Telephone magnets: We often use magnets on our mobile phones, while microphones and speakers use small magnets to capture and produce sound.

7.Handbag Magnets: Many girls like handbags not only because they are useful, but also because they are a fashion statement. Handbags are known for their use of magnets. These magnets can be assembled easily because of magnetism.

The magnet of vacuum cleaner: The magnet is also one of the important parts of vacuum cleaner. A vacuum cleaner works by using an electric motor to drive the blades to spin at high speed and generate negative pressure air in a sealed housing to collect dust. Vacuum cleaners' motors use powerful neodymium magnets to generate high suction.

What factors affect the price of magnets?Why are the quotations of magnets of the same material different?Many novice buyers will have many such questions, and now I will answer them in detail.

The quotation of magnets mainly depends on three factors, the purchase quantity, the specification shape, and the tolerance. The smaller the quantity, the higher the quotation; the more complex the shape, the higher the processing cost; the stricter the tolerance requirements, the higher the processing cost.

Obviously, different materials will naturally affect the price. Usually, the price of NdFeB is definitely higher than that of ferrite. In addition, NdFeB is not corrosion-resistant, and usually needs to be protected by coating. Common coatings are nickel plating, zinc plating, epoxy resin. Choosing a good coating is another cost.

Another example is sintered NdFeB, the price will change with the temperature requirements, the higher the performance, the higher the price.

Finally, and most importantly, the price of magnet raw materials has also been fluctuating.

If you have more questions, feel free to leave us a message, we look forward to communicating with you.

If you've ever purchased a NdFeB magnet, you surely know that almost all NdFeB magnets have a coating, so why don't ferrite magnets need a coating?

First of all, let us know about ferrite magnets, which are non- metallic magnetic materials, also known as magnetic ceramics, so there is basically no corrosion problem. It can be seen everywhere in life. For example, the speaker magnet in the radio is a ferrite magnet.

The magnetic performance of ferrite is not high. It is hard and brittle, but at the same time, it has many advantages,it is not easy to demagnetize, not easy to corrode, and it is cheap.

Similar to ceramics, it is generally formed by molds and sintered, and it is difficult to be machined, so most ferrite products have simple shapes and large dimensional tolerances.

Surface magnetism, also known as surface magnetic field, refers to the magnetic induction intensity at a

certain point on the surface of the magnet, and the unit is Gauss Gs or Tesla T (1T=10000Gs).

The parameter of surface magnetism is easy to measure. When the size of the magnet is determined, people

often judge the performance of the magnet by comparing the surface magnetism. When encountering some

magnets that are not suitable for routine measurement, particularly large or small, and special shapes,surface  magnetic measurement is particularly important.

But we need to know that the surface magnetism is the value measured by the Gauss meter in contact with a certain point on the surface of the magnet. The measurement point does not cover the entire surface of the product. The surface magnetism of different positions on the surface of the magnet is different, so take a certain point The value to measure the value of the entire face is incorrect For non-multipole magnetized and regular-shaped magnets, the central surface magnetism is generally measured.

The surface magnetism is easily affected by the external environment. When measured in different environments, the measured surface magnetism may be different. For the same magnet, using Gaussmeters from different manufacturers, the measured central surface magnetism may be different. The central surface magnetism of the N pole and S pole of the same magnet is also different. And don't forget that every gauss meter has an error of around 2%. 

It can be seen that the surface magnetic measurement is not objective, and it is not a parameter that can fully reflect the performance of the magnet. Therefore, it is usually not recommended as an evaluation indicator for product transactions.

We have been trading in the magnet industry for many years. A small number of customers indicated that the magnetic force of the permanent magnets they purchased was attenuated, and they usually suspected that it was the quality of the product itself. In fact, the quality of our products can stand the test of the market.Today let’s take a look at what factors lead to demagnetization of permanent magnets:

1. Mechanical vibration and impact cause demagnetization.

2. High temperature demagnetization, the increase in use temperature will cause the magnet to demagnetize.

3. The change of the external current magnetic field causes demagnetization.

4. External magnetic field interference causes demagnetization.

Press Brake Tools are tools that play a key role in the field of metalworking. They are used to bend and shape-change metal materials. As manufacturing technology and market demand continue to develop, Press Brake Tools are also evolving and innovating. This blog will explore the latest trends and technological innovations in Press Brake Tools, take you to the forefront of the industry, and provide more efficient and precise solutions for your metalworking work.

 

As an indispensable tool in modern industrial production, bending machine molds play a key role. In this blog, we will take a deep look at the definition, application and innovation of bending machine molds, and explore their infinite possibilities in achieving precise bending and production efficiency.

 

1. Definition and principle of press brake dies

Bending machine molds are tools used to process metal materials, which bend materials such as metal sheets into the desired shape by applying force. It consists of an upper mold and a lower mold, and the bending operation is completed by the movement of the upper and lower molds. The design and manufacture of bending machine molds need to consider factors such as material strength, elasticity, and processing accuracy to ensure accurate bending results.

 

2. Application fields of press brake tools

Bending machine molds are widely used in various industrial fields, including automobile manufacturing, aerospace, construction, home appliances, shipbuilding, etc. They are used to make various metal products such as body parts, components, equipment housings, etc. The accuracy and stability of bending machine molds are essential to ensure product quality and production efficiency.

 

3. Innovation and development trend of press brake tooling

With the continuous advancement of industrial technology, bending machine molds are also constantly innovating and developing. By adopting advanced materials and manufacturing processes, the hardness, wear resistance and life of the mold are improved. The application of digital technology makes the mold design more precise and efficient. The introduction of automation features improves the efficiency and stability of the production line.

 

4. Quality control and maintenance of bending machine molds

In order to ensure the performance and life of bending machine molds, quality control and regular maintenance are very important. Strict quality inspection and testing ensure the accuracy and stability of the mold. Regular cleaning and lubrication can extend the service life of the mold and ensure its normal operation.

 

The wide application and continuous innovation of bending machine molds have brought great convenience and benefits to modern industrial manufacturing. We are passionate about the research and development and application of bending machine molds, and continue to work hard to promote the improvement of their technical level and performance. I believe that with the further development of technology, bending machine molds will continue to play an important role in promoting the progress and development of industrial manufacturing.

 

We are committed to providing high-quality bending machine molds and working closely with customers to provide them with customized solutions. If you have any needs or inquiries about bending machine molds, please feel free to contact us and we will serve you wholeheartedly.