High-performance ferrite wet pressing mold

Abstract

A high-performance ferrite wet pressing die comprises an upper die fixing plate, an upper die, a cavity, a runner plate, a lower die connecting plate and a lower die supporting plate, a combined runner is arranged in the runner plate, and a feeding hole is formed in one end of the runner plate and communicated with the combined runner; the combined runner comprises a main runner, one end of the main runner is communicated with the feeding hole, the other end of the main runner is communicated with the middle of a first-stage runner, and the first-stage runner is arranged above the main runner; the left end and the right end of the first-stage flow channel are communicated with the middle of the second-stage flow channel, the second-stage flow channel is arranged above the first-stage flow channel, and the second-stage flow channel is perpendicular to the first flow channel; the two ends of the second-stage flow channel are connected with the middle of the third-stage flow channel, the left end and the right end of the third-stage flow channel communicate with the adjacent lower die pressing holes correspondingly, the third-stage flow channel is arranged below the second-stage flow channel, and the third-stage flow channel is perpendicular to the second-stage flow channel. And the two ends of the third-stage runner are respectively communicated with the lower ends of the adjacent lower die pressing holes.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and in particular to a high-performance ferrite wet pressing mold. Background Art

[0002] Ferrite is a commonly used component in electronic circuits, which is pressed from ferrite materials. In order to obtain ferrite with better magnetic properties, magnetic orientation is carried out simultaneously during the pressing process. The raw material used in the wet pressing method is slurry, which is more beneficial for magnetic orientation during the forming process. Therefore, the wet pressing method is widely used.

[0003] The forming process refers to injecting slurry with a certain water content into the mold cavity under the driving force of a pump, and under the action of an external magnetization magnetic field, gradually pressing it into a blank with a certain density through pressure filtration dehydration and orientation along the magnetic field direction. In this process, the mold structure design is the key. The quality of mold design and production directly determines the efficiency of the blank and the qualification rate of subsequent processes.

[0004] The existing forming mold includes an upper template, a cavity plate, a runner template, and a lower mold, which are composed of a lower mold connecting plate, a lower mold support plate, etc. Among them, 2 groups of channels for injecting materials are opened on the injection plate, including a horizontal injection through hole opened on the side of the injection template and a plurality of longitudinal injection holes corresponding to the number of each cavity opened longitudinally on the cavity plate. At the upper end of these longitudinal injection holes, injection holes are horizontally opened to lead to each cavity. When injecting materials, it is necessary to pump the pressure slurry into the injection through hole on the side of the injection template, and then it is divided into each longitudinal injection hole and enters each cavity through the injection hole. In practice, we found that due to the long injection flow path leading to each cavity, many unbalanced turning angles, and the slurry being more viscous, the flow resistance is greater, the flow path is longer, and the pressure loss is large. Therefore, the pressure entering each cavity is not equal, and the amount of slurry will be different, resulting in poor product consistency of the ferrite green body formed by pressing, and product defects such as blank density, moisture content, thickness dispersion of the same mold, and crushing force difference of the sintered batch. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides the following solutions:

[0006] A high-performance ferrite wet pressing die, comprising an upper die fixing plate, an upper die, a cavity, a runner plate, a lower die connecting plate and a lower die supporting plate. The upper die is fixedly arranged at the bottom of the upper die fixing plate, the lower die connecting plate is fixedly arranged at the top of the lower die supporting plate, the cavity is arranged above the runner plate, and the runner plate and the cavity are arranged with lower die pressing holes. A cylindrical lower die is fixedly arranged at the top of the lower die connecting plate corresponding to the lower die pressing holes. A combined runner is arranged in the runner plate. One end of the runner plate is provided with a feed hole, and the feed hole is communicated with the combined runner. The combined runner includes a main runner, one end of the main runner is communicated with the feed hole, and the other end is communicated with the middle of the first-stage runner, and the first-stage runner is arranged above the main runner. Both the left and right ends of the first-stage runner are communicated with the middle of the second-stage runner. The second-stage runner is arranged above the first-stage runner, and the second-stage runner is vertically arranged with the first-stage runner. Both ends of the second-stage runner are connected to the middle of the third-stage runner. The left and right ends of the third-stage runner are respectively communicated with the adjacent lower die pressing holes. The third-stage runner is arranged below the second-stage runner, and the third-stage runner is vertically arranged with the second-stage runner. Both ends of the third-stage runner are respectively communicated with the lower ends of the adjacent lower die pressing holes.

[0007] Further, upper die drainage channels are arranged on both sides of the lower die pressing holes in the upper die. The bottom end of the upper die drainage channel is communicated with the bottom surface of the upper die, and the top end of the upper die drainage channel is communicated with the top surface of the upper die. A drainage groove communicated with the upper die drainage channel is arranged on the top surface of the upper die, and a drainage hole communicated with the drainage groove is arranged on the side wall of the upper die fixing plate.

[0008] Further, the main runner is communicated with the first-stage runner, the first-stage runner is communicated with the second-stage runner, and the second-stage runner is communicated with the third-stage runner through vertically arranged connecting pipes.

