Smartphones have boosted the speed of 4G, and in turn, the 4G era has also cultivated major mobile phone brands. In the 5G period, there will be new changes to smartphones. The comprehensive screen, wireless charging, and screen fingerprints are new features that are currently revealed. Compared to full-screen and under-the-screen fingerprints, wireless charging may not be favored by many people, but it may be the most widely used one. It should be said that the meaning of wireless charging in the 5G period is much larger than that of the full screen and the screen.

Since the RF components and antennas used in 4G have not been able to meet the 5G request, the internal accessory space has been further squeezed, which saves the province and may become a feature of the early 5G mobile phone.

At the same time, as the mobile phone becomes thinner and lighter, there is an imagination in the 5G period to cancel the charging socket of the mobile phone, and only save the speaker hole, and the maximum level is applied to the center of each inch inside the mobile phone. In this way, wireless charging becomes a more suitable alternative.

In addition, due to the increase in network speed during the 5G period, mobile phone battery durability has further declined. At present, users who feel that their mobile phone life is too short and whose power is basically insufficient are likely to be more and more obvious during the 5G period. The fragmented charging time advocated by wireless charging is the most feasible technology at the moment, and it does not conflict with 5G.

Ferrite is the most important material in wireless charging, and its processing technology has attracted much attention. The following small series will talk with you about the processing difficulties and processing techniques of die-cutting of ferrite magnetic materials :

What is ferrite?

Ferrite is a metal oxide having ferromagnetism. In terms of electrical properties, the resistivity of ferrite is much larger than that of metals and alloys, and it also has higher dielectric properties.

The magnetic properties of ferrites also show higher magnetic permeability at high frequencies. Therefore, ferrite has become a non-metallic magnetic material commonly used in the field of high frequency and weak electricity. Since the magnetic energy stored in the unit volume of ferrite is low, the saturation magnetization is also low (usually as long as 1/3 to 1/5 of pure iron), thus limiting its low-frequency power and high-energy density. The application of the field of great power.

Classification of ferrite

Ferrites are sintered from iron oxides and other ingredients. Ordinary can be divided into three types: permanent ferrite, soft ferrite and spin ferrite.

The ferrite magnet is also called ferrite magnet, which is a small black magnet that we usually see. The raw materials of the composition are mainly iron oxide, barium carbonate or barium carbonate. After magnetization, the strength of the residual magnetic field is high and the residual magnetic field can be adhered to for a long time. Usually used as a permanent magnet material. For example: speaker magnet.

The soft ferrite is made by sintering iron oxide and one or several other metal oxides. It is called soft magnetic because the residual magnetic field is small or simply absent after the magnetizing magnetic field has disappeared. Usually used as a choke, or core of an intermediate frequency transformer.

Spin ferrite refers to ferrite data having a gyromagnetic property. The gyromagnetic of the magnetic material die-cutting refers to the phenomenon that the polarization plane of the plane-polarized electromagnetic wave rotates in the propagation direction from time to time during the propagation of the plane-polarized electromagnetic wave in a certain direction under the action of two mutually perpendicular DC magnetic fields and electromagnetic wave magnetic fields. Rotating ferrite has been widely used in the field of microwave communication.

Ferrite & Wireless Charger

With the widespread use of wireless charging, the demand for the use of magnetic data is growing. However, the processing difficulties of magnetic data are also exposed between consumer processing manufacturers. With regard to the processing difficulties of magnetic data, we can fully understand from the data characteristics of magnetic data that there are mainly several aspects of its processing difficulties.

▷ ferrite raw material

The data characteristics of the ferrite raw material are: the raw sheet has no toughness, poor adhesion, easy to be broken, slag, dust, and the effect of force, easy to break. The processing request is to stop cutting, stripping, stacking, and dust removal. At present, the common method is mostly manual work, which is difficult to constitute an automated operation.

▷ Ferrite magnetic sheet

The characteristics of the ferrite magnetic sheet: This data is highly fragile. The data is mainly for sheet shipment. The data split does not break with the direction of force. It is difficult to slice and break the request during processing. After the crushing, stop the second die cutting. There is a phenomenon that it is difficult to take a film, and the magnetic sheet is easy to overlap and it is difficult to separate.

▷ Ferrite magnetic separator

Ferrite magnetic separator: a magnetic material with high hardness, the material is block-shaped, it needs to be cut after the film is cut, the data hardness is large, the traditional processing method is easy to hurt the knife, and the sheet processing, traditional The processing method is inefficient.

纳米 Nanocrystalline data

Nanocrystalline data: An extremely fragile magnetic carrier data that does not follow the direction of force. When shipped, there is no internal support for the core. The common processing method is as follows: the carrier tape is stopped after the double-sided adhesive is applied, and the crushing operation is stopped, and the grinding is performed without scratching, and the internal cracking specifications of the magnetic sheet are average. After the fracture is requested, the composite multilayer is requested to stop the die-cutting deep processing, and the punching does not allow the burr to be presented.

Difficulties in die cutting of ferrite magnetic materials

This kind of material is presented in the form of a sheet. The thickness is thin, the quality is heavy, and the height is fragile. A little force is generated during the process of lifting with a finger. Breaking under normal force conditions does not crack in the direction of force. In order to stop the double-layer edging like graphite sheets, the main difficulties in processing are as follows:

1. The original data is difficult to extract and feed;

2. How to complete batch automated patching operations;

3, the demand to stop positioning die-cutting, avoiding the gap, black and black glue to the stickers, can not stop effective positioning;

4, the product is opened in the middle, it must be punched in the whole section, it is difficult to discharge, affecting the tool life;

5, the demand for the handle color identification, punching the handle.

Today, we will use the ferrite die-cutting process to do technical analysis for everyone. If you have better opinions, send a message to share with us!