How to communicate requirements with magnetic material sales personnel?
The procurement requirements for magnets are mainly divided into two parts: the basic requirements for magnets and the requirements for project delivery time.https://chinese.alibaba.com/product-detail/HC004B-Single-Pole-Parylene-Coating-Round-60830071185.html
When we want to clearly explain the procurement requirements of a magnet, there are several key points that need to be clarified: performance requirements, shape and size, magnetization direction, and surface treatment requirements. It is best for the purchaser to provide drawings of the magnet. Let's take neodymium iron boron permanent magnets as an example to explain in detail.
1. Performance requirements: Refers to the brand requirements of the magnet. There are many suppliers in the magnetic material industry, and each company has different definitions and performance ranges for the same grade. When communicating grades, it is recommended that both the supply and demand sides clarify the residual magnetism Br and intrinsic coercivity Hcj of the corresponding grade, so as to avoid deviation. If the purchaser is not clear about the product grade, they need to provide some auxiliary judgment indicators, such as surface magnetism, tensile strength, magnetic flux/magnetic moment, etc. In addition, based on factors such as the working environment of the magnet, it is also possible to further clarify indicators such as remanence and coercivity temperature coefficient. If there are clear requirements for magnetic flux and other indicators, testing equipment and methods should be agreed upon as the criteria for judgment.
2. Shape, size, and magnetization direction:
When describing procurement requirements, the basic shape and size requirements of the magnet must be clearly defined, such as 6.0mm (+0.03/-0.03). For simple products, provide basic dimensions and tolerances for length, width, and height; For magnets with complex shapes, the requirements for contour and other angles (similar to the red marking of 30 °± 1 ° in the following figure) need to be provided more clearly. It is recommended to provide suppliers with clear drawings. In addition, the magnet also needs to be labeled with the orientation direction of the product (NS pole), the magnetization method (unipolar or multipole charging), and the magnetization angle.
3. Surface treatment requirements: The purchaser needs to specify the surface treatment method for the magnet, including coating methods (electroplating, chemical plating, electrophoresis, vapor deposition, etc.), coating materials (zinc, nickel, copper, aluminum, epoxy resin, etc.), and coating thickness. If there are requirements for salt spray or other tests, it is necessary to agree on the setting of testing conditions, placement time, and judgment criteria after the test.
4. Other requirements:
Such as appearance requirements, other testing requirements (such as aging tests, etc.), packaging requirements, transportation requirements, etc.
Most suppliers have a stock of magnet blanks for product delivery, which provides a certain reserve for universal performance. The shape of the magnet roughly determines the length of the product's delivery time. Customized products generally require specialized molds. If the manufacturer does not have a suitable size mold, there will be a mold making time, and the product delivery time will be extended to a certain extent. The overall construction period can be compressed, but it may not necessarily be able to fully deliver according to the ideal time of the purchaser. For products with urgent delivery times, it is necessary to place orders in advance.