[0009] Further, the cross-sectional shapes of the first-stage runner, the second-stage runner and the third-stage runner are all trapezoids with a wider bottom and a narrower top.

[0010] Further, the cross-section of the main runner is circular.

[0011] Further, the ends of the first-stage runner, the second-stage runner and the third-stage runner are all semi-circular structures.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. The multi-stage runners are distributed up and down. During the process of the liquid material flowing up and down in the runners, a turning and stirring effect is generated, avoiding the problem of the liquid material solidifying in the runners in traditional dies.

[0014] 2. The upper die and the upper die fixing plate are provided with a drainage structure, and the excess moisture during the pressing process can be centrally discharged by the drainage structure.

[0015] 3. Through the balanced design of the flow channels, during the pressing production, the pressures in each cavity are made equal, the slurry amounts are equivalent, the flow distances are equal and balanced, and the flow velocity is increased to change the problem that the slurry is prone to solidify and adhere in the closed holes of the flow channels, thereby improving the consistency of each part of the ferrite blank and greatly improving the product defects such as low density, high moisture content, thickness dispersion of the same mold, and poor crushing force of the sintered blank. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present invention;

[0017] Figure 2 It is a schematic diagram of the flow channel distribution.

[0018] 1. Upper die fixing plate; 2. Upper die; 3. Cavity; 4. Runner plate; 5. Lower die connecting plate; 6. Lower die supporting plate; 7. Lower die; 8. Upper die drainage channel; 9. Drainage groove; 10. Drainage hole; 11. Main runner; 12. First-level runner; 13. Second-level runner; 14. Third-level runner. Detailed Embodiment

[0019] The following further elaborates on the present invention in conjunction with specific embodiments.

[0020] Embodiment 1:

[0021] As Figure 1 - Figure 2 shown, a high-performance ferrite wet pressing mold includes an upper die fixing plate 1, an upper die 2, a cavity 3, a runner plate 4, a lower die connecting plate 5 and a lower die supporting plate 6. The upper die 2 is fixedly arranged at the bottom of the upper die fixing plate 1, the lower die connecting plate 5 is fixedly arranged at the top of the lower die supporting plate 6, the cavity 3 is arranged above the runner plate 4, the runner plate 4 and the cavity 3 are arranged with lower die pressing holes, and a cylindrical lower die 7 is fixedly arranged at the top of the lower die connecting plate 6 corresponding to the lower die pressing holes. A combined runner is arranged in the runner plate 4. One end of the runner plate 4 is provided with a feeding hole, and the feeding hole is communicated with the combined runner. The combined runner includes a main runner 11. One end of the main runner 11 is communicated with the feeding hole, and the other end is communicated with the middle of the first-level runner 12, and the first-level runner 12 is arranged above the main runner 11. Both the left and right ends of the first-level runner 12 are communicated with the middle of the second-level runner 13. The second-level runner 13 is arranged above the first-level runner 12, and the second-level runner 13 is vertically arranged with the first-level runner 12. Both ends of the second-level runner 13 are connected to the middle of the third-level runner 14. The left and right ends of the third-level runner 14 are respectively communicated with the adjacent lower die pressing holes. The third-level runner 14 is arranged below the second-level runner 13, and the third-level runner 14 is vertically arranged with the second-level runner 13. Both ends of the third-level runner 14 are respectively communicated with the lower ends of the adjacent lower die pressing holes.

[0022] On both sides of the lower die pressing holes corresponding to the upper die 2, upper die drainage channels 8 are provided. The bottom end of the upper die drainage channels 8 is communicated with the bottom surface of the upper die 2, and the top end of the upper die drainage channels 8 is communicated with the top surface of the upper die 2. A drainage groove 9 communicated with the upper die drainage channels 8 is arranged on the top surface of the upper die 2, and a drainage hole 10 communicated with the drainage groove 9 is arranged on the side wall of the upper die fixing plate 1.

[0023] The main runner 11 is communicated with the first-stage runner 12, the first-stage runner 12 is communicated with the second-stage runner 13, and the second-stage runner 13 is communicated with the third-stage runner 14 through vertically arranged connecting pipes.

[0024] The cross-sectional shapes of the first-stage runner 12, the second-stage runner 13, and the third-stage runner 14 are all trapezoids with a wider bottom and a narrower top.

[0025] The cross-section of the main runner 11 is circular.

[0026] The ends of the first-stage runner 12, the second-stage runner 13, and the third-stage runner 14 are all semi-circular structures.

[0027] According to the number of lower die pressing holes arranged on the runner plate 4, the connection structures of the first-stage runner 12, the second-stage runner 13, and the third-stage runner 14 can be repeatedly arranged and combined to meet the connection requirements. For example, both ends of the third-stage runner 14 can continue to be communicated with the middle of the fourth-stage runner. The fourth-stage runner is located above the third-stage runner 14. Both ends of the fourth-stage runner continue to be communicated with the middle of the fifth-stage runner. The fifth-stage runner is located below the fourth-stage runner, and so on, extending continuously.

