Extrusion die for profiled bonded permanent magnet ferrite

Abstract

This invention discloses an extrusion mold for irregularly shaped bonded permanent magnet ferrite, comprising a feeding template, a transition template, and an discharge template. The feeding template has a first feeding cavity; the transition template has multiple transition cavities, and a limiting post protrudes forward from the center of the transition template; a mold core is installed within the mounting cavity, and the mold core has an irregularly shaped forming cavity, which encloses an irregularly shaped portion. By designing the first feeding cavity as a cone shape, and with the inner diameter of the first feeding cavity decreasing sequentially from back to front, the material fills the cavity more completely during feeding. Furthermore, the limiting post extends into the second feeding cavity, and the front end of the limiting post abuts against the rear end of the irregularly shaped portion. The limiting post also occupies space in the second feeding cavity and avoids the irregularly shaped forming cavity, making it easier for the material to fill the second feeding cavity completely and enter the irregularly shaped forming cavity in a fully filled state, resulting in a uniform material in the formed irregularly shaped magnetic strip.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to an extrusion mold for irregularly shaped bonded permanent magnet ferrite. Background Technology

[0002] Permanent magnet ferrite is a fundamental functional material used in the electronics industry. It is manufactured using ceramic processing methods from SrO or BaO and ferric oxide as raw materials. As an important component of magnetic materials, it plays a vital role in the electronics, information technology, motorcycle, power tool, and automotive industries. Permanent magnet ferrite materials are functional materials that generate magnetic fields.

[0003] In existing technologies, permanent magnet ferrites are typically obtained using a dry powder pressing process. Compared to wet pressing, dry pressing presents challenges due to the bulk nature of the powder, making it more difficult to process and shape. Wet pressing, on the other hand, is mostly achieved through extrusion. However, the material is not in a liquid state during extrusion, resulting in poor flowability and incomplete filling of the forming cavity. This can lead to uneven forming and defects in irregularly shaped magnetic strips. Therefore, it is necessary to improve existing extrusion dies for bonded permanent magnet ferrites. Summary of the Invention

[0004] In view of this, the present invention addresses the deficiencies of the prior art, and its main objective is to provide an extrusion mold for irregularly shaped bonded permanent magnet ferrite, which can effectively solve the problems of unevenness and defects in localized areas of irregularly shaped magnetic strips formed by existing extrusion molds for bonded permanent magnet ferrite.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An extrusion die for irregularly shaped bonded permanent magnet ferrite includes an infeed die, a transition die, and an outlet die. The infeed die has a first infeed cavity, which is conical in shape and has an inner diameter decreasing from back to front. The transition die is assembled or detachably mounted on the infeed die and has multiple transition cavities arranged around its center. All transition cavities are connected to the first infeed cavity. A limited protrusion is formed at the center of the transition die. The positioning post has its rear end face partially blocking the opening of each transition cavity; the discharge template is assembled or detachably installed on the transition template, the discharge template has an installation cavity and a second feeding cavity, the installation cavity is connected to the second feeding cavity, the installation cavity has a mold core installed in the installation cavity, the mold core has a shaped forming cavity, the shaped forming cavity surrounds and forms a shaped part, the second feeding cavity is connected to multiple transition cavities, the aforementioned positioning post extends into the second feeding cavity, and the front end face of the aforementioned positioning post abuts against the rear end face of the shaped part.

[0007] As a preferred embodiment, the input ends of the plurality of transition cavities all extend inward to form interference portions, and each interference portion partially blocks the opening of the first feed cavity.

[0008] As a preferred embodiment, the inner diameter of the mounting cavity is larger than the inner diameter of the second feeding cavity, and the cross section formed by the mounting cavity and the second feeding cavity together is T-shaped.

[0009] As a preferred embodiment, the surface of the transition template is fitted with a silicone sleeve, which has a certain deformation capacity. When the feeding template, transition template and discharge template are assembled, they can be more compact, and the stress on the three can be effectively reduced, thus extending their service life.

[0010] As a preferred embodiment, the limiting post includes a main body and a buffer part. The main body extends forward from the center of the transition template, and the buffer part is located at the front end of the main body. The buffer part is made of silicone and can provide a buffering effect when the front end face of the limiting post abuts against the rear end face of the irregular part, thereby reducing the force on the irregular part, preventing damage to the discharge template, and extending its service life.

[0011] As a preferred embodiment, a screw hole is provided on the front end face of the main body, and the buffer part has a fixed end that is screwed into the screw hole. This design makes the fit between the buffer part and the main body more secure and reliable.

