Multi-outlet square magnetic mold

Abstract

The application discloses a one-cavity multi-out square magnetic mold, which comprises an upper mold, a lower mold and a plurality of lower punches, the upper mold comprises an upper magnetic guide column, the upper magnetic guide column is wrapped by a non-magnetic layer of the upper mold, the lower mold is provided with a plurality of lower punches, the plurality of lower punches are located in the same lower mold cavity, the plurality of lower punches are spaced apart from each other through a spacer sleeve, an alloy sleeve is arranged on the inner wall of the lower mold cavity, the cavity of the lower mold is divided into a plurality of independent stamping cavities through the alloy sleeve and the spacer sleeve, the plurality of lower punches are respectively located in the plurality of independent stamping cavities, and the upper magnetic guide column completely covers the plurality of independent stamping cavities. The one-cavity multi-out mode is changed from the original one-cavity one-out mode, space utilization can be improved, and production efficiency can be improved.

Description

Technical Field

[0001] This invention relates to a stamping die, and more particularly to a multi-cavity square magnetic die. Background Technology

[0002] Permanent magnets (such as neodymium iron boron magnets) are widely used in various fields including electronics, electrical engineering, machinery, transportation, medical care, and daily necessities. There are several methods for producing permanent magnets, but currently, die stamping is widely used due to its high production efficiency and stable, reliable product quality. This method generally involves placing the permanent magnet material in a mold and stamping it into different shapes, such as squares, to obtain a cube magnet.

[0003] like Figure 1 As shown, the block magnet mold currently used for producing block magnets mainly consists of an upper mold, a lower mold, and a lower punch. The lower punch consists of an upper non-magnetic alloy layer 5 (e.g., a Stellite alloy layer) and a lower magnetic guide pillar 4. The alloy layer 5 and the lower magnetic guide pillar 4 are located inside the lower mold cavity 3. To reduce the wear on the inner wall of the cavity 3 when the lower punch moves, a hard alloy sleeve 2 is provided between the lower punch and the inner wall of the cavity 3. The upper mold has a magnetic guide pillar 1 positioned directly opposite the cavity 3. The cross-sectional area of ​​the upper mold magnetic guide pillar 1 is the same as that of the lower magnetic guide pillar 4. This makes the cross-sectional areas of the magnetic guide surfaces on the upper and lower surfaces of the blank 6 comparable, thereby ensuring that the magnetic flux intensity on the upper and lower surfaces is the same and guaranteeing the consistency of the surface magnetic properties on the upper and lower surfaces of the block magnet. Figure 1 The diagram shows a single-cavity, single-outlet mold design, where one green blank 6 is pressed within a single lower mold cavity. On one hand, the hard alloy sleeve 2 and the upper magnetic post 1 require a certain amount of space, resulting in low space utilization and low production efficiency for the single-cavity, single-outlet block magnetic mold design. On the other hand, the upper magnetic post 4 is generally fixed to the non-magnetic layer 7 of the upper mold by means of bonding, etc. During the stamping process, the upper magnetic post 1 needs to be subjected to downward pressure to prevent the upper mold from moving. Under this downward pressure, the upper magnetic post 1 is prone to detaching from the non-magnetic layer 7. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a multi-cavity, multi-outlet square magnetic mold.

[0005] A multi-cavity block magnetic mold includes an upper mold, a lower mold, and multiple lower punches. The upper mold includes an upper magnetic post, which is wrapped by a non-magnetic layer of the upper mold. The lower mold has multiple lower punches, all located within the same lower mold cavity. The multiple lower punches are separated from each other by spacers. An alloy sleeve is provided on the inner wall of the lower mold cavity. The alloy sleeve and the spacers divide the cavity of the lower mold into multiple independent stamping cavities. The multiple lower punches are located within the multiple independent stamping cavities, and the upper magnetic post completely covers the multiple independent stamping cavities.