[0028] The working principle of the present utility model is as follows: The liquid material is injected into the runner from the injection hole. The liquid material passes through the main runner 11, the first-stage runner 12, the second-stage runner 13, and the third-stage runner 14 and enters the corresponding lower die pressing holes. The liquid material is injected above the lower die 7. During the injection process, the liquid material enters the first-stage runner 12 upward from the main runner 11. The liquid material in the first-stage runner 12 enters the second-stage runner 13 upward. The liquid material in the second-stage runner 13 enters the third-stage runner 14 downward. The liquid material in the third-stage runner 14 finally enters the lower die pressing holes. Through multiple up and down flows, the stirring effect of the liquid material is achieved, avoiding the problems that the liquid material solidifies in advance in the runner, affecting the pressing effect and blocking the runner.

[0029] When the injected liquid material reaches the required amount, the injection is stopped. At this time, the lower die 6 is pressed upward. Under the pressure generated between the lower die 6 and the upper die 2, the liquid material is pressed into shape. During the pressing process, the moisture pressed out from the liquid material is extruded out through the upper die drainage channels 8 into the drainage groove 9, and finally discharged from the drainage groove 9 into the drainage hole 10. Finally, the excess moisture is discharged from the drainage hole 10. In this way, one pressing of the ferrite is completed. After one pressing is completed, the lower die 7 is withdrawn, and the pressed ferrite is taken off, and the above work is repeated.

[0030] The utility model has multi-stage flow channels distributed up and down, and the liquid material is turned over and stirred in the process of flowing up and down in the flow channels, thereby avoiding the problem of solidification of the liquid material in the flow channels in traditional molds. The upper mold and the upper mold fixing plate are provided with drainage structures, and the excess water in the pressing process can be discharged centrally by the drainage structure. Through the balanced design of the flow channels, during the pressing production, the pressure of each cavity is equal and the amount of slurry is equivalent, the process distance is equal and balanced, and the flow rate is accelerated to change the problem of easy solidification and adhesion of the slurry in the closed hole of the flow channel, thereby improving the consistency of various parts of the ferrite blank, greatly improving the defects of the product such as low density of the blank, high water content, thickness dispersion in the same mold, and poor crushing force of the blank after sintering.

[0031] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many variations are possible. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A high-performance ferrite wet pressing die, comprising an upper die fixing plate, an upper die, a cavity, a runner plate, a lower die connecting plate and a lower die supporting plate. The upper die is fixedly arranged at the bottom of the upper die fixing plate, the lower die connecting plate is fixedly arranged at the top of the lower die supporting plate, the cavity is arranged above the runner plate, the runner plate and the cavity are arranged with lower die pressing holes, and a columnar lower die is fixedly arranged at the top of the lower die connecting plate corresponding to the lower die pressing holes. It is characterized in that: A combined flow channel is arranged in the flow channel plate. One end of the flow channel plate is provided with a feed hole, and the feed hole is communicated with the combined flow channel. The combined flow channel includes a main flow channel. One end of the main flow channel is communicated with the feed hole, and the other end is communicated with the middle of the first-stage flow channel. The first-stage flow channel is arranged above the main flow channel. The middle parts of the second-stage flow channels are communicated with both the left and right ends of the first-stage flow channel. The second-stage flow channels are arranged above the first-stage flow channel and are perpendicular to the first-stage flow channels. The middle parts of the third-stage flow channels are connected to both ends of the second-stage flow channels. The left and right ends of the third-stage flow channels are respectively communicated with the adjacent lower die pressing holes. The third-stage flow channels are arranged below the second-stage flow channels and are perpendicular to the second-stage flow channels. Both ends of the third-stage flow channels are respectively communicated with the lower ends of the adjacent lower die pressing holes.

2. The high-performance ferrite wet pressing die as described in claim 1, wherein: Upper die drainage channels are arranged on the left and right sides of the lower die pressing holes in the upper die. The bottom end of the upper die drainage channel is communicated with the bottom surface of the upper die, and the top end of the upper die drainage channel is communicated with the top surface of the upper die. A drainage groove communicated with the upper die drainage channel is arranged on the top surface of the upper die, and a drainage hole communicated with the drainage groove is arranged on the side wall of the upper die fixing plate.

3. The high-performance ferrite wet pressing die as described in claim 1, wherein: The main flow channel is communicated with the first-stage flow channel, the first-stage flow channel is communicated with the second-stage flow channel, and the second-stage flow channel is communicated with the third-stage flow channel through vertically arranged connecting pipes.

4. The high-performance ferrite wet pressing die as described in claim 1, wherein: The cross-sectional shapes of the first-stage flow channel, the second-stage flow channel, and the third-stage flow channel are all trapezoids with a wider bottom and a narrower top.

5. The high-performance ferrite wet pressing die according to claim 1, wherein: The cross-section of the main flow channel is circular.

6. The high-performance ferrite wet pressing die as described in claim 1, wherein: Both ends of the first-stage flow channel, the second-stage flow channel, and the third-stage flow channel are semi-circular structures.

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