Upper and lower mold structure for improving surface magnetic performance of injection molding magnetic ring

Abstract

The utility model discloses an upper and lower mold structure for improving the surface magnetic performance of an injection molding magnetic ring, which comprises an upper mold body and a lower mold body, the upper mold body is provided with a feed port and a plurality of exhaust needles, the lower end of one exhaust needle is provided with a first flash groove, the lower mold body is provided with ejector pins respectively corresponding to the feed port and the exhaust needles, and the ejector pins are provided with a second flash groove. A second flash groove is formed in the upper end, corresponding to the first flash groove, of the ejector pin. According to the utility model, the lower end of the exhaust needle symmetrically arranged at the feed port is provided with the first flash groove, and the upper end of the ejector pin corresponding to the first flash groove is provided with the second flash groove, i.e., the flash groove is arranged at the weld mark, so that cold charge can be discharged out of the cavity, and the surface magnetic performance of the magnetic ring, especially the surface magnetic performance at the weld mark, is improved.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding magnetic ring technology, specifically relating to an upper and lower mold structure for improving the surface magnetic properties of injection molding magnetic rings. Background Technology

[0002] A magnetic ring is a ring-shaped magnetic conductor. Magnetic rings are commonly used anti-interference components in electronic circuits, effectively suppressing high-frequency noise, and are generally made of ferrite materials. Magnetic rings exhibit different impedance characteristics at different frequencies; generally, the impedance is very small at low frequencies, and the impedance increases sharply as the signal frequency increases.

[0003] Currently, most magnetic rings are injection molded. However, in practical applications, existing injection molds cannot effectively expel cold material from the cavity, resulting in a reduction in the surface magnetic properties of the magnetic rings, especially at the injection weld lines. Utility Model Content

[0004] The purpose of this invention is to provide an upper and lower mold structure for improving the surface magnetic properties of injection-molded magnetic rings, thereby solving the problems mentioned in the background art. The upper and lower mold structure provided by this invention for improving the surface magnetic properties of injection-molded magnetic rings has the characteristic of enhancing the surface magnetic properties at the weld line of the injection-molded magnetic ring.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an upper and lower mold structure for improving the magnetic properties of injection-molded magnetic rings, comprising an upper mold body and a lower mold body. The upper mold body is provided with a feed port and several venting pins, one of which has a first overflow groove at its lower end. The lower mold body is provided with ejector pins corresponding to the feed port and the venting pins, respectively, and the upper end of the ejector pins corresponding to the first overflow groove is provided with a second overflow groove.

[0006] Furthermore, in this utility model, the feed inlet and several exhaust pins are arranged in a circular array, and the exhaust pins with the first overflow groove are symmetrically arranged with the feed inlet.

[0007] Furthermore, in this utility model, the upper mold body is provided with an exhaust groove, and the exhaust pin is located in the exhaust groove.

[0008] Furthermore, in this utility model, the lower mold body is provided with an ejector pin groove, and the ejector pin is located in the ejector pin groove.

[0009] Furthermore, in this invention, both the upper mold body and the lower mold body are made of highly magnetically permeable materials.

[0010] Furthermore, in this invention, the depth of the first overflow trough is 4-6 mm.

[0011] Furthermore, in this invention, the depth of the second overflow trough is 8-12mm.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The present invention features a first overflow groove at the lower end of the venting pins symmetrically arranged at the feed inlet, and a second overflow groove at the upper end of the ejector pin corresponding to the first overflow groove. That is, an overflow groove is provided at the weld line, which can discharge cold material out of the cavity, thereby improving the surface magnetic properties of the magnetic ring, especially the surface magnetic properties at the weld line. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the upper mold body of this utility model.

[0015] Figure 2 This utility model Figure 1 Schematic diagram of the cross-sectional structure along the AA direction.

[0016] Figure 3 This utility model Figure 1 Schematic diagram of the cross-sectional structure along the BB direction.

[0017] Figure 4 This is a schematic diagram of the structure of the lower mold body of this utility model.

[0018] Figure 5 This utility model Figure 4 A schematic diagram of the cross-sectional structure along the CC direction.

