High-temperature-resistant moisture-proof material box for neodymium iron boron grain boundary diffusion
By using stainless steel box with specific thickness and material, the side wall reinforcement and bottom groove design, the problem of easy oxidation and deformation of the material box in NdFeB production is solved, and the stability and cost-effectiveness of the high-temperature cutting box are achieved.
Patent Information
- Application Number
- CN202423068171.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-12-12
AI Technical Summary
During the existing production process of neodymium iron boron, graphite cartridges are prone to moisture absorption and oxidation, fragile and fragile, molybdenum cartridges are costly and easily broken, and stainless steel cartridges are prone to deformity and thermal expansion and contraction at high temperatures, resulting in unstable product performance and high cost.
The material box is made of stainless steel plates with a specific range of thickness and material. The side wall reinforcement part forms a "Z"-shaped structure through sheet metal bending, and a "work"-shaped through groove is set at the bottom to enhance the strength of the material box and prevent high-temperature deformation. Combined with the moisture-proof performance of stainless steel, it ensures stability.
It achieves the stability and strength improvement of the cutting box at high temperature, prevents deformation, reduces costs, and is suitable for neodymium iron boron grain boundary diffusion process, with superior applicability and economicality.
Smart Images
Figure CN223291293U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of material boxes for NdFeB production, and particularly relates to a high-temperature resistant and moisture-proof material box used for NdFeB grain boundary diffusion. Background Art
[0002] Neodymium iron boron permanent magnets (NdFeB) possess excellent magnetic properties and are widely used in motors, electronics, energy, and other fields. Grain boundary diffusion is a key step in the production of NdFeB permanent magnets and must be performed at high temperatures. Currently, the main loading boxes commonly used in the industry are graphite and molybdenum. Graphite easily absorbs moisture, and a humid environment can cause oxidation of NdFeB products, affecting product performance and even causing them to be scrapped. Graphite is also fragile and easily dented and broken, making it difficult to store and transport. Furthermore, graphite is more expensive than stainless steel. Molybdenum, on the other hand, is much more expensive than both stainless steel and graphite, resulting in very high costs for molybdenum boxes. Molybdenum is also very hard, difficult to process, and has high manufacturing costs. Molybdenum becomes brittle and easily breaks at high temperatures, shortening its service life.
[0003] Some manufacturers currently use lower-cost stainless steel to make their boxes. However, simple boxes made of stainless steel lose strength at high temperatures. If the thickness is insufficient or the structure is not properly designed, the box can easily deform. Furthermore, stainless steel expands and contracts during heating and cooling, potentially causing the box to deform or even damage.
[0004] Therefore, based on some of the above situations in the prior art, this application has been further designed and improved. Utility Model Content
[0005] In order to solve the above technical problems, the present invention solves them through the following technical solutions.
[0006] A high-temperature, moisture-resistant, and durable material box for NdFeB grain boundary diffusion is constructed from stainless steel sheet material and includes a bottom wall, several side walls, and an open top. The side walls are reinforced near the top, and the reinforcements of adjacent side walls are welded together. The reinforcements effectively enhance the box's strength and prevent deformation under high temperatures. The bottom wall is provided with three through-slots arranged in an "I" shape. This "I"-shaped design prevents deformation of the box due to thermal expansion and contraction, ensuring its stability.
[0007] As a preferred technical solution for a high-temperature and moisture-proof material box for NdFeB grain boundary diffusion, specifically, the stainless steel plate is made of 201 or 304 with a thickness greater than 2.0 mm. This material and thickness design can ensure the strength and high-temperature resistance of the material box.
[0008] As a preferred technical solution for a high-temperature and moisture-proof material box for NdFeB grain boundary diffusion, the stainless steel plate is specifically made of 310S material with a thickness greater than 1.2 mm. This material and thickness design can ensure the strength and high-temperature resistance of the material box.
[0009] As a preferred technical solution for a high-temperature, moisture-resistant cartridge for NdFeB grain boundary diffusion, the reinforcement portion has a Z-shaped cross-section, formed by bending the upper end of the side wall three times. This design effectively enhances the cartridge's strength and prevents deformation at high temperatures.
[0010] As an optimal technical solution for a high-temperature-resistant and moisture-proof material box for NdFeB grain boundary diffusion, specifically, the through-slot width is 0.5 mm. This design can ensure that the deformation of the material box is moderate during thermal expansion and contraction, preventing deformation while ensuring sealing.