[0006] Optionally, the plurality of stamping cavities are identical; or the plurality of stamping cavities are different; the upper magnetic post at least partially covers the alloy sleeve on the lower die; the lower punch includes a lower non-magnetic layer and a lower magnetic post, the lower non-magnetic layer and the lower magnetic post being fixedly connected; the lower non-magnetic layer includes a top block and an arc-shaped protrusion, the arc-shaped protrusion having an arc-shaped convex surface, the protrusion direction of the arc-shaped protrusion facing the lower magnetic post; the arc-shaped protrusion is integrally formed with the top block; an arc-shaped concave surface matching the arc-shaped convex surface is formed on the lower magnetic post, the lower non-magnetic layer and the lower magnetic post are joined together by the matching arc-shaped convex surface and arc-shaped concave surface; the total area of ​​the arc-shaped convex surface is equal to the cross-sectional area of ​​the upper magnetic post; there are two stamping cavities.

[0007] The beneficial effects of the present invention are as follows: The present invention provides a block magnetic mold with multiple outlets in one cavity. This mold changes the original single outlet method to a multi-outlet method, which can improve space utilization and increase production efficiency. At the same time, the design of the non-magnetic layer of the lower punch avoids the increase in magnetic difference between the upper and lower surfaces caused by the increase in the area of ​​the magnetic column of the upper mold. Attached Figure Description

[0008] Figure 1 A schematic diagram of a single-cavity, single-outlet square magnetic mold; Figure 2 This is a schematic diagram of the multi-cavity square magnetic mold structure in Example 1; Figure 3 This is a schematic diagram of the lower punch structure; Figure 4 This is a schematic diagram of the multi-cavity square magnetic mold structure in Example 2. Detailed Implementation

[0009] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the above and other objects, features, and advantages of the present invention will become clearer. In all the drawings, the same reference numerals indicate the same parts. The drawings are not intentionally drawn to scale; the focus is on illustrating the main points of the invention.

[0010] The terms and words used in the following description and claims are not limited to their literal meaning, but are intended solely by the inventors to provide a clear and consistent understanding of the invention. Therefore, it will be apparent to those skilled in the art that the following description, which provides various embodiments of the invention, is for illustrative purposes only and not for limiting the invention as defined by the appended claims and their equivalents.

[0011] It should be understood that the singular forms “a,” “an,” and “the” include plural objects unless the context explicitly indicates otherwise. Thus, for example, referring to a “module” includes referring to one or more such modules. The advantages and features of the invention, as well as methods of implementing the invention, can be more readily understood by referring to the detailed description and accompanying drawings of the embodiments below. However, the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the invention will be thorough and complete, and fully convey the concept of the invention to those skilled in the art.

[0012] Example 1 See Figure 2 The multi-cavity block magnetic mold of the present invention includes an upper mold, a lower mold, and multiple lower punches. The upper mold includes an upper magnetic post 1, which is wrapped by a non-magnetic layer 7. The lower mold has multiple punches, all located within the same lower mold cavity 3, and separated from each other by spacers 9. A hard alloy sleeve 2 is provided on the inner wall of the lower mold cavity 3. Thus, the lower mold cavity 3 is divided into multiple independent stamping cavities by the alloy sleeve 2 and the spacers 9. The upper magnetic post 1 completely covers these multiple independent stamping cavities, for example in... Figure 2 The device has a first stamping cavity 8 and a second stamping cavity 10, which are the same size. The upper magnetic post 1 completely covers the first stamping cavity 8 and the second stamping cavity 10. The green blank 6 is placed in the stamping cavity and stamped by the punch. Since there are multiple punches and stamping cavities, two square magnets can be produced in one stamping process, which greatly improves the production efficiency.

[0013] exist Figure 2 The invention illustrates a scheme with two stamping cavities, but those skilled in the art should understand that the number of stamping cavities in this invention can also be three, four, etc., with the same principle as two stamping cavities. This invention is merely illustrative of the principle using two stamping cavities and is not intended to limit the number of stamping cavities in this invention; similarly, although Figure 2 The diagram only shows a scheme with one alloy sleeve, but the number of alloy sleeves 2 can also be multiple, such as 2, 3, 4, etc.