[0012] As a preferred embodiment, the feeding template has a first positioning hole, the discharging template has a second positioning hole, and the transition template has a first positioning post and a second positioning post protruding from it. The first positioning post is inserted into the first positioning hole for positioning, and the second positioning post is inserted into the second positioning hole for positioning, so that the assembly of the feeding template, the transition template and the discharging template is more precise.

[0013] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0014] By designing the first feeding chamber as a cone shape, and with the inner diameter of the first feeding chamber decreasing from back to front, the material fills the chamber more and more fully during the feeding process. In addition, the limiting post extends into the second feeding chamber, and the front end of the limiting post abuts against the rear end of the irregular part. While playing a limiting role, the limiting post also occupies the space of the second feeding chamber and avoids the irregular forming cavity, making it easier for the material to fill the second feeding chamber and enter the irregular forming cavity in a completely filled state. This results in the irregular magnetic strip being formed with uniform material and without the problem of defects in local areas.

[0015] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a preferred embodiment of the present invention in its assembled state;

[0017] Figure 2 This is a cross-sectional view of a preferred embodiment of the present invention in an exploded state;

[0018] Figure 3 This is a schematic diagram of the feeding template in a preferred embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the transition template in a preferred embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure of the discharge template in a preferred embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the irregularly shaped magnetic strip.

[0022] Explanation of reference numerals in the attached diagram:

[0023] 10. Feeding template 11. First feeding chamber

[0024] 12. First positioning hole 20. Transition template

[0025] 21. Transition cavity 22. Limiting post

[0026] 221. Main body 2211. Screw hole

[0027] 222, Buffer section; 2221, Fixed end

[0028] 23. Interference section; 24. First positioning post

[0029] 25. Second positioning post; 31. Mounting cavity

[0030] 32. Second feed chamber; 33. Second positioning hole

[0031] 40. Silicone sleeve; 50. Mold core

[0032] 51. Irregularly shaped cavity 52. ​​Irregularly shaped part. Detailed Implementation

[0033] Please refer to Figures 1 to 6 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, including a feeding template 10, a transition template 20, and a discharging template 30.

[0034] The feeding template 10 has a first feeding cavity 11, which is conical and has an inner diameter that decreases from back to front. In this embodiment, the feeding template 10 also has a first positioning hole 12.

[0035] The transition template 20 is assembled or detachably mounted on the feed template 10. The transition template 20 has multiple transition cavities 21 arranged around its center, all of which connect to the first feed cavity 11. A limiting post 22 protrudes forward from the center of the transition template 21, with its rear end partially blocking the opening of each transition cavity 21. This design causes some material to be obstructed when passing through the output end of the transition cavity 21, resulting in greater extrusion force and a faster extrusion rate for the unobstructed portion, thus making it easier for the material to enter the depth of the second feed cavity. In this embodiment, the input ends of each of the multiple transition cavities 21 extend inward to form interference portions 23, each of which partially blocks the opening of the first feed cavity 11. This design causes some material to be obstructed when entering the transition cavity 21 from the output end of the first feed cavity 11, resulting in greater extrusion force and a faster extrusion rate for the unobstructed portion. Additionally, the surface of the transition template 20 is coated with silicon. The rubber sleeve 40, or silicone sleeve 40, has a certain deformation capacity, allowing for a more compact assembly of the feeding template 10, transition template 20, and discharge template 30, effectively reducing the stress on all three and extending their service life. Furthermore, the limiting post 22 includes a main body 221 and a buffer part 222. The main body 221 extends forward from the center of the transition template 20, and the buffer part 222 is located at the front end of the main body 221. The buffer part 222 is made of silicone and can abut against the rear end face of the irregular part 52. When touched, it provides a buffering effect, reduces the force on the irregular part 52, prevents damage to the discharge template 30, and extends its service life; the front end face of the main body 221 is provided with a screw hole 2211, and the buffer part 222 has a fixed end 2221, which is screwed and fixed in the screw hole 2211. This design makes the fit between the buffer part 222 and the main body 221 more firm and reliable; and the transition template 20 is provided with a first positioning post 24 and a second positioning post 25, and the first positioning post 24 is inserted into the first positioning hole 12 for positioning.