[0019] In the diagram: 1. Upper mold body; 2. Inlet; 3. Venting groove; 4. Venting pin; 5. First overflow groove; 6. Lower mold body; 7. Ejector pin groove; 8. Ejector pin; 9. Second overflow groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1

[0022] Please see Figures 1-5The present invention provides the following technical solution: an upper and lower mold structure for improving the magnetic properties of injection molded magnetic rings, comprising an upper mold body 1 and a lower mold body 6. The upper mold body 1 is provided with a feed port 2 and three venting pins 4. The lower end of one of the venting pins 4 is provided with a first overflow groove 5. The feed port 2 and the three venting pins 4 are arranged in a circular array, and the venting pin 4 with the first overflow groove 5 is symmetrically arranged with the feed port 2. The lower mold body 6 is provided with ejector pins 8 corresponding to the feed port 2 and the venting pins 4 respectively. The upper end of the ejector pin 8 corresponding to the first overflow groove 5 is provided with a second overflow groove 9.

[0023] By adopting the above technical solution, the present invention has a first overflow groove 5 at the lower end of the venting pin 4 symmetrically arranged at the feed port 2, and a second overflow groove 9 at the upper end of the ejector pin 8 corresponding to the first overflow groove 5. That is, an overflow groove is set at the weld line, which can discharge cold material out of the cavity, thereby improving the surface magnetic performance of the magnetic ring, especially the surface magnetic performance at the weld line.

[0024] Specifically, the upper mold body 1 is provided with an exhaust groove 3, and the exhaust pin 4 is located in the exhaust groove 3.

[0025] The above technical solution is used to install the exhaust needle 4.

[0026] Specifically, the lower mold body 6 is provided with an ejector groove 7, and the ejector pin 8 is located in the ejector groove 7.

[0027] The above technical solution is used to install the ejector pin 8.

[0028] Specifically, both the upper mold body 1 and the lower mold body 6 are made of high magnetic permeability materials. These materials can be Ni50 alloy or DC530, etc., and in this embodiment, Ni50 alloy is preferred.

[0029] Specifically, the depth of the first overflow trough 5 is 4mm, and the depth of the second overflow trough 9 is 8mm.

[0030] Example 2

[0031] The difference between this embodiment and embodiment 1 is that, specifically, the depth of the first overflow trough 5 is 5mm, and the depth of the second overflow trough 9 is 10mm.

[0032] Example 3

[0033] The difference between this embodiment and embodiment 1 is that, specifically, the depth of the first overflow trough 5 is 6mm and the depth of the second overflow trough 9 is 12mm.

[0034] In summary, the present invention has a first overflow groove 5 at the lower end of the venting pin 4 symmetrically arranged at the feed inlet 2, and a second overflow groove 9 at the upper end of the ejector pin 8 corresponding to the first overflow groove 5. That is, an overflow groove is set at the weld line, which can discharge cold material out of the cavity, thereby improving the surface magnetic properties of the magnetic ring, especially the surface magnetic properties at the weld line.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold structure for improving the surface magnetic properties of injection-molded magnetic rings, characterized in that: It includes an upper mold body and a lower mold body. The upper mold body is provided with a feed port and several venting pins. The lower end of one of the venting pins is provided with a first overflow groove. The lower mold body is provided with ejector pins corresponding to the feed port and the venting pins respectively. The upper end of the ejector pin corresponding to the first overflow groove is provided with a second overflow groove.

2. The upper and lower mold structure for improving the surface magnetic properties of injection-molded magnetic rings according to claim 1, characterized in that: The feed inlet and several exhaust pins are arranged in a circular array, and the exhaust pins with the first overflow groove are symmetrically arranged with the feed inlet.

3. The upper and lower mold structure for improving the surface magnetic properties of injection-molded magnetic rings according to claim 1, characterized in that: The upper mold body is provided with an exhaust groove, and the exhaust pin is located in the exhaust groove.

4. The upper and lower mold structure for improving the surface magnetic properties of injection-molded magnetic rings according to claim 1, characterized in that: The lower mold body is provided with an ejector pin groove, and the ejector pin is located in the ejector pin groove.

5. The upper and lower mold structure for improving the surface magnetic properties of injection-molded magnetic rings according to claim 1, characterized in that: Both the upper and lower mold bodies are made of highly magnetically permeable materials.

6. The upper and lower mold structure for improving the surface magnetic properties of injection-molded magnetic rings according to claim 1, characterized in that: The depth of the first overflow trough is 4-6 mm.

7. The upper and lower mold structure for improving the surface magnetic properties of injection-molded magnetic rings according to claim 1, characterized in that: The depth of the second overflow trough is 8-12mm.

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