[0014] Furthermore, in addition to completely covering these multiple independent stamping chambers, the upper magnetic post 1 can have a larger cross-sectional area, for example, in... Figure 2 The upper magnetic post 1 at least partially covers the alloy sleeve 2 on the lower die. In this way, during the stamping process, the hard alloy sleeve 2 can provide support for the upper magnetic post 1. With the support of the alloy sleeve 2, the upper magnetic post 1 can be effectively prevented from being pressed out from the non-magnetic layer 7 of the upper die.

[0015] In the above scheme, the upper magnetic post 1 and the lower mold cavity 3 are widened, and the hard alloy sleeve 2 is changed to multiple cavities, so that multiple lower punches are equipped in one cavity 3. However, since the cross-sectional area of ​​the upper magnetic post 1 is larger than the cross-sectional area of ​​the lower punch, the difference in magnetic flux density between the upper and lower surfaces of the green blank 6 will increase, and the magnetic declination of the outer side of the green blank is significantly larger than that of the inner side, resulting in poor surface magnetic consistency of the upper and lower surfaces of the square magnetic green blank produced by one cavity with multiple molds.

[0016] To overcome the above problems, please refer to the following: Figure 2 and Figure 3 This invention further improves the lower punch. The lower punch includes a lower non-magnetic layer 5 and a lower magnetic pillar 4, which are fixedly connected. The lower non-magnetic layer 5 includes a top block 5.1 and an arc-shaped protrusion 5.2, with the protrusion direction of the arc-shaped protrusion 5.2 facing the lower magnetic pillar 4. The arc-shaped protrusion 5.2 and the top block 5.1 can be integrally formed or manufactured separately and then fixedly connected. The arc-shaped protrusion 5.2 can completely cover the top block 5.1 and has an arc-shaped convex surface 5.3 with an area of ​​S1. Correspondingly, an arc-shaped concave surface 4.1 matching the arc-shaped convex surface 5.3 is formed on the lower magnetic pillar 4. The lower non-magnetic layer 5 and the lower magnetic pillar 4 are joined together by the matching arc-shaped convex surface 5.3 and arc-shaped concave surface 4.1.

[0017] For further details, please refer to [link / reference]. Figure 2 The upper magnetic post 1 can have a cross-sectional area of ​​S0, while multiple punches each have an arc-shaped convex surface with the same area, the sum of which is equal to S0. Figure 2 For example, it has a first stamping chamber 8 and a second stamping chamber 10. The punches in these two stamping chambers have arc-shaped convex surfaces with an area of ​​S1 and arc-shaped convex surfaces with an area of ​​S2, respectively, where S0 = S1 + S2.

[0018] In this invention, while setting up multiple stamping chambers, the lower non-magnetic layer 5 of the lower punch is changed to a convex shape. The size of the green blank is the same as the original green blank, and the thickness of the non-magnetic layer in the center is large. This reduces the thickness of the non-magnetic layer at the edge, and the magnetic circuit passes through this area first, thereby reducing the deflection of the magnetic field and ensuring the consistency of the surface magnetic properties of the upper and lower surfaces of the square magnetic green blank produced by the one-cavity two-outlet mold.

[0019] This invention changes the single-cavity, single-exit mold to a multi-cavity, single-exit mold, which increases the cross-sectional area of ​​the upper magnetic post 1. Furthermore, the alloy sleeve 2 covering the upper magnetic post 1 further increases its cross-sectional area. This leads to a greater difference in the cross-sectional area between the stamping cavity and the upper magnetic post 4, resulting in poorer surface magnetic uniformity on the upper and lower surfaces of the green blank. This invention addresses this with the aforementioned arc-shaped convex surface 5.3. The area of ​​the arc-shaped convex surface 5.3 is relatively increased, ensuring that the sum of the areas of all the arc-shaped convex surfaces 5.3 within the same cavity is equal to the cross-sectional area of ​​the upper magnetic post 4, thus guaranteeing surface magnetic uniformity on the upper and lower surfaces of the green blank. Simultaneously, this arc-shaped convex design can withstand greater pressure, facilitating green blank stamping. Moreover, the arc design aligns with the distribution of the green blank's magnetic field, preventing localized magnetic field concentration and ensuring a more uniform magnetic field distribution on each stamping surface of the green blank, thereby improving product quality.

[0020] by Figure 2 Taking a single-cavity, two-outlet mold as an example, if a punch with a uniform thickness and a non-magnetic layer is used, the magnetic difference between the upper and lower surfaces of the green blank is about 9.1%; after changing to a convex non-magnetic layer punch, the magnetic difference between the upper and lower surfaces of the green blank is reduced to 3.2%, ensuring the consistency of the surface magnetic properties of the upper and lower surfaces of the green blank.

[0021] Example 2 This embodiment focuses on its differences from Embodiment 1, while the similarities will not be repeated. In Embodiment 1, cavity 3 has multiple identical stamping cavities, which means that the scheme of Embodiment 1 can only produce one type of block magnet, and its adaptability is not strong.

[0022] like Figure 4 As shown, in this embodiment, cavity 3 also has multiple stamping chambers. The difference from embodiment 1 is that these stamping chambers can be different and have different cross-sectional areas. For example... Figure 2 As shown, taking two stamping chambers as an example, the cross-sectional area of ​​the first stamping chamber 8 is smaller than that of the second stamping chamber 10, so that two different types of square magnets can be stamped out, thus improving its adaptability.

[0023] It should be noted that although the cross-sectional areas of the different stamping cavities are different in this embodiment, the sum of the areas of the arc-shaped convex surfaces in these different stamping cavities is equal to the cross-sectional area of ​​the upper magnetic post 1. That is, in Figure 4 The condition also satisfies: S0 = S1 + S2.

[0024] While the technology has been described and illustrated with respect to one or more embodiments, changes and / or modifications may be made to the illustrated examples without departing from the spirit and scope of the appended claims. In particular, with respect to the various functions performed by the aforementioned components or structures (components, devices, circuits, systems, etc.), the terminology used to describe such components (including references to “apparatus”) is intended to correspond to any component or structure performing the specified function of the described component (e.g., functionally equivalent), even if structurally not equivalent to the disclosed structure performing the function of the illustrated embodiments described herein, unless otherwise specified. Furthermore, while a particular feature may have been disclosed with respect to one of several embodiments, such feature may be combined with one or more other features in other embodiments as may be desired and advantageous for any given or particular application. Moreover, with regard to the use of the terms “comprising,” “including,” “having,” “containing,” “comprising,” or variations thereof in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “comprising.”

[0025] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A multi-cavity, multi-outlet square magnetic mold, characterized in that, The device includes an upper die, a lower die, and multiple lower punches. The upper die includes an upper magnetic post, which is wrapped by a non-magnetic layer of the upper die. The lower die has multiple lower punches, all located within the same lower die cavity. The multiple lower punches are separated from each other by spacers. An alloy sleeve is provided on the inner wall of the lower die cavity. The alloy sleeve and the spacers divide the cavity of the lower die into multiple independent stamping cavities. The multiple lower punches are located within the multiple independent stamping cavities, and the upper magnetic post completely covers the multiple independent stamping cavities. The upper magnetic post at least partially covers the alloy sleeve on the lower mold; The lower punch includes a lower non-magnetic layer and a lower magnetic pillar, which are fixedly connected. The lower non-magnetic layer includes a top block and an arc-shaped protrusion, the arc-shaped protrusion having an arc-shaped convex surface, and the protrusion direction of the arc-shaped protrusion facing the lower magnetic post; The arc-shaped protrusion is integrally formed with the top block; An arc-shaped concave surface matching the arc-shaped convex surface is formed on the lower magnetic post, and the lower non-magnetic layer and the lower magnetic post are joined together by the matching arc-shaped convex surface and arc-shaped concave surface; The total area of ​​the arc-shaped convex surfaces is equal to the cross-sectional area of ​​the upper magnetic post.

2. The block magnetic mold according to claim 1, characterized in that, The multiple stamping cavities are identical.

3. The block magnetic mold according to claim 1, characterized in that, The multiple stamping cavities are different.

4. The block magnetic mold according to claim 1, characterized in that, There are two stamping chambers.

Images