Lower stamping die of magnetic die of ring magnetic product

Abstract

The utility model discloses a lower stamping die of a magnetic die of a ring magnetic product, which relates to the technical field of dies and comprises a lower stamping die body, a non-magnetic layer is arranged at the top of the lower stamping die body, the lower side of the non-magnetic layer is matched with the upper side of the lower stamping die body in shape, and an adjusting mechanism is arranged between the non-magnetic layer and the lower stamping die body. Due to the fact that the non-magnetic-conductive layer on the lower punching die body has large magnetic resistance, magnetic lines of force of an orientation magnetic field tend to converge towards the inner hole area of the lower punching die body, and therefore the ring magnet produced by the lower punching die has convergent magnetic field distribution, and the ring magnet product is prevented from cracking at the position. By means of the adjusting mechanism, downward pressing of the upper punching die on the slurry can be buffered in the injection molding process, the slurry gathering effect can be better, the situation that the internal arrangement sequence is disturbed and disordered due to instant strong pressure is avoided, and cracking of the ring magnetic product is further avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a lower punch die of a magnetic mold for a ring magnetic product. Background Art

[0002] As we all know, special ring magnetic products need to generate central Gauss through the convergence of magnetic lines of force. In traditional stamping dies, magnetic conductive materials are usually used to make the upper and lower templates of the die and the concave and convex parts of the die. However, when using magnetic materials or magnetic devices for stamping, the magnetic conductive materials will be affected by the magnetic field, resulting in some problems in the stamping process, such as die wear, product deformation, etc.

[0003] In order to solve these problems, some manufacturers have developed non-magnetic conductive layer molds. The upper and lower templates and concave and convex parts of this mold are made of non-magnetic conductive materials, such as stainless steel, copper, etc. These materials will not be affected by the magnetic field, so they can improve the above problems. However, the non-magnetic conductive layer mainly solves the magnetic field problem at the interface between the non-magnetic conductive layer and the mold, that is, the end face of the product. As for the inside of the product, under the instantaneous forming impact of the die, its internal structure will be destroyed and disordered under the strong impact, which will cause the internal of the subsequent products to be prone to cracking. Utility Model Content

[0004] The purpose of the utility model is to provide a lower punch die of a magnetic mold for a ring magnetic product to solve the following technical problems:

[0005] How to prevent cracking inside ring magnetic products.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A lower punch die of a magnetic mold for a ring magnetic product, comprising a lower punch die body, a non-magnetic conductive layer is provided on the top of the lower punch die body, the lower side of the non-magnetic conductive layer matches the shape of the upper side of the lower punch die body, and an adjustment mechanism is provided between the non-magnetic conductive layer and the lower punch die body;

[0008] When the upper punch is pressed on the non-magnetic conductive layer, the non-magnetic conductive layer can be buffered by the adjusting mechanism.

[0009] As a further solution of the utility model: the adjustment mechanism includes a plurality of evenly distributed and one-to-one corresponding slots and plug posts, the slots are opened at the top of the lower punch body, the plug posts are connected to the bottom of the non-magnetic conductive layer, the plug posts are correspondingly and movably arranged in the slots, and an elastic mechanism is arranged between the lower end of the plug post and the bottom surface of the slot;

[0010] When the lower end of the plug column moves toward the bottom of the slot, the elastic mechanism will produce elastic deformation.

[0011] As a further solution of the utility model: the elastic mechanism includes a spring, and the spring is arranged between the lower end of the plug post and the bottom surface of the slot.

[0012] As a further solution of the utility model: the elastic mechanism also includes a vertical rod, the vertical rod is fixedly connected to the center of the bottom surface of the slot, and the upper end of the vertical rod is movably inserted into the lower end of the plug column, and the spring is sleeved on the vertical rod.

[0013] As a further solution of the utility model: the material of the non-magnetic conductive layer is Stellite surfacing.

[0014] Beneficial effects of the utility model:

[0015] (1) The utility model assembles a lower punch body, a non-magnetic conductive layer, and accessories such as an upper punch body and a core rod designed using known technology into a complete set of forming molds for annular magnet products. Since the non-magnetic conductive layer on the lower punch body has a large magnetic resistance, the magnetic lines of force of the oriented magnetic field tend to converge toward the inner hole area of ​​the lower punch body. Therefore, the annular magnet produced by the lower punch has a convergent magnetic field distribution, and the magnetic field orientation meets the requirements of annular magnets. The non-magnetic conductive layer covering the upper part of the lower punch body can effectively alleviate the magnetic field gradient at the junction of the non-magnetic conductive layer and the lower punch body, thereby avoiding the annular magnet product from cracking at this location.