[0011] Compared with the prior art, the present application has the following beneficial effects: it can effectively enhance the strength of the material box and prevent high-temperature deformation, thereby ensuring the stability of the material box, and it is low-cost, which is conducive to mass production and use. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a three-dimensional schematic diagram of the material box.
[0013] Figure 2 A top view of the material box.
[0014] Figure 3 It is a partial cross-sectional view of the material box.
[0015] The following is a description of the symbols in the drawings of the specification:
[0016] 1. Bottom wall; 2. Side wall; 3. Reinforcement portion; 4. Through groove. DETAILED DESCRIPTION
[0017] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.
[0018] In the following embodiments, the same or similar numbers throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.
[0019] In the description of the present invention, it should be understood that the terms: center, longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as limiting the present invention. In addition, the terms: first, second, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features shown. In the description of the present invention, unless otherwise clearly specified and limited, the terms: install, connect, connect, etc. should be understood in a broad sense, and ordinary technicians in this field can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0020] Reference Figures 1 to 3 This utility model patent provides a high-temperature resistant and moisture-proof material box for NdFeB grain boundary diffusion, which has a simple structure and a convenient manufacturing process. The material box is made of stainless steel plates, and plates of different thicknesses and materials can be selected according to needs, such as 201 or 304 plates with a thickness greater than 2.0 mm, or 310S plates with a thickness greater than 1.2 mm. The side wall 2 of the material box is provided with a reinforcement part 3 near the top, and the reinforcement part 3 is formed by bending the upper end face of the side wall 2 three times by sheet metal to form a structure approximately in the shape of a "Z", which can effectively enhance the strength of the material box and prevent deformation at high temperatures. There are three through slots 4 at the bottom of the material box, and the three through slots 4 are distributed in the shape of an "I". The width of the through slots 4 is 0.5 mm. This size selection can ensure that the deformation of the material box is moderate during thermal expansion and contraction.
[0021] The manufacturing process of the material box described in this application is as follows: a stainless steel sheet is cut to the desired size. The upper end surface of the side wall 2 is bent three times using a bending machine to form a reinforcement 3. The bottom wall 1 is welded to the side wall 2 and the reinforcement 3 to form the material box body. A through groove 4 is machined in the bottom wall 1.
[0022] When storing the product, the container can be sealed with a graphite lid to prevent oxygen from the chamber from affecting the product. The thickness of the graphite lid can be adjusted as needed, for example, from 2 to 10 mm. The dimensions of the container can be customized according to actual needs, for example, with a length range of 100 to 1000 mm, a width range of 50 to 800 mm, and a height range of 10 to 200 mm. The width of the through slot 4 can also be adjusted as needed, for example, from 0.1 to 2 mm.
[0023] The material box described in this utility model is made of stainless steel sheet material, which has excellent high-temperature resistance and is suitable for the NdFeB grain boundary diffusion process at approximately 900°C. Compared with graphite and molybdenum boxes, stainless steel material boxes are inexpensive, easy to process, and have low manufacturing costs. Furthermore, stainless steel does not absorb moisture, effectively preventing moisture from oxidizing the NdFeB product. Furthermore, the design of the reinforcement portion 3 effectively enhances the strength of the material box, preventing deformation at high temperatures and ensuring product safety.
[0024] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field fall within the protection scope of the present invention.
Claims
1. A high temperature resistant and moisture proof material box for NdFeB grain boundary diffusion, characterized in that: The invention is made of a stainless steel plate, comprising a bottom wall (1) and a plurality of side walls (2), with an opening at the top. The side walls (2) are provided with a reinforcement portion (3) near the top, and the reinforcement portions (3) of adjacent side walls (2) are welded together. The bottom wall (1) is provided with three through grooves (4), and the three through grooves (4) are distributed in an "I" shape.
2. A high temperature resistant and moisture proof material box for NdFeB grain boundary diffusion according to claim 1, characterized in that: The stainless steel plate is made of 201 or 304 material with a thickness greater than 2.0 mm.
3. The high temperature resistant and moisture proof material box for NdFeB grain boundary diffusion according to claim 1, characterized in that: The stainless steel plate is made of 310S material with a thickness greater than 1.2 mm.
4. The high temperature resistant and moisture proof material box for NdFeB grain boundary diffusion according to claim 1, characterized in that: The reinforcing portion (3) has a structure with a cross section that is approximately "Z"-shaped, and is formed by bending the upper end surface of the side wall (2) three times by means of sheet metal.
5. The high temperature resistant and moisture proof material box for NdFeB grain boundary diffusion according to claim 1, characterized in that: The through groove (4) has a width of 0.5 mm.