[0036] The discharge template 30 is assembled or detachably mounted on the transition template 20. The discharge template 30 has an installation cavity 31 and a second feeding cavity 32. The installation cavity 31 is connected to the second feeding cavity 32. A mold core 50 is installed in the installation cavity 31. The mold core 50 has a shaped cavity 51. The shaped cavity 51 surrounds a shaped part 52. The second feeding cavity 32 is connected to multiple transition cavities 21. The aforementioned limiting post 22 extends into the second feeding cavity 32, and the front end face of the aforementioned limiting post 22 abuts against the rear end face of the shaped part 52. In this embodiment, the inner diameter of the installation cavity 31 is larger than the inner diameter of the second feeding cavity 32. The cross section formed by the installation cavity 31 and the second feeding cavity 32 is T-shaped. The discharge template 30 has a second positioning hole 33. The second positioning post 25 is inserted into the second positioning hole 33 for positioning.

[0037] The working process of this embodiment is described in detail below:

[0038] First, the material enters the input end of the first feeding chamber 11. Since the inner diameter of the first feeding chamber 11 decreases from back to front, the material is continuously compressed as it passes through the first feeding chamber 11, and the force it receives also increases. Next, the material reaches the output end of the first feeding chamber 11 and is interfered with by the interference part 23, causing some material to be blocked from passing through. This allows the unblocked material to have a greater extrusion force and obtain a faster extrusion rate. After entering the transition chamber 21, since the total volume of the multiple transition chambers 21 is much smaller than the first feeding chamber 11, and the material obtains a faster extrusion rate and a greater extrusion force, the material enters the transition chamber 21. The mutual collision of the material causes the material to be further compressed in the transition chamber 21 and completely fill the transition chamber 21. Then, when the material enters the second feeding chamber 32, it is interfered with by the rear end face of the limiting post 22, obtaining a faster extrusion rate and a greater extrusion force, achieving complete filling of the second feeding chamber 32. Finally, after the material enters the irregular forming chamber 51, it is extruded to form an irregular magnetic strip 60.

[0039] The key design feature of this invention is that by designing the first feeding chamber as a cone shape, and with the inner diameter of the first feeding chamber decreasing from back to front, the material fills the chamber more and more fully during the feeding process. In addition, a limiting post extends into the second feeding chamber, and the front end of the limiting post abuts against the rear end of the irregular part. While playing a limiting role, the limiting post also occupies the space of the second feeding chamber and avoids the irregular forming cavity, making it easier for the material to fill the second feeding chamber and enter the irregular forming cavity in a completely filled state. This results in the irregular magnetic strip being formed with uniform material and without the problem of defects in local areas.

[0040] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An extrusion die for irregularly shaped bonded permanent magnet ferrite, characterized in that: It includes a feeding template, a transition template, and a discharging template. The feeding template has a first feeding cavity, which is conical in shape, and its inner diameter decreases from back to front. The transition template is assembled or detachably mounted on the feeding template. The transition template has multiple transition cavities arranged around its center, all connected to the first feeding cavity. The input ends of each transition cavity extend inward to form interference portions, each partially blocking the opening of the first feeding cavity. A limiting post protrudes forward from the center of the transition template. The rear end face partially blocks the opening of each transition cavity; the discharge template can be assembled or detachably installed on the transition template, the discharge template has an installation cavity and a second feeding cavity, the installation cavity is connected to the second feeding cavity, and the inner diameter of the installation cavity is larger than the inner diameter of the second feeding cavity, the cross section formed by the installation cavity and the second feeding cavity is T-shaped, the mold core is installed in the installation cavity, the mold core has a special-shaped forming cavity, the special-shaped forming cavity surrounds the special-shaped part, the second feeding cavity is connected to multiple transition cavities, the aforementioned limiting post extends into the second feeding cavity, and the front end face of the aforementioned limiting post abuts against the rear end face of the special-shaped part.

2. The extrusion die for irregularly shaped bonded permanent magnet ferrite according to claim 1, characterized in that: The surface of the transition template is fitted with a silicone sleeve.

3. The extrusion die for irregularly shaped bonded permanent magnet ferrite according to claim 1, characterized in that: The limiting post includes a main body and a buffer part. The main body extends forward from the center of the transition template, and the buffer part is located at the front end of the main body.

4. The extrusion die for irregularly shaped bonded permanent magnet ferrite according to claim 3, characterized in that: A screw hole is provided on the front end face of the main body, and the buffer part has a fixed end, which is screwed into the screw hole.

5. The extrusion die for irregularly shaped bonded permanent magnet ferrite according to claim 1, characterized in that: The feeding template has a first positioning hole, the discharging template has a second positioning hole, and the transition template has a first positioning post and a second positioning post protruding from it. The first positioning post is inserted into the first positioning hole for positioning, and the second positioning post is inserted into the second positioning hole for positioning.

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