[0016] (2) During injection molding, the upper punch is driven downward by the hydraulic press to compact the slurry. At this time, the downward movement of the slurry exerts pressure on the non-magnetic layer, causing the non-magnetic layer to drive the plug to move downward, and the plug moves downward along the vertical rod. At this time, the spring is compressed to produce compressive elastic deformation. In this process, the downward pressure of the upper punch on the slurry is buffered, which can make the slurry gather better and prevent the internal arrangement sequence from being disturbed and disordered due to the instantaneous strong pressure, further avoiding the internal cracking of the annular magnetic product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram for referring to various dimensions in an embodiment of the utility model;

[0020] Figure 3 yes Figure 1 An enlarged structural diagram of the connection between the middle and lower punch body and the non-magnetic conductive layer;

[0021] Figure 4 It is a three-dimensional structural schematic diagram of an embodiment of the utility model.

[0022] In the figure: 100, lower punch body; 101, slot; 102, vertical rod; 103, spring; 200, non-magnetic conductive layer; 201, plug post. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 , 2 As shown in Figure 4, the utility model is a lower punch die of a magnetic mold for annular magnetic products, including a lower punch body 100. A longitudinal cylindrical through hole is provided in the middle of the lower punch body 100 to provide space for the installation of a core rod. A non-magnetic layer 200 is provided on the top of the lower punch body 100. The lower side of the non-magnetic layer 200 matches the shape of the upper side of the lower punch body 100, and the non-magnetic layer 200 and the lower punch body 100 are not in contact under normal conditions. The material of the non-magnetic layer 200 is Stellite surfacing; an adjustment mechanism is provided between the non-magnetic layer 200 and the lower punch body 100. When the upper punch is pressed on the non-magnetic layer 200, the non-magnetic layer 200 can be buffered by the adjustment mechanism.

[0025] The adjustment mechanism includes a plurality of groups of slots 101 and plug posts 201 that are evenly distributed and correspond to each other. In an embodiment of the utility model, four groups of slots 101 and vertical rods 102 are provided, wherein four slots 101 are evenly opened at the top of the lower punch body 100, and four plug posts 201 are connected to the bottom of the non-magnetic conductive layer 200. The plug posts 201 are movably inserted into the corresponding slots 101, and an elastic mechanism is provided between the lower end of the plug post 201 and the bottom surface of the slot 101. When the lower end of the plug post 201 moves toward the bottom of the slot 101, the elastic mechanism will produce elastic deformation, thereby playing a buffering role.

[0026] The specific structure of the elastic mechanism is not limited, and it only needs to meet the above-mentioned buffering effect. For example, in an embodiment of the utility model, the elastic mechanism includes a spring 103, and the spring 103 is arranged between the lower end of the column 201 and the bottom surface of the slot 101. Therefore, when the column 201 moves downward, the spring 103 will be pressed downward, causing the spring 103 to produce compressive elastic deformation, thereby playing a buffering role; when the column 201 moves upward, the spring 103 will generate an upward elastic force under the elastic action, thereby achieving elastic reset.

[0027] In order to improve the stability of the column 201 when it moves in the slot 101, the elastic mechanism also includes a vertical rod 102, which is fixedly connected to the center of the bottom surface of the slot 101, and the upper end of the vertical rod 102 is movably inserted into the lower end of the column 201; when the column 201 moves up and down, it will slide up and down along the vertical rod 102, thereby making the column 201 more stable when moving.

[0028] See also Figure 3 The upper and lower sides of the non-magnetic conductive layer 200 are both non-planar, wherein the inner diameter D1 of the non-magnetic conductive layer 200 is 20-30 mm, and in the embodiment of the present utility model, D1 is 24.8 mm; D2 is 30-40 mm, and in the embodiment of the present utility model, D2 is 36 mm; D3 is 50-60 mm, and in the embodiment of the present utility model, D3 is 57 mm; D4 is 65-70 mm, and in the embodiment of the present utility model, D4 is 70 mm; H1 is 1-5 mm, and in the embodiment of the present utility model, H1 is 2.0 mm; H2 is determined by H1, a2, and a3; a2 is 2-10°, and in the embodiment of the present utility model, a2 is 9°; a3 is 10-20°, and in the embodiment of the present utility model, a3 is 19°.

[0029] The working principle of this utility model:

[0030] The lower punch body 100, the non-magnetic layer 200 and the upper punch, core rod and other accessories designed using known technology are assembled into a complete set of forming molds for annular magnetic products. The forming mold is installed on the workbench of a magnetic field orientation hydraulic press. The ferrite slurry is added into the mold cavity formed by the lower punch body 100 and the core rod by an automatic scraping method. Under the action of the magnetizing magnetic field generated by the magnetizing system of the hydraulic press, the ferrite slurry particles are magnetized and oriented. At the same time, under the pressure of the hydraulic press, the slurry is gradually dehydrated into annular magnetic blanks. In this process, since the non-magnetic layer 200 on the lower punch body 100 has a large magnetic resistance, the magnetic lines of force of the oriented magnetic field tend to converge to the inner hole area of ​​the lower punch body 100. Therefore, the annular magnetism produced by the lower punch has a convergent magnetic field distribution, and the magnetic field orientation meets the requirements of annular magnetism. The non-magnetic layer 200 covering the lower punch body 100 can effectively alleviate the magnetic field gradient at the junction of the non-magnetic layer 200 and the lower punch body 100, thereby avoiding the cracking of the annular magnetic product at this point.

[0031] At the same time, the upper punch is driven downward by the action of the hydraulic press so that the slurry is compacted downward. At this time, the downward movement of the slurry creates pressure on the non-magnetic layer 200, so that the non-magnetic layer 200 drives the plug 201 to move downward, and the plug 201 moves downward along the vertical rod 102. At this time, the spring 103 is compressed and produces compressive elastic deformation. In this process, the downward pressure of the slurry by the upper punch is buffered, which can make the slurry gather better, and the internal arrangement order will not be disturbed and disordered due to the instantaneous strong pressure, further avoiding the cracking of the annular magnetic product.

[0032] The formed special ring magnet blanks are processed into ф61.0*21.5*13.1 ring magnet products according to the well-known high-temperature sintering, grinding, cleaning, appearance inspection and other processes. After testing, the central Gauss is 223.6mT, and the final product qualification rate is calculated to be 92.6%.

[0033] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", 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 utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present utility model. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A lower punch die of a magnetic mold for a ring magnetic product, comprising a lower punch die body (100), characterized in that: A non-magnetic conductive layer (200) is provided on the top of the lower punch body (100), the lower side of the non-magnetic conductive layer (200) matches the shape of the upper side of the lower punch body (100), and an adjustment mechanism is provided between the non-magnetic conductive layer (200) and the lower punch body (100); When the upper punch is pressed onto the non-magnetic conductive layer (200), the non-magnetic conductive layer (200) can be buffered by the adjustment mechanism.

2. The lower punch die of the magnetic mold for the ring magnetic product according to claim 1, characterized in that: The adjustment mechanism comprises a plurality of groups of slots (101) and plug posts (201) that are evenly distributed and correspond to each other. The slots (101) are provided at the top of the lower punch body (100). The plug posts (201) are connected to the bottom of the non-magnetic conductive layer (200). The plug posts (201) are movably inserted into the slots (101) and an elastic mechanism is provided between the lower end of the plug posts (201) and the bottom surface of the slots (101). When the lower end of the plug post (201) moves toward the bottom of the slot (101), the elastic mechanism will generate elastic deformation.

3. The lower punch die of the magnetic mold for the ring magnetic product according to claim 2, characterized in that: The elastic mechanism comprises a spring (103), and the spring (103) is arranged between the lower end of the plug post (201) and the bottom surface of the slot (101).

4. The lower punch die of the magnetic mold for the ring magnetic product according to claim 3, characterized in that: The elastic mechanism further comprises a vertical rod (102), the vertical rod (102) being fixedly connected to the center of the bottom surface of the slot (101), and the upper end of the vertical rod (102) being movably inserted into the lower end of the plug post (201), and the spring (103) being sleeved on the vertical rod (